http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Conceptual design of thorium based epithermal spectrum reactor
Choi, Hong Yeop,Park, Chang Je Elsevier 2017 Annals of nuclear energy Vol.109 No.-
<P><B>Abstract</B></P> <P>The concept of the epithermal spectrum nuclear core by using thorium fuel is proposed newly in order to maximize thorium breeding capability. By changing lattice size of fuel rod in the typical light water reactors, less moderation is possible and epithermal neutron spectra are achieved. In order to check the feasibility of the epithermal reactor, the fuel lattice analysis has been carried out by using the NEWT code and MCNP6 code including depletion calculation. Additional test for epithermal reactor is performed from a fast reactor by introducing a new fuel composition such as ThUZrH<SUB>x</SUB>. Due to small contents of hydrogen, the fast neutron spectrum is easily shifted to the epithermal region. Thorium epithermal core analysis is also carried out extending to 100MWt power including some safety parameters such as void reactivity and Doppler coefficient.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The concept of the epithermal spectrum core by using thorium fuel is proposed newly in order to increase breeding capability. </LI> <LI> By changing lattice size of fuel rod in the typical light water reactors, less moderation is possible and epithermal neutron spectra are achieved. </LI> <LI> From fast reactor, epithermal spectrum is obtained by introducing a new fuel composition containing hydride. </LI> <LI> Thorium epithermal core is analyzed with some safety parameters such Doppler coefficient and coolant void coefficient. </LI> </UL> </P>
Ju Young Son,Jung Hyun Jo,Jin Choi,Bang-Yeop Kim,Joh-Na Yoon,Hong-Suh Yim,Young-Jun Choi,Sun-Youp Park,Young Ho Bae,Young Ho Bae,Dong-Goo Roh,Jang-Hyun Park,Ji-Hye Kim 한국우주과학회 2015 Journal of Astronomy and Space Sciences Vol.32 No.3
We estimated the orbit of the Communication, Ocean and Meteorological Satellite (COMS), a Geostationary Earth Orbit (GEO) satellite, through data from actual optical observations using telescopes at the Sobaeksan Optical Astronomy Observatory (SOAO) of the Korea Astronomy and Space Science Institute (KASI), Optical Wide field Patrol (OWL) at KASI, and the Chungbuk National University Observatory (CNUO) from August 1, 2014, to January 13, 2015. The astrometric data of the satellite were extracted from the World Coordinate System (WCS) in the obtained images, and geometrically distorted errors were corrected. To handle the optically observed data, corrections were made for the observation time, light-travel time delay, shutter speed delay, and aberration. For final product, the sequential filter within the Orbit Determination Tool Kit (ODTK) was used for orbit estimation based on the results of optical observation. In addition, a comparative analysis was conducted between the precise orbit from the ephemeris of the COMS maintained by the satellite operator and the results of orbit estimation using optical observation. The orbits estimated in simulation agree with those estimated with actual optical observation data. The error in the results using optical observation data decreased with increasing number of observatories. Our results are useful for optimizing observation data for orbit estimation.
Proteomic Characterization of the Outer Membrane Vesicle of <i>Pseudomonas putida</i> KT2440
Choi, Chi-Won,Park, Edmond Changkyun,Yun, Sung Ho,Lee, Sang-Yeop,Lee, Yeol Gyun,Hong, Yeonhee,Park, Kyeong Ryang,Kim, Sang-Hyun,Kim, Gun-Hwa,Kim, Seung Il American Chemical Society 2014 JOURNAL OF PROTEOME RESEARCH Vol.13 No.10
<P>Outer membrane vesicles (OMVs) are produced by various pathogenic Gram-negative bacteria such as <I>Escherichia coli</I>, <I>Pseudomonas aeruginosa</I>, and <I>Acinetobacter baumannii</I>. In this study, we isolated OMVs from a representative soil bacterium, <I>Pseudomonas putida</I> KT2440, which has a biodegradative activity toward various aromatic compounds. Proteomic analysis identified the outer membrane proteins (OMPs) OprC, OprD, OprE, OprF, OprH, OprG, and OprW as major components of the OMV of <I>P. putida</I> KT2440. The production of OMVs was dependent on the nutrient availability in the culture media, and the up- or down-regulation of specific OMPs was observed according to the culture conditions. In particular, porins (e.g., benzoate-specific porin, BenF-like porin) and enzymes (e.g., catechol 1,2-dioxygenase, benzoate dioxygenase) for benzoate degradation were uniquely found in OMVs prepared from <I>P. putida</I> KT2440 that were cultured in media containing benzoate as the energy source. OMVs of <I>P. putida</I> KT2440 showed low pathological activity toward cultured cells that originated from human lung cells, which suggests their potential as adjuvants or OMV vaccine carriers. Our results suggest that the protein composition of the OMVs of <I>P. putida</I> KT2440 reflects the characteristics of the total proteome of <I>P. putida</I> KT2440.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jprobs/2014/jprobs.2014.13.issue-10/pr500411d/production/images/medium/pr-2014-00411d_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/pr500411d'>ACS Electronic Supporting Info</A></P>
Choi, Chi-Hoon,Yi, Kyung Sik,Lee, Sang-Rae,Lee, Youngjeon,Jeon, Chang-Yeop,Hwang, Jinwoo,Lee, Chulhyun,Choi, Sung Sik,Lee, Hong Jun,Cha, Sang-Hoon SAGE Publications 2018 Journal of cerebral blood flow and metabolism Vol.38 No.8
<P> To assess hyperacute focal cerebral ischemia in rats on 3.0-Tesla diffusion-weighted imaging (DWI), we developed a novel voxel-wise lesion segmentation technique that overcomes intra- and inter-subject variation in apparent diffusion coefficient (ADC) distribution. Our novel technique involves the following: (1) intensity normalization including determination of the optimal type of region of interest (ROI) and its intra- and inter-subject validation, (2) verification of focal cerebral ischemic lesions at 1 h with gross and high-magnification light microscopy of hematoxylin-eosin (H&E) pathology, (3) voxel-wise segmentation on ADC with various thresholds, and (4) calculation of dice indices (DIs) to compare focal cerebral ischemic lesions at 1 h defined by ADC and matching H&E pathology. The best coefficient of variation was the mode of the left hemisphere after normalization using whole left hemispheric ROI, which showed lower intra- (2.54 ± 0.72%) and inter-subject (2.67 ± 0.70%) values than the original. Focal ischemic lesion at 1 h after middle cerebral artery occlusion (MCAO) was confirmed on both gross and microscopic H&E pathology. The 83 relative threshold of normalized ADC showed the highest mean DI (DI = 0.820 ± 0.075). We could evaluate hyperacute ischemic lesions at 1 h more reliably on 3-Tesla DWI in rat brains. </P>
도서형 동맥피판의 생존에 대한 Chemical Leech의 효과
최태엽,심영기,이세일,홍인표 大韓成形外科學會 1992 Archives of Plastic Surgery Vol.19 No.1
A good circulatory balance between arterial inflow and venous outflow is vital in the success of replantation of amputated digits or free flap transfers. However, under some circumstances, it is not easy to anastomose the vein after arterial sutures. Several methods have been tried to enhance the survival of the replanted finger when veins were difficult to anastomose. In 1989 Barnett et al experienced three successful cases of digital replantation without venous anastomosis by injecting the calcium heparin subcutaneously into the replasnts at intervals over 9 days, and they called it 'chemical leech'. The objective of this study is to identify the effect of chemical leech in the rabbit. 14 rabbits were used as the experimental animals in the present study and were divided into 2 surgical groups. Each animal was anesthetized with intramuscular ketamine. Arterialized island flaps where vascular pedicles were composed of a central auricular artery and denuded ear cartilage were elevated. The chemical leech applied the rt. ear and It. ear was the control. The results were obtained after observation of 14 rabbits for 7 days. 1. The period from postoperative 3rd to 5th was the most critical to the survival of the flap 2. The survival rate of the chemical leech group (57.14%) was higher than that of the control group (21.42%) So we recommend this method in such various clinical situations as a replanted digits without venorrhaphy or flaps with venous insufficiency.
Min Hong,Joon-Hee Han,Sun-Yeop Lee,Da-Hye Choi,Hyeon-Ju Lee,Soo-Ung Lee,Tae-Hyung Kwon 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10
In this study, the decarboxylation conditions were optimized using the reaction surface methodology analysis method to optimize the cannabidiolic acid (CBD-A) to cannabidiol (CBD) and tetrahydrocannabinolic acid (THC-A) to tetrahydrocannabinol (THC) conversion rate. A total of 13 decarboxylated samples obtained for each condition were analyzed using HPLC. As a result, the CBD to CBD-A ratio was highest in the reaction temperature 120℃ and reaction time 140min decarboxylation conditions. The THC to THC-A ratio was the highest in the reaction temperature 90℃ and reaction time 180min decarboxylation conditions. As a result of response surface analysis (R²>0.95), the optimal decarboxylation conditions of the dependent variable that maximized the two independent variables were reaction temperature 128℃ and reaction time 52min. In the case of CBD to CBD-A ratio, the most relevant dependent variable was reaction temperature. As the reaction temperature increased, the CBD to CBD-A ratio tended to increase.