Single display gamut size metric

To measure the relative gamut sizes of wide‐gamut displays, it is herein proposed that the CIE 1931 xy chromaticity diagram be used rather than the nominally perceptually uniform CIE 1976 u′v′ chromaticity diagram. High correlations were found between the area‐coverage ratios in the xy diagram and the volume‐coverage ratios in the CIE 1976 L^*a^*b^* color space for major standard wide‐gamut color spaces. It is also demonstrated herein that performing planimetry in the uniform u′v′ diagram does not yield accurate relative display gamut sizes, even though the large sizes obtained using the u′v′ diagram are often reported regardless of the fact that its uniformity is valid only when the luminance factor is constant. The single display gamut size metric using the xy diagram will facilitate the unbiased development of wide‐gamut displays.     

公交车的远卡自动收费系统设计

在对公交收费系统的发展和无线射频识别技术进行研究的基础上,分析了现行公交收费系统的优缺点与局限性,并提出了一种公交车远卡自动收费系统的设计思路.主要使用ARM核芯片STM32、射频芯片nRF24LE1等器件,完成了硬件设计.在软件设计上实现了自动计算票价的扣费机制.该系统创新性地将远距离射频技术应用在公交收费系统中,不仅方便了乘客,而且大大提高了乘客上下车的效率.     

磁共振多通道射频接收线圈性能评估

磁共振成像技术追求高信噪比和快速扫描。与单通道线圈相比,多通道线圈具有高信噪比、高分辨率和成像速度快的特点。为服务于射频线圈设计和制作,开发了基于磁共振k空间数据的多通道射频线圈性能评估软件。此软件可以准确方便地计算多通道线圈噪声耦合矩阵和信噪比。     

A Maximum Principle via Malliavin calculus for combined stochastic control and impulse control of forward‐backward systems

We consider a combined stochastic control and impulse control problem of forward‐backward systems driven by Lévy processes, where both the system coefficients and the objective performance functional are allowed to be random, non‐Markovian; the information available to the controller is partial information. Applying a Malliavin calculus approach, we derive a maximum principle for this control problem, where the adjoint processes are explicitly represented by the parameters and the states of the system. Finally, we give two examples of applications. © 2015 Chinese Automatic Control Society and Wiley Publishing Asia Pty Ltd     

矿井物流管理和人员定位系统数据库设计

针对矿井物流管理系统与矿井人员定位系统独立运行导致的成本高、维护困难等问题,提出将2个系统进行相互融合、统一管理的方式,并采用射频识别技术和Microsoft SQL Server 2008数据库软件,设计了一种矿井物流管理和人员定位系统,着重介绍了需求分析及逻辑结构设计阶段的系统数据库设计方案,并给出了主要运输流程数据库表的映射关系。该数据库逻辑结构简单、清晰,具有良好的存储结构、数据共享性和一致性。实际应用表明,该数据库具有较高的实用性和可靠性。     

应用虚拟仪器技术的超高频 RFID 读写器设计*

射频识别技术在资产管理领域中逐渐受到青睐,针对现有识别技术开发周期长、测试速度慢的弊端,论文提出采用虚拟仪器和数字信号处理技术,结合自定义超高频协议,研究了一种新的读写器系统。该系统用软件代替硬件实现超高频射频识别,能对超高频RFID标签自动测试,能够实现电子标签从物理层到应用层的一致性测试,能对多种宏观参数测量和分析。实验结果表明,该系统在单标签及多标签的情况下能克服单一标准的限制,很好地模拟读写器调制、解调、编码、解码、循环冗余校验、逻辑控制等基本功能,具有成本低、集成度高和扩展性好等优势。     

基于FPGA＋DSP的跳频电台传输系统

高速率跳频、高带宽技术是提高跳频发射机性能的关键,本文结合软件无线电思想和架构,提出一种基于FPGA＋DSP的跳频电台传输系统的设计方案,该系统兼容多种调制方式和跳频速率及数码率。系统采用上下变频器作为系统基带信号与中频信号之间的频率转换器,还给出了系统电路原理图和程序流程图。     

大采高综放开采煤岩损伤统计力学模型

根据特厚煤层大采高综放开采煤壁前方支承压力的分布特征,从煤岩内部缺陷的随机性分布特征出发,基于反映煤岩内部缺陷的微元强度服从韦布分布的概念,建立了支承压力作用下煤岩的损伤统计力学模型,确定了特厚煤层大采高综放面在煤壁片帮不影响生产的情况下的合理采高,并分析了特厚煤层大采高综放面合理采高与煤壁片帮程度、煤层内摩擦角、煤层...     

Dynamically reconfigurable radio-over-fiber network with medium access control protocol to provide network access to train passengers

An innovative dynamically reconfgurable radio-over-fber(RoF)network equipped with an intelligent medium access control(MAC)protocol is proposed to provide broadband access to train passengers in railway high-speed mobile applications.The proposed RoF network architecture is based on a reconfgurable control station and remote access unit(RAU)that is equipped with a fxed flter and tunable flter.The proposed hybrid frequency-division multiplexing/time division multiple access(FDM/TDMA)based MAC protocol realizes failure detection/recovery and dynamic wavelength allocation to remote access units.Simulation result shows that with the proposed MAC protocol,the control station can detect failures and recover and dynamic wavelength allocation can increase the wavelength resource utilization to maintain network performance.     

A reservoir serves as refuge for adults of the endangered Macquarie perch

Home‐range estimates are an important input to species recovery plans. Our aim was to estimate the home‐range size of the endangered Macquarie Perch in the lower Cotter River catchment, Australia. In total, fourteen home‐range estimates were calculated from intensive radio‐tracking of adult individuals over a minimum of five diel periods in either autumn (n = 5) or spring (n = 9). Home‐range (95% Kernel) and core area (50% Kernel) were calculated by Kernel estimation and corrected for overlap with land. Seasonal estimates of home‐range and core area were not asymptotic in relation to cumulative number of radio‐fixes in four of fourteen cases. The mean within‐season home‐range of adult Macquarie perch was 5.5 ha ranging from 0.2 to 18.4 ha, based on 10 cumulative estimates that were asymptotic in relation to radio‐tracking effort. All five individuals radio‐tracked in autumn occupied a single core area, whereas in spring, six individuals occupied a single core area and three individuals each occupied three core areas. Despite individuals moving on a scale almost comparable to Cotter Reservoir (48.5 ha), only a single radio‐tagged individual was found to leave the reservoir and enter the river. Regional fisheries managers are generally aware of the requirement for Macquarie perch to access flowing water for spawning in south‐eastern Australia; however, in the Cotter River catchment, the protection of habitat for this species within Cotter Reservoir is also paramount. Our study highlights the importance of reservoirs for conserving a threatened aquatic species.