• 한국기계가공학회지
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• 제17권2호
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• pp.30-36
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• 2018

Since the freezer compartment and the refrigerating compartment are located side by side in a side-by-side refrigerator, the problems of the door height difference (DHD) and door flatness difference (DFD) have been constantly raised. Deformation of the cabinet of a built-in side-by-side refrigerator under food and thermal loads was analyzed by the finite element software ANSYS. The DHD and DFD, occurring due to the deformation of the cabinet, evaluated. From the results of the analysis of the cabinet, the 3D CAD software CATIA was used to geometrically translate and rotate the freezing and refrigerating compartment doors, in consideration of the displacement of the hinge fastening point. Then, the coordinates of two points on the upper corner of the doors were determined, and the DHD and DFD were obtained. It found that the thermal load, occurring under normal operation conditions, decreases the door height difference, but increases the door flatness difference. Values of the analyzed DHD and DFD appear smaller than the acceptance criteria used by the refrigerator manufacturer.

• 한국기계가공학회지
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• 제17권5호
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• pp.76-83
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• 2018

A cabinet-door integrated finite element model was constructed for a built-in side-by-side refrigerator with an ice dispenser, and its deformation was analyzed using the ANSYS finite element software. As loads, the food load needed to fill in the cabinet and doors and the thermal load occurring during normal operation conditions were taken into consideration. The door height difference (DHD) and door flatness difference (DFD) between the two doors of the freezing and refrigerating compartments were derived. The DHD and DFD under the assembled condition without applied loads satisfied the acceptance criteria specified by the refrigerator manufacturer. It appeared that the food load increases the DFD slightly. The thermal load tends to increase the differences because of the thermal deformation, especially the DFD, of the cabinet and doors.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2004년도 추계학술대회
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• pp.528-533
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• 2004

This paper deals with the issue of door height difference (DHD) which occurs for SBS refrigerator necessarily. In order to identify the cause of DHD, analysis of refrigerator structure and entire process from door manufacturing to usage have been investigated. From diverse experiments, it was found that the flatness of the floor was a main causing factor. In order to decrease the DHD , the effects of 6 design parameters to control of cabinet deformation have been investigated by using DOE(design of experiment) and finite element analysis. Based on the correlation equation, it was possible to estimate the DHD for new refrigerator design.

• 한국산학기술학회논문지
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• 제19권9호
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• pp.465-473
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• 2018

냉동실 도어에 얼음디스펜서와 냉장실 도어에 홈바가 장착된 빌트인 양문형 냉장고 모델에 대하여 유한요소해석 프로그램인 ANSYS를 사용하여 캐비닛과 도어를 통합한 유한요소모델을 구성하고 변형해석을 수행하였다. 하중으로는 냉장고가 조립된 조건, 그리고 캐비닛 선반과 도어 배스킷에 적재되는 식품 부하물 하중과 냉장고 정상 작동 시의 온도분포에 의한 열하중조건을 고려하였다. 캐비닛과 도어의 변형량 해석결과에 기반하여 냉동실 도어와 냉장실 도어 사이의 상하단차와 앞뒤단차를 평가하고, 냉기 밀봉에 영향을 미치는 캐비닛 전면과 도어 내면 사이에 위치한 도어 개스킷의 간극의 증가량을 평가하였다. 부하물이 없고 냉장고가 작동하지 않는 조건의 해석결과 계산된 상하단차와 앞뒤단차는 제품 출하 시의 허용기준을 만족하는 것으로 나타났다. 부하물이 투입되고 냉장고가 정상 작동하는 열하중조건의 해석결과 계산된 상하단차와 앞뒤단차는 조립조건에 비해 증가하며 특히 앞뒤단차가 크게 증가시키는 것으로 나타났다. 열하중조건의 해석결과 계산된 캐비닛 전면과 도어 내면의 변위로부터 도어의 사각 테두리에 부착되는 개스킷 간극의 증가량을 평가하였다. 최대 간극 증가량은 냉동실 도어의 좌측 테두리에서 발생하며 제조업체에서 정한 허용기준을 만족하는 것으로 나타났다.

• 소성∙가공
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• 제24권4호
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• pp.280-286
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• 2015

Hemming is used to connect two sheet metal components by folding the edge of an outer panel around an inner panel to create a smooth edge. The minimization of hemming defects is critical to the final quality of automobile products because hemming is one of the last operations during fabrication. Designing the hemmed part is not easy and is influenced by the geometry of the bent part. Therefore, the main problem for automotive parts is dimensional accuracy since formed products often deviate geometrically due to large springback. Few numerical approaches using 3-dimensional finite element model have been applied to hemming due to the small element size which is needed to properly capture the bending behavior of the sheet around small die corner and the comparatively big size of automotive opening parts, such as doors, hoods and deck lids. The current study concentrates on the 3-dimensional numerical simulation of hemming for an automotive door. The relationship between the design parameters of the hemming operation and the height difference defect is shown. Quality improvement of the automotive door can be increased through the study of model parameters.

• International Journal of Human Ecology
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• 제8권2호
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• pp.29-46
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• 2007

The purpose of this study was to analyze characteristics of the bedroom environment of nursing homes for the elderly in Korea. Field case research was performed using a structured checklist and measurements, from Oct. 28th to Dec. 2nd, 2006. Collected data were analyzed for cognitive efficiency, privacy, safety, supportiveness and amenity. Based on nursing homes for the elderly nationwide (Ministry of Health and Welfare, 2006), we choose 43 facilities in which Seoul and six megalopolis areas that had answered our questionnaire in 2006. We then narrowed the list to 14 facilities, balanced them in terms of regional population. The contents of investigation consisted of eight categories: that general characteristics of the bedrooms (including number of residents per room, using a bed or floor mat, the size and shape of the chamber, space for wheelchair turning, signage), door of bedroom (including door, doorknob, door sill/level difference), windows in the bedroom(including type of window, window sill height, window treatment, window safety device/shape, view/daylight), furniture (including personal furniture and lock), finishes (material, character and color of wall, floor, ceiling), lighting (including types of lighting, night lighting, switch), bathroom in the bedroom (including signage, door size/type, doorknob shape, height of the washbowl, size of toilet bowl, handrail, finishes), and other facilities (including outlet and handrails).

• 한국자원식물학회:학술대회논문집
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• 한국자원식물학회 2020년도 춘계학술대회
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• pp.67-67
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• 2020

Though there is an on-going need for the diversity of ornamental plants for in-door environment, their growth and stress adaptability in comparatively low light intensity condition require further studies for implementation. Here investigates the growth and chlorophyll fluorescence parameters of Farfugium japonicum (L.) Kitam, Liriope muscari (Decne.) L.H.Bailey and Acorus gramineus Aiton under several light intensities which were based on common in-door environment. The growth measurement of the plants included the quantity, length, width and SPAD value of the leaves. Calculated values of Fm/Fo, Fv/Fm, Pi_Abs, ETo/RC and DIo/RC were used as the parameters of the chlorophyll fluorescence under 10, 50, 100 and 200 PPFD (μmol·m^-2·s^-1) light intensities. In-door plants group was put in a closed room allowing no other light sources for 10 weeks and the control group was put in glass-greenhouse for the same period. The overall in-door growth of L. muscari was not significantly different in all light intensities compared to the control group and even showed the higher SPAD values. Also, an increasing tendency of Pi_Abs value under 10 to 100 PPFD was observed implying that L.muscari could adapt well to in-door environment. Measurement of A. gramineus growth mostly showed the highest values in the control group especially in the number of the leaves. Nevertheless, chlorophyll fluorescence parameters showed no significant value difference between in-door and the control groups and thus, A. gramineus might have possibility of successful adaptation to in-door environment. F. japonicum showed deficient growth in plant height and leaf length compared to the control but, it seemed to be able to sustain ornamental value under in-door light intensities. Furthermore, Pi_Abs and DIo/RC values were increased under in-door light conditions suggesting potential adaptability of F. japonicum.

• 한국주거학회:학술대회논문집
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• 한국주거학회 2000년도 학술발표대회논문집
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• pp.91-95
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• 2000

With 106 detached houses where the aged people live alone, this study was conducted to perform a location survey of their residential environment. The result of this study is summarized as follows: While the surveyed houses' safety, sanitation and convenience appeared to be positive, with respect to the conditions of location, 73％ of the surveyed houses did not meet the requirement for comfort. The average area of each space indicated that the bedding room was 12.05$m^2$, the living room 14.71$m^2$, the kitchen 9.06$m^2$, the bathing room 4.05$m^2$, and the rest room 2.59$m^2$. Then, 93.3％ of the bedding rooms had the doorsill. Also, 97.2％ of the surveyed houses had retrievable space. The form of their living room door showed a hinged door(54.5％) and a sliding door(45.5％) which were similar with each other. The finished material was that wood accounted for 42.6％ which was highest. The cooking table form of kitchen was mainly "\ulcorner"-shaped(49.5％) and "\ulcorner"-shaped(48.5％) which were highest, and their average height appeared to be 815mm. The fuel used for kitchen was that gas accounted for 93.3％, while 95.2％ of the surveyed houses was not equipped with any gas-warning device. 75.5％ had an integrated type of bath room and toilet. In addition, the stepped difference between the bath room and other space was that 70.8％ had the difference, but they had no a satisfactory sliding-prevention device(Not for 91.6％) or heating system(Not for 92.9％).stem(Not for 92.9％).

• 한국주거학회논문집
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• 제15권3호
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• pp.63-72
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• 2004

The objective of this study is to survey and analyze convenience of the disabled people to use the facilities in accommodations. The data used in this research has been obtained in the southern sea of Korea. According to the survey, it was very difficult for the disabled people with a wheel chair to access to the room because of the staircase, doorsill and the narrowed passage. Also, there was no the grab bar, braille blocks and exclusive elevators for the disabled. Moreover, it was not easy for them to access to the bedroom since there was a doorsill and a serious height difference between the lobby and the bedroom. It was shown that the disabled People also have a difficulty in using the toilet and the bathroom, because the width of door and floor height was not suitable for the design criteria. In the toilet, there was no handle on a chamber pot for the disabled people to hold, and the space was not enough for them to access to the pot and turn with a wheel chair.

• 한국산학기술학회논문지
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• 제13권7호
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• pp.3165-3174
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• 2012

최근 보편화되고 있는 대형 냉장고는 냉동실과 냉장실이 나란히 있는 양문형이다. 그런데 양문형 냉장고에 대한 고객들의 가장 큰 불만 중의 하나는 양쪽 도어를 닫았을 때 높이 차가 발생하는 문제이며, 이를 도어의 단차라고 한다. 단차 문제의 가장 큰 원인은 냉장고가 설치되는 바닥이 평편하지 못하거나 사용 기간이 경과함에 따라 냉장고 캐비닛이 변형되기 때문이다. 이러한 단차를 확인하였을 때 지금까지는 고객이나 A/S 직원이 렌치 등을 사용하여 냉장고 하부의 지지나사를 조절하여 냉장고의 수평을 맞춘다. 그러나 이러한 작업은 대형 냉장고의 경우 상대적으로 힘이 약한 주부나 노인이 조작하기에는 어려운 작업일 뿐만 아니라 이러한 방식을 고객에게 요구하는 것 자체가 고객의 불만족을 야기할 수 있다. 본 연구는 이러한 문제를 해결하기 위해 도어의 단차를 자동으로 감지하여 양쪽 도어를 같은 높이로 자동으로 조절해주는 새로운 메커니즘을 제안하였다. 제안된 메커니즘은 공구를 사용하여 힘들고 번거롭게 단차를 조절할 필요 없이 냉장고의 도어를 열고 닫는 동작만으로 자동으로 단 맞춤이 가능하게 한다.