• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2010.05a
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• pp.728-729
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• 2010

Opportunistic spectrum access (OSA) allows unlicensed users to share licensed spectrum in space and time with no or little interference to primary users, with bring new research challenges in MAC design. We propose a cognitive MAC protocol using statistical channel utilization information and selecting appropriate spectrum hole for multi-channel data transmission. The protocol based on the CSMA/CA, exploits statistics of spectrum usage for decision making on channel access.

• The Korean Journal of Archival Studies
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• no.49
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• pp.277-297
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• 2016

Access re-review is a process to reclassify the non-disclosure documents to open accessible documents, and it has to be performed in every five years. However, current procedures of the access re-review in many archives have not been properly working, due to the shortage of the available archivists for providing enough access re-review. Although many difficult situation for the re-review such as enormous amount of re-review documents and lack of archivists, access re-review was included in the administrative evaluation list, of which it makes the re-review for just evaluating process. In this study, the access re-review of Seoul Metropolitan Office of Education, which have performed by external service companies as well as the other institutions' progresses were summarized for improving access re-review process. Although Seoul Metropolitan Office of Education processed 610,000 re-review with 100,000,000 won budget for 4 years, the project has been failed to get more budget support because of the claim for the budget efficiency. The other institutions also could not focus on the actual access re-review. Considering all the points, current access re-review process is clearly required to be improved.

• 한국경영정보학회:학술대회논문집
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• 2007.06a
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• pp.302-309
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• 2007

Web is becoming a necessary element of information acquisition methods for us who live in an information and knowledge-oriented society, as it is today. It is deriving a revolutionary change on various parts of our society, such as education, culture, etc. Also due to epoch-making development and diversification of web-related technologies and content types, the knowledge, technique and complexity of web users also accompanied it. In this research web-related education of schools for the visually handicapped and current situation of web access of such students are seized, their problems related to web access are analyzed, and efficient alternatives for web implementation to solve those problems were suggested. On the other hand, since this research is a survey targeting information and computer related teachers of 12 schools for the visually handicapped within Korea, it has the restriction that it does not include the analysis of current state of charity facilities which are not regular education institutions. Moreover, the content of the survey is composed by considering totally blind students, thus more detailed survey should also be conducted for weak-sighted students as well.

• Journal of The Korean Association of Information Education
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• v.9 no.1
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• pp.27-37
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• 2005

Advances in the wireless Internet have led to the rise of diverse techniques which can access information regardless of time and place. There are many research efforts to identify the various ways to use a cellular phone in our everyday life. However, it has been rarely used in the elementary school. As an attempt to apply the wireless Internet technology to the elementary school, this study is to design and implement a wireless Internet homepage where the parents would be able to have an easy access to the information any place and any time. The characteristics of the wireless Internet homepage are as follows; first, the images were reduced to the minimum and the text-oriented information is mostly used to deliver the key information, considering the small screen and relatively slow transmission rates. Second, by providing a link set up between the wireless homepage and the wired Internet homepage, users can choose the more convenient access tool. Finally, the SMS (Short Message Service) messages could be used for an immediate delivery of information.

• Journal of The Korean Association For Science Education
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• v.22 no.5
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• pp.1082-1102
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• 2002

Most of comparative studies in science teacher education so far have been conducted in terms of teacher education policy, pre- and in-service training system and curriculum, and certificate system. While such superficial information can be readily obtainable, it does not necessarily enable us to make access to reality of science teachers' professional development in respective countries, because practice in professional development among science teachers is deeply embedded into respective socio-cultural environment or climate. In order to get information on reality in science teachers' professional development, alternative approaches of research should be developed. This paper aims at pursuing an alternative way to approach reality of Japanese science teachers' professional development. An email survey of free description method with 29 in-service science teachers with a variety of years of experience in Ibaraki Prefecture, Japan, revealed that Japanese science teachers have developed their expertise through very close daily-based communication with their peer science teachers. At least, within their consciousness, neither formal in-service training programs, nor pre-service training programs have had much stronger effects on their professional development than such non-formal, daily-based, deep, apprenticeship-typed or in some sense, family-typed communication. The results suggest that in order to conduct meaningful comparative studies, we should take much more attention to how to make access to reality of science teachers' professional development.

• The Journal of the Korea Contents Association
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• v.6 no.6
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• pp.64-73
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• 2006

In this paper, I explored the direction of ICT used learning that can improve the access ability of e-learning to activate a neglected class's lifelong education by e-learning. I had a good grasp of a neglected class's actual condition of the access ability of e-learning and presented the direction of basic ICT used learning for the adults that can improve the access ability for the lifelong education by e-learning. According to the result of this research, it was found that the adult learners had a considerable disparity by age group. Therefore, it is desirable that they had to learn ICT used learning with considering the actual condition by age. Teenagers and 20 years of age need to be learned in order of an Internet club, word processor, moving picture and etc. It needs to be teamed for the $30{\sim}40$ age bracket lil order of a chat, an Internet club, searching engines and etc and for the $30{\sim}40$ age bracket in order of a chat, an Internet club and moving picture and etc. And also it needs to induce a neglected class to develope participation abilities for themselves by activating an internet club activity.

• Korean Journal of Community Nutrition
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• v.24 no.5
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• pp.363-373
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• 2019

Objectives: This study examined the effects of dietary education experience (home, school, and mass media) on food consumer information literacy. Methods: The study subjects were 454 adult consumers who answered a structured questionnaire. The questionnaires addressed the subjects' demographics, dietary education experience (home, school, and mass media), and food consumer information literacy. The data were analyzed through frequency analysis, mean, standard deviation, t-test, ANOVA, Pearson's correlation, and multiple regression analysis using SPSS Win 24.0. Results: First, the scores of mass media education experience were 3.41 ± 0.64, which was the highest, and 3.15 ± 0.74 for school education experience, which was the lowest. Second, the level of sub-literacies (task definition, information seeking strategy, location and access, use of information, synthesis, and evaluation) showed scores of 3.20 ± 0.72 ~ 3.47 ± 0.68, which were slightly higher than the median. The synthesis literacy was the highest, as opposed to the information seeking strategy literacy, which was the lowest. The location and access and synthesis literacy were higher in women. Third, a significant positive(+) relationship was observed between all sub-literacies and each of three dietary education experiences (home, school and mass media). According to multiple regression analysis, the major variables influencing the sub-literacies of food consumer information literacy were home education, mass media, and school education in that order. Conclusions: The dietary education experience was the highest through mass media. The factor that showed the highest food consumer information literacy was synthesis. The factors influencing the food consumer information literacy were dietary education experience through home, school, and mass media.

• Journal of Science Education
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• v.45 no.1
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• pp.118-128
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• 2021

In this study, as the viewing characteristics of users of YouTube video content related to science education, 'Inflow and Access' is analyzed to find out the interaction between learners and the system, and 'Reaction and Subscription' to find out the interaction between learners and contents. To this end, the YouTube channel "Elementary Science TV," was selected as the subject of research. The channel is mainly focused on the contents of elementary science textbooks, STEAM, and gifted education. The channel's data of YouTube studio was analyzed. The following results were obtained through data analysis: first, as a result of 'Inflow and Access' analysis, YouTube video content related to science education was most often introduced through external links, and the access device was mainly a computer. Second, as a result of the analysis of 'Reaction and Subscription,' 'like' and commenting performed as a reaction to the video were less than 1% of the number of views. Most users watch without a subscription, and watch for longer when using self-directed. Although this study was analyzed through a limited channel called 'Elementary Science TV,' we were able to discover a little about the users' viewing characteristics of YouTube video contents related to science education. In the future, it is expected that it can be used as a basic material for creating videos related to science education for remote classes, establishing a science education video platform.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.6 no.2
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• pp.498-514
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• 2012

Machine to machine (M2M) communications is the hottest issue in the standardization and industry area, it is also defined as machine-type communication (MTC) in release 10 of the 3rd Generation Partnership Project (3GPP). Recently, most research have focused on congestion control, sensing, computing, and controlling technologies and resource management etc., but there are few studies on security aspects. In this paper, we first introduce the threats that exist in M2M system and corresponding solutions according to 3GPP. In addition, we present several new security issues including group access authentication, multiparty authentication and data authentication, and propose corresponding solutions through modifying existing authentication protocols and cryptographic algorithms, such as group authentication and key agreement protocol used to solve group access authentication of M2M, proxy signature for M2M system to tackle authentication issue among multiple entities and aggregate signature used to resolve security of small data transmission in M2M communications.

• The Journal of Korean Association of Computer Education
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• v.11 no.2
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• pp.45-53
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• 2008

Since people with visual impairments are mostly hard to access the Internet they have been neglected from the information-oriented society. Therefore, the contents which consider the web accessibility to readily access to the web by people with visual impairments are an essential component. In this paper, we developed the contents to improve the web accessibility for people with visual impairments. To provide easy access to the web by people with visual impairments, we analyzed the existing web sites for blind people and considered a concise design, and hierarchical structure. Using the PHP, CSS, and Javascript, the necessary functions for the visually handicapped such as focusing, shortcut key, and text equivalent are implemented. The results which are tested by blind users prove the efficiency of the proposed contents.