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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.
Won, Jumin,Hong, Young Joon,Jeong, Myung Ho,Park, Hyuk Jin,Kim, Min Chul,Kim, Woo Jin,Kim, Hyun Kuk,Sim, Doo Sun,Kim, Ju Han,Ahn, Youngkeun,Cho, Jeong Gwan,Park, Jong Chun Chonnam National University Medical School 2016 CMJ Vol.52 No.2
<P>Statins and renin-angiotensin system (RAS) blockers are key drugs for treating patients with an acute myocardial infarction (AMI). This study was designed to show the association between treatment with statins or RAS blockers and clinical outcomes and the efficacy of two drug combination therapies in patients with ischemic heart failure (IHF) who underwent revascularization for an AMI. A total of 804 AMI patients with a left ventricular ejection fraction <40% who undertook percutaneous coronary interventions (PCI) were analyzed using the Korea Acute Myocardial Infarction Registry (KAMIR). They were divided into four groups according to the use of medications [Group I: combination of statin and RAS blocker (n=611), Group II: statin alone (n=112), Group III: RAS blocker alone (n=53), Group IV: neither treatment (n=28)]. The cumulative incidence of major adverse cardiac and cerebrovascular events (MACCEs) and independent predictors of MACCEs were investigated. Over a median follow-up study of nearly 1 year, MACCEs had occurred in 48 patients (7.9%) in Group I, 16 patients (14.3%) in Group II, 3 patients (5.7%) in Group III, 7 patients (21.4%) in Group IV (p=0.013). Groups using RAS blocker (Group I and III) showed better clinical outcomes compared with the other groups. By multivariate analysis, use of RAS blockers was the most powerful independent predictor of MACCEs in patients with IHF who underwent PCI (odds ratio 0.469, 95% confidence interval 0.285-0.772; p=0.003), but statin therapy was not found to be an independent predictor. The use of RAS blockers, but not statins, was associated with better clinical outcomes in patients with IHF who underwent PCI.</P>
Hong, Min-Eui,Hwang, Sung Kwan,Chang, Won Seok,Kim, Byung Woo,Lee, Jeewon,Sim, Sang Jun Springer-Verlag 2015 Applied microbiology and biotechnology Vol.99 No.12
<P>High temperatures (30-36 C) inhibited astaxanthin accumulation in Haematococcus pluvialis under photoautotrophic conditions. The depression of carotenogenesis was primarily attributed to excess intracellular less reactive oxygen species (LROS; O2 (-) and H2O2) levels generated under high temperature conditions. Here, we show that the heat stress-driven inefficient astaxanthin production was improved by accelerating the iron-catalyzed Haber-Weiss reaction to convert LROS into more reactive oxygen species (MROS; O2 and OH), thereby facilitating lipid peroxidation. As a result, during 18 days of photoautotrophic induction, the astaxanthin concentration of cells cultured in high temperatures in the presence of iron (450 μM) was dramatically increased by 75 % (30 C) and 133 % (36 C) compared to that of cells exposed to heat stress alone. The heat stress-driven Haber-Weiss reaction will be useful for economically producing astaxanthin by reducing energy cost and enhancing photoautotrophic astaxanthin production, particularly outdoors utilizing natural solar radiation including heat and light for photo-induction of H. pluvialis.</P>
Hong, Chae Hwan,Lee, Young Bum,Bae, Jin Woo,Jho, Jae Young,Nam, Byeong Uk,Hwang, Tae Won 한국공업화학회 2005 Journal of Industrial and Engineering Chemistry Vol.11 No.2
The effect of molecular weight of a compatibilizer on the mechanical properties of polypropylene/ clay nanocomposites was investigated. Nanocomposites of polypropylene with organically modified clays were prepared by melt compounding of the three components, i.e., polypropylene, maleic anhydride-grafted polypropylene (PP-g-MA) as a compatibilizer, and organically modified clay. Three kinds of PP-g-MA with different molecular weight were used. The nanocomposites' clay dispersion and mechanical properties, such as flexural modulus and impact resistance, were investigated. X-Ray diffraction patterns showed that the maleic anhydride content of PP-g-MA affected the dispersion of clay particles. The mechanical testing results showed that the molecular weight of PP-g-MA profoundly affected the impact strength of the polypropylene/ clay nanocomposites.
Performance of Polypropylene/Clay Nanocomposites for Automotive Parts Applications
Hong, Chae Hwan,Lee, Young Bum,Bae, Jin Woo,Jho, Jae Young,Nam, Byeong Uk,Hwang, Tae Won 한국공업화학회 2005 Journal of Industrial and Engineering Chemistry Vol.11 No.1
Nanocomposites of polypropylene and organically modified clays were compounded in a twin-screw extruder through two-step melt compounding of three components, i.e., polypropylene, maleic anhydride-grafted polypropylene (PP-g-MA), and organically modified clay. We examined the effects of PP-g-MA compatibilizers, including PH-200, Epolene-43, Polybond-3002, and Polybond-3200, with a wide range of maleic anhydride (MA) contents and molecular weights. The nanocomposites' morphologies and mechanical properties, such as stiffness, strength, and impact resistance, were investigated. X-Ray diffraction patterns showed that the dispersion morphology of the clay particles seemed to be determined in the first compounding step and further dispersion of the clays did not occur during the second compounding step. As the ratio of PP-g-MA to clay the increased, the clay particles became dispersed more uniformly in the matrix resin. As the dispersibility of the clays was enhanced, the reinforcement effect of the clays increased, but their impact resistance decreased.
Persistent Current Mode of a 1-T-Class HTS Pancake Coil for NMR/MRI Applications
Woo-Seok Kim,Seyeon Lee,Yungil Kim,Ji Young Lee,Sang-Ho Park,Ji-Kwang Lee,Gye-Won Hong,Jinho Han,Kyeongdal Choi Institute of Electrical and Electronics Engineers 2015 IEEE transactions on applied superconductivity Vol.25 No.3
<P>We had proposed a winding method, the so-called “wind-and-flip,” which enables a persistent current-mode operation of a high-temperature superconducting (HTS) pancake coil. Two pancake coils had been fabricated using this method and tested in a liquid nitrogen bath with an external magnetic field. The result showed that the time stability was not good enough to use for magnetic resonance imaging or nuclear magnetic resonance when they were magnetized by field cooling at 77 K. In this paper, the test results of a stacked HTS pancake coil for a center magnetic field of 1 T are presented. The coils were cooled to 20 K by conduction cooling using a Gifford-McMahon cryocooler. We measured the time stability of the persistent current-mode operation at 20 K, which shows a strong possibility of a high-field HTS magnet using this method.</P>