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김건희,김효식,양순철,이상용,국명호,이선규,김윤중,홍권희 한국공작기계학회 2007 한국공작기계학회 추계학술대회논문집 Vol.2007 No.-
This paper describes development of low cost precision machine that has combined the Build-in Motor with a vacuum chuck. This study mainly aims to find out a cutting condition for maintaining optimum surface condition and to examine cutting characteristics of the precision machine that is equipped by diamond bites. The cutting materials is Al alloy. Several experiments were carried out to find out the main factors that affect the surface roughness such as principal axis RPM(rotation per minute), feeding speed, and cutting depth. As a result, we obtain The optimum cutting condition of the developed precision machine.
미생물 포괄 고정화방식을 이용한 수산물 가공공장 폐수처리
정병철,장수현,김종배,김건배,최선남,이근우,정병곤 7개 국립대학교 환경연구논문집 공동발행 위원회 2005 공업기술연구 Vol.5 No.-
Feasibility of simultaneous removal of organic and nitrogen is evaluated as applying microbial entrapping method to treat fish processing wastewater. Treatability test is conducted immobilizing activated sludge from municipal sewage treatment plant to gel matrix made of cellulose triacetate. Stable operation can be possible when applying organic and nitrogen loading rate increasingly to wastewater treatment system composed of anoxic and oxic tank. Organic loading rate and nitrogen loading rate are applied 0.65-1.72kg COD/㎥/d and 0.119-0.317kg T-N/㎥/d, respectively. In case of wastewater from fish processing plant used in this study, it is evaluated that 0.3kg T- N/㎥/d is upper limit of applicable space loading rate because effluent T-N concentration is exceed 60mg/L, legal effluent dishargeable limit of T-N concentration in Korea, when space loading rate is exceed 0.3kg T-N/㎥/d. It is evaluated that nitrification of system is performed efficiently regardless fo variation of applied loading rate because removal efficiency of NH_(4)^(+)-N is relatively constant when the applied NH_(4)^(+)-N loading rate is increased gradually, while decrease of T-N removal efficiency is apparent when the applied loading rate is increased gradually. Nitrate removal efficiency in this study is varied from 98.62% to 99.51% depending on applied loading rate, while nitrification efficiency of oxic reactor is varied from 94.0% to 96.9%. It is showed that COD removal efficiency is varied from 94.2% to 96.6% and T-N removal efficiency is varied from 73.4% to 83.4% depending on loading rate applied in this study.
Effect of TiO<sub>2</sub> particle size and layer thickness on mesoscopic perovskite solar cells
Lee, Dong Geon,Kim, Min-cheol,Kim, Byeong Jo,Kim, Dong Hoe,Lee, Sang Myeong,Choi, Mansoo,Lee, Sangwook,Jung, Hyun Suk Elsevier 2019 APPLIED SURFACE SCIENCE - Vol.477 No.-
<P><B>Abstract</B></P> <P>Mesoporous TiO<SUB>2</SUB> (mp-TiO<SUB>2</SUB>) layers are commonly used as electron transport layers in perovskite solar cells, which help to extract electrons from the perovskite light-absorbing layer and transport them to the electrodes. We investigated the effects of the layer thickness of mp-TiO<SUB>2</SUB> and particle size of TiO<SUB>2</SUB> on photovoltaic properties, in terms of the surface area of the mp-layer and the interfacial areas of the TiO<SUB>2</SUB> nanoparticles in the mp-layer. Various mp-TiO<SUB>2</SUB> layers with thicknesses of 150, 250, and 400 nm and particle sizes of 25 nm and 41 nm were prepared to compare the photovoltaic properties of such layer-containing perovskite solar cells. Time-resolved photoluminescence decay and impedance studies showed that interfacial resistance as well as perovskite-to-TiO<SUB>2</SUB> charge injection are important factors affecting photovoltaic performance. The deterioration of the photovoltaic parameters with increasing TiO<SUB>2</SUB>/TiO<SUB>2</SUB> interfacial area also confirms that the interfacial series resistance that arises from these connections should be reduced to enhance the performance of mesoscopic perovskite solar cells.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Electron injection and transport properties of mesoporous layer containing TiO<SUB>2</SUB> nanoparticles are investigated. </LI> <LI> The photovoltaic properties are poor with small TiO<SUB>2</SUB> particles and thick mesoporous layers. </LI> <LI> This poor performance is due to the increase of the area of the TiO<SUB>2</SUB>/TiO<SUB>2</SUB> interface. </LI> <LI> The TiO<SUB>2</SUB>/TiO<SUB>2</SUB> interfacial resistance largely influences the photovoltaic parameters. </LI> </UL> </P>
Lee, Yong-Jin,Lee, Tong-Geon,Jeon, Woong-Bae,Kim, Dae-Yeon,Hong, Min-Jeong,Lee, Man-Bo,Hyun, Jong-Nae,Kim, Mi-Jung,Lee, Mi-Ja,Park, Cheol-Su,Seo, Yong-Weon 한국작물학회 2010 Journal of crop science and biotechnology Vol.13 No.2
Cereal seed storage proteins are encoded by complex multigene families and their subunit profiles are highly related to end-use qualities. Each fraction of albumin and hordein was extracted and its subunit profile was evaluated in related to malt and grain quality parameters. The purpose of this study was to provide selection criteria for high quality malting barley using grain and malt quality parameters and biochemical-genetic information. Grain and malt quality of 13 local adaptability test (LAT) lines were evaluated for malting process. A total of 16 germplasm accessions of high or low seed storage protein content were also evaluated for biochemical-genetic analysis. The correlation coefficients among quality parameters were analyzed. Several important quality parameters in brewing process showed significant positive or negative correlations. Seed storage protein subunits of albumin and hordein of all tested lines and accessions were evaluated using 12% 1D SDS-PAGE. Scored data of protein subunit's presence or absence was applied to Agglomerative Hierarchical Clustering (AHC) for statistical analysis and showed specific grouping patterns among tested lines. Clustered lines with subunit information were highly related with agricultural performance and grain and malt qualities. Based on the profiles of seed storage protein subunits, association of hordein subunit of 38, 43, and 65 kDa with high malt scored lines was found. The obtained results would provide improved selection criteria for high quality malting barley in the malting barley breeding program.
나노실리카가 나노 셀룰로오스 섬유 보강 시멘트 페이스트의 수화에 미치는 영향
이건욱(Lee, Geon Wook),이시은(Lee, Shi Eun),장영수(Jang, Young Soo),우수지(Woo, Su Ji),유성원(Yoo, Sung Won),최영철(Choi, Young Cheol) 한국콘크리트학회 2021 한국콘크리트학회 학술대회 논문집 Vol.33 No.2
이 연구는 나노 실리카가 나노 셀룰로오스 섬유 보강 시멘트의 수화에 미치는 영향에 대해 조사하였다. 주요 변수는 나노 실리카 함유량이다. 미소 수화열 실험결과, 나노 실리카를 혼입한 시멘트 페이스트의 초기 수화반응이 촉진되는 것을 확인하였다. This study investigated the effect of nano-silica on the hydration of nano-cellulose fiber reinforced cement. The main variable is the content of nano-silica. As a result of the isothermal calorimetry test, it was confirmed that the initial hydration of the cement paste mixed with nano-silica powder was accelerated.
PCA와 LDA을 이용한 차량 번호판 통합 인식에 관한 연구
이진기(Lee, Jin-Ki),김현열(Kim, Hyun-Yul),이승규(Lee, Seung-Kyu),이건화(Lee, Geon-Wha),박영록(Park, Yung-Rok),안기남(An, Ki-Nam),배철수(Bae, Cheol-Su),박영철(Park, Young-Cheol) 한국정보전자통신기술학회 2013 한국정보전자통신기술학회논문지 Vol.6 No.1
최근 들어 기존의 녹색 바탕의 차량 번호판에서, 흰색 바탕의 신 차량 번호판으로 교체되고 있다. 하지만, 아직 기존의 차량 번호판이 신 차량 번호판으로 전면 교체 되지 않아 두 번호판 모두 사용되고 있기 때문에 주차 관리 시스템, 속도위반, 신호 위반 등 무인 카메라를 이용한 시스템에서, 기존 차량 번호판과 신 차량 번호판 특징에 맞는 인식 시스템이 요구된다. 따라서 본 논문에서는 이러한 문제를 해결하기 위해 기존의 녹색 번호판과 흰색 번호판 모두를 추출하고 인식 할 수 있는 알고리즘에 관한 연구를 수행하였다. 다양한 환경에서 획득한 차량 영상으로부터 번호판 영역을 추출하기 위하여 형태학적 특징을 이용하였고, 추출된 번호판 영역의 수평, 수직 히스토그램과 문자의 상대적 위치 정보를 이용하여, 문자를 분리하였다. 최종적으로, 분리된 문자를 인식하기 위해 주성분 분석법(PCA : Principal Component Analysis)과 선형 판별 분석법(LDA : Linear Discriminant Analysis)을 적용하여 인식 시스템을 구성하였다. 실험 결과, 불규칙한 조명 상태에서도 상대적으로 높은 추출률과 문자 인식률을 나타내었다. Recently, the color of vehicle license plate has been changed from green to white. Thus the vehicle plate recognition system used for parking management systems, speed and signal violation detection systems should be robust to the both colors. This paper presents a vehicle license plate recognition system, which works on both of green and white plate at the same time. In the proposed system, the image of license plate is taken from a captured vehicle image by using morphological information. In the next, each character region in the license plate image is extracted based on the vertical and horizontal projection of plate image and the relative position of individual characters. Finally, for the recognition process of extracted characters, PCA(Principal Component Analysis) and LDA(Linear Discriminant Analysis) are sequentially utilized. In the experiment, vehicle license plates of both green background and white background captured under irregular illumination conditions have been tested, and the relatively high extraction and recognition rates are observed.