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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.
Woo, Sang Myung,Lee, Woo Jin,Han, Sung-Sik,Park, Sang-Jae,Kim, Tae Hyun,Koh, Young Hwan,Kim, Hyun Bum,Hong, Eun Kyung,Park, Joong-Won,Kim, Chang-Min S. Karger AG 2012 Chemotherapy Vol.58 No.3
<P>Abstract</P><P><B><I>Background:</I></B> Palliative chemotherapy is currently the primary therapeutic approach in the treatment of advanced biliary tract cancer (BTC). Our aim was to assess the efficacy and safety of capecitabine plus cisplatin as first-line chemotherapy for patients with advanced BTC and to analyze the relationship between the level of CA19-9 and clinical outcome. <B><I>Methods:</I></B> We retrospectively reviewed the records of patients who had unresectable, metastatic or recurrent BTC who were treated with capecitabine plus cisplatin. Capecitabine was administered orally at a dose of 1,000 mg/m<SUP>2</SUP> twice a day for 14 days, followed by a 1-week rest period. Cisplatin was administered intravenously on days 1 and 8 at a dose of 30 mg/m<SUP>2</SUP> for 60 min every 3 weeks. <B><I>Results:</I></B> A total of 176 patients were enrolled. Among the 143 assessable patients, 24 (17%) had a partial response. A complete response was radiologically confirmed in 1 patient who had gallbladder cancer. Sixty-two patients (43%) had stable disease and 56 patients (39%) had progressive disease. With a median follow-up of 5.7 months, the median time-to-progression (TTP) was 3.7 months (95% CI 3.1–4.3) and the median overall survival (OS) was 7.4 months (95% CI 6.1–8.7). There was a significant positive correlation between CA19-9 response and TTP (r = 0.66, p = 0.01). CA19-9 response was also significantly correlated with OS (r = 0.57, p < 0.01). The most common grade 3/4 toxicities were nausea/vomiting [12 patients (6.8%)]. <B><I>Conclusions:</I></B> Our results indicate that the capecitabine/cisplatin regimen is well tolerated and has moderate activity against advanced BTC. The CA19-9 response may be a suitable surrogate marker for patients with BTC who are treated with capecitabine/cisplatin.</P><P>Copyright © 2012 S. Karger AG, Basel</P>
Hong Sung Woo,Kim Keon Hyeong,Huh June,Ahn Cheol-Hee,Jo Won Ho The Polymer Society of Korea 2005 Macromolecular Research Vol.13 No.5
To explore the potential of shell crosslinked micelle (SCM) as a drug carrier, the drug release behavior of poly($\varepsilon$-caprolactone)-b-poly(acrylic acid) (PCL-b-PAA) SCMs was investigated. PCL-b-PAA was synthesized by ring opening polymerization of $\varepsilon$-caprolactone and atom transfer radical polymerization of tert-butyl acrylate, followed by selective hydrolysis of tert-butyl ester groups to acrylic acid groups. The resulting amphiphilic polymer was used to prepare SCMs by crosslinking of PAA corona via amidation chemistry. The drug release behavior of the SCMs was studied, using pyrene as a model drug, and was compared with that of non-crosslinked micelles, especially below the critical micelle concentration (CMC). When the shell layers were crosslinked, the drug release behavior of the SCMs was successfully modulated at a controlled rate compared with that of the non-crosslinked micelles, which showed a burst release of drug within a short time.
Hong, Do-Kwan,Joo, Daesuk,Kim, Ji-Won,Woo, Byung-Chul,Koo, Dae-Hyun Korean Society for Precision Engineering 2015 International Journal of Precision Engineering and Vol.16 No.1
This study investigates the experimental validation of transverse flux linear motors (TFLMs) with permanent magnet excitation and the dynamic simulation of the developed TFLM created using the optimal design. Our research challenge is to use the developed direct drive TFLM to substitute the rack and pinion in a rotary motor because the rack and pinion lacks speed and thrust. The electromagnetic field characteristics are calculated using 3D finite element method analyses, and the dynamic characteristics are simulated using mechanical balance equations. After calculating the integral parameters, the dynamic behavior of the machine is simulated. The Matlab/Simulink model for solving motion equations is used. The peak currents obtained from simulations and experiments are very closely matched within 1%, which is the estimation error. The structural stability is evaluated using structural analyses that consider the load and moment of a robot. In order to reduce the structure-borne noise radiated from the main driving frame, damping materials are applied and the sound pressure level decreases by approximately 8.5 dB(A). Finally, the repetitive position accuracy is considered and measured using an API laser tracker T3. The measured repetitive position accuracy is within 0.1 mm at a speed of 3 m/s.
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.