基于半字节CRC直驱表法的长线HOTLINK传输设计

针对在远距离高速传输中数据可靠性比较低的问题,提出了一种带半字节CRC直驱表法校验的高速长线HOTLINK数据传输系统设计,设计以 HOTLINK作为高速数据传输接口,将反馈纠错机制(ARQ)运用在传输系统中,并在逻辑设计上加入半字节CRC检错码,提高数据传输的可靠性,保证数据高速传输,经验证,数据能以400Ｍｂｉｔ /ｓ的速率,在由4段20ｍ射频同轴电缆组成的80ｍ传输线上可实现零误码率传输,有效保证远距离高速传输中数据的可靠性。     

一种面向互动投影的多目标跟踪方法

针对互动投影系统对多目标跟踪在自适应和实时性方面的需求,提出了一种基于自适应混合粒子滤波和自适应数据关联的多目标跟踪方法.该方法采用基于背景差检测的混合粒子滤波并将跟踪置信度引入目标的状态量中,根据跟踪置信度大小自适应地加强或减弱关联强度进行数据关联;同时,根据数据关联结果分析目标出现、目标消失、目标衍生、目标相遇等复杂运动情况,对每个目标进行自适应混合粒子滤波跟踪.实验证明该方法提高多目标跟踪性能,能够较好满足互动投影的应用需求.     

面齿轮材料18Cr2Ni4WA的飞秒激光精微烧蚀特性研究

飞秒激光精微烧蚀是一种新型的精密加工方法.本文研究了飞秒激光烧蚀面齿轮材料18Cr2Ni4WA的电子亚系统和晶格亚系统的能量耦合作用,建立了双温模型,采用有限差分法分析了脉冲宽度、平均功率对电子温度和晶格温度的影响规律.结果 表明:当电子与品格达到热平衡,且电子温度和晶格温度超过材料的熔点时,齿面产生烧蚀;当电子和晶格...     

A scheme of optical interconnection for super high speed parallel computer

An optical cross connection network which adopts coarse wavelength division multiplexing (CWDM) and data packet is introduced. It can be used to realize communication between multi-CPU and multi-MEM in parallel computing system. It provides an effective way to upgrade the capability of parallel computer by combining optical wavelength division multiplexing (WDM) and data packet switching technology. CWDM used in network construction, optical cross connection (OXC) based on optical switch arrays, and data packet format used in network construction were analyzed. We have also done the optimizing analysis of the number of optical switches needed in different scales of network in this paper. The architecture of the optical interconnection for 8 wavelength channels and 128 bits parallel transmission has been researched. Finally, a parallel transmission system with 4 nodes, 8 channels per node, has been designed.     

Optically pumped GaN/AlGaN quantum well intersubband terahertz laser

We propose an optically pumped nonpolar GaN/AlGaN quantum well (QW) active region design for terahertz (THz) lasing in the wavelength range of 30 μm～ 40 μm and operating at room temperature. The fast longitudinal optical (LO) phonon scattering in GaN/AlGaN QWs is used to depopulate the lower laser state, and more importantly, the large LO phonon energy is utilized to reduce the thermal population of the lasing states at high temperatures. The influences of temperature and pump intensity on gain and electron densities are investigated. Based on our simulations, we predict that with a sufficiently high pump intensity, a room temperature operated THz laser using a nonpolar GaN/AlGaN structure is realizable.     

残留边带调幅光缆电视光纤传输系统中的频道容量

与传统的电缆电视系统相比，残留边带调幅光缆电视光纤传输系统具有很大的优越性，因而对该系统的研究具有重要的产用意义。文中对ＭＡ－ＶＳＢＣＡＴＶ光纤传输系统的频道容量及其相关因素作了探讨，并导出了一些相关的计算公式。     

一种能有效支持QoS的光突发装配技术

提出了一种新的光突发装配技术，目的在于增强光突发交换(OBS)网络的服务质量(QoS)能力。该技术由自适应门限突发装配算法和基于优先级的随机化的偏移时间设置方案构成。该装配算法特别适合于多类别分组混合装配，能让所有类别的分组公平有效地使用装配能力，能较好地与IP层的QoS机制相匹配。偏移设置方案将突发控制分组(BCP)与突发数据(BP)间的偏移时间分成QoS偏移和随机偏移，前者由改进的JET协议按照有选择性的突发段丢弃机制(BSSD)确定，后者则由令牌桶机制确定。BSSD仅丢弃包含有低类别分组的突发段，而非整个突发。计算机仿真结果表明，本文提出的突发装配技术在性能上具有优越性。