Driving behavior recognition and prediction based on Bayesian model

Since the existing intelligent driving systems are lack of efficiency and accuracy when processing huge number of driving data,a brand new approach of processing driving data was developed to identify and predicate human driving behavior based on Bayesian model.The approach was proposed to take two steps to deduce the specific driving behavior from driving data correspondingly without any supervision,the first step being using Bayesian model segmentation algorithm to divide driving data that inertial sensor collected into near-linear segments with the help of Bayesian model segmentation algorithm,and the second step being using extended LDA model to aggregate those linear segments into specific driving behavior (such as braking,turning,acceleration and coasting).Both offline and online experiments are conducted to verify this approach and it turns out that approach has higher efficiency and recognition accuracy when dealing with numerous driving data.     

Kubelka—Munk模型下的人血管对632．8nm氦—氖激光的散射与吸收特性

本文测量了人动脉和静脉对He-Ne激光的反射和透射传输特性。实验采用两积分球系统及波长为632．8nm的He-Ne激光器,并根据测量数据及采用Kubelka-Munk模型分析和计算了人动脉和静脉组织对该波长激光的吸收系数、散射系统及总的光强I（x)及前向散射通量i(x)和后向散射通量j(x)的变化情况。结果表明,人动脉和静脉内外侧的漫反射率和透射率有明显差别,而且,动脉对激光的吸收系数明显较静脉的要小,而动脉对激光的散射系数却明显较静脉的要大,在动脉和静脉组织中总的光强I（x）及前向散射通量i(x)和后向散射通量j(x)的变化情况也有明显的区别。     

VLSI的计算机模拟模型研究

本文回顾了器件模型的发展历程,分析了在电路模拟中广泛使用的SPICE Leve13模型的器件输入、输出、衬偏、亚阈值等特性,指出该模型在模拟小尺寸器件时的不足之处,详细分析了影响MOS器件特性的主要小尺寸效应：自顾不暇 、窄沟道效应、非均匀掺杂效应、迁移率衰减效应、速度饱和效应、漏感应势垒降低效应、热电子效应、亚阈值电导等物理机理以及对器件性能的影响,分析了建立在上述多种效应基础之上的小尺寸器件的BSIM模型的机理（Berkley Short Channel IGFET Model）。     

宽带信号模型及分辨力性能研究

讨论了宽带信号的模型及条件,在此基础上对宽线性调频信号在宽带模型下的距离、速度及速度距离联合分辨率特性进行了分析和模拟,燕对宽带模型及窄带模型下的结论进行了比较,证明了信号分辨力取决于信号频谱结构及尺度,得出了两种模型下信号分辨力特性的关系。     

An optimum approach for fabrication of tapered hemispherical-end fiber for laser module packaging

Comprehensive measurements of the dependence of coupling efficiency and radius of curvature on taper angle in a tapered hemispherical-end fiber (THEF) for coupling between laser diodes and single-mode fibers are presented. The THEF was fabricated by etching the fiber end in a hydrofloride (HF) solution with a thin layer of oil floating on top of the HF, and then heating in a fusion splicer to form a hemispherical end. The results show that THEFs with larger taper angles fabricated by greater oil density exhibit a smaller radius of curvature, and hence a better coupling efficiency. The results of this investigation have led to an optimum approach for high-yield and high-volume fabrication of THEFs that is suitable for use in commercial laser diode modules for efficient coupling between laser diodes and single-mode fibers. The calculation of the effect of oil density in HF etching solution on taper angle based on a semiempirical model is in good agreement with the measured results.     

Influence of doping on the dynamical properties of III–V–N by Raman scattering, infrared absorption and model calculations

In the framework of a rigid-ion model and using realistic Greens function theory, we have studied systematically the influence of doping on the lattice dynamics of III–V-nitrides. Our theoretical analysis is based on a sound physical appeal for the perturbation caused by different dopants in compound semiconductors. After analyzing the dynamical behavior for two sets of impurities with closest masses occupying Ga- and As-sites in GaAs, we have proposed simple empirical relationships providing corrections to the impurity–host interactions for isoelectronic defects and for dopants carrying static charges. Despite the simplicity of perturbation models, our Greens function theory provided results in good agreement with the recent Fourier-transform infrared (FTIR) absorption data for the magnitude and splitting of N-isotopic shifts of localized vibrational modes in GaAs. With high-resolution FTIR spectroscopy, we strongly believe that the ¹⁴N_As-related broad local mode (471 cm⁻¹) in GaAs can be resolved into fine structures due to Ga-host isotopes. Theoretical results for the in-band modes of As_N in cubic gallium nitride are compared and discussed with the existing Raman data on molecular beam epitaxy (MBE) grown GaN layers on GaAs substrates, as well as on GaN samples intentionally doped with As.     

支持向量机漏电特征模型的电力设施漏电识别

针对电力设施中漏电引起的故障问题,提出了新型的漏电特性分析方法,该方法融合了基于支持向量机的漏电算法模型,实现了电力设施漏电特性的图像采集和A/D转换处理,最后输出后的数据信息通过DSP计算模块进行计算,最终输出电力设施的强电漏电信息或者弱电漏电信息,实现了电力设施漏电信息的识别.该研究将传统技术中的漏电难以分析的问题...     

基于人工神经网络的复杂介质中波的传播不确定性分析方法

土壤在物理系统的工作频率范围内可能表现出较强的色散性,色散物质的不确定参数在波传播的仿真结果中引入了不确定性。在考虑这些仿真结果的可接受性时,量化仿真结果中的不确定性至关重要。针对传统不确定性分析法计算效率低、运算量大的问题,该文以探地雷达建模仿真中的不确定性分析为例,提出一种基于人工神经网络的不确定性分析模型,阐述了模型的构建过程,及克服过拟合问题的策略。作为探地雷达全波仿真的替代模型能够预测仿真结果,进而得到仿真结果的统计信息,如均值、标准差。经比较,在相同的数值模型、不确定性输入参数个数,以及参数变化范围为10%的前提条件下,对任意一组输入参数,输出得到1000组结果时,该方法所得预测结果统计特性与执行全波仿真所得具有较好的一致性,且显著降低运算量,计算时间效率提升79.82%。     

Understanding the asymmetric perceptions of smartphone security from security feature perspective: A comparative study

Smartphones are being used and relied on by people more than ever before. The open connectivity brings with it great convenience and leads to a variety of risks that cannot be overlooked. Smartphone vendors, security policy designers, and security application providers have put a variety of practical efforts to secure smartphones, and researchers have conducted extensive research on threat sources, security techniques, and user security behaviors. Regrettably, smartphone users do not pay enough attention to mobile security, making many efforts futile. This study identifies this gap between technology affordance and user requirements, and attempts to investigate the asymmetric perceptions toward security features between developers and users, between users and users, as well as between different security features. These asymmetric perceptions include perceptions of quality, perceptions of importance, and perceptions of satisfaction. After scoping the range of smartphone security features, this study conducts an improved Kano-based method and exhaustively analyzes the 245 collected samples using correspondence analysis and importance satisfaction analysis. The 14 security features of the smartphone are divided into four Kano quality types and the perceived quality differences between developers and users are compared. Correspondence analysis is utilized to capture the relationship between the perceived importance of security features across different groups of respondents, and results of importance-satisfaction analysis provide the basis for the developmental path and resource reallocation strategy of security features. This article offers new insights for researchers as well as practitioners of smartphone security.     

一种新型基于环上带误差学习问题的认证密钥交换方案

利用格上判定带误差学习问题(Ring-DLWE)困难假设,该文基于Peikert的调和技术构造认证密钥交换方案。在标准模型下,该方案是CK模型中可证明安全的,并达到弱前向安全性(wPFS)。与现有的基于LWE的密钥交换方案相比,该方案使用平衡的密钥提取函数,因而保护共享会话密钥,同时因其基于格中困难问题,所以能抵抗量子攻击。