• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2010.11a
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• pp.784-785
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• 2010

The high enthalpy plasma research center in Chonbuk national university is under construction for MW class plasma wind tunnel. Four types of plasma equipment will be installed in the research center. The equipments are 1set of 0.4 MW class enhanced Huels type plasma equipment, 1 set of 2.4 MW class enhanced Huels type plasma quipment, 1 set of 60 kW RF plasma equipment and 1 set of 200 kW RF plasma equipment. And electrical, water and gas utilities to assistant plasma equipments are under construction.

• Journal of the Korean Society of Propulsion Engineers
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• v.22 no.5
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• pp.115-124
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• 2018

Thermal protection materials (TPMs) are very crucial for the survival of any re-entry space vehicles. One of the systems used for rigorous validation of TPMs is an enhanced Huel type segmented arc-heated plasma wind tunnel. A 0.4 MW class arc-heated plasma wind tunnel has been constructed at Chonbuk National University which is capable of producing high enthalpy supersonic flow. In this paper we have studied the characteristics of plasma flow according to power and mass flow parameters.

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.32 no.3
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• pp.107-114
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• 2022

Carboxymethyl cellulose/poly(ethylene glycol) (CMC/PEG) hydrogels crosslinked with citric acid (CA) are synthesized to evaluate the effect of CMC molecular weight (Mw), PEG and CA concentration on the optical property, swelling rate (SR), degradation rate (DR), and cytotoxicity and cell proliferation of hydrogels. For crosslinked CMC/PEG hydrogels, the FT-IR peak intensity associated with hydroxyl groups decreases due to PEG intercalation (esterification crosslinking) between CMC chains in a similar manner as the concentration of CA crosslinker increases. Crosslinked CMC (Mw = 90,000)/PEG hydrogels with 10 % CA dissolve regardless of PEG content. However, the SR of the CMC (Mw = 250,000)/PEG hydrogels decrease from 4923 % to 168 % with increasing PEG and CA concentrations from 0 to 20 % and from 0 to 25 %, respectively. As the Mw of CMC increases, the DR of the hydrogel is greatly improved. CMC (Mw = 250,000)/PEG10 hydrogels with 10 % CA exhibit the optimum properties of high absorbing capacity (3,200 %) with moderate DR (54 %), stiffness (1.39 ± 0.19 GPa), and cell viability (94.8 ± 1.3 %). CA-crosslinked CMC/PEG hydrogels are highly suitable for wound dressing or personal care applications due to their non-toxicity, good cell proliferation, SR, and mechanical properties.

• Progress in Superconductivity and Cryogenics
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• v.10 no.3
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• pp.36-42
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• 2008

The superconducting motor shows several advantages such as smaller size and higher efficiency against conventional motor especially utilized in ship propulsion application. However, this size reduction merit appears in large capacity more than several MW. We are going to develop a 5MW class synchronous motor with rotating High-Temperature Superconducting (HTS) coil. that is aimed to be utilized for ship propulsion so it has very low-speed, The ship propulsion motor must generate very high electromagnetic torque instead of low-speed. Therefore. the rotor (field) coils need very large magnetic flux that results in large amount of expensive HTS conductor for the field coil. In this paper a 5MW HTS motor for ship propulsion is considered to be designed with construction cost reduced via HTS field coil cost reduction because HTS conductor cost is critical factor in the construction cost of HTS motor. In order to reduce the HTS conductor amount. iron-cored rotor types are considered. so several cases with iron-core are compared one another and with an air-core case.

• Molecular Medicine Reports
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• v.19 no.3
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• pp.1809-1816
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• 2019

The extract of Sappan Lignum, the heartwood of Caesalpinia sappan L., has been used in medicine to improve blood circulation. Recently, the application of microwave extraction methods has been a major focus of research into the extraction of components from natural sources. In this experiment, we compared the anti-inflammatory effects of Sappan Lignum prepared by heat-70% EtOH extraction (CSE-H-70E) and microwave-70% EtOH extraction (CSE-MW-70E). High-performance liquid chromatography analysis was used to identify the compounds in these extracts. The heat-70% EtOH and microwave-70% EtOH extracts of Sappan Lignum had different chromatograms. CSE-MW-70E significantly inhibited the protein expression of iNOS and COX-2, PGE2, TNF-α, and reduced NO and IL-1β production in macrophages exposed to LPS, whereas, only high concentrations of CSE-H-70E (20 ㎍/ml) resulted in any effects. Furthermore, CSE-MW-70E upregulated heme oxygenase-1 (HO-1) expression. In addition, the use of tin protoporphyrin, an inhibitor of HO-1, confirmed the inhibitory effects of CSE-MW-70E on pro-inflammatory mediators. These results suggested that the CSE-MW-70E-mediated upregulation of HO-1 played an important role in the anti-inflammatory effects of macrophages. Therefore, these findings showed that microwave extraction can be utilized to improve the extraction efficiency and biological activity of Sappan Lignum.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2001.05a
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• pp.1056-1061
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• 2001

This paper describes the evaluation of noise influence of residental and boundary areas from power plant noise sources of 1200MW combined cycle power plant. Noise assessments are carried out by based on the ISO 3744, ISO 9613-1 and ISO 9613-2 to predict the noise distribution to satisfy the recommended noise level at specific locations and to calculate properly the octave noise power of main noise sources such as power transformers. air-intakes, stacks.

• 전기의세계
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• v.32 no.11
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• pp.677-683
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• 1983

O&R사(Orange and Rockland Utilities, Inc.)는 뉴욕주의 Pearl River에 위치한 발전설비용량 1010MW의 전력회사로서 뉴욕주동남부와 뉴저지주북부 그리고 펜실바니아주 동북부의 약1,350평방마일의 지역에 전기와 천연가스(Natural Gas)를 공급하는 회사이다. 1980년 최대전력수요는 여름철이 736MW, 겨울철이 570MW이었고, 연간판매전력량은 3655백만kwh였다. 에너지관리시스템(EMS)으로는 SEL 32/75 컴퓨터를 사용한 웨스팅하우스사의 Dual Image 32 System이 설치되어 있는데 이 시스템의 특징과 설비구성에 관해 소개하고자 한다.

• The Safety technology
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• no.201
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• pp.24-25
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• 2014

한국남동발전(주) 여수화력발전처는 중화학업체들이 대거 입주한 여수국가산업단지에 전력을 공급하고 있다. 지난 1975년 중유발전으로 가동을 시작한 이후 80년대에는 오일쇼크를 겪으면서 가동을 중단하기도 했고, 이 때문에 외국계기업으로의 매각설까지 나돌았었다. 크고 작은 부침이 있었지만 90년대 재가동 이후 석탄발전으로 전환도 꾀하면서 발전용량도 200MW, 300MW에서 각각 350MW로 증설하고 있다. 여수화력발전처가 약 40여 년의 역사동안 변화와 성장을 거듭할 수 있었던 것은 황상연 처장의 노력이 크다. 1979년 한국전력에 입사해 상당기간을 여수에서 근무했던 그에게 36년 동안 쌓아온 발전경영에 대한 노하우를 들어봤다.

• Electric Engineers Magazine
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• s.338
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• pp.16-18
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• 2010

두산중공업은 지난 2007년 5월 16일 세계 최대 규모의 인도 구자라트 지역에 있는 문드라(Mundra) 석탄화력발전 프로젝트를 수주했다. 문드라 석탄화력발전소는 인도정부가 전력난 해소와 전력요금 인하를 위해 2016년까지 9개의 초대형 화력발전소를 건설하는 프로젝트의 일환으로, 800MW급 초임계압 보일러 5기, 총 발전용량 4,000MW에 이르는 사상 최대 규모의 발전소다. 두산중공두산중공업은 인도 발전시장에는 이미 지난 1990년대말부터 진출한 이래 지난 2004년 인도 시파트 석탄화력발전소를 수주해 주목을 받은 바 있고, 올해 초에는 1,370MW (685MW 2기) 규모의 라이푸르-차티스가르(Raipur-Chhattisgarh) 석탄화력발전소를 수주해 인도발전시장에서 위상을 높이고 있다.

• 한국신재생에너지학회:학술대회논문집
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• 2010.06a
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• pp.181.2-181.2
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• 2010

포항공과대학교 풍력특성화대학원에서는 STX Windpower의 풍력발전기 국산화 사업의 일환으로 2MW 직접 구동형 영구자석 동기발전기의 설계를 변경 하였다. 정격 출력 2.3MW급으로 정격 RPM은 16.5, 고정자 내경은 2.1m로 128극을 가지고 있다. 본 설계 발전기는 STX93 모델을 기반으로 하고 있으며, 기존 발전기보다 더 compact하고 더 높은 효율의 발전기로 설계 변경하였다. 본 논문에서는 발전기 물리 설계와 그에 따른 전자기 해석 및 열 분석을 수행하고 손실을 계산한다. 또한, 그 결과와 절차에 대하여 요약하고 기존 발전기와 설계 발전기를 비교 분석한다.