• Title/Summary/Keyword: resource estimation

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Socioeconomic Analysis of Public Forestry Investment(I) - On the Estimation of Social Discount Rate - (공공임업투자(公共林業投資)에 대한 사회경제적(社會經濟的) 분석(分析)(I) - 사회적(社會的) 할인율(割引率)의 추정에 대하여 -)

  • Chang, Cheol Su
    • Journal of Korean Society of Forest Science
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    • v.81 no.3
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    • pp.280-286
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    • 1992
  • When the social cost-benefit analysis is applied for analyzing the public forestry investment, the choice of discount rate to be used in analysis is critical. In this paper, the social discount rate discussed in the public economics was introduced and the social time preference rate as a measure of that was estimated for Korea. The component parameters of the model used are : the elasticity of social marginal utility of consumption and the growth rate of real consumption. The results for the social time preference rate and the elasticity of social marginal utility of consumption are 6.2% and -1.38, respectively, which are plausible and thus can be used as a useful basis in establishing rational resource allocation policies.

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Valuing Estimation of forest healing function of Jangseong Healing Forest (장성 치유의숲의 산림치유기능에 대한 가치평가)

  • Kim, Jin-Seon;Kim, Eui-Gyeong;Kim, Dong-Hyun;Shin, Hye-Jin
    • Journal of Korean Society of Forest Science
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    • v.103 no.3
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    • pp.453-461
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    • 2014
  • As interest in 'Forest therapy' continues to increase, local governments as well as Korea Forest Service (KFS) are actively promoting a project to create 'healing forests' nationwide. In this situation, it is necessary to examine whether such a policy is suitable. Therefore, the main purpose of this study is to estimate the use value of Jangseong healing forest which is the most-visited place among the national healing forests. To achieve this aim, a survey of randomly selected 400 visitors was conducted in Jangseong healing forest. 391 surveys were used for analysis, excluding 9 untruthful answers. And 1.5 bounded dichotomous choice contingent valuation method (CVM) was used to estimate the economic value of Jangseong healing forest. As a result, the average willingness to pay ($wTP_{mean}$) for the use fee of Jangseong healing forest was 35,010 won per visitor per day. And the annual use value of Jangseong healing forest was estimated to be worth almost 7.5 billion won.

A thermodynamic analysis on the utilization of thermal water (온수 이용에 관한 열역학적 해석)

  • 이세균
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.11 no.1
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    • pp.97-104
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    • 1987
  • An analysis on the thermodynamic optimum use of thermal water has been accomplished. The systems investigated are power generation and space heating. The space heating systems considered in this study are direct heating, heat pumps and heat pump assisted heating. The object of this study is to find the optimum selection and operation of the system under the given resources. The measure of such optimum conditions is the EFFECTIVENESS, the concept of efficiency based upon the Second Law of Thermodynamics. The temperature of water to waste is identified as the most important parameter to be optimized. The analysis indicates that for high temperature resources (higher than about 425K) power generation yields the best performance and is therefore recommended. The heat pumps are recommended for the resource temperature less than about 327K. The heat pump assisted heating system shows its superiority for the very narrow temperature range (320K-330K) and thus the use of this system should be considered when the flow rate is very limited. thus the direct heating is appropriate for the temperature range of 330K-425K. The analysis also shows the optimum capacity of thermal water, which may be useful for the initial estimation of heating or power generation potentials of given resources.

Estimation of Welfare Change from Water Quality Degradation (수질 악화로 인한 후생변화의 추정)

  • Jeon, Chul-Hyun;Lee, Chung-Sun;Shin, Hio-Jung
    • Journal of Environmental Policy
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    • v.9 no.2
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    • pp.135-155
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    • 2010
  • The purposes of the paper are to estimate welfare change from water quality degradation by using contingent valuation method in Namdae stream of Gangrung and identify what factors of Namdae stream are important to Gangrun citizens. The study results show their total WTP per year and per household, \117,040 to improve Namdae stream quality from grade 3 to grade 1, including monetary WTP \87,502 plus opportunity cost of volunteering time for protection campaign, \29,538. The amount of total welfare change from water quality degradation based on the total WTP estimated above is calculated to be \27 billion of which the amount, as a sort of damage cost from water quality degraded, is so huge. All projects and policies related to natural environments, therefore, should consider both indirect and direct effects from them because natural environments have the irreversibility once degraded or deteriorated and would ultimately be influential on humans, both current and future generations, with tremendous amounts of time and costs beyond our imagination.

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Design of Radio Interface Protocols for Broadband CDMA Wireless Local Loop and Access Channel Performance Analysis (광대역 CDMA WLL 무선 프로토콜 설계 및 액세스채널의 성능분석)

  • 김영태;박기식;조정호;김광현;이태훈
    • Journal of Korea Multimedia Society
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    • v.2 no.1
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    • pp.47-58
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    • 1999
  • In this paper, we design the radio interface protocols of wideband Wireless Local Loop(WLL) that uses wideband Code Division Multiple Access(CDMA), and propose the random access procedures on access channel and analyze the performance of the channel. The structure of radio interface protocols are designed by three modular parts to meet the requirements of IMT-2000 : radio resource controlling part that depends on the radio resources, connection controlling part that is independent of the radio resources, and application part that supports the interface between different parts and user terminals. In addition, we propose the random access procedures on access channel and analyze the performance of the channel. We assume that both near-far effect and shadow fading can be compensated by open loop power control. We observe that the number of access probes(delay) depend on the initial mobile transmission power and power increment, and the poor estimation of initial mobile transmission power might increase the average number of access probes.

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Households' Financial Status Estimation with Financial Ratios (재무비율을 이용한 소득계층별 가계재무구조분석)

  • Huh, Kyung-Ok;Han, Su-Jin
    • Korean Journal of Human Ecology
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    • v.14 no.4
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    • pp.613-629
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    • 2005
  • This research analyzes household financial structures and ratios to understand factors of household utility. Its main themes are as following: First, what kinds financial structures are found at each level of income? Second, how are they different by the level of income? Third, what factors contribute to appropriate financial ratios? The themes are supported by the texts on financial ratios from both inside and outside of Korea and proved by the Korean Labor and Income Panel Survey, the fifth annual edition. The households are exempted that do not support the household principle record in the principle and household economy record. Accordingly, this survey is from a financial structure analysis of 3,762 households. The analysis utilizes SPSS Window (Version 10.0) program. The following are the results: First, the income level 4 and above, in which the increasing number indicates a higher level of income, are highly ranked on the income-expense level and the asset-debt rate. Also, level 4 has a strong financial structure, whereas level 1 does not. Apparently, the management of the household is complicated by debt redemption and a lower level of assets. Second, Ratio 1, Ratio 2, Ratio 4, and Ratio 5 are different by the level of income. Third, the level of income contributes to the appropriate financial ratio. The financial safety and prospective financial structure at each income level is an important variable. Households with a high income, in particular, have to balance their finances and capital, reducing liabilities and increasing the total assets. In other words, the family must hold assets to enhance efficiency according to the character and income level of the household. This research is a useful resource for such a decision-making as to improve household financial structure stability. Also, it can be adopted to evaluate financial products for specific households and be used for economic and social welfare planning to predict how households influence the nationwide economy.

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A Function Level Static Offloading Scheme for Saving Energy of Mobile Devices in Mobile Cloud Computing (모바일 클라우드 컴퓨팅에서 모바일 기기의 에너지 절약을 위한 함수 수준 정적 오프로딩 기법)

  • Min, Hong;Jung, Jinman;Heo, Junyoung
    • Journal of KIISE
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    • v.42 no.6
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    • pp.707-712
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    • 2015
  • Mobile cloud computing is a technology that uses cloud services to overcome resource constrains of a mobile device, and it applies the computation offloading scheme to transfer a portion of a task which should be executed from a mobile device to the cloud. If the communication cost of the computation offloading is less than the computation cost of a mobile device, the mobile device commits a certain task to the cloud. The previous cost analysis models, which were used for separating functions running on a mobile device and functions transferring to the cloud, only considered the amount of data transfer and response time as the offloading cost. In this paper, we proposed a new task partitioning scheme that considers the frequency of function calls and data synchronization, during the cost estimation of the computation offloading. We also verified the energy efficiency of the proposed scheme by using experimental results.

Construction of "CIDEAR" Model for Selecting and Evaluating Cross Impact R & D Projects (상호영향형 R&D과제군의 평가산정을 위한 "CIDEAR" 모형의 개발)

  • Kwon Cheol Shin;Park Joon Ho;Hong Seok Ki
    • Journal of the Korean Operations Research and Management Science Society
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    • v.29 no.3
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    • pp.41-61
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    • 2004
  • The purpose of this paper is to construct $\ulcorner$CIDEAR(Cross Impact-DEA-AR)$\lrcorner$ model which evaluates proposed R&D projects considering cross impact among them and selects proper projects to utilize resources efficiently as well as to maximize efficacy of investments. For this purpose, $\ulcorner$CIDEAR$\lrcorner$ model is designed as the following six steps. $\ulcorner$Decision Theory Evaluation Model$\lrcorner$ is for setting and selecting the evaluation items according to the structured procedure of evaluation system. The priority of items is decided at $\ulcorner$AR Decision Model$\lrcorner$$\ulcorner$Cross Impact Estimation Model$\lrcorner$ is for computing the final probability of success and the result is used to revise the evaluation results of $\ulcorner$Decision Theory Evaluation Model$\lrcorner$. $\ulcorner$Resource Performance Analysis Model$\lrcorner$ classifies the proposed R&D projects on the basis of required resources and expected performance. Consequently, the possibility of bias of project selection can be prevented. $\ulcorner$Priority Oder Decision Model$\lrcorner$ is for computing the efficacy of proposed projects. Finally, $\ulcorner$Efficacy-Efficiency Cause Analysis Model$\lrcorner$ analyzes the structure of efficacy and efficiency of the projects. The major findings and significances of this study are summarized as follows: (1) $\ulcorner$CIDEAR$\lrcorner$ model can deal with the affairs of R&D projects having the characteristics of mutual independence as well as mutual dependence in the point of efficacy and efficiency. Hence, it is possible to evaluate and select R&D projects more accurately. (2) It can be possible to raise the possibility of projects success. R&D manager can use the information for project management because the efficacy-efficiency structure of selected projects can be analyzed. (3) We proved the usefulness of the constructed $\ulcorner$CIDEAR$\lrcorner$ model using an case about twenty-one R&D projects of a leading company of electronic industry in Korea.

Estimation of Stream Discharge using Antecedent Precipitation Index Models in a Small Mountainous Forested Catchment: Upper Reach of Yongsucheon Stream, Gyeryongsan Mountain (산악 산림 소유역에서 선행강우지수를 이용한 하천유량 추정: 계룡산 용수천 상류)

  • Jung, Youn-Young;Koh, Dong-Chan;Han, Hye-Sung;Kwon, Hong-Il;Lim, Eun-Kyung
    • Journal of Soil and Groundwater Environment
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    • v.21 no.6
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    • pp.36-45
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    • 2016
  • Variability in precipitation due to climate change causes difficulties in securing stable surface water resource, which requires understanding of relation between precipitation and stream discharge. This study simulated stream discharge in a small mountainous forested catchment using antecedent precipitation index (API) models which represent variability of saturation conditions of soil layers depending on rainfall events. During 13 months from May 2015 to May 2016, stream discharge and rainfall were measured at the outlet and in the central part of the watershed, respectively. Several API models with average recession coefficients were applied to predict stream discharge using measured rainfall, which resulted in the best reflection time for API model was 1 day in terms of predictability of stream discharge. This indicates that soil water in riparian zones has fast response to rainfall events and its storage is relatively small. The model can be improved by employing seasonal recession coefficients which can consider seasonal fluctuation of hydrological parameters. These results showed API models can be useful to evaluate variability of streamflow in ungauged small forested watersheds in that stream discharge can be simulated using only rainfall data.

Unit Water Production Cost Development for Alternative Water Resource Projects - Centered on the Economics of Aquifer Storage and Recovery (ASR) - (대안수자원시설의 음용수 단위생산비용 산출 - 청정지하저수지 경제성에 대한 고찰 -)

  • Choi, Jae-Ho;Shim, Young-Gyoo;Park, Nam-Sik
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.37 no.3
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    • pp.611-619
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    • 2017
  • This paper intends to develop unit water production cost (UWPC) between alternative water resources including desalination, freshwater reservoirs, single-purpose dams, underground dams, and two indirect water in-take technologies - riverbank filtration and aquifer storage and recovery (ASR). The UWPCs of water supply schemes including each alternative are determined based on project cost, and operation and maintenance estimation models, which were developed based on real project cost data. The sensitivity analysis of UWPCs reveals that ASR is the lowest cost option in producing drinkable water among the alternatives, followed by riverbank filtration and underground dam. It is expected that economics related to the finding plays a critical role in supporting water resources planning and budget allocation for central and local water authority in Korea.