• Title/Summary/Keyword: performance of the test.

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Design and Fabrication of Test Equipment for mass production of Automatic Test Equipment(ATE)

  • Kim, Dong-Il;Choi, Kyung-Jin
    • Journal of the Korea Society of Computer and Information
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    • v.22 no.8
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    • pp.1-7
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    • 2017
  • In this paper, we proposed the test equipment that can perform separate performance tests to mass-produce the Automatic Test Equipment. Until now, the performance test of the ATE has been performed after it has been assembled perfectly. It is possible to perform the performance test only when the external device manufacturing and setting of measurement resources and the internal wiring work have been completed. So we have been studying test equipment that separately tested the switching devices that played a key role in the performance of the ATE. To build the test equipment, we reviewed the circuit card assemblies that make up the switching devices. We designed a test equipment that satisfies the performance test and apply the completed test equipment to the actual production process to analyze whether it was effective in improving the time and workability of the performance test. The test equipment has the advantage that it can be used universally in the mass production process of ATE with the same type of switching device.

A Comparative Performance Test for Turbine in Wind Tunnel and Towing Tank (풍동과 예인 수조를 이용한 터빈 성능 비교 시험)

  • Kang, Jung-Min;Lee, Yeong-Ho;Lee, Kyu-Chan
    • New & Renewable Energy
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    • v.7 no.4
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    • pp.42-49
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    • 2011
  • The objective of this paper is to suggest a new method of a wind turbine performance test. The performance test of a wind turbine is generally carried out in a wind tunnel. The test needs not only a high-accuracy measuring system but also durable structure to withstand high speed turbine rotation and wind flow. Therefore, we tried turbine performance test using a towing tank to improve stability and reliability. Because a turbine rotates more slowly and generates more torque in the water than in the wind tunnel under similarity conditions. In this study, we developed turbine performance test systems and verified the turbine test method using a towing tank through comparing results of the wind tunnel and the towing tank test.

Problem Analysis and Study of Solution Device in Relation with Middle School Mathematics Performance Assessment (중학교 수학과 수행평가의 문제점 분석 및 그 해결 방안 연구)

  • 박재용
    • Journal of the Korean School Mathematics Society
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    • v.3 no.1
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    • pp.149-163
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    • 2000
  • The Ministry of Education have had us practice the performance test as a substitute proposal, however, all the more for the idealistic purport, our education front does not have such a sufficient condition as to practice the performance test for many classes and miscellaneous duties and over-populated class, and that practice has been enforced so abruptly without any drastic preparation and has caused much confusion from the beginning of that enforcement. Thus, these problematic concerns are remained as the tasks of the teachers to be solved by themselves in the front of education, and herein I came to do this research. The followings are the conclusions that I got as the results of the research (1) Performance test style should be applied in consideration of the students' achievement level and the gap of the teachers' recognition; descriptive test, portfolio assignment and formative test styles were proper for the students lacking basic study ability. (2) Descriptive test should have its beginning with the question items to which students can write the problem solving procedure logically rather than those to evaluate the creation ability and thinking ability: and putting down specifically the assessment standard could prevent students' confusion and scheme the impartiality of the assessment. (3) Portfolio assignment evaluation should be given with as interesting and suitable amounts as possible so that the students can do by themselves. (4) Utilizing the performance test table enabled easy management of documentary evidence. And it is needless to say that the success of the performance test should have preceding conditions like the teachers' understanding and their positive participation. Therefore, I'd like to give suggestions herein like the followings; (1) The performance test should not always be made into grades, and there is a need to develop the test gradually in the condition that the education surroundings permit by checking time, frequency, ratio and contents of the test while practicing the multiple choice writing test. (2) As long as the performance test has the aims of improving the studying and learning activities, any performance test only for the sake of making numerals with the thought that assessment is the disposal of the grades should be avoided, and the change of the lecturing styles and development of various assessing types and studying materials should be endeavored to confirm with the aims.

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Static load test of the bogie and vibration performance test, dynamic characteristics analysis of the bulk cement car (벌크시멘트화차의 대차 하중시험과 진동성능시험 및 동특성 해석 연구)

  • 홍재성;함영삼;백영남
    • Journal of the Korean Society for Railway
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    • v.6 no.3
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    • pp.186-193
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    • 2003
  • The object of this study is to ensure the stability of bulk cement cars conducting vibration performance test, dynamic characteristic analysis and static load test of bogie frame. In case of static load test, bogie static load test facility was used. In case of dynamic characteristic analysis, Vampire Software was used. In case of vibration performance test, real bulk cement cars were used in kyeung-bu line. In the results of static load test of bogie frame for bulk cement car, all structures satisfied allowable stress criteria of materials. The vibration performance test and dynamic characteristic analysis results satisfied allowable standards.

Changes in Insulation Performance of Organic Insulating Materials for Building Construction by Accelerated Durability Test Conditions (가속내구성 조건에 따른 건축용 유기계 단열재의 단열성능 변화)

  • Lim, Soon-Hyun;Lee, Gun-Cheol
    • Journal of the Korea Institute of Building Construction
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    • v.16 no.6
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    • pp.595-601
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    • 2016
  • The insulation performance of the insulation currently used in building structures is reflected only during design based on initial performance and the reduction in heat insulation performance due to the degradation of long-term durability is not reflected. This study reviewed the degradation of heat insulation performance due to the durability degradation of insulating materials through the accelerated durability test. The study findings showed that the foamed polystyrene insulation bead method did not show performance degradation due to aging in the standard environmental condition and laboratory accelerated test condition but the performance is degraded in the freeze-thaw test condition. On the other hand, in the case of the extrusion method, the degradation of the heat insulation performance was less in the freeze-thaw test condition, but the rapid performance degradation was caused by the release of the internal gas at the beginning of aging. In addition, the hard polyurethane foam insulation showed better initial insulation performance than other insulation materials, but the performance was found to be degraded somewhat under laboratory accelerated test conditions and freeze-thaw test conditions.

A Study on Overall Measurement System Development of HEMU-400X Performance Test (차세대고속열차 성능시험을 위한 종합계측시스템 개발 연구)

  • Lee, Young-Yeob;Ryu, Sang-Hyun;Kim, Bong-Rae;Kim, Kyung-Taek
    • Proceedings of the KSR Conference
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    • 2011.05a
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    • pp.1118-1123
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    • 2011
  • The introduction of high speed railway(KTX) in Korea after the Korean high speed train through the KTX-II of the development is being run is made. Thus the demand for the railway technology advances and high performance, Korean government promoted the development of the next-generation high speed train system(HEMU-400X). In addition to the production of train system essential element of the train through an on-line test is to evaluate the performance. Through the on-line test of the train in order to evaluate the performance test items should be selected first and need to the test procedures are required. In addition, an Overall Measuring System(OMS) to measure the performance of the train system should be established. In this study for the on-line test of the HEMU-400X test items was selected for detailed measurements and performance evaluation of a comprehensive and efficient trains to test an OMS for the development are discussed.

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The Performance Improvement of Lightning Arrester Leakage Current Measuring Device for GIS (GIS용 피뢰기 누설전류 측정장치 성능개선)

  • Kim, Won-Gyu;Kim, Min-Soo;Baek, Young-Sik
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.63 no.12
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    • pp.1726-1731
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    • 2014
  • This paper shows the developed new lightning arrester LCM (Leakage Current Measuring device) which is important element of GIS (Gas Insulated Switchgear) Preventive & Diagnostic system and verify its performance though strengthened test standards. The existing lightning arrester LCM was modified to solve measuring errors which happened frequently. At first, we explained the principle of measuring leakage current. Through analyzing some problems which the existing LCM have. we got some improvable items. For the performance verification of the improved LCM, we manufactured prototype LCM which is applied some improvable items such as improving LCM circuit, adding protection circuit, optimizing inner structure of LCM and changing ground design. After then we carried out the performance test. Accredited testing laboratory carried out the performance verification test according to performance test criteria and procedure of reliability test standards, IEC-60225, 61000 and 60068 etc. We confirmed the test results which correspond with the performance test criteria. Also, we confirmed the performance of the improved LCM installed & being operated at G Substation through the immunity test against the normal noise and open/close surge etc.

Design of Reliability Qualification Test Based on Performance Distribution at the Earlier Stage (초기 단계의 성능분포를 활용한 신뢰성 인증시험의 설계)

  • Jeong, Hai-Sung
    • Journal of Applied Reliability
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    • v.12 no.3
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    • pp.131-138
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    • 2012
  • A design of reliability qualification test based on performance distribution is developed. In general, the performance of an item degrades as the time goes by and the failure of an item occurs when the performance degradation reaches the pre-determined critical level. This article considers the reliability qualification test based on a more tightened critical value at the earlier stage to reduce the evaluation testing time and cost. A numerical example is provided to illustrate how to use the developed reliability qualification test.

A Study on the Problem Analysis and the Way of Improvement in Mathematical Performance Assessment (수학과 수행평가의 문제점 분석 및 그 개선방안에 관한 연구)

  • 정덕찬
    • Journal of the Korean School Mathematics Society
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    • v.3 no.2
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    • pp.133-154
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    • 2000
  • The purpose of this study is to analyze theoretically suggested performance test and find out the actual conditions is math class at high schools and to suggest some devices for improvement for the various problems. To achieve this goal of study, I applied a performance test to the first graders of high school for one semester, and analyzed various phenomena which appeared during its practice. I made several questionnaire based on the materials of an academic seminar, "Several questions and devices for the improvement on mathematics performance test" And through the analysis, I pointed several problems of the performance test and proposed alternative plans. Several practical alternatives can be suggested for the problems appeared in the operation of performance test. The most important thing than any other technical solution in teachers′ diverse endeavor and enthusiastic research attitude to overcome the difficulties. Teachers′ spontaneousness is the foundation to enhance their own specialty and eradicate the propriety of the performance test.

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Design of Reliability Qualification Test based on Performance Distribution (성능분포에 기초한 신뢰성 인정시험 설계)

  • Kwon, Young-Il
    • Journal of Applied Reliability
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    • v.10 no.1
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    • pp.1-9
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    • 2010
  • In general, the performance of a component degrades as time goes by and failure of a component occurs when the performance degradation reaches a pre-specified level. It is difficult to obtain the failure time distribution data or the necessary number of failure data especially for the metal or machine part. Thus, a design of reliability qualification test based on performance distribution is more effective than failure time distribution. In this study, a performance-based reliability qualification test is developed and a numerical example is provided to illustrate the use of the developed reliability qualification test. This approach could be applied to many kinds of metal or machine part whose magnitude of strength could not be evaluated during at any random points but judgement can be made by only failure of the part. Besides, it is also possible that any parts which have a similar failure characteristics could be applicable to the developed reliability qualification test.