45 results on '"Nikitas, Alexandros"'
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2. Examining the impact of air cargo growth on poor Vietnamese rural and urban households
- Author
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Njoya, Eric Tchouamou, Forsyth, Peter, Niemeier, Hans-Martin, and Nikitas, Alexandros
- Published
- 2023
- Full Text
- View/download PDF
3. Ranking sustainable urban mobility indicators and their matching transport policies to support liveable city Futures: A MICMAC approach
- Author
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Chatziioannou, Ioannis, Nikitas, Alexandros, Tzouras, Panagiotis G., Bakogiannis, Efthimios, Alvarez-Icaza, Luis, Chias-Becerril, Luis, Karolemeas, Christos, Tsigdinos, Stefanos, Wallgren, Pontus, and Rexfelt, Oskar
- Published
- 2023
- Full Text
- View/download PDF
4. Evaluating the suitability of urban road networks to facilitate autonomous buses
- Author
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Karolemeas, Christos, Tsigdinos, Stefanos, Bakogiannis, Efthimios, and Nikitas, Alexandros
- Published
- 2022
- Full Text
- View/download PDF
5. Assessing agriculture–tourism linkages in Senegal : A structure path analysis
- Author
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Njoya, Eric Tchouamou and Nikitas, Alexandros
- Published
- 2020
6. Understanding the attitudes of older people to road pricing
- Author
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Nikitas, Alexandros
- Subjects
388.049 - Abstract
Worldwide the human population shows an ageing demographic structure. Older people often face the danger of social exclusion; arguably more often than other age groups. Nonetheless, at least in the western world, older people are more interested in local democracy and are more likely to vote than younger people, so their decisions can be important for social policy in general, and potentially in the acceptability of road pricing. Therefore, practitioners proposing road pricing schemes need to understand particularly well the implications for older people and their attitudes towards the policy if they are to deliver effective schemes successfully. From the literature reviewed it was hypothesised that older people might ascribe more importance to collective consequences and tend to support what could be beneficial for society, a process described as ‘pro-social value orientation’. Hence in a transport context, older people may be more likely to express positive or negative attitudes to the acceptability of road pricing depending on whether they believe it would be good or bad for others, or society in general. Family, friends or more generally their significant others may also have a particular influence on older people’s evaluations about their intentions and choices – thus the importance of studying the influence of ‘social norms’ on older people’s attitudes towards road pricing. The Thesis develops a theoretical and empirical understanding of these issues, based on a secondary analysis and predominately on a two-stage primary research scheme consisting of a quantitative survey and a series of focus groups conducted in Bristol, a city that has been near the forefront of UK cities planning road pricing schemes. Robust evidence is provided for the view that the attitudes, social norms and pro-social value orientations of older people towards road pricing are different from those of younger people with those of people aged 60 to 74 being the most negative and those of people aged 75 and over the most positive ones. Finally it is justified that older people’s particular pro-social value orientations and social norms do affect their attitudes to road pricing. – mostly negatively for the people aged 60 to 74 and positively for the people aged 75 and over.
- Published
- 2010
7. Task Allocation Methods and Optimization Techniques in Edge Computing: A Systematic Review of the Literature
- Author
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Patsias, Vasilios, primary, Amanatidis, Petros, additional, Karampatzakis, Dimitris, additional, Lagkas, Thomas, additional, Michalakopoulou, Kalliopi, additional, and Nikitas, Alexandros, additional
- Published
- 2023
- Full Text
- View/download PDF
8. Cooperative Task Execution for Object Detection in Edge Computing: An Internet of Things Application
- Author
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Amanatidis, Petros, primary, Karampatzakis, Dimitris, additional, Iosifidis, George, additional, Lagkas, Thomas, additional, and Nikitas, Alexandros, additional
- Published
- 2023
- Full Text
- View/download PDF
9. Public Acceptance and Willingness to Pay for Carbon Capture and Utilisation Products
- Author
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Pieri, Tryfonas, primary, Nikitas, Alexandros, additional, and Angelis-Dimakis, Athanasios, additional
- Published
- 2023
- Full Text
- View/download PDF
10. Cooperative Task Execution for Object Detection in Edge Computing: An Internet of Things Application
- Author
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Amanatidis, Petros (author), Karampatzakis, Dimitris (author), Iosifidis, G. (author), Lagkas, Thomas (author), Nikitas, Alexandros (author), Amanatidis, Petros (author), Karampatzakis, Dimitris (author), Iosifidis, G. (author), Lagkas, Thomas (author), and Nikitas, Alexandros (author)
- Abstract
The development of computer hardware and communications has brought with it many exciting applications in the Internet of Things. More and more Single Board Computers (SBC) with high performance and low power consumption are used to infer deep learning models at the edge of the network. In this article, we investigate a cooperative task execution system in an edge computing architecture. In our topology, the edge server offloads different workloads to end devices, which collaboratively execute object detection on the transmitted sets of images. Our proposed system attempts to provide optimization in terms of execution accuracy and execution time for inferencing deep learning models. Furthermore, we focus on implementing new policies to optimize the E2E execution time and the execution accuracy of the system by highlighting the key role of effective image compression and the batch sizes (splitting decisions) received by the end devices from a server at the network edge. In our testbed, we used the You Only Look Once (YOLO) version 5, which is one of the most popular object detectors. In our heterogeneous testbed, an edge server and three different end devices were used with different characteristics like CPU/TPU, different sizes of RAM, and different neural network input sizes to identify sharp trade-offs. Firstly, we implemented the YOLOv5 on our end devices to evaluate the performance of the model using metrics like Precision, Recall, and mAP on the COCO dataset. Finally, we explore optimal trade-offs for different task-splitting strategies and compression decisions to optimize total performance. We demonstrate that offloading workloads on multiple end devices based on different splitting decisions and compression values improves the system’s performance to respond in real-time conditions without needing a server or cloud resources., Networked Systems
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- 2023
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11. P76 CAROTID THERMAL HETEROGENEITY AND DYSLIPIDEMIA: THE HEAT IS ON
- Author
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Iosif Koutagiar, Charalambos Vlachopoulos, Dimitrios Terentes-Printzios, Ioannis Skoumas, Evangelia Sigala, Vasiliki Gardikioti, Stavroula Pantou, Angeliki Rigatou, Nikolaos Ioakeimidis, Christos Georgakopoulos, Nikitas-Alexandros Skliros, Georgios Benetos, Spiros Galanakos, and Dimitrios Tousoulis
- Subjects
Specialties of internal medicine ,RC581-951 ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
Background: Microwave Radiometry (MWR) is a new validated method, which allows evaluation of thermal heterogeneity of carotid arteries and is associated with inflammation.Purpose: The aim of this pilot study was to determine if thermal heterogeneity in the carotid arteries is associated with aortic elastic properties in patients with dyslipidemia and whether treatment for dyslipidemia affects thermal heterogeneity. Method: Twenty-nine patients with dyslipidemia (mean age 42 ± 13 years, range 22–75, 19 men) without known cardiovascular disease, underwent assessment of carotid thermal heterogeneity (temperature difference-ΔT) using MWR. Mean common carotid intima-media thickness (CIMT) was also assessed. Twenty-one patients were treated for 6 months with statin or/and ezetimibe and thermal heterogeneity was assessed after treatment. Results: There was a positive correlation between ΔT and cIMT (r = 0.474, p = 0.009). In multivariate regression analysis, after adjustment for potential confounders such as age, sex, mean blood pressure and body-mass index, cIMT showed a positive correlation with ΔT in carotid arteries (Adjusted R2 = 0.258, p = 0.048). Thermal heterogeneity after 6 months of treatment was reduced statistically significant (0.88 ± 0.42 to 0.58 ± 0.29 °C, p = 0.021) (Image). Conclusion: In a group of patients with dyslipidemia thermal heterogeneity in the carotid arteries was positively associated with carotid subclinical atherosclerosis. Moreover, dyslipidemia treatment reduced thermal heterogeneity after a short-term period, implying a beneficial effect of treatment on thermal heterogeneity.
- Published
- 2018
- Full Text
- View/download PDF
12. Waste sorting in apartments: integrating the perspective of the user
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Ordoñez, Isabel, Harder, Robin, Nikitas, Alexandros, and Rahe, Ulrike
- Published
- 2015
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13. P76 Carotid Thermal Heterogeneity and Dyslipidemia: The Heat is on
- Author
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Koutagiar, Iosif, Vlachopoulos, Charalambos, Terentes-Printzios, Dimitrios, Skoumas, Ioannis, Sigala, Evangelia, Gardikioti, Vasiliki, Pantou, Stavroula, Rigatou, Angeliki, Ioakeimidis, Nikolaos, Georgakopoulos, Christos, Skliros, Nikitas-Alexandros, Benetos, Georgios, Galanakos, Spiros, and Tousoulis, Dimitrios
- Published
- 2018
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14. The Effects of Diminished Tourism Arrivals and Expenditures Caused by Terrorism and Political Unrest on the Kenyan Economy
- Author
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Njoya, Eric Tchouamou, primary, Efthymiou, Marina, additional, Nikitas, Alexandros, additional, and O’Connell, John F., additional
- Published
- 2022
- Full Text
- View/download PDF
15. Pharmaceutical supply chains and management innovation?
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Papalexi, Marina, Bamford, David, Nikitas, Alexandros, Breen, Liz, Tipi, Nicoleta, Papalexi, Marina, Bamford, David, Nikitas, Alexandros, Breen, Liz, and Tipi, Nicoleta
- Abstract
This research evaluates the implementation of innovative programmes within the downstream domain of the Pharmaceutical Supply Chain (PSC), with the aim of informing improved service provision. A mixed-method approach was used to assess to what extent innovation could be adopted by hospital and community pharmacies to improve the delivery process of pharmaceutical products. Unstructured interviews and 130 questionnaires were collected and analysed to identify factors that facilitate or prevent innovation within PSC processes. The analysis led to the creation of the Innovative Pharmaceutical Supply Chain Framework (IPSCF) that provides guidance to healthcare organisations about how Supply Chain Management (SCM) problems could be addressed by implementing innovative approaches. The results also indicated that the implementation of Lean and Reverse Logistics (RL) practices, supported by integrated Information Technology (IT) systems, can help healthcare organisations to enhance their delivery in terms of quality (products and service quality), visibility (knowledge and information sharing), speed (response to customers and suppliers needs) and cost (minimisation of cost and waste). The study’s recommendations have potential implications for supply chain theory and practice, particularly for pharmacies in terms of innovation adoption. The IPSCF provides guidance to pharmacies and healthcare organisations to develop more efficient and effective supply chain strategies. This research contributes to academic literature as it adds novel theoretical insights to highly complex delivery process innovation.
- Published
- 2022
16. The Environmental and Resource Dimensions of Automated Transport: A Nexus for Enabling Vehicle Automation to Support Sustainable Urban Mobility
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Nikitas, Alexandros, primary, Thomopoulos, Nikolas, additional, and Milakis, Dimitris, additional
- Published
- 2021
- Full Text
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17. Cycling in the Era of COVID-19: Lessons Learnt and Best Practice Policy Recommendations for a More Bike-Centric Future
- Author
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Nikitas, Alexandros, primary, Tsigdinos, Stefanos, additional, Karolemeas, Christos, additional, Kourmpa, Efthymia, additional, and Bakogiannis, Efthimios, additional
- Published
- 2021
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18. Determining Electric Vehicle Charging Station Location Suitability: A Qualitative Study of Greek Stakeholders Employing Thematic Analysis and Analytical Hierarchy Process
- Author
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Karolemeas, Christos, primary, Tsigdinos, Stefanos, additional, Tzouras, Panagiotis G., additional, Nikitas, Alexandros, additional, and Bakogiannis, Efthimios, additional
- Published
- 2021
- Full Text
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19. Artificial Intelligence, Transport and the Smart City: Definitions and Dimensions of a New Mobility Era
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Nikitas, Alexandros, primary, Michalakopoulou, Kalliopi, additional, Njoya, Eric Tchouamou, additional, and Karampatzakis, Dimitris, additional
- Published
- 2020
- Full Text
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20. Assessing agriculture–tourism linkages in Senegal: A structure path analysis
- Author
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Tchouamou Njoya, Eric, primary and Nikitas, Alexandros, additional
- Published
- 2019
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- View/download PDF
21. How to Save Bike-Sharing: An Evidence-Based Survival Toolkit for Policy-Makers and Mobility Providers
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Nikitas, Alexandros, primary
- Published
- 2019
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22. Er:YAG and Diode Lasers in Treatment of Peri-Implantitis–A Case Report
- Author
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Nikitas, Alexandros, primary
- Published
- 2019
- Full Text
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23. Assessing agriculture–tourism linkages in Senegal: A structure path analysis.
- Author
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Tchouamou Njoya, Eric and Nikitas, Alexandros
- Subjects
PATH analysis (Statistics) ,LOCAL foods ,TOURISM impact ,FOOD supply ,TOURISM ,FOOD industry - Abstract
In sub-Saharan Africa (SSA), in general, and Senegal, in particular, tourism has often been proposed as a pro-poor development strategy due to its intensive use of unskilled labour. However, few studies have examined the linkage between tourism and agriculture, which is still the principal sector for employment in many SSA countries. Using a Structure Path Analysis (SPA), this paper investigates how, in structural terms, an exogenous demand shock on the tourism industry affects the Senegalese agricultural sector. The SPA results show that one of the core sub-sectors of tourism hotels and restaurants has relatively weak linkages with suppliers of agricultural inputs. Staple crops is identified as the agricultural sub-sector that has the most significant impact on tourism. Food and beverage processing plays an indirect but important role in the way hotels and restaurants industry impacts agriculture. Our analysis provides robust evidence that tourism has the capacity to create opportunities for the farmers and local food supply chains through generating additional demand for food products. Policy interventions looking to amplify the benefits that tourism can generate for agriculture, for the case of Senegal and comparable SSA countries, should focus on measures aiming at minimising imports of manufactured food and imports reflecting and affecting food and beverage processing and investing in agritourism development initiatives, such as farm-based accommodation, agricultural festivals and farm-tours. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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24. Holistic Assessment of Carbon Capture and Utilization Value Chains
- Author
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Pieri, Tryfonas, primary, Nikitas, Alexandros, additional, Castillo-Castillo, Arturo, additional, and Angelis-Dimakis, Athanasios, additional
- Published
- 2018
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25. Public Attitudes to Road Pricing: Exploring the Role of Older Age, Pro-Sociality, Social Norms and Trust
- Author
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Nikitas, Alexandros, Avineri, Erel, and Parkhurst, Graham
- Subjects
HE - Abstract
Understanding the socio-psychological mechanisms that determine the public acceptability of road pricing could be a key for its implementation in urban environments where this is a viable scenario. Studying the attitudes of older people is of particular importance due to the aging of the populations in the industrialized democracies, the high political engagement of older people, and their vulnerability to transport-related social exclusion. Research by the present authors had previously identified that older people's beliefs about what is the normal, acceptable, or even expected choice in a particular social context (“social norms”) and their tendency to favor, more than any other age group, what is positively valued by society (“pro-social value orientation”) affect their attitudes to road pricing. The present paper aims to develop an in-depth understanding of these attitude-shaping determinants drawing on the findings of focus groups conducted in Bristol, UK. The findings suggest that there are three distinctive expressions of pro-sociality: pro-environmental values and generativity on the one hand, these two being drivers of support for road pricing, and pro-equity values on the other, which tend to drive opposition. Social norms have two particular expressions: subjective norms (i.e. norms reflecting people’s immediate social environment) and norms referring to others and society in general. Furthermore, a theory-driven thematic analysis indicates that trust in the integrity of the concept and older age as a life stage associated with aging, retirement, lower income, mobility barriers and deteriorating health are important in how attitudes reflecting and affecting public acceptability to road pricing form
- Published
- 2016
26. Road Pricing and Older People: An In-depth Study of Attitudes, Pro-Social Values and Social Norms
- Author
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Nikitas, Alexandros, Avineri, Erel, and Parkhurst, Graham
- Subjects
HE ,TA ,H1 - Abstract
Understanding the socio-psychological mechanisms that determine the public acceptability of road pricing could be a key for its implementation in urban environments where this is a viable scenario. Studying the attitudes of older people is of particular importance due to the ageing of the populations in the industrialised democracies, the high political engagement of older people, and their vulnerability to transport-related social exclusion. Research by the present authors had previously identified that older people's beliefs about what is the normal, acceptable, or even expected choice in a particular social context (“social norms”) and their tendency to favour, more than any other age group, what is positively valued by society (“pro-social value orientation”) affect their attitudes to road pricing. The present paper aims to develop an in-depth understanding of these attitude-shaping determinants drawing on the findings of focus groups conducted in Bristol, UK. The findings suggest that there are three distinctive expressions of pro-sociality: pro-environmental values and generativity on the one hand, these two being drivers of support for road pricing, and pro-equity values on the other, which tend to drive opposition. Social norms have two particular expressions: subjective norms (i.e. norms reflecting people’s immediate social environment) and norms referring to others and society in general. Furthermore, a theory-driven thematic analysis indicates that trust in the integrity of the concept and older age as a life stage associated with ageing, retirement, lower income, mobility barriers and deteriorating health are important in how attitudes reflecting and affecting public acceptability to road pricing form.
- Published
- 2016
27. P76 CAROTID THERMAL HETEROGENEITY AND DYSLIPIDEMIA: THE HEAT IS ON
- Author
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Christos Georgakopoulos, Ioannis Skoumas, Nikolaos Ioakeimidis, V Gardikioti, Iosif Koutagiar, Charalambos Vlachopoulos, S. Pantou, Angeliki Rigatou, Dimitrios Tousoulis, Georgios Benetos, Nikitas-Alexandros Skliros, Dimitrios Terentes-Printzios, Spiros Galanakos, and E. Sigala
- Subjects
lcsh:Diseases of the circulatory (Cardiovascular) system ,medicine.medical_specialty ,lcsh:Specialties of internal medicine ,business.industry ,General Medicine ,medicine.disease ,lcsh:RC581-951 ,lcsh:RC666-701 ,Internal medicine ,cardiovascular system ,medicine ,Cardiology ,cardiovascular diseases ,business ,Dyslipidemia - Abstract
Background: Microwave Radiometry (MWR) is a new validated method, which allows evaluation of thermal heterogeneity of carotid arteries and is associated with inflammation.Purpose: The aim of this pilot study was to determine if thermal heterogeneity in the carotid arteries is associated with aortic elastic properties in patients with dyslipidemia and whether treatment for dyslipidemia affects thermal heterogeneity. Method: Twenty-nine patients with dyslipidemia (mean age 42 ± 13 years, range 22–75, 19 men) without known cardiovascular disease, underwent assessment of carotid thermal heterogeneity (temperature difference-ΔT) using MWR. Mean common carotid intima-media thickness (CIMT) was also assessed. Twenty-one patients were treated for 6 months with statin or/and ezetimibe and thermal heterogeneity was assessed after treatment. Results: There was a positive correlation between ΔT and cIMT (r = 0.474, p = 0.009). In multivariate regression analysis, after adjustment for potential confounders such as age, sex, mean blood pressure and body-mass index, cIMT showed a positive correlation with ΔT in carotid arteries (Adjusted R2 = 0.258, p = 0.048). Thermal heterogeneity after 6 months of treatment was reduced statistically significant (0.88 ± 0.42 to 0.58 ± 0.29 °C, p = 0.021) (Image). Conclusion: In a group of patients with dyslipidemia thermal heterogeneity in the carotid arteries was positively associated with carotid subclinical atherosclerosis. Moreover, dyslipidemia treatment reduced thermal heterogeneity after a short-term period, implying a beneficial effect of treatment on thermal heterogeneity.
- Published
- 2018
28. How Can Autonomous and Connected Vehicles, Electromobility, BRT, Hyperloop, Shared Use Mobility and Mobility-As-A-Service Shape Transport Futures for the Context of Smart Cities?
- Author
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Nikitas, Alexandros, primary, Kougias, Ioannis, additional, Alyavina, Elena, additional, and Njoya Tchouamou, Eric, additional
- Published
- 2017
- Full Text
- View/download PDF
29. Understanding Public Attitudes to Bike-Sharing in Gothenburg
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Nikitas, Alexandros and Wallgren, Pontus
- Subjects
HE - Published
- 2014
30. Carotid thermal heterogeneity and dyslipidemia: the heat is on
- Author
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Koutagiar, Iosif, Vlachopoulos, Charalambos, Terentes-Printzios, Dimitrios, Skoumas, Ioannis, Sigala, Evangelia, Gardikioti, Vasiliki, Pantou, Stavroula, Rigatou, Angeliki, Ioakeimidis, Nikolaos, Georgakopoulos, Christos, Skliros, Nikitas-Alexandros, Benetos, Georgios, Galanakos, Spiros, and Tousoulis, Dimitrios
- Published
- 2018
- Full Text
- View/download PDF
31. Identifying and Surpassing Contextual Barriers in Cross-Border Research Collaboration: The Case of the Sino-Swedish Project Shanghai Local Interaction Platform
- Author
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Nikitas, Alexandros and Rahe, Ulrike
- Subjects
HE - Published
- 2013
32. Strategic Design through Brand Contextualization
- Author
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Karjalainen, Toni-Matti, Nikitas, Alexandros, and Rahe, Ulrike
- Subjects
HE ,ComputingMilieux_MISCELLANEOUS - Abstract
Providing meaningful customer experience is at the core of any successful business activity. Brands can function as vehicles to bundle the ingredients of experience together and give them structure by which consumers are able to understand and interpret products and services. To complement the technical and functional reality and experience, brands create particular narratives around products and services, within the realm of their use experience. This paper aims to contribute to understanding of strategic design and brand contextualization by looking thoroughly into a research-driven student project. The product-service design assignment given to seven teams of four to five post-graduate students was to design a new bike-sharing system, serving the sustainable urban mobility needs of the city of Gothenburg in Sweden. The task was accompanied by a request to create a fictive brand case and specific brand narrative, based on a thorough analysis of pre-selected existing brands. The paper discusses how the teams crafted their brand narratives and how different design and service elements were used to create specific and meaningful brand experiences. In addition to the contribution of the paper to design research and practice, we present a process that might be more widely useful for the education of strategic design and brand management.
- Published
- 2013
33. Innovative Bike-Sharing Design as a Research and Educational Platform for Promoting More Livable Urban Futures
- Author
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Nikitas, Alexandros, Rahe, Ulrike, and Karjalainen, Toni-Matti
- Subjects
HE - Abstract
Studying the viability of innovative urban access design is the key in achieving optimum results when attempting to transform dogmatism referring to conventional car-orientation into a meaningful driver of modal change founded on the actual societal needs for future transportation. An efficient public bicycle scheme could be the very definition of a system that could encourage and even facilitate, in real terms, such a transition. This paper is discussing how a post-graduate course embraced, through the means of a service-oriented design exercise, the potential introduction of such a system. More specifically, seven research teams, closely guided by the three authors, were affiliated with designing a new hypothetical bike-sharing scheme in the city of Gothenburg, Sweden more captivating than the existing one. The paper reports on: a) the novel educational approach the tutors employed, b) the taught experiences that helped the students utilize their potential as learners but also as inventive designers, c) the research in terms of design results and d) the overall transition from solely serving the needs of automotive mobility in urban environments, to creating a knowledge platform that actually illustrates an improved design-innovation process to tackle future urban demands and eventually have a real-life context impact on the city of Gothenburg.
- Published
- 2013
34. Examining the Attitudes, Pro-Social Value Orientations and Social Norms of Older People to Road Pricing
- Author
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Nikitas, Alexandros
- Subjects
HE - Abstract
This study is set to investigate the relationship between older age and the acceptability of road pricing. Specifically, it examines the attitudes of the people aged 60 and over to road pricing in comparison with the attitudes of younger people using relevant literature review findings, secondary data analysis and the results of a questionnaire and three group discussions. Moreover, this research examines whether older people’s support for what is positively valued for society affects these attitudes. Older people are more likely to express positive or negative opinions about road pricing depending on whether they believe it would be good or bad for others, or society. The influence that family, friends or others in general may have on people’s beliefs about road pricing is another subject that is examined. By looking into these issues this work highlights some of the potential opportunities and problems in the present context of the acceptability of road pricing. This will hopefully help policy-makers to decide on actual design criteria and consultation mechanisms that could assist in promoting and communicating better road pricing to older people, making it publicly and therefore politically more acceptable.
- Published
- 2010
35. A Worldwide State-of-the-Art Analysis for Bus Rapid Transit: Looking for the Success Formula
- Author
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Nikitas, Alexandros, primary and Karlsson, MariAnne, additional
- Published
- 2015
- Full Text
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36. Road Pricing and Older People: Identifying Age-Specific Differences Between Older and Younger People's Attitudes, Social Norms and Pro-Social Value Orientations to Road Pricing
- Author
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Nikitas, Alexandros
- Subjects
HE - Abstract
The implementation of road pricing schemes is likely to be an inescapable measure in the future of managing road transport demand in highly congested environments. Since public acceptability is the ‘Holy Grail’ of charging policy-making, revealing the special attitudinal issues of older people may help the identification of some of the potential social dilemmas of road pricing. In an ageing society, where older people have a growing influence in politics in general, and potentially in the acceptability of road pricing in particular, their attitudes to road pricing are of particular interest because they face specific types of risk of transport-related social exclusion. Moreover, older people favour, more than any other age groups, what is positively valued for society – a process termed as ‘pro-social value orientation’. Hence in a transport context, older people may be more likely to express positive or negative attitudes to the acceptability of road pricing depending on whether they believe it would be good or bad for others, or society in general. Family and friends may also have a particular influence on older people’s evaluations about their intentions and choices - thus the importance of studying the influence of ‘social norms’ on older people’s attitudes to road pricing. The paper will develop a thorough theoretical and empirical understanding of these issues, based on the findings of a primarily quantitatively-assessed survey of 491 post-back responses combined with secondary data analysis. This will lead to the identification of age-specific differences of public attitudes to road pricing. All in all, some support is provided for the view that attitudes to road pricing do vary with age as pro-social value orientations, social norms and their influence on attitudes also do.
- Published
- 2009
37. Heat, Hills and the High Season: A Model-Based Comparative Analysis of Spatio-Temporal Factors Affecting Shared Bicycle Use in Three Southern European Islands.
- Author
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Maas, Suzanne, Nikolaou, Paraskevas, Attard, Maria, Dimitriou, Loukas, and Nikitas, Alexandros
- Abstract
Bicycle sharing systems (BSSs) have been implemented in cities worldwide in an attempt to promote cycling. Despite exhibiting characteristics considered to be barriers to cycling, such as hot summers, hilliness and car-oriented infrastructure, Southern European island cities and tourist destinations Limassol (Cyprus), Las Palmas de Gran Canaria (Canary Islands, Spain) and the Valletta conurbation (Malta) are all experiencing the implementation of BSSs and policies to promote cycling. In this study, a year of trip data and secondary datasets are used to analyze dock-based BSS usage in the three case-study cities. How land use, socio-economic, network and temporal factors influence BSS use at station locations, both as an origin and as a destination, was examined using bivariate correlation analysis and through the development of linear mixed models for each case study. Bivariate correlations showed significant positive associations with the number of cafes and restaurants, vicinity to the beach or promenade and the percentage of foreign population at the BSS station locations in all cities. A positive relation with cycling infrastructure was evident in Limassol and Las Palmas de Gran Canaria, but not in Malta, as no cycling infrastructure is present in the island's conurbation, where the BSS is primarily operational. Elevation had a negative association with BSS use in all three cities. In Limassol and Malta, where seasonality in weather patterns is strongest, a negative effect of rainfall and a positive effect of higher temperature were observed. Although there was a positive association between BSS use and the number of visiting tourists in Limassol and Malta, this is predominantly explained through the multi-collinearity with weather factors rather than by intensive use of the BSS by tourists. The linear mixed models showed more fine-grained results and explained differences in BSS use at stations, including differences for station use as an origin and as a destination. The insights from the correlation analysis and linear mixed models can be used to inform policies promoting cycling and BSS use and support sustainable mobility policies in the case-study cities and cities with similar characteristics. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
38. A New User-Based Incentive Strategy for Improving Bike Sharing Systems' Performance.
- Author
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El Sibai, Rayane, Challita, Khalil, Bou Abdo, Jacques, Demerjian, Jacques, Nikitas, Alexandros, and Bakogiannis, Efthimios
- Abstract
The benefits of having a Bike Sharing System (BSS) in a city are numerous. Among other advantages, it promotes a cleaner environment with less traffic and pollution. One major problem the users of such services encounter is that of full or empty stations, causing user dissatisfaction. The objective of this work is to propose a new user-based incentive method to enhance BSS performance. The proposed method relies on a spatial outlier detection algorithm. It consists of adapting the departure and arrival stations of the users to the BSS state by stimulating the users to change their journeys in view of minimizing the number of full and empty stations. Experiments are carried out to compare our proposed method to some existing methods for enhancing the resource availability of BSSs, and they are performed on a real dataset issued from a well-known BSS called Velib. The results show that the proposed strategy improves the availability of BSS resources, even when the collaboration of users is partial. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
39. Traffic Simulation Analysis of Bicycle Highways in Urban Areas.
- Author
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Grigoropoulos, Georgios, Hosseini, Seyed Abdollah, Keler, Andreas, Kaths, Heather, Spangler, Matthias, Busch, Fritz, Bogenberger, Klaus, Nikitas, Alexandros, and Bakogiannis, Efthimios
- Abstract
The ongoing increase of bicycle traffic in urban areas forces transport authorities to reconsider the space allocation for different transport modes. Transport policies favor the introduction of high-quality bicycle infrastructure along urban corridors to improve the traffic quality and safety for bicyclists but more importantly to increase the attractiveness of bicycling and over vehicular modes. Especially in urban areas with an already established high and steadily increasing share of bicyclists, the introduction of bicycle highways is considered to further alleviate saturated interurban public transport and motor vehicle connections and increase the average traveled distance by non-motorized modes. Due to the expensive implementation costs and the space restrictions in already built-up urban environments, there should be an extensive planning phase for defining the expected changes in traffic efficiency and safety. However, the effects of urban bicycle highways on traffic performance metrics of bicyclists as well as other road users are not thoroughly studied. This paper aims to quantify and assess the potential effects of urban bicycle highway on road users. The study considers a possible inner-city pilot route in the city of Munich, where the present bicycle infrastructure is planned to be upgraded to a bicycle highway. A simulation model is designed using traffic data from field observations and future estimates for the traffic composition. Through microscopic traffic simulation, the potential effects of the introduced infrastructure on road users are determined for different study scenarios. Results show that traffic quality thresholds for bicycle highways, as defined in official guidelines, can only be fulfilled through the implementation of special bicycle traffic control measures such as bicycle coordination or bicycle passage time extension. Finally, unidirectional bicycle highways together with bicycle passage time extension provided the best overall traffic performance for bicycle traffic and motor vehicle traffic. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
40. Bike-Sharing: Is Safety an Issue Adversely Affecting its Potential for Being Embraced by Urban Societies?
- Author
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Nikitas, Alexandros, Michalakopoulos, Nikitas, and Wallgren, Pontus
- Subjects
HE - Abstract
Using bicycles on an ‘as-needed’ basis, usually for a small rental fee and without the externalities and obligations linked to bicycle ownership, is what makes public bicycles a societally affordable medium to enhance the transition to a more sustainable urban transport paradigm. However, despite its distinctive character in terms of its potential to be a mechanism transforming in some degree urban mobility to a shared responsibility regime, bike-sharing still faces some of the same safety concerns associated with ordinary bicycle ridership. The most common problem for cyclists’ wellbeing is that the traffic system is designed predominately from a car-user perspective. Even the cities that have recently implemented public bicycle programmes, and therefore showed some extra care to provide fitting urban conditions for them, have not yet achieved to fully eclipse car-orientation as the prime cornerstone of their development norms. This means that transport systems worldwide do not necessarily take fully into account the main characteristics of cyclists reflecting safety themes: a cyclist is vulnerable (in a crash), flexible (in behaviour), instable (may fall off the bike), inconspicuous (difficult to see), has differing abilities (due to a wide range of the population), is conscious of effort (i.e., highly motivated to minimize energy expenditure), and sometimes seen as intruders in the traffic systems, rather than as an integral part. This work refers to the results of a research scheme that meant to examine road users’ attitudes directly reflecting public acceptability towards two bike-sharing schemes in Drama (Greece, 50.000 residents) and Gothenburg (Sweden, 500.000 residents). Although safety was not the principal initiative for doing this dual study, one key conclusion was that many people could not embrace bike-sharing due to their perceptions that bicycle represents in general an unsafe travel mode and that their cities provide only limited road safety for cyclists.
41. Designing the Metropolitan Future of Shanghai: A Local Interaction Platform Looking to Incorporate Urban Access Design Considerations in Planning for a Fairer, Denser and Greener Mega-City
- Author
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Nikitas, Alexandros and Rahe, Ulrike
- Subjects
HE - Abstract
Urban design, that will formulate resourceful ways to promote more sustainable and socially inclusive mobility patterns, is the key to reversing the alarming energy over-consumption, the environmental degradation, and the negative distributional impacts associated with today's cities that tend to relegate anthropocentric design considerations to the status of a non-issue. Urban access is an innovative and truly trans-disciplinary design axiom that aims to incorporate these considerations to mainstream future urban planning. It does this by ensuring that every member of the society has access to those locations and resources one needs to achieve a sustainable standard of living and productivity without limiting other people’s rights of access. Designing built environments for achieving optimum urban access levels for everyone, regardless of possible age or mobility limitations, serves as the thematic framework for the research studies of the Local Interaction Platform (LIP) Shanghai discussed in this paper. This is a Sino-Swedish research scheme goaled towards increasing capacities, in order to transform current, unsustainable urban development pathways to more sustainable urban futures for the metropolitan environment of Shanghai. This paper presents a research synopsis of the various and diverse urban access driven studies that are on the focus of LIP Shanghai regarding the city’s: existent road network infrastructure limitations, bus systems accessibility design, potential to have a public bicycle programme in place and existing car travel demand management mechanism and its possible alternative.
42. Mentoring and Coaching in Transport and Logistics Higher Education: Issues and Challenges
- Author
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Ziogas, Christina, Nikitas, Alexandros, and Jenkins, Andrew Kevin
- Subjects
ComputingMilieux_THECOMPUTINGPROFESSION ,HE ,ComputingMilieux_COMPUTERSANDEDUCATION - Abstract
Mentoring is widely accepted as a developmental process for personal growth and career advancement. Its functions are often carried out within the context of a long-term, continuous and supportive relationship between a skilled or more experienced person (mentor) who serves as a role model to teach, sponsor, encourage and counsel and a less experienced individual (mentee). Although some evidence exists to support the idea that, where mentoring practices are applied in higher education, students tend to perform better as scholars and experience higher confidence and morale, mentoring is still under-utilised when used as a way to help support individuals’ personal and professional development. Meanwhile, larger organisations tend to invest significant resources on talent management activities, as a means to identify how such activities are being utilised to develop current assets within organisations, develop leadership, support change or bridge the gap of insufficiently qualified graduates in industry. \ud This paper presents a structured literature review on mentoring and coaching including similarities and differences in each approach and their appropriateness in transport and logistics higher education. It provides an understanding of each concept and suggests relevant applications as an effective means of maximising the potential of existing and prospective students and employees. Finally, it discusses the extent to which “mentoring and coaching” can be used in transport and \ud logistics higher education as a developmental approach to provide students with a competitive edge when entering the workplace.
43. Understanding Mobility as a Service (MAAS) and its potential for enabling sustainable travel behaviour
- Author
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Alyavina, Elena and Nikitas, Alexandros
- Subjects
H Social Sciences (General) ,HE Transportation and Communications ,HM Sociology - Abstract
The establishment of automobile-centred mobility paradigm over the past decades resulted in significant degradation of social, economic, and environmental sustainability. Mobility as a Service (MaaS) is a novel concept that aims to create a shift in individuals' travel behaviour away from private car dependence maximising the potential of alternative modes. Recent research suggests, however, that transport users are not yet ready to abandon their cars while those who intend to use MaaS may fully substitute not only personal car trips but also public transport journeys with car-based shared use mobility services. This means that MaaS penetration, contrary to expectations, may result in unsustainable travel practices among its users and further aggravate transport related sustainability issues. Therefore, this thesis makes its purpose to develop an in-depth understanding of potential travel behavioural implications of MaaS identifying opportunities and challenges in its ability to create sustainable travel behavioural change and produce evidence-based recommendations for policy makers and mobility providers to support sustainable travel behaviour with MaaS. This study meets its aim by employing a two-stage consequential mixed-methods approach. The first stage is qualitative and targets 40 transport users residing in three different locations around the UK, namely London, Birmingham, and Huddersfield. The data is collected via semi-structured individual interviews and examined using Thematic Analysis. The second research stage comprises of an online quantitative survey, developed using the findings of the literature review and the Thematic Analysis results. A total of 427 useable responses from UK general public were collected and worked through using a combination of Univariate Analysis and Principal Component Analysis followed by Ordinal Regression Modelling. Thematic Analysis has resulted in identification of five important themes affecting and reflecting user intention to commit to sustainable travel with MaaS - Car Dependence; Trust; Human Element Externalities; Value; and Cost, - each of them with distinctive dimensions, expressed as their sub-themes. Forty attitudinal Likert-Scale statements, pertaining to the Thematic Analysis results, were developed and tested at the surveying stage. After undergoing Principal Component Analysis, the attitudinal statements formed eight MaaS attitudinal factors, with the five core themes developed through Thematic Analysis retained and some of their sub-themes becoming independent. The relationships and dynamics between the eight factors, complemented by socio-demographic and past behaviour items, and MaaS induced travel behavioural intentions were explored using Ordinal Regression. Univariate Analysis confirmed that just about 19% of transport users in the United Kingdom would consider not owning a car when equipped with MaaS, while circa 60% agreed they would replace some of their public transport trips with car-based shared use mobility options. Ordinal Regression Modelling demonstrated the ability of the eight factors, combined with past behaviour and, in some cases, socio-demographic variables, to explain circa 40% of variance in these behavioural intentions, with Value, Human Element Externalities, Trust, Cost, and Car Ownership dimension of Car Dependence being the most commonly appearing significant predictors. These findings are used to produce evidence-based policy recommendations, targeting MaaS related individual attitudes and past travel practices, that will help making MaaS an effective tool for enabling sustainable travel behaviour among transport users.
- Published
- 2022
44. Exploring public acceptance of Connected and Autonomous Vehicles with a focus on cyber security and privacy risks
- Author
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Liu, Na and Nikitas, Alexandros
- Subjects
T Technology (General) - Abstract
Connected and Autonomous Vehicles (CAVs) constitute an automotive development carrying paradigm-shifting potential that may soon be embedded into a dynamically changing urban mobility landscape. The complex machine-led dynamics of CAVs make them more prone to data exploitation and vulnerable to cyber-attacks than any of their predecessors. This increases the risks of privacy breaches and cyber security violations for their users. Cyber security and privacy issues are of significant concern for automated mobility since they can adversely affect the public acceptance of CAVs, give them a bad reputation at this embryonic stage of their development, create barriers to their adoption and increased use, which ultimately complicates the business models of their future operations and ultimately their diffusion. Therefore, it is vital to identify and create an in-depth understanding of the cyber security and privacy issues associated with CAVs as it is something that will support a more systematic identification and contextualisation of the factors determining public acceptance of CAVs. This empirical research aims to do exactly that by employing a sequential mixed method approach, with a qualitative phase looking in depth cyber security and privacy issues followed by a survey-based phase looking to model the factors underpinning CAV acceptance. For the qualitative research phase, 36 semi-structured elite interviews were organised with CAV experts that already anticipate problems and look for their solutions. Thematic analysis was used to identify and contextualise the factors that reflect and affect CAV acceptance in relation to the privacy and cyber security agendas. Six core themes emerged: awareness, user and vendor education, safety, responsibility, legislation, and trust. Each of these themes has diverse and distinctive dimensions and are discussed herein as sub-themes. For the quantitative research phase, a theory-based extended technology acceptance model (TAM) model was developed and validated through an online survey of 1162 residents from the UK and China. The confirmative factor analysis-structural equation modelling (CFA-SEM) approach was used to analyse the collected data. Results suggested that perceived usefulness and perceived ease of use remain the most robust predictors that determine the using intention of CAVs. The exogenous variables, namely self-efficacy, facilitating conditions and perceived risks, were significant predictors of the intention to use CAVs. The perceived system characteristics such as the relative advantages of CAVs, the cyber security and privacy risks, and the perceived organisational factors like government, manufacturers, and service providers' facilitation in personal data protection are proved to be crucial in the users' attitude forming process. Based on the overall findings, policy recommendations were provided to make CAVs more cyber secure and privacy friendly. These include prioritising cyber security and privacy issues in CAVs, utilising social media tools in promoting positive social influences and developing a novel human-machine interface that would enable easy and safe operations. The study also suggests that mitigating the cyber security and 5 privacy risks embedded in CAVs require inter-institutional cooperation, awareness campaigns and trials for trust-building purposes, mandatory educational training for manufacturers and perhaps more importantly for end-users, balanced and fair responsibility-sharing, two-way dynamic communication channels and a clear consensus on what constitutes threats and solutions. Additionally, recommendations for CAV market-entry and market penetration routes were given based on the multigroup analysis results.
- Published
- 2021
45. An investigation into the aspects of innovation within the downstream domain of the pharmaceutical supply chain
- Author
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Papalexi, Marina, Bamford, David, Tipi, Nicoleta, and Nikitas, Alexandros
- Subjects
615.1068 ,HF Commerce ,RS Pharmacy and materia medica - Abstract
An investigation into the aspects of innovation within the downstream domain of the pharmaceutical supply chain This research evaluates the implementation of innovative programmes within the downstream domain of the Pharmaceutical Supply Chain (PSC). Pharmacies are considered as key links between healthcare services and patients because they are responsible for dispensing and managing pharmaceuticals in order to prolong life. Considering the healthcare organisations‘ crucial role and that they face the challenge of minimising the cost of healthcare services while enhancing service quality, healthcare organisations tend to try improvement approaches and innovative interventions to enhance their efficiency and effectiveness. Specifically, they tend to focus on improving their Supply Chain Management (SCM) in order to reduce waste, in particular with regards to their medicine expenditure, and to provide improved services. However, implementing innovation within the Pharmaceutical Supply Chain (PSC) is not yet adequate; at present there appears to be a lack of experience and knowledge of how such initiatives should be undertaken. Research that examines potential innovative contributions might therefore make a defined contribution to the sector. This research, therefore, aims to assess the current medicine delivery process and identify the issues responsible for weak process performances and the factors that influence pharmacies‘ innovativeness within two diverse European contexts, the UK and Greece. An exploratory research design, embracing a mixed-methods approach, was used to analyse the issues associated with PSC inefficiency and assess to what extent innovation could be adopted by hospital and community pharmacies to improve the delivery process of pharmaceutical products. The qualitative data was gathered through 30 interviews with key professionals working within the downstream domain of the PSC in the two selected geographical areas. A total of 21 in-depth interviews in the UK and 9 in Greece were conducted to examine the elements preventing the effective and efficient delivery of medicines. Simultaneously, an online survey was developed to collect the quantitative data. The final sample (N=130) consisted of specialists working within the down stream domain of the PSC in Greece and the UK. The quantitative data analysis aimed to identify the factors that support or prevent innovation within this specific and complex environment. The analysis and combination of these two sets of data enabled the researcher to gain a comprehensive understanding and recommend innovative solutions that are suitable to the system under investigation, leading to continuous improvement. This research contriputes to academic literature as it adds more theoritical insights to innovative delively processes, especially those that have been characterised as highly complex. The results led to the generation of the Innovative Pharmaceutical Supply Chain Framework (IPSCF) that provides guidelines to healthcare organisations about how the identified problems can be overcome by implementing suitable innovative techniques. The implementation of Lean and Reverse Logistics practices, which are supported by integrated Information Technology (IT) systems, are suggested as a means for healthcare organisations to enhance their delivery system in terms of quality (products and service quality), visibility (knowledge and information sharing), speed (respond to customers and suppliers needs) and cost (minimisation of cost and waste) and therefore generate a competitive edge. The study‘s recommendations have important implications for pharmacies, as they provide guidance regards suitable innovative programmes that can be adopted. The outputs of this research are specifically relevant to the pharmacy sectors of the UK and Greece, but may have also relevance for European healthcare organisations.
- Published
- 2017
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