• Journal of the Korean Vacuum Society
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• v.17 no.5
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• pp.408-418
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• 2008

The rectangular resonant cavity was designed and characterized as a microwave plasma source for focused ion beam. The optimum cavity was calculated analytically and analyzed in detail by using HFSS(High Frequency Structure Simulator). Since the resonant cavity can be affected by the permittivity of quartz chamber and plasma, the cavity is designed to be changeable in one direction. By observing the microwave input power at which the breakdown begins, the optimum cavity length for breakdown is measured and compared with the calculated one, showing in good agreement with the optimum length reduced by 10cm according to the permittivity change in the presence of quartz chamber. The shape of breakdown power curve as a function of pressure appears to be similar to Paschen-curve. After breakdown, plasma densities increase with microwave power and the reduced effective permittivity in the cavity with plasma results in larger optimum length. However, it is not possible to optimize the cavity condition for high density plasmas with increased input power, because too high input power causes expansion of density cutoff region where microwave cannot penetrate. For more accurate microwave cavity design to generate high density plasma, plasma column inside and outside the density cutoff region needs to be treated as a conductor or dielectric.

• Journal of Korean Tunnelling and Underground Space Association
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• v.19 no.3
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• pp.437-447
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• 2017

In current, there has not been the evaluation model for the optimum design of the multi-utility tunnel by considering urban type and size, the function of surrounding road and feasibility analyses with respect to construction method, and arrangement of accommodation facilities inside multi-utility tunnel. Thus, in this study, we developed the evaluation model for the optimum design of the multi-utility tunnel before and after the decision of the multi-utility tunnel installation. In this paper, we have selected the Deming cycle which is used in various fields among several decision methods for optimizing the design. For the purpose of reflecting the various factors in the design of the multi-utility tunnel, 11 higher indicators were set up to lead to more detailed approaches. In addition, based on the "Plan-Do-Check-Action (PDCA)" circulation method, we can realize the installation of the multi-utility tunnel and design more efficiently through the first phase for conception and the second phase for optimization, and develop the program for the evaluation model accordingly.

• Fire Science and Engineering
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• v.15 no.3
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• pp.63-69
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• 2001

Applying a life safety concept to apartment design procedure is essential to protect people from unwanted fire. A Balcony design in apartment is a important egress safety factor because it provide means of safe egress and can limit a flame spread to adjacent space from fire source. Some design principles and details of balcony plan are suggested to improve egress safety level with analyzing broad case study.

• Korean Institute of Interior Design Journal
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• no.22
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• pp.132-138
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• 2000

Internet services are utilizing a variety of server/client technologies. In particular internet technologies provide improved accessibility to information for facility management customers and users for the systems. This study is the architectural data exchange system development more effective management and accept using on Internet web environment. This paper is the explore the use of computers in architectural planning that how the information may be extracted drawing entered into database and exchanged architectural detail data interfaces. System support communication and interactive collaboration among designers through complex Building object during the Design. There are four part in collaborative design system. User Management system, Standard Database System, Project Database System and Interface system. All Data are recognizable format include drawing file and contents. Web/DB server supported communication and collaboration among partners in the building design and construction process. Collaborative Design system is provide new conceptual framework that exist in the Web.

• The Transactions of the Korea Information Processing Society
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• v.7 no.2
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• pp.355-364
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• 2000

Application sharing for collaborative works make multiple participants to be capable of collaborative developments through sharing development tools and applications which is distributed to various system without spatial restriction. However, applying legacy application sharing to CSCW based virtual environment has a problem because it dont consider 3D space and it disturbs the harmonic interaction of participants. In this study, we designed application sharing system for collaborative works in 3D virtual environment to share application effectively on collaborative virtual environment. The designed application sharing system for collaborative works in 3D virtual environment consist of application sharing manager, group manager and communication manager. This system is able to perceive event of 3D space about application of participant on 3D virtual environment by agent which moves to participant sites and get an ordered events and conflict among participants through scheduling. Therefore, designed application sharing system for collaborative work in 3D virtual environment can support efficient collaborative works and improve reusability of legacy application through using easily legacy application in 3D virtual environment when CSCW application development for virtual environments.

• Proceedings of the Korean Nuclear Society Conference
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• 1996.05a
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• pp.550-555
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• 1996

기존 발전소의 재장전수탱크는 격납용기 외부에 설치되어 있으며, 압력/차압 계측기를 이용하여 재장전 수탱크 수위를 측정하고 있다. 한편, 개량형 경수로기 경우에는 재장전수탱크를 격납용기 하부에 설치하도록 되어 있으므로 격납용기 벽이나 수집체적조 및 원자로 공동과 인접하게 되어 수위감시를 위한 압력/차압 계측기를 격납용기내에 설치하는 것은 매우 어려울 것으로 판단된다. 따라서, 본 논문에서는 격납용기내 재장전수탱크, 수집체적조 및 원자로 공동 수위계측기에 적용되는 미국 원자력규제위원회 및 전력연구소의 설계기준, 환경 및 기기생존 요건들을 검토한 후, 이에 따라 이 계측기들이 유지해야 할 설계 기능요건을 평가하고, 수위계측기의 형태 선정에 필요한 설계고려사항들을 파악하여 개량형 원자로의 해당 수위계측기의 선정 및 설계와 관련된 개념들을 설명하였다. 검토결과, 격납용기내 재장전수탱크 수위지시를 위해서는 압력/차압 계측기를 격납용기 외부에 설치하고, 수집체적조 및 원자로 공동의 수위감시를 위해서는 부유형 감지기를 사용하는 것이 발전소 운전 및 보수측면에서 장점이 있는 것으로 판단되어 이를 개량형 경수로 설계에 적용할 것을 제안하고자 한다.

• Tunnel and Underground Space
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• v.24 no.2
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• pp.155-165
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• 2014

Multiple thermal energy storage (TES) caverns can be used for storing thermal energy on a large scale and for a high-aspect-ratio heat storage design to provide good thermal performance. It may also be necessary to consider the use of multiple caverns with a reduced length when a single, long tunnel-shaped cavern is not suitable for connection to aboveground heat production and injection equipments. When using multiple TES caverns, the separation distance between the caverns is one of the significant factors that should be considered in the design of storage space, and the optimal separation distance should be determined based on a quantitative stability criterion. In this paper, we described a numerical approach for determining the optimal separation distance between multiple caverns for large-scale TES utilization. For reliable stability evaluation of multiple caverns, we employed a probabilistic method which can quantitatively take into account the uncertainty of input parameters by probability distributions, unlike conventional deterministic approaches. The present approach was applied to the design of a conceptual TES model to store hot water for district heating. The probabilistic stability results of this application demonstrated that the approach in our work can be effectively used as a decision-making tool to determine the optimal separation distance between multiple caverns. In addition, the probabilistic results were compared to those obtained through a deterministic analysis, and the comparison results suggested that care should taken in selecting the acceptable level of stability when using deterministic approaches.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 1997.10a
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• pp.33-36
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• 1997

본 연구에서는 공동 작업에 참여하는 작업자들의 업무흐름(workflow)을 관리하기 위한 워크플로우 엔진의 프로토타입을 개발하였다. 분산 객체관리의 표준으로 정착되어 가고 있는 CORBA(Common Object Request Broker Architecture)를 이용하여 네트워크 프로그래밍을 하였으며, JAVA를 사용하여 프로그램의 호환성과 이식성을 높였다. 또한, HAD(heterogeneous and autonomous and distributed) 환경에서 작동 가능하도록 엔진을 설계하였다. 따라서, 공동작업에 참여하는 작업자들이 플랫폼에 상관없이 네트워크를 통해 엔진에 접속할수 있으며, 워크플로우 엔진은 공동 작업을 진행 및 감독할 수 있다. 본 연구에서 개발한 시스템을 설계 작업에서의 변경요청(ECO:Engineering Change Order)이라는 업무흐름에 적용하여 보았다.

• Proceedings of the Korean Information Science Society Conference
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• 2001.04b
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• pp.442-444
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• 2001

공동작어에 참여 중인 작업자들은 공동작업 공간의 공유윈도우에서 텔리포인팅을 통해 공유객체를 추가, 변경 그리고 삭제하는 등의 작업을 행할 수 있다. 이대 작업자들은 공유객체에 대한 권한이 있어야 하면 텔리포인팅 시에 작업자의 공유객체엑세스 권한이 텔리포인터에 적용되어야 올바른 공동작업을 행할 수 있다. 본 논문은 텔리포인팅에 작업자의 공유객체액세스 권한을 적용하기 위한 텔리포인팅 모듈을 설계한다. 설계한 텔리포이팅 모듈은 기 연구된 RTP기반의 텔리포인팅 모듈에 공유객체액세스 권한관리모듈이 추가 확장된 구조이다.

• Proceedings of the Korean Geotechical Society Conference
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• 2009.09a
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• pp.1232-1235
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• 2009

공동구내 설비에 대하여 공동구 관련 설치 및 유지관리 지침이 있고 지자체별 또는 공공기관별로 법적 장치가 있으나 충분한 설계기준을 반영하지 못하고 있다. 운영중인 공동구의 관리도 지자체 시설관리공단등으로 나누어져 있어 공통되고 일괄된 설치기준이나 유지관리제도도 확립되지 못하여 비효율적이다. 본 연구에서는 공동구 설계기준과 작성과 관련하여 작성방향에 대하여 살펴보고자 하였다.