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사각 밀폐계 내 자연대류에 의한 원형 실린더의 운동 특성에 관한 수치적 연구
손성완(Seong Wan Son),정해권(Hea Kown Jeong),하만영(Man Yeong Ha),윤현식(Hyun Sik Yoon) 대한설비공학회 2010 설비공학 논문집 Vol.22 No.11
The present study numerically investigates the motion of a solid body suspended in the square enclosure with natural convection. A two-dimensional circular cylinder levitated thermally has been simulated by using thermal lattice Boltzmann method(TLBM) with the directforcing immersed boundary method. To deal with the ascending, falling or levitation of a circular cylinder in natural convection, the immersed boundary method is expanded and coupled with the TLBM. The circular cylinder is located at the bottom of a square enclosure with no restriction on the motion and freely migrates due to the Boussinesq approximation which is employed for the coupling between the flow and temperature fields. For different density ratio between the cylinder and the fluid, the motion characteristics of the circular cylinder for various Grashof numbers have been carried out. The Prandtl number is fixed as 0.7.
지수나(Chi Soo Na),고재영(Ko Jea Young),이수하(Lee Su Ha),임은화(Lim Eun Hwa),권국환(Kown Kuk Hwan),윤미선(Yoon Mi Seon),김은숙(Kim Eun Sook) 韓國營養學會 2011 Journal of Nutrition and Health Vol.44 No.5
The objective of this study was to determine the nutritional support in patients treated in medical intensive care units (MICUs) by evaluating the extent of current nutritional support using the patient care plan and considering the association between nutritional status and the amount of nutrition supplied. From April to December 2010 114 patients (age ≥ 18 years) admitted to the MICU and who underwent nutritional support for > 5 days were included. Descriptive statistics showed that the 114 patients received nutritional support within 1.2 ± 0.7 days and for 16.2 ± 11.7 days in the MICUs. The total delivered/required caloric ratio was 81.08 ± 27.31% and the protein ratio was 80.32 ± 28.93%. Patients who received > 80% of required calories and protein showed improved nutritional status (p < 0.05). The results showed that adequate nutritional support is crucial to critically ill patients. We suggest early nutritional screening using simple tools such as periodic monitoring and management to recalculate nutritional status and nutritional requirements and nutritional support using a multidisciplinary method. Systematic nutritional support teams are needed to provide adequate nutritional support for patients in the MICU.
Investigation on Beam-Blocker-Based Scatter Correction Method for Improving CT Number Accuracy
Hoyeon Lee,Jonghwan Min,Taewon Lee,Rizza Pua,Sabir, Sohail,Kown-Ha Yoon,Hokyung Kim,Seungryong Cho Professional Technical Group on Nuclear Science 2017 IEEE transactions on nuclear science Vol. No.
<P>Cone-beam computed tomography (CBCT) is gaining widespread use in various medical and industrial applications but suffers from substantially larger amount of scatter than that in the conventional diagnostic CT resulting in relatively poor image quality. Various methods that can reduce and/or correct for the scatter in the CBCT have therefore been developed. Scatter correction method that uses a beam-blocker has been considered a direct measurement-based approach providing accurate scatter estimation from the data in the shadows of the beam-blocker. To the best of our knowledge, there has been no record reporting the significance of the scatter from the beam-blocker itself in such correction methods. In this paper, we identified the scatter from the beam-blocker that is detected in the object-free projection data investigated its influence on the image accuracy of CBCT reconstructed images, and developed a scatter correction scheme that takes care of this scatter as well as the scatter from the scanned object.</P>