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An Efficient Multicast Routing Algorithm for Packet-Switched Networks
Chung, Sung-Jin,Hong, Sung-Pil,Park, Bum Hwan 한국경영과학회 1998 한국경영과학회 학술대회논문집 Vol.- No.2
This paper has a dual purpose. First, we consider a relaxation algorithm which seems to be particularly suitable for multicasting routing problems. We show that the algorithm has polynomial complexity. Second, to measure the quality of solutions in comparison to the optimal solutions over a wide range of network sizes for which the computation of the optimal costs is too excessive, we also propose a random graph generation scheme in which an asymptotic lower bound on the expected optimal cost can be computed as a function of network node size.
Structural Evaluation on the Impact of a Radioisotope Package
Chung, Sung-Hwan,Lee, Heung-Young,Ku, Jeong-Hoe,Seo, Ki-Seog,Han, Hyun-Soo Korean Nuclear Society 1998 Nuclear Engineering and Technology Vol.30 No.5
A package to transport high-level radioactive materials is required to withstand normal transport and hypothetical accident conditions pursuant to the IAEA and domestic regulations. The package should maintain the structural safety not to release radioactive material in any condition. The structural safety of the package has been evaluated by tests using proto-type or scaled-down models, however, the method by analysis is gradually utilized due to recent advancement of computers and computer codes. In this paper, to evaluate the structural safety of a radioisotope package of the KAERI, the three dimensional impact analyses under 9m free drop and 1m puncture were performed with an explicit finite-element code, the LS-DYNA3D code. The maximum stress intensity on each part was calculated and the structural safety of the package was evaluated in accordance with the regulations.
Sang-Hyun Kang,Shin Hwang,Chul-Soo Ahn,Ki-Hun Kim,Deok-Bog Moon,Tae-Yong Ha,Gi-Won Song,Dong-Hwan Jung,Gil-Chun Park,Jung-Man Namgoong,Young-In Yoon,Hui-Dong Cho,Jae-Hyun Kwon,Yong-Kyu Chung,Jin Uk Ch 대한이식학회 2020 Korean Journal of Transplantation Vol.34 No.1
Background: To understand the changing demands and recent trends in the indications for living donor liver transplantation (LDLT), the present study aimed to analyze the indications for LDLT performed in a high-volume transplantation center over 10 years. Methods: The liver transplantation database at our institution was searched to identify patients who underwent LDLT during a 10-year period from January 2008 to December 2017. The study subjects (n=3,145) were divided into two groups: adult patients (n=3,019, 92.7%) and pediatric patients (n=126, 3.9%). Results: In the adult recipients, the primary diagnoses were hepatitis B virus (HBV)- associated liver cirrhosis (n=1,898, 62.9%), alcoholic liver disease (n=482, 16.0%), hepatitis C virus-associated cirrhosis (n=203, 6.7%), acute liver failure (n=127, n=4.2%), and other diseases (n=157, 5.2%). The mean Model for End-Stage Liver Disease score was 15.6±8.8 (range, 6–40). The proportion of patients with HBV-associated liver disease gradually decreased, but the proportion of those with alcoholic liver disease increased. Hepatocellular carcinoma (HCC) was diagnosed in 1,467 patients (48.6%). The mean proportion of patients with HCC was 63.1% among those with HBVassociated liver disease. In pediatric recipients, the primary diagnoses were biliary atresia (n=51, 40.5%), liver failure of various causes (n=37, 29.4%), metabolic disease (n=22, 17.5%), hepatoblastoma (n=12, 9.5%), and infectious diseases (n=4, 3.2%). Conclusions: Our results showed that there were some significant changes in the indications of LDLT. We believe that our results may reflect the real changes in the indications of LDLT and they will be useful for predicting further changes in the future.
( Sang Hun Lee ),( Hye Jung Cho ),( Eun Jin Kim ),( Young Hwan Cho ),( Jeong Ho Kim ),( Kyoung Jin Chung ),( Dong Woo Son ) 대한주산의학회 2021 Perinatology Vol.32 No.1
Extremely low birth weight infants (ELBWIs) are at high risk for candidemia, which often involves the kidneys, resulting in obstructive uropathy, for which the management is difficult and challenging. An ELBWI developed a bloodstream Candida albicans infection on the 21st day of life. Candidemia persisted after one week of fluconazole administration. Then, the antifungal agent was changed to liposomal amphotericin B (AmBisome®; LAmB). The blood culture turned negative after three days of LAmB treatment. At the end of the two-week course of LAmB, the patient showed progressive renal failure with a positive fungal culture in the urine. Bilateral obstructive renal fungal balls were identified by ultrasonography. On both sides, we placed two pairs of 5-Fr percutaneous nephrostomy (PCN) tubes (upper and lower pole tube pairs in each kidney). We started direct administration of LAmB through the upper pole tubes and let them drain through the lower pole tubes. Concomitantly, systemic LAmB levels were maintained. The urine culture turned negative after two weeks of continuous irrigation. The PCN tubes were removed sequentially following fungal ball disappearance, while irrigation was continued for seven weeks. Continuous antifungal agent irrigation through paired PCN tubes was effective in ELBWI with bilateral urinary obstruction.
Packaging Criterion for Mid-Size Sedan Based on Users' Daily-Life Scenario
Chung, Sung-Moon,Lee, Seung-Hwan,Kim, Su-Whan Korean Institute of Industrial Engineers 2012 Industrial Engineeering & Management Systems Vol.11 No.2
This study has developed a packaging criterion to minimize the level of discomfort which drivers using their vehicles for daily life purposes may experience due to ill designed vehicle packaging of mid-size sedan based on users' daily-life scenario. To find out optimal range of packaging dimension criterion, discomfort levels the test participants with different physical conditions suffer while performing various activities were analyzed. One hundred two test participants were carefully selected to represent entire Korean mid-size sedan owner-drivers. They were directed to test drive on the course designed to simulate mid-size sedan daily-usage scenario. At pre-designed locations, each of questions was asked to the test participants to be answered in the form of 10 point discomfort level score. By analyzing the test results, the optimal range for packaging dimensions was defined to be used as a packaging criterion.