• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.1161_1162
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• 2009

The recent environmental protection trend requires more strict energy saving, therefore every transportation system should reduce energy consumption to the minimum value. High-efficiency operation system, energy saving and $CO_2$ emissions shall be addressed as important issue in railway system. These issues are the most essential factors of railway, compared to major public transportation system. Recently, saving energy in the electric railway system has been studied. For such new energy saving, the energy storage system is considered for saving energy. Energy saving is possible by efficient use of regenerated energy. Regenerated energy is recycled amongst vehicles by mean of charge and discharge corresponding to powering and braking of electric vehicle operations. This energy saving contributes to cut $CO_2$ to reduce greenhouse gas emissions. Recycling regenerated energy demonstrate significant effect on peak cut of consumption energy in railway substation. Absorption of excess energy avoids regeneration failure due to high traction voltage. Therefore, the energy storage system is needed to be adopted to use regeneration energy when the vehicle is braking.

• 대한방사선방어학회:학술대회논문집
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• 대한방사선방어학회 2009년도 춘계 학술발표
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• pp.164-165
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• 2009

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• Medical Lasers
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• 제10권4호
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• pp.195-200
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• 2021

Evidence shows that nerve injury triggers mitochondrial dysfunction during axonal degeneration. Mitochondria play a pivotal role in axonal regeneration. Therefore, normalizing mitochondrial energy metabolism may represent an elective therapeutic strategy contributing to nerve recovery after damage. Photobiomodulation (PBM) induces a photobiological effect by stimulating mitochondrial activity. An increasing body of evidence demonstrates that PBM improves ATP generation and modulates many of the secondary mediators [reactive oxygen species (ROS), nitric oxide (NO), cyclic adenosine monophosphate (cAMP), and calcium ions (Ca²⁺)], which in turn activate multiple pathways involved in axonal regeneration.

• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2008년도 추계학술발표대회 논문집
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• pp.120-125
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• 2008

Many countries are faced with problems of energy demand and environmentally. Renewable energy is the interesting solution to deal this problems. In Korea, it is planed to apply the renewable energy to 5% of total energy demand by 2011. For this, the government has supported by various promotion program of renewable energy Policy Consideration of renewable energy system is essential for sustainable urban regeneration. Renewable energy application will be possible to make friendly environmental and sustainable city and deal with the energy and environment problem. This study will provide fundamental data to applying renewable energy systems for urban generation. There are evaluated for economic feasibility of renewable energy systems and analyzed application of them by building type as a urban energy source.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2009년도 춘계학술대회 논문집
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• pp.1461-1467
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• 2009

The electric railway is a clean and energy saving system, because it requires relatively less energy than automobiles by transporting the same passengers or goods. Six thousands of vehicles are operated on Korean urban transit system. This system is 95% of regeneration system. Especially, the VVVF-Inverter vehicle has a merit of the highest regeneration rate. Energy consumption is 90% for traction and 10% for auxiliary supply. Braking energy is about 40% of energy consumption. Up to 40% of the tractive power of vehicles capable of returning energy to the power supply can be regenerated during braking and that this energy can be used to feed vehicles which are accelerating at the same time. The energy generated by braking vehicle would simply be converted into waste heat by its braking resistors if no other vehicle is accelerating at exactly the same time. Such synchronized braking and accelerating can not be coordinated, the ESS(energy storage system) stores the energy generated during braking and discharges it again when a vehicle accelerates. This paper presents field tests about the energy saving rate of the developed ESS. when the ESS is on/off, energy saving rate of the ESS is tested. The verification test in the field focused on energy saving.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2005년도 춘계학술대회논문집
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• pp.443-448
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• 2005

This paper proposed a regeneration inverter system, which can regenerate the excessive power form dc bus line to ac source for traction system. The proposed regeneration inverter system for dc traction can reduce harmonics which are include to ac current source. The regenerative inverter is operated as two modes. As a regeneration inverter mode, it can recycle regenerative energy caused by decelerating tractions and as an active power filter mode, it can compensate for harmonic distortion produced by the rectifier substation. In the paper, a regeneration inverter used PWM DC/AC converter algorithm. And an active power filter used p-q theory. The simulation was composed as a prototype model[3kW]. Simulation results show that two algorithm can be used to real model[100kW]. Finally, the inverter was successfully operated as regeneration mode.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2004년도 전력전자학술대회 논문집(1)
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• pp.439-442
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• 2004

This paper described a dc power system, which can generate the excessive do power form do bus line to ac source in substation for traction system. The proposed regeneration inverter system for dc traction can be used as both an inverter and an active power filter(APF). As a regeneration inverter mode, it can recycle regenerative energy caused by decelerating tractions and as an active power filter mode, it can compensate for harmonic distortion produced by the rectifier substation.

• 공업화학
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• 제31권3호
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• pp.341-345
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• 2020

하폐수처리 및 정수처리에 사용되는 활성탄 흡착 공정에서 기존의 활성탄 열재생법 비해 활성탄 손실과 불완전 연소로 인한 오염물질 발생도 적으며, 사용 활성탄의 인발-재생-재충진에 소요되는 시간의 절약이 가능한 재생 방법으로 오존수를 이용한 in situ regeneration에 대한 기초연구를 수행하였다. 활성탄 흡착 컬럼 상에서 페놀(phenol) 및 PEG를 흡착 파과 시킨 후 오존수 접촉으로 흡착물질을 분해 제거하는 흡착-재생 싸이클을 반복하였다. 오존수 접촉에 의한 재생 횟수가 증가할수록 페놀 흡착용량은 어느 정도 감소하지만, 일정 수준으로의 감소 후에는 구조 변화가 안정화되어 추가적인 감소가 일어나지 않았다. 흡착 용량이 감소하는 이유는 오존과의 반응에 의해 활성탄의 미세공 크기가 증가하면서 비표면적이 감소하기 때문으로 나타났다. 이러한 세공 크기의 변화와 비표면적의 변화로 인하여 재생 후 in-pore adsorption이 우세한 페놀과 같은 저분자량 물질의 흡착효율은 감소하게 되나 external adsorption 비율이 큰 PEG와 같은 고분자량 물질의 흡착효율은 크게 영향을 받지 않았다. 세공 크기 및 비표면적의 변화는 오존수와의 접촉시간이 길어질수록 심화되므로 제거하려는 물질의 크기를 고려하고 접촉시간을 조절함으로써 흡착 효율의 유지를 제어하는 것이 필요하다.

• Korean Chemical Engineering Research
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• 제49권6호
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• pp.764-768
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• 2011

모노에탄올아민(MEA)으로 대표되는 습식 아민을 이용한 이산화탄소 포집 공정은 기술적 신뢰도가 높아 초기 CCS(Carbon Capture & Storage) 시장을 주도할 것으로 전망된다. 다만 흡수제 재생에 에너지 소비가 많은 점이 단점으로 지적 받고 있어 흡수제 재생 에너지 절감을 위한 다양한 공정 개선안이 연구되고 있다. 본 논문에서는 MEA 공정에서 흡수탑으로 유입되는 배가스를 분할 유입하는 공정 개선안을 제안 하고 시뮬레이터를 이용한 공정모사를 통하여 그 효과를 보였다. 배가스를 분할 유입한 결과 흡수탑 하단부에서 냉각효과가 있었고 이로 인해 흡수제 유량이 감소하였다. 배가스 분할 비와 분할 유입 단 높이를 변경하며 최적 분할 조건을 찾았으며 이때 흡수제 유량은 6.4%, 재생 에너지는 5.8% 감소하였다.

• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2008년도 춘계학술발표대회 논문집
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• pp.287-293
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• 2008

As the instability of international societies on the energy resources has increasingly been deepened due to excessive use of fossil fuels, the importance of energy saving and global environment protection has highlighted, So the interests in environment-friendly and stable new & renewable energy have been dramatically increased. The studies on reconstructing the old-fashioned towns economically, socially and physically have been also significantly increased. In this urban regeneration, renewable-energy using systems were aggressively applied to overcome the energy and environmental problems of the existing towns. There have been many of studies on the compound applications of the renewable-energy using systems in the advanced countries while they are insufficient in Korea. As a preliminary study of urban renewable-energy using system development, this paper surveyed the foreign cases applied to key technologies such as geothermal energy, hydrogen fuel cell and bioenergy among the renewable-energies in urban built environment.