• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2003년도 제20회 춘계학술대회 논문집
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• pp.193-196
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• 2003

The KSR-III developed by KARI is the first rocket vehicle which is adopting the liquid propellant rocket engine system in Korea and its flight test was successfully done last year. KSR-III is a sounding rocket class launch vehicle, but there is a sense to accomplish design, manufacture, performance test and finally its flight test by domestic technology. In this paper, the authors are intended to introduce the multi-purpose test facility(PTA-II Test Facility) which is constructed for the variety of tests on KSR-III feeding system(single component tests, verification tests, cold flow tests and combustion tests) and its test results.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 제39회 하계학술대회
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• pp.2230-2231
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• 2008

최근에 국제유가의 급상승과 코토의정서 발의에 따른 대외적인 환경여건 변화로 인해 국내에서는 재생에너지 보급사업 및 에너지절감기술 관련 정책과 신기술이 활발히 추진되고 있다. 본 논문에서는 전기설비간의 주 동맥인 케이블 선정에 있어 케이블 굵기를 달리 하는 조건에 따라 전력손실량 변화의 실험값을 모의시험장치를 이용하여 취득하였고 이를 비교분석함으로 써 케이블 부문에서 에너지절감의 이론적 근거를 실증하였다. 또한, 수자원공사 수도사업장 중 취수장 전력시스템을 모델로 전력계통해석프로그램(PTW)을 이용하여 케이블 굵기 변화에 따른 전력손실량 변화를 모의하고 경제성분석을 통해 기존 케이블의 굵기 선정 방법을 재 고찰하고자 한다.

• 한국우주과학회:학술대회논문집(한국우주과학회보)
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• 한국우주과학회 2004년도 한국우주과학회보 제13권2호
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• pp.262-265
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• 2004

As a cryogen, LOx is a light blue, odorless, transparent liquid. Also it is not shock sensitive and does not decompose. However, it is a strong oxidizer and will vigorously support combustion. Therefore all harmful contaminants (such as grease, oil, fingerprint and organic materials) that could cause malfunctions, fires, or explosions in a oxygen environments must be completely removed prior to the introduction of oxygen. Especially, grease ingredient located inside of the LOx supply line, pipe and PHS (Pneumo-Hydraulic System) part can make drastic chemical reaction with oxygen. Therefore, to protect rapid reaction such as explosion, grease ingredient must be surely eliminated by a regular and irregular degreasing. Study on the availability, effectiveness and selection of degreasing detergents and method is described in this paper, and it will be useful for the construction and management of IPP test facility.

• 한국철도학회논문집
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• 제10권3호
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• pp.306-312
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• 2007

This paper presents the optimal design method of the train repair facility based on the simulation analysis. The train is divided into the power car, motorized car and passenger car for the simulation process analysis and train repair facility is composed of each subsystems such as a blast, dry and wash workshop. In simulation analysis, we consider the critical (dependent) factors and design (independent) factors for the optimal design. Therefore, a simulation optimization uses Evolution Strategy (ES) in order to find the optimal design factors. Experimental results indicate that simulation design factors are sufficient to satisfy the conditions of dependent variables. The proposed analysis method demonstrates that simulation design factors determined by the simulation optimization are appropriate for real design factors in a real situation and the accuracy and confidence for the simulation results are increased.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2021년도 봄 학술논문 발표대회
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• pp.172-173
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• 2021

In recent, unmanned Aircraft Systems (UAS) have been widely used for various purposes, such as safety inspection, facility condition inspection, progress monitoring, in the architecture engineering, and construction (AEC) industry. This technology can provide visual assets regarding the conditions of construction jobsites as well as constructed facilities during flying over the point of interests. With the significant interests in this advancement, the recent studies have presented how the UAS can be applied fro different types of facilities (e.g., buildings, power genereation systems, roads, or bridges) to inspect the current conditions of them for safe operations as well as public's safety. This study reviewed the receent studies to document their scientific findings and practical contributions, as well as provided the overview of further implications for future studies.

• 방사성폐기물학회지
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• 제21권3호
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• pp.329-345
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• 2023

This paper described a method for analyzing the structural performance of a metal container used for disposing radioactive waste generated during the decommissioning of a nuclear power plant, and numerical analysis results of a method for reinforcing the container. The containers to be analyzed were those that can be used in near-surface and landfill disposal facilities scheduled to be operated at the Gyeongju radioactive waste disposal facility. Structural reinforcement of the container was performed by lattice reinforcement, column reinforcement, and bottom plate reinforcement. Accordingly, a total of 14 reinforcement cases were modeled. The external force causing damage to the container was set equivalent to the impact of a 9-m fall, accounting for the height of the vault at the near-surface disposal facility. The reinforcement methods with a high contribution to the structural performance of the container were concluded to be lattice and column reinforcements.

• 센서학회지
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• 제9권3호
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• pp.213-223
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• 2000

원자력 관련시설이나 우주 공간, 방사선 치료 센터 등에서 발생되는 방사선량은 정확히 검출되어야 할 필요성이 있다. 본 논문에서는 상용 P채널 Power MOSFET(metal oxide field effect transistor)를 방사선 누적선량 모니터링 센서로 활용하기 위해 실시간 방사선량 검출 측정 시스템을 설계 제작하였고, 시스템의 성능을 분석하기 위하여 Co-60 $\gamma$선원을 갖춘 고준위 조사시설에서 조사한 후 출력특성의 변화를 분석하였다. 방사선 조사실험 결과 P채널 Power MOSFET은 조사된 누적 방사선량에 비례하여 문턱전압($V_T$)이 변화됨과 곡선 변화의 선형적 특성을 지님을 알 수 있었다. 이 선형 함수관계를 이용하여 저가의 상용 P채널 Power MOSFET를 사용한 방사선 총 누적선량을 모니터링하기 위한 센서로 사용할 수 있음을 확인하였다.

• 한국정보전자통신기술학회논문지
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• 제13권6호
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• pp.562-567
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• 2020

본 논문은 저장 탱크용 임시전력설비를 보호하기 위한 목적으로 특히 변압기를 감시하고 절연파괴 등과 같은 고장을 차단하고 보호하기 위한 보호계전기 정정에 관한 연구이다. 전력계통에 단락 또는 지락고장 등과 같은 이상이 발생하였을 때 이를 검출하여 고장이 발생한 기기 및 설비를 신속하게 차단하고 전력계통으로부터 분리하여 전력공급에 지장이 없도록 하여야 한다. 전력계통의 이상 상태를 빠르고 정확하게 감지할 수 있는 보호계전기의 정정이 중요하다. 또한 보호협조를 위해 고장종류와 고장의 원인을 정확히 적용한 고장전류 계산이 보호계전기 정정에 가장 중요한 요소이다. 저장 탱크용 임시전력설비 보호를 위해 적용하는 과전류계전기, 지락과전류계전기, 부족전압계전기, 지락과전압계전기 등이 보호협조가 가능하도록 보호계전기 정정 방법에 대해 연구하였다.

• Nuclear Engineering and Technology
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• 제54권4호
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• pp.1253-1260
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• 2022

This paper reports the control method for the core power of the China initiative Accelerator Driven System (CiADS) facility. In the CiADS facility, an intense external neutron source provided by a proton accelerator coupled to a spallation target is used to drive a sub-critical reactor. Without any control rod inside the sub-critical reactor, the core power is controlled by adjusting the proton beam intensity. In order to continuously change the beam intensity, an adjustable aperture is considered to be used at the Low Energy Beam Transport (LEBT) line of the accelerator. The aperture size is adjusted based on the Proportional Integral Derivative (PID) controllers, by comparing either the setting beam intensity or the setting core power with the measured value. To evaluate the proposed control method, a CiADS core model is built based on the point reactor kinetics model with six delayed neutron groups. The simulations based on the CiADS core model have indicated that the core power can be controlled stably by adjusting the aperture size. The response time in the adjustment of the core power depends mainly on the adjustment time of the beam intensity.

• Journal of Electrical Engineering and Technology
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• 제1권3호
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• pp.359-365
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• 2006

Since the start of the KSTAR (Korea Superconducting Tokamak Advanced Research) project, Instrumentation and Control (I&C) of the Neutral Beam Test Facility (NB-TF) has been striving to answer diverse requests arising from various facets during the project's development and construction phases. Hard-wired electrical circuits have been designed, tested, fabricated, and finally installed to the relevant parts of the system. In relation to the vacuum system I&C, controlling functions for the rotary pumps, a Roots pump, two turbomolecular pumps, and four cryosorption pumps have been constructed. I&C for the ion source operation are the temperature and flow rate signal monitoring, Langmuir probe signal measurements, gradient grid current measurements, and arc detector circuit. For the huge power system to be monitored or safely operated, many temperature measurement functions have also been implemented for the beam line components like the neutralizer, bending magnet, ion dump, and calorimeter. Nearly all of the control and probe signals between the NB test stand and the control room were made to be transmitted through the optical cables. Failures of coolant flow or beam line vacuum pressure were made to be safely blocked from influencing the system by an appropriate interlock circuit that will shut down the extraction voltage application to the system or prevent damages to the vacuum components. Preliminary estimation of the beam power through the calorimetric measurement shows that 87.9% of the total power of the 60kV/18A beam with 200 seconds duration is absorbed by the calorimeter surface. Most of these I&C results would be highly appropriate for the construction of the main NBI facility for the KSTAR national fusion research project.