• Journal of the Korean Geosynthetics Society
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• v.17 no.2
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• pp.33-40
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• 2018

Characteristics of interface friction between cohesionless soils and geotechnical structure surfaces play an important role in the analysis of earth load and resistance on the structure. In general, geotechnical structures are mainly composed of either steel or concrete, and their surface roughnesses with respect to soil particle sizes influence the interface characteristics between soils and the structures. Accurate assessment of the interface friction characteristics between soils and structures is important to ensure the safety of geotechnical structures, such as mechanically stabilized earth walls reinforced with inextensible reinforcements, piles embedded into soils, retaining wall backfilled with soils. In this study, based on the database of high quality interface friction tests between frictional soils and solid surfaces from literature, equation representing peak interface friction angle is proposed. The influential factors of the peak interface friction angle are relative roughness between soil and solid surface, relative density of frictional soil, and residual (constant volume) interface friction angle. Futhermore, for the developed equation of the interface friction angle, its uncertainty was assessed statistically based on Goodness-of-fit test results.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.26 no.6D
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• pp.951-960
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• 2006

Structural pavement analysis considering lateral loads of moving vehicle was carried out in order to simulate passing vehicle loads under various interface conditions. To verify of existing multi-layer elastic analysis of layer interface effect parameters, this study compared outputs by using ABAQUS, a three dimensional finite element program and KENLAYER, multi-layer elastic analysis as vertical load was applied to the surface of asphalt pavements. Pavement performance depending on interface conditions was quantitatively evaluated and fundamental study of layer interface effect parameters was performed in this study. As results of the study, if only vertical loads of moving vehicle is applied, subdivision of either fully bonded or fully unbonded is enough to indicate interface effect parameters. On the other hand, when lateral loads are applied with vertical loads, pavement behavior and performance are greatly changed with respect to layer interface conditions. The thinner thickness of the asphalt layer is and the smaller elastic moduli of the asphalt layer is, the more pavement behavior is influenced by interface conditions. In addition, regression analysis equation analytically computing tensile strain which was considered thicknesses and elastic moduli of the asphalt layer and layer interface effect parameters at the bottom of the asphalt layer was presented using database from numerical analyses on national pavement model sections.

• Proceedings of the Korean Society for Information Management Conference
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• 2002.08a
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• pp.43-50
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• 2002

본 연구의 목적은 객관적으로 측정가능한 이용자 중심의 정보검색시스템의 인터페이스 평가항목과 세부평가지표를 도출하는 데 있다. 이를 위하여, 정보검색시스템의 이용자 요구사항과 인터페이스 요소를 분석하여 상관관계를 밝히고, 인터페이스 평가영역에 포함되는 인터페이스 요소와 이용자 요구사항을 파악한다. 국내외 인터페이스 평가모델을 종합하여 인터페이스 평가영역 및 지표를 도출하고 전문가 집단의 설문조사를 통해 타당성과 신뢰성을 검증한 인터페이스 평가지표를 정립하고자 한다.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 2003.11a
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• pp.1221-1222
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• 2003

본 연구는 Usability 중심의 웹사이트 평가를 위한 프레임워크 모델의 구축을 목표로 한다. 이를 위해 기존에 구축된 웹사이트 평가 방법론을 분석하여 평가 요소 별 중요도를 설정하였다. 비교 분석을 통해 나온 문제점들을 기초로 웹사이트평가를 위한 평가요인(Critical Factor)을 선정하여 새로운 프레임워크 모델 $C^3$ISP(Contents, Community, Commerce, Interface, Security, Performance)를 제시하였다. 향후 연구과제로는 프레임워크의 유용성을 분석하기 위한 Running Test를 실시한다.

• Proceedings of the Korean Information Science Society Conference
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• 1998.10b
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• pp.594-596
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• 1998

소프트웨어 인터페이스의 개발은 반복적인 평가와 수정을 통해서 보다 사용자들에게 편리하도록 향상되어간다. 이러한 인터페이스에 대한 평가는 사용성 요소(Usability factor)들을 기준으로 이루어지는데, 개발되는 시스템과 사용자의 특성에 따라 중요한 사용성 요소는 달라질 수 있으며 새로운 평가 기준이 개발될 수도 있다. 지금까지의 인터페이스 평가 방식은 주관적인 사용자의 만족도를 바탕으로 인터페이스의 적합성을 테스트해왔다. 그러나, 기존의 방법들은 평가결과의 분석과 분석결과를 수정에 반영하는 과정에서 많은 문제점을 가지고 있다. 본 논문에서는 이러한 문제점을 해결하기 위해 사용자가 시스템에 대해 가지는 정신 모형에 기반을 둔 인터페이스 평가 방식을 제안한다.

• Archives of design research
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• v.15 no.1
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• pp.93-100
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• 2002

The University's web library is a form of library that enables to deal with information about searching loaning, returning of books or data housed in it through web. With the advent of the network and multimedia following the entrance to an information-oriented society, we are experiencing a big change in how to communicate and acquire information. Massive multimedia information transmitted by image and moving picture through the network, made it possible to overstep the limit of the physical gap between information suppliers and users. Despite this important role, it is accompanied by problems such as copyright, scarcity of recognition, paralysis of infra, technical matters and reliability which demand development. In this thesis, according to the State University Evaluation Standards, search node and user interface by system used in 20 different universities possessing web-based library sites were compared are analysed. On the basis of this, an experimental user interface for web-based University libraries was produced, and various questionnaires and data leer this produced interface were collected, classified and analyzed. With the application of the results for the work above to the general search system interface of the web-based library, we proposed a new user interface that contains the following functions, such as location and loan condition of books, search frequency and steps for purchasing books inside the web library.

• The Transactions of the Korea Information Processing Society
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• v.4 no.8
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• pp.1948-1960
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• 1997

Quality of a new system is closly related to the quality of components in reuse repository. Quality assessment is essential to construct a reuse library. Definition of quality and method of assessment are totally different in reuse environments. User interface, functionality, performance are main factor in non-reuse development environment. However, reuse environment needs more reusability, extensibility, generality, and maintainability in quality assessment. This paper describes a development of quality assessment tool for multimedia object reuse conponents. Tool gets reuse components described by C++ or IDL, and analyses style, structure, coupling, strength, complexity, understandability, etc. Ultimatly the tool generate quality satisfaction degree for reuse programmers. Quality assessment services are supported in distributed object architecture, CORBA.

• 한국HCI학회:학술대회논문집
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• 2009.02a
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• pp.1064-1068
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• 2009

인지모델(Cognitive Model)에 의한 사용성 평가는 실제 실험에 의한 방법에 비해 시간, 노력, 비용을 절감할 수 있다. 여러 인지모델 중 ACT-R(Adaptive Control of Thought Rational)은 인간의 모든 인지과정을 상세하게 묘사할 수 있어 다른 모델보다 정확히 인간의 과제 수행을 정량적으로 예측할 수 있다. 그러나 ACT-R 모델을 수립하기 위해서는 인간의 지각, 주의, 기억 인출 등의 처리 과정과 행동 선택 및 수행에 필요한 과제 수행 규칙을 매우 상세하게 분석 및 기술해야 하기 때문에, GUI(Graphic User Interface) 환경에서 운용되는 메뉴 인터페이스와 같이 다양한 시각적 정보의 처리가 요구되는 과제에 대한 모델을 수립하는데는 많은 시간과 노력이 요구된다. 이에 본 연구에서는 GUI 환경에서 전문가 수준의 과제 수행을 예측할 수 있는 간략화한 ACT-R 모델 수립 방안을 제안하고, 이를 이용하여 상용 통계 분석 소프트웨어의 과제 수행도를 예측하였다. 그 결과 실제 실험을 통한 측정 결과와 간략화한 ACT-R 모델의 예측 결과가 잘 일치하였으며 본 연구에서 제시한 간략화한 ACTR 모델이 메뉴 인터페이스의 사용성 평가에 효율적으로 적용될 수 있음을 확인하였다.

• Proceedings of the Korea Society of Design Studies Conference
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• 2000.11a
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• pp.126-127
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• 2000

전통적으로 기존의 제품은 정적인 환경에서의 학습과 언어적인지가 주요시되며, 제품 조작 시에도 커뮤니케이션의 많은 부분을 시각적 인터페이스에 주로 의존한다. 그러나 운전시 동적인 환경에서의 제품 Interface는 기존의 사용성 평가와는 달리 운전시의 동적인 상황을 많은 부분에서 고려되어야 한다. (중략)

• Archives of design research
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• v.17 no.2
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• pp.221-230
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• 2004

Existing usability testing method, particularly lab-based usability testing, has been widely implemented for development of user interface. However, the method has critical disadvantages such as high cost, time and effort, unnatural testing environment, and lack of user's direct participation in information architecture. With these backgrounds, this paper aims to develop the web-based participatory tool with particular focus on card sorting. Our tool was developed for allowing user to participate in card sorting with his own computer through web. All the data generated while user is participating in the test are automatically sent to the server, which makes it very easy to collect card sorting data. Users can drag cards of interface elements directly and build the interface structure in their own from their computer-screen so that they can represent their mental models on interface structure of testing website. These functions of our tool can help designers to implement card sorting without tedious and time consuming procedures and improve the method of usability testing by reinforcing user's active participation in building an information architecture.