森林의 公益機能 評價와 그 改善方案

尹英活,徐玉河 江原大學校 林科大學 森林科學硏究所 1991 Journal of Forest Science Vol.7 No.-

The modern society has increased the needs for both public benefits of forests and the economic functions of forest products. The increased public interest and concern for forests have been resulted from rapid growth of urban population, high industrialization, deterioration of environment, and etc. It is essential to evaluate the productive and environmantal functions of forests with a scientific criteria. The purpose of this study is to introduce the scientific evaluation method of such functions of forests, and to discuss its uses and limitations.

독일의 수발보험제도 도입에 따른 주간보호시설의 공간계획 기준에 관한 연구

남윤옥 한국의료복지시설학회 2007 의료·복지 건축 Vol.13 No.4

In Germany, community based daycare facilities has been supported by long term care policies since the 1970s. With the legislation of Care Insurance, those policy has been developed further. As the use of daycare facilities decreased and the financial burden for consumers increased, administrators of facilities has been seeking for innovative programs and management methods in order to improve the service. For the same reason, policy makers have been pursuing new regulations of architectural standards of facilities. By looking at legislations (i.e., Law of Care Insurance, Law of Heim, and DIN18025) that stipulate architectural standard of facilities in Germany, this study will identify the development process of architectural change of daycare facilities. In addition, the study aims to contribute to the discussion on the use of day care facilities in Korea in terms of the legislation of Care Insurance soon to be introduced.

태양의 고도에 대한 6학년 학생의 개념인식 유형 조사

이연우,우종옥 한국교원대학교 과학교육연구소 1994 청람과학교육연구논총 Vol.4 No.1

본 연구는 ‘태양의 고도’에 대하여 국민학교 6학년 학생들이 가지고 있는 개념인식유형을 조사한 것이다. 이 연구에서는 서울소재 국민학교 6학년 학생 211명을 무선 군표집하였으며, 지필검사와 면담을 병행하여 조사하였다. 이 연구에 의하면 1) 학생들은 태양의 고도에 대하여 다양한 개념인식유형을 가지고 있으며, 2) 특히, 태양광선이 ‘대류’를 한다든가, 혹은 ‘흘러내린다’라는 식으로 “유체”와 동등한 성질을 가진 것으로 인식하고 있었으며, 3) 또, 태양광선은 지표에만 닿아서 오로지 지표만을 가열시킨다고 생각하였다. The purpose of this study is to analysis the patterns of concepts of sixth-grade-students on "altitude of the sun". For this study, 211 students were sampled from sixth-grade-students in Seoul, and studied by both paper-tests and interviews. Now, we could get the conclusions as the following. 1) The selected students had the various patterns of concepts on altitude of the sun. 2) Especially, the students conceived 'lights of the sun' as "fluid". 3) Or, the students conceived that lights of the sun contact with the ground directly.

여성을 위한 법적 정치적 정의

초연옥 서울여자대학교 여성연구소 1989 여성연구논총 Vol.5 No.-

韓國의 Piano 演奏活動과 演奏傾向에 관한 小考

李蓮玉 단국대학교 대학원 1978 學術論叢 Vol.2 No.-

유치원 아동의 친구관계 증진을 위한 교수전략

李潤玉 西原大學校 1991 西原大學 論文集 Vol.27 No.-

The purpose of this study is to develop the program for promoting preschool children's friendships. For this purpose, the relations between friendships and prosocial behaviors, the prosocial behaviors development are reviewed and the tentative strategy is suggested. The results of this study are as follows ; 1. Prosocial behaviors are the important factors for the development of preschool children's friendships. 2. Prosocial behaviors can be developed and learned through cognitive maturity and experience in early childhood settings. 3. Intervention stategy for prosocial behaviors based on social-cognitive learning theory is positive effects on the increment of the prosocial behaviors. 4. The strategy which is focused on the increment for prosocial behaviors is developed using the model of instruction based on social-cognitive learning theory.

유아의 또래수용도와 또래집단 가입행동 유형간의 관계성

이윤옥 서원대학교 교육연구소 1995 敎育發展 Vol.1995 No.14

The goals of this research were to identify specific behavioral patterns that lead to successful outcomes and that differentiate popular and unpopular children in a specific situation, that of peer group entry. Popular, rejected, and neglected Kindergarten boys and girls(N=90) were asked to initiate play with a dyad of average peers in a structured laboratory setting. Observations of video records of the entry behaviors were conceptualized and coded as tactics used by children to complete the task of entry. Results were as follows. First, Observations of video records of the entry behaviors revealed that the status groups differed in the frequency of their attempts at peer group entry and the behaviors that they used during entry. The status group means revealed that the popular group was more likely to engage in group-oriented statements than other groups, F(2.51) = 8,098, P<.001, the rejected group engaged in disruptive entry tactics than other groups, F(2.51) = 4,139, P<.05. Second, popular group and neglected group were more likely to receive a neutral peer response than rejected group F(2,51) = 4.30, P<.05. Third, entry acceptance degree to entry attempts revealed that the popular group were more likely to receive high rates than other groups F(2,51)= 3.28, P<.05. Fourth, Positive response was positively related to the frame of reference of the group such as self-feferent statements in the popular and neglected group, while negative response was positively related to the disruptive behavior in the rejected group. The findings reported in this study would provide an important components of children's interpersonal skill program development in order to enhace to initial interactions with peers in children's peer group entry situations.

태양광 발전시스템의 최대전력추적을 위한 DC/DC 컨버터 제어

최연옥,서진연,장용해,정삼용,조금배 조선대학교 에너지.자원신기술연구소 1999 에너지·자원신기술연구소 논문지 Vol.21 No.2

Solar energy converters were used to convert the electrical energy from the solar arrays to a stable and reliable power source. The object of this paper is to analyze and design DC/DC converters of different types in a solar energy system in order to investigate the performance of the converters. A simple method which combines a discrete time control and a PI compensator is used to track the maximum power point of the solar array. The system is kept to operate close to MPPT's thus the maximum possible power transfer from the solar array is achieved. Experimental tests were carried out for buck, boost and buck-boost converters using a simple maximum power point tracking algorithm.

가변부하를 이용한 PV모듈의 시험회로 설계

최연옥,이열선,서진연,한승조,조금배 조선대학교 동력자원연구소 1997 動力資源硏究所誌 Vol.19 No.1

A complete computerized system for the characterization and performance testing of photovoltaics(PV) modules under natural sunlight and ambient condition was designed. I-V characteristics of PV module provides on essential diagnostic means in assessing the performance and internal cell parameters of PV module depends on its basic materials, manufacturing technology and operating environmental conditions. I-V curves derived from PV modules refect to a large extent the physical properties and their expected performance. In this paper, Electrical performance measurement and evaluation methods for solar cell module by MOSFET variable Load were studied. Also, Mathematical model and theory of solar cell associated with the photovoltaic effect has been discribed.

토오크 기울기를 이용한 유도전동기의 직접토오크제어

최연옥,정병호,조금배 조선대학교 전자정보통신연구소 2002 電子情報通信硏究所論文誌 Vol.5 No.1

In this paper, a direct torque control(DTC) method of an induction motor is proposed which enables constant switching frequency. The switching strategy of a conventional direct torque control scheme which is based on hysteresis comparator results in a variable switching frequency which depends on the speed, flux, stator voltage and hysteresis band of the comparator. This paper proposes a new switching strategy which determine the effective switching time on each switching period by comparing the ascending and descending torque slopes. The simulation results are presented to verify this proposed scheme.