• 제목/요약/키워드: test adequacy

검색결과 273건 처리시간 0.025초

L-모멘트 및 LH-모멘트 기법에 의한 적정 설계홍수량의 유도( I ) - L-모멘트법을 중심으로 - (Derivation of Optimal Design Flood by L-Moments and LB-Moments ( I ) - On the method of L-Moments -)

  • 이순혁;박명근;맹승진;정연수;김동주;류경식
    • 한국농공학회지
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    • 제40권4호
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    • pp.45-57
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    • 1998
  • This study was conducted to derive optimal design floods by Generalized Extreme Value (GEV) distribution for the annual maximum series at ten watersheds along Han, Nagdong, Geum, Yeongsan and Seomjin river systems. Adequacy for the analysis of flood data used in this study was established by the tests of Independence, Homogeneity, detection of Outliers. L-coefficient of variation, L-skewness and L-kurtosis were calculated by L-moment ratio respectively. Parameters were estimated by the Methods of Moments and L-Moments. Design floods obtained by Methods of Moments and L-Moments using different methods for plotting positions in GEV distribution were compared by the Relative Mean Errors(RME) and Relative Absolute Errors(RAE). The results were analyzed and summarized as follows. 1. Adequacy for the analysis of flood data was acknowledged by the tests of Independence, Homogeneity and detection of Outliers. 2. GEV distribution used in this study was found to be more suitable one than Pearson type 3 distribution by the goodness of fit test using Kolmogorov-Smirnov test and L-Moment ratios diagram in the applied watersheds. 3. Parameters for GEV distribution were estimated using Methods of Moments and L-Moments. 4. Design floods were calculated by Methods of Moments and L-Moments in GEV distribution. 5. It was found that design floods derived by the method of L-Moments using Weibull plotting position formula in GEV distribution are much closer to those of the observed data in comparison with those obtained by method of moments using different formulas for plotting positions from the viewpoint of Relative Mean Errors and Relative Absolute Errors.

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종속성 그래프 기반 클래스 테스팅 (The class testing based on a dependence graph)

  • 임동주;배상현
    • 인터넷정보학회논문지
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    • 제1권1호
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    • pp.105-113
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    • 2000
  • 절차적 프로그램의 표현방법은 클래스, 객체, 계승, 동적 바인딩 등으로 이루어진 객체지향 프로그램 표현에 그대로 적용될 수 없다. 더군다나 기존의 프로그램 종속성은 변수간이 아니라 문장간의 종속성을 나타내고 있다. 즉, 주어진 변수에 어떠한 변수들이 영향을 미치고 있는가 하는 문제를 해결할 수 없다. 따라서 본 연구는 객체지향 프로그램에서 변수간의 종속성을 포함한 구현 수준의 정보를 나타내는 메소드 종속성 모델을 제시하고자 한다. 또한 객체지향 프로그램의 테스트 적합성 기준에 근거한 구현기반 클래스 테스팅 방법을 제안한다. 데이터 멤버간 종속성과 테스트 데이터 적합성에 대한 공리들을 고려하여 흐름 그래프 기반 테스팅 기준을 만족시키는 테스트 케이스인 메소드의 시퀀스를 생성시킨다. 파생 클래스 테스팅을 위해서 유산관계와 실험을 통해 테스트 비용 절감을 검증한 부모 클래스에 대한 테스팅 정보의 재사용성을 고려한다.

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해운선사 안전관리 평가지표 개발에 관한 연구(2) : 안전경영 지표 평가항목 개발 (A Study on the Development of Evaluation Index for Safety Management Level of Shipping Company(2) : Development of Evaluation Items for Safety Management Index)

  • 김주환;김화영
    • 해양환경안전학회지
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    • 제21권6호
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    • pp.696-703
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    • 2015
  • 본 연구는 '해운선사 안전관리 평가지표 개발에 관한 연구'의 후속연구로서 선행연구에서 도출한 '안전관리 평가지표'의 '안전가점' 지수에 해당하는 안전경영 지표의 평가항목을 개발하고, 적정성을 평가하는데 목적이 있다. 이를 위해 해상화물운송사업장에서 일하는 안전관리 담당자를 대상으로 의견을 수렴하여 안전경영 지표별 11개의 평가항목을 개발하였다. 식별된 11개 평가항목에 대한 적정성 검토를 위해 설문조사를 실시하고, 사업형태별(내항해상화물운송, 외항해상화물운송), 사업규모별(보유선박수)로 응답자의 적정성 인식의 차이를 통계적 기법을 활용하여 분석하였다. 그 결과, 평가항목에 대한 적정성 인식의 차이는 사업형태와는 무관하였다. 그러나 사업규모에 따라서는 소(小) 중(中) 대(大) 3개의 그룹 간 평가항목의 적정성에 인식의 차이가 존재했다. 따라서 향후 안전경영 지표를 활용하여 선사를 평가할 경우, 사업형태별로 동일하게 평가하되 사업규모별로는 보유선박수에 따라 그룹화하여 평가하는 것이 타당하다는 결론을 얻었다.

마팅게일잔차에 기초한 가산위험모형의 적합도검정법 (A goodness-of-fit test based on Martinale residuals for the additive risk model)

  • 김진흠;이승연
    • 응용통계연구
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    • 제9권1호
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    • pp.75-89
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    • 1996
  • 본 논문에서는 하나의 이진공변량(binary covariate)을 갖는 가산위험모형(additive risk model)의 적합도를 검정하기 위한 검정법을 제안하였다. 제안된 검정법은 마팅게일잔차(martingale residual)에 기초한 Wei(1984)의 비례위험모형(proportional hazards model)의 적합도검정법을 가산위험모형으로 확장한 형태이다. 제안된 검정통계량의 점근성질을 유도하였고 실제자료에 적용하여 보았다.

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Comparison of Liquid-based Cytology and Conventional Smear in the Evaluation of Sputum Cytology

  • Back, Oun-Cheol
    • 대한임상검사과학회지
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    • 제45권1호
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    • pp.26-31
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    • 2013
  • The cytology of sputum specimens, at a medical facility in Korea, is using the liquid-based cytology and conventional smear method. It confirms the diagnosis using conventional smear methods and the liquid-based cytology. In addition, the diagnosis uses two kinds of each method, compares the suitability, sensitivity and specificity for each test and tries to understand the efficient method needed. It divided sputum specimens in half and liquid-based cytology. A conventional smear method was conducted and the Papanicolaou's staining was conducted using Autostainer. Diagnosed each slide of staining produced smear slides specimens by using an optical microscope. The result of the liquid-based cytology and conventional smear method was that the liquid-based cytology was of a higher-grade than the conventional smear method. It was 36.8%, and 62.8% in the same condition. But only one case was of a lower grade. Liquid-based cytology showed 86.2% of adequacy, 31.0% of sensitivity and 97.5% of specificity. The conventional smear method showed 54.4% of adequacy, 19.6% of sensitivity and 100% of specificity. If it was conducted with two methods at the same time, the results would be similar to the liquid-based cytology. In conclusion, liquid-based cytology has a more superior adequacy and sensitivity than the conventional smear method. The combination of the two methods is similar to the result of only conducting a liquid-based cytology. Conducting a liquid-based cytology rather than the combination of the two ways of sputum cytoscopy, is to be considered as an efficient method to achieve diagnostic accuracy, reduce labor of clinical technologist and pathologist, and to reduce the expense of patients.

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교류 정지시험법을 이용한 동기형 릴럭턴스 전동기의 직접토크제어 특성 연구 (Direct Torque Control of Synchronous Reluctance Motor Using the AC standstill Test)

  • 윤준보;김솔;임진재;이문주;이주
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2003년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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    • pp.56-58
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    • 2003
  • The Synchronous inductance in Synchronous Reluctance Motor is an element that is proportional to torque. the exact value must be found for controlling and the performance development of motors. In this paper, the inductances that are obtained by the Finite Element Method and AC standstill Test are compared each other. When controlling the direct torque. the fast response characteristics has been carried out with the inductace by the AC stanstill Test. To test the proposal controller, A Synchronous Reluctance Motor has been designed and manufactured and the adequacy of the proposal control are confirmed thought simulations and experiments.

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KS F 2622에서 복합계열에 대한 성능 추가시 풍압 저항성 시험 평가방법의 적정성 검토 (A Study on the Appropriateness of Wind Pressure Resistance Test in KS F 2622)

  • 강효진;김수연;오상근
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2018년도 추계 학술논문 발표대회
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    • pp.187-188
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    • 2018
  • In this study, wind pressure resistance test was carried out among the nine test items of KS F 2622 using five types of water-tight material. After comparing the results with the performance range of the current KS F 2622 wind pressure resistance test, it is recommended to check the adequacy of the addition of the combined series.

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유통업 여성 근로자의 건강 문제와 건강 행위에 관한 연구 (A Study on Health Behaviors and Problems of Female Retail Workers)

  • 김숙영;윤순녕
    • 지역사회간호학회지
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    • 제11권1호
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    • pp.127-145
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    • 2000
  • The objectives of this study are to identify health behaviors and health problems. and the relations between health behaviors and health problems of female workers in the retail business. The number of subjects were 200 female workers of 6 department stores in Seoul and Kyonggi area, whose jobs last more than 6 months as retail employees. The data was collected during 2 months from July 1 to August 30, 1998. The Cornell Medical Index Health Questionnaire(CMI) was used to measure their health problems, while health behaViorn were investigated in terms of 'smoking', 'alcohol', exercise', 'diet', and 'sleeping'. The data were analyzed with frequency. percentage, t-test, ANOVA test, and $X^2-test$ by SPSS PC+ program. The results of this study are as follows: 1. Out of health problems. Digestive symptoms occupied the highest percent number. nervous ones the second and cardiovascular ones the third among physical health problems of retail female workers. The most frequent mental health problem was 'adequacy' and the next, 'tension' and 'anger', 2, Health problems according to general characteristics of subjects were shown that the younger or the unmarried complained more than the older or the married, especially in the items of 'eye and ear', 'respiratory system', 'cardiovascular system', 'digestive tract', 'nervous system', 'adequacy', and 'depression'. The longer working duration they have had, the more they complained of 'respiratory system' and 'adequacy'. The lower academic careers complained of 'nervous' than the higher ones with statistical significance. 3. The analysis of daily health clinic notes showed that respiratory complaints were the highest percent, successively followed by digestive tract, nervous one, external injury, musculoskeletal system, urinary-reproductive system and others. 4. The level of their health practice was generally low in smoking, diet habit and alcohol intake, exercise, sleeping, very low especially in smoking, diet, alcohol intake, and exercise among them all. 5. Present smokers and ones with past experience complained of physical and mental health problems of 'respiratory system', 'digestive tract', 'skin', 'nervous', 'urinary-reproductive system', 'fatigability', adequacy', 'depression', 'anxiety', 'anger' and 'tension', than non smokers, with statistical difference. Workers without having breakfast and with irregular diet had more complaints on 'digestive tract', 'adequacy' and 'tension', than those who had regular dietary habit. The less the subjects slept, the more they complained of eye and ear, cardiovascular system. The subjects who drank alcohol complained more digestive problem. However, whether they exercise or not did not affect physical and mental health problems in a significant manner. 6. The subjects' age and marital status were statistically significant relating to health behaviors, as the younger or unmarried recorded a low level of health practice in smoking, drinking, dietary habit. Based on the results, the suggestions are made as follows: 1. Health education program on smoking, alcohol intake, diet habit is needed to improve health problems and health behavior of female retail workers. 2. The unmarried workers of late teen and twenties, who are transitional period from teenagers to adulthood are important targets for health promotion program especially for maternal health. 3. Better working environment with sufficient time and facilities for workers to relax is required to promote female sales workers' health. 4. Further research is required to identify the relation between workers' visual fatigue and intense lights for the display of goods.

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Comparison of Parameter Estimation Methods in the Analysis of Multivariate Categorical Data with Logit Models

  • Song, Hae-Hiang
    • Journal of the Korean Statistical Society
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    • 제12권1호
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    • pp.24-35
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    • 1983
  • In fitting models to data, selection of the most desirable estimation method and determination of the adequacy of fitted model are the central issues. This paper compares the maximum likelihood estimators and the minimum logit chi-square estimators, both being best asymptotically normal, when logit models are fitted to infant mortality data. Chi-square goodness-of-fit test and likelihood ratio one are also compared. The analysis infant mortality data shows that the outlying observations do not necessarily result in the same impact on goodness-of-fit measures.

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Capital Buffer and Determinant Factors of Conventional Banks in Indonesia

  • ANISA, Anisa;SUTRISNO, Sutrisno
    • The Journal of Asian Finance, Economics and Business
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    • 제7권12호
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    • pp.377-384
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    • 2020
  • Banking is very regulated by the government and even has to follow regulations issued by the Basel Committee on Banking Supervision, which regulates banking in the world. According to Basel III, banks must provide capital reserves called capital buffers. The purpose of this study is to examine the factors that determine capital buffer. Factors thought to affect the capital buffer studied consisted of profitability (ROA), credit risk (NPL), liquidity risk (LDR), capital adequacy in the previous period (CARt-1), management risk (NIM), and ratio of operating risk (OER). The population in this study is conventional banks listed on the Indonesia Stock Exchange, as many as 42 banks, with a sample of 40 banks taken by purposive sampling method with an observation period of four years with quarterly data (2016-2019). To test the hypotheses, regression panel data is used. After being tested, it turns out that the fixed effect model is better than the common effect and random effect. The results of the study with fixed effect models show that ROA, NPL, and OER significantly and negatively affect capital buffer. CARt-1 has a positive and significant effect on capital buffer, while LDR and NIM do not affect capital buffer.