• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제53권9호
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• pp.470-474
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• 2004

Both ratio error and phase angle error in voltage transformer(VT) depend on values of burden of VT used. A method of evaluation for linearity of ratio error and phase angle error in VT measurement equipment have been developed using the standard resistance burdens, with negligible AC-DC resistance difference less than $10^-6$. These burden consists of five standard resistors, with nominal resistance of 100 $\Omega$, 1 k$\Omega$, 10 k$\Omega$, 100 k$\Omega$, and 1 M$\Omega$. The developed method has been applied in VT measurement equipment of industry and the validity of the developed method has been verified by showing the consistency of the result of linearity obtained using VT with wide ratio error.

• 콘크리트학회논문집
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• 제28권3호
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• pp.267-278
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• 2016

이 논문에서는 저자가 제안한 전단경간비가 3 이하인 철근콘크리트 보의 부정정 스트럿-타이 모델 및 하중분배율을 이용하여 파괴실험이 수행된 335개 철근콘크리트 보의 극한강도를 평가하였다. 또한 이들 보의 극한강도를 실험 전단강도모델에 기초한 설계기준, 이론 전단강도모델에 기초한 설계기준, 그리고 현행 스트럿-타이 모델 설계기준 등으로 평가하였다. 각 설계기준 및 이 연구의 방법에 의한 극한강도 평가결과를 비교분석하여 저자가 제안한 부정정 스트럿-타이 모델 및 하중분배율의 타당성을 검증하였다.

• 대한간호학회지
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• 제35권1호
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• pp.47-55
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• 2005

Purpose: This study was to evaluate the validity of the Pediatric Index of Mortality Ⅱ(PIM Ⅱ). Method: The first values on PIM Ⅱ variables following ICU admission were collected from the patient's charts of 548 admissions retrospectively in three ICUs(medical, surgical, and neurosurgical) at P University Hospital and a cardiac ICU at D University Hospital in Busan from January 1, 2002 to December 31, 2003. Data was analyzed with the SPSSWIN 10.0 program for the descriptive statistics, correlation coefficient, standardized mortality ratio(SMR), validity index(sensitivity, specificity, positive predictive value, negative predictive value), and AUC of ROC curve. Result: The mortality rate was 10.9% (60 cases) and the predicted death rate was 9.5%. The correlation coefficient(r) between observed and expected death rates was .929(p<.01) and SMR was 1.15. Se, Sp, pPv, nPv, and the correct classification rate were .80, .96, .70, .98, and 94.0% respectively. In addition, areas under the curve (AUC) of the receiver operating characteristic(ROC) was 0.954 (95% CI=0.919～0.989). According to demographic characteristics, mortality was underestimated in the medical group and overestimated in the surgical group. In addition, the AUCs of ROC curve were generally high in all subgroups. Conclusion: The PIM Ⅱ showed a good, so it can be utilized for the subject hospital. better.

• Pediatric Gastroenterology, Hepatology & Nutrition
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• 제22권6호
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• pp.554-564
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• 2019

Purpose: This study verified the reliability and validity of the Diet Quality Index for Indian children (DQIIC). Methods: The study sample included 100 school going boys and girls (7-9 years). The dietary behavior of children was studied using a questionnaire and 24-hour dietary recall. The DQIIC comprises 21 items which aimed to assess the diet of Indian children on the basis of variety, adequacy of consumption of dietary components, and moderation in the amount of nutrients that are associated with diseases and dietary habits. The reliability of the DQIIC was assessed using the split half method, Cronbach's alpha, and test retest reliability. Content validity was evaluated using content validity ratio (CVR). Results: The intake of iron was found to be less than the recommended dietary allowances. There was frequent consumption of empty calorie packaged foods and higher than the recommended amount of sodium. Reliability of the DQIIC was 0.85 by split half method and the correlation coefficient for test retest reliability was 0.87. Cronbach's alpha was 0.62 and CVR was 0.85 for this index. Most of the children fell in the moderately healthy category. Conclusion: The DQIIC is a reliable and valid tool to assess the diet quality of Indian children between 7-9 years.

• Design & Manufacturing
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• 제2권5호
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• pp.21-24
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• 2008

On this study, injection molding product of rectangular tray structure with thickness 0.25mm and aspect ratio(length/thickness) approximately 150 conducted. Technical aspects were reviewed on mold-die design and injection molding conditions. To have a thin-membraned plastic part, short-shot, shrinkage, twist, whitening and flash problems were considered and resolved. After measuring products, validity of this study and future improvement were discussed.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2005년도 추계 학술발표회 제17권2호
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• pp.109-112
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• 2005

In this paper described is the basic concept of the Guideline for Post-earthquake Damage Assessment of RC buildings, revised in 2001, in Japan. This paper discusses the damage rating procedures based on the residual seismic capacity index R, the ratio of residual seismic capacity to the original capacity, that is consistent with the Japanese Standard for Seismic Evaluation of Existing RC Buildings, and their validity through calibration with observed damage due to the 1995 Hyogoken-Nambu (Kobe) earthquake. Good agreement between the residual seismic capacity ratio and damage levels was observed.

• 한국지역지리학회지
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• 제23권1호
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• pp.195-212
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• 2017

본 연구는 2014학년도부터 2016학년도 고등학교 한국지리 대학수학능력시험 평가 문항의 교육과정 성취기준에 대한 내용타당도를 분석하였으며, 주요 연구결과는 다음과 같다. 먼저, '지식 차원'에서 성취기준과 수능 평가 문항은 모두 '사실적 지식'의 비율이 가장 높게 나타났다. 둘째, '인지과정 차원'에서 성취기준은 '이해하다'의 비율이 가장 높게 나타났으나, 수능 평가 문항에서는 '분석하다'와 '분석하다'가 '이해하다'와 복합된 유형의 비율이 가장 높게 나타났다. 셋째, 비율차 검증을 통한 한국지리 수능 문항의 내용타당도 분석 결과, 분석대상 학년도 모두 내용타당도가 '조금 낮다'로 나타났다. 마지막으로 교육과정 내용 영역별 내용타당도 분석 결과, '지형 환경과 생태계', '생산과 소비의 공간' 영역은 '인지과정 차원'에서 성취기준과 수능 평가 문항의 주요 유형의 차이가 크게 나타나 다른 영역에 비해 내용타당도가 상대적으로 낮게 나타났다. 이상의 연구 결과는 한국지리 대학수학능력시험 문항 출제 시 교육과정 성취기준을 충실히 반영한 평가가 이루어져야 하며, 학습자의 자료 분석 능력 평가에 치중되어서는 안 된다는 점을 시사한다.

• Computers and Concrete
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• 제11권4호
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• pp.291-304
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• 2013

By considering the creep characteristics of concrete core under eccentric compression, a creep model of concrete filled steel tubes (CFT) columns under eccentric compressive loads is proposed based on the concrete creep model B3. In this proposed model, a discrete element method is introduced to transform the eccentric loading into axial loading. The validity of the model is verified by comparing the predicting results with the published creep experiments results on CFT specimens under compressive loading, together with the predicting values based on other concrete creep models, such as ACI209, CEB90, GL2000 and elastic continuation and plastic flow theory. By using the proposed model, a parameters study is carried out to analysis the effects of practical design parameters, such as concrete mix (e.g. water to cement ratio, aggregate to cement ratio), steel ratio and eccentricity ratio, on the creep of CFT columns under eccentric compressive loading.

• Asian Pacific Journal of Cancer Prevention
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• 제17권9호
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• pp.4341-4347
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• 2016

Background: Patient safety is one of the key components of nursing care for cancer cases. Valid and reliable context-based instruments are necessary for accurate evaluation of patient safety in oncology units. The aim of the present study was to develop and evaluate the psychometric properties of the Patient Safety Violation Scale in medical oncology units in Iran. Materials and Methods: In this methodological study, a pool of 58 items was generated through reviewing the existing literature. The validity of the 58-item scale was assessed through calculating impact score, content validity ratio, and content validity index for its items as well as conducting exploratory factor analysis. The reliability of the scale was evaluated by assessing its internal consistency and testretest stability. Study sample consisted of 300 oncology nurses who were recruited from thirteen teaching hospitals affiliated to Tehran University of Medical Sciences, Tehran, Iran. Results: Sixteen items were excluded from the scale due to having low impact scores, content validity ratios, or content validity indices. In exploratory factor analysis, the remaining 42 items were loaded on five factors including patient fall, verification of patientidentity, harm during care delivery, delay in care delivery, and medication errors. These five factors explained 62% of the total variance. The Cronbach's alpha of the scale and the test-retest interclass correlation coefficient were equal to 0.933 and 0.92, respectively. Conclusions: The 42-item Patient Safety Violation Scale is a simple and short scale which has acceptable validity and reliability. Consequently, it can be used for assessing patient safety in clinical settings such as medical oncology units and for research projects.

• 한국군사과학기술학회지
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• 제20권5호
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• pp.597-607
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• 2017

The general control method for Anti-lock Brake System(ABS) is that the wheel slip ratio is observed and the braking force is controlled in real time in order to keep the wheel slip ratio under the value of the best slip ratio. When a wheel runs on the state of the best slip ratio, the ground friction of the wheel approaches the highest value. The value of best slip ratio, theoretically, is known as the value between 10 and 20 % and it is dependant on the ground condition such as dry, wet and ice. It is an important parameter for the braking performance and affects the braking stability and efficiency. In this thesis, an experimental method is suggested, which is a reliable way to decide the best slip ratio through dynamo tests simulating aircraft taxiing conditions. The obtained best slip ratio is proved its validity by results of aircraft taxiing tests.