无线Mesh网络技术及其应用

作为一种新型无线技术,Mesh网络技术的拓扑结构、关键技术及应用领域一直以来备受关注。通过分析它的多级跳点系统拓扑结构,可以总结出它比传统无线网络具有更大的容量、速率和覆盖范围;它涉及了智能天线、MAC层多址访问等一系列关键技术,应用领域十分广泛。     

AOP在虚拟行为建模中的应用研究

该文介绍了对面向方面的思想和编程方法以及目前虚拟现实中各种行为造型的方法,并研究了AOP（Aspect Oriented Pro—gramming）思想应用到行为造型中的方法,将行为视为虚拟现实实体对象的方面,动态添加到实体对象中。最后阐述了在X3D中实现基于AOP的行为造型的方法和关键技术。还阐述了基于AOP的行为造型方法的在实际项目中的应用情况,充分验证了该方法的实用性和有效性。     

基于路径开销的机器人足球角色分配设计

小型足球机器人的决策系统是一个多智能体协调控制系统,主要由视觉信息处理、协调策略、角色分配、动作实现等组成.本文对角色分配机制进行研究,提出了一种路径开销组合最优的角色分配算法,实现了Play策略下动态角色分配的整体设计.仿真平台测试表明了机器人的整体配合能力有较大提高.     

Java卡对象共享安全策略分析与实现

使用形式化方法对Java智能卡的应用隔离与对象共享机制进行分析,用信任模型表述卡内多应用间对象共享关系,根据信任可传递的条件推断出仅由应用级安全策略控制共享对象访问的不足,提出以增加卡内全局访问控制机制来防止未经授权的信息流动这一安全策略设计思路,并给出一个简单实现。     

基于单片机的智能刹车控制系统设计与实现

为了避免误把油门当刹车的操作,减少交通事故发生率,设计实现了基于单片机的智能刹车控制系统;系统以STC89C58RD+单片机为核心,首先对踏板的加速信号进行采集,经循环判定阈值方法处理后输出信号,一部分输入到STC13C4053AD产生PWM信号驱动直流电机,另一部分输入RT13864M和ISD35130,模拟感官效果,并给出了系统的硬件电路和软件设计流程;测试证明,该系统能够对误踩油门进行有效控制,这对减少和避免交通事故,保障行车安全具有非常重要的现实意义和应用价值。     

Electron cryo-microscopy of biological specimens on conductive titanium-silicon metal glass films

Thin films of the metal glass Ti88Si12 were produced by evaporation and characterized by AFM and conductivity measurements. Thin Ti88Si12 support films for electron microscopy were prepared by coating standard EM grids with evaporated films floated off mica, and characterized by electron imaging and electron diffraction. At room temperature, the specific resistance of a thin TiSi film was 10(6) times lower than that of an amorphous carbon film. At 77K, the specific resistance of TiSi films decreased, whereas that of carbon became immeasurably high. The effective scattering cross-section of TiSi and amorphous carbon for 120 kV electrons is roughly equal, but TiSi films for routine use can be approximately 10 times thinner due to their high mechanical strength, so that they would contribute less background noise to the image. Electron diffraction of purple membrane on a TiSi substrate confirmed that the support film was amorphous, and indicated that the high-resolution order of the biological sample was preserved. Electron micrographs of TiSi films tilted by 45 degrees relative to the electron beam recorded at approximately 4 K indicated that the incidence of beam-induced movements was reduced by 50% compared to amorphous carbon film under the same conditions. The success rate of recording high-resolution images of purple membranes on TiSi films was close to 100%. We conclude that TiSi support films are ideal for high-resolution electron cryo-microscopy (cryo-EM) of biological specimens, as they reduce beam-induced movement significantly, due to their high electrical conductivity at low temperature and their favorable mechanical properties.     

考虑EV充放电意愿的园区综合能源系统双层优化调度

随着电动汽车的普及度越来越高,工业园区的电动汽车用户日益增多,其充放电行为对园区综合能源系统规划和运行带来极大挑战。本文提出了考虑电动汽车充放电意愿的园区综合能源系统双层优化调度。首先基于动态实时电价、电池荷电量、电池损耗补偿、额外参与激励等因素建立充放电意愿模型,在此基础上得到改进的电动汽车充放电模型;然后,以园区综合能源系统总成本最小和电动汽车充电费用最小为目标建立双层优化调度模型,通过KKT条件将内层模型转化为外层模型的约束条件,从而快速稳定的实现单层模型的求解;最后,进行仿真求解,设置3种不同场景,对比了所提模型与一般充放电意愿模型,验证了文中所提引入EV充放电意愿模型的园区综合能源系统双层优化调度的有效性和可行性,具有一定的经济效益。     

基于改进ECC的含电动汽车用户负荷信息保护方案

在智能电网的大趋势下,电力公司与用户之间的数据传输交换愈加频繁高效。通信网络经常遭受网络攻击或窃听,为确保用户的用电数据在传输过程中不被恶意篡改,提出一种面向电动汽车用户的信息保护方案。通过改进加法运算和标量乘运算对传统椭圆曲线加密算法（elliptic curve cryptography, ECC）做轻量级优化,克服电网双向互动环境中智能电表资源有限的问题。在此基础上,设计负荷分解算法作为加密方案的检验工具,分解加密后的电力数据。最后,通过仿真算例分析,验证了所提方案的可靠性和安全性。     

Ultrafast Switchable Passive Radiative Cooling Smart Windows with Synergistic Optical Modulation

Switchable passive radiative cooling (PRC) smart windows can modulate sunlight transmission and spontaneously emit heat to outer space through atmospheric transparent window, presenting great potential in building energy conservation. However, realizing stable and on-demand control of the cooling efficiency for PRC materials is still challenging. Herein, an electro-controlled polymer-dispersed liquid crystal (PDLC) smart window showing PRC property is designed and prepared by adding mid-infrared emitting reactive monomers into the conventional PDLC matrix. It is found that not only the electro-optical properties but also the PRC efficiency of PRC PDLC film are tunable by regulating the content of the mid-infrared emitting components, film thickness, and micromorphology. This advanced PRC PDLC material achieves a near/sub-ambient temperature when the solar irradiance is below 400 W m⁻² and can dynamically manage daytime cooling efficiency. Importantly, its PRC efficiency is capable of being tuned in an on-demand and ultrafast millisecond-scale way, whose controllable transparency enables multistage heat regulation. This study is hoped to provide new inspiration in the preparation of advanced optical devices and energy-efficient equipment.     

Electronic Auction Scheme Based on Smart Contract and IPFS

Sealed-bid auctions are a vital transaction tool in the e-commerce field. Traditional centralized auction schemes typically result in severe threats to data integrity,information transparency,and traceability owing to their excessive reliance on third parties,and blockchain-based auction schemes generally suffer from high storage costs and are deficient in functional and architectural design. To solve these problems,this study presents a sealed-bid auction scheme that removes the third-party bas...