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도시저소득층(都市低所得層) 가족계획실태분석(家族計劃實態分析) 대전ㆍ대구지역 (大田ㆍ大邱地域)을 중심(中心)으로
조남동 ( Nam-hoon Cho ),이임전 ( Im-jun Lee ) 한국보건사회연구원 1985 保健社會硏究 Vol.5 No.1
Since the inception of the national family planning program in 1962, the main emphasis has been placed on the provision of contraceptive services and IE&C activities through home visits by family planning field workers and through the government designated private physicians. This approach has been a powerful management system for the national program, particularly in the ru ral area. However, new issues in the national family planning program emerged with the subsequent socicreconomic changes since 1962. An increasing number of the rural population began to migrate to the urban area. and therefore beginning in the \970`s more weight had to be given 10 the family planning services for the urban area. in particular, for those in the low-income brackets. In an effort to increase contraceptive acceptors among the urban Jow·income people, the government has been implemented various special projects for them since 1974 through maximum utilization of community leaders including Tong and Ban Chiefs and mother`s clubs, and family planning workers in their areas. Thus, this paper is aimed to analyse the currenl status of family planning and fertility behavior of urban low-income wives as a part of program evaluation. Also, this paper is based on an analysis of the 1984 Family Planning Survey data which was can· ducted in July 1984 and responded by 600 married women aged 15 - 44 in the low-income areas of the Daejon and Daegu ci ties. The survey data revealed that the contraceptive practice rate was 77.0 percent which was much higher than 70.3 percent of the national practice rate in the same year, and the approval rate for the one or two children of the low-income areas was much higher than that of other urban areas. Based on the results of the analysis, the following recommendations are suggested for the beller program implementation; I) improvement of program management system for recruiting new acceptors in the 20s for birth spacing, 2) development and inducement of innovative incentive schems and IE&C activities for increasing the proportion of the one child families, and 3) strengthening the utilization of community resources including mother`s clubs.
토크 컨버터의 양면 마찰재가 드래그 토크에 미치는 영향
조남해(Namhae Cho),이인태(Intae Lee) 한국자동차공학회 2013 한국자동차공학회 지부 학술대회 논문집 Vol.2013 No.11
The automatic transmission’s vehicle have a lot of advantages as like the driving convenience, comfortable movement, soft change of speed and low transmission in comparison with manual vehicle. But, the power loss in auto transmission is inevitable because that generally has the characteristic that the power is transferred by the fluid. For this reason, the general auto transmission vehicle has a lower fuel efficiency than manual one. So, in order to make up for this disadvantage, the lock up function of torque converter is often used for improving this weak point. As the system that help the engine connect to transmission side directly, lock up clutch has the similar composition and characteristic of clutch in manual vehicle and also can improve the fuel efficiency in high-speed condition. By increasing the torque capacity that transfer the transmission by high-torque of engine, the lock up capacity also should be increased. For increasing the lock up capacity of lock up clutch, the wet frictionmaterial is one of the main functions. In order to extend the friction area of wet friction material, the twin facing friction material has been on the rise. When working the lock up clutch, the lock up capacity is increased because the twin facing material is connected between piston and front cover side. In contrary, this process can also cause the drag torque that is one of the main reason of low fuel efficiency due to this drag torque makes the unnecessary load to engine. The major factors that can determine that friction characteristic and durability life are basically ingredient materials, operation oil and control condition. In case of the control condition, the contact surface and rotation speed are an important factors for friction characteristic and durability of friction material. Though this study, it can be used for checking the influence on how much twin facing friction material impact the drag torque converter and conducting the study on the major factors of decreasing the drag torque while designing and controlling.
토크 컨버터의 역구동 록업 클러치 작동 응답성에 관한 연구
조남해(Namhae Cho),이재용(Jaeyong Lee),장재덕(Jaeduk Jang),주인식(Insik Joo) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Torque converter in automatic transmission transfer the engine power to transmission by ATF. Lock-up clutch of torque converter in automatic transmission has been recently designed with a significant purpose of achieving a more fuel economy. To reduce more fuel consumption, the slip is generated between a friction facing and a front cover for torque converter lock-up clutch. Also many studies of NVH and durability have been in order to increase lock-up area. In a lock-up clutch system a friction plate is one among key elements of torque transfer and is a made of wet friction material by synthetic fiber. The surface roughness of the front cover contact area, the friction material, the cooling condition and damper characteristics in a torque converter are important design parameters for the improvement of NVH and durability. Factors decide characteristics of friction material and material composition, apply pressure, rotation speed, ATF temperature. This test evaluates response time of Coasting lock-up clutch responsiveness in a torque converter.
비등 촉진 마이크로 구조물을 이용한 휴대용 컴퓨터 냉각시스템의 열성능에 관한 연구
조남해(N. H. Cho),정원용(W. Y. Jeong),박상희(S. H. Park) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
??The increasing heat generation rates in CPU of notebook computers motivate a research on cooling technologies with low thermal resistance. This paper develops a closed-loop two-phase cooling system using a micropump to circulate a dielectric liquid(PF5060). The cooling system consists of an evaporator containing a boiling enhancement microstructure connected to a condenser with mini fans providing external forced convection. The cooling system is characterized by a parametric study which determines the effects of volume fill ratio of coolant, existence of a boiling enhancement microstructure and pump flow rates on thermal performance of the closed loop. Experimental data shows the optimal parametric values which can dissipate 33.9W with a film heater maintained at 95℃.