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홍장후,정택서,김운겸 서울産業大學校 1996 논문집 Vol.44 No.1
ZSM-5 catalysts were prepared from Na₂SiO₂-Al₂O₃-TPAOH-H₂O system by hydrothermal process. Catalysts showed characteristics of ZSM-5 crystal structure and composwd of various size of small twin crystals which were confirmed by X-RD and SEM analysis respectively. Methanol conversion reactions were performed by changing the reaction time, temperature, space velocity and partial pressure of the reaction system. selectivity of catalist with reaction time reaction time was increased a products of the paraffine. Temperatures was large effective than the other parameters. Space time were changed from 0.06 to 2.64[g cat-hr/g mole]highest at 1.98. Deactivated catalysts were regenerated by passing the air from 2 hours at 500℃. As the number of regeneration increased selectivity to low grade olefine.
홍장후,정택서,김운겸 서울産業大學校 1996 논문집 Vol.44 No.1
The effect of catalyst acidity and of its absorption property on the catalytic have examined for caption exchanged ZSM-5. Adsorption property of the NH₃and NO over HZSM-5 and Cu/ZSM-5 catalyst was investigated by NH₃,NO TPD. Also, room temperature adsorption and temperature-programmed desorption(TPD) of NO over a Cu/ZSM-5 catalyst active for NO decomposition were investigated. Even at 25℃ N₂O and N₂ were observed as reaction products during NO adsorption but they ceaced when NO adsorption was completed. During NO TPD N₂O , NO and O₂ desorptionpr peaks were observed. A oxygen desorption peak was detected at Ca360 ℃. No decompositive was detected without copper present. NO TPD was also collected over reduced and oxidized catalysts.
Effect of Stress on Current-Voltage Characteristics of ZnO Based Ceramics
Jung Ju-Yong,Kim Yeong-Cheol,Seo Hwa-Il,Chung Dong-Teak,Kim Young-Jung,Min Joon-Won The Korean Society Of Semiconductor Display Techno 2005 반도체디스플레이기술학회지 Vol.4 No.4
The chemical composition and uniaxial compressive stress are varied to observe their effect on the current-voltage characteristics of ZnO based ceramics. The variation of chemical composition produces two kinds of ceramics showing ohmic and nonohmic current-voltage characteristics. The current at a fixed voltage increased with the increase of the compressive stress for both ohmic and nonohmic ceramics. Ceramics showing nonohmic behavior exhibit better reversible return of current-voltage curve when the applied compressive stress is removed from the ceramics than those showing ohmic behavior do. We found an appropriate chemical composition showing linear relation between current and stress at a fixed voltage. The ceramic materials with an appropriate chemical composition can be used as a potential sensing material in pressure sensors.
Valuation of Forest Habitat Functions of Endangered Mammals Using Species Distribution Model
Jung Teak Kim,Jaeuk Kim,Woo-Kyun Lee,Seong Woo Jeon,Joon Soon Kim 강원대학교 산림과학연구소 2015 Journal of Forest Science Vol.31 No.3
It is estimated that there is a total of approximately 100,000 species in Korea. However, the number is currently about 30,000 and only 16,027 species are listed in the ‘Species Korea’ (as of December, 2014). Of the listed species, 51 species are designated as the Endangered Species Class I while 195 species are in the Class II, totaling 246 endangered species including 20 mammals. Under the circumstances that development (e.g., roads) is increasingly threatening the persistence of endangered mammals, it is significant to identify and preserve suitable habitats for them. In this context, evaluating the values of the suitable habitat environment would serve as essential information for development decision making. This study estimated the values of endangered mammals’ forest habitats through spatialization of habitat services. In doing so, a species distribution model, Maximum Entropy Model (MaxEnt) was utilized for a group of endangered mammals including, mountain goat, wildcat, marten cat, and flying squirrel. To calculate the values per unit area, a benefit transfer method was used based on the point-estimate technique with the best available values estimated previously. The range of discount rate of 3.0 to 5.5 percent was applied taking the notion of social discount rate into account. As a result, the province with the highest values for endangered mammal habitats appeared to be Gangwon, followed by Gyeongbuk and Gyeongnam. The monetary values of the endangered mammal habitats were estimated to be 330 billion to 421 billion won per year.
Kim, Seon Hoon,Kim, Tae Un,Jung, Haeng Yun,Ki, Hyun Chul,Kim, Doo Gun,Lee, Byung-Teak American Scientific Publishers 2018 Journal of Nanoscience and Nanotechnology Vol.18 No.3
<P>The surface plasmon resonance (SPR) properties of Au/Ag bimetallic thin-film nanostructures were investigated to improve the chemical stability and the figure of merit (FOM) in the SPR sensors. The SPR characteristics such as resonance angle, extinction ratio, and full width half maximum (FWHM) were calculated by the simulation of the finite-difference time-domain method and were measured using the laser with a 632.8 nm wavelength in the Kretschmann-Raether configuration. The measured resonance angle, extinction ratio, FWHM of Au(20 nm)/Ag(20 nm) thin-film nanostructure were found to be 44 degrees, 0.8, and 1.4 degrees, respectively. The FOM values were determined to be 56.9 for Au/Ag bimetallic thin-film, 47.9 for Au(50 nm) single thin-film, and 89.1 for Ag(50 nm) single thin-film. Also the sensitivity values were about 53.5, 57.0, and 57.8 degrees/RIU for Au(50 nm), Ag(50 nm), and Au(20 nm)/Ag(20 nm) thin-film nanostructures in the SPR sensors, respectively. The SPR properties of Au/Ag bimetallic thin-film nanostructures were compared with those of the Au and Ag single thin-film nanostructures.</P>
Valuation of Forest Habitat Functions of Endangered Mammals Using Species Distribution Model
Kim, Jung Teak,Kim, Jaeuk,Lee, Woo-Kyun,Jeon, Seong Woo,Kim, Joon Soon Institute of Forest Science 2015 Journal of Forest Science Vol.31 No.3
It is estimated that there is a total of approximately 100,000 species in Korea. However, the number is currently about 30,000 and only 16,027 species are listed in the 'Species Korea' (as of December, 2014). Of the listed species, 51 species are designated as the Endangered Species Class I while 195 species are in the Class II, totaling 246 endangered species including 20 mammals. Under the circumstances that development (e.g., roads) is increasingly threatening the persistence of endangered mammals, it is significant to identify and preserve suitable habitats for them. In this context, evaluating the values of the suitable habitat environment would serve as essential information for development decision making. This study estimated the values of endangered mammals' forest habitats through spatialization of habitat services. In doing so, a species distribution model, Maximum Entropy Model (MaxEnt) was utilized for a group of endangered mammals including, mountain goat, wildcat, marten cat, and flying squirrel. To calculate the values per unit area, a benefit transfer method was used based on the point-estimate technique with the best available values estimated previously. The range of discount rate of 3.0 to 5.5 percent was applied taking the notion of social discount rate into account. As a result, the province with the highest values for endangered mammal habitats appeared to be Gangwon, followed by Gyeongbuk and Gyeongnam. The monetary values of the endangered mammal habitats were estimated to be 330 billion to 421 billion won per year.
Nanostructured Multifunctional Surface with Antireflective and Antimicrobial Characteristics
Kim, Sohee,Jung, Une Teak,Kim, Soo-Kyoung,Lee, Joon-Hee,Choi, Hak Soo,Kim, Chang-Seok,Jeong, Myung Yung American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.1
<P>Functional polymeric films with antireflective and hydrophobic properties have been widely used for electronic device displays. However, the design of such functional films with an antimicrobial characteristic has been a challenge. We designed a nanostructured surface using a rigorous coupled-wave analysis to obtain a period of 300 nm and an aspect ratio of 3.0 on a flat poly(methyl methacrylate) film. The fabricated nanostructure was hydrophobic and exhibited the desired optical characteristics with a reflectance of less than 0.5% over the visible wavelength range. Furthermore, the nanoimprinted polymer film exhibited antimicrobial characteristics and low adhesion when compared with the corresponding flat surface. The results suggest that the nanostructured surface designed in this study is multifunctional and should be suitable for the production of protective optical and hygienic polymer films for the displays of portable electronic devices.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2015/aamick.2015.7.issue-1/am506254r/production/images/medium/am-2014-06254r_0006.gif'></P>
( Dae Hyun Jung ),( Hak-jin Kim ),( Jung-seok Yang ),( Ju Young Lee ),( Hyoung Seok Kim ),( Soo Hyun Park ),( Changho Jhin ),( Teak Sung Lee ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.2
The most widely used soilless techniques are container cultivation which uses a substrate that contains the nutrient solution and continuously feed to the root of the crop. Since the roots are influenced by the substrate parameters such as the water content, the electrical conductivity, and the temperature, The nutrient replenishment and irrigation strategies need to monitor the substrate status. The main objective of this work has been the development of estimation models of EC, water content, and temperature in rockwool substrate using artificial neural network based on Levenberg-Marquardt back-propagation algorithm. We set the 17 inputs for learning by collecting the irrigation and nutrient replenishment status from the hydroponic system, data from drainage solution sensors, the environmental data in the greenhouse, the output data were collected through sensors monitoring substrate. These data for training were measured every 30 s from February 04 to April 03, 2018, training accuracy (R<sup>2</sup>) of three output values were greater than 0.96. The trained neural network models predicted the substrate EC, water content and temperature of test samples, which is randomly selected for 5 days. Test accuracy (R<sup>2</sup>) was 0.92, 0.89 and 0.85 and RMSE was 1.57, 0.07 and 0.45 for water content, EC, temperature, respectively. This method can be used online in tomato cultivation to not only decrease costs related to the installation of sensors but to also make a precise nutrient solution management.