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김형자 ( Hyung Ja Kim ),유진형 ( Jin Hyung Yoo ) 한국공간디자인학회 2014 한국공간디자인학회논문집 Vol.9 No.2
(연구배경 및 목적)급격한 경제성장과 사회의식 변화 속에서 가족형태가 전형적 가족유형에서 다양한 형태의 소형가구 유형으로 변화를 겪고 있으며 사회는 다양하고 차별적인 생활양식이 공존하는 경향으로 발전되고 있다. 다양한 소형가구의 라이프스타일을 고려한 소형단독주택의 공간구성을 위해 아돌프 로스의 라움플란 공간특성을 통해 그 방법을 제안하는 것이 목적이다. (연구방법)라이프스타일과 소형주택의 이론적 고찰을 통해 라움플란의 공간특성과 소형가구의 6가지 라이프스타일 유형과의 관계성을 메트릭스로 도출한다. 이를 분석의 틀로 국내, 외의 소형단독주택의 사례분석을 통해 라움플란 공간특성이 적용되는 유형을 분석한다. (결과)그 결과 협소한 공간에서 거주자의 라이프스타일을 고려한 공간구성을 위해 Split-level 등을 통한 다양한 레벨의 사용을 도출하였다. 라움플란의 개념을 최근 소형주거의 요구특성에 맞게 재해석하여 소형 단독주택의 공간 활성화를 기대한다. (Background and Purpose)Due to rapid economic development and changes in social awareness, family types are changing from typical nuclear families into various types of units that live in small houses, and diverse and differentiated lifestyles are coexisting within society. The purpose of this study is to suggest layouts for use within small detached houses that suit different lifestyles, based on Adolf Loos` Raumplan spatial characteristics. (Method)Lifestyles and small houses were theoretically considered, and the relation between Raumplan spatial characteristics and six lifestyles found within small houses were addressed using a matrix. Domestic and overseas cases of small detached houses were then analyzed by using this matrix as an analytical tool. (Result)The application of various levels (for example, split levels) within houses is devised in order to best utilize space, considering the lifestyles of the relevant occupants. It is anticipated that the reinterpretation of the Raumplan concept will contribute to space revitalization of small, detached houses.
김형자(Hyung-Ja Kim),김영대(Young-Dae Kim),구영필(Young-Pil Koo) 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.35 No.-
Pressure and film thickness of contacting surfaces between teeth of the involute spur gear in lubricated condition were studied by a numerical method. Dynamics of the gear and pinion was considered to get an accurate initial clearance between gear teeth. The 3-dimensional non-steady elastohydrodanamic lubrication analysis on the gear teeth showed a slight higher pressure at the inlet region of the contacting face as well as pressure spike at the outlet region and a more thick film thickness than that of steady condition.
이광진,김형자,Kwang-Jin, Lee,Hyung-Ja, Kim 한국기계가공학회 2004 한국기계가공학회지 Vol.3 No.3
The sub-surface stress field beneath the spur gear's contact surface in lubricated condition has been analysed. The surface pressure was obtained by the elasto-hydrodynamic lubrication analysis using the accurate geometric clearances around the contact region of the teeth. The sub-surface stress field was calculated by using the Love's rectangular patch solution. The analysis results show that the sub-surface stress distribution is quite dependent on the surface pressure distribution. The pattern of sub-surface stress field is similar to that of the external load. The depth where the maximum effective stress occurs is not proportional to the intensity of the external load.
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구영필(Young-Pil Koo),김형자(Hyung-Ja Kim),김영대(Young-Dae Kim) 한국트라이볼로지학회 2003 한국트라이볼로지학회 학술대회 Vol.36 No.-
The sub-surface stress field beneath the gear's contacting surface due to the contact pressure in lubricated condition has been calculated. To evaluate consequence of the clearance shape on the stress field, two kinds of tooth profile models were chosen. One is conventional cylinder contact model and another is new numerical model. The Love's rectangular patch solution was used to obtain the sub-surface stress field. The maximum effective stress of the new model is lower than the one of the old model and the depth where the maximum effective stress occurs is shorter at high load.
구영필(Young-Pil Koo),김상준(Sang-Jun Kim),김형자(Hyung-Ja Kim),김영대(Young-Dae Kim),이규용(Kyu-Yong Lee) 한국트라이볼로지학회 2003 한국트라이볼로지학회 학술대회 Vol.36 No.-
Tribological behaviour of the alumina disk against bearing steel ball and the wear mechanism of alumina-bearing steel pair in the water-lubricated condition were studied. Wear test was done with a ball-on-disk type tribo-meter. Bearing steel ball weighed down the rotating alumina disk. Distilled water was supplied continuously to the ball and disk interface as lubricant. The trend of coefficient of friction for sliding distance was investigated under the various loads and sliding speeds. The wear track was examined by SEM and EPMA to define wear mechanism. Coefficient of friction was decreased with increasing sliding speed and decreasing normal load. For a high speed, coefficient of friction was stable regardless of variation of the normal load. The wear mechanism of alumina-bearing steel pair was proved to be combination of abrasive wear, adhesive wear and tribo-chemical wear.