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.

공간벡터 변조방식을 이용한 단상 PWM 정류기 설계

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

A single-phase PWM current source rectifier with a neutral leg is presented and throughly analyzed in this paper. This novel topology is implemented by adding an extra leg a step-down single phase PWM space vector modulation method to reduce the dc output voltage harmonics. The PWM pattern generation need a digital system. As compared with a conventional single-phase PWM rectifier, over 20% improvement of the total harmonics distortion in the output voltage can be obtained. Different SVM techniques are analyzed for this PWM rectifier and simulation results are presented.

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.

R-134a와 R-407C를 이용한 자동차 에어컨 성능평가에 관한 연구

하옥남,윤갑식 朝鮮大學校 機械技術硏究所 2001 機械技術硏究 Vol.4 No.1

HFC-134a is currently used as the refrigerant in motor vehicle air-conditioner, replacing the ozone depleting refrigerant CFC-12. Although HFC-134a has no ozone depletion potential, it has a relatively large global warming potential, approximately 1300 times that of CO_2 over a 100 year time horizon. Therefore, HFC-134a does not seem to be a perfect alternative refrigerant due to high GWP. For this reason, non-azeotropic refrigerant mixtures are expected to propose as a long-term and drop-in alternative to HFC-134a in the automobile air-conditioning system which has a variable operating conditions as a changes of RPM and pressure ratio. In this study, HFC-407C of which thermodynamic properties are similar to those of HFC-134a is selected among the non-azeotropic refrigerant mixtures. HFC-134a and HFC-407C were examined experimently by the performance test in the same automobile air-conditioning system.

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.

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.-

디자인 프로세스를 적용한 환자복 개발 사례 연구

이연희;박재옥;서미아;안민영 한양대학교 2004 韓國 生活 科學 硏究 Vol.- No.24

The purpose of this project was to design a patient's uniform which gives functional and psychological satisfaction to the patients. The project was developed to follow the design process. That is, the project was based on the survey which is on dissatisfaction of exiting patient's uniform, evaluation criteria and design preference for patient's uniform. The result of the survey was reflected to the design of new patient's uniform for Hanyang University Hospital. The uniform consists of a shirt and a pair of pants. The style of the garment is comfortable box-silhouette for ease and action. The shirt has a compromised neckline of U-neckline and round-neckline. It has buttons on front for closure, a patch pocketon left side of the garment. It also has three-quarter sleeves to complement dissatisfactions on the length and the distinction of seasons. The button extension was deeply given to avoid becoming open. To give decorative accents, piping was added. The ankle-length pants aredesigned to satisfy the need for shortening the length of existing uniform pants. The waistband of the pants has both closures, a drawstring and an elastic band, to make up for the dissatisfactions on durability and slip-off problems. The colors, white, light blue, pink, and yellow, are used to give a psychological sense of security to the patients. The flower symbol of Hanyang University was used for the textile surface design. Therefore, this project is worthwhile to present more systematic and scientific approach for patient's uniform design which gives functional and psychological satisfaction to the patients.

관측기를 이용한 유도전동기의 직접토오크제어

최연옥,이열선,조금배 조선대학교 전자정보통신연구소 2000 電子情報通信硏究所論文誌 Vol.3 No.1

Direct Torque Control(DTC) of AC motor has the fast torque and flux dynamic responses even though it has very simple scheme to implement However, DTC do not show good performance at low speed range with conventional open loop stator flux observer when stator resistance varied So, authors proposed nonlinear stator flux obsever in order to flux estimation at low speed and show its simulation results

유아의 사회성 증진을 위한 또래관계 기술 지도 프로그램의 타당성 연구

이윤옥 서원대학교 교육연구소 1993 敎育發展 Vol.12 No.1

The present study attempted to develop and test the validity of, the early therapeutic-educational demonstration programs, so called, social skill programs for intervening of low-status, low-skilled preschool children. This study was conducted through the following procedure : 1) developing a behavioral checklist of peer interaction, 2) selecting target behaviors and subjects, 3) developing demonstration programs, 4) program performance and effect measurement, 5) data analysis. The target behaviors of checklist consisted of the four social processes usually taught to the low-staus children in a preschool settings ; communication clarity, positive reciprocity, establishing common activity, intimacy. The subjects were 36 low-skilled preschool children with the age of 5 to 6 years. The important theories used in developing the programs were Mize & Ladd's(1990a) 'A Cognitive-Social Learning Model of Social Skill Training' ; Price & Dodge'(1989) 'Reciprocal influences in peer transactions involving socially rejected childrenJ. And Damon & Phelps's(1989) 'Strategic of Peer Learning'. The results proved that the early therapeutic programs(SSP) developed on the basis of the strategic of peer learning that is, peer tutoring and cooperative learning were effective in enhancing the sociability of low-status, low-skilled preschool children.

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.