• Journal of Digital Contents Society
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• v.3 no.2
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• pp.235-243
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• 2002

This paper explains the design and implementation of the ESA(Error Sharing Agent). ESA is a system that is suitable for detecting, sharing and recovering software error based on multimedia CSCW(Computer Supportes Cooperated Work). This system consists of an ED, ES, and ER. ED detects an error by hooking techniques. ES is an agent which is an error sharing system for distributed multimedia collaboration environment With error sharing system, a group cooperating users can share error applications. From the perspective of multimedia collaborative environment, an error application becomes another interactive presentation error is shared with participants engaged in a cooperative work. We propose how an error application can be treated as 'media' in a multimedia collaborative environment.

• Journal of Korea Game Society
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• v.2 no.2
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• pp.37-45
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• 2002

Computer games could be regarded as simulation of the real world. Control problems of software agents have long been studied in the field of Artificial Intelligence (AI), resulting in giving a birth to the behavior-based approach. three main approaches might be categorized out of the history of AI study. First, Cognitivists propose that intelligence could be represented and manipulated in terms of symbols. Second, Connectionists claim that symbols could not be isolated but they are embedded in the body structure. Third, the behavior-based approach is an approach to AI which suggests that intelligence is dynamic property that exists nowhere but emerges in the relationship of an agent and the world including observers while the agent performs behavior. This paper explains and compares the three approaches to AI, then discusses the plausibility of the behavior-based approach and problems. Finally, this paper proposes application of behavior-based approach to computer games in terms of agent control.

• Journal of Korea Multimedia Society
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• v.8 no.5
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• pp.707-741
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• 2005

In the multimedia streaming technology, the unicast method require additional cost by an increase traffic according to increase a number of users. The multicast method can solve this problem, but it don't have connection and control information of clients. Now, the most routers support only unicast. Also it has a problem with an exchange of service in other ISP. This paper proposes traffic agent system which is applied unicast and P2P(Peer to Peer) for distance video teaming to overcome this problem. The proposed system decrease the traffic of stream server by control agent, and cut down expenses of network. This system is tested under the distance video leaning using JMF and application software.

• Journal of KIISE:Software and Applications
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• v.32 no.11
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• pp.1084-1098
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• 2005

In this paper, we propose a migration technique for autonomous mobile agents suitable to dynamic environments. The proposed migration technique dynamically creates the itinerary of agents that considers states of networks and systems. In the migration of the agent, it first sends prefetching message to the next system. The system receives necessary data for migration in advance. Through this, we reduce the amount of the sending data and save the time for creating the instance of the agent. And it improves the execution efficiency by using the checkpoint-based recovery method that does not execute the agent again and recovers the process states even though the errors take place. To show superiority of the proposed technique, we compare the proposed method with the existing methods through various simulations.

• Journal of Internet Computing and Services
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• v.11 no.1
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• pp.103-116
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• 2010

In this paper, we propose an optimal camera placement using agent-based simulation. To derive importance of space and to cover the space efficiently, we accomplished an agent-based simulation based on classification of space and pattern analysis of moving people. We developed an agent-based camera placement method considering camera performance as well as space priority extracted from path finding algorithms. We demonstrate that the method not only determinates the optimal number of cameras, but also coordinates the position and orientation of the cameras with considering the installation costs. To validate the method, we compare simulation results with videos of real materials and show experimental results simulated in a specific space.

• Journal of KIISE:Software and Applications
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• v.30 no.7_8
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• pp.672-680
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• 2003

A shopbot is a software agent whose goal is to maximize buyer´s satisfaction through automatically gathering the price and quality information of goods as well as the services from on-line sellers. In the response to shopbots´ activities, sellers on the Internet need the agents called pricebots that can help them maximize their own profits. In this paper we adopts Q-learning, one of the model-free reinforcement learning methods as a price-setting algorithm of pricebots. A Q-learned agent increases profitability and eliminates the cyclic price wars when compared with the agents using the myoptimal (myopically optimal) pricing strategy Q-teaming needs to select a sequence of state-action fairs for the convergence of Q-teaming. When the uniform random method in selecting state-action pairs is used, the number of accesses to the Q-tables to obtain the optimal Q-values is quite large. Therefore, it is not appropriate for universal on-line learning in a real world environment. This phenomenon occurs because the uniform random selection reflects the uncertainty of exploitation for the optimal policy. In this paper, we propose a Mixed Nonstationary Policy (MNP), which consists of both the auxiliary Markov process and the original Markov process. MNP tries to keep balance of exploration and exploitation in reinforcement learning. Our experiment results show that the Q-learning agent using MNP converges to the optimal Q-values about 2.6 time faster than the uniform random selection on the average.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.12 no.6
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• pp.33-42
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• 2012

Rapid evolution of wired and wireless technologies results in various types of embedded systems, and the software to be embedded into those devices now needs the flexibility rather than the fixedness which was well-known property for the embedded software in the past. Mobile agent is one of the useful distributed technologies of reducing network load and latency because of its disconnected operations and high asynchrony. In this paper, a component-based mobile agent framework, called EmHUMAN, is designed and implemented for structural embedding into the devices showing different functions and resource constraints. It consists of 3 layers of components. Based on those components, a structural embedding, considering resource constraints of required functions, amount of storage space, computing power, network bandwidth, ${\ldots} $ etc can be performed. The components in each layer can be extended with addition of new components, removing some components and modifying components. EmHUMAN plays the role of a framework for developing mobile agent based distributed systems. It is also a mobile agent system by itself. EmHUMAN provides several utilities as built-in API's, and thus high effectiveness in programming mobile agents can be achieved.

• Journal of KIISE:Software and Applications
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• v.27 no.12
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• pp.1183-1192
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• 2000

기존의 휴대정보단말 사용자는 단말 소프트웨어의 특성 상 웹을 통해 게시되는 소프트웨어 정보를 계속해서 모니터링하고, 필요한 소프트웨어를 직접 단말에 다운로딩하는 단순 반복 작업을 계속해야 한다. 이는 컴퓨터 비전문가인 일반 사용자가 활용하기에는 어려운 점이 있으며, 뿐만 아니라, 단말기에 익숙한 사용자에게도 새로운 소프트웨어 정보를 계속해서 모니터링하여 획득 및 활용하기에는 많은 오보헤드가 필연적으로 따르게 된다. 본 논문에서는 사용자가 별도의 추가 작업을 하지 않아도 늘 가장 최신의 소프트웨어가 자신의 단말에 자동으로 업그레이드 되고, 관심 있는 응용 소프트웨어가 릴리즈 될 때 마다 실시간으로 이 정보를 알려주고 사용자가 원한다면, 자동으로 설치 작업까지 해서 곧바로 소프트웨어를 이용할 수 있다록 하는 ‘에이전트 기반의 유대정보단말용 소트프웨어 자동 설치 시스템’에 관하여 기술한다. 본 시스템은 유동적인 웹 환경과 다양한 휴대정보단말을 고려하여 실행시간(Runtime)에도 새로운 기능 추가가 가능하며, 동일한 통신 언어를 통해 개발 플랫폼이 서로 상이한 에이전트간에도 협동 작업이 가능하도록 하는 멀티 에이전트 기반 구조인 OAA(Open Agent Architecture)상에서 구현하였다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 1999.06a
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• pp.11-14
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• 1999

The forthcoming century will be the "era of cyber society" . In a virtual environment, a cyber character plays the role of an agent for the human being. In this paper, we introduce active researches of industries, universities, and research institutes in Korea. After Adam Soft Inc. presented a cyber singer,“Adam”, a few cyber characters have succeeded commercially through Internet, TV, CF, movies and etc. Some universities had their own characters to make fundamental researches in the fields of modeling, motion control, and VR. Research institutes have been funded recently to a cyber character related researches. This paper briefly reviews the recent research works, and future trends in Korea. in Korea.

• Proceedings of the Korean Information Science Society Conference
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• 2007.10b
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• pp.72-77
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• 2007

최근 네트워크 환경이 점차 복잡해지고 동적으로 변화함에 따라서 이러한 에드혹 네트워크 환경을 지원하기 위한 에이전트 플랫폼에 관한 연구가 진행되고 있다. 그러나 기존 에드혹 네트워크 환경을 지원하는 에이전트 플랫폼은 플랫폼의 경량화에는 성공하였지만 FIPA에서 제안하는 에이전트 플랫폼의 표준안을 만족시키는 다양한 기능을 제공하지 못한다. 이것은 다른 에이전트 기반 시스템들과의 상호 운용성을 떨어트린다. 본 논문에서는 FIPA에서 제안하는 기능을 만족시키면서, 보다 빠른 서비스 제공 및 경량화된 에이전트 플랫폼을 설계 및 구현하였다. 본 논문에서 제안하는 에이전트 플랫폼은 FIPA 표준안을 만족시키기 때문에 에드혹 네트워크 환경뿐만 아니라 범용적인 네트워크 환경에서도 동작 가능하고, 플랫폼의 경량화된 특성으로 인하여 PDA와 같은 모바일 기기에도 이식하여 사용할 수 있다. 본 논문에서는 에드혹 네트워크 환경을 지원하는 에이전트 플랫폼을 설계 및 구현하였으며 동적 및 정적 네트워크 환경의 효과적인 적용 및 에이전트 플랫폼이 구동 불가능 단말기에서의 구동여부를 평가하여 그 유효성을 검증하였다.