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이상현(Sang-Hyun Lee),박진민(Jin-Min Park),문상필(Sang-Pil Mun),서기영(Ki-Young Suh) 한국조명·전기설비학회 2003 한국조명·전기설비학회 학술대회논문집 Vol.2003 No.-
For small capacity rectifier circuits such as these for consumer electronics and appliances, capacitor input type rectifier circuits are generally used. Consequently, various harmonics generated within the power system become a serious problem. Various studies of this effect have been presented previously. However, most of these employ switching devices, such as FETs and the like. The absence of switching devices makes systems more tolerant to over-load, and brings low radio noise benefits. We propose a power factor correction scheme using a LC resonant in commercial frequency without switching devices. In this method, it makes a sinusoidal wave by widening conduction period using the current resonance in commercial frequency, Hence the harmonic characteristics can be significantly improved, where the lower order harmonics, such as the fifth and seventh order are much reduced. The result are confirmed by the theoretical and experiment implementations.
Surface Modification of Block Copolymer Through Sulfur Containing Plasma Treatment
Choi, Sang Wook,Shin, Jae Hee,Jeon, Min Hwan,Mun, Jeong Ho,Kim, Sang Ouk,Yeom, Geun Young,Kim, Kyong Nam American Scientific Publishers 2015 Journal of Nanoscience and Nanotechnology Vol.15 No.10
<P>Some of the important issues of block copolymer (BCP) as an application to the potential low cost next generation lithography are thermal stability and deformation during pattern transfer process in addition to defect density, line edge/width roughness, etc. In this study, sulfur containing plasma treatment was used to modify the BCP and the effects of the plasma on the properties of plasma treated BCP were investigated. The polystyrene hole pattern obtained from polystyrene polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) was initially degraded when the polystyrene hole was annealed at 190 degrees C for 15 min. However, when the hole pattern was treated using sulfur containing plasmas using H2S or SF6 up to 2 min, possibly due to the sulfurization of the polystyrene hole surface, no change in the hole pattern was observed after the annealing even though there is a slight change in hole shapes during the plasma treatment. The optimized plasma treated polystyrene pattern showed the superior characteristics as the mask layer by showing better thermal stability, higher chemical inertness, and higher etch selectivity during plasma etching.</P>
P412 : Giant chondroid syringoma appearing as Large protruding telangiectatic tumor on nose
( Sung Min Park ),( Gun Wook Kim ),( Hyun Ho Cho ),( Won Jeong Kim ),( Margaret Song ),( Hoon Soo Kim ),( Hyun Chang Ko ),( Byung Soo Kim ),( Moon Bum Kim ),( Je Ho Mun ) 대한피부과학회 2014 대한피부과학회 학술발표대회집 Vol.66 No.1
( Sang Soo Lee ),( Young Sang Byoun ),( Mun Hyuk Seong ),( Hyung Rae Sohn ),( Bo Young Min ),( Eun Sun Jang ),( Jin Wook Kim ),( Sook Hyang Jeong ) 대한간학회 2012 춘·추계 학술대회 (KASL) Vol.2012 No.-
Background: The objective of this study was to investigate the characteristics and outcomes of hepatocellular carcinoma (HCC) in patient with nonalcoholic fatty liver disease (NAFLD) in Korea, which were compared to HCC related to hepatitis C virus (HCV) or to alcohol drinking. Methods: A total 424 HCC patients were consecutively enrolled in the hospital from January 2003 to December 2011. NAFLD was attributable to 4.7% of HCC (20 patients), while HBV to 68.2% (n=289)), HCV to 11.6% (n=49), and alcohol to 15.6% (n=66). Retrospective analysis of dermographics, liver function, tumor characteristics, treatment of initial choice and survival rate in NAFLD-HCC group was performed in comparison with HCV-HCC or Alcohol-HCC group. Results: NAFLD-HCC patients showed mean age of 69.9 year, proportion of male (55.0%), obesity (25.0%), diabetes (40. 0%), hypertension (55.0%), and hypercholesterolemia (10.0%) at diagnosis. Moreover, NAFLD-HCC group presented significantly higher rate of single nodular tumor (75.0% vs. 47.0%, p=0.032) and lower rate of portal vein thrombosis (5.0% vs. 28.8%, p=0.027) than HCV-HCC group, respectively. The single nodular presentation was significantly higher in NAFLD-HCC than alcohol-HCC group (75.0% vs. 38.8%, p=0.028, respectively), too. However, there were no significant differences in Child Pugh class, tumor stages (TNM, JIS, CLIP, and BCLC) and overall cumulative survival rate either between NAFLD-HCC and HCV-HCC, or NAFLD-HCC and alcohol-HCC group. Conclusions: NAFLD may take about 5% of current HCC etiology in Korea. The clinical characteristics of NAFLD-HCC were frequent company by metabolic features, single nodular tumor presentation with less frequent portal vein invasion. Further study is warranted to elucidate the biological characteristics of NAFLD-HCC.
( Sang Soo Lee ),( Young Sang Byoun ),( Mun Hyuk Seong ),( Hyung Rae Sohn ),( Bo Young Min ),( Eun Sun Jang ),( Jin Wook Kim ),( Sook Hyang Jeong ) 대한간학회 2012 춘·추계 학술대회 (KASL) Vol.2012 No.1
Background: The objective of this study was to investigate the characteristics and outcomes of hepatocellular carcinoma (HCC) in patient with nonalcoholic fatty liver disease (NAFLD) in Korea, which were compared to HCC related to hepatitis C virus (HCV) or to alcohol drinking. Methods: A total 424 HCC patients were consecutively enrolled in the hospital from January 2003 to December 2011. NAFLD was attributable to 4.7% of HCC (20 patients), while HBV to 68.2% (n=289)), HCV to 11.6% (n=49), and alcohol to 15.6% (n=66). Retrospective analysis of dermographics, liver function, tumor characteristics, treatment of initial choice and survival rate in NAFLD-HCC group was performed in comparison with HCV-HCC or Alcohol-HCC group. Results: NAFLD-HCC patients showed mean age of 69.9 year, proportion of male (55.0%), obesity (25.0%), diabetes (40.0%), hypertension (55.0%), and hypercholesterolemia (10.0%) at diagnosis. Moreover, NAFLD-HCC group presented significantly higher rate of single nodular tumor (75.0% vs. 47.0%, p=0.032) and lower rate of portal vein thrombosis (5.0% vs. 28.8%, p=0.027) than HCV-HCC group, respectively. The single nodular presentation was significantly higher in NAFLD-HCC than alcohol-HCC group (75.0% vs. 38.8%, p=0.028, respectively), too. However, there were no significant differences in Child Pugh class, tumor stages (TNM, JIS, CLIP, and BCLC) and overall cumulative survival rate either between NAFLD-HCC and HCV-HCC, or NAFLD-HCC and alcohol-HCC group. Conclusions: NAFLD may take about 5% of current HCC etiology in Korea. The clinical characteristics of NAFLD-HCC were frequent company by metabolic features, single nodular tumor presentation with less frequent portal vein invasion. Further study is warranted to elucidate the biological characteristics of NAFLD-HCC.
P249 : Acupuncture-related dermatosis
( Sung Min Park ),( Hyun Ho Cho ),( Won Jeong Kim ),( Je Ho Mun ),( Margaret Song ),( Hoon Soo Kim ),( Hyun Chang Ko ),( Byung Soo Kim ),( Moon Bum Kim ) 대한피부과학회 2013 대한피부과학회 학술발표대회집 Vol.65 No.2
Background: Acupuncture is one of the most popular treatment modality in Oriental medicine to treat various diseases and to control pain, but its adverse effect can be overlooked easily. Objectives: This study was conducted to investigate kinds of dermatologic adverse effect of acupuncture and to arouse people`s attention to indiscriminate procedure. Methods: We evaluated clinicopathologic diagnosis, treatment and prognosis in patients who have causal relationship between acupuncture and dermatosis. Results: There were 23 patients with history of acupuncture. Among them, 13 patients got bee venom acupuncture. Most patients got acupuncture for pain control. The median age was 52 years and the male to female ratio was 5: 18. They were finally diagnosed with atypical mycobacterial infection, pyoderma, abscess, foreign body granuloma, bee sting reaction and others (lipoatrophy, contact dermatitis, scar). They were treated with antibiotics only, topical or intralesional or systemic steroid only, antibiotics with systemic steroid. It takes longer time to treat in cases perfomed by unlisenced personnel. Conclusion: In this study, we were able to recongnize various dermatologic adverse effects of acupuncture and danger of acupuncture perfomed by unlisenced personnel. We wish that this report could raise people and oriental doctor`s attention to adverse effects of acupuncture.
Original Articles : Type and cause of Liver disease in Korea: single-center experience, 2005-2010
( Sang Soo Lee ),( Young Sang Byoun ),( Sook Hyang Jeong ),( Yeo Myung Kim ),( Ho Gil ),( Bo Young Min ),( Mun Hyuk Seong ),( Eun Sun Jang ),( Jin Wook Kim ) 대한간학회 2012 Clinical and Molecular Hepatology(대한간학회지) Vol.18 No.3
Background/Aims: The aim of this study was to describe the types and causes of liver disease in patients from a single community hospital in Korea between April 2005 and May 2010. Methods: A cohort of patients who visited the liver clinic of the hospital during the aforementioned time period were consecutively enrolled ( n=6,307). Consistent diagnostic criteria for each liver disease were set by a single, experienced hepatologist, and the diagnosis of all of the enrolled patients was confirmed by retrospective review of their medical records. Results: Among the 6,307 patients, 528 (8.4%) were classified as acute hepatitis, 3,957 (62.7%) as chronic hepatitis, 767 (12.2%) as liver cirrhosis, 509 (8.1%) as primary liver cancer, and 546 (8.7%) as a benign liver mass or other diseases. The etiologies in the acute hepatitis group in decreasing order of prevalence were hepatitis A (44.3%), toxic hepatitis (32.4%), other hepatitis viruses (13.8%), and cryptogenic hepatitis (9.1%). In the chronic hepatitis group, 51.2% of cases were attributed to viral hepatitis, 33.3% to nonalcoholic fatty liver disease, and 13.0% to alcoholic liver disease (ALD). Of the cirrhoses, 73.4% were attributable to viral causes and 18.1% to alcohol. Of the hepatocellular carcinoma cases, 86.6% were attributed to viral hepatitis and 11.6% to ALD. Among the benign tumors, hemangioma comprised 52.2% and cystic liver disease comprised 33.7%. Conclusions: Knowledge of the current status of the type and cause of liver disease in Korea may be valuable as a basis for evaluating changing trends in liver disease in that country. (Clin Mol Hepatol 2012;18:309-315)