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리튬 이온 2차전지용 Anode 재료의 제조와 그 특성 고찰
이주성,정윤이,변지형,박은성,유덕영 한양대학교 에너지·환경기술연구소 1997 에너지·環境技術論文集 Vol.3 No.-
Carbon materials, disordered carbon and KS6(graphite, Lonza), were studied as anode materials of lithium ion secondary battery. The disordered carbons were made from thermosetting resins (phenol resin, furan resin, acetylene resin and its mixed resin). The resins were carbonized in nitrogen gas at 1000℃. When the thermosetting resins were carbonized, an addition of lithium hydroxide improved capacity and cycle life, but decreased the efficiency of the first charge/discharge. Also, in this study, the capacity of the carbon from phenol resin was higher than that of the carbon from acetylene resin or furan resin. But, the carbon from mixed resin was the highest capacity of all the synthetic carbons.
Poly(ρ-phenylenesulfide)와 Poly(ρ-phenylene)으로부터 제조된 탄소의 리튬 이온 2차전지 anode 재료로서의 전기화학적 특성
유덕영,이주성,박수길,변지형,류신환,정윤이 한양대학교 에너지·환경기술연구소 1998 에너지·環境技術論文集 Vol.4 No.-
Poly(p-phenylenesulfide)와 poly(p-phenylene)으로부터 제조된 탄소를 리튬이온 2차전지용 음극재료로 사용하여 전기화학적특성을 연구하였다. 이들 고분자들을 질소 분위기하에서 승온속도 2℃/min로 1000℃까지 상승시킨 후, 1시간 동안 탄화시켜 탄소를 제조하였다. Poly(p-phenylene)으로부터 제조된 탄소가 보다 더 규칙적인 구조를 가지기 때문에 Poly(p-phenylenesulfide)으로부터 제조된 탄소보다 더 많은 용량과 충방전 효율을 나타내었다. 수산화리튬과 염화주석(Ⅱ)을 첨가하여 용량의 증가와 충방전 효율의 증가를 가져올 수 있었다. 이중에서 poly(p-phenylene)에 염화주석(Ⅱ)을 첨가시켜 제조된 탄소가 가장 큰 충방전 용량과 충방전 효율의 향상을 가져왔다. Carbon inaterials manufactured from poly(p-phenylene sulfide) and poly(p-phenylene), were studied on electrochemical characteristics as anode materials for lithium ion secondary battery. These polymer precursors were heat treated for 1hr at 1000℃ with the rate 2℃/min under nitrogen atmosphere. Carbon manufactured from poly(p-phenylene) showed higher capacity and coulomb efficiency of charge/discharge than carbon from poly(p-phenylene sulfide) because the former has better ordered structure. Carbon manufactured from polymer precursors adding stannous chloride or lithium hydroxide showed higher capacity and better efficiency of charge/discharge. Also, carbon manufactured by adding stannous chloride to poly(p-phenylene) showed the highest capacity and efficiency of charge/discharge.
Tae Hyung Kim,윤승규,최지미,고현길,Han Ah Lee,Sun Young Yim,Seong Ji Choi,이영선,Eileen L. Yoon,Young Kul Jung,Yeon Seok Seo,Ji Hoon Kim,Hyung Joon Yim,Jong Eun Yeon,Kwan Soo Byun,엄순호 대한의학회 2020 Journal of Korean medical science Vol.35 No.19
Background: Prognosis of patients with diverse chronic diseases is reportedly associated with 25-hydroxyvitamin D levels. In this study, we investigated the potential role of 25-hydroxyvitamin D3 (25[OH]D3) levels in improving the predictive power of conventional prognostic models for patients with liver cirrhosis. Methods: We investigated clinical findings, including serum 25(OH)D3 levels at admission, of 155 patients with cirrhosis who were followed up for a median of 16.9 months. Results: Median 25(OH)D3 levels were significantly different among patients exhibiting Child-Pugh grades A, B, and C. Mortality, including urgent transplantation, was significantly associated with 25(OH)D3 levels in univariate analysis. Severe vitamin-D deficiency (serum 25[OH]D3 level < 5.0 ng/mL) was significantly related to increased mortality, even after adjusting for Child-Pugh and Model for End-stage Liver Disease (MELD) scores. In particular, the presence of severe vitamin D deficiency clearly defined a subgroup with significantly poorer survival among patients with Child-Pugh scores of 5–10 or MELD scores ≤ 20. A new combination model of MELD score and severe vitamin D deficiency showed significantly more accurate predictive power for short- and long-term mortality than MELD scores alone. Additionally, serum 25(OH)D3 levels and new model scores were significantly associated with the development of spontaneous bacterial peritonitis, overt encephalopathy, and acute kidney injury. Conclusion: Serum 25(OH)D3 level is an independent prognostic factor for patients with liver cirrhosis and has a differential impact on disease outcomes according to MELD and Child- Pugh scores.
( Ji Hoon Kim ),( Young Kul Jung ),( Eun Seok Jeong ),( Yeon Seok Seo ),( Hyung Joon Yim ),( Jong Eun Yeon ),( Jae Jeong Shim ),( Kwan Soo Byun ),( Chang Hong Lee ) The Editorial Office of Gut and Liver 2010 Gut and Liver Vol.4 No.2
Turner`s syndrome is a genetic disorder of the sex chromosomes (e.g., 45,X or 45,X/46,XX) that manifests as various congenital anomalies. Despite its numerous extragonadal manifestations and frequent accompanying abnormalities in liver function tests, liver cirrhosis associated with Turner`s syndrome has not been reported in Korea. Moreover, pulmonary arteriovenous malformations (PAVMs) have rarely been reported in association with liver cirrhosis, but there have been no reports of PAVMs occurring in cryptogenic liver cirrhosis associated with Turner`s syndrome. We report a case of PAVM that occurred in cryptogenic liver cirrhosis associated with Turner`s syndrome. (Gut Liver 2010;4:258-261)
Daclatasvir and Asunaprevir for Chronic Hepatitis C Virus Genotype 1b Infection: Real Life Data
( Ji Hoon Kim ),( Yang Jae Yoo ),( Young-sun Lee ),( Sang Jun Suh ),( Young Kul Jung ),( Yeon Seok Seo ),( Hyung Joon Yim ),( Jong Eun Yeon ),( Kwan Soo Byun ) 대한간학회 2017 춘·추계 학술대회 (KASL) Vol.2017 No.1
Aims: We evaluated the real life efficacy and safety in Korean patients with genotype 1b HCV infection who were treated with daclatasvir and asunaprevir Methods: 410 patients with chronic HCV genotype 1b infection received RAS (resistance associated substitution) examination from July 2015 to September 2016 in three medical centers of Korea university. Among them, 241 patients received daclatasvir and asunaprevir and we analyzed the efficacy and safety in 150 patients who SVR (sustained virologic response) could be attained. HCV RNA at baseline, 4, 12, 24 weeks and SVR (post treatment 12 or 24 weeks) were assayed with laboratory tests. Lower limit of HCV RNA quantification was 20 IU/ml. Significant adverse events were defined as more than grade 3 according to CTCAE v4.0. Results: Among 410 patients, RAS were detected in 20.2% (83/410); L31(2.4%), Y93(16.6%) and both (1.2%). In 150 further analysis patients, mean age was 5.3 years, 107 (71.3%) patients were treatment naïve, and 45(30%) patients had liver cirrhosis (LC). All daclatasvir and asunaprevir treated patients did not have RAS except four (all Y93). Overall SVR rate was 90.7%(136/150). Among 146 patients with no RAS, 133(91.1%) showed SVR. In 4 RAS positive patients, 3 showed SVR. SVR rate according to presence of LC or not were 92.4% and 86.7%. SVR rate according to experience of interferon (IFN) or not were 90.7% in both. SVR rate according to presence of LC-/IFN-, LC-/IFN+, LC+/IFN- and LC+/IFN + were 94.5%, 87.5%, 82.4%, 100%. There was no statistically significant difference but a trend of lower SVR in LC+/IFN- than LC-/IFN- (p=0.07). Any adverse event occurred in 47.3% of patients. One patient showed ALT increase more than 5 upper normal limit and discontinued medication and then ALT increase recovered. Conclusions: In real-life data, daclatasvir and asunaprevir showed good efficacy in consistent with previous clinical studies.
( Ji Hye Je ),( Ji Hoon Kim ),( Yang Jae Yoo ),( Sung Hee Kang ),( Hae Rim Kim ),( Sang Jun Suh ),( Young Kul Jung ),( Yeon Seok Seo ),( Hyung Joon Yim ),( Jong Eun Yeon ),( Kwan Soo Byun ) 대한내과학회 2014 대한내과학회 추계학술발표논문집 Vol.2014 No.1
Background: Several staging systems for hepatocellular carcinoma (HCC) have been purposed but there is no worldwide consensus which staging system is best. We identifi ed the best staging system evaluating the predictive ability for outcome in patients with hepatocellular carcinoma in Korea. Methods: Between January 2004 and December 2009, total of 875 patients with HCC who were diagnosed and treated at the Korea University Guro hospital were enrolled. They were followed up till April 2014. All patients were classifi ed by modifi ed UICC, Barcelona-Clinic Liver Cancer (BCLC), Cancer of the Liver Italian Program (CLIP), Chinese University Prognostic Index (CUPI), Japan Integrated Staging (JIS), Tokyo score. The demographic data, clinical variables, tumor characters, residual liver function and initial treatment modalities were reviewed. The discriminatory ability of staging system was quantifi ed using C-index. And the homogeneity and monotonicity of staging system was assessed using likelihood ratio χ2 test correlated with a Cox`s regression model neutralized by Akaike information criterion (AIC). Results: 654 (74. 7%) patients died and the median survival time was 25 months. The 5-years survival was 28. 1%. There were significant differences between all stage in modifi ed UICC, BCLC, CLIP, CUPI, JIS, Tokyo score. In the overall group of patients, CLIP stage had higher discrimination ability (C-index 0. 76) and the best monotonicity of gradient and homogeneity ability (LR χ2 test : 319. 541, P < 0. 008, AIC : 7789. 566). Also JIS system had higher discrimination ability (C-index 0. 75) and higher monotonicity of gradient and homogeneity ability (LR χ2 test : 320. 356, P<. 0001, AIC : 7792. 751). Conclusions: The CLIP and JIS stage systems showed the best prognostic stratifi cation in HCC patients of Korea.
Change of Mean Platelet Volume Values in Patient with COPD
( Ji Young Park ),( Ja Min Byun ),( Na Eum Jang ),( Ja Won Koo ),( Yee Hyung Kim ),( Cheon Woong Choi ),( Myung Jae Park ),( Jee Hong Yoo ),( Hong Mo Kang ) 대한결핵 및 호흡기학회 2012 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.114 No.-
Background: Mean platelet volume (MPV) is known to be associated with inflammatory or prothrombotic condition as a mark-er of disease activity. The objective of the study is to evaluate MPV values in COPD related to systemic inflammation and to find the differences to disease activity. Method: A retrospective review of medical records was performed on 347 patients who had a complete blood count (CBC) results and who were consistent with diagnosis of COPD in Kyung Hee university hospital from January, 2011 to June, 2012. MPV values were also collected from 323 age-matched healthy subjects of health screening center who had medical examinations. Result: MPV values were 7.9±0.7 fL and 8.3±0.7 fL in patients with COPD and in healthy subjects, respectively. MPV values were significantly lower in patients with COPD than in healthy subjects (p<0.001). According to the severity of COPD, mini-mum values of MPV were significantly lower in patients with severe-very severe COPD than mild-moderate COPD (7.8±0.6 fL vs. 7.6±0.6 fL, p=0.019). Conclusion: The significance of MPV in COPD as a inflammatory marker is not evident, becasue COPD has many confounding factors that can affect MPV. We think further large population-based prospective studies are needed.
( Hyung Tae Kim ),( Sae Young Kim ),( Gyung Jo Byun ),( Byung Chul Shin ),( Jin Young Lee ),( Eun Joo Choi ),( Jong Bum Choi ),( Ji Hee Hong ),( Seung Won Choi ),( Yeon Dong Kim ) 대한통증학회 2017 The Korean Journal of Pain Vol.30 No.4
Background: Recently, the use of ultrasound (US) techniques in regional anesthesia and pain medicine has increased significantly. However, the current extent of training in the use of US-guided pain management procedures in Korea remains unknown. The purpose of the present study was to assess the current state of US training provided during Korean Pain Society (KPS) pain fellowship programs through the comparative analysis between training hospitals. Methods: We conducted an anonymous survey of 51 pain physicians who had completed KPS fellowships in 2017. Items pertained to current US practices and education, as well as the types of techniques and amount of experience with US-guided pain management procedures. Responses were compared based on the tier of the training hospital. Results: Among the 51 respondents, 14 received training at first- and second-tier hospitals (Group A), while 37 received training at third-tier hospitals (Group B). The mean total duration of pain training during the 1-year fellowship was 7.4 months in Group A and 8.4 months in Group B. Our analysis revealed that 36% and 40% of respondents in Groups A and B received dedicated US training, respectively. Most respondents underwent US training in patient-care settings under the supervision of attending physicians. Cervical root, stellate ganglion, piriformis, and lumbar plexus blocks were more commonly performed by Group B than by Group A (P < 0.05). Conclusions: Instruction regarding US-guided pain management interventions varied among fellowship training hospitals, highlighting the need for the development of educational standards that mandate a minimum number of US-guided nerve blocks or injections during fellowships in interventional pain management. (Korean J Pain 2017; 30: 287-95)