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Stability conditions for state-delay systems are derived based on the norm of semigroup, which describes the transition of the internal state. Introducing an exact calculation method of the semigroup norm, the conditions for the internal stability and the marginal stability are characterized by non-singularity of a transcendental function. The conditions depend on the existence of time interval such...
This paper extends the nonlinear ISS small-gain theorem to a large-scale time delay system composed of three or more subsystems. En route to proving this small-gain theorem for systems of differential equations with delays, a small-gain theorem for operators is examined. The result developed for operators allows applications to a wide class of systems, including state space systems with delays.
The paper addresses the problem of H?? model reduction for uncertain Markovian jump systems with time-varying delay and uncertain switching probabilities. The purpose is to find a low-order model which can be used to approximate the original system such that the error system has a prescribed H?? performance. A sufficient condition is obtained in the form of matrix inequality. The cone complementary...
We consider the minimum-variance filtering problem for estimating the state of networked control systems where both random measurement transmission delays and packet dropout may occur. Instead of following many existing published results that solve the problem using probabilistic approaches, we propose a non-probabilistic approach by stamping the measurements or packets. Both single-measurement and...
We study the problem of maximizing the aggregated revenue in sensor networks with deadline constraints. Our model is that of a sensor network that is arranged in the form of a tree topology, where the root corresponds to the sink node, and the rest of the network detects an event and transmits data to the sink over one or more hops. We assume a time-slotted synchronized system and a node-exclusive...
We consider problems where multiple agents cooperate to control their individual state so as to optimize a common objective while communicating with each other to exchange state information. Since communication costs can be significant, we seek conditions under which communication of state information among nodes can be minimized while still ensuring that the optimization process converges. In prior...
In an unstructured peer-to-peer (P2P) network (e.g., Gnutella), participating peers choose their neighbors randomly such that the resultant P2P network mismatches its underlying physical network, resulting in the lengthy communication between the peers and redundant network traffics generated in the underlying network. Previous solutions to the topology-mismatch problem in the literature are far from...
This paper presents an overview of proportional-integral-derivative (PID) controller and it's tuning. Two systems are selected for study. One is higher order system and the other is first order system with time delay. The performance of PID tuning techniques is analyzed on the basis of frequency response parameter that is phase margin. Simulation results are presented and performances of different...
Data streaming (DS) over peer-to-peer (P2P) networks has been intensively studied in recent years and there have been various schemes proposed already. To evaluate these schemes, either measurement in experimental implementations, or simulation and theoretical analysis have been used. The former is inadequate as data are collected from different experiments, while the latter lacks a proper theoretical...
Consistency and responsiveness are two important factors in providing the sense of reality in Distributed Virtual Environment (DVE). However, it is not easy to optimize both aspects because of the trade-off between these two factors. As a result, most existing consistency maintenance methods ignored the responsiveness requirements, or just assumed a simple responsiveness requirement model which cannot...
In this paper, we reveal several characteristics of a broadcast communication protocol called DSCF (Directional-Store-Carry-Forward). In recent years, realization of VANETs (Vehicular Ad-hoc Networks) has been demanded for delivering information to vehicles at a low cost. In VANETs, a vehicle may or may not find other vehicles within its radio communication range because of vehicles' mobility, which...
Aiming at improving the accuracy of identifying pin attribute of unknown logic device, the paper analyses the signal timing relationship and signal logic corresponding relationships. A method, which is comprised of identifying algorithm and amending algorithm based on time-delay field, is proposed. The experimental results show that the method can improve the correct rate of the identifying pin attribute.
This paper proposes a new fuzzy-based multi-rate STBC transmission method over dynamic fading channels in order to have an optimal channel usage and to control performance according to the instantaneous channel situations. The proposed method employs a fuzzy inference system (FIS) over estimated average delay and minimum value of cost function designed for Alamouti code in each block decision. We...
The use of redundant number systems can significantly improve computational performance in numerically intensive applications, however, the implementation of their arithmetic circuits is usually expensive because multiple bits are needed for each symbol (digit). This paper presents efficient adder circuits specifically targeted to the low cost FPGA architectures of the Xilinx Spartan 3 and the Altera...
This paper describes PGR, an architectural technique to reduce dynamic power via GlitchLess or to improve performance via clock skew scheduling (CSS) and delay padding (DP). It is integrated into VPR 5.0, and is invoked after the routing stage. We use programmable delay elements (PDEs) as a novel architecture modification to insert delay on FF clock inputs, enabling all optimization steps to share...
Enterprises are physically distributed over different locations like continents, countries, plants, divisions, laboratories, departments, work-groups and so on. However, logically an enterprise can function as one unit of work. To support such logical unity among the dispersed objects, a generic framework of distributed computing is necessary. As there is no global clock available to synchronize the...
We study opportunistic scheduling algorithms in a wireless network with a central base station communicating with multiple users on a single shared channel using time division multiple access. We assume the coexistence of both rate guaranteed (RG) users and best effort (BE) users in the system. A RG user asks for a specific transmission rate and the system should provision the exact amount being asked...
We have developed new digital receiver architecture that can demodulate a higher-order modulation signal, such as a 16-QAM signal, without losing any information even if an RF carrier is sampled at a frequency much lower than the carrier frequency. The sampling frequency is set so that a phase relationship of the sampling point of an alias signal generated by sampling a carrier at a sampling frequency...
Considering the characteristics of the propagation of worm, we can analyze it by epidemic model. In this paper, considering that to re-assembly system and the use of anti-virus software will take a period of time, so we introduce a time-delay to describe this period of time. On this basis, we build a SIDRQ model for Internet worm virus propagation depended on the two-factor model. By using the theory...
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