• 수산경영론집
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• 제24권2호
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• pp.69-82
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• 1993

The purpose of this paper is to estimate production function in the coastal fishing, especially long bag set net fishing and trap fishing using Cobb-Douglas production function with the three main variables: fishing quantity per tonage(WQFP), the number of working persons per tonage(WEMP), and the number of utilized fishing equipments per tonage(WEQU). The statistical results of such estimation reveal that fishing quantity per tonage can be expressed as a function of the number of working persons per tonage and the number of utilized fishing equipments per tonage. The estimated coefficients of WEMP and WEQU are statistically significant and also satisfy the requirements of Cobb-Douglas production function. This study also estimates marginal rate of technical substitution of labor in terms of capital (MRT $S_{LK}$ )in each long bag set net fishing and trap fishing. The resuits of this study show us that trap fishing has the technical characteristic of constant returns to scale(CRS) but long bag net fishing has that of decreassing returns to scale(DRS).

• 토지주택연구
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• 제2권2호
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• pp.145-155
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• 2011

It is very important for successful construction to estimate the soil volume conversion factor of domestic weathered ground accurately and reasonably. However, it is very difficult to quantify the weathering degree of weathered ground at the field, so that the soil volume conversion factor used in Korea is often dependent upon the standard of foreign countries. Besides, the soil volume conversion factor of domestic weathered ground has been rarely studied and the use and accuracy of the soil volume conversion factor have been questioned persistingly. This study suggests a simple but robust method for estimating the soil volume conversion factor and measuring the weathering degree reasonably, and attempts to establish the utilization of a soil volume conversion factor measurement system based on experimental and analytical results. We made relationship between electrical resistivity and weathering degree presented from weathering index obtained through laboratory tests using field samples, and an estimation method of in-situ weathering degree for granites and a calculation method of soil volume conversion factor using electrical resistivity. And also, we suggested the photogrametry measurement-equipment system for measuring the volume of cargo box and the application plan of stand equipment and RFID for calculating the earth volume and distinguishing buggies in order to design the measurement system for soil volume conversion factor applicable to the field. Ultimately, the Weathered Earth-work Management Program (WEMP) was developed, so field managers may easily obtain the information about earth volume and soil volume conversion factor at the weathered ground.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2011년도 정기 학술대회
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• pp.170-173
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• 2011

국내 풍화지반의 토량환산계수를 정확하고 합리적으로 추정하는 것은 공사의 성패에 있어 매우 중요한 사항이다. 하지만 현업에서는 풍화지반의 풍화도를 정량화하는 것이 어렵고, 토량환산계수를 적용 시 외국의 기준을 사용하는 경우가 빈번하다. 뿐만 아니라, 국내 풍화지반의 토량환산계수에 관한 연구는 아직 미비하여, 끊임없이 토량환산계수의 정확성 및 사용성에 대해 문제 제기가 있어 왔다. 이에 본 연구에서는 TEPS (Tunnel Electrical resistivity Prospecting System)를 이용하여 화강암의 풍화 정도와 전기비저항의 상관관계를 도출하고 풍화지반 내 흙이 차지하는 비율(S/W 비)을 전기비저항과 개괄적으로 상관관계를 맺어 전기비저항을 이용하여 토량환산계수를 산정하는 방법을 제안하였다. 현장 관리자가 풍화지반에서 쉽게 토량환산계수 및 토공량에 관한 정보를 획득할 수 있도록 풍화지반 토공관리프로그램(WEMP)을 개발하고 토량환산계수 측정시스템을 설계하였다.

• 수산경영론집
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• 제25권2호
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• pp.47-58
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• 1994

This paper tries to estimate cost and profit functions under Cobb - Douglas production technology in the coastal fishing, using duality theory of production technology and cost function. Therefore this paper estimates in advance the production functions with two input variables, the number of working persons per tonage(WEMP) and the number of fishing equipment per tonage(WEQU). Then this paper estimates profit function and implicit cost function using the estimated coefficients from production functions. The results of this study show that the annual average profit pertonage of long bag set fishing and trap fishing amount to 4.1 million won and 3.9 million won respectively.