城市高清网络视频监控系统建设

随着国内外政治、治安局势的不断变化,城市高清网络视频监控系统已经成为公安机关依法履行职能打击违法犯罪的一个重要手段。本文介绍了一种城市高清网络视频监控系统建设方案及技术要求,并以此为框架进行概括总结,系统基本分为前端监控资源采集、监控资源接入、联网集中管理平台、图像资源存储以及图像资源共享平台建设等部分。     

乙炔前加氢催化剂在乙烯装置上的应用及评价

介绍了Kataleuna催化剂公司开发的KL7741B－T型乙炔前加氢催化荆在大庆石化公司乙烯新区装置上的应用情况。该催化剂在2010年8月再次应用于大庆石化公司乙烯新区装置，在投用后的半年时间内，一度出现催化剂活性下降的情况。通过调整前加氢反应器各段入口温度以及进料中CO、丁二烯、硫、砷杂质的含量，该催化剂活性下降的趋势得到有效控制，乙炔前加氢反应器的运行逐步趋于稳定。     

Quality control and due diligence in project management: Getting decisions right by taking the outside view

This paper explores how theories of the planning fallacy and the outside view may be used to conduct quality control and due diligence in project management. First, a much-neglected issue in project management is identified, namely that the front-end estimates of costs and benefits – used in the business cases, cost–benefit analyses, and social and environmental impact assessments that typically support decisions on projects – are commonly significantly different from actual ex post costs and benefits, and are therefore poor predictors of the actual value and viability of projects. Second, it is discussed how Kahneman and Tversky's theories of the planning fallacy and the outside view may help explain and remedy this situation through quality control of decisions. Third, it is described what quality control and due diligence are in the context of project management, and an eight-step procedure is outlined for due diligence based on the outside view. Fourth, the procedure is tested on a real-life, multibillion-dollar project, organized as a public–private partnership. Finally, Akerlof and Shiller's recent discussion in economics of “firing the forecaster” is discussed together with its relevance to project management. In sum, the paper demonstrates the need, the theoretical basis, a practical methodology, and a real-life example for how to de-bias project management using quality control and due diligence based on the outside view.     

Low-latency and low-overhead encoder ASIC in the ATLAS LAr calorimeter trigger upgrade

In this article, an encoder Application Specific Integrated Circuit (ASIC) for high-speed serial data transmission is presented. The ASIC implements a low-latency and low-overhead line code and is fabricated with a commercial 0.25-µm Silicon-on-Sapphire CMOS technology. The ASIC operates at 640 MHz with a latency of no greater than 6.25 ns and the overhead of 14.3%. The encoder will be integrated with a serialiser and will be used in the A Toroidal LHC ApparatuS Liquid Argon (LAr) calorimeter Phase-I trigger upgrade.     

打印审计系统的设计

本文在对打印审计系统的系统实现目标进行分析的基础上,阐明了系统的实现原理。对打印审计系统的系统设计和实现方法作了详细的说明。同时,对打印审计系统的可行性、可靠性和技术风险也作了相关分析。     

Application of PLC's as front-end pre-processors in factory information systems

Factory information systems (FISs) have grown in acceptance largely because of the successful integration of a variety of data-collection, entry and display devices. The traditional factory computer system by and large ignored the moment-by-moment consequences of production processes, and focused instead on the assistance offered by automated shift-end counting and scheduling procedures. Separate systems handled the various functions (e.g. orders, raw materials, inventory, scheduling, etc.) and the assessment of productivity was left to the findings of endless meetings, negotiations and the interpretation of aged data reports. The data under consideration, however carefully collected, was so much after the event that problems forced the factory into a crisis-management mode in the hope that some restitution could be made. Real-time data is normally available in the process itself but is difficult to condense into a form that is useful for scheduling and FIS functions. Such data contains vital information as to the actual rela-time machine performance on the shop floor, and if processed correctly can be used to indicate and forecast production problems so that calm, yet timely, adjustments to schedules, etc. can be made. This paper describes how a PLC (programmable logic controller) was used to collect, pre-process and pass summary results to a low-cost supermicro computer for production monitoring and FIS purposes. This work was undertaken in response to an industry need for low-cost systems that could be retrofitted to factories with minimal disturbance to their day-to-day operations. This paper is a sequel to “Production Monitoring—A Proven Productivity Tool”, which appeared in Volume 4 Number 4 (November 1989) of this journal, on pages 335–348.     

网站前端优化的一些小经验

第四届D2论坛顺利结束,我也来和各位分享一下自己在前端优化方面的一些小经验。其实这些经验本身都是来自Yaho的优化原则,笔者只不过结合自己有限的实践经验进行了分析,希望对大家的实际工作有所帮助。     

Dual-Antenna RF CMOS Front-End for Interferer Removal in Ultra-Wideband Systems

Many ultra-wideband (UWB) systems are challenged by strong jammers and narrowband interferers. Using two antennas, we demonstrate a robust UWB radio frequency (RF) front-end design in a 0.25 μm mixed-signal complementary metal oxide semiconductor (CMOS) technology. The proposed realization is capable of adaptively removing a high-power, narrowband interferer early in the receiver chain avoiding front-end saturation and preserving UWB signal power. The early interferer removal resulting in interferer-free demodulation is based on the least mean squares (LMS) algorithm and achieved through a novel combiner low-noise amplifier and noise optimized filtering. Circuit level RF simulations of the proposed circuitry indicate a maximum improvement in signal-to-interference ratio of 39.6 dB.     

14位50MS/s100mW0.18μm CMOS流水线ADC

实现了一种14位40MS/s CMOS流水线A/D转换器(ADC)。在1.8V电源电压下,该ADC功耗仅为100mW。基于无采样/保持放大器前端电路和双转换MDAC技术,实现了低功耗设计,其中,无采样/保持放大器前端电路能降低约50%的功耗,双转换MDAC能降低约10%的功耗。该ADC采用0.18μm CMOS工艺制作,芯片尺寸为2.5mm×1.1mm。在40MS/s采样速率、10MHz模拟输入信号下进行测试,电源电压为1.8V,DNL在±0.8LSB以内,INL在±3.5LSB以内,SNR为73.5dB,SINAD为73.3dB,SFDR为89.5dBc,ENOB为11.9位,THD为-90.9dBc。该ADC能够有效降低SOC系统、无线通信系统及数字化雷达的功耗。     

多媒体网络视频监控前端数据动态集成仿真

针对传统多媒体网络视频监控前端数据集成方法存在数据交互时间过长的问题,提出一种多媒体网络视频监控前端数据动态集成方法。划分数据集中的数据流,并对多媒体网络视频监控前端数据集进行分组,并行处理数据流,并将结果进行合并处理,完成数据的动态聚合处理,根据数据的动态聚合处理结果建立监控前端数据动态集成模型,实现监控前端数据的动态集成。采用对比实验的方式,将三种不同的传统多媒体网络视频监控前端数据集成方法与所提方法进行对比,实验结果证明,上述集成方法的数据交互时间最短,在前端数据的动态集成方面更具有优越性。