The purpose of this study is estimation of daily Value at Risk (VaR) for total index of Tehran Stock Exchange using parametric, nonparametric and semi-parametric approaches. Conditional and unconditional coverage backtesting are used for evaluating the accuracy of calculated VaR and also to compare the performance of mentioned approaches. In most cases, based on backtesting statistics Results, ...

Abstract. We consider a non linear ordinary differential equation and want to control its behavior so that it reaches a target by minimizing a cost function. Our approach is to use hybrid systems to solve this problem: the complex dynamic is replaced by piecewise affine approximations which allow an analytical resolution. The sequence of affine models then forms a sequence of states of a hybrid...

When information agents are organized to provide some composed functionality, their interactions can be formally represented as workflows. Traditionally, workflows are executed by centralized engines that invoke the necessary agents and collect results. If agents are clustered (e.g., based on geographic criteria), locally routing intermediary results between agents in the same cluster can be mo...

While it is possible to reduce processor clocking and latch power by adopting a globally asynchronous and locally synchronous approach, that approach tends to make the machine appear asynchronous at its highest level of description. In developing the circuitry of IPCMOS, we have taken rather the reverse approach, in which a globally synchronous processor is provided with locally asynchronous st...

Management of locally advanced colon cancer metastases is challenging and operation carries an increased risk of morbidity and mortality. The knowledge of exact sites of involvement can aid the surgeon to make a decision regarding complete resection or palliative therapy. PET/CT scan is an advantage in this setting because metabolic alterations often precede the anatomic changes; moreover, it c...