• Proceedings of the ESK Conference
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• 1998.04a
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• pp.173-178
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• 1998

본 연구에서는 국내에서 보급되고있는 전용 PC 통신 소프트웨어 사용자 인터페이스의 사 용편이성을 향상시키기 위한 설계요인을 분석하고자 한다. 사용편이성을 평가하는 척도로서 정차적 복잡도를 이용하였다. 절차적 복잡도를 기술하기 위해 KLM을 이용하였으며, 국내4 대 전용 PC통신 소프트웨어 각각에 대해 분석하였다. 분석결과 국내에 보급되고 있는 전용 PC 통신 소프트웨어는 사용편이성 측면에서 차이가 발견되었다. 이 차이는 PC 통신 소프트웨어 사용자 인터페이스의 설계요인 및 PC통신 서비스를 위한 데이터베이스 설계요인의 차이에서 비롯 되는 것으로 판단된다.

• Nuclear Engineering and Technology
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• v.27 no.1
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• pp.112-120
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• 1995

최적 열수력 안전해석 계산코드의 검증에 이용될 수 있는 열수력 실험데이터, 실험데이터 관련 설명자료, 데이터베이스 운영체계 및 인터페이스 등으로 구성되는 단순화된 열수력 실험 데이터 뱅크 (Simplified Organization of Thermalhydraulic Experiment Databank, SORTED)를 개발하였다. 이를 위하여 USNRC와의 국제 연구 협력을 통해 ENCOUNTER실험데이터를 도입하였고, 이를 기본으로 코드 평가 목적에 적합하도록 단순화된 데이터베이스 운영관리 체제 및 사용자 편이성을 강조하는 인터페이스 등을 개발하였다. 개발된 SORTED의 이용성, 사용자 편이성 등이 검증되었으며, 코드 평가에 적절히 이용될 수 있음을 알 수 있었다.

• Proceedings of the Korea Society for Simulation Conference
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• 2000.04a
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• pp.113-118
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• 2000

웹 사용자의 수가 증가하면서 웹서버에 대한 접속 횟수가 급격히 증가하고 있다. 이것은 망의 부하와 서버의 부하를 증가시켜 웹 사용자가 원하는 정보의 전달을 지연시킨다. 프락시 서버는 이러한 문제를 해결하는 방법으로 서버 파일의 복사본을 클라이언트 가까이 위치시켜 망과 서버의 부하를 감소시킨다. 그러나 웹사용에서 프락시 서버의 도입효과에 대한 구체적인 연구결과가 없으므로 시스템 관리자가 프락시 서버의 도입여부를 결정하기가 힘들다. 본 논문에서는 웹사용 환경에서 프락시 서버의 성능을 평가할 수 있는 모델을 제시하고 시뮬레이션을 통해 이를 분석하고 평가한다.

• The KIPS Transactions:PartB
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• v.19B no.3
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• pp.155-164
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• 2012

This study aims to identify the multidimensional variables and sub-variables and study their relative weight in music recommender systems when maximizing the rating function R. To undertake the task, a optimization formula and variables for a research model were derived from the review of prior works on recommender systems, which were then used to establish the research model for an empirical test. With the research model and the actual log data of real customers obtained from an on line music provider in Korea, multiple regression analysis was conducted to induce the optimal correlation of variables in the multidimensional model. The results showed that the correlation value against the rating function R for Items was highest, followed by Social Relations, Users and Contexts. Among sub-variables, popular music from Social Relations, genre, latest music and favourite artist from Items were high in the correlation with the rating function R. Meantime, the derived multidimensional recommender systems revealed that in a comparative analysis, it outperformed two dimensions(Users, Items) and three dimensions(Users, Items and Contexts, or Users, items and Social Relations) based recommender systems in terms of adjusted $R^2$ and the correlation of all variables against the values of the rating function R.

• Journal of Korean Society of Transportation
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• v.23 no.7 s.85
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• pp.77-86
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• 2005

Level of service(LOS) is a quantify measure describing operational conditions within a traffic stream, generally, in terms of such service measures as speed, travel time, freedom to measures, traffic interruptions, comfort and convenience. The LOS is leveled by highway facilities according to measure of effectiveness(MOE) and then used to evaluate performance capacity. The current evaluation of a urban road is performed by only a aspect of traffic operation without any concepts of safety. Therefore, this paper presents a method for evaluation of risk order for urban road with new MOE, user cost analysis, considering both smooth traffic operation(congestion) and traffic safety(accident). The user coat is included traffic accident cast by traffic safety and traffic congestion cost by traffic operation. First of all, a number of traffic accident and accident rate by highway geometric is inferred from urban road traffic accident prediction model (Poul Greibe(2001)) Secondly, a user cost is inferred as traffic accident cast and traffic congestion cost is putting together. Thirdly, a method for evaluation of a urban road is inferred by user cost analysis. Fourthly a accident rate by segment predict with traffic accidents and data related to the accidents in $1996{\sim}1998$ on 11 urban road segments, Gwang-Ju, predicted accident rate. Traffic accident cost predict using predicted accident rate, and, traffic congestion cost predict using predicted average traffic speed(KHCM). Fifthly, a risk order are presented by predicted user cost at each segment in urban roads. Finally, it si compared and evaluated that LOS of 11 urban road segments, Gwang-Ju, by only a aspect of traffic operation without any concepts of safety and risk order by a method for evaluation of urban road in this paper.

• Journal of Digital Contents Society
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• v.18 no.3
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• pp.535-542
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• 2017

The ubiquitous computing made it happen to easily take cognizance of context, which includes user's location, status, behavior patterns and surrounding places. And it allows providing the catered service, designed to improve the quality and the interaction between the provider and its customers. The personalized recommendation service needs to obtain logical reasoning to interpret the context information based on user's interests. We researched a model that connects to the practical value to users for their daily life; information about restaurants, based on several mobile contexts that conveys the weather, time, day and location information. We also have made various approaches including the accurate rating data review, the equation of Naïve Bayes to infer user's behavior-patterns, and the recommendable places pre-selected by preference predictive algorithm. This paper joins a vibrant conversation to demonstrate the excellence of this approach that may prevail other previous rating method systems.

• Journal of Digital Convergence
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• v.19 no.8
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• pp.301-310
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• 2021

The purpose of the study was to induce meaning of the UX design from users' interview. The study covers interviews from 20 untact finance application users in their twenties in written form. It aims to examine previous studies on UX design and to overcome their shortcomings by categorizing usability qualities focusing on verbs used in the interview. The followings are the result: Usability of UX design can be summarized into Unity, Trust, Persistency, Recognition and Approachability of the information to the 20 users in their twenties. As for the data earned from interviews focusing on verbs, usability included Security, Familiarity, Accessibility, Convenience of Operation and Visibility. Each of the qualities fell into related categories such as Security, Information, Brand and Design. In conclusion, analysis based on verb choices led to better understanding of the user-based experience compared to using objective means in previous studies and can be a suggestion to make up for errors in the former evaluation process.

• The Journal of the Korea Contents Association
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• v.17 no.2
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• pp.404-414
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• 2017

With the development of smartphones and online social networks, users produce a lot of contents and share them with each other. Therefore, users spend time by viewing or receiving the contents they do not want. In order to solve such problems, schemes for recommending useful contents have been actively studied. In this paper, we propose a contents recommendation scheme using collaborative filtering for users on online social networks. The proposed scheme consider a user trust in order to remove user data that lower the accuracy of recommendation. The user trust is derived by analyzing the user activity of online social network. For evaluating the user trust from various points of view, we collect user activities that have not been used in conventional techniques. It is shown through performance evaluation that the proposed scheme outperforms the existing scheme.

• Review of KIISC
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• v.13 no.6
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• pp.25-36
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• 2003

정보보호시스템 평가 인증 제도는 사용자들이 신뢰된 인증제품을 사용할 수 있도록 평가기준의 등급별 요구사항을 근거로 평가하여 정보보호시스템에 구현되어 있는 보안기능의 신뢰성을 보증하는데 있다. 본 연구에서는 정보보호제품의 시험 커버리지 보증을 위한 시험케이스 생성에 관한 연구로서, 평가기준에서 요구되는 시험 커버리지를 분석하고 이를 만족시키기 위한 시험케이스 생성 방법을 제시함으로써 보증성을 향상시키고자 한다.

• Information and Communications Magazine
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• v.11 no.9
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• pp.79-92
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• 1994

음성인식 및 합성 시스템으로 대표되는 음성입출력장치의 개발 및 실용화에 따라 이들의 성능을 객관적으로 평가할 수 있는 방법이 중요하게 되었다. 그러나 국내에서의 이분야에 대한 체계적인 연구는 맞지 않다. 본고에서는 이와 관련한 지금까지의 국내외 연구예들을 검토하고 우리 실정에 맞는 평가법 작성을 위한 방법을 모색하고자 한다. 음성입출력장치의 객관적인 평가방법이 확립되면 연구 개발자는 여러방식의 우열을 객관적으로 파악할 수 있고 신뢰성있는 시스템을 효율적으로 개발할 수 있으며 관련제품의 사용자입장에서는 제품간의 성능비교가 가능하게 될 것이다.