• International Journal of Quality Innovation
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• 제1권1호
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• pp.64-74
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• 2000

This paper investigates the issue of performance testing on web browsing environments. Among the typical non-functional characteristics, index of link validity will be deeply explored. A framework to certify link correctness in web site is proposed. All possible navigation paths are first formulated to represent a usage model with the Markov chain property, which is then used to generate test script file statistically. With collecting any existing failure information followed by tracing these testing browsed paths, certification analysis may be performed by applying Markov chain theory. The certification result will yield some significant information such as: test coverage, reliability measure, confidence interval, etc. The proposed mechanism may provide not only completed but also systemic methodologies to find any linking errors and other web technologies errors. Besides, an actual practice of the proposed approach to a web-based system will be demonstrated quantitatively through a certification tool.

• International Journal of Computer Science & Network Security
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• 제21권5호
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• pp.217-221
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• 2021

Recent studies have indicated that mobile markets harbor applications (apps) that are either malicious or vulnerable, compromising millions of devices. Some studies indicate that 96% of companies' employees have used at least one malicious app. Some app stores do not employ security quality attributes regarding authorization, which is the function of specifying access rights to access control resources. However, well-defined access control policies can prevent mobile apps from being malicious. The problem is that those who oversee app market sites lack the mechanisms necessary to assess mobile app security. Because thousands of apps are constantly being added to or updated on mobile app market sites, these security testing mechanisms must be automated. This paper, therefore, introduces a new mechanism for testing mobile app security, using white-box testing in a way that is compatible with Bring Your Own Device (BYOD) working environments. This framework will benefit end-users, organizations that oversee app markets, and employers who implement the BYOD trend.

• 한국작물학회지
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• 제23권2호
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• pp.99-104
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• 1978

This study was conducted to evaluate the yield performance, adaptation and stability of selected 17 local soybean lines, and determine the optimum number of locations and years in testing program. Among 12 lines having high performance than standard variety Bong-Eui, nine lines were better adapted to favorable environments with high stability. while three were adapted to unfavorable environments with instability. The data from over eight locations in a one-year test would be sufficient to evaluate high yielding lines but the accuracy of selection would be increased by testing in three years instead of one.

• 한국실내디자인학회논문집
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• 제33호
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• pp.27-35
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• 2002

The qualify of preschool education is related to the qualify of the physical environment, This research is aiming to develop and validate the set of scales for the measurement of physical quality of the interior spaces in child care facilities. The research has been in three major phases: (1)the development of indicative sub-scales for the description, measurement and evaluation of the physical designed quality of early childhood environments (2)two rounds of iterative phases of reliability and validity testing of the scales through expert panels and observational field-testing and (3)implications for future research to be done. 13 sub-scales were developed, which are based on Moore's 15 design principal for child care environments. And each sub-scale includes several evaluation items based upon developmental theory, existing empirical literature, and Korean, Australian and American child care standards. This set of scales will (1)aid research on the effects of environmental variables on quality of child care facilities for infants, toddlers, and preschoolers; (2)permit evaluation of such environments to identify areas of needed improvement; and (3)provide information for policy makers, parents, administrators, and designers/architects.

• 한국군사과학기술학회지
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• 제14권2호
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• pp.181-188
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• 2011

A simulation technique, which simulate dynamic motion and communication environments of ship in the lab, is needed in order to reduce the testing cost when we evaluate the transfer alignment performance of shipboard INS. Hardware-In-the-Loop Simulation(HILS) can be used as an effective test method for those system because it can provide flexible and realistic simulation environments, various test scenario, and repeated test environment in the lab without additional cost and person. This paper presents the methods for implementing the real time HILS environment for testing transfer alignment performance of shipboard INS. It includes real time executive for controlling realtime simulation and calculating the ship motion, communication method for interfacing between the systems, and coordinate transformation method for converting real ship coordinate attitude data to lab coordinate attitude data.

• Steel and Composite Structures
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• 제19권6호
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• pp.1549-1560
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• 2015

This paper presents the characterization of fatigue crack in the A283 Grade C steel using the MMM method by identifying the effects of magnetic flux leakage towards the crack growth rate, da/dN, and crack length. The previous and current research on the relation between MMM parameters and fatigue crack effect is still unclear and requires specific analysis to validate that. This method is considered to be a passive magnetic method among other Non-Destructive Testing (NDT) methods. The tension-tension fatigue test was conducted with a testing frequency of 10 Hz with 4 kN loaded, meanwhile the MMM response signals were captured using a MMM instrument. A correlation between the crack growth rate and magnetic flux leakage produces a sigmoid shape curve with a constant values which present the gradient, m value is in the ranges of 1.4357 to 4.0506, and the y-intercept, log C in the ranges of $4{\times}10^{-7}$ to 0.0303. Moreover, a linear relation was obtained between the crack length and magnetic flux leakage which present the R-Squared values is at 0.830 to 0.978. Therefore, MMM method has their own capability to investigate and characterize the fatigue crack effects as a main source of fracture mechanism for ferrous-based materials.

• 비파괴검사학회지
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• 제18권1호
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• pp.27-32
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• 1998

비파괴검사를 이해하고 습득하기 위해 필수적인 실습 위주의 교육 환경을 대체할 수 있는 수단으로, 가상적인 실습 환경을 제공하는 지능형 교육 시스템을 설계하고, 이를 구현하였다. 용접부 및 다양한 제품을 검사하는데 필수적인 비파괴검사는 그 전문기술을 이해하기 위해 다양한 현장 경험을 필요로 할 뿐만 아니라, 기술지식의 지속적인 유지를 위해 반복적인 교육과 훈련을 필요로 한다. 이러한 문제를 해결하기 위해 개인용 컴퓨터를 이용하여 개별학습이 가능한 지능형 교육 시스템을 개발하였으며, 가상 실습 환경의 구축과 개별학습을 효율적으로 지원하기 위해 학습 결과를 자기진단 할 수 있는 평가 시스템의 연구가 필요하다.

• 한국정보과학회논문지:소프트웨어및응용
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• 제29권12호
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• pp.883-894
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• 2002

고전적인 결정적 테스팅 방법은 명세와 프로그램의 동치 관계를 기반으로 병행 프로그램의 수행 경로를 제어한다. 따라서, 주어진 시퀀스를 직접 구현하지 않고, 그와 의미적으로 동일한 다른 시퀀스를 구현한 프로그램에 대해서는 결정적 테스팅 방법을 적용하기 어렵다. 이를 해결하기 위해서, 우리는 테스트 시퀀스와 의미적으로 동일한 모든 시퀀스들을 허용하는 동치 집합 오토마타를 이용한 오토마타 기반 테스팅 방법을 제안하였었다. 이 논문에서는 Java 다중 스레드 프로그램에 대한 오토마타 기반 테스팅 환경을 제안하고, 테스팅 환경 내의 테스트 수행 지원 도구를 설계하고 구현하는 방법을 제안한다. 테스트 수행 지원 도구에서는 주어진 Java 다중 스레드 프로그램을 오토마타 기반의 결정적 테스팅 방법이 적용된 프로그램으로 변환하고, 이 변환된 프로그램을 수행함으로써 테스트의 결과를 알 수 있다. 이를 위해서 테스트 수행 지원 도구 내에서 동치 집합 오토마타를 생성하는 오토마타 생성기와 프로그램의 수행을 제어하기 위한 재연 제어기를 설계하고 구현한다. 그리고, 가스 충전소 예제를 이용하여 오토마타 기반의 결정적 테스팅의 과정 및 효과를 기술한다.

• Tribology and Lubricants
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• 제15권2호
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• pp.178-183
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• 1999

This paper presents friction and wear related results of thermite and gas pressure welded rails under various environmental contact conditions. A welded rail which was fabricated by thermite welding and gas pressure one has been tested over full range of test conditions in a pin-on-disk wear testing machine. The results show that the friction coefficient and wear rates of a welded rail are heavily dependent on the contact pressures and sliding environments for two welding methods such as thermite and gas pressure weldings.

• The Journal of the Acoustical Society of Korea
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• 제18권3E호
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• pp.3-8
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• 1999

In speech recognition for real-world applications, the performance degradation due to the mismatch introduced between training and testing environments should be overcome. In this paper, to reduce this mismatch, we provide a hybrid method of spectral subtraction and residual noise masking. We also employ multiple model approach to obtain improved robustness over various noise environments. In this approach, multiple model sets are made according to several noise masking levels and then a model set appropriate for the estimated noise level is selected automatically in recognition phase. According to speaker independent isolated word recognition experiments in car noise environments, the proposed method using model sets with only two masking levels reduced average word error rate by 60% in comparison with spectral subtraction method.