• Annual Conference of KIPS
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• 2011.04a
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• pp.920-923
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• 2011

VANET에서 V2V, V2I 통신을 통해 다양한 서비스를 이용하기 위해서는 안전하고 신뢰성 있는 통신이 보장되어야 한다. 이를 위해 다양한 연구들이 진행되었으며, 기존 연구들 중 대칭키를 사용한 방법으로는 RAISE가 있다. RAISE는 대칭키를 기반으로 하였기 때문에 다른 연구들 보다 낮은 통신 및 연산 비용을 가진다. 하지만 메시지에 대한 인증을 즉시 제공하지 못하며, RSU가 불능이 되거나 존재하지 않는 환경에서는 차량이 서비스를 제공받지 못한다는 문제점이 있다. 본 논문에서는 이러한 문제점을 해결하기 위해 대칭키 기반의 그룹키와 식별자를 사용하여 메시지 인증을 제공하고, 메시지 인증과정에서 RSU에 비의존적인 인증 프로토콜을 제안한다.

• Annual Conference of KIPS
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• 2011.04a
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• pp.934-937
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• 2011

RSA는 인수분해의 어려움에 기반한 공개키 암호 시스템으로, 여러 분야에서 사용되고 있지만 연산속도가 느리다는 단점이 있다. 이를 개선하기 위해 RSA-CRT 기법이 제안되었다. 법의 크기를 줄여 연산 속도가 빠르다는 장점이 있는 반면 오류주입공격에 취약하다는 단점이 있다. 이를 보완 하기 위한 여러 기법들이 제안되었다. 하지만 제안된 기법들은 연산과정이 상대적으로 복잡하고 부가적인 연산에 따른 부담이 생겼다. 본 논문에서는 RSA-CRT 를 구현하여 사용되는 인자들의 크기에 따른 연산시간을 정량적으로 비교하고, 가상적으로 각 인자에 오류주입공격을 취해봄으로써 소수 추출에 약한 부분을 찾고 향후 연구 방향을 모색한다.

• Journal of KIISE
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• v.42 no.10
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• pp.1207-1221
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• 2015

This research was conducted both to analyze the determining factors of and to suggest resolution methods for the smart divide of adults over 65 years of age in the rapidly aging society of the 2000s and the smart society of the 2010s following the information society of the 1990s. The research model based on the Technology Acceptance Model (TAM) includes 6 determining factors derived from existing studies: Self Efficacy, Training, Accessibility, Playfulness, Cost Rationality, and Policy Support. Research data were collected through a survey given to a total of 243 older adults in 14 Senior Welfare Centers nationwide, and research hypotheses were verified by structural equation model (SEM) analysis. The results of this research that gives priority to the order of Political Support, Playfulness, Self Efficacy, Accessibility, Cost Rationality, and Training can be used to develop various resolution methods for the smart divide of adults over 65 years of age.

• 대한공업교육학회지
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• v.35 no.2
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• pp.182-203
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• 2010

The purpose of this study was to analyze of Information-related subjects on industry department of college scholastic ability test in Korea and Japan. These were compared with information-related foundation and data-technology foundation, programming on industry department test of vocational education area in college scholastic ability test in Korea and Japan and suggest implications of items development of college scholastic ability test in Korea. Based on the results of study, the following recommendations were made for new direction of items development of college scholastic ability test in Korea. First, Information-related foundation on industry department of National Center for University Entrance Examinations in Japan consisted of basic informations of agricultural, industry, commercial department etc. of vocational education area. Similarly it is necessary to introduce 'computer-related foundation' consist of common contents of several departments of college scholastic ability test in Korea. Second, it is necessary to diverse sub-item situations different from main item situations and introduce diverse situations of set type items of college scholastic ability test in Korea. Third, test for National Center for University Entrance Examinations in Japan consisted of several types items like this selecting answers on multi-answer group. it is necessary to introduce short answer type, completion type and supply type of college scholastic ability test in Korea.

• Journal of Korean Library and Information Science Society
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• v.37 no.4
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• pp.181-200
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• 2006

This study examined the perceptions of freshmen students on the use of a university library site. The students were in the beginning month of their undergraduate program in Hansung University without being taught a formal library instruction session. The results show users experienced uncertainty, difficultly, confusion and anxiety while they were interacting with various functions of the library site. The findings revealed that the users' perceptions were originated from: (1) the insufficiency of the students' knowledge and skills related to library use and (2) the inadequacy of the library system features, in particular its interface features. Based on the findings, implications to improve library instructional services and system interfaces are suggested.

• Journal of Educational Research in Mathematics
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• v.9 no.1
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• pp.321-332
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• 1999

This article made overtures of the relationship between interactive mathematics texts nd the prototype design of computer application with Computer Algebra System Math. Engine, linking together in the school mathematics. School teachers and researchers would try to construct mathematical materials with computers in educating students in the middle and high school grades. As the individual users come to manage hyper-media materials, so they meet with the problem of 'Who does control?'A mass user would be concerned with interactive mathematics materials directly or off-line at realtime and manipulate the process of problem-solving symbolically with MathView/sup 11)/ and ON-Math/sup 12)/. Discussion was made in developing the factor in the domestic situation and reaching out their hands for it. In conclusion, a user may reform the information of math-curriculum limitedly.

• The Journal of Korean Association of Computer Education
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• v.8 no.4
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• pp.37-47
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• 2005

Teaching ICT skills in extracurricular activity classes of commercial high school helps to bridge the digital divide of the students at the minimum cost, and gives them a chance of getting ICT-related licenses. The purpose of this study is to identify the determinants of satisfaction and planned behavior toward computer classes, offered as extracurricular activities in commercial high schools. A survey methodology was used to investigate a proposed model of influence, and regression analysis was used to analyze the results. The hypothesized model was largely supported by this analysis, and the overall results indicate that the intention to participate in the class is mostly influenced by the expected social effect, individual impact and playfulness from the class. In addition, it was found that the learning environment influences the level of playfulness and social effect, and that the contents quality has some impact on the level of the ease of study and playfulness. Useful suggestions for promoting computer classes as extracurricular activities in commercial high schools are also provided.

• Journal of the Korean earth science society
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• v.42 no.3
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• pp.325-343
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• 2021

This study aims to develop two science education programs using Angbuilgu and ancient astronomical data, are Korean astronomical heritage, and explore its educational possibility through the pilot application. Considering the TSK compositional characteristics of Angbuilgu and ancient astronomical data, linkage with science curriculum, and linkage with NOS, Angbuilgu was developed as a hands-on activity for elementary school students and ancient astronomical data as a science inquiry activity for middle and high school students. The educational availability of the developed program was confirmed by pilot application to elementary and high school groups. Through the Angbuilgu activity, the students refined their conceptual knowledge by correcting misconceptions about the solar motion by season and then confirmed the possibility of connection with the concept of the celestial coordinate system. Students recognized the scientific value of Angbuilgu and understood the nature of interactions STS. In the ancient astronomical data activity, students experienced inductive and deductive inquiry methods and utilized various information and strategies. Through the activities, students improved their scientific understanding and attitude towards TSK.

• KOMUNHWA
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• no.57
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• pp.301-314
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• 2001

1) Traditional university museums use displays and photo collections of antiquities as means for educating present and future generations. But the success in their mission hinges on whether they can induce the gallery to visit the places. Fortunately, sin

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.2
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• pp.462-471
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• 2018

Even though software (SW) education has not been considered part of the current national kindergarten curriculum, in practice there is growing interest in adopting it. Teachers would be expected to play a key role in the successful introduction and implementation of new educational changes, such as SW education. In preparation for its adoption in ECE, it would be useful to determine ECE teachers' perception and attitudes toward early childhood software education. For this study, 219 ECE teachers' level of concern toward SW education was surveyed using the Stages of Concern Questionnaire. It was found that the teachers' level of concern was the highest at stage 0-Unconcerned and that they had high levels of stage management, personal and informational concern. Thus, a non-user pattern was mostly indicated. However, compared to the typical non-user pattern, the pattern aspect close to critical non-user ever appeared to some extent. In addition, a significant difference in the level of concern was shown at all stages depending on the awareness of the necessity for SW education. The teachers with SW training experience showed a higher intensity only at stage 0. There was a statistically significant difference in stages 0 and 6 depending on the future implementation decision. These results will be utilized as a resource in building an ECE teachers' support system according to their level of concern about SW education.