New exact solutions for the KdV equation with higher order nonlinearity by using the variational method

The Korteweg-de Vries (KdV) equation with higher order nonlinearity models the wave propagation in one-dimensional nonlinear lattice. A higher-order extension of the familiar KdV equation is produced for internal solitary waves in a density and current stratified shear flow with a free surface. The variational approximation method is applied to obtain the solutions for the well-known KdV equation. Explicit solutions are presented and compared with the exact solutions. Very good agreement is achieved, demonstrating the high efficiency of variational approximation method. The existence of a Lagrangian and the invariant variational principle for the higher order KdV equation are discussed. The simplest version of the variational approximation, based on trial functions with two free parameters is demonstrated. The jost functions by quadratic, cubic and fourth order polynomials are approximated. Also, we choose the trial jost functions in the form of exponential and sinh solutions. All solutions are exact and stable, and have applications in physics.     

Fast and low-complexity method for exact computation of 3D Legendre moments

A new method is proposed for fast and low-complexity computation of exact 3D Legendre moments. The proposed method consists of three main steps. In the first step, the symmetry property is employed where the computational complexity is reduced by 87%. In the second step, exact values of 3D Legendre moments are obtained by mathematically integrating the Legendre polynomials over digital image voxels. An algorithm is employed to significantly accelerate the computational process. In this algorithm, the equations of 3D Legendre moments are treated in a separated form. The proposed method is applied to determine translation-scale invariance of 3D Legendre moments in a very simple way. Numerical experiments are performed where the results are compared with those of the existing methods. Complexity analysis and results of the numerical experiments clearly ensure the efficiency of the proposed method.     

IT类应用型人才培养模式创新实验区改革

质量工程建设项目是教育部为推进高校提高教育教学质量的一项重要措施。"新建本科院校IT类应用型人才培养模式创新实验区"项目2009年获得福建省质量工程立项。文章对实验区建设三年多实践经验进行回顾和思考,对IT类应用型人才培养的教学理念、人才定位和建构可操作的实施方案,以及在人才培养创新模式运行机理模型方面作了有益的探索。     

确定两个任意简单多边形交、并、差的算法

提出了把多边形的边分为奇偶边的新思想，根据输入多边形A，B之间边的拓扑关系，划分A，B边为内边、外边、重叠边3种，揭示A，B与它们的交、并、差之间边的本质联系，进而描述了确定任意两个简单多边形交、并、差算法．算法的时间复杂度为O((n m k)log(n m k))，其中n，m分别是A，B的顶点数，k是两多边形的交点数．算法建立在数学理论基础之上，很好地处理了布尔运算的奇异情形，比如重叠边，边与边相交于边的顶点等情形．本算法易于编程实现。     

The virtual distortion method—a versatile reanalysis tool for structures and systems

For 20 years of development, the virtual distortion method (VDM) has proved to be a versatile reanalysis tool in various applications, including structures and truss-like systems. This article presents a summary of principal achievements, demonstrating the capabilities of the VDM both in statics and dynamics, in linear and nonlinear analysis. The major advantage of VDM is its exactness and no need for matrix inversion in the reanalysis algorithm. The influence matrix—numerical core of the VDM—contains the whole mechanical knowledge about a structure, by looking at all global responses due to local disturbances. The strength of the method is demonstrated for truss structures.     

A diagnosis method of wear and tool life for an endmill by ultrasonic detection

This study used ultrasonic scanning to investigate the contact between end-mill cutters and workpieces. This method is novel for endmills and has not been applied before. Contact shapes were disclosed and a comparison of contact images and areas was made from the experimental results. It is not a dynamic or online monitoring during the cutter machining process. Instead, it is only a static measurement because the objective is to provide the information for users to know the area size of a worn end-mill cutter. The 2D maps show an apparent change not only in area sizes but also in contact shapes for the used endmills. The 3D maps disclose the information for which region is in light or heavy contact.     

The centre of area method as a basic mechanism for representation and navigation

Potential methods and all their gradient-based derivations are extensively used in autonomous robotics, primarily in association with reactive navigational strategies. In this article we introduce the fundamentals, formalisation and application of a brand-new method based on first-order moments called the “centre of area method”. We also comment on its validity, at an individual level and in combination with other methods, in order to build a situated representation of the environment.     

基于改进Snake模型的工业CT图像内窥显示及测量

鉴于工业CT（ICT）图像具有目标形状比较复杂的特点,采用基于贪婪算法的改进主动轮廓模型进行图像分割,实现工业CT图像中三维目标的内窥显示及测量。实验结果证明了算法的有效性。     

面向设计制造一体化的管道预制管理信息系统

管道的制造和安装是工厂建设的重要组成部分,目前国内项目的管道设计、制造和安装过程中的信息还未有效地集成起来,针对这一问题提出了一种将管道设计和制造信息集成管理的模式．基于统一的分级管道数据模型,把管道设计过程中的各种信息和制造过程中材料管理、生产进度管理和质量控制的信息进行了统一,形成了管道布置系统的集成软件结构．利用一体化的管道预制管理系统,AEC项目的承包企业可以提升现有的流程,提高生产效率和制造的质量．该方法已经在相应的软件中得到了实现,给实际应用该软件的AEC企业带来了良好的效益．     

面向硬件工程师岗位的计算机组装与维护课程教改探索

从课程教学目标出发,分析了计算机硬件工程师应具备的基本知识、技能和素质,指出了当前高职院校计算机组装与维护教学中存在的普遍问题,提出了以职业为导向的计算机组装与维护课程教改新思路。     

《测量技术》课程“教学做一体化”实践探索

“教学做一体化”是将理论和实践融为一体的教学模式,它符合高职高专教育的要求,是培养技能型人才的有效手段。《测量技术》是注重培养学生操作技能的、重要的专业基础课,采用“教学做一体化”教学模式进行《测量技术》教学实践,体现以学生为主体的先进教学理念,将实践教学与理论教学有机结合,在培养学生的操作技能和理论知识的同时也培养了学生的创业能力和创新能力。     

基于SOA的烟草工商协同营销系统集成的研究

针对当前烟草行业日益增长的信息共享和工商协同营销的需求,提出了基于面向服务架构(Service Oriented Architecture,SOA)的企业服务总线(Enterprise Service Bus,ESB)系统集成架构,并将该架构应用到河南中烟的工商协同营销系统集成中.最后,实践证明SOA架构能够有效实现异...     

无人机测控与信息传输信道的建模与仿真设计

分析了无人机测控与信息传输系统中传输信道的特点,针对无人机飞行中不同的状态和环境条件,建立了不同的信道模型,并在此基础上,设计了一个可用于无人机测控与信息传输系统设计的信道仿真器,该仿真器通过设置不同的参数,可对无人机飞行中所处的不同通信信道进行仿真,以全面验证无人机测控与信息传输系统中所采用的传输技术性能及接收机性能。     

空间遥感器光机扫描控制器测试系统的开发与实现

为提高遥感器光机扫描控制器的研制效率,针对目前空间扫描系统常用的执行、测角反馈部件,研制一套开发测试系统,用于对扫描系统的动力学运动特性参数、角度测量特性进行测试,同时根据测试信息快速开发控制器,形成开发-测试的闭环,提高控制器开发的精确性。根据设计需求,对开发测试系统的结构、具体参数,快速原型机的构成、实时硬件开发平台,以及信息集成平台的结构进行了详细介绍。利用直流无刷电机、旋转变压器模拟系统以及快速原型机对系统进行了模拟测试,证明开发测试系统可有效进行扫描系统控制器的快速测试及开发。     

信息学科产学研合作教育模式的探讨和研究

信息学科的迅速发展和高等院校的大力扩招,导致高等学校信息学科培养的人才与社会脱节,毕业生就业难,但企业却招不到合适的人才。信息学科产学研合作教育模式是解决这些问题的有效途径,本文从该模式存在的必然性、存在方式、关键问题和实施方法等方面进行探讨和研究,论证了这种教育模式对高等教育的深远影响。     

新的空间数据模型选取方法与实现

空间数据模型是地理信息系统开发应用的核心和基础,选择合适的空间数据模型,直接关系到整个系统的算法实现和开发效率.结合软件工程学的思想,提出一种新的空间数据模型选取方法,并以城镇土地定级估价系统的构建为例,详细介绍该方法的实现过程.实践表明,该方法具有抗风险、敏捷等特点,在实际工程运用中具有较好的可行性和优越性.     

Generalization of the Lambertian model and implications for machine vision

Lambert's model for diffuse reflection is extensively used in computational vision. It is used explicitly by methods such as shape from shading and photometric stereo, and implicitly by methods such as binocular stereo and motion detection. For several real-world objects, the Lambertian model can prove to be a very inaccurate approximation to the diffuse component. While the brightness of a Lambertian surface is independent of viewing direction, the brightness of a rough diffuse surface increases as the viewer approaches the source direction. A comprehensive model is developed that predicts reflectance from rough diffuse surfaces. The model accounts for complex geometric and radiometric phenomena such as masking, shadowing, and interreflections between points on the surface. Experiments have been conducted on real samples, such as, plaster, clay, sand, and cloth. All these surfaces demonstrate significant deviation from Lambertian behavior. The reflectance measurements obtained are in strong agreement with the reflectance predicted by the proposed model. The paper is concluded with a discussion on the implications of these results for machine vision.     

滑坡高分辨率遥感多维解译方法及其应用

目的:高分辨率遥感影像技术的发展使得对于地质灾害体的要素组成、形态结构的遥感解译成为可能。目前,遥感影像解译存在着过度依赖影像色彩、纹理、阴影等光学要素,片面追求影像解译标志,DEM数据利用程度低,对基于DEM、GIS的影像复合分析、空间分析、3D可视化等技术方法的应用较少等问题。方法：本文以灾前灾后高精度DEM和高分辨率遥感影像为基础,探讨了地质灾害滑坡的一维、二维、三维三种遥感解译方法,分析了三者之间的互补关系,并应用三种遥感解译方法对贵州关岭“6.28”特大滑坡进行了遥感解译分析,文章最后对有关滑坡多维遥感解译方法体系的建立进行了讨论。结果：研究结果表明：滑坡高分辨率遥感多维解译方法中,一维高程曲线计算、二维影像对比分析、三维场景精细解译分别属于滑坡遥感解译的初判方法、动态分析方法、定量计算方法;结论：其中,一维高程曲线计算为滑坡遥感的二、三维解译提供了有关滑坡崩塌区、滑坡区、堆积区的可能分区参考框架,而二维影像对比分析向三维场景精细解译的发展则体现了以人机交互方式为主要手段的滑坡高分辨率遥感影像解译由定性监测向定量计算的发展。     

面向领域实体关系联合抽取的标注方法

针对传统实体关系标注方法存在效率低下、错误传播、实体冗余等问题,对于某些领域语料中存在“一实体（主实体）同时与多个实体之间存在重叠关系”的特点,提出一种面向领域实体关系联合抽取的新标注方法。首先,将主实体标注为一个固定标签,将文本中与主实体存在关系的其他每个实体标注为对应实体对间的关系类型,这种对实体和关系进行同步标注的方式节省了至少一半的标注成本;然后,直接对三元组进行建模,而不是分别对实体和关系进行建模,通过标签匹配和映射即可获取三元组数据,从而缓解重叠关系抽取、实体冗余以及错误传播等问题;最后,以作物病虫害领域为例进行实验,测试了来自转换器的双向编码器表征量（BERT）-双向长短期记忆网络（BiLSTM）+条件随机场（CRF）端到端模型在1 619条作物病虫害文档的数据集上的性能。实验结果表明该模型的F1值比基于传统标注方式+BERT模型的流水线方法提高了47.83个百分点;与基于新标注方式+BiLSTM+CRF模型、卷积神经网络（CNN）+BiLSTM+CRF等经典模型的联合学习方法相比,该模型的F1值分别提高了9.55个百分点和10.22个百分点,验证了所提标注方法和模型的有效性。