• 제목/요약/키워드: Round robin test

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지반응답해석 Round Robin Test 결과 종합적 분석 연구 (Comprehensive Evaluation of Results of Ground Response analysis Round Robin Test)

  • 박두희;윤종구;박영호;안창윤;김재연
    • 한국지반공학회:학술대회논문집
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    • 한국지반공학회 2007년 가을학술발표회
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    • pp.334-344
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    • 2007
  • This paper performed a comprehensive evaluation of the results of the 2007 Ground Response Analysis Round Robin Test, at which 14 institutions and individuals participated. The submitted results showed significant discrepancies. The main reason for this difference has been attributed to the dispersion in the estimated shear wave velocity profiles and dynamic soil curves. It is therefore concluded that accurate evaluation of the material properties is of primary importance for reliable estimation of the ground vibration. Evaluation of the effect of the analysis method showed that the equivalent linear analysis overestimates the peak ground acceleration, but overall the results are similar to a total stress nonlinear analysis. However, the total and effective stress nonlinear analyses show distinct discrepancies, the effective stress analyses consistently resulting in a lower response due to the development of the excess pore water pressure and thus softer response.

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Round Robin Test 기법을 통한 다양한 지반응답해석 접근법 비교 연구 (A Comparative Study of Various Approaches of Seismic Ground Response Analyses by Using a Round Robin Test Methodology)

  • 김진만;박요환;김기석;박두희;선창국;김성렬
    • 한국지반공학회:학술대회논문집
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    • 한국지반공학회 2007년 가을학술발표회
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    • pp.259-265
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    • 2007
  • The technical committee of Soil Dynamics and Geotechnical Earthquake Engineering of Korean Geotechnical Socity has conducted Round Robin Test(RRT) on seismic ground response analyses in 2007. Total 14 participating teams were given exact same soil information of three sites and three input ground motions including two recorded ground motions and one synthetic ground motion. Each team selected its own analysis method and approaches to perform ground response analyses. There were equivalent linear, nonlinear total stress, and nonlinear effective stress approaches, which could be selected. The results from RRT were systematically analyzed and dispersion and variation due to analysis methods, input ground motions, shear velocity profiles, shear modulus reduction curves, damping curves, and other input data are reported by the companion papers.

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로크웰 경도도 순회 비교측정 결과에 대한 분석 (Analysis on the Results of the Rockwell Hardness Round Robin Test)

  • 방건웅;탁내형
    • 열처리공학회지
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    • 제14권5호
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    • pp.275-281
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    • 2001
  • To improve the reliability of hardness test results, Rockwell hardness round robin test was carried out for 10 laboratories. The test condition was the same with the ISO(International Standards Organization) standards. Korea Research Institute of Standards and Science(KRISS) supplied the hardness standard blocks and an indenter to laboratories for the measurement. The participating laboratories measured hardness of the specified areas on the blocks for 6 times with their own indenter as well as common indenter, respectively, and reported the results to KRISS. The result showed that quite large amount of the differences came from the indenter and it is necessary to change indenter with better quality for improved reliability in hardness measurement.

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Model for Predicting Ultrasonic NDE Reliability and Statistical Data Analysis of Piping Inspection Round Robin

  • Park, Ik-Keun;Kim, Hyun-Mook
    • International Journal of Reliability and Applications
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    • 제5권1호
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    • pp.25-36
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    • 2004
  • Ultrasonic inspection system consist of the examination procedures, equipment, and operators. The reliability of nondestructive testing is influenced by the inspection environment, materials and types of defect. It is very difficult to estimate the reliability of NDT due to the various factors. Piping inspection round robin was conducted to quantify the capability of ultrasonic inspection during in-service. In this study, the models for predicting the ultrasonic NDE reliability by logistic model and linear regression model are discussed. The utility of the NDT reliability assessment is verified by the analysis of the data from round robin test with these models.

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원전감육배관 UT 두께측정 결과의 신뢰도 평가를 위한 다자비교시험 (Round Robin Test for Reliability Evaluation of Ultrasonic Thickness Measurement Results in Nuclear Power Plant Pipelines)

  • 이승준;이원근;이준현;이성호
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2007년도 춘계학술대회A
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    • pp.1702-1707
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    • 2007
  • The reduction of pipe-thickness induced by flow accelerated corrosion (FAC) is one of the most serious problems on the maintenance of piping system in nuclear power plants (NNP). If the thickness of a pipe component is reduced below the critical level, it cannot sustain pressure and consequently results in leakage or rupture. For this reason, wall thinning by FAC has been inspected in secondary side piping systems in NPPs. In this research Round Robin Test (RRT) was conducted to verify confidence of wall thinning measurement system in NPP. 12 inspectors from 3 companies participated and 23 specimens were used according to standard practice in RRT. The gage R&R analysis was introduced in regard to repeatability and reproducibility that are affected to measurement system errors. Confidence intervals of thickness measurement system were obtained.

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실용고온초전도테이프의 교류손실에 대한 Round-robin테스트 (Round-robin Test on AC Losses in a Technical High-Tc Superconducting Tape)

  • 류경우;최병주;황시돌
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
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    • 제53권7호
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    • pp.437-443
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    • 2004
  • In this work the AC loss measurement setup based on an iron core background magnet, not used in a conventional one, has been successfully developed. To prove its validity, a round-robin test for the same Bi-2223 tape sample among three institutes has been done. The results show that the self-field and magnetization losses from the developed setup well agree with the losses measured at two other institutes of Korea Basic Science Institute and Yokohama National University. The measured magnetization losses for parallel or perpendicular fields can be well predicted from the slab model or the strip model for a filamentary region. However the magnetization losses for longitudinal fields can be rather predicted by the slab model for a decoupled filament. The self-field losses are well explained by the Norris ellipse model.

라운드로빈 부하균형을 통한 웹 서버 클러스터 고속화 처리기법 (A high speed processing method of web server cluster through round robin load balancing)

  • 성경;김석수;박길철
    • 한국정보통신학회논문지
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    • 제8권7호
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    • pp.1524-1531
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    • 2004
  • 본 논문에서는 라운드 로빈 알고리즘을 적용한 부하균형기법을 보이고 있다. 이를 위하여 2개의 패키지(패킷 캡춰와 라운드로빈 테스트 패키지)를 구현하였으며, 이러한 구현 패키지 S/W에 의해 본 연구 실험의 가상연결구조(데이터 생성기, 가상서버, 서버1,2,3) 에서 발생하는 패킷의 량을 측정한 것으로 서버1,2,3으로 트래픽 분산여부를 파악할 수 있었으며, 구현된 라운드로빈 부하균형 모니터링 시스템의 기능으로는 데이터의 수신량, 패킷량 표현, 패킷량 그래프 표현, 라운드 로빈 테스트, 시스템 모니터링 기능이 있다. 실험결과는 들어오는 데이터의 크기가 많이 차이나지 않는 이상 라운드 로빈 알고리즘은 확실한 형태의 트래픽 분산을 가능하게 해주었다 그리고 일부분에서 오차가 심한 경우도 있지만 횟수를 거듭하고 테스트가 장기화 될수록 오차는 줄어들었다.

차음성능에 관한 국제간 round robin test (International round robin. test on sound insulation performance)

  • Kang, Hyun-Ju;Kim, Jae-Seung;Kim, Hyun-Sil;Kim, Bong-Kee;Kim, Sang-Ryul
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2001년도 춘계학술대회논문집
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    • pp.1174-1179
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    • 2001
  • 차음성능 측정에 관한 국제간 신인도 향상을 위하여 home and away 테스트가 수행되었다. 동일 시편에 대한 비교 테스트 결과 대부분의 시편에서는 STC 1 ㏈ 이내의 차이를 보였다. 다만, 특정 시편의 경우 STC 5 ㏈의 차이가 발생하였다. 주원인으로는 잔향시간 측정 오차가 주원인으로 추정되며, 또한 부수적인 원인으로는 시편의 제작 및 설치의 차이 때문인 으로 사료된다.

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국제에너지기구 태양광발전 협력사업의 공동실험 방법에 의한 건물일체형 태양광발전(BIPV) 모듈의 성능 평가 분석 (Performance Analysis of a BIPV Module Based on Round Robin Test of IEA PVPS Task 15)

  • 김진희;안종권;김준태
    • Current Photovoltaic Research
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    • 제8권2호
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    • pp.54-59
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    • 2020
  • Within the IEA (International Energy Agency) PVPS (Photovoltaic Power System) Programme Task 15, 'Enabling Framework for the Acceleration of BIPV,' a round-robin action focusing on the performance of vertical BIPV elements as a facade in different climatic environments was performed. The performance of identical (both, in construction and bill of materials (BOM)) glass-to-glass c-Si BIPV elements was monitored at seven outdoor test sites in 6 different countries in Europe and Asia. In this work, the comprehensive results of the electrical and corresponding meteorological data will be presented and discussed. The monitored data were merged, processed, and filtered for further analysis. The analysis includes the chracteristics of the module temperatures and the in-plane irradiation at the outdoor test locations, mean daily PR per test module, time series of mean daily performance ratio coefficients, and monthly yield.

로크웰 경도 국제비교교정 결과 분석 (Analysis on the Results of the World Wide Rockwell Hardness Round Robin Test with Conical Indenters)

  • 방건웅;탁내형
    • 열처리공학회지
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    • 제14권6호
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    • pp.336-344
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    • 2001
  • For the establishment of the world wide unified scales of the Rockwell hardness test with conical indenters, round robin test was carried from 1998 to 2000. The pilot laboratory was MPA-NRW and 12 laboratories from 11 countries participated In this RRT. Rockwell hardness of 74 specially prepared blocks was measured for the scales of C, A, D, 45N, 30N, and 15N and the results were compared. It was found that the geometric form of indenter affects on the results very significantly and standardization in the measurement and evaluation of indenter should be established in short time for the reliable hardness measurement. KRISS showed good results in general for all of the ranges except 15N scale which showed relatively large difference compare to the mean value. It was concluded that poor control in loading velocity of the dash pot was the major reason.

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