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연산 증폭기 (TL494) 를 이용한 DC/DC 승압 컨버터 제어 시스템 설계
정구종,이혜연,문경주,정유석,이준영,손영익 明知大學校 産業技術硏究所 2009 産業技術硏究所論文集 Vol.28 No.-
A simple control system using an op Amp (TL494) is presented for a DC/DC boost converter. The DC/DC boost converters have many industrial applications including renewable energy sources and hybrid automobiles. The problem of regulating the output voltage in the presence of load variation has been a research subject of interest for many years. After computer simulations with SimPower system of Matlab Simulink, we have developed the converter system in university laboratory according to the design specifications. Since the chip TL494 has both op Amp and PWM comparator even beginners can easily develop the control system. Experimental results show that the proposed system has some robustness with respect to the load variation.
D-Amino Acid Aminotransferase 활성보유 고온성미생물의 탐색 및 분류학적 특성 연구
곽미선,이승구,정상철,서승현,이재흥,전영중,김영호,성문희 충남대학교 약학대학 의약품개발연구소 1999 藥學論文集 Vol.15 No.-
To acquire an industrially useful biocatalyst for the enzymatic synthesis and production of various D-amino acids, 1,300 thermophiles isolated from the soil of Korea were analyzed for D-amino acid aminotransferase (D-AAT) activity. The enzyme activity was found from 110 strains of isolated thermophiles revealing its wide occurrence in thermophiles. Enzyme activity and thermal stability of the D-AAT producers were compared. Finally we have selected four thermophiles as producers of potent biocatalysts for the D-amino acid production; two therrnophiles, Bacillus sp. LK-I and LK-2, having higher specific activity and two thermophiles, B. stearothermophilus KL-01 and Bacillus sp. KLS-0l, having higher thermal stability than the D-AAT producers. Taxonomic and physiological characteristics of the four isolated thermophiles were described herein.
DC/DC 승압 컨버터의 출력 특성 개선을 위한 스너버 회로 설계
김성종,김인혁,정구종,손영익,한병문 明知大學校 産業技術硏究所 2009 産業技術硏究所論文集 Vol.28 No.-
Applications of DC!DC boost converters are increasing recently in many industrial areas including renewable energy sources. High switching frequency of the power semiconductor devices including MOSFET, IGBT causes the EMI noise owing to the large values of dv/dt and di/dt. Since the EMI noises degrade power efficiency and reliability of the system many researches have been made to reduce the noise. This paper presents a passive snubber circuit to improve the tum-on and turn-off transients of the pulsewidth modulated (PWM) DC/DC boost converters. The noises in the output voltage of the DC!DC converter are reduced by adding a resistor and an inductor to the circuit. Experimental results show the effectiveness of the proposed snubber circuit to improve the output characteristics of the boost converter.
반건식-백필터에 의한 소각배가스 중의 HCI, SOx 제거 (Ⅱ)
배병훈,신남철,조정구,문종익,임경택 동아대학교 환경문제연구소 1998 硏究報告 Vol.21 No.2
A combination of process modification and various additives to a lime-based spray-dryer/fabric-filter system was evaluated for its value in promoting sorbent utilization and simultaneous removal of HC1 and SO₂ from waste incineration flue gas. The variety of operating conditions were tested to evaluate important factors such as spray drying reactor(SDR) outlet temperature, retention time, molar equivalence ratio( MER ), fabric filter velocity, etc. For the sorbent activity enhancement, additives such as KmnO₄, NaOH, NaHCO₃, CaCl₂, a mixture of NaOH and CaCl₂ were added to Ca(OH)₂ at optimum operating condition. The mixture of NaOH and CaCl₂ ( 2 : 1 by weight ) was found to be the best economic additive. When that additive, 10% of Ca(OH)₂ by weight, was added, under the condition of Ca(OH)₂ of MER 1.0, HCl/SO₂ removal efficiencies at fabric filter were 98.3% and 97.1%, respectively.
Protective effects of KI against on the acute hepatic Liver injury of SMP30 knock-out mice
( Moon Jung Goo ),( Hye Rim Lee ),( Mi Ran Ki ),( Hae Young Chung ),( Akihito Ishigami ),( Kyu Shik Jeong ),( Jin Kyu Park ),( Da Hee Jeong ),( Ho Yong Park ),( Kwang Hee Son ),( Dong Ha Sin ),( Sun H 한국수의병리학회 2006 학술대회 Vol.10 No.-
Jeong, Da-Hee,Hwang, Meeyul,Park, Jin-Kyu,Goo, Moon-Jung,Hong, Il-Hwa,Ki, Mi-Ran,Ishigami, Akihito,Kim, Ah-Young,Lee, Eun-Mi,Lee, Eun-Joo,Jeong, Kyu-Shik Molecular Diversity Preservation International (MD 2013 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.14 No.12
<P>Smad3 is a key mediator of the transforming growth factor (TGF)-β1 signaling pathway that plays central role in inflammation and fibrosis. In present study, we evaluated the effect of Smad3 deficiency in <I>Smad3</I><SUP>−/−</SUP> mice with carbon tetrachloride (CCl<SUB>4</SUB>)-induced liver fibrosis. The animals were received CCl<SUB>4</SUB> or olive oil three times a week for 4 weeks. Histopathological analyses were performed to evaluate the fibrosis development in the mice. Alteration of protein expression controlled by Smad3 was examined using a proteomic analysis. CCl<SUB>4</SUB>-induced liver fibrosis was rarely detected in <I>Smad3</I><SUP>−/−</SUP> mice compared to <I>Smad3</I><SUP>+/+</SUP>. Proteomic analysis revealed that proteins related to antioxidant activities such as senescence marker protein-30 (<I>SMP30</I>), selenium-binding proteins (SP56) and glutathione <I>S</I>-transferases (GSTs) were up-regulated in <I>Smad3</I><SUP>−/−</SUP> mice. Western blot analysis confirmed that <I>SMP30</I> protein expression was increased in <I>Smad3</I><SUP>−/−</SUP> mice. And <I>SMP30</I> levels were decreased in CCl<SUB>4</SUB>-treated <I>Smad3</I><SUP>+/+</SUP> and <I>Smad3</I><SUP>−/−</SUP> mice. These results indicate that Smad3 deficiency influences the proteins level related to antioxidant activities during early liver fibrosis. Thus, we suggest that Smad3 deteriorate hepatic injury by inhibitor of antioxidant proteins as well as mediator of TGF-β1 signaling.</P>
Jeong Shin An,Hyun Goo Kim,Se Hyun Paek,Jun Woo Lee,Juhyun Woo,Hyungju Kwon,Woosung Lim,Byung-In Moon,Nam Sun Paik 대한갑상선-내분비외과학회 2017 The Koreran journal of Endocrine Surgery Vol.17 No.1
Purpose: Endoscopic thyroidectomy using a cervico-axillary approach (CAA) provides optimal visualization with a smaller dissection plane. Despite the excellent cosmetic results and high patient satisfaction, the surgical and oncologic safety of CAA endoscopic surgery has not been fully established. The present study evaluated the feasibility, safety, and surgical outcomes of CAA endoscopic thyroidectomy. Methods: From October 2009 to April 2012, 100 patients with papillary thyroid cancer underwent CAA endoscopic thyroidectomy. Patient demographics, pathologic features, and surgical outcomes including complications and recurrence were collected. Results: CAA endoscopic thyroidectomy was successful in all patients, and none required conversion to open thyroidectomy. All patients underwent ipsilateral thyroid lobectomy with or without central compartment neck dissection. The mean tumor size was 1.0±0.6 cm (range, 0.5∼1.6), and 35.0% of tumors showed extrathyroidal extension. The mean number of harvested lymph nodes was 4.1±4.4, and metastasis was found in 12.0% of patients. The mean surgical time was 175.2±50.4 min, mean intraoperative blood loss was 42.5±69.2 ml, and the mean hospital stay was 3.3±0.6 days. There were five cases of postoperative transient hypocalcemia and eight cases of vocal cord palsy. No permanent complication or postoperative bleeding was observed. Patients continued to be seen for a median period of 63.7 months, and no recurrence of thyroid cancer was seen. Conclusion: CAA endoscopic thyroidectomy is a feasible and safe procedure for low-risk thyroid cancer, with excellent cosmesis. It can be recommended as an alternative option for selected patients with low-risk thyroid cancer.