• Bulletin of the Korean Space Science Society
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• 2005.04a
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• pp.129-132
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• 2005

This paper describes BAUSAT-2 orbital thermal analysis and preliminary design of thermal control subsystem. To design thermal control subsystem of HAUSAT-2, we have considered active & passive thermal control method based on basic theory and themal equilibrium equation. Using this result, suitable thermal control method and material have been selected. We have designed thermal control subsystem based on analysis of HAUSAT-2's thermal environments on sun synchronous orbit with altitude 650km, inclination $98^{\circ}$ and thermal distribution and range expectation of each HAUSAT-2's surface. Thermal analysis consists of system level, box level and board level analysis. We have completed system level and box level analysis. Till now, board level analysis of main heat dissipation board in progress. Thermal control subsystem has designed according to thermal analysis result. This design is to maintain all of the HAUSAT-2 components within the allowable temperature limits. In future, STM

• Journal of Internet Computing and Services
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• v.24 no.4
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• pp.137-144
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• 2023

The purpose of this study is to examine consumers' perceptions of domestic infertility support policies based on infertility-related keywords and the trends of their changes. To this end, Momsholic, a mom cafe which has the most active infertility-related bulletin boards on Naver, was selected as the analysis target, and 'infertility' was selected as a keyword for data search. The data was collected for three months. In addition, network analysis and visualization were performed using R for data collection and analysis, and cross-validation was attempted using the NetDraw function of 'textom 1.0' and the UCINET6 program. As a result of the analysis, the main keywords were cost, artificial insemination, in vitro fertilization, freezing, harvest, ovulation, and how much. Next, looking at the central value of the degree of connection, it was found that the degree of connection between the words cost, cost, how much, problem, public health center, and artificial insemination was high. According to the results of this study, women who visit mom cafes due to infertility in Korea are more interested in the cost. It is believed to be closely related to infertility treatment as well as in vitro fertilization and egg freezing. Therefore, by examining keywords related toinfertility, it has academic significance in that it is possible to identify major factors that end users are interested in. Furthermore, it is possible to redefine the guidelines for domestic infertility support policies by presenting infertility support policies that reflect the factors of interest of end consumers.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 2002.11a
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• pp.121-124
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• 2002

In this paper, we present a secure on-line lottery protocol which consists of three entities: the players, the lottery provider and the bank. We utilize blind signature and hash chain technique as basic building blocks. Our protocol faithfully satisfies the general security requirements to deal with electronic transactions in safe. The proposed protocol reduces the number of communications and all transactions are executed through the Internet(On-line). By using bank as a notary and bulletin board managed by the lottery provider, we can easily settle down potential disputes which frequently occur during commercial transactions.

• Journal of Korean Library and Information Science Society
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• v.39 no.3
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• pp.387-404
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• 2008

The purpose of this study is to find out user's information needs in university libraries based on websites. The data were collected from the bulletin board in university libraries websites. To identify the user's information needs, the works in the university libraries including acquisition, cataloging, circulation, digital collection and electronic system were analyzed. The results of the study will be useful for designing and developing the library system.

• The Bulletin of The Korean Astronomical Society
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• v.40 no.1
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• pp.66.2-66.2
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• 2015

In today's age when telecommunications using satellite has become part of our daily lives, one has to be employ preventive measures to avert any possible danger, of which solar activity is the major cause. Coronal mass ejections (CMEs) heading towards the Earth can lead to disturbances in the Earth's magnetosphere, if their magnetic field is oriented southward. Monitoring of solar filaments in this case becomes very very crucial, as their eruption is associated with most of the CMEs. Monitoring of solar filaments in this case becomes very very crucial, as their eruption is associated with most of the CMEs. Also, filaments show activation up to a few hours prior to launch of a CME and thus can provide advance warning. In this study, we present an algorithm for the detection of solar filaments seen in the extreme ultraviolet (EUV) from Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory (SDO). Various morphological operations are employed to identify and extract the filaments. These filaments are then tracked in order to determine their size and location continuously.

• English Language & Literature Teaching
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• v.17 no.3
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• pp.177-194
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• 2011

This study examines the use of discourse markers in cross-cultural communication between EFL learners in an e-learning environment. The study analyzes the use of discourse markers in a corpus of an interactive web with a bulletin board system through which college students of English at Japanese and Korean universities interacted with each other discussing the topics of local and global issues. It compares the use of discourse markers in the learners' corpus to that of a native English speakers' corpus. The results indicate that discourse markers are useful interactional devices to structure and organize discourse. EFL learners are found to display more frequent use of referentially and cognitively functional discourse markers and a relatively rare use of other markers. Native speakers are found to use a wider variety of discourse markers for different functions. Suggestions are made for using computer corpora in understanding EFL learners' language difficulties and helping them become more interactionally competent speakers.

• Journal of Information Technology Applications and Management
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• v.13 no.3
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• pp.181-200
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• 2006

The purpose of this study is to examine factors influencing online product transformation focusing on benefits of online shopping and word of mouth. Generally, it has been known that buying search goods is more proper than experience goods in the online. However benefits of online shopping and word of mouth make product transformation from experience goods to search goods and the product transformation promote the purchase of experience goods online. We developed a conceptual model of online product transformation including benefits of online shopping(e.g. good price and convenience), online word of mouth (e.g. bulletin board and consumer reviews), and consumer characteristics (e.g. innovativeness and Internet usage). Also, we suggest several research propositions on online product transformation. The implications for marketing strategies of experience goods and furher research direction are suggested.

• Journal of the Korean Home Economics Association
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• v.39 no.9
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• pp.1-14
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• 2001

The purpose of this study was to explore the ideas about childrearing represented on the cuber space. The method used for this study is the content analysis and the data are articles on the Hitel bulletin board during 1 year. It is found that these articles dealt with problems of practices in the pregnancy-delivery, nurturing, teaching and interfacing between home and social institutions. Especially these articles put great emphasis on nurturing. For example, there are many articles about caring, development, health and hygiene of child. And from 1st to 6th month, there are many articles about nurturing. After 7th month, many articles about teaching and interfacing between home and social institutions are appeared. So from these results we might conclude that many functions of the home are transmitted to society too early.

• Journal of the Korean Home Economics Association
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• v.41 no.2
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• pp.187-198
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• 2003

The purpose of this study was to explore the ideas about childrearing represented on the cyber space. The method used for this study is the content analysis and the data are articles about child rearing on the Hitel bulletin board during 1 year. It was found that then articles dealt with problems of practices in the teaching, nurturing, interfacing between home and social institutions, and disciplining. Especially these articles put great emphasis on teaching. For example, there are many articles about children's cognitive development. And there are many articles about nurturing. Especially child's emotional care. Many articles about interfacing between home and social institutions are appeared. In early childhood, many child go to nursery center. So from these results, we might conclude that many mothers gave their children emotional care. And they didn't teach their children directly. Instead they bought many educational instrument.

• Journal of the Korean Home Economics Association
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• v.48 no.9
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• pp.113-123
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• 2010

This study describes the beginning and further development of a collection web-based materials for an efficient approach to culinary practice education. A database was created using a five-step process of analysis, design, development, operation and evaluation. The menu for the web-based culinary practice educational materials included cooking basics, the real status of cooking, cooking related knowledge, performance evaluation, a data room and a bulletin board. As at 30 July, 2010, the datadase of educational materials, contained a total of 571 items. These comprised 139 cooking pictures, 33 recipes, 22 cooking videos, 74 cooking animations, 57 collections of basic knowledge, 14 evaluation reports, 21 supplementary textbooks, and 211 sets of other related information. The webbased materials are adequate for culinary education purposes, and their use is expected to be very highly valued.