The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
Gomaa Ahmed Hamoud - One of the best experts on this subject based on the ideXlab platform.
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Assessment of spare breaker requirements for high voltage transmission Stations
2015 IEEE Power & Energy Society General Meeting, 2015Co-Authors: Gomaa Ahmed HamoudAbstract:Summary form only given. This paper describes a probabilistic method based on a total risk index (probability times consequences) for assessing the number of spare breakers required for a group of similar high voltage breakers used in switching and transformer Stations. The proposed method uses a Markov model for assessing the probability of failures and a bulk power system reliability program for evaluating failure consequences. The method considers a number of factors such as the group size, unit failure rate, unit repair time, transmission Station Layout, and other power system parameters that may impact the number of spare breakers. A cost/benefit analysis approach is used in determining the required number of spare breakers. The number of spare units is determined when the total cost (sum of spare unit costs, system operating costs and system outage costs due to breaker failures) is minimum. An example is given to illustrate the proposed method of assessment.
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Assessment of spare breaker requirements for high voltage transmission Stations
IEEE Transactions on Power Systems, 2013Co-Authors: Gomaa Ahmed HamoudAbstract:This paper describes a probabilistic method based on a total risk index (probability times consequences) for assessing the number of spare breakers required for a group of similar high voltage breakers used in switching and transformer Stations. The proposed method uses a Markov model for assessing the probability of failures and a bulk power system reliability program for evaluating failure consequences. The method considers a number of factors such as the group size, unit failure rate, unit repair time, transmission Station Layout, and other power system parameters that may impact the number of spare breakers. A cost/benefit analysis approach is used in determining the required number of spare breakers. The number of spare units is determined when the total cost (sum of spare unit costs, system operating costs and system outage costs due to breaker failures) is minimum. An example is given to illustrate the proposed method of assessment.
Francisco Barcelo - One of the best experts on this subject based on the ideXlab platform.
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planning the base Station Layout in umts urban scenarios a simulation approach to coverage and capacity estimation
International Conference on Telecommunications, 2004Co-Authors: Enrica Zola, Francisco BarceloAbstract:This paper analyzes the performance of a base Station Layout for a UMTS network in a densely populated city. The study is carried out using snapshot simulations of an actual city (Barcelona, Spain) with specific traffic and propagation profiles. A first Layout is proposed in order to guarantee good coverage with a minimum number of base Stations. This Layout is approached taking into account the link budget analytical calculations and the first simulation results for a single-cell environment. A second Layout is then presented in an attempt to solve the problems that arise in the first (e.g. shadows, blind zones, etc.). This is carried out by finely tuning parameters from the first Layout, adding new base Stations and changing the locations of the existing ones.
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ICT - Planning the base Station Layout in UMTS urban scenarios: a simulation approach to coverage and capacity estimation
Telecommunications and Networking - ICT 2004, 2004Co-Authors: Enrica Zola, Francisco BarceloAbstract:This paper analyzes the performance of a base Station Layout for a UMTS network in a densely populated city. The study is carried out using snapshot simulations of an actual city (Barcelona, Spain) with specific traffic and propagation profiles. A first Layout is proposed in order to guarantee good coverage with a minimum number of base Stations. This Layout is approached taking into account the link budget analytical calculations and the first simulation results for a single-cell environment. A second Layout is then presented in an attempt to solve the problems that arise in the first (e.g. shadows, blind zones, etc.). This is carried out by finely tuning parameters from the first Layout, adding new base Stations and changing the locations of the existing ones.
Shukai Li - One of the best experts on this subject based on the ideXlab platform.
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integrated multi track Station Layout design and train scheduling models on railway corridors
Transportation Research Part C-emerging Technologies, 2016Co-Authors: Jianguo Qi, Lixing Yang, Shukai LiAbstract:Abstract The dwelling capacity of the Station (mainly determined by its multi-track Layout) is a practically significant factor to influence the quality of the train schedules, especially in a busy railway corridor with heterogeneous trains and complex operations. To improve the passing capacity and transportation efficiency, this paper focuses on a network design problem over a railway corridor, in which some critical Stations are considered to enlarge the number of siding tracks or platforms within the budget constraints. To evaluate the quality of design strategies, the construction cost and total travel time in the corresponding optimal train schedule are adopted as evaluation indexes. Based on two specific modeling methodologies, two types of optimization models are particularly formulated with different considerations. One is a single-level linear mixed-integer programming (S-LMIP) model based on the space–time network representation method; the other is a bi-level programming model associated with the platform choice-based method, where the upper level of the proposed model aims to design new siding tracks/platforms in the candidate Stations, and the lower level is a train scheduling model with assigning the tracks for each train at each Station. The commercial software GAMS with CPLEX solver and local searching based heuristic with integrated CPLEX solver are respectively employed to solve the near-optimal solutions for these two types of models. Finally, two sets of examples, in which a sample railway corridor and the Wuhan–Guangzhou high-speed railway corridor are adopted as the experimental environments, are implemented to illustrate the performance and effectiveness of the proposed approaches.
Chenxu Dai - One of the best experts on this subject based on the ideXlab platform.
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Parallel Service Management Framework and Application to Railway Station Layout Planning
IEEE Intelligent Systems, 2015Co-Authors: Lefei Li, Chen Lyu, Jun Luo, Shuyun Yang, Chenxu DaiAbstract:People always say that the customer is god, but do they really understand this 'god'? In practice, the nature of service, such as its intangibility and heterogeneity, makes the effective management of service operations difficult. To better incorporate human behaviors and other complex factors to facilitate service management decisions, the authors propose a new approach called parallel service management. PSM, which follows the ACP framework, is an emerging methodology in complex systems modeling and analysis. In PSM, customer agents, service employee agents, service organization agents, and the service environment construct an artificial service system, which can run in parallel with the real service system. The authors developed an agent-based artificial service system for the Chengdu East Railway Station, which let them make better Layout planning decisions. The modification plan was then implemented in the Station and achieved significant increase in store entering rate. Statistical comparison proves PSM's potential to enhance the performance of the real service systems.
Gu Yu-xiang - One of the best experts on this subject based on the ideXlab platform.
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A Station Layout Optimization Algorithm for Tri-Station TDOA Location
Telecommunication Engineering, 2020Co-Authors: Gu Yu-xiangAbstract:Station Layout has a direct impact on location precision for the tri-Station TDOA (time difference of arrival) location system. In order to optimize the overall location precision of targets in certain area, an algorithm for Station Layout optimization is presented. HDOP (horizontal dilution of precision) is regarded as the measurement rule of location precision. Then the multi-object programming mathematical model of Station Layout optimization is built. The optimal solution is searched by constructing minmax evaluation function. Consequently, the optimal Layout of Stations is obtained. The simulation provides the HDOP distribution of two Station Layouts. One is the initial Station Layout, and the other is the optimal Station Layout. The simulation results show that for the optimal Station Layout, the effect of improving the location precision is obvious, and also indicate the validity of this algorithm.