基于遗传算法的试题库组卷研究

组卷问题是一个多重优化约束目标求解问题,使用传统方法解决此种问题较困难,考试题库以及组卷算法的设计决定了组卷的效率和质量。文中提出一种基于遗传算法的组卷方法,给出了初始种群方法,分段编码及交叉算子、变异算子,优化了搜索过程,实验证明求解组卷问题采用该方法行之有效,有利于实现考试的规范化、科学化、教考分离。     

基于改进遗传算法的试卷生成算法研究

针对应用传统遗传算法在组卷中出现的早熟和收敛速度慢等问题,提出基于改进遗传算法的试卷生成算法。详细介绍改进的遗传算法应用于组卷的步骤,包括编码方法、适应度函数、交叉算子和变异算子的确定等关键内容。该算法采用分组自然数形式进行个体编码,同时,一改传统交叉方法,采用自适应交叉概率和遗传概率的方法进行运算。仿真实验表明,该算法有效提高了组卷的效率。     

用遗传算法求解时间表问题

通过对时间表问题的认识,设计了求解该问题的遗传算法,给出了矩阵编码,和针对矩阵行,列操作的遗传算子,并给出了一个实例。     

基于改进遗传算法的自动组卷问题研究

为了解决传统遗传算法在自动组卷中容易出现未成熟收敛和收敛速度慢等问题,提出了一种基于改进遗传算法的自动组卷方法。采用分段二进制编码策略,对每个子空间进行初始种群选择,保证了初始种群舍有丰富的模式,从而增加搜索收敛于全局最优的可能性。并对交叉算子和变异算子进行了优化,实现了交叉和变异概率随解的变化而自适应调整。实验结果表明,改进的遗传算法能有效地解决自动组卷问题,提高了收敛速度和组卷的成功率。     

自适应混合遗传算法在弹药装载中的应用研究

多约束条件下的弹药装载问题是一个复杂的组合优化问题,属于NP 完全问题,其求解是很困难的。本文在考虑弹药装载中各类约束条件的情况下,对简单遗传算法进行了多方面改进,提出了一种自适应混合遗传算法,来求解弹药装载问题。本文对该算法的编码和解码过程,以及复制算子、交叉算子和变异算子的构建,进行了详细的阐述,给出了使用该算法求解弹药装载问题的具体实现方法。     

基于遗传算法的自动组卷策略

自动组卷是一个多约束条件的最优求解问题,传统组卷算法存在速度慢、成功率低、组卷质量不高等不足,已不符合现行要求。为此,文中采用整段交叉,段内变异的方法,通过确定适应度函数和遗传算子探索了遗传算法在自动组卷中的应用,在一定程度上克服了已有算法的不足,并用算例验证了其有效性及适用性。     

基于改进遗传算法的组卷策略与实现

为了更好地解决组卷质量和组卷速度之间的矛盾，文章提出了一种基于改进遗传算法的组卷策略．对遗传算法的个体编码、初始种群、杂交运算进行改进。实验结果表明，该算法提高了组卷速度，具有较好的实用性。     

基于遗传算法的智能组卷方案研究

组卷问题是一个多目标约束优化问题，为了快速组成难度呈正态分布的高质量试卷，就必须降低约束目标。文章提出一种基于遗传算法的智能组卷方案，采用十进制分段编码，改进了传统的初始化种群方法，优化了搜索过程。实验证明该方案具有较好的性能和实用性。     

浅层地下震动定位方法研究

提出一种利用改进遗传算法解决浅层地下震动定位的问题,模拟时差定位模型进行震源坐标的求解,由于模型的复杂性,采用了浮点数编码的遗传算法,引入一种自适应的交叉算子和变异算子。实验结果表明,在保证种群数量的情况下,该算法性能大大优于一般遗传算法,能快速找到逼近全局最优的解,并且精度更高。     

机器组卷问题的遗传-蚂蚁算法研究

计算机智能组卷的关键技术在于组卷算法，蚂蚁算法在初期信息素缺乏导致搜索时间较长；遗传算法需要在一组解中寻找最优解而产生大量的重复数据，导致算法效率较低。为了开发出一个具有高效性和鲁棒性的组卷算法，提出了一种融合遗传算法与蚂蚁算法的机器组卷算法，算法利用遗传算子操作的全局收敛快的特点，将最优结果作为蚂蚁算法的初始信息素分布，按照蚂蚁算法的并行反馈信息、求解效率高的特点进行信息更新求得最优解，优势互补。实验表明，算法在收敛性和寻优性都有很好的效果。     

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.     

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.     

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.     

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.     

Curved crystal spectrometer for the measurement of X-ray lines from laser-produced plasmas

In order to diagnose the laser-produced plasmas, a focusing curved crystal spectrometer has been developed for measuring the X-ray lines radiated from a laser-produced plasmas. The design is based on the fact that the ray emitted from a source located at one focus of an ellipse will converge on the other focus by the reflection of the elliptical surface. The focal length and the eccentricity of the ellipse are 1350 mm and 0.9586, respectively. The spectrometer can be used to measure the X- ray lines in the wavelength range of 0.2-0.37 nm, and a LiF crystal （200） （2d = 0.4027 nm） is used as dispersive element covering Bragg angle from 30° to 67.5°. The spectrometer was tested on Shengnang- Ⅱ which can deliver laser energy of 60-80 J/pulse and the laser wavelength is 0.35 μm. Photographs of spectra including the 1 s2p ^1P1-1s^2 ^1S0 resonance line（w）, the 1s2p ^3P2-1s^2 1S0 magnetic quadrupole line（x）, the 1s2p ^3P1-1 s^2 ^1S0 intercombination lines（y）, the 1 s2p ^3S~1-1 s^2 ^1S0 forbidden line（z） in helium-like Ti Ⅹ Ⅺ and the 1 s2s2p ^2P3/2-1 s622s ^2S1/2 line（q） in lithium-like Ti Ⅹ Ⅹhave been recorded with a X-ray CCD camera. The experimental result shows that the wavelength resolution（λ/△ 2） is above 1000 and the elliptical crystal spectrometer is suitable for X-ray spectroscopy.     

Preparation and Characterization of TaN ALD Precursors

High purity organic-tantalum precursors for thin film ALD TaN were synthesized and characterized.Vapor pressure and thermal stability of these precursors were studied.From the vapor pressure analysis,it was found that TBTEMT has a higher vapor pressure than any other published liquid TaN precursor,including TBTDET,TAITMATA,and IPTDET.Thermal stability of the alkyl groups on the precursors was investigated using a 1H NMR technique.The results indicated that the tertbutylimino group is the most stable group on TBTDET and TBTEMT as compared to the dialkylamido groups.Thermal stability of TaN precursors decreased in the following order:TBTDET ＞ PDMAT ＞ TBTEMT.In conclusion,precursor vapor pressure and thermal stability were tuned by making slight variations in the ligand sphere around the metal center.     

Electronic Structure of Semiconductor Nanocrystals

This paper reviews our recent development of the use of the large-scale pseudopotential method to calculate the electronic structure of semiconductor nanocrystals, such as quantum dots and wires, which often contain tens of thousands of atoms. The calculated size-dependent exciton energies and absorption spectra of quantum dots and wires are in good agreement with experiments. We show that the electronic structure of a nanocrystal can be tuned not only by its size,but also by its shape. Finally,we show that defect properties in quantum dots can be significantly different from those in bulk semiconductors.     

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.     

Critical Stage Rule-Based Real Time Dispatch（RTD）System in Highly-Mixed-Products （HMP） FAB

An improving utilization and efficiency of critical equipments in semiconductor wafer fabrication facilities are concerned. Semiconductor manufacturing FAB is one of the most complicated and cost sensitive environments. A good dispatching tool will make big difference in equipment utilization and FAB output as a whole. The equipment in this paper is In-Line DUV Scanner. There are many factors impacting utilization and output on this equipment group. In HMP environment one of the issues is changing of reticule in this area and idle counts due to load unbalance between equipments. Here we'll introduce a rule-based RTD system which aiming at decreasing the number of recipe change and idle counts among a group of scanner equipment in a high-mixed-products FAB.     

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.