48 results on '"Operational strategy"'
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2. Toward better pandemic governance and preparedness: South Korea’s whole-of-nation approach to COVID-19
- Author
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Shin Ae Hong
- Subjects
COVID-19 outbreak ,Public health response ,Health policy ,Governance ,Operational strategy ,Preparedness ,Public aspects of medicine ,RA1-1270 - Abstract
Abstract Background The profound impact of coronavirus disease (COVID-19) has led to an increased demand for sustainable pandemic governance practices. This study explored emerging hybrid governance practices that provide robust evidence on how to address the complex challenges of pandemics effectively. South Korea, which was severely affected by COVID-19, has implemented a novel governance approach using a whole-of-nation (WoN) model. This hybrid pandemic governance approach, which integrates both whole-of-government and whole-of-society approaches, has enabled synergistic and cohesive multi-sectoral coordination among all stakeholders (public authorities, private enterprises, and civil society) to address multifaceted challenges collectively and strengthen their resilience capacity. This study investigated South Korea’s WoN practices and their embedded context and identified key governance enablers facilitating this approach. Methods This study employed a case study design based on an extensive analysis of policy and program documents, drawing on South Korea’s publicly available data from January 1, 2020 to March 30, 2023. It assessed six system-level collaborative pandemic governance practices and key enablers, all of which were intended to fortify the country’s pandemic response. Results The primary areas of the country’s WoN governance practices for COVID-19 control were (i) whole-of-government policy-making and response, (ii) COVID-19 testing system, (iii) digital surveillance of COVID-19, (iv) COVID-19 triage and treatment system, (v) domestic vaccine production, and (vi) community engagement. Key governance enablers for implementing the WoN model were establishing a legal foundation, ensuring decisive and strong governance and leadership, increasing public investment, applying a whole-of-health approach with augmented investment in public health, enhancing crisis communication, and mobilizing local leaders and civil society organizations in the national public health response. Conclusions In exploring innovative approaches to pandemic governance for increased efficacy, responsiveness, and impact, the WoN approach emerged as highly relevant. This example of emerging practice allows policy-makers to re-evaluate their governance strategies and initiatives to improve multi-agency partnerships across the country in their pandemic-preparedness planning. more...
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- 2024
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Catalog
3. Toward better pandemic governance and preparedness: South Korea's whole-of-nation approach to COVID-19.
- Author
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Hong, Shin Ae
- Subjects
- *
COVID-19 pandemic , *ELECTRONIC surveillance , *COVID-19 , *COVID-19 treatment , *CRISIS communication - Abstract
Background: The profound impact of coronavirus disease (COVID-19) has led to an increased demand for sustainable pandemic governance practices. This study explored emerging hybrid governance practices that provide robust evidence on how to address the complex challenges of pandemics effectively. South Korea, which was severely affected by COVID-19, has implemented a novel governance approach using a whole-of-nation (WoN) model. This hybrid pandemic governance approach, which integrates both whole-of-government and whole-of-society approaches, has enabled synergistic and cohesive multi-sectoral coordination among all stakeholders (public authorities, private enterprises, and civil society) to address multifaceted challenges collectively and strengthen their resilience capacity. This study investigated South Korea's WoN practices and their embedded context and identified key governance enablers facilitating this approach. Methods: This study employed a case study design based on an extensive analysis of policy and program documents, drawing on South Korea's publicly available data from January 1, 2020 to March 30, 2023. It assessed six system-level collaborative pandemic governance practices and key enablers, all of which were intended to fortify the country's pandemic response. Results: The primary areas of the country's WoN governance practices for COVID-19 control were (i) whole-of-government policy-making and response, (ii) COVID-19 testing system, (iii) digital surveillance of COVID-19, (iv) COVID-19 triage and treatment system, (v) domestic vaccine production, and (vi) community engagement. Key governance enablers for implementing the WoN model were establishing a legal foundation, ensuring decisive and strong governance and leadership, increasing public investment, applying a whole-of-health approach with augmented investment in public health, enhancing crisis communication, and mobilizing local leaders and civil society organizations in the national public health response. Conclusions: In exploring innovative approaches to pandemic governance for increased efficacy, responsiveness, and impact, the WoN approach emerged as highly relevant. This example of emerging practice allows policy-makers to re-evaluate their governance strategies and initiatives to improve multi-agency partnerships across the country in their pandemic-preparedness planning. [ABSTRACT FROM AUTHOR] more...
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- 2024
- Full Text
- View/download PDF
4. Modellierung und Analyse textiler Fassaden mit vertikalem Wassertransport.
- Author
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Gschweng, Melanie, Eisenbarth, Christina, Haase, Walter, Sawodny, Oliver, and Böhm, Michael
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URBAN heat islands ,PARTIAL differential equations ,TALL buildings ,TRANSPORT equation ,DYNAMICAL systems - Abstract
Copyright of Automatisierungstechnik is the property of De Gruyter and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...
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- 2024
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5. Implementing operational strategy of closed-loop supply chain considering data intelligence level with an online platform
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Xigang Yuan, Xiaoqing Zhang, Fei Tang, Qiang Wei, and Dalin Zhang
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Operational strategy ,Intelligent connected products ,Data intelligence level ,Online platform ,Environmental sciences ,GE1-350 ,Technology - Abstract
At present, the manufacturer collaborates on selling and recycling through an online platform. We explores the mode selection of closed-loop supply chain (CLSC) under the reselling or agency modes in forward SC and under the delegated-recycling mode or agency-recycling mode in reverse SC considering data intelligence level with an online platform. The results show that both the retail price of intelligent connected products (ICPs) and the demand of new ICPs are positively correlated with data intelligence level of new ICPs. The recycling price of old ICPs is negatively relevant to data intelligence level of old ICPs. However, the recycling quantity of old ICPs is positively related to data intelligence level of old ICPs. Increasing data intelligence level of new ICPs is benefit to enterprises. Moreover, it is very unconventional that the demand of new ICPs is increasing when the retail price of new ICPs increases. In addition, the manufacturer can choose the optimal selling mode and recycling mode by setting the selling commission rate and the recycling commission rate. more...
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- 2024
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6. Risk Assessment Method for System‐of‐Systems Operations — A Case Study of Wildfire Fighting.
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Zimdahl, Rosanna and Franzén, Ludvig Knöös
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WILDFIRE prevention ,RISK assessment ,OPERATIONAL risk ,HAZARDS ,ACHIEVEMENT - Abstract
A SoS is a set of collaborating systems that act towards a common achievement. Risk assessment is important in the early stages of SoS operational development, both for mission objectives and to enable technology which is developed responsibly. The method considers risks that stems from both internal and external interactions which leads to losses for different kind of actors. The method has been applied to a fictional case study of wildfire fighting. The internal interactions are mostly communication between the CSs while external interactions represent dependencies of other systems as well as impacts on other systems. The outcome of the methodology is a network of connected hazards to be used for risk management and for high level SoS requirements. [ABSTRACT FROM AUTHOR] more...
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- 2024
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7. Disclosure of the internal transport phenomena in an air-cooled proton exchange membrane fuel cell — Part IV: The appearance of flooding in the anode with dry hydrogen input.
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Zhao, Yao, Hu, Xiaoyu, Ye, Kequan, Zhang, Hao, Wang, Sibo, Sui, Sheng, Pan, Ruixin, Hu, Mingruo, and Jiang, Fengjing
- Subjects
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PROTON exchange membrane fuel cells , *FUEL cells , *TRANSPORT theory , *SOLID oxide fuel cells , *ANODES , *COMPUTATIONAL fluid dynamics , *SPECIFIC gravity - Abstract
Liquid water is sometimes found exhausted from the anode exit of an air-cooled proton exchange membrane fuel cell (ACFC) even if dry hydrogen is input as fuel while its utilization rate is kept constant, i.e., having the forced convection of H 2 in the anode. The anode liquid water accumulation may block the hydrogen into the anode catalyst layer (CL). However, no research has been dedicated to how the ACFC anode flooding appears, extends and intensifies under different operating conditions. In this research, a computational fluid dynamics model of ACFC proves the existence of anode two-phase flow based on some air stoichiometry, operating current density and relative air humidity (ARH). The results show that when the current density is increased to a high level of 840 mA cm−2, even though the air stoichiometric ratio (ASR) is set as the medium level of 150, the water flooding can cover two-thirds of the anode interface; as both the ARH and the current density increase to high levels of 90% and 700 mA cm−2, heavy flooding appears across the entire anode interface and the average liquid saturation is beyond 7 × 10−2. Finally, incorporating ARH and current density as the independent parameters and ASR as the dependent parameter, a rough operational strategy for ACFCs is put forward for the first time to try to avoid internal low or high humidity to stabilize the performance. • The transport characteristics of the anode two-phase flow of an ACFC are analyzed. • Elevated air stoichiometry and air relative humidity exacerbate anode flooding. • Higher current density leads to the anode flooding due to more generated water. • A rough operational strategy for ACFCs is put forward. [ABSTRACT FROM AUTHOR] more...
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- 2024
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8. 考虑风险偏好的多主体虚拟电厂经济调度与 收益分配策略.
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郁海彬, 卢闻州, 唐亮, 张煜晨, 邹翔宇, 姜玉靓, and 刘嘉宝
- Abstract
Copyright of Integrated Intelligent Energy is the property of Editorial Department of Integrated Intelligent Energy and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...
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- 2024
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9. Improvements in Management Reporting by Utilizing the Laundry-Based Information Technology Systems and Financial Planning: Business Coaching in One of SMEs Located in DKI Jakarta
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Abdat, Faiz Amer, Widhaningrat, Sisdjiatmo K., Appolloni, Andrea, Series Editor, Caracciolo, Francesco, Series Editor, Ding, Zhuoqi, Series Editor, Gogas, Periklis, Series Editor, Huang, Gordon, Series Editor, Nartea, Gilbert, Series Editor, Ngo, Thanh, Series Editor, Striełkowski, Wadim, Series Editor, Hurriyati, Ratih, editor, Wibowo, Lili Adi, editor, Abdullah, Ade Gafar, editor, Sulastri, editor, Lisnawati, editor, and Murtadlo, Yusuf, editor more...
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- 2024
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10. The operation strategy of rural library in Chengdu under the background of rural revitalization
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Chen, Zefeng, Wu, Wei, Appolloni, Andrea, Series Editor, Caracciolo, Francesco, Series Editor, Ding, Zhuoqi, Series Editor, Gogas, Periklis, Series Editor, Huang, Gordon, Series Editor, Nartea, Gilbert, Series Editor, Ngo, Thanh, Series Editor, Striełkowski, Wadim, Series Editor, Moutinho, Luiz, editor, Flavian, Carlos, editor, Li, Rita Yi Man, editor, and Zhou, Qiwei, editor more...
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- 2024
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11. Operational Strategy of a DC Inverter Heat Pump System Considering PV Power Fluctuation and Demand-Side Load Characteristics.
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Li, Yilin, Lu, Yang, Sun, Jie, Wang, Tianhang, Zong, Shiji, Zhou, Tongyu, and Wang, Xin
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HEAT pumps ,PHOTOVOLTAIC power systems ,SUPPLY & demand ,HEATING load ,CONSTRUCTION equipment ,POWER resources - Abstract
With the increase in application of solar PV systems, it is of great significance to develop and investigate direct current (DC)-powered equipment in buildings with flexible operational strategies. A promising piece of building equipment integrated in PV-powered buildings, DC inverter heat pump systems often operate with strategies either focused on the power supply side or on the building demand side. In this regard, the aim of this study was to investigate the operational strategy of a DC inverter heat pump system for application in an office building with a PV power system. Firstly, the PV power fluctuation and demand-side load characteristics were analyzed. Then, a series of heat transfer and heat pump system models were developed. A reference building model was developed for simulating the performance of the system. A control logic of the DC inverter heat pump was proposed with a certain level of flexibility and capability considering both the characteristics of the PV power generation and the demand-side heating load. MATLAB/Simulink 2021 software was used for simulation. The simulation results show that the DC inverter heat pump is able to regulate its own power according to the change signal of the bus voltage such that the DC distribution network can achieve power balance and thus provide enough energy for a room. This study can provide a reference for developing flexible operational strategies for DC inverter heat pump systems. The proposed strategy can also help to improve the systems' performance when they are applied in buildings with distributed PV systems. [ABSTRACT FROM AUTHOR] more...
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- 2024
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12. Optimized operational strategy of a solar reactor for thermochemical hydrogen generation.
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Lampe, Jörg and Menz, Steffen
- Abstract
Hydrogen plays an important role in a sustainable future global energy system. An interesting technology for generating renewable hydrogen is splitting of water via concentrated solar power by thermochemical two-step redox cycles. This technology has a much higher potential solar-to-fuel efficiency compared to photovoltaics with subsequent electrolysis. Here we present new results on the optimization of the operational process strategy of a large-scale 250 kW pilot plant consisting of a fixed bed reactor using ceria as reactive material. The considered tuning parameters are chosen as essential process parameters: operation temperatures within the two steps, corresponding fluid flows, as well as switching times within the two steps. Design limitations of employed materials and components are taken into account within the optimization; thus, the obtained results can be validated in practice. For the optimization it is employed a complex physical system model with more than 3500 states, which has been validated before by two measurement campaigns. Regarding reduction temperatures between 1400–1700 ∘ C the maximum efficiency is determined with up to 5.6%, using optimal operational parameters within a temperature swing strategy. Additionally, some economic considerations are given. [ABSTRACT FROM AUTHOR] more...
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- 2024
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13. Research on operation strategy of new media platform for earthquake prevention and disaster reduction based on a survey of college student users: Take students of Inner Mongolia Technical College of Construction as an example
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Xiaoxia Liu, Zhen Xie, Xuanchao Zhou, Ying Liu, Lijian Shang, and Huiling Xu
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college students ,earthquake prevention and disaster reduction ,new media ,operational strategy ,Geology ,QE1-996.5 ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
In the era of user segmentation, college students are the backbone of the future, and their knowledge of earthquake prevention and disaster reduction plays an important role in improving the awareness of earthquake prevention and disaster reduction as well as emergency avoidance ability of the whole society. Therefore, how to attract attention and study of college students in the popularization process of earthquake prevention and disaster reduction, especially with the advent of the new media era, how to use the official new media platform to popularize the knowledge of earthquake prevention and disaster reduction to local college students, is an urgent problem to be solved by the earthquake departments. Based on online questionnaire survey, this study investigates the use of mobile phones and the demand for popular science services for earthquake prevention and disaster reduction among students in Inner Mongolia Technical College of Construction, with long use time, typical use scenarios and diversified mobile phone uses, college students mainly accept popular science knowledge for earthquake prevention and disaster reduction through new media platforms, prefer popular science works such as animation and short videos, desire to obtain earthquake knowledge related to application and foundation most, and show great differences in acceptance of existing popular science content for earthquakes in the market. In view of this, this paper mainly analyzes the operation strategy of four new media platforms:official Weibo, WeChat, Jinritoutiao and Douyin, from four aspects, such as release time limit, release form, release content and platform promotion, with a view to improving the effect of popular science dissemination on earthquake prevention and disaster reduction. more...
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- 2023
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14. Modelling and operation strategy approaches for on-site Hydrogen Refuelling Stations.
- Author
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Cardona, Pol, Costa-Castelló, Ramon, Roda, Vicente, Carroquino, Javier, Valiño, Luis, Ocampo-Martinez, Carlos, and Serra, Maria
- Subjects
- *
GREENHOUSE gases , *FUELING , *HYDROGEN production , *INTERSTITIAL hydrogen generation , *HYDROGEN , *HYDROGEN as fuel - Abstract
The number of Fuel Cell Electric Vehicles (FCEVs) in circulation has undergone a significant increase in recent years. This trend is foreseen to be stronger in the near future. In correlation with the FCEVs market increase, the hydrogen delivery infrastructure must be developed. With this aim, many countries have announced ambitious projects. For example, Spain has the objective of increasing the number of Hydrogen Refuelling Stations (HRS) with public access from three units in operation currently to about 150 by 2030. HRSs are complex systems with high variability in terms of layout design, size of components, operational strategy, hydrogen generation method or hydrogen generation location. This paper is focused on on-site HRS with electrolysis-based hydrogen production, which provides interesting advantages when renewable energy is utilized compared to off-site hydrogen production despite their complexity. To optimize HRS design and operation, a simulation model must be implemented. This paper describes a generic on-site HRS with electrolysis-based hydrogen production, a cascaded multi-tank storage system with multiple compressors, renewable energy sources, and multiple types of dispensing formats. A modelling approach of the layout is presented and tested with real-based parameters of an HRS currently under development, which is capable of producing 11.34 kg/h of green H 2 with irradiation at 1000 W/m2. For the operation, an operational strategy is proposed. The modelled system is tested through several simulations. A sensitivity analysis of the effects of hydrogen demand and day-ahead hydrogen production objective on emissions, demand satisfaction and variable costs is performed. Simulation results show how the operational strategy has achieved service up to 310 FCEVs refuelling events of heavy duty and light duty FCEVs, bringing the total H 2 sold up to almost 7200 H2kg in one month of winter. Additionally, considering variable costs of the energy from the utility grid, the model shows a profit in the range of 21–50 k€ for a daily demand of 60 H2kg/day and 100 H2kg/day, respectively. In terms of emissions, a year simulation with 60 H2kg/day of demand shows specific emissions in the production of H 2 in Spain of 6.26 kgCO2eq/H2kg, which represents a greenhouse gas emission intensity of 52.26 gCO2eq/H2MJ. • Modelling approach of hydrogen refuelling station with on-site hydrogen production. • Operational strategy with day-ahead scheduled grid-connected hydrogen production. • Finite-state machine online control of a multi-tank and multi-compressor plant. • Sensitivity analysis of hydrogen demand magnitude and frequency. • A trade-off between demand satisfaction, profits and emissions. [ABSTRACT FROM AUTHOR] more...
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- 2024
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15. Estrategia empresarial y financiera de los emprendimientos: un acercamiento al cantón La Maná.
- Author
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García Bravo, Mayra Elizabeth, Torres Briones, Rosa Marjorie, Reyes Armas, Rodrigo Arturo, and del Rocío Hurtado García, Ketty
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EXPLORATORY factor analysis ,BUSINESS planning ,HUMAN resources departments ,ENTREPRENEURSHIP ,ACQUISITION of data - Abstract
Copyright of Pacha: Revista de Estudios Contemporáneos del Sur Global is the property of PACHA REVISTA DE ESTUDIOS CONTEMPORANEOS DEL SUR GLOBAL and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...
- Published
- 2024
- Full Text
- View/download PDF
16. Connecting the Dots: A Comprehensive Modeling and Evaluation Approach to Assess the Performance and Robustness of Charging Networks for Battery Electric Trucks and Its Application to Germany.
- Author
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Balke, Georg, Zähringer, Maximilian, Schneider, Jakob, and Lienkamp, Markus
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ELECTRIC networks ,ELECTRIC trucks ,INFRASTRUCTURE (Economics) ,TRANSPORTATION planning ,ELECTRIC charge ,NETWORK performance ,ELECTRIC batteries - Abstract
The successful introduction of battery electric trucks heavily depends on public charging infrastructure. But even as the first trucks capable of long-haul transportation are being built, no coherent fast-charging networks are yet available. This paper presents a methodology for assessing fast charging networks for electric trucks in Germany from the literature. It aims to establish a quantitative understanding of the networks' performance and robustness to deviations from idealized system parameters and identify crucial charging sites from a transportation planning perspective. Additionally, the study explores the quantification of adaptation effects displayed by agents in response to charging site outages. To achieve these objectives, a comprehensive methodology incorporating infrastructure, vehicle and operational strategy modeling, simulation, and subsequent evaluation is presented. Factors such as charging station locations, C-rates, mandatory rest periods, and vehicle parameters are taken into account, along with the distribution of traffic according to publicly available data. The study aims to offer a comprehensive understanding of charging networks' performance and resilience. This will be applied in a case study on two proposed networks and newly created derivatives. The proposed network offers over 99% coverage for long-haul transport but leads to a time loss of approximately 7% under reference conditions. This study advances the understanding of the performance and resilience of proposed charging networks, providing a solid foundation for the design and implementation of robust and efficient charging infrastructure for electric trucks. [ABSTRACT FROM AUTHOR] more...
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- 2024
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17. 基于大学生用户调查的防震减灾 新媒体平台运营策略研究 −以内蒙古建筑职业技术学院学生为例.
- Author
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刘小霞, 谢 珍, 周煊超, 刘 颖, 尚立坚, and 徐慧玲
- Abstract
Copyright of Progress in Earthquake Sciences is the property of China Earthquake Administration, Institute of Geophysics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...
- Published
- 2023
- Full Text
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18. Supply Chain Management Analysis of Sport Obermeyer
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Dong, Yiran, Su, Zhaohua, Wan, Yutong, Yu, Xiaole, Appolloni, Andrea, Series Editor, Caracciolo, Francesco, Series Editor, Ding, Zhuoqi, Series Editor, Gogas, Periklis, Series Editor, Huang, Gordon, Series Editor, Nartea, Gilbert, Series Editor, Ngo, Thanh, Series Editor, Striełkowski, Wadim, Series Editor, Bhunia, Amalendu, editor, Ahmad, Rubi Binti, editor, and Zhu, Yifeng, editor more...
- Published
- 2023
- Full Text
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19. CONTEMPORARY CHALLENGES OF SUCCESSFUL STRATEGY
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Emzar Julakidze
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operational strategy ,continuous development ,focus on changes ,strategy ,Economics as a science ,HB71-74 - Abstract
A successful strategy is a well-defined long-term strategy, which leads the company to achieve its desired goals and along with it, predicting the expected slow changes in the environment and the opportunities created there. It also gives a chance to find a cost advantage. However, developing and implementing such a strategy in today's rapidly changing environment is associated with many challenges. Among them, one of the most important is the right choice of operational strategy and the compatibility of this strategy with the company's mission. However, if the mission is to tell the public about the company, what makes it similar to its competitors, the main challenge of the operations strategy is to distinguish the given company from competitors with the same mission. All operations, regardless of how correctly they are planned and controlled, always contain a certain potential for development, which does not require a radical change in the budget. It is the realization of such, seemingly insignificant, but numerous opportunities, in the final analysis, ensures the continuous development of the company's operational processes and systems, manufactured products and rendered services. Two important things happen at this time. The first is that all directions of the operational strategy, be it customer relationship management, measures to increase the company's productivity, or the design of innovations, are interrelated and, one might say, interdependent processes; Second, and more importantly, a key management challenge has shifted the planning of operational processes from a position of control to development. Unfortunately, in most national companies, there is no clear development strategy, let alone an operational strategy. And where a strategic development plan seems to exist, very little attention is paid to the challenges of the company's core operating function and to operational development in general. In order to find out what attention should be paid to operational development, we more than 100 managers of small and medium businesses were interviewed in Kutaisi and its surroundings. Analyzing the obtained results gave us the following picture: 36% of respondents have not even heard of a strategic development plan and, naturally, have no idea what operational strategy and operational development should mean; and of those who confirm that they are well aware of the importance of a strategic development plan, almost half (46% to be more precise) have not heard of such a need for the operational strategy of the main creator of such a plan. That is, in fact, 67% of the respondents have no idea even about the essence of operational strategy. It is even more problematic that 18% of the total number of respondents perceived "operative development" as a medical term. The Japanese call continuous development "Kaizen". It can be safely said that today "Kaizen" also represents a culture of successful company development. Although it refers to development in personal life, family and public activities, but when it comes to the company, "Kaizen" means continuous development with managers and hired staff. Shifting the emphasis to situational strategy indicates that not infrequently changes are so sudden that they overwhelm you, and focusing only on a pre-planned strategy does not guarantee success. Today, in fact, two main challenges of strategy formation face each other: focusing on anticipated changes and focusing on changes revealed over time. In our opinion, if today the strategy focused on expected changes, that is, pre-planned, still works well, tomorrow it can be said for sure that the balance will be tilted in favor of focusing on the changes revealed in the process of strategy implementation. more...
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- 2023
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20. Operational strategies to alleviate thermal impacts of the large-scale borehole heat exchanger array in Beijing Daxing Airport
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Yaqian Ren, Yanlong Kong, Yonghui Huang, Shu Bie, Zhonghe Pang, Jichao He, Wei Yi, Bin He, and Jiyang Wang
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Large borehole heat exchanger system ,Ground source heat pump ,Performance indicator ,Thermal anomaly ,Operational strategy ,Thermal interaction ,Renewable energy sources ,TJ807-830 ,Geology ,QE1-996.5 - Abstract
Abstract Large-scale ground source heat pump (GSHP) systems are increasingly used for space heating and cooling. In comparison with smaller ones, large GSHP systems are often coupled with much more borehole heat exchangers (BHEs). Because of the intense thermal interactions between BHEs, they are more susceptible to significant ground temperature changes. Meanwhile, they possess the advantage that their operational strategies can be applied with a high degree of freedom, which presents chances to alleviate intense thermal interactions. In this study, we used a new performance indicator to access the effectiveness of GSHP operational strategies on alleviating thermal anomalies. The Daxing Airport GSHP system, contains 10,497 BHEs and is the largest in the world; therefore, it was selected as the test case for performance enhancement through operational strategies. We established a 2D model to predict ground temperature changes during the 50-year operation of the BHEs. First, it was revealed that the most severe thermal anomalies in the study area mainly occurred both within and between the BHE arrays, which should be mitigated. To alleviate the thermal anomalies caused by the thermal interactions of BHEs, operational strategies were applied by adjusting the cooling/heating starting sequence, setting time-dependent thermal loads, and reallocating thermal loads according to the position of the BHEs. Our study demonstrates that only the operation strategy that adjusts the cooling/heating starting sequence is beneficial for different BHE layouts, while the operational strategy that reallocates the thermal loads depending on BHEs position may be only effective for specific BHE layouts. In addition, our new performance indicator can be used to evaluate the effectiveness of the operational strategies and determine the spacing of adjacent BHE arrays. Therefore, it benefits the operation management of BHE array and design of BHE layout, and further guarantees the sustainable operation of the GSHP system. more...
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- 2023
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21. Operational strategies to alleviate thermal impacts of the large-scale borehole heat exchanger array in Beijing Daxing Airport.
- Author
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Ren, Yaqian, Kong, Yanlong, Huang, Yonghui, Bie, Shu, Pang, Zhonghe, He, Jichao, Yi, Wei, He, Bin, and Wang, Jiyang
- Subjects
HEAT exchangers ,GROUND source heat pump systems ,EARTH temperature ,BOREHOLES - Abstract
Large-scale ground source heat pump (GSHP) systems are increasingly used for space heating and cooling. In comparison with smaller ones, large GSHP systems are often coupled with much more borehole heat exchangers (BHEs). Because of the intense thermal interactions between BHEs, they are more susceptible to significant ground temperature changes. Meanwhile, they possess the advantage that their operational strategies can be applied with a high degree of freedom, which presents chances to alleviate intense thermal interactions. In this study, we used a new performance indicator to access the effectiveness of GSHP operational strategies on alleviating thermal anomalies. The Daxing Airport GSHP system, contains 10,497 BHEs and is the largest in the world; therefore, it was selected as the test case for performance enhancement through operational strategies. We established a 2D model to predict ground temperature changes during the 50-year operation of the BHEs. First, it was revealed that the most severe thermal anomalies in the study area mainly occurred both within and between the BHE arrays, which should be mitigated. To alleviate the thermal anomalies caused by the thermal interactions of BHEs, operational strategies were applied by adjusting the cooling/heating starting sequence, setting time-dependent thermal loads, and reallocating thermal loads according to the position of the BHEs. Our study demonstrates that only the operation strategy that adjusts the cooling/heating starting sequence is beneficial for different BHE layouts, while the operational strategy that reallocates the thermal loads depending on BHEs position may be only effective for specific BHE layouts. In addition, our new performance indicator can be used to evaluate the effectiveness of the operational strategies and determine the spacing of adjacent BHE arrays. Therefore, it benefits the operation management of BHE array and design of BHE layout, and further guarantees the sustainable operation of the GSHP system. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
- Full Text
- View/download PDF
22. Operational Strategy of a DC Inverter Heat Pump System Considering PV Power Fluctuation and Demand-Side Load Characteristics
- Author
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Yilin Li, Yang Lu, Jie Sun, Tianhang Wang, Shiji Zong, Tongyu Zhou, and Xin Wang
- Subjects
operational strategy ,DC inverter heat pump ,PV power ,demand side ,Building construction ,TH1-9745 - Abstract
With the increase in application of solar PV systems, it is of great significance to develop and investigate direct current (DC)-powered equipment in buildings with flexible operational strategies. A promising piece of building equipment integrated in PV-powered buildings, DC inverter heat pump systems often operate with strategies either focused on the power supply side or on the building demand side. In this regard, the aim of this study was to investigate the operational strategy of a DC inverter heat pump system for application in an office building with a PV power system. Firstly, the PV power fluctuation and demand-side load characteristics were analyzed. Then, a series of heat transfer and heat pump system models were developed. A reference building model was developed for simulating the performance of the system. A control logic of the DC inverter heat pump was proposed with a certain level of flexibility and capability considering both the characteristics of the PV power generation and the demand-side heating load. MATLAB/Simulink 2021 software was used for simulation. The simulation results show that the DC inverter heat pump is able to regulate its own power according to the change signal of the bus voltage such that the DC distribution network can achieve power balance and thus provide enough energy for a room. This study can provide a reference for developing flexible operational strategies for DC inverter heat pump systems. The proposed strategy can also help to improve the systems’ performance when they are applied in buildings with distributed PV systems. more...
- Published
- 2024
- Full Text
- View/download PDF
23. Strengthening supply chain resilience during COVID‐19: A case study of JD.com.
- Author
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Shen, Zuojun Max and Sun, Yiqi
- Subjects
COVID-19 pandemic ,SUPPLY chains ,SUPPLY chain disruptions ,SUPPLY chain management ,SMART structures - Abstract
The coronavirus/SARS‐CoV‐2 (COVID‐19) outbreak has caused severe supply chain disruptions in practically all industries worldwide. Online e‐commerce platforms, which interact directly with various industries and service numerous consumers, have become remarkable interfaces to observe the impacts of the pandemic on supply chains. Using quantitative operational data obtained from JD.com https://www.jd.com., this study analyzes the impact of the pandemic on supply chain resilience, summarizes the challenging scenarios that retailing supply chains experienced in China, and presents the practical response of JD.com throughout the pandemic. To summarize, the pandemic caused exceptional demand and severe logistical disruptions in China, and JD.com has handled well its supply chain management in response based on its integrated supply chain structure and comprehensive intelligent platforms. In particular, the existing intelligent platforms and the delivery procedures were modified slightly but promptly to deal with specific disruptions. Moreover, the entire market scenario in China was effectively controlled through the joint efforts of multiple firms, the government, and the entire Chinese society. Our study provides an example of using practical operational indicators to analyze supply chain resilience, and suggests firms pay attention to operational flexibility and collaboration beyond supply chains to deal with a large‐scale supply chain disruption, such as the COVID‐19 outbreak. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
- Full Text
- View/download PDF
24. Optimization of operational strategies for industrial applications of solar-based green hydrogen.
- Author
-
Bak, Youngseok, Ryu, Hyuncheol, Choi, Gobong, Lee, Dongwoo, and Lee, Jong Min
- Subjects
- *
GREEN fuels , *RENEWABLE energy sources , *COST control , *ELECTROLYTIC cells , *ECONOMIC indicators - Abstract
Renewable-based green hydrogen is emerging as a viable solution for decarbonizing energy-intensive industries. However, the fluctuating and intermittent nature of renewable energy sources requires careful consideration of operational strategies to ensure the safe and economical use of green hydrogen in industrial applications. This study examines the influence of operational strategies for electrolyzers and downstream processes on the cost of solar-based green hydrogen. The results demonstrate that optimal operational strategies for electrolyzers significantly impact the sizes of batteries and electrolyzers, reducing the Levelized Cost of Hydrogen (LCOH) by an average of 5.3%. Case studies further demonstrate that decentralized end-user supply strategies and cooperation with downstream processes can reduce LCOH by up to 39.8% for fully distributed end-users and by 24.2% with the introduction of supply tolerance. Additionally, the study evaluates the impact of grid backup, revealing that grid utilization can reduce LCOH by 12.9% in Houston, underscoring the potential for further cost reductions through grid decarbonization. These findings highlight the importance of optimizing operational strategies to improve the economic performance and market viability of green hydrogen systems. • Analysis of operational strategies affect on the cost of solar-based green hydrogen. • A 6-hour minimum on-time for electrolyzers minimized LCOH by reducing shutdowns. • Decentralized end-users cut LCOH by 39.8%, mainly in areas with seasonal variation. • Grid backup cut LCOH by 13% in Houston, showing potential from grid decarbonization. [ABSTRACT FROM AUTHOR] more...
- Published
- 2025
- Full Text
- View/download PDF
25. Connecting the Dots: A Comprehensive Modeling and Evaluation Approach to Assess the Performance and Robustness of Charging Networks for Battery Electric Trucks and Its Application to Germany
- Author
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Georg Balke, Maximilian Zähringer, Jakob Schneider, and Markus Lienkamp
- Subjects
battery electric trucks ,charging network ,open data ,infrastructure optimization ,operational strategy ,green logistics ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 ,Transportation engineering ,TA1001-1280 - Abstract
The successful introduction of battery electric trucks heavily depends on public charging infrastructure. But even as the first trucks capable of long-haul transportation are being built, no coherent fast-charging networks are yet available. This paper presents a methodology for assessing fast charging networks for electric trucks in Germany from the literature. It aims to establish a quantitative understanding of the networks’ performance and robustness to deviations from idealized system parameters and identify crucial charging sites from a transportation planning perspective. Additionally, the study explores the quantification of adaptation effects displayed by agents in response to charging site outages. To achieve these objectives, a comprehensive methodology incorporating infrastructure, vehicle and operational strategy modeling, simulation, and subsequent evaluation is presented. Factors such as charging station locations, C-rates, mandatory rest periods, and vehicle parameters are taken into account, along with the distribution of traffic according to publicly available data. The study aims to offer a comprehensive understanding of charging networks’ performance and resilience. This will be applied in a case study on two proposed networks and newly created derivatives. The proposed network offers over 99% coverage for long-haul transport but leads to a time loss of approximately 7% under reference conditions. This study advances the understanding of the performance and resilience of proposed charging networks, providing a solid foundation for the design and implementation of robust and efficient charging infrastructure for electric trucks. more...
- Published
- 2024
- Full Text
- View/download PDF
26. 基于推拉理论的高校图书馆迎新活动影响因素分析及应对策略.
- Author
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姜 玲
- Abstract
Copyright of Journal of Academic Library & Information Science is the property of Anhui University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...
- Published
- 2023
27. Optimal operational planning for district heating coupled industrial energy systems considering participation models.
- Author
-
Kohne, Thomas, Piendl, Daniel, Theisinger, Lukas, and Weigold, Matthias
- Abstract
To accelerate the transition of the heating sector possibilities are discussed to make excess heat from industrial companies available for building supply via district heating systems (DHS). By coupling complex industrial energy systems (IES) with DHS the utilization of industrial waste heat, renewable energy sources as well as more efficient energy converters can be increased. In the transformation of DHS through an increasingly decentralized heat supply and the integration of prosumers, different pricing schemes are being discussed. To participate in DHS, IES must consider different participation models during their investment and operational planning. We present an optimization approach for the operational planning of IES focusing on the coupling to DHS. The modeling approach can adapt to different participation models within DHS such as contractual pricing, coordinated feed-in, and cooperative operation. The optimization yields the optimal operating decisions and cost. The results of an industrial use case shows that a higher utilization of waste heat and energy converters such as combined heat and power can be reached by coupling IES to DHS, but the cost and emission savings are highly dependent on the participation model of the DHS. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
- Full Text
- View/download PDF
28. Catholic Ownership, Physician Leadership and Operational Strategies: Evidence from German Hospitals.
- Author
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Sülz, Sandra, Kuntz, Ludwig, Müller, Helena Sophie, and Wittland, Michael
- Subjects
HEALTH facility administration ,LEADERSHIP ,PHYSICIANS - Abstract
Previous research has revealed that Catholic hospitals are more likely follow a strategy of horizontal diversification and maximization of the number of patients treated, whereas Protestant hospitals follow a strategy of horizontal specialization and focus on vertical differentiation. However, there is no empirical evidence pertaining to this mechanism. We conduct an empirical study in a German setting and argue that physician leadership mediates the relationship between ownership and operational strategies. The study includes the construction of a model combining data from a survey and publicly available information derived from the annual quality reports of German hospitals. Our results show that Catholic hospitals opt for leadership structures that ensure operational strategies in line with their general values, i.e., operational strategies of maximizing volume throughout the overall hospital. They prefer part-time positions for chief medical officers, as chief medical officers are identified to foster strategies of maximizing the overall number of patients treated. Hospital owners should be aware that the implementation of part-time and full-time leadership roles can help to support their strategies. Thus, our results provide insights into the relationship between leadership structures at the top of an organization, on the one hand, and strategic choices, on the other. [ABSTRACT FROM AUTHOR] more...
- Published
- 2022
- Full Text
- View/download PDF
29. Prospects for improving shipping companies' profit margins by quantifying operational strategies and market focus approach through AIS data.
- Author
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Peng, Wenhao and Bai, Xiwen
- Subjects
- *
PROFIT margins , *CORPORATE profits , *SHIPPING companies , *MARKETING strategy , *AUTOMATIC identification - Abstract
Liner shipping companies (LSCs) apply distinct operational strategies in order to improve efficiency. The relationship between various operational strategies and profitability, however, has not been systematically and empirically examined. This study innovatively extracts and quantifies eight commonly used operational strategy measures from Automatic Identification System (AIS) data, and investigates the relationship between LSCs' operational strategies and profitability. This relationship is further examined in light of market focus or non-focus approaches. Machine learning-based clustering methods use four of these operational strategy measures (market scope, market scope diversity, average voyage distance, and ship size diversity) in order to categorize LSCs as focused or non-focused. The results of this study show that focused LSCs tend to achieve higher level of profitability than do non-focused LSCs. Non-focused companies, on the other hand, can limit the interplay between operational strategies and profitability. More specifically, we find that two operational strategies (capacity allocation and service frequency) have a non-linear relationship to profitability, while speed choice and idle capacity ratio are linearly related to profitability. • Extract eight operational strategy measures of liner companies from AIS data. • Identify the market focus approach of liner companies. • Investigate the relationship between profit margin and operational strategies. • Investigate the impact of market focus approach on identified relationship. [ABSTRACT FROM AUTHOR] more...
- Published
- 2022
- Full Text
- View/download PDF
30. How Does the Reference Price Mechanism Affect Competition?
- Author
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Hao Li, Yang Qian, and Ting Peng
- Subjects
Operational strategy ,reference price ,free riding ,duopoly ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 - Abstract
This paper proposes an operational strategy based on the theory of transaction utility, aiming to mitigate the negative impact of customers’ free-riding behaviour. This operational strategy is named the reference price mechanism (RPM), in which the retailer gives a reference price that may be different from the retail price, and the customer’s purchase decision is affected by the reference price. Based on the Hotelling model, we develop a duopoly game by considering the free-riding cost to systematically discuss the effectiveness of the RPM. The results show that the brick-and-mortar/online retailer can benefit from implementing the RPM separately, vice versa. If both retailers implement the RPM, only the retailer with the higher reference price can attain more profits. In addition, there is a threshold of the free-riding cost that can affect whether the retailers implement the RPM. more...
- Published
- 2022
- Full Text
- View/download PDF
31. New Weapon Target Assignment Algorithms for Multiple Targets Using a Rotational Strategy and Clustering Approach
- Author
-
Ji-Eun Kim, Chang-Hun Lee, and Mun Yong Yi
- Subjects
Clustering ,decision support system ,kill probability ,multiple aerial targets ,operational strategy ,simulation ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 - Abstract
This paper proposes practical weapon target assignment (WTA) algorithms for a defense system to counter multiple targets concentrated within a narrow area, such as low-altitude rocket threats or drone swarms. Since the probability of kill (PK) is greatly affected by heading errors between launchers and targets in this type of engagement, WTA problems must first be formulated, considering heading error, to reflect more realistic engagement situations. Two WTA algorithms—a rotation-fixed strategy and a rotation strategy— are proposed based on this formulation. Moreover, we propose a method for determining launchers’ initial orientation angles, based on a clustering approach, to further improve the engagement performance of the two algorithms. Numerical simulations were performed to demonstrate the effectiveness of the proposed methods. more...
- Published
- 2022
- Full Text
- View/download PDF
32. Techno-economic analysis for the effects of electricity pricing system on the market competitiveness of cogeneration model
- Author
-
Yong Hoon Im and Young Jik Youn
- Subjects
Cogeneration system ,Relative primary energy savings ,Operational strategy ,Hybrid cogeneration system ,Heat pump ,Energy industries. Energy policy. Fuel trade ,HD9502-9502.5 - Abstract
In this study, the actual operation status of the cogeneration model was investigated to examine the difference between the theoretical evaluation and the field operation situation. The adequacy of the installed capacity of the cogeneration system was assessed by using in-house developed diagnostic analysis simulation tool, and the effects of operational strategy on securing operational cost benefit under the progressive electricity rate system was also examined with event-based operating characteristic analysis. The installed prime mover was found to be designed excessively by an average of 47%, and the relative primary energy savings showed a large deviation in the range of 3–22% for each case. As a result of analyzing the effect of the rapid expansion of renewable energy on the operational performance, it was found that when the renewable power distribution ratio was increased to 30%, the relative primary energy savings effect fell to less than 5%. As an alternative, a hybrid cogeneration model integrated with heat pump was proposed, and it was confirmed that it could have the effect of mitigating the effect of expanding renewable energy. more...
- Published
- 2023
- Full Text
- View/download PDF
33. Optimization and Performance Analysis of a Distributed Energy System Considering the Coordination of the Operational Strategy and the Fluctuation of Annual Hourly Load.
- Author
-
Quan, Xibin, Xie, Hao, Wang, Xinye, Zhang, Jubing, Wei, Jiayu, Zhang, Zhicong, and Liu, Meijing
- Subjects
MIXED integer linear programming ,DISTRIBUTION (Probability theory) ,ENERGY consumption of buildings ,ELECTRICAL load ,ELECTRIC power consumption ,FLUCTUATIONS (Physics) ,GAUSSIAN distribution ,ELECTRIC power distribution grids - Abstract
The operation strategies of a distributed energy system (DES) are usually proposed according to the electrical load (FEL) and the thermal load (FTL), which take the cooling/heating load or electric load as unique constraint conditions that result in a too high or too low equipment load rate. This paper proposes a new hybrid operation strategy (HOS) that takes the full utilization of natural gas and the minimization of power consumption from the power grid as constraints and coordinates the cooling/electricity ratio and heating/electricity ratio of buildings and equipment. In the optimization phase of a DES, an optimization method based on the discretization of the load is proposed to investigate the influence of the uncertainty of the load on the DES, which helps to avoid repeated load simulations and provides stronger adjustability by quoting the normal distribution function to obtain multiple sets of load data with different fluctuations. Further, a multi-objective optimization model combining the genetic algorithm (GA) and mixed integer linear programming algorithm (MILP) was established to find the optimal configuration of equipment capacities by comprehensively considering the annual total cost, carbon emissions, and energy efficiency of the DES. Finally, an office building example was used to validate the feasibility of the above theories and methods. Compared with the FEL and FTL, the HOS reduced the energy waste of the DES by 19.7% and 15.5%, respectively. Compared with using a typical daily load, using an annual hourly load to optimize the DES-HOS produced a better comprehensive performance and lower adverse impacts derived from load fluctuations. [ABSTRACT FROM AUTHOR] more...
- Published
- 2022
- Full Text
- View/download PDF
34. 文化事件视角下城市建筑展览的 角色、能动性与操作策略.
- Author
-
姚伟伟
- Subjects
CITIES & towns ,URBAN growth ,EXHIBITIONS ,PUBLIC spaces ,URBANIZATION ,CULTURAL activities - Abstract
Copyright of Public Art is the property of Shanghai Fine Arts Publisher Ltd. co. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...
- Published
- 2022
35. Adapting performance measurements in agile processes : A case study with insights into how performance measurements can be adapted and implemented to monitor and improve agile processes in software development
- Author
-
Hellberg, Emelie, Ngugen, Thien, Hellberg, Emelie, and Ngugen, Thien
- Abstract
Purpose – This study aims to explore the integration of performance measurements within agile processes. It seeks to understand how performance measurements can be adapted and implemented effectively to enhance predictability and control within these processes. Methodology – A qualitative research approach was employed, gathering data through interviews and documents. The research focused on a case study within a software development company known for its agile practices. Data collection involved semi-structured interviews with team members across various roles and a review of project documentation to gather insights on current practices and challenges. Findings – The study identified a gap in consistently applying performance measurements across different teams. While some teams successfully utilized measurements to track progress and forecast future performance, others struggled with integrating these measurements into their daily workflows. Key challenges included the variability in adopting agile practices and aligning performance measurements with actual team and organizational goals. Analysis – The analysis identified that certain performance measurements in the literature were used in practice. Furthermore, based on the empirical findings, the use of performance measurements to improve various aspects of agile processes was elaborated upon. Performance measurements can also be adapted and implemented through generalization and bottom-up considerations. Implications – This study's implications provide a framework for better integrating performance measurement in agile environments. Theoretically, it contributes to agile processes by highlighting the importance of adaptive performance measurement systems that align with the dynamic nature of agile projects. Conclusions – The study concludes that performance measurements consider predictability, productivity, and quality of development and production. To be effective in agile processes, performance measurement m more...
- Published
- 2024
36. Optimal operational strategy for a future electricity and hydrogen supply system in a residential area.
- Author
-
Xu, Xiao, Hu, Weihao, Liu, Wen, Zhang, Zhenyuan, Du, Yuefang, Chen, Zhe, and Abulanwar, Sayed
- Subjects
- *
RESIDENTIAL areas , *PHOTOVOLTAIC power systems , *SOLAR power plants , *OPERATING costs , *COST control - Abstract
This study introduces a novel framework of an electricity and hydrogen supply system integrating with a photovoltaic power station for a residential area. The non-residential parts including the power grid and non-residential vehicles are added to ensure power balance and bring benefits, respectively. The optimal operational strategy of the proposed framework with considering uncertainties is proposed. The objective function minimizes the expected operational cost (EOC) by reducing the imported electricity from the power grid and increasing exported electricity/hydrogen to non-residential vehicles. Additionally, the demand response program (DRP) is applied in the residential load to achieve operational cost reduction. The uncertainties are modeled via various scenarios by using scenario-based stochastic optimization method. Notably, existing research for similar frameworks both lacks the consideration of uncertainties and DRP, and fails to distinguish the residential and non-residential vehicles with different charging behaviors. The results indicate that 1) The feasibility of the proposed framework is validated which can ensure the power balance of the residential area and reduce the operational cost. 2) The EOC is reduced when considering DRP. • A novel framework of an electricity and hydrogen supply system for a residential area is proposed. • The operational strategy of the framework is proposed with considering the uncertainties. • Residential vehicles and non-residential vehicles are modeled separately. • The DRP is introduced to reduce the expected operational cost of the framework. [ABSTRACT FROM AUTHOR] more...
- Published
- 2022
- Full Text
- View/download PDF
37. Optimization and Performance Analysis of a Distributed Energy System Considering the Coordination of the Operational Strategy and the Fluctuation of Annual Hourly Load
- Author
-
Xibin Quan, Hao Xie, Xinye Wang, Jubing Zhang, Jiayu Wei, Zhicong Zhang, and Meijing Liu
- Subjects
distributed energy system ,load fluctuation ,optimization ,operational strategy ,Technology ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Biology (General) ,QH301-705.5 ,Physics ,QC1-999 ,Chemistry ,QD1-999 - Abstract
The operation strategies of a distributed energy system (DES) are usually proposed according to the electrical load (FEL) and the thermal load (FTL), which take the cooling/heating load or electric load as unique constraint conditions that result in a too high or too low equipment load rate. This paper proposes a new hybrid operation strategy (HOS) that takes the full utilization of natural gas and the minimization of power consumption from the power grid as constraints and coordinates the cooling/electricity ratio and heating/electricity ratio of buildings and equipment. In the optimization phase of a DES, an optimization method based on the discretization of the load is proposed to investigate the influence of the uncertainty of the load on the DES, which helps to avoid repeated load simulations and provides stronger adjustability by quoting the normal distribution function to obtain multiple sets of load data with different fluctuations. Further, a multi-objective optimization model combining the genetic algorithm (GA) and mixed integer linear programming algorithm (MILP) was established to find the optimal configuration of equipment capacities by comprehensively considering the annual total cost, carbon emissions, and energy efficiency of the DES. Finally, an office building example was used to validate the feasibility of the above theories and methods. Compared with the FEL and FTL, the HOS reduced the energy waste of the DES by 19.7% and 15.5%, respectively. Compared with using a typical daily load, using an annual hourly load to optimize the DES-HOS produced a better comprehensive performance and lower adverse impacts derived from load fluctuations. more...
- Published
- 2022
- Full Text
- View/download PDF
38. Multistakeholder Planning and Operational Strategy for Electric Vehicle Battery Swapping Stations
- Author
-
Jin Ma and William Infante
- Subjects
Control and Systems Engineering ,Computer Networks and Communications ,Computer science ,Electric-vehicle battery ,Electrical and Electronic Engineering ,Operational strategy ,Automotive engineering ,Computer Science Applications ,Information Systems - Published
- 2022
- Full Text
- View/download PDF
39. Modelling and operation strategy approaches for on-site hydrogen refuelling stations
- Author
-
Universitat Politècnica de Catalunya. Doctorat en Automàtica, Robòtica i Visió, Universitat Politècnica de Catalunya. Departament d'Enginyeria de Sistemes, Automàtica i Informàtica Industrial, Universitat Politècnica de Catalunya. SAC - Sistemes Avançats de Control, Cardona Rubio, Pol, Costa Castelló, Ramon, Roda, Vicente, Carroquino, Javier, Valiño Garcia, Luis, Ocampo-Martínez, Carlos, Serra, Maria, Universitat Politècnica de Catalunya. Doctorat en Automàtica, Robòtica i Visió, Universitat Politècnica de Catalunya. Departament d'Enginyeria de Sistemes, Automàtica i Informàtica Industrial, Universitat Politècnica de Catalunya. SAC - Sistemes Avançats de Control, Cardona Rubio, Pol, Costa Castelló, Ramon, Roda, Vicente, Carroquino, Javier, Valiño Garcia, Luis, Ocampo-Martínez, Carlos, and Serra, Maria more...
- Abstract
© 2023 The Author(s). Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC. This is an open access article under the CC BY-NCND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)., The number of Fuel Cell Electric Vehicles (FCEVs) in circulation has undergone a significant increase in recent years. This trend is foreseen to be stronger in the near future. In correlation with the FCEVs market increase, the hydrogen delivery infrastructure must be developed. With this aim, many countries have announced ambitious projects. For example, Spain has the objective of increasing the number of Hydrogen Refuelling Stations (HRS) with public access from three units in operation currently to about 150 by 2030. HRSs are complex systems with high variability in terms of layout design, size of components, operational strategy, hydrogen generation method or hydrogen generation location. This paper is focused on on-site HRS with electrolysis-based hydrogen production, which provides interesting advantages when renewable energy is utilized compared to off-site hydrogen production despite their complexity. To optimize HRS design and operation, a simulation model must be implemented. This paper describes a generic on-site HRS with electrolysis-based hydrogen production, a cascaded multi-tank storage system with multiple compressors, renewable energy sources, and multiple types of dispensing formats. A modelling approach of the layout is presented and tested with real-based parameters of an HRS currently under development, which is capable of producing 11.34 kg/h of green H2 with irradiation at 1000 W/m2 . For the operation, an operational strategy is proposed. The modelled system is tested through several simulations. A sensitivity analysis of the effects of hydrogen demand and day-ahead hydrogen production objective on emissions, demand satisfaction and variable costs is performed. Simulation results show how the operational strategy has achieved service up to 310 FCEVs refuelling events of heavy duty and light duty FCEVs, bringing the total H2 sold up to almost 7200 H2kg in one month of winter. Additionally, considering variable costs of the energy from the util, This research has been developed within the CSIC Interdisciplinary Thematic Platform (PTIþ) Transición Energética Sostenible+ (PTI-TRANSENER+)[TRE2103000] as part of the CSIC program for the Spanish Recovery, Transformation and Resilience Plan funded by the Recovery and Resilience Facility of the European Union, established by the Regulation (EU) 2020/2094; project MASHED [TED2021-129927BeI00] funded by MCIN/AEI/10.13039/501100011033 and by the European Union NextGenerationEU/PRTR; and the project MAFALDA [PID2021-126001OB-C31] funded by MCIN/AEI/10.13039/501100011033 and by ERDF A way of making Europe., Peer Reviewed, Postprint (published version) more...
- Published
- 2023
40. Local Manufacturing - Strategic Operationalisation Of Lean Methods In Manufacturing-related Small And Medium-sized Enterprises (SME)
- Author
-
Herberger, David, Hübner, Marco, Saubke, Dominik, Ponert, Fabian, Krenz, Pascal, Wulfsberg, Jens P., Herberger, David, Hübner, Marco, Saubke, Dominik, Ponert, Fabian, Krenz, Pascal, and Wulfsberg, Jens P. more...
- Abstract
The economic, social and ecological crises of recent years have shown that a change in our understanding of production and value creation is necessary. A more even distribution of production capacities can promote social and economic stability. The ability to produce locally unavailable products or spare parts at short notice (e.g. manufacturing medical-products during the pandemic) avoids CO2 emissions due to transport and increases local production sovereignty and resilience. This means that production structures need to become more dynamic and responsive for spontaneous demand. Increasing local production at the place of need seems to be a solution that addresses the problems raised. When looking at currently available local production structures, small and medium-sized enterprises can be found at most locations. Unfortunately there is still a lack of productivity compared to industrial production in this enterprises. One form of overarching organisation and corporate culture that is largely established as standard in industry is the Lean Business Model. The introduction of such a strategy offers potentials for increasing the productivity and performance of a company regardless of its size. However, the methods and principles are not consistently applied in small and medium-sized enterprises. In the context of this work, studies were identified that deal with the feasibility of implementing Lean Methods in the manufacturing sector worldwide. The results were bundled into a new data model and subjected to a secondary analysis. The aim is to obtain a complete assessment of all lean implementation methods according to VDI2870 Holistic Production Systems. The suitability of the implementability in small and medium-sized enterprises is extended by an evaluation with regard to the target dimensions time, costs and quality. This creates a new possibility for strategic operationalisation of the Lean Methods for manufacturing companies. more...
- Published
- 2023
41. Modelling and operation strategy approaches for on-site Hydrogen Refuelling Stations
- Author
-
European Commission, Ministerio de Ciencia e Innovación (España), Agencia Estatal de Investigación (España), CSIC - Plataforma Temática Interdisciplinar del CSIC Transición energética (PTI TransEner +), Cardona, Pol [0000-0001-7504-2916], Costa Castelló, Ramon [0000-0003-2553-5901], Roda, Vicente [0000-0002-5235-2214], Carroquino, Javier [0000-0003-2444-8558], Valiño García, Luis [0000-0002-2384-5896], Ocampo-Martínez, Carlos [0000-0001-9251-6044], Serra, Maria [0000-0002-9885-8093], Cardona, Pol, Costa Castelló, Ramon, Roda, Vicente, Carroquino, Javier, Valiño García, Luis, Ocampo-Martínez, Carlos, Serra, Maria, European Commission, Ministerio de Ciencia e Innovación (España), Agencia Estatal de Investigación (España), CSIC - Plataforma Temática Interdisciplinar del CSIC Transición energética (PTI TransEner +), Cardona, Pol [0000-0001-7504-2916], Costa Castelló, Ramon [0000-0003-2553-5901], Roda, Vicente [0000-0002-5235-2214], Carroquino, Javier [0000-0003-2444-8558], Valiño García, Luis [0000-0002-2384-5896], Ocampo-Martínez, Carlos [0000-0001-9251-6044], Serra, Maria [0000-0002-9885-8093], Cardona, Pol, Costa Castelló, Ramon, Roda, Vicente, Carroquino, Javier, Valiño García, Luis, Ocampo-Martínez, Carlos, and Serra, Maria more...
- Abstract
The number of Fuel Cell Electric Vehicles (FCEVs) in circulation has undergone a significant increase in recent years. This trend is foreseen to be stronger in the near future. In correlation with the FCEVs market increase, the hydrogen delivery infrastructure must be developed. With this aim, many countries have announced ambitious projects. For example, Spain has the objective of increasing the number of Hydrogen Refuelling Stations (HRS) with public access from three units in operation currently to about 150 by 2030. HRSs are complex systems with high variability in terms of layout design, size of components, operational strategy, hydrogen generation method or hydrogen generation location. This paper is focused on on-site HRS with electrolysis-based hydrogen production, which provides interesting advantages when renewable energy is utilized compared to off-site hydrogen production despite their complexity. To optimize HRS design and operation, a simulation model must be implemented. This paper describes a generic on-site HRS with electrolysis-based hydrogen production, a cascaded multi-tank storage system with multiple compressors, renewable energy sources, and multiple types of dispensing formats. A modelling approach of the layout is presented and tested with real-based parameters of an HRS currently under development, which is capable of producing 11.34 kg/h of green H2 with irradiation at 1000 W/m2. For the operation, an operational strategy is proposed. The modelled system is tested through several simulations. A sensitivity analysis of the effects of hydrogen demand and day-ahead hydrogen production objective on emissions, demand satisfaction and variable costs is performed. Simulation results show how the operational strategy has achieved service up to 310 FCEVs refuelling events of heavy duty and light duty FCEVs, bringing the total H2 sold up to almost 7200 H2kg in one month of winter. Additionally, considering variable costs of the energy from the utili more...
- Published
- 2023
42. Relevantnost Clausewitza na strateško-operativni ravni vojskovanja
- Author
-
Noč, Matej and Bebler, Anton
- Subjects
war of two kinds ,rear operations ,delovanje v zaledju ,military operation ,strateške kombinacije ,vojna dveh vrst ,operativna strategija ,vojaška operacija ,udc:355.4(043.2) ,operational strategy ,strategic combinations - Abstract
V diplomskem delu ugotavljamo, v kolikšni meri je strateško-operativna misel Carla von Clausewitza še vedno aktualna pri razumevanju dinamike sodobnih konvencionalnih oboroženih konfliktov. Z izbranimi zgodovinskimi primeri 20. stoletja poskušamo podpreti posamezna teoretična izhodišča Clausewitzeve teorije. Ker je ta preobsežna, da bi jo lahko učinkovito strnili v eno nalogo, se osredotočimo le na nekatere njene vidike. V diplomskem delu se v manjšem obsegu tudi ukvarjamo z metodami bojnega dejstvovanja v nasprotnikovem zaledju. Sem spadajo partizanske operacije, operacije onemogočanja iz zraka, manevriranje kopenskih oboroženih sil v zaledju nasprotnikovih položajev itd. Čeprav so te metode v teoriji zelo privlačne, se v realnosti velikokrat izkažejo za nezadostne. Zagovorniki manevrskega bojevanja in strategije posrednega pristopa jih poveličujejo, toda Clausewitz opozarja, da moramo biti pri njihovi rabi previdni, saj sile, ki so uporabljene v nasprotnikovem zaledju, ne morejo biti vključene v boje na fronti, in sile, ki prodirajo v globino nasprotnikove razporeditve, izpostavljajo lastno umičnico. The purpose of this paper is to identify to what extent the strategic thought of Carl von Clausewitz is still relevant to understanding the dynamics of contemporary conventional armed conflicts. We will attempt to back individual theoretical bases of Clausewitzian theory with the use of historical examples from the 20th century. Clausewitz’s theory of war is far too extensive for one to thoroughly cover it in a paper of such dimensions, thus we will only be focused on certain aspects of it. To a lesser degree, we will also discuss the effectiveness of rear operations. Partisan operations, air interdiction operations, land forces maneuvering in enemy rear areas are all examples that fall under this category. Although these methods are thought to be very attractive in theory, they frequently fall short in practice. Glorified by proponents of maneuvre warfare and the strategy of indirect approach, Clausewitz warns that forces sent to operate against the enemy’s rear and flank are not avaliable for use against his front and those that penetrate deep into the enemy’s rear expose their own line of retreat. more...
- Published
- 2023
43. Performance analysis of the comprehensive energy system based on active energy storage-discharge technology under time-sharing electricity price operation strategy.
- Author
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Zhang, Dong, Jiang, Yuzhan, Wang, Shaohua, Li, Haoran, Bai, Jianhua, Zhang, Rui, and An, Zhoujian
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ENERGY storage , *ELECTRICITY pricing , *ENERGY storage equipment , *CARBON emissions , *CORPORATE profits , *POWER resources - Abstract
Multi-energy complementary comprehensive energy systems based on renewable energy can reliably meet the energy needs of communities and significantly mitigate carbon emissions. This is of paramount significance in the establishment of low-carbon sustainable communities. The effective operation of an integrated energy system necessitates a thorough examination of demand-side load, the dynamic performance of the energy supply system, the configuration of energy storage systems, local electricity pricing policies, and operational or control strategies for the system. It confronts substantial challenges in practical application. Considering the noteworthy performance variations of comprehensive energy systems under diverse demand-side load, fluctuating electricity prices, and various operating modes of energy storage equipment, this paper initially conducts a practical analysis of demand-side load. A comprehensive energy system with multi-energy complementary based on source-load-storage coordination (SLS-CES) model was constructed. From the perspective of system operation strategy, we identify the current electricity consumption pattern in the region, characterized by peak and valley periods. We integrate this information with the time-of-use electricity pricing policy and the equipment within the target area. An operation strategy based on local time-of-use electricity price policy was proposed. An in-depth analysis of the thermal performance, environmental performance, and economic performance of the system in the full-year dimension and typical daily dimension under this operating strategy was conducted. The results show that under this operation strategy, the system's annual net income is 415.90 thousand yuan, of which the system's energy storage battery power supply revenue during peak period reaches 254.40 thousand yuan. The initial investment is 5.03 million yuan, and the static investment payback period is 12.09 years. The annual primary energy saving rate of the system is 36.00%, and the maximum CO 2 emission reduction rate is 72.23%. The maximum primary energy saving rates on typical days in winter and typical days in summer are 74.74% and 97.14% respectively. The total annual CO 2 emissions were reduced by 5.47 tons and 4.54 tons respectively. Through this study, we found that a system incorporating energy storage equipment, combined with an operation strategy based on electricity price policy, can yield additional economic benefits. This approach helps alleviate peak power supply pressure on the grid and mitigates the challenges associated with the high initial investment in renewable energy systems, all while maintaining good thermal performance and environmental benefits. [ABSTRACT FROM AUTHOR] more...
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- 2024
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44. Improving the service of E-bike sharing by demand pattern analysis: A data-driven approach.
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Zhang, Ziru, Krishnakumari, Panchamy, Schulte, Frederik, and van Oort, Niels
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In recent years, there has been a surge in the popularity of free-floating e-bike sharing. However, the shared mobility sector is fiercely competitive demanding, efficient operations and high-quality service to cater to user expectations. We propose several data-driven methods that apply demand pattern analysis. We suggest the use of a new spatial unit (i.e., overlapping circles) to enhance the cost-efficiency and user-friendliness of e-bike sharing. Moreover, temporal clustering is employed to develop operational strategies that counter the imbalance in supply and demand in recurrent clusters. To evaluate the impact of these strategies, we introduce a framework and apply it in a case study of an e-bike sharing project in The Hague, The Netherlands. We identify 5 hourly clusters which enable reallocation strategies to alleviate the imbalance among spatial units in these clusters. The results demonstrate that the derived operational strategies improve the service significantly, with almost 1.5 times increased ridership, an approximately 20% decrease in vehicle idle time, and a decent monthly net retention rate of around 60%. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
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45. The Operational Strategy Optimization of Distributed Energy System Based on MATLAB : A case study in Northeast China
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Han, Yujun
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Distribuerat energisystem ,CCHP ,operativ strategi ,Teknik och teknologier ,Distributed Energy System ,operational strategy ,Engineering and Technology - Abstract
China is the largest energy consumer worldwide, with a fast-growing rate. But the energy and environmental problems brought by its unbalanced energy structure and low energy efficiency restrict the sustainable development of China. The Distributed Energy System (DES) is one of the internationally recognized solutions to the problems. To enhance the implementation of the DES under China’s scenario, the thesis develops computational models for the Combined Cooling, Heat, and Power (CCHP) and Separated Cooling, Heat, and Power (SCHP) systems for a Micro Energy Grid in northeast China using MATLAB. The objective is to minimize the overall expenditure, energy use, and carbon emission equivalents. The results show that the CCHP system reduces 18.62% of the overall expenditure and 35.02% of the carbon emission equivalents than the SCHP system. The CCHP system has a promising prospect in China with better Greenhouse Gas emissions reduction and economic performance. Kina är världens största energikonsument, med en snabb tillväxttakt. Men de energi- och miljöproblem som orsakas av den obalanserade energistrukturen och den låga energieffektiviteten begränsar Kinas hållbara utveckling. Distribuerade energisystem (DES) är en av de internationellt erkända lösningarna på dessa problem. För att förbättra implementeringen av DES enligt Kinas scenario utvecklar avhandlingen beräkningsmodeller för kombinerad kylning, värme och kraft (CCHP) och separerad kylning, värme och kraft (SCHP) för ett mikroenerginät i nordöstra Kina med hjälp av MATLAB. Målet är att minimera de totala kostnaderna, energianvändningen och koldioxidutsläppen. Resultaten visar att CCHP-systemet minskar de totala utgifterna med 18,62 % och koldioxidutsläppen med 35,02 % jämfört med SCHP-systemet. CCHP-systemet har lovande utsikter i Kina med bättre minskning av växthusgasutsläpp och ekonomisk prestanda. more...
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- 2023
46. High-frequency monitoring enables operational opportunities to reduce the dissolved organic carbon (DOC) load in Germany’s largest drinking water reservoir
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Zhan, Qing, Kong, Xiangzhen, Rinke, Karsten, Zhan, Qing, Kong, Xiangzhen, and Rinke, Karsten
- Abstract
Rising dissolved organic carbon (DOC) is interfering with drinking water production. While strategies for DOC removal during water treatment have been successfully implemented, the potential for DOC load reduction by optimized reservoir operation is not yet fully explored, mainly constrained by data paucity on real-time DOC dynamics. In this study, we utilized the emerging in situ high-frequency (HF) monitoring technique for DOC and developed a simulation–operation framework that promotes DOC mitigation in Germany’s largest drinking water reservoir. Rappbode Reservoir is embedded in a network of smaller upstream reservoirs from which Königshütte Reservoir delivers the most water but can also be operated as a bypass system. Using high-frequency monitoring of DOC concentrations and discharge at the inflows and outflows, we constructed a mass balance model that simulated the DOC dynamics in the reservoir, allowing us to explore alternative operation regimes that deliver the same amount of water but a lower DOC load. Our results show that, through rapid decision-making that enables bypassing of water with high DOC concentrations around the drinking water reservoir, the optimized operation regime is able to reduce DOC load of the drinking water reservoir by 25 ± 3%. Therefore, our proposed operational strategy to minimize DOC loading to reservoirs is promising. more...
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- 2022
47. Linking strategy implementation to financial performance and firm survival in women-owned small to medium enterprises
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Mudara, Zwanaka James and Mafini, Chengedzai
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financial performance ,Business strategy ,SME survival ,corporate strategy ,operational strategy - Abstract
PURPOSE OF THE STUDY: Women-owned SMEs in South Africa are plagued with numerous challenges that contribute to the slow growth and failure of their businesses. Among these challenges are inadequate managerial skills related to the formulation and implementation of suitable strategies. This study aimed to determine the influence of strategy implementation on financial performance and the survival of women-owned SMEs in Gauteng province, South AfricaDESIGN/METHODOLOGY/APPROACH: The study followed a quantitative method in which a six-section survey questionnaire was administered to 347 women entrepreneurs conveniently selected from SMEs in Gauteng Province. Statistical analyses techniques applied in the study included descriptive statistics, exploratory factor analysis, Pearson correlations and regression analysisFINDINGS: Corporate and business strategies predicted financial performance. However, operational strategy was statistically insignificant. Additionally, all three strategies, namely operational, business, and corporate, significantly predicted SME survival. Financial performance predicted SME survivalRECOMMENDATIONS/VALUE: Efforts to alleviate the decline and failure of women-owned SMEs should centre on imparting the owners with business management skills that primarily include an understanding of the formulation and implementation of strategy. Future research suggestions include extending the study to male-owned SMEs, other provinces of South Africa and the inclusion of non-registered SMEsMANAGERIAL IMPLICATIONS: Strategy formulation and implementation remain important anchors for the success of women-owned SMEs in South AfricaJEL CLASSIFICATION: L26 more...
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- 2022
48. Techno-economic analysis for the effects of electricity pricing system on the market competitiveness of cogeneration model.
- Author
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Im, Yong Hoon and Youn, Young Jik
- Abstract
In this study, the actual operation status of the cogeneration model was investigated to examine the difference between the theoretical evaluation and the field operation situation. The adequacy of the installed capacity of the cogeneration system was assessed by using in-house developed diagnostic analysis simulation tool, and the effects of operational strategy on securing operational cost benefit under the progressive electricity rate system was also examined with event-based operating characteristic analysis. The installed prime mover was found to be designed excessively by an average of 47%, and the relative primary energy savings showed a large deviation in the range of 3–22% for each case. As a result of analyzing the effect of the rapid expansion of renewable energy on the operational performance, it was found that when the renewable power distribution ratio was increased to 30%, the relative primary energy savings effect fell to less than 5%. As an alternative, a hybrid cogeneration model integrated with heat pump was proposed, and it was confirmed that it could have the effect of mitigating the effect of expanding renewable energy. • A survey of actual operating conditions of the cogeneration model. • Diagnostic analysis to assess the adequacy of installed prime mover's capacity. • Assessment for the impact of energy pricing system the market competitiveness of the cogeneration model. • Analysis of the effects of the expansion of renewable power on technological excellence. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
- Full Text
- View/download PDF
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