• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 A
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• pp.318-320
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• 1999

Electric motor transforms electric power into mechanical power. It is important to increase efficiency of motor to save energy and to decrease operating cost. In this paper, some parameters and losses of high-efficiency induction motor and standard induction motor are measured by blocked-rotor test and no-load test. Operational parameters of high-efficiency induction motor that are compared with those of standard motor.

• The Journal of Asian Finance, Economics and Business
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• 제8권1호
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• pp.741-750
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• 2021

The research aims to analyze the level of efficiency by grouping banks during the period 2017 - 2018 into category 1 and category 2 banks and then dividing them as Regional Development Banks (BPD) and Non-BPD Conventional Commercial Banks (BUK) within each category. The research objects are banks within the categories BPD and BUK comprised 18 BPDs and 35 BUKs. The research methodology uses 3 stages, first, using Data Envelopment Analysis (DEA) we measure the level of bank efficiency; second, using the Tobit regression model we evaluate the effect of financial performance on DEA efficiency, and third, using the Mann-Whitney test we determine whether there is a difference in the efficiency of category 1 and 2 banks. The results showed that there was a decrease in the efficiency of category 1 and 2 banks but on average, the efficiency of category 1 banks is higher than category 2 banks. The estimation results of the Tobit regression model show that only the ROA variable affects the efficiency level of category 1 banks, while category 2 banks are influenced by NPL and ROA variables. In the Mann-Whitney test, it was proven that there were differences in efficiency between BUK and BPD in category 1 and 2 banks.

• 청정기술
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• 제14권2호
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• pp.103-109
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• 2008

본 연구에서는 솔더페이스트(solder paste)로 솔더링후 표면에 잔류하는 플럭스(flux)의 효과적인 세정성능 평가방법 개발을 목적으로 하였다. 솔더링시 플럭스의 퍼짐오차를 줄이기 위해 본 연구에서 고안한 금속치구를 이용하여 1,1,1-TCE 및 플럭스 제거용 몇 가지 대표 준수계 대체세정제에 대하여 세정시간에 따른 플럭스 제거율을 무게측정법으로 측정, 비교하였다. 세정시간 변화에 따른 각 세정제의 세정효율을 측정한 결과 측정값들의 상대표준편차(RSD)가 약 4%이하로 data의 신뢰성이 확인되었다. 따라서 솔더페이스트로 솔더링후 대체세정제의 잔류플럭스의 세정성능 평가시험에 본 연구에서 적용한 금속치구(metal test tool)를 이용한 평가방법이 유력한 방법으로 적용가능할 것으로 판단된다. 그리고 이 평가방법을 적용한 결과 현재 상용화 되어 있는 우수하다고 알려진 몇 가지 대표 준수계 대체세정제 중 ST100SX와 750H가 고활성 플럭스에 대한 세정력이 우수한 성능을 나타냈으나 기존의 1,1,1-TCE에 비해서는 현저히 떨어짐을 확인할 수 있었다.

• 반도체디스플레이기술학회지
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• 제18권3호
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• pp.42-46
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• 2019

In this paper, we introduce the novel idea to improve parallel test efficiency of semiconductor test. The idea includes the test interface card consisting of NoC structure able to transmitting test data regardless of ATE speed. We called the scheme "Multi-Clock" mode. In the proposed mode, because NoC can spread over the test data in various rates, many semiconductors are tested in the same time. We confirm the proposed idea will be promising through a FPGA board test and it is important to find a saturation point of the Multi-Clock mode due to the number of test chips and ATE channels.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2004년도 학술대회지
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• pp.268-273
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• 2004

A study on experimental method of the model test for the impulse turbine is carried out. the wave simulator is used to reproduce the real wave condition. It controls two parameter correspond to wave height and wave frequency. The optimum design which is reported by T. Setoguchi is manufactured and tested for the validation of our test facilities. The comparison of model test show that our facilities produce little bit higher efficiency at maximum efficiency point. To increase the efficiency of turbine, the new rotor with negative tip clearance is designed and being tested.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2009년도 춘계학술대회 논문집
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• pp.660-663
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• 2009

Currently in Korea, the lack of facilities and technical criteria for the performance test of small hydropower degrades the efficiency of the domestic small hydropower turbine, and makes it difficult to objectively evaluate the performance of hydro turbine. Therefore Korean institute of water and environment in K-water planned making a basis of performance test of small hydropower by using our flowmeter calibration system the largest one in Korea. We planned the maximum measurable power of hydro turbine will be 200 kW in our system. Improving the efficiency of small hydropower system can achieve the additional development benefit about 1.5 billion won per year.

• 한국유체기계학회 논문집
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• 제4권3호
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• pp.46-52
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• 2001

This paper describes a turbine test program conducted at Seoul National University(SNU). To measure blades' aerodynamic performance, either linear(2-Dimensional) or annular(3-Dimensional) cascades are often used. However, neither cascade can consider effects such as those due to rotation or rotor-stator interaction. Therefore, a rotating test facility for axial turbines has been designed and built at SNU, and its description is given in this paper. The results from an axial turbine performance test are presented. At the design point, the measured efficiency agrees with the efficiency predicted by a meanline analysis. At off design points, however, the measured and predicted efficiencies diverge. The most likely cause is hypothesized to be the inaccuracy of correlations used in the meanline analysis at off design points.

• International Journal of Reliability and Applications
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• 제7권2호
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• pp.141-153
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• 2006

In this paper, we present the U-Statistic test for testing exponentiality against new renewal better than used (NRBU) based on a goodness of fit approach. Selected critical values are tabulated for sample sizes n=5(1)30(10)50. The asymptotic Pitman relative efficiency relative to (NRBU) test given in the work of Mahmoud et all (2003) is studied. The power estimates of this test for some commonly used life distributions in reliability are also calculated. Some of real examples are given to elucidate the use of the proposed test statistic in the reliability analysis. The problem in case of right censored data is also handled.

• 한국전기전자재료학회논문지
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• 제24권6호
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• pp.440-444
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• 2011

We have analyzed electrical characteristics of spot light solar cell modules and have completed fabrication of spot light solar cell modules. Before we test modules, we have carried about UV test of hologram. As a result of test, we have obtained 165% efficiency of hologram film. the other hand, we obtained 75% efficiency of general films. After we have fabricated solar modules and carried about field test, spot light solar cell modules with hologram have been investigated 17.3 A of Isc and 155.4 W of power.

• 대한간호학회지
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• 제4권3호
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• pp.57-62
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• 1974

This study was made to assess the possibility of predicting the nurses efficiency after graduation in college through their entrance examination and general attitude test results and their academic records. It was observed that generally nurses with the highest academic records were the most efficient in their work after graduation while those with high general aptitude test results came next although their college entrance examination results were comparatively low. Therefore it could be deduced from this study that college entrance examination results alone could not be depended upon in predicting the nurse's working efficiency after bet graduation.