• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2022.06a
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• pp.435-437
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• 2022

스마트 해상물류 통합 프로세스 설계 기술을 위한 데이터 처리 연구는 스마트 해상 물류 통합을 위한 메시지 관리 패턴 정의로 해운-항만-내륙물류의 다양한 서비스와의 연계 데이터 관리 패턴 설계, 디지털 문서의 수용 및 데이터 교환을 위한 상호운용성 보완 기술 설계 그리고 프로세스 기반 거래검증 알고리즘에 대한 연구 내용이다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.12A
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• pp.1113-1121
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• 2010

The Vehicle Safety Communications (VSC) is one of VANET applications for preventing vehicle accidents, and it utilizes vehicle-to-vehicle communication to exchange emergency messages. To propagate such messages in VSC, several schemes based on selective flooding have been proposed. Their common idea is that an emergency message is relayed by one of vehicles receiving the message. However, the schemes do not consider the transmission errors and duplications of an emergency event. In the schemes, if there are transmission errors and a vehicle detects a hazard, there may be vehicles which fail to receive an emergency message. If k vehicles detect a hazard, k emergency messages are created and propagated. The duplications of an event increase reliability of the message delivery but decrease efficiency. In this paper, we propose an emergency message delivery scheme which is efficient and robust to transmission errors. Our proposed scheme utilizes clustering for massage aggregation and retransmissions in a cluster. It also uses an acknowledgment mechanism for reliable inter-cluster communication. Our simulation results show that the proposed scheme outperforms Least Common Neighbor Flooding which is one of the selective flooding schemes.

• Proceedings of the Korea Multimedia Society Conference
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• 2002.05d
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• pp.649-654
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• 2002

현재 많은 기업들은 수년에 걸쳐 많은 자원과 시간을 투자하여 JAVA, CORBA, COM 등을 이용해 기업시스템을 개발 해왔다. 이렇게 많은 기업들이 서로 다른 분산 컴퓨팅 기술을 가지고 개발해온 기업 시스템의 통합이 절실히 필요하게 되었다. SOAP은 JAVA, CORBA, COM 등의 분산 객체 기술에 구애받지 않는 프로토콜이며, 심지어 이들 분산 객체 기술을 전혀 사용하지 않는 애플리케이션도 SOAP을 통해 원격 프로시져 호출이나 데이터 전송을 수행할 수 있다. 본 논문에서는 이러한 SOAP의 특징을 이용한 클라이언트/서버간 메시지 전송 시스템을 구현하였다.

• Proceedings of the Korea Society for Simulation Conference
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• 2002.11a
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• pp.91-97
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• 2002

DEVS 형식론을 비롯한 모듈러한 시스템 모델링 방법은 복잡한 시스템을 모델링 할 때 유리하다. 반면에, 모듈러한 구성요소 모델들은 타 구성요소 모델의 상태 정보를 참조, 복사함으로써 빈번한 메시지 전달을 야기 시켜 시뮬레이션 속도가 저하되는 단점이 있다. 모델 합성법(Composition)은 여러 개의 요소모델들을 하나로 통합시키는 연산으로서 시스템 검증 분야에서 많이 사용되어져 왔다. 본 논문은 모델 합성법을 이용하여 구성요소 모델들 간에 주고받는 메시지 수를 줄이고 시뮬레이션 속도를 개선시키는 방법을 제안한다. 간단한 예제를 통하여 제안한 방법을 자세히 보여주고자 한다.

• Journal of KIISE:Computing Practices and Letters
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• v.15 no.1
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• pp.29-37
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• 2009

Recently, message based data transmission plays an important role in modem computing systems. Especially JMS(Java Message Service) is one of the most popular messaging platform. However, because of its characteristics for maintaining reliability, if we want to use it for transmission of large scale messages in a distributed Internet environment by using a WAN connection which may not be robust enough, we need to employ a different method to minimize total transmission time of messages. We found the fact that the total time of message transmission heavily depends on size of a message. In order to achieve the ideal size of a message, we develope a novel mechanism and a system which finds the ideal size of a message and automatical1y control JMS applications for minimizing transmission time. Finally, we test the proposed mechanism and system using real-data in order to prove advantages and compared with the naive mechanism. As a conclusion, we showed that our proposed mechanism and system provide an effective way to reduce transmission time of large scale messages in distributed environment.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.8A
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• pp.937-941
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• 2004

In this paper, we propose a efficient multicast routing algorithm in the wire/wireless integrated environment. Through simulations and comparing to another multicast algorithm, we reach a conclusion is that the routing algorithm can simply and dynamically adjusts the construction of multicast tree with little delay and the most reducible bandwidth resources.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.11a
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• pp.1334-1337
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• 2011

HLA(High Level Architecture)는 분산 환경의 모델링 및 시뮬레이션(Modeling & Simulation)을 위한 공통 아키텍처를 제공하는 기술 표준이며, RTI(Run-Time Infrastructure)를 통해 HLA 서비스를 제공한다. HLA는 연동 객체 모델인 FOM(Federation Object Model)을 기반으로 시뮬레이션 환경을 구성하며, 시뮬레이션에 참여하는 모든 시뮬레이터는 동일한 FOM을 소유해야 한다. 따라서 시뮬레이션 체계 간 연동을 수행하기 위해서는 FOM을 통합하거나 FOM 간 연동을 위한 게이트웨이를 구현해야 한다. 한편, FOM을 통합하는 방법은 각 시뮬레이션의 연동 인터페이스 수정이 필요하기 때문에 게이트웨이를 구현하는 방법이 기존 시스템의 변경을 최소화할 수 있다. 따라서 본 논문은 HLA기반 시뮬레이션의 체계 간 연동을 제공할 수 있는 게이트웨이 구조를 제시한다. 특히, XML 형태의 객체 모델을 기반으로 교환 메시지를 정의하고, 메시지 처리 모듈을 게이트웨이에 플러그인 함으로써 시뮬레이션 체계 간 연동의 용이함을 보여준다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.18 no.11
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• pp.1785-1796
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• 1993

Thanks to the data processing facilities of modern digital computers, the performances of radar has been promoted greatly as one of the main components of command and control systems along with the computer communications. In this study, radar data integrating and processing systems were designed for the data processing of various information from many kinds of radar in a single data processing system. The performance of the data integrating system was analyzed by applying queueing theory. A radar data integrating network was designed for synchronous relational operations among the information processing systems and the transmission characteristics were also analysed by specific models for each system. The designed data integrating systems can be divided into a simplex type and a distributed multiplex type.

• Journal of KIISE:Information Networking
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• v.33 no.5
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• pp.343-354
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• 2006

There has been much research efforts trying to integrate mobile IP that has been proposed to guarantee the mobility of mobile nodes on MANET (Mobile Ad Hoc Networks) and wired integrated networks. To support the mobility service of nodes in MIPMANET, this paper proposes MAAM(Mobility Agent Advertisement Mechanism) and AMAAM protocols. In MAAM, the mobility agent of the mobile IP can maintain the information of ad hoc networks by broadcasting advertisement messages periodically. AMAAM(Aggregation based Mobility Agent Advertisement Mechanism) is an enhancement of MAAM for reducing the number of transmission of advertisement messages by aggregating them. The proposed schemes are applied in MIPMANET for agent advertisement mechanism. For the performance evaluation of both protocols, we simulated them by NS2. We evaluate the protocols by ns2 with such performance metrics as packet delivery ratio, transmission throughput, and energy consumption.

• The Journal of Society for e-Business Studies
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• v.13 no.3
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• pp.1-20
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• 2008

Today's computing environment which is getting distributed to communicate with various systems needs dynamic inter-connectivity of the systems. MOM(Message Oriented Middleware) is popularly used for transmitting XML messages among the distributed systems for the inter-connectivity. But, they do not support event-based message routing functionalities with XML transformation for processing effective message routing, which is essential to inter-connectivity, and there is no integrated platform to cope with these requirements. Although event-based message routing and XML transformation have been studied in a wide range of computer science areas, development of message routing systems is considered as a tough job due to the technological difficulties. In order to address these requirements, we proposed a novel system, named RMRS(Rule-based Message Routing System), which supports event-based message routing as well as XML message transformation. To make the proposed system easy to use, we also redesigned ECA(Event- Condition-Action) rule to fit in our system and developed a tool to map source XML structure into target XML structure.