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1.
With the development of modern science and technology, the importance of small structures or microstructures (such as the fluidic nanostructure or microreactor[1], the in- tegrate circuit in microelectronics[2], the factory in a chip[3,4], etc.) has been incarnated day by day in the fields of microelectronics, micro-optical systems, microanalytical sys- tems, microelectromechanical systems and cytobiology. And the fabrication technique (microfabrication) of the small structures has become the h… 相似文献
2.
SUNG JOO PARK 《International journal of systems science》2013,44(10):1141-1152
This paper is concerned with the application of optimal control theory to the dual growth of the Korean economy. A closed two sector economic growth model is formulated by dividing the economy into agriculture and non-agriculture in order to represent the transitional phenomena between the two sectors. Taking capital and saving as state and control variables, respectively, the model governing the economic growth becomes a non-linear simultaneous differential equations with coupling terms of state and control variables. Assuming the Cobb-Douglas production function and the exponential form of the social welfare function, the necessary and sufficient conditions of the optimal control have been derived for the case of finite planning horizon by using the Pontryagin's maximum principle. Since deriving the optimal trajectories of state and control variables analytically is impossible, a numerical procedure based on the variation of extremals is used to obtain the optimal paths of the aggregate investment and consumption of the Korean economy. 相似文献
3.
This paper considers a problem of configuring both backbone and logical networks in a reconfigurable circuit-switched network where links are subject to failures. The objective is to design feasible backbone and logical networks at least cost where the cost includes backbone link capacity expansion cost, lost-call traffic penalty, and hop cost (nodal processing cost). The problem is formulated as a zero-one non-linear mixed integer programming problem, for which a solution procedure is developed by use of a Lagrangean relaxation technique and heuristic methods exploited for improving the lower and upper bounds of any intermediate solution. The solution procedure is tested for its effectiveness with various numerical examples. 相似文献
4.
Improvement of the Functionalities of Soy Protein Isolate through Chemical Phosphorylation 总被引:4,自引:0,他引:4
A method of chemical phosphorylation was developed to modify soy protein so as to improve its functional properties. The reaction was carried out by incubating soy protein isolate and cyclic sodium trimetaphosphate in an aqueous solution at pH 11.5 and 35°C for about 3 hours. The reactions ensued were the phosphoesterification of serine residues and the phosphoramidation of lysine residues in soy protein. The phosphorylated soy protein isolate prepared there-from exhibited much improved functional properties in terms of aqueous solubility, water-holding capacity, emulsifiability and whippability. The nutritive bioavailability of soy protein isolate was not impaired by phosphorylation. 相似文献
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Effect of chromium on the phase evolution and microstructure of ZnO doped with bismuth and antimony 总被引:2,自引:0,他引:2
Crystalline phase formation and microstructure of ZnO varistors with a basic composition ZnO–Bi2O3–Sb2O3 were examined. Addition of chromium oxide to this basic varistor resulted in an α-spinel (α-Zn7Sb2O12) phase dissolving a significant amount of Cr, while the β-spinel did not. β-spinel transformed to pyrochlore during cooling,
whereas α-spinel hardly transformed to pyrochlore irrespective of the cooling conditions. When Sb2O3 was completely replaced by Cr2O3, ZnCr2O4 was formed instead of spinel. α-spinel particles were 1–2 μm in size and intra- as well as intergranular. ZnCr2O4 particles, smaller than 1 μm in size, however, were present as aggregates in the bismuth-rich matrix phase at the grain boundaries.
This revised version was published online in November 2006 with corrections to the Cover Date. 相似文献