• Journal of KIISE:Information Networking
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• v.30 no.3
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• pp.293-306
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• 2003

In recent years, distributed computing environments have been radically changing to a structure of global, heterogeneous, federative and wide-area systems. This structure's environments consist of a let of objects which are implemented on telecommunication network to provide a wide range of services. Furthermore, all of objects existing on the earth have the duplicated characteristics according to how to categorize their own names or properties. But, the existing naming or trading mechanism has not supported the binding services of duplicated objects, because of deficiency of independent location service. Also, if the duplicated objects which is existing on different nodes provide the same service, it is possible to distribute the client requests considering each system's load. For this reason, we designed and implemented a new model that can not only support the location management of replication objects, but also provide the dynamic binding service of objects located in a system with minimum overload for maintaining load balancing among nodes in wide-area object computing environments. Our model is functionally divided into two parts; one part is to obtain an unique object handle of replicated objects with same property as a naming and trading service, and the other is to search one or more contact addresses by a location service using a given object handle. From a given model mentioned above, we present the procedures for the integrated binding mechanism in design phase, that is, Naming/Trading Service and Location Service. And then, we described in details the architecture of components for Integrated Binding Service implemented. Finally, we showed our implement environment and executing result of our model.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.40 no.4
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• pp.709-719
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• 2015

This paper introduces a proper renaming service using variable action and security services against the analysis techniques in Java code. The renaming service that is introduced is separated into API pattern and loop condition. We present our scheme algorithm with known Java obfuscation techniques and tools in order to help readers understanding, and implement prototype to prove practicality in this paper. Test result using prototype shows 73% successful variable renaming rate. Using our scheme, cooperators can intuitionally understand all of code. Also, It helps malware analysts to predict malware action by variable name. But application source code that is developed by Java is exposed to hackers easily using our scheme. So we introduce Java application code protection methods, too.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 1999.11a
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• pp.406-410
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• 1999

This paper supposes the SNMP network management system based upon Mobile Agent using the Naming and Directory Service, which is JNDI(Java Naming Directory Interface) technology. The Mobile Agent network system is expected to provide a solution for the conventional centralized network system. So, We have designed and implemented the network management system based upon Mobile Agent using JNDI

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.11
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• pp.3183-3192
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• 2009

The purpose of this paper is to introduce Naming application model for sensor networks. Currently, sensor networks comprised of sensor nodes have provided an application range which could not function before. However, unlike general network, current sensor networks are designed to cooperate with major wireless-capable sensor devices with limited resources. Thus, exporting/importing between individual sensor and current sensor networks is very inefficient and unstable. Attribute, schema and DIT(Directory Information Tree) must be designed for sensor network using SN LDAP application model in order to maintain transparency and provide constant service in a situation of data defect. With the system explained as above, Naming application model is made to manage SN Fuzzy Query. It shall be more efficient and stable structure as long as Naming application using a virtual equation in a certain environment with information collected from sensor node is provided. In this paper, I would like to introduce SN Fuzzy LDAP model for sensor network by quick Naming method. Also, naming application which is possible for fuzzy query in a certain environment based on the system will be proved.

• Proceedings of the Korea Information Processing Society Conference
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• 2001.04a
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• pp.287-290
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• 2001

최근의 급속한 인터넷 성장에 힘입어 분산처리의 기술 및 환경은 인터넷을 기반으로 광역환경으로 확장될 전망이다. 이러한 환경은 사용자에게 보다 투명한 분산객체간의 효율적인 상호접속이 요구될 뿐 아니라, 광역환경에서 이름이나 속성에 의해 다양한 중복된 성질을 갖고 있는 객체들의 관리가 요구된다. 또한 광역 분산 환경에서 최적의 객체를 선정하는데 분산된 시스템들간의 부하분배를 고려하여 투명성을 제공하는 메카니즘이 필요하게 된다. 따라서, 본 논문에서는 광역분산 컴퓨팅 환경에서 광역 서비스를 지원할 수 있는 이름/속성기반의 중복객체들을 관리를 위한 통합 트리 구성방법을 제안한다. 그리고 이를 통한 혼합(네이밍/트레이더)된 위치서비스(Location service)를 이용하여 무수히 산제한 중복된 분산 객체들을 효율적으로 유지하고, 최적의 객체 선정을 통해 부하균형을 유지할 수 있는 방안을 제시한다.

• The Magazine of the IEIE
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• v.24 no.8
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• pp.46-54
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• 1997

• The KIPS Transactions:PartC
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• v.8C no.1
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• pp.23-31
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• 2001

Current CORBA has been suggested a solution for complexity of software in distributed environment. But it can't provide reliability about data transfer. For instance, CORBA can't provide object to client when the network are unstable or congested. In an existing CORBA, client has to wait when there is congestion between client and object implementation while client get a service from object implementation. So In this paper, we propose Fault-Tolerant CORBA Service (FTS) which has an intelligent redirection about an object that client requests. Moreover, we designed and implemented Fault-Tolerant Service to provide reliability by extending existing CORBA ORB. Therefore it provides reliable connection throughout the proposed Fault-Tolerant Service.

• Proceedings of the Korean Information Science Society Conference
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• 2002.10e
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• pp.226-228
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• 2002

본 논문에서는 효율적인 통신 시스템용 미들웨어 개발을 위한 3가지 방법을 나타낸다 첫째, 동일 호스트상에서 메시지 전달 오버헤드를 최적화하기 위해 공유 메모리 기반의 연동 프로토콜을 제시한다. 둘째, 미들웨어 플랫폼의 신뢰성을 향상시키기 위해, 구현 객체 데이터베이스를 이용한 네이밍 서비스 서버 구현 방법을 제시한다. 셋째, 시스템이 운용중인 상태에서 새로운 서비스 모듈의 추가나 기존 모듈의 기능 변경이 필요한 경우 서비스를 중단하지 않고 컴퍼넌트를 실행 중에 동적으로 재구성하는 방안을 제시한다. 이를 통해 통신 시스템용 미들웨어의 성능이 향상됨을 나타냈다.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.04a
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• pp.537-539
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• 2012

센서네트워크 환경에서 이동 에이전트의 효율적 이주를 위하여 센서네트워크 구성 요소 관련 데이터들을 수집 및 저장하여 일관된 네이밍 서비스를 제공해야 할 필요가 있다. 본 논문에서는 이러한 다양한 데이터들을 저장하기 위한 메타테이블을 설계 구현하고, 메타테이블 내의 정보들을 이용한 네이밍 기법을 적용하여 이동 에이전트의 이주 및 규칙실행 방법을 제안한다. 또한 조도 데이터를 이용한 인접노드를 제어하는 규칙실행을 실험을 통하여 보임으로써 센서네트워크 미들웨어의 유효성과 응용 가능성을 제시한다.

• Proceedings of the Korean Information Science Society Conference
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• 1998.10a
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• pp.190-192
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• 1998

이동에이전트를 위한 이동객체(mobile agent)와 이를 지원해주는 이동객체서버(mobile object system)를 설계하고 이러한 요소들을 제어하고 관리하는 이동객체 시스템(mobile object system)을 Java로 구현한다. 또, 시스템 내의 이동객체를 비롯한 모든 객체들간의 객체 요청(object request)을 유연하게 중계하고 이들간의 통신을 담당하는 ORB (Object Request Broker)를 TCP/IC상에서 Java 로 구현하고 이동 에이젼트 시스템을 쉽게 구측할수 있는 앱스트랙션(abstraction)과 API를 제공한다. 이 시스템은 네이밍 서비스(naning service)와 푸쉬형 이벤트 서비스(push-event service)등을 기본적으로 지원한다.