一种流媒体实时水印嵌入与检测方法

研究了现有数字水印方案及算法,提出了基于I帧DCT系数的流媒体实时水印嵌入与检测方法,为数字媒体内容安全传输和有效监测提供了一种技术手段,并已将该方法用于互联网音视频监管方案中。     

用于准二维移动容迟容断网络的实时资源分配策略

资源分配是移动容迟容断网络的核心问题之一,影响着容迟容断网络路由甚至整个系统的效率.然而目前移动容迟容断网络的资源分配策略大多基于神经网络和遗传算法的混合算法,计算量大,不利于实时应用.为此根据移动网络可预测环境,提出了接入路由器消息矩阵及准二维接入带宽的约束条件,在此基础上建立了基于效用函数的资源分配策略,以满足实时要求.算法具有O(n)的算法复杂度,仿真结果显示切换掉话率和新呼叫阻塞率仅比最优化算法升高约1/4,计算用时则只有其36.99％.说明其在保证实时性的前提下仍能提供较好的QoS.算法可以进一步推广到二维移动场景中.     

Method of coupled interactions for real-time management of resource allocation

A method of coupled interactions for real-time management of resource allocation is proposed. A distinctive feature of the method is the replacement of the enumeration of decision patterns, requiring high computational efforts, by bilateral negotiations aimed at detecting conflicts and reaching compromises between incoming requests and available means in constructing complex schedules. This feature provides significant advantages during solution of complex problems of real-time resource allocation, which can be important for corporate and government management systems.     

医院感染实时监测和预警系统在临床护理中的应用效果调查

目的 :对医院感染实时监测和预警系统在临床中的应用效果进行分析和研究。方法 :所选用B/S构架及J2EE的新开发技术,后台的数据库系统是以SQL SERVER为主,后台的数据库系统是可以与目前各个医院信息系统相连接的,是医院感染管理信息系统得到有力的开发。结果 :对医院感染所发生的发病情况和因素进行实时监测和预警系统,可以起到有效安全的检测和统计功能。结论 :通过对医院感染进行实时的检测和预警系统在临床中的实践应用效果,使医院感染检测的安全性和准确性得到充分的提高,同时也大大提高了医院感染管理的质量和效果。     

A low-power readout circuit for nanowire based hydrogen sensor

This paper presents a fully integrated lock-in amplifier intended for nanowire gas sensing. The nanowire will change its conductivity according to the concentration of an absorbing gas. To ensure an accurate nanowire impedance measurement, a lock-in technique is implemented to attenuate the low frequency noise and offset by synchronous demodulation or phase-sensitive detection (PSD). The dual-channel lock-in amplifier also provides both resistive and capacitive information of the nanowire in separate channels. Measurement results of test resistors and capacitors show a 2% resolution in the resistance range 10-40 kΩ and a 3% resolution in the capacitance range 0.5-1.8 nF. Moreover, a 28.7-32.1 kΩ impedance variation was measured through the lock-in amplifier for a single palladium nanowire that was exposed to a decreasing hydrogen concentration (10% H₂ in N₂ to air). The chip has been implemented with UMC 0.18 μm CMOS technology and occupies an area of 2 mm². The power consumption of the readout circuit is 2 mW from a 1.8 V supply.     

应用新型荧光定量PCR技术检测FGFR2基因SNP

目的:探讨一种目前较为新颖的通过Rotor Gene-3000荧光定量PCR仪进行Tm-shifting荧光定量PCR扩增测定单核苷酸多态性(SNP)的可行性。方法:以913份乳腺肿物患者成纤维细胞生长因子受体2(FGFR2)基因rs2981582位点(T→C)作为研究对象,用荧光染料SYBR GreenI标记DNA,并在设计引物时在所研究基因的特异性引物5’末端连接上不同长度的尾,使不同基因型标本的PCR融解曲线的高峰出现在不同位置,最终可通过对PCR融解曲线的分析进行SNP分型测定。结果:纯合子C/C基因型融解曲线峰出现在≤84.60C处,特殊情况下稍向右偏移,但不超过85.10C,峰型较尖。纯合子T/T基因型融解曲线峰出现在≥87.50C处,特殊情况下稍向左偏移,但不小于870C,峰型较尖。杂合子T/C基因型融解曲线峰出现在前两者之间,峰型较平。结论:实验结果表明,用本方法检测大批量人群标本的SNP结果符合遗传平衡定律,且操作简便,检测耗时短,结果特异且费用较为低廉,适合于进行大规模样品的SNP快速测定。     

单目视觉空间移动靶位姿测量方法研究

为向室内定位技术定位精度及抗干扰能力提供高精度数据对比标准,提出单目视觉空间移动靶位姿测量方法。 结合机 器视觉投影矩阵求解与摄影测量后方交会技术,实现任意靶位姿下的相机外参数求解。 首先,通过世界坐标系下地面控制点坐 标及其像面坐标,计算真实相机站位;随后,根据靶点初始世界坐标及其实时像面坐标,求解虚拟相机站位;最后,根据虚拟及真 实相机站位外参数,将靶点初始世界坐标变换至靶点实时世界坐标。 实验结果表明,在 10 m×4. 5 m×3. 8 m 测量空间中,靶位 移距离测量误差 X 方向均方根误差(RMSE)为 0. 358 3 mm,Y 方向 RMSE 为 0. 350 9 mm,Z 方向 RMSE 为 1. 475 2 mm。 靶姿态 角 φ 测量 RMSE 为 0. 094 0°,ω 测量 RMSE 为 0. 089 3°,κ 测量 RMSE 为 0. 025 4°。 满足大范围移动载体的高精度实时定位定 姿需求。     

一种先进的短波实时选频和跳频通信控制器的设计和实现

本文首先论述了短波实时选频和跳频通信的工作机理；然后讨论了控制器的两个主要功能模块，并对其跳频通信技术和控制器硬件结构，软件实现方法作了较详尽的介绍；最后给出了实时选频和跳频通信系统的实际线路实验情况。     

一种专家控制器—设计原理和比较研究

本文应用人工智能原理中的问题归约技术设计了一种专家控制器.比较研究表明,该专家控制器是可行的,其控制性能比模糊控制器和 PI 调节器都要优越得多.文中所提出的控制归约与或图,实际上为设计专家控制器示范了一种形式化的方法。     

VLSI design and implementation of a real-time image segmentation processor

Image segmentation is a crucial part of machine vision applications. In this paper a system to perform real-time segmentation of images is presented. It uses a real-time segmentation VLSI chip that is based on a gradient relaxation algorithm and is designed using the Path Programmable Logic design methodology developed at the University of Utah. The system design considerations, system specifications, and an input/output format for the chip are discussed. The actual design of the chip is given that uses pipeline methodology to achieve real-time performance with a compact VLSI layout. The implementation of the segmentation system is presented and the segmentation chip and the overall system are evaluated with regard to real-time performance and segmentation results.This work was supported in part by Grant ISI-856-0393 from the National Science Foundation.