• Proceedings of the KAIS Fall Conference
• /
• 2002.05a
• /
• pp.90-92
• /
• 2002

원예산물은 그 특성상 장기 보관이 어렵고 가격의 변동이 심한 생산품 중에 하나이다. 또한 생산지에서의 출하단가와 소비지에서의 가격차가 심해 생산자들에게 돌아가야 할 부분들이 유통과정에서 소멸되는 특징을 가지고 있다. 본 논문은 저장창고를 중심으로 한 원예산물의 출하시기 결정을 위한 의사결정지원시스템을 설계하고 시스템 설계시 요구되는 주요요소들을 정의하고 있다. 또한, 저장창고에서의 출하시기 결정을 위한 정보시스템을 구축하여 그 실용성을 보여주고 있다.

• Environmental and Resource Economics Review
• /
• v.23 no.1
• /
• pp.91-132
• /
• 2014

We investigate the effect of ICT capital on the demands for labor and energy in manufacturing and electricity gas water industries of Korea, US, and UK. Assuming ICT capital, non-ICT capital, labor, electricity, fuel, and material as input factors for manufacturing and ICT capital, non-ICT capital, labor and energy material as input factors for electricity gas water industry, we estimate the Morishima elasticities of substitution. Considering the relative price changes of input factors, ICT capital has substituted labor in manufacturing and electricity water gas industries of the three countries. ICT capital has substituted both electricity and fuel in US and UK manufacturing. Although ICT capital has substituted electricity and fuel each other in Korean manufacturing, ICT capital is unlikely to decrease the demands for electricity and fuel when considering their relative price changes. ICT capital has substituted energy material in electricity gas water industries of the three countries.

• Environmental and Resource Economics Review
• /
• v.24 no.4
• /
• pp.727-745
• /
• 2015

This paper analyzes the firms' optimization behavior in response to rising demand for non-priced renewable energy in the manufacturing industries by using an input distance function. The annual estimates of the shadow price of renewable energy is derived and the trend of its shadow price over time is analyzed. The degree of substitution of renewable energy for fossil-fuels is examined. The input-based Malmquist productivity index, defined as a composite of the technical efficiency and technical change measures, is measured. The contribution of renewable energy input growth to the Malmquist index is analyzed. Empirical results indicate that the shadow price of renewable energy declined at an average annual rate of 17% over the period 1992-2012. Substitutability between renewable energy and fossil-fuels was limited. On average, a 1% increase in renewable energy would decrease Malmquist index by 0.04% per year.

• Journal of Ginseng Research
• /
• v.33 no.3
• /
• pp.240-243
• /
• 2009

To better understand how to increase a ginseng grower's revenue, a 4-factor revenue determination model (RDM) of raw ginseng production (R=A Y Q P) was proposed. The total revenue (R) is a multiplicative function of four factors: cultivation area(A), unit yield (Y), quality grade (Q) and unit price (P). The A appears to be a pure capital factor. Y and Q are technological factors and P is social and market factor. When P is constant, the technological term (YQ) is the revenue per unit area (R/A) production efficiency per capital. The RDM appears to be a linear model between R and A with the slope [YQ]. RDM was applied to three farmers' raw ginseng production for assessment of its dependency on capital and technological factors.

• Journal of Environmental Policy
• /
• v.8 no.3
• /
• pp.115-138
• /
• 2009

The purpose of this paper is to clarify the main components of economic growth and the effects of environmental factorson productivity by comparing traditional productivity growth and environmentally-adjusted productivity growth in 28 Chinese regions based on growth accounting analysis. To do this, we measured the shadow prices of SOx for the 28 Chinese regions. This study found that the annualized growth rate of output in the 28 Chinese regions was almost 10.07% for 1999-2005, though the growth rate was higher in the eastern region than in the middle and western regions. The average traditional productivity was 3.58%, again with the eastern region showing the highest level. The average environmentally-adjusted productivity of the three regions was about 3.56%, which is similar to the level of traditional productivity. This implies that activities regarding pollution reductions in the 28 Chinese regions have not been practiced, even though environmental regulations have been strengthened. Therefore, the regional and central governments should strengthen environmental regulations and strictly enforce them.

• Proceedings of the Korea Society for Energy Engineering kosee Conference
• /
• 2003.05a
• /
• pp.265-288
• /
• 2003

PEMFC의 스택은 MEA와 분리판 및 스택 기술의 결합으로 제조, MEA분야는 현재의 기술로 상용화가 충분하며 가격저감을 위해서는 생산기술과 시장확대가 필요함, MEA의 성능, 내구성 향상에 필요한 혁신적이 기술의 핵심을 이온전도막 임, 분리판은 스택기술과 소재기술의 결합으로, 요소기술적인 문제보다는 사업자의 출현으로 생산기술을 확보하는 것이 필수적임(중략)

• Journal of Korean Society of Forest Science
• /
• v.95 no.3
• /
• pp.268-273
• /
• 2006

This study analyzed the technological change of Korean sawmill industry affected by change of factor price. An aggregate cost function has been estimated to analyze the technological change in Korean sawmill industry between 1970 and 2003 to the technical bias and scale effect. There was substitution among labour, capital, and material, especially in more elastic relation between labour and capital. In addition, domestic sawmill industry was progressed into structure which is biased to labour saving, and capital and material using because of increase of labour price. Since Korean sawmill industry's technology still exhibits an increasing returns to the scale, the large amount of investment has contributed to productivity growth, and the future productivity growth continually depend on the scale effect for some time.

• Proceedings of the KIEE Conference
• /
• 2011.07a
• /
• pp.630-631
• /
• 2011

현재 우리나라 전력시장에서 시장가격(SMP) 결정시에는 전력계통 운영 및 발전기 자기제약에 기인한 Must Run 등의 제약요소들을 고려하지 않고 실제 전력계통 운영시에만 반영하고 있다. 그러나 전력을 안정적으로 공급하기 위해서는 다양한 제약조건을 충족시켜야 하므로 시장가격은 원칙적으로 이러한 기술적인 제약을 충족시키는 조건에서 결정되어야 한다. 따라서 각종 제약요소 처리 관련 효율적인 전력의 생산 및 소비, 신규투자 등에 대한 시장신호를 제공하기 위해 필요한 개선방향 검토, 시장에 미치는 영향을 분석하고 가능한 개선대안을 모색하여 보았다. 현실적으로 가능한 전력계통 예비력 확보 조건, 발전기 자기제약의 반영 등은 단기적으로 시행하되, 계통제약을 반영한 지역별가격제는 송전이용요금의 개선과 병행하여 점진적으로 개선하는 것이 바람직할 것이다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2015.10a
• /
• pp.619-622
• /
• 2015

Recently, there are growing fluctuations of productivity and price caused by severe weather conditions in the agriculture. Yield forecasting methods have been studied to solve the problems. This paper predicted yield per area, production area, and elements of weather based on the linear equation. A yield is calculated by multiplying the production area times the yield per area that is compensated using the weighted sum of the elements of weather. In experiments, proposed method shows that a forecasting precision is the more than 90%.

• Environmental and Resource Economics Review
• /
• v.13 no.1
• /
• pp.33-47
• /
• 2004

Even though the price of extracted but unprocessed coal has been available in Korea, the use of it as scarcity index would be inappropriate because of price subsidy. Following Halvorsen and Smith(1984), Kim and Lee(2002) derived estimates of the shadow price of unextracted coal by estimating the restricted cost function and differentiating with respect to the quantity of coal extracted. In Korea, however, due to the limited data the capital prices have been computed inconsistently case by case without relying on the robust formula like the Christensen-Jorgenson methodology used in US, which could result in biased estimators of the restricted cost function. In the paper the shadow prices of the resources in situ are obtained by measuring an input distance function defined by Shephard (1970), which requires only the data on the quantities of inputs and output. Empirical results for the Korean coal mining industry show that these shadow prices as a coal scarcity have increased fast by approximately three times in comparisons with those obtained by Kim and Lee.