Power reduction using adiabatic charge method for PDP driver circuit

Abstract— By applying an energy‐recovery method to their driver circuits, the circuit power consumption of plasma displays can be reduced. However, further power reduction is necessary for large‐sized higher‐resolution displays such as used for Super HDTV. The ideal adiabatic charge method has been proven to be able to minimize circuit resistive element power consumption to 81 % of the conventional energy‐recovery‐circuit resistive‐element loss. An experimental pseudo‐adiabatic charge circuit that reduces the power consumption to about 90% of a conventional circuit has been demonstrated. The power consumption caused by both the resistance loss and the discharge loss of the switching‐element parasitic capacitances was analyzed.     

Comparative study on the growth mechanisms of PAHs

The efficiencies of recently proposed, phenyl addition/cyclization (PAC), methyl addition/cyclization (MAC) and a popular hydrogen abstraction/acetylene addition (HACA) mechanisms have been examined experimentally by detecting the gas phase reaction products of pyrolysis of toluene with/without addition of benzene + acetylene by using vacuum ultraviolet (VUV) single photon ionization (SPI) time of flight mass spectrometry (TOFMS). Besides the observation of verities of large polycyclic aromatic hydrocarbons (PAHs), intense mass peaks of indene, phenylacetylene and propyne confirmed a remarkable quenching of the major active species, benzyl, phenyl and methyl radicals by acetylene. In spite of quenching, only benzyl contributed products were diminished while phenyl and methyl contributed products were enhanced. Uniquely observed symmetrical PAHs; corrannulene/coronene; formed by the active involvement of PAC, HACA and/or MAC mechanisms, reflects the interdependencies of these mechanisms. Individually, PAC was found highly efficient for endless growth, HACA for filling triple fusing site and MAC for expanding cyclotetra/pentafused into benzenoid structure, respectively.     

428XL网络无线桥的应用

428XL网络无线桥是一个75 Mb/s的无线数据链,可用来代替428XL交叉线。使用428XL网络无线桥可增强排列布设的灵活性,地震队借此能避开所有的地面障碍物来进行高效的野外作业。本文比较详细地介绍了428XL网络无线桥的组成,连接、参数设置、更改IP地址的方法,并详细阐述了其安装、使用过程中的注意事项。     

建筑防火与安全的标本兼治与综合治理

通过对国内外建筑节能中外墙外保温系统存在的防火安全问题的分析,从标准、规范、政策、监管及市场等方面论述了中国要完成＂十二五＂规划中提出的建筑节能总目标,在现阶段只能采用国内外通用的高效节能泡沫（EPS、XPS、PU）作主体保温材料。结合杨宗焜教授专家团队采用的化学结构改性技术,对走无卤化、结碳膨胀型难燃化技术路线研制的火焰传播性小,烟雾少、毒性小、耐燃性好,火焰贯穿强的难燃化的新型PU泡沫的技术特点、成果应用等进行了阐述,提出中国应结合国外发达国家相关规范及标准,尽快建立并完善中国式建筑节能保温系统中的防火安全技术标准,规范划分防火安全耐火性等级及市场规范,并最终实现标本兼治、综合治理的建筑防火安全目标。     

自适应低轨卫星MAC协议性能分析

针对低轨卫星通信信道碰撞检测能力弱,时延较长和大业务量的特点,提出一种具有接入控制机制的自适应APRMA MAC协议。通过对信道负载和业务优先级判断来确定不同业务的接入概率函数,并且接入概率在每个时隙中通过更新来动态适应系统资源的变化。该MAC协议确保多个终端合理共享有限的无线资源同时,系统能达到高容量。通过仿真对语音业务丢包概率、数据包平均时延和数据业务吞吐量三个衡量协议性能指标与传统协议进行分析对比,证明了APRMA MAC协议显著改善系统性能。     

无线传感器网络MAC协议研究与实现

一直以来,能量有效都是无线传感器网络MAC协议的研究重点。其中能量有效性比较好的如SMAC协议,采用周期性的睡眠机制可以很好的节约能量。然而,在SMAC协议中可能会由于一些节点遵守多个睡眠时间表,这就造成他们比其他节点更高的唤醒频率。因此,修改了原来的SMAC协议,使得所有节点尽可能的遵守一个时间表。修改后的协议延长网络的生存时间。通过仿真实验证明,该协议明显的提高网络寿命。     

Design and implementation of communication system of the Dawning 6000 supercomputer

An increasing number of supercomputers adopt a heterogeneous architecture, consisting of both general purpose CPUs and specialized accelerators. Such design is beneficial for scalability and power, but on the other hand, heterogeneity brings new challenges in communication systems to connect heterogeneous components and provide support for programming. The communication system of the Dawning 6000 connects two kinds of heterogeneous processors, Loongson and AMD, and adopts a three layer architecture with an intra-node layer between heterogeneous components. To efficiently connect heterogeneous components, the system forms a global address space and provides a mechanism for message transmission via an in-node global store; and employing Infiniband network, provides an OS-bypassing virtualization method to share an Infiniband card between nodes. To facilitate programming on heterogeneous processors, it supports unified parallel C (UPC), with a modified complier based on global address space. Also, a special collective network is implemented for collective operations. Results obtained from a prototype system prove these features to be both feasible and efficient.     

一种用于无线传感器网络的新联合优化算法

提出了一种跨MAC层和网络层的联合设计算法（IMR）,用于解决无线传感器网络中节约能量的问题。它能够迅速地对于频发性事件做出感知和报告,同时把能量消耗控制在一个较低的水平。IMR算法把一个监控区域划分为有一个汇聚节点的层次结构,以汇聚节点为中心进行数据传输。处于远端的节点通过不同层的中继节点将信息传输到汇聚节点。仿真结果表明,和S-MAC协议相比,提出的方法在节约能量方面明显优于前者。     

低延迟的能量有效无线传感器网络MAC机制

提出一种MAC机制,根据节点在路由路径上的位置调度节点,目的在于减少节点空闲侦听的能量消耗,同时减少因休眠引起的延迟。仿真结果表明该机制在保证能量有效的同时,也有助于减少延迟。     

等离子体显示器自适应低功耗寻址方法

摘要为降低等离子体显示器(PDP)的寻址功耗,在分析了AERCs,no-AERCs,以及IPS等寻址方法的原理和特点的基础上,提出了一种自适应低功耗寻址方法及其实现电路——自适应寻址能量恢复电路(AAERCs),同时也给出了寻址数据变化率的检测方法。AAERCs首先检测PDP各子场寻址数据的变化率,然后根据不同寻址方法中寻址功耗和寻址数据变化率的关系,计算出相应的寻址功耗,根据计算结果,自适应改变PDP的扫描时序和对应的寻址数据,使AAERCs始终工作在寻址功耗最低的模式下。50英寸WXGA双扫PDP的实验结果表明:对于任何图像,AAERCs的寻址功耗均低于现有的任何一种寻址方法,典型图案下,寻址功耗最大可节省81W。