• Title, Summary, Keyword: Model test

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A on Permeability Characteristics of Soil-Bentonite Mixture (Soil-Bentonite 혼합토의 투수 특성 연구)

  • Im, Eun-Sang;Snin, Dong-Hoon;Cho, Seong-Eun;Kim, Jea-Hong
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.852-857
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    • 2009
  • Recently the centrifuge test has been used increasingly to clarify a problem of seepage in dam. However, one of the most difficult challenges in the testing is to conform permeability properties of model ground to the prototype. In order to resolve the problem, a few solutions, such as an increase of pore water viscosity and a regulation of water permeability, are suggested. Although the use of prototype materials is principles if a model test is carried out, the materials of similarity gradation is used in the centrifuge model test because of the nature of the model test for dam. Therefore, we choose the latter method for model ground materials. In this study, the permeability properties of soil-bentonite mixtures are studied through the permeation test using triaxial compaction test apparatus.

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Wind Tunnel Test for Scaled Wind Turbine Model (Scale effect correction) (축소형 풍력터빈 풍동시험-축소효과 보상기법)

  • Cho, Tae-Hwan;Kim, Yang-Won;Park, Young-Min;Chang, Byeong-Hee
    • New & Renewable Energy
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    • v.4 no.2
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    • pp.87-93
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    • 2008
  • Wind tunnel test for the 12% scaled model of NREL Phase VI wind turbine was conducted in KARI low speed wind tunnel for $2006{\sim}2007$. The 1st and 2nd test was designed to find out the wind tunnel test method for the blade manufacturing accuracy and surface treatment method by using the composite and aluminum blades. And the 3rd test was designed to study the scale effect. The chord extension method which was used for Bo-105 40% scaled model was adapted for scale effect correction. Test results shows that the chord extension method works well for the torque slope but the maximum torque for scaled model is about 8% below than the real scale model. New correction method to correct this offset was proposed.

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An Experimental Study on the Flexural Behavior of 1/10-Scale Reinforced Concrete Beams (1/10 축소 철근콘크리트보의 휨 거동에관한 실험적 연구)

  • 이한선;장신혁;김상규
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.325-330
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    • 1995
  • Three types of model concrete with different mix ratios for 1/10 scale reinforced concrete model were made and tested to find the best solution for the simulation of mechanical characteristics of prototype concrete. Scaled reinforcing materials in diameter(D1.8) having similar con-figuration and mechanical properties with commercial deformed bars(D19) were prepared for 1/10 scale model tests of reinforced concrete structures. Two types of model test using D1.8 model reinforcing bars and model concrete, monotonic simple beam test and cyclic cantilever beam test, were performed to ensure and check the similitude of bond behavior between 1/10 scale model and prototype. The test results showed that the flexural behavior of 1/10 scale models can be simulated with accuracy enough for practical use in monotonic and cyclic loading test.

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Validation of the vehicle dynamic model for the static vehicle testing (정차상태 시험 결과를 이용한 차량동특성 해석 모델의 검증)

  • Park, Kil-Bae;Seong, Jae-Ho
    • Proceedings of the KSR Conference
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    • pp.317-325
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    • 2011
  • Vehicle model validation for the static vehicle testing has been done by comparison of the simulation results and test results and the parameters of the vehicle model to be used in the simulation have been adjusted to reflect the measured behaviour. The vehicle model fort the simulation should be validated by suitable tests and/or practical experience. The static vehicle test used to validate the vehicle model are the weight measurement, the wheel offloading test, the bogie rotational resistance test and the sway test. Finally, the computer simulation model has been validated and using the validated vehicle model the acceptance of the vehicle safety of the resistance to flange climbing derailment at low speed can be examined.

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A Cost Model of Hierarchical Automatic Test Pattern Generation Algorithms for Combinational Logic Circuits (조합회로에 대한 계층 구조적 테스트 패턴 생성 알고리즘의 비용 모델)

  • Hyoung Bok Min
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.28A no.12
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    • pp.65-72
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    • 1991
  • A cost model of test generation is presented in this paper. The cost of flat gate-level and hierarchical modular level test generation for combinational logic circuits are modeled. The model shows that the cost of hierarchical test generation grows as GlogGunder some assuptions, while the cost of gate-level test generation grows $G^2<$/TEX>, where G is the number of gates in a circuit under test. The cost model derived in this paper is used to explain why some test generation techniques are faster and why hierarchical test generators should be faster than flat test generators on large circuits.

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Testing Outliers in Nonlinear Regression

  • Kahng, Myung-Wook
    • Journal of the Korean Statistical Society
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    • v.24 no.2
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    • pp.419-437
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    • 1995
  • Given the specific mean shift outlier model, several standard approaches to obtaining test statistic for outliers are discussed. Each of these is developed in detail for the nonlinear regression model, and each leads to an equivalent distribution. The geometric interpretations of the statistics and accuracy of linear approximation are also presented.

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Analysis of pipe roof method test with a reduced-scale model (축소모형 강관추진실험 경향 분석)

  • Eum, Ki-Young;Jung, Kwan-Dong;Lee, Sung-Hyuk;Cheon, Jeong-Yeon;Jang, Hee-Jung;Lee, Jong-Tae
    • Proceedings of the KSR Conference
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    • pp.664-670
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    • 2010
  • The study on mechanical behavior of the structure at the site includes experimental method and numerical analysis method. Experimental method is categorized into true-scale test and laboratory model test. A laboratory model test is to monitor the failure mechanism with a model simulated similar with a real ground so as to identify the quantitative result, while a true-scale model test is the approach which enables to identify the potential problems that may occur with a simulated construction situation similar with a real site circumstance. Thus this study was intended to carry out the experimental test of non open-cut excavation by pipe roof method which is mostly common in domestic sites. as well as was aimed at identifying the ground behavior occurred during pipe penetration using laboratory model test. Appropriate reduced-scale model was selected, taking into account of domestic geological characteristics and operation characteristics of traditional and high-speed rail trains and the qualitative evaluation of displacement was carried out based on a certain ground loss volume depending on excavation after categorizing trackbed settlement pattern by depth of top soil.

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Design and Application of the TFM Based System Test Model for the Weapon System Embedded Software (무기체계 임베디드 소프트웨어에 대한 TFM 기반 시스템 테스트 모델 설계 및 적용)

  • Kim, Jae-Hwan;Yoon, Hee-Byung
    • The KIPS Transactions:PartD
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    • v.13D no.7
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    • pp.923-930
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    • 2006
  • In this paper we design the system test model for the weapon system embedded software based on the Time Factor Method(TFM) considering time factors and suggest the results through the case study. For doing this, we discuss the features, system tests and the object-oriented model based UML notations of the weapon system embedded software. And we give a test method considering time factors, a measuring method to time factors, and a test case selection algorithm as an approach to the TFM for designing the system test model. The TFM based system test model consists of three factors (X, Y, Z) in the weapon system embedded software. With this model, we can extract test cases through the selection algorithm for a maximum time path in 'X', identify the objects related to the Sequence Diagram in 'Y' and measure the execution time of each objects which is identified by the Timing Diagram in 'Z' Also, we present the method of extracting the system test cases by applying the proposed system test model to the 'Multi-function missile defense system'.

Defect Prediction Using Machine Learning Algorithm in Semiconductor Test Process (기계학습 알고리즘을 이용한 반도체 테스트공정의 불량 예측)

  • Jang, Suyeol;Jo, Mansik;Cho, Seulki;Moon, Byungmoo
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.31 no.7
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    • pp.450-454
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    • 2018
  • Because of the rapidly changing environment and high uncertainties, the semiconductor industry is in need of appropriate forecasting technology. In particular, both the cost and time in the test process are increasing because the process becomes complicated and there are more factors to consider. In this paper, we propose a prediction model that predicts a final "good" or "bad" on the basis of preconditioning test data generated in the semiconductor test process. The proposed prediction model solves the classification and regression problems that are often dealt with in the semiconductor process and constructs a reliable prediction model. We also implemented a prediction model through various machine learning algorithms. We compared the performance of the prediction models constructed through each algorithm. Actual data of the semiconductor test process was used for accurate prediction model construction and effective test verification.

A Novel Approach for Deriving Test Scenarios and Test Cases from Events

  • Singh, Sandeep K.;Sabharwal, Sangeeta;Gupta, J.P.
    • Journal of Information Processing Systems
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    • v.8 no.2
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    • pp.213-240
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    • 2012
  • Safety critical systems, real time systems, and event-based systems have a complex set of events and their own interdependency, which makes them difficult to test ma Safety critic Safety critical systems, real time systems, and event-based systems have a complex set of events and their own interdependency, which makes them difficult to test manually. In order to cut down on costs, save time, and increase reliability, the model based testing approach is the best solution. Such an approach does not require applications or codes prior to generating test cases, so it leads to the early detection of faults, which helps in reducing the development time. Several model-based testing approaches have used different UML models but very few works have been reported to show the generation of test cases that use events. Test cases that use events are an apt choice for these types of systems. However, these works have considered events that happen at a user interface level in a system while other events that happen in a system are not considered. Such works have limited applications in testing the GUI of a system. In this paper, a novel model-based testing approach is presented using business events, state events, and control events that have been captured directly from requirement specifications. The proposed approach documents events in event templates and then builds an event-flow model and a fault model for a system. Test coverage criterion and an algorithm are designed using these models to generate event sequence based test scenarios and test cases. Unlike other event based approaches, our approach is able to detect the proposed faults in a system. A prototype tool is developed to automate and evaluate the applicability of the entire process. Results have shown that the proposed approach and supportive tool is able to successfully derive test scenarios and test cases from the requirement specifications of safety critical systems, real time systems, and event based systems.