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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.
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.
Woo-Jin Lee,Su-Jin Hong,Sang-Hee Kim,Bok-Hee Kim,Akihiro Wakahara,Ji-Won Moon 한양대학교 세라믹연구소 2008 Journal of Ceramic Processing Research Vol.9 No.1
TiOx-₂Nx electrodes were prepared by liquid sprayed mist chemical vapor deposition (LSMCVD) at 1 atmospheric pressure. The liquid source was made by dissolving the starting materials in 2-methoxyethanol. Through controlling the substrate temperature and deposition time, TiO₂-xNx films could successfully be fabricated. The photoelectrochemical response in an electrolyte for nitrogen-doped titanium dioxide, TiOx-₂Nx, was examined. From the optical absorption spectra of TiO₂-xNx and TiO₂ films, the TiO₂-xNx films noticeably absorb the light at less than 550 nm. With light irradiation, the photoelectrochemical response shows significant improvement for the nitrogen-doped film electrode, compared to the situation for undoped TiO₂. TiOx-₂Nx electrodes were prepared by liquid sprayed mist chemical vapor deposition (LSMCVD) at 1 atmospheric pressure. The liquid source was made by dissolving the starting materials in 2-methoxyethanol. Through controlling the substrate temperature and deposition time, TiO₂-xNx films could successfully be fabricated. The photoelectrochemical response in an electrolyte for nitrogen-doped titanium dioxide, TiOx-₂Nx, was examined. From the optical absorption spectra of TiO₂-xNx and TiO₂ films, the TiO₂-xNx films noticeably absorb the light at less than 550 nm. With light irradiation, the photoelectrochemical response shows significant improvement for the nitrogen-doped film electrode, compared to the situation for undoped TiO₂.
Aberrant pyramidal tract in medial lemniscus of brainstem in the human brain
Hong, Ji Heon,Son, Su Min,Byun, Woo Mok,Jang, Han Won,Ahn, Sang Ho,Jang, Sung Ho Lippincott Williams Wilkins, Inc. 2009 NEUROREPORT - Vol.20 No.7
The aberrant pyramidal tract (APT) refers to the collateral pathway of the pyramidal tract through the medial lemniscus in the brainstem. We showed the presence of an APT in the normal human brain using diffusion tensor tractography. Diffusion tensor tractography showed that the motor tracts of the 28 hemispheres in 14 healthy normal individuals originated from the primary sensori-motor cortex and descended through the known pathway of the pyramidal tract. However, in five (17.9%) of the 28 hemispheres, we observed that the APT descended through the medial lemniscus from the midbrain to the pons, and then entered into the pyramidal tract at the upper medulla, after which it descended through the pyramidal tract to the lower medulla.
Woo-Seok Kim,Sung-Hoon Kim,Song-yop Hahn,Kyeong-Dal Choi,Hyeong-Gil Joo,Gye-Won Hong,Jin-Ho Han,Don Kun Lee,Yeon Suk Choi,Ho-Myung Chang 한국초전도저온학회 (구 한국초전도저온공학회) 2003 한국초전도저온공학회논문지 Vol.5 No.3
HTS transformer, pancake winding, sub-cooled liquid nitrogen
Hong, Seok-Woo,Lee, Jinmi,Park, Se Eun,Rhee, Eun-Jung,Park, Cheol-Young,Oh, Ki-Won,Park, Sung-Woo,Lee, Won-Young Korean Endocrine Society 2014 Endocrinology and metabolism Vol.29 No.4
<P><B>Background</B></P><P>Tumor necrosis factor (TNF)-α and AMP-activated protein kinase (AMPK) are known to stimulate and repress lipolysis in adipocytes, respectively; however, the mechanisms regulating these processes have not been completely elucidated.</P><P><B>Methods</B></P><P>The key factors and mechanism of action of TNF-α and AMPK in lipolysis were investigated by evaluating perilipin expression and activity of protein kinase RNA-like endoplasmic reticulum kinase (PERK)/eukaryotic initiation factor 2 α (eIF2α) by Western blot and an immunofluorescence assay in 24-hour TNF-α-treated 3T3-L1 adipocytes with artificial manipulation of AMPK activation.</P><P><B>Results</B></P><P>Enhancement of AMPK activity by the addition of activator minoimidazole carboxamide ribonucleotide (AICAR) suppressed TNF-α-induced lipolysis, whereas the addition of compound C, an inhibitor of AMPK phosphorylation, enhanced lipolysis. Perilipin, a lipid droplet-associated protein, was decreased by TNF-α and recovered following treatment with AICAR, showing a correlation with the antilipolytic effect of AICAR. Significant activation of PERK/eIF2α, a component of the unfolded protein response signaling pathway, was observed in TNF-α or vesicle-treated 3T3-L1 adipocytes. The antilipolytic effect and recovery of perilipin expression by AICAR in TNF-α-treated 3T3-L1 adipocytes were significantly diminished by treatment with 2-aminopurine, a specific inhibitor of eIF2α.</P><P><B>Conclusion</B></P><P>These data indicated that AICAR-induced AMPK activation attenuates TNF-α-induced lipolysis via preservation of perilipin in 3T3-L1 adipocytes. In addition, PERK/eIF2α activity is a novel mechanism of the anti-lipolytic effect of AICAR.</P>