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399 results on '"Xu, Yuqing"'

1. Chapter A Blockchain-Based Secure Submission Management Framework for Design and Construction Phases

Author

Das, Moumita, Tao, Xingyu, Xu, Yuqing, and Cheng, Jack C. P.

Subjects
Version Management, Issue Management, Security, Blockchain, thema EDItEUR::U Computing and Information Technology
Abstract

AEC projects generate numerous versions of BIM models during the design and construction phases. This process is complicated by the sheer number of domains in large projects and the interlinkage of BIM deliverables (for example the structural BIM model follows the corresponding architectural BIM model). However, due to the generation of multiple versions and parallel design progress in different domains (especially in large projects), multi-domain delivery teams often fail to access and comply with the latest/required/approved design requirements during the progression of the design phase and complete issue addressing during the construction phase, which creates confusion, may lead to disputes. Moreover, due to the contractual nature of the parties involved data and process security is also very important. Therefore, this research presents blockchain-based secure coordination workflows for effective collaboration, parallel design progress, and issue management among BIM developers from multiple domains. Smart contract logic for facilitating dynamic dependency logic for coordinating linked multi-domain submission over the project timeline is presented. A method to ensure that issues are completely, and timely addressed, and related parties are held accountable for their actions or non-response is presented by integrating a BIM change identifier and blockchain in typical issue management workflows. The method considers collaborative design and issue management workflows for the secure, efficient, and complete design of BIM models. The method is validated using an ongoing large construction project in Hong Kong

Published
2023
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2. Chapter Fast and Secure BIM Design Using Blockchain: An Example of Makeshift Hospital Project for COVID-19 Treatment in Hong Kong

Author

Gong, Xingbo, Das, Moumita, Liu, Hao, Tao, Xingyu, Xu, Yuqing, Cheng, Jack C. P., and Zheng, Chengliang

Subjects
Covid-19, BIM, Blockchain, Makeshift Hospital, Smart Contract, thema EDItEUR::U Computing and Information Technology::UT Computer networking and communications::UTV Virtualization
Abstract

A crucial action of COVID-19 combat is the quick design and building of makeshift hospitals (MHs). Although adopting building information modeling (BIM) promotes the digitalization and communication of design collaboration, data security vulnerabilities (e.g., lacking traceability and transparency) are detected and have inevitably impeded the efficiency and productivity of the MH project. Such problems often lead to rework and unnecessary disputes, wasting valuable time on projects requiring ultra-fast construction speed. The emerging blockchain technology offers an immutable and traceable collaboration environment. However, limited studies have integrated blockchain in the BIM design process, especially design in emergency projects like MH. Therefore, this paper proposes a blockchain-enabled collaboration (BEC) framework for fast and secure BIM design. The framework is illustrated in an actual MH project in Hong Kong, and results show that: (1) it supports secure and automated BIM data exchange and (2) it saves 23 % of the time in a design coordination case

Published
2023
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5. A Bilevel Programming Model for Designing a Collaborative Network for Regional Railway Transportation and Logistics: The Case of the Beijing-Tianjin-Hebei Region in China

Author

Zhu, Taoxing, Xu, Yuqing, Zhang, Junyi, and Zhao, Bukang

Subjects
Railroads -- International economic relations -- Design and construction, Logistics services, Transportation industry -- International economic relations, Transportation industry
Abstract

For the coordinated development of regional logistics, there is a need to break down the administrative barriers between cities and build an efficient and smooth regional logistics network. Integrating regional logistics resources to achieve cross-regional optimal allocation is essential for efficient logistics networks. The accessibility and high capacity of the railway transportation network make it possible and necessary for the coordinated construction of railway transportation and logistics networks. This paper studies a bilevel programming model to analyse the collaborative network planning process of railway transportation and logistics. The objective is to take into account the existing layout of regional railway traffic network and the future needs of regional logistics. For the upper level of the bilevel programming model, the social, economic, and logistics service index of regional railway traffic nodes is considered to determine the numbers and locations of radiation of the cities. Meanwhile, the lower programming model uses a logistics gravity model, 0-1 integer programming model, and logistics membership degree to calculate the logistics correlation between node cities and the radiation range of the hub cities. An empirical study of the Beijing-Tianjin-Hebei region in China shows the process and effectiveness of the bilevel programming model. Four distinctive logistics radiation circles, five trunk lines, nine hub-spoke branch lines, and six branch lines are suggested. A railway traffic-oriented regional logistics network provides a reference for regional railway traffic planning, thereby optimizing the allocation of regional logistics resources, improving the level of regional logistics services, and contributing to the development of the regional logistics industry., Author(s): Taoxing Zhu (corresponding author) [1]; Yuqing Xu [1,2]; Junyi Zhang [3]; Bukang Zhao [1] 1. Introduction Logistics is a phenomenon factor flow that supports regional sustainable development. Logistics channels [...]

Published
2024
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6. A phase 3 randomized, double-blind, placebo-controlled study to evaluate the efficacy and safety of sarilumab in patients with giant cell arteritis

Author

Schmidt, Wolfgang A., Dasgupta, Bhaskar, Sloane, Jennifer, Giannelou, Angeliki, Xu, Yuqing, Unizony, Sebastian H., Mackie, Sarah L., Gonzalez-Gay, Miguel A., Spiera, Robert, Warrington, Kenneth J., Villiger, Peter M., Nivens, Michael C., Akinlade, Bolanle, Lin, Yong, Buttgereit, Frank, and Stone, John H.

Published
2023
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33. An all-digital charge to digital converter

Author

Xu, Yuqing

Abstract

During the last two decades, the topic of the Internet of Things (IoT) has become very popular. It provides an idea that everything in the real world should be connected with the internet in the future. Integrating sensors into small wireless networked nodes is a huge challenge due to the low power/energy budget in wireless sensor systems. An integrated sensor normally consumes significant power and has complex design which increases the cost. The core part of the sensor is the sensor interface which consumes major power especially for a capacitor-based sensor. Capacitive sensors and voltage sensors are two frequently used sensor types in the wireless sensor family. Capacitive sensors, that transform capacitance values into digital outputs, can be used in areas such as biomedical, environmental, and mobile applications. Voltage sensors are also widely used in many modern areas such as Energy Harvesting (EH) systems. Both of these sensors may make use of sensor interfaces to transform a measured analogue signal into a frequency output or a digital code for use in a digital system. Existing sensor interfaces normally use complex analog-to-digital converter (ADC) techniques that consume high power and suffers from slow sensing response. This thesis proposes a smart all-digital dual-use capacitorbased sensor interface called charge to digital converter (QDC). This QDC is capable of not only sensing capacitance but also sensing voltages by using fully digital solutions based on iterative delay chain discharge. Unlike the conventional methods vii that only treats the sensed capacitance only as the input signal, this thesis proposes a method that can directly use the stored energy from the sensed capacitance as well to power parts of the circuit, which simplifies the design and saves power. By playing with the capacitance and input voltage, it can be used as a capacitance-to-digital converter (CDC) to sense capacitance under fixed input voltage and it also can be used as a capacitorbased voltage sensor interface to measure voltage level under fixed capacitance. The new method achieves the same accuracy with less than half the circuit size, and 25% and 33% savings on power and energy consumption compared with the state of art benchmark. The method has been validated by experimenting with a chip fabricated in 350nm process, in addition to extensive simulation analysis.

Published
2020

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