• Title/Summary/Keyword: Economic validity

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친환경 교통수단으로서 KTX의 역할과 기대

  • Bang Yeon-Geun
    • Journal of the Korean Society for Railway
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    • v.9 no.2 s.31
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    • pp.19-24
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    • 2006
  • Green gas emissions Trading System(ETS) came into effect in the Europe last year 2005. All transport modes have tried to reduce green gas emission and EU member countries are promoting the use of environmental friendly transport mode to avoid economic loss due to green gas emission. Besides ETS, rapidly rising of oil price and peak oil urge to invest more in the environmental friendly public transport mode and to discourage the use of private cars. The operation of KTX is estimated to bring external cost reduction up to 570 bil. won in 2004 based on European external unit costs of transport modes. This result implies that the expansion of high speed rail network and reconsideration of East-West high speed rail network which is not considered because of weak economic validity is required.

A Study on Investment Evaluation of Transportation Facilities (교통시설물 투자평가에 관한 연구 -충주시를 중심으로-)

  • 김용범;김용래
    • Journal of the Korea Safety Management & Science
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    • v.5 no.1
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    • pp.13-31
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    • 2003
  • This provided a basic frame to analyze the investment effect on the road, railroad, airport and port as a national dimension but it still has a limitation to analyze the specific economic and financial validities to consider the characteristics of the traffic facilities within the area. Conclusively, the aims of this study provide the reasonable evaluation guidelines effectively to the local automatic groups, especially Chungju in the frame of the present evaluation guidelines. We provide the adaptive alternatives on the present systems which are difficult to adapt to the present investment evaluation guidelines; the estimation method of the social economic index and the estimation method of the traffic demand. Additionally, we discuss the research method of the passage actual state for a reasonable estimation of the traffic demand. The result of this study will be activated for the validity check and construction plan of the reasonable traffic investment plan of Chungju city.

Analysis of Economic Replenishment Policy for Exponentially Deteriorating Products under Trade Credit Depending on the Amount of Purchase (구매량에 종속적인 외상기간을 고려한 퇴화성 제품의 경제적 주문정책)

  • Shinn, Seong-Whan
    • Journal of Korean Institute of Industrial Engineers
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    • v.28 no.3
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    • pp.232-239
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    • 2002
  • This paper analyzes how a buyer can determine the economic replenishment policy when the supplier allows delay in payments for an order of a product. For the analysis, it is assumed that the length of credit period is a function of the buyer's amount of purchase, and inventory is depleted not only by buyer's demand but also by deterioration. Investigation of the properties of the model developed allows us to develop an algorithm whose validity is illustrated using an example problem.

Tool Wear and Fracture Monitoring through the Sound Pressure in Turning Process (음압을 이용한 선삭작업에서의 마모, 파손 감시)

  • 이성일
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 1997.04a
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    • pp.82-87
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    • 1997
  • In order to make unmanned machining systems with satisfactory performances, it is necessary to incorporate appropriate condition monitoring systems in the machining workstation to provide the required intelligence of the expert. This paper deals with condition monitoring for tool wear and fracture during turning operation. Developing economic sensing and identification methods for turning processes, sound pressure measurement and digital signal processing technique are proposed. The validity of the proposed system is confirmed through the large number of cutting tests.

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Condition Monitoring of Tool Wear and Breakage using Sound Pressure in Turning Processes (선삭공정에서 음압을 이용한 공구마멸 파손의 상태감시)

  • 이성일
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.6 no.3
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    • pp.36-43
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    • 1997
  • In order to make unmanned machining systems with satisfactory performances, it is necessary to incorporate appropriate condition monitoring systems in the machining workstations to provide the required intelligence of the expert. This paper deals with condition monitoring for tool wear and breakage during turning operation. Developing economic sensing and identification methods for turning processes, sound pressure measurement and digital signal processing technique are proposed. The validity of the proposed system is confirmed through the large number of cutting tests.

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Structural Model Analysis of the Relationships Between Socio-economic Status of Family, Home Environment Stimulation, Children's Behavioral Problems, and Interactive Peer Play of Preschool Children (유아의 또래놀이 상호작용에 영향을 미치는 사회경제적 지위, 가정환경자극 및 유아의 행동문제 간의 구조적 관계)

  • Kim, Seri;Lee, Kangyi
    • Korean Journal of Childcare and Education
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    • v.12 no.6
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    • pp.41-58
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    • 2016
  • This study investigated the relationships between socio-economic status of family, home environment stimulation, children's behavioral problems, and interactive peer play of preschool children. Surveys of 2,150 Korean mothers with their preschool children(Mean age= 51.9 months) from the Panel Study of Korean Children by Korea Institute of Child Care and Education were analyzed using structural equation modeling. Each variable's confirmatory factor analysis showed the correlation coefficient below .85, which made a satisfactory level of discriminant validity. The model fit to the data well, with an agreeable level of index. The major findings were as follows. First, SES did not significantly affected children's interactive peer play. Second, SES significantly affected home environment stimulation and children's behavioral problems. And the relationship between SES and children's behavioral problems are significantly mediated by home environment stimulation. Third, the relationship between SES and children's interactive peer play are significantly mediated by home environment stimulation and children's behavioral problems. These results help better understand the paths among the home characteristics and children's behavioral problems on children's social development. Interpretation and implication of the results have been discussed.

Economic Life Assessment of Power Transformer using HS Optimization Algorithm (HS 최적화 알고리즘을 이용한 전력용 변압기의 경제적 수명평가)

  • Lee, Tae-bong;Shon, Jin-geun
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.66 no.3
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    • pp.123-128
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    • 2017
  • Electric utilities has been considered the necessity to introduce AM(asset management) of electric power facilities in order to reduce maintenance cost of existing facilities and to maximize profit. In order to make decisions in terms of repairs and replacements for power transformers, not only measuring by counting parts and labor costs, but comprehensive comparison including reliability and cost is needed. Therefore, this study is modeling input cost for power transformer during its entire life and also the life cycle cost (LCC) technique is applied. In particular, this paper presents an application of heuristic harmony search(HS) optimization algorithm to the convergence and the validity of economic life assessment of power transformer from LCC technique. This recently developed HS algorithm is conceptualized using the musical process of searching for a perfect state of harmony. It uses a stochastic random search instead of a gradient search so that derivative information is unnecessary. The effectiveness of the proposed identification method has been demonstrated through an economic life assessment simulation of power transformer using HS optimization algorithm.

A Study on Economic Measurement Model of R&D Project Performance (R&D 프로젝트 성과의 경제적 가치 측정 모델 연구)

  • Kim, Young-Myoung;Sung, Hankyu
    • Journal of Technology Innovation
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    • v.21 no.1
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    • pp.229-252
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    • 2013
  • The aim for this study is to suggest a practical model to measure the financial values of the achievements from corporate research and development(R&D) projects. Performance indicators for R&D projects were identified from the extensive literature reviews and the evaluation methods to convert them into financial values were proposed to overcome the problems of excessive predictions and subjective expert assessments in existing methods. The proposed model was applied to R&D projects of an IT company in Korea for its validity test. The model is expected to be a turning point in economic evaluation of corporate R&D projects in general due to its practical and reasonable scheme.

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An Exploratory Study on the Economic Value of IPv6 Technology (IPv6 도입의 경제적 가치 산정에 대한 탐색적 연구)

  • Lee, Byung-Heon;Lee, Sang-Kon
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.31 no.1B
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    • pp.56-70
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    • 2006
  • This study attempts to estimate the size of economic value that could be created by the adoption of a new internet protocol, IPv6. The existence of externality and diffusion effects in the adoption of a new platform technology makes it difficult to capture the exact costs and benefits of IPv6 adoption. Hence, this study employed multiple evaluation methods rather than relying on single method to increase the validity of results by averaging the value of different methods. Futhermore, the proposed evaluation model includes qualitative variables such as expert opinions, as well as quantitative variables, to incorporate various stakeholders' perspectives. Finally, the policy implications for IPv6 adoption and the limitations of this study are discussed.

A Comparative Analysis of the Functional Values for Wastewater Treatment and Atmospheric Regulation in Coastal Wetland and Rice Paddy Ecosystems (갯벌과 간척농지의 수질 및 대기조절가치의 비교분석)

  • Pyo, Hee-Dong
    • Environmental and Resource Economics Review
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    • v.10 no.1
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    • pp.95-126
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    • 2001
  • Functional values for wastewater treatment and atmospheric regulation in coastal wetland and rice paddy ecosystems are quantified, and an illustration is given on how to integrate biophysical parameters into a valuation framework. This is one of most controversial issues in economic analysis for wetland preservation versus wetland conversion to agricultural use. This paper includes theoretical considerations for estimating functional values of environmental ecosystems, and the integration of biophysical data and replacement cost method employed. Specific physical and geographical characteristics and data on ecosystem functions and services in coastal wetlands and rice paddies are addressed for evaluating their values in economic terms. In particular this paper indicates double counting problems and overestimation in the previous studies, and demonstrates how to avoid them and to maintain the consistency of valuation process involving a least-cost method, thus enables an accurate integration of the coastal wetland ecology and wetland economics. As a result which is far away from the previous studies, the total economic present value of wastewater assimilation by coastal wetland is estimated at 7,484,640 won/ha, and the net present value of positive effect for atmospheric regulation, negative effects for air pollution and water pollution by rice paddy is estimated at -37,934 won/ha, assuming that resources are infinitely long-lived and the annual value and the rate of discount (10%) is constant every year. In conclusion, for further reliability and validity of functional values for natural resources it is very noteworthy that a general equilibrium framework that could directly incorporate the interdependence between ecosystem functions and services would be preferred to the partial equilibrium framework.

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