Atomic Decompositions of Weak Hardy Spaces of B-Valued Martingales

The atomic decompositions of weak Hardy spaces of Banach-space-valued martingales are given. With the help of the atomic decompositions, some inequalities for B-valued martingales are established in the case 0〈r≤1. Here the results are connected closely with the p-uniform smoothness and q-uniform convexity of Banach spaces which the martingales take values in.

Structured Light 3D Vision Based on Laser Scanning Space-encoding and Its Synchro Control

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BOUNDEDNESS OF DYADIC DERIVATIVE AND CESARO MEAN OPERATOR ON SOME B-VALUED MARTINGALE SPACES

In this article, it is proved that the maximal operator of one-dimensional dyadic derivative of dyadic integral I＊ and Cesàro mean operator σ＊ are bounded from the B-valued martingale Hardy spaces pΣα, Dα, pLα, p H#α, pKr to Lα （0 α ∞）, respectively. The facts show that it depends on the geometrical properties of the Banach space.

ATOMIC DECOMPOSITION FOR B-VALUED R.V. SEQUENCE SPACES

In this article,atomic decompositions and the duals of some B-valued r.v.se- quence spaces are investigated.The results show that it closely depends on the geometrical properties of the sequence that take values in.

Indoor Space Modeling and Parametric Component Construction Based on 3D Laser Point Cloud Data

In order to enhance modeling efficiency and accuracy,we utilized 3D laser point cloud data for indoor space modeling.Point cloud data was obtained with a 3D laser scanner and optimized with Autodesk Recap and Revit software to extract geometric information about the indoor environment.Furthermore,we proposed a method for constructing indoor elements based on parametric components.The research outcomes of this paper will offer new methods and tools for indoor space modeling and design.The approach of indoor space modeling based on 3D laser point cloud data and parametric component construction can enhance modeling efficiency and accuracy,providing architects,interior designers,and decorators with a better working platform and design reference.

基于空间馈电的高功率波束扫描螺旋透射阵列天线设计

传统的透射式空馈阵列存在功率容量低的缺点,不能直接应用于高功率微波领域。现有的高功率空馈阵列布局不够灵活,波束扫描速度较慢,不能充分发挥空馈阵列在系统集成方面的优势。提出并设计了一种新型的采用空间馈电的螺旋辐射单元,并构建了一种透射式空馈螺旋阵列天线,通过控制单个螺旋旋转可以实现二维波束扫描,在设计上更加灵活,可根据实际应用需求调整阵列布局,符合高功率微波天线紧凑化、模块化的发展趋势。仿真设计了包含324个单元的透镜阵列,数值模拟结果表明,单元反射系数S11≤-20 dB,功率容量0.35 MW,阵列口径效率0.68,可在±45°范围内扫描,最大增益下降3 dB。

基于点云空间扩展的盾构隧道整体去噪方法

盾构隧道点云数据的去噪工作是后续隧道结构分析的前提。本文结合点云空间扩展理论与盾构隧道呈圆柱形的特点,提出了一种盾构隧道的整体去噪方法。首先将盾构隧道空间扩展后得到新的拓扑结构,使盾构隧道的去噪工作能够使用现有成熟的地面滤波算法。经过直通滤波、坡度滤波后的隧道点云保留完整的衬砌结构,隧道的附属设施被滤除。使用直线段与曲线段隧道进行试验,试验结果表明,该方法能够实现隧道的整体去噪,去噪效果显著。

辽宁省西部某县2011年1月至2021年12月乙型病毒性肝炎发病率的时空分布特征

目的:了解辽宁省西部某县2011年1月至2021年12月乙型病毒性肝炎(简称乙型肝炎)发病情况及其时空分布特征。方法:从该县疾病预防控制中心获取乙型肝炎资料,计算粗发病率及标化发病率;采用ArcGIS软件进行乙型肝炎发病情况的全局自相关分析及局部自相关分析,采用SaTScan软件进行时空扫描分析获取乙型肝炎发病的病例分布及时空聚集情况。结果:2011年1月至2021年12月该县乙型肝炎累计病例2978例,粗发病率为69.25/10万,标化发病率为70.13/10万。乙型肝炎粗发病率以头台满族镇最高,其次是高台子镇和城关街道。2014年、2016年、2019年、2021年该县全局自相关呈聚集分布;局部自相关发病热点区域聚集在该县中、西部,H-H聚集区域于2014至2016年有头台满族镇、九道岭镇,2017至2019年有头道河满族乡、义州街道、城关街道,2020至2021年有前杨镇和义州街道;L-L聚集地区多集中于该县西南部,为地藏寺满族乡、大定堡满族乡和留龙沟满族乡;时空扫描分析共得到4个聚集区域,一级区域为2017年的张家堡乡,二级区域包括2011至2015年的前杨镇和城关街道,三级区域为2013至2016年的高台子镇,四级区域为2014至2017年的头台满族镇。结论:2011年1月至2021年12月辽宁省西部某县乙型肝炎发病地区主要集中在中部和西北部,中西部的聚集性高,且有随时间推移逐渐向北部地区扩散的趋势,应重视乙型肝炎高发乡镇并进行有效预防监测管理。

基于双面平行带线的全空间扫描漏波天线

为了实现从后向端射到前向端射的连续波束扫描天线,该文基于双面平行带线结构提出了一种具有全空间扫描能力的漏波天线。天线单元由双面平行带线传输线和一对反向加载的开路枝节组成,两个开路枝节分别位于传输线的上导带和下导带。加载的反向开路枝节等效为一个偶极子,使得天线单元具有全向辐射性能,作为整个全空间扫描漏波天线的基础单元。为了抑制周期漏波天线中的开阻带问题,又在天线基础单元上加载了一对平衡槽以实现频率平衡条件,还加载了一对匹配槽以匹配周期结构的阻抗。最后实现了一款天线原型,经仿真与实验验证,该天线能够在7.6 GHz到14.0 GHz的频率范围内,实现从后向端射,经侧向辐射,然后到前向端射的全空间扫描能力。

运用激光雷达扫描技术进行停车位调查

城市停车位资源的基础空间数据一般采用人工传统测量与调查的方式获取,该方式工作量大、效率低、调查成果无法追溯,且人员在道路测量中存在安全隐患。鉴于此,以天津市南开区为例,利用车载和地面激光雷达扫描技术调查采集城市各类停车资源,借助人工和自动提取技术提取现状各类停车位和桥下空间信息,并通过数据核查对各类现状停车资源进行修正,快速获取城市各类停车资源的基础信息数据。采用激光雷达扫描技术调查停车位可突破传统车位调查的作业模式,大大提高调查的速度与准确度,并保障人员安全和数据的可溯源性,为城市停车位现状资源调查提供了新的技术方案。

基于2 bit超表面的单阶谐波波束扫描

波束扫描是一种广泛应用于无线通信、雷达、卫星通信和其他相关领域的技术,它允许无线信号或射线束在空间中定向、聚焦。近年提出的智能超表面时空编码方式拓展了超表面在物理维度上的自由度,使得其可以在单音波激励下完成多个频点的波束扫描,但仍然面临着增益低、波束副瓣大等一系列问题。针对这些问题,提出了一种基于超表面的谐波波束扫描方法。设计并加工了一种在E面可以达到斜入射60°的角度不敏感2 bit超表面单元并组建32×32阵列。针对单元谐波状态做出精确的3 bit相位量化。通过针对不同的初始参考相位,使用多目标遗传算法进行优化,将正一阶谐波的波束副瓣压低在了-15 dB水平,完成了时空编码超表面在E面60°波束扫描,为未来在超表面时空编码谐波波束赋形提供了充分有力的方案。

基于特征空间值筛选的点云关键点提取

针对传统的三维激光扫描点云关键点提取算法存在的计算效率低下、对噪声敏感以及算法不稳定等问题,提出了一种基于特征空间值筛选的关键点提取算法。首先建立用于特征提取的网络架构模型,以点云集内所有点与其邻域点的法向量夹角集合为输入,以一维特征空间向量为输出,按特征空间向量大小排序,选取其中最大n个值对应的点作为关键点。实验结果表明,该算法的关键点具有较高的可重复性和运行效率,且对于噪声的鲁棒性更好;在小场景、大场景数据中平均重复率分别约提高了23.0%和9.3%;关键点主要分布于特征变化明显区域,可较好地表达点云特征。

优化MRI重T_2 3D-SPACE-STIR序列在臂丛神经扫描中的临床应用价值

目的:探讨优化MRI重T_2 3D-SPACE-STIR序列在臂丛神经显示方面的可行性及临床应用价值。方法:回顾性分析行磁共振臂丛神经扫描的50例患者的临床及影像资料,所有患者均行常规臂丛神经平扫(方法 A)、增强扫描(方法 B)及优化MRI重T_2 3D-SPACE-STIR序列(方法 C)扫描。比较三种成像方法的图像质量、图像背景抑制、信噪比(SNR)、对比噪声比(CNR)和臂丛神经锁骨上、下段的显示率,并进行统计学分析。结果:三种成像方法的图像质量评分分别为3.51±0.42、3.76±0.47、3.75±0.43,方法B和C明显优于方法 A,差异有统计学意义(方法 A与C比较P=0.024,方法A与B比较P=0.043),但B与C之间差异无统计学意义。方法 B的背景抑制效果最佳,三种成像方法两两之间差异均有统计学意义(方法 A与B比较P=0.000,方法 A与C比较P=0.024,方法B与C比较P=0.010)。方法 A与C之间的SNR和CNR差异均有统计学意义(P值均=0.000)。三种成像方法对锁骨上段的显示率分别为66.0%、88.0%、84.0%,方法 A与C之间差异有统计学意义(P=0.035),方法B与C之间差异无统计学意义(P=0.727);三种成像方法对锁骨下段的显示率分别为52.0%、80.0%、74.0%,方法 A与C之间差异有统计学意义(P=0.027),方法B与C之间差异无统计学意义(P=0.607)。结论:优化MRI重T_2 3D-SPACE-STIR序列与常规增强扫描在臂丛神经的显示上无明显差异,且均优于常规臂丛神经平扫。优化MRI重T_2 3D-SPACE-STIR序列不需要注射对比剂,对不适合使用对比剂的患者具有较高的临床应用价值。

Hàjek-Rèniy Type Inequality for Banach Space Valued Martingales and Its Applications

In this paper,we establish the Hàjek-Rèniy type inequality for Banach space valued martingales generalizing the recent results of Tómcs and L'ibor [1].Then p-uniformly smoothable Banach space is characterized in terms of the Hàjek-Rèniy type inequality for Banach space valued martingales.Those results generalize the recent results of Gan Shixin [2].

Acquisition,Pointing and Tracking System for Shipborne Space Laser Communication without Prior Information

A space laser communication acquisition,pointing and tracking(APT)system based on the beacon laser is designed without prior information.And then,a new target scanning method and a pointing and tracking algorithm are proposed.The target scanning mode is the round-trip triangular wave scanning,and it means that scanning track of the PAN-TILT platform follows the triangular wave repeatedly.For the pointing and tracking algorithm,the beacon laser is used as the auxiliary aiming light source.The position of the beacon laser in the viewfield of the complementary metal oxide semiconductor(CMOS)camera is calculated by the centroid algorithm.In order to realize the target tracking,the joint control method of the angle control and the angular velocity control is used.The simulation and experimental results show that the APT system can achieve full coverage scanning in the scanning area and capture the target in one scanning cycle successfully.After capturing the PAN-TILT platform,the pointing and tracking algorithm can track the PAN-TILT platform quickly and accurately,and the tracking accuracy is up to 0.22 mrad.

CT Scan of the Foot in Patients with Chronic Non-Healing Diabetic Foot Ulcer

Background: Diabetes mellitus is a chronic disease where there is an increased blood sugar level in the body which is either caused due to inability of the pancreas to secrete insulin or the body’s inability to utilize it. The prevalence of diabetes mellitus is growing rapidly worldwide. Statistics show that in the year 2014, there were a total of 422 million cases of DM. Diabetes mellitus is a major cause of heart attacks, kidney failure, blindness and leg amputations. Diabetic foot ulcers are quite common and are estimated to affect nearly 15% of all diabetic patients during their lifetime. In long standing diabetic patients with chronic non-healing ulcers, bony changes or deformities are not uncommon. These bony changes can be identified using CT scans. Materials and Methods: An observational study was conducted on a total of 40 patients with chronic non-healing ulcer attending the surgery outpatient department of Saveetha Medical College, Chennai, Tamilnadu. The CT-scans of their foot were observed for deformities or bony changes. Results: Out of 40 patients, 67.5% were males and 32.5% were females. A maximum number of subjects fell under the age group of 51 - 60 years. The most common site of the ulcer was found to be in the plantar surface of big toe (53%). Among the 40 patients, 33 of them were found to have bony abnormalities on the CT scan of foot and no apparent changes were seen in the rest. Bone erosions (35%), osteopenic changes (22.5%), Charcot’s joint (2.5%), osteophyte formation (12.5) and reduced joint space (10%) were the predominant changes observed on the CT scans of the study population.

Systematic studies on scan and driving model for flat panel display

Aiming at the time redundancy in the fiat panel display （FPD） imaging process, the paper studied some problems for FPD gray scale controlling based on the fraetal theory, dissertates the construction of the space-time mapping topology architecture, the proposition of optimal scanning structure for FPD＇s gray imaging, and the creation of the fractal theoretic model. Then the logic implementation and system application are presented based on the fraetal model of the optimal scan architecture, and the application results achieved target of eliminating time redundancy and increasing the scanning availability. The novel control mode that the fractal scanning IP core described with Verilog language embedded in the FPGA hardware frame can efficiently increase the imaging gray scales and quality in the FPDs scanning controller and speed up the frame frequency of display system.

精指向机构45°扫描镜光矢量轨迹正交性研究

在空间激光通信终端中,精指向机构45°扫描镜振动轴绕不同轴系振动时,捕获跟踪CMOS相机上的扫描轨迹不正交,使得激光终端扫描概率降低、光轴在轨标定难度增大。为研究其内在机理,利用光学追迹的方法建立三维光矢量扫描轨迹模型,计算并仿真45°反射镜振动轴沿两组常用正交轴扫描时,CMOS相机上光矢量轨迹的正交性,搭建实验测试系统验证该计算仿真在精指向机构扫描过程反射光矢量的性能。研究结果表明:45°扫描镜振动轴绕P=(1/2,-1/2,√2/2)^(T)和P′=(1/2,-1/2,-√2/2)^(T)振动扫描轨迹的不正交度为19.47°,不随扫描角度的变化而发生变化,实验验证和理论结果一致;45°扫描镜振动轴绕z轴和P=(√2/2,-√2/2,0)^(T)振动时,由扫描角度和扫描轨迹正交性曲线关系,得出CMOS相机上扫描轨迹夹角随着扫描角度变化而变化,当扫描角度为9 mrad时,扫描轨迹的不正交度为6.4 mrad。该研究对空间激光通信终端精指向机构扫描的内在机理、安装方式、轴外视场光轴标定等有深刻的认识和指导意义。

基于三极化单元的平面阵列半空间扫描波束形成与分析

为了实现三极化平面阵列的高性能宽角扫描,提出一种基于三极化单元的平面阵列半空间扫描波束形成方法,并对相控阵扫描特性进行了分析。首先,在假设单元3个极化特性一致的前提下,从期望的合成波束指向出发,将与之正交的极化电场单位矢量沿3个极化方向分解,从而获得3个极化电场分量的相位和幅度,再依据功率与极化电场幅度平方成正比的关系,推导获得4种极化形式下极化合成所需的激励表达式,并通过仿真验证了该激励表达式的正确性。接着采用经典的阵因子控制方法,改变阵元相位差,使阵因子扫描角与单元波束指向一致,从而形成半空间任意方向扫描的阵列波束。最后,在不考虑阵元间互耦的情况下,对4种极化形式下的阵列扫描特性进行仿真分析与对比,结果表明,该阵列具有优越的半空间扫描特性,验证了该波束形成方法的有效性。

基于激光扫描和深度学习的人体动作精准识别研究

基于特征进行人体动作识别时,主要依靠短时间规模的时空特征,导致识别结果top-1值较低。因此,提出结合激光扫描技术和深度学习原理,设计有效的人体动作识别方法。针对激光扫描数据,进行去噪和校正处理。通过背景差分法划分静态背景与感兴趣区域,根据扫描数据点的连续性特点、空间位置关系,检测出待识别的人体目标。建立包含时空注意力机制的深度学习人体动作识别模型,获取扫描数据中包含的长期、复杂时空信息,得到融合特征输入融合域,得到初始分类结果。最后,结合决策融合机制,生成人体动作精准识别结果。实验结果表明:所提方法的top-1值为74.4%,与其他识别方法相比提升了30.7%、28.9%和24.2%。