• 대한지구과학교육학회지
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• 제5권1호
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• pp.75-87
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• 2012

The purpose of this study is to find out the effects of internet resource-based problem-based learning on the academic achievement in science and the attitude toward science of elementary school students. One experiment class and one control class of grade 6 students were selected to perform a prior investigation on the academic achievement in science and the attitude toward science, then the experiment class attended 4 weeks of lessons that was applied the internet resource-based problem-based learning, and the control class attended the traditional lessons based on the guidelines of teachers. After conducting lessons, a post investigation was performed for each class and the results were analyzed to produce the following conclusions. First, the internet resource-based problem-based learning could be seen to be effective in improving the students' academic achievements in science. The internet resource-based problem-based learning seemed to make students recognize the lesson details better and grasp well the questions given during lessons from the process of finding solutions among many informations and data on the internet. Second, the internet resource-based problem-based learning had a positive effect on all attitudes' areas toward science of students. It looked like that the internet resource-based problem-based learning taught the students to use the internet resources and gave them a friendly feeling, so the children could actively participate in class and had positive recognition on science. Third, from teacher observation and the result of the student recognition investigation, we could know that the students showed lots of interests in the internet resource-based problem-based learning, and they were able to understand the scientific theories in the process of solving problems that were relevant to real life, and thought science in a positive way.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 심포지엄 논문집 정보 및 제어부문
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• pp.237-239
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• 2007

In the paper, we analyze the performances of random access channels in multi-service multi-user OFDMA systems. The resource of the random access channels in OFDMA systems is the nubmer of available sub-channels and PN-codes. For given available sub-channels and PN-codes. we analyze the performances of the random access channels of OFDMA systems according to three resource allocation methods (resource full sharing, resource partial sharing, resource partition) in tenus of the access success probability, the blocking probability, the access delay and the throughput of each service class. Further, we find the feasible region of the access probability of each service class in which the allowable minimum access success probability, the allowable maximum blocking probability and the allowable maximum access delay are satisfied. The results also can be utilized to find proper region of the access probabilities of each service class for differentiated quality of service(QoS)s, and for the system operations.

• 한국통신학회논문지
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• 제28권9A호
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• pp.736-745
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• 2003

본 논문은 CDMA/TDD 시스템에서, 높은 전송률과 일정한 QoS를 갖는 실시간 클래스의 무선 자원 할당에 대한 방법론을 제시한다. 실시간 클래스와 비실시간 클래스를 제어하기 위하여, 예약 액세스 기법과 우선 순위 기법이 각각 제안된다. 또한 각 셀 링크간 간섭에 의한 성능 감소를 예방하기 위하여 슬롯 할당 기법을 제안한다. 제시된 방안들을 통하여 실시간 클래스의 연속성을 보장하고 비실시간 가입자를 최대로 수용할 수 있다. 다중 셀 환경과 멀티미디어 서비스 모델을 가정하여, 제안된 기법의 성능이 전송 지연, 채널 이용률 그리고 데이터 손실 등을 근거로 하여 평가된다. 시뮬레이션 결과는 상당한 성능 향상이 있음을 보인다.

• 가족자원경영과 정책
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• 제11권4호
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• pp.115-135
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• 2007

The purpose of this study was to investigate the complementary gender division of housework in the Yangban ruling class of the Choson period. During the Choson period, genders were distinctly divided. It was generally regarded that women had to stay indoors and take care of household matters, while men, on the other hand, did not need to be concerned with housework because of the Confucian practice of "Naeoe". But homes in traditional society were considered as being at the center of production, so the study explores if women and men complemented each other through reviewed literature. As the results indicate, women and men in the Choson period complemented each other in some housework, even in the Yangban ruling class who maintained their authority by following the Confucian practice. From the findings, it can be concluded that the complementary relations between women and men in the Choson period should be emphasized as the origin of shared housework.

• 가족자원경영과 정책
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• 제19권3호
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• pp.121-142
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• 2015

The purpose of this study is to resolve the factors that affect happiness levels and leisure life satisfaction of middle-class and to find way to incorporate them into policy. In this study, a status analysis on leisure life and One-Way ANOVA conduct a study on leisure resource and income levels that affect the happiness level and leisure life satisfaction. To recap briefly, to reduce the social and cultural polarization caused by economic disparity and to promote leisure life satisfaction and happiness level is possible quantitative-qualitative growth and maturation of middle class. The most important thing here is increasing in leisure time and leisure costs that consumed in real leisure life. In other words, leisure life satisfaction and happiness levels in the middle class has seen a significant difference in depending on whether and how much to spend on leisure time and cost, rather than differences of the monthly average household income. More particularly, analysis results seem to hoping of the extra leisure costs about 50,000 won per person and increasing the leisure time on weekdays and long weekend holiday. Above all, It is important to redefine the middle class that meets the recognition of the people and it should reflect government policy. Ultimately, The state of the socio-economic-welfare policies will be further expanded in the direction for the middle class, thinking of themselves as middle class and leading national consciousness.

• 한국실내디자인학회논문집
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• 제15권5호
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• pp.230-237
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• 2006

The purpose of this study was to propose a plan of Information Resource Center(IRC) with various multimedia and Internet materials applicable in class for 'K' Elementary School in Daejeon. As for research methods, this study reviewed the basic directions and characteristics of Information Resource Center(IRC) defined by the Ministry of Education and Human Development, and literature from various sources. Standards for the Information Resource Center(IRC) were suggested, a plan was proposed according to them. Ultimately, a plan with stable and flexible layout and flow lines, facilities and spaces within the Information Resource Center(IRC) was established and executed. The basic functions of Information Resource Center(IRC) were information, reading, consultation, graphic production. The spaces suggested in this study for the Information Resource Center(IRC) for elementary school were space for the literature information, information search, A/V information, studying, browsing, reading. This results will support teacher's teaching with various multimedia and Internet materials applicable in class, help student's self directed learning activity, and play its role as a cultural center of the local community.

• Water Engineering Research
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• 제3권4호
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• pp.259-267
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• 2002

South Africa has developed a policy and law that calls and provides for the equitable and sustainable use of water resources. Sustainable resource use is dependent on effective resource protection. Rivers are the most important freshwater resources in the country, and there is a focus on developing and applying methods to quantify what rivers need in terms of flow and water quality. These quantified and descriptive objectives are then related to specified levels of ecological health in a classification system. This paper provides an overview of an integrated and systematic methodology, where, fer each river, and each river reach, the natural condition and the present ecological condition are described, and a level/class of ecosystem health is selected. The class will define long term management goals. This procedure requires each ecosystem component to be quantified, starting with the abiotic template. A modified flow regime is modelled for each ecosystem health class, and the resultant fluvial geomorphology and hydraulic habitats are described. Then the water chemistry is described, and the water quality changes that are likely to occur as a consequence of altered flows are predicted. Finally, the responses to the stress imposed on the biota (fish, invertebrates and vegetation) by modified flow and water quality are predicted. All of the predicted responses are translated into descriptive and/or quantitative management objectives. The paper concludes with the recognition of active method development, and the enormous challenge of applying the methods, implementing the law, and achieving river protection and sustainable resource-use.

• Human Ecology Research
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• 제52권6호
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• pp.669-682
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• 2014

The purpose of this study is to present a practical class design model that applies the problem-based learning (PBL) method to the subject of home economics. To begin with, a specific class model example was developed by conducting thorough document research and expert consulting. Two modules, named "Click! Global Leisure Environment" and "Happy Leisure Product Launching" were presented as the PBL questions. The case study focused upon in this research is an elective course called "Leisure Culture and Life Management". The 21 students enrolled in this course were considered in this study. Two teaching methods, namely a face-to-face teaching method and a web-based system "Snowboard" teaching method, were used to run the class. The research results are as follows: first, theoretical research and program development and demonstration were practiced with five different age groups: childhood, adolescence, university student, middle age, and senescence. Then, selfevaluation, peer evaluation, and group evaluation were conducted to motivate the students. Finally, a class evaluation was conducted by questioning the lecturer, who ranked well, scoring higher than or equal to 4.0 points out of 5.0 on all the questions. Through the PBL method, students showed an improved study attitude with more proactive participation in the class, they strengthened their communication skills and created a synergy with their team members. This study has significant meaning because it is the first research to apply the PBL method to home economics. Therefore, we expect other curricula to apply PBL and fully utilize this teaching method as well in the future.

• 한국산림과학회지
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• 제100권4호
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• pp.672-680
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• 2011

본 연구는 지자체 업무담당자 32명, 산촌생태마을 운영매니저 31명, 전문가 33명, 총 96명을 대상으로 산림청의 산림탄소순환마을 대상지 선정 평가표 개발을 위해 수행하였다. 설문결과분석은 델파이법과 AHP법을 혼합한 DHP분석법을 활용하였다. 산림탄소순환마을 시범사업 선정 평가인자로 1계층 3개 속성, 2계층 10개 속성인자, 3계층 38개 속성세부인자를 선정하였다. 각 속성에 대한 일관성 지수(C.I)를 도출하여 중요도 평가의 기준으로 사용하였다. 1계층의 상대적 중요도가 가장 높은 속성은 인적자원속성(0.454)으로 나타났다. 2계층 속성인자들의 상대적 중요도는 물리적 자원 속성(1계층)에서 산림 Biomass자원 속성인자(0.376), 인적자원속성(1계층)에서 리더역량 속성인자(0.326), 비전속성(1계층)에서 사업계획성 속성인자(0.346)가 상대적으로 높은 중요도를 나타냈다. 3계층 속성세부인자에서는 공동부지의 확보(0.266) 등을 포함한 38개 속성세부인자에 대하여 상대적 중요도를 제시하였다. 상기 도출된 결과를 바탕으로, 산림탄소순환마을 대상지 선정평가 기준표를 작성하였으며, 본 평가표는 2011년부터 산림탄소순환마을 시범 조성마을 선정의 평가기준으로 활용될 예정이다.

• 한국인터넷방송통신학회논문지
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• 제10권5호
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• pp.293-298
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• 2010

유비쿼터스 센서 네트워크(Ubiquitous Sensor Network) 기술의 핵심은 저전력 무선 통신기술과 효율적 라우팅을 위한 적절한 자원할당 기술이다. 센서 네트워크에서 효율적인 자원할당을 위해서는 서비스에 따른 차별화된 자원할당 방식이 필요하다. 이를 위하여, 본 논문에서는 유선망에 사용되는 PQ와 WRR의 단점을 보완하여 USN에 적용이 가능한 스케줄러 알고리즘을 제안한다. 제안된 알고리즘은 센서 네트워크에서 각 클래스의 큐 상태를 체크하여 퍼지 이론을 적용한 제어 정책에 따라 WRR 스케쥴러의 가중치를 동적으로 할당하였다. 시뮬레이션 결과 제안된 알고리즘은 EF 클래스의 패킷 손실률에서 WRR 스케쥴러 방식보다 평균 6.5% 향상되었으며, AF4 클래스에서는 PQ 방식보다 평균 45% 향상된 결과를 보였다.