http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
김형섭,진동식,조광수,서문호,Kim Hyungsup,Jin Dong Sik,Cho Kwang-Soo,Seo Moon Hwo 한국섬유공학회 2005 한국섬유공학회지 Vol.42 No.4
The filtration behaviors of glass filters were studied by measuring the air permeability, pressure drop and SEM images of five HEPA grade filter material. Based on the observations, the filtration mechanism was described in terms of fiber diameter, packing density and filter depth. The results indicate that the finer fibers and fibers on/near the filter media surface show better filtration performance. Also the captured particles on the fibers formed dendrites, which influenced further filtration.
시각 요소의 JND(Just Noticeable Difference)를 고려한 디스플레이 화질의 선호도 평가 방안
김형섭(Hyungsup Kim),서원용(Wonyoung Suh),김인기(Inki Kim),윤명한(Myung Hwan Yun) 한국HCI학회 2008 한국HCI학회 학술대회 Vol.2008 No.2
최근 관련 기술의 발전과 디지털 컨버전스의 가속화로 모바일 제품이 소형화, 다기능화 되어 가고 있다. 이러한 경향에 따라, 다양한 기능을 지원하기 위한 높은 사양의 디스플레이가 요구되고 있으며, 많은 업체들이 고화질, 고해상도 디스플레이의 개발에 경쟁적으로 매진하고 있다. 그러나 사용자의 인지적 특성을 고려하지 않은 고해상도 경쟁은 생산비용만 높이는 결과를 초래할 수 있다. 본 연구는 디스플레이의 설계 요소별 선호도를 분석하고, 사람이 탐지할 수 있는 두 자극 간의 최소한의 차이역(difference threshold)인 JND(Just Noticeable Difference)을 활용하여, 설계 요소의 인지적 특성을 파악하는 것을 목적으로 한다. 이를 위하여 모바일 제품에 주로 사용되는 TFT-LCD를 평가 대상으로, 30 명의 피실험자를 대상으로 JND 측정실험을 수행하였으며, 실험결과를 바탕으로 디스플레이에 대한 주요 설계변수들의 특성을 파악하였다. 이 연구결과는 사용자의 선호도를 고려한 모바일 제품의 디스플레이 설계지침으로 활용될 수 있을 것이다.
셀룰로스 나노휘스커 강화 셀룰로스 아세테이트 복합재료의 특성
조현은,송영한,김형섭,Cho, Hyun Eun,Song, Younghan,Kim, Hyungsup 한국섬유공학회 2014 한국섬유공학회지 Vol.51 No.6
Recently, nanomaterials obtained from biomass have gained attention due to their function and sustainability. Among bio-nanomaterials, cellulose nanowhisker (CNW) is one of the most potential materials for reinforcement of bioplastics due to its superior mechanical properties, biodegradability, and high aspect ratio. In the study, cellulose acetate composite was produced using CNW obtained under different conditions. There was a significant increase in the initial modulus of the composite with increasing CNW content, but there was no impact on the thermal stability.
구민경,박현규,김형섭,Ku, Min Kyung,Park, Hyunkyu,Kim, Hyungsup 한국섬유공학회 2013 한국섬유공학회지 Vol.50 No.3
In this study, cellulose microparticles were prepared by electrospraying. Cellulose pulp was dissolved in an ionic liquid at room temperature. The cellulose solution was electrosprayed under different processing parameters. The size of the resultant cellulose microparticles ranged from 5 to $10{\mu}m$. With increasing applied voltage, the size of the particles increased, and they had a smooth surface. The coagulation conditions affected the particle aggregation. The thermal properties of cellulose did not change as a result of electrospraying.
송영한,김창현,김형섭,Song, Younghan,Kim, Changhyun,Kim, Hyungsup 한국섬유공학회 2017 한국섬유공학회지 Vol.54 No.1
Recently, carbonaceous structures have drawn considerable attention owing to their electrochemical, mechanical, and thermal properties. Compared to conventional carbonization processes, hydrothermal carbonization has many merits, such as its relatively low processing temperature (below $400^{\circ}C$) and simple apparatus. In this study, hydrothermal carbonized structures were fabricated using a glucose solution of varying concentrations in the presence of a copper catalyst. The copper catalyst decreased the diameter of the hydrothermal-carbonized sphere. When the glucose concentration was low, the shape of the hydrothermal-carbonized material changed from spherical to planar.
구민경,양진욱,김형섭,Ku, Min Kyung,Yang, Jin Uk,Kim, Hyungsup 한국섬유공학회 2013 한국섬유공학회지 Vol.50 No.5
In this study, alginate fiber prepared by electrospinning was crosslinked using CaCl2. In order to improve the spinnability, glycerol was added to the aqueous solution of sodium alginate. The solution containing glycerol exhibited the crossover point of G' and G" at low frequencies and decreased the solution viscosity. A solution containing 4 wt% alginate was suitable for electrospinning and maintained the fiber shape. At higher alginate concentrations, the electrospun fiber transformed into a membrane-like structure. The crosslinked web exhibited improved thermal stability and reduced crystallinity.
이해수,박범수,김형섭,Lee, Haesu,Park, Beomsu,Kim, Hyungsup The Korean Fiber Society 2012 한국섬유공학회지 Vol.49 No.3
Polyacrylonitrile (PAN) fiber web was manufactured via electrospinning. The applied voltages were controlled at 20 and 25 kV during the electrospinning. In order to study the influences of the applied voltage and the collection area on the diameter and the crystallinity of the resulting fiber, specimens were obtained at the centers and boundaries of the collected web and characterized using SEM and XRD. The applied voltage showed a significant effect on the crystallinity, which increased with the applied voltage. Regardless of the applied voltage, the crystallinity of the fiber collected at the center showed higher values than the one in the boundary. The changes in the crystallinity can be attributed to the strength of the attractive force between the spinline and the collector, and the vaporization of the solvent from the spinline.
전기방사를 이용한 경피 약물 전달 체계용 알지네이트 웹 제조
구민경,김창현,김형섭,Ku, Min Kyung,Kim, Changhyun,Kim, Hyungsup 한국섬유공학회 2015 한국섬유공학회지 Vol.52 No.1
In this study, alginate was electrospun for transdermal drug delivery systems. The spinnability of alginate was improved by the reduction of intra-molecular hydrogen bonding using glycerol. The prepared alginate solutions were electrospun and coagulated in $CaCl_2$ aqueous solution for improved dimensional stability. To observe release ability, the electrospun alginate web was immersed in phosphate buffered saline (PBS) solution. Although 60% of dextran (drug model) was released from the prepared web within 30 minutes, the remaining drug was released continuously over 3 days. The results indicated that the prepared alginate web could be used as a transdermal drug delivery system.
주름의 주관적 평가요소와 이미지분석법을 통해 얻은 인자의 비교
신은호,박범수,서문호,김형섭,홍석기,장재원,Shin, Eun Ho,Park, Beomsu,Seo, Moon Ho,Kim, Hyungsup,Hong, Sogkie,Jang, Jaewon 한국섬유공학회 2013 한국섬유공학회지 Vol.50 No.1
Most researches on the objective evaluation of fabric wrinkle have ignored that are really important parameters in subjective evaluation using standard replicas. This research has been conducted to find the important parameters in subjective evaluation. In this research, the number and depth of wrinkle were found to be the important parameters. The number of wrinkle was calculated from the ridge density and the distribution of distance between ridges. The depth of wrinkle was calculated from shade length distribution using image analysis. The results showed strong non-linear relationships with those of subjective evaluation.