• Title/Summary/Keyword: bus service

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IEC61850 Process Bus Based Distributed Power Quality Monitoring (IEC61850 프로세서 버스 기반 분산형 전력품질감시)

  • Park, Jong-Chan;Kim, Byung-Jin
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.56 no.1
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    • pp.13-18
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    • 2007
  • In this paper, authors deal with an application of power quality monitoring using the Sampled Value which is described in the IEC61850 International Standard for substation communication. Firstly, while Merging Unit is designed as a process level device transmitting sensor data, the practical problems such as time delay compensation and optical fiber communication are issued. Secondly, the Sampled Value message which is proper to a power quality monitoring system is presented. Because the power quality monitoring system requests non time critical service comparing to protection and control applications, the Sampled Value service message structure is introduced to improve efficiency. At last, the power quality monitoring server having various power quality analysis functions is suggested to verify the performance of Merging Unit. With the diverse experiments, it is proved that the process bus distributed solution is flexible and economic for the power quality monitoring.

A Framework for Dynamic Growing of Web Service Applications based on ESB and Agent (웹 서비스 애플리케이션의 동적 성장을 위한 ESB와 에이전트 기반 프레임워크)

  • Lee, Chang-Ho;Kim, Jin-Han;Lee, Jae-Jeong;Lee, Byung-Jeong
    • The KIPS Transactions:PartA
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    • v.14A no.7
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    • pp.409-420
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    • 2007
  • Software adaptation may be required to interact between heterogeneous platforms and to react to rapid change of environment in ubiquitous computing. Web service provides a way to use heterogeneous and distributed services or resources to utilize and organize them. But it is not easy to retrieve appropriate services when we search services because web service lacks of semantic information. Semantic web service provides additional information of services, but it does not support a method to match them in various ways. We can adapt and extend web applications by using web service, but a method for management and administration is still needed. Therefore in this paper, we propose a framework for dynamic growing of web service applications based on ESB(Enterprise Service Bus) and agent and provide a prototype to show its usefulness.

The Methodology for Interoperability between Agent Framework and Information Bus Adapter for Ubiquitous Computing Environments (유비쿼터스 컴퓨팅 환경을 위한 에이전트 시스템과 인포메이션 버스 어댑터간 상호 운용성을 위한 기법)

  • Park, Sang-Yong;Han, Seung-Wok;Youn, Hee-Yong
    • The KIPS Transactions:PartA
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    • v.13A no.6 s.103
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    • pp.495-500
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    • 2006
  • The role of autonomic and intelligent agents in various environments is getting more important as demand on ubiquitous computing grows. The agents exchange information using the ACL (Agent Communication Language) to autonomously solve the problems. In this paper we propose a way of efficient interoperability technique between the agent framework built based on the international standard FIPA(Foundation for Intelligent Physical Agents) and the CORBA event service-based information bus adapter developed by us. The design and implementation of EMTI (Efficient Message Transport Interface) allowing communication between the information bus adapter which is non-agent platform and JADE platform are presented and its performance is evaluated by letting them exchange a large amount of messages.

Performance and parameter region for real time use in IEEE 802.4 token bus network

  • Park, Hong-Seong;Kim, Deok-Woo;Kwon, Wook-Hyun
    • 제어로봇시스템학회:학술대회논문집
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    • 1991.10b
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    • pp.1805-1810
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    • 1991
  • This paper derives the upper and the lower bound of the mean cycle time and the mean service time of the class 6 and the class 4, within which the minimum utilization constrain of the class 4 is guaranteed. Also, derived are conditions under which the token bus network is stable or unstable. These bounds and stable conditions are represented in terms of the high priority token hold time, the token rotation time and the arrival rate and the total station number etc. This paper suggest a parameter tuning algorithm in a partially symmetric token bus network with two classes, which maximizes the token rotation time for a suitable high priority token hold time and at the same time meets the stability condition of the network, the real time constraint and the minimum utilization constraint of the class 4.

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Comparative Analysis of Urban Public Transportation Systems with Emphasis on Subway-Feeder Bus System

  • Lee, Seung-Hawn
    • Journal of Korean Institute of Industrial Engineers
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    • v.4 no.1
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    • pp.33-47
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    • 1978
  • This paper attempts to develop a method which combines a subway system with a feeder bus system in order to increase the efficiency of the performance of the subway system. The 'feasible region' where a subway system is more desirable than a conventional bus in its travel time far the CBD-bound trip is determined and the service-specification models of the two systems in this region have been formulated and analyzed in an aggregate manner. The model developed in this study is applied to the Subway Line No. 1 in Seoul. The result obtained in the analysis indicates that the combined system can be guaranteed as a desirable mode in the point of travel time and cost within the feasible region. The concept of the model will lead to a proper assessment of the system's potentials for the choice of an optimal combination of the existing transport technologies.

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Study on Traffic Convenience of Aged People with Mobility Disadvantage: Focusing on Hanam-eup, Miryang-city, Gyeongsangnam-provance

  • In-Ja Lim;Seong-Hak Kim;Kyong-Jin Park
    • Journal of the Korean Society of Industry Convergence
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    • v.26 no.4_1
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    • pp.537-543
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    • 2023
  • According to the statistics, Korea is expected to reach a super-aged society in 2025. In preparation for an aging society, The government is making efforts to improve in social activity and welfare for the elderly people. But in case of people who live in urban-rural mixed cities, They can not benefit from traffic convenience that is essential in social activities. For example, surveys and interviews show that, The dwellers(65+ of some urban-rural mixed cities) have many restrictions on social activities because of mobility disadvantage. Therefore, We propose that expansion for the people who need to use the voucher taxi, Increase of the public bus service and rebuilding of the bus stop terminal. We are looking forward to this study will be used as basic data for transportation policy of urban-rural mixed cities across the country.

Building Smarter City through Big Data - Best Practices in Seoul Metropolitan Gov.

  • Kim, Ki-Byoung
    • International conference on construction engineering and project management
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    • 2015.10a
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    • pp.19-20
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    • 2015
  • Since 2013, Seoul Metropolitan Government (SMG) has introduced big data initiatively in administration and put into practices in transportation, safety, welfare in order to overcome limited resources and conflicting interests. For establishing a new midnight bus service, SMG prepared optimized midnight bus routes by analyzing big data from mobile phone Call Data Record (CDR) through collaboration with a telecommunication company. Despite of limited budget and resources, newly identified routes can cover over 42% of the citizen with 9 routes and less than 1% of buses compare with day time operation. In addition to solve transportation problem, SMG utilizes big data to resolve location selection problem for choosing new facility locations such as life double cropping centers and senior citizen leisure centers. As results, SMG demonstrates big data as a good tool to make policies and to build smarter city by overcome space-time limitation of resources, mediation of conflicts, and maximizes benefit of the citizen.

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