• Proceedings of the Korean Operations and Management Science Society Conference
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• 2006.05a
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• pp.341-347
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• 2006

생산 현장의 문제들을 극복하기 위한 MES(Manufacturing Execution System)는 공장내의 각종 업무가 일사천리로 진행하도록 조력하는 시스템이다. 하지만 현실적으로 현장 상황에 대한 실시간적인 집계가 이루어지지 않고 있어 기업의 생존전략인 생산성 증대, 자동화, 표준화, 정보화가 이루어지지 않고 있는 실정이다. 이를 극복하기 위해서 최근 주목을 받고 있는 RFID(Radio-Frequency Identification)을 이용하고자 한다. 본 논문에서는 실시간으로 제조현장에서 발생하는 Resource, Product, Process에 대한 모든 정보를 수집하고, 이를 제조실행 시스템에서 이용할 수 있도록 하는 Agent 기반의 RFID 미들웨어의 역할과 구조에 대해 설명하였고 Agent 기반으로 인해 내부 인터페이스 및 외부의 정보서비스 영역에서의 다양한 상황에 유연하게 대처할 수 있는 방법에 대해 서술하였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2012.10a
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• pp.934-937
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• 2012

Since a migration method of the mobile agent is a factor that affects the overall performance of the entire distributed system, it is necessary to find efficient migration methods of the mobile agent within the sensor network using the various metadata related on the sensor network. Accordingly, this paper proposes the directional(forward and backward) migration methods of an active rule mobile agent applying the naming method that used the information of the meta_table. The results of the various experiments in this study present the efficacy of mobile agent middleware system and the possibility of constructing efficient sensor network application environment.

• Journal of the Korea Society of Computer and Information
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• v.25 no.5
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• pp.91-98
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• 2020

The mobile agent, which handles a given task while migrating between the sensor nodes, moves including the execution commands and task processing results. This increases the size of the mobile agent, causing the network to load, leading to the migration time delay and the loss of migration reliability. This paper presents the method of lightening the mobile agent using distributed object technology and the algorithm for exploring and providing the optimal migration path that is actively performed in the event of network traffic, and it proposes a method to ensure the reliability of the mobile agent migration by applying them. In addition, through the comparative analysis experiments based on agent size and network traffic for the migration time of mobile agent equipped with active rules in sensor network-based mobile agent middleware environment, applying the proposed methods proves to ensure the autonomy and migration reliability of the mobile agent.

• Proceedings of the Korea Information Processing Society Conference
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• 2013.05a
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• pp.153-154
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• 2013

많은 과학 분야에서 필수적인 요소인 High-performance computing 은 많은 컴퓨팅 자원을 필요로 한다. 이에 인터넷을 통해 사용자가 필요한 만큼의 컴퓨팅 자원을 제공받고 사용량만큼 비용을 지불할 수 있는 클라우드 컴퓨팅이 하나의 해결책으로 제시된다. 하지만 클라우드 컴퓨팅을 사용하기 얼마만큼의 자원이 필요할 것인가를 결정하는 문제가 있다. 본 논문에선 동적인 클라우드 서비스 환경에서 사용자가 실행하고자 하는 특정 어플리케이션에 대해 쓸모 없는 자원을 최대한으로 줄여 비용 대비 성능의 자원을 제공하는 브로커를 제안한다.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2003.05a
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• pp.808-813
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• 2003

Maintaining agility and responsiveness m designing and manufacturing activities are the key issues for manufacturing companies to cope with global competition. Distributed design and control systems are regarded as an efficient solution for agility and responsiveness. However, distributed nature of a manufacturing system complicates production activities such as design, simulation, scheduling, and execution control. Especially, existing simulation systems have limited external integration capabilities, which make it difficult to implement complex control mechanisms for the distributed manufacturing systems. Moreover, integration and coupling of heterogeneous components and models are commonly required for the simulation of complex distributed systems. In this paper, a collaborative and adaptive simulation architecture is proposed as an open framework for simulation and analysis of the distributed manufacturing enterprises. By incorporating agents with their distributed characteristics of autonomy, intelligence, and goal-driven behavior, the proposed agent-based simulation architecture can be easily adapted to support the agile and distributed manufacturing systems. The architecture supports the coordination and cooperation relations, and provides a communication middleware among the participants in simulation.

• 전자공학회논문지 IE
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• v.44 no.4
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• pp.11-18
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• 2007

Concept of URC does "with me wherever when, and the robot" which provides necessary service to me can be simply defined. This paper uses URC technology and various robots are implemented with a design. That is, we are going to implement that a user controls a virtual robot by communication between URC server with a design. We used an intelligent robot simulation tool, and a developer was easy, and it was intelligent, and we were connected to active URC server, and modeling did a system for simulation to be able to do an URC robot usefully. It was connected to an URC system and various robots and environments were composed with 3D, and, in this paper, a design and implementation did an intelligent robot simulation system so that it was possible by various contents development through simulation. The URC communication protocol and the URC server were based on a Planet v.1.2 ; Network Protocol, CAMUS(Context-Aware Middleware for URC Systems); URC Server, SAM(Service Agent Manager) v.1.2 ; Service API module developed in Electronics & Telecommunications Research Institute (ETRI).

• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.7
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• pp.1567-1574
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• 2012

Since a migration method of the mobile agent is a factor that affects the overall performance of the entire distributed system, it is necessary to find efficient migration methods of the mobile agent within the sensor network and to collect and store data related to various components(server, sink and sensor node) of the sensor network, thereby providing consistent naming services. Accordingly, this paper presents design and implementation of MetaTable that is divided into MetaData where information on the sensor data server is stored and SubMetaData where various types of information on sink nodes and data on sensor nodes connected with the sink nodes is stored. Moreover, the paper also presented the implementation of forward migration of an active rule mobile agent applying the naming method based on RMI that used the meta_table and proposed the possibility of constructing efficient sensor network application environment. In this paper, for registration, release and retrieval methods suitable for new sensor network environment, we designed and implemented the naming agent by applying J2EE model based on RMI-IIOP(Internet Inter-ORB Protocol) technique.

• International Journal of Fuzzy Logic and Intelligent Systems
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• v.8 no.1
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• pp.42-51
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• 2008

We believe that smart spaces, offering pervasive services, will proliferate. However, at present, those islands of smart spaces should be joined seamlessly with each other. As users move about, they will have to roam from one autonomous smart space to another. When they move into the new island of smart space, they should setup their devices and service manually or not have access to the services available in their home spaces. Sometimes, there will conflicts between users when they try to occupy the same space or use a specific device at the same time. It will also be critical to elder people who suffer from Alzheimer or other cognitive impairments when they travel from their smart space to other visited spaces (e.g., grocery stores, museums). Furthermore our experience in building the Gator Tech Smart House reveals to us that home residents generally do not want to lose or be denied all the features or services they have come to expect simply because they move to a new smart space. The seamless inter-space interaction requirements and issues are raised automatically when the ubiquitous pervasive computing system tries to establish the user's service environment by allocating relevant resources after the user moves to a new location where there are no prior settings for the new environment. In this paper, we raise and present several critical inter-space interactions issues impacting middleware architecture design of ubiquitous pervasive computing. We propose requirements for resolving these issues on seamless inter-space operation. We also illustrate our approach and ideas via a service scenario moving around two smart spaces.

• Proceedings of the Korea Information Processing Society Conference
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• 2005.05a
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• pp.85-88
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• 2005

유비쿼터스 컴퓨팅 환경에서 분산되어 존재하는 서비스나 디바이스의 효과적인 사용을 위해서는 서비스의 종류나 서비스의 위치 등의 기본적인 정보가 사전에 제공되어야 한다. 이러한 기본 정보를 사용자의 요구에 맞게 정확히 탐색해서 찾아주는 일련의 과정을 서비스 디스커버리(Service Discovery)라 칭하며, 유비쿼터스 같은 분산 이동 환경에서 가장 먼저 구축되어야만 하는 시스템이다. 최근에는 발달된 에이전트 기술을 서비스 디스커버리와 접목시켜 분산되어 있는 서비스와 디바이스 그리고 사용자까지 효율적이고 유용성 있게 관리하는 추세이다. 각국의 기업이나 학교에서 수 많은 에이전트 플랫폼이 개발되어 왔지만, 각기 다른 개발 기준의 적용으로 인하여 에이전트 플랫폼 간의 상호운용(Interoperability)에 어려움이 존재한다. FIPA 에서는 이종 에이전트 플랫폼 간의 제공 서비스 상호운용을 위해서 디스커버리 미들웨어(Discovery Middleware) 모듈을 제안하였다. 본 논문에서는 FIPA-OS 와 JADE 그리고 SLP 플랫폼 들이 서로의 서비스를 공유할 수 있도록, FIPA 에서 제안한 디스커버리 미들웨어를 실질적으로 개발하여 상호간의 서비스 디스커버리가 이루어질 수 있도록 하였다.

• Journal of KIISE:Computing Practices and Letters
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• v.13 no.1
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• pp.59-73
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• 2007

Although there exist many middlewares such as Havi, Jini, LonWorks, UPnP, and SLP, new middlewares specialized for diverse information appliances are expected to appear continuously as home networks evolve. In this paper, we examine an integrated architecture for supporting interoperability among heterogeneous middlewares under home network, we also propose and implement a scenario-based user-oriented integrated architecture for efficient home automation which is different from existing methods. HOMI(Homenetwork Middleware for Interoperability) architecture proposed in this paper provides interfaces that assist users with designing and modifying desirable scenarios using a script interpreter language HOMIL(HOMI Language). Different from an existing integrated middleware architecture, HOMI improves efficiency and convenience of interoperation between heterogeneous appliances for home automation allowing users to design and organize scenarios through these interfaces. HOMI classifies interoperation services into time contort, synchronization context, and asynchronization context and helps to execute next services considering contexts when a specific event occurs. Applying modified scenarios immediately to home network environment, HOMI provides users with seamless services without installing new applications, updating the server, or rebooting in order to adopt new scenarios. Lastly, distribution agents into several devices, we solved the overhead problem occurred in a centralized architecture for integrated middleware.