CMOS／SEED光电子集成Crossbar互连网络的实现及控制

本文报道了光电子集成 Crossbar互连网络的光学实现及电控制方法。采用带光窗口的 CMOS/SEED灵巧像元列阵作为逻辑控制交换开关节点 ,输出光强的高低态对比度约为 1.4。由波长为 85 0 nm的半导体激光器发出的光束经过位相计算全息光栅分束器分束 ,形成 8× 2的光束阵列 ,为 CMOS/SEED光调制器窗口列阵提供泵浦光源 ,采用精密加工的高精度二维光纤阵列作为信号输入、输出接口器件。采用计算机并口产生电控制信号实现网络的交叉连接功能 ,编制了相应的控制软件。实验上完成了 16× 16 Crossbar光互连网络的交换功能     

多协议标记交换(MPLS)技术研究

主要介绍了多协议标记交换(MPLS)技术的基本概念、网络构成和工作原理,在此基础上,提出了实现MPLS交换机路由器的关键技术。     

Effects of electrical stimulation on early postmortem muscle pH and temperature declines in pigs from different genetic lines and halothane genotypes

The objective of this study was to determine if electrical stimulation (ES) early postmortem is an effective method to generate PSE-like meat. One hundred and thirty-eight gilts (85-125 kg) from heavy muscled (HM), normal muscled (NM), and light muscled (LM) porcine genetic lines were subjected to one of two treatments: ES (26 pulses of 500 V, 60 Hz) at 3 min postmortem or non-stimulated (NS). Pigs from HM line were further characterized as halothane (HAL) carriers (Nn) or non-carriers (NN). ES carcasses had lower (P<0.0001) pH values and higher (P<0.0001) temperature than NS carcasses during the first 56 min postmortem. ES carcasses had lower (P<0.0001) a*-values, and color and firmness scores, as well as higher (P<0.0001) drip loss and L*-values. No significant interactions were found between treatment and genetic line or HAL gene status with regard to pH, temperature, or quality characteristics. Temperature and pH declines within the first hour postmortem were not affected by genetic line, but slight (P<0.01) quality differences were observed. Nn and NN did not differ in pH or temperature within the first hour postmortem, but Nn carcasses had lower (P<0.01) color and firmness scores, and higher (P<0.05) drip loss. These results show that ES early postmortem is an effective method for simulating PSE development in pigs of different muscling and HAL gene status, and suggest that pH and temperature decline alone cannot explain all aspects of pork quality.     

流量精细化运营的网络架构方案

随着3G网络的发展与智能终端的普及,激发了用户对移动互联网的使用。移动互联网的发展一日千里,流量的猛增大大超前运营商预期。运营商传统的语音业务、信息类业务等在移动互联网业务的挤压之下,经营收入受到极大的挑战,并出现下降的趋势。而"增量不增收"的问题同时在困扰着运营商,巨大的网络建设投入并没有换来良好的数据业务收入,使得运营商处在前后两难的境地。因此,流量的精细化运营受到运营商的高度重视,如何建设能够支撑流量精细化运营的平台体系成了目前讨论研究的热点。整体而言,流量经营涉及到无线网、WLAN、终端、后端支撑系统的建设以及市场营销思路的转变,本为将重点就后端支撑系统架构进行规划与解读,来解读其整体如何支撑流量价值提升。     

Evaluation of a conductance method for enumerating Escherichia coli on chicken, pork, fish, beef, and milk

Experiments were conducted to evaluate a rapid method for enumerating Escherichia coli on food products of animal origin. In study I, rinses from samples of chicken, ground beef, pork, and fish and samples of milk were inoculated with various levels of actively growing E. coli. Conductance assays were monitored at 44 degrees C on each sample using coliform medium supplemented with 2% dextrose. High correlations between E. coli concentrations and E. coli conductance detection times (ECDTs) were found (r = -0.97 to -0.99) for all foods tested in all replicates; however, in most cases, the concordance correlation coefficients (r(c)) were low, indicating a lack of predictive accuracy. In this study, low accuracy of the conductance method for estimating E. coli counts was attributed to use of concentrations of E. coli that exceed 10(6) CFU/ml, the detection threshold of the instrument. Slopes of the linear regression lines (E. coli concentration vs. ECDT) for each type of food tested were not significantly different (P < 0.0001), indicating that a single regression equation may be used to estimate E. coli counts for all of the types of food tested in 1 to 7.5 hours using ECDT. In study II, ECDTs for pork, fish, beef, and milk significantly (P < 0.05) decreased in a linear manner as time of temperature abuse increased. Although the ECDT for chicken decreased linearly, no significant differences were observed between 3 and 6 or between 9 and 12 h of abuse. These data demonstrate a strong relationship between increasing populations of E. coli due to temperature abuse and decreasing ECDT. Therefore, results from both studies indicate that this method could be useful for estimating naturally occurring populations of E. coli on foods of animal origin.     

太钢冷热混合线计算机控制系统

简述了不锈钢冷热处理混合线的生产工艺,介绍了计算机控制系统组成、网络通讯系统、控制思想和软件,该系统已于99年3月在太钢冷轧厂投入使用。     

信赖域方法在红外图像序列处理中的应用

在以光源为激励的红外无损检测图像序列采集过程中,由于受到不均匀加热、环境辐射等因素影响,采集到的图像序列存在着背景噪声大、对比度低、缺陷显示效果差等问题,易造成缺陷的漏检。为提高缺陷检出率,提出了基于信赖域反射算法的红外图像序列处理技术。通过算法对加热不均造成的背景噪声进行快速曲面拟合,并将拟合得到的背景曲面从原始图像中减去,从而去除加热不均的背景噪声。利用主成分分析算法对去除背景后的图像序列进行缺陷特征信息提取,进一步提高红外图像的信噪比。结合区域生长算法对缺陷区域进行分割,以提取缺陷区域。实验结果表明:采用上述方法,能够有效地改善红外图像的信噪比,进而达到提高缺陷检出率的目的。