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Jinho Chae,Dong Young Kim,Sujung Kim,강미숙 한국공업화학회 2010 Journal of Industrial and Engineering Chemistry Vol.16 No.6
This study examined the photoelectric conversion efficiency of DSSC (dye-sensitized solar cell) when nanometer sized Ga (0.25, 0.50, and 1.00 mol%)–TiO2 prepared using a hydrothermal method was employed as a working electrode material. The particle sizes observed in the transmission electron microscopy images were <20 nm in all samples. However, with increasing Ga concentration, the size increased and the shapes transformed to a stick form. The absorption band was slightly blue-shifted upon the incorporation of galliumions, but the intensity of the photoluminescence (PL) curves of the Gaincorporated TiO2 was significantly smaller, with the smallest case being the 0.50 mol% Ga–TiO2, which was related to recombination between the excited electrons and holes. When Ga–TiO2 was applied in DSSC, the energy conversion efficiency was enhanced considerably compared to that using pure TiO2; it was approximately 4.57% with the N3 dye under 100 mW/cm2 of simulated sunlight. These results are in agreement with an electrostatic force microscopy (EFM) study showing that the electrons were transferred rapidly to the surface of Ga–TiO2 film, compared with that on a pure TiO2 film. 2010 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
Jinho Chae,Won-Duk Yoon,ByeongHo Kim,Jang-Seu Ki 한국동물분류학회 2017 Animal Systematics, Evolution and Diversity Vol.33 No.1
We firstly described a box jellyfish, Carybdea brevipedalia collected from the southern coasts of Korea. It is morphologically characterized by gastric phacellae, a special digestive system of cubozoan jellyfish, and velarium, the thin muscle flap forming the opening of the subumbrellar cavity. The phacellae are linear-shaped, comprising numerous cirri branched from multiple roots. Each root also has multiple numbers of cirrus bundles. Basis of velarial cannels parts into two branches in each octant of velarium. Its geographic distributions were limited to Jejudo and the middle-southern coasts where the organisms are seriously hazardous to bathers in summer. Numerous individuals and/or large-sized populations were observed specifically from beaches at Jeju-do, Namhae-do and a small fishing port of Namildae, while only a small amount of the individuals was observed in Gamak Bay, Jaran- Goseung Bay, and Geoje-do. We confirmed molecular identity of the Korean C. brevipedalia with comparison of nuclear ribosomal DNA sequences. Until now, Carybdea brevipedalia is the only cubozoan species reported to be distributed in Korean waters.
Chae, Jinho,Yoon, Won-Duk,Kim, ByeongHo,Ki, Jang-Seu The Korean Society of Systematic Zoology 2017 Animal Systematics, Evolution and Diversity Vol.33 No.1
We firstly described a box jellyfish, Carybdea brevipedalia collected from the southern coasts of Korea. It is morphologically characterized by gastric phacellae, a special digestive system of cubozoan jellyfish, and velarium, the thin muscle flap forming the opening of the subumbrellar cavity. The phacellae are linear-shaped, comprising numerous cirri branched from multiple roots. Each root also has multiple numbers of cirrus bundles. Basis of velarial cannels parts into two branches in each octant of velarium. Its geographic distributions were limited to Jeju-do and the middle-southern coasts where the organisms are seriously hazardous to bathers in summer. Numerous individuals and/or large-sized populations were observed specifically from beaches at Jeju-do, Namhae-do and a small fishing port of Namildae, while only a small amount of the individuals was observed in Gamak Bay, Jaran-Goseung Bay, and Geoje-do. We confirmed molecular identity of the Korean C. brevipedalia with comparison of nuclear ribosomal DNA sequences. Until now, Carybdea brevipedalia is the only cubozoan species reported to be distributed in Korean waters.
Jinho Chae,Juhyun Lee,정종화,강미숙 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.2
This study investigated the production of hydrogen over Ga (1.0, 2.0, and 5.0 mol%)-TiO2 photocatalysts prepared by a solvothermal method. The absorption band was slightly blue-shifted upon the incorporation of the gallium ions, but the intensity of the photoluminescence (PL) curves of Ga-incorporated TiO2s was distinguishably smaller, with the smallest case being the 2.0 mol% Ga-TiO2, which was related to the recombination between the excited electrons and holes. H2 evolution from photo splitting of water over Ga-incorporated TiO2 in the liquid system was enhanced, compared to that over pure TiO2; particularly, the production of 5.6 mL of H2 gas after 8 h when 1.5 g of the 2.0 mol% Ga-incorporated TiO2 was used.
The prevalence of causative agents of calf diarrhea in Korean native calves
( Jeong-Byoung Chae ),( Hyeon-Cheol Kim ),( Jun-Gu Kang ),( Kyoung-Seong Choi ),( Joon-Seok Chae ),( Do-Hyeon Yu ),( Bae-Keun Park ),( Yeon-su Oh ),( Hak-jong Choi ),( Jinho Park ) 한국축산학회(구 한국동물자원과학회) 2021 한국축산학회지 Vol.63 No.4
Infectious calf diarrhea is one of the most significant diseases of neonatal calves. This study is conducted to identify the prevalence of pathogens in calf diarrhea for 2 years. A total of 544 feces samples from Korean native beef calves were obtained to investigate selected seven pathogens causing calf diarrhea: bovine rotavirus, bovine coronavirus, Cryptosporidium parvum, bovine viral diarrhea virus, Eimeria species, Escherichia coli K99, and Salmonella species. The presence of diarrhea, the number and species of detected pathogens, and the calves’ ages were analyzed using various statistical methods depending on the case. Of the 544 calves, 340 calves (62.5%) had normal feces and 204 calves (37.5%) had diarrhea. The presence of pathogens was significantly associated with diarrhea (p < 0.01) and fecal scores and the number of detected pathogens showed a significant linear trend (p < 0.001). Of the 7 target pathogens, 6 were detected in samples, but only C. parvum (p = 0.001) and bovine rotavirus (p < 0.001) were found at significantly higher rates in diarrheic calves than in non-diarrheic calves. Only Eimeria spp. showed a significant linear trend between the detection rate of the pathogen and the age groups (p < 0.05).
An External Dose Assessment of Worker during RadWaste Treatment Facility Decommissioning
Chae, San,Park, Seungkook,Park, Jinho,Min, Sujung,Kim, Jongjin,Lee, Jinwoo The Korean Association for Radiation Protection 2020 방사선방어학회지 Vol.45 No.2
Background: Kori unit #1 is permanently shut down after a 40-year lifetime. The Nuclear Safety and Security Commission recommends establishing initial decommissioning plans for all nuclear and radwaste treatment facilities. Therefore, the Korea Atomic Energy Research Institute (KAERI) must establish an initial and final decommissioning plan for radwaste-treatment facilities. Radiation safety assessment, which constitutes one chapter of the decommissioning plan, is important for establishing a decommissioning schedule, a strategy, and cost. It is also a critical issue for the government and public to understand. Materials and Methods: This study provides a method for assessing external radiation dose to workers during decommissioning. An external dose is calculated following each exposure scenario, decommissioning strategy, and working schedule. In this study, exposure dose is evaluated using the deterministic method. Physical characterization of the facility is obtained by both direct measurement and analysis of the drawings, and radiological characterization is analyzed using the annual report of KAERI, which measures the ambient dose every month. Results and Discussion: External doses are calculated at each stage of a decommissioning strategy and found to increase with each successive stage. The maximum external dose was evaluated to be 397.06 man-mSv when working in liquid-waste storage. To satisfy the regulations, working period and manpower must be managed. In this study, average and cumulative exposure doses were calculated for three cases, and the average exposure dose was found to be about 17 mSv/yr in all the cases. Conclusion: For the three cases presented, the average exposure dose is well below the annual maximum effective dose restriction imposed by the international and domestic regulations. Working period and manpower greatly affect the cost and entire decommissioning plan; hence, the chosen option must take account of these factors with due consideration of worker safety.
Park, Chae Hee,Lee, Chang Min,Choi, Jong Won,Park, Geun Chul,Joo, Jinho Elsevier 2018 Ceramics international Vol.44 No.2
<P><B>Abstract</B></P> <P>To improve the photocatalytic performance of anatase TiO<SUB>2</SUB> (a-TiO<SUB>2</SUB>), it is necessary to simultaneously increase its crystallinity and surface area. Our approach to achieve the desired morphology is to develop a porous single crystal that can be transformed from its mesocrystal form via annealing. We synthesized a-TiO<SUB>2</SUB> mesocrystals onto multiwalled CNTs using a facile one-pot chemical approach, and investigated the effect of the annealing temperature (200–600°C) on the crystallinity, morphology, chemical bonding state, and photocatalytic performance of the TiO<SUB>2</SUB>/CNT composites. The as-grown sample and sample annealed at 200°C consisted of spindle-like a-TiO<SUB>2</SUB> mesocrystals. As the annealing temperature increased to 400°C, the morphology of a-TiO<SUB>2</SUB> changed from mesocrystals into porous single crystals and the surface area enlarged due to the thermo-decomposition of organic residues between the subunits. The chemical bonding (Ti–O–C) between TiO<SUB>2</SUB> and CNT was also strengthened with increasing annealing temperature. On the other hand, the TiO<SUB>2</SUB> was separated from the CNT at 600°C because of the large difference in the thermal expansion coefficients. The photocatalytic performance of the TiO<SUB>2</SUB>/CNT composites was the highest at 400°C due to the increased crystallinity, removal of the by-products, and strengthened Ti–O–C bonds, resulting in an increase in the photocatalytic active sites and efficient charge separation.</P>