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RISS 인기검색어
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- 저자 : 김경환(Gyeong-Hwan Kim) (검색결과 52 건)
- 무료
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김경환,김한도,성우경,Kim, Gyeong-Hwan,Kim, Han-Do,Seong, U-Gyeong 한국섬유공학회 1983 한국섬유공학회지 Vol.20 No.4
In general, the silk dyed with acid dyes is not good in fastness. To improve this defect, the silk dyed with Acid Mordant Blue 1 is treated with ferric nitrate solution. The results are as follows: 1) The amounts of iron absorbed on the dyed silk increase with the increase of temperature, concentration and pH of the ferric nitrate solution. 2) The development of the colour by the after chroming is accelerated according to the increase of treating temperature. In general, when the molar ratio between the absorbed dye and iron on the dyed silk is 1, the development of the colours reaches highest. 3) The colour fastness to light, washing, and hot water are improved by the after chroming, which is caused by the stable chelate formed with reaction of dye and ferric ion. 4) The amount of dye-Fe(III) complex is increased with the increase of Fe(III) concentration in the aqueous dye-Fe(NO$_3$)$_3$ solution which is the constant concentration of dye. With the reaction of Fe(III) on dye to the mole ratio 〔Fe(III)〕/〔dye〕=1, the absorbance of the maximum wavelength band 430nm of dye are decreased with the increase of the maximum wavelength band 590nm of dye-Fe(III) complex. As a results, it may be regarded that Fe(III) forms 1:1 complex type with the dye.
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Gate-Induced Drain Leakage를 줄인 새로운 구조의 고성능 Elevated Source Drain MOSFET에 관한 분석
김경환,최창순,김정태,최우영,Kim, Gyeong-Hwan,Choe, Chang-Sun,Kim, Jeong-Tae,Choe, U-Yeong 대한전자공학회 2001 電子工學會論文誌-SD (Semiconductor and devices) Vol.38 No.6
GIDL(Gate-Induced Drain-Leakage)을 줄일 수 있는 새로운 구조의 ESD(Elevated Source Drain) MOSFET을 제안하고 분석하였다. 제안된 구조는 SDE(Source Drain Extension) 영역이 들려진 형태를 갖고 있어서 SDE 임플란트시 매우 낮은 에너지 이온주입으로 인한 저활성화(low-activation) 효과를 방지 할 수 있다. 제안된 구조는 건식 식각 및 LAT(Large-Angle-Tilted) 이온주입 방법을 사용하여 소오스/드레인 구조를 결정한다. 기존의 LDD MOSFET과의 비교 시뮬레이션 결과, 제안된 ESD MOSFET은 전류 구동능력은 가장 크면서 GIDL 및 DIBL(Drain Induced Barrier Lowering) 값은 효과적으로 감소시킬 수 있음을 확인하였다. GIDL 전류가 감소되는 원인으로는 최대 전계의 위치가 드레인 쪽으로 이동함에 따라 최대 밴드간 터널링이 일어나는 곳에서의 최대 전계값이 감소되기 때문이다. A novel self-aligned ESD (Elevated Source Drain) MOSFET structure which can effectively reduce the GIDL (Gate-Induced Drain Leakage) current is proposed and analyzed. The proposed ESD structure is characterized by sidewall spacer and recessed-channel depth which are determined by dry-etching process. Elevation of the Source/Drain extension region is realized so that the low-activation effect caused by low-energy ion implantation can be avoided. Unlike the conventional LDD structures, it is shown that the GIDL current of the ESD structure is suppressed without sacrificing the maximum driving capability. The main reason for the reduction of GIDL current Is the decreased electric field at the point of the maximum band-to-band tunneling as the peak electric field is shifted toward the drain side.
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김경환,Kim, Gyeong-Hwan 한국전기기술인협회 2004 電力技術人 Vol.262 No.6
협회 춘계체육대회를 대신하여 실시된 무주양수발전소 견학, 발전소 견학이 처음인 나에겐 좋은 경험이 될 것 같았다. 무주를 향하는 버스에 속속 올라타는 협회 일행들의 얼굴에도 나들이에 대한 기대감이 서려있었다.<중략>
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히드라진/메탄올 용액처리에 의한 폴리에틸렌 테레탈레이트 필름의 개질에 관한 연구
김경환,조현혹,성우경,Kim, Gyeong-Hwan,Jo, Hyeon-Hok,Seong, U-Gyeong 한국섬유공학회 1988 한국섬유공학회지 Vol.25 No.4
In order to impart dyeability of PET film toward acid dyes, PET film was aminolyzed with 20%, 25%, 30% and 35% hydrazine hydrate in methanol at 30℃ for various time intervals. The changes of properties such as dyeability toward acid dyes, hydrazide end group content, weight loss, surface morphology, viscoelastic properties caused by aminolysis were investigated The results obtained from this study were as follows; 1. Weight loss, hydrazide end group content, and conversion to amide bond were found to gradually increase in the progress of aminolysis. 2. In aminolyzed PET, the apparent diffusion coefficient of acid dyes increased and apparent activation energies of diffusion decreased in the progress of aminolysis. 3. Chemical stress crack gradually occured on film surface in the progress of aminolysis. 4. Peak temperature of loss tangent tan δ and dynamic loss modulus E" of the film shifted to the lower temperature in the progress of aminolysis, Futhermore tensile modulus E' decreased.
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PET 섬유의 친수성(I) -아민분해 PET섬유의 친수성-
김경환,조현혹,성우경,Kim, Gyeong-Hwan,Jo, Hyeon-Hok,Seong, U-Gyeong 한국섬유공학회 1987 한국섬유공학회지 Vol.24 No.4
In order to improve hydrophilicity of PET fabric, PET fabric was aminolyzed with 5%, 15%, 25%, and 35% hydrazine hydrate aqueous solutions at 30$^{\circ}C$ for various time intervals. The changes of properties such as weight loss, crystallinity, moisture regain, intrinsic viscosity, dyeability of acid dye, moisture permeability, and morphology were investigated on the aminolyzed fibers. The results obtained from this study were as follows. 1. Weight loss, increase in degradation, increase in crystallinity, decrease in intrinsic viscosity, and depression in melting point, etc. were found to increase gradually with increase of hydrazine hydrate treatment time. 2. Moisture regain and moisture permeability coefficient of aminolyzed fabrics increased in accordance with increasing the crystallinity of fibers. 3. Aminolyzed PET showed improved dyeability toward acid dye. 4. Chemical stress crack occurred on fiber surfaces in proportion to reaction time with hydrazine hydrate aqueous solution.
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신경회로망을 이용한 제약 없이 쓰여진 필기체 문자열로부터 단어 분리 방법
김경환,Kim, Gyeong-Hwan 대한전자공학회 1999 電子工學會論文誌, C Vol.c36 No.7
필기서술의 인식과 관련된 연구는 인식대상 영상이 바르게 분리된 인식단위를 포함한다는 전제로 진행되어 왔다. 그러나 실제적인 필기인식 시스템의 설계에 있어서, 다양한 필기방식으로 인해, 인식단위로의 분리가 선결되어야 할 문제이다. 본 논문에서는 제한없이 쓰여진 필기 문자열로부터 인식의 도움없이 독립된 단어를 분리하는 방법을 제안한다. 구성요소간 물리적인 거리에 의존하는 종래의 방법과 달리, 필기서술 자체로부터 필기자의 띄어쓰기와 관련된 특징들을 적극적으로 추출하고 이를 신경회로망을 사용하여 해석한다. 띄어쓰기와 관련된 정보는 문자 분리과정을 통해 분리된 문자 세그먼트의 높이와 세그먼트 중심선 사이의 간격들을 정규화하여 구한다. 연결요소간의 거리에 기반한 방법들과의 비교실험을 통해 제한한 방법의 유용성을 입증하였다. Researches on the recognition of handwritten script have been conducted under the assumption that the isolated recognition units are provided as inputs. However, in practical recognition system designs, providing the isolated recognition unit is an challenge due to various writing syles. This paper proposes an approach for segmenting words from lines of unconstrained handwritten text, without help of recognition. In contrast to the conventional approaches which are based on physical gaps between connected components, clues that reflect the author's writing style, in terms of spacing, are extracted and utilized for the segmentation using a simple neural network. The clues are from character segments and include normalized heights and intervals of the segments. Effectiveness of the proposed approach compared with the conventional connected component based approaches in terms of word segmentation performance was evaluated by experiments.
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