• 제목/요약/키워드: Total annual cost

검색결과 238건 처리시간 0.036초

TRELSS를 이용한 KEPCO 계통의 공급지장비 추정연구 (Area Annual Outage Cost Assessment of KEPCO System by TRELSS)

  • 사박;정상헌;박정제;최재석;전동훈;윤용범;장병훈;문승필;한경남
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2007년도 제38회 하계학술대회
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    • pp.578-579
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    • 2007
  • The importance and necessity of conducting studies on area outage cost assessment have been increasingly important in recent years due to the competitive electricity market environment. The objective of operational issues would be to minimize the total area cost while satisfying all associated system constrains of each area[2]. This paper presents a methodology of the Area annual outage cost assessment by probabilistic reliability evaluation using TRELSS program for KEPCO system. The interrupted energy assessment rate (IEAR) is evaluated by macro approach that is using relations between GRDP and the electrical energy demand. The Expected Energy Not Supplied (EENS) of each area was evaluated using the Transmission Reliability Evaluation for Large-Scale Systems (TRELSS) Version 6_2, a program developed by EPRI are introduced in this paper.

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The significance of proxies for agency costs under different governance approaches

  • Shin, Yang-Gyu;Reddy, Krishna
    • Journal of the Korean Data and Information Science Society
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    • 제21권2호
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    • pp.327-333
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    • 2010
  • This study examines the impact different proxies of agency costs have on companies under different governance approaches. The two specific proxies of agency costs used include: (i) the ratio of operating expenses to annual sales; and (ii) the ratio of annual sales to total assets. Our study is based on earlier works of Ang et al. (2000) and Fleming et al. (2005). A comparison of results for small unlisted companies both in US and Australia indicate that agency cost measures have statistically: (1) different result under rule-based governance mechanisms; and (2) the same results under principle-based governance mechanisms. Our findings support the view that the effectiveness different measures of agency cost is dependent on country specific governance facto as well as on the governance approaches adopted. Our results offer insights to both practitioners and policy makers regarding the usefulness of different proxies of agency costs when companies adopt principle-based corporate governance approaches versus rule-based approaches.

Theoretical Design for the Production of Quinoa (Chenopodium quinoa Willd.) in a Closed Plant Factory

  • Bae, Jong Hyang;Austin, Jirapa;Jeon, Yoon-A;Cha, Mi-Kyung;Cho, Young-Yeol
    • 원예과학기술지
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    • 제34권6호
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    • pp.840-844
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    • 2016
  • Quinoa (Chenopodium quinoa Willd.) is a grain crop with high nutritional value. The leaves and sprouts of quinoa can also be consumed either raw or cooked, providing considerably nutritional value as well as high antioxidant and anticancer activities. This study was carried out to obtain basic data to assist in the practical design of a plant factory with artificial lighting for the cultivation of quinoa as a leafy vegetable. We estimated the energy content of the quinoa and the electrical energy required to produce this crop. The yield was 1,000 plants per day, with a planting density and light intensity of $0.015m^2$ ($15{\times}10cm$) and $200{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$, respectively. The total number of plants, cultivation area, and electricity consumption were estimated to be 25,000, $375m^2$, and $93,750{\mu}mol{\cdot}s^{-1}$, respectively. White fluorescent lamps were used at a power of 20.4 kW from 1,857 fluorescent lamps (FL, 55 W), and the cost for electricity was approximately 1,820 dollars (exchange rate of $1 = 1,200 won) per month. For a daily harvest of 1,000 plants per day in a closed plant factory, the estimated light installation cost, total installation cost, and total production cost would be 15,473, 46,421, and 55,704 dollars, respectively. The calculated production cost per plant, including labor costs, would be 27 cents for the 25-day cultivation period, with a marketable ratio of 80%. Considering the annual total expenses, income, and depreciation costs, the selling price per plant was estimated to be approximately 56 cents.

메탄올-아세톤 분리를 위한 압력 변환 증류 공정에서 환류를 통한 유입 조성 최적화 (Optimal feed compositon of pressure swing distillation system to separate methanol and acetone)

  • 윤영각;서승권;이철진
    • 플랜트 저널
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    • 제13권3호
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    • pp.26-29
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    • 2017
  • 본 연구에서는 메탄올-아세톤 압력 변환 증류 공정에서 유입 흐름의 조성 최적화를 진행하였다. 압력 변환 증류 공정에서 유입 흐름의 조성은 혼합물 분리가능성에 지대한 영향을 주는 것이 잘 알려져 있다. 분리된 순수한 물질의 환류흐름을 이용하여 유입 흐름의 조성을 조절하여 정해진 압력에서 보다 나은 분리효율을 보이는 것을 이번 연구의 목적으로 한다. 환류 흐름이 없는 압력 변환 증류 공정을 기본 공정으로 하여, 메탄올의 환류 흐름이 있는 경우와 아세톤의 환류 흐름이 있는 경우 두 가지 공정이 설계되었다. 각 공정은 Total annual cost로 비교되었으며, 그 결과 환류 흐름이 없는 기본 공정이 가장 유리한 것으로 나타났다.

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Reliability assessment of RC shear wall-frame buildings subjected to seismic loading

  • Tuken, Ahmet;Dahesh, Mohamed A.;Siddiqui, Nadeem A.
    • Computers and Concrete
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    • 제20권6호
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    • pp.719-729
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    • 2017
  • A considerable research is available on the seismic response of Reinforced Concrete (RC) shear wall-frame buildings, but the studies on the reliability of such buildings, with the consideration of human error, are limited. In the present study, a detailed procedure for reliability assessment of RC shear wall-frame building subjected to earthquake loading against serviceability limit state is presented. Monte Carlo simulation was used for the reliability assessment. The procedure was implemented on a 10-story RC building to demonstrate that the shear walls improve the reliability substantially. The annual and life-time failure probabilities of the studied building were estimated by employing the information of the annual probability of earthquake occurrence and the design life of the building. A simple risk-based cost assessment procedure that relates both the structural life-time failure probability and the target reliability with the total cost of the building was then presented. The structural failure probability (i.e., the probability of exceeding the allowable drift) considering human errors was also studied. It was observed that human error in the estimation of total load and/or concrete strength changes the reliability sharply.

자가정미기(自家精米機)의 이용비용(利用費用) 분석(分析) (Cost Analysis of Small Capacity Farm-house Rice Whitener)

  • 박판규;윤홍선;박경규
    • Journal of Biosystems Engineering
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    • 제14권1호
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    • pp.41-48
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    • 1989
  • In order to provide a basic information for the government policy in the future, rice milling costs of Small Capacity Farm-house Rice Whiteners (SCFRW) were estimated by surveying and analyzing the major factors to affect their costs. Two types of SCFRW having one stage and two stage milling process and two rice varieties, Tong-il and Akibare, were considered for their cost estimation, respectively. Also, their costs were compared with those of Private Custom-work Mill in order to determine its economical feasibility. The results were concluded as follows; 1. Major factors to affect the costs were annual milling quantity, purchase price of SCFRW and grain milling loss. 2. Total milling costs of SCFRW were a function of annual milling quantity. These costs decreased rapidly as annual milling quantity increased. 3. In comparison of milling costs between single pass type and double pass type SCFRW, the former was more economical than the latter. 4. Also, in comparison of milling costs between two varieties by using SCFRW, Akibare was less expensive than Tong-il. 5. In comparison with private Custom-work Mill, both single pass and double pass type SCFRW were less economical than private Custom-work Mill. 6. In order to have an economical feasibility, SCFRW should be designed and developed to reduce its milling loss and purchase price.

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춘천시 주거지구내 수목피도의 차이가 난냉방에너지 이용 및 비용에 미치는 효과 (Effects of Difference in Tree Cover on Use and Cost of Heating and Cooling Energy in Residential Neighborhoods of Chuncheon)

  • 조현길;안태원
    • 한국조경학회지
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    • 제27권2호
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    • pp.19-28
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    • 1999
  • This study quantified shading, evapotranspiration and windspeed-reduction effects of trees on use and cost of heating and cooling energy in two residential neighborhoods of Chuncheon different in tree cover. Annual savings per residence of heating energy were approximately 1,210 MJ(1%) and those of cooling energy, 130 kWh(10%) in study district 1 having tree cover of about 10% . For district 2 with tree cover of about 20%, annual heating and cooling savings were 2,130 MJ(2%) and 180 kWh(19%) per residence, respectively. Trees annually saved energy costs by approximately ₩31,000 ($26, $1=₩1,200) per residence in district 1 and by ₩49,000($41) in district 2. One tree taller than 3 m resulted in annual energy savings of ₩8,000($7) in the study districts. Energy savings by trees in district 2, which had higher tree cover by 10% difference than district 1, were about 2 times greater than those in district 1. This implies that more tree plantings could enhance energy saving effects. Of the total costs saved, 58% was attributed to windspeed reduction and 47%, evapotranspiration. However, shading increased energy costs by 5% due to tree plantings at the wrong locations. Full tree plantings on the west and north of buildings and avoidance of shade-tree plantings of use of solar-friendly trees on the south are recommended to increase building energy savings efficiently.

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골프 코스관리 비용 분석 (Analysis of Maintenance Expense in various Golf Courses)

  • 유민준;이재필;주영규;김두환
    • 아시안잔디학회지
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    • 제23권1호
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    • pp.61-76
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    • 2009
  • 본 연구는 골프장의 적정 코스관리 비용을 구명하고 국내 골프장 29개의 홀당 내장객당 비용과 골프장 8개의 항목별 및 장소별 비용을 분석한 결과는 다음과 같다. 1. 홀 당 내장객이 증가할수록 홀 내장객당 비용이 감소하는 경향을 보여 주었다. 2. 골프장 코스관리 비용을 결정하는 인자는 연 내장객, 코스면적, 운영형태, 코스자동화 시설 등이다. 3. 골프장의 단위면적당 코스관리 비용은 869원이었다. 4. 8개 골프장의 홀 당 평균 코스관리 비용은 44,325,000원이었다. 5. 골프장 코스관리 비용 중 인건비 비중이 가장 높았으며 인건비중 그린의 볼마크 보수 인건비가 홀 당 평균 4,163,000원 (26%)으로 가장 높았다. 6. 골프장 총 코스면적의 평균 30% 정도를 차지하는 페어웨이에 사용되는 재료비가 총 재료비용의 $22%{\sim}44%$이며 그중 수입비료, 병충해 방제농약, 배토용 모래등의 구입비가 가장 많았다. 7. 총 코스면적의 평균 2% 정도를 차지하는 그린에 사용되는 재료비가 총 재료비용의 $28%{\sim}36%$이며, 입자형 비료, 미량원소비료, 토양개량제 등의 수입 제품으로 인해 그 구입비가 가장 많았다. 8. 농약 대용으로 미생물, 키토산 등의 친환경제제가 대신 사용된 경우 비용에서는 큰 차이가 없었다.

DRG 도입이 메디케어 의료비 증가억제에 미친 효과 (Impacts of the Implementation of the DRG Based Prospective Payment System on the Medicare Expenditures)

  • 김한중;남정모
    • Journal of Preventive Medicine and Public Health
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    • 제27권1호
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    • pp.107-116
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    • 1994
  • The United States adopted DRG based prospective payment system (PPS) in order to control the inflation of health care costs. No study used statistical test while many studies reported the cost containing effect of the PPS. To study impacts of the PPS on the Medicare expenditure, this study set the following three hypotheses (1) The PPS decelerated the increase in the hospital expenditure (Part A), (2) the PPS accelerated the increase in the expenditure of outpatients and physicians (Part B), (3) the increase in total expenditure was decelerated inspite of the spill over (substitution) effect because saving in the Part A expenditure were greater than losses in the Part B expenditure. The dependent variables are per capita hospital expenditure, per capita Part B expenditure, and per capita total expenditure for the Medicare beneficiaries. An intervention analysis, which added intervention effect to the time series variation on the Box-Jenkins model, was used. The observations included 120 months from 1978 to 1987. The results are as follows : (1) The annual increase in the per capita Part A expenditure was $5.11 after the implementation of DRG where as that before the PPS had been $11.1. The effect of the reduction ($5.99) was statistically significient (t=-3.9). (2) The spill over (substitution) effect existed because the annual increase in the per capita Part B expenditure was accelerated by $1.73 (t=1.91) after the implementation of the PPS. (3) The increase in the total Medicare expenditure per capita was reduced by $4.26 (t=-2.19) because the spill over effect was less than cost savings in the Part A expenditure.

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맞춤형 방문건강관리사업의 비용-편익분석 (A Cost Benefit Analysis of Individual Home Visiting Health Care)

  • 김진현;이태진;이진희;신상진;이은희
    • 지역사회간호학회지
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    • 제21권3호
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    • pp.362-373
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    • 2010
  • Purpose: The purpose of this study is to evaluate the costs and benefits of individual home visiting health care using secondary data and literature review. Methods: The total number of subjects was 1,008,837. A specific program was classified into disease management, care of infant, child and women, or elderly care. The costs and effects of a program were identified from a societal perspective, and the effects were converted into monetary terms or benefits. The total cost was calculated in the way that medical expenses, travel costs and productivity losses were offset by the decrease in benefits and thus only the program budget was included in the total cost. Results: The total program cost was 47.6 billion won per year and the total annual benefit was estimated at 435.6 billion won. The benefits of arthritis management were the biggest among disease management programs. The net benefit was 388.0 billion won per year and the benefit/cost ratio was 9.16. Conclusion: Home visiting health care was validated to be economically effective. It made a positive contribution to improving the health status of vulnerable populations and reducing medical expenses. These results suggest that home visiting care should be extended more broadly to vulnerable populations.