齒科用 石膏가 家兎의 顎骨損傷部 治癒에 미치는 影響

김성열(Kim Sung Yul) 대한구강악안면외과학회 1984 대한구강악안면외과학회지 Vol.10 No.2

The purpose of this experimental study was to observe the rate of resorption, tissue tolerance and influence of Plaster of Paris in the healing process of bony defect after implantation of Plaster of Paris in the mandible of rabbits. Twenty four hybrid white rabbits were divided into two groups; Experimental group was implanted with Plaster of Paris (measured diameter 4㎜, height 5㎜), and control group was filled with blood in the bony cavity. Each of the experimental and control animals were sacrificed on the 1st, 2nd, 3rd, 4th, 5th, 6th weeks postoperation and mandible was removed. After radiograph taking with dental periapical film, specimens of experimental group were fixed in 10% neutral formalin solution for 24 hours and decalcified with nitric acid mixed with formalin (1:9). And then embedded in paraffin, sectioned into 6μ thickness and stained H-E stain. The results of study were as follows: In the radiographic examination, Implanted Plaster of Paris resorbed partially on 1st week but complete resorption was occurred on 2nd weeks. Experimental group revealed more radiopacity in the bony defect than control group through 6 weeks. In the histopathologic examination. Localized inflammatory foreign body giant cell appeared on 2nd week. Calcium substance in the Plaster of Paris deposited on the new bone and pre-existing undamaged bony spicules from 4th week. Bony defect was almost filled with new bone on 6th week.

저항형 초전도한류기의 신뢰도 모델을 적용한 배전계통 신뢰도 평가에 관한 연구

김성열(Sung-Yul Kim),김욱원(Wook-Won Kim),김진오(Jin-O Kim) 대한전기학회 2011 전기학회논문지 Vol.60 No.3

Recently fault currents are increasing in a network. It is caused by increase in electric demand and high penetration of distributed generation with renewable energy sources. Moreover, distribution network has become more and more complex as mesh network to improve the distribution system reliability and increase the flexibility and agility of network operation. Accordingly, the fault current will exceed capacity of circuit breakers soon and all the various rational solutions to solve this problem are taken into account. Under these circumstances, superconducting fault current limiter(SFCL) is a new alternative in the viewpoint of technical and economic aspects. This study presents operation processes for a resistive-type of SFCL, and it proposes reliability model for the SFCL. When a SFCL is installed into a network, the contribution of decreased fault currents to failure for distribution equipments can be quantified. As a result, it is expected that a SFCL makes the reliability of adjacent equipments on existing network improve and these changes are analyzed. We propose a methodology to evaluate the reliability in the distribution network where a SFCL is installed considering a reliability model for resistive-type of SFCL and reliability changes for adjacent equipments which are proposed in this paper.

신재생에너지 계통 연계에 따른 송전망 Risk Level 평가에 대한 연구

김성열(Sung-Yul Kim),문상근(Sang-Kun Moon),김진오(Jin-O Kim) 한국조명·전기설비학회 2011 조명·전기설비학회논문지 Vol.25 No.2

A Renewable Portfolio Standard(RPS) is a regulation that requires the increased generation of energy from renewable energy sources such as solar, wind, fuel cell, small hydro, biomass and geothermal. By environmental, technical and these regulatory reasons, the amount of renewable energy sources will be increased in a network. However, it is hard to assess risk of a transmission network with large scale renewable energy sources because the output characteristics of renewable energies are intermittent. This paper evaluates effects of a transmission system with supplemental large scale renewable energies into the existing system. To evaluate these effects, a methodology for risk level of components in a network is proposed considering steady state and contingency N-1 in this paper. We consider line current and bus voltage in each state of a network.

저탄소 패러다임에 따른 구역전기사업자의 분산전원 최적 운영에 관한 연구

김성열(Sung-Yul),심헌(Hun-Shim),배인수(In-Su Bae),김진오(Jin-O Kim) 대한전기학회 2009 전기학회논문지 Vol.58 No.8

By development of renewable energies and high-efficient facilities and deregulated electricity market, the operation cost of distributed generation(DG) becomes more competitive. The amount of distributed resource is considerably increasing in the distribution network consequently. Also, international environmental regulations of the leaking carbon become effective to keep pace with the global efforts for low-carbon paradigm. It contributes to spread out the business of DG. Therefore, the operator of DG is able to supply electric power to customers who are connected directly to DG as well as loads that are connected to entire network. In this situation, community energy system(CES) having DGs is recently a new participant in the energy market. DG’s purchase price from the market is different from the DG’s sales price to the market due to the transmission service charges and etc. Therefore, CES who owns DGs has to control the produced electric power per hourly period in order to maximize the profit. If there is no regulation for carbon emission(CE), the generators which get higher production than generation cost will hold a prominent position in a competitive price. However, considering the international environment regulation, CE newly will be an important element to decide the marginal cost of generators as well as the classified fuel unit cost and unit's efficiency. This paper will introduce the optimal operation of CES’s DG connected to the distribution network considering CE. The purpose of optimization is to maximize the profit of CES and Particle Swarm Optimization (PSO) will be used to solve this problem. The optimal operation of DG represented in this paper is to be resource to CES and system operator for determining the decision making criteria.

신재생에너지 계통 연계에 따른 송전망 Risk Level 평가

김성열(Sung-Yul Kim),신제석(Je-Seok Shin),문상근(Sang-Kuen Moon),이고은(Go-Eun Lee),김진오(Jin-O Kim) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7

범국가적 환경규제와 신재생에너지 관련 기술 개발로 인해 친환경 분산전원의 보급이 확산되고 있다. 또한, 최근 신재생에너지 의무할당제(RPS: Renewable Portfolio Standards)의 도입 확산은 신재생에너지의 계통 연계를 배전계통에서부터 송전계통으로 확대시키는 요인으로 작용하고 있다. 따라서 대규모 신재생에너지의 송전계통 유입이 기술적으로 기존 계통에 미치는 영향을 평가하고 이에 적합한 계통 업그레이드 대책을 마련할 필요가 있다. 이에 본 논문에서는 신재생에너지의 계통 연계에 따른 송전망 Risk Level을 평가하는 기법을 제안한다.

7차 전력수급계획에 따른 송전계통 손실 분석에 관한 연구

김성열(Sung-Yul Kim),이여진(Yeo-Jin Lee) 대한전기학회 2018 전기학회논문지 P Vol.67 No.2

In recent years, decentralized power have been increasing due to environmental problems, liberalization of electricity markets and technological developments. These changes have led to the evolution of power generation, transmission, and distribution into discrete sectors and the division of integrated power systems. Therefore, studies are underway to efficiently supply power and reduce losses to each sector"s demand. This is a major concern for system planners and operators, as it accounts for a relatively high proportion of total power, with a transmission and distribution loss of 4-6%. Therefore, this paper analyzes the status of loss management based on the current transmission and distribution loss rate of each country and transmission loss management cases of each national power company, and proposes a loss rate prediction algorithm according to the long-term transmission system plan. The proposed algorithm predicts the demand-based long-term evolution and the loss rate of the grid to which the transmission plan is applied.

수요반응자원으로서 산업용 부하의 매집 우선순위 결정 기준에 관한 연구

김성열(Sung-Yul Kim),김동민(Dong-Min Kim) 대한전기학회 2016 전기학회논문지 Vol.65 No.6

Energy industry is undergoing a paradigm shift in customer participation in the smartgrid. Customers traditionally consume electrical power. But nowadays not only do they generate electricity from private distributed generations, they can participate in demand response programs with their negawatt power which means a theoretical unit of power representing an amount of energy saved. Therefore development of decision-making criteria for electric load aggregation becomes a greater consideration as an amount of energy saved from demand response resources increases. This paper proposes load aggregators’ decision-making criteria in the industrial sector where it made up the largest portion in demand response portfolio in order to assure reliability performance for demand response resources.

Grid Parity를 고려한 DC 전원 공급율에 따른 신재생에너지 계통 연계의 경제성 평가

김성열(Sung-Yul Kim),이성훈(Sung-Hun Lee),김진오(Jin-O Kim) 대한전기학회 2012 전기학회논문지 Vol.61 No.1

The growth in IT industry has brought a corresponding rise in the number of connected digital devices in the distribution network. These digital loads lead to AC to DC conversion losses in order to supply power to them. The more the renewable energies and plug-in electrical vehicles penetrated our lives, the more the electrical losses are caused by AC to DC conversion process. Hence, this paper suggests the methodology for evaluating the amount of power supplied according to the ratio of DC power supply and performs an economic analysis of DC distribution system considering grid parity. In here, the cost of carbon emission reduced by renewable energy is also concerned.

가족구성형태의 변화가 주택용 부하의 장기 전력수요예측에 미치는 영향 분석

김성열(Sung-Yul Kim) 대한전기학회 2015 전기학회논문지 Vol.64 No.9

Among the various statistical factors for South Korea, the population has been steadily decreased by lower birthrate. Nevertheless, the number of household is constantly increasing amid population aging and single life style. In general, residential electricity use is more the result of the number of household than the population. Therefore, residential electricity consumption is expected to be far higher for decades to come. The existing long-term load forecasting, however, do not necessarily reflect the growth of single and two-member households. In this respect, this paper proposes the long-term load forecasting for residential users considering the effect of changes of the housing type, and in the case study the changes of the residential load pattern is analyzed for accurate long-term load forecasting.

신뢰도 민감도 지수를 이용한 복합배전계통 내 초전도한류기의 최적 위치에 관한 연구

김성열(Sung-Yul Kim),김욱원(Wook-Won Kim),배인수(In-Su Bae),김진오(Jin-O Kim) 한국조명·전기설비학회 2010 조명·전기설비학회논문지 Vol.24 No.6

지속적인 전력수요 증가에 따라 대단위 발전설비가 증설되고 있다. 특히, 국제적인 친환경 기조에 따라 배전계통 내에 신재생 에너지를 기반으로 하는 분산전원이 급속히 확산되고 있다. 또한, 전력공급의 신뢰도 향상 및 계통 운영의 유연성을 위해서 배전계통이 망상 형태로 점점 복잡해지고 있는 실정이다. 이러한 변화는 사고시의 고장전류 크기를 증가시킨다. 따라서, 앞으로 고장전류는 현재 설치된 차단기의 차단 한계용량을 넘어설 것으로 예상된다. 이를 위한 해결책으로 보호설비의 교체나 용량증대 등을 들 수 있다. 하지만, 기술적?경제적인 측면을 고려해 볼 때 초전도한류기가 그 대안이 될 수 있다. 본 논문에서는 초전도한류기의 최적 위치를 선정하는 기법을 제안한다. 최적 위치는 초전도한류기의 복합배전계통 내 설치 위치에 따른 설비별 고장전류의 저감에 기초해 설비별 고장율을 재산정하고 이를 통한 수용가별 신뢰도 향상을 신뢰도 민감도 지수를 이용하여 산정한다. 또한, 수지형 계통 및 망상형 계통에 제안한 초전도한류기의 최적 위치 기법을 적용함으로써 그 타당성을 입증하였다. As electric power demand of customers is constantly increasing, more bulk power systems are needed to install in a network. By development of renewable energies and high-efficient facilities and deregulated electricity market, moreover, the amount of distributed resource is considerably increasing in distribution network consequently. Also, distribution network has become more and more complex as mesh network to improve the distribution system reliability and increase the flexibility and agility of network operation. These changes make fault current increase. Therefore, the fault current will exceed a circuit breaker capacity. In order to solve this problem, replacing breaker, changing operation mode of system and rectifying transformer parameters can be taken into account. The SFCL(Superconducting Fault Current Limiter) is one of the most promising power apparatus. This paper proposes a methodology for an optimal location of SFCL. This place is defined as considering the decrement of fault current by component type and the increment of reliability by customer type according to an location of SFCL in a distribution network connected with DG(Distributed Generation). With case studies on method of determining optimal location for SFCL applied to a radial network and a mesh network respectively, we proved that the proposed method is feasible.