• Title/Summary/Keyword: model test

Search Result 20,116, Processing Time 0.053 seconds

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
    • /
    • 2009.03a
    • /
    • pp.852-857
    • /
    • 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.

  • PDF

Development of 1/60th Scale Moving Model Rig Using the Compressed Air Launcher and One-Wire Guidance System of Train Model (압축공기 발사기에 단선 와이어 유도방식을 적용한 1/60축척 터널주행 열차모형 시험기 개발에 대한 연구)

  • Kim, Dong-Hyeon;O, Il-Geun
    • Transactions of the Korean Society of Mechanical Engineers B
    • /
    • v.25 no.5
    • /
    • pp.634-644
    • /
    • 2001
  • The test facility of a 1/60-scale model for train-tunnel systems has been recently developed to investigate the effects of tunnel portal shapes, hood shapes and air-shafts for reducing the micro-pressure waves radiating towards the surroundings from the tunnel exit. The present test rig has been advanced from a 1/70-scale facility at NLR in Netherlands. The NLR test rig has the two-wise guidance system that needs two ears attached on the external surface of a model train nose. Therefore, their train models have irregular nose shapes. The main characteristics of the present facility are that the train model is guided by only one wire from the compressed air launcher to the absorber parts of test facility and the wire guidance hole is located at the axial center of a train model. In the present test rig, after a train model is launched, the air jet from the launcher does not enter the tunnel model. Experimental results were compared with numerical predictions to prove the performance of the test facility.

A Study on the Design of an Efficient Audit Model in the Area of Information System Testing Activities

  • Kim, Hee Wan;Jung, Yong Gyu
    • International Journal of Advanced Culture Technology
    • /
    • v.9 no.1
    • /
    • pp.210-217
    • /
    • 2021
  • In the case of an agile-based project, it was inadequate to perform a comprehensive inspection and evaluation on the establishment and operation of an information system by performing audit only with the audit and inspection elements provided by the existing information system audit and inspection system. In particular, in the case of the test activity area, it was necessary to improve the test activity audit check items to comprehensively check the agile-based development process by applying the existing audit system. To this end, a test activity improvement check model of the agile methodology audit model was presented by applying the repetition concept, a characteristic of the agile methodology. In order to empirically verify the model of this study, a survey was conducted for auditors and designers/developers who have experience in performing agile-based projects and auditing information systems. As a result of the questionnaire on the integrated test and system test in the test stage, more than 70% of the respondents were found to be suitable. More than 80% of the respondents judged that it was appropriate as a result of the questionnaire on "improvement and regression test progress according to integrated test and system test results" and "integrated test and functional actions of components and subsystems".

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
    • /
    • 2011.05a
    • /
    • pp.317-325
    • /
    • 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.

  • PDF

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
    • /
    • 1995.04a
    • /
    • pp.325-330
    • /
    • 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.

  • PDF

Testing Outliers in Nonlinear Regression

  • Kahng, Myung-Wook
    • Journal of the Korean Statistical Society
    • /
    • v.24 no.2
    • /
    • pp.419-437
    • /
    • 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.

  • PDF

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
    • /
    • v.28A no.12
    • /
    • pp.65-72
    • /
    • 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.

  • PDF

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
    • /
    • 2010.06a
    • /
    • pp.664-670
    • /
    • 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.

  • PDF

Analytical study on seepage behavior of a small-scale capillary barrier system under lateral no-flow condition

  • Byeong-Su Kim
    • Geomechanics and Engineering
    • /
    • v.35 no.1
    • /
    • pp.13-27
    • /
    • 2023
  • The model production for large-scale (lateral length ≥ 2.0 m) capillary barrier (CB) model tests is time and cost-intensive. To address these limitations, the framework of a small-scale CB (SSCB) model test under the lateral no-flow condition has been established. In this study, to validate the experimental methodology of the SSCB model test, a series of seepage analyses on the SSCB model test and engineered slopes in the same and additional test conditions was performed. First, the seepage behavior and diversion length (LD) of the CB system were investigated under three rainfall conditions. In the seepage analysis for the engineered slopes with different slope angles and sand layer thicknesses, the LD increased with the increase in the slope angle and sand layer thickness, although the increase rate of the LD with the sand layer thickness exhibited an upper limit. The LD values from the seepage analysis agreed well with the results estimated from the laboratory SSCB mode test. Therefore, it can be concluded that the experimental methodology of the SSCB model test is one of the promising alternatives to efficiently evaluate the water-shielding performance of the CB system for an engineered slope.

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
    • /
    • v.13D no.7 s.110
    • /
    • pp.923-930
    • /
    • 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'.