• Title/Summary/Keyword: economic calculation

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A Study on the Development and Verification of a Korean-style Weekly Economic Activity Index(WEAI) Model in the Public Sector: By Analyzing Major Cases (공공부문 한국형 주간경제지수 모델 개발 및 검증에 관한 연구: 주요사례를 분석하여)

  • Song, Seokhyun
    • Journal of Information Technology Services
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    • v.20 no.5
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    • pp.177-187
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    • 2021
  • The global economy has been very difficult due to the recent impact of COVID-19. Korea is also pushing for strong quarantine policies such as K- quarantine and social distancing, but the economy is hardly recovering. In particular, the economic situation began to change rapidly depending on the export and domestic market, the public's interest in the economy increased, and companies became more sensitive. In order to estimate this rapidly changing economic situation, major advanced countries have also developed models that can periodically monitor the economy at the government level. Through this, by periodically reporting the economic trends, the public and companies can be aware of the economic trends to some extent. This study analyzed the cases of weekly business trends in advanced countries and developed a model of weekly economic activity suitable for Korea. To verify this, indices closely related to the economy such as mobility, industrial activity, face-to-face consumption, and psychology were discovered and estimated. As a result of the study, the weekly economic activity index was judged to be very useful in capturing short-term real economic activity. In the future, in order to secure the robustness and stability of the index and to increase the reflection of reality, model improvement and parameter estimation should be performed regularly.

Development and Evaluation of High-precision Earth-work Calculating System using Drone Survey (드론을 활용한 고정밀 토공량 산출 시스템 개발 및 평가)

  • Kim, Sewon;Kim, YoungSeok
    • Journal of the Korean Geosynthetics Society
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    • v.18 no.4
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    • pp.87-95
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    • 2019
  • Earth-work calculation is the important data for estimating the optimal construction cost at the construction site. Earth-work calculations require the accurate terrain data and precise soil volume calculations. Drone surveying technology provides accurate topography in a short time and economic advantages. In this paper, a drone surveying technique was used to derive a high precision soil volume calculation system. Field demonstration were performed to verify the accuracy of the volume measurement system. The results of earth-work calculation using drone survey were compared with those of GPS surveying. In addition, the developed earth-work volume calculation algorithm is compared with the existing aerial survey software (Pix4D) to verify the accuracy.

Some Considerations of the Evaluation and Its Analysis on tile Profitability of the Investment Project. -On the Calculation and Analysis of IRR in Casting Facilities- (투자사업의 수익성 평가 및 분석에 관한 소고 -주물시설에 대한 IRR를 중심으로-)

  • 이상억
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.2 no.2
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    • pp.53-62
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    • 1979
  • A widely accepted indicator of a project's economic potential is the internal rate of return (IRR). The primary objective of feasibility analysis for any project is to measure the economic potential for the project, normally defined as the expected return on capital investment. The analysis should be designed to determine whether a project is technically and economically sound, and under what conditions. Therefore, there are factors other than economic potential that must be taken into account in the reasonable composition of an investment program. These kinds of factors can be given proper consideration in project selection after the economic feasibility of alternative projects has been determined. The primary reason for having to choose among different projects is that capital resources are scare : the investment budget is limited. The case project, casting facilities investment project, treated in this paper were selected for their value in illustrating the methods of feasibility analysis. This case project an actual potential project and is analyzed on the basis of the best available data for the specific conditions for that project.

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A Study on the Methodology for Economic and Environmental Friendliness Analysis of Back-End Nuclear Fuel Cycles

  • Song, Jong-Soon;Chang, Soo-Young;Ko, Won-Il;Oh, Won-Zin
    • Journal of Radiation Protection and Research
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    • v.28 no.4
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    • pp.361-368
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    • 2003
  • The economic and environmental friendliness analysis of the nuclear fuel cycle options that can be expected in Korea were performed. Options considered are direct disposal, reprocessing and DUPIC (Direct Use of Spent PWR Fuel In CANDU Reactors). By considering the result of calculation of the annual uranium requirement and nuclear spent fuel generation by analysis of nuclear fuel material flows in the nuclear fuel cycle options, we decided the time of back-end nuclear fuel cycle processes and the volume. Then we can analyze the economic and environmental friendliness by applying the unit cost and unit value of each process, respectively.

Software Development on Power and Economic Analysis of Photovoltaic System for Building Application (건물용 태양광발전 시스템 성능 및 경제성 평가 프로그램 개발 연구)

  • Yoon, Jong-Ho;Shin, U-Cheul;Park, Jae-Wan
    • Journal of the Korean Solar Energy Society
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    • v.28 no.1
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    • pp.1-8
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    • 2008
  • The aim of this study is to develop the photovoltaic simulation program, called SimPV, which can Predict hourly based power generation of various PV modules and conduct an intensive economic analysis with Korean situation. To establish the reliability of the PV simulation results, we adopt the PV calculation algorithm of TRNSYS program of which verification has already well approved. Extensive database for hourly weather data of Korean 16 cities, engineering data for PV system and building load profiles are established. Case study on the 2.5kW roof integrated PV system and economic analysis are presented with the developed program.

Estimation of Optimum Capacity for Rainwater Storage Facilities based on Mass Balance and Economic Analysis (Mass-balance 및 경제성 분석에 의한 빗물저류시설 적정 규모 산정)

  • Kim, Youngmin;Lee, Sangho;Lee, Jung-Hun;Kim, Ree-Ho
    • Journal of Korean Society of Water and Wastewater
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    • v.22 no.2
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    • pp.233-238
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    • 2008
  • Recently, rainwater harvesting facilities have increasingly constructed mainly in elementary schools and government buildings. Nevertheless, few methods are available for efficient planning and design of rainwater harvesting facilities by considering the weather conditions and purpose of rainwater management in each site, which may lead to a construction of uneconomic facilities. The current method estimates the size of rainwater storage tank by multiplying the size of building or plottage with a certain ratio and has many limitations. In this study, we first developed a method for planning and design of rainwater storage facilities using $Rainstock^{TM}$ model, which is based on mass balance, and economic analysis. Then, the model was applied for the design of a rainwater harvesting facility in a building with the catchment area of $1,000m^2$. The model calculation indicated that the economic feasibility of rainwater harvesting depends on not only the size of storage tank but also the water usage rate. When the water usage rate is $1m^3/day$, the rainwater harvesting facility is not cost-effective regardless of the size of the storage tank. With increasing the water usage rate, the economical efficiency of the facility was improved for a specific size of the storage tank. Based on the model calculation, the optimum tank sizes for $5m^3/day$ and $10m^3/day$ of water usage rates were $24m^3$ and $57m^3$, respectively. It is expected that the model is useful for optimization of rainwater storage facilities in planning and designing steps.

An Analysis of Economic Effect for Women-farmer's Center (여성농업인센터 운영사업의 사회적 편익 추정)

  • 최윤지;김경미;강경하;이진영
    • The Korean Journal of Community Living Science
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    • v.15 no.3
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    • pp.29-43
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    • 2004
  • The purpose of this study was to calculate the economic effect of Women-Farmer's Center. Since 2001, The Ministry of Agriculture and Forestry has run Women-Farmer's Centers in which women-farmers can receive the care for their pre-schooling children, after-school learning service, and city-farm exchange, education, and counseling. In other words, Women Farmer's Center provides not only improvement of ease and quality of life of women-farmer's, but also spreading economic effect to community and country. By calculation based on business plan of 14 centers that run centers, total economic income effects are 2,784 million won, which consist of 1,265 million won for counseling, 146 million won for the care of infants and children, 139 million won after-school learning, 1,020 million won for education, and 214 million won for city-farm exchange program. The Women-Farmer's Center should be managed reasonably with government support so that Women-Farmer's Center will become as a base camp for young women farmers to participate in agriculture and rural community and increase its economic effect for the nation in the future.

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Essay on the Calculation of Appropriate Working Environment Measurement Fees (적정 작업환경측정수수료 산정을 위한 소고)

  • Park, Ji-Yeon
    • Journal of Korean Society of Occupational and Environmental Hygiene
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    • v.31 no.3
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    • pp.274-285
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    • 2021
  • Objectives: The question of whether the level of fees paid to working environment measurement agencies is appropriate has long been a matter of concern to the government. In addition, measurement institutions express dissatisfaction with their level of compensation, which has a great influence on the evaluation of a subject's policy. This study is intended to find a way to appropriately calculate working environment measurement fees. Methods: We looked at the principle of fee determination as a basic theory of fee calculation used in fee calculation, the legal and academic aspects of the general method of fee calculation, and government cost calculation standards. Furthermore, we reviewed the research methods applied so far to derive a method of calculating fees appropriate for this environment. Results: The working environment measurement environment is different from other commission calculation environments. The other environment is to appropriately calculate the service price provided by a monopoly public enterprise, while the situation is to appropriately calculate the fees provided by competitive private enterprises. Therefore, the service delivery environment and the delivery entity are different. In this case, the appropriate method of calculating service fees would be competitive pricing. There have also been many problems under the method of calculation by service cost. Conclusions: First, the working environment measurement fee requires an accounting correction of endogenous variables. Second, the theory of calculating fees appropriate for this situation is appropriate for competitive pricing that applies to private competitors. Third, the government should make efforts to make the service supply market a fully competitive market while ensuring that the service fee level is determined at the marginal cost level. Fourth, economically, research on marginal cost levels is needed.

Characteristics of Immobilized PVA Beads in Nitrate Removal

  • Cho Kyoung-Sook;Park Kyoung-Joo;Jeong Hyun-Do;Nam Soo-Wan;Lee Sang-Joon;Park Tae-Joo;Kim Joong-Kyun
    • Journal of Microbiology and Biotechnology
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    • v.16 no.3
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    • pp.414-422
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    • 2006
  • Before applying PVA bio-beads to practical biological treatment of nitrate-containing wastewater, their characteristics were examined. PVA bio-beads could steadily produce nitrogen gas from nitrate for 28 batches with 0.04 ml/l/h of the maximum gas production rate; however, the maximum gas production rate dropped remarkably thereafter with apparent deformation of beads. Addition of 2.2% solution containing 1% casamino acid, 1% yeast extract, 0.1% mineral solution, and 0.1% vitamin solution to the culture medium resulted in not only recovery of activity of deactivated beads, but also a higher rate of gas production. Calculation of economic benefit for the use of bio-beads in a long-run operation indicated that reactivation of bio-beads by chemicals had economical advantages over packing new bio-beads in the system. The continuously stirred bioreactor exhibited a satisfactory performance at HRT of 20.0 h. With a 9.5 mg $NO_{3}^{-}N/l/h$ nitrate removal rate, nitrate could completely be removed without nitrite accumulation. The use of PVA bio-beads in nitrate removal appears very promising.

Hydrothermal Solution-Rhyolite Reaction and Origin of Sericitite in the Yukwang Mine (유문암-열수 반응과 유광 견운모 광상의 성인)

  • Park, Maeng-Eon;Choi, In-Sik;Kim, Jin-Sup
    • Economic and Environmental Geology
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    • v.25 no.3
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    • pp.225-232
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    • 1992
  • The hydrothermal alteration is evaluated using multicomponent equilibrium calculations with the program CHILLER for the reactions between hydrothermal water and rhyolite at the temperature of $300^{\circ}C$ and pressure of 500 bars. The chemical-reaction model on the depositional processes of the sericitite confirms that the hydrothermal water-rock interaction(hydrothermal alteration) is the main mechanism of the sericitite formation. The principal change in the aqueous phase during the reaction is the pH increase. Overall trends for the major species are the increase in total molalities of K, Ca, $SiO_2$, Al, Mg, Fe, Na, and sulfide in solid phase with hydrothermal water-rhyolite reaction and the decrease of them in aqeous solution by precipitation of hydrothermal products. Quartz and sericite are the first minerals to form. The sequence of minerals to precipitate following them is chlorite, epidote, pyrite and microcline as water/rock ratio decreases. Although calculated results cannot duplicate the complexities of natural hydrothermal alteration, the calculation provides thermodynamic constraints on the natural process. The calculation results resemble those of experimental studies. Sericitite forms where pH decreases and water/rock ratio increases.

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