• 경영과학
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• 제30권2호
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• pp.97-106
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• 2013

Of the new and renewable energies currently being pursued domestically, wind energy, together with solar photovoltaic energy, is a new core growth driver industry of Korea. As of May 2012, 33 wind farms at a capacity of 347.8MW are in operation domestically. The purpose of this study was to compare and analyze how efficiently each operational wind farm is utilizing its power generation capacity and the weather resource of wind. For this purpose, the study proceeded in 3 phases. In phase 1, ANOVA analysis was performed for each wind farm, thereby categorizing farms according to capacity, region, generator manufacturer, and quantity of weather resources available and comparing and analyzing the differences among their operating efficiency. In phase 2, for comparative analysis of the operating efficiency of each farm, Data Envelopment Analysis (DEA) was used to calculate the efficiency index of individual farms. In the final phase, phase 3, regression analysis was used to analyze the effects of weather resources and the operating efficiency of the wind farm on the power generation per unit equipment. Results shows that for wind power generation, only a few farms had relatively high levels of operating efficiency, with most having low efficiency. Regression analysis showed that for wind farms, a 1 hour increase in wind speeds of at least 3m/s resulted in an average increase of 0.0000045MWh in power generation per 1MW generator equipment capacity, and a unit increase in the efficiency scale was found to result in approximately 0.20MWh power generation improvement per unit equipment.

• 자원ㆍ환경경제연구
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• 제30권2호
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• pp.325-345
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• 2021

본 논문은 원전 비중 축소와 신재생발전 비율 확대를 핵심 내용으로 하는 에너지 전환 정책의 잠재적 성과를 실증적으로 평가하고 그 파급효과를 분석하고자 한다. 발전산업을 대상으로 에너지원 간 수요가격탄력성을 측정하여 그 대체 여부 및 정도를 조사한 후, 원전과 신재생발전 비중 확대 시 CO₂ 발생량 변화를 추산한다. 원자력과 신재생에너지의 암묵가격을 산출하여 두 에너지원간 전력생산의 잠재적 비용을 비교하고, 원전 혹은 신재생발전을 각각 늘릴 경우 전력공급가격에 미치는 파급효과에 대한 시뮬레이션 분석을 실시한다. 원자력과 신재생에너지는 서로 보완적인 것으로 측정되었다. 원전 확대가 신재생발전을 늘리는 것보다 CO₂ 감축하는 데 효과적인 것으로 나타났다. 2002~2016년 기간에 걸쳐 대부분 연도에서 원전 확대의 전력공급가격 파급효과는 대체로 신재생발전보다 높게 추산되었으며 변동 폭은 상대적으로 크게 나타났다.

• ETRI Journal
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• 제37권2호
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• pp.295-305
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• 2015

The purpose of this paper is to a develop model for generation expansion planning that can support diverse environmental policies for the reduction of greenhouse gases (GHGs) of South Korea. South Korea is required to reduce its GHG emissions by 30% from the BAU level by 2020. The Wien Automatic System Planning Package currently used in South Korea has limitations in terms of the application of renewable energy policies and GHG targets; this paper proposes the use of an equipment planning model named generation and transmission expansion program, which has been developed to resolve such limitations. For verification of the model, a case study on the 6th Basic Plan of Long-Term Electricity Supply and Demand has been conducted. The results show that for the year 2020 South Korea's annual GHG emissions will be 36.6% more than the GHG Target Management System (GHG TMS) target set for the same year (30%). To achieve the GHG TMS target, the costs involved amount to about 72 trillion KRW (70 billion USD). Consequently, the South Korean government needs to review the performability of this target.

• Asian Pacific Journal of Cancer Prevention
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• 제15권19호
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• pp.8035-8040
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• 2014

Gastric cancer is the second after lung cause of cancer-related mortality in the world. Early detection and treatment can lead to a long survival time. Recently microarrays and next generation sequencing (NGS) have become very useful tools of comprehensive research into gastric cancer, facilitating the identification of treatment targets and personalized treatments. However, there are numerous challenges from cancer target discovery to practical clinical benefits. Although there are many biomarkers and target agents, only a minority of patients are tested and treated accordingly. Microarray technology with maturity was established more than 10 years ago, and has been widely used in the study of functional genomics, systems biology, and genomes in medicine. Second generation sequencing technology is more recent, but development is very fast, and it has been applied to the genome, including sequencing and epigenetics and many aspects of functional genomics. Here we review insights gained from these studies regarding the technology of microarray and NGS, how to elucidate the molecular basis of gastric cancer and identify potential therapeutic targets, and how to analyse candidate genes. We also discuss the challenges and future directions of such efforts.

• 복식
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• 제64권4호
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• pp.52-75
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• 2014

The purpose of this research is to classify the historical features of mid-to-late twentieth century Korean fashion with a focus on 'Nora Noh', who is a first generation Korean fashion designer. The specific questions of this research are as follows: how did mid-to-late twentieth century Korean fashion and the Nora Noh brand develop and what is the relationship between the two? What are the important features of Korean women's fashion design in the mid-to-late twentieth century? What are the characteristics exhibited in each decade in Korean women's fashion and Nora Noh's fashion? This paper conducted the research by focusing on the Korean fashion development as a background of simplification in the way of dressing and specific historical incident. Researchers deployed a qualitative research method providing a systematic review of the previous studies by analyzing content as well as eleven oral statement interviews and the case study of Nora Noh. The result shows that Nora Noh is one of the first generation of Korean fashion designers who led fashion trend and system in Korea. The designer also influenced Korean commercial fashion in the 1970s and American fashion trends in the 1980s.

• 한국시스템다이내믹스연구
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• 제7권2호
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• pp.57-80
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• 2006

Nuclear technology made a great contribution to the national economy and society by localization of nuclear power plant design, and by stabilization of electricity price, etc. It is very important to conduct the retrospective analysis for the nuclear technology contribution to the national economy and society, but it is more important to conduct prospective analysis for the nuclear technology contribution. The term "technology value" is often used in the prospective analysis to value the result of technology development. There are various definitions of technology value, but generally it means the increment of future revenue or the reduction of future cost by technology development. These technology valuation methods are widely used in various fields (information technology or energy technology, etc). The main objective of this research is to develop valuation methodology that represents unique characteristics of nuclear power technology. The valuation methodology that incorporates market share changes of generation technologies was developed. The technology valuation model which consists of five modules (electricity demand forecast module, technology development module, market share module, electricity generation module, total cost module) to incorporate market share changes of generation technologies was developed. The nuclear power technology value assessed by this technology valuation model was 3 times more than the value assessed by the conventional method. So it was confirmed that it is very important to incorporates market share changes of generation technologies. The valuation results of nuclear power technology in this study can be used as policy data for ensuring the benefits of nuclear power R&D (Research and Development) investment.

• 경영과학
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• 제12권1호
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• pp.157-173
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• 1995

Hydro-electric power generation from multi-purpose dams has been playing important roles in the electric power supply network in Korea. Although the total share of hydro power in national electricity supply now becomes very small, the peak-shaving and frequency control capability of hydro power helps the power company enormously in maintaining the quality of power. But since the company that builds and operates the multi-purpose dams in Korea has to sell all the electricity produced to the monopolistic utility, there have been various problems in justifying the investment, designing pricing mechanism, and controlling operations of the power plants. In addition, economic evaluation of the hydro power has been distorted by a variety of reasons and hence it has been very difficult to encourage effective development and utilization of national water resources. To make the problem worse, both parties are public companies with X-inefficiency problems. Thus, changing environment requires to reengineer the system that governs hydro power generation. We address the problems of Korean hydro-electric power generation system in four areas: the investment justification process, the operations decison right of the hydro power plants, the pricing of the purchased-power, and the negotiation of contract revision. Then we propose improvement directions of new hydro-electric power system in view of static and dynamic efficiency, X-inefficiency and equity.

• KIEE International Transactions on Power Engineering
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• 제3A권1호
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• pp.35-41
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• 2003

To ensure resource adequacy in restructured electricity markets, policymakers have adopted installed capacity (ICAP) markets in some regions of the United States. These markets ensure that adequate generation exists to satisfy regional Loss of Load Probability(LOLP) criterion. Since the incentives created through ICAP mechanisms directly impact new generation and transmission investment decisions we examine one important factor that links ICAP markets with LOLP calculations;, determining the amount of ICAP credit assigned to particular generation units. First, we review and critique the literature on electric power systems' market failure resulting from demand exceeding supply. We then summarize the method of computing (the LOLP) as a means of assessing reliability and relate this method to ICAP markets. We find that only the expected value of available generation is used In current ICAP markets while ignoring the second and higher order moments, which tends to mis-state the ICAP value of a specific resource. We then consider a proposal whose purpose is to avoid this ICAP assignment issue by switching from ICAP obligations to options. We find that such a proposal may fail to not provide the benefits claimed and suffers from several practical difficulties. Finally, we conclude with some policy recommendations and areas for future research.

• 자원ㆍ환경경제연구
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• 제19권1호
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• pp.3-21
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• 2010

발전부문의 부분적인 민영화 이후 전력의 도매가격은 한계가격(system marginal price)으로 결정되고, 이 가격은 발전사의 발전량에 의해서 달라지기 때문에 발전사 입장에서는 완전히 외생적으로 결정되는 가격이라 보기 어렵다. 본고는 Harrison(1994), Levinsohn(1993) 등이 개발한 시장의 완전경쟁성이 유지되지 않을 때에도 기업의 생산성 변화와 규모수익성, 마크업률 등을 분석할 수 있는 모형을 한국의 화력발전소 자료에 적용하였다. 분석결과 규모수익은 거의 없으며, 마크업률은 발전소의 사용 에너지 유형에 따라 크게 다른 것으로 나타났다. 아울러 완전경쟁시장을 가정하는 통상적인 분석법에 비해 발전소의 생산성 변화율 계측치도 상당한 정도 차이를 보였다.

• 한국축산시설환경학회지
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• 제21권3호
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• pp.93-98
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• 2015

The objective of this study was to review application of next-generation sequencing (NGS) to investigate microbiome in the livestock sector. Since the 16S rRNA gene is used as a phylogenetic marker, unculturable members of microbiome in nature or managed environments have been investigated using the NGS technique based on 16S rRNA genes. However, few NGS studies have been conducted to investigate microbiome in the livestock sector. The 16S rRNA gene sequences obtained from NGS are classified to microbial taxa against the 16S rRNA gene reference database such as RDP, Greengenes and Silva databases. The sequences also are clustered into species-level OTUs at 97% sequence similarity. Microbiome similarity among treatment groups is visualized using principal coordinates analysis, while microbiome shared among treatment groups is visualized using a venn diagram. The use of the NGS technique will contribute to elucidating roles of microbiome in the livestock sector.