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We study the impact of random dopant fluctuation (RDF) on electrical characteristics of 10-nm-gate high-κ/metal gate gate-all-around silicon nanowire MOSFET devices. To provide the best accuracy of device simulation, model parameters are validated by using full quantum mechanical simulation and calibrated with experimental results. Physical mechanism of RDs inside channel and penetration from the...
This paper presents an ultra-low quiescent current output capacitor-less Low-dropout (LDO) regulator with a novel slew-rate-enhanced (SRE) circuit. By adopting the novel SRE circuit, the transient response of the regulator was improved apparently. Simulation results show that, the LDO regulator consumes a quiescent current of only 930nA at steady state.
Taking planar phased array for example, the beam patterns for sonar array installed in different positions are studied using the finite element analysis software ANSYS and the acoustic software SYSNOISE. The conditions that the sonar array is installed parallel to the vessel, parallel to the acoustic window and the sonar array is installed at different distances from the acoustic window are considered...
In this paper, the problem of distributed multiuser Opportunistic Spectrum Access is studied based on Partially Observable Markov Decision Process (POMDP), where the channels are partially observed by secondary users (SUs) constrained by hardware and energy. Considering the similarity of spectrum environment, the decision of every secondary user may be the same, which leads to collisions. Comparing...
In order to solve recognition of modulation signals, which is an important issue in cognitive radio, the paper proposes a new algorithm of recognition of modulation signals. The paper firstly analyzes a new algorithm of cooperative sensing and simulates it in low SNR. Secondly, it proposes new expressions of transient characteristic parameters and shows the procedure of how to define the thresholds...
Edge detection is a commonly performed operation in image processing. In this paper, we propose a new method for edge detection using the logarithm function. The pixel values within a mask are normalized so that they can be regarded as probabilities. A positive constant is added to the probabilities to avoid zero values. Then, the sum of the logarithms of the adjusted probabilities is calculated....
Replicated distributed file systems are designed to store large file reliably across lots of machines, and it arouse the problem of selecting the nearest replica for clients. In this paper, we propose Rigel, a Network Coordinates (NC) based nearest replica selection service, which is an effective infrastructure to select the nearest replica for client in a scalable and lightweight way. Our simulation...
Network coordinate (NC) system is an efficient mechanism to predict Internet distance (latency) with limited times of measurement. In this paper, we focus on the node churn problem in distributed NC systems. Our study on Vivaldi, a representative distributed NC system, shows that under high node churn rate the prediction accuracy of the system will be seriously impaired, which renders the system unusable...
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