• The KIPS Transactions:PartC
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• v.13C no.7 s.110
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• pp.889-896
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• 2006

ATM Forum has defined a guaranteed frame rate (GFR) service to serve Internet traffic efficiently. The GFR service provides virtual connections (VCs) for minimum cell rate (MCR) guarantees and allows them to fairly share the residual bandwidth. And ATM Forum has recommended a frame-based generic cell rate algorithm (F-GCRA) as a frame classifier, which determines whether an Am cell is eligible to use the guaranteed bandwidth in a frame level. An ATM switch accommodates cells in its buffer or drops them in a frame level according to current buffer occupancy. A FIFO shared buffer has so simple structure as to be feasibly implemented in switches, but has not been able to provide an MCR guarantee for each VC without buffer management based on per-VC accounting. In this paper, we enhance the F-GCRA frame classifier to guarantee an MCR of each VC without buffer management based on per-VC accounting. The enhanced frame classifier considers burstness of TCP traffic caused by congestion control algorithm so as to enable each VC to use its reserved bandwidth sufficiently. In addition, it is able to alleviate the unfairness problem in usage of the residual bandwidth. Simulation results show that the enhanced frame classifier satisfies quality of services (QoSs) of the GFR service for the TCP traffic.

• Proceedings of the Korean Information Science Society Conference
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• 2006.10d
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• pp.808-811
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• 2006

디지털 액자 또는 디지털 앨범은 여러장의 디지털 이미지를 저장 장치에 저장하여 LCD를 통해 디지털 이미지를 감상할 수 있는 임베디드 장치로 저장 장치에 기록되어 있는 이미지나 네트워크와 통신이 된다면 이미지 서버와 1:1 통신으로 지정된 이미지를 다운받을 수 있다. 이러한 1:1 통신의 이미지 다운로드 방법은 액자에서 액자로 이미지를 전송하거나 다운받을 수 없으므로 원격지의 디지털 액자로 자신이 원하는 이미지를 전송할 수 없는 불편함이 있다. 이에 본 논문에서는 자신의 디지털 액자에서 원격지의 디지털 액자 또는 원격지의 디지털 액자에서 자신의 디지털 액자로 선택한 이미지, 또는 전송받는 이미지를 송수신 할 수 있는 디지털 전자액자의 n:m 연동 방법을 제안한다. 본 논문에서 제안한 방법은 범용 이미지 서버와 디지털 전자액자에 에이젼트를 사용하여 디지털 전자액자와 원격지 디지털 전자액자의 이미지 공유가 가능할 수 있다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.3
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• pp.49-55
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• 2019

An open office or a shared office is emerging as the emphasis on the collaborative and communicative work environments is increasing. In the past, the user maintained the space, but the maintenance of indoor space became difficult because there is no fixed user. Indoor space information can be collected using the ICBM framework system. The facility management can achieve this with data. Therefore, this study proposed a framework based on ICBM (Internet of Things, Cloud, Big Data, and Mobile) for verifying the possibility of a smart facility management system for indoor space. IoT (Internet of Things) technology was used to measure the indoor temperature, humidity, occupancy, and brightness continuously, and provided the data to Web API via WiFi. Data acquired automatically via IoT, existing maintenance data, and spatial information were integrated through the Cloud. Big data collected by sensors were processed as meaningful spatial information for maintenance. Indoor space information and maintenance information can be delivered to the manager through the mobile. Based on the collected data, room occupancy recognition is limited due to a range of ultrasonic wave sensors. On the other hand, brightness represents the space conditions. The difference between lighting on/off, weekday and weekend can be shown. The temperature data and the relative humidity data were collected steadily to evaluate the comfort.

• Journal of Intelligence and Information Systems
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• v.13 no.4
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• pp.1-16
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• 2007

According to the expansion of the Internet use and the utilization of e-business, there are an increasing number of studies of intelligent-based systems for the preparation of ubiquitous environment. In addition, expert systems have been developed from Stand Alone types to web-based Client-Server types, which are now used in various Internet environments. In this paper, we investigated the environment of development for web-based expert systems, we classified and analyzed them according to type, and suggested general typical models of web-based expert systems and their architectures. We classified the web-based expert systems with two perspectives. First, we classified them into the Server Oriented model and Client Oriented model based on the Load Balancing aspect between client and server. Second, based on the degree of knowledge and inference-sharing, we classified them into the No Sharing model, Server Sharing model, Client Sharing model and Client-Server Sharing model. By combining them we derived eight types of web-based expert systems. We also analyzed the location problems of Knowledge Bases, Fact Bases, and Inference Engines on the Internet, and analyzed the pros & cons, the technologies, the considerations, and the service types for each model. With the framework proposed from this study, we can develop more efficient expert systems in future environments.

• Journal of Internet Computing and Services
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• v.6 no.4
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• pp.75-84
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• 2005

Grid computing enables a shift from a localized resource computing model to a fully-distributed virtual organization with shared resources, Accounting is one of the main obstacles to widespread adoption of the Grid. Accounting has until recently, been a sparsely-addressed problem, particularly in practice. In this paper, we design and implement the accounting information gathering system. Accounting information gathered at each local system does not include grid-aware information. To be useful in grid environment, grid user information must be included in accounting information. To make it useful in grid environment, we add grid user information with PGAM. Implemented system is based on OGSA, following GSAX framework of RUS-WG in GGF. And the schema of accounting information is following usage Record Fields of UR-WG in GGF. Also, the accounting information integrating and monitoring tool for system management in the Grid environment are implemented.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2000.05a
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• pp.93-97
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• 2000

In an era of very rapid technological change, standardization organizations have been confronted with the problem that they should develop more new and more complex standards as strategic tools for enforcement of competitive power in shorter time according to the reduction of Life Cycle of products and the increase in the number of standards and their complexity. To cope with this challenge, we introduce the functionalities and development directions for implementing standardization information system. Also this paper describes the architecture of the next generation system for standard information that enabling information sharing and exchanging using XML. Finally, we suggest implementation framework of Standardization Vortal Site for the One-stop service of integrated standards information which provide users with standards development roadmap and give brief introduction to SOL(Standards On-Line) site which is operated by ETRI/PEC.

• Convergence Security Journal
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• v.13 no.6
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• pp.35-41
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• 2013

What is an alternative to medical information security of medical information more secure preservation and safety of various types of security threats should be taken, starting from the software design. Interspersed with medical information systems medical information to be able to integrate the real-time exchange of medical information must be reliable data communication. The software architecture design of medical information systems and sharing of medical information security issues and communication phase allows the user to identify the requirements reflected in the software design. Software framework design, message standard design, design a web-based inter-process communication procedures, access control algorithm design, architecture, writing descriptions, evaluation of various will procedure the establishing architecture. The initial decision is a software architecture design, development, testing, maintenance, ongoing impact. In addition, the project will be based on the decision in detail. Medical information security method based on the design software architecture of today's medical information security has become an important task of the framework will be able to provide.

• 한국IT서비스학회:학술대회논문집
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• 2009.11a
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• pp.188-197
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• 2009

최근 비즈니스 환경이 빠르게 변화함에 따라 기업의 민첩한 대응이 요구되고 있으며, 서비스지향 아키텍쳐(Service-Oriented Architecture(SOA))가 유력한 대안으로 제시되고 있다. SOA는 서비스를 공유하고 재사용 할 수 있도록 정보시스템을 구축하는 소프트웨어 설계 방법론으로써, 급변하는 비즈니스 환경에 맞도록 민첩한 대응이 가능하도록 한다. 이러한 SOA의 장점으로 인해 현재 많은 기업에서 SOA를 이용한 시스템 개발을 진행하고 있다. 그러나, 이러한 SOA를 적용한 시스템 개발 노력이 계속 시도되고는 있지만 SOA기반의 표준화된 방법론은 아직 정립되지 않은 실정이다. 따라서, SOA를 이용한 시스템 개발은 현재 많은 어려움에 직면하고 있다. 본 논문에서는 표준화된 방법론으로써 온톨로지 기반의 SOA 개발방법론을 제시한다. 제안하는 방법은 온톨로지를 이용하여 서비스를 서비스 프로파일과 서비스 모델로 구분하여 정의하여 서비스 식별을 위한 기본 프레임워크를 제시한다. 또한 식별된 서비스들을 온톨로지 개념을 이용하여 검색, 재사용 할 수 있는 방법론을 제시하여 서비스 재활용도를 높일 수 있도록 한다. 본 논문에서 제안하는 온톨로지 기반의 SOA 개발 방법론은 현재 사용중인 다른 개발방법론과 비교 분석하였다. 비교 결과 본 논문에서 제안하는 온톨로지 기반 SOA 개발방법론은 현재까지 제안된 다른 방법보다 효율적이고 체계적인 개발 결과를 제공하는 것으로 나타났다. 본 논문에서 제안하는 연구 결과는 SOA에 표준방법론의 개발의 기반을 제공하여, 서비스의 의미론적 접근에 대한 시도 등 향후 연구에 중요한 방향성을 제공할 수 있을 것으로 기대 된다.

• Journal of KIISE:Computing Practices and Letters
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• v.6 no.5
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• pp.513-527
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• 2000

This paper describes our experience to design and implementation of a collaborative system framework that allows to develop certain collaborative applications such as 3D animation, computer game, and industrial design. The collaborative system enables users, who located in geographically long distance, to do collaborative work in a single virtual space. The proposed system basically consists of client and server system. The goal of proposed system is to support scalability, portability, and platform independent. In order to achieve these, the server is implemented in Java platform and is adopted to the hybrid architecture which takes the advantages both in centralized and decentralized collaborative system. We construct the server base on its functional characteristics so called User Manager Server (UMS), Session Manager Server (SMS), and Information Server (IS), The UMS manages the users who are taking part in the collaborative operations. The SMS supports the conferencing in the proposed system. The IS provides the connection methods among the UMSs. For user's convenience, we implement the client using Visual C++ in Windows. We also expend the functions of 3D Studio Max to distributed environment by means of the plug-in module, and facilitate the chatting and white board functions as well.

• Proceedings of the KAIS Fall Conference
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• 2001.05a
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• pp.362-365
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• 2001

앞으로의 컴퓨터 시스템은 호스트 집중형 매인프레임 컴퓨팅, 클라이언트/서버, 분산객체, ERP시스템 등으로 발전하는 것으로 전망된다. 메인프레임을 통한 호스트 중심의 중앙집중형 시스템이 네트워크와 PC의 발전으로 클라이언트/서버 시스템의 시대를 열었다. 분산 환경에서 사용자들은 여러 저장 장치로부터 정보를 얻을 수 있고 서로 다른 이질적인 시스템에 있는 사용자들과 함께 자료를 공유, 통신할 수 있어야 한다. 때문에 분산 애플리케이션을 작성하기 위해서는 일단 서로 다른 운영체계와 네트워크 환경 등으로 구성된 이질적이고 복잡한 환경을 전제로 삼아야 한다. 이러한 환경에서 클라이언트/서버 소프트웨어를 개발하고 이를 서로 다른 시스템과 쉽게 통합할 수 있기 위해서는 이종의 분산 환경에서 여러 종류의 옹용 프로그램을 통합할 수 있는 표준의 결합 방식이 필요하다. 분산 객체 시스템과 ERP시스템이 도입ㆍ구축되었다고 해서 기업의 경쟁력이 강화되고 이윤 극대화가 달성되고 고객만족이 이루어지는 것은 아니다. 최적의 ERP시스템을 구축하기 위해서 도입단계에서부터 체계적인 접근이 필요하다. 본 연구에서는 ERP서버의 현황과 분산객체 미들웨어를 활용한 ERP서버에 대해 기술하고 ERP시스템 도입에 대한 분석을 시도함으로써 ERP 시스템의 성공적인 도입전략에 대해 연구하였다.