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Wang W.-Q.,Northwestern University | Wang W.-Q.,Sichuan Jiuzhou Electrical Group Co. | Song Z.-X.,Northwestern University | Mao X.-F.,Northwestern University
Applied Mechanics and Materials | Year: 2014

Nowadays, there are so many requirements for time-sensitive in designing Ad Hoc network. However, the existing protocols of MAC, such as ALOHA, CSMA, IEEE802.11 etc. which use the "back-off" to avoid collision, or use the "hand shaking" to order the channel bring the time-delay to MAC. The paper promote a MAC protocol named ISA-MAC which adopts FH-TH combine concatenated coding to relieve channel-collision, improve the efficiency of communication and provide the ability "sending at anytime". © (2014) Trans Tech Publications, Switzerland. Source


Bao P.,Shenzhen Institute of Information Technology | Bao P.,Southwest University of Science and Technology | Bao P.,Sichuan Jiuzhou Electrical Group Co. | Bao P.,University of Electronic Science and Technology of China
Applied Mathematics and Information Sciences | Year: 2012

Localization is crucial to many applications in wireless sensor networks (WSN). In some applications, all nodes are constantly moving in the network. The current algorithms do not appropriately address the problem of enabling nodes of mobile wireless sensor networks (MWSN) to determine their locations. To solve this problem, a new range-free localization algorithm (SSML) based on the idea of sector scan for MWSN is proposed. By using sector scan, the proposed algorithm minimizes the overlapping areas determining the location of the unknown nodes. Therefore, the localization accuracy can be improved. The simulation results shows that SSML algorithm can obviously improve the localization accuracy compared with Convex and Monte Carlo Localization (MCL), and the accuracy of the SSML is lower than 10%. © 2012 NSP Natural Sciences Publishing Cor. Source


Gong M.,Sichuan Jiuzhou Electrical Group Co. | Guo F.,Southwest University of Science and Technology
Chinese Journal of Physics | Year: 2011

The phenomenon of stochastic resonance (SR) in a time-delayed bistable system with square-wave signal, asymmetric dichotomous noise, and colored noise is investigated. Applying the small delay-time approximation, under the adiabatic limit condition, we obtain the expression of the signal-to-noise ratio (SNR) of the system. It is found that the SNR varies non-monotonically with the delay-time and the correlation of the colored noise. Moreover, the SNR exhibits SR behavior as a function of the intensity and asymmetry of the dichotomous noise, as a function of the amplitude of the square-wave, as well as of the strength of the colored noise. The non-linear effect of the system parameters on the SNR is also analyzed. © 2011 The Physical Society of the Republic of China. Source


Gan L.,Chongqing University of Posts and Telecommunications | Zhu J.,Chongqing University of Posts and Telecommunications | Miao D.,Sichuan Jiuzhou Electrical Group Co.
Dianzi Keji Daxue Xuebao/Journal of the University of Electronic Science and Technology of China | Year: 2010

Eye detection plays a very important role in the face recognition. This paper expands a Haar features by using Adaboost algorithm to accurately detect the eye. By combining an extremely efficient classifier based on Adaboost algorithm, the wide outlines of eye and eyebrow are detected, and then the templates of these wide doutlines are formed. Finally, these templates are used to match the pictures with eyes and eyebrow. Result shows that the wrong judgement due to the similitude of the eyes and eyebrow can be avoided. Source


Gong M.,Sichuan Jiuzhou Electrical Group Co. | Guo F.,Southwest University of Science and Technology
Journal of Statistical Physics | Year: 2011

The influence of delayed-time and colored-noise in a bistable system subject to asymmetric dichotomous noise and colored noise is studied. Applying small delay-time approximation, under the adiabatic limit condition, the expression of the signal-to-noise ratio (SNR) of the system is obtained. It is found that, the SNR varies non-monotonously with the delayed-time and the correlation of the colored noise. Moreover, the SNR exhibits SR behavior when it is plotted as a function of the intensity and asymmetry of the dichotomous noise, and as a function of the strength of the colored noise. © 2011 Springer Science+Business Media, LLC. Source

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