Position Adaptive Measurement Model for Double-four Quadrant Photoelectric Detector

A modeling method of the support vector machine combined with matrix optics is considered; a complete new measurement model for double-four quadrant photoelectric detector is built. According to the analysis of the received light spot size and its motion with the changes of the defocusing amount of detector photosensitive surface and the detector position attitude in the optical path, a mathematic expression of photoelectrical conversion is given, which can be applicable to random setting position of the detector at any time. Based on least square support vector machine （LS SVM）, the mapping relationship among the output signal linear characteristic parameters （zero neighborhood gradient and intercept）, the defocusing amount of the detector and the installation position attitude angle is established. Thus, the multiple dimensional high accuracy measuring and adjusting control system can be left out, and adaptive measurement of the detector parameters can be realized. Compared with existed measurement model and method, the presented model has the advantages of more clear physical meaning, closer to work mechanism of detector, acquiring more complete sample data and wiping out the dead spots or bad spots in measurement. And the accuracy of displacement measurement is increased to 3μm. At the same time, this measurement mode provides a technical shortcut for three-dimensional small angle measurement.     

自适应递推最小二乘灰色均衡器用于时变信道

本文提出了适用于时变信道的自适应递推最小二乘灰色均衡的新思想，以收敛性比较。最小二乘灰色均衡器优于传统的最小二乘均衡器，而以时变信道上的误码率来看，其性能是盲均衡器盲均衡所不能比拟的，而且也优于传统的均衡器，理论分析及计算机模拟表明，自适应最小二乘灰色均衡器是时变信道上性能优良的均衡。     

微机控制自动调谐的NYAB自倍频激光器的研究

研制出国内第一台微机控制自动调谐的LD泵浦NYAB自倍频激光器。利用计算机控制激光器输出镜作二维扫描,精度达10~(-2)度的量级。激光器产生0.531μm的线偏振绿色激光,基横模运转,阈值泵浦功率为14mW,输出功率达3.6mW,斜效率达3％,偏振度大于99.8％。     

Peer-to-Peer计算模型及其安全对策

介绍了P2P的定义，分析了当前P2P的五个模型的工作原理以及带来的影响，概括了P2P的特性，比较了P2P与传统Client/Server模型的区别，针对P2P技术带来的网络安全挑战，提出了解决P2P网络安全的对策,着重对如何从信息安全的角度利用基于Agent的自适应技术监测Internet环境中P2P模式下的信息传播进行了探讨。     

高集成度H.261全数字化视频编解码系统的设计

介绍一个自行设计和研制的基于Ｈ．２６１的全数字化视频编解码系统。该系统采用了视频专用芯片、中规模ＰＬＤ芯片、虚拟缓存器控制策略，设计规模小，功能强，工作可靠，图象质量和视觉效果优良，可以方便地应用于数字视频领域中的各种场合。     

自适应调制与编码系统及其在WCDMA中的应用

本文主要讨论自适应调制与编码系统(Adaptive Modulation and Coding system）的原理，介绍AMCS实现的几个关键技术，包括RCPT（速率适配凿孔turbo）码、高阶调制、H-ARQ和MIMO（多输入多输出）系统。介绍了在WCDMA的高速下行分组接入业务（HSDPA）中使用的自适应调制编码机制，并讨论了可能增加的设备复杂度。     

On continuity properties of the two-block ℓ1 optimal design

This paper investigates continuity properties of the two-block ℓ₁ optimization resulting from the optimal design of BIBO stability robustness for discrete time systems in the presence of coprime factor perturbations. In general, the two-block ℓ₁ optimal design might lack continuity properties, since it might have no finite dimensional solution. However, this paper shows that for a suitable given truncated order, the two-block ℓ₁ suboptimal design is continuous as a map from the plant to the suboptimal closed loop solution, if the plant has no zeros on the unit circle and has a unique suboptimal solution. Furthermore, if the set of plants is compactness, we show that there exists a uniform bound on the degree of suboptimal solution for all plants in the set such that their deviation of suboptimal value from the optimal one have the same bound, and the two-block ℓ₁ suboptimal design is uniformly continuous. In particular, in the case in which the plant has nonunique solution, a procedure is also developed on how to choose a solution that preserves continuity. The results enable the stability of robust ℓ₁ adaptive scheme to hold in the presence of coprime factor perturbations.     

Adaptive statistical algorithms in network reliability analysis

The paper is concerned with introducing novel algorithms, such as adaptive approximation and deterministic radial basis function (RBF) method, for calculating the average loss (AL). Different approximators are trained to approximate the loss function and, after a short learning period, AL can be evaluated analytically with fast calculations. An improvement of the Li–Silvester (LS) method is also presented which yields a sharper lower bound on AL. The efficiency of the new methods are proven by theoretical analysis as well as demonstrated by excessive simulations.     

Adaptive linear quadratic gaussian (LQG) control of a bioreactor

The paper deals with the modelling and adaptive control of a continuous-flow fermentation process for the production of alcohol. The fermenter model has been developed from mass balance and leads to nonlinear differential equations. In practice, control strategies are difficult to derive using this non-linear model. The dilution rate and the substrate concentration have been considered as control and controlled variables, respectively. The adaptive control algorithm implemented is based on the linear quadratic control approach, where the associated Riccati equation is iterated until the system closed-loop poles belong to a restricted stability domain which is included in the unit circle. A single input/output model is used for control purposes. The model parameters are estimated on-line using a robust identification algorithm which includes: data normalization, time-varying forgetting factor, covariance matrix factorization, etc. Experimental results show the performance of this adaptive scheme and its ability to control biotechnological processes.     

基于倒谱的非最小相位FIR系统自适应辨识

本文介绍了一种在高阶谱一维切片的基础上利用倒谱进行非最小相位FIR系统自适应辨识的算法。这一算法具有计算量小，不需要预先假定系统阶次的特点，而且能够自适应地分别辨识出非最小相位FIR系统的最小相位部分和最大相位部分的冲激响应，同时，系统阶次可以在自适应过程中确定。另外由于本算法利用观测信号的高阶级计量进行系统辨识，所以很好地抑制了高斯有色噪声对辨识结果的影响。数值仿真结果证明了本算法的有效性。