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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, 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.
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.
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)
Error Concealment Based on Multiple Representation for Wireless Transmission of JPEG2000 Image
Yang Ou,Won-Young Lee(이원영),Taeuk Yang(양태욱),Sung Taek Chee(지성택),Kyung Hyune Rhee(이경현) 한국통신학회 2008 韓國通信學會論文誌 Vol.33 No.1C
The transmission of multimedia information over error-prone channels such as wireless networks has become an important area of research. In this paper, we propose two Error Concealment (EC) schemes for wireless transmission of JPEG2000 image. The Multiple Representation (MR) is employed as the preprocessing in our schemes, whereas the main error concealing operation is applied in wavelet domain at receiver side. The compressed code-stream of several subsampled versions of original image is transmitted over a single channel with random bit errors. In the decoder side, the correctly reconstructed wavelet coefficients are utilized to recover the corrupted coefficients in other sub-images. The recovery is carried out by proposed basic (MREC-BS) or enhanced (MREC-ES) methods, both of which can be simply implemented. Moreover, there is no iterative processing during error concealing, which results a big time saving. Also, the simulation results confirm the effectiveness and efficiency of our proposed schemes.
( Yang Won Min ),( Yong Woon Shin ),( Gab Jin Cheon ),( Kyung Sik Park ),( Hyun Soo Kim ),( Chong Il Sohn ),( Tae Nyeun Kim ),( Hyeung Cheol Moon ),( Poong Lyul Rhee ) 대한소화기기능성질환·운동학회 2016 Journal of Neurogastroenterology and Motility (JNM Vol.22 No.1
Background/Aims Limited data exist on the outcome of gastroesophageal reflux disease (GERD) treatment and its impact on the health-related quality of life (HRQoL) in the Asian population. This study aims to evaluate the treatment outcomes, to investigate the factors associated with recurrence, and to evaluate the impact of the treatment outcome on the HRQoL in a Korean GERD population. Methods This was a prospective, multicenter study involving a total of 824 GERD patients. The response to treatment was assessed at week 4 (or week 8 for the patients who did not achieve complete resolution [CR] at week 4). The EQ-5D questionnaire was used at baseline, end of treatment, and first recurrence to assess the HRQoL. To assess GERD symptoms, contact of patients by phone at 1, 6, and 12 months following treatment was carried out. Results CR was achieved in 65.6% and recurrence was observed in 47.8% following treatment. CR and recurrence rates did not differ by the presence of esophagitis. Multivariate analysis revealed that acid regurgitation (odds ratio 2.249; 95% confidence interval 1.293-3.912; P = 0.004) and both acid regurgitation and heartburn (odds ratio 2.330; 95% confidence interval 1.392-3.901; P = 0.001) were independent risk factors for GERD recurrence. EQ-5D scores were more improved in patients with CR than in those without CR, and worsened more during follow-up in patients with recurrence than in those without recurrence. Conclusions We should achieve complete symptom relief and attempt to prevent recurrence in GERD patients to improve their HRQoL. (J Neurogastroenterol Motil 2016;22:86-93)