• The Journal of Korean Institute of Communications and Information Sciences
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• v.40 no.1
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• pp.115-123
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• 2015

As LTE service and smartphone are emerging as the mainstream of mobile communications market, the value and importance of mobile data service has been further increased. MNO(mobile network operator)s already recognized the data service as essential market needs, and have appealed to consumers based on various satisfaction elements of data service such as faster transmission speed, expended data volume provided as default, and introduction of unlimited plan. So, in the smartphone market where has been mature, investigating what service attributes affect users' selection of data service is very meaningful from the perspectives of both the industry and the academic. Under this background, this study explores determinants influencing consumer's choice for mobile data service and analyzes relative importance of the attributes among different type of users. The findings of this study makes us extend our understanding of consumer characteristics and their service needs in data service centric era, and it provides some implications for establishing telecommunications policies and business strategies.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.25 no.10
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• pp.995-1004
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• 2014

Due to the development of spectrum use technology and various services based on radio spectrum, the scarcity of spectrum has been heightened. In this circumstances both the efficiency and fairness of spectrum use need to be raised. Open spectrum access can be a useful approach for both goal. For the open spectrum access the legal institution needs to be reformed to enable it. From the starting point of spectrum use till the end of spectrum use there can be various issues of rights and obligations. So the legal institution for various legal status of spectrum use and establishment and continuous management of DB and fast and respectable dispute resolution mechanism is required.

• Journal of Korean Library and Information Science Society
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• v.50 no.1
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• pp.105-124
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• 2019

This study was to suggest the improvement and the application of KDC 6 for classifying children's books by the literature review and survey. First, it was suggested to shorten the classification numbers by the divisions and subdivisions and to expand the classification numbers by sub-subdivisions according to the library-specific classification policy, using the subject statistics of the children's books held by 20 public libraries affiliated in Seoul Metropolitan Office of Education and representative C libraries. Second, the knowledge picture books and the fairy tales were suggested to be classified according to its subject, and the fairy tales in each country were suggested to be classified by adding sub-subdivisions and genre subdivisions. Third, it was suggested to shelve by collection and location codes that were distinguished by the ages and the reading level for user, to prepare a standard guideline for shelving, and to implement the regular user education about the classification system. This study could contribute to the development of the KDC abridged version for children's books in the future.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.18 no.1
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• pp.117-146
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• 2007

This study analyzes the performance of school library rehabilitation project for the past four years. The project was launched in 2002 as a 5-year project from 2003 to 2007. Based on the analysis, the author suggests some considerations for the second phase of the project. First, librarians are the focal point to manage the library newly built and remodeled at a massive budget of 300 billion Korean won. Second, when developing curriculum employing school libraries, the curriculum should be differentiated by grade. class, textbook and even chapter. Third. the project should demonstrate the positive influence of school libraries on students' academic achievement so that the parents and community leaders voluntarily promote school libraries. Forth, the project should examine diverse users to successfully meet their demand. Fifth, the project should incorporate capacity building in librarian training course. It is also crucial that librarians themselves make visible effort to achieve an expert status before students and fellow teachers.

• Journal of Korean Society of Transportation
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• v.30 no.1
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• pp.135-147
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• 2012

The benefit of traffic information on variable message sign can be divided into two. At the public level, the benefit of ATIS is the travel time saving, which is not only induced from ATIS, but also mixed with that of ATMS. In the economic appraisal of ITS, the benefit of ATIS has so far been regarded as the derived benefit from ATMS. At the user level, the benefit of ATIS is reduced driver uncertainty through the forward traffic status information. User can benefit from the information on VMS and therefore may have the willingness to pay for it. Recently attempt to qualify the value of information on VMS was increased, but there was a danger of distorting or over-estimates of the ATIS benefit because the related studies didn't consider the time-dependent attributes of traffic information and provided the single value. Estimates of the time-varying value should be needed for a rigorous economic appraisal of ATIS. In this study, we varied the value of information on VMS according to peak and non peak trip and verified the hypothesis that time-varying of value was statistically significant.

• Journal of Korea Technology Innovation Society
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• v.16 no.3
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• pp.630-649
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• 2013

Korea Meteorological Administration has promoted the next generation urban and rural smart weather service project. The purpose of this project is to provide the necessary information to urban and rural districts by using the subdivided meteorological information. This study attempts to assess the value of the next generation urban and rural smart weather service project by using contingent valuation method. According to estimating result, annual mean willingness to pay per household for the next generation urban and rural smart weather service project is 2,947 won.

• The Journal of the Korea Contents Association
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• v.7 no.9
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• pp.127-138
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• 2007

Due to the development of internet technology and the steady increase of turnover at B2C market many companies put a lot of work into maintaining a good relationship with internet customers. Particularly, analyzing and understanding specific customer groups are essential for effective CRM and marketing strategy Thus, this paper proposes the method to define the customers of online bookstore into several meaningful groups. Five important factors and factor scores for each respondent are obtained by Factor Analysis. Six groups are classified by Cluster Analysis and Analysis of Variance(ANOVA) is used to verify the difference between each group.

• The KIPS Transactions:PartC
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• v.13C no.6 s.109
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• pp.733-740
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• 2006

Spam Message has been Causing widespread damages on the Internet. One source of the problems is rooted from an anonymously posted message in the bulletin board in Internet communities. This type of the Spam messages tries to advertise products, to harm other's reputation, to deliver religious messages and so on. In this paper we present the Spam message filtering using the Bayesian approach. In order to increase usefulness of the Spam filter in the bulletin board in Internet communities, we made the Spam filter which can divide the Spam message into six categories such as advertisement, pornography, abuse, religion and other. The test conducted against messages posted on the popular web sites.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.16 no.1
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• pp.233-246
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• 2005

The evolution of librarian job is influenced by the change of paradigm in library. in theses days, a "good job" is the job that is sensing the changes and applying them in the field. The research is the comparison between '70s and 80s' and 21st century's tasks as a librarian; the law of library, the standards, the influence of department on library and job analysis. The results; the number of technical services have been reduced while professional information services increased as well as media resources. This is because they are trying to satisfy all kind of users. The librarians are acquiring of digital resources, preserving the resources, preparing on-line access, cooperating with other information centers to adjust the great increase of work in digital library.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.26 no.1
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• pp.391-428
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• 2015

This research aims to seek for activation methods of archive events regarded as one of the ways of recording information service, in order that the national archives which needs to change its role meets various users. In order to reach the goals I have suggested, I have compared the examples of archive events operated at the National Archives and Records Administration (NARA, the United States of America, USA) and The National Arc-hives (TNA, the United Kingdom, UK) to the case of archive events at the National Archives of Korea (NAK). As a result, I have proposed activation methods as follows based on those; subdivision of the detailed subject area, diversification of the programmes types, and connectivity reinforce of archive events.