• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.5
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• pp.2338-2346
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• 2012

According to the size of mobile applications has been expanded, the coupling of among mobile applications or servers also will be growing. The growth of mobile application's size means that predicting design for variability should be involved. If mobile application's change is occurred, application should be reinstalled totally. However this reinstallation can raise side-effects in case of high-coupling applications. Therefore, this paper proposes a technique of designing variability for mobile applications in android platform. Proposed technique is separated into selection technique and plug-in technique.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2011.04a
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• pp.574-578
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• 2011

본 논문에서는 해저케이블 부두 하역용 장비인 코일링 암(coiling arm)에 대한 구조설계 및 해석을 수행하였다. 본 연구에서는 구조설계를 위해 3차원 CAD프로그램을 이용하여 모델링하였고 구조해석 프로그램을 이용하여 유한요소법에 기초한 전산해석 기법으로 해석을 수행하였다. 코일링 암의 목적에 맞추어 케이블을 케이블 탱크에 가이드 할 수 있도록 베어링 및 롤러를 설계하여 메인 암이 회전하고 케이블 가이드가 이동할 수 있도록 하였고, 기존의 외국 모델에서 사용하던 와이어 및 모터 시스템을 이용한 케이블 가이드 작동방식을 유압 시스템을 이용한 작동방식으로 변경하여 설계 및 제작이 쉽고 사용자가 직관적으로 작동할 수 있도록 설계하였다. 자중 및 케이블 하중에 대한 응력 해석을 수행하였고, 유압시스템에 의한 파손 가능성을 고려하였다. 케이블 가이드에 이동 및 지면 경사도에 따른 전복해석을 수행하였으며, 설치 장소를 고려한 풍하중 효과도 추가로 고려하였다. 본 연구를 통해 코일링 암의 작동방식을 개선하였으며 설계 및 해석 방법을 확립과 더불어 국내 최초로 실제 코일링 암을 제작 및 설치하였다.

• Journal of the Korea Society of Computer and Information
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• v.8 no.2
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• pp.37-43
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• 2003

The purpose of this thesis is to detect multiple vehicles using sequence image analysis at process that detect forward vehicles and lane from sequential color images. Detection of vehicles candidate area uses shadow characteristic and edge information in one frame. And, method to detect multiple vehicles area analyzes Estimation of Vehicle(EOV) and Accumulated Similarity Function(ASF) of vehicles candidate areas that exist in sequential images and examine possibility to be vehicles. Most researches detected a forward vehicles in road images but this research presented method to detect several vehicles and apply enough in havy traffic. To verify the effects of the proposed method, we capture the road images with notebook and CCD camera for PC and present the results such as processing time, accuracy and vehicles detection in the images.

• Geotechnical Engineering
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• v.10 no.3
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• pp.119-134
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• 1994

In order to assess the possibility of using steel fibers in the fissured ciays, uniaxial compression tests were performed on both unreinforced and reinforced clay samples containing a pre-existing crack. Test results showed that the steel fiber reinforcement increased resistance to cracks initiation and their propagation, and therefore increased both stress at crack growth initiation and peak stress at failure. The increase in resistance to cracks initiation and their propagation was related to the arresting or deflecting the crack propagation in clay samples by steel fibers. A theoretical interpretation of experimental results was made using fracture mechanics theory and pull-out mechanisms in fiber reinforced materials. It was revealed that the steel fibers had bridging effect through their pull-out action that caused an increased resistance to the propagation of the cracks in the samples. The predicted pull-out force based on theoretical analyses agreed reasonably well with the measured values obtained from pull-out tests.

• Korean Journal of Crystallography
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• v.13 no.1
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• pp.31-35
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• 2002

The possibility of producing the pigments from potash feldspar was studied by adopting the mechanical alloying technique under various gas environments. The experiments were carried out by varying grinding time with the addition of copper metal and titanium oxide in N₂, O₂, He, CO₂, H₂and air atmospheres. The mixture of the potash feldspar concentrate and copper and titanium dioxide are finely ground by a planetary ball mill, and then the composite powders were calcined at 1200℃ for 20 minutes. As a result, the calcined feldspar with 1 wt% of Cu has shown various colors like green in air, black in O₂, dark green in CO₂, brown in H₂, purple in He, and pale green in N₂ atmospheres, respectively.

• Journal of The Korean Association For Science Education
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• v.22 no.2
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• pp.261-266
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• 2002

To investigate the pupils' ideas about appropriate scientific inquiry problem, we have chosen the 105 boys and girls of 7th grade in a middle school in Seoul, Korea. Their marks in science are within the highest one-third of their classes. The pupils have made their own scientific inquiry questions, which is to be investigated by themselves in summer vacation. The 105 inquiry questions were gathered and evaluated by the pupils with 5-point Likert scale. From these, we have found that the questions inquiring novel phenomena, questioning causality, or containing scientific terms were evaluated as appropriate. Some questions were changed during performance. The pupils have changed their inquiry problems if they feel any difficulties in performing the inquiry.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.41 no.2
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• pp.143-150
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• 2015

This study demonstrates an effective one-pot regioselective synthesis of 3,7-diarylpyrazolo [1,5-${\alpha}$]pyrimidines. Moreover, the derivatives obtained were effective CB1R antagonists. These pyrazolo [1,5-${\alpha}$]pyrimidines with diaryl groups at the 3,7-positions are potential pharmacophores for CB1R candidates.

• Korean Journal of Construction Engineering and Management
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• v.1 no.1 s.1
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• pp.53-62
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• 2000

This study proposes FREES(Fuzzy Risk Evaluation Expert System) for analyzing and evaluating risks occurring during the construction process. The feasibility of this system model was tested by virtual scenario. For the development of the model, at first, risk breakdown structure was established based on risks identified in the existing researches, that is quantitative and qualitative. FREES can reflect human cognition process in the risk analysis and evaluation by adopting artificial intelligence fuzzy theory, differentiating the existing quantitative analysis model. The FREES can be applied to all the project phases from planning to operation & maintenance stage.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.29 no.6
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• pp.1375-1382
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• 2019

The latest version of commercial protector, Themida, has been updated, it is impossible to apply a normalized unpacking mechanism from previous studies by disable the use of a virtual memory allocation that provides initial data to be tracked. In addition, compared to the previous version, which had many values that determined during execution and easy to track dynamically, it is difficult to track dynamically due to values determined at the time of applying the protector. We will look at how the latest version of Themida make it difficult to normalize the API wrapping process by adopted techniques and examine the possibilities of applying the unpacking techniques to further develop an automated unpacking system.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2011.10a
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• pp.669-671
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• 2011

In this paper propose open source software the tools to build and continuous integration environment that can be used to improve software quality testing.