We consider ad hoc wireless networks that use directional antennas and have limited energy resources. The performance objectives of such networks depend largely on the application. However, a robust performance measur...
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We consider ad hoc wireless networks that use directional antennas and have limited energy resources. The performance objectives of such networks depend largely on the application. However, a robust performance measure is the total traffic volume that the network can deliver when all nodes are equipped with a finite and non-renewable amount of energy. We show that the network's lifetime can be extended significantly by incorporating a simple measure of a node's residual energy into the node's cost function. To explore quantitatively the advantage offered by the use of directional antennas over the case of omnidirectional antennas, we consider the case of connection-oriented multicast traffic. Building upon our prior work on multicasting algorithms, we introduce two protocols that exploit the use of directional antennas and evaluate their performance. We observe significant improvement with respect to the omnidirectional case.
A gate-driver capable of switching a MOSFET at 1 MHz is proposed. The main design issues such as propagation delay and pulse width distortion have been addressed. Particular attention has been given to miniaturization...
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A gate-driver capable of switching a MOSFET at 1 MHz is proposed. The main design issues such as propagation delay and pulse width distortion have been addressed. Particular attention has been given to miniaturization of the unit with the aim of integration into an integrated power converter. The design has also focused on extensive protection features for the MOSFET, such as over-current and thermal shutdown. An experimental prototype, which can switch MOSFETs up to 800 V, has been constructed and the results presented.
In this paper, we propose a new algorithm that aids the recovery of lost packets by generating additional duplicate ACK. It is shown that by adopting this algorithm the response time and throughput of short term burst...
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In this paper, we propose a new algorithm that aids the recovery of lost packets by generating additional duplicate ACK. It is shown that by adopting this algorithm the response time and throughput of short term bursty traffic can be improved in a wireless link with high error rate.
In this paper, we develop an architecture for a novel type of neural network which is known as simultaneous recurrent neural networks (SRNNs). Using this novel neural architecture, we propose a statistical approximati...
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In this paper, we develop an architecture for a novel type of neural network which is known as simultaneous recurrent neural networks (SRNNs). Using this novel neural architecture, we propose a statistical approximation learning (SAL) method. The SRNNs have the capability to approximate non-smooth functions which cannot be approximated by using conventional multilayer perceptrons. However, most of the learning methods for the SRNNs are computationally expensive due to their inherent recursive calculations. To solve this problem, as an approximation learning method, the SAL method is proposed by using a statistical relation between the time-series of the network outputs and the network configuration parameters. Simulation results show that SRNNs trained by the proposed SAL method can learn a strongly nonlinear function efficiently within a practical computation time.
An essential factor in understanding the motor learning capability of humans, is the coordinate transformation learning of the visual feedback controller. Although a number of learning models for the visual feedback c...
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An essential factor in understanding the motor learning capability of humans, is the coordinate transformation learning of the visual feedback controller. Although a number of learning models for the visual feedback controller have been proposed, none has been able to establish a definitive approach. In our previous work, we have suggested a learning model that uses disturbance noise and the feedback error signal to learn the human visual feedback controller's coordinate transformation. However, the model does not fully consider the time delay in the visual feedback control loop. This paper presents a modified learning model taking into account the time delay and the convergence properties of the model. Numerical simulations are presented to illustrate the effectiveness of the proposed approach.
A broadband integrated photonic-antenna interface is presented that is suitable for application in multiple millimeter-wave fiber-wireless service applications. The antenna base-station module is based on hybrid integ...
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A broadband integrated photonic-antenna interface is presented that is suitable for application in multiple millimeter-wave fiber-wireless service applications. The antenna base-station module is based on hybrid integrated circuit technology and operates over the entire Ka-band (26 - 40 GHz).
Currently, several kilometers of interconnects are used to construct a state-of-the-art Si-based integrated circuit, which has up to 8 levels of metallization. The failure mechanisms and reliability of the different l...
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Currently, several kilometers of interconnects are used to construct a state-of-the-art Si-based integrated circuit, which has up to 8 levels of metallization. The failure mechanisms and reliability of the different layers of metallization are assumed to be the same in circuit-level reliability analysis. Although this may be true in Al interconnects, it may not be so for Cu dual-damascene lines. In this paper, we report on differences in the failure mechanisms between the first (M1) and second (M2) levels of Cu metallization, and how it affects the overall circuit reliability for Cu metallization.
Decision tree induction corresponds to partitioning the input space through the use of internal nodes. A node attempts to classify the instances misclassified by upper level nodes using a greedy search strategy, i.e. ...
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parallel programs executing on non-dedicated SMPs should be adaptive, that is, they should be able to execute on a dynamically varying environment without loss of efficiency. This paper defines a unified set of servic...
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