• Journal of the Korea Furniture Society
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• v.10 no.2
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• pp.9-16
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• 1999

The goal of the present study is to develop the Human Interface Elements(HIE's) for evaluating the physical suitability of office chairs. HIE is generally defined as the physical characteristic of manufacturing goods, and it is closely related to the body dimension of a user and environment that it is used. In the present study the design elements of a chair were investigated, and from here, HIE's of office chair were developed based on relatedness of the design components, the physical characteristics of users, and characteristics of an environment that it used. As a result, components of a chair were classified as 6 major parts: Seat pan, back rest, arm rest, function control unit, seat supports and whole system. 43 HIE's were extracted from there 6 components. Also, the method for measuring HIE were developed.

• Journal of the Korea Furniture Society
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• v.23 no.3
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• pp.271-289
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• 2012

This study analyzes the Western rocking chair style of the middle of the 20th century (1945~1970), and investigates academically characteristics from formative and practical points of view. The purpose of this study is to provide basic information on the design and production of the modern Korean rocking chair. In the 20th century, the production of the Western rocking chair displayed principles of both functionalism and optimism. These rocking chairs are constructed of various industrial materials including reinforced plastics, moulded plywood, aluminium, and steel as well as wood. Furthermore, a rocking chair suitable to the human body is made by industrial growth and innovative fabrication techniques such as designer's plastic from military in the First and Second World Wars. In those days, there are many different types of rocker style - traditional, plastics, structural, moulded plywood & bending, metal tubular, and wire mesh. More specifically, through economic prosperity and plastic development, the rocking chair is able to have light and bright colors, which shows sensible formality of the modern and structure.

• Journal of the Korea Furniture Society
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• v.24 no.3
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• pp.239-246
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• 2013

Recently the building is introducing the indoor water space. Thermal environment change with the introduction. Consequently, this study shows how water space in the public facility affects the indoor environment. We had put our experiment to measure the humidity and temperature differences in different distances of water space. The result of this study is as follows. First, We found that even though there's a water space, it makes no big change in temperature by different distance. The temperature was only maintained by a cooler. Second, As there's a water space, the humidity was affected by within 1.5 m of it. Through our experimental result, we have started our study to make a water space effective.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2000.06a
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• pp.138-143
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• 2000

This paper addresses experimental results carried out to investigate the transmission of seat vibration to the head for Korean. Vertical seat vibration in the frequency range of 0.5-30 Hz was applied to a seated Korean male subject. To examine the intra-variable effects on transmissibility, five different postures and three different vibration excitation levels were considered. The applied acceleration and head accelerations of the seated subject were measured simultaneously by using a 6-axes bite-bar. Detailed experimental results of measured transmissibilities are illustrated for each posture and/or vibration excitation level. They are found to allow the identification of dynamic characteristics of Korean seated body for various real vibration environments. Furthermore, they are expected to be very useful in designing new seats for automotive and railway vehicles and in improving their vibration ride quality.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2008.10a
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• pp.235-239
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• 2008

일상생활 중 지속적인 심장의 활동상태 모니터링을 통해 건강관리 및 응급상황에 대처하기 위한 많은 관련 연구들이 수행되고 있다. 심전도신호를 모니터링하기 위해서는 필수적으로 전극을 신체에 부착해야만 하며 피검자로 하여금 불편함을 초래한다. 본 연구에서는 가정 또는 사무실에서 무구속(non- restrained)적인 방법으로 심장의 활동상태를 모니터링하기 위하여 심탄도(ballistocardiogram, BCG)를 계측하고자 하였다. 심탄도는 심장의 수축과 이완에 따라 심장과 혈관에서의 혈류변화에 따른 탄도를 계측한 신호를 의미하며, 심탄도를 계측하기 위하여 로드셀을 이용한 의자형 무구속 심탄도 측정시스템을 구현하였다. 그리고 심탄도 신호로부터 건강정보의 추출을 위해 웨이브렛 변환과 템플릿 매칭(template maching)기법을 이용한 신호처리기법을 제안하였다. 구현된 시스템 및 신호처리기법의 타당성을 검토하기 위해 심전도와 동시에 심탄도를 측정하였으며, 상호 비교를 통해 심탄도 계측시스템의 유용성을 평가하였다.

• Proceedings of the KSME Conference
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• 2000.11a
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• pp.376-380
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• 2000

All chairs are uncomfortable in the long run, but some chairs become uncomfortable more rapidly than others, and in any particular chair, some people will be more uncomfortable than others. Comfort will depend upon the interaction of chair characteristics, user characteristics, and task characteristics. In this study, we intend to design the comfortable office chair by investigating the anthropometric and biomechanical aspects for Korean. Therefore, we determine the design dimensions using the analysis of anthropometric data. With these dimensions, we design the chair mechanism of which backrest reclines with increasing chair pan declination. This mechanism allows the back to get adequate support at the correct level for any backrest declination. Also, the lumbar support in the backrest descends with increasing backrest reclining. By using this chair, a considerably better sitting posture can be obtained, and uncomfortable feeling and back pain may be prevented.

• Transactions of the Korean Society of Automotive Engineers
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• v.18 no.2
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• pp.114-121
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• 2010

As a vehicle speed increases, more vibration energy is transmitted from chassis to a driver. Current isolation system for the driver's seat by damping control can reduce the transmitted vibration energy near resonance area. But in higher frequency region than natural frequency multiplied by $\sqrt{2}$, the vibration energy transmitted to the driver has a tendency to be increased. Therefore, the method by natural frequency reduction of the system is preferred to increase the effectiveness of the anti-vibration. However, the natural frequency could not be freely reduced due to the nature of the isolation system structure. A new passive suspension system to reduce the natural frequency is proposed. The theoretical analysis and experimental results show better vibration attenuation compared with the current isolation system.

• Proceedings of the Korea Contents Association Conference
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• 2013.05a
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• pp.223-224
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• 2013

이 연구는 뇌졸중환자를 대상으로 낙상예방을 위하여 오타고운동과 요부안정화운동을 실시하고 신체기능 및 장애물 보행의 변화를 측정하였다. 뇌졸중환자 20명을 대상으로 신체기능은 근력, 균형능력을 측정하였고, 장애물 보행은 장애물 극복속도와 최대수직여유를 측정하여 운동 전과 운동 후, 각 운동군 간을 비교분석하였다. 근력은 30초 의자에서 앉았다 일어나기, 균형은 FRT와 TUG 검사, 그리고 장애물 보행은 장애물 극복속도와 최대수직여유로 측정하였다. 실험결과 운동 후 ?고운동군은 요부안정화운동군에 비해 FRT와 장애물 극복속도는 유의하게 증가되었으며, TUG는 유의하게 감소되었다. 결론적으로 오타고 운동이 뇌졸중 환자의 신체기능 및 장애물 보행에 긍정적인 영향을 미친다.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 1998.11a
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• pp.116-120
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• 1998

난방.공조공간에서는 강한 기류가 Draft를 유발한다. Draft라 함은 인체가 기류(Air Movement)에 의해 원하지 않은 국부적인 냉각효과를 받는 것을 말한다(ASHRAE). 본 연구에서는 피험자의 체감실험을 통해 겨울철 대류난방시 실온 설정조건에 대한 기류속도의 허용범위을 찾고자 .하였다. 피험자는 일정 유니폼을 착용하고 의자에 앉은 상태로 실온 18.21.24$^{\circ}C$, 풍속 0.15.0.3.0.45m/s의 조건에서 기류감, 온냉감, 쾌불쾌감을 신고하였다. 실험시 착의량은 남자 0.7, 여자 1.0 clo이었으며, 실온이 21$^{\circ}C$일 때는 기류속도 0.15m/s까지, 실온이 24$^{\circ}C$일 때는 기류속도 0.3m/s까지 허용범위에 포함되었다.

• 대한예방의학회:학술대회논문집
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• 1996.10a
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• pp.273-274
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• 1996