• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 2001.05a
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• pp.109-113
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• 2001

The purpose of this paper is to propose an analytical method for evaluating user satisfaction of Internet websites using the structural equation model(SEM). This paper is intended to identify critical evaluation factors of user satisfaction for websites to determine criteria for evaluating the websites, and use the criteria to develop a SEM model for quantitatively evaluation of each factors' effects of user satisfaction. The SEM model used 2 variables of usability and good-looks for the evaluation factors of websites user satisfaction and each factors have 4 sub evaluation criteria, 3 portal sites were evaluated to construct the SEM model, and 155 subjects participated the website evaluation using the walk-through and face-to-face survey method. Analysis results showed that the SEM model was statistically significant for all the 3 websites evaluated. Both the usability and good-looks two factors also showed significant effects to user satisfaction of websites and have positive correlation. The user satisfaction was more effected by the usability factor than good-looks, and the simplification and harmonization were the most critical sub-factors of the usability and good-looks.

• Proceedings of the Korea Inteligent Information System Society Conference
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• 2007.05a
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• pp.91-100
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• 2007

Understanding the importance of web accessibility as the solution for digital divide, this study recognizes the problem that existing web accessibility researches have been conducted only by governmental administrative organizations and the accessibility researches of web service that is frequently used in every day life are rare. For the research on the actual condition of web-accessability, this study selected the e-mail service of the representative web-service providers - Daum, Naver, and Empas. Through this evaluation research, this study is intended to present a way to provide convenient and efficient service for those who have been alienated from information. For the accessibility evaluation, the automation evaluation tool "KADO-WAH 2.0" was used. And then, source analysis and manual evaluation using Firefox were conducted to see if 'web contents accessibility guideline 1.0' had been kept.

• Proceedings of the Korea Inteligent Information System Society Conference
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• 2007.05a
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• pp.229-238
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• 2007

This study was intended to point out the limit of existing digital content-centered studies, or approaches from the viewpoint of the supplier and in the aspect of business profit model and find ways to assess the quality of digital content, considering the characteristics of digital content. For this, the study is to apply value innovation strategy to digital content assessment, to analyze the applicability, and to propose a new and practical framework for digital content assessment method. To this end, this study selected the global No. 1 search service provider Google and local portal site Naver search service. The study on assessment factors by value innovation strategy was based on existing literature, while user-value elements in that respect were confined to information quality, interactivity, communication, interactive storytelling, and usability. This study objectified the relation with the value innovation strategic analysis, through qualitative and quantitative analyses on value elements of search service users.

• Earthquakes and Structures
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• v.11 no.4
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• pp.563-582
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• 2016

The failure mechanism and maximum collapse load of masonry structures may change significantly under static and dynamic excitations depending on their internal arrangement and material properties. Hence, it is important to understand correctly the nonlinear behavior of masonry structures in order to adequately assess their safety and propose efficient strengthening measures, especially for historical constructions. The discrete element method (DEM) can play an important role in these studies. This paper discusses possible collapse mechanisms and provides a set of parametric analyses by considering the influence of material properties and cross section morphologies on the out of plane strength of masonry walls. Detailed modeling of masonry structures may affect their mechanical strength and displacement capacity. In particular, the structural behavior of stacked and rubble masonry walls, portal frames, simple combinations of masonry piers and arches, and a real structure is discussed using DEM. It is further demonstrated that this structural analysis tool allows obtaining excellent results in the description of the nonlinear behavior of masonry structures.

• Proceedings of the Korea Contents Association Conference
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• 2010.05a
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• pp.129-131
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• 2010

최근 복합적인 기능을 가지고 있는 스마트폰의 확산으로 모바일 웹 시장이 빠르게 확장되고 있다. 모바일 웹은 데스크탑PC 웹과는 달리 화면이 작고 사용자가 손으로 아이콘을 선택하기 때문에 사용자들이 데스크탑PC 웹에서 사용하던 아이콘을 그대로 모바일 웹에 적용하여 사용하기에 모바일 웹서비스를 위한 GUI디자인의 연구의 필요성이 제기되고 있다. 본 연구에서는 데스크탑PC 웹과 모바일 웹의 아이콘 분석을 위하여 이론적 고찰과 함께 국내 포털사이트 5곳-구글, 네이버, 다음, 야후, 파란-을 대상으로 데스크탑 PC 웹과 모바일 웹의 아이콘을 내용방식과 표현방식으로 비교 분류하였다. 아직 모바일 웹의 아이콘을 데스크탑PC 웹에서 사용하고 있는 아이콘을 그대로 사용하는 포털사이트들이 많았지만 몇몇 포털에서는 모바일 웹 사용자를 고려하여 아이콘을 별도로 제작하는 사례들을 볼 수 있었다. 즉 모바일 웹의 사용성을 높이기 위해서 사용자가 작은 화면에서 아이콘을 보고 선택하는 사용 환경을 고려한 GUI디자인이 필요하다는 것을 알 수 있었다.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2003.05a
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• pp.843-848
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• 2003

의사결정에 관련된 지식을 선별하고 이를 효과적으로 활용하기 위하여 많은 기업들이 지식관리시스템을 도입하여 활용하고 있다. 방대한 지식에서 사용자에게 적합한 지식을 제공하는 지식추천 기능은 지식관리시스템의 주요한 기능 중의 하나이다. 대부분의 시스템들이 사용자에게 직접 관심분야를 입력받고 이 정보를 바탕으로 지식추천을 하고 있으나, 사용자가 과거 지식관리시스템을 활용하면서 보인 관심표명 행동들을 활용한 지능적인 지식 주전 방안에 대한 연구는 미진한 편이다. 본 연구에서는 지식 카테고리 또는 문서 키워드를 활용하여 지식을 추천하는 방안과 사용자의 관심분야를 표현하는 프로파일 생성을 위한 다양한 방안을 설계하고 각 방안들의 지식추천 성과를 비교하였다.

• Geomechanics and Engineering
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• v.15 no.3
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• pp.899-910
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• 2018

Terrace deposits are often encountered in portal areas and tunnels with low overburden. They are challenging to excavate considering their great mechanical and spatial heterogeneity and a very high stiffness contrast within the ground. Terrace deposits are difficult to characterize, considering that samples for laboratory testing are almost unfeasible to obtain, and laboratory tests may not be representative due to scale effects. This paper presents the approach taken for their characterization during the design stage and their posterior validation performed during construction. Lessons learned from several tunnels excavated on terrace deposits on the Bogota-Villavicencio road (central-east Colombia), suggest that based on numerical simulations, laboratory testing and tunnel system behaviour monitoring, an observational approach allows engineers to optimize the excavation and support methods for the encountered ground conditions, resulting in a more economic and safe construction.

• International Commerce and Information Review
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• v.10 no.3
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• pp.101-116
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• 2008

Future e-Trade RFID/USN distribution should satisfy the new needs of reasonable customers such as efficient supply of goods, presentation of information, and communication by developing intermediate and long-term strategies through analysis of industrial conditions and customers' needs. Through preferential application of new technology, knowledge-based e-Trade RFID/USN distribution environment and DB of industrial portal sites should be developed, RFID/USN infra such as Supply Chain Management(SCM) should be expanded, future-oriented knowledge-based services should be developed to prepare specific and realistic plans for proper UT(Ubiquitous Technology). Such change in e-Trade distribution environment should have historical and environmental backgrounds to suggest specific tasks and directions as a conversion of structural concept of engineering and trade theory for new u-Trade. Accordingly, this study is to present all the problems available in RFID/USN distribution, develop an organized and technological estimate model and provide a foundation to apply it efficiently. This study aims to present an interpretational foundation of RFID/USN distribution, rather than technical directions.

• The Journal of Information Systems
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• v.16 no.2
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• pp.51-68
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• 2007

The previous studies regarding the usability evaluation of e-government web sites focused only on deriving affecting factors and variables. They did not find the relationship of usability, user satisfaction and revisiting. The objective of this paper is to find the causal effect how the usability of e-government web sites affect to the user satisfaction and the revisiting attitude. no scope of e-government web sites included the portal site and ie liked web sites. We developed a structural equation model and performed a user test. As a result, a perceived usability affected the revisiting, but it did not intermediate the user satisfaction.

• Journal of the Korean Operations Research and Management Science Society
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• v.33 no.4
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• pp.1-12
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• 2008

The study suggests an answer to the question of what determines category diversification of Internet portals in Korea. First, as external factors, competition intensity and market growth are hypothesized to have influence on the degree of category diversification. Second, an internal factor, user loyalty to portals, is hypothesized to influence negatively category diversification. The study performed empirical analysis based on weekly portal-specific panel data of eighteen internet portals in Korea during the period between 2001 and 2004. The result shows that category diversification increases as competition intensity increases, and that category diversification decreases as user loyalty increases. There was no effect of market-level growth rate on category diversification.