杜鹃鸟搜索算法优化最小二乘支持向量机的网络入侵检测模型

为了提高网络入侵检测率,提出一种改进杜鹃鸟搜索（MCS）算法优化最小二乘支持向量机（LSSVM ）的入侵检测模型（MCS-LSSVM ）。首先将LSSVM 的参数作为杜鹃鸟的鸟巢位置,然后通过模拟杜鹃鸟种群寄生繁衍机制,找到鸟巢最优位置,并转化成LSSVM 最优参数,最后采用最优参数建立最优建立入侵检测模型,并采用KDD CUP 99数据集进行仿真测试。仿真结果表明,MCS-LSSVM 不仅提高了网络入侵的检测率,而且减少了训练时间,提高网络入侵检测效果。     

杂草算法优化支持向量机的网络入侵检测

为了解决支持向量机(优化SVM)在网络入侵检测中的参数优化问题,以提高网络入侵检测性能,提出一种入侵杂草(IWO)算法SVM的网络入侵检测模型(IWO-SVM)。首先将SVM参数编码为入侵杂草,以检测率作为优化目标函数,然后通过模拟杂草入侵种子的生长过程找到最SVM的最优参数,从而最优网络入侵检测模型,后在采用KDD99数据集性能测试。结果表明IWO-SVM是一种检测检测率高、速度快的网络入侵检测模型。     

AFSA-BPNN在网络安全中的应用研究

为了有效地检测网络入侵行为,提出一种人工鱼群(AFSA)算法优化BP神经网络(BPNN)入侵检测模型。首先将BP神经网络的权值和阈值编码为AFSA的人工鱼状态,然后通过人工鱼群觅食、聚群、追尾等行为,对BP神经网络的参数进行优化,寻找到BP神经网络的最优参数,最后利用建立的最优BP神经网络模型,对网络入侵行为进行检测。在Windows XP操作系统,Matlab 2012平台上,采用KDD CUP 99数据集仿真测试,相对于传统的BP神经网络模型,本文模型可以显著提高网络入侵检测正确率,有着更加广泛的应用前景。     

改进布谷鸟算法优化极限学习机的网络入侵检测

为了保证网络的安全,针对极限学习机在网络入侵检测过程中参数优化的难题,提出一种改进布谷鸟搜索算法优化极限学习机的网络入侵检测模型。首先将极限学习机参数编码为布谷鸟巢位置,并以网络入侵检测正确率作为ELM参数优化目标,然后通过模拟布谷鸟繁育行为找到极限学习机的最优参数,建立网络入侵检测分类器,最后在Matlab 2012平台上采用KDD99数据集进行仿真实验。结果表明,MCS-ELM提高了网络入侵检测正确率,可以满足网络入侵检测在线检测要求。     

基于特征优化的网络入侵检测模型设计

为了克服当前网络入侵检测模型存在的局限性,以获得更加理想的网络入侵检测结果,设计基于特征优化的网络入侵检测模型。首先研究当前网络入侵检测建模现状,分析特征对网络入侵检测结果的影响,然后建立网络入侵检测的特征优化数学模型,通过模拟自然界生物进化的自适应遗传算法对特征优化数学模型的解进行搜索,对最优解反编码得到入侵检测的最优特征子集,最后根据最优特征子集对网络入侵检测的学习样本进行建模,设计最优的网络入侵检测模型。采用网络入侵检测的标准数据集进行仿真对比测试,文中模型的网络入侵检测平均正确率大约为95%,而当前其他网络入侵检测模型均在95%以下,同时该模型的入侵检测建模训练和检测时间大幅度减少,能够获得更优的网络入侵检测效率。     

蚁群算法选择神经网络参数的网络入侵检测

入侵检测是保证网络安全的关键技术,为了解决神经网络在入侵检测应用中的参数优化难题,提出蚁群算法选择神经网络参数的网络入侵检测模型。首先描述蚁群算法与神经网络参数之间的联系,并建立神经网络参数选择的目标函数,然后采用蚁群算法对目标函数的最优解进行搜索,确定神经网络的最佳参数,最后通过神经网络自组织学习实现入侵检测分类器的构建,选择入侵检测标准数据在Matlab 2014平台上实现仿真实验。结果表明,该模型解决了神经网络在入侵检测中的参数优化难题,建立了综合性能良好的入侵检测分类器,分类结果和分类速度均比典型模型有较显著的优势。     

人工蜂群优化支持向量机算法在网络安全中的应用

针对支持向量机(SVM)性能的影响,探讨了人工蜂群算法(ABC)对SVM参数优化方法,建立了SVM参数优化模型,并将其用于网络安全中的网络入侵模型中.采用KDD 1999数据集进行仿真实验,验证了方法的有效性,结果表明,与遗传算法等传统优化算法相比,ABC优化的SVM有效地降低运行时间,可以获得更高的网络入侵检测率.     

基于LSSVM的六价铬含量预测模型

设计一种六价铬自动测量系统,为提高测量的准确度,使用最小二乘支持向量机(LSSVM)算法建立预测模型,并使用混合蛙跳算法优化LSSVM算法的参数,可避免算法收敛于局部最优,增强算法的泛化能力,减少算法对异常样本的预测偏差,提高精度。通过对神经网络模型及LSSVM模型进行仿真对比,结果显示LSSVM模型的六价铬含量预测误差更小。     

蚁群算法选择神经网络参数的网络入侵检测

为了解决网络入侵检测率低的难题,提出蚁群算法选择神经网络参数的网络入侵检测模型(ACO-NN)。首先收集网络入侵检测数据,然后采用神经网络对入侵检测数据进行学习,通过蚁群算法解决神经网络参数选择问题,最后采用标准入侵检测数据进行验证性测试,并与其他模型进行对比分析。结果表明,所提模型解决了神经网络参数优化难题,降低了网络入侵检测的错误率,改善了网络入侵检测的正确率,有助于保证网络的安全性。     

改进帝王蝶算法在工业入侵检测技术中的应用

针对神经网络训练时容易陷入局部最优的问题,提出一种基于工业入侵检测模型的帝王蝶优化算法。利用帝王蝶算法(monarch butterfl y optimization, MBO)和狮群进化算法(lion pride optimization, LPO)的全局寻优和局部寻优提高网络参数的求解质量,从而提高入侵检测结果的准确率。实验在工业控制系统标准数据集进行评估,结果表明模型符合工业入侵检测标准,与其它流行算法相比较,优化后的工业入侵检测技术具有较高的检测精度和较快的收敛速度。     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.