• International Journal of Contents
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• 제5권3호
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• pp.40-49
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• 2009

While numerous studies have suggested the significance of uncertainty during the process of information-seeking, less research has investigated user uncertainty in the actual search process using a real system. This study investigated user perceptions of uncertainty in the process of the selection of information retrieval system in the real information-seeking process. Considering the role of commercial Web search engines as supplementary tools for traditional bibliographic databases in academic research environments, this study analyzed the selection behavior of scholarly researchers, who use such search tools for their academic study. The researchers were limited to the discipline of science in order to understand user perceptions in this field. The findings revealed various dimensions, types, and incidents of uncertainty. Variations appeared in different incidents of uncertainty relating to the unique characteristics of the subjects' information-seeking context. The identification of three principal origins of uncertainty based on the different types of uncertainty generated implications to improve information systems and services.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제14권1호
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• pp.20-39
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• 2020

This paper considers a downlink multi-carrier cooperative non-orthogonal multiple access (NOMA) transmission, where no direct link exists between the far user and the base station (BS), and the communication between them only relies on the assist of the near user. Firstly, the BS sends a superimposed signal of the far and the near user to the near user, and then the near user adopts simultaneous wireless information and power transfer (SWIPT) to split the received superimposed signal into two portions for energy harvesting and information decoding respectively. Afterwards, the near user forwards the signal of the far user by utilizing the harvested energy. A minimum data is required to ensure the quality of service (QoS) of the far user. We jointly optimize power allocation, subcarrier allocation, time allocation, the power allocation (PA) coefficient and the power splitting (PS) ratio to maximize the number of data bits received at the near user under the energy causality constraint, the minimum data constraint and the transmission power constraint. The block-coordinate descent method and the Lagrange duality method are used to obtain a suboptimal solution of this optimization problem. In the final simulation results, the superiority of the proposed NOMA scheme is confirmed compared with the benchmark NOMA schemes and the orthogonal multiple access (OMA) scheme.

• 한국IT서비스학회지
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• 제9권2호
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• pp.93-105
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• 2010

Enterprise Architecture has become a key tool for transforming business process, data, IT and application resources. The "Efficient Adaptation and Management of Information System Act" was established to support the planning and development of the information system in order for the public sector to adopt Information Technology Architecture (EA) into its organization through the act. Until now, the study of EA has been mainly focused on concepts, methodologies and success factors for the implementation of EA. User involvement, which is one of the critical factors in adopting information systems, has been rarely studied in the field of EA research. The purpose of this study is to identify the effects of user characteristics on user involvement in EA implementation. After discussing intrinsic motivators and situational motivators as predictors of user involvement, a research model were developed and tested using survey data. The results showed that among intrinsic motivators, perceived competence had a strong positive effect on user involvement. Some implications were discussed for implementing and utilizing EA for public agencies.

• 방송공학회논문지
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• 제12권2호
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• pp.71-79
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• 2007

본 연구는 사용자의 경험에 의해 형성된 인지된 정보구조를 TV EPG 시스템에 적용한 것이다. EPG 시스템은 사용자에게 다양한 TV프로그램 시청 기회를 제공하는 반면에 기능 중심의 정보구조는 사용자가 원하는 채널 탐색 시 어려움을 가중시켰다. 이와 같은 이유는 EPG 시스템의 UI가 사용자의 인지된 정보구조와 일치하지 않은 메뉴정조를 제공하고 있기 때문이다. 이에 따라 본 연구에서는 사용자 경험 중심의 방법론 제시하였고, 사용자 중심의 EPG 시스템의 정보구조 설계 방향을 제안하였다. 이와 같은 연구결과는 디지털 TV 전자 프로그램 가이드 설계를 위한 새로운 접근방법론에 기여할 것이다.

• 정보관리연구
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• 제37권3호
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• pp.1-24
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• 2006

전통적으로 정보전문가의 역할이었던 메타데이터 생성은 인터넷이 대중화되고 인터넷상의 정보가 폭증하면서 그 한계에 부딪치게 되었다. 이에 오늘날 정보자료의 가치는 그것을 사용하는 이용자에 달려있다는 인식하에 정보이용자가 메타데이터를 만드는 새로운 정보조직 패러다임이 부상하게 되었다. 본고에서는 이용자 생성 메타데이터에 해당하는 이용자 주석과 이용자 태깅의 개념과 구현사례를 살펴보았다. 그리고 이용자 생성 메타데이터가 디지털도서관 발전에 미치는 영향과 시사점을 논의하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제15권1호
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• pp.1-19
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• 2021

The graph-based tag recommendation algorithm FolkRank can effectively utilize the relationships between three entities, namely users, items and tags, and achieve better tag recommendation performance. However, FolkRank does not consider the internal relationships of user-user, item-item and tag-tag. This leads to the failure of FolkRank to effectively map the tagging behavior which contains user neighbors and item neighbors to a tripartite graph. For item-item relationships, we can dig out items that are very similar to the target item, even though the target item may not have a strong connection to these similar items in the user-item-tag graph of FolkRank. Hence this paper proposes an improved FolkRank algorithm named FolkRank++, which fully considers the user-user and item-item internal relationships in tag recommendation by adding the correlation information between users or items. Based on the traditional FolkRank algorithm, an initial weight is also given to target user and target item's neighbors to supply the user-user and item-item relationships. The above work is mainly completed from two aspects: (1) Finding items similar to target item according to the attribute information, and obtaining similar users of the target user according to the history behavior of the user tagging items. (2) Calculating the weighted degree of items and users to evaluate their importance, then assigning initial weights to similar items and users. Experimental results show that this method has better recommendation performance.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권10호
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• pp.5100-5119
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• 2018

Most of existing privacy-preserving multi-authorities attribute-based encryption schemes (PP-MA-ABE) only considers the privacy of the user identity (ID). However, in many occasions information leakage is caused by the disclosing of his/her some sensitive attributes. In this paper, we propose a collusion-resisting ciphertext-policy PP-MA-ABE (CRPP-MACP-ABE) scheme with hiding both user's ID and attributes in the cloud storage system. We present a method to depict anonymous users and introduce a managerial role denoted by IDM for the management of user's anonymous identity certificate ($AID_{Cred}$). The scheme uses $AID_{Cred}$ to realize privacy-preserving of the user, namely, by verifying which attribute authorities (AAs) obtain the blinded public attribute keys, pseudonyms involved in the $AID_{Cred}$ and then distributes corresponding private keys for the user. We use different pseudonyms of the user to resist the collusion attack launched by viciousAAs. In addition, we utilize IDM to cooperate with multiple authorities in producing consistent private key for the user to avoid the collusion attack launched by vicious users. The proposed CRPP-MACP-ABE scheme is proved secure. Some computation and communication costs in our scheme are finished in preparation phase (i.e. user registration). Compared with the existing schemes, our scheme is more efficient.

• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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• 제16권12호
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• pp.1154-1164
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• 2010

타겟팅 서비스는 다양한 미디어 서비스 환경에서 사용자 프로파일, 선호도 및 사용 내역 등을 기반으로 사용자의 취향에 가장 적합한 서비스를 추천 및 제공함으로써, 서비스의 만족도와 이용량을 향상 시키는 주요한 응용서비스로서 주로 방송분야에서 연구되어 왔다. 타겟팅 서비스는 방송 콘렌츠에서 interstitial 콘텐츠로, 고정형 TV단말에서 모바일 단말로 서비스의 영역이 확대되고 있으며, 단순한 방송 데이터에서 광고 데이터, 쿠폰 및 관련 미디어 콘텐츠 정보 등으로 데이터의 종류가 다양해지고 있다. 본 논문에서는 사용자 정보를 기반으로 기사, 광고 및 방송정보에 대한 타겟팅 데이터 서비스를 설계, 구현하고자 한다. 이를 위해 웹 기반의 미디어 콘텐츠에 적용할 수 있도록 사용자 프로파일, 선호도 및 사용 내역 정보를 기존 TV-Anytime Forum의 사용자 메타데이터 및 OpenSocial의 사용자 정보를 기반으로 새롭게 정의하였다. 또한, 사용자 정보와 콘텐츠 정보간 유사도 및 사용 내역을 기반으로 사용자 선호도 정보 및 행동 패턴 정보를 생성하여 타겟팅 데이터 서비스를 구현하였다. 성능평가를 통해서 제안하는 타겟팅 데이터 서비스 기술이 기존의 방송 서비스뿐만 아니라, 웹 기반의 미디어 콘텐츠에서도 적용 가능 하다는 것을 확인하였다.

• 한국IT서비스학회지
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• 제22권6호
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• pp.55-70
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• 2023

This study conducted a fuzzy set qualitative comparative analysis study on culture and arts information portals to ensure practical and universal use and activation of culture and arts information portals. The capabilities and influence of affordances and system literacy according to user experience regarding accessibility to cultural arts information portals are as follows. First, physical affordances in the culture and arts information portal were key conditions for the culture and arts information portal user experience regarding system accessibility, system understandability, system usability, system usability, and system literacy. Second, the functional affordance of the user experience in the cultural arts information portal was relatively low and unimportant, and when the functional affordance was low, the user's system accessibility, system understanding, system usefulness, system usability, and system literacy were increased. Third, if the user's functional affordance and sensory affordance are low in the culture and arts information portal, the system accessibility, system understanding, system usability, and system literacy of the culture and arts information portal users are increased. Fourth, cultural arts information portals must build an innovative system with a systematic approach appropriate for the user base by linking system literacy capabilities with a focus on physical affordances.

• 정보학연구
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• 제10권4호
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• pp.11-26
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• 2007

EDS is a typical convergence service performing convergence between functions owned by multiple SPs. EDS provides users with the relevant information and the communication by the various personal conditional environment. An alternative terminology for events for net- work related applications is 'triggers'-these are assumed to be included in the present description. Events could be defined as any activities which occur within a service avail ability, signals. Events can be managed, for example, as part of a context-aware application. EDS carry out a procedure for processing user's requested information about mobil network-based entities, such as the combination with various applications, such as a LBS (Location Based Service) and area information. In AS (Application Service) network environments, the user has his customized EDS in the network, the EDS automatically connects the appropriate Terminals consistent with a user profile. EDS can also send the collected information to other requesting users by way of event information and using the procedures of combination with other services. The user can record/retrieve the user-related information to from the information base through EDS.