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1.
The aim of this paper is to identify the denumerable stochastic systems which have an optimal strategy, namely, to give general sufficient conditions of the existence of an optimal strategy for denumerable Markovian decision processes. The aim is accomplished by using Markov potential theory and showing the range of the validity of a method to find an optimal strategy called Howard's technique. Since Markov potential theory helps to characterize the properties of evaluations of strategies on such processes, it plays an important role to find the sufficient conditions mentioned above For Markov potential theory, new concepts are introduced such as absorbable chains, quasi-potentials, etc., and using them, sufficient conditions for the existence of a solution of the equation x = f+Px are generalized to the one's for cyclic chains and multi-chains The results obtained in this paper are as follows : if a system represents a strong Markov chain for any strategy, then there exists an optimal strategy with respect to the total or the mean expected earnings, and for any stochastic system there exists an optimal strategy with respect to the discounted total expected earnings. 相似文献
2.
This paper deals with the design of a two-degrees-of-freedom (TDF) dead-beat controller with both optimal robustness and minimum settling time. Based on the parametrization of all stabilizing TDF controllers, optimal robustness and minimum-time control are achieved simultaneously. The minimum-time dead-beat control is constructed for arbitrary real-rational reference input. At the same time, optimal robustness is achieved under the constraint that the error between reference input and output asymptotically vanishes for any plant perturbation that does not violate the internal stability. It is proved that under the same robustness criterion, irrespective of its length of settling time, the optimal robustness of the TDF system is always superior to that of the one-degree-of-freedom (ODF) system as long as its settling time is finite, and they become identical only when the settling time of the ODF system goes to infinity. A numerical example is given to illustrate the theoretical results. 相似文献
3.
MORISHIGE KIMURA 《International journal of systems science》2013,44(8):1551-1573
A discrete-time time-invariant linear system (DILS) is considered which has resulted from the discretization of a continuous-time time-invariant linear system (CILS) by the zero order hold. In this system, the system and input matrices are given by exp(AT) and $ where A and B are the system and input matrices of the CILS, and T is a sampling interval. Since they involve the matrix exponential, their computations are not easy. First, on the assumption that the Kalman canonical form of the CILS is sought, a formal Kalman canonical form of the DILS is determined. Second, with the use of this form and the decomposition of A into the projectors onto the generalized eigenspaces, an algorithm is presented which computes the system and input matrices of the DlLS. 相似文献
4.
KINETICS OF BIOETHANOL PRODUCTION FROM WHEAT MILLING BY-PRODUCTS 总被引:1,自引:0,他引:1
MARCOS ANTONIO DAS NEVES NAOTO SHIMIZU TOSHINORI KIMURA KIWAMU SHIIBA 《Journal of food process engineering》2007,30(3):338-356
An overview of the potential application of wheat milling by‐products as substrate for bioethanol production is presented. In order to select a suitable microorganism, model fermentations were conducted using glucose and dry baker's yeast. The overall ethanol yield was nearly stable (ca. 0.35 g/g), independent of mash glucose concentration; mashes with 100 g glucose/L resulted in an overall ethanol productivity of 3.48 g/L·h. Slurries containing low‐grade wheat flour (LG) (100, 200 or 300 g/L) were used for simultaneous saccharification and fermentation (SSF) with Zymomonas mobilis. Fermentation performance was evaluated based on ethanol concentration (P), productivity (Qv), yield (YP/S), production rate (Qp) and glucose consumption rate (Qs). Mashes containing 200 g LG/L produced about 52 g ethanol/L, with Qvof 2.17 g/L·h. Based on the relatively high fermentation rate of LG, reaching peak ethanol productivity within ca. 9 h of SSF, considerable savings on fermentation time was achieved. Using Z. mobilis for LG fermentation, P was about 30% higher than that obtained with Saccharomyces cerevisiae. 相似文献
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7.
TOSHIO KIMURA TAKANOBU KANAZAWA TAKASHI YAMAGUCHI 《Journal of the American Ceramic Society》1983,66(8):597-600
The reaction between Bi2 O3 and TiO2 in molten LiCl-KCl was examined with special emphasis on the reaction mechanism and the size of Bi4 Ti3 O12 particles. The oxides reacted with LiCl to form an intermediate compound, which changed into Bi4 Ti3 O12 on extended heating. Potassium chloride retarded the reaction between the oxides and LiCl and promoted the change from the intermediate compound to Bi4 Ti3 O12 . Bi4 Ti3 O12 particles prepared in the flux were platelike, irrespective of the preparation conditions, but their size depended on reaction temperature and time, the ratio of LiCl to KCl, and the amount of flux. 相似文献
8.
The mesogloea and skin of a common edible jellyfish, Stomolophus nomurai, were characterized with respect to amino acid composition and compared with a commercially salted jellyfish. Then the mesogloea was digested with pepsin at 3°C for 48 hr and its solubilized protein was isolated and subjected to biochemical analyses. These composite results have shown that the major edible component of jellyfish was the connective tissue protein, collagen, characterized by its high content of hydroxylysine and its glycosides. 相似文献
9.
Mn和V对TiAl金属间化合物在900℃(Na,K)2SO4熔盐中热腐蚀行为的影响有所不同.TiAl合金中加入Mn后,最外层的腐蚀产物为以Al2O3为主、另有少量TiO2的混合物;内层是Al,Ti和Mn的混合氧化物以及Ti的硫化物.加Mn在一定程度上减弱了TiAl合金的耐蚀性TiAl和TiAl-Mn合金中加入V后耐蚀性明显变差,最外层腐蚀产物以TiO2为主,并含有少量Al2O3和微量的V2O5,腐蚀层中的V2O5引起Al2O3的酸性溶解,因而不能形成保护性的Al2O3层,形成的TiO2和Al2O3混合膜的黏附性差,较易剥落。 相似文献
10.
Feng ZHANG Katsunori OKAWA Makoto KIMURA 《Frontiers of Architecture and Civil Engineering in China》2008,2(3):233-241
In this paper, dynamic behavior of a grouppile foundation with inclined piles in loose sand has been investigated with centrifuge
model tests. The test results are also simulated with elastoplastic dynamic finite element method, in which, not only sectional
force of piles, stress of ground, but also deformation of piles are calculated using a three-dimensional elastoplastic dynamic
finite element analysis (Code name: DGPILE-3D). The numerical analyses are conducted with a full system in which a superstructure,
a pile foundation and surrounding ground are considered together so that interaction between pile foundation and soils can
be properly simulated because the nonlinearities of both the pile and the ground are described with suitable constitutive
models. Different types of piles, vertical pile or inclined pile, are considered in order to verify the different characteristics
of a group pile foundation with inclined piles. The validity of the calculation is verified by the model tests. 相似文献