On aggregate available bandwidth in many-to-one data transfer—modeling and applications

This work investigates the modeling of aggregate available bandwidth in multi-sender network applications. Unlike the well-established client–server model, where there is only one server sending the requested data, the available bandwidth of multiple senders when combined together does exhibit consistent properties and thus can be modeled and estimated. Through extensive experiments conducted in the Internet this work proposed to model the aggregate available bandwidth using a normal distribution and then illustrates its application through a hybrid download-streaming algorithm and a playback-adaptive streaming algorithm for video delivery under different bandwidth availability scenarios. This new multi-source bandwidth model opens a new way to provide probabilistic performance guarantee in best-effort networks such as the Internet, and is particularly suitable for the emerging peer-to-peer applications, where having multiple sources is the norm rather than the exception.

基于AD590的温度测控装置研制

介绍了一种适用于在实验室条件下进行实验、研究与再开发的数字式温度检测与控制装置。该装置采用新型集成温度传感器AD590作为测温元件,并提供两路调控单元供选择进行实验比较。通过在恒温箱中进行测控温实验,获得了满意的效果。     

煤气混合流量配比及热值串级模糊控制系统

文中将模糊控制技术运用到煤气混合串级调节系统中,介绍了系统的构成、原理及控制算法,有效地实现了混合煤气热值的检测和控制。     

多传感器在线检测在高精度划线切割机器人系统中的应用

高精度型材划线切割机器人系统是应造船领域的型材的划线和切割而开发研制的 ,多传感器数据融合是该系统的关键技术之一 .因为造船中所使用的型材几乎完全都是变形的 ,为了提高划线和切割精度 ,在该系统中 ,建立了多传感器在线检测系统 ,引入了并行扩展式卡尔曼滤波的多传感器数据融合方法实现非线性的多传感器数据融合 .实验结果显示 ,多传感器数据融合可以有效的实现变形型材的在线检测 ,提高系统的测试精度和可靠性 ,该技术是实现型材的高精度划线和切割的保证     

基于测量的接纳控制研究

与传统的接纳控制算法相比,基于测量的纳控制有诸多优点,首先它无需知识应用的流量模型,其次它能动态适应网络的负载变化,提高网络资源的利用率。文中分析了基于测量的接纳控制的基本思想,并在此基础上提出和实现了一种自适应的接纳控制算法（Adaptive Measurement-Based Admission Control,AMBAC).作者通过实验对该算法进行了验证,发现在系统资源利用率（或接纳能力）接近的情况下,与传统的（固定时间窗口的）,MBAC相比,AMBAC能达到更低的平均分组丢失率。     

The transient regime of a multiwavelength pyrometer

The transient operation of a new multiwavelength pyrometer based on a dispersing prism and a Si photodiode array is presented. After calibration, transient tests were performed using a tungsten strip lamp, supplied by a current pulse of 0.3-s duration. Measurements were carried out with a data acquisition system consisting of a FET multiplexer, a DVM (14 bit, 100 kHz), and a buffer memory (64 kbytes). Pyrometer signals are processed off-line, and temperature vs time is displayed. With the present arrangement, temperature measurements at 20 wavelengths may be performed with 200s resolution. Faster measurements are possible with a reduced number of channels.Paper presented at the Third Workshop on Subsecond Thermophysics, September 17–18, 1992, Graz, Austria.Deceased     

煤炭销售计量自动控制与管理系统的开发应用

介绍了以计算机网络技术、条码技术、自动控制技术集成为手段、面向煤炭计量的销售自动控制与管理系统设计及实现过程。结合煤炭企业的现场实际 ,提出变型系统及实现方案。系统也可用于有类似的销售计量与管理需求的企业。     

自动测量仪器和测试系统的发展综述

展望了今后二三十年基于计算机的测量仪器和测试系统的发展趋势 :仪器的智能将进一步增强 ,标准化程度将进一步提高 ,网络化测控技术将迅速发展。本文对编制国内仪表长远发展规划具有较高参考价值     

零件几何参数的计算机测量系统

介绍了一种利用视频测量、计算机图像处理技术实现的零件几何参数测量系统。该系统具有较高的测量效率 ,能够达到较高的测量精度。阐述了系统组成原理、图像处理算法以及影响系统测量精度的主要原因     

Thermal conductivity of hydrogen for temperatures between 78 and 310 K with pressures to 70 MPa

The paper presents new experimental measurements of the thermal conductivity of hydrogen. The ortho-para compositions covered are normal, near normal, para, and para-rich. The measurements were made with a transient hot wire apparatus. The temperatures covered the range from 78 to 310 K with pressures to 70 MPa and densities from 0 to a maximum of 40 mol · L^–1. For compositions normal and near normal, the isotherms cover the entire range of pressure, and the temperatures are 78, 100, 125, 150, 175, 200, 225, 250, 275, 294, 300, and 310K. The para measurements include eight isotherms at temperatures from 100 to 275 K with intervals of 25 K, pressures to 12 MPa, and densities from 0 to 12 mol · L^–1. Three additional isotherms at 150, 250, and 275 K cover para-rich compositions with para percentages varying from 85 to 72%. For these three isotherms the pressures reach 70 MPa and the density a maximum of 30 mol · L^–1. The data for all compositions are represented by a single thermal conductivity surface. The data are compared with the experimental measurements of others through the new correlation. The precision (2) of the hydrogen measurements is between 0.5 and 0.8% for wire temperature transients of 4 to 5 K, while the accuracy is estimated to be 1.5%.