• 자원ㆍ환경경제연구
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• 제15권4호
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• pp.713-740
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• 2006

본 논문에서는 석회석광산 개발사업의 사례를 통해 자원개발사업의 비용-편익분석시 고려되어야 할 비용 및 편익 항목이 무엇이며 이의 정확한 계산을 위해서는 어떤 점을 주의해야 하는지 등을 살펴보았다. 본 논문의 결과에 따르면 임산불 생산가치, 수원함양가능, 대기정화 가능 등은 산림훼손에 따른 환경비용으로 간주되어야 하나 통상적으로 환경비용무로 간주되어 왔던 산림휴양 기능, 산림정수 기능 등은 개별 단위의 석회석 개발 사업시는 환경비용으로 간주하기는 어려운 것으로 나타났다. 비용-편익분석 결과는 할인율에 따라 달랐으나 모두 순편익이 있는 것으로 나타났다. 순편익의 규모는 6,899 억 원에서 1조 784억 원인 것으로 나타났다.

• 인지과학
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• 제8권4호
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• pp.55-62
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• 1997

본 논문은 매개변수 템플리트로 알려진 가변 형판(deformable template)을 사용하여 얼굴의 주요 구성 요소인 입 영역을 분할하는 방법을 제안한다. 가변 형판의 에너지 함수는 이미지 명암값(intensity), 연결(links), 에지(edges), 피크(peaks), 밸리(valleys) 등의 식으로 정의된다. 이 템플리트는 에너지 함수를 최소화하도록 매개변수들의 값을 변경함으로써 자신을 최적화하면서 변형된다. 이 최적화된 템플리트의 매개변수들의 값은 특징으로 사용된다. 우리는 이 가변 형판의 매개변수들의 초기값과 범위를 전처리를 통하여 구하여 시행시간을 줄이고 정확한 입 영역을 분할하는 방법을 제안한다.

• 한국임상수의학회지
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• 제7권1호
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• pp.381-390
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• 1990

In order to study the effects of administration of carbon tetrachloride(CCI$_4$) and 1-naphthylisothiocyanate(ANIT) on the liver of Korean black goats, some liver function tests and liver biopsy were done on 4 Korean black goats dosed with CCI$_4$(0.4m1/kg of body weight) in-traruminally and 4 Korean black goats dosed with ANIT(400mg/kg of body weight) by stomach tube. BSP Tl/2 and serum total bilirubin concentration in goats dosed with CCI$_4$ were increased gradually, reached to maximum value on 2nd and 1st day, respectively, and then began to decrease in normal range, gradually. In goats dosed with ANIT, BSP Tl/2 and serum total bilirubin concentration were increased rapidly, reached to maximum value on 0.5 and 1st day, respectively, and then returned to normal ragne, rapidly. Serum SDH, AST and GGT activities in goats dosed with CCI$_4$ were increased rapidly and reached to maximum value on 3rd, 1st and 2nd day, respectively. Thereafter, the serum enzyme activities began to decrease in normal range gradually. In goats dosed with ANIT, however, serum SDH, AST and GGT activities were not changed. The histopathologic changes in goats dosed with CCI$_4$ were lipidosis and centrilobular nee-rosis of the hepatic parenchyma. In goats dosed with ANIT, hyperplasia of bile duct epithelium was noticeable, but pathologic changes in liver parenchyma were not noticed. Conclusively, in Korean black goats dosed with CCI$_4$, main finding was necrosis of hepatic parenchyma. In Korean black goats dosed with ANIT, main finding was cholestasis.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2006년도 정기학술발표대회 논문집
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• pp.483-486
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• 2006

건설 프로젝트에서 VE는 예산절감 및 품질을 향상시킬 수 있는 체계적인 방법이며 최근 건설VE 업무의 적용범위가 확대됨에 따라 그 중요성이 부각되고 있다. 따라서 VE 업무를 체계적이고 효율적으로 수행할 수 있는 방법에 관한 연구가 요구된다. 이에 본 연구에서는 현행 건설VE 업무 진행과정상의 문제점을 분석하여 업무 능률을 효율화할 수 있는 모델을 제안하였다. 제안 모델은 발주자 및 사용자의 요구항목을 체계적으로 반영하여 초기 VE 업무의 접근 방향 및 기준 설정을 가능하게 할 것이다. 따라서 후속적으로 진행되는 분석단계의 기능분석 및 아이디어 창출 업무의 효율성을 증대시켜 성공적인 VE 성과를 도출 가능하게 할 것이다.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 1994년도 춘계공동학술대회논문집; 창원대학교; 08월 09일 Apr. 1994
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• pp.561-568
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• 1994

A man model can be used as an effective tool to design ergonomically sound products and workplaces, and subsequently evaluate them properly. For a man model to be truly useful, it must be integrated with a posture prediction model which should be capable of representing the human arm reach posture in the context of equipments and workspaces. Since the human movement possesses redundant degrees of freedom, accurate representation or prediction of human movement was known to be a difficult problem. To solve this redundancy problem, a psychophysical cost function was suggested in this study which defines a cost value for each joint movement angle. The psychophysical cost function developed integrates the psychophysical discomfort of joints and the joint range availability concept which has been used for redundant arm manipulation in robotics to predict the arm reach posture. To properly predict an arm reach posture, an arm reach posture prediction model was then developed in which a posture configuration that provides the minimum total cost is chosen. The predictivity of the psychophysical cost function was compared with that of the biomechanical cost function which is based on the minimization of joint torque. Here, the human body is regarded as a two-dimensional multi-link system which consists of four links ; trunk, upper arm, lower arm and hand. Real reach postures were photographed from the subjects and were compared to the postures predicted by the model. Results showed that the postures predicted by the psychophysical cost function closely simulated human reach postures and the predictivity was more accurate than that by the biomechanical cost function.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 학술대회 논문집 전문대학교육위원
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• pp.159-162
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• 2006

In this paper energy distribution function in $SiH_4$ has been analysed over the E/N range 0.5${\sim}$300Td and Pressure value 0.5, 1.0, 2.5 Torr by a two-term approximation Boltzmann equation method and by a Monte Carlo simulation. The motion has been calculated to give swarm parameters for the electron drift velocity, diffusion coefficient, electron ionization, mean energy and the electron energy distribution function. The electron energy distribution function has been analysed in $SiH_4$ at E/N=30, 50Td for a case of the equilibrium region in the mean electron energy and respective set of electron collision cross sections. The results show that the deduced electron drift velocities, the electron ionization or attachment coefficients, longitudinal and transverse diffusion coefficients and mean energy agree reasonably well with theoretical for a rang of E/N values.

• Journal of the Optical Society of Korea
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• 제20권4호
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• pp.524-529
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• 2016

Diagnostic sensors are demanded during plasma processes. Holograms of plasma taken with laser light without a reference beam were used to monitor behaviors of charged particles produced in nitrogen plasma as a function of electrode temperature ranging between 50 and 300℃. Holograms were characterized as a function of the pixel sum and grayscale value. Pixel sum calculated in identified grayscale ranges strongly correlated with ion density and emitted light intensity measured with a langmuir probe and optical emission spectroscopy, respectively. The performance was further evaluated with data acquired as a function of N₂ and NH₃ flow rates and improved correlations were observed in the new grayscale range. The confirmed correlations indicate that a hologram is a viable means to diagnose behaviors of plasma particles such as ions. Underlying principles are discussed in view of particle and charge composing vacuum and light.

• 대한산업공학회지
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• 제24권4호
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• pp.493-502
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• 1998

The purpose of this paper is to propose an interactive method, which is designed to select the optimal preferred alternatives for the MNDM(Multi-N type Decision- Making) problems with the-Nominal-the-best characteristics. The basic idea of the paper is essentially to eliminate inefficient alternatives based on the concept of the lass function and the cutting range instead of using the utility/value function on the group of attributes that can be considered as important by the decision-maker. As a result, the method proposed in the paper for MNDM problems can be significant in that the change of characteristics is transformed into the size of loss, which can be relatively easy to understand by decision-makers.

• Journal of Korean Vacuum Science & Technology
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• 제3권2호
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• pp.112-115
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• 1999

The real ($\varepsilon$1) and imaginary ($\varepsilon$2) parts of the dielectric function of ZnS have been measured by spectroscopic ellipsometry (SE) in the 3.7-6.0 eV photon-energy range at room temperature. The obtained dielectric function spectra reveal distinct structures at energies E0/(E0+$\Delta$0) and E1 critical points. The spectrum after chemical treatment to remove surface oxide overlayer showed that these data seem to be the best representation of the dielectric function of ZnS, having the largest $\varepsilon$2 value at E1 peak region reported so far by SE. Dielectric-related optical constants of ZnS, such as the complex refractive indices (n+n=ik), absorption coefficient, and reflectance, are also presented.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2010년도 학술발표회
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• pp.447-451
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• 2010

It is quite important for manufacturing firms to stably secure water, because industrial water is used for a variety of purposes as one of the important inputs in the production process. Despite the significance of industrial water use and the increase of industrial water demand, relatively little has studied regarding the industrial water use in Korea. This paper employs the marginal productivity approach in order to estimate the economic value of water in Korean manufacturing industry, and we use the information of 53,912 factories surveyed in 2003. The result of the likelihood ratio test shows that Trans-log is an appropriate model for estimating the data of this study. In Trans-log function model, the industry-wide output elasticity of water is 0.0104, and the marginal value is KRW 1,156 per ton. The estimated values differ across the sectors and these values range from the high value of about KRW 13,760 per ton in the transportation equipment sector to low values of KRW 428 per ton in the precision instrument sector. The research provides useful information to help policy-makers in developing and implementing more appropriate policies regarding the management and distribution of water resources by estimating the value of water resources by sector. In addition, Korean government enables the drafting of future water pricing scenarios based on the estimated value information.