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시계열 온실 환경 인자와 딸기 생육 특성간의 상관성 연구
이현규, 정동욱, 이정규, 김수아, 이동훈 忠北大學校 農業科學硏究所 2017 農業科學硏究 Vol.33 No.1
The purpose of this study is to investigate the correlation between the growth conditions of the crops and the environment of the greenhouse according to the variation of temperature inside the greenhouse. The environment sensor (i.e. temperature and humidity sensor) which were installed in the greenhouse were collected as environmental factor. The growth index of strawberry were measured to fruit length, fruit diameter, fruit weight, sugar content and yield according to the average temperature and humidity. The correlation between the environmental factors in the greenhouse and the growth index of strawberry was investigated by simple linear regression. The production of strawberry showed a slight difference in each location, but the production of strawberry was increased in the area close to the heater.
Tension assisted metal transfer of graphene for Schottky diodes onto wafer scale substrates
Lee, Jooho,Lee, Su Chan,Kim, Yongsung,Heo, Jinseong,Lee, Kiyoung,Lee, Dongwook,Kim, Jaekwan,Lee, Sunghee,Lee, Chang Seung,Nam, Min Sik,Jun, Seong Chan IOP 2016 Nanotechnology Vol.27 No.7
<P>We developed an effective graphene transfer method for graphene/silicon Schottky diodes on a wafer as large as 6 inches. Graphene grown on a large scale substrate was passivated and sealed with a gold layer, protecting graphene from any possible contaminant and keeping good electrical contact. The Au/graphene was transferred by the tension-assisted transfer process without polymer residues. The gold film itself was used directly as the electrodes of a Schottky diode. We demonstrated wafer-scale integration of graphene/silicon Schottky diode using the proposed transfer process. The transmission electron microscopy analysis and relatively low ideality factor of the diodes indicated fewer defects on the interface than those obtained using the conventional poly(methyl methacrylate)-assisted transfer method. We further demonstrated gas sensors as an application of graphene Schottky diodes.</P>
Crack-Release Transfer Method of Wafer-Scale Grown Graphene Onto Large-Area Substrates
Lee, Jooho,Kim, Yongsung,Shin, Hyeon-Jin,Lee, ChangSeung,Lee, Dongwook,Lee, Sunghee,Moon, Chang-Yul,Lee, Su Chan,Kim, Sun Jun,Ji, Jae Hoon,Yoon, Hyong Seo,Jun, Seong Chan American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.15
<P>We developed a crack-release graphene transfer technique for opening up possibilities for the fabrication of graphene-based devices. Graphene film grown on metal catalysts/SiO<SUB>2</SUB>/Si wafer should be scathelessly peeled for sequent transferring to a target substrate. However, when the graphene is grown on the metal catalyst on a silicon substrate, there is a large tensile stress resulting from the difference of the coefficient of thermal expansion in the catalyst and silicon. The conventional methods of detaching graphene from metal catalysts were found to induce considerable mechanical damage on graphene films during separation processes including metal wet etching. Here we report a new technique wherein bubbles generated by electrolysis reaction separate thin metal catalysts from the SiO<SUB>2</SUB>/Si wafer. The dry attachment of graphene to the target wafer was processed utilizing a wafer to wafer bonding technique in a vacuum. We measured the microscopic image, Raman spectra, and electrical properties of the transferred graphene. The optical and electrical properties of the graphene transferred by the bubbles/dry method are better than those of the graphene obtained by mechanical/wet transfer.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-15/am502565z/production/images/medium/am-2014-02565z_0005.gif'></P>
Dongwook Son,Pyeongjae Lee,Jongseok Lee,Sanghyun Lee,Sang Yoon Choi,Jong-Won Lee,Sun Yeou Kim 한국식품과학회 2007 Food Science and Biotechnology Vol.16 No.4
This study examined the neuroprotective effect of scopoletin from Angelica dahurica against oxygen and glucose deprivation-induced neurotoxicity in a rat organotypic hippocampal slice culture. Scopoletin reduced the propidium iodide (PI) uptake, which is an indication of impaired cell membrane integrity. In addition, it inhibited the loss of NeuN, which represents the viability of neuronal cells. The results suggests that scopoletin from A. dahurica protects neuronal cells from the damage caused by oxygen and glucose deprivation.
Spin-orbit torque engineering by orbital current in Cr-based magnetic heterostructures
Soogil Lee,Min-Gu Kang,Dongwook Go,Taekhyeon Lee,Dohyoung Kim,Geun-Hee Lee,Jun-Ho Kang,Jong-Ryul Jeong,Kyung-Jin Lee,Hyun-Woo Lee,Kab-Jin Kim,Sanghoon Kim,Byong-Guk Park 한국자기학회 2020 한국자기학회 학술연구발표회 논문개요집 Vol.30 No.1
Giant Spin-orbit Torques Induced by Orbital Hall Effect
Soogil Lee,Junho Kang,Taekhyeon Lee,Jung-Mok Kim,Dohyoung Kim,Heechan Jang,Eun Kang Park,Dongwook Go,Nyun Jong Lee,Yoshinori Kotani,Yoichi Shiota,Teruo Ono,S. Sonny Rhim,Kyung-Jin Lee,Hyun-Woo Lee,Kab 한국자기학회 2019 한국자기학회 학술연구발표회 논문개요집 Vol.29 No.2
Electric double-layer capacitor based on an ionic clathrate hydrate.
Lee, Wonhee,Kwon, Minchul,Park, Seongmin,Lim, Dongwook,Cha, Jong-Ho,Lee, Huen Wiley-VCH 2013 Chemistry, an Asian journal Vol.8 No.7
<P>Herein, we suggest a new approach to an electric double-layer capacitor (EDLC) that is based on a proton-conducting ionic clathrate hydrate (ICH). The ice-like structures of clathrate hydrates, which are comprised of host water molecules and guest ions, make them suitable for applications in EDLC electrolytes, owing to their high proton conductivities and thermal stabilities. The carbon materials in the ICH Me4NOH?5?H2O show a high specific capacitance, reversible charge-discharge behavior, and a long cycle life. The ionic-hydrate complex provides the following advantages in comparison with conventional aqueous and polymer electrolytes: 1)?The ICH does not cause leakage problems under normal EDLC operating conditions. 2)?The hydrate material can be utilized itself, without requiring any pre-treatments or activation for proton conduction, thus shortening the preparation procedure of the EDLC. 3)?The crystallization of the ICH makes it possible to tailor practical EDLC dimensions because of its fluidity as a liquid hydrate. 4)?The hydrate solid electrolyte exhibits more-favorable electrochemical stability than aqueous and polymer electrolytes. Therefore, ICH materials are expected to find practical applications in versatile energy devices that incorporate electrochemical systems.</P>