• Journal of the Korean Society for information Management
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• v.25 no.4
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• pp.185-204
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• 2008

The Internet is now an integral part of the everyday lives of a majority of people. Web users are demanding web sites that offer credible information. This study tired to comprehensively extract the factors that affect the perception web credibility based on preceding researches and develop of indicators for evaluating the web credibility by goodness-fit analysis. I modified more than 100 factors which presented by preceding researches to 28 factors, and allocated these factors into the hierarchical categories like followings; trustworthiness, expertness, safety are categorized as first level factors, trustfulness and reputation are placed to sub-factors of trustworthiness, usefulness, timeliness and competency to sub-factors of expertness, security and reliability to sub-factors of safety as second level factors. Finally this study developed evaluating indicators for web credibility by goodness-of fit analysis.

• Journal of the Society of Disaster Information
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• v.9 no.3
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• pp.332-338
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• 2013

Recently in Korea, in order to ensure evacuation safety within buildings, reviewing and evacuation assessment using computer simulations has been performed from the planning and design stages. Since the results from the assessment mainly depends on the initial values of input elements, it is important to establish element specific data. Nevertheless evacuation related experiments and research are still insufficient to apply overseas standards to domestic conditions. This study intended to conduct a experiment on evacuation movement speed by age as part of element-specific data construction for domestic occupant movement speed. After analyzing domestic and overseas studies on evacuation movement speed, we conducted the experiment of evacuation movement speed for 134 people. Then, by carrying out a comparative analysis of the results of the movement speed obtained from the experiment with overseas movement speeds, we followed the validation procedures of the experimental results under domestic evacuation conditions. The data derived from the experiment is expected to serve as a basis for the movement speed of domestic evacuation safety assessment.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2008.11a
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• pp.165-172
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• 2008

Leakage incidents due to the fault of hazmat tank foundations are likely to cause the tremendous fire disaster in the national industry cluster area. The proper design and construction of tank foundation should be required to prevent the tank fire. In the study, the types of typical tank foundations were classified and modeling the individual tank type for 3D FEM analysis was performed to suggest the guideline for the design and construction of tank foundations. Matters to be attended of the foundation design and construction are reviewed through the comparison assessment of the numerical analysis results of the foundation types.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04c
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• pp.46-48
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• 2003

정보화 사회로의 급속한 전환으로 인해 고품질 소프트웨어에 대한 관심과 요구가 증대되었다. 따라서 양질의 소프트웨어를 확보하여 시스템의 안정성과 신뢰성을 높이 위해서는 개발활동의 전 단계에서 품질 보증 활동 및 평가가 이루어져야 한다. 개발 초기에는 프로젝트의 특성과 품질요구사항을 철저히 파악하여 품질목표를 설정하고 개발단계에서는 품질목표의 충족여부를 면밀히 점검하여야 한다. 본 논문에서는 소프트웨어 품질 평가의 기준이 되는 ISO 9126을 기반으로 소프트웨어 개발 전 단계에대한 품질특성의 상관관계와 가중치를 설정하고, 정량화된 품질평가 모텔을 제안하여 소프트웨어 개발의 성공에 실질적으로 지원할 수 있는 평가기준 정립 및 표준화를 위한 기초로 활용할 수 있다.

• Proceedings of the Korean Society of Coastal and Ocean Engineers Conference
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• 1995.10a
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• pp.113-116
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• 1995

연안 생태환경의 창조, 복원 및 개량을 위한 생태계제어 기술의 개발이 요망되고 있으며, 이를 이용한 연안역의 고도이용이 강조되고 있다. 이는 어장·어항·어촌의 개발 및 관리에 대한 장기적이며 상호보완적인 계획을 기초로 한 체계적인 조사, 계획, 실시 및 평가 체제의 정립을 통해 최적화할 수 있다. 이를 위해서는 지속가능한 연안역(자원)의 이용을 위한 연안역 개발 개념 및 방향(김, 1995)과 요소시설물의 설계개념(Ryu and Kim, 1995) 등의 체계화와 각종 요소 시설물의 설계·배치기술의 개발이 요망되고 있다. (중략)

• Proceedings of the Korea Water Resources Association Conference
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• 2022.05a
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• pp.376-376
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• 2022

전 세계적으로 홍수의 발생빈도가 증가함에 따라, 하천 내 홍수피해를 경감하기 위해 설치하는 하천시설에 대한 중요성이 강조되고 있다. 하천시설은 홍수조절, 이수를 위한 흐름의 제어와 유도, 자연환경의 유지 및 개선 등 중요한 역할을 하고 있으나, 구조적으로 물과의 접촉이 많아 물리적 손상이나 노후화가 매우 빠르게 진행되는 특성이 있다. 시설물의 노후화가 지속될수록 안정성을 보장하기 어려워 자연재난의 규모를 증가시킬 위험성이 있다. 하천시설의 선제적 유지관리를 위해, 본 연구에서는 시설물통합정보관리시스템(Facilty Management System; FMS)의 정밀안전진단 결과를 활용하여 시설물의 사용연수에 따른 성능지표의 변화를 기반으로 회귀식 형태의 성능평가모델을 개발하였다. 기존연구와의 비교를 통해 성능평가모델의 적합성을 확인하였으며, 개발한 성능평가모델은 하천시설의 생애주기를 통합적으로 고려함으로써 정량적인 상태를 예측할 수 있다는 장점이 있다. 본 연구에서 제안된 성능평가모델 결과는 하천시설의 생애주기 관리를 위한 기초자료로 활용 가능할 것으로 기대된다.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.29 no.2
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• pp.77-82
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• 2017

Recently, the possibility of abnormal waves of which height is greater than design wave height have been increased due to the climate change, and therefore it has been urgent to secure the stability for harbor structures. As a countermeasure for improving the stability of conventional caisson breakwaters, a method has been proposed in which adjacent caissons are interlocked with each other to consecutively resist the abnormal wave forces. In order to reflect this research trend, the reduction effect of the maximum wave force resulted from introducing a long caisson has been presented in the revision to the design criteria for ports and fishing harbors and commentary. However, no method has been proposed to evaluate the stability of interlocking caisson breakwater. In this study, we consider the effect of the phase difference of the oblique incidence of the wave based on the linear wave theory and apply the Goda pressure formula for considering design wave pressure distribution in the vertical direction. Sliding stability assessment formula of an interlocking caisson breakwater is proposed for regular, irregular, and multi-directional irregular wave conditions.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.4
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• pp.2006-2012
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• 2013

This case study deal with the investigation of various causes and analyses concerning the cases of the collapse of reinforced segmental retaining walls installed for newly constructing a peripheral road within the campus of ${\bigcirc}{\bigcirc}$ University located in Gyeonggi-do. As results of stability analyses and reviewing of design documents concerning collapsed reinforced segmental retaining walls, such a collapse appeared because of problems related to construction including poor-compacted backfill, the omission of the investigation on the bearing capacity, the length and space in the installation of reinforced materials, and drainage systems. Also, problems during diverse types of designing were confirmed involving the stability analysis of the entire slope stability to be considered during designing and failure in application of the proposed methods of FHWA or NCMA which are generally used for two-tier reinforced segmental retaining walls. In addition, based on these details of the stability assessment, the study proposed reinforcement solutions and construction methods for stabilizing reinforced segmental retaining walls to be reconstructed in the future.

• Journal of rehabilitation welfare engineering & assistive technology
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• v.10 no.2
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• pp.133-139
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• 2016

An electric wheelchair is a assistive device to maneuver on the ground. Tip-over of an electric wheelchair is increasing every year. Dynamic stability metric test item in KS P 7176 has not ensured safety of electric wheelchair on the slope. This study presents design the foldable electric wheelchair that can load in the car and analysis of tip-over measurement which is easily computed for electric wheelchair. Wheelchair frame is designed with a four-bar link mechanism for a foldable structure, and seat module, battery and power driving module can be separated. This analysis is performed during a maneuver on the ground by force-moment stability metric. Several elements, center of gravity position, rotational radius and acceleration, were evaluated how to affect stability metric. This stability metric can reduce tip-over of wheelchair and provide a clue to make of dynamic stability test item.

• Journal of Korean Society of Steel Construction
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• v.10 no.4 s.37
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• pp.801-811
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• 1998

In this paper, aerodynamic properties and improvements of the ${\pi}-shaped$ stiffening girder is studied by wind tunnel tests in steel composite cable stayed bridge. As an improvement device, fairing, extension, post and flap is tested. and the best improved section is selected and estimated on angles of attack, damping ratios and turbulent flows. It is shown that the selected fairing is effective to improve the aerodynamic stability. And this study can be utilized as a database of wind-resistant methodology of steel composite cable stayed bridge.