정보취약계층을 위한 도서관 서비스 활성화 방안에 관한 연구
이 연구에서는 우리나라 공공 도서관에서 적극적으로 수용해야할 정보취약계층에 대한 정보서비스 확산을 위해 필요한 개념과 기본적인 정보서비스 전략을 제안하였다. 공공도서관은 정보취약계층을 크게 장애인과 생활보호대상자, 노인 등으로 구분하여 각 계층의 특성을 고려한 정보서비스를 제공하여야 한다. 이들을 위...
An Analysis on the Internet Uses and Barriers of the Older Adults in Korea
ABSTRACT The purpose of this study is to investigate the patterns and ba rriers of the Internet for the elderly adults in Korea. Data was collected through the face to face in terview using a questionnaire for the residence of Daegu and Kyungsang Buk-Do areas targeted over the 60-years-olds elder adults. A total of 119 valid response data were analyzed with the descr iptive statistics and the group differences by age and gender using SPSS 18.00. It found that the most of t he elder adults access the Internet to seek the entertainment contents, the knowledge-related conte nts, and the cultural and art contents. They spend most of the Internet online session to do searching information and enjoying movie and music. However, there were age differences and gender differenc es within the subjects. The complexity of computer and the Internet usage is one of the barriers for t he Internet access, and they suggest that a customized education and training courses of computer li teracy for the elderly adults would be the ways of resolve those obstructions.키워드: 고령층, 인터넷 활용, 장애 요인, 실태 조사, 차이 분석 Old People, Internet Uses, Obstructive Factors, Survey, Group D ifferences
LYAPUNOV-BASED TRANSFER BETWEEN ELLIPTIC KEPLERIAN ORBITS
We present a study of the transfer of satellites between elliptic Keplerian orbits using Lyapunov stability theory specific to this problem. The construction of Lyapunov functions is based on the fact that a non-degenerate Keplerian orbit is uniquely described by its angular momentum and Laplace (- Runge-Lenz) vectors. We suggest a Lyapunov function, which gives a feedback controller such that the target elliptic orbit becomes a locally asymptotically stable periodic orbit in the closed-loop dynamics. We show how to perform a global transfer between two arbitrary elliptic orbits based on the local transfer result. Finally, a second Lyapunov function is presented that works only for circular target orbits.