基于超时违约概率约束的多天线系统下行帧长优化

为了满足数据传输的时延约束,提出一种多天线系统的下行帧长优化方案。由于传统的物理层信道模型在评估服务质量方面的局限性,该方案应用有效带宽与有效容量概念从链路层对源数据模式与队列服务动态进行统计特性建模。该链路层模型分别描述了源数据产生过程、信道服务过程与服务质量参数之间的映射关系,将超时违约概率约束转化为数据传输速率限制,将帧长优化问题转换为求解多元联合不等式组。在块衰落信道场景中,求解满足多元联合方程的帧长域下界,得到超时违约概率约束下的最佳系统帧长。理论分析和仿真结果表明,在最佳帧长设置下,用户数据传输的超时违约概率满足要求。     

流动图书车远程接入技术探讨——以广州少年儿童图书馆为例

针对公共图书馆流动图书车自动化系统远程接入所遇到的带宽受限难题，以广州少年儿童图书馆流动图书车远程接入实践为例，探讨当前网络环境下流动图书车远程接入的对策。     

多种网络业务并存的IEDF算法研究

文章以EDF算法为基础,提出一种改进的调度算法IEDF。在IEDF中,提出一种新的带宽调度策略,并在3种具体情况下进行业务流调度过程分析。同时,在SIM环境下进行仿真实验,仿真结果表明,和原EDF算法相比,IEDF算法有效保证了带宽,降低了时延,提升了Qos。     

支持动态搜索区域的运动估计硬件结构设计与优化

提出一种支持动态搜索区域的可变块大小运动估计硬件结构, 弥补固定大小搜索区域的不足, 可同时降低外存带宽、计算复杂度和功耗. 使用循环分布式存储结构来支持动态搜索区域的数据存取. 此外, 对耗时的SAD(sum of absolute differences)计算阵列进行均衡的流水线划分和加法逻辑优化. 实现结果表明, 相比同类设计, 该设计以少量的吞吐率损失, 换取面积效率和功耗效率的明显提高.     

带宽变化的链路分层共享和带宽重分配算法

为解决带宽变化状态下链路为不同用户共享时所面临的问题,提出适于带宽变化的分层链路共享和基于管理域的带宽重分配算法.该算法根据输出缓存测量反馈有效带宽来动态调整链路共享结构,可以屏蔽底层特性,满足向用户提供绝对带宽以及域间和类间的公平性.大量仿真试验验证该方法的可行性和合理性.     

GPON系统中动态带宽分配机制下的算法研究

GPON作为新一代的宽带无源光接入技术,具有共享网络的点到多点的运行结构。在数据传输过程中,改进的DBA算法在每个轮询周期开始前根据T—CONT1到T—CONT4业务的传输实时要求,完成本轮询周期内的带宽分配,同时将服务质量要求相同的业务放在OUN的一个T—CONT列队中,然后在上行帧中发送队列信息给OLT,以便OLT在下一个轮询周期开始之前完成额外带宽的分配,旨在提高带宽的利用率,更好地适应不同等级用户的带宽分配需求。     

Effects of the Instructional Set in the Bandwidth Feedback Paradigm on Motor Skill Acquisition

ABSTRACT

Purpose: This study examined the relationships between the Yo-Yo Intermittent Recovery Test level 1 (Yo-Yo IR1) and resting heart rate variability (HRV) and submaximal 5?-5? test derived measures in novice male soccer players. Methods: Forty players (11.54 ± 0.58 years) from a soccer academy participated in this study, performing physical tests on two different days, separated by 48 h, as follows: (day 1) resting HRV and Yo-Yo IR1 test, and (day 2) anthropometric assessments (for peak height velocity assessment [PHV]) and the 5?-5? test. The Pearson product-moment correlation coefficient was used to determine the correlations between Yo-Yo IR1 performance and the remaining variables. A partial correlation analysis was further performed using age, stature, body mass, distance to PHV, and age at PHV as “confounders.” Results: The highest correlation score was observed between Yo-Yo IR1 performance and resting HRV, when the absolute age was used as confounder (r = 0.72; p < .05). Conclusions: We observed that a practical measure of parasympathetic activity at rest is largely associated with performance obtained during a traditional intermittent endurance performance test.     

多网络出口链路并行技术的研究与应用

本文从中小规模校园网的网络出口带宽建设入手 ,提出了有效解决网络出口瓶颈的四个方案。利用网络地址翻译和基于策略的路由选择技术 ,在合理利用现有教育网资源的同时 ,引入电信提供的宽带高速接入服务 ,较好地解决了网络出口瓶颈问题     

Wavelength Channel Bandwidth of Wavelength—Selective Devices

Narrow bandwidth is a crocial factor in a high-performance wavelength-selective device(WSD).There are many different expressions to estimate bandwidths of many different WSDs.In this paper,we derive an important rule that the differential time delay between two coupling modes is the most important factor deciding the wavelength channel bandwidth for several different WSDs.This rule reveals that larger differential time delay between two coupling modes results in higher discrimination level of the operating wavelength.Based on the rule .a novel design of wavelength-selective coupler that has a bandwidth narrower than normal couplers is presented.