• Proceedings of the Korea Society for Simulation Conference
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• 1999.04a
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• pp.152-157
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• 1999

In this paper, we introduce the concept of web-based simulation and some reviews on the distributed simulation on the World Wide Web (WWW) and classify the features of current web-based simulation under the distributed way. And then we suggest the structure of distributed web-based simulation which can achieve parallel simulation and reduce simulation run time and show how the callback mechanism works to enable the distributions of jobs to clients with push service in Remote Method Invocation (RMI). Finally we present a prototype of distributed web-based simulation.

• Proceedings of the Korean Information Science Society Conference
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• 2003.10a
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• pp.808-810
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• 2003

정보보호 기능을 필요로 하는 각종 응용분야에서 다양한 보안 API가 사용되고 있다. 그러나 이러한 표준은 서로 호환성을 가지고 사용될 수 있는 것이 아니라 애플리케이션의 적용환경이나 프로그래밍 언어에 따라서 개발자가 선택적으로 이용해야 하는 단정을 가지고 있다. 이를 해결하기 위하여 정보보호 서비스컴포넌트 표준화를 진행하고 있으며 표준안의 유효성을 검증하기 위하여 비밀성, 무결성 컴포넌트 인터페이스를 통한 SSL(Secure Sockets Layer)을 구현하였다. 구현된 SSL은 TCP/IP 위에 하나의 단계를 추가하여 보안 알고리즘을 구현하는 것처럼 실제 컴포넌트간에 RMI(Remote Method Invocation)로 통신을 할 때, 각각 하위 수준의 SSL 컴포넌트를 이용하는 구조이다.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.60 no.1
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• pp.167-173
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• 2011

Most of the terminologies used in medical domain is not intended to be applied directly in clinical setting but is developed to integrate the terms by defining the reference terminology or concept relations between the terms. Therefore, it is needed to develop the subsets of the terminology which classify categories properly for the purpose of use and extract and organize terms with high utility based on the classified categories in order to utilize the clinical terms conveniently as well as efficiently. Moreover, it is also necessary to develop and upgrade the terminology constantly to meet user's new demand by changing or correcting the system. This study has developed a mapping tool that allows accurate expression and interpretation of clinical terms used for medical records in electronic medical records system and can furthermore secure semantic interoperability among the terms used in the medical information model and generate common terms as well. The system is designed to execute both 1:1 and N:M mapping between the concepts of terms at a time and search for and compare various terms at a time, too. Also, in order to enhance work consistency and work reliability between the task performers, it allows work in parallel and the observation of work processes. Since it is developed with Java, it adds new terms in the form of plug-in to be used. It also reinforce database access security with Remote Method Invocation (RMI). This research still has tasks to be done such as complementing and refining and also establishing management procedures for registered data. However, it will be effectively used to reduce the time and expenses to generate terms in each of the medical institutions and improve the quality of medicine by providing consistent concepts and representative terms for the terminologies used for medical records and inducing proper selection of the terms according to their meaning.

• Proceedings of the Korean Society of Computer Information Conference
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• 2011.01a
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• pp.15-18
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• 2011

현재 컴퓨팅 환경은 분산, 이동, 유비쿼터스 컴퓨팅 환경으로 진화되고 있다. OSGi는 유비쿼터스 환경에서 디지털 이동 전화, 차량, 임베디드 가전, 가정용 게이트웨이, 데스크탑 컴퓨터, 고성능 서버에 이르기까지 그 적용범위가 확대되고 있다. 따라서 서로 다른 장비에 탑재된 OSGi 프레임워크의 서비스들을 서로 연동하여 원격 OSGi 서비스들을 공유하여 상호 운용할 수 있는 기술이 필요하게 되었다. 본 논문에서는 분산 OSGi 프레임워크에서 원격 서비스의 상호운용을 지원하기 위하여 분산 미들웨어 기술인 RMI 패러다임을 적용한 원격 OSGi 서비스 상호운영 방안을 제안한다. 제안하는 원격 OSGi 서비스 상호운용 방안은 OSGi 표준 기술을 활용 및 확장하여 OSGi 아키텍처에 부합하는 원격서비스의 등록 및 발견, 접근 방법을 제공한다. 또한 동적으로 프락시 번들 및 프락시 서비스를 생성함으로써 원격 OSGi 서비스의 위치 투명성을 지원하는 특징을 가진다.

• Proceedings of the Korean Information Science Society Conference
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• 1998.10a
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• pp.715-717
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• 1998

인터넷이 급속도로 발전하여 이러한 환경에서 네트워크 연결된 여러 호스트들의 자원을 이용하는 시도가 활발하게 이루이지고 있다. 본 논문은 이러한 환경에서 의뢰인-병렬처리서버-작업자 구성을 이용하여, 작업자 애플릿을 임의의 호스트에 분산시키고, 대량의 연산 수행을 지닌 작업을 배분하여 수행시틴 뒤, 그 결과를 의뢰인에게 보여주는 WWW기반 자바 병렬 시스템의 설계 및 구현에 관하여 기술한다. 성능 향상을 위해서 자바의 원격 메소드 호출(Remote Method Invocation)을 이용한 애플릿간 통신 메커니즘을 구현하고, 작업자의 결과를 의뢰인에게 서버를 거치지 않고 곧바로 보내도록 한다. 또한 각 작업자마다의 성능비를 분석하여 태스크들을 할당하는 방법을 통해 작업 시간을 단축시킨다. 이 시스템에 연산 수행량이 많은 프랙탈 이미지 처리 작업을 배분하여 수행시키고, 작업 태스크의 크기에 따른 수행성능과 작업 배분방법에 따른 수행성능을 측정하여 그 결과를 비교, 제시한다.

• Proceedings of the KSME Conference
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• 2001.06e
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• pp.488-493
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• 2001

This paper introduces some useful Java technologies for utilizing the Internet in numerical analysis, and suggests one architecture performing efficient numerical analysis in the Intranet by using them. The present work has verified it's possibility by implementing some parts of this architecture with two easy examples. One is based on Servlet-Applet communication, JDBC and Swing. The other is adding multi-threads, file transfer and Java Remote Method Invocation to the former. Through this work it has been intended to make the base for the later advanced and practical research that will include efficiency estimates of this architecture and deal with advanced load balancing.

• 제어로봇시스템학회:학술대회논문집
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• 2000.10a
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• pp.118-118
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• 2000

This paper suggests the methodology to guarantee the rea1-time service over Ethernet and TCP/IP and to solve the problems such as re-transmission due to collision and platform-transparency and independence. This paper proposes a new mechanism called Real-time Ethernet protocol combined the centralized medium control mechanism with the token passing mechanism. The centralized medium control mechanism is used to get the token, the right to transmit the data, and the token passing mechanism is used to return the token to the token controller and to transmit data within the specified time interval. The proposed Real-Time Ethernet Protocol is based on Java and Java RMI(Remote Method Invocation). The presented protocol is believed to work enough in real-time applications considering latency occurred due to the Java RMI, which is less small than data transmission time.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.4 no.6
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• pp.1237-1252
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• 2010

This paper proposes an intelligent technique for data sharing and event transition among personal devices including smart phones, laptops, and desktops. We implemented the PES (Personal Event Service) system that proactively executes appropriate tasks across multiple devices without explicit user requests by sharing the data used by the user and recognizing user intention based on the observed actions of the user for specific devices. The client module of PES installed on each device monitors the user actions and recognizes the intention of the user. The server provides data sharing and maintenance for clients. The connection between client and server is established by Java RMI (Remote Method Invocation). A series of experiments were performed to evaluate user satisfaction and system accuracy, and the results showed that the PES system can proactively provide appropriate, personalized services with a high degree of satisfaction to the user in an effective and efficient manner.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.04b
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• pp.1223-1226
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• 2002

자바 카드 기술은 자바 기술을 스마트 카드에 최적화시키면서 자바 카드 플랫폼을 상위 자바 플랫폼에 접합시키는 방향으로 발전하고 있는 추세이다. 최근 발표된 SUN의 자바 카드 2.2 에서 지원되는 카드(서버)와 카드 리더(클라이언트)간의 원격 메소드 호출 인터페이스가 대표적인 예이다. 자바의 원격 메소드 호출은 서버와 클라이언트간의 상호 정의된 원격 객체의 메소드 호출에 대한 인터페이스를 제공하여, 다른 주소에 존재하는 자바 가상 기계들 사이에 메소드 호출이 가능하게 하는 것이다. 본 논문에서는 자바 카드에서의 원격 메소드 호출 인터페이스에 대해 살펴보고 구현 및 이용 방법에 대해서도 살펴보고자 한다.

• Journal of KIISE:Computing Practices and Letters
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• v.6 no.2
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• pp.120-134
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• 2000

In this paper we present a Distributed Object oriented Virtual computing Environment, called DOVE which consists of autonomous distributed objects interacting with one another via method invocations based on a distributed object model. DOVE appears to a user logically as a single virtual computer for a set of heterogeneous hosts connected by a network as if objects in remote site reside in one virtual computer. By supporting efficient parallelism, heterogeneity, group communication, single global name service and fault-tolerance, it provides a transparent and easy-to-use programming environment for parallel applications. Efficient parallelism is supported by diverse remote method invocation, multiple method invocation for object group, multi-threaded architecture and synchronization schemes. Heterogeneity is achieved by automatic data arshalling and unmarshalling, and an easy-to-use and transparent programming environment is provided by stub and skeleton objects generated by DOVE IDL compiler, object life control and naming service of object manager. Autonomy of distributed objects, multi-layered architecture and decentralized approaches in hierarchical naming service and object management make DOVE more extensible and scalable. Also,fault tolerance is provided by fault detection in object using a timeout mechanism, and fault notification using asynchronous exception handling methods