CCD摄像快速瞄准的误差补偿方法研究

针对尺寸大、厚度薄、形状复杂的大型变压器铁心硅钢片尺寸与形状测试，研究了一种以CCD摄像头作为瞄准装置的非接触式摄像快速瞄准方法。通过快速采集被测物铁心硅钢片边缘轮廓图像信息，利用图像处理技术进行快速瞄准的误差自动补偿，提高了大型变压器铁心硅钢片测试系统的瞄准精度。     

Stochastic models for capturing image variability

We review a result in modeling lower order (univariate and bivariate) probability densities of pixel values resulting from bandpass filtering of images. Assuming an object-based model for images, a parametric family of probabilities, called Bessel K forms, has been derived (Grenander and Srivastava 2001). This parametric family matches well with the observed histograms for a large variety of images (video, range, infrared, etc.) and filters (Gabor, Laplacian Gaussian, derivatives, etc). The Bessel parameters relate to certain characteristics of objects present in an image and provide fast tools either for object recognition directly or for an intermediate (pruning) step of a larger recognition system. Examples are presented to illustrate the estimation of Bessel forms and their applications in clutter classification and object recognition.     

Compensating for moderate effective throughput at the desktop

This article presents the design and development of a networking system architecture targeted to support high-speed TCP/IP communication over ATM. The discussed architecture has been developed in the form of an integrated system which incorporates state-of-the-art software and hardware subsystems, and an OC-12c ATM adapter (622 Mb/s). Moreover, the design of this embedded system has been based on the Chorus real-time operating system, which, in turn, hosts an accelerated TCP/IP protocol stack over ATM. Furthermore, the embedded system board has been developed according to the PCI specification to easily be plugged into a host platform. In addition, the OC-12c ATM adapter subsystem has been designed and developed in order to also be plugged into the same host. The developed architecture has proven very efficient and reliable, providing high-throughput and low-latency bulk data communications. The measured performance on an OC-3c-based (155 Mb/s) testbed has shown that an optimally implemented TCP/IP stack, hosted by a real-time kernel and coupled with an ATM adapter, offers a robust desktop platform for high-speed end-to-end communications. The main feature of the accelerated TCP/IP protocol stack is the out-of-band processing of control and data information. The protocol accelerator embedded system processes the TCP/IP headers and accomplishes checksum computations, while data is transferred from the host's user memory space directly to the network. Finally, for validation purposes, the prototype system has been incorporated in an existing networking infrastructure targeted to support mass storage applications     

台式电源的模块设计概念

现今，技术领先的电源公司在系统设计阶段就采用“模块设计方法”。某些医疗设备，包括数字和视频图像、数字Ｘ光机器、心电图监视器等都使用了模块电源设计概念。其优点在于加快面市时间，降低固定设备成本和降低电源单元的成本。     

桌面虚拟化模式研究

信息技术(information technology,IT)的发展使得各类IT终端的用户类型越来越多,而通用桌面虚拟化方法已无法满足用户多样性的要求。通过桌面虚拟化技术可确保每个用户可以接入适当的桌面和应用,从而满足用户的需求,而不受单一技术的限制。针对一种或多种工作场景,提出了托管共享桌面、托管虚拟桌面基础结构(virtualdesktop infrastructure,VDI)桌面、流虚拟磁盘(virtual hard disk format,VHD)桌面、物理桌面、本地虚拟机(virtual ma-chine)桌面、按需应用等6种桌面虚拟化模式,并分析了各种桌面模式的优势及适用场景。     

Synchronization for interactive multimedia presentations

When multimedia presentations allow users to make online adjustments such as reverse, skip, freeze-restart, and scale, maintaining temporal synchrony among several media streams becomes a complex modeling problem. Our approach uses dynamic extended finite-state machines for the task-an “actor” DEFSM for each medium and a “synchronizer” DEFSM to orchestrate them. This model achieves clear state-transition control flow and allows concise, precise specifications     

The battle for the desktop [network computers]

This article describes how, with a new type of machine called the network computer, or NC, a group of upstarts wants to muscle in on the personal computer's turf. The author examines whether this type of computer, designed from the outset to work on a network, can topple the PC's dominance of the workplace and details how the masterminds behind the PC are fighting back-with the even newer NetPC     

Virtual meetings with desktop conferencing

Teleconferencing has come a long way since its early days as little more than three-way calling services over the telephone. Today's virtual meetings boil down to collaborative computing on desktops or laptop computers. Using the communications protocol of the Internet, today's desktop conferencing can incorporate audio, video, shared documents and engineering drawings, whiteboard for diagrams, and/or text chat for meetings held in the relative comfort of an office     

Minimal presentations for irreducible sofic shifts

We re-cast a theorem of Willems (1989) in terms of symbolic dynamics. We then present a new result which characterizes when an irreducible sofic shift (i.e., constrained system) has a unique minimal irreducible presentation     

智能网管到桌面——瑞斯康达"Iscom"率先实现8口远端管理

带智能网管功能的“Iscom”8口快速以太网交换机RC2008S采用基于SNMP/HTTP/Telnet管理网络等多种网络管理方式，可以实现网络远端管理，让网络在桌面也可以智能交换。2003年，“Iscom”在将最新技术应用于产品研发的同时，将继续以顾客导向为开发产品线的基石，在产品开发上坚持两方面：第一是坚持对未来技术的把握；第二是面对中低端市场，以自身的特色吸引用户。这款8口的带智能管理功能的交换机是目前国内第一款8口上实现智能管理功能的以太网交换机，不仅使瑞斯康达公司自身的产品线得到了丰富，更重要的是为用户组建完全可管理、…     

阿朗为桌面电话带来全新应用体验

日前,阿尔卡特朗讯宣布面向多种通信平台推出创新型"智能桌面电话"。阿尔卡特朗讯OmniTouch 8082 My ICPhone将整合至阿尔卡特朗讯OpenTouch系列通信平台中,并将在第二季度整合至面向酒店行业的阿尔卡特朗讯OmniPCXEnterprise平台中。按照计划,该产品将于第三季度整合至阿尔卡特朗讯OmniPCX Office平台。     

台式计算机ATX开关电源检修技巧

针对台式计算机ATX开关电源主要故障,从ATX开关电源的结构特点及基本工作过程分析出发,根据多年教学和维修经验,提出了通过对关键测试点波形和参数的检测,确定故障范围,对故障范围内的易损元件观测判断,能很快找到损坏元件,快速修复开关电源的新方法,对计算机维修人员和教学、自学人员有一定的参考价值和应用价值。     

Scanning face models with desktop cameras

Generating face models of humans from video sequences is an important problem in many multimedia applications ranging from teleconferencing to virtual reality. Most practical approaches try to fit a generic face model in the two-dimensional image, and adjust the model parameters to arrive at the final answer. These approaches require the identification of specific landmarks on the face, and this identification routine may or may not be an automated process. In this paper, we present a method for deriving the three-dimensional (3-D) face model from a monocular image sequence, using a few standard results from the affine camera geometry literature in computer vision, and spline-fitting techniques adopted from the nonparametric regression literature in statistics. No prior knowledge of the camera calibration parameters and the shape of the face is required by the system, and the entire process requires no user intervention. The system has been successfully demonstrated to extract the 3-D face structure of humans in several image sequences     

智能桌面照明系统设计

本照明系统设计可通过超声波测距,感应人体与LED灯的位置距离,当人体靠近至设定数值时,系统会发出警告以提醒人们的坐姿.采用的数码管模块,可设置相应的学习时长,用来提醒人们休息.采用的光检测模块,可不断接收周围光照强度,以能够自动改变LED灯的亮度,使人们能在适合光照亮度下进行学习或工作,达到保护眼睛视力的功能.     

云桌面在高校中的应用

云桌面融合了企业级服务器与虚拟化平台产品的功能和优势,能够将用户的桌面环境以虚拟机的形式托管到数据中心内的高性能服务器上.管理员可以实现对所有云桌面资源进行可视化的便捷管理,快速地批量部署云桌面满足大量用户的需求等操作.用户可以通过PC、瘦客户机等多种终端使用自己的云桌面,方便地完成日常办公、教学、管理等任务.     

A desktop electrohydrodynamic jet printing system

This paper discusses the design and integration of a desktop system for electrohydrodynamic jet (E-jet) printing. E-jet printing is a micro/nano-manufacturing process that uses an electric field to induce fluid jet printing through micro/nano-scale nozzles. This enables better control and resolution than traditional jet-printing processes. The printing process is predominantly controlled by changing the voltage potential between the nozzle and the substrate. The push to drive E-jet printing towards a viable micro/nano-manufacturing process has led to the design of a compact, cost effective, and user friendly desktop E-jet printing system. The hardware and software components of the desktop system are described in the paper. Experimental results are presented to validate the performance of the system.     

Windows安全配置指南软件研制

本文系统研究了目前我国信息系统普遍使用的Windows系列操作系统及其应用程序的安全功能及配置方法,并介绍了在此基础上开发的指南软件的各种功能,以指导用户将电脑配置得更加安全。     

Automated synthesis for testability

The authors present an integrated, compiler-driven approach to digital chip design that automates mask layout and test-pattern generation for 100% stuck-at fault coverage. This approach is well suited for designs where it is most important the minimize the design cycle time rather than the silicon area. The authors show that by compiling from a unified design specification followed by logic synthesis it is possible to reduce the problem of automatic test-pattern generation. They present a language-based design capture and logic synthesis with hierarchical test pattern generation and redundancy removal techniques. A section on benchmark results highlights the close coupling of a language-based design specification, logic synthesis, and testability