• 한국컴퓨터정보학회논문지
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• 제13권1호
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• pp.161-167
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• 2008

해쉬체인을 이용한 사용자의 인증과 무결성 제공방법이 활성화되면서 이를 이용한 인증서 상태검증 방법들이 다양하게 제안되었다. 제안된 방법들 중에 NOVOMODO에서는 CA가 해쉬값을 생성하여 각사용자에게 배포하고 Jianying Zhou의 프레임워크와 양종필의 개선된 프레임워크에서는 사용자가 해쉬값을 생성하여 검증자에게 전달한다. 그러므로 해쉬값의 생성 및 배포를 위한 작업량이 각 사용자에게 분산되어진다. 그러나 이들 프레임워크는 CA가 발행한 인증서에 오류가 없고 CA의 개인키가 노출되지 않는다는 가정을 전제로 하고 있다. CA도 공격자에 의해 언제든지 개인키가 노출될 수 있으므로 이들 프레임워크는 실제 PKI 환경에 적합하지 않다. 따라서 본 논문에서는 사용자의 인증서에 CA가 제어할 수 있는 해쉬값을 추가하여 이를 해결하고자 한다. 추가되는 해쉬값은 8A내의 사용자들에게 동일하며 CA에서 해쉬값을 생성, 저장 및 배포하기 위한 비용이 적다. 그리고 우리는 또한 양종필의 프레임워크에서 서명 및 검증 절차의 문제점을 지적하고 개선 방법을 제안한다. 우리의 제안은 다른 프레임워크들보다 실제 PKI 환경에 적합하다.

• 산경연구논집
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• 제13권4호
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• pp.35-49
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• 2022

Purpose - According to the recently changing consumer smart environment and consumer decision-making process, this study investigates the structural relationship between electronic(online) WOM information characteristics and brand community experience value types on specific brand reliability and brand transformation. In particular, the characteristics of word of mouth information and the experience value of brand community users were divided into detailed fac tors and approached. Methodology - In order to proceed with this study, we review previous studies and setting hypotheses. The hypothesis was verified through a survey that was conducted for the consumers with online consumption activities in less than six months. With reference to previous studies, operational definition was made for the questionnaire design. In order to verify the hypothesis, 282 people were statistically analyzed through the survey This data were used for AMOS for confirm hypothesis established. Results - eWOM information characteristics were classified into usefulness, timeliness and un-bias, and online community experience values were classified into interaction, playfulness, and virtuality. In addition, it is to investigate the relationship between the brand reliability and user's experience value in brad community. The main results are as follows. The first result was that usefulness and un-bias, which are the eWOM information characteristics had a positive effect on forming brand reliability. However, the factor of timeliness did not affect brand reliability. Second, in terms of user experience value and brand reliability in the brand community. It was fo und that experience values such as interaction, playfulness, and vituality all had a positive influence on brand reliability. Third, it was found that brand reliability has a positive influence on the on-line conversion activity of users. Conclusions - Through this study, the field of online consumer behavior research is expanding, and this study suggested that careful management is necessary according to the type or characteristics of eWOM information. Additionally, it presents the importance of the user's empirical value in the brand community influencing brand attitude and reliability. In practice, the implementation of the marketing communication mix in digital marketing has recently been underway to enhance the conversion behavior of users. At this level, it also reveals the preceding factors that increase user conversion behavior.

• 한국의류학회지
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• 제25권1호
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• pp.25-36
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• 2001

The purpose of this study were to investigate the purchase influence of teenagers in the family by examining the evaluation of market value according to their clothing purchase style. The questionaire survey was carried out 572 high school, and middle school students in Seoul region in Feb., 2000. SPSS package program was used to analyze the gathered data. The results of the research were as follows: 1. Four types of family communication patterns were identified through cluster analyses: laissez-faires, protectives, pluralistics, consensuals. 2. Market values were classified into seven dimensions by factor analyses: user value-psychological value, performance value; payer value-payment convenience value, price value; buyer value-personalization value, service value, purchase convenience value. 3. Independent purchase was evaluated higher than joint purchase for the price value and psychological value, while joint purchase marked higher than independent purchase for the performance value, payment convenience value, service value and purchase convenience value. And there were some differences in the results of evaluation among the family communication patterns.

• 한국지능정보시스템학회:학술대회논문집
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• 한국지능정보시스템학회 2007년도 한국지능정보시스템학회
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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.

• ETRI Journal
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• 제36권1호
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• pp.62-68
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• 2014

This paper presents a novel user selection method based on the signal-to-interference-plus-noise ratio (SINR), which is approximated using limited feedback data at the base stations (BSs) of multiple user multiple-input multiple-output (MU-MIMO) systems. In the proposed system, the codebook vector index, the quantization error obtained from the correlation between the measured channel and the codebook vector, and the measured value of the largest singular value are fed back from each user to the BS. The proposed method not only generates precoding vectors that are orthogonal to the precoding vectors of the previously selected users and are highly correlated with the codebook vector of each user but also adopts the quantization error in approximating the SINR, which eventually provides a significantly more accurate SINR than the conventional SINR-based user selection techniques. Computer simulations show that the proposed method enhances the sum rate of the conventional SINR-based methods by at least 2.4 (2.62) bps/Hz when the number of transmit antennas and number of receive antennas per user terminal is 4 and 1(2), respectively, with 100 candidate users and an SNR of 30 dB.

• 한국게임학회 논문지
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• 제14권1호
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• pp.7-18
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• 2014

최근 10년 동안 중국 문화산업의 발전에 따라 중국 온라인 게임 산업은 높은 성장추세를 보여 국민경제의 발전에 큰 기여를 하고 있으며, 또한 세계 게임 산업에서 점하는 비중이 증대되고 있다. 따라서 중국 게임산업 및 게임이용자에 대한 심도 있는 연구가 필요하겠다. 본 연구는 중국 온라인 게임 이용자의 게임이용행위의 특성을 분석하기 위하여 이용자의 인지가치와 충성도를 결정하는 요인에 대한 연구모형을 설정하고, 설문조사를 통해 회수된 자료를 활용하여 AMOS방법을 활용한 실증분석을 하였다. 분석결과를 보면, 인지가치와 충성도에 유의적인 영향을 미치는 변수는 각각 인지가격과 플로우, 플로우와 인지가치로 나타났다.

• 한국정보과학회논문지:정보통신
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• 제29권4호
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• pp.368-374
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• 2002

UMTS와 같은 제 3세대 이동 통신 시스템에서의 value-added 서비스를 위한 중요한 점은 이동 사용자로부터의 지불을 받을 수 있는 지의 여부를 검사하는 것이다. 기존의 value-added 서비스를 위한 인증 및 지불 프로토콜은 사용자의 인증 기관의 역할을 해주는 온-라인(on-line) TTP에 의존하고 있다. 그러나 3 세대 이동 통신 시스템에서의 수많은 서비스 제공자들, 다양한 종류의 서비스들, 그리고 넓은 사용자 계층 등을 고려할 때 온-라인 TTP에 기반한 인증과 지불 기법은 실용적이지 못하다. 본 논문에서는 3 세대 이동 통신 시스템에서의 value-added 서비스를 위하여 티켓(ticket)을 이용하여 인증 및 지불 프로토콜을 제안한다. 제안한 티켓 기반 인증 및 지불 프로토콜은 온-라인 TTP와의 통신 없이 사용자의 비용 지불 여부를 확인할 수 있는 효율적인 방법을 제공한다. 또한 티켓에 기반한 제안된 프로토콜은 이동 사용자의 서비스 사용에 대한 익명성을 보장 할 수 있다.

• 한국정보시스템학회지:정보시스템연구
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• 제32권1호
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• pp.147-178
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• 2023

Purpose The mail goal of this study is to find out factors influencing users' satisfaction of public application with the emphasis of service quality of public web and public value. For this purpose, we applied IS success model to develop the research model that explains users's satisfaction and public performance. Design/methodology/approach The proposed research model was developed based on IS success model along with two moderating effects - Service Quality of Public Web and Public Value in order to empirically test proposed causal relationships withing the model. A total of 377 survey responses were analyzed by forming the structural equation modeling with AMOS 24.0. Findings The analysis results show that the service, information, and system quality from IS success model are positively associated with user satisfaction, which in turn is positively associated with public app performance. The results also show that the relationship between user satisfaction and public app performance is positively moderated by public value. However, the relationship between public app service quality and user satisfaction isn't moderated by public web service quality.

• Journal of Information Technology Applications and Management
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• 제14권3호
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• pp.15-48
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• 2007

As the mobile Internet spreads around the globe, a cross-national difference in the use of mobile services has become an important issue. The goal of this study is to propose and verity cross-national differences in the effect of each value-type on user satisfaction with the mobile Internet. We propose an analytic framework of four different types of value and apply this model to the value structures of mobile Internet users in two different countries. Large-scale online surveys were conducted in Korea and Hong Kong simultaneously with the same questionnaire. Results show that the relationships between the value components and user satisfaction varied between the two countries.

• 한국통신학회논문지
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• 제38B권5호
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• pp.377-384
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• 2013

비밀번호 기반의 사용자 인증은 동일한 비밀번호를 반복 사용하므로 보안이 취약하여 OTP(One-Time Password)가 도입되었다. 하지만 보안이 강화된 OTP를 서버와 동기된 모바일 기기에서 생성하여 PC에 입력하는 경우 PC가 악성코드에 감염되어 있으면 해커가 사용자 계정과 비밀번호 그리고 OTP값을 해킹할 수 있다. 본 논문에서는 OTP값 유출에 따른 보안 취약성을 해소하기 위해 사용자는 계정과 비밀번호를 PC에 입력하여 서버인증을 수행하고, PC 화면에 출력된 QR코드를 모바일 기기에서 스캔하여 OTP값을 직접 서버로 전송함으로써 정보 유출에 따른 해킹을 방지하고 PC에 OTP값을 입력하는 불편함을 줄이는 새로운 이중 인증 방식인 DTOTP를 제안한다. 시스템은 이중 전송을 통해 PC인증 방식의 OTP 보다 향상된 보안성을 제공하면서 기존 OTP 알고리즘을 그대로 사용할 수 있어 구현이 용이하며 은행, 포털 및 게임 서비스 등에 안전하게 활용할 수 있다.