• 한국정보통신학회논문지
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• 제13권7호
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• pp.1422-1428
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• 2009

독립형 무선 인지 시스템은 보통 채널에 대한 면허를 가지는 기사용자가 사용하지 않는 빈 채널을 사용하는 2차 사용자로서 동작한다. 기존연구에서는 이와 같은 2차 사용자가 가용한 채널을 찾을 때, 순차 혹은 무작위로 채널을 선택하여 기사용자의 사용 유무를 확인하였다. 하지만 이러한 방법은 무선 채널의 특성에 맞지 않다. 그러므로 본 논문에서는 이전에 채널을 기사용자가 사용한 경우를 고려하여 가중치 값을 결정하고, 각 채널별 상태 값 중에서 작은 순서대로 채널을 선택함으로써 빈 채널을 찾는데 소요되는 시간을 줄이는 방법을 제안하고, 2차 사용자의 평균 채널 찾기 시간과 평균 전송 횟수의 관점에서 순차적, 무작위적 방법과 그 성능을 비교 분석 한다.

• 한국수학교육학회지시리즈A:수학교육
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• 제50권1호
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• pp.13-25
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• 2011

The Goals of mathematics education for the lower grades of primary school is to shape the basic concepts and the skills of mathematics. To achieve this goal, it is necessary an assessment which is able to help the students' learning activities by precisely diagnosing their basic mathematical capability. It should lend the students an assistance in diagnosing and revising their problems throughout teacher's cognitive participation in the process of mathematical problem solving. I would like to suggest the dynamic assessment as one of these kinds of approaches. In order to prove the utilities of this way, it was examined the necessity of dynamic assessment on the basis of the Vygotsky's theory after looking into the characteristics of the contents and methods of the mathematics education for the lower grades of primary school. Next, I researched the principles of the dynamic assessment and embodied the assessment tool to evaluate the mathematical achievement of the lower grades of the primary school. Lastly, it was provided the examples of the dynamic assessment tool in order to assist the practice of it.

• 한국군사과학기술학회지
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• 제2권2호
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• pp.166-172
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• 1999

Weapon system is defined as a combination of primary system and logistics support system which are evaluated by capability and operational availability respectively. Weapon system developer thought that primary system was weapon system and also only primary system was important. Recent comparison of total life cycle cost showed that logistics support system was proved to be more important than primary system. However, until now no systematic approach to logistics support system development have applied in the area of developing support system and much money was exhausted by wrong logistics support system. We need to construct a universal metric for effectiveness of logistics support system and to cut out whatever activities or support elements which do not contribute to the metrics. This study describes a new approach under the name function approach to logistics support system development and also classifies five factors of failure frequency, stock out of frequency, administrative delay time, active repair time and logistic delay time that have influence on operational availability of logistics support system.

• 약학회지
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• 제42권1호
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• pp.108-113
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• 1998

G009, a polysaccharide isolated from the mycelia of Ganoderma lucidum IYO09, showed a hepatoprotective activity against $CCl_4$ induced cytotoxicity in primary cu ltured rat hepatocytes. Incubation of $CCl_4$-intoxicated hepatocytes with G009 significantly reduced the levels of glutamic pyruvic transaminase and sorbitol dehydrogenase released from hepatocytes in the medium. G009 showed antioxidative effect by elevating the activities of glutathione reductase and superoxide dismutase, and the content of glutathione in $CCl_4$-intoxidcated primary cultured rat hepatocytes. Furthermore, G009 significantly elevated glutathione-S-transferase activity in $CCl_4$-intoxicated primary cultured rat hepatocytes. G009 also reduced the production of malondialdehyde, a byproduct of lipid peroxidation. From these results, it could be concluded that G009 exerted hepatoprotective activity against $CCl_4$-induced cytotoxicity through antioxidation.

• Environmental Analysis Health and Toxicology
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• 제16권3호
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• pp.115-120
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• 2001

The predictive screening of various molecular descriptors for predicting cyclooxygenase inhibitor, lipooxygenase inhibitor, leucotriene synthesis inhibitor, leucotriene antagonist activities of Stilbene moieties have been investigated for the application of quantitative structure-activity relationships (QSAR). The biological activities for 36 compounds were computed by the PASS program and molecular descriptors are cited from literatures or calculated, to investigate feasibility of screening relevant descriptors and of their applications among biological endpoints. Fairly good correlations varying from 0.7828 to 0.9032 were obtained using 12 descriptors with 29 Stilbene derivatives and 5 diazo-compounds. Our studies reveal that LogKow, electron density(X), electron density (Y),4th-order valence connectivity and water solubility can be usefully employed to predict biological activities of stilbene derivatives with simple regression models.

• 지역사회간호학회지
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• 제4권2호
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• pp.158-169
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• 1993

Health promotions have been identified as foundamental concepts for nursing practice, especially in community health nursing. Nurses have been regarded as having important role's in health promotion activities. According to a review of literature, the concepts of health promotion consist of prevention services, health protection. Health prevention services have three levels : Primary secondary and tertiary. The objectives of this study are (1) to analyze the health promotion activities in school nursing. (2) to analyze health promotion activities in community health nursing posts. (3) to analyze the health promotion activities in industrial nursing while suggesting future direction for health promotion in community health nursing areas. The major results are first, Prevention services are most actively performed rather than health protection, and health education in three areas: School, industries, and community. Health nursing, secondary prevention services follow emergency care, and ordinary diseases control are especially active. Health promotion can ultimately from changing life be accomplished styles, and health behavior. As a consequence, future directions promoting health in community health nursing are desirable areas. Focusing on health protection, and health education that is not activated presently.

• 아동학회지
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• 제23권1호
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• pp.105-119
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• 2002

This study of child-rearing practices and daily activities of children during the Chosun dynasty was conducted through analysis of 91 traditional paintings of the period. Genre, figure, folk, and landscape paintings were included in the analysis. Findings were that child-rearing was strongly focused on the family. Generally, the mother was shown as the primary caregiver of the child. Grandmother, father, and grandfather also played a role in raising the child. The daily activities of the children consisted of helping with household chores, assisting the elderly, doing small jobs, studying, playing, performing for family members, and participating in family rituals and community events. Differences in child-rearing methods and contents of daily activities varied by gender and socio-economic status.

• 천문학논총
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• 제30권2호
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• pp.725-727
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• 2015

The Malaysian Space Agency (ANGKASA), with cooperation of the Ministry of Education of Malaysia, has organized the Astronomy Workshop for Primary and Secondary School Teachers since 2008 at the National Planetarium. The workshop was organized to provide science teachers with basic knowledge of astronomy in accordance with the school syllabus, with the hope that they can acquire sufficient knowledge in the field of astronomy to enhance their teaching activities in school. In this workshop, teachers will be introduced to night sky simulations in our space theater, a planetarium show, daytime and night time observation activities, hands on activities, and visits to the planetarium's observatory and exhibition gallery. Besides this, in the workshop they will share teaching experience with planetarium staff. Educational materials are also distributed to all the teachers as reference for their teaching. In this paper presentation, we would like to show how the National Planetarium plays an important role to help teachers in teaching astronomy in schools.

• 시큐리티연구
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• 제11호
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• pp.61-86
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• 2006

현대사회에서 끊임없이 지속되고 있는 크고 작은 국가요인 테러리즘은 사회와 국가의 안전에 심각한 영향을 미치고 있으며, 사회질서와 국가통치 질서에 큰 혼란을 초래하고 있다. 국가요인의 절대적 신변안전을 도모하기 위해 국가요인의 테러 위협환경과 그 경로를 차단해야하며, 이에 대한 효율적인 대응방안으로, 첫째, 최근 국가요인 테러사건은 주로 암살 및 폭탄공격, 자폭테러로 인해 한순간에 상황이 종료되는 경우가 대부분인 점을 감안할 때, 예방이 최선책임을 명심하고 사전적 대(對)테러 활동에 정부의 대(對)테러 관련기관들은 새로운 패러다임으로 방향설정과 정책개발을 추진해야 한다. 둘째, 경호 정보활동 강화 및 국내${\cdot}$외 유관기관과의 협조체제를 구축하고, 지속적인 대(對)테러 예방활동 시스템을 강구하며, 인적${\cdot}$물적 취약요소의 안전대책 활동을 강화하는 등 국가요인 테러리즘의 사전 예방대책 활동을 강화하여야 한다. 셋째, 테러단체를 직접 혹은 간접적으로 지원하는 국가들에 대한 정치${\cdot}$경제적ㄱ인 제재 및 테러리스트에 대한 처벌을 강화하는 등 국제공조체제를 구축하여야 한다. 넷째, 국가요인 경호시스템의 보완${\cdot}$발전과 테러리즘 대응을 위한 프로그램의 개발 및 합법적인 절차에 의해 테러방지법을 제정${\cdot}$보완하며, 대(對)테러 관련 임무를 수행하는 요원들에 대한 교육훈련 강화 및 경호기법${\cdot}$장비를 과학화하는 등 국가요인 테러리즘에 대한 대응능력을 강화해 나가야 한다.

• 한국초등수학교육학회지
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• 제3권1호
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• pp.21-39
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• 1999

Piaget 이론을 근거로 수학과 구성주의 교수-학습 원리를 알아보고 초등학교 수학과 교수-학습에 적용하는 지도 원리를 분류 활동, 수의 대소 비교와 부등호, 합이 10인 경우의 덧셈, 뺄셈의 기초, 세 수의 덧셈, 덧셈과 뺄셈의 관계, 덧셈과 뺄셈의 혼합 계산, 길이의 단위 도입, 0이 있는 나눗셈, 삼각형의 넓이 단위의 문제 등의 실제 사례를 통하여 소개하였다.