• The Journal of the Korea institute of electronic communication sciences
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• v.10 no.11
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• pp.1271-1276
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• 2015

The recent trend is that diesel power generation on islands where its prime cost for power generation is high is replaced by new and renewable energy. Therefore, south Jeolla province is progressing the construction project of self-sufficient islands for the areas where power is supplied by depending on diesel generators, which is the project that power is supplied through eco-friendly energy source using sunlight, wind power and energy storage device etc. However, it is difficult to construct new and renewable energy source with the capacity to respond to the load perfectly due to its environmental and geographical conditions regarding capacity design of new and renewable energy. Besides, Microgrid design considering appropriate capacity design of the system components and efficient operation is required through the analysis of climate conditions and load patterns from the design stage for optimal composition of a hybrid system with economic feasibility. Therefore, this study is aimed to conduct a research on optimal combination, capacity calculation and economic feasibility by comprising a hybrid power generation system which will replace 40% of power generation by diesel as new and renewable energy source for Geomun Island where has more than 300 households and requires expansion of the facility among islands located in southwest coast.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.44 no.7
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• pp.585-592
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• 2016

Visualization was done by using $CH^*$ chemiluminescence images and PMT measurements in order to understand the origin of fluctuating pressure and chemical luminosity at about 500 Hz frequency even in stable combustion, which was observed in recent experimental tests, and to find the physical correlation leading to Low Frequency Instability(LFI) in terms of phase angle. In stable combustion, chemical reactions are distributed along the shear layer flow showing a negative coupling(about 180 degree in phase angle) with combustion pressure. However, phase difference is shifted to a positive coupling showing less than 90 degree in unstable case. Also a periodic change in the distribution of chemical reactions is observed along with local flame extinction and the appearance of big scale vortex flow. In the transition to LFI, local flame extinction and small vortex flow start to appear in a row. As seen in the bluff body wake in reactive flow, the periodic appearance of vortex flow seems to share the same physical process of BVK(Bernard Von Karman) instability generation. Thus, the appearance of local extinction in 500 Hz fluctuations is gradually amplified to complete extinctions of about 20 Hz, and it leads into LFI.

• 전기의세계
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• v.43 no.7
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• pp.7-22
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• 1994

잠수함추진방식은 크게 원자력 추진과 재래식 추진으로 나눌수 있다. 최근에는 재래식 추진방식과 하이브리드 개념으로 운용될 수 있는 AIP(air independent propulsion)방식도 활발히 연구되고 있다. AIP 추진으로는 폐회로 디젤기관추진(closed cycle diesel engine propulsion), 연료 전지추진(fuel cell propulsion) 스터링기관추진(stirling engine propulsion) 및 폐회로터빈추진(closed cycle turbine propulsion)등이 있다. 이러한 잠수함 추진체계에 대해 앞으로 크게 세부분으로 나누어 그 현황과 발전추세를 살펴보고자 한다.

• The Optical Journal
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• s.135
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• pp.31-34
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• 2011

광학 속성을 가진 폴리머 소재는 새롭고 정교한 전자광학 장치를 가능하게 해주고, 커머셜 마켓과 의학 용품, 바코드 인식, 보안과 지문 추출기, 동작 인식 센서, CCD 카메라 및 레이저 collimation 장치들을 가능하게 한다. 현재의 발전된 폴리머 기술과 인젝션 몰딩 기술은 높은 생산성과 정밀도를 향상시켜 왔다. 본 고는 이러한 폴리머-하이브리드 옵틱 기술에 관한 최신 동향으로서 Optronics 340호에서 발췌, 정리한 것이다.

• 전기의세계
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• v.38 no.2
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• pp.5-16
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• 1989

신경컴퓨터에 대한 연구는 1940년대부터 시작되었다. 이 신경 컴퓨터는 현재 패턴 인식, 음성인식 분야에서 성공적인 결과를 제시하고 있으며, 기존의 컴퓨터보다 우월한 응용 분야로 생각되어지는 분야로는 학습, 인식 등으로서 정밀도를 요하는 수학적 계산 분야는 디지탈 컴퓨터가 역시 우세하다. 따라서 장래의 컴퓨터는 기존의 디지탈 컴퓨터와 신경 컴퓨터가 하이브리드 형태로 된 것으로 발전할 것이다.

• Proceedings of the SAREK Conference
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• 2009.06a
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• pp.368-368
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• 2009

• Journal of Drive and Control
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• v.8 no.1
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• pp.44-49
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• 2011

• The KSFM Journal of Fluid Machinery
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• v.11 no.3
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• pp.81-90
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• 2008

• Venture DIGEST
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• s.137
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• pp.22-24
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• 2009

전기가 없는 세상은 상상하는 것만으로도 머리가 지끈거리는 일이다. 전기는 편리한 삶을 보장해주기도 하지만 뜨거워진 지구를 더 뜨겁게 달구는 주원인이기도 하다. 여기 뜨거운 지구를 식혀 줄 전기에너지를 만드는 방법에 몰두하는 사람들이 있다. 몸을 움직여서 전기를 만드는 방법을 연구해 자가발전 운동시설과 하이브리드 자전거를 생산하는 친환경 벤처기업 이앤에이치씨(주)(대표 송동하, www.enhc.co.kr)를 소개한다.

• Land and Housing Review
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• v.5 no.2
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• pp.99-106
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• 2014

The purpose of this study is to develop hybrid energy blocks with piezoelectric and electromagnetic induction method. The developed energy block is able to be applied to the housing and facilities in the city and is suitable to adjust the characteristics of facilities. To develop the hybrid energy block, we analyzed the characteristics and requirements of various energy block types and drew improvement and application method to develop energy blocks. We compared and analyzed the characteristics and performance of the prototype energy blocks and the developed hybrid energy blocks. According to result of the comparison and analysis, the developed energy block shows higher performance of 12.7 times for adding one vibration and 28.9 times for five consecutive vibrations than that of a existing prototype energy block. This is consistent with research purposes for W-level electrical energy production. Thus, the new energy block will likely be possible to apply to the housing and urban facility.