• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 하계종합학술대회 논문집(3)
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• pp.105-108
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• 2001

In this paper, "The PLC Controlling on Web Browser" is designed and implemented to remote control and to monitor FA system. Protocol bidirectional communication with PLC is written and sotted. Then Administration system sets Web server and JAVA Sevelet Program. The client system located at the monitoring Web browser are a JAVA Sevelet base system, and sends some commands to the server system which guards and controls the PLC system. The commands are delivered to the server system and the driver software exists in the server controls the PLC system directly.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.2131-2136
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• 2003

Since the number of user-requests increases dramatically on the Internet, the servers and networks can be swamped unexpectedly without any prior notice. Therefore, the end-users are waiting or refused for the responses of the contents from the originating servers. To solve this problem, it has been considered that a distributed web caching system efficiently utilizes structural elements of the network. Because a distributed web caching system uses the caches that are close to end-users on the network, it transmits the contents to users faster than the original network system. This paper proposes a simple client-based distributed web caching system(2HRCS) that client can directly perform object allocation and load balancing without an additional DNS for load balancing in CARP (Cache Array Routing Protocol) and GHS (Global Hosting System) that are the recent distributed web caching system protocol. The proposed system reduces the cost of setup and operation by removing DNS that needs to balance the load in the existing system. The system has clients with consistent hashing method, so it extends its environment to other distributed web caching system that has caches of different capacity. A distributed web caching system is composed and tested to evaluate the performance. As a result, it shows superior performance to consistent hashing system. Because this system can keep performance of the existing system and reduce costs, it has the advantage of constructing medium or small scale CDN (Contents Delivery Network).

• 대한전자공학회논문지TE
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• 제39권3호
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• pp.42-50
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• 2002

본 논문에서는 웹을 이용하여 지하주차장의 조명등을 제어하는 시스템을 설계 및 구현하였다. 본 시스템은 RS-485로 연결된 조명제어시스템과 웹 인터페이스를 제공하는 모니터링 시스템(WebPL)으로 구성된다. 조명제어시스템은 모니터링시스템의 사용자 명령에 의해 제어되며, 움직이는 물체를 센싱하고 지하주차장의 조명등을 점등 또는 소등한다. 모니터링시스템은 조명제어시스템으로부터 받은 조명등의 상태를 웹브라우저로 보여주며, 또한 실시간으로 지하주차장의 조명등을 웹브라우저상에서 직접 제어할 수 있다.

• 한국지능정보시스템학회:학술대회논문집
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• 한국지능정보시스템학회 1999년도 춘계공동학술대회-지식경영과 지식공학
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• pp.95-102
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• 1999

The web-based group collaborative systems are emerging as enterprise-wide information systems. Since data in group collaborative systems are apt to be shared among multiple concurrent users and modified simutaneously by them, the web-based group collaborative systems must support synchronous collaboration in order to provide users with synchronized and consistent views of shared data. This paper proposes an active web server which can facilitate synchronous collaboration in web-based group collaborative systems. To accomplish such a goal, the active web server manages dependency relationships between shared data and web browsers referencing them and actively propagates changing details of the shared data to all web browsers referencing them. And, this paper examines usefullness and effectiveness of the active web server to apply it to the ball-bearing design example of concurrent engineering design systems. The prototype system of the active web server is developed on a commercial Object-oriented Database Management System (ODBMS) called OBJECTSTORE using the C++ programming language.

• 한국IT서비스학회지
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• 제13권1호
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• pp.147-159
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• 2014

Recently, the quantity of information that is accessible from the Internet is being dramatically increased. Searching the Web for useful information has therefore become increasingly difficult. Thus, much research has been done on web robots which perform internet information filtering based on user interest. If a web site which users want to visit is found, its content is searched by following the searching list or Web sites links in order. This search process takes a long time according as the number of page or site increases so that its performance need to be improved. In order to minimize unnecessary search with web robots, this paper proposes an efficient information collection system based on compare and merge method. In the proposed system, a web robot initially collects information from web sites which users register. From the next visit to the web sites, the web robot compares what it collected with what the web sites have currently. If they are different, the web robot updates what it collected. Only updated web page information is classified according to subject and provided to users so that users can access the updated information quickly.

• 한국컴퓨터정보학회논문지
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• 제21권12호
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• pp.107-114
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• 2016

Web system helps high-performance processing for big-data analysis and practical use to make various information using IT resources. The government have started the RPS system in 2012. The system invigorates the electricity production as using renewable energy equipment. The government operates system gathered big-data with various related information system data and the system users are distributed geographically. The companies have to fulfill the system, are available to purchase the REC to other electricity generation company sellers to procure REC for their duty volumes. The REC market operates single auction methods with users a competitive price. But the price have the large variation with various user trading strategy and sellers situations. This papler proposed RPS system modeling and simulation in web environment that is modeled in geographically distributed computing environment for web user with DEVS W/S. Web simulation system base on web service helps to analysis correlation and variables that act on trading price and volume within RPS big-data and the analysis can be forecast REC price.

• Asia pacific journal of information systems
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• 제13권2호
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• pp.145-170
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• 2003

Open Decision Support System(DSS) is an automated and transparent system that is built to be shared both within and across organizations. The open DSS has been thought to be a set of decision components that are communicating through Web protocols. These characteristics intuitively invite the Web services concepts, which are currently one of the new trends in network-based business services. However, web services still are not active enough to be autonomous, and to provide for composing functionalities. These lead to the motivation on building a sophisticated web service to contain these features and to utilize web services on behalf of the user. This paper aims to propose a new concept of Meta Web Service, a web service-based open DSS. Decision modules in a dynamic and open DSS can be viewed as a web service. The Meta Web Service understands the users problem statement with ontology, performs web service discovery, web service composition, and automatically generates codes for composite web service execution. A prototype of example web service has been developed to show the feasibility of the proposed idea.

• 정보처리학회논문지A
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• 제11A권1호
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• pp.29-36
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• 2004

인터넷 사용자의 수가 폭발적으로 늘어나고 엘 컨텐츠의 양이 많아지면서 웹서버의 부하를 줄이면서 사용자에게 보다 빠르게 웹서비스를 제공하는 것이 중요한 문제가 되었다. 웹캐시 시스템은 사용자와 웹서버 사이에 위치하여 웹서버의 부하를 줄여주고 사용자의 서비스 응답시간을 줄여주기 위한 효과적인 방법으로 많이 사용되고 있다. 본 논문에서는 소스가 공개되어 있는 스퀴드 웹캐시 시스템을 이용하여 데이터 압축기능을 가진 웹캐시 시스템을 개발하였다. 압축기능을 가진 웹캐시 시스템은 웹캐시 시스템과 사용자 사이의 데이터론 압축하여 전송함으로써 네트워크의 트래픽을 줄여주고 사용자의 웹서비스 응답시간을 줄여주는 효과가 있다. 특히 리버스 캐시 시스템의 경우에는 종단간 병목구간인 인터넷 추간의 트래픽 양을 줄여주므로 그 효과는 더욱 크게 나타난다. 성능측정 결과 원래 웹 객체의 크기에 따라 압축율은 달라지지만 2배에서 크게는 8배 정도까지의 데이터 전송량이 줄었으며 사용자의 응답시간은 평균 37% 정도의 속도 향상이 있었으며 원래 데이터의 크기가 10Kbyte 이상인 경우에서는 평균 속도 향상율이 87% 정도로 향상 정도가 더욱 크다는 것을 알 수 있었다.

• 산업기술연구
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• 제19권
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• pp.293-300
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• 1999

This paper is aimed at the development of comprehensive environmental management system, which can be operated on the basis of world wide web. This study has been initiated as a topic of G7 project in 1988, and will be accomplished in 2001. Even thought there should be lots of works remaining to achieve this goal, preliminary products can be summarized as follows : 1) integrated environments information management system, 2) web based control engine, 3) surface water environment management system, 4) subsurface water environment management system, 5) sewer and waterworks management system. The core methodology of the engine is the generalized multidimensional finite element matrices to depict the terms in the analysis of various partial differential equations. Spatial information management system (ArcView) and Visual Basic were extensively employed to construct GUI oriented web based engine. Developed systems were consist with very intense computer codes due to the necessity of combinatory management of environmental problems. The web based engine could be served as a decision tool for the integrated management of environmental projects in Korea.

• 융합보안논문지
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• 제12권3호
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• pp.85-92
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• 2012

기존의 보안 관리 수준을 측정하기 위한 방법들이 다양하지만 IT 자산을 중심으로 한 평가만이 이루어지고 있는 관계로 조직 전반에 걸친 분석이 이루어지지 못했다. 따라서 본 논문에서는 보안 관리 수준 점검을 손쉽게 할 수 있도록 웹 기반 보안 관리 수준 분석 도구에 대해 제시한다. 본 도구의 경우는 전사적 정보 보호 관리 방법론인 ISO 27001의 보안통제 항목들을 기반으로 설문 내용을 구성하였다.