数字签名在伪基站诈骗识别与防范中的应用
作者：
陈欣;刘朔
期刊：
武汉轻工大学学报 ,2017年36(3):63-67 ISSN：2095-7386
作者机构：
武汉轻工大学数学与计算机学院,湖北武汉,430023;[刘朔; 陈欣] 武汉轻工大学
关键词：
信息时代;伪基站;公钥密码;数字签名
摘要：
随着信息和电子技术的发展以及互联网技术的广泛应用,世界已经进入了信息时代. 但是,信息技术在给人们带来极大方便的同时,也存在着巨大的风险.近几年来伪基站诈骗短 信日益猖獗,给人们造成巨大的精神和财产上的损失.本文通过研究短信的正常发送机制和 伪基站的网络接入机制,将基于椭圆曲线公钥密码算法的数字签名机制引入到网络主体身份 鉴别的过程中.通过验证运营商网络的身份,达到识别伪基站从而从根本上拒绝诈骗短信的 目的.
语种：
中文
展开
采用反向变异机制的万有引力搜索算法
作者：
陈欣;刘朔
期刊：
武汉轻工大学学报 ,2016年35(3):60-63,76 ISSN：2095-7386
作者机构：
武汉轻工大学数学与计算机学院,湖北武汉,430023;[刘朔; 陈欣] 武汉轻工大学
关键词：
反向评估机制;变异策略;万有引力搜索算法
摘要：
和许多经典的群智能算法一样,万有引力搜索算法在解决很多优化问题的时候,容易陷入局部最优解并且收敛精度不高。针对这样的情况,提出一种基于变异策略和反向评估机制的改进万有引力搜索算法。该算法通过引入反向评估机制和变异策略,显著地提高了万有引力搜索算法中粒子的局部寻优能力和全局探索能力。通过对三个标准测试函数进行仿真实验,表明其与基本的万有引力搜索算法、传统粒子群算法相比,提出的基于变异策略和反向评估机制的改进万有引力搜索算法在函数优化问题上具有更好的优化性能。
语种：
中文
展开
基于区域均衡和压缩因子的混合粒子群算法的研究
作者：
陈欣;刘朔
期刊：
武汉轻工大学学报 ,2016年35(2):83-86 ISSN：2095-7386
作者机构：
武汉轻工大学数学与计算机学院,湖北武汉,430023;[刘朔; 陈欣] 武汉轻工大学
关键词：
混合粒子群算法;区域均衡;压缩因子
摘要：
针对传统粒子群算法容易陷入局部最优解的问题,提出一种在采用全局最优和区域均衡最优相结合来共同更新粒子速度的基础上,融合压缩因子的混合算法。将粒子的局部区域均衡的信息加入到速度更新公式,使得粒子的速度同时受到全局最优和区域平衡最优的作用,提高了粒子的寻优性能,平衡粒子的全局寻优能力和局部寻优能力。通过选取几个多峰值的测试函数进行仿真实验,表明该算法粒子的寻优性能有较大优势。
语种：
中文
展开
改进蚁群算法在推广运输问题中的应用
作者：
刘朔;陈欣
期刊：
数字技术与应用 ,2016年(11):135-135 ISSN：1007-9416
作者机构：
武汉轻工大学数学与计算机学院 湖北武汉 430000;[刘朔; 陈欣] 武汉轻工大学
关键词：
蚁群算法;运输问题;大规模
摘要：
传统的运输问题是管理运筹学的一个研究重点问题。本文针对现实中粮食收购点向粮食存储仓运输的问题,为提高蚁群算法的效率,提出一种由两边向中间搜索的策略,即在粮食收购点和粮食存储仓分别投放蚁群,任意两只蚂蚁相遇,则对应蚂蚁完成一次路径搜索。这样利用两组蚂蚁的并行性,可以减少算法运行的时间成本,并设计对应的蚁群算法。仿真结果表明,该算法能有效求解问题的最优解。
语种：
中文
展开
Aberration compensation of laser mode unging a novel intra-cavity adaptive optical system
作者：
Li, Jie* ;Chen, Xiqu
期刊：
Optik ,2013年124(3):272-275 ISSN：0030-4026
通讯作者：
Li, Jie
作者机构：
[Li, Jie] Wuhan Polytech Univ, Dept Elect & Informat Engn, Wuhan, Peoples R China.;[Chen, Xiqu] Wuhan Polytech Univ, Dept Math & Phys, Wuhan, Peoples R China.
通讯机构：
[Li, Jie] W;Wuhan Polytech Univ, Dept Elect & Informat Engn, Wuhan, Peoples R China.
关键词：
Aberration compensation;Adaptive optical systems;Closed loops;Control voltages;Deformable mirrors;Distortion effects;Dynamic aberrations;Intracavities;MEMS deformable mirror;Micro mirror;Output power;Thermally induced;Wavefront aberrations;Aberrations;Adaptive optics;Automation;Control;Laser beams;MEMS;Mirrors;Solid state lasers;Optical systems
摘要：
Thermally induced optically distortion effects are one of the main impediments to be overcome in developing high power solid-state lasers. To compensate the dynamic aberration of laser beam, an intra-cavity adaptive optical system was developed. A beaconing light was introduced to measure the wavefront aberration of intracavity laser beam and a MEMS deformable mirror was used to improve the wavefront aberration and output power of the laser. A genetic algorithm was used to adjust the control voltages of 37 independent electrodes to vary the shape of the deformable mirror surface such that the aberration of laser beam can be compensated. The experimental result showed that the output power was increased nearly 3 times and the beam quality was improved obviously by closed loop automatic control of the adaptive optical system. © 2011 Elsevier GmbH.
语种：
英文
展开
一个概率问题的分析及模拟
作者：
易校尉;涂平;陈欣
期刊：
武汉轻工大学学报 ,2013年(2):62-64 ISSN：2095-7386
作者机构：
武汉工业学院数学与计算机学院,湖北武汉,430048;[易校尉; 陈欣; 涂平] 武汉工业学院
关键词：
全概率公式;数学期望;大数定理
摘要：
分析了由算法分析领域提炼出来的一个概率模型，给出了相应随机变量的分布律，进而求出了其数学期望，并通过计算机程序给出了其数学期望的模拟解，验证了通过数学分析得到的结果。
语种：
中文
展开
Responsivity analysis of micro-bolometer under pulsed bias
作者：
Chen, Xiqu* ;Lv, Qiang;Yi, Xinjian
期刊：
Optik ,2011年122(23):2143-2146 ISSN：0030-4026
通讯作者：
Chen, Xiqu
作者机构：
[Lv, Qiang; Chen, Xiqu] Wuhan Polytech Univ, Dept Math & Phys, Wuhan 430023, Hubei, Peoples R China.;[Yi, Xinjian] Huazhong Univ Sci & Technol, Dept Optoelect Engn, Wuhan 430074, Hubei, Peoples R China.;[Yi, Xinjian] Wuhan Natl Lab Optoelect, Wuhan 430074, Peoples R China.
通讯机构：
[Chen, Xiqu] W;Wuhan Polytech Univ, Dept Math & Phys, Wuhan 430023, Hubei, Peoples R China.
关键词：
Integration time;Key factors;Microbolometer;Numerical calculation;Output signal;Pulsed bias;Pulsed voltages;Responsivity;Signal to noise;Thermal model;Voltage bias;Bias voltage;Focusing;Infrared detectors;Signal to noise ratio;Thermography (temperature measurement);Bolometers
摘要：
The physical thermal model for micro-bolometer under pulsed voltage bias is built, and the current responsivity expression of the micro-bolometer based on this physical thermal model is approximatively obtained in theory, which is in accordance with the numerical calculation of micro-bolometer current responsivity. Theoretical analysis shows that the current responsivity parameter is changed with voltage bias time, and this indicates that the current responsivity of micro-bolometer under pulsed voltage bias can be controlled by adjusting useful voltage bias time which is equal to micro-bolometer current integration time. The expression of the current responsivity parameter reveals key factors relevant to the output signal signal-to-noise of micro-bolometric focal plane array, and theoretically gives one of the directions to increase the output signal signal-to-noise of micro-bolometric focal plane array. © 2011 Elsevier GmbH. All rights reserved.
语种：
英文
展开
Theoretical analysis and experimental application of CDS CMOS integrated circuit for uncooled infrared focal plane arrays
作者：
Chen, Xiqu*
期刊：
Optik ,2011年122(9):792-795 ISSN：0030-4026
通讯作者：
Chen, Xiqu
作者机构：
[Chen, Xiqu] Wuhan Polytech Univ, Dept Math & Phys, Wuhan 430023, Peoples R China.
通讯机构：
[Chen, Xiqu] W;Wuhan Polytech Univ, Dept Math & Phys, Wuhan 430023, Peoples R China.
关键词：
CdS;CMOS;Complementary metal oxide semiconductors;Correlated double sampling;Eliminating noise;Experimental application;High noise;Key factors;Low-Frequency Noise;Noise frequencies;Noise source;Readout chips;Readout integrated circuits;Sampling time;Uncooled;Uncooled infrared focal plane array;Uncooled infrared focal plane arrays;Uncooled IRFPA;CMOS integrated circuits;Focal plane arrays;Focusing;Infrared detectors;Integrated circuits;Integration;Lumped parameter networks;Metallic compounds;MOS devices;Readout systems;Electric network analysis
摘要：
In this paper, a typical correlated double sampling (CDS) complementary metal oxide semiconductor (CMOS) circuit for uncooled infrared focal plane array (IRFPA) is theoretically analyzed, the key factor of CDS CMOS integrated circuit is pointed out, and a new CDS integrated circuit which is high correlative for low-frequency noise is applied in an experimental readout chip for uncooled IRFPA. Theoretical analysis indicates that the sample transfer function of a noise source acted on by CDS processing is related to noise frequency and sampling time interval and the key factor of CDS circuit for reducing or eliminating noise in readout integrated circuit is the sampling time interval. The experimental readout chip with high noise-correlative CDS integrated circuit is fabricated to verify the theoretical analysis, which can be applied to uncooled IRFPAs. © 2010 Elsevier GmbH. All rights reserved.
语种：
英文
展开
Optical switch with low-phase transition temperature based on thin nanocrystalline VOx film
作者：
Chen, Xiqu* ;Dai, Jun
期刊：
Optik ,2010年121(16):1529-1533 ISSN：0030-4026
通讯作者：
Chen, Xiqu
作者机构：
[Chen, Xiqu] Wuhan Polytech Univ, Dept Math & Phys, Wuhan 430023, Hubei, Peoples R China.;[Dai, Jun] Huazhong Univ Sci & Technol, Dept Optoelect Engn, Wuhan 430074, Hubei, Peoples R China.;[Dai, Jun] Wuhan Natl Lab Optoelect, Wuhan 430074, Peoples R China.
通讯机构：
[Chen, Xiqu] W;Wuhan Polytech Univ, Dept Math & Phys, Wuhan 430023, Hubei, Peoples R China.
关键词：
Au electrodes;Conducting phase;Electrode layers;Extinction ratios;Metallic phase;Micromachining technologies;Nanocrystalline;Nanocrystalline vanadium oxide;Nanocrystallines;Phase transition temperature;Phase transition temperatures;Power dissipation;Silicon substrates;Switching power supplies;Switching response;Testing results;Vanadium dioxide;Electric power supplies to apparatus;Gold;Nanocrystalline powders;Optical communication;Optical switches;Phase transitions;Power electronics;Superconducting transition temperature;Time switches;Vanadium;Vanadium alloys;Vanadium compounds;Optical films
摘要：
An optical switch is fabricated by using micromachining technology, which is based on thin nanocrystalline vanadium oxide (VO<inf>x</inf>) film, and it consists of four layers: a silicon (Si) substrate layer, a VO<inf>x</inf>layer, a Si<inf>3</inf>N<inf>4</inf>buffer layer, and an aurum (Au) electrode layer. By applying a switching power supply to a pair of the Au electrodes, the optical switch is controlled to exhibit from an "on" state with semi-conducting phase to an "off" state with metallic phase. The optical switch performance is investigated, and testing results show that its extinction ratio is about 14 dB, its switching response time can achieve about 1.5 ms, and the power dissipation required for stimulating switching to work can be below about 15 mW at least, which is lower than the power dissipation of conventional optical switches based on microstructure thin vanadium dioxide (VO<inf>2</inf>) films. This kind of optical switch is potential to be applied as optical switch for optical communication. ©2010 Published by Elsevier GmbH. All rights reserved.
语种：
英文
展开
Phase-shift interferometry combined with surface plasmon resonance effect for two-dimensional bio-surface analysis
作者：
Chen, Xiqu* ;Lv, Qiang
期刊：
Optik ,2010年121(9):818-820 ISSN：0030-4026
通讯作者：
Chen, Xiqu
作者机构：
[Chen, Xiqu] Wuhan Polytech Univ, Dept Math & Phys, Wuhan 430023, Hubei, Peoples R China.;[Lv, Qiang] Huazhong Univ Sci & Technol, Dept Optoelect Engn, Wuhan 430074, Hubei, Peoples R China.;[Lv, Qiang] Natl Lab Photoelect, Wuhan 430074, Peoples R China.
通讯机构：
[Chen, Xiqu] W;Wuhan Polytech Univ, Dept Math & Phys, Wuhan 430023, Hubei, Peoples R China.
关键词：
Imaging sensors;Novel techniques;Optical intensities;Phase shift interferometry;Reflected light;Spatial phase variation;Spatial sensitivity;Surface plasmons;Interferometers;Interferometry;Optoelectronic devices;Phase shift;Plasmons;Surface analysis;Two dimensional;Surface plasmon resonance
摘要：
The phase-shift interferometry combined with surface plasmon resonance (SPR) effect has been studied as a novel technique used to analyze the bio-surface, which measures the spatial phase variation of SPR reflected light. The spatial sensitivity of the SPR imaging sensor is improved over the conventional SPR imaging systems based on optical intensity. Crown Copyright © 2009.
语种：
英文
展开
On Asymptotical Efficiency of Importance Sampling with p-order Relative Moment Minimization
作者：
Gao Quan-sheng;Chen Xin
期刊：
2008 INTERNATIONAL SEMINAR ON FUTURE INFORMATION TECHNOLOGY AND MANAGEMENT ENGINEERING, PROCEEDINGS ,2008年:608-611
作者机构：
[Chen Xin; Gao Quan-sheng] Wuhan Polytech Univ, Dept Math & Phys, Wuhan 430023, Peoples R China.
摘要：
The optimal parameters of candidate measures established by importance sampling are usually obtained by minimizing the quadratic criterion. To begin with, in this paper a scheme is developed for finding the alternative measure that is optimal in the sense that the p-order relative moment is minimized. Secondly, a necessary and sufficient condition for asymptotic efficiency of the optimal change of drift is demonstrated. Lastly, the change of drift is selected through Robbins-Monro type algorithm. When pricing options via Monte Carlo simulations, several numerical examples contrasting different p values that illustrate the efficiency of the proposed method are also included, as well as an interpretation of their different performances in terms of strike prices.
语种：
英文
展开
Design and experimental verification of a readout integrated circuit for uncooled focal plane arrays
作者：
Chen, Xiqu*
期刊：
Optical Engineering ,2008年47(10):104402 ISSN：0091-3286
通讯作者：
Chen, Xiqu
作者机构：
[Chen, Xiqu] Wuhan Polytech Univ, Dept Math & Phys, Wuhan 430023, Peoples R China.
通讯机构：
[Chen, Xiqu] W;Wuhan Polytech Univ, Dept Math & Phys, Wuhan 430023, Peoples R China.
关键词：
CMOS integrated circuits;Dielectric devices;Direct injection;Feedback amplifiers;Focal plane arrays;Focusing;Integrated circuit design;Integrated circuits;Metallic compounds;Metals;MOS devices;Operational amplifiers;Oxide semiconductors;Readout systems;Timing circuits;Transistors;Complementary metal oxide semiconductors;Correlated double sampling;Experimental verification;Integration circuits;Low-power dissipation;Readout integrated circuits;Speed performance;Uncooled focal plane array;Low power electronics
摘要：
A complementary metal oxide semiconductor (CMOS) readout integrated circuit (ROIC) for an uncooled focal plane array (UFPA) is presented. The circuit consists of four major parts: a bolometer current direct injection (BCDI) input circuit, a column-shared capacitor feedback transimpedance amplifier (CTIA) integration circuit, a column-shared correlated double sampling (CDS) circuit, and a common output circuit. By applying the BCDI input circuit and the column-shared integration circuit of CTIA structure, high performance (high gain, a highly stable detector bias, and high photon current injection efficiency) is realized with a small pixel size. Moreover, the CDS circuit is utilized to reduce or eliminate noise of the readout circuit, and the common output circuit is utilized to improve the speed performance of the ROIC under low power dissipation. An experimental readout chip for a 45-μm-pitch 64 x 64 element VO2-based UFPA has been designed and fabricated. The measurement results of the fabricated readout chip at 298 K with 5-V supply voltage have successfully verified the readout function and the performance improvement. The proposed CMOS ROIC can be applied to a micro bolometric UFPA. © 2008 Society of Photo-Optical Instrumentation Engineers.
语种：
英文
展开
