• Title, Summary, Keyword: Local bus

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Bus Reconfiguration Strategy Based on Local Minimum Tree Search for the Event Processing of Automated Distribution Substations

  • Ko Yun-Seok
    • KIEE International Transactions on Power Engineering
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    • v.5A no.2
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    • pp.177-185
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    • 2005
  • This paper proposes an expert system that can enhance the accuracy of real-time bus reconfiguration strategy by adopting the local minimum tree search method and that can minimize the spreading effect of the fault by considering the operating condition when a main transformer fault occurs in an automated substation. The local minimum tree search method is used to expand the best-first search method. This method has the advantage that it can improve the solution performance within the limits of the real-time condition. The inference strategy proposed expert system consists of two stages. The first stage determines the switching candidate set by searching possible switching candidates starting from the main transformer or busbar related to the event. The second stage determines the rational real-time bus reconfiguration strategy based on heuristic rules from the obtained switching candidate set. Also, this paper proposes generalized distribution substation modeling using graph theory, and a substation database based on the study results is designed.

Establishment of design model considering surrounding environment and users in public design - Focused on the bus station (공공디자인에 있어서 이용자와 주변 환경을 고려한 디자인 모델구축 - 버스정류장을 중심으로)

  • Hyoung, Sung-Eun
    • Science of Emotion and Sensibility
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    • v.12 no.4
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    • pp.451-460
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    • 2009
  • This study had been carried out based on the users' behavioral pattern in order to survey characteristics of bus station, a public facility. As a detailed analysis, quantification theory type 3 was performed based on 50 number of samples installed at each local governments as targets in order to evaluate bus station attributes and to survey its characteristics. As a result of this experiment, it was revealed that installation pattern of bus station would differ depending on characteristics of four axis of migrating population density, functionality and simplicity, metropolitan city of densely populated companies, local city with strong locality, the front of school with dense migrating population, secluded rural village, specific place like museum, rural area with dense migrating population. Therefore, in this study, detailed items were suggested comprehensively so that the design considering local environment and users' characteristics, in addition to modeling features of bus stations suitable for local characteristics, could be progressed. If any design and model complying with local environmental features based on above contents should be applied, bus station would be assessed by the users more positively in the future.

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Study on Local Bus Service after Bus Route Reform in Busan (버스노선개편 이후 부산 시내버스 운행실태에 관한 고찰)

  • Song, Ki-Wook;Jung, Hun-Young;Lee, Joon-Seung
    • Journal of Korean Society of Transportation
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    • v.26 no.3
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    • pp.41-51
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    • 2008
  • As the local bus service diagram after the bus route reform is studied by variable analysis based on traffic card data and income adjustment data, the characteristic of the local bus system is revealed in Busan Metropolitan city. The relationship between traveling length and traveling time is influenced by traveling velocity. In order to keep a headway within 10 minutes, bus service number per minute should be over 0.1013 vehicles. The traveling time of afternoon is generally longer than that of forenoon. Compared with the bus used by a lot people, the deviation of that used by a few people is larger in the all cases of length, headway, time and velocity. According to the analysis of the relationship among card trip number, average income and transfer rate, the relationship between card trip number and average income is expressed as linear function in the general bus and as exponential function in the high-grade & rapid bus. The 1% increase of transfer rate is equal to 6.3 trip/vehicle/day decrease and 4.9 trip/vehicle/day decrease in two bus types respectively. The four effective variables are defined by the discriminant analysis between the profitable routes and the unprofitable; According to discriminant size, bus service number per km, bus via suburb, subway meeting number, bus via university. In order to increase the income when the minibus will be included among public transit transfer system in 2008, it should be necessary to settle the bus network and revitalize the public transit better. In order to decrease the cost, it should be necessary to reorganize the hierarchy between the local bus and the minibus better.

Integration of Express·Intercity Bus Terminal and Highway Service Area: A Study of the Estimated Tangible Value Addition (고속·시외버스 터미널 및 고속도로 휴게소의 통폐합 운영에 따른 편익가치 산정에 대한 연구)

  • Jang, Jae min;Han, Jung hun
    • International Journal of Highway Engineering
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    • v.19 no.2
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    • pp.143-152
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    • 2017
  • PURPOSES : This study intends to estimate the tangible benefits derived from the integration of operations of an Express Intercity Bus Terminal and a Highway Service Area. METHODS: For the study, a highway service area was chosen to function as a bus terminal, integrating its services with that of a nearby bus terminal plagued by operating losses. The exercise also helped improve mobility owing to the introduction of local buses between the terminals and utilization of the existing infrastructure such as rest areas. Thus, a terminal that was not being utilized for its intended functionality was integrated with an existing facility to improve the utilization of both and subsequently aid local development. The impact of the exercise was then measured by evaluating the variation in utilization efficiency, operating costs, travel time between two regions (Seoul-Jeomchon and Seoul-Geumsan), and the social costs before and after the integration of the two facilities. RESULTS :The impact of the integration was an increase in utilization efficiency, a decrease in operating cost, a decrease in travel time, and a decrease in social cost in both the regions. The benefits of improved utilization and cost saving can be passed on to the citizens in the form of discounts. A local power generation facility will eventually replace the bus terminal, which can revitalize the local economy. CONCLUSIONS :The integration of the highway service area with the bus terminal is expected to have a win-win effect on the passengers as well as the operators. The study also proposes a sustainable strategic plan for existing terminals and rest areas to implement a method to compete with KTX transportation.

Bus Reconfiguration Strategy Based on Local Minimum Tree Search for the Event Processing of Automated Distribution Substation (자동화된 변전소의 이벤트 발생시 준최적 탐색법에 기반한 모선 재구성 전략의 개발)

  • Ko Yun-Seok
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.53 no.10
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    • pp.565-572
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    • 2004
  • This paper proposes an expert system which can enhance the accuracy of real-time bus reconfiguration strategy by adopting local minimum tree search method and minimize the spreading effect of the fault by considering totally the operating condition when a main transformer fault occurs in the automated substation. The local minimum tree search method to expand the best-first search method. This method has an advantage which can improve the performance of solution within the limits of the real-time condition. The inference strategy proposed expert system consists of two stages. The first stage determines the switching candidate set by searching possible switching candidates starting from the main transformer or busbar related to the event. And, second stage determines the rational real-time bus reconfiguration strategy based on heuristic rules for the obtained switching candidate set. Also, this paper studies the generalized distribution substation modelling using graph theory and a substation database is designed based on the study result. The inference engine of the expert system and the substation database is implemented in MFC function of Visual C++. Finally, the performance and effectiveness of the proposed expert system is verified by comparing the best-first search solution and local minimum tree search solution based on diversity event simulations for typical distribution substation.

A Study on the Public Traffic Policy in Information Age: Focused on the Bus Quasi-Public Operating System in Gwang-ju Metropolitan City (정보화시대의 대중교통정책 : 광주광역시의 버스준공영제를 중심으로)

  • Joun, Joung-Hwan
    • Journal of Digital Convergence
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    • v.8 no.4
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    • pp.19-33
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    • 2010
  • As one of the most traffic devices, bus has played a great role in Korea for the last years. However, a great many peoples in big cities have continually decreased with the increase of private car ownership. It causes lower quality of bus service and unstability of operation in many bus companies. In the several local government, the operation system of bus was changed to Bus Quasi-Public Operating System. The aim of this study is to assess the effects and to suggest improvement strategies of Bus QPOS. According to the results of the analysis, Bus QPOS has brought various positive effects, but it has occurred negative effects, especially a much increase of government subsidies to bus company. To resolve a negative effects, government should examine the whole condition of bus operations. This study suggests strategies to improve Bus QPOS, which is including transparency of management, fair assessment system, standard cost system for bus operations.

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A Study on the Design and the Performance Evaluation of System Bus for a MC 68000Based Multiprocessor System (멀티프로세서 시스템 구성을 위한 시스템 버스의 설계 및 성능평가에 관한 연구)

  • 이남재;김영천
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.15 no.2
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    • pp.88-97
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    • 1990
  • In this paper, DPA bus is proposed for implementation of MC 68000 based tightly-coupled multiprocessor system. The DPMC and arbiter are designed that the local memory of each PE can accept memory request both from a local processor and from the system bus. The performance of the proposed system bus is evaluated by Stochastic Petri Net(SPN) system modeling. The processing power, the efficiency, and the utilization of system bus are simulated for various load factors.

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Mechanism for Improving Data Rate on PCI 2.2 Interface (PCI 2.2 Data 전송 효율을 향상시키기 위한 메커니즘)

  • 현유진;성광수
    • Proceedings of the IEEK Conference
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    • pp.807-810
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    • 2003
  • The PCI 2.2 spec introduces Delayed Transaction mechanism to improve system performance for target device with slow local bus. But this mechanism has some restriction since target device doesn't know prefetch data size. So, we propose a new mechanism, which target device prefetch exact data on local bus, to improve data rate on PCI or local interface. The simulation results showed that the proposed mechanism more improves system performance than the Delayed Transaction mechanism.

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