• 한국측량학회지
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• 제38권4호
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• pp.383-390
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• 2020

이동식차량측량시스템(이하 MMS)는 정밀도로지도를 제작하는데 가장 효과적인 도구이다. MMS는 다양한 센서의 조합으로 이루어져 있으며, 제조사별로 제작방법과 처리 소프트웨어가 다르기 때문에 부품의 사양만으로 성능을 예측할 수 없다. 따라서 성능평가를 통해 각 장비가 정밀도로지도 제작에 적합한지 판단을 해야 하며, 주기적인 성능평가를 위한 시설이 필요하다. 본 연구에서는 한국건설기술연구원의 SOC실증연구센터에 구축한 MMS 성능평가시설에 대해 설명하고, 문헌조사와 실험을 통해 평가시설이 갖추어야 할 조건에 대해 분석하였다.

• Membrane and Water Treatment
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• 제10권1호
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• pp.19-28
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• 2019

To minimize the impact of urbanization, accurate performance evaluation of Low Impact Development (LID) facilities is needed. In Korea, the method designed to evaluate large-scale non-point pollution reduction facilities is being applied to LID facilities. However, it has been pointed out that this method is not suitable for evaluating the performance of relatively small-scale installed LID facilities. In this study, a new design formula was proposed based on the ratio of LID facility area and contributing drainage area, for estimating the Stormwater Interception Ratio (SIR) for LID facilities. The SIR was estimated for bio-retentions, infiltration trenches and vegetative swales, which are typical LID facilities, under various conditions through long-term stormwater simulation using the LID module of EPA SWMM. Based on the results of these numerical experiments, the new SIR formula for each LID facility was derived. The sensitivity of the proposed SIR formula to local rainfall properties and design variables is analysed. In addition, the SIR formula was compared with the existing design formula, the Rainfall Interception Ratio (RIR).

• Nuclear Engineering and Technology
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• 제41권4호
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• pp.447-454
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• 2009

This paper is a technical review of the research and development results of the Korea Nuclear Instrumentation and Control System (KNICS) project and Nu-Tech 2012 program. In these projects man-machine interface system architecture, two digital platforms, and several control and protection systems were developed. One platform is a Programmable Logic Controller (PLC) for a digital safety system and another platform is a Distributed Control System (DCS) for a non-safety control system. With the safety-grade platform PLC, a reactor protection system, an engineered safety feature-component control system, and reactor core protection system were developed. A power control system was developed based on the DCS. A logic alarm cause tracking system was developed as a man-machine interface for APR1400. Also, Integrated Performance Validation Facility (IPVF) was developed for the evaluation of the function and performance of developed I&C systems. The safety-grade platform PLC and the digital safety system obtained approval for the topical report from the Korean regulatory body in February of 2009. A utility and vendor company will determine the suitability of the KNICS and Nu- Tech 2012 products to apply them to the planned nuclear power plants.

• 한국조경학회지
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• 제43권2호
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• pp.40-55
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• 2015

본 연구의 목적은 효과적인 숲유치원교육을 위한 체험형 운영방식으로서 주민자치형 유아숲체험장의 효용성을 조명하는 것이다. 이를 위해, 12개소의 서울시 유아숲체험장 중 2014년 유일하게 주민자치운영을 한 금천구 유아숲체험장에 대하여 중요도 성취도 분석을 실시하였다. 분석에 필요한 설문자료는 총 36문항으로 공간 시설영역 20문항, 운영 프로그램영역 16문항(주민자치운영영역 6문항 포함)으로 구성하고, 설문조사는 2015년 1월 12일~19일 동안 실시되었다. 설문대상자는 2014년 본 연구대상지에서 숲교육을 담당했던 숲교육전문가 15명과 숲체험 프로그램에 참여했던 19개 보육기관의 당시 인솔교사 50명으로서, 분석자료로 최종 사용된 응답지는 각각 13부, 43부이다. 연구결과, 먼저 공간 시설영역에 대한 중요도, 성취도 평균값은 각각 숲교육전문가가 4.07, 3.78로, 보육기관 교사가 4.16, 3.84로 나타났고, 운영 프로그램영역에 대한 중요도 성취도 평균값은 각각 숲교육전문가가 4.38, 4.16으로, 보육기관 교사가 4.44, 4.00으로 나타났다. 두 집단 모두 공간 시설영역을 운영 프로그램영역보다 낮게, 중요도보다 성취도를 낮게 평가하였다. 두 집단 모두 중요도 성취도가 높아 '지속적인 노력 유지'가 필요한 것으로 평가된 항목들은, 공간 시설영역으로 '접근성', '안전성', '각 공간별 숲길로의 연결성', '개별자연물', '안전시설'의 5개 항목과 운영 프로그램영역으로 주민자치 운영을 통한 '숲교육전문가의 유아행동에 대한 유연성', '숲교육전문가의 진행전문성', 숲프로그램의 '흥미성, 다양성', '유연성', '숲교육전문가의 역할'의 5개 항목으로 나타났다. '숲체험활동의 지원'을 포함한 주민자치운영영역의 항목들은 대부분 '중요하다'라는 평가를 받았지만, '지역활성화 노력'을 포함한 몇 개의 항목들이 성취도측면에서 낮게 평가되었다. 그러나 중요도에서 높은 평가를 받은 만큼, 향후 '우선시정'이 된다면 성취도측면에서 높은 평가가 예상된다. 또한 중요도 성취도 모두 높게 평가된 '숲교육전문가의 역할'을 포함한 프로그램영역이 주민자치운영으로 인해 더 실행가능할 수 있었던 항목이었음을 고려해 보았을 때, 주민자치운영은 긍정적인 평가를 받은 것으로 판단된다. 결과적으로 주민자치에 의한 운영은 체험형 숲유치원교육을 위한 유아숲체험장의 운영방식으로서 그 효용성이 있으며, 앞으로 이러한 운영방식이 '지속적인 노력'과 '우선시정'을 할 수 있는 지속성을 갖출 때, 주민자치형 유아숲체험장은 효율적인 체험형 숲유치원교육을 위한 대안이 될 수 있을 것으로 예상된다.

• 한국식품조리과학회지
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• 제22권5호통권95호
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• pp.736-745
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• 2006

The purposes of this study were to (1) identify foreigners’ evaluation of service performance, (2) define foreigners’ needs for each segment of Korean traditional restaurants, and (3) plan the adaptation strategies for Korean traditional restaurants on foreign countries. From April to July, 2005, 542 foreigners responded to an individual survey. Statistical analyses on SPSS 12.0 for Windows were performed on the survey data using descriptive statistics, factor analysis, reliability analysis, independent-samples t-test and ANOVA. The major findings from the study are as follows. First, among all the attributes, ‘Offer free additional side dishes’ scored the highest, followed by ‘taste of food is good’ and ‘temperature of food is proper’. Second, factor analysis classified the service attributes into four factors in the following order of importance: menu, sanitation, service, and facility and atmosphere. Finally, foreigner groups categorized by their general characteristics, including demographics, showed statistically differences in their evaluation. In consequence, the research findings suggest that operators of Korean traditional restaurants should understand different customers’ needs within and between customer segments.

• 한국정밀공학회지
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• 제32권7호
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• pp.591-595
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• 2015

The roller rig tester for safety performance evaluation of wheel derailment is a test facility which can give the test load condition to the test wheel, similar to the actual dynamic condition in actual running condition. This study describes the evaluation result on the durability of the resilient wheel equipped with the ring damper and the damping material, and installed in the half part of a full scaled bogie in combination with the primary spring when it rotates under the dynamic condition. The evaluation result on durability of resilient wheel after load test of 2 million cycles shows that the safety of wheel is not affected by the applied load in visual inspection and nondestructive test, however, in the bolt used for fastening the ring damper to the wheel the loosening was found. Accordingly the use of self-locking nut and washer is recommended.

• 한국초전도저온공학회:학술대회논문집
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• 한국초전도저온공학회 2003년도 추계학술대회 논문집
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• pp.324-327
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• 2003

The needs for the cryocooler which has high reliability and long MTTF are increased in the military and commercial thermal imaging system The gas contamination wear, leakage of the working fluid, fatigue and etc. have the significant effects on the reliability and MTTF(Mean Time To Failure) or MTBF(Mean Time Between Failure) of the Stirling cryocooler. In the KIMM, the Stilting cryocooler with the linear compressor was released after the several performance tests were performed. This paper describe the experimental facility for the MTTF evaluation and some typical results of the Stilling cryocooler.

• Corrosion Science and Technology
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• 제11권6호
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• pp.257-262
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• 2012

Flow accelerated corrosion (FAC) of the carbon steel piping in nuclear power plants (NPPs) has been major issue in nuclear industry. Rotating cylinder FAC test facility was designed and fabricated and then performance of the facility was evaluated. The facility is very simple in design and economic in fabrication and can be used in material and chemistry screening test. The facility is equipped with on line monitoring of pH, conductivity, dissolved oxygen(DO), and temperature. Fluid velocity is controlled with rotating speed of the cylinder with a test specimen. FAC test of SA106 Gr. B carbon steel under 4 m/s flow velocity was performed with the rotating cylinder at DO concentration of less than 1 ppb and of 1.3 ppm. Also a corrosion test of the carbon steel at static condition, that is at zero fluid velocity, of test specimen and solution was performed at pH from 8 to 10 for comparison with the FAC data. For corrosion test in static condition, the amount of non adherent corrosion product was almost constant at pH ranging from 8 to 10. But adherent corrosion product decreased with increasing pH. This trend is consistent with decrease of Fe solubility with an increase in pH. For FAC test with rotating cylinder FAC test facility, the amount of non adherent corrosion product was also almost same for both DO concentrations. The rotating cylinder FAC test facility will be further improved by redesigning rotating cylinder and FAC specimen geometry for future work.

• 한국추진공학회지
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• 제19권3호
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• pp.73-82
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• 2015

본 연구에서는 소형 액체로켓엔진을 사용하여, 약 25 km(0.025 bar) 고도의 대기압 환경을 조성할 수 있는 초음속 디퓨저와 이젝터 조합의 고공시험 설비를 구축하였으며, 설비의 성능 검증 차원에서 소형 액체로켓엔진 고공환경 모사시험을 수행하였다. 시험 설비는 고공환경 모사장치와 추진제 공급설비 그리고 냉각수 공급설비로 구성된다. 본 고공시험 설비로 약 27 km(0.021 bar) 고도에 해당하는 대기 압력을 성공적으로 구현하였으며, 이때 소형 액체로켓엔진에서 발생하는 추력 성능을 확인하였다.

• 한국유체기계학회 논문집
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• 제7권5호
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• pp.29-35
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• 2004

The turbine efficiency is an important factor in power plant, and accurate evaluation of steam turbine performance is the key issue in turbo machinery industry. The difficulty of evaluating the steam turbine performance due to its high steam temperature and pressure environment makes the most steam turbine tests to be replaced by air similarity test. This paper presents how to decide the similarity conditions of the steam turbine test and describes its limitations and assumptions. The test facility was developed and arranged to conduct an air similarity turbine performance test with various inlet pressure, temperature and mass flow rate. The eddy-current type dynamometer measures the turbine-generated shaft power and controls the rotating speed. Pressure ratio of turbine can be controled by back pressure control valve. To verify its test results, uncertainty analysis was performed and relative uncertainty of turbine efficiency was obtained.