• 한국통신학회논문지
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• 제34권2A호
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• pp.124-131
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• 2009

Cognitive radio has been proposed to mitigate the spectrum scarcity problem by allowing the secondary users to access the under-utilized frequency bands and opportunistically transmit. Spectrum sensing, as a key technology in cognitive radio, is required to reliably detect the presence of primary users to avoid the harmful interference. However, it would be very hard to reliably detect the presence of primary users due to the channel fading, shadowing. In this paper, we proposed a distributed cooperative spectrum sensing scheme based on conventional DF (decode-and-forward) cooperative diversity protocol. We fist consider the cooperation between two secondary users to illustrate that cooperation among secondary users can obviously increase the detection performance. We then compare the performance of DF based scheme with another conventional AF (amplify-and-forward) protocol based scheme. And it is found that the proposed scheme based on DF has a better detection performance than the one based on AF. After that, we extend the number of cooperative secondary users, and demonstrate that increasing the cooperation number can significantly improve the detection performance.

• 한국실내디자인학회논문집
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• 제17권4호
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• pp.75-83
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• 2008

This study examined the various functions of public libraries, as well as user satisfaction and needs. We targeted 6 public libraries in the Seoul and Gyunggi area. After 280 library users were surveyed, the collected data were analyzed with an SPSS for Win 14.0 statistics program, where we used frequency, percentage, mean, T-test, One-way ANOVA, and Duncan's test. The major findings were as follows: 1) Half of the users used educational functional space, mainly in the 10-20 age group, who used it for educational purposes as a student or to prepare for getting a job. 2) There were gaps between the furniture arrangement and user preference since most libraries used a rigid system while users preferred a more flexible arrangement. 3) Space by space, public library satisfaction levels differed according to the users' gender and age. Satisfaction of the digital information room scored high, especially for users in their forties. Since public library users are diverse and require various functions, library interiors should be planned accordingly in terms of furniture arrangement and interior design. In particular, there was a gap between satisfaction by age groups, so libraries must account for community needs by considering the age group demographics of their surrounding areas.

• 한국문헌정보학회지
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• 제8권
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• pp.103-128
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• 1981

This study has two aims. one is to devide the ideology of reference service into three groups such as conservative, moderative, and progressive theories, and then investigate the validity of each theory as well as any problems to be suggested. The other is to establish appropriate standards of reference service according to the types of libraries and users, based on the analysis of such theories. Each theory has its own merits and demerits. Accordingly, it seems to be difficult to apply uniformly and theory into users who have different types of question and educational levels. And also it is difficult to apply into various libraries which have different aims of establishment, characteristics, and the users of each library. Consequently, it is suggested to set up a norm of reference service according to the types of libraries and users respectively. The conservative theory is applicable to small and medium sized public libraries, school libraries, and college and university libraries of which the users are mainly students and citizens. The progressive theory is desirable for special and academic libraries as well as large public libraries where the users are mainly specialists. and scholars.

• 품질경영학회지
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• 제46권4호
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• pp.923-938
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• 2018

Purpose: O2O service are becoming popular in various industries such as food delivery and taxi. This research explores how users' motivation of O2O service influence customer loyalty through expectation-confirmation and satisfaction. this study attempts to explore the motivation factor (i.e. pricing, enjoyment, immediately, social influence) and to empirically examine the relationships between those and users' loyalty to O2O service. Methods: To test the proposed research model, a survey research methodology was used. Paper survey was distributed to O2O service users in Korea. A total of 198 data were used for the analysis. Structural equation modeling was used to test hypotheses. Results: According to our findings, this study found that satisfaction was positively influenced by users' motivation factors. all hypotheses about the effect of motivation on expectation-confirmation were statistically not significant. Conclusion: O2O service providers should consider the results of this study to satisfy users' expectations and satisfaction for building a better O2O market.

• 한국비블리아학회지
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• 제26권4호
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• pp.31-63
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• 2015

본 연구는 학교도서관 이용자 프라이버시에 대한 인식조사를 기반으로, 학교도서관 이용자의 개인정보보호 필요성을 제기하여 학교도서관 이용자 프라이버시에 대한 인식을 제고하는데 있다. 이를 위해 학생 프라이버시와 관련된 선행연구, 국내외 학생들의 프라이버시 보호를 위한 법적 근거 및 국내외 학생들의 개인정보보호 침해 유형 조사와 학생 프라이버시에 대한 인식을 조사하였다. 연구 결과, 첫째, 학교도서관 이용자 프라이버시에 대한 인식이 낮게 나타났으며, 학교도서관 이용자 프라이버시 침해 사례의 인식, 프라이버시 보호에 대한 인식, 이용자 프라이버시 문제에 대한 심각성, 이용자들의 프라이버시를 침해할 수 있는 요인들에 대해 낮은 인식을 보였다. 둘째, 학교도서관을 이용하는 이용자들의 도서관 기록이 외부로 유출되었을 때 느끼는 심각성에 대해서는 41.6%의 응답자들은 '심각하다'고 하였고, 18.4%는 심각하지 않다고 하였다. 셋째, 제 3자가 도서관 기록 열람을 요청할 경우, 본인의 동의가 필요한지에 대한 인식을 조사한 결과, 68.5%의 응답자가 '필요하다'고 하였고, 10.4%만이 필요하지 않다고 하였다. 넷째, 학교나 외부기관에서 이용자 프라이버시관련 교육을 받은 경험이 있는지에 대해 조사하였으며, 80% 이상의 응답자들이 받은 적이 없다고 하였다.

• 한국언론정보학보
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• 제26권
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• pp.259-289
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• 2004

이 논문은 주류 인터넷 언론과 대안 인터넷 언론의 이용을 이용자 특성, 뉴스사이트에 대한 태도, 뉴스 이용 패턴의 측면에서 비교하였다. 그 결과 이용자집단간에 정치관심과 정치성향이 차이가 있었으며, 중복 이용자집단이 정치관심이 가장 높고 정치성향도 가장 진보적이었다. 뉴스사이트에 대한 태도 역시 이용자집단간에 유의미한 차이가 있었는데, <조선닷컴>에 대한 신뢰도와 관여도는 <조선닷컴> 순수 이용자집단이 가장 높았고, <오마이뉴스>에 대한 신뢰도와 관여도는 중복 이용자집단이 가장 높았다. 각 이용자집단별 두 사이트에 대한 태도 비교에서는 <조선닷컴> 순수 이용자 역시 <조선닷컴>보다는 <오마이뉴스>에 대한 신뢰도와 관여도가 더 높았으며, 두 사이트에 대한 태로의 차이는 <오마이뉴스> 순수 이용자집단이 가장 큰 것으로 나타났다. 뉴스 이용 패턴에서는 <오마이뉴스>가 이용자당 평균이용시간, 평균 페이지수, 평균 방문일수 등 이용자 충성도가 더 높은 것으로 나타났으며, 중복 이용자집단은 <조선닷컴>보다 <오마이뉴스>의 이용충성도가 훨씬 높아 <오마이뉴스> 정향성을 보여주었다. 이상의 결과들은 이용자 규모가 작더라도 독특하고 차별화된 콘텐츠를 제공하는 뉴스사이드의 경우 충성스런 이용자집단을 가질 수 있으며, 뉴스사이트 성격에 따라 이용자집단이 분화될 수 있음을 시사한다.

• 한국도서관정보학회지
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• 제9권
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• pp.1-31
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• 1982

A library catalog is most important finding tool to a library collection. This tool should be so designed as to enable users to handle with ease and convenience. Library catalog use study is necessary in order to identify the demands made on the catalog by its actual users and to measure the adequacy with which the catalog is meeting these demands. Many major catalog use surveys were performed by means of questionnaire and interview, but these methods are so difficult and perverse that the results of catalog use studies might often be far from scientific precision. The aim of this paper is to seek the guidelines with which one might assist the catalogers in providing an effective library catalog for their patrons. In order to get the first-hand information an actual survey was undertaken on searching behavior at the catalog of Jeonbug National University Library from November 30 to December 5, 1981 and from May 17 to May 22, 1982. The results of the survey can be summarized as follows: 1. Most of the students (79.77%) use the library. 2. Most of the library patrons (74.52%) use the public catalog as the searching tool to the library collection. 3. 67.85% of the catalog users are interested in searching materials written in Korean, Japanese, and Chinese. 4. 72.86% of the catalog users are interested in searching known items at catalog. 5. In known item searching, 49.44% of the catalog users choose title entry. 6. 20.17% of the catalog users are interested subject searching at the catalog. 7. Reference card is not utilized in searching. 8. For the translated items users want double entries in both vernacular and Korean. 9. At current catalog description, author, title, call number, translator, publisher and joint author are useful entry. Edition, author's date of birth and death, illustrative, size of book and bibliographical notes are not much utilized. 10. 55.39% of the catalog user need systematic guidance on how to use the library catalog and collection.

• 한국정보기술응용학회:학술대회논문집
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• 한국정보기술응용학회 2007년도 춘계학술대회
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• pp.321-349
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• 2007

The objective of this study is to investigate factors influencing trust on internet shopping mall and to examine whether these factors on trust have differences between Korean and Chinese users. Based on the literature reviews, this study employs six factors in two groups of influencing factors, web-site characteristics and individual characteristics as key determinants of trust in internet shopping mall. Analysis of 470 responses (Korean: 320 users, Chinese: 150 users) of survey questionnaire indicates the following: In terms of the relationship between web-site characteristics factors and the trust, the results showed clear differences between Korean and Chinese samples. For the Korean samples, transaction security and interactivity were the only significant influencing factors. For the Chinese samples, perceived reputation and perceived size were the only significant factors. In terms of individual characteristics factors, the influencing factors were found identical for the samples. Both propensity to trust and familiarity were significant factors in both Korean and Chinese samples. Based on the findings, managerial implications are discussed in building user trust in internet shopping mall in Korean and Chinese market.

• Journal of Information Technology Applications and Management
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• 제14권2호
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• pp.71-96
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• 2007

The objectives of this study are to investigate factors influencing trust on internet shopping mall and to examine whether these factors on trust have differences between Korean and Chinese users. Based on the literature reviews, this study employs six factors in two groups of influencing factors, web-site characteristics and individual characteristics as key determinants of trust in internet shopping mall. Analysis of 470 responses(Korean: 320 users, Chinese: 150 users) of survey questionnaire indicates the following: In terms of the relationship between web-site characteristics factors and the trust, the results showed significant differences between Korean and Chinese samples. For the Korean samples, transaction security and interactivity were the only significant influencing factors. For the Chinese samples, perceived reputation and perceived size were the only significant factors. In terms of individual characteristics factors, the influencing factors were found identical for the samples. Both propensity to trust and familarity were significant factors in both Korean and Chinese samples. Based on the findings, managerial implications are discussed in building user trust in internet shopping mall in Korean and Chinese market.

• International Journal of Fuzzy Logic and Intelligent Systems
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• 제15권1호
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• pp.45-52
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• 2015

Although researchers have proposed various recommendation systems, most recommendation approaches are for single users and there are only a small number of recommendation approaches for groups. However, TV programs or movies are most often viewed by groups rather than by single users. Most recommendation approaches for groups assume that single users' profiles are known and that group profiles consist of the single users' profiles. However, because it is difficult to obtain group profiles, researchers have only used synthetic or limited datasets. In this paper, we report on various group recommendation approaches to a real large-scale dataset in a TV domain, and evaluate the various group recommendation approaches. In addition, we provide some guidelines for group recommendation systems, focusing on home group users in a TV domain.