基于定位与姿态感知的虚实漫游方法应用研究

随着虚拟现实技术的成熟,文化遗产数字化保护与传承越来越受到人们的关注。 通过GPS 定位与移动终端的结合,实现智能移动终端GPS 在展示古迹废墟遗址方面的优势。 具体方法是,首先通过数据转换,建立虚拟场景与真实场景的区域映射;然后使用陀螺仪将摄 像机的角度与智能移动终端绑定,建立虚拟角色与现实角色的姿态映射,最后通过Unity3D 插 件包实现虚实漫游功能,打破时间与空间限制,丰富展示作品的信息量与趣味性,并提供一种 个性化的文化遗产场景浏览模式,可应用于遗址废墟如圆明园场景。     

A Critical Note on the Application of Analysis of Variance Techniques in Ergonomics Research

A survey was made of the statistical techniques used in 108 papers appearing in Ergonomics between 1969 and 1971. It was found that analysis of variance techniques had been misapplied in many cases, sometimes with potentially serious consequences. The major criticisms concern the use of inappropriate error terms, the inadequate consideration of some of the assumptions involved in repeated measures and other designs, and the omission of a posteriori tests.     

Winsock在C~3I系统分布式仿真中的应用

利用Winsock 来实现C3I系统仿真中的网络数据传输,模拟雷达产生数据与传输数据的过程,初步实现C3I系统的分布式仿真。     

免疫检测模型中检测器的激励响应机制研究

文章研究与借鉴免疫系统中B细胞的生成、演化和检测的过程,针对当前IDS免疫模型研究中存在的不足,提出了检测器在不同检测阶段中的演变形式和行为方式,并给出了检测器的异常触发、活化概率函数以及相互间激励或抑制的算法与机制,同时针对活化响应发生链式反应、检测器的识别域之间交迭覆盖以及检测器规模等问题,建立了优先权和率先活化机制．实验结果验证了检测器激励响应机制一方面实现了检测器动态更新和联想记忆的功能,另一方面摒弃了盲目地随机产生检测器的传统方式,提高了免疫检测模型的自学习和自适应的能力．     

线性调频信号的一种新的频域脉压处理方法

线性调频波形由于多普勒性能突出，一直是一种在雷达中具有广泛应用的脉冲压缩波形，但是线性调频的距离旁瓣不够理想，强目标的旁瓣过高就有可能淹没弱目标的主瓣。该文根据线性调频信号的频谱结构，采用频域数字处理技术，提出了一种新的基于理想压缩脉冲的频域滤波器（SSF）设计方法，导出了可实现低的压缩脉冲距离旁瓣的条件。与其它方法相比，线性凋频信号由该文方法压缩后主副瓣比得到很大的提高，并且主瓣不会展宽，因此不影响距离分辨力。通过数学公式推导和计算机仿真表明，所提出的方法是正确的和可行的，而且步骤简单，运算量小，易于实现。     

An adaptive low-dimensional control to compensate for actuator redundancy and FES-induced muscle fatigue in a hybrid neuroprosthesis

To restore walking and standing function in persons with paraplegia, a hybrid walking neuroprosthesis that combines a powered exoskeleton and functional electrical stimulation (FES) can be more advantageous than sole FES or powered exoskeleton technologies. However, the hybrid actuation structure introduces certain control challenges: actuator redundancy, cascaded muscle activation dynamics, FES-induced muscle fatigue, and unmeasurable states. In this paper, a human motor control inspired control scheme is combined with a dynamic surface control method to overcome these challenges. The new controller has an adaptive muscle synergy-based feedforward component which requires a fewer number of control signals to actuate multiple effectors in a hybrid neuroprosthesis. In addition, the feedforward component has an inverse fatigue signal to counteract the effects of the muscle fatigue. A dynamic surface control (DSC) method is used to deal with the cascaded actuation dynamics without the need for acceleration signals. The DSC structure was modified with a delay compensation term to deal with the electromechanical delays due to FES. A model based estimator is used to estimate the unmeasurable fatigue and actuator activation signals. The development of the controller and a Lyapunov stability analysis, which yielded semi-global uniformly ultimately boundedness, are presented in the paper. Computer simulations were performed to test the new controller on a 2 degrees of freedom fixed hip model after which preliminary experiments were conducted on one able-bodied male subject in the fixed hip configuration.     

基于数据抽取的相参脉冲串载频精确估计方法

利用相参脉冲串信号的相位相干特性,提出一种利用FFT和数据抽取技术的精确测量载频的新方法。该方法利用数毫秒信号,达到了亚kHz量级的频率估计精度和数十Hz量级的频率分辨能力。仿真试验验证了该方法的频率精确测量能力和频率高分辨能力。     

Timing is everything: using fluidics to understand the role of temporal dynamics in cellular systems

In biology, it is not only the magnitude of a chemical stimulus that determines cellular response; it is becoming increasingly clear that the timing of the stimulus is vastly important as well. Currently there is a paucity of data regarding cell behavior under dynamic stimulation conditions that are representative of what occurs in vivo. This is, at least in part, attributed to the lack of appropriate tools for generating time-varying stimulatory signals in highly diverse patterns. Fluidics on the macro and micro scale has provided a practical platform for dynamically stimulating cells in a highly controllable manner at physiological and supra-physiological time scales (seconds to a few hours). These fluidic systems have contributed substantially to our understanding of how cells process and react to dynamic stimulatory environments; while these setups provide the means to analyze and manipulate cellular behavior in these types of environments on the single-cell level and on a high-throughput level, improvements can be made to these platforms to enhance their utility for high-impact biological investigations of temporal dynamics.     

基于PC声卡的电网电源频率精密测试方法

通过对频率测量方法的研究，提出了一种用PC声卡精密测试电网电源频率的新方法，并给出了误差分析，可达到低成本精密测试电网电源频率的目的，实践证明该方法具有实际应用的价值。     

一种计算空间封闭曲面正侧法向量的方法

在三维物体表面光照处理,三维曲面上曲线所围区域的计算以及三维物体体积计算等应用中,需要计算曲面正侧法向量,针对三角形网格表示的空间封闭曲面,本文设计了一种计算曲面正侧法的向量的简明算法。     

一种微悬臂梁疲劳特性的检测方法

关于MEMS结构疲劳特性的研究报道中,典型的研究疲劳的方法是基于观测裂纹的产生和扩展的,如一种扇型梳壮驱动器用来产生循环的拉压作用,以此可以观察Si梁结构的裂纹的扩展情况.该方法采用渐变参量的方法来描述疲劳现象,如参量平均杨氏模量E,而且提出了一种利用检测电容来达到疲劳特性描述的测试结构.该电容和由于作用力让梁产生的位移之间有关.通过检测到的电容值,计算平均杨氏模量E以此来反映这种简单的MEMS结构的疲劳特性,最后,这种方法通过ANSYS进行验证.     

一种区域型高频图像噪声的无损滤除方法

从构建图像各点强度变化的频率入手,借助领域知识和经验,展开对历史样本的针对性分析,提取出对区域型跳变噪声敏感的分类特征和分类阈值,再找出辨析两类交叠区中非噪声点的特征,设计两种特征的联合使用方案,成功实现了在不损伤图像中有效信息的前提下的区域型跳变且随时间移动缓慢的噪声的滤除。实验验证了算法的有效性和可靠性。     

A Necessary Condition about the Optimum Partition on a Finite Set of Samples and Its Application to Clustering Analysis

1IntroductionAsusedforclusteringanalysis,K-meansclusteringalgorithmhasbeenwidelyaPpliedindatacompression,characterextractionofpatternandcommunication-ConsideringthatK-meansclusteringalgorithmisadatacompressionmethodwithloss,wehopetominimizethelossundersomeconstraints,whichmaybringforththeoptimumdesigningofK-partition(orclusteringcenters).ThesequentialhardK-means(SHKM)isanoldclusteringapproach.TheMacQueen'sSHKMl1]algorithmwaspresentedin1967.Ref.[2]proposesamodifiedformtofindtheinitialclu…     

汉语词性标注排歧方法探讨

该文将概率统计的二元模型与三元模型用于汉语词性自动标注,在算法为线性阶的时间复杂度的情况下,对20万训练集和1万的测试集,分别进行封闭测试和开放测试,对稀疏矩阵零元素及词性标注的结果做了统计分析。     

VOR系统的一种中频数字信号处理方法

针对现代无线电导航系统中对于处理速度,性能指标等越来越高的要求,为了使系统数字化、小型化,提出应用于甚高频全向信标系统(VOR)系统的中频数字信号处理方法,详细介绍了此算法的设计思想和摹本原理;同时提出了一种改进的FM数字化解调算法,可以较好地用于软件无线电的体系结构中.计算机仿真结果表明,跟传统的VOR系统信号处理算法相比,新算法可以在中频直接完成VOR方位信号的信息解调等处理,具有处理灵活、不受频差和相差影响等优点.系统的综合处理能力得到了提升.     

A Necessary Condition about the Optimum Partition on a Finite Set of Samples and Its Application to Clustering Analysis

This paper presents another necessary condition about the optimum partition on a finite set of samples.From this condition,a corresponding generalized sequential hard k-means (GSHKM) clustering algorithm is built and many well-known clustering algorithms are found to be included in it.Under some assumptions the well-known MacQueen;s SHKM (Sequential Hard K-Means) algorithm,FSCL(Frequency Sensitive Competitive Learning) algorithm and RPCL (Rival Penalized Competitive Learning) algorithm are derived.It is shown that FSCL in fact still belongs to the kind of GSHKM clustering algorithm and is more suitable for producing means of K-partition of sample data,which is illustrated by numerical experiment.Meanwhile,some improvements on these algorithms are also given.     

一类无证书签名方案的构造方法

无证书密码体制(CL-PKC)是一类新型公钥密码体制.它保持了基于身份的密码体制(ID-PKC)不需要使用公钥证书的优点,又较好地解决了基于身份的公钥体制所固有的密钥托管问题.对无证书体制下安全高效的签名方案的设计方法的研究是受到高度关注的研究课题.文中给出了一类无证书签名方案的构造方法,并在一个很强的安全模型下对用该方法所构造的方案的安全性进行了证明.文中对新构造的方案与已有的一些同类方案的性能进行了比较.结果显示新方案在整体性能上有一定的优势.     

一种软件实现RFID系统ASK信号解码的方法

RFID设计中的核心技术之一是实现对电子标签返回信号的解码,作者分析和研究了基于ISO/ICE 15693标准的RFID系统中ASK模式响应信号的软件解码方法,在基于DSP芯片设计的读写器硬件基础上,采用了＂波形追踪＂的算法,充分利用DSP芯片的信号处理和运算能力,以软件方式实现了对电子标签返回的ASK响应信号的解码工作。使用效果表明该算法具有解码准确率高、速度快、工作稳定等优点。     

一种用Visual FoxPro求频繁项目集的方法

采掘关联规则是数据采掘领域的一个重要问题,依据Apriori算法,提出了一种用Visual FoxPro求频繁项目集的方法,并用Visual Foxpro编写了求1－6项目频繁集的程序。     

多变量控制系统结构图的瞬态响应模式分析法

本文研究用结构图表示的多变量控制系统.在各种控制或扰动信号作用下,系统各环节输出的瞬态响应模式.