• KSII Transactions on Internet and Information Systems (TIIS)
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• 제15권6호
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• pp.2069-2085
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• 2021

A Social Networking Service (SNS) platform provides digital footprints to discover users' interests and track the social diffusion of product adoptions. How to identify a small set of seed users in a SNS who is potential to adopt a new promoting product with high probability, is a key question in social networks. Existing works approached this as a social influence maximization problem. However, these approaches relied heavily on text information for topic modeling and neglected the impact of seed users' relation in the model. To this end, in this paper, we first develop a general product adoption function integrating both users' interest and social influence, where the user interest model relies on historical user behavior and the seed users' evaluations without any text information. Accordingly, we formulate a product adoption maximization problem and prove NP-hardness of this problem. We then design an efficient algorithm to solve this problem. We further devise a method to automatically learn the parameter in the proposed adoption function from users' past behaviors. Finally, experimental results show the soundness of our proposed adoption decision function and the effectiveness of the proposed seed selection method for product adoption maximization.

• Journal of Communications and Networks
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• 제11권2호
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• pp.166-174
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• 2009

In this paper, a distributed power and end-to-end rate control algorithm is proposed in the presence of licensed users. By Lagrangian duality theory, the optimal power and rate control solution is given for the unlicensed users while satisfying the interference temperature limits to licensed users. It is obtained that transmitting with either 0 or the maximum node power is the optimal scheme. The synchronous and asynchronous distributed algorithms are proposed to be implemented at the nodes and links. The convergence of the proposed algorithms are proved. Finally, further discussion on the utility-based fairness is provided for the proposed algorithms. Numerical results show that the proposed algorithm can limit the interference to licensed user under a predefined threshold.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.2131-2136
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• 2003

Since the number of user-requests increases dramatically on the Internet, the servers and networks can be swamped unexpectedly without any prior notice. Therefore, the end-users are waiting or refused for the responses of the contents from the originating servers. To solve this problem, it has been considered that a distributed web caching system efficiently utilizes structural elements of the network. Because a distributed web caching system uses the caches that are close to end-users on the network, it transmits the contents to users faster than the original network system. This paper proposes a simple client-based distributed web caching system(2HRCS) that client can directly perform object allocation and load balancing without an additional DNS for load balancing in CARP (Cache Array Routing Protocol) and GHS (Global Hosting System) that are the recent distributed web caching system protocol. The proposed system reduces the cost of setup and operation by removing DNS that needs to balance the load in the existing system. The system has clients with consistent hashing method, so it extends its environment to other distributed web caching system that has caches of different capacity. A distributed web caching system is composed and tested to evaluate the performance. As a result, it shows superior performance to consistent hashing system. Because this system can keep performance of the existing system and reduce costs, it has the advantage of constructing medium or small scale CDN (Contents Delivery Network).

• Asian Pacific Journal of Cancer Prevention
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• 제13권2호
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• pp.533-538
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• 2012

Background: Tobacco cessation would provide the most immediate benefits of tobacco control to prevent tobacco related disease morbidity and mortality. Methods: A tobacco cessation program involving individual and group behavior therapy was implemented in three stages at a worksite. Tobacco quit rates were assessed at the end of each contact session. Results: Out of the 291 tobacco users identified, 224 participated in the tobacco cessation interventions. At the end of three interventions, 38 (17%) users had successfully quit tobacco use. Presence of clinical oral pre-cancer lesion was found to be associated with quitting (p=0.02). Also tobacco users with oral pre-cancer lesions were around three times more likely to quit than those with no lesions (OR= 2.70 95% C.I= 1.20 - 6.05). Conclusion: Cost effective multi-pronged tobacco cessation approaches, inbuilt into other occupational health and welfare activities, are acceptable and feasible to achieve long term sustainable tobacco cessation programs at worksites.

• 인터넷정보학회논문지
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• 제2권5호
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• pp.21-29
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• 2001

본 논문에서는 웹 프로그래밍 기술이 없이도 일반 사용자가 웹 데이터베이스 구축과 함께 멀티미디어 홈페이지를 작성하도록 해주는 시스템(웹삐에로) 개발을 기술한다. 본 시스템은 페이지 에디터, 웹 데이터베이스를 자동 구축해주는 데이터베이스 마법사와, 웹 데이터베이스의 생성 및 수정을 지원하는 데이터베이스 관리자로 구성되어 있다. 데이터베이스 마법사는 홈페이지 템플릿과 연동되는 데이터베이스를 자동으로 생성하고 로컬 사용자 영역에 서버를 자동적으로 구축하는 기능을 갖는다. 페이지 에디터는 DHTML(Dynamic Hypertext Markup Language) 컴포넌트를 기반으로 구현되었으며 멀티미디어 홈페이지를 대화형으로 쉽게 제작할 수 있게 한다. 데이터베이스 관리자는 웹 데이터베이스를 생성, 수정 및 유지 보수하는 기능을 제공한다. 본 시스템은 웹 데이터베이스 프로그래밍 기술이 없이도 웹 데이터베이스와 연동되는 홈페이지 작성을 쉽게 구축하도록 하는 특징을 갖는다.

• 대한인간공학회지
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• 제34권5호
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• pp.531-540
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• 2015

Objective: The objective of this research is to investigate the fundamentals of human computer interaction for wearable computers and derive technology requirements. Background: A wearable computer can be worn anytime with the support of unrestricted communications and a variety of services which provide maximum capability of information use. Key challenges in developing such wearable computers are the level of comfort that users do not feel what they wear, and easy and intuitive user interface. The research presented in this paper examines user interfaces for wearable computers. Method: In this research, we have classified the wearable user interface technologies and analyzed the advantages and disadvantages from the user's point of view. Based on this analysis, we issued a user interface technology to conduct research and development for commercialization. Results: Technology requirements are drawn to make wearable computers commercialized. Conclusion: The user interface technology for wearable system must start from the understanding of the ergonomic aspects of the end user, because users wear the system on their body. Developers do not try to develop a state-of-the-art technology without the requirement analysis of the end users. If people do not use the technology, it can't survive in the market. Currently, there is no dominant wearable user interface in the world. So, this area might try a new challenge for the technology beyond the traditional interface paradigm through various approaches and attempts. Application: The findings in this study are expected to be used for designing user interface for wearable systems, such as digital clothes and fashion apparel.

• International Journal of Knowledge Content Development & Technology
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• 제9권4호
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• pp.69-93
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• 2019

The purpose of this study is to investigate the status of specialized services and the overall satisfaction of the operation of the specialized services for the librarians and users of the specialized libraries, and based on the ISA method, compare the specialized theme data, specialized service place, specialized program, specialized theme area facilities and environment, and derive issues of the specialized library operation and improvement measures. Consequently, first, when developing the program, the specialized library needs to develop programs in possession of unique characteristics specific to the areas of the differentiated themes from the cultural and educational programs run by the existing libraries. Second, it is necessary to focus on the specialized theme area information services for the users, and to this end, it is necessary to improve librarians 'professionalism. Third, it is necessary to secure the budget for the specialized services and secure space. Since the scope of the services which may be provided as per the budget intended for providing specialized services may be limited, it would be necessary to secure and operate the budget systematic to this end. Fourth, the specialized library needs to proceed with activities in connection with local residents for the purposes of facilitating specialized services.

• 정보관리연구
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• 제43권2호
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• pp.85-101
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• 2012

이용자 관점에서 대학 기관리포지터리는 다양한 정보시스템과 서비스 중의 하나이기 때문에 이용자 측면의 인지와 이용행태에 관한 연구는 대학 기관리포지터리의 발전에 있어서 중요하다. 따라서 본 연구는 국내 대학 기관리포지터리 이용자(end-user)의 이용행태를 밝히고 이를 통해 대학 기관리포지터리 개선 방안을 제시하고자 하였다. 이를 위해 국내 대학 중 자체적인 대학 기관리포지터리 시스템을 운영하는 3기관(KOASAS, S-Space, DSpace@INHA)을 선정하였다. 이들 세 기관의 이용자를 대상으로 대학 기관리포지터리의 이용행태에 관한 설문조사를 실시하였으며, 그 결과를 바탕으로 대학 기관리포지터리에 대한 인지 및 접근성과 검색 및 이용에 관한 측면에서 개선 방안을 제시하였다. 이러한 연구결과는 대학 기관리포지터리에 대한 인지 제고와 함께 이용자의 적극적인 이용을 도모하는데 있어서 실제적인 지침의 역할을 할 수 있을 것으로 기대한다.

• 한국문헌정보학회지
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• 제38권4호
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• pp.49-65
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• 2004

대학도서관 이용자들은 도서관 홈페이지 게시판을 통하여 도서관에 대한 그들의 요구나 불만사항을 전달하는 것이 일반화 되어있다. 본 연구는 게시판에 나타난 이용자 요구 및 불만사항을 조사, 분석하였다. 조사대상으로는 12개의 국내 대학도서관과 3개의 외국 대학도서관을 선정하였으며 연구의 결과는 이용자 요구사항을 제도적으로 반영할 수 있는 개선책 마련에 도움이 될 것이다.

• 한국컴퓨터산업학회논문지
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• 제2권2호
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• pp.259-264
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• 2001

본 연구는 에이전트를 이용한 전자상거래의 효과적 활용방안에 관한 연구를 하는데 그 목적이 있다. 최근 전자상거래에 관한 연구는 급속히 확산된 정보시스템의 환경적 활용방안에 관하여 충분히 반영하지 못하고 있는 한계성을 가지고 있다. 이는 정보산업의 발달로 따라 연구의 대상도 세분화하여야 할 필요가 제기 되었기 때문이다. 본 연구에서는 이러한 요인을 감안하여 연구한 결과 전자상거래의 효과적인 활용을 위한 기술적 요인, 사회적요인 및 비즈니스능력을 중요요인으로 제시하였다.