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바이오매스 합성가스를 이용한 엔진 발전 시스템의 경제성 평가
문지홍(Ji Hong Moon),이정우(Jeung Woo Lee),방병열(Byung Ryeul Bang),김세원(Se Won Kim),이은도(Uen Do Lee) 한국열환경공학회 2010 한국열환경공학회 학술대회지 Vol.2010 No.추계
Biomass, a carbon neutral fuel, is one of the fastest growing renewable energy sources. In this study, economic feasibility of small scale power generation system using syngas from biomass has been investigated. Effects of important variables such as capital investment, cost of waste wood, renewable energy certificate(REC), system marginal price(SMP) on the benefit of business have been analyzed. Internal rate of return(IRR) was predicted as 16.90%, which implicates the business is promising based on the assumptions such as SMP of 137 Won/kWh, capital cost of 4.7 billion won, and waste wood price of 30 thousand won. Major factors affecting the benefit of business are as follows; system marginal price, operational rate, capital investment, expenditure of waste wood, certified emission reduction.
Se-Jong Bae,Hwui-Dong Cho,Ki-Hun Kim,Shin Hwang,Chul-Soo Ahn,Deok-Bog Moon,Tae-Yong Ha,Gi-Won Song,Dong-Hwan Jung,Gil-Chun Park,Young-In Yoon,Sung-Gyu Lee 한국간담췌외과학회 2022 Annals of hepato-biliary-pancreatic surgery Vol.26 No.2
Backgrounds/Aims: Anatomical resection has superior oncologic outcomes over non-anatomical resection in hepatocellular carcinoma, and left lateral sectionectomy is the simplest and easiest perform anatomical resection procedure among liver resections. The purpose of this study was to find out the safety and feasibility of pure laparoscopic left lateral sectionectomy (PLLLS) for hepatocellular carcinoma. Methods: Patients who underwent left lateral sectionectomy at a tertiary referral hospital, from August 2007 to April 2019 were enrolled in this retrospective study. After matching the 1 : 3 propensity score, 17 open and 51 pure laparoscopic cases were selected out of 102 cases of total left lateral resection for hepatocellular carcinoma. The group was analyzed in terms of patient demographics, preoperative data, and postoperative outcomes. Results: During the study period, there was no open conversion case. The mean operative time and complication were not statistically significant different between the two groups. There was no statistically significant difference in disease-free survival and overall survival had no statistical between the two groups. There were no mortality cases, and postoperative hospital stay was significantly shorter in the PLLLS group than in the open left lateral sectionectomy (OLLS) group. Conclusions: The oncologic outcomes and complication rate were the same in the PLLLS and OLLS groups. However, the hospital stay was shorter in the PLLLS group than in the OLLS group. The present study findings demonstrate that the PLLLS is a safe and feasible procedure for hepatocellular carcinoma.
( Se Ri Ryu ),( Seong Hee Kang ),( Jeong-ju Yoo ),( Soung Won Jeong ),( Moon Young Kim ),( Sang Gyune Kim ),( Jae Young Jang ),( Young Seok Kim ),( Soon Koo Baik ),( Yong Jae Kim ),( Su Yeon Park ) 대한간학회 2018 춘·추계 학술대회 (KASL) Vol.2018 No.1
Aims: To investigate correlation between hepatic venous pressure gradient (HVPG) and transient elastography (TE) in patients with cirrhosis and to identify a cut-off value of TE to HVPG in clinically significant portal hypertension (CSPH, HVPG ≥10mmHg) and severe portal hypertension (SPH, HVPG >12mmHg) according to the cause of cirrhosis. Methods: Between January 2008 and March 2017, 553 patients who underwent HVPG and TE were consecutively enrolled at the three Korean tertiary medical centers. HVPG and TE were performed within 1 month interval. Patients were classified with the cause of liver cirrhosis, and the cut-off value of TE was analyzed for patients with alcoholic and viral origin of cirrhosis. Results: The mean age was 53.3±9.8 years, and the majority (81.6%) were male. A significant positive correlation was noted between liver stiffness and HVPG levels (r=0.544, P<0.001). The area under receiver operating characteristic curves for TE to diagnose CSPH and SPH were 0.829 (95%CI: 0.790-0.868) and 0.80.2 (95%CI: 0.765-0.840). Among all cause of liver cirrhosis, the most common etiology was 1)alcohol 335(60.6%) followed by 2)chronic hepatitis B(CHB) 128(23.1%), 3)CHB with alcohol 45(8.1%), 4)cryptogenic 22(4%), 5)chronic hepa-titis C(CHC) 18(3.3%), and 6)CHC with alcohol 5(0.9%). HVPG and TE values were evaluated for total patients, patients with alcoholic(1), and viral [(2)+(5)] cirrhosis. In total patients, a cut-off values of TE of 27.6 and 32.5kPa were obtained by using Youden index to best predict CSPH and SPH, respectively. In alcoholic cirrhosis, a cut-off values of TE were 32.2 kPa and 36.6 kPa, for CSPH and SPH, respectively. In viral cirrhosis, a cut-off values of TE was 18.0 kPa for both CSPH and SPH(Table 1). Conclusions: In the alcoholic cirrhosis, cut off value of TE was higher than that of viral cirrhosis. Therefore, it is necessary to interpret the TE value depending on the cause of liver cirrhosis.
Se-Young Chun,Sang-Ki Moon,Won-PiI Baek,Moon-Ki Chung,Masanori Aritomi 대한기계학회 2003 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.17 No.8
An experimental study on critical heat flux (CHF) has been performed in an internally heated vertical annulus with non-uniform heating. The CHF data for the chopped cosine heat flux have been compared with those for uniform heat flux obtained from the previous study of the authors, in order to investigate the effect of axial heat flux distribution on CHF. The local CHF with the parameters such as mass flux and critical quality shows an irregular behavior. However, the total critical power with mass flux and the average CHF with critical quality are represented by a unique curve without the irregularity. The effect of the heat flux distribution on CHF is large at low pressure conditions but becomes rapidly smaller as the pressure increases. The relationship between the critical quality and the boiling length is represented by a single curve, independent of the axial heat flux distribution. For non-uniform axial heat flux distribution, the prediction results from Doerffer et al.'s and Bowring's CHF correlations have considerably large errors, compared to the prediction for uniform heat flux distribution.
Moon, Youngkwang,Jafry, Ali Turab,Bang Kang, Soon,Young Seo, Jin,Baek, Kyung-Youl,Kim, Eui-Joong,Pan, Jae-Gu,Choi, Jae-Youl,Kim, Hyun-Ji,Han Lee, Kang,Jeong, Keunhong,Bae, Se Won,Shin, Seunghan,Lee, J Elsevier 2019 Journal of hazardous materials Vol.365 No.-
<P><B>Abstract</B></P> <P>A region suffering from an attack of a nerve agent requires not only a highly sorptive material but also a fast-acting catalyst to decontaminate the lethal chemical present. The product should be capable of high sorptive capacity, selectivity and quick response time to neutralize the long lasting harmful effects of nerve agents. Herein, we have utilized organophosphorus hydrolase (OPH) as a non-toxic bio-catalytic material held in with the supporting matrix of poly-β-cyclodextrin (PCD) as a novel sorptive reinforced self-decontaminating material against organophosphate intoxication. OPH coated PCD (OPH-PCD) will not only be providing support for holding enzyme but also would be adsorbing methyl paraoxon (MPO) used as a simulant, in a host-guest inclusion complex formation. Sorption trend for PCD revealed preference towards the more hydrophobic MPO against <I>para</I>-nitrophenol (pNP). The results show sorption capacity of 1.26 mg/g of 100 μM MPO with PCD which was 1.7 times higher compared to pNP. The reaction rate with immobilized OPH-PCD was found to be 23% less compared to free enzyme. With the help of OPH-PCD, continuous hydrolysis (100%) of MPO into pNP was observed for a period of 24 h through packed bed reactor with good reproducibility and stability of enzyme. The long-term stability also confirmed its stable nature for the investigation period of 4 days where it maintained activity. Combined with its fast and reactive nature, the resulting self-decontaminating regenerating material provides a promising strategy for the neutralization of nerve agents and preserving the environment.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Synthesis of non-toxic, sorptive reinforced self-decontaminating material is reported. </LI> <LI> Organophosphorus hydrolase (OPH) enzyme is immobilized onto poly-β-cyclodextrin (PCD) by physical entrapment. </LI> <LI> PCD provides a unique and robust support for OPH enzyme and acts as a regenerative sorption material. </LI> <LI> OPH-PCD system shows high sorption and remarkably fast degradation of MPO. </LI> <LI> OPH-PCD is extremely stable for long term usage. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Colloidal lithography with crosslinkable particles: fabrication of hierarchical nanopore arrays
Moon, Jun Hyuk,Kim, Won Sun,Ha, Jong-Wook,Jang, Se Gyu,Yang, Seung-Man,Park, Jung-Ki Royal Society of Chemistry 2005 Chemical communications Vol.2005 No.32
<P>We demonstrate that colloidal lithography with self-assembled monolayers of crosslinkable polymeric particles can be used to create hierarchical arrays of nanopores on substrates.</P> <P>Graphic Abstract</P><P>Colloidal lithography with self-assembled monolayers of crosslinkable polymeric particles has been developed to create hierarchical arrays of nanopores on substrates. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b507542d'> </P>