• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2008년도 동계학술발표대회 논문집
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• pp.405-409
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• 2008

Over 70% of the land is mountains in Korea, so that many roadways naturally includes tunnels. The air flow inside tunnel has complex characteristics, such that a new flow field is formed by following vehicles passing through the tunnel before previous flow field is stabilized. Due to these time delayed-transient characteristics, the ventilation facility requires the complex control algorithm that can handle adaptive and predictive controls. Also, it needs to be closely related to the disaster prevention system. The technology to integrate these system determines the success of TGMS. The pollutant levels exhausted from the vehicles passing through tunnel depend on vehicle years and passing velocity. They also depend on the slope and altitude of the tunnel. In order to solve this problem, an algorithm for estimating the compensating factors for calculating on design capacity of ventilation facilities was developed. Also, an integrated ventilation control algorithm with disaster prevention program to operate several tunnels was developed based on TGMS.

• 한국가스학회지
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• 제12권3호
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• pp.1-6
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• 2008

갈수록 성장하고 있는 LNG 산업에 있어서 안전관리는 필수적인 요소로 자리잡아가고 있다. 이에 따라 기존의 LNG 저장/수송 시설에 대한 안전 관리를 보다 발전시킬 수 있는 것이 필요하며 최근 발전된 IT 산업은 LNG 저장/수송 시설에 대한 통합 안전관리 시스템을 가능케 했다. 위험성 평가/분석 기술, 폭발, 누출 및 확산 모델 구축 기술, 실시간 모니터링 및 이상 진단 기술, Data reconciliation을 통한 공정 정보 신뢰성 향상 기술 등을 집약하며 웹 환경을 통하여 구축될 통합 안전관리 시스템은 LNG 산업의 안전성 향상과 향후 기술 수출에 큰 기여를 할 것이다.

• 한국소음진동공학회논문집
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• 제22권6호
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• pp.574-581
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• 2012

Condition-based maintenance(CBM) has been used as a useful concept for optimizing maintenance plan and decreasing maintenance cost in several kinds of plant sites. This study introduced an example that developed an integrated management system for maintenance parameters and hydraulic turbine of hydro-power plant in order to improve its maintenance strategy as applying CBM techinique. The integrated management system consists of three parts. One is a hardware part including PDA inspection system and several kind of precision measuring instruments. Another is a vibration monitoring system on hydraulic turbine. The other is a software part that takes charge of making hierarchy tree of maintenance parameters and their inspection route, managing accumulated database, assessing health condition of components, and supporting interface with other enterprise management system. The system has been installed at Chuncheon hydro-power plant for test and demonstration. It is expected that the system can contribute database construction for diagnostics and prognostics on facility health condition and systematic accumulation of know-how on operation and maintenance of plant.

• Nuclear Engineering and Technology
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• 제55권7호
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• pp.2642-2649
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• 2023

A real-time unmeasured dynamic response prediction process for the nuclear power plant pressure pipeline is proposed and its performance is tested in the test-loop system (KAERI). The aim of the process is to predict unmeasurable or unreachable dynamic responses such as acceleration, velocity, and displacement by using a limited amount of directly measured physical responses. It is achieved by combining a well-constructed finite element model and robust inverse force identification algorithm. The pressure pipeline system is described by using the displacement-pressure vibro-acoustic formulation to consider fully filled liquid effect inside the pipeline structure. A robust multiphysics modal projection technique is employed for the real-time sensor synchronized prediction. The inverse force identification method is also derived and employed by using Bathe's time integration method to identify the full-field responses of the target system from the modal domain computation. To validate the performance of the proposed process, an experimental test is extensively performed on the nuclear power plant pressure pipeline test-loop under operation conditions. The results show that the proposed identification process could well estimate the unmeasured acceleration in both frequency and time domain faster than 32,768 samples per sec.

• Nuclear Engineering and Technology
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• 제55권11호
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• pp.4125-4133
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• 2023

The transportation of spent nuclear fuel is an important process that involves road and sea transport from an interim storage facility to storage and final disposal sites. As spent nuclear fuel poses a significant risk, carefully evaluating its vibration and shock characteristics under normal transport conditions is essential. In this regard, full-scale multi-modal transport tests (MMTT) have been conducted domestically and internationally. In this paper, we discuss the process of developing a multi-body dynamics (MBD) model to analytically simulate conditions that cannot be considered in tests. The MBD model is based on the KORAD-21 transportation system was validated using the Korean MMTT results from 2020 to 2021. This paper summarizes the details of the development and verification of the MBD model for the KORAD-21 transportation system under normal transport test conditions. This approach can be applicable to various transportation scenarios and systems, and the results of this study will help to ensure that nuclear fuel transportation is conducted safely and effectively.

• 한국인터넷방송통신학회논문지
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• 제18권3호
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• pp.159-166
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• 2018

본 논문은 스마트 공자의 모니터링을 위한 제조설비 시각화 시스템을 소개한다. 최근 기술 발달의 가속화와 제 4 차 산업혁명, Industry 4.0등과 같은 용어가 등장함에 따라 기존 제조공장의 스마트화를 위한 기술들이 조명되고 있다. 제조공장을 실시간으로 모니터링 함으로써 생산성 향상 및 의사결정의 도움을 줄 수 있는 생산관리 시스템은 스마트 팩토리를 위한 중용한 기술 중 하나가 되며, 더 정확한 모니터링 및 응용 기술을 위한 디지털 트윈 기술의 적용 또한 중요한 이슈가 되고 있다. 그러나 디지털 트윈 구현을 위해서는 여러 제조사의 설비 데이터를 통합할 수 있는 통합 인프라가 필요하다. 따라서 본 논문은 이기종의 설비 데이터 수집 및 모니터링을 위한 국제 표준 프로토콜 기반의 데이터 수집 시스템을 활용해 설비의 실시간 정보를 확인할 수 있는 시각화 프로그램을 설계하고 개발한다. 이를 통해 하나의 공장에서 여러 제조사의 설비 데이터들을 통합하고 실시간으로 확인 할 수 있도록 한다.

• Nuclear Engineering and Technology
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• 제49권7호
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• pp.1537-1546
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• 2017

Many thermal-hydraulic tests have been conducted at the Korea Atomic Energy Research Institute for verification of the SMART (System-integrated Modular Advanced ReacTor) design, the standard design approval of which was issued by the Korean regulatory body. In this paper, the contributions of these tests to the standard design approval of SMART are discussed. First, an integral effect test facility named VISTA-ITL (Experimental Verification by Integral Simulation of Transients and Accidents-Integral Test Loop) has been utilized to assess the TASS/SMR-S (Transient and Set-point Simulation/Small and Medium) safety analysis code and confirm its conservatism, to support standard design approval, and to construct a database for the SMART design optimization. In addition, many separate effect tests have been performed. The reactor internal flow test has been conducted using the SCOP (SMART COre flow distribution and Pressure drop test) facility to evaluate the reactor internal flow and pressure distributions. An ECC (Emergency Core Coolant) performance test has been carried out using the SWAT (SMART ECC Water Asymmetric Two-phase choking test) facility to evaluate the safety injection performance and to validate the thermal-hydraulic model used in the safety analysis code. The Freon CHF (Critical Heat Flux) test has been performed using the FTHEL (Freon Thermal Hydraulic Experimental Loop) facility to construct a database from the $5{\times}5$ rod bundle Freon CHF tests and to evaluate the DNBR (Departure from Nucleate Boiling Ratio) model in the safety analysis and core design codes. These test results were used for standard design approval of SMART to verify its design bases, design tools, and analysis methodology.

• 대한공간정보학회지
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• 제10권2호
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• pp.19-27
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• 2002

본 논문은 시설물 관리에서 시스템분석과 업무분석으로 인터넷기반 시설물 관리 시스템을 개발하고 AHP모델을 시스템에 도입하여 원활한 시설물관리기법을 제시하는데 있다. 기존의 공간분석과 연산은 정확성의 기준이 불분명하며 단순한 수준의 출력만을 하기 때문에, 의사결정을 위한 지리적자료에 대한 정확한 분석을 위해서는 통계적인 분석이 필요하였으며, 관리자위주의 시스템은 사용자의 욕구를 충족시키지 못하였다. 그리고, 인터넷 GIS 기반의 분석적 요구 사항을 충족시켜줄 수 있는 일련의 공간통계분석기법들을 GIS로 공간분석기능으로 구조화시키기 위해서는 기존의 일반통계 모듈과 인터넷 GIS의 통합 또는 인터페이스의 구성이 필요하다. 따라서, 본 연구에서는 시설물의 장기적인 유지관리에 있어서 인터넷 GIS 기술도입의 필요성을 제시하고 의사 결정에서 AHP모델의 적용가능성을 제시하였다.

• 한국물환경학회지
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• 제36권5호
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• pp.453-467
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• 2020

This study aimed to inventory the water pollutant discharge of wastewater from two facilities, one primary steel manufacturing facility and one petroleum refinery, both of which are located in Korea, and to identify ways to improve the wastewater treatment process through field investigation. Probability evaluation was used to inventory the substances in polluted water. The samples collected in this study included original wastewater, on processing wastewater, and treated water. The general description of wastewater occurrence, major sources, and treatment facilities were also investigated to obtain an integrated database of the pollutants created by different industrial categories. Based on our analysis of raw wastewater and final effluent, the detected pollutants were confirmed by analyzing their presence in the raw or supplemental materials, the potential of formation as byproducts, and the possibility of inclusion as impurities. The compounds detected for each category were screened via investigation of their possible sources and confirmed as the final water pollutant inventories. Thirty kinds of water pollutants were emitted by the primary steel manufacturing facility (reference in case A), including 14 specified hazardous water pollutants. The petroleum refinery (reference in case B) emitted 36 water pollutants, including 16 specified hazardous water pollutants.

• 한국건설관리학회논문집
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• 제16권2호
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• pp.97-105
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• 2015

건설산업에 BIM이 확대 적용되어 감에 따라, 건축물 유지관리에 BIM을 적용하기 위한 연구개발이 활발하게 진행되고 있다. 하지만, 건축물 전 생애주기를 고려한 BIM기반 건축물 요구정보의 입력과정은 초기 설계단계에서부터 전문가에 의하여 유지관리를 고려한 수작업의 개입이 요구되며, 단계별 및 주체별로 시설물 유지관리 요구정보의 입력항목이 구분되어 있지 않아, 실무에서 이를 모두 입력 하는 데에는 많은 어려움이 있다. 또한, 유지관리 요구정보는 IFC (Industry Foundation Classes)기반의 건물 모델파일과 직접적으로 연계될 수 있으나, 일반 사용자가 유지관리단계를 고려한 IFC 파일을 생성 하는 데에는 정보입력의 수준 및 범위에 대하여 한계가 있다. 이에 본 연구에서는 프로젝트 진행 단계별 BIM정보 전달과정의 비효율성을 최소화하고 복합객체에 대한 속성정보의 통합적인 관리를 위하여, BIM기반 복합객체에 대한 속성정보의 통합관리 방안을 제안한다. 본 연구를 통하여, 단계별로 다르게 적용되는 BIM정보의 개발상세수준에 따라 개별 제품정보를 통합적으로 관리하는 것이 가능하여, 단계별로 진행되는 BIM기반 데이터 분석과정에서 발생할 수 있는 속성정보에 대한 혼란을 제거하여 적정한 속성정보의 활용 및 분석결과의 신뢰성과 정확성을 확보할 수 있다.