Content subscribing mechanism in P2P streaming based on gamma distribution prediction

P2P systems are categorized into tree-based and mesh-based systems according to their topologies. Mesh-based systems are considered more suitable for large-scale Internet applications, but require optimization on latency issue. This paper proposes a content subscribing mechanism (CSM) to eliminate unnecessary time delays during data relaying. A node can send content data to its neighbors as soon as it receives the data segment. No additional time is taken during the interactive stages prior to data segment transmission of streaming content. CSM consists of three steps. First, every node records its historical segments latency, and adopts gamma distribution, which possesses powerful expression ability, to express latency statistics. Second, a node predicts subscribing success ratio of every neighbor by comparing the gamma distribution parameters of the node and its neighbors before selecting a neighbor node to subscribe a data segment. The above steps would not increase latency as they are executed before the data segments are ready at the neighbor nodes. Finally, the node, which was subscribed to, sends the subscribed data segment to the subscriber immediately when it has the data segment. Experiments show that CSM significantly reduces the content data transmission latency.     

Design and research of gymnasium structure in Zhejiang University

INTRODUCTION The gymnasium project located in the newcampus of Zhejiang University is a symbol building(Fig.1). The requirements on the functions and theesthetics make it distinguished from a traditionalgymnasium. It is a two-story building with the firstfloor used for field competition and the second floorfor students’ basketball training. The heavy live loadsacting on the second floor and the requirement of 35m unobstructed space challenge the creativity of thestructural enginee…     

对偶线性规划问题性质探析

探讨对偶线性规划的原始问题与对偶问题的属性，阐述两者的区别和内在联系，用较简便的方法论证其重要性质，揭示可行解与目标函数、可行解与最优解的关系，指出线性规划问题最优解从约事条件较少的对偶问题寻求为另一较简便之方法。     

论篮球比赛中篮板球的作用

在篮球比赛中,篮板球是争夺球权的重要手段,是攻守转化和比赛胜负的关键,也是衡量运动员个人和全队整体实力的标志．通过对抢篮板球的意识,抢篮板球的能力的论述,进一步证明篮板球在比赛中起着至关重要的作用．     

社会化机器人引发人的情感认同问题探析——人机交互的视角

在“人-机”互动中,人对社会化机器人在情感上产生某种“依归”,对人的情感认同造成深层次影响。这种影响包括:人对情感交互对象产生“虚假”认识导致情感认同的“真实性”不再真实;人产生“伪”安全依恋导致情感认同的“安全性”不再安全;人的情感“收益”的“单向度”导致情感认同的“对等性”不再对等。究其原因,首先是社会化机器人在某种程度上可以“显化”为“人”,从而“模糊”了生命的界限;其次是在“人-机”这一新型情感交互中,人缺乏审度地将自身“交付”于机器人;再次是“人-机”体系存在着难以克服的三重局限性。     

"新工科"背景下冶金工程专业人才培养体系探索

本文以苏州大学冶金工程专业"新工科"建设为背景,论述了学科交叉融合的必要性和紧迫性,构建了以冶金基本原理为核心,以工艺开发、设备认知、检测技术、控制技术、模型算法、工程管理为辅助的课程体系,强化虚拟仿真、工程实践和融合训练,"头脑风暴"贯穿教育全过程,着力培养厚基础、宽领域、重应用、懂管理的复合型工程技术人才.     

《交通运输布局对区域发展的影响》教学浅谈——以震泽古镇为例

《普通高中地理课程标准(人教版)》强调要重视学生地理学科核心素养的培养,培养学生自主发现问题、分析问题、解决问题的能力。本文选择高中地理人教版第二册第四章《交通运输布局对区域发展的影响》为教学案例,试图将该章节的内容跟新版地理课程标准对接起来,研究怎样利用课外的地理素材进行课程设计,激发学生的自主探究思维,培育学生的地理核心素养。     

课堂教学热度与深度的调控探讨——以“内能”教学的重点突破设计为例

本文从课堂教学热度与深度的调控入手,对苏科版物理"内能"教学的"设计意图、施教过程、调控反思"进行探讨。设计意图按"教材分析、教学策略"展开;施教过程围绕"情感趣点、认知起点、思维难点、教学重点、智慧亮点"这五个片段进行探索;调控反思则立足"热度调控须立足于学生的情感体验、深度调控应有利于学生的智慧成长"进行探讨。     

基于双S7-200PLC供热管网首站换热器温度控制系统设计

以某热力管网首站的换热器为研究对象,采用西门子两个S7-200PLC的主从结构的方式来解决PLC外部I/O端子较多的问题,并采用Eview5000触摸屏作为系统上位机,利用PID TuneControl Panel实现了对四个换热器的温度控制,具有手动/自动两种控制方式,其控制精度达到了预定的要求,且系统成本低廉、界面友好、控制灵活。     

179阶SRRC滤波器的设计与仿真

以DTTB系统中采用的SRRC滤波器为例,介绍一种利用分布式算法与多相分解开关结构相结合的SRRC滤波器的FPGA实现方法。最后利用Matlab验证,通过与169阶滤波器相比较,分析误差来满足国标对基带滤波的要求。