• 제어로봇시스템학회논문지
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• 제10권4호
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• pp.371-376
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• 2004

Distributed Network Protocol Version 3.0 (DNP3.0) is the communication protocol developed for the interoperability between a RTU and a central control station of SCADA in the power utility industry. In this paper DNP3.0 is implemented by using HDL with FPGA and C program on Hitachi H8/532 processor. DNP3.0 is implemented from physical layer to network layer in hardware level to reduce the computing load on a CPU. Finally, the ASIC for DNP3.0 has been manufactured from Hynix Semiconductor. The commercial feasibility of the hardware through the communication test with ASE2000 and DNP Master Simulator is performed. The developed protocol becomes one of IP, and can be used to implement SoC for the terminal device in SCADA systems. Also, the result can be applicable to various industrial controllers because it is implemented in HDL.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2006년도 한국컴퓨터종합학술대회 논문집 Vol.33 No.1 (D)
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• pp.124-126
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• 2006

Mobile Ad hoc networking is an emerging technology and in these days many applications are being developed to run on these networks. In these networks lookup services are very important because all nodes do not have same resources in term of memory and computing power. Nodes need to use different services offered by different servers. Reliable and efficient scheme should be available for lookup services due to limited bandwidth and low computing power of devices in mobile ad hoc networks. Due to mobility and rapid change in network topology, lookup mechanism used in wired network is not appropriate. Service discovery mechanism can be divided into two main categories Centralized and Distributed. Centralized mechanism is not reliable as there is no central node in these networks. Secondly centralized mechanism leads toward single point failure. We can handle the service discovery mechanism by distributing server's information to each node. But this approach is also not appropriate due to limited bandwidth and rapid change in network. In this paper, we present reliable lookup service scheme which is based on distributed mechanism. We are not using replication approach as well due to low bandwidth of wireless networks. In this scheme service discovery mechanism will be handled through different lookup servers. Reliability is the key feature of our proposed scheme.

• 정보관리연구
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• 제31권4호
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• pp.71-87
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• 2000

최근 네트워크로 연결된 이기종의 유용성을 높이고 기존의 분산객체 컴퓨팅의 문제해결을 위해 이동 에이전트(Mobile agent)의 연구가 활발히 이루어지고 있다. 이런 연구를 통해 기존의 분산시스템뿐만 아니라 전자상거래, 네트워크관리, 정보검색 등 많은 분야에 이동 에이전트를 적용시키는 연구가 진행되고 있으며, 많은 시스템이 개발되고 있다. 본고에서는 에이전트의 연구에 있어 관련된 사항을 알아보고 에이전트간 통신기능향상을 위해 연구한 내용을 바탕으로 전반적인 내용을 다루고자 하며, 마지막으로 에이전트의 미래와 적용분야에 대해 다루고자 한다.

• International Journal of Computer Science & Network Security
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• 제24권7호
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• pp.177-185
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• 2024

Web science, a general discipline of learning is presently at high demand of expertise with ideas to develop software-based WebApps and MobileApps to facilitate user or customer demand e.g. shopping etc. electronically with the access at their smartphones benefitting the business enterprise as well. A worldwide-computerized reservation network is used as a single point of access for reserving airline seats, hotel rooms, rental cars, and other travel related items directly or via web-based travel agents or via online reservation sites with the advent of social-web, e-commerce, e-business, from anywhere-on-earth (AoE). This results in the accumulation of large and diverse distributed databases known as big data. This paper describes a novel intelligent web-based electronic booking framework for e-business with distributed computing and data mining support with the detail of e-business system flow for e-Booking application architecture design using the approaches for distributed computing and data mining tools support. Further, the importance of business intelligence and data analytics with issues and challenges are also discussed.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2008년도 추계종합학술대회 B
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• pp.836-841
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• 2008

21세기를 들어서면서 본격적으로 차세대 IT패러다임으로 등장한 유비쿼터스(Ubiquitous) 분야는 정보기술의 패러다임이 PC와 인터넷 중심에서 유비쿼터스로 이동하면서 미래 유비쿼터스 시장을 선점하기 위한 세계 주요국가와 IT기업들이 치열한 전쟁터로 인식되고 있다. 본 연구에서는 유비쿼터스 디바이스에 관련된 국내외 기술 및 연구동향을 알아보고, 유비 쿼터스 사회의 진화에 따른 미래효과와 그에 따른 연구방향 등을 살펴보도록 한다.

• 품질경영학회지
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• 제48권4호
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• pp.553-566
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• 2020

Purpose: The purpose of this study was to design a framework for generating one-class classification algorithm based on Hyper-Rectangle(H-RTGL) in a distributed environment connected by network. Methods: At first, we devised one-class classifier based on H-RTGL which can be performed by distributed computing nodes considering model and data parallelism. Then, we also designed facilitating components for execution of distributed processing. In the end, we validate both effectiveness and efficiency of the classifier obtained from the proposed framework by a numerical experiment using data set obtained from UCI machine learning repository. Results: We designed distributed processing framework capable of one-class classification based on H-RTGL in distributed environment consisting of physically separated computing nodes. It includes components for implementation of model and data parallelism, which enables distributed generation of classifier. From a numerical experiment, we could observe that there was no significant change of classification performance assessed by statistical test and elapsed time was reduced due to application of distributed processing in dataset with considerable size. Conclusion: Based on such result, we can conclude that application of distributed processing for generating classifier can preserve classification performance and it can improve the efficiency of classification algorithms. In addition, we suggested an idea for future research directions of this paper as well as limitation of our work.

• 한국전자거래학회:학술대회논문집
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• 한국전자거래학회 2003년도 종합학술대회 논문집
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• pp.249-254
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• 2003

Object caching is a desirable feature to improve the both scalability and performance of distributed application systems for information infrastructure, the information management system leveraging the power of network computing. However, in order to exploit such benefits, we claim that the following problems: cache server placement, cache replacement, and cache synchronization, should be considered when designing any object cache system. We are under developing DOC: a Distributed Object Caching, as a part of building our information infrastructures. In this paper, we show how each problem is inter-related, and focus to highlight how we handle cache server deployment problem

• 인터넷정보학회논문지
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• 제5권3호
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• pp.87-98
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• 2004

일반 가입자들에게 초고속 인터넷 서비스를 제공하기 위해서 구성되는 가입자 망은ADSL, VDSL, DOCSIS 등 다양한 종류의 접속방식과 그에 따른 이기종(이기종)의 장비들로 이루어져 있다. 이러한 가입자 망은 전국적으로 분산되어 있으며, 분산된 가입자 망은 효과적이며 집중화된 형태로 관리하기 위해서는 다양한 형태의 접속방식을 지원하는 이기종 장비 및 단말들의 상위 개념으로서 추상적이며 논리적인 객체 관리모델이 필요하다. 본 논문은 통합된 계층적 망관리를 가능하게 하는 인터넷 가입자 망에 대한 모델링 구조론 RM-ODP흘 이용하여 제시하였다. 그리고 가입자 망의 예로서 UML을 이용한 객체지향 방법론을 채택하여 DOCSIS의 HFC 가입자망에 대한 관리 시스템을 설계하고 구현하였다.

• Journal of Information Processing Systems
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• 제18권1호
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• pp.159-172
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• 2022

The role of the interconnect network, which connects computing nodes to each other, is important in high-performance computing (HPC) systems. In recent years, the peripheral component interconnect express (PCIe) has become a promising interface as an interconnection network for high-performance and cost-effective HPC systems having the features of non-transparent bridge (NTB) technologies. OpenSHMEM is a programming model for distributed shared memory that supports a partitioned global address space (PGAS). Currently, little work has been done to develop the OpenSHMEM library for PCIe-interconnected HPC systems. This paper introduces a prototype implementation of the OpenSHMEM library through a switchless interconnect network using PCIe NTB to provide a PGAS programming model. In particular, multi-interrupt, multi-thread-based data transfer over the OpenSHMEM shared memory model is applied at the implementation level to reduce the latency and increase the throughput of the switchless ring network system. The implemented OpenSHMEM programming model over the PCIe NTB switchless interconnection network provides a feasible, cost-effective HPC system with a PGAS programming model.

• 한국전자통신학회논문지
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• 제1권1호
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• pp.20-26
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• 2006

최근에 급성장하고 있는 실시간 통신 분산 컴퓨팅은 최근에 컴퓨터 응용분야의 하나로서 컴퓨터 과학과 공학 분야에서 급성장하고 있는 한 분야이다. 실시간 객체 지향 분산 컴퓨팅은 분산된 컴퓨터 시스템에서 객체 네트워크의 형태로 구성된 실시간 분산 컴퓨팅이다. 본 논문에서는 TMO 구조를 이용하여 실시간 통신 시뮬레이션 프로그래밍을 하기 위해 DHS(Distributed High-Precision Simulation)라는 응용 환경에 적용하였다. TMO 구조에서 사용되는 시간 구동 및 메시지 구동 구조는 충분한 서비스를 제공하기 위해 데드라인 시간을 보장함으로서 실시간 시뮬레이션 프로그래머의 노력을 줄일 수 있는 이점을 가지고 있다. 데드라인 시간 보장은 프로그래머의 설계 시간을 처음 객체부터 적용하여 보장함으로서 형성될 수 있다. 분산된 객체지향 실시간 통신 시스템에서 TMO 구조를 이용한 다단계 프로그래밍 설계를 함으로서 실시간 통신 프로그래밍을 유연하게 작성할 수 있다.