• Title/Summary/Keyword: cost of capital

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Optimal Configuration Algorithm for ESS with Renewable Energy Resources Considering Peak-shaving Effects (신재생 에너지가 도입된 전력저장장치의 첨두부하절감 효과를 고려한 최적 구성 알고리즘)

  • Lee, Na-Eun;Kim, Wook-Won;Kim, Jin-O
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.63 no.9
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    • pp.1199-1205
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    • 2014
  • A power system configuration has been increasingly advanced with a number of generating units. In particular, renewable energy resources are widely introduced due to the environmental issues. When applying the renewable energy sources with the ESS (Energy Storage System), the ESS is the role of a potential generating resource in the power system while mitigating the output volatility of renewable energy resources. Thus, for applications of the ESS, the surrounding environment of it should be considered, which means that capacity and energy of the ESS can be affected. Moreover, operation strategy of the ESS should be proposed according to the installation purpose as well as the surrounding environment. In the paper, operation strategy of the ESS is proposed considering load demand and the output of renewable energy resources on a hourly basis. Then, the cost of electrical energy is minimized based on the economic model that consists of capital cost, operation cost, fuel cost, and grid cost for a year. It is sure that peak-shaving effects can be achieved while satisfying the minimum cost of electrical energy.

An Optimal Decision Model for Capacity and Inclining Angle of Residential Photovoltaic Systems (주택용 태양광발전시스템의 적정 용량 및 설치각 선정을 위한 최적화 모델 연구)

  • Jeon, Jeong-Pyo;Kim, Kwang-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.6
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    • pp.1046-1052
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    • 2010
  • In residential house, photovoltaic (PV) system among various alternatives in renewable energy system is the most efficient and feasible solution for reducing energy consumption and electricity cost. However, relatively high initial cost make people reluctant to install PV system in their houses. Therefore, in the initial state for PV system installation in the house, it is very important to decide proper capacity of the PV system considering the expected energy usage and solar energy supplying condition with the house. This paper proposes a novel optimization model for deciding appropriate capacity of the PV system for residential house. The objective function of the model is to minimize the annual cost including electricity bill, operation and maintenance cost, and annual fixed cost calculated from the initial installation cost based on capital recovery factor (CRF). The model also shows the optimal inclining angle of PV panels of the system. In this paper, we estimate the PV output using PVWATTS (PV simulator of Office of Energy Efficiency and Renewable Energy) and find optimal solutions by Sequential Quadratic Programming (SQP) method using MATLAB software. The proposed approach is finally applied to a residential model house in Gangneung, Gangwon-Do and verified its feasibility for adopting to PV system design for residential houses.

Economic Analysis of Power Transmission Lines using Interval Mathematics

  • Teegala, Srinivasa Kishore;Singal, Sunil Kumar
    • Journal of Electrical Engineering and Technology
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    • v.10 no.4
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    • pp.1471-1479
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    • 2015
  • A major portion of the capital costs in the present day power transmission systems are due to the cost of equipment and construction process. Transmission utilities in the recent years are drawing greater attention towards performing life cycle costing studies for cost management and decision making. However, the data involved in these studies are highly uncertain and the effect of these uncertainties cannot be directly included in the study process, resulting in inaccurate solutions. Interval mathematics provides a method for including these uncertainties throughout the cost analysis and provides final solution range in the form of intervals. In this regard, it is essential and extremely important that significant research has to be carried out in understanding the principles of life cycle costing methodology and its applicability to cost analysis of transmission lines along with uncertainties involved in the cost assessment process. In this paper, economic analysis of power transmission lines using interval mathematics has been studied. Life cycle costing studies are performed using net present value analysis on a range transmission lines used in India and the results are analyzed. A cost break even analysis considering right of way costs was carried out to determine the point of economy indifference.

Workforce Entry Preparers' Post-College Housing Expectations and Perception of Housing Cost Burden (예비 사회진출자의 졸업 후 주거에 대한 기대 및 주거비 부담에 대한 인식)

  • Lee, Hyun-Jeong
    • Journal of the Korean housing association
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    • v.24 no.4
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    • pp.29-37
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    • 2013
  • The purpose of this study was to explore college students' expectations on post-college housing and sources of finance to afford housing costs; and perception of housing cost burden. Between May 28, 2012, and June 17, 2012, a questionnaire survey was conducted to undergraduate students in university-A located in non-capital region and 465 useable responses were collected. Major findings are as follows: (1) About 60% of respondents expected to live apart from their parents or relatives within two years from college graduation; (2) Majority of respondents who expected to live apart from their parents or relatives expected to rent housing units and compact non-traditional housing types such as studio units; (3) Major source of finance the respondents expected to afford post-college housing costs was financial supports from their parents and families; (4) Housing cost burden were perceived to have influence even on job decision and respondents with lower parents' income perceived housing cost burden more influential; and (5) In spite of respondents' low financial independence to afford post-college housing costs, finding housing units in areas with relatively lower housing costs seemed not to be an important consideration when choosing post-college housing.

Network Costing Model Alternatives for Reasonable Interconnection Charging Between Networks (합리적 접속료산정을 위한 통신망비용모형 수립방안)

  • 권수천
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.4 no.5
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    • pp.907-917
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    • 2000
  • In this paper the network costing model alternatives for reasonable interconnection charging are suggested. The current interconnection charge regimes is based on fully distributed costing method. Basically this method doesn't consider the common carrier's efficient network cost because it reflects the actual cost of network In this paper, 1 suggest the basic structure of the network costing model fur applications of incremental costing method that considers the efficient cost based on economics-prospective. And I classify network cost with capital cost and operating cost and analysis their reasonable costing methods.

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A Study on the Economic Life Cycle of Training Airplane in 'H' University ('H'대학교 훈련용 항공기의 경제적 수명주기에 관한 연구)

  • Chang, Jo-Won;Choi, Se-Jong;Eun, Hee-Bong
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.10 no.1
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    • pp.57-68
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    • 2002
  • The economical aspects should be evaluated to decide the LCC(Life Cycle Cost) of the long life facilities or equipments. Airplane operators evaluate the economical aspects to decide whether they maintain the existing airplane or substitute the new one. This paper presents economic life cycle and economic life cost for both Cessna 172R and Mooney 20J that are operated for flight training in 'H' University. The residual value that is used to calculate the capital recovery rate of the airplane is calculated based on the data from Blue Book published in USA. The annual equivalent on operation cost is calculated based on the 500 flight hours per year which is the annual flight hour for the airplane in 'H' university. This paper showed that economic life cycle of Cessna 172R is nine years since it was introduced in 2001, and Mooney 20J which was introduced in 1991 exceeds the economic life cycle in 2002.

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Time-Varying Systematic Risk of the Stocks of Korean Logistics Firms

  • Kim, Chi-Yeol
    • Journal of Navigation and Port Research
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    • v.41 no.2
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    • pp.71-78
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    • 2017
  • This paper aims to investigate the time-varying systematic risk of the stocks of Korean logistics firms. For this purpose, the period from January 1991 to October 2016 was examined with respect to 21 logistics companies that are listed on the Korea Exchange. The systematic risk of the logistics stocks is measured in terms of the Capital Asset Pricing Model (CAPM) beta for which the sensitivity of a stock is compared to the return changes of the whole market. Overall, the betas of the stocks of the Korean logistics companies are significantly lower than those of the market unity; however, it was revealed that the logistics betas are not constant, but are actually time-varying according to different economic regimes, which is consistent with the previous empirical findings. This finding is robust across different measurements of the logistics betas. In addition, the impact of macroeconomic factors on the logistics betas was examined. The present study shows that the logistics betas are positively associated with foreign exchange-rate changes.

Quantitative examination of the Korean Textile Complex (통계자료에 의한 섬유산업의 이해)

  • Ye, Hae-Kyung
    • Journal of Fashion Business
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    • v.1 no.1
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    • pp.43-52
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    • 1997
  • The main purpose of this study was to examine the sectors of Korean textile complex based on various economic characteristics and performances. The sectors in the textile complex differed in many aspects. Man-made fiber industry showed capital-intensive characteristics even though most of the sectors in the textile complex were labor-intensive. Textile industry is composed of weaving and spinning, knitting, dyeing and finishing sectors and even within the textile industry, each sector had different characteristics from each others. Weaving and spinning sector seemed to require relatively high capital investment, while dyeing and finishing was very labor-intensive. Labor-intensive apparel industry has faced decrease in labor-productivity while wage has increased. Slow growth in labor productivity in Korean textile complex was shown to be a more problem than increase in wage or ratio of labor cost to value added. Apparel companies appeared to be in better financial states than the textile companies, even though the exports of apparel products have decreased in the 1990s. However, in overall the financial states of the Korean textile complex were not as strong as those of the other manufacturing sectors.

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A Study on the Reasonable Standard of Location;allocation for a new administrative center in provincial area (광역지방행정중심지(廣域地方行政中心地)의 선정(選定)을 위한 합리적(合理的) 입지기준(立地基準)에 관(關)한 연구(硏究))

  • Yoon, Jun-Sang
    • Journal of Agricultural Extension & Community Development
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    • v.5 no.1
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    • pp.93-102
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    • 1998
  • The objectives of the study were 1) to make the reasonable standard, 2) to select the objective and scientific method and process for the location-allocation of a new provincial capital city. The Main standard of location-allocation were suggested as follows ; 1) Integration of province 2) Convenience of Administration service 3) Accomodations of new provincial capital city 4) Balanced development by region. The validity of location-allocation were reviewed the population potentials and nodal accessibilities. The population potential was examined to find the maximum point of administrative demand, and the locationallocation model was examined to find the minimum point of the aggregated travel-cost to a proposed provincial government office. The nodal accessibilities measured in travel-time distance and actual values. Two major concerns in locating public facilities are efficiency and equity.

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A Study on the Measurement of Voluntary Disclosure Quality Using Real-Time Disclosure By Programming Technology

  • Shin, YeounOuk;Kim, KiBum
    • International journal of advanced smart convergence
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    • v.7 no.2
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    • pp.86-94
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    • 2018
  • This study focuses on presenting the IT program module provided by real - time forecasting and database of the voluntary disclosure quality measure in order to solve the problem of capital cost due to information asymmetry of external investors and corporate executives. This study suggests a model of the algorithm that the quality of real - time voluntary disclosure can be provided to all investors immediately by IT program in order to deliver the meaningful value in the domestic capital market. This is a method of generating and analyzing real-time or non-real-time prediction models by transferring the predicted estimates delivered to the Big Data Log Analysis System through the statistical DB to the statistical forecasting engine.