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Bang, Young Seok,Yoo, Seung Hun Elsevier 2018 Annals of nuclear energy Vol.112 No.-
<P><B>Abstract</B></P> <P>To predict the performance of the Safety Injection Tank (SIT) with Fluidic Device (FD) of APR1400 (Advance Power Reactor 1400) and its effect on Large Break Loss-of-Coolant Accident (LBLOCA) of APR1400, a model using two flow paths within the SIT is developed such that a flow path along the standpipe and a flow path through the connecting holes to mixing chamber of the FD can be simulated. A method to determine the hydraulic resistance of each flow path based on the hydrodynamic consideration is also developed. Since the method requires overall K-factor during high SIT flow phase and one during low SIT flow phase, the similarity of the hydrodynamics along the initial SIT pressure is evaluated assuming a simple isentropic process. The transition in those hydraulic resistances from the high flow phase to low flow phase are also considered in terms of K-factor of each flow path. From the course of estimating the overall K-factors, the modeling uncertainties are estimated. A good agreement with the test data and validity of the estimated uncertainty range are found from the calculation of the actual test using MARS-KS code and the present modeling. A LBLOCA of APR1400 plant is calculated using the present modeling scheme and the uncertainties of hydraulic resistance. Effect of nitrogen on cladding thermal response is discussed.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A model of the Safety Injection Tank with Fluidic Device was developed for analysis of LBLOCA of APR1400. </LI> <LI> Both the standpipe and the connecting holes to mixing chamber of Fluidic Device were simulated to be appropriate to MARS-KS code. </LI> <LI> A variable hydraulic resistance was determined at each flow path based on the hydrodynamic consideration. </LI> <LI> Introduction of the Nitrogen gas into the reactor core and its effect on cladding thermal response was discussed. </LI> </UL> </P>
유소아 개심술 환아에서 대동맥 캐뉼러의 이상위치에 의한 요골·대퇴동맥압간 차이의 발생
유은숙,이영석,박원선,한동우,방서욱,남상범,곽영란,한상건 대한마취과학회 1998 Korean Journal of Anesthesiology Vol.35 No.6
Background : Appropriate placement of aortic and venous cannulas is important to ensure effective systemic perfusion. The malposition of the aortic cannula may promote preferential flow down the aorta or induce flow to aortic arch vessels causing pressure gradient between mean radial arterial pressure (RAP) and femoral arterial pressure (FAP). In this study we compared mean radial to femoral artery pressure gradient before and immediately after aortic cannulation and during cardiopulmonary bypass (CPB). Methods : Ninety two pediatric patients undergoing open heart surgery were examined. After induction of anesthesia RAP and FAP were measured. The pressure gradient was measured before and after aortic cannulation, 15, 30 and 60 minutes after aortic cross clamping (ACC). When the pressure gradient of more than 10 mmHg developed, the surgeon was recommended to manipulate position of the aortic cannula. If the pressure gradient returned to pre-CPB level after manipulation, the pressure gradient was considered to develop due to aortic cannula. The age, presence of cyanosis, adjustment of shape of aortic cannula tip before cannulation and side of radial artery cannulation as factors developing pressure gradient were examined. Results : Fifteen patients (16.3%) developed pressure gradient due to position of aortic cannula. Two patients (2.2%) developed immediately after aortic cannulation and fourteen patients (15.2%) during CPB. There was no statistically significant factor developing pressure gradient except non-cyanotic disease. Conclusions : The pediatric patient could develop pressure gradient due to malposition of aortic cannula frequently during CPB. Therefore, the simultaneous monitoring of RAP and FAP may be beneficial for managing CPB in pediatric cardiac surgery. (Korean J Anesthesiol 1998; 35: 1124∼1128)
Sympathetic Block for Treating Primary Erythromelalgia
Bang, Yoo-Jin,Yeo, Jin-Seok,Kim, Si-Oh,Park, Young-Hoon The Korean Pain Society 2010 The Korean Journal of Pain Vol.23 No.1
Primary erythromelalgia is a rare condition that’s characterized by erythema, an increased skin temperature and burning pain in the extremities. The pain is often very severe, and treating erythromelalgia is frustrating and difficult. We report here on the case of a 12-year old girl with primary erythromelalgia in both lower extremities. The pain was refractory to medical treatment, but a bilateral sympathetic block with lidocaine and triamcinolone resulted in relief from the pain. Our experience with this disease demonstrates that sympathetic blocks are effective in improving the symptoms and they may be attempted on erythromelalgia patients who do not respond to other treatments, including medication and epidural blocks.
Augmented Quantum Yield of a 2D Monolayer Photodetector by Surface Plasmon Coupling
Bang, Seungho,Duong, Ngoc Thanh,Lee, Jubok,Cho, Yoo Hyun,Oh, Hye Min,Kim, Hyun,Yun, Seok Joon,Park, Chulho,Kwon, Min-Ki,Kim, Ja-Yeon,Kim, Jeongyong,Jeong, Mun Seok American Chemical Society 2018 NANO LETTERS Vol.18 No.4
<P>Monolayer (1L) transition metal dichalcogenides (TMDCs) are promising materials for nanoscale optoelectronic devices because of their direct band gap and wide absorption range (ultraviolet to infrared). However, 1L-TMDCs cannot be easily utilized for practical optoelectronic device applications (e.g., photodetectors, solar cells, and light-emitting diodes) because of their extremely low optical quantum yields (QYs). In this investigation, a high-gain 1L-MoS<SUB>2</SUB> photodetector was successfully realized, based on the surface plasmon (SP) of the Ag nanowire (NW) network. Through systematic optical characterization of the hybrid structure consisting of a 1L-MoS<SUB>2</SUB> and the Ag NW network, it was determined that a strong SP and strain relaxation effect influenced a greatly enhanced optical QY. The photoluminescence (PL) emission was drastically increased by a factor of 560, and the main peak was shifted to the neutral exciton of 1L-MoS<SUB>2</SUB>. Consequently, the overall photocurrent of the hybrid 1L-MoS<SUB>2</SUB> photodetector was observed to be 250 times better than that of the pristine 1L-MoS<SUB>2</SUB> photodetector. In addition, the photoresponsivity and photodetectivity of the hybrid photodetector were effectively improved by a factor of ∼1000. This study provides a new approach for realizing highly efficient optoelectronic devices based on TMDCs.</P> [FIG OMISSION]</BR>