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양희룡,최승평,장차익 조선대학교 기초과학연구소 1997 自然科學硏究 Vol.20 No.1
The one-electron theory of atoms, molecules, and crystals has enjoyed a wide success in many branches of physics. This theory provides a physically appealing description of the eletronic structure of many-electron systems. In addition, this theory provides a convenient basis for performing the detailed calculations on specific many-electron systems. In such calculations, it is usually necessary to introduce many simplifying assumptions in order to make a progress. Since the principal computational difficulty posed by the Hartree-Fock equations is the treatment of the exchange terms, it would be very desirable to simplify the treatment of these terms by using Slater's the average of the exchange potential. The first order correction of the energy in the ground state of He atom is calculated by using the unperturbed wave function obtained with the Hartree-Fock-Slater approximation and compared with the result obtained by the simple analytical metod. The numerical result agrees with an experimental result for the ground state of the He atom with tolerance 0.65%.
양승룡 한국농업정책학회, 한국축산경영학회 2000 농업경영정책연구 Vol.27 No.3
One of the fundamental problems in the Korean agriculture is large price and income risks without proper means to manage it. The situation becomes worse with the Uruguay Round trade negotiations, policy changes, weakened macroeconomic circumstances, changes in the consumer taste, and so on. This study suggests use of futures and options markets as a tool to manage risks in agriculture. The government price support program can be duplicated with the put option contract. The deficiency payment program which guarantees a given income level can be made from the Asian put option more cheaply and efficiently. Works needed to the introduction of the derivatives substitutes are suggested. Key Words : 농업경영(Agricultural Management), 부족분지불제(Deficiency Payment), 선물(Futures), 옵션(Options), 위험(Risk)
楊寅台,崔勝弼,邊茂龍 江原大學校 附設 環境硏究所 1991 環境硏究 Vol.8 No.-
This study explains the basic principle of array algebra as a mathematical manipulation of the least squares estimation. Array algebra enables linear algebra to handle multi-dimensional arrays, but has the restriction of working with some form of gridded data. Digital elevation modeling, photogrammetric and satellite image processing are a few of the application to which array algebra is well suited, because the data si often collected in grid form. This study compares array algebra to the standard least squares estimation. With the use of experimental data, investigations of computational efficiency, stability, and storage requirements were performed. It was found that in all cases array algebra was superior to least squares. Weighting of array algebra and the use of the sequential formulation of the normal equations are also discussed. The sequential technique can be used with array algebra when extra observations are to be incorporated that are not part of the grid. This technique can also be used when there is missing grid information, Array algebra has been shown to be of great benefit when large numbers of parameters are to be computed efficiently.
양승룡 한국농업정책학회, 한국축산경영학회 2001 농업경영정책연구 Vol.28 No.3
This study analyzes the effect of rice price support program. The program is equivalent to a synthesized call option that provides the minimum guaranteed price to the participating farmer. The theoretical effect is graphically demonstrated. A mathematical programming model is also constructed to simulate the effect of target price changes. The simulation results show that this program can increase the farmers' income when the quantity procured by the program decreases. Since the total budget for the program is fixed each year, the rise of the target price reduces the procurement quantity. The results only show that the farmers would receive higher income without the program. Several alternatives are suggested accordingly.
몬테카를로 방법에 의한 수소분자의 기저상태 에너지의 수치 해석적인 계산
양해정,양회룡,정진,김미정,최승평,장차익 조선대학교 기초과학연구소 2000 自然科學硏究 Vol.23 No.1
Numerical methods that are known as Monte as Monte Carlo methods can be loosely described as statistical simulation methods, where statistical simulation is defined in quite general terms to be any method that utilizes sequences of random numbers to perform the simulation. Monte Carlo methods are now used routinely in many problems, the simulation of the esoteric subnuclear processes in high energy physics experiments, cellular automata, self-organized critical phenomena, the Ising spin glass, the simulation of a Bingo game, etc. The physical processes are simulated directly, and there are no needs to even write down the differential equations that describe the behaviors of the systems. The only requirement is that the physical systems be described by probability density functions. We consider with the Monte Carlo variational method and the Monte Carlo path integral method(MCPI). These methods are used to calculate the energy of the ground states of H2 molecule by the formal similarity between the Schroedinger equation and the multi-dimensional diffusion equation.
설문조사를 통한 농산물 물류센터의 이용실태와 성과 분석
문진영,양승룡,한두봉,정복조 한국농업정책학회, 한국축산경영학회 2000 농업경영정책연구 Vol.27 No.2
This study analyzes the performance of the newly introduced agricultural marketing system, Agricultural Wholesale and Distribution Centers. Surveys for farm producers, retailers, and consumers were conducted for the analysis. Each group of the respondents points out many problems including the pricing mechanism and quality control. Suggestions are made to improve the performance of the new marketing system.