基于自适应节点选择蚁群算法的QoS选播路由算法

针对基本蚁群算法在求解QoS选播路由问题中存在的容易陷入局部最优和收敛速度慢的缺陷,提出一种基于自适应节点选择的蚁群算法对该问题进行求解.该算法根据解的情况自适应调整节点选择策略;依据各路径上信息素的＂集中＂程度判断解的早熟、停滞情况,并对可能陷入局部最优的解进行信息素混沌扰动更新,以便跳出局部极值区间.仿真实验表明,算法全局搜索能力较强,能够跳出局部极值区间,快速地收敛到全局最优解,算法是可行、有效的.     

基于蚁群算法的仿射变换参数求解

仿射变换参数估计是图像配准的基于蚁群算法的仿射变换参数估计方法,针对蚁群算法求解多维连续优化问题的不足,将仿射变换参数空间划分成若干子域,改进蚁群的搜索方法和信息素更新方法,快速搜索全局最优解,实验结果表明,该算法能够有效地估计仿射变换参数.     

基于拥挤度因子的动态信息素更新策略蚁群算法

针对蚁群算法易陷入局部最优、收敛速度慢的问题,文中提出了一种基于拥挤度因子的动态信息素更新策略的蚁群算法(CFACS)。引入鱼群算法中拥挤度的思想,扩大种群中蚂蚁分布范围,使其探索更大的解空间,提高算法全局搜索能力;采用动态信息素更新策略,在每一次迭代中,自适应调整当前最优路径所释放的信息素浓度,保证蚁群前期的多样性,同时保证算法在后期的收敛性。求解TSP问题的仿真实验表明,改进算法求得解的质量和求解的收敛速度都明显优于传统蚁群算法,较好地平衡了种群多样性与收敛速度之间的矛盾。     

蚁群算法在求解TSP问题中的改进研究

针对蚁群算法在求解大规模优化问题时存在的3个缺点：消耗时间长、蚂蚁在下次搜索时目标导向不强导致搜索随机性大、寻优路径上的信息素过度增强导致得到假的最优解。本文提出了基于边缘初始化和自适应全局信息素的改进蚁群算法。在相同参数下,其搜索时间大大缩短,并且得到了更好的最优解。将其应用到旅行商（TSP）问题中,和基本蚁群算法、遗传算法相比较,其具有以下优点：较好的搜索最优解的能力;对新解不会过早的终止;探索新解的能力进一步增强。因此,改进的蚁群算法在求解TSP等组合优化问题时非常有效。     

一种求解连续空间优化问题的动态蚁群算法

在实现了连续蚁群算法的基础上,针对蚁群算法容易陷入局部最优解的问题,对连续蚁群算法的全局转移概率进行改进,提出一种动态蚁群算法(DACO),根据动态全局转移概率分配蚂蚁个数,进行不同阶段的搜索.仿真实验表明,动态蚁群算法能够得到更精确的解.     

一种求解连续对象优化问题的改进蚁群算法

蚁群算法在搜索过程中容易陷入局部最优解，且不适用于连续对象优化问题。文章针对这些问题．采用信息量变异、引入微粒群操作等方法进行改进，提出了一种引入微粒群操作的改进蚁群算法，并应用于求解连续对象优化问题。对几个典型复杂连续函数优化问题的测试研究表明，该改进算法不仅跳出局部最优解的能力更强．而且能较快地收敛到全局最优解，表明了算法的有效性。     

基于蚁群优化算法的多QoS选播路由算法研究

提出一种基于蚁群优化算法的多QoS选播路由算法.算法设计了合理的路径评价方法,从平衡网络负载的角度出发,寻找适当的选播路由路径.通过对迭代最优解路径上的信息素的调整和算法重启的策略,算法有效地避免了陷入局部最优的缺陷,扩大了算法的搜索范围.实验结果表明,该算法能找到满足QoS约束的全局最优解,并在资源预留的基础上较好地满足用户对于带宽、时延的要求.     

优化蚁群算法在网络知识路由系统中的应用

研究网络知识路由问题,提高网络资源搜索质量。针对传统方法在网络资源搜索过程中,存在搜索时间长,得不到最优解,导致搜索速度慢,效率低的问题。为了提高网络资源搜索效率,提出一种基于改进蚁群的路径搜索算法,在混合信息素更新策略,自适应挥发因子等方面进行改进,并设置了先行蚂蚁和后行蚂蚁。该方法有效地避免了蚁群搜索陷入局部最优,加快了收敛,提高了搜索效率。仿真结果表明,改进方法缩短了搜索时间,网络资源搜索效率明显提高,证明是一种有效的优化方法,能够在最短时间找到资源搜索的最优解,是解决网络资源搜索优化问题的有效算法。     

同型机调度问题的混合ACO-SA优化算法研究

针对同型机调度问题,提出一种蚁群-模拟退火两阶段优化算法.构造了问题域蚁群模型,运用蚁群算法展开全局搜索,通过自适应调整闻值改善空间探索与局部开采的平衡;为提高搜索精度,引入模拟退火算法,将蚁群算法的最好解作为其初始解,在邻域内进行精细搜索,利用其概率突跳特性有效避免算法陷入局部最优.实验结果表明混合算法具有稳定而优良的寻优能力.     

禁忌粒子群算法在几何约束求解中的应用

约束问题可以转化为优化问题,针对粒子群优化算法在算法的后期易陷入局部最优的缺点,提出TPSO(禁忌粒子群优化算法),在算法的前期采用粒子群算法快速产生全局最优解信息素的初始分布,后期引入禁忌搜索算法,记录已经达到的局部最优解,在下一次搜索中,不再或者有选择地搜索这些点,从而跳出局部最优点,并且在搜索过程中允许接受劣解,充分利用禁忌搜索的记忆能力及较强的爬山能力,大大提高了获得全局最优解的概率.该算法综合了粒子群优化算法的快速性,随机性和全局收敛性以及禁忌搜索局部寻优的能力.在确保全局收敛性的基础上,能够快速搜索到高质量的优化解.该方法用于几何约束求解的性能明显高于标准粒子群算法,算法具有良好的优化性能和时间性能.     

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.     

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.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks