一个方便的页打印工具

笔者在长期编程过程中,经常需要打印一些比较长的源程序作为技术文件的一部分归档,却一直没有发现一个比较好使用的页打印工具。直接用DOS系统命令COPYNAME PRN只能连续打印源程序,折页造成破损且不易双面打印,也不能同时自动加上源程序名和编程时间,不便于归档保存;WS固然可以实现页打印,但改变页长需变动源程     

FLUKE红外热像仪在管线检测的应用

管线是许多过程行业及制造业的重要设备，一般用于原料、产品及生产资料的输送。管线经常伴随着一定的温度和压力产生有不同程度的腐蚀，特别是管线堵塞、变薄、裂纹等等，往往肉眼无法发现，通过热像仪，可以根据细微的温度变化作判断，从而避免对环境及人员造成伤害。另外，能对热力管线外壁温度的测量，管线外壁保温层材料在生产过程中会逐渐破损、掉落，     

基于百度地图JavaScript API的气象数据应用

在气象业务服务中,通常需要实时关注天气的变化及降雨变温的情况,尤其在强天气过程中,单点强降雨对人们的生活会造成较大的影响.利用百度地图开发接口将气象观测数据进行实时展示,提高气象工作者对数据的分析效率.     

VMware虚拟机在计算机双语教学中的应用

计算机双语教学过程中经常需要对操作系统(OS)和应用程序(Application)的命令、菜单、界面进行中英文实时对照。而往往普通PC只安装一种操作系统,或者是中文或者是英文,无法实现实时的中英文对照。这是目前计算机双语教学的主要瓶颈之一。本文将研究在Windows XP操作系统下通过虚拟化技术实现操作系统以及Microsoft Office2003系列套件的实时中英文对照。     

基于OWC和XML动态统计图表的设计与实现

在使用ASP 或 ASP.NET进行Web开发中,经常需要将各种统计数据或数据库以图形的方式表达出来,以便决策和分析.通过时Office自带的OWC服务器组件以及XML技术的全面研究和剖析,实现了复杂曲线的绘制,并将这种方法运用于电信行业的话务分析系统中,实现了对话务的实时分析.     

基于TeeChart的热流分析系统开发

在对卫星外测热流数据处理过程中,经常需要对热流数据进行实时或非实时数据的绘图分析,以及对图形进行相关的灵活操作。针对这一实际需求,设计了热流分析系统,并讨论了在.Net环境下如何使用TeeChart技术来实现热流分析系统的设计,同时也介绍了TeeChart的应用方法,给出了相关C#代码,实践证明,基于TeeChart的热流分析系统界面简洁,操作更简单,稳定性更好,提高了对卫星热流数据分析的效率。     

Windows中示波器波形锁定功能的模拟与实现

在数据采集与处理的编程中,经常需要对数据波形进行实时显示与处理,而要对数据波形进行实时显示就要对示波器的功能进行模拟。 示波器的主要功能有两个:一是可以实时、动态地显示所测量的波形;二是可以随机地对正在动态显示的波形进行锁定。因此,要在数据采集与处理程序中对示波器的功能进行模拟,主要是实现下述两个目标:一是当数据采集模块开始工作后,程序应能将采集的数据实时地在显示器上以某种方式(比     

计算机维护中常见故障的处理方法研究与探讨

计算机在日常使用过程中,经常会发生一些小故障,影响了计算机的日常使用。因此需要对计算机故障进行及时的维修,才能保证计算机正常运行,方便操作。本文分析了计算机维护中常见故障类型,并将这些故障的处理方法进行了实践性研究探讨。     

计算机视觉在精密模具破损检测系统的应用

在图像准确检测问题的研究中,由于在高精密仪器中,各种损伤极其细微,传统的利用模具高斯曲线拟合检测技术在进行这种破损检测时,往往会因为破损部位过小,造成特征混淆,特征寻优过程陷入不收敛的境地,从而降低了精密模具破损检测的准确性.为了避免上述缺陷,提出了一种边缘像素定位的精密模具破损检测算法.利用像素灰度差值方法,提取精密模具图像的像素特征,并将其作为精密模具破损检测的数据基础.利用一种边缘像素定位方法,计算精密模具破损区域边缘的空间位置,从而实现精密模具的破损检测.实验结果表明,利用改进算法进行精密模具破损检测,能够提高检测的精度,从而满足精密模具生产过程中质量检测的需求.     

基于工业触摸屏的多点数据通信系统的设计

针对工业控制过程中经常需要同时使用多品牌控制器组建控制系统的问题,基于ARM9工业触摸屏及嵌入式HMI软件,以台达DVP系列PLC和三菱FX系列PLC为例对工业触摸屏同时与多品牌的多个PLC的通信进行研究,借助嵌入式HMI软件良好的人机界面实现对多品牌多PLC控制系统中的设备进行实时通信.该方案同样适用于在控制系统中使用了其他具有通信功能的控制器,如伺服放大器、温控模块等的场合.     

服装动态效果的仿真技术

真实性和实时性一直是服装动态效果仿真所追求的目标.为了对服装的动态效果进行真实的仿真,就必须对织物的所有主要参数进行精确的模拟,如弹力和粘力.实时服装动画的一个难点就是对服装褶皱的模拟,以及相应的碰撞检测问题.对服装动态效果仿真技术的现状进行了介绍,并对未来的发展提出了一些看法.     

自动电磁除杂技术在烟草除杂工艺中的应用

在造纸法薄片生产的原料加工、输送过程中,由于原料中含有大量的铁质杂物,会造成设备关键加工部位异常磨损和损坏,严重影响加工过程的在制品质量.为实现对原料生产工艺环节中铁质杂物的自动去除和收集,设计了一套自动电磁除杂机系统,并从磁选机体、电磁吸盘、加磁模块、传动机构、料位高度探测、PLC等工控设备以及控制软件方面,对该系统进行详细阐述.试验结果表明,该系统能够系统、高效地去除造纸法再造烟叶原料中含有的大量铁质杂物.     

Continuum-based Strain Limiting

We present Continuum-based Strain Limiting (CSL) – a new method for limiting deformations in physically-based cloth simulations. Despite recent developments for nearly inextensible materials, the efficient simulation of general biphasic textiles and their anisotropic behavior remains challenging. Many approaches use soft materials and enforce limits on edge elongations, leading to discretization-dependent behavior. Moreover, they offer no explicit control over shearing and stretching unless specifically aligned meshes are used. Based on a continuum deformation measure, our method allows accurate control over all strain components using individual thresholds. We impose deformation limits element-wise and cast the problem as a 6×6 system of linear equations. CSL can be combined with any cloth simulator and, as a velocity filter, integrates seamlessly into standard collision handling.     

Low damped cloth simulation

This paper proposes a new implicit integration technique that reproduces a stable cloth without introducing excessive damping forces. Semi-implicit integration methods have been widely used in cloth simulations because of their high stability and speed. Artificial internal damping forces are generated during the linearization process of the semi-implicit integration. The simulations become extremely stable due to the artificial forces; however, the forces significantly degrade the realism of cloth simulations, since they are generated with respect to rotational rigid motions, as well as internal deformations. Hence, we propose a new method to decrease the damping artifacts. The artificial internal damping forces are computed solely for pure internal deformations, and are stably incorporated into the dynamical system. Experiments show that our simulator can reproduce various cloth materials without excessive damping artifacts even in real-time.     

快速的布料碰撞检测和有效的接触摩擦算法

为了快速处理布料的碰撞检测并获得真实的接触摩擦仿真效果,提出一种基于罚函数的碰撞/接触解决方案.首先,采用质点-弹簧模型进行布料的仿真模拟,在弹簧形变方向添加改进的阻尼力,以减少粒子之间的振荡来保证系统稳定性;其次,采用代数非穿透滤波器对连续碰撞检测算法进行简化求解,快速判断是否存在方程根,提高布料每帧运行的仿真效率;最后,采用库仑约束和接触约束对每个碰撞/接触对进行约束,并结合改进的罚函数法有效地响应所有的碰撞/接触对.实验结果表明,该算法在CPU仿真环境下能快速有效地处理布料的碰撞和接触摩擦,模拟出布料复杂的物理行为,适用于实时的交互应用.     

Parallel Cloth Simulation Using OpenGL Shading Language

The primary goal of cloth simulation is to express object behavior in a realistic manner and achieve real-time performance by following the fundamental concept of physic. In general, the mass–spring system is applied to real-time cloth simulation with three types of springs. However, hard spring cloth simulation using the mass–spring system requires a small integration time-step in order to use a large stiffness coefficient. Furthermore, to obtain stable behavior, constraint enforcement is used instead of maintenance of the force of each spring. Constraint force computation involves a large sparse linear solving operation. Due to the large computation, we implement a cloth simulation using adaptive constraint activation and deactivation techniques that involve the mass–spring system and constraint enforcement method to prevent excessive elongation of cloth. At the same time, when the length of the spring is stretched or compressed over a defined threshold, adaptive constraint activation and deactivation method deactivates the spring and generate the implicit constraint. Traditional method that uses a serial process of the Central Processing Unit (CPU) to solve the system in every frame cannot handle the complex structure of clothmodel in real-time. Our simulation utilizes the Graphic Processing Unit (GPU) parallel processing with compute shader in OpenGL Shading Language (GLSL) to solve the system effectively. In this paper, we design and implement parallel method for cloth simulation, and experiment on the performance and behavior comparison of the mass–spring system, constraint enforcement, and adaptive constraint activation and deactivation techniques the using GPU-based parallel method.     

基于质点-弹簧模型碰撞检测算法的改进

碰撞检测技术在织物的模拟等方面中有着广泛的应用.在采用质点-弹簧模型对柔性表面进行建模,对网格曲面进行三角划分后,为环境中的物体建立各自的方向包围盒(OBB).用改进的碰撞检测和自碰撞检测算法对柔性织物及其所处三维空间中的物体进行处理,提高了柔性织物动态仿真的速度.     

基于不确定性信息的水泥生料配料过程智能优化系统

针对水泥生料配料过程原料质量不稳定和检测环节大滞后所引入的诸多信息不确定性,结合目前广泛应用的干法水泥生产工艺,提出了一种生料配料过程两级智能优化系统,即首先对生料配料过程进行率值的优化控制,一定程度地减弱不确定信息对生料质量的影响,然后采用改进性遗传算法求解生料最优调配方案,配制出优质水泥生料,以此达到生料质量的优化...     

基于轮廓特征及扩展Kalman滤波的车辆跟踪方法研究

在车辆实时跟踪中,基于Kalman滤波的方法是常用的有效方法,但因车辆检测时常将靠近的物体检测成一个目标引起误检现象,这会使在目标匹配时产生错误。为此,首先考察运动区域的长宽比和占空比,进行误检判断;然后提出了一种基于轮廓特征拐点的车辆分割方法;最后引入基于扩展Kalman滤波的跟踪模型。实验结果表明,采用的误检判断准则对多车辆的检测区域有较高的识别率,提出的基于轮廓特征拐点的车辆分割方法可实现重叠遮挡车辆的准确完整分割,用基于扩展Kalman滤波的跟踪模型实现了车辆的实时跟踪。     

Interactive thin elastic materials

Despite great strides in past years are being made to generate motions of elastic materials such as cloth and biological skin in virtual world, unfortunately, the computational cost of realistic high‐resolution simulations currently precludes their use in interactive applications. Thin elastic materials such as cloth and biological skin often exhibit complex nonlinear elastic behaviors. However, modeling elastic nonlinearity can be computationally expensive and numerically unstable, imposing significant challenges for their use in interactive applications. This paper presents a novel simulation framework for simulating realistic material behaviors with interactive frame rate. Central to the framework is the use of a constraint‐based multi‐resolution solver for efficient and robust modeling of the material nonlinearity. We extend a strain‐limiting method to work on deformation gradients of triangulated surface models in three‐dimensional space with a novel data structure. The simulation framework utilizes an iterative nonlinear Gauss–Seidel procedure and a multilevel hierarchy structure to achieve computational speedups. As material nonlinearity are generated by enforcing strain‐limiting constraints at a multilevel hierarchy, our simulation system can rapidly accelerate the convergence of the large constraint system with simultaneous enforcement of boundary conditions. The simplicity and efficiency of the framework makes simulations of highly realistic thin elastic materials substantially fast and is applicable of simulations for interactive applications. Copyright © 2015 John Wiley & Sons, Ltd.