TSM系统中高层软件测试的方法

任何一个软件，在开发过程中都不可避免地存在错误。软件测试的目的就是跟踪出软件的错误，不同种类的软件开发和测试工具是不相同的。介绍软件测试的基本概念、原理以及方法。主要介绍Telelogical Tau AB公司的TTCN的测试机理，并利用TTCN进行TSM(TD-SCDMA移动通信系统)高层信令测试的方法。     

基于重心的抗同步攻击的音频水印算法

抗同步攻击是音频水印领域公开的难题. 相对重心是音频的一个稳定的全局特征量, 对 TSM (Time scale modification)等同步攻击不敏感. 本文提出一种基于相对重心的抗同步攻击的音频水印算法,提出的算法通过量化音频的相对重心生成水印, 生成的水印由混沌序列加密后以量化的方法嵌入载体音频三级小波近似分量均值中. 为了降低同步攻击后同步位置的连续偏移, 水印嵌入提取过程采用了均匀分帧的方法. 实验结果表明提出的算法能抵抗常规信号处理操作, 同时 能抵抗20%的TSM操作(包含音调不变TSM和重采样操作)和 1/10的抖动操作, 有很好的鲁棒性.     

一种OSA/Parlay鉴权接口的安全性研究

本文讨论了基于TSM架构的OSA/Parlay框架,分析了TSM的OSA/Parlay框架中的鉴权安全性,结合现有的两种常用TSM安全分析模型的优点,提出了新的TSM正规模型,并用CoProVe对其进行追踪分析,发现了TSM协议安全上的不足,最后,提出了相应的解决方法。     

基于改进YOWO算法的学生课堂行为识别

当前, 大部分的学生课堂行为识别工作主要基于单帧图像进行, 忽略了行为的连贯性, 因此不能充分利用视频信息来对学生的课堂行为进行准确刻画. 所以, 本文提出一种改进的YOWO算法模型, 有效利用视频信息对学生课堂行为进行识别. 首先, 本文采集某高校真实课堂教学中的授课录像, 制作出包含5类学生课堂行为的AVA格式视频数据集; 其次, 采用时移模块TSM (temporal shift module), 用来增强模型获取时间上下文信息的能力; 最后, 采用非局部操作模块non-local来提高模型提取关键位置信息的能力. 实验结果表明, 通过对YOWO模型的优化, 使得网络的识别性能更佳. 在学生课堂行为数据集上, 改进后的算法的mAP值为95.7%, 相较于原YOWO算法在mAP值上提高了4.6%; 模型参数量为81.97×10⁶, 计算量为22.6 GFLOPs, 参数量和计算量分别降低32.3%和9.6%; 检测速度为24.03 f/s, 提升了约3 f/s.     

舰船湍流尾迹的数值模拟及其单站RCS计算

基于舰船湍流尾迹的半经验公式和双线性叠加方法, 分别模拟船尾射流尾迹和船侧涡流对尾迹, 与湍流实验结论比较, 验证了模拟结果的准确性以及方法的有效性.提出一种用双尺度模型结合物理光学法(Physical Optics, PO)计算粗糙面电磁散射的方法, 应用该方法计算风驱海面杂波雷达散射截面(Radar Cross-Section, RCS)并与双尺度方法(Two Scale Method, TSM)的计算结果和实测数据比较, 吻合得较好, 验证了该方法的正确性.应用该方法计算湍流尾迹的雷达散射截面, 为数值模拟舰船尾迹的合成孔径雷达图像奠定了基础.     

联合采用多代理和禁忌方法的系统恢复策略

将多代理技术MAT的分布式信息处理和禁忌方法TSM有机结合,形成了一种新型分布式电力系统恢复模型。模型由多结点智能代理GIAGs(crunode intelligent agents)和一个智能控制代理ICAG(intelligent control agent)组成,通过多个CIAGs间交互协商处理及ICAG的基于TSM的协同求解,能够实现快速恢复决策。仿真结果表明,该模型不仅能够快速获得恢复优化策略,而且对网络拓扑结构变化具有较强的适应性。     

优先级有限时的单处理器静态优先级调度

静态优先级调度在实际应用中经常受到系统支持的优先级个数的影响,当任务个数多于系统优先级个数时,需要将几个任务优先级映射成一个系统优先级.这可能引起优先级映射问题,使映射前可调度的系统(任务集合)在映射后变得不可调度.解决这一问题需要减少时间复杂度的映射算法和判定映射后任务可调度性的充分必要条件主要存在3种映射算法:(1)按照任务优先级递减顺序进行映射的DPA(decreasing priority assignment)算法;(2)按照优先级递增顺序进行映射的IPA(Increasing priority assignment)算法;(3)阈值段间映射法(thresh01d segment mapping,简称TSM).描述了3种算法的实现和判定条件,论述并证明了算法特性,分析并通过仿真实验比较了算法的性能,最后总结了3种算法各自的适用场合.比较结果和结论对实时嵌入式系统的设计和实现具有一定的参考价值.     

Calibration and validation of a generic multisensor algorithm for mapping of total suspended matter in turbid waters

Mapping of total suspended matter concentration (TSM) can be achieved from space-based optical sensors and has growing applications related to sediment transport. A TSM algorithm is developed here for turbid waters, suitable for any ocean colour sensor including MERIS, MODIS and SeaWiFS. Theory shows that use of a single band provides a robust and TSM-sensitive algorithm provided the band is chosen appropriately. Hyperspectral calibration is made using seaborne TSM and reflectance spectra collected in the southern North Sea. Two versions of the algorithm are considered: one which gives directly TSM from reflectance, the other uses the reflectance model of Park and Ruddick (2005) to take account of bidirectional effects.Applying a non-linear regression analysis to the calibration data set gave relative errors in TSM estimation less than 30% in the spectral range 670-750 nm. Validation of this algorithm for MODIS and MERIS retrieved reflectances with concurrent in situ measurements gave the lowest relative errors in TSM estimates, less than 40%, for MODIS bands 667 nm and 678 nm and for MERIS bands 665 nm and 681 nm. Consistency of the approach in a multisensor context (SeaWiFS, MERIS, and MODIS) is demonstrated both for single point time series and for individual images.     

A review: Energy recovery in batch processes

The implementation of batch processing has increased due to its intrinsic flexibility and adaptability. These are essential characteristics when it comes to producing high-value added materials such as agrochemicals, pharmaceuticals, specialty chemicals…the demand for which has grown in recent decades.Although industrial processes are highly diverse, a common feature to all is that they utilize fossil fuels as the energy source. The reliance on fossil fuels as a primary source of energy generates a negative impact on the environment. The implantation of renewable energies and efficient usage of energy has thus become crucial. Improving energy use could be achieved through advancements in plant machinery and the use of methodologies such as ‘process integration’.Process integration can be described as system oriented methods that could be used during the design and retrofit of industrial processes in order to obtain an optimal utilization of resources. The methods have traditionally focused on an efficient energy use, although recently process integration techniques cover other areas such as efficient use of raw materials, emission reduction and process operations. Energy integration tries to reach the optimization of heat, power, fuel and utilities.The consideration of energy integration complicates the process design and the generation of batch process design alternatives, so what is now required is the proposal and development of different approaches and methods oriented towards recovering energy in this kind of industrial process. Improving energy end-use efficiency will make it possible to reduce dependence on energy imports and bring about innovation and competitiveness.The aim of this work is report the main contributions that have been carried out in order to attain energy integration in batch processes, as well as different examples of applications that have shown the possibilities offered by the developed tools.     

基于TSM102的高效率铅酸蓄电池充电器设计

针对当前市场上流行的铅酸蓄电池充电器充电效率过低,开关器件消耗的热功率过大,投入在散热装置上的成本过高,充电器体积太大等多种弊端,提出一种新型的低成本、高效率铅酸蓄电池充电器设计方案。