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1. Hash-chain Compressive Sensing for Secure and Efficient Transmission in Wireless Sensor Networks | |||
Liu Liwei,Peng Haipeng,Li Lixiang,Yang Yixian | |||
Electrics, Communication and Autocontrol Technology 11 January 2019 | |||
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Abstract:With the rapid development of the applications of wireless sensor networks (WSNs) in various fields, such as internet of things, military collaborative operations, e-government, telemedicine, etc., the security, the energy-efficiency and the storage-saving are undoubtedly highlighted in the research of WSNs. Compressive sensing (CS) can compress and reconstruct sparse or compressible signals with fewer samples than those of Nyquist-Shannon theorem requires. In order to meet the requirements of storage, energy-efficiency and security of WSNs simultaneously, we propose an efficient and secure transmission model based on compressive sensing and hash-chain theory, which is called hash-chain compressive sensing (HCCS). Compared with the traditional compressive sensing, only the initial key and the hash function are used in the sensor node to decrease the storage space. And the characteristics of hash-chain assure the security of data transmission under HCCS. Furthermore, we propose an image encryption method based on HCCS in order to improve the efficiency and security of image transmission. The security of image signal is greatly improved by adopting the double-encryption mechanism, which uses the measurement matrix $\Phi _1$ and the encryption matrix $\Phi _2$. The numerical experiments are performed to show the feasibility of HCCS and the effectiveness of the proposed image transmission model. | |||
TO cite this article:Liu Liwei,Peng Haipeng,Li Lixiang, et al. Hash-chain Compressive Sensing for Secure and Efficient Transmission in Wireless Sensor Networks[OL].[11 January 2019] http://en.paper.edu.cn/en_releasepaper/content/4747004 |
2. Efficient Method for Localization of Mixed Far-Field and Near-Field Signals | |||
ZUO Weiliang,XIN Jingmin | |||
Electrics, Communication and Autocontrol Technology 29 June 2017 | |||
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Abstract:In this paper, we deal with the problem of localizing mixed far-field (FF)and near-field (NF) sources impinging on a uniform linear arraywith the symmetrical geometric configuration.An efficient method for localization of the mixed FF and NF sources is proposed,where the direction-of-arrivals (DOAs) of the mixed sources are estimated separately by using the oblique projection,and then the ranges of the NF sources are obtained through a polynomial rooting,while the computationally burdensome eigendecomposition and pair-matching are avoided.The effectiveness of the proposed method is verified through numerical examples,and the simulation results show that the proposed method has better estimation performancethan some existing methods. | |||
TO cite this article:ZUO Weiliang,XIN Jingmin. Efficient Method for Localization of Mixed Far-Field and Near-Field Signals[OL].[29 June 2017] http://en.paper.edu.cn/en_releasepaper/content/4738008 |
3. Dynamic output feedback control for stochastic networked control systems based on periodic event-triggered mechanism | |||
Mali Xing, Feiqi Deng | |||
Electrics, Communication and Autocontrol Technology 15 December 2016 | |||
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Abstract:In this paper, the event-triggered dynamic output feedback control for stochastic networked control system is investigated. The measurement output signal is periodically sampled but aperiodically transmitted. Under the periodic event-triggered mechanism, both impulsive system method and time-delay system method are utilized to model the stochastic networked control system, then the corresponding stability criteria are obtained. Based on the stability criteria, the suitable output-based controller and event-triggered parameters are co-designed. An air vehicle system is presented to illustrate the efficiency of the proposed control method. | |||
TO cite this article:Mali Xing, Feiqi Deng. Dynamic output feedback control for stochastic networked control systems based on periodic event-triggered mechanism[OL].[15 December 2016] http://en.paper.edu.cn/en_releasepaper/content/4713609 |
4. 157km BOTDA with pulse coding and image processing | |||
Qian Xianyang,Wang Zinan,Wang Song,Xue Naitian,Sun Wei,Zhang Li,Zhang Bin,Rao Yunjiang | |||
Electrics, Communication and Autocontrol Technology 21 May 2016 | |||
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Abstract:A repeater-less Brillouin optical time-domain analyzer (BOTDA) with 157.68km sensing range is demonstrated, using the combination of random fiber laser Raman pumping and low-noise laser-diode-Raman pumping. With optical pulse coding (OPC) and Non Local Means (NLM) image processing, temperature sensing with ±0.70 C uncertainty and 8m spatial resolution is experimentally demonstrated. The image processing approach has been proved to be compatible with OPC, and it further increases the figure-of-merit (FoM) of the system by 57%. | |||
TO cite this article:Qian Xianyang,Wang Zinan,Wang Song, et al. 157km BOTDA with pulse coding and image processing[OL].[21 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4691799 |
5. Polarization-driven internal modulation of the forward-pumped random fiber laser | |||
Wu Han,Wang Zinan,Fan Mengqiu,Li Yunqi,Zhang Li,Li Yi,Rao Yunjiang | |||
Electrics, Communication and Autocontrol Technology 05 May 2016 | |||
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Abstract:In this letter, we experimentally demonstrate the polarization-driven internal modulation of the forward-pumped random fiber laser (RFL). The output power of the random lasing is found to be sensitive to the state of polarization (SOP) of the Stokes light in the loop mirror. By inserting the polarization switch (PSW) driven by the TTL signal in the loop mirror, the SOP of the Stokes light can be switched between two states, thus the lasing output can be modulated as the pulsed signal with high extinction ratio. | |||
TO cite this article:Wu Han,Wang Zinan,Fan Mengqiu, et al. Polarization-driven internal modulation of the forward-pumped random fiber laser[OL].[ 5 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4686929 |
6. Role of linewidth enhancement factor on time-delay signature concealment of chaos in mutually-coupled semiconductor ring lasers | |||
LI Jiafu,XIANG Shuiying,ZHANG Hao,GUO Xingxing | |||
Electrics, Communication and Autocontrol Technology 18 April 2016 | |||
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Abstract:The time-delay signature (TDS) properties in chaotic semiconductor ring lasers (SRLs) with mutual injection are investigated numerically. The TDS is quantified via auto-correlation function. We numerically investigate the influence of linewidth enhancement factor α on the TDS. The results show that the TDS can be efficiently concealed when the linewidth enhancement factor of SRLs is large enough, and much larger ranges of operation parameters can be continuously adjusted. Hence, for practical applications, by simply choosing mutually-coupled SRLs with larger linewidth factors, four sets of widely tunable chaos with TDS concealment can be simultaneously achieved, which is highly desirable for high speed random number generation and optical chaotic encryption system based on chaotic SRLs. | |||
TO cite this article:LI Jiafu,XIANG Shuiying,ZHANG Hao, et al. Role of linewidth enhancement factor on time-delay signature concealment of chaos in mutually-coupled semiconductor ring lasers[OL].[18 April 2016] http://en.paper.edu.cn/en_releasepaper/content/4684599 |
7. Supercapacitors based sheet-structure polyprrole/grpahene composites | |||
Zhu Jianbo,Xu Youlong,Wang Jie | |||
Electrics, Communication and Autocontrol Technology 05 December 2015 | |||
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Abstract:Nano-sheet polypyrrole/reduced graphene oxide (PPy/RGO) composites were prepared by in situ polymerization of the pyrrole monomer in the RGO uniform suspension. A homogeneous dispersion of individual graphene sheets coated by the PPy matrix was achieved. PPy and RGO formed a nano-sheets structure composite. Such nano-sheeets structure and the observed high electrical conductivities afforded high specific capacitance, good rate performance and cyclic stability. A high specific capacitance of 255.7 F g-1 was achieved for PPy/RGO-10. Furthermore, The PPy/RGO-10 electrodes have good cycle stability and show less than 8.5% specific capacitance decay at a charge/discharge current density of 2 A g-1 within an electrochemical window of 0.9 V after 2000 cycles. | |||
TO cite this article:Zhu Jianbo,Xu Youlong,Wang Jie. Supercapacitors based sheet-structure polyprrole/grpahene composites[OL].[ 5 December 2015] http://en.paper.edu.cn/en_releasepaper/content/4669401 |
8. Integrated Raman Spectroscopic Sensor Based on Silicon Nanowire Waveguides | |||
Xianxin Jiang,Longhua Tang,Jinyan Song,Mingyu Li,Jian-jun He | |||
Electrics, Communication and Autocontrol Technology 04 December 2015 | |||
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Abstract:In this article we propose a novel Raman spectroscopic sensor which employs silicon nanowire waveguides for excitation and collection of Raman signal, and an integrated micro-ring resonator as a filter. Preliminary experimental results show that the extinction ratio of the filter including the ring resonator together with the grating coupler is more than 60 dB and the total insertion loss from the laser to the detector is less than 10dB. Theoretical calculations indicate that this high stray light rejection of the filter allows the observation of Raman signal at frequency as low as 4 cm-1. By employing the evanescent field of the silicon waveguide as excitation and collection of Raman signal, along with the integration of the filter and potentially a tunable semiconductor laser and the detector, a miniaturized Raman spectroscopic sensor can be realized on SOI platform. | |||
TO cite this article:Xianxin Jiang,Longhua Tang,Jinyan Song, et al. Integrated Raman Spectroscopic Sensor Based on Silicon Nanowire Waveguides[OL].[ 4 December 2015] http://en.paper.edu.cn/en_releasepaper/content/4668954 |
9. Hybrid plasmonic ring resonator at deep subwavelength scale in the visible spectrum | |||
Feifei Shi,Xin Gong,Jie Zhou,Zhaoyu Zhang | |||
Electrics, Communication and Autocontrol Technology 16 April 2015 | |||
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Abstract:In the past decade, plasmonic resonators have emerged and exploited field compression to create ultra-small mode-volume devices and to enhance light-matter interactions. We propose a ring resonator on metal substrate separated by low-permittivity dielectric, which supports hybrid plasmonic modes with highly localized electromagnetic ?eld. Finite difference time domain (FDTD) method is used to calculate the properties of the ring resonator. By changing the cavity's geometry and low-permittivity dielectric's height, high quality factor of 354 along with ultra-compact mode confinement 0.0078 (λ/2n)3 ~ 0.0001um3 is achieved, leading to Purcell factor up to 2.7 x 104. Moreover, the mode volume remains of the order of 0.01(λ/2n)3 with quality factor bigger than 100 for a ring radius and thickness in the range of nanometers. The hybrid plasmonic ring resonator exhibits a trade-off between the high quality factor and the ultra-small mode volume at deep subwavelength scale in the visible spectrum. It holds great potential in fundamental physics and applications in photonics and optoelectronics, for instance, cavity quantum electrodynamics in weak coupling regime and low-threshold lasers. | |||
TO cite this article:Feifei Shi,Xin Gong,Jie Zhou, et al. Hybrid plasmonic ring resonator at deep subwavelength scale in the visible spectrum[OL].[16 April 2015] http://en.paper.edu.cn/en_releasepaper/content/4639035 |
10. Hybrid Plasmonic Whispering-gallery-mode Ring Resonator at NanoScales | |||
Feifei Shi,Jie Zhou,Zhaoyu Zhang | |||
Electrics, Communication and Autocontrol Technology 07 April 2015 | |||
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Abstract:a plasmonic whispering-gallery-mode cavity comprising of a semiconductor ring separated from a metal surface by a nanoscale dielectric gap is proposed and numerically investigated. The nanoscale ring resonator supports hybrid plasmonic modes with highly localized electromagnetic fields, featuring an ultra-small mode volume ~0.00129 μm3. The total quality factor is found to be limited by two mechanisms, the metal radiation loss and the absorption loss, and exhibits a tradeoff with the mode volume. | |||
TO cite this article:Feifei Shi,Jie Zhou,Zhaoyu Zhang. Hybrid Plasmonic Whispering-gallery-mode Ring Resonator at NanoScales[OL].[ 7 April 2015] http://en.paper.edu.cn/en_releasepaper/content/4638049 |
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