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Lee, Sung-Hyun,Park, Junbeom,Kim, Hye-Rim,Lee, Taeseon,Lee, Jaegeun,Im, Yong-O.,Lee, Cheol-Hun,Cho, Hyunjung,Lee, Hyeseon,Jun, Chi-Hyuck,Ahn, Yu-Chan,Lee, In-Beum,Lee, Kun-Hong Elsevier 2016 Carbon Vol.100 No.-
<P>The optimum synthesis conditions for carbon nanotube (CNT) fibers were investigated using the Design of Experiment (DOE) technique. Direct spinning processes are governed by a variety of experimental factors: the methane flow rate, ferrocene flow rate, sulfur flow rate, hydrogen flow rate, water flow rate, and reaction temperature. The process was optimized in two stages that addressed first the Fractional Factorial Design (FFD) and then the Response Surface Methodology (RSM). Results from each experiment were classified according to a 6-step rating system: nothing(1), black gas(2), dust(3), ribbon or film(4), fiber(5), or continuous fiber(6). In the first step, three major factors (methane, sulfur, temperature) were identified as important among the six experimental factors tested using FFD. The effects of the major factors and the interactions were analyzed through the main effect plot and the interaction plot. In the second step, the experimental conditions were optimized using a model equation derived from Box-Behnken design experiments. Finally, the CNT fibers were continuously synthesized under the optimum conditions. The synthesized CNT fibers mainly consisted of single-walled CNTs (SWCNTs) 1.2 -3.8 nm in diameter. The I-G/I-D ratio of the CNT fibers was 48. This work provides a useful methodology for synthesizing the CNT fibers. (C) 2016 Elsevier Ltd. All rights reserved.</P>
Lee, Sung-Hyun,Kim, Hye-Rim,Lee, Taeseon,Lee, Haemin,Lee, Jinwoo,Lee, Jaegeun,Park, Junbeom,Lee, Kun-Hong Elsevier 2017 Carbon Vol.124 No.-
<P>Carbon nanotube (CNT) fibers were synthesized from ethylene, acetylene, or methane by separately injecting ferrocene and the carbon precursors during a direct spinning process. Ethylene and acetylene have low decomposition temperatures. It was difficult to synthesize CNT fibers from these precursors using the direct spinning method. CNT fibers were continuously synthesized by delaying the contact time between the catalyst particles and the carbon precursors, which provided sufficient time for catalyst growth. Changes in catalyst size from 2 nm to 20 nm were observed as a function of the catalyst formation step setting temperature (350-440 degrees C) and the carbon precursor injection tube length (8-310 mm), and the relationship between the catalyst size and the CNT diameter was characterized. The CNT fibers had higher I-G/I-D ratios when synthesized from acetylene (69.87) or ethylene (18.52) than from methane (3.61). The choice of the carbon precursor had a much larger effect on the I-G/I-D ratio of the synthesized CNT fibers than the other operating variables. (C) 2017 Elsevier Ltd. All rights reserved.</P>
Wonhoon Lee,Jieun Lee,Taeseon Lee,Hong Yul Seo,Minho Lee,Seunghwan Lee,Ki-Jeong Hong 한국응용곤충학회 2019 한국응용곤충학회 학술대회논문집 Vol.2019 No.04
Cinara (Cinara) cedri cedri Mimeur, 1936 is extensively distributed in Europe (France, Italy, Spain, and UK), North Africa (Morocco and Algeria), North America (California and New York), South America (Argentina), Middle East (Cyprus, Iran, Iraq, Israel, Lebanon, Syria, and Turkey), and Asia (China). Recently, this species was also invaded into China. In 2018, C. (Cinara) cedri cedri was firstly discovered on one plant, Cedrus deodara, in Korea. In this study, we provide full redescription in detail.
새만금간척지에서 점적관수량이 토양염농도와 녹색꽃양배추의 생육에 미치는 영향
배희수(Bae Huisu),황재복(Hwang Jaebok),김학신(Kim Haksin),구본일(Gu Bonil),최인배(Choi Inbae),박태선(Park Taeseon),박홍규(Park Hongkyu),이수환(Lee Suhwan),오양열(Oh Yangyeol),이상훈(Lee Sanghun),이건휘(Lee Geonhwi) (사)한국생물환경조절학회 2015 생물환경조절학회지 Vol.24 No.4
본 연구는 새만금 간척지에서 비닐하우스 작물 재배 가능성 검토를 위해 녹색꽃양배추를 대상으로 일일 관수량을 달리하여 관수량에 따른 토양 염농도 및 생육특성 등을 조사하여 관수량에 의한 재염화 억제효과를 알아보고자 수행하였다. 수확기의 표토의 평균 토양 EC 는 1.5 및 3.0mm·day<SUP>-1</SUP> 처리구에서 각각 10.9 및 11.5dS·m<SUP>-1</SUP>였으며 6.0mm·day<SUP>-1</SUP> 처리구에서 5.1dS·m<SUP>-1</SUP>로 1.5 및 3.0mm·day<SUP>-1</SUP> 처리구보다 52~56% 낮게 나타나 점적관수량에 따른 제염효과를 확인할 수 있었다. 화뢰의 무게는 6.0mm·day<SUP>-1</SUP> 처리구에서 주당 371.3g으로 1.5 및 3.0mm·day<SUP>-1</SUP> 처리구의 60.9g 및 129.1g보다 높은 값을 나타냈다. 50%의 수량감소를 보이는 토양 EC는 7.6dS·m<SUP>-1</SUP>였으며 점적관수에 의한 토양 제염효과는 6.0mm·day<SUP>-1</SUP> 처리에서 30~40cm 깊이까지 나타났다. 따라서 새만금간척지에서 녹색꽃양배추 재배시 점적관수에 의한 토양 재염화 억제를 위해서는 6.0mm·day<SUP>-1</SUP> 수준의 관수량으로 총 422mm의 물량이 필요할 것으로 예측된다. 그러나 염류의 이동은 토양 이화학적 특성 및 계절적 요인 등 여러 가지 환경요인에 영향을 받으므로 간척지 비닐하우스에서 점적관수에 따른 염류의 이동특성에 관한 추가적인 연구가 필요할 것으로 판단된다. The objective of this study was to investigate the effect of drip irrigation level on soil salinity and growth of broccoli (Brassica oleracea L. var. italica) at the ‘Saemangeum Reclaimed Tidal Land’ from April to June, 2015. Drip irrigation was conducted at 1.5, 3.0 and 6.0mm·day<SUP>-1</SUP> level for reduction of resalinization in the plastic vinyl house using 10cm spacing drip irrigation tape. At harvesting stage, the average EC of surface soil was 10.9dS·m<SUP>-1</SUP> for 1.5mm·day<SUP>-1</SUP>, 11.5dS·m<SUP>-1</SUP> for 3.0mm·day<SUP>-1</SUP> and 5.1dS·m<SUP>-1</SUP> for 6.0mm·day<SUP>-1</SUP> and was significantly reduced by 52~56% in 6.0mm·day<SUP>-1</SUP> treated plot compared to those in 1.5 and 3.0mm·day<SUP>-1</SUP> plots. The fresh bud weights of 1.5, 3.0 and 6.0mm·day<SUP>-1</SUP> treatment plots were 60.9, 129.1 and 371.3g·plant<SUP>-1</SUP>, respectively. The estimated soil EC for 50% yield reduction was 7.6dS·m<SUP>-1</SUP> and the desalinization depth by drip irrigation was 30~40cm in soil profile. The total amount of drip irrigation water was estimated to be 422mm and the daily drip irrigation level was 6.0mm·day<SUP>-1</SUP> for the prevention of resalinization during the broccoli growing period at the ‘Saemangeum Reclaimed Tidal Land’. Our results suggested that drip irrigation shows effectiveness on the lowering the soil salinity according to the drip irrigation quantity but it needs more research on this study because dynamics of salts in soil can vary with many factors such as soil physico-chemical properties and seasonal climate.
Electromechanically driven variable-focus lens based on transparent dielectric elastomer.
Son, Sang-ik,Pugal, David,Hwang, Taeseon,Choi, Hyouk Ryeol,Koo, Ja Choon,Lee, Youngkwan,Kim, Kwang,Nam, Jae-Do Optical Society of America 2012 Applied optics Vol.51 No.15
<P>Dielectric elastomers with low elastic stiffness and high dielectric constant are smart materials that produce large strains (up to 300%) and belong to the group of electroactive polymers. Dielectric elastomer actuators are made from films of dielectric elastomers coated on both sides with compliant electrode material. Poly(3,4-ethylenedioxythiophene) (PEDOT), which is known as a transparent conducting polymer, has been widely used as an interfacial layer or polymer electrode in polymer electronic devices. In this study, we propose the transparent dielectric elastomer as a material of actuator driving variable-focus lens system using PEDOT as a transparent electrode. The variable-focus lens module has light transmittance up to 70% and maximum displacement up to 450. When voltage is applied to the fabricated lens module, optical focal length is changed. We anticipate our research to be a starting point for new model of variable-focus lens system. This system could find applications in portable devices, such as digital cameras, camcorder, and cell phones.</P>
Laser-Assisted Simultaneous Patterning and Transferring of Graphene
Oh, Joon-Suk,Kim, Sang-Hoon,Hwang, Taeseon,Kwon, Hyuk-Yong,Lee, Tae Hee,Bae, Ah-Hyun,Choi, Hyouk Ryeol,Nam, Jae-Do American Chemical Society 2013 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.117 No.1
<P>The patterning of graphene has gained a great deal of attention for practical applications such as electrical devices and sensors. Here we introduce a facile, versatile, and direct patterning method for the fabrication of electrically conductive graphene patterns on a flexible plastic substrate based on the laser transmission welding technique. One of the distinctive features of the developed technique is that both the patterning and transferring processes take place simultaneously with a simple laser treatment. Selective absorption of laser and localized melting by laser-induced heat were exploited to achieve a completely isolated pattern, occurring at the interface between a laser-absorbent graphene film and a laser-transparent plastic substrate. Graphene oxide (G-O) film was treated in the same way, resulting in a reduced G-O (RG-O) pattern. In this case, deoxygenation of functional groups in G-O arose together with the patterning and transferring. We found that the intensity and the scanning rate of laser irradiation considerably affected the size and chemical structures of the pattern. Scanning electron microscopy and Raman spectroscopy were used to measure the changes of the laser-treated G-O patterns.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2013/jpccck.2013.117.issue-1/jp309382w/production/images/medium/jp-2012-09382w_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp309382w'>ACS Electronic Supporting Info</A></P>