基于TMS320DM642的汽车牌照识别系统设计

介绍了用TI公司的TMS320DM642高速定点DSP实现汽车牌照自动识别的系统设计，提出了一些实用算法并给出了基于DSP的程序优化方法。     

Highly Stretchable and Sensitive Strain Sensors Using Fragmentized Graphene Foam

Stretchable electronics have recently been extensively investigated for the development of highly advanced human‐interactive devices. Here, a highly stretchable and sensitive strain sensor is fabricated based on the composite of fragmentized graphene foam (FGF) and polydimethylsiloxane (PDMS). A graphene foam (GF) is disintegrated into 200–300 μm sized fragments while maintaining its 3D structure by using a vortex mixer, forming a percolation network of the FGFs. The strain sensor shows high sensitivity with a gauge factor of 15 to 29, which is much higher compared to the GF/PDMS strain sensor with a gauge factor of 2.2. It is attributed to the great change in the contact resistance between FGFs over the large contact area, when stretched. In addition to the high sensitivity, the FGF/PDMS strain sensor exhibits high stretchability over 70% and high durability over 10 000 stretching‐releasing cycles. When the sensor is attached to the human body, it functions as a health‐monitoring device by detecting various human motions such as the bending of elbows and fingers in addition to the pulse of radial artery. Finally, by using the FGF, PDMS, and μ‐LEDs, a stretchable touch sensor array is fabricated, thus demonstrating its potential application as an artificial skin.     

EGS通信网络可靠性分析研究

文中采用图论和最小路法,通过对电子政务网络通信网络系统需求的分析,对基于二端口的网络可靠性、全网可靠性进行了定量性的分析,并给出了相应的算式模型,对电子政务通信网络系统可靠性的研究提供了一些分析方法。     

CMOS RF power amplifier with reconfigurable transformer

A CMOS RF power amplifier that can change the output transformer ratio is presented. The CMOS power amplifier is fully integrated in a 0.13 /spl mu/m process and has a power added efficiency (PAE) of 38% at 2.1 GHz and an output power of 30.7 dBm with 3.0 V supply voltage. The PAE at an output power of 16 dBm was increased by 40% by altering the transformer ratio.     

Improving local minima of columnar competitive model for TSPs

The columnar competitive model (CCM) has been recently proposed to solve the traveling salesman problem. This method performs much better than the original Hopfield network in terms of both the number and the quality of valid solutions. However, the local minima is still an open unsolved issue. This paper studies the performance of the CCM and aims to improve its local minima problem. The contributions of this paper are: 1) it proves by mathematics that the CCM is hardly to escape from local minimum states in general; 2) an alternate CCM is presented based on a modified energy function so as to enhance the capability of the original CCM; 3) a new algorithm is proposed by combining the alternative CCM with the original one, which enables the network to have lower energy level when trapped in local minima, this makes the network to reach the optimal or near-optimal state quickly; 4) Simulations are carried out to illustrate the performance of the proposed method.     

基于多普勒信息的NSHT航迹起始方法

针对临近空间高超声速目标航迹起始困难的问题,依据超视距雷达能够提供目标精确多普勒信息的特点,从径向速度、径向机动能力和角速度3个方面推导了航迹起始约束条件,文中给出了更为精确的相关波门设计方法,通过目标运动特性确定最终航迹。仿真结果表明,该方法能够有效起始临近空间高超声速目标航迹,且效果优于传统利用目标位置信息进行航迹起始的方法。     

分子筛脱水装置在轻烃回收系统中的应用

安塞油田轻烃回收系统利用原料伴生气采用高压低温、加压分馏的工艺回收液化气和轻烃。针对原料气及混合液烃中含水较高,冬季易产生冻堵的难题,重点介绍了分子筛的结构、特点、吸附工作原理和方法,脱水装置理论参数计算、工艺选择,以及在安塞油田轻烃回收系统现场使用情况,并对其使用前后的效果进行对比分析。分子筛脱水效果显著,解决了因原料气含水冻堵装置的问题,并且提高了产品产量和质量。     

基于物理层网络编码的非对称中继系统性能分析

在无线通信研究中,网络编码因其可有效提升带宽利用率的特性得到了大量关注.但是,网络编码用于双向中继信道(TWRC)时,中继位置的不对称将造成系统性能的下降,故在源节点使用分层调制的方法来解决此问题.研究了分层调制和物理层网络编码的联合以及优化,并进行了系统仿真.仿真结果显示,在非对称中继信道下,通过与传统调制方案(CM...     

Holography and plasma oxidation for uniform nanoscale two dimensional channel formation of vertical organic field-effect transistors with suppressed gate leakage current

Vertical organic field-effect transistors (VOFETs) with nanoscale channel openings have been fabricated using pentacene as an active layer material. To achieve uniform nanoscale two-dimensional channel openings, a laser holography lithography has been introduced. Uniformly distributed and well-aligned holes with 250 nm diameter were successfully obtained with the laser holography lithography. VOFET devices with these channel openings have shown high on/off ratio of about 10³ without any further treatment. Gate leakage current was also decreased with an additional insulating layer generated on the gate electrode sidewall via plasma oxidation.     

基于FEA多边形高压直流输电导线芯设计

为了研究导线边数对多边形导线附近磁场分布的影响,运用有限元软件建模的方法对高压直流输电导线进行仿真,对比分析不同形状导线芯附近磁场分布情况,研究导体形状与导体附近磁场关系,分别分析了外径和内径方向磁场分布特性并研究了磁场最大点与导线外径的关系,各多边形直径方向磁场分布有相似的规律,从内向外磁场逐渐增加,到达边缘附近开始减小;边数越多,导体附近最大磁场数值越大,外径方向最大磁场点位于导体内部并逐渐趋于顶点,内径方向最大磁场点位于边缘中点;三边形导线边缘磁场强度明显比其他多边形要低。