• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.6
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• pp.18-27
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• 2020

This study compared and analyzed the results of proficiency testing between testers based on the international standard ISO/IEC 17043 proficiency testing requirements using ISO/IEC 25023 software quality characteristics evaluation. Application of the test was submitted to the KASTO as a software test in the electric test field defined by KOLAS. Among ISO/IEC 25023, the evaluation items for proficiency testing between testers were selected as functional completeness and time behavior. The comparison test between testers was carried out on May 28, 2019 at the accredited LG Electronics SW Laboratory in Seoul and attended by KOLAS assessors. The test evaluation method was measured once per tester with functional completeness, and measurement was repeated 10 times per tester according to time behavior. As a result, in the case of functional completeness, all 12 test steps were passed, and the satisfaction was evaluated. Time behavior was repeated 10 times, and the mean was 9.45 ± 0.01 seconds for testers 1 and 3 and 9.52 ± 0.0 seconds for tester 2, but there was no statistically significant difference. In conclusion, the proficiency of the testers was equal, and the reliability of the test results of the test institute was confirmed.

• 전기의세계
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• v.9
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• pp.72-77
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• 1962

본 시험소는 을지로 6가를 지나 신당동 네거리에서 북으로 2백리 떨어진 곳에 위치하고 있으며, 고유대지는 3,618평, 건축평수는 977평에 달하는 비교적 광대한 지역을 차지하고있고, 주위도 비교적 조용하여 시험소로서의 입지조건이 대단히 유리하도고 단정할 수 있다. 본 고에서는 연혁, 건축배치 및 대지,직원, 시설 및 능력에 대해 서술하고자 한다.

• The Journal of the Korea institute of electronic communication sciences
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• v.5 no.5
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• pp.435-443
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• 2010

When testing systems that incorporate probabilistic behavior, it is necessary to apply test inputs a number of times in order to give a test verdict. Interval estimation can be used to assert the correctness of probabilities where the selection of confidence interval is one of the important issues for quality of testing. The Wald interval has been widely accepted for interval estimation. In this paper, we compare the Wald interval and the Agresti-Coull interval for various sizes of samples. The comparison is carried out based on the test pass probability of correct implementations and the test fail probability of incorrect implementations when these confidence intervals are used for probability testing. We consider two-sided confidence intervals to check if the probability is close to a given value. Also one-sided confidence intervals are considered in the comparison in order to check if the probability is not less than a given value. When testing probabilities using two-sided confidence intervals, we recommend the Agresti-Coull interval. For one-sided confidence intervals, the Agresti-Coull interval is recommended when the size of samples is large while either one of two confidence intervals can be used for small size samples.

• Economic and Environmental Geology
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• v.53 no.2
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• pp.121-131
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• 2020

In this paper, the transmissivities obtained from the pulse test, the slug test and the constant head test were compared each other to assess an applicability and a reliability of the hydrogeological test method, which are commonly used to derive the hydrogeological properties of a crystalline rock at un underground research facility. When comparing the results of the pulse test and the slug test, the transmissivities were very similar in the entire test section of the medium. However, there was a little discrepancy in the results in the areas where the permeability is relatively high. The results of the constant head test on the same section showed the lower transmissivity than the results of the pulse test and the slug test on the highly permeable section. This difference in permeability was considered to be due to the difference in the radius of the hydraulic effect applied in each hydraulic test. When the heterogenetic distribution of fracture affects the hydrogeological properties on crystalline rock, it is believed that the hydrogeological characteristics can be explained through a constant head test or a constant flow rate test with a large hydraulic effective radius, as well as a pulse and a slug test that can identify hydrogeological properties in a relatively short time.

• Journal of the Korean Society of Marine Environment & Safety
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• v.27 no.6
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• pp.744-753
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• 2021

This study suggests ways to improve the standard test method and judgment criterion for the "Eco-toxicity Test" based on the rules and regulations provided in 'performance and qualifying test standards for marine pollution prevention materials and chemicals' in the Republic of Korea. Compared with the relevant references of other countries, this study attempted to find the limitations in the existing standards. As for the growth inhibition test of algae using Skeletonema costatum as an indicator, applying comparative analysis to measure specific growth rates, together with statistical analysis, instead of applying current methods, judged by the appearance of colors from the culture medium was suggested. Considering the exponential growth phase of the test species, the test duration was suggested to be reduced to less than four days. For the test with fish as an indicator, resetting the appropriate body size was suggested to, show consistent sensitivity against chenicals applied during testing. Furthermore, it is necessary to consider the criteria needs, which should be established in reasonable and objective ways. For the testing species, marine rotifer, Brachionus plicatilis could be a replacement for Artemia sp., and a bivalve for fish in the test. To improve the performance effectiveness of the "Eco-toxicity test", it is worth considering the designation of accredited testing institutes, by placing it in the same loop. Thus it is also expected to have a reliable management system in place, having the capacity of cost calculation properly and adjusting testing items if required.

• Magazine of the Korea Concrete Institute
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• v.9 no.6
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• pp.147-156
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• 1997

지금까지 국내에서는 콘크리트의 크리프에 관한 실험적 연구가 많이 진행되지 못하여 해당 구조물의 설계기술 도입국의 규준에 따라 크리프를 예측해왔다. 그러나 예측된 크리프 모델이 국내 콘크리트 재료의 특성에 적합한지에 대한 실험적 검증은 제대로 이루어지지 않고 있는 실정이다. 본 연구에서는 국내에서 프리스트레스 콘크리트 구조물에 적용하는 실용 고강도 콘크리트의 크리프 값을 예측하기 위해 동일한 설계기준강도를 갖는 세 가지 배합에 대하여 재령별로 크리프 시험을 수행하고 이 실험결과를 ACI, CEB/FIB, KSCE, JSCE규준들의 크리프 예측식과 비교 분석하였다.시험결과와 이들규준들에 대한 비교분석에 의하면 CEB/FIB-90 크리프 예측식은 비교적 과대 평가되고 ACI 209-92와 JSCE-96의 경우는 과소 평가되었으나 콘크리트 표준시방서 KSCE -96 크리프 예측식은 비교적 시험결과에 근접하는 것으로 평가되었다. 그러나 구성재료의 양적 변동에 '따른 배합별 시험결과의 차이를 반영할 수 있는 점이 보완되어야 할 것으로 보며 향후 많은 실험결과를 바탕으로 국내에서 생산되는 콘크리트에 대하여 보다 정확히 크리프를 예측할 수 있는 연구가 필요하다.

• Journal of the Korean GEO-environmental Society
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• v.14 no.9
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• pp.5-12
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• 2013

In this study, each top-down load test and bi-directional load test has been performed on the 480mm diameter of two rock socketed drilled shafts, which are located next to each other, and the results have been compared. The result shows that the settlement from the equivalent load-settlement curve of bi-directional load test is smaller than one from top-down load test, because elastic is not considered in equivalent load-settlement curve of bi-directional load test. Therefore elastic shortening should be considered to obtain appropriate equivalent load-settlement curve. Three existing methods used to obtain equivalent load-settlement curve with consideration of elastic shortening has been compared with the result of top-down load test. The result shows that those existing methods are sufficiently applicable to the design. In addition, result of comparison between top-down load test and bi-directional load test shows that bi-directional load test was found to overestimate bearing capacity because it does not consider pile body failure.

• Proceedings of the KIEE Conference
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• 2006.07a
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• pp.506-507
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• 2006

1986년 제조되어 국내 지중배전계통의 관로에서 20년간 사용된 CNCV케이블에 대하여 IRC(Iso-thermal Relaxation Current) 측벙법을 사용하는 진단장비와 0.1Hz 극저주파 Tan-delta 측정법을 사용하는 진단장비로 케이블의 수트리 열화 진단을 시행하고 철거한 후 교류파괴전압시험을 수행하였다 각 진단장비의 진단결과와 교류파괴전압시험 결과, 수트리의 존재여부를 비교하였다. VLF Tan-delta 측정법을 사용하는 진단장비가 교류파괴전압시험결과, 수트리의 유무 둥과 상관성이 비교적 높게 나타났다. 통계적으로 신뢰성을 확보할 수 있도록 지속적인 비교 검증시험을 추진할 계획이다.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2011.04a
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• pp.94-99
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• 2011

원자력 발전소에 사용되는 케이블은 화재발생시 화재전파를 억제하기 위해 일정수준의 화염시험을 만족한 것을 사용하도록 규정되어 있다. 이러한 케이블 화염시험 기준은 나라마다 약간씩 차이가 있는데 본 논문에서는 국내와 미국, 프랑스, 캐나다의 원자력 발전소 케이블 화염시험 기준의 국가별 차이점을 비교 분석 하였다. 비교분석결과 각 나라의 케이블 화염시험 코드는 세부 항목별로 약간씩 차이가 있으나 전체적으로 모든 코드가 동등한 수준의 기준을 갖고 있는 것으로 분석 되었다. 따라서 어느 하나의 코드를 만족하는 전기케이블은 다른 코드의 요구 사항을 만족하는 것으로 볼 수 있다.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2011.05a
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• pp.68-69
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• 2011

마그네슘 판재의 온간 스프링백 거동 예측을 위한 재료 거동 모델을 고찰하였다. V-굽힘 시험에 관한 기존 문헌의 결과와 비교하여 재료 모델의 타당성을 토하였다. 스프링백 거동의 정량화를 위해 온간 S-rail 프레스금형에 의한 성형 시험을 수행하였다. 성형 시험은 다양한 온도, 속도, 성형깊이 조건에서 수행하였으며 시험 결과를 서로 비교하였다. 재료 모델을 사용하여 S-레일 성형에 따른 스프링백 예측을 위한 유한요소해석을 수행하고 그 결과를 시험 측정값과 비교하였다. 이로부터 재료 모델의 한계와 가능성을 고찰하였다.