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Ecological Study of the Marine Algal Community at the Coast of Taean Thermal Power Plant, Korea
유종수,김영환,Yu, Jong-Su,Kim, Yeong-Hwan The Korean Society of Phycology 2003 ALGAE Vol.18 No.4
The community structure of benthic marine algae was investigated at Taean Thermal Power Plant and other places around Taean Peninsula, the west coast of Korea. Total of 100 species including 3 Cyanophyta, 14 Chlorophyta, 18 Phaeophyta, and 65 Rhodophyta were identified. The number of species was highest with 78 species at the Power Plant intake, followed by 61 at the discharge, 56 at Bunjeondo, and 50 at Maoe. It was noteworthy that a subtropical species Caulerpa okamurae was collected at the intake in autumn and it was the first observation in the west coast of Korea. The pattern of vertical algal distribution showed Gloiopeltis furcata occurred in the upper intertidal zone, Sargassum thunbergii and Corallina spp. in the middle and lower zone and Enteromorpha spp. in the lower middle zone. These were all dominant species except for Enteromopha spp., which was subdominant species. Other subdominant species were Chondrus ocellatus and Neorhodomela aculeata. The average diversity indices were between 0.70 and 1.20 at each area based on their dry weight. The similarity index was 0.79 between the algal flora of this study and that of 1987, indicating that the condition of the benthic environment remained unchanged since then. This area maintained its environmental quality, so the algal community remained same with similar structure. This study area seemed a suitable place for long term monitoring of the benthic environment where industrial facilities such as a power plant might affect the benthic algal community.
유종수,Yu,Jong-Su 한국조류학회(藻類) 2003 ALGAE Vol.18 No.4
Algal flora and community structure of benthic marine algae in the subtidal zone, Yeongil Bay area were studied. The number of algal species in the quadrats were identified totally 78: 2 Cyanophyta, 10 Chlorophyta, 19 Phaeophyta, and 47 Rhodophyta. The dominant species based on biomass were Sargassum hornerii, Undaria pinnatifida, and Sargassum thunbergii. Vertical distribution was clear by the representative algae such as, Undaria pinnatifida, Sargassum thunbergii, Sargassum horneri, Corallina spp. in the upper subtidal zone, Undaria pinnatifida, Sargassum horneri, Caulerpa okamurae in the middle zone, and Dictyopteris divaricata in the lower zone.
고 정밀 롤 임프린팅을 이용한 유연 전자소자용 투명전극 제작
유종수(Jong-Su Yu),유세민(Semin Yu),곽선우(Sun-Woo Kwak),김정수(Jung Su Kim) Korean Society for Precision Engineering 2014 한국정밀공학회지 Vol.31 No.11
Transparent conductive films (TCF) with excellent electrical properties and high mechanical flexibility have been widely studied because of their potential for application in optoelectronic devices such as light-emitting diodes, paper displays and organic solar cells. In this paper, we report on low-resistance and high-transparent TCF for flexible device applications. To fabricate a high-resolution roll imprinted TCF, the following steps were performed: the design and manufacture of an electroforming stamp mold, the fabrication of high-resolution roll imprinted on flexible film, the manufacture of Ag-nano paste which was filled into patterned film using a doctor blade process. Also, we was demonstrated with the successful application(ITO free organic photovoltaic) of the developed flexible TCF.
A Study of CIGS Coated Thin-Film Layer using Doctor Blade Process
유종수(Yu, Jong-Su),윤성만(Yoon, Seong Man),김도진(Kim, Do-Jin),조정대(Jo, Jeongdai) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
Recently, printing and coating technologies application fields have been expanded to the energy field such as solar cell. One of the main reasons, why many researchers have been interested in printing technology as a manufacturing method, is the reduction of manufacturing cost. In this paper, We fabricated CIGS solar cell thin film layer by doctor blade methods using synthesis of CIS precursor nanoparticles ink on molybdenum (Mo) coated soda-lime glass substrate. Synthesis CIS precursor nanoparticles ink fabrication was mixed Cu, In, Se powder and Ethylenediamine, using microwave and centrifuging. Using multi coating process as we could easily fabrication a fine flatness CIS thin-film layer (0.7{sim}1.35{mu}m), and reduce a manufacture cost and process steps. Also if we use printing and coating method and solution process in each layer of CIGS solar cell (electrode, buffer), it is possible to fabricate all printed thin-film solar cell.
유종수 ( Jong Su Yu ),이성윤 ( Seong Yun Lee ),나희영 ( Hee Yeong Na ),안태정 ( Tae Jung Ahn ),김현경 ( Hyun Kyoung Kim ) 한국고무학회 2012 엘라스토머 및 콤포지트 Vol.47 No.4
최근 들어 광, 온도, pH, 전기, 자성, 압력 등과 같은 외부 환경의 작은 변화에도 반응하여 모양/부피가 변하거나 기계적, 광학적, 전기적, 화학적 특성 등이 가역적으로 바뀌는 스마트 소재에 대한 관심이 높아지고 있다. 이러한 스마트 소재들 중 광조사에 의해 소재의 다양한 특성을 가역적으로 제어할 수 있는 광응답 스마트 소재가 많은 관심을 받고 있다. 본 논문에서는 광에너지를 받아 기계적 에너지로 바로 전환되어 인공근육, 모터 등과 같은 액츄에이터 기능을 할 수 있는 광구동형 스마트 고분자 소재들에 대해 소개하고자 한다. 특히, 광구동형 스마트 고분자 소재중에서도 마이크로와 매크로 스케일 변형이 가능한 아조벤젠을 함유한 비결정성 고분자, 액정 고분자, 자기 조립형 초분자에 대한 다양한 연구들에 대해 설명하고자 한다. Control of shape/volume, mechanical, optical, electrical, and chemical switching of materials by external stimuli such as light, temperature, pH, electric field, and pressure has attracted great attention. Among these materials, photo-responsive materials containing photochromic compounds such as azobenzene, spiropyran, and cinnamic acid groups have been the subject of intense interest in recent years. In this review, we describe the recent progress in the area of azobenzene containing polymer materials that can convert light energy into mechanical energy directly. Especially we focus our attention on light-driven actuators such as artificial muscle, motor, and valve. We summarize the photomechanical effects in liquid crystal elastomer, amorphous polymer, monolayer, and supramolecules containing azobenzene, respectively.
유종수(Yu, Jongsu),김정수(Kim, Jungsu),윤성만(Yoon, Sungman),김동수(Kim, Dongsoo),김도진(Kim, Dojin),조정대(Jo, Jeongdai) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.05
Materials with a combination of high electrical conductivity and optical transparency are important components of many electronic and optoelectronic devices such as liquid crystal displays, solar cells, and light emitting diodes. In this study, to fabricate a low-resistance and high optical transparent electrode film for organic photovoltaic, the following steps were performed: the design and manufacture of an electroforming stamp mold, the fabrication of thermal roll imprinted (TRI) poly-carbonate (PC) patterned films, the manufacture of high-conductivity and low-resistance Ag paste which was filled into patterned PC film using a doctor blade process and then coated with a thin film layer of conductive polymer by a spin coating process. As a result of these imprinting processes the PC films obtained a line width of 10{pm}0.5{mu}m, a channel length of 500{pm}2{mu}m, and a pattern depth of 7.34{pm}0.5{mu}m. After the Ag paste was used to fill part of the patterned film with conductive polymer coating, the following parameters were obtained: a sheet resistance of 9.65{Omega}/sq, optical transparency values were 83.69 % at a wavelength of 550 nm.
열형-롤 각인으로 형성한 Ag 격자 패턴과 전도성 고분자 코팅을 이용한 투명전극 필름 제작에 관한 연구
유종수(Jong-Su Yu),조정대(Jeongdai Jo),윤성만(Seong-Man Yoon),김도진(Do-Jin Kim) Korean Society for Precision Engineering 2010 한국정밀공학회지 Vol.27 No.9
In this study, to fabricate a low-resistance and high optical transparency electrode film, the following steps were performed: the design and manufacture of electroforming stamp, the fabrication of a thermal roll-imprinted polycarbonate (PC) patterned films, the filled low-resistance Ag paste using doctor blade process on patterned PC films and spin coating by conductive polymers. As a result of PC films imprinted line width of 26.69±2 ㎛, channel length of 245.57±2 ㎛, and pattern depth of 7.54±0.2 ㎛. Ag paste to fill part of the patterned film with conductive polymer coating and then the following parameters were obtained: a sheet resistance of 11.1 Ω/sq, optical transparency values at a wavelength of 550 ㎚ was 80.31 %.