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ENTROPY OF THE FRW UNIVERSE BASED ON THE GENERALIZED UNCERTAINTY PRINCIPLE
KIM, WONTAE,PARK, YOUNG-JAI,YOON, MYUNGSEOK World Scientific 2010 Modern Physics Letters A Vol.25 No.15
<P> The statistical entropy of the FRW universe described by time-dependent metric is newly calculated using the brick wall method based on the general uncertainty principle with the minimal length. We can determine the minimal length with the Planck scale to obtain the entropy proportional to the area of the cosmological apparent horizon. </P>
3D Inspection by Registration of CT and Dual X-ray Images
Kim, Youngjun,Kim, Wontae,Lee, Deukhee International Society for Simulation Surgery 2016 Journal of International Society for Simulation Su Vol.3 No.1
Computed tomography (CT) can completely digitize the interior and the exterior of nearly any object without any destruction. Generally, the resolution for industrial CT is below a few microns. The industrial CT scanning, however, has a limitation because it requires long measuring and processing time. Whereas, 2D X-ray imaging is fast. In this paper, we propose a novel concept of 3D non-destructive inspection technique using the advantages of both micro-CT and dual X-ray images. After registering the master object’s CT data and the sample objects’ dual X-ray images, 3D non-destructive inspection is possible by analyzing the matching results. Calculation for the registration is accelerated by parallel computing using graphics processing unit (GPU).
( Kim Bora ),( Lim Serah ),( Hong Wontae ),( Kim Heejung ) 정신간호학회 2019 정신간호학회지 Vol.28 No.3
Purpose: The purpose of this study was to examine mediating effects of pleasurable activities on the relationship between depression and suicidal ideation among the elderly moderated by living arrangement such as those living alone (LA) versus those living with others (LWO). Methods: This study is a cross-sectional and correlational design using secondary data analysis of the 2017 Korean National Survey on the Elderly (2,416 for the LA group, and 6,106 for the LWO group). Logistic regression analysis was conducted comparing effects of pleasurable activities on suicidal ideation between the two groups. Results: For suicidal ideation, there were significant differences in suicidal ideation by sex, religion, and senior center visits in the LA group, while the LWO group had no significant differences identified. Both groups showed significantly different associations of suicidal ideation by socioeconomic status, gathering, meaningful interaction, and depression. Senior center visits were statistically significant in the LA group, while there was not significant in the LWO group. Conclusion: Visiting senior centers can reduce suicidal ideation of the LA group. To prevent suicidal ideation of the elderly living alone, mental health specialists should provide community-cooperative environments to address these issues, especially LA elderly.
Outcome of total proctocolectomy with ileal pouch - anal anastomosis for ulcerative colitis
Wontae Cho,Yong Beom Cho,Jin Yong Kim,Dong Kyung Chang,Young-Ho Kim,Hee Cheol Kim,Seong Hyeon Yun,Woo Yong Lee,Ho-Kyung Chun 대한외과학회 2012 Annals of Surgical Treatment and Research(ASRT) Vol.83 No.3
Purpose: We evaluated the risk factors for late complications and functional outcome after total proctocolectomy (TPC) with ileal pouch-anal anastomosis (IPAA) for ulcerative colitis (UC). Methods: Pre- and postoperative clinical status and follow- up data were obtained for 55 patients who underwent TPC with IPAA between 1999 and 2010. The median follow-up duration was 4.17 years. Late complications were defined as those that appeared at least one month after surgery. For a functional assessment, telephone interviews were conducted using the Global Assessment of Functioning Scale. Twenty-eight patients completed the interview. Results: Late complications were found in 20 cases (36.3%), comprising pouchitis (n = 8), bowel obstruction (n = 5), ileitis (n = 3), pouch associated fistula (n = 2), and intra-abdominal infection (n = 2). The preoperative serum albumin level for patients with late complications was lower than for patients without (2.4 ± 0.5 vs. 2.9 ± 0.7, P = 0.04). Functional outcomes were not significantly associated with clinical characteristics, follow-up duration, operation indication, or late complications. Conclusion: This study demonstrated that a low preoperative albumin level could be a risk factor for late complications of TPC with IPAA. Preoperative nutritional support, especially albumin, could reduce late complications. Functional outcomes are not related to late complications.
Incidence and risk factors for herpes zoster after adult liver transplantation
Wontae Kim,Sangjin Kim,Jongwook Oh,Young Jae Jeong,Jinsoo Rhu,Kyung Sik Kim,Jisoo Lee,Gyu-Sung Choi,Jong Man Kim,Jae-Won Joh 대한외과학회 2019 Annals of Surgical Treatment and Research(ASRT) Vol.96 No.2
Purpose: Herpes zoster (HZ) is caused by reactivation of the varicella zoster virus, which occurs frequently in liver transplant recipients with impaired cellular immunity. The purpose of this study was to evaluate the incidence and risk factors for HZ after adult liver transplantation (LT). Methods: In our institution, 993 patients underwent adult LT from January 1997 to December 2013. We retrospectively analyzed the incidence rate of HZ and risk factors for HZ after LT. Results: Of 993 LT recipients, 101 (10.2%) were diagnosed with HZ. The incidence of HZ at 1, 3, 5, and 10 years was 6.6%, 9.1%, 10.0%, and 11.9%, respectively. Therefore, we observed that the incidence of HZ after LT was 16.3 per 1,000 personyears. Older age (≥50 years) at LT and mycophenolate mofetil (MMF) exposure were independent risk factors of HZ infection after adult LT. Conclusion: Patients older than 50 years or with MMF exposure are considered to be at high risk for HZ. Therefore, adult liver recipients with such factors should not be given strong immunosuppression treatments.
3D virtual simulator for breast plastic surgery
Kim, Youngjun,Lee, Kunwoo,Kim, Wontae John Wiley Sons, Ltd. 2008 Computer Animation and Virtual Worlds Vol. No.
<P>We have proposed novel 3D virtual simulation software for breast plastic surgery. Our software comprises two processes: a 3D torso modeling and a virtual simulation of the surgery result. First, image-based modeling is performed in order to obtain a female subject's 3D torso data. Our image-based modeling method utilizes a template model, and this is deformed according to the patient's photographs. For the deformation, we applied procrustes analysis and radial basis functions (RBF). In order to enhance reality, the subject's photographs are mapped onto a mesh. Second, from the modeled subject data, we simulate the subject's virtual appearance after the plastic surgery by morphing the shape of the breasts. We solve the simulation problem by an example-based approach. The subject's virtual shape is obtained from the relations between the pair sets of feature points from previous patients' photographs obtained before and after the surgery. Copyright © 2008 John Wiley & Sons, Ltd.</P>
Wontae Kim,Jungwon Choi,Hyejin Yoon,Jaewang Lee,Jin Hyun Jun 대한생식의학회 2021 Clinical and Experimental Reproductive Medicine Vol.48 No.2
Objective: Lipopolysaccharide (LPS) from Gram-negative bacteria causes poor uterine receptivity by inducing excessive inflammation at the maternal-fetal interface. This study aimed to investigate the detrimental effects of LPS on the attachment and outgrowth of various types of trophoblastic spheroids on endometrial epithelial cells (ECC-1 cells) in an in vitro model of implantation.Methods: Three types of spheroids with JAr, JEG-3, and JAr mixed JEG-3 (JmJ) cells were used to evaluate the effect of LPS on early implantation events. ECC-1 cells were treated with LPS to mimic endometrial infection, and the expression of inflammatory cytokines and adhesion molecules was analyzed by quantitative real-time polymerase chain reaction and western blotting. The attachment rates and outgrowth areas were evaluated in the various trophoblastic spheroids and ECC-1 cells treated with LPS.Results: LPS treatment significantly increased the mRNA expression of inflammatory cytokines (CXCL1, IL-8, and IL-33) and decreased the protein expression of adhesion molecules (ITGβ3 and ITGβ5) in ECC-1 cells. The attachment rates of JAr and JmJ spheroids on ECC-1 cells significantly decreased after treating the ECC-1 cells with 1 and 10 μg/mL LPS. In the outgrowth assay, JAr spheroids did not show any outgrowth areas. However, the outgrowth areas of JEG-3 spheroids were similar regardless of LPS treatment. LPS treatment of JmJ spheroids significantly decreased the outgrowth area after 72 hours of coincubation.Conclusion: An in vitro implantation model using novel JmJ spheroids was established, and the inhibitory effects of LPS on ECC-1 endometrial epithelial cells were confirmed in the early implantation process.