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In Wireless Multimedia Sensor Networks (WMSNs), data fusion and collaborative in-network processing operations often require effective multimedia synchronization control. Extensive researches have been done in the traditional networks. Most of these works assume that there exists a powerful synchronization controller in the network. However, for WMSNs, the in-network processing of the multimedia content...
This paper presents an approach for implementing a 8-tap high-performance digital FIR (Finite Impulse Response) filter using Logarithmic Number System(LNS). In the past, FIR filters were implemented by conventional number system; therefore, the speed was limited due to the multiply accumulate operations. We realize a fast FIR filter by utilizing the Logarithmic Number System, which allows simple implementation...
As the value of reputation systems is widely recognized, the incentive to manipulate such systems is rapidly growing. We propose TAUCA, a scheme that identifies malicious users and recovers reputation scores from a novel angle: combination of temporal analysis and user correlation analysis. Benefiting from the rich information in the time-domain, TAUCA identifies the products under attack, the time...
Soft errors in combinational logic have been considered as an important challenge for VLSI circuit design. As a kind of representative element of combinational logic, adders are widely used in arithmetic units. This paper presents a cost effective soft error mitigation technique for high speed parallel adders. By exploiting inherent hardware redundancy and temporal redundancy of circuit, this technique...
Dual-rail precharge (DRP) logic styles, such as wave dynamic differential logic (WDDL), have been proposed as a countermeasure against differential power analysis (DPA) for years. Because of the constant transition rate, the correlation between power consumption and signal values is significantly reduced. However, leakage still occurs in these logic styles caused by the difference of signal delay...
Acoustic sensor networks can provide rich multimedia information, which doubtlessly benefit a plethora of data hungry applications such as environment monitoring, health care, emergency response, and security surveillance. In this paper, we study the data unit delivery process of cluster head by developing a discrete-time Markov chain model and a M/G/1 queue model, based on a single-hop cluster-based...
There have been many time synchronization protocols proposed for sensor networks. However, the security problems related to time synchronization have not been fully solved yet. If malicious entities manipulate time synchronization, failures of many functionalities in the sensor networks would occur. In this paper, we identify various attacks against time synchronization and then develop a detection...
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