• Journal of Korean Society of Steel Construction
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• v.13 no.2
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• pp.211-221
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• 2001

The dynamic force estimation and strength design of KALES(Korea Accelerated Loading and Environmental Simulator) are studied. The KALES is continuously rotating the test track and subjected to the dynamic or impact forces during operation since the track is composed of straight and curved line. To estimate the dynamic equation for the model car which was already made is derived with analytical and experimental techniques. Using similarity relationships between the model car and KALES, the dynamic force and stability properties for KALES can be predicted. The stress analysis and fatigue life estimation of KALES is also estimated with the calculated dynamic load. From the stress analysis and fatigue life estimation results, it was found that the design of KALES is safe.

• 한국도로학회:학술대회논문집
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• 2000.11a
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• pp.21-25
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• 2000

• 한국정보교육학회:학술대회논문집
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• 2011.01a
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• pp.29-35
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• 2011

With the society rapidly changing, children are being asked respond quickly to these changes. Therefore, how children learn and think comes before what to teach, and we need to come up with ways to nurture their ability to proactively control their lives and studies. We attempt to use the technique of Accelerated learning, which focuses on the student's own ability toacquire and use information, to enhance the efficiency of information technology education. We designed the PLAY model based on accelerated learning and Multiple Intelligence Theory, and conducted ten experimental sessions on two groups of 70 second grade elementary school students.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2009.04a
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• pp.110-113
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• 2009

본 연구에서는 무선센서노드을 이용하여 강판형 철도교량의 전형적인 손상유형인 거더부의 휨강성 저하와 지점부의 볼트풀림을 효과적으로 모니터링할 수 있는 하이브리드 모니터링 기법을 제안하였다. 이를 위해 다음과 같은 연구가 수행되었다. 첫째, 본 연구진에 의해 개발된 가속도 및 임피던스기반 무선센서노드를 간략하게 소개하였다. 둘째, 가속도 및 임피던스 신호를 이용하여 효과적인 손상모니터링이 가능한 기법들을 선정하였다. 마지막으로, 개발된 가속도 및 임피던스기반 무선센서노드를 모형 강판형 철도교에 설치하고, 일련의 손상 시나리오에 따른 하이브리드 모니터링을 수행하여 무선센서노드 및 모니터링 기법의 성능을 평가하였다.

• The Korean Journal of Applied Statistics
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• v.13 no.2
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• pp.563-573
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• 2000

In this paper, we propose three estimators of Kullback-Leibler Information functions using the data from accelerated life tesb. This acceleration model is assumed to be a tampered random variable model. Some asymptotic properties of proposed estimators are proved. Simulations are performed for comparing the small sample properties of the proposed estimators under use condition of accelerated life test.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2010.04a
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• pp.662-665
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• 2010

본 연구에서는 전역적-국부적 구조건전성 모니터링을 위한 무선센서노드로서 가속도 및 임피던스 응답신호의 계측이 가능한 다기능 무선센서노드를 개발하였다. 이를 위해 첫째, 가속도 및 임피던스 응답의 계측이 가능한 다기능 무선센서노드를 설계 및 제작하였다. 둘째, 다기능 무선센서노드의 성능검증을 위하여 트러스교 모형을 대상으로 진동실험을 수행하였다. 셋째, 다기능 무선센서노드로부터 취득된 가속도 및 임피던스 응답을 이용하여 트러스 구조물의 구조 건전성 모니터링을 통해 다기능 무선센서노드의 적용성을 검증하였다.

• Journal of Korean Tunnelling and Underground Space Association
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• v.17 no.6
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• pp.695-702
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• 2015

Recently, the improvement of mechanical and theoretical issues in geo-centrifuge test enhances the applicability and accuracy of the test. Geo-centrifuge test is appropriate to simulate the behaviors of underground structures like tunnel, since tunnel interacts with the soil and/or rock around it and the test can embody the in-situ stress conditions effectively. In this study, the seismic behaviors of twin tunnel were analyzed based on geo-centrifuge test. Flexible segment to mitigate seismic acceleration were implemented in the model with thin and thick thickness. Based on the test results, it was found that flexible segment can decrease the peak acceleration generally, however, thin flexible segment was not able to reduce peak acceleration in short-period seismic wave. Thick flexible segment was more effective in case of high bedrock acceleration condition. Additionally, 3-dimensional numerical analysis was performed to verify the characteristics of seismic behavior and the effect of flexible segment. Consequently, the numerical analysis result showed good agreement with the test result.

• The Journal of Society for e-Business Studies
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• v.22 no.4
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• pp.159-173
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• 2017

In order to provide technical financial support to small and medium-sized venture companies based on technology, the government implemented the TCB evaluation, which is a kind of technology rating evaluation, from the Kibo and a qualified private TCB. In this paper, we briefly review the current state of TCB evaluation and available indicators related to technology evaluation accumulated in the Korea Credit Information Services (TDB), and then use indicators that have a significant effect on the technology rating score. Multiple regression techniques will be explored. And the relative importance and classification accuracy of the indicators were calculated by applying the key indicators as independent features applied to the generalized boosting model, which is a representative machine learning classifier, as the class influence and the fitness of each model. As a result of the analysis, it was analyzed that the relative importance between the two models was not significantly different. However, GBM model had more weight on the InnoBiz certification, R&D department, patent registration and venture confirmation indicators than regression model.

• Journal of Astronomy and Space Sciences
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• v.15 no.1
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• pp.101-110
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• 1998

We calculated line profiles of 32 Cyg with an assumed $str{\"{o}}mgren$ sphere at orbital phases 0.06 and 0.78. The wind models with $Alfv\'{e}n$ waves show diminished line profiles compared to those of the models using power velocity laws. The reduced density of absorbers in HII region produce weak profiles, but line profiles at ${\phi}=0.06$ do not show the differences except in the red edge of absorption. At ${\phi}=0.78$ however, we could reproduce the line profiles of Alfven waves model by the power law models with two velocity gradients. It suggests that the power law model with 2 acceleration regions could reduce the errors in the theoretical line formation with no consideration of wind acceleration mechanism.nism.

• 한국데이터정보과학회:학술대회논문집
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• 2003.10a
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• pp.171-176
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• 2003

전기 설비의 가속 수명시험에서 절연재료의 열 수명 시험자료에 대한 통계적 분석지침으로 1987년 ANSI/IEEE Std. 101이 제정된 이래, 많은 실험의 결과 분석에 이용되어져 오고 있다. 그러나, ANSI/IEEE Std. 101 에서는 제한된 환경 하에서 얻어지는 소수의 자료를 분석에 이용하고 있어, 분석 결과의 정확성에 의문이 제기되고 있다. 본 논문에서는, ANSI/IEEE Std. 101에서 사용한 자료에서 얻은 통계량들을 근거로 Monte Carlo Simulation을 실시하여 분석지침에서 제시한 결과와 비교하여 보았다.