Science and Technology on Electronic Information Control Laboratory

Chengdu, China

Science and Technology on Electronic Information Control Laboratory

Chengdu, China
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Yang S.,Science and Technology on Electronic Information Control Laboratory | Tang W.,University of Electronic Science and Technology of China
Proceedings - 2016 UKSim-AMSS 18th International Conference on Computer Modelling and Simulation, UKSim 2016 | Year: 2016

To reduce the cost of network-wide broadcast in wireless sensor networks (WSNs), it's a common practice to establish a connected dominating set (CDS). A lot of algorithms have been proposed to construct CDS, and most of them aim at reducing the size of the created CDS. Existing distributed algorithms require that all nodes exchange announcement messages to acquire local topology in order to construct CDS. However, the process of construction and maintenance of CDS can cause huge overhead, especially in the context of WSNs, where the node density is high and the quantity of nodes is large. In this paper, we focus upon reducing the overhead of the CDS construction process, and propose a highly efficient distributed algorithm based on our previous work. We show that, to construct a CDS, a portion of nodes in the network don't have to generate announcement messages. An opportunistic announcement scheme is presented to determine such nodes. Simulation results show that the proposed algorithm greatly reduces the overhead compared to existing algorithms, while the size of the established CDS remains the same. An interesting fact is shown that certain nodes can just keep silent during the whole process of construction and maintenance of CDS. © 2016 IEEE.

Chen J.,Beijing Institute of Technology | Chen W.,Science and Technology On Electronic Information Control Laboratory | Sun J.,Beijing Institute of Technology
IET Control Theory and Applications | Year: 2017

Multiple model adaptive control (MMAC) with second-level adaptation is a recently proposed methodology for dealing with systems where the parametric uncertainty is large. Compared with the multiple model switching scheme, the new scheme can lead to significant improvements in performance. Some research has been conducted using the new scheme, but all of the results concern linear systems with an adaptive identification model set. In this study, MMAC with second-level adaptation scheme is extended to non-linear systems in strict feedback form, and the fixed identification model set is under consideration. This is motivated by the fact that a smooth controller can lead to smooth performance and the fixed identification model set gains potential advantages over the adaptive identification model set, especially for the case that the parameters of the system change over the time. Design details are presented and the stability of MMAC with second-level adaptation using a fixed identification model set for non-linear systems is given, which has not been discussed before. Finally, two simulations are performed to show that this scheme performs much better than conventional schemes, including adaptive control and multiplemodel switching schemes, in terms of convergence speed and transient performance. © 2017 The Institution of Engineering and Technology.

Zheng Y.,PLA Air Force Aviation University | Gao J.,PLA Air Force Aviation University | Xu L.,Science and Technology On Electronic Information Control Laboratory | Cao X.,PLA Air Force Aviation University | Liu T.,PLA Air Force Aviation University
IEEE Antennas and Wireless Propagation Letters | Year: 2017

A composite artificial magnetic conductor (AMC) surface has been proposed for ultrawideband and polarization-independent radar-cross-sectional (RCS) reduction. Three different AMC units are employed to form the composite surface, which make up of destructive phase difference (180° ± 30°) over a broad frequency range. It is analytically shown that an ultrawideband RCS reduction is achieved from 5.0 to 20.0 GHz for arbitrary polarizations. The RCS reduction value exceeds 10.0 dB almost from 6.0 to 18.4 GHz, resulting in a fractional bandwidth of 101.6%. To verify the proposed design method, the AMC surface specimen is fabricated and measured, and the experimental results agree well with the simulations. © 2017 IEEE.

Yang S.,Science and Technology on Electronic Information Control Laboratory | Tang W.,University of Electronic Science and Technology of China
Proceedings - UKSim-AMSS 8th European Modelling Symposium on Computer Modelling and Simulation, EMS 2014 | Year: 2014

In this paper, we discuss the intra- and inter-path interference problems of multiple-path transmission in multiple-hop wireless networks, and show that classical node-disjoint paths are highly sensible to these problems, thus incapable of providing ideal throughput for multiple-path transmission. To tackle the problems, this paper gives a detailed analysis to the intra- and inter-path interference problems based on graph theory. Being aware that node-disjoint ness is no longer adequate to describe the properties of paths that are capable to provide the maximum throughput for multiple-path transmission, the new concepts of irreducible and neighbor-disjoint paths are proposed. Via detailed discussion, the theoretical upper bound of throughput achievable by multiple-path transmission via irreducible and neighbor-disjoint paths with at least 3 hops is given. It's proved that, by using irreducible and neighbor-disjoint paths, multiple-path transmission is capable to achieve near capacity throughput. © 2014 IEEE.

Zou X.,Southwest Jiaotong University | Zou X.,INRS - Institute National de la Recherche Scientifique | Zou X.,Science and Technology on Electronic Information Control Laboratory | Zou X.,University of Ottawa | And 6 more authors.
Optics Letters | Year: 2013

Optical filters with an ultranarrow and rectangular spectral response are highly desired for high-resolution optical/ electrical signal processing. An all-fiber optical filter based on a fiber Bragg grating with a large number of phase shifts is designed and fabricated. The measured spectral response shows a 3 dB bandwidth of 650 MHz and a rectangular shape factor of 0.513 at the 25 dB bandwidth. This is the narrowest rectangular bandpass response ever reported for an all-fiber filter, to the best of our knowledge. The filter has also the intrinsic advantages of an all-fiber implementation. © 2013 Optical Society of America.

Zhang X.,University of Sichuan | Zhang X.,Science and Technology on Electronic Information Control Laboratory | Wei C.,State University of New York at Buffalo | Liu Y.,University of Sichuan | And 2 more authors.
Annals of Physics | Year: 2014

In this paper we use Dirac function to construct a fractional operator called fractional corresponding operator, which is the general form of momentum corresponding operator. Then we give a judging theorem for this operator and with this judging theorem we prove that R-L, G-L, Caputo, Riesz fractional derivative operator and fractional derivative operator based on generalized functions, which are the most popular ones, coincide with the fractional corresponding operator. As a typical application, we use the fractional corresponding operator to construct a new fractional quantization scheme and then derive a uniform fractional Schrödinger equation in form. Additionally, we find that the five forms of fractional Schrödinger equation belong to the particular cases. As another main result of this paper, we use fractional corresponding operator to generalize fractional quantization scheme by using Lévy path integral and use it to derive the corresponding general form of fractional Schrödinger equation, which consequently proves that these two quantization schemes are equivalent. Meanwhile, relations between the theory in fractional quantum mechanics and that in classic quantum mechanics are also discussed. As a physical example, we consider a particle in an infinite potential well. We give its wave functions and energy spectrums in two ways and find that both results are the same. © 2014 Elsevier Inc.

Wang J.,Beijing Jiaotong University | Zhang W.,Science and Technology on Electronic Information Control Laboratory | Liu W.,University of Sheffield
Multidimensional Systems and Signal Processing | Year: 2016

An enhanced eigenspace-based beamformer (ESB) derived using the minimum sensitivity criterion is proposed with significantly improved robustness against steering vector errors. The sensitivity function is defined as the squared norm of the appropriately scaled weight vector and since the sensitivity function of an array to perturbations becomes very large in the presence of steering vector errors, it can be used to find the best projection for the ESB, irrespective of the distribution of additive noises. As demonstrated by simulation results, the proposed method has a better performance than the classic ESBs and the previously proposed uncertainty set based approach. © 2016 Springer Science+Business Media New York

Wu J.,Science and Technology on Electronic Information Control Laboratory
2015 IEEE International Conference on Information and Automation, ICIA 2015 - In conjunction with 2015 IEEE International Conference on Automation and Logistics | Year: 2015

The detection of early manmade fire carries profound meaning in warning systems to prevent fire-related terrorist attacks. Despite a large number of work on fire detection in the computer vision literature, there is no specific method for early stage manmade fire detection, our best knowledge. Compared to traditional fire detection, there is less information on early stage man-made fire for detection, because of the small scale and short appearance. In this paper, an algorithm is proposed by combining the characteristics of fire with human activity. Experimental comparisons have shown that our algorithm has outperformed the state-of- The-art fire detection methods, as the initial combustion is considered. © 2015 IEEE.

Zhang W.-J.,Science and Technology on Electronic Information Control Laboratory | Gao Z.-Z.,Science and Technology on Electronic Information Control Laboratory | Xu B.,Science and Technology on Electronic Information Control Laboratory | Gao S.-W.,Science and Technology on Electronic Information Control Laboratory
Xi Tong Gong Cheng Yu Dian Zi Ji Shu/Systems Engineering and Electronics | Year: 2011

The improvement of the capability to detect dim targets is commonly realized by long-term accumulation. In order to detect those high speed targets, a novel radar signal processing method based on Keystone transform for surveillance radar is presented, which is able to compensate the range migration effect caused by long dwell time and high speed motion of targets. The target energy is accumulated effectively, and Doppler ambiguity is solved by data fusion. Finally, the target detection and parameter estimation are implemented. The proposed method can be used to detect multiple dim targets with different ranges and velocities by long-term coherent accumulation. Meanwhile, the speed measurement resolution is improved significantly with the number of pulses increased. Multi-target simulation results illustrate the effectivity of the proposed method.

Wang J.,Xiamen University | Wang J.,Science and Technology on Electronic Information Control Laboratory | Luo Z.,Xiamen University | Zhou M.,Xiamen University | And 6 more authors.
IEEE Photonics Journal | Year: 2012

We demonstrate the fabrication of graphene-deposited tapered fibers (GDTFs), which can be used as saturable absorbers (SAs) for pulsed lasers. The advantages of GDTF SAs include flexibility, all-fiber configuration, and high optical damage threshold. The fabrication process is based on the interaction of the evanescent field of a tapered fiber with graphene. By in situ monitoring the transmitted power, the deposition process can be controlled, and the GDTF with a desirable level of nonsaturable absorption loss can be fabricated. We also study the dynamic deposition process by employing different waist diameters of tapered fibers and the different deposition powers. The results show that the deposition time can be significantly shortened with stronger evanescent field by decreasing the taper diameter or increasing the deposition power. Furthermore, by exploiting the GDTF as an intracavity passive power modulating element, we demonstrate efficient Q-switched and mode-locked erbium-doped fiber lasers, respectively. © 2012 IEEE.

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