• Journal of the Korean Society for Nondestructive Testing
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• v.27 no.2
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• pp.164-172
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• 2007

Surface cracks in concrete are common defects that can cause significant deterioration and failure of concrete structures. Therefore, the early detection, assessment, and repair of the cracks in concrete are very important for the structural health. Among studies for crack depth assessment, self-calibrating surface wave transmission method seems to be a promising nondestructive technique, though it is still difficult in determination of the crack depth due to the variation of the experimentally obtained transmission functions. In this paper, the spectral energy transmission method is proposed for the crack depth estimation in concrete structures. To verify this method, an experimental study was carried out on a concrete slab with various surface-opening crack depths. Finally, effectiveness of the proposed method is validated by comparing the conventional time-of-flight and cutting frequency based methods. The results show an excellent potential as a practical and reliable in-situ nondestructive method for the crack depth estimation in concrete structures.

• Proceedings of the Korea Information Processing Society Conference
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• 2019.10a
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• pp.723-725
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• 2019

이 시스템은 미래 혁신 기술로 각광받고 있는 블록체인 기술의 특징을 이용하여 사용자들의 거래 내역을 블록화 하여 보안성을 강화하고 결재정보나 개인정보를 보호해서 안정성을 추구하며 블록체인에서 구현하기 어려운 결제의 불완전성을 극복하려는 시스템이다. 본 논문에서는 이러한 시스템을 설계한 과정 중에 일부분인 블록체인의 유효성검사, 블록 저장한 화면들을 보여주고 설명하고 있다.

• Proceedings of the Korean Information Science Society Conference
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• 2002.04a
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• pp.142-144
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• 2002

본 논문에서는 취약성 탐지 스크립트의 원격 편집기를 설계 및 구현하였다. 원격 편집기는 Windows 계열의 시스템에서 구동되며 스크립트 데이터베이스가 저장되어 있는 서버로부터 스크립트를 인출하여 수정 후 저장하거나 새로운 스크립트를 작성하여 저장한다. 편집기는 스크립트의 작성 및 편집을 위한 편집기능, 서버와의 HTTP 프로토콜 기반 통신 기능, 스크립트의 사용 용도나 스크립트의 경향과 특성을 파악하는 등의 특성분석기능, 스크립트의 유효성 및 문법 검사기능을 가지고 있으며, 원격 편집기의 요청이 있을 때에 이에 응답하기 위하여 스크립트 데이터베이스 서버측에서 CGI(Comman Gateway Interface)가 구동된다.

• Journal of Korean Ophthalmic Optics Society
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• v.11 no.4
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• pp.293-298
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• 2006

For this study, Clinical evaluation of the diverse Autorefractors was performed to examine validity and repeatability compared with subjective refraction. Measurements of refractive error were performed on 212 eyes of 106 subjects subjectivly noncycloplegic. Intersession repeatability of the Autorefractors were also assessed on all 106 subjects together with intersession repeatability on 7 to 14 days intervals. Spherical powers of subjective refraction and autorefractions by Autorefractors were analyzed by paired T-test.

• The KIPS Transactions:PartD
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• v.15D no.6
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• pp.803-814
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• 2008

Product line architectures include variable parts to be selected according to product specific requirements. In order to derive architectures that are valid for a particular product from product line architectures, variabilities of product line architectures must be systematically managed. In this paper, we adopt an approach to variability management of product line architectures through an explicit mapping between a feature model and product line architecture models. If this mapping is incorrect or there exists inconsistency among product line architectural elements, variabilities of product line architectures cannot be managed correctly. Therefore, this paper formally defines product line architectural models in terms of conceptual, process, deployment, and module views, and mapping relationships between the feature model and the architectural models. Consistency rules for correct variability management of product line architectures are defined in terms of consistency in each of product line architecture model, consistency between different architectural view models, and consistency between a feature model and product line architectural models. These consistency rules provide a theoretical foundation for deriving valid product architecture from product line architectures.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.32 no.3
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• pp.256-260
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• 1999

Minimun-detectable levels to 28 antibacterial agents used for the prevention and the treatment of fish diseases were determined to establish optimal detective method of bioassay in fish by the EEC 4-plate method, the modified method of EEC 4-plate and the standard method of analysis in food safety regulation. The test organisms used in the methods of bioassay were as follows: Bacillus subtilis BGA (B. subtilis) and Micrococcus luteus ATCC 9341 (M. luteus) in the EEC 4-plate method, B. subtilis, M. luteus and Bacillus cereus var. mycoides ATCC 11778 (B. cereus) in the modified of EEC 4-plate, and B. subtilis, M. luteus, B. cereus and Bacillus stearothermophilis var. calidolactis C-953 (B. stearothermophilis) in the standard method. The standard method showed predominant sensitivity in the detection of penicillins (PCs), and was also highly sensitive to aminoglycosides (AGs). The sensitivity of standard method in the detection of tetracyclines (TCs), marrolides (MLs), nitrofuran derivatives(NFs) and quinolones (QNs) was very low, and against sulfonamides (SAs), however, was extremely low. The modified method of EEC 4-plate showed very high sensitivity to TCs. Both the EEC 4-plate and the modified method of EEC 4-plate showed competitively high sensitivity in the detection of PCs, MLs, NFs, QNs and SAs. All the methods studied in the experiment showed very low sensitivity against chloramphenicol (CMs). Consequently, the modified method of EEC 4-Plate was the best bioassay method with a wide range of sensitivity for the optimal detection of the residual antibacterial agents in fish.

• Journal of Korea Game Society
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• v.13 no.3
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• pp.85-94
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• 2013

In this paper, we propose a scheme to reduce the number of shadow tests conducted during rendering of ray tracing. The shadow test is a very important process in ray tracing to generate photo-realistic images. In the rendering phase, the ray tracer determines whether to cull the shadow test based on information calculated from a shadow test conducted on the kd-tree in the preprocessing phase. In conventional rendering process, the proposed method can be used with little modification. The proposed method is suitable for a static scene, in which the geometry and light source does not change in the same manner as it does in the conventional method. The validity of the proposed scheme is verified and its performance is evaluated during cycle-accurate simulation. Through experiment results, we found that we could reduce up to 17% of the shadow test.

• Journal of rehabilitation welfare engineering & assistive technology
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• v.11 no.4
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• pp.339-348
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• 2017

The purpose of this study was to verify the validity and reliability of the computerized general neurocognitive test using intuitive evaluation techniques to reflect the needs of the elderly and to validate neurocognitive function appropriately. The subjects were 100 elderly people who were over 60 healthy people. To evaluate the comprehensive neurocognitive function of the elderly, Computerized Neuro-cognitive Function Test (CNT, cybermedic. Co., Korea) developed by CyberMedic was used. The test consist of attention test, memory test and the problem solving ability test. As a result of correlation analysis of CNT test items, it was possible to confirm the characteristics of measuring single domain of attention and memory test. The problem-solving ability test also showed a high level of significant correlation, although the purpose of measurement was different, but a comprehensive cognitive function test for problem solving was possible. In the reliability analysis, the half reliability and internal consistency of test - retest were significantly higher. As a result of the above study, we conclude that the comprehensive neurocognitive test items constituted in this study have achieved reproducibility and effectiveness.

• 한국벤처창업학회:학술대회논문집
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• 2006.11a
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• pp.415-443
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• 2006

This empirical study focused on examining the relationship between transactional transformational leadership style and power of construction project manager and the organizational effectiveness, respectively, and the moderating role of power between leadership and the organizational effectiveness. A 790 numbers useful questionnaires were obtained from the stuffs working at the construction sites excluding project managers. Internal consistency test using Cronbach's ${\alpha}$ and confirmatory factor analysis were conducted for the reliability and validity of the scales respectively. And cluster analysis and multivariate analysis of variance (MANOVA) were conducted to test the hypotheses. The results and implications are as follows. First, the leadership styles of project managers influence positively the subordinates' job satisfaction but not organizational commitment in construction project. Second, the power styles of project managers influence positively the subordinates' job satisfaction and organizational commitment. Third, the leadership styles of the project managers influence positively the subordinates' job satisfaction and organizational commitment by the power moderating role. The implication of this result is important because of the fact that the transformational leadership can be useful even in the construction projects. And the moderating role of the project manage's power suggests.

• Proceedings of the Korean Information Science Society Conference
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• 2002.04a
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• pp.907-909
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• 2002

전자 신뢰 매커니즘 기반의 정보사회에서는 기밀성과 인증의 확보가 필수적이며 이를 위해서는 전자서명 기술을 포함하고 있는 공개키 기반의 인증서관리 체계의 확립이 선결되어야 한다. [3] 인증서의 정당성을 검증하기 위해 검증자는 소유자의 인증서와 그 인증서를 인증한 공인인증기관의 인증서를 검증해야 하고, 이전에 인증서 폐지를 확인해야 하며, 실제 공개키 기반구조 환경에서 인증서의 유효성을 검증하기 위해서는 인증서 자체 검사와 함께 최상위 인증기관(루트CA)으로부터 사용자에게 인증서를 발행한 단말CA까지의 인증트리를 검증해야 한다[3]. 본 연구에서는 효율적인 인증서 폐지정보의 검증을 위해 다중 CA환경에 적합한 NPKI상에 B-Tree데이터구조를 적용하는 인증서 폐지 검증 방안을 제안하고자 한다.