Abstract:A method taking multi-samples as sub-modes an d grouping face modes into partial intersection ones was proposed to reduce comput ation and improve system extension property. In combination, the sum rule based on Bayesian theory was used. The face recognition experiments with the ORL and A R face databases showed that the eigenface algorithm using multi-samples reache d a high recognition rate and a reasonable time cost. Grouping face modes makes training become a distributed computation job which reduces time cost for traini ng and brings the convenience of system extension when new face modes are to be added.

Abstract:A brand-new kind of mid-infrared multi-waveleng th radiation thermometer for the measurement of true temperature and emissivity near room temperature with high signal-to-noise ratio (SNR) was presented. By ap plying blazed grating and refractive-reflected optical system with high image q u ality and throughput, the temperature and emissivity were available simultaneous ly by the MCT semiconductor sensor array and electric system. Inner blackbody so urce was installed to compensate the surrounding temperature drift, and the temp erature of field stop and aperture stop was controlled by a heat pipe to reduce th e influence of stray radiation on temperature measurement. The main structures o f optical and electric systems were described in detail.

Abstract:A stepped-FMC W radar waveform applied for mm-wave automotive collision warning radar systems was proposed, which is easy to be generated digitally and its signal processing reduced the requirement of computational speed compared to conventional hgih-r esolution radars. An error approach algorithm was suggested for multiple vehicl e target detection and its usefulness in eliminating the false target by compute r simulation was confirmed.

Abstract:按每次变形Born迭代(DBIM)过程中，用入射场替代总场使非线性积分方程线性化，但线性化对非线性度很高的强散射体时将会带来很大的误差。为了克服DBIM的不足，本文基于目标区内、外电场积分方程导出反演积分方程，在每次迭代过程中，利用迭代法和双共轭梯度法求解非线性反演问题，利用数值模式匹配方法(NMM)求解正演问题．考虑到NMM解的z向解析性，推导出z向积分的解析表达式，大大减少了计算量．数值结果表明，本文方法与DBIM相比不仅具有更快的收敛速度，而且能反演更高的对比度．

Abstract:根据LFMCW系统的特点，提出了一种通过对信号自相关矩阵进行秩-1分解的方法来替代传统的FFT方法，以实现对目标距离的超分辨提取．通过应用Hopfield神经网络能量函数变换，将分解问题转化为一个简单的迭代问题来求解．文中通过计算机仿真和硬件系统的实际测试研究了它的性能，并与MUSIC、最大熵等其它谱估计方法做了比较，结果表明该方法具有更好的信噪比和分辨性能．

Abstract:介绍了将设计衍射光学元件的方法用于设计低旁瓣毫米波衍射天线的基本设计思想、设计结果和应用前景．计算机模拟结果达到了低旁瓣，尤其是第一旁瓣的效果．给出了实际应用的进一步优化方法。

Abstract:使用小波函数对多层介质的三维平面金属微带结构(具有水平方向和垂直方向电流)进行分析，即用二维小波函数模拟未知电流密度，根据不同方向金属板尺度的差异，选择不同分辨尺度的二维小波函数，并与传统矩量法比较．

Abstract:A method of fingerprint image enhancement based on BEG algorithm and wavelet transformation was introduced to enhance the image quality. First, a method to estimate the local image gradient, called the BEG ( best estimation of gradient) algorithm was proposed to extract the texture o rientation parameters. Then the frequency parameters in local fingerprint window were calculated. At last an adaptive Morlet wavelet filter was used to enhance the fingerprint image according to the parameters in the fore steps. The perform ance test shows that this method is valuable in practical uses.

Abstract:Several infrared image enhancement methods based on 2D TDI technigne using gray transform were put forward. The test results show that these methods are superior to the simple average method and can be implemented in real time. So they have high practical value.

Abstract:针对多光谱和SAR遥感图像特征层融合分类的特征选取问题，以Landsat卫星的TM图像和JERS-1卫星的SAR图像融合分类为例，给出了一种基于Rough Set理论的最佳分类特征选取方法．

Abstract:针对红外图像中的目标对比度低、尺寸小及背景复杂等特点，本文利用像素之间的相关性，提出了一种基于多重相关峰值检测红外弱小目标的检测方法，从而实现低信噪比条件下红外弱小目标的快速检测．实验表明该方法是一种抗噪性能强，自适应性能好的弱目标检测方法．

Abstract:通过脉冲加热阶段的红外无损检测一维理论模型，提出了一种评估缺陷深度信息的新算法，并给出了有限元模拟检测结果，分析了缺陷大小及脉冲加热时间对检测结果的影响、分析表明，该方法具有较高的检测精度．

Abstract:利用含时光折变双光耦合方程数字模拟计算了掺铁铌酸锂晶体中双光耦合的动态过程，分析了空间电荷场及其位相、光折变光栅位相等光折变参量的变化过程，解释了光折变自增强效应，提出了提高光折变光栅衍射效率的有效方法．

Abstract:建立了电气线路红外热像诊断热传导模型．利用红外热像仪检测电气线路表面温度场的分布和热传导模型计算电线、电缆等的内芯温度，及早发现故障隐患和火险隐患，并建立了模拟线路运行条件变化时的推算模型，扩大了检测的应用范围。

Abstract:A real time high efficiency nonlinear joint transform correlator was proposed. In this correlator, a multi focus hololens was used to produce joint power spectral array so that the areas of the liquid crystal light valve (LCLV) and the output light energy can be used effectively. The LCLV worked in near saturated state in order to realize nonlinear joint transform correlation. The theoretical analysis and experimental results verified that the optical correlation signal can be enhanced by this correlator.

Abstract:基于等效媒质理论，对周期性浮雕结构的抗反射特性进行了分析和研究。给出了二维对称的抗反射浮雕结构等效光学参数的估算方法。提出了基于最小特征尺寸考虑的脊基和隙空的设计概念。利用离子束刻蚀工艺技术，在Si片上制备了一种两维红外抗反射浮雕图案。测试结果表明，这种表面结构像单层抗反射膜一样，具有很好的增透效果，表面结构的等效折射率相当于镀层材料折射率，而刻蚀深度则相当于镀层的1／4波长厚度。

Abstract:分析了影响均匀性的主要因素和传统的校正方法。提出了利用半导体存储器的函数变换功能对红外焦平面阵列的非均匀性进行校正存储的实时校正新方法．阐述了校正的原理和实现的具体步骤；介绍了硬件电路原理框图和工作过程，并给出了实验结果。实验证明了这种方法的优越性，并取得了满意的实验结果。

Abstract:The experiments on 3mm radiowave propagatin attenuation induced by sea fog were carried out. The results show that dense fog induces 7.55dB/km attenuation at 3mm. The sea fog characteristic parameters were calculated. The measured attenuation was compared with that calculated by ITU model at different visibility. Signal scintillation characteristics were analyzed. Key words 3mm communication, attenuation, visibility, scintillation index.um 11211$$$$ YANG Cheng yongSchool of Life Sciences,Zhongshan University,Guangzhou 510275,China,ZHOU Shi ning,ZHOU Yi pin,LIN Yong cheng Abstract:Bacterium 11211 which produces chitinase was isolated from the South China Sea.The growth condition and chitinase production of bacteria were investigated.Na was necessary for bacterium 11211 growth.Colloid chiyin could induce bacteria to produce chitinase.The growth of bacteria was slow in the medium containing colloid chitin as main carbon source,and the enzyme activity reached maximum on 7 d of incubation.Following the purification,the enzyme was characterized and its molecular weight was estimated by SDS PAGE.