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( Dae Hoe Gu ),( Min Seon Park ),( Tae Jung Yun ),( Seok Bae Yoon ),( Sun Young Yim ),( Jin Yong Jung ),( Jin Dong Kim ),( Yeon Seok Seo ),( Hyung Joon Yim ),( Soon Ho Um ),( Ho Sang Ryu ),( Yun Ji Pa 대한간학회 2013 춘·추계 학술대회 (KASL) Vol.2013 No.1
Background: The use of antiviral agent has changed the prognosis of patients with hepatitis B virus (HBV)-related end stage liver disease. In these patients, therefore, a more efficient prognostic model for determining early mortality is necessary to properly select those who require liver transplantation. In this study, we aimed to develop a new prognostic model. Methods: We retrospectively analyzed a total of consecutive 194 patients with decompensated HBV-related liver cirrhosis (≥CTP score 7, ascites, or jaundice) who had initially started antiviral treatment in Korea university Anam hospital. Univariate and multivariate cox-regression modeling was used to develop a model for predicting 6-month mortality Results: The study population was predominantly male (128/194) and median age was 51 years. Antiviral agents were administered for a median of 41 months (lamivudine in 157 patients, entecavir in 37). At baseline 147 and 12 patients had ascites and encephalopathy, respectively, with a mean CTP score of 9. Twenty-one (10.8%) patients died within the first 6 months of treatment. Univariate analysis revealed that baseline variables such as age, the presence of ascites or encephalopathy, serum bilirubin, prothrombin time, albumin, Na, BUN, alkaline phosphatase, and HBV DNA levels were associated with the deaths within 6-months (all P<0.05). Among them serum bilirubin, prothrombin time, HBV DNA levels and age were found to be independent risk factors in multivariate analysis. Using these four risk factors, we developed new scoring system to predict 6-months mortality. This new prediction model showed AUROC of 0.941, higher than those of CTP score and MELD score which were 0.893 and 0.862, respectively. Conclusions: This newly developed prediction model for early mortality will be useful in selecting the candidates of urgent liver transplantation in patients with decompensated HBV-related liver cirrhosis.
Case Reports : Caroli`s disease misdiagnosed as intraductal papillary neoplasm of the bile duct
( Dae Hoe Gu ),( Min Seon Park ),( Chang Ho Jung ),( Yang Jae Yoo ),( Jae Young Cho ),( Yun Ho Lee ),( Yeon Seok Seo ),( Hyung Joon Yim ),( Soon Ho Um ),( Ho Sang Ryu ) 대한간학회 2015 Clinical and Molecular Hepatology(대한간학회지) Vol.21 No.2
Caroli’s disease is a rare autosomal-recessive disorder caused by malformation of the ductal plate during embryonic development. Although it is present at birth, Caroli’s disease is typically not diagnosed until between the second and fourth decades of life, as it was in the present patient. Here we report a rare case of Caroli’s disease limited to one liver segment, which was initially misdiagnosed as an intraductal papillary neoplasm of the bile duct. The asymptomatic patient was treated with liver segmentectomy. (Clin Mol Hepatol 2015;21:175-179)
( Dae Hoe Gu ),( Moon Young Kim ),( Yeon Seok Seo ),( Sang Gyune Kim ),( Han Ah Lee ),( Tae Hyung Kim ),( Young Kul Jung ),( Altay Kandemir ),( Ji Hoon Kim ),( Hyunggin An ),( Hyung Joon Yim ),( Jong 대한간학회 2018 Clinical and Molecular Hepatology(대한간학회지) Vol.24 No.3
Background/Aims: The most widely used method for diagnosing sarcopenia is the skeletal muscle index (SMI). Several studies have suggested that psoas muscle thickness per height (PMTH) is also effective for detecting sarcopenia and predicting prognosis in patients with cirrhosis. The aim of this study was to evaluate the optimal cutoff values of PMTH for detecting sarcopenia in cirrhotic patients. Methods: All cirrhotic patients who underwent abdominal computed tomography (CT) scan including L3 and umbilical levels for measuring SMI and transverse psoas muscle thickness, respectively, were included. Two definitions of sarcopenia were used: (1) sex-specific cutoffs of SMI (≤52.4 ㎠/㎡ in men and ≤38.5 ㎠/㎡ in women) for SMIsarcopenia and (2) cutoff of PMTH (<16.8 mm/m) for PMTH-sarcopenia. Results: Six hundred fifty-three patients were included. The average age was 53.6±10.2 years, and 499 patients (76.4%) were men. PMTH correlated well with SMI in both men and women (P<0.001). Two hundred forty-one (36.9%) patients met the criteria for SMI-sarcopenia. The best PMTH cutoff values for predicting SMI-sarcopenia were 17.3 mm/m in men and 10.4 mm/m in women, and these were defined as sex-specific cutoffs of PMTH (SsPMTH). The previously published cutoff of PMTH was defined as sex-nonspecific cutoff of PMTH (SnPMTH). Two hundred thirty (35.2%) patients were diagnosed with SsPMTH-sarcopenia, and 280 (44.4%) patients were diagnosed with SnPMTH-sarcopenia. On a multivariate Cox regression analysis, SsPMTH-sarcopenia (hazard ratio [HR], 1.944; 95% confidence interval [CI], 1.144-3.304; P=0.014) was significantly associated with mortality, while SnPMTH-sarcopenia was not (HR, 1.446; 95% CI, 0.861-2.431; P=0.164). Conclusions: PMTH was well correlated with SMI in cirrhotic patients. SsPMTH-sarcopenia was an independent predictor of mortality in these patients and more accurately predicted mortality compared to SnPMTH-sarcopenia. (Clin Mol Hepatol 2018;24:319-330)
Caroli’s disease misdiagnosed as intraductal papillary neoplasm of the bile duct
Dae Hoe Gu,Min Seon Park,Chang Ho Jung,Yang Jae Yoo,Jae Young Cho,Yun Ho Lee,서연석,Hyung Joon Yim,Soon Ho Um,Ho Sang Ryu 대한간학회 2015 Clinical and Molecular Hepatology(대한간학회지) Vol.21 No.2
Caroli’s disease is a rare autosomal-recessive disorder caused by malformation of the ductal plate during embryonic development. Although it is present at birth, Caroli’s disease is typically not diagnosed until between the second and fourth decades of life, as it was in the present patient. Here we report a rare case of Caroli’s disease limited to one liver segment, which was initially misdiagnosed as an intraductal papillary neoplasm of the bile duct. The asymptomatic patient was treated with liver segmentectomy. (Clin Mol Hepatol 2015;21:175-179)
LIMIT SETS AND PROLONGATIONAL LIMIT SETS IN DYNAMICAL POLYSYSTEMS
Gu, Yoon-Hoe,Ry, Dae-Hee Korean Society of Mathematical Education 1995 純粹 및 應用數學 Vol.2 No.2
In stability theory of polysystems two concepts that playa very important role are the limit set and the prolongational limit set. For the above two concepts, A.Bacciotti and N.Kalouptsidis studied their properties in a locally compact metric space [2]. In this paper we investigate their results in c-first countable space which is more a general space than a metric space.(omitted)
임펄스전압에 의한 반구형 전극계에서 토양의 이온화 현상
허대민,김회구,이복희,Heo, Dae-min,Kim, Hoe-gu,Lee, Bok-hee 한국전력공사 2016 KEPCO Journal on electric power and energy Vol.2 No.4
접지전극이 매설되는 토양의 전기적 특성은 지역, 계절, 환경적 요인에 따라 저항률이 다양하게 변화한다. 접지전극 주변에서의 전기적 방전현상은 매우 다르게 발생하고, 이는 접지의 성능에 큰 영향을 미친다. 접지시스템의 설계 시에 다양한 조건에서 토양의 방전 특성과 이온화 현상에 관한 분석이 필요하다. 본 연구의 목적은 토양의 이온화 현상과 과도접지임피던스의 상관관계를 파악하는데 있다. 본 논문에서는 뇌임펄스전압에 의해 접지극 주변에서 발생하는 토양의 이온화 작용과 관련된 파라미터와 과도적인 접지저항에 관한 실험적 연구결과를 기술하였다. The electrical characteristics of the soil where a ground electrode is buried vary with regions, seasons and environmental factors. Electrical discharge in the vicinity of the ground electrode will occur differently and significantly affect the performance of the grounding system. It is necessary to analyze discharge and ionization characteristics of soils when the grounding system is designed. The aims of this investigation are to understand correlation between the soil ionization and the transient ground impedance. This paper presents the experimental results on the soil ionization parameters and the transient ground resistance due to the soil ionization around a hemispherical ground electrode stressed by lightning impulse voltages.
( Min Seon Park ),( Dae Hoe Gu ),( Tae Jung Yun ),( Seok Bae Yoon ),( Sun Young Yim ),( Jin Yong Jung ),( Jin Dong Kim ),( Yeon Seok Seo ),( Hyung Joon Yim ),( Soon Ho Um ),( Ho Sang Ryu ),( Yun Ji Pa 대한간학회 2013 춘·추계 학술대회 (KASL) Vol.2013 No.1
Background: The roadmap concept is the treatment strategy in chronic hepatitis B for switching the antiviral drug based on early virologic response. We applied this concept to telbivudine therapy. The aim of this study was to evaluate the efficacy of telbivudine based response guided treatment compared with entecavir monotherapy in chronic hepatitis B hepatitis patients. Methods: We included 261 consecutive patients with previously untreated chronic hepatitis B in two treatment groups : entecavir monotherapy group (n=159) and telbivudine based response guided treatment group (n=102). The telbivudine group was then divided into two subgroups depending on whether to switch entecavir based on the serum hepatitis B virus (HBV) DNA level(>20 IU/mL or not) after 6 months of treatment. Serial HBV DNA level ware checked at baseline and every 3month. Results: A total of 261 patients were enrolled in this study: 159 men and 102 women, with mean age of 47.2 years. The baseline demographics and characteristics associated underlying liver disease in the 2 treatment groups were well balanced. Among 102 patients on telbivudine, 65 had undetectable HBV DNA after 6 months and continued telbivudine monotherapy. 37 had incomplete virological response and they switched to entecavir monotherapty at 6 months. Cumulative virological response rates (75.0% vs. 73.2% at 12 months, P=0.507) and cumulative biochemical response rate (77.3% vs. 87.4%, P=0.066) were not significantly different between telbivudine based response guided treatment group and entecavir monotherapy group. However, cumulative viral breakthrough developed only in telbivudine based response-guided treatment group (12% vs. 0% at 24 months, P=0.000). Conclusions: This study showed that telbivudine based response- guided antiviral treatment in patients with chronic hepatitis B did not suppress virologic breakthrough compared to entecavir monotherapy from the beginning of treatment.