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Fabrication of Sintered Annular Fuel Pellet for HANARO Irradiation Test
RHEE, Young Woo,KIM, Dong Joo,KIM, Jong Hun,YANG, Jae Ho,KIM, Keon Sik,KANG, Ki Won,SONG, Kun Woo Atomic Energy Society of Japan 2010 Journal of nuclear science and technology Vol.47 No.4
<P>The fabrication method of an annular pellet with highly precise diametric tolerances, same dimensions, and various sintered densities has been investigated. To examine the in-pile densification and swelling of the annular pellet, 5 different types of annular pellet were prepared for a HANARO irradiation test. In order to obtain annular fuel pellets with the same dimensions and various sintered densities, we control the green density of an annular compact, the sintering temperatures, and the sintering time. For a diametric tolerance control, we have introduced a new compaction process that combines the usual double-acting pressing and cold isostatic pressing. Annular fuel pellets with the same dimensions and various sintered densities were fabricated successfully, and all the pellets satisfied the pellet specification of the HANARO irradiation test. Sintered annular pellets show an excellent inner diametric tolerance of less than ±12 μm without an inner surface grinding.</P>
Two Cases of Syncope As The Initial Presentation of Pulmonary Embolism
Rhee, Sang Jae,Kim, Nam Ho,Choi, Young Won,Cho, Eun Young,Kweon, Kyoung Hee,Choi, Eun Kyoung,Kim, Hak Ryul,Oh, Seok Kyu,Yang, Sei Hoon,Jeong, Eun Taik,Jeong, Jin-Won,Park, Ock Kyu 圓光大學校 醫科學硏究所 2002 圓光醫科學 Vol.17 No.1
Pulmonary embolism presenting as an isolated syncopal spell can be a difficult clinical correlation to make. However, physicians must be vigilant with patients who have syncope, because this symptom may be the “forgotten sign” of life-threatening pulmonary embolism. The need for prompt diagnosis is clear, because with appropriate treatment the majority of patients may survive. We report two cases of pulmonary embolism-induced syncope and review the pathopuysiology of pulmonary embolism.
Yang, Seung-Hwan,Lee, Chun-Gu,Lee, Won-Kyu,Ashtiani, Alireza Araghi,Kim, Joon-Yong,Lee, Sang-Deok,Rhee, Joong-Yong Korean Society for Agricultural Machinery 2012 바이오시스템공학 Vol.37 No.1
Purpose: Utilizing air thermal energy during over-heated time in the greenhouse is a necessary component to save greenhouse heating costs for nighttime. However, there is no practical way to implement the related principles. Methods: In this study, a heating and cooling system which utilizes the surplus air thermal energy in a greenhouse was developed. Available air thermal energy and heating load for this experimental glasshouse were estimated based on temperature conditions of the plant growth and weather data. Results: Estimated values were 400 MJ/day for maximum surplus air thermal energy and 340 MJ/day for maximum heating energy which were target values of the design as well. The system consists of a heat pump, fan-coil units and heat storage tanks which are divided into low and high temperature tanks. Moreover, a new control logic was developed for surplus air thermal energy utilization. Conclusions: This paper explains the details of conceptual design process of the system. Results of test operations showed that the developed system performed the recovery and supply of the thermal energy according to design purposes.
Effects of Fan-Aspirated Radiation Shield for Temperature Measurement in Greenhouse Environment
Yang, Seung-Hwan,Lee, Chun-Gu,Kim, Joon-Yong,Lee, Won-Kyu,Ashtinai-Araghi, A.,Rhee, Joong-Yong Korean Society for Agricultural Machinery 2012 바이오시스템공학 Vol.37 No.4
Purpose: Provision of accurate temperature measurement is an essential element to ensure a precise control in greenhouse environment. This study was organized to compare the effects of six solar radiation shields with different shapes for temperature measurement and find the most appropriate shield for greenhouse environment. Methods: A fan-aspirated radiation shield was designed and manufactured. Using the fan-aspirated radiation shield and five other shapes i.e., the cup shape, horizontal pipe, vertical pipe, parallel boards and commercial shields, temperature measurement was conducted over the lawn surface as well as greenhouse indoor environment. The measurement height varied at 0.5, 1.0 and 1.5 m from the floor. Results: The measured temperatures by the fan-aspirated radiation shield were 1.30-$1.49^{\circ}C$ lower than the values recorded by other different-shaped shields at 1.5 m of measurement height. As the measurement height decreases, observed differences between measured temperatures of the fan-aspirated radiation shield and other shields demonstrate a declining trend. However, at low measurement heights, the radiation emitted from the bottom surface would be the source of error in temperature measurement. Conclusions: The fan-aspirated radiation shield is a required tool for exact measurement of air temperature in greenhouse temperature control.
( Yang Won Min ),( Eun Ju Ko ),( Ji Yeon Lee ),( Byung Hoon Min ),( Jun Haeng Lee ),( Jae J Kim ),( Poong Lyul Rhee ) 대한소화기기능성질환·운동학회 2014 Journal of Neurogastroenterology and Motility (JNM Vol.20 No.3
Background/Aims DA-9701 significantly improved gastric accommodation by increasing the postprandial gastric volume. In this study, we investigated how DA-9701 affects the rat gastric fundus relaxation. Methods Gastric fundus muscle strips (9 longitudinal and 7 circular muscles) were obtained from rats. Electrical field stimulation (EFS) was performed at various frequencies (1, 5, 10 and 20 Hz) and train durations (1, 5, 10 and 20 seconds) to select optimal condition for experiments. Isometric force measurements were performed in response to EFS. Peak and nadir were observed during the first 1 minute after initiation of EFS in control state and after sequential addition of atropine (1 μM), DA-9701 (0.5, 5, 25 and 50 μg), N-nitro-L-arginine (L-NNA, 100 μM), MRS2500 (1 μM) and tetrodotoxin (TTX, 1 μM) to the organ bath. Results The optimal frequency and duration of EFS to evoke nerve-mediated relaxation was determined as 5 Hz for 10 seconds. Addition of L-NNA in the presence of atropine and DA-9701 (50 μg) decreased nadir by inhibiting relaxation from -0.054 ± 0.021 g to -0.022 ± 0.015 g (P = 0.026) in longitudinal muscles. However, subsequent application of MRS2500 in the presence of atropine, DA-9701 (50 μg) and L-NNA did not affect nadir. In circular muscles, subsequent addition of L-NNA and MRS2500 in the presence of atropine and DA-9701 (50 μg) did not show significant change of nadir. Conclusions Our data suggest that the effect of DA-9701 on the rat gastric fundus relaxation is mainly mediated by nitrergic rather than purinergic pathway. (J Neurogastroenterol Motil 2014;20:318-325)
EFFECT OF $SiO_2-CaO-Cr_2O_3$ ON THE CREEP PROPERTY OF URANIUM DIOXIDE
RHEE YOUNG WOO,KANG KI WON,KIM KEON SIK,YANG JAE HO,KIM JONG HEON,SONG KUN WOO Korean Nuclear Society 2005 Nuclear Engineering and Technology Vol.37 No.3
[ $\pi$ ]The effects of silica-based additives have been investigated to improve the creep property of a $UO_2$ pellet. The additive composition, $50wt\%SiO_2-47wt{\%}CaO-3wt\%Cr_2O_3$ (SCC), was selected according to the dihedral angle and the distribution of the second phase. It was observed that the creep rate of the $0.07 wt\%$ SCC-added $UO_2$ was slower than that of the pure $UO_2$. However, the creep rate of the $0.22 wt\%$ SCC-added $UO_2$ was about 3_48 times faster than that of the pure $UO_2$, depending on the applied stress in the lower stress range. In the case of the $0.35 wt\%$ SCC-added $UO_2$, the creep rate decreased in comparison with that of the $0.22 wt\%$ SCC-added $UO_2$. The observed enhancement in the creep rate might depend on a balance between the positive role of the viscous intergranular phase and the negative roles of the additives and the grain growth.
Yang, Hae Kyung,Ham, Dong-Sik,Park, Heon-Seok,Rhee, Marie,You, Young Hye,Kim, Min Jung,Shin, Juyoung,Kim, On-You,Khang, Gilson,Hong, Tae Ho,Kim, Ji-Won,Lee, Seung-Hwan,Cho, Jae-Hyoung,Yoon, Kun-Ho Wolters Kluwer Health, Inc. All rights reserved. 2016 Transplantation Vol.100 No.2
<P>Background. Clinical application of encapsulated islet transplantation is hindered by low biocompatibility of capsules leading to pericapsular fibrosis and decreased islet viability. To improve biocompatibility, we designed a novel chitosan-coated alginate capsules and compared them to uncoated alginate capsules. Methods. Alginate capsules were formed by crosslinking with BaCl2, then they were suspended in chitosan solution for 10 minutes at pH 4.5. Xenogeneic islet transplantation, using encapsulated porcine islets in 1,3-galactosyltransferase knockout mice, and allogeneic islet transplantation, using encapsulated canine islets in beagles, were performed without immunosuppressants. Results. The chitosan-alginate capsules showed similar pore size, islet viability, and insulin secretory function compared to alginate capsules, in vitro. Xenogeneic transplantation of chitosan-alginate capsules demonstrated a trend toward superior graft survival (P = 0.07) with significantly less pericapsular fibrosis (cell adhesion score: 3.77 +/- 0.41 vs 8.08 +/- 0.05; P < 0.001) compared to that of alginate capsules up to 1 year after transplantation. Allogeneic transplantation of chitosan-alginate capsules normalized the blood glucose level up to 1 year with little evidence of pericapsular fibrotic overgrowth on graft explantation. Conclusions. The efficacy and biocompatibility of chitosan-alginate capsules were demonstrated in xenogeneic and allogeneic islet transplantations using small and large animal models of diabetes. This capsule might be a potential candidate applicable in the treatment of type 1 diabetes mellitus patients, and further studies in nonhuman primates are required.</P>
( Yang Won Min ),( Jin Hee Lee ),( Byung Hoon Min ),( Jun Haeng Lee ),( Jae J Kim ),( Poong Lyul Rhee ) 대한소화기기능성질환·운동학회 2014 Journal of Neurogastroenterology and Motility (JNM Vol.20 No.2
Background/AimsThe occurrence of gastroesophageal reflux disease (GERD) is known to be associated with lower post-treatment lower esophagealsphincter pressure in patients with achalasia. This study aimed to elucidate whether GERD after pneumatic balloon dilatation(PD) has a prognostic role and to investigate how the clinical course of GERD is. MethodsA total of 79 consecutive patients who were first diagnosed with primary achalasia and underwent PD as an initial treatmentwere included in this retrospective study. Single PD was performed using a 3.0 cm balloon. The patients were divided into twogroups: 1) who developed GERD after PD (GERD group) and 2) who did not develop GERD after PD (non-GERD group). GERDwas defined as pathological acid exposure, reflux esophagitis or typical reflux symptoms. ResultsTwenty one patients (26.6%) developed GERD after PD during follow-up. There were no significant differences between thetwo groups in demographic or clinical factors including pre- and post-treatment manometric results. All patients in GERDgroup were well responsive to maintenance proton pump inhibitor therapy including on demand therapy or did not requiremaintenance. During a median follow-up of 17.8 months (interquartile range, 7.1-42.7 months), achalasia recurred in 15 patients(19.0%). However, the incidence of recurrence did not differ according to the occurrence of GERD after PD. ConclusionsGERD often occurs after even a single PD for achalasia. However, GERD after PD is well responsive to PPI therapy. Our datasuggest that GERD after PD during follow-up does not appear to have a prognostic role.