• The Journal of Engineering Geology
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• v.19 no.3
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• pp.401-408
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• 2009

Old national Road No. 59 that connects Danyang and Gagok has 35 dangerous cut slopes. It is relatively narrow and has a poor alignment. The torrential rains in 2002 and 2006 has caused numerous slope collapses, landslides and road settlements in this area. The old road's high risk level lead to the planning and construction of a new national road. During the construction of the new road in December 2006, the right side of Dugcheon Tunnel entrance has collapsed and tension cracks were observed on the district road above the tunnel. In order to determine the cause of failure, intensive field investigation and monitoring cracks were performed together with Lower Hemisphere Projection Analysis, Limit Equilibrium Analysis and Finite Difference Analysis.

• Journal of Korean Society of Steel Construction
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• v.24 no.3
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• pp.257-265
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• 2012

Current trends in steel construction include using tapered, non-compact sections to minimize the use of excess material as much as possible by choosing the cross-sections instead of the classical approach of using prismatic members. In addition, snug conditions, especially the end-plate type, have the advantage of incurring less construction costs and shorter assembly times as opposed to full pre-tensioned conditions. On the other hand, it is important to predict the collapse of the PEB system due to over-loading. Large-scale tests of tapered steel portal frames with non-compact sections were conducted. The primary test parameters included the bolt connection method and the loading condition (vertical and horizontal load). The test results on initial stiffness and load capacity were investigated. Furthermore, comparisons between the analytical and experimental data for load-displacement curves were initiated. In addition, we evaluated the applicability of a snug bolt for the PEB frame in the field.

• Proceedings of the IEEK Conference
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• 2004.08c
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• pp.686-689
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• 2004

Computational grids are emerging as a new infrastructure for internet-based parallel and distributed computing. Grid systems are enables the sharing, exchanging, discovery and aggregation of resources which distributed multiple administrative domains, organizations and enterprises. Accounting information service is one of the main obstacles to widespread adoption of the grid. But, most of grid portals do not support accounting information service. In this paper, we design an accounting information service and build a web-based grid portal including account management service and accounting information service.

• Journal of the Korean Society of Safety
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• v.25 no.3
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• pp.66-70
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• 2010

This paper analyzes difference between current tunnel ventilation calculation method and advanced one which considers effects of polluted air recirculation near tunnel portals. For the calculation, CFD(Computational fluid dynamics) technique was utilized. From the result, it was found that 4.38% more fresh air is required when there is polluted air recirculation near tunnel portal areas. Hence, it is recommanded that the consideration of polluted air recirculation should be made when deciding the ventilation requirements for tunnel.

• Proceedings of the Korea Contents Association Conference
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• 2011.05a
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• pp.493-494
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• 2011

국내에서의 NTIS의 높은 인지도와 달리 해외에서 세계 최초의 국가R&D정보 종합포털로서의 NTIS의 인지도는 전무한 현실이다. 한국과학기술정보연구원에서는 2010년도부터 이러한 문제를 인식하여 NTIS 브랜드의 국제화 및 국내 외 홍보강화를 통해 국내 외 협업 공동연구 활성화를 촉진하고 이를 통한 고부가가치 연구성과의 창출 확산을 위하여 NTIS 영문포털 서비스를 개발하여 서비스 중이다. NTIS에서 제공 중인 주요 서비스에 대한 소개, 과제, 연구자 영문이력정보, 및 영문초록 정보 등 다양한 정보를 제공하고 있으며 2011년도에는 EU의 CORDIS, 미국의 NSF등과의 연계체계 구축을 통해 국내 연구자들에게 주요국의 R&D정보를 제공할 예정이다. 본 논문에서는 NTIS 영문포털의 개요 및 향후 발전방향에 대하여 논하고자 한다.

• Proceedings of the Korea Society of Information Technology Applications Conference
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• 2002.11a
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• pp.99-107
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• 2002

정보화 시대에 전자상거래를 통한 이윤창출은 시대의 요구이다. 이러한 시점에서 농산물에 대한 전자상거래 활성화는 가격의 결정권을 통해 생산자가 우위권과 교섭력을 갖게되며, 중간마진을 생략하여 이윤의 폭을 넓힐 수 있다. 하지만, 농산물의 특성상 규격화와 표준화가 필요하고 신선류에 대한 거래는 위협수위가 높다. 그러나, 쌀은 규격화, 표준화, 연중공급 등의 편리성이 있어 성공률이 높다. 특히, 연중수요, 택배의 편리성, 유통 중 마모율 낮아 소비자의 신뢰성을 확보하는데 좋은 조건을 갖추고 있다. 따라서, 본 연구는 쌀을 중심으로 하는 e-Rice 포털 사이트 구축방안을 통해 생산자와 소비자간의 정보공유와 의사결정 채널을 확보할 수 있도록 제시하였다.

• Steel and Composite Structures
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• v.7 no.6
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• pp.421-440
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• 2007

An optimal design method in cooperated with nonlinear inelastic analysis is presented. The proposed nonlinear inelastic method overcomes the difficulties due to incompatibility between the elastic global analysis and the limit state member design in the conventional LRFD method. The genetic algorithm used is a procedure based on Darwinian notions of survival of the fittest, where selection, crossover, and mutation operators are used to look for high performance ones among sections in the database. They are satisfied with the constraint functions and give the lightest weight to the structure. The objective function taken is the total weight of the steel structure and the constraint functions are load-carrying capacity, serviceability, and ductility requirement. Case studies of a planar portal frame, a space two-story frame, and a three-dimensional steel arch bridge are presented.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.05a
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• pp.136-138
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• 2013

In this paper, we investigate on overall trends and movements in e-learning performance at University. And system developed a e-learning platform consisting of smart phone portal, learning management system(LMS), and learning content management system(LCMS). Throughout the experiment, each of the components of the e-learning were implemented.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 2002.11a
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• pp.99-107
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• 2002

정보화 시대에 전자상거래를 통한 이윤창출은 시대의 요구이다. 이러한 시점에서 농산물에 대한 전자상거래 활성화는 가격의 결정권을 통해 생산자가 우위권과 교섭력을 갖게되며, 중간마진을 생략하여 이윤의 폭을 넓힐 수 있다. 하지만, 농산물의 특성상 규격화와 표준화가 필요하고 신선류에 대한 거래는 위협수위가 높다. 그러나, 쌀은 규격화, 표준화, 연중공급 등의 편리성이 있어 성공률이 높다. 특히, 연중수요, 택배의 편리성, 유통 중 마모율 낮아 소비자의 신뢰성을 확보하는데 좋은 조건을 갖추고 있다. 따라서, 본 연구는 쌀을 중심으로 하는 e-Rice 포털 사이트 구축방안을 통해 생산자와 소비자간의 정보공유와 의사결정 채널을 확보할 수 있도록 제시하였다.

• Architectural research
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• v.3 no.1
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• pp.71-80
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• 2001

It is quite difficult to calculate the collapse probability of a system such as statically indeterminate structure that has many possible modes or paths to complete failure and the problem has remained essentially unsolved. A structure is synthesized by several components or elements and its capacity to resist the given loads is a function of the capacity of the individual element. Thus it is reasonable to assess the probability of failure of the system based upon those of its elements. This paper proposes an efficient technique to directly assess the reliability of a complex structural system from the reliabilities of its components or elements. The theory for the calculation of the probability of a structural system is presented. The target requirements of the method and the fundamental assumptions governing the method are clearly stated. A portal frame and two trusses are selected to demonstrate the efficiency of the method by comparing the results obtained from the proposed method to those from the existing methods in the literature.