89 research outputs found
Construction of simple dynamic models of the gamma-loop mechanism
2 A simple nonlinear limb model 1 3 The gamma loop 3 3.1 Muscle spindles....................................
Introduction of Flexible Production Bids and Combined Package-Price Bids in a Framework of Integrated Power-Reserve Market Coupling
In this article a multi-zonal integrated energy-reserve market model is proposed.Bidders in this model may submit their demand and supply bids on the one hand in the formof conventional hourly step bids and block bids, which are cleared and paid according tomarket clearing prices (MCPs). On the other hand, suppliers may submit so called flexibleproduction bids, while both suppliers and consumers may submit fill-or-kill type package-priced combined bids – these bids are accepted if their acceptance implies an improvementin the resulting total social welfare, which the market clearing algorithm aims to optimize.The model includes network constraints for the nominal case (if no reserves are activated)and also for perturbed cases when the allocated reserves are activated
Lying generators
Optimal power flow (OPF) problems are focussing on
the question how a power transmission
network can be operated in the most economic way. T
he general aim in such scenarios is to
optimize generator scheduling in order to meet cons
umption re�quirements, transmission
constraints and to minimize the overall generation
cost and transmission losses. We use a
simple lossless DC load flow model for the descript
ion of the transmission network, and
assume linearly decreasing marginal cost of generat
ors with different parameters for each
generator. We consider a scenario in which the gene
ration values regarding the OPF are
calculated by a central authority who is aware of t
he network parameters and production
characteristics. Furthermore, we assume that a cent
ral mechanism is applied for the
determination of generator payoffs in order to cove
r their generation costs and assign them
with some profit. We analyze the situation when gen
erators may provide false information
about their production parameters and thus manipula
te the OPF computation in order to
potentially increase their resulting profit. We con
sider two central payoff mechanisms and
compare their vulnerability for such manipulations
and analyze their effect on the total social
cost
ATP production optimization in biochemical mass action models with protein turnover
We introduce a simple approach to account for the ATP consumption and production in the case of mass action models of metabolic pathways including protein turnover. Under some simplifying assumptions, the method makes it possible to characterize the optimal rate of enzyme synthesis if the substrate concentrations and other rate constants are known. Furthermore we demonstrate that the proposed approach is capable of the comparison of the efficiency of different feedback laws in dynamic environment, considering time-varying substrate concentration. Copyright © 2013 IFAC
Dynamic Modeling of the Angiogenic Switch and Its Inhibition by Bevacizumab
We formulate a dynamic model of vascular tumor growth, in which the interdependence of vascular dynamics with tumor volume is considered. The model describes the angiogenic switch; thus the inhibition of the vascularization process by antiangiogenic drugs may be taken into account explicitly. We validate the model against volume measurement data originating from experiments on mice and analyze the model behavior assuming different inputs corresponding to different therapies. Furthermore, we show that a simple extension of the model is capable of considering cytotoxic and antiangiogenic drugs as inputs simultaneously in qualitatively different ways
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