• Steel and Composite Structures
• /
• v.20 no.3
• /
• pp.693-718
• /
• 2016

This paper presents a finite element procedure based on Bridging multi-scale method (BMM) in order to incorporate the effect of local/cross-sectional deformations (e.g., flange local buckling and web crippling) on the global behaviour of thin-walled members made of fibre-reinforced polymer composite laminates. This method allows the application of local shell elements in critical regions of an existing beam-type model. Therefore, it obviates the need for using computationally expensive shell elements in the whole domain of the structure, which is otherwise necessary to capture the effect of the localized behaviour. Consequently, highly accurate analysis results can be achieved with this method by using significantly smaller finite element model, compared to the existing methods. The proposed method can be used for composite polymer laminates with arbitrary fibre orientation directions in different layers of the material, and under various loading conditions. Comparison with full shell-type finite element analysis results are made in order to illustrate the efficiency and accuracy of the proposed technique.

• Nuclear Engineering and Technology
• /
• v.25 no.3
• /
• pp.457-469
• /
• 1993

JEF-1-based 50-group cross section set for fast reactor calculations was generated using NJOY system. The set was then examined by analyzing measured integral quantities such as criticality and central reaction rate ratios for 27 fast critical assemblies. The calculated results using the new set were also compared with those of ENDF/B-IV or-V-based fast set. In general, the JEF-1-based set shows an improvement in predicting measured integral quantities in comparison with the previous set. With a few exceptions, JEF-1 results are comparable to those of ENDF/B-V.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2010.05a
• /
• pp.62-66
• /
• 2010

This study presents velocities of bedload sediment transport in both longitudinal and lateral directions and applied in considering morphological change of straight open channel. The velocities of particle motion have obtained by considering the forces balance acting on particles on the bed between the drag, tangential component of the immersed weight of the particle, and Coulomb's resistive forces. Numerical profiles of particle motion velocities reveals good agreement in comparison between this study and Kovacs and Parker (1994). The evaluated velocities components of particle transport are get used to estimate bedload transport rate in considering morphological change of straight open channel. For the application, numerical solution is applied to laboratory experiment which shows very close solution profiles between this study and observed data of a self-formed straight channel.

• Proceedings of the Korea Concrete Institute Conference
• /
• 2004.11a
• /
• pp.109-112
• /
• 2004

It was found from the previous experimental studies that the long-term deformation of SRC columns was quite different from that of RC columns. A new approach method is needed to quantitatively predict the long-term deformation of SRC columns. In this study, the causes of the difference between the behaviors of RC and SRC columns are investigated and discussed. SRC columns exhibit a time-dependent relative humidity distribution in a cross section differently from that of RC columns due to the presence of a flange, which interferes with the moisture diffusion of concrete. This different relative humidity distribution may reduce the drying shrinkage and the drying creep in comparison with RC columns.

• Journal of the Korean Home Economics Association
• /
• v.37 no.11
• /
• pp.19-32
• /
• 1999

This study analyzed the curricula of fashion related majors at 4-year colleges in the USA, UK, Japan and Hong Kong as well as in Korea and compared the characteristics of the Korean curriculum with those of the four countries. A total of 124 curricula from 103 colleges were collected. Courses were divided into eight categories (including industry and market information; materials; merchandise planning; design; production; distribution and selling; basics; and consumption) representing the production and distribution process of fashion business. There were differences in course offerings among the five countries. Overall, curricula in Korea emphasized design and production (construction) areas and showed not much differentiation among colleges. While industry and market information, merchandise planning, and production (management) areas were emphasized in the USA , differentiation/specialization by major was observed . UK and Hong Kong had well-specialized curricula by major Japan seemed to offer traditional and consumption oriented courses. Based on the findings, some propositions for the Korean fashion curriculum were discussed.

• KDI Journal of Economic Policy
• /
• v.37 no.1
• /
• pp.44-72
• /
• 2015

This study evaluates the economic impact of product innovation by using firm-level data from the Community Innovation Survey conducted in Japan. It accounts for possible technological spillover from innovation activities and examines the extent to which new-to-market product innovations contribute to firm performance. Econometric analysis using a simultaneous equation model reveals that new-to-market product innovation is likely to increase a firm's sales without cannibalizing those of existing products and generate more technological spillover to other firms. Moreover, such innovation is more likely to emerge from firms collaborating with academic institutions. The paper concludes by discussing policy implications of these findings as well as points to the importance of cross-country comparison between Korea and Japan.

• The Transactions of the Korean Institute of Electrical Engineers
• /
• v.45 no.1
• /
• pp.18-23
• /
• 1996

This paper proposes a new levitation scheme for EDS MAGLEV vehicle with AC superconducting magnet(ACSCM). The eddy current and the levitation force are generated at all speed including stand still in this scheme, therefore, the auxiliary wheels on DCSCM can be eliminated. To reduce the ac loss of the magnet, the ACSCM also can be operated as a DCASCM at high speed because levitation force generated by DCSCM is enough at high speed. To prove the effectiveness of the proposed scheme, the repulsive force and power loss versus frequency of ACSCM is calculated. For comparison, characteristics of DCSCM of same cross section versus speed are also given. (author). 6 refs., 9 figs.

• Proceedings of the KSRS Conference
• /
• 2002.10a
• /
• pp.559-564
• /
• 2002

This paper describes a new algorithm named as ray following algorithm which is applied for high-resolution satellite image simulation. The problems of the conventional ray tracing algorithm are pointed out especially when terrain elevations vary abruptly. The proposed algorithm follows the directional ray vector sequentially and thoroughly in order to determine the crossing point of the ray with the terrain surface. This way of sequential height comparison method is regarded as the only way to obtain accurate surface cross-section when a highly variant digital surface model is used. The experimental results show and compare the validities of the conventional and proposed algorithms.

• Proceedings of the Korean Information Science Society Conference
• /
• 2012.06c
• /
• pp.301-303
• /
• 2012

본 논문에서는 알려진 악성코드로부터 악의적인 행위 패턴을 정의하는 방법을 제안하고, 이를 기반으로 변형된 악성코드의 검출 방법을 제안한다. 악의적인 행위 패턴에 대한 정의는 Cross Reference를 기반으로 블록화 한 후 실행코드 블록의 호출 관계에 따른 그래프를 이용하여 정의하였다. 그리고 변형된 악성코드에 대한 검출은 실행코드 내부에서 악의적인 행동 패턴을 찾음으로써 판단한다. 제안된 방법에 대한 실험결과 변형된 악성코드의 검출이 가능함을 확인하였다.

• KCID journal
• /
• v.13 no.1
• /
• pp.39-49
• /
• 2006

Weather station based PET(Potential Evapotrarspiration) analysis has often been inadequate to meet the needs of regional-scale irrigation planning. A map of continuous PET surface would be better a solution for the spatial interpolation considering spatial variations. Using a normal PET data collected at the 54 meteorological stations in Korea, 10-days spatial distribution PET map was created using universal Kriging(UK). These estimation methods were evaluated by both visual assessments of the output maps and the quantitative comparison of error measures that were obtained from the cross validation. The universal Kriging method showed appropriate results in spatial interpolation from weather station based PET to spatial PET with low statistical errors.