5G 요구사항을 위한 초고밀집 네트워크 환경에서의 기술 이슈에 관한 연구

이병철(Lee ByungCheol),김훈(Kim Hoon),윤찬호(Yoon Chanho) 한국통신학회 2015 한국통신학회 학술대회논문집 Vol.2015 No.1

의복의 여유분에 따른 단열력의 변화와 Thermogram을 활용한 의복 표면 온도 특성 분석

이병철(Lee, Byungcheol),홍경희(Hong, Kyunghi),이예진(Lee, Yejin) 한국생활과학회 2010 한국생활과학회지 Vol.19 No.6

Effects of the ease of pattern on the thermal conditions of clothing were investigated through the measurement of clothing surface temperatures using infrared thermography. Four vests with different pattern ease were worn by five male subjects. Surface temperature distribution on the clothing were then examined using a thermogram to view thermo-regulating characteristics affected by the ease of pattern. Representative surface temperatures were calculated based on the percentage of the surface area within a certain temperature range and the midpoint value of the corresponding area. Representative surface temperatures matches well to the thermal insulation value measured by thermal manikin. Results indicated that representative surface temperature could be a useful quantitative value if some simple calculations were to be used alongside accurate image processing.

브래지어 날개 길이와 앞패널 밴드 너비가 인체 생리 반응 및 주관적 압박감 평가에 미치는 영향

이옥경(Lee, Okkyung),이병철(Lee, Byungcheol),홍경희(Hong, Kyunghi) 한국생활과학회 2019 한국생활과학회지 Vol.28 No.4

The aim of this study is to analyze the physiological and sensory response based on brassiere types having two different design parameters, i.e., different length of wing and band width of the front panel. This study involved nine middle aged-women who participated in the wear test and data on their subjective pressure sensation, brain wave and skin temperature was collected using Neurodata Acquisition System Model 12 (Grass Co., USA) and MP100 Biopac System. The main physiological parameters that displayed significant differences based on the brassiere types included; slow alpha wave at O₂ and theta wave at O₁. When pressure was exerted around the breast area, there was an decrease in slow alpha while theta wave was increased at O₂ and O₁ respectively. The subjects were very sensitive to the difference in pressure between the experimental brassieres during the subjective evaluation. Lower chest tightness, overall tightness, and overall fit presented the most significant differences. The front panels’ long band enhanced the negative pressure sensation significantly at each level of the wing length. Consequently, it is suggested that the length of the wing should be longer when the band length at the front panel is wider, compared with the scenario where there is no extra band on the front panel.

직물 미세구조의 3차원 표면 및 솔리드 형성 방법

이예진(Lee, Yejin),이병철(Lee, Byungcheol) 한국생활과학회 2012 한국생활과학회지 Vol.21 No.3

In-depth knowledge of fabric microstructure is essential for understanding clothing comfort since it plays a significant role in heat and mass transfer between the human body and clothing. In this study, a novel method was employed for investigating 3D surfaces and solid construction characteristics of specific fabrics by using a reverse engineering technique. The surface construction data were obtained by a confocal laser scanning microscope and then manipulated by a 3D analysis program. Triangle mesh was used for connecting each 3D point, with clouds and fabric surface characteristics created by rendering techniques. For generating a 3D solid model, determinants of radius of curvature was used. According to the proposed method, actual surface expression of the real fabric was achieved successfully. The results from this methodology can be applied to the detailed analysis of clothing comfort that is highly influenced by the microstructure of the fabric.

2D 패턴 축소율과 신축성 소재 특성이 3D 의복 변형에 미치는 영향

이예진(Yejin Lee),이병철(Byungcheol Lee) 한국생활환경학회 2012 한국생활환경학회지 Vol.19 No.2

2D pattern-making of stretch clothing is difficult because different elongations of fabrics on a 3D body make various clothing deformations which lead to change in original design and function of the clothing. Therefore, quantitative analysis of relations between 2D pattern and clothing deformation on a 3D body is an important topic of interest both for industry and academia. In this study, the effects of 2D pattern reduction rate and fabric elasticity were investigated by measuring how the points on a 2D pattern are correlated with the location change of the points on a 3D female dress form. 14 different sample trousers were tested with two different kinds of fabrics. The reference sample trousers have no ease allowance, and the other samples were made with different grading reduction rate based on the reference. The reduction rate was varied from 10 to 20% in the width direction and from 5 to 15% in the length direction. Representative points were selected in the 2D pattern and location changes of the points on a 3D dress form were measured. The correlations between 2D and 3D coordinates were analyzed by monitoring the location change of each point. The reduction of 2D pattern leads to different position change on the 3D dress form and the influences of pattern reduction rate is much higher than that of fabric property. Comparing to the width direction, the reduction rate of length direction shows much higher correlation along the length direction.

이기종 무선망 환경에서의 효과적인 주파수 대역 공유를 위한 스케쥴링 기법

조민지(Minji Cho),이병철(Byungcheol Lee),김훈(Hoon Kim) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.11

초밀집 무선 네트워크 환경에서 에너지 절감을 위한 연결성 기반 기지국 스위칭 기법

조소윤(Soyoun Cho),이병철(Byungcheol Lee),김훈(Hoon Kim) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.11

웹툰 내용 유형에 따른 페이지 넘김 방식에 대한 연구

김규인(Kyuin Kim),이병철(Byungcheol Lee),이준아(Juna Lee),손홍찬(Hongchan Son),김민선(Minsun Kim) 한국HCI학회 2014 한국HCI학회 학술대회 Vol.2014 No.2

웹툰은 컴퓨터와 인터넷의 급속한 보급이 가져온 현대의 콘텐츠이다. 특히 스마트폰의 등장으로 웹툰은 새로운 변화를 겪고 있다. 그러나 스마트폰이라는 시장에 특화된 ‘앱툰’은 여전히 활성화되고 있지 못하다. 이에 본 연구는 성장해가는 스마트폰 시장에 알맞은 웹툰 제공 방식을 알아보기 위해 페이지 넘김 방식(스크롤 방식 vs. 터치방식)과 웹툰의 내용 유형(스토리, 에피소드)에 따라 사용자의 웹툰 경험에 차이가 발생하는지 알아보고자 했다. 본 연구에서는 스토리 형 웹툰은 스크롤 방식에서, 에피소드 형 웹툰은 터치 방식에서 사용자의 편의성과 즐거움을 포함한 전반적인 만족도가 높을 것이라 예상하였으나 예상과는 다른 결과가 나타났다. 읽는 시간, 재미도, 편의성등에서는 웹툰 형식에 따라 페이지 넘김 방식에 유의한 차이가 없는 것으로 나타났다. 특히 스토리-스크롤 조건에서 참가자들은 스토리-터치 조건 보다 읽는 도중 더 많이 되돌아갔으며, 이는 기존 우리 가설과 반대되는 결과이다. 또한 웹툰의 내용 유형과 관계없이 터치 방식을 사용할 때 되돌아가기 조작에 대한 불만족이 높았다. Web-toon is a contemporary content which has appeared with the spread of computers and the internet. It is now going through a new change because of the advent of smart phones. However, App-toon which is a specialized version of web-toon for smart phones is still not popular. As a result, our research is focusing on an effect of paging methods(scroll and touch) and contents of webtoon(story and episode) on web-toon experiences of users to figure out the appropriate way to provide web-toon through smart phones. Our hypothesis was that users would satisfy more when the story is presented with the scroll method and the episode with the touch. However, there weren’t any meaningful differences between the paging methods depending on content type of web-toon in the reading times, enjoyment, and convenience. One of the noticeable results was that participants returned to the prior pages more in the story-scroll condition than in the story-touch condition, which contradicts our hypothesis. Also their dissatisfaction degree was high when they used the touch method regardless of the contents.

광미를 사용한 폴리머 시멘트 콘크리트의 강도 특성 및 내약품성

이병철,이주경,이윤수,이필호,이구연,전철수 강원대학교 부설 석재복합신소재 제품연구센터 1999 석재연 논문집 Vol.4 No.-

본 연구는 세골재의 일부를 광미로 치환하고 혼화제로 SBR 라택스를 사용하여 폴리머 시멘트 콘크리트 공시체를 제작한 후 강도특성 및 내약품성을 실험적으로 구명한 것이다. 그 결과 광미를 사용하지 않고 P/C비가 10%일 때 압축강도가 323㎏/㎠로 최고 값을 나타냈으며, 휨강도는 P/C비가 증가할수록 증가하여 P/C비가 10%일 때 89㎏/㎠를 나타냈다. 그리고 광미를 사용한 경우는 P/C비가 10%일때 압축강도가 357㎏/㎠, 휨강도가 92㎏/㎠로서 광미를 사용하지 않은 경우보다 높게 나타났다. 한편 10% HCI, 20%, NaOH 10% NaCl 수용액에 공시체를 3, 7, 14, 21, 28일간 침적 시킨 후 중량변화를 측정하여 내약품성을 실험한다. 광미를 사용한 경우가 우수한 내약품성을 나타냈다. 즉광미를 사용하지 않은 경우 P/C=0%일 때 28일 후 중량 변화가 11%였으나 P/C=20%일 때는 2%였고, 광미를 사용한 경우는 P/C=0%일 때 질량 변화가 6%였으나 P/C=20%일 때는 1.5%였으며 20% ,NaOH 10% NaCl 수용액에서는 질량이 증가하는 경향을 보였다. Polymer cement concrete is made by the modifying ordinary cement concrete with polymer additive. Until now polymer cement concrete is not used for the structural member, but it is growing to be considered as developing uses such as a waterproof of roof slab, and a road pavement. The polymer cement concrete, being used for those uses, is superior to the cement concrete against the inorganic, organic acid, salt of acetic acid and organic solvents generally. In this paper, the polymer cement concrete was made by the ratio of 1:1 of sands and metal-mine waste rocks in fine aggregate in order to solve the environmental pollution which causes the social problem by metal-mine waste rocks. It was measured for the compressive strength, flexural strength, and chemicals resistance was tested by dealing with 10% HCI, 20% NaOH and 10% NaCI aqueous solution.