• Title/Summary/Keyword: multiagent system

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A New Modified CNP for Autonomous Microgrid Operation Based on Multiagent System

  • Kim, Hak-Man;Wei, Wenpeng;Kinoshita, Tetsuo
    • Journal of Electrical Engineering and Technology
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    • v.6 no.1
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    • pp.139-146
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    • 2011
  • This paper presents a new modified Contract Net Protocol (CNP) for microgrid operation based on multiagent system. The CNP is a widely used protocol for interactions among distributed problem solving. The Contract Net Interaction Protocol of the Foundation for Intelligent Physical Agents (FIPA-CNIP) is a minor modification of the original CNP for multiagent system applications. In this paper, a modified CNP (MCNP) based on the FIPA-CNIP is proposed for more specialized interactions among agents for microgrid operation. A multiagent system is designed and constructed for microgrid operation. A microgrid operation based on the multiagent system is tested to check the functionality of the proposed MCNP.

A Multiagent System for Microgrid Operation in the Grid-interconnected Mode

  • Kim, Hak-Man;Kinoshita, Tetsuo
    • Journal of Electrical Engineering and Technology
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    • v.5 no.2
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    • pp.246-254
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    • 2010
  • This paper presents a multiagent system for microgrid operation in the grid-interconnected mode. An energy market environment with generation competition is adopted for microgrid operation in order to guarantee autonomous participation and meet the requirements of participants in the microgrid. The modified Contract Net Protocol (CNP) is used as a protocol for interactions among agents. The multiagent system for microgrid operation based on the modified CNP and the energy market environment is designed and implemented. To verify the feasibility of the suggested multiagent system, experiments on three operation conditions are carried out.

Talmudic Approach to Load Shedding of Islanded Microgrid Operation Based on Multiagent System

  • Kim, Hak-Man;Kinoshita, Tetsuo;Lim, Yu-Jin
    • Journal of Electrical Engineering and Technology
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    • v.6 no.2
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    • pp.284-292
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    • 2011
  • This paper presents a load-shedding scheme using the Talmud rule in islanded microgrid operation based on a multiagent system. Load shedding is an intentional load reduction to meet a power balance between supply and demand when supply shortages occur. The Talmud rule originating from the Talmud literature has been used in bankruptcy problems of finance, economics, and communications. This paper approaches the load-shedding problem as a bankruptcy problem. A load-shedding scheme is mathematically expressed based on the Talmud rule. For experiment of this approach, a multiagent system is constructed to operate test islanded microgrids autonomously. The suggested load-shedding scheme is tested on the test islanded microgrids based on the multiagent system. Results of the tests are discussed.

Key Distribution Process for Encryption of SCADA Communication using Game Theory applied Multiagent System

  • Kim, Hak-Man;Kang, Dong-Joo
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.23 no.11
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    • pp.34-43
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    • 2009
  • SCADA (Supervisory Control and Data Acquisition) system has been used for remote measurement and control on the critical infrastructures as well as modem industrial facilities. As cyber attacks increase on communication networks, SCADA network has been also exposed to cyber security problems. Especially, SCADA systems of energy industry such as electric power, gas and oil are vulnerable to targeted cyber attack and terrorism Recently, many research efforts to solve the problems have made progress on SCADA network security. In this paper, flexible key distribution concept is proposed for improving the security of SCADA network using Multiagent System (MAS).

A Ubiquitous Vision System based on the Identified Contract Net Protocol (Identified Contract Net 프로토콜 기반의 유비쿼터스 시각시스템)

  • Kim, Chi-Ho;You, Bum-Jae;Kim, Hagbae
    • The Transactions of the Korean Institute of Electrical Engineers D
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    • v.54 no.10
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    • pp.620-629
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    • 2005
  • In this paper, a new protocol-based approach was proposed for development of a ubiquitous vision system. It is possible to apply the approach by regarding the ubiquitous vision system as a multiagent system. Thus, each vision sensor can be regarded as an agent (vision agent). Each vision agent independently performs exact segmentation for a target by color and motion information, visual tracking for multiple targets in real-time, and location estimation by a simple perspective transform. Matching problem for the identity of a target during handover between vision agents is solved by the Identified Contract Net (ICN) protocol implemented for the protocol-based approach. The protocol-based approach by the ICN protocol is independent of the number of vision agents and moreover the approach doesn't need calibration and overlapped region between vision agents. Therefore, the ICN protocol raises speed, scalability, and modularity of the system. The protocol-based approach was successfully applied for our ubiquitous vision system and operated well through several experiments.

A Multiagent System for Workflow-Based Bioinformatics Tool Integration

  • Sohn, Bong-Ki;Lee, Keon-Myung;Kim, Hak-Joon
    • International Journal of Fuzzy Logic and Intelligent Systems
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    • v.3 no.2
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    • pp.133-137
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    • 2003
  • Various bioinformatics tools for biological data processing have been developed and most of them are available in public. Most bioinformatics works are carried out by a composite application of those tools. Several integration approaches have been proposed for easy use of the tools. This paper proposes a new multi agent system to integrate bioinformatics tools in the perspective of workflow since the composite applications of tools can be regarded as workflows. For the easy integration, the proposed system employs wrapper agents for existing tools, uses XML-based messages in the inter-agent communication, and agents are supposed to extract necessary information from the received messages. This allows new tools to be easily added on the integration framework. The proposed method allows various control structures in workflow definition and provides the progress monitoring capability of the on-going workflows. In particular, agents in this system have the rule-based architecture which allows the defined rule set to be a special role agent. This feature provides fast and flexible agent development to aid in managing the complexity of bioinformatics application. This system has been partially implemented and has been proven to be a viable implementation for workflow-based bioinformatics tool integration.

An Open Multiagent System Architecture based on Web Service Infrastructure (웹서비스 기반의 개방형 다중 에이전트 시스템 구조)

  • Hwang, Gyeong-Sun;Lee, Seung-Hui;Yang, Won-Seop;Lee, Geon-Myeong
    • Proceedings of the Korean Institute of Intelligent Systems Conference
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    • pp.3-6
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    • 2006
  • 분산 환경에서의 자원 및 서비스를 활용하여 응용 시스템을 구축하기 위한 패러다임으로서 다중 에이전트 구조가 많아 연구되어 왔다. 이 논문에서는 다양한 자원 및 서비스를 개방적으로 활용하기 위해, 웹서비스의 개방적인 환경을 활용하여 에이전트 및 웹서비스 객체를 효과적으로 이용할 수 있도록 하는 개방형 다중 에이전트 시스템 구조에 대해서 소개한다.

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Applying CSP techniques to automated scheduling with agents in distributed environment (분산 환경 하에서 지능형 에이전트 기반의 자동 스케줄링을 위한 제약만족 기법의 응용)

  • Jung, Jong-Jin
    • Journal of the Korea Industrial Information Systems Research
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    • v.12 no.1
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    • pp.87-94
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    • 2007
  • Many researchers have modeled complicated problems with distributed AI technologies in distributed environment. Especially, intelligent agent technology we often proposed among researchers as efficient method to solve the complicated problems because agent technology makes possibile to share different problem solving abilities among processors in distributed processing environment. In this paper, we propose multiagent system model to solve distributed scheduling problem. At this point we apple CSP techniques to the multiagent model as individual problem solving ability of member agents. Scheduling problem is divided into subproblems according to constraints by distributed resources, then each agent solves its subproblem using CSP solver in the proposed model. This method improves scheduling efficiency. For meeting scheduling problem of case study, we show CSP modeling process and suggest problem solving procedure by multiagent system model.

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Interaction Contortion a Distributed Multiagent System (분산 멀티에이전트 시스템의 상호협력 제어)

  • Baek, Sun-Cheol;Choe, Jung-Min;Im, Yeong-Hwan;Jang, Myeong-Uk;Park, Sang-Gyu;Lee, Gwang-Ro
    • The Transactions of the Korea Information Processing Society
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    • v.3 no.7
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    • pp.1803-1811
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    • 1996
  • In a distributed multiagent framework, the capabilities of each agent are known to other agents. Namely, each agent in a multiagent society is aware of what agents are available in the whole society, which is able to solve a query, and how to contact them. This characteristic leads to the simplicity in controling both local and remote interactions among agents by using a fixed form for communication packes. This paper presents methods for controlling interactions among agents in this distributed multiagent frame-work. Agent interactions are described within the platform of MASCOT that is a tightly coupled multiagent system developed for the role of a computer secretary. A frame-like form of a commumication packet is defined, and protocols for message exchanges are presented. Also, ascenarios given to demonstrate how the communication mechanism controls agent intercations in MASCOT.

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An Automatic Cooperative coordination Model for the Multiagent System using Reinforcement Learning (강화학습을 이용한 멀티 에이전트 시스템의 자동 협력 조정 모델)

  • 정보윤;윤소정;오경환
    • Korean Journal of Cognitive Science
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    • v.10 no.1
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    • pp.1-11
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    • 1999
  • Agent-based systems technology has generated lots of excitement in these years because of its promise as a new paradigm for conceptualizing. designing. and l implementing software systems Especially, there has been many researches for multi agent system because of the characteristics that it fits to the distributed and open Internet environments. In a multiagent system. agents must cooperate with each other through a Coordination procedure. when the conflicts between agents arise. where those are caused b by the point that each action acts for a purpose separately without coordination. But P previous researches for coordination methods in multi agent system have a deficiency that they can not solve correctly the cooperation problem between agents which have different goals in dynamic environment. In this paper. we solve the cooperation problem of multiagent that has multiple goals in a dynamic environment. with an automatic cooperative coordination model using I reinforcement learning. We will show the two pursuit problems that we extend a traditional problem in multi agent systems area for modeling the restriction in the multiple goals in a dynamic environment. and we have verified the validity of the proposed model with an experiment.

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