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막여과공정에서의 비용계산식 모델링 및 조작변수에 따른 비용의 변화에 대한 연구
김병직,왕진수 崇實大學校 生産技術硏究所 1996 論文集 Vol.26 No.1
A cost model for water filtration system using membrane was studied. Capital cost was the sum of non-membrane cost and membrane cost. And Operating cost consisted of energy, chemical, and membrane replacement cost. Integrated mathematical model was developed to estimate the capital and operating cost of variouw size membrane systems. The mathematical medel was translated into C program for convenient and quick use. By use of the program developed, the effect of Permeate Flux, Membrane diameter and service life, cross-flow velocity on total cost was studied. The results of sencitivity analysis are as follows: The cost was inversely related to permeate flux since the number of modules increased as reducing thepermeate flux. The membrane life had a significant effect on the operating cost. Cost of membrane per module decreased with increasing membrane element diameter.The head-loss across the membrane module was inversely proportional to the diameter of the element. Also deposition of material on the membrane surface could be reduced by increasing cross-flow velocity.
무선 네트워크에서 효율적인 전력 제어 게임을 위한 적응 자원 할당 기법
왕진수(Jin Soo Wang),박재철(Jae Cheol Park),황성현(Sung Hyun Hwang),김창주(Chang Joo Kim),김윤희(Yun Hee Kim) 한국통신학회 2009 韓國通信學會論文誌 Vol.34 No.3A
본 논문에서는 여러 무선 링크가 존재하는 무선 네트워크에서 좀 더 낮은 송신 전력으로 각 링크가 요구하는 전송률을 만족시키는 분산 자원 할당 기법을 고려한다. 이 때 해결하고자 하는 문제는 분산 전력 제어 게임이 안정적으로 수렴하도록 간섭 환경에 따라 무선 자원을 공유하는 링크 수와 그에 따라 자원 크기를 바꾸는 것이다. 제안하는 기법은 링크 사이의 자원 공유 수준을 정의하고 자원 공유 수준 정보를 교환하여 자원을 공유할 링크와 자원 크기를 분산적으로 결정함으로써 중앙 집권적인 최적 자원 할당보다 교환 정보와 복잡도를 줄인다. 제안 기법은 자원을 항상 공유하거나 직교하게 이용하는 경우보다 송신 전력이 적게 필요하면서 최적 자원 할당과 비슷한 성능을 보인다. We consider distributed resource allocation among the links in a wireless network to minimize the total transmit power of the network while meeting the target rate required by each link. The problem to be solved is how to change the amount of wireless resource allocated and the number of links sharing the resource according to the interference environment so that the following distributed power control game converges to a stable point. To provide a distributed method with less complexity and lower information exchange than the centralized optimal method, we define the resource sharing level among the links from which the size of resource allocated and the links sharing the resource are determined distributively. It is shown that the performance of the proposed method is better than that of the conventional methods, orthogonal resource allocation only and resource sharing only, as well as it approaches to that of the optimal method.
중공사 형태의 막여과 공정에서 압력 강하 및 에너지 소비에 관한 연구
왕진수,김병직 崇實大學校 生産技術硏究所 1995 論文集 Vol.25 No.2
Pressure difference is required to purity the untreated water in a membrane-based process. It affects the initial cost and operating cost of the system. Generally, the greater the pressure difference is, the more expensive the water filtration system is. From the experimental data and the derived equations, several design parameters that affect the pressure drop were investigates. The effect of temperature, crossflow velocity, and internal diameter of a fiber on the pressure drop was studied. Within the temperature range of 0℃ to 40℃, as feed water temperature increased, pressure drop required to purify the quantity of the untreated water decreased. And as the crossflow velocity increased, the pressure drop increased. The diameter of 1mm was thought to be a critical size. Below that size, as decreasing the diameter the pressure drop increased sharply. On the other hand, above that size, the pressure drop did not change much with increasing the diameter. Also, the energy cost to produce 1 ton of water was calculated for various modes of membrane-based water treatment systems.