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Peptide-templating dye-sensitized solar cells
Han, Tae Hee,Moon, Hyoung-Seok,Hwang, Jin Ok,Seok, Sang Il,Im, Sang Hyuk,Kim, Sang Ouk IOP Pub 2010 Nanotechnology Vol.21 No.18
<P>A hollow TiO<SUB>2</SUB> nanoribbon network electrode for dye-sensitized solar cells (DSSC) was fabricated by a biotemplating process combining peptide self-assembly and atomic layer deposition (ALD). An aromatic peptide of diphenylalanine was assembled into a three-dimensional network consisting of highly entangled nanoribbons. A thin TiO<SUB>2</SUB> layer was deposited at the surface of the peptide template via the ALD process. After the pyrolysis of the peptide template, a highly entangled nanotubular TiO<SUB>2</SUB> framework was successfully prepared. Evolution of the crystal phase and crystallite size of the TiO<SUB>2</SUB> nanostructure was exploited by controlling the calcination temperature. Finally, the hollow TiO<SUB>2</SUB> nanoribbon network electrode was integrated into DSSC devices and their photochemical performances were investigated. Hollow TiO<SUB>2</SUB> nanoribbon-based DSSCs exhibited a power conversion efficiency of 3.8%, which is comparable to the conventional TiO<SUB>2</SUB> nanoparticle-based DSSCs (3.5%). Our approach offers a novel pathway for DSSCs consisting of TiO<SUB>2</SUB> electrodes via biotemplating. </P>
Influence of planting times on dry matter production and yield of soybean
Sang-Ouk Shin,Hyun-Tae Kim,Tae-Joung Ha,Won-Young Han,Jong-Min Ko,Kyung-Jin Choi,In-Yeul Baek,Keum-Yong Park,Sang-Chul Lee 한국작물학회 2008 한국작물학회 학술발표대회 논문집 Vol.2008 No.10
This experiment was carried out to clear optimum planting time for yield enlargement by comparing yield with dry matter at Miryang from 2005 to 2006. Variety used were Daewon, Daepung, Daol and Cheongja 3. Seeding was performed on April 30 to June 30 with 20day intervals and planting density was 142,857 palnts/ha (70×20㎝, 2plants per hill) with black vinyl mulching. In R2~R4 stages, crop growth rate(CGR) was largest on June 10 seeding. Although net assimilation rate(NAR) increased as seeding date was delayed, NAR on June 10 seeding was the highest throughout the growth period. Positive relationships were observed between NAR from R2 to R4 the ratio of pod to total dry matter weight. The LAI and total dry matter weight at the R4 stage was higher at earlier seeding date. In the case when seeding date was delayed, the ratio of leaf(source) and pod(sink) increased. From the comparison of all factors such as dry weight, optimum LAI, and of source to sink, the optimum planting date for high seed production was June 10. The highest yield was recorded with on June 10 seeding. Also, this seeding date showed high ratio of seed yield to dry matter in R2 stage. Difference between surveyed pod no. and theological pod no. which was calculated by dry matter ratio compared with standard seeding date(June 10) at R2 stage was the smallest in June 10 seeding.
효율적인 열에너지 회수를 위한 비성형 고형 연료의 연소 특성 연구
이상엽 ( Sang-yeop Lee ),서용칠 ( Yong-chil Seo ),이장수 ( Jang-soo Lee ),양원석 ( Won-seok Yang ),박세원 ( Se-won Park ),정연욱 ( Yeon-ouk Jeong ),한건호 ( Gun-ho Han ),한상국 ( Sang-guk Han ) 한국폐기물자원순환학회(구 한국폐기물학회) 2017 한국폐기물자원순환학회 추계학술발표논문집 Vol.2017 No.-
전 세계적으로 자원의 고갈과 온실가스로 인한 기후변화가 지구의 환경을 위협하는 요인으로 작용하고 있다. 이에 국내에서는 폐기물의 재활용을 촉진하고, 더 높은 부가가치를 부여하기 위한 기술·정책적 노력들이 이루어지고 있다. 그 중 하나로 생활폐기물을 기계적 선별공정과 생물학적 처리 공정이 결합된 MBT(Mechanical Biological Treatment) 시설이 도입되었다. 국내에서 발생되는 폐기물은 가연분 함량이 높아 SRF(Solid Refuse Fuel)로 생산할 경우 에너지 자원의 대체제로 사용 가능성이 크다고 판단된다. 이에 본 연구에서는 국내에서 생산되는 SRF에 대하여 기초특성분석을 실시하고 효율적인 열에너지 회수를 위해 연소실험을 진행하였다. 시료의 기초특성분석결과, 수분, 회분함량이 낮고 탄소성분과 발열량이 높게 나타났다. 연소 특성 및 오염 물질의 발생 특성을 파악하기 위하여 고정층 반응기에서 공기비 1.8~2.6 범위에서 실험을 진행하였다. 뿐만 아니라 각 공기비에서의 배가스 성분을 연소가스측정기(MK9000)를 이용해 그 특성을 알아보았으며 가스상 오염물질 배출특성을 알아보기 위하여 오염물질인 HCN, HCl 에 대해 분석을 실시하였다. 배가스 특성에서 CO의 농도가 거의 0%로 나타난 것으로 보아 완전연소가 잘 일어나고 있음을 판단 할 수 있었다. 또한 배출된 가스상 오염물질의 경우 배출 허용기준(HCl 15ppm, HCN 5ppm)을 모두 만족하는 것으로 나타났지만 NOx의 경우, 배출 허용 기준(80ppm)에 비해 약간 높은 값을 보였다. 모든 조건을 고려하였을 때 연소 반응이 활발히 일어나는 것을 알 수 있었지만 SRF를 연소공정에 적용시 추가적인 NOx 제어 시설이 필수적으로 설치되어야 할 것으로 판단된다.
Fabrication of 10-Channel Polymer Thermo-Optic Digital Optical Switch Array
Young-Tak Han,Jang-Uk Shin,Sang-Ho Park,Sang-Pil Han,Yongsoon Baek,Chul-Hee Lee,Young-Ouk Noh,Hyung-Jong Lee,Hyo-Hoon Park IEEE 2009 IEEE photonics technology letters Vol.21 No.20
<P>We present a 10-channel polymer thermo-optic digital optical switch (DOS) array with very low optical crosstalk. The 10-channel DOS array has a crosstalk-improved structure in which radiation-type attenuators are integrated in a series with a conventional 1 times 2 DOS. It is fabricated using a quartz substrate on which grid patterns for dispersion of stray light are formed to reduce the optical crosstalk. The measured crosstalk values are as low as -45 dB at a low electrical power of 50 mW. Insertion losses of less than 1.35 dB are achieved for all channels.</P>
Crosstalk-Enhanced DOS Integrated with Modified Radiation-Type Attenuators
Young-Tak Han,Jang-Uk Shin,Sang-Ho Park,Sang-Pil Han,Chul-Hee Lee,Young-Ouk Noh,Hyung-Jong Lee,Yongsoon Baek 한국전자통신연구원 2008 ETRI Journal Vol.30 No.5
This letter presents a crosstalk-enhanced polymer thermo-optic digital optical switch operating at a low power consumption. Modified radiation-type attenuators are integrated in a series with a conventional 1× 2 digital optical switch. A low optical crosstalk of less than -45 dB is attained at a low applied switching power of 60 mW, and an insertion loss of about 1.1 dB is exhibited.
Peptide/Graphene Hybrid Assembly into Core/Shell Nanowires
Han, Tae Hee,Lee, Won Jun,Lee, Duck Hyun,Kim, Ji Eun,Choi, Eun-Young,Kim, Sang Ouk WILEY-VCH Verlag 2010 Advanced Materials Vol.22 No.18
<B>Graphic Abstract</B> <P>Hybrid assembly of peptides and graphene into core/shell nanowires is presented here. Electroconductive nanowires comprised of multilayered graphene shells wrapped around peptide nanowire cores were readily assembled upon diluting peptide solution into an aqueous reduced graphene dispersion. Calcination of peptide cores generated a hollow graphene-shell network with large surface area and high thermal/chemical stability. <img src='wiley_img_2010/09359648-2010-22-18-ADMA200903221-content.gif' alt='wiley_img_2010/09359648-2010-22-18-ADMA200903221-content'> </P>
Evaluation of late-sowing-adaptable soybean cultivar in paddy field
Han Won Young,Park Hyeon Jin,Oh Ki Won,Kim Hyun Tae,Shin Sang Ouk,Lee Byong Won,Ko Jong Min,Baek In Youl 한국육종학회 2013 한국육종학회 심포지엄 Vol.2013 No.07
Soybean self-sufficiency in Korea was 22.5% in year 2011, and as free trade agreement between Korea and US comes into effect, the amount of soybean importation increases. In 2012, paddy field soybean cultivation was over 0.1 million ha and it is expected to increase continuously due to rise in market price of soybean. Moreover, double cropping system including paddy field soybean is widely adopted nationwide, but studies on appropriate cultivar for this environment are insufficient. In this research, the effect of planting date and different cultivars on soybean growth and yield was investigated for three planting dates (June 20, July 5, and July 20) with 15 cultivars. According to ANOVA test, soybean yield was significantly different depending on sowing date and cultivars and interaction between sowing date and cultivars was also detected, meaning each of cultivars resulted different yield depending on sowing date. When planted on July 20, stem length, nod number, branch number and grain weight was decreased because of short growing period, resulting in yield decrease. Percentage of yield obtained from July 20 in contrast to that of June 20 showed that Pungwon, Nampung and Daepung recorded the least yield decrease and the highest yield when planted late. Evaluation of late-sowing-adaptable soybean cultivar in paddy field is now being carried on following last year.