基于ARM7的无线传感器网络节点能量管理初探

为了研究无线传感器网络能量管理和组网技术，采用ARM基高性能、低功耗微控制器LPC2138为核心制作了一种新型无线传感器网络节点，该节点由两节AA电池供电。说明了该节点的硬件构成及设计方法，介绍了该无线传感器网络节点使用的电池模型，并给出了一组该节点有效工作状态下的功率。     

休眠唤醒节能技术在Zigbee网络中的应用

随着Zigbee技术的不断成熟,其应用领域得到不断地扩展。Zigbee节点通常采用电池供电,节点的能量供应非常有限,而在某些应用中对电池进行充电或者更换电池也是不切实际的,增加了网络的维护难度和成本。文章基于Zigbee无线通信技术,采用休眠唤醒的节能技术,主要用于周期性的采集传输系统中。系统采用休眠唤醒节能技术降低Zigbee节点的能量消耗,提高供电电池的使用效率,延长Zigbee网络的使用时间。     

基于ARM7的无线传感器网络节点能量管理初探

为了研究无线传感器网络能量管理和组网技术,采用ARM基高性能、低功耗微控制器LPC2138为核心制作了一种新型无线传感器网络节点,该节点由两节AA电池供电。说明了该节点的硬件构成及设计方法,介绍了该无线传感器网络节点使用的电池模型,并给出了一组该节点有效工作状态下的功率。     

基于ARM7的无线传感器网络节点能量管理初探

为了研究无线传感器网络能量管理和组网技术,采用ARM基高性能、低功耗微控制器LPC2138为核心制作了一种新型无线传感器网络节点,该节点由两节AA电池供电.说明了该节点的硬件构成及设计方法,介绍了该无线传感器网络节点使用的电池模型,并给出了一组该节点有效工作状态下的功率.     

基于网络编码的水下传感器可靠传输技术

网络编码技术可以极大的提高网络的吞吐量，同时能提高网络的鲁棒性。为了提高水下传感器网络数据传输的可靠性，利用网络编码对消息的备份性进行能量收集。该方案节省了电池能量，提高水下传感器节点的生存周期。     

MANET中一种基于Agent的能量节约方案

MANET是一种没有中心的特殊的移动自组织网络,由于节点依赖于电池,能量有限,因此节能是一个重要问题。文中提出的了一种基于Agent的能量节约方案,首先通过较少的移动Agent传递网络中节点的信息;然后根据各节点电池余量等参数,选择最合适的路径进行数据传输。从而可以节省整个网络的能耗,并保护剩余能量低的节点。实验结果表明这种方案可以延长整个网络的生存时间。     

无线传感器网络中的供电新技术

无线传感器网络作为一种由大量传感器节点构成的特殊网络,主要用于数据的采集和传输,供电技术是其发展的关键技术,探讨了其中的新型电池、能量采集以及电源的智能控制技术三个方面的最新动态。     

无线体域网内节点的NDC3功率控制方案

通信技术的发展、生理传感技术的进步和日益增长的人体生理信息跟踪需求等催生了无线体域网,作为传感器网络的一个分支,其日渐成为研究的重点。动态功率控制技术作为传感器网络的重要技术之一,在保证传输包质量的同时可以最大化地节省节点电量。特别地,由于节点电池不易更换,所以WBAN是能量受限网络。因此合理调整WBAN中节点的传输功率可以延长设备的生命长度,使其可以长期持续地监测人体的健康。     

一种射频能量捕获网络移动能量源均衡化充电策略

为解决传统电池供电传感器网络存在的电池不易更换、节点能量容易耗尽等问题,射频能量捕获技术已逐步应用于无线可充电传感器网络中.由于不同位置传感器节点的工作负荷不同,捕获能量也有差异,实现节点能量的均衡化分布可以有效地提高节点的存活率.考虑射频能量源移动充电的场景,在已知节点位置信息的条件下,设计合理均衡的路由方案和充电算法.首先将区域基于蜂窝六边形网格划分,分别对网格和节点分层,提出逐层传输的均衡式路由策略,然后给出无线充电小车的移动路径,对相邻两层内节点剩余能量的方差最小化问题建模,由内层向外层依次确定能量源在各停留点的充电时间.仿真结果表明,相比已有的均衡化充电方法,该策略可以明显提高节点剩余能量的均衡性,从而延长网络的生命周期.     

基于无线传感器网络的粮情监测系统

根据粮库的实际要求,应用无线传感器网络技术,设计了树状网络和星型网络相结合的两级网络结构的粮情监测系统,并在此基础上设计了适于粮情监测的MAC层协议,在降低通信协议复杂度的同时实现了可靠通信和降低节点功耗的目的.经过测试,节点的一次性唤醒率为95%,使用两节1.5V的5号电池能使节点连续工作5年以上.     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first