• 대한조선학회논문집
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• 제56권2호
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• pp.152-160
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• 2019

In this study, we propose a piping material supply management method using CAD system. The piping materials installed in super large offshore plants have very complicated connection conditions. Therefore, it is very difficult to determine the order of receipt of a large number of installation materials. Therefore, we have developed a system that can automatically check the preparation rate of installation materials prior to the installation process. We have developed an algorithm to obtain connection information among installation items from PDMS system. We have developed an algorithm that can determine the order of installation materials to be installed using the connection information. The order of the installation material is determined by taking into account the constraint conditions for the complete installation of the piping material. We confirm the effectiveness of the developed algorithms in the operating system. This system is also used to manage installation schedules and plan the installation manpower.

• 한국컴퓨터정보학회논문지
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• 제11권3호
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• pp.97-105
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• 2006

변화하는 기업 환경에 효과적으로 대응하기 위해서는 우리나라 중견 제조업 환경에 적합한 생산 마스터 정보관리 솔루션 도입이 시급하다 따라서 본 논문에서는 사용하기 편리한 사용자 인터페이스를 가지며, 다양한 시스템들과도 쉽게 연동할 수 있도록 표준 데이터 구조를 설계하였다. 또한 표준 데이터 구조를 중간언어 형태로 생성해 주는 자동화 연동 모듈을 탑재하고, 생산 관리 데이터의 확장이 가능한 생산 마스터 정보관리 솔루션을 개발하였다. 본 개발을 통하여 업무적으로는 관리하지 않았던 데이터를 관리함으로써 보다 효율적인 업무 프로세스 구성을 이룰 수 있을 뿐만 아니라 시스템 확장 시 보다 안정적인 시스템 구축을 위한 근간을 제공할 수 있다.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2003년도 춘계학술발표논문집 (하)
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• pp.1507-1510
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• 2003

웹 어플리케이션 개발 시 데이터베이스 시스템의 사용이 증가함에 따라 데이터베이스 시스템에 접속하는 커넥션 리소스 관리에 대한 중요성이 부각되고 있다. 본 논문은 웹 어플리케이션 구축 시 사용하는 데이터베이스 접속 풀(Database connection Pool)의 성능을 평가하고 진단하는 도구를 제안한다. 본 도구는 성능 및 진단을 통하여 웹 어플리케이션에 가장 적합한 최적화된 DB 커넥션 풀을 최적화하는 방법을 제시한다. 아울러 제안된 도구를 사용한 효과적인 데이터베이스 접속 풀(Database Connection Pool)의 관리 결과에 대하여 기술한다.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2001년도 춘계학술발표논문집 (상)
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• pp.507-510
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• 2001

HTTP/1.1 standard reduces latencies and overhead from closing and re-establishing connections by supporting persistent connections as a default, which encourage multiple transfers of objects over one connection. HTTP/1.1, however, does not define explicitly connection-closing time but specifies a certain fixed holding time model. This model may induce wasting server's resource when server maintains conn ection with the idle-state client that requests no data for a certain time. This paper proposes the mechanism of a heuristic connection management supported by the client-side under persistent HTTP, in addition to HTTP/1.1's fixed holding time model on server-side. The client exploits the tag information within transferred HTML page so that decides connection-closing time. As a result, the mechanism allows server to use server's resource more efficiently without server's efforts.

• Steel and Composite Structures
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• 제34권5호
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• pp.625-641
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• 2020

The realistic modeling of the beam-column semi-rigid connection in steel frames attracted the attention of many researchers in the past for the seismic analysis of semi-rigid frames. Comparatively less studies have been made to investigate the behavior of steel frames with semi-rigid connections under different types of earthquake. Herein, the seismic behavior of semi-rigid steel frames is investigated under both far and near-field earthquakes. The semi-rigid connection is modeled by the multilinear plastic link element consisting of rotational springs. The kinematic hysteresis model is used to define the dynamic behavior of the rotational spring, describing the nonlinearity of the semi-rigid connection as defined in SAP2000. The nonlinear time history analysis (NTHA) is performed to obtain response time histories of the frame under scaled earthquakes at three PGA levels denoting the low, medium and high-level earthquakes. The other important parameters varied are the stiffness and strength parameters of the connections, defining the degree of semi-rigidity. For studying the behavior of the semi-rigid frame, a large number of seismic demand parameters are considered. The benchmark for comparison is taken as those of the corresponding rigid frame. Two different frames, namely, a five-story frame and a ten-story frame are considered as the numerical examples. It is shown that semi-rigid frames prove to be effective and beneficial in resisting the seismic forces for near-field earthquakes (PGA ≈ 0.2g), especially in reducing the base shear to a considerable extent for the moderate level of earthquake. Further, the semi-rigid frame with a relatively weaker beam and less connection stiffness may withstand a moderately strong earthquake without having much damage in the beams.

• 한국IT서비스학회지
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• 제19권5호
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• pp.33-47
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• 2020

In recent years, due to the demand for operating efficiency and cost reduction of industrial facilities, remote access via the Internet is expanding. the control network accelerates from network separation to network connection due to the development of IIoT (Industrial Internet of Things) technology. Transition of control network is a new opportunity, but concerns about cybersecurity are also growing. Therefore, manufacturers must reflect security compliance and standards in consideration of the Internet connection environment, and enterprises must newly recognize the connection area of the control network as a security management target. In this study, the core target of the control system security threat is defined as the network boundary, and issues regarding the security architecture configuration for the boundary and the role & responsibility of the working organization are covered. Enterprises do not integrate the design organization with the operation organization after go-live, and are not consistently reflecting security considerations from design to operation. At this point, the expansion of the control network is a big transition that calls for the establishment of a responsible organization and reinforcement of the role of the network boundary area where there is a concern about lack of management. Thus, through the organization of the facility network and the analysis of the roles between each organization, an static perspective and difference in perception were derived. In addition, standards and guidelines required for reinforcing network boundary security were studied to address essential operational standards that required the Internet connection of the control network. This study will help establish a network boundary management system that should be considered at the enterprise level in the future.

• 한국전자거래학회지
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• 제8권1호
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• pp.121-139
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• 2003

Currently, it is not popular to use the STEP based product information in the construction drawing files, in spite of the importance and possibility of using various product data in drawing files on the CALS/EC environment. This paper aims to demonstrate a construction drawing information management system based on ISO 10303/STEP. To achieve this aim, the authors have analyzed the current construction drawing information classification hierarchy widely used for domestic and international, and examined the material data connection mechanism within CAD drawing data, and finally investigated the management systems for construction documentations and drawings in a public companies. Therefore, the expected benefit of the proposed system is that STEP drawing information management will be done standardization and the information of STEP construction drawing can be managed, shared and supported design business through materials data connection.

• 한국산학기술학회논문지
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• 제16권10호
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• pp.6458-6465
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• 2015

모바일 어플리케이션의 잦은 변경으로 인해 모바일 서비스의 관리가 부담이 되고 있으며, 이에 중앙관리가 용이한 모바일 웹 서비스 개발이 증가하고 있다. 모바일 웹 서비스 개발에 대해 개발자뿐 만 아니라 일반 사용자도 쉽게 개발할 수 있는 도구들이 개발되고 있다. 그러나 모바일 웹 서비스를 일반 사용자가 동적으로 구현하기 위한 표준화된 메타모델의 연구가 미흡한 상황이다. 이에 본 논문에서는 동적으로 모바일 웹 서비스를 개발할 수 있는 메타모델을 제안한다. 동적 메타모델은 XPDL 구조를 이용하여 모바일 웹 페이지와 모바일 웹 페이지 인스턴스, 그리고 동적 연결로 구성된다. 연결 메타모델에 대해 조건연결, 분기연결, 결합연결에 대해 연구하며, 최종적으로 전체 모델들을 통합하여 통합메타모델을 제안한다. 또한, 동적 메타모델의 적합성을 검증하기 위해 각 메타모델에 대해 XPDL 기반으로 사례 연구를 수행한다.

• 대한안전경영과학회지
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• 제17권4호
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• pp.161-169
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• 2015

A fire sprinkler system is very important to extinguish fire in the building. The sprinkler system initiates sprinkler discharge if the detection system identifies a developing fire and opens the pre-action valve. However, pre-action fire sprinkler systems mainly installed in the underground parking lot at the apartment complex do not properly operate at fire if the connection type of fire sprinkler systems does not properly installed and operated. This study identified the relationship between fire dispersion & damage and the connection type of water supply in the sprinkler system from many fire cases at the apartment complex in South Korea. In addition, this study also identified the water supply differences and characteristics between South Korea and foreign countries. The main purpose of this study is also to improve the water connection types in the sprinkler system that can reduce the potential failures of pre-action valve operation through electrical signal system. The study also suggests the improvement plan for water connection types in pre-action fire sprinkler system that can minimize potential failure of pre-action fire sprinkler system. The suggestions for revising the fire safe standard in South Korea includes letting the water supply pipe of sprinkler system water inlet connect to the second side of pre-action valve and the water flow device that can minimize potential failure of sprinkler system.

• 한국통신학회논문지
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• 제29권12B호
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• pp.1042-1051
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• 2004

IEEE1394는 멀티미디어 흠 네트워크 환경에서 사용되는 대표적인 네트워크 프로토콜로서 비동기 전송과 등시성 전송을 통한 멀티미디어 서비스를 제공한다. 하지만 다수의 A/V 디바이스가 IEEE1394 네트워크에 참여하여 멀티미디어 데이터 전송을 하게 되면 등시성 자원의 독점과 등시성 연결의 중복이 발생할 수 있다. 본 논문에서는 IEEE1394-IEC61883 기반의 멀티미디어 홈 네트워크 환경에서 등시성 자원과 등시성 연결의 효율적인 관리를 위한 미들웨어를 제안한다. 본 논문에서 제안된 등시성 연결 관리 미들웨어는 다양한 종류의 등시성 연결을 지원하며 등시성 연결의 안정적인 복원을 보장하며 멀티미디어 데이터의 실시간 송수신을 보장하도록 설계 구현되었다. 제안된 미들웨어에서 등시성 연결 관리를 위한 코바 APl를 제공하였으며 성능 평가 및 검증을 하였다.