• 한국우주과학회:학술대회논문집(한국우주과학회보)
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• 한국우주과학회 2005년도 한국우주과학회보 제14권1호
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• pp.129-132
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• 2005

본 논문에서는 HAUSAT-2의 궤도 열 해석과 열 제어계의 예비설계를 살펴본다. HAUSAT-2의 열 제어계를 설계하기 위해서 우선 열 제어의 기본 이론 및 열 평형 방정식을 바탕으로 능동 및 수동의 각종 열 제어 방법을 고려하여 HAUSAT-2에 적합한 열 제어 방법 및 재질을 선정하였다(Karam 1998). 또한, 예상궤도인 고도 650km, 경사각 $98^{\circ}$의 태양동기궤도에서 HAUSAT-2가 처해지는 열 환경에 대한 분석 및 위성체의 각 면에 가해지는 은도 분포 및 범위를 예측하여 이를 바탕으로 열 제어계를 설계하였다. 열 해석은 기본적으로 시스템레벨의 해석, 부품레벨의 해석, 보드레벨의 해석 차순으로 진행되었으며, 현재 HAUSAT-2의 열 해석은 발열이 비교적 많은 보드의 해석까지 진행된 상태이며, 이러한 열 해석을 통해서 얻은 결과는 요구조건을 만족하지 못하는 부분에 대해 설계 변경 등을 통해서 모든 부품이 허용온도 범위를 유지하도록 HAUSAT-2의 열 제어계를 설계하였다. 향후 구조-열 모델(STM; Structure & Thermal Model)을 제작한 후 열 진공시험을 통해 열 해석 결과에 대한 검증을 수행할 것이다.

• 인터넷정보학회논문지
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• 제24권4호
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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.

• 한국정보보호학회:학술대회논문집
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• 한국정보보호학회 2002년도 종합학술발표회논문집
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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.

• 한국도서관정보학회지
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• 제39권3호
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• pp.387-404
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• 2008

대학도서관 이용자의 정보요구를 파악하기 위하여 15개 대학도서관의 웹사이트 게시판에 올라온 이용자의 불만사항, 건의사항, 요구사항을 분석하였다. 정보요구를 희망도서, 대출 및 반납, 정리과정 오류, 디지털자료, 전산시스템, 기타사항 등으로 구분하여 분석하였다. 이 분석결과는 디지털환경에서의 대학도서관 서비스개선에 필요한 기초 자료로 이용할 수 있을 것이다.

• 천문학회보
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• 제40권1호
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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.

• 영어어문교육
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• 제17권3호
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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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• 제13권3호
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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.

• 대한가정학회지
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• 제39권9호
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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.

• 대한가정학회지
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• 제41권2호
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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.

• 대한가정학회지
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• 제48권9호
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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.