MOSFET’S subjected to large-signal gate+ource voltage pulses on microsecond to millisecond time scales exhibit transient threshold voltage shifts which relax over considerably longer periods of time. This problem is important in highaccuracy analog circuits where it can cause errors at the 12 b level and above. In thk paper, transient threshold voltage shifts are characterized with respect to t...

This paper introduces a new digital control methodology for indirect energy transfer converters that is based on a hybrid controller concept. During transients, the control sets boundaries for inductor current and the output voltage based on the load conditions and the system requirements to facilitate rapid recovery and small output voltage variations. Once the output voltage is recovered, lin...

return maximization or risk minimization is goal in portfolio optimization based on mean variance theory. the structure of correlation matrices and individual variance of each asset are two main factors in optimization with risk minimization object. it’s necessary to use appropriate variance and correlation coefficient for time series with clustering volatilities feature, too. in this research,...

In designs for battery driven portable applications, the reduction of peak power, peak power differential, average power and energy are equally important. In [1], a parameter called ”cycle power pro£le function” is de£ned that captures the above power parameters and a heuristic algorithm is proposed using multiple voltages and dynamic clocking for its minimization. In this paper, we rede£ne the...

this study was conducted to determine timeliness costs in using machinery and their effects on farmers’ revenues. in addition, optimum cropping pattern was compared with the existing one assuming removal of timeliness cost. for the purpose of the study, mixed integer and linear programming methods were used. the study was conduced in marvdasht region in southern iran. the data were collected th...

in most industrial zones, electric energy is one of the most important energy sources. since electrical motors are the main energy consumers of industrial factories, consumption optimization in these motors can be considered as a main option related to energy saving. one very effective way to reduce the consumption of these equipment is to use a motor speed controllers or drives. since the loss...

this study aims to minimize the total cost of a four-echelon supply chain including suppliers, an assembler, distributers, and retailers. the total cost consists of purchasing raw materials from the suppliers by the assembler, assembling the final product, materials transportation from the suppliers to the assembler, product transportation from the assembler to the distributors, product transpo...

We examine the NFA minimization problem in terms of atomic NFA’s, that is, NFA’s in which the right language of every state is a union of atoms, where the atoms of a regular language are non-empty intersections of complemented and uncomplemented left quotients of the language. We characterize all reduced atomic NFA’s of a given language, that is, those NFA’s that have no equivalent states. Usin...

a model capable of predicting the minimum content of aflatoxin m1 (afm1) in iranian while brine cheese has been developed using a chemometric approach to determine the optimum processing conditions. renneting temperature, cut size, stirring time, press time, curd size and saturated brine ph were all regarded as process variables. three-dimensional response surface and contour plots were drawn. ...