A prediction-based link availability estimation for routing metrics in MANETs

A Mobile Ad hoc Network (MANET) is a collection of wireless mobile terminals that are able to dynamically form a temporary network without any aid from fixed infrastructure or centralized administration. One critical issue for routing in MANETs is how to select reliable paths that can last as long as possible since terminal mobility may cause radio links to be broken frequently. To solve this problem, a criterion that can judge path reliability is needed. The reliability of a path depends on the number of links and the reliability of each link constituting the path. Many routing metrics in terms of number of links have been proposed, such as the shortest path routing. However, how to measure link availability or reliability in order to find more reliable paths has not been addressed adequately in the literature. (By a link being available, we mean that the radio quality of the link satisfies the minimum requirement for successful communication. Link availability is used to measure probability or degree that a link is available. The terms availability and reliability are used interchangeable in this paper.) This paper first introduces a prediction-based link availability estimation to quantify the link reliability. This quantity makes use of some instantly available information and also considers the dynamic nature of link status in order to properly reflect the link reliability. Then, this quantity has been further used to develop routing metrics for path selection in terms of path reliability to improve routing performances. The proposed schemes have been investigated through computer simulation.     

Wavelet based image adaptive watermarking scheme

An image adaptive watermark casting method based on the wavelet transform is proposed. To increase the robustness and perceptual invisibility, the algorithm is combined with the quantisation model based on the human visual system. The number of factors that affect the noise sensitivity of the human eye are taken into consideration. Experimental results demonstrate the robustness of the algorithm to high compression environments     

超越摩尔定律的封装创新

到了2010年,“超越摩尔定律（More Than Moore）”的业界思潮将进一步推动系统集成（而不是晶体管密度）的发展,并引发具有超强功能的电子设备的革命。     

Perturbation-Based Eigenvector Updates for On-Line Principal Components Analysis and Canonical Correlation Analysis

Principal components analysis is an important and well-studied subject in statistics and signal processing. Several algorithms for solving this problem exist, and could be mostly grouped into one of the following three approaches: adaptation based on Hebbian updates and deflation, optimization of a second order statistical criterion (like reconstruction error or output variance), and fixed point update rules with deflation. In this study, we propose an alternate approach that avoids deflation and gradient-search techniques. The proposed method is an on-line procedure based on recursively updating the eigenvector and eigenvalue matrices with every new sample such that the estimates approximately track their true values as would be calculated analytically from the current sample estimate of the data covariance matrix. The perturbation technique is theoretically shown to be applicable for recursive canonical correlation analysis, as well. The performance of this algorithm is compared with that of a structurally similar matrix perturbation-based method and also with a few other traditional methods like Sanger’s rule and APEX.

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激光大气闪烁统计特征的研究进展

综述了复杂地形条件下激光大气闪烁效应的实验及理论研究结果,包括实验数据处理方法、闪烁概率分布的极大似然模型、闪烁频谱特征系统分析方法、小波变换频谱分析方法、光波起伏频谱与湍流谱的关系,以及闪烁的间歇性等统计特征．     

用单片机+CPLD实现液晶显示

本文介绍TC1602A液晶显示器的应用，以及单片机和CPLD综合应用的电路和软件设计，将CPLD应用到逻辑电路设计中，既简化了硬件电路，又节省了系统资源。     

CCN网络中一种基于代理主动缓存的用户移动性支持方案

该文提出以内容为中心的网络(CCN)中一种基于代理的主动缓存方案。通过代理服务器主动请求与缓存移动切换过程中用户未能获取的内容,解决CCN网络中用户移动性支持问题。与现有CCN网络用户移动性支持方案相比,该文提出的基于代理的主动缓存方案,用户获取内容的时间成本与代理服务器获取内容的时间成本较低,用户的移动切换时延与内容获取的平均时间较短。该方案可有效利用CCN网络共享的内容资源,减缓用户移动对实时业务的不良影响。     

A Novel Electroless Process for Embedding a Thin Film Resistor on the Benzocyclobutene Dielectric

To realize embedded resistors on multilayer benzocyclobutene (BCB) either on-chip or on-board, a low-cost large format electroless process for deposition of NiP and NiWP thin-film resistors using both low-temperature (25°C) and high-temperature (90°C) baths has been developed. The electroless process exhibits uniform resistor thickness in the submicron range and offers low profile and excellent adhesion to the BCB dielectric layer. The resistor films also act as a seed layer for direct electroplating of copper traces. The NiP alloys can also be tailored to a variable temperature coefficient of resistance (TCR) with different alloy compositions. The electroless process can be adopted in the PCB manufacturing industries with no additional investment. This article is the first report on electroless plated thin film resistors on low loss BCB dielectric.     

利用串行RapidIO连接功能增强DSP协处理能力

SRIO IP解决方案提供真实双向数据流,大大增强连接功能。目前,对高速通信与超快计算的需求正与日俱增。有线和无线通信标准的应用随处可见,数据处理架构每天都在扩展。较为普遍的有线通信方式是以太网(LAN、WAN和MAN网络)。手机通信是最为常见的无线通信方式,由应用了DSP的     

Effects of water on the rheological characteristics of biscuit dough and quality of biscuits

 The influence of water on the rheological characteristics of biscuit dough and quality of biscuits was studied. A variation of even 1% in water content considerably changed the various rheological characteristics of biscuit dough. Increasing water content by 3% significantly increased the compliance from 32.6% to 45.6%, and decreased the extrusion time from 100 s to 34 s, the apparent biaxial extensional viscosity from 3.06×10⁵ Pas to 1.5×10⁵ Pas, and the consistency from 943 Ns to 620 Ns for dough based on weak wheat flour. The elastic recovery of biscuit dough increased significantly from 0.425 mm to 0.535 mm. Dough became more cohesive and adhesive with increasing water content, whilst biscuits became harder, as indicated by increases in density, breaking strength and compression strength. Received: 14 September 1998