• 제목/요약/키워드: Test And Evaluation

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시뮬레이션과 모형시험을 통한 핀 안정기의 성능평가 (Performance Evaluation of Fin-Stabilizer by Model Test and Time-domain Simulation)

  • 홍사영;김현조;최윤락;신영균;유병석;이승준
    • 한국해양공학회:학술대회논문집
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    • 한국해양공학회 2001년도 추계학술대회 논문집
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    • pp.86-90
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    • 2001
  • Demand of good seakeeping perfomace is increasing for sea going vessels such as cruisers, naval ships and container ships. Especillay roll motion is one of major concerns in evaluation of seakeeping performance due to its large resonace motion. Since large roll resonance motion is mainly arised from inherent small damping. use of additional mechnism to provide roll damping can significantly reduce roll motion. In this paper, a reliable performace evaluation method of fin stabilizer, which is very useful for stabilizing roll motion of mid and high speed vessls, is described. Model test and time domain simulation methods are adopted for performance evaluation in which real operating situation of fin stabilizer can be exactly modelled. Model test and simulation results show good correlations between model test and simulation results.

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STUDIES ON THE IN VITRO SPF TEST METHOD OF SUNSCREEN PRODUCTS

  • K. H. Son;Kim, Y. O.;Lee, J. P.;S. J. Yang;Kim, W. H.;Kim, C. K.;M. Y. Heo;S. J. Jang;Park, S. S.
    • 대한화장품학회:학술대회논문집
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    • 대한화장품학회 2003년도 IFSCC Conference Proceeding Book II
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    • pp.528-528
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    • 2003
  • The present study was undertaken to develop the in vitro sun protection factor(SPF) test method having good correlation with in vivo method using human. 8% homomentyl salicylate, P3 reference standard and commercially available sunscreen products were measured by the in vitro method using SPF 290S analyzer, and the SPFs were compared with the SPFs measured by in vivo test method. In vitro SPFs of 8% HMS and P3 reference standard were 4.59 $\pm$ 0.12 and 14.94 $\pm$ 0.83. There are good correspondence, correlation coefficients were 0.9506 and 0.9769 respectively, between the in vitro and in vivo SPFs for the sunscreen creams and lotions. Correlation coefficients of makeup base/liquid foundation, lotion labled with "shake before use" and compact powder were 0.8812, 0.8632 and 0.5984 respectively. The optimum mixture ratio of compact powder and cream base represents 1:0.8. These results suggest that the in vitro SPF test method will be able to be used as an alternative method for in vivo SPF in case of lotion and cream.

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5축 공작기계 정밀도 평가를 위한 표준 공작물에 관한 연구 (A Study on the Test Workpiece for Accuracy Evaluation of 5-Axis Machine Tool)

  • 윤재웅;김기환;박종탁
    • 한국정밀공학회지
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    • 제31권5호
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    • pp.431-439
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    • 2014
  • Recently, a demand for precision 5-axis machine tools is significantly increasing, and the maintenance of machine tool accuracy becomes more important. it is very difficult to evaluate to accuracy of 5-axis M/C in the production site since it needs expensive measuring equipment and skilled engineer. On the other hand, evaluation items of 5-axis M/C are not systematically organized in the existing KS and ISO standards. In this study, the evaluation items for 5-axis M/C were derived systematically and a test workpiece was developed to evaluate the machine tool accuracy more easily. The error sources of machine tool can be estimated by machining and measuring of the test workpiece. The correlation between the machine tool accuracy and the accuracy of machined test workpiece was analyzed. As a result, the accuracy of machined test workpiece represented the accuracy of machine tool and the error sources very effectively.

수학과 평가 문항제작의 실제 (A Study on the Practice of Making up Questions on Schools Mathematics Tests)

  • 전영주
    • 한국학교수학회논문집
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    • 제15권2호
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    • pp.281-297
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    • 2012
  • 수학과 평가는 학생들의 수학적 사고력과 성취도를 측정하는데 있다. 또한 이를 분석 활용하여 수학교육의 질을 높이는데 그 목적이 있다. 이러한 평가는 좋은 문항제작에서부터 시작된다. 이에 본고는 문항제작 관련 이론을 고찰하고, 교육목표에 따른 예시 문항과 문항제작시의 유의점을 살펴보며, 계획 단계, 초안 문항제작 단계, 검토 단계, 최종 문항제작 단계 등 단계별 문항제작의 실제를 안내하고자 한다.

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An Empirical Evaluation of Test Data Generation Techniques

  • Han, Seung-Hee;Kwon, Yong-Rae
    • Journal of Computing Science and Engineering
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    • 제2권3호
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    • pp.274-300
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    • 2008
  • Software testing cost can be reduced if the process of testing is automated. However, the test data generation task is still performed mostly by hand although numerous theoretical works have been proposed to automate the process of generating test data and even commercial test data generators appeared on the market. Despite prolific research reports, few attempts have been made to evaluate and characterize those techniques. Therefore, a lot of works have been proposed to automate the process of generating test data. However, there is no overall evaluation and comparison of these techniques. Evaluation and comparison of existing techniques are useful for choosing appropriate approaches for particular applications, and also provide insights into the strengths and weaknesses of current methods. This paper conducts experiments on four representative test data generation techniques and discusses the experimental results. The results of the experiments show that the genetic algorithm (GA)-based test data generation performs the best. However, there are still some weaknesses in the GA-based method. Therefore, we modify the standard GA-based method to cope with these weaknesses. The experiments are carried out to compare the standard GA-based method and two modified versions of the GA-based method.

함정사업 시험평가의 효율적 수행방안에 관한 연구 (A Study on Efficient Test & Evaluation Methods in Naval Ship Acquisitions)

  • 김재용;최원석;홍석윤;정현균;송지훈;임우석;권현웅
    • 한국군사과학기술학회지
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    • 제19권6호
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    • pp.703-711
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    • 2016
  • The purposes of this study is to identify the problems arising from current Test & Evaluation process of the naval ship acquisition program and to suggest methods to increase the acquisition efficiency. Considering that the present rule of developmental test &evaluation(DT&E) and operational test & evaluation(OT&E) has caused an inefficiency effect on the acquisition procedures due to the limited practices on it, the DT&E and OT&E procedures through test & evaluation master plan(TEMP) is proposed based on the selective practices of the defense instruction articles. Also, considering characteristics of naval ship acquisitions, efficient procedure systems are derived through case analysis results by comparing each performances of the system. The suggested methods are able to meet the requirements of the changed acquisition environments and also increase efficiency of acquisition systems by adoption of DT&E and OT&E combined test scheme.

착상을 수반한 핀-관 열교환기의 성능평가계수에 관한 연구 (The Study of Performance Evaluation Coefficient of Fin-and-Tube Heat Exchangers with Frosting)

  • 최봉준;황준현;신종민
    • 설비공학논문집
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    • 제15권2호
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    • pp.132-136
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    • 2003
  • For the study of performance evaluation on different shape heat exchangers that have the same energy consumption in a refrigerator, we make performance evaluation coefficient (PEC) which can distinguish performance of different shape heat exchangers. The results were reported in order to compare with for the dry frosting and wet frosting test as various definition of PECs. Results showed that PEC of dry frosting test is higher than that of wet frosting test because attached water droplet increases pressure drop of air-side then this decreases performance of heat exchanger.

슬랙스 형태 적합성 평가의 정량적 평가 기준 설정 (Establishing Quantitative Evaluation Standards for the Shape Fitness test of Slacks)

  • 김선영
    • 한국의류산업학회지
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    • 제18권5호
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    • pp.695-707
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    • 2016
  • This study presents quantitative evaluation standards for the shape fitness test, conducted in the process of the slacks fit test. This study aims to quantify appearance sensory test of slacks for the objectification of qualitative evaluation methods in existing shape fitness tests. The subjects were women of standard body type between the ages of 18 and 24. Slacks differing in their ease in waist girth, hip girth, crotch length and knee length were designed to test their shape fitness. The gap volume distribution between the body and slack, angle of the baseline by body part, and ratio of total thickness from the sideline using 3D human body scan data (which reflect the results of the appearance sensory test) were presented as quantitative evaluation standards. There were less wrinkles in the wrinkle/overstretch and ease categories of the appearance sensory test; in addition, ease was adequate and small enough to comfortably perform basic human activities in the standing upright posture. The gap volume distribution analysis between body and slacks showed that curves increased in the slacks surface along with an increase of ease in slacks and suggested that wrinkles also increased. In the baseline's horizontal categories in terms of a $0^{\circ}$ horizontal angle, the range of angles were evaluated as adequate by the clothing expert group. The total thickness ratio of 0.5:0.5 divides into the sideline from the baseline.

한국어판 Balance Evaluation Systems Test의 번역 적합성 연구 (A Study of Translation Conformity on Korean Version of a Balance Evaluation Systems Test)

  • 전용진;김경모
    • 한국전문물리치료학회지
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    • 제25권1호
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    • pp.53-61
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    • 2018
  • Background: The process of language translation, adaptation, and cross-cultural validation of tools for use in multiple countries requires the adoption of well-established, comprehensive, and rigorous methodological approaches. Back translation, which is the most recommended method, permits the detection of errors in the translation and the identification of words or phrases that cannot be accurately or literally translated. Objects: The aim of this study was to verify the content validity of a Korean version of a Balance Evaluation Systems test (BESTest) by using a back-translation method. Methods: This research was conducted in six steps: 1) translation of the BESTest into Korean, 2) evaluation of the translation conformity of Korean-translated BESTest, 3) evaluation of the degree of translation comprehension, 4) back translation of Korean BESTest, 5) evaluation of the technical and conceptual equivalence, and 6) completion of the Korean version of BESTest by the translation verification committee. Results: In this study, Korean version of the BESTest achieved a rating of more than 3 (moderate) for translation comprehension, and technical equivalence and conceptual equivalence of back translation were evaluated as 3 (moderate) or more. Conclusion: The Korean version of the BESTest has proven content validity and is an appropriate tool to measure balance function.

생약의 확인시험법에 대한 유해용매 대체시험법 설정 (Clean Analysis Not to Use Harmful Solvent for TLC Identification Test of the Herbal Medicine)

  • 김지연;박주영;심영훈;조창희;이종화;이동진;김보준;김동섭;성락선;김종환;임숙;신진선;장승엽
    • 생약학회지
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    • 제41권2호
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    • pp.136-140
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    • 2010
  • This study was carried out to utilize non-toxic solvents instead of harmful solvents for the TLC(Thin Layer Chromatography) identification test of herbal medicines. It is recommended not to use harmful solvent such as chloroform at a viewpoint of clean analysis. In this study, we revised the identification test of 10 items in the Korea Pharmacopoeia(KP) and the Korean Herbal Pharmacopoeia(KHP) such as Cornus officinalis S. containing the harmful solvents on the developing solvent and established identification test that is utilized non-toxic solvents by HPTLC(High Performance Thin Layer Chromatography).