多功能激光微织构加工软件系统设计与开发

针对激光微织构加工软件设计中存在的功能不齐全、人机交互性差、可视化程度低等问题,以激光微织构加工需求为背景,基于QT开发一套多功能激光微织构加工软件系统,设计四大功能模块,支持多种工艺加工。考虑到加工过程中存在的定位精度不高、表面形貌不易观测等问题,应用机床三维坐标变换技术等关键技术设计软件功能,实现了加工平台微米级精度运动,以及激光器与加工平台协同工作,改善了激光微织构形貌观测难度。利用激光微织构加工设备构建实验环境,对软件进行功能测试。结果表明:软件能够满足激光微织构加工的功能需求。软件功能设计完善、集成度高、人机交互感好,为激光微织构加工和激光表面形貌研究提供了技术支撑。     

光反馈激光器非线性仿真研究

一些传统计算方法对非线性系统的分析存在着一些困难。针对光反馈半导体激光器收发系统微分方程组的特点,对非线性性质做出了数学上的分析,考虑到在光反馈半导体激光器收发系统中,其微分方程含有延迟因子,无法直接利用多节点上的值的加权和来近似计算斜率。基于龙格-库塔法提出了一种有效的数值仿真算法,并在matlab平台上对给定参数条件下的发射端与接收端的归一化光场以及同步误差进行了仿真,证明了接收端光场信号可以很快与发射端光场信号一致,仿真结果表明仿真算法能有效对系统进行仿真分析。     

Shape recognition of laser beam trace for human–robot interface

A robot navigation system using the pattern recognition of figures drawn by a laser pointer has been proposed. Typical figures are registered and assigned to individual robot commands. Each figure is identified based on the feature of its edges. This system detects trace of laser beam and calculates its optical flow vectors. Each figure has its own characteristic distribution pattern of vector inclinations. By evaluating the optical flow pattern of displayed laser spot, the system distinguishes the shape of a laser beam trace and provides the command to a robot corresponding to the drawn figure. The proposed system has been applied to the mobile robot, and shows its effectiveness by steering successfully.     

面向服务优化组合的云双链结构

将区块链技术用于云制造平台,可使其具备资源管理去中心化、数据分布式存储、平台鲁棒的特性,然而在服务优化组合的实施过程中,其面临资源需中心化调度,数据录入依赖于区块生成时刻,执行方案缺乏动态适应性等问题。因此,提出面向服务优化组合的云双链结构（cloud dual-chain）。cloud dual-chain由制造服务链（manufacturing service chain,MSC）和过程数据链（process data chain,PDC）构成,将服务资源和组合方案进行分链管理,使云制造平台兼顾区块链特性及真实服务协同需求。cloud dual-chain的制造服务由企业自身管理,由智能合约根据任务顺序筛选形成MSC链,兼顾分布式和中心化管理;PDC基于服务组合方案产生,其节点可并行记录过程数据;若出现失效服务,在相应MSC节点中调用新服务,并在PDC节点中更新信息以确保执行方案具有动态适应性。实验表明,cloud dual-chain可实现服务的灵活管理、过程数据分布式并行录入,并赋予执行方案动态适应性。cloud dual-chain可为云制造平台的发展提供有效支持。     

光学频率梳及光钟的实现

本文主要介绍了基于锁模飞秒脉冲激光器的光学频率梳的基本原理及应用,并阐述了飞秒脉冲激光器的锁模原理及实现锁模的方法。对光钟的基本原理和实现光钟的条件及相关技术做了详细的论述,并描述了光钟的各个组成部分和系统实现的原理。     

TweezPal - Optical tweezers analysis and calibration software

Optical tweezers, a powerful tool for optical trapping, micromanipulation and force transduction, have in recent years become a standard technique commonly used in many research laboratories and university courses. Knowledge about the optical force acting on a trapped object can be gained only after a calibration procedure which has to be performed (by an expert) for each type of trapped objects. In this paper we present TweezPal, a user-friendly, standalone Windows software tool for optical tweezers analysis and calibration. Using TweezPal, the procedure can be performed in a matter of minutes even by non-expert users. The calibration is based on the Brownian motion of a particle trapped in a stationary optical trap, which is being monitored using video or photodiode detection. The particle trajectory is imported into the software which instantly calculates position histogram, trapping potential, stiffness and anisotropy.

Program summary

Program title: TweezPalCatalogue identifier: AEGR_v1_0Program summary URL:http://cpc.cs.qub.ac.uk/summaries/AEGR_v1_0.htmlProgram obtainable from: CPC Program Library, Queen's University, Belfast, N. IrelandLicensing provisions: Standard CPC licence, http://cpc.cs.qub.ac.uk/licence/licence.htmlNo. of lines in distributed program, including test data, etc.: 44 891No. of bytes in distributed program, including test data, etc.: 792 653Distribution format: tar.gzProgramming language: Borland DelphiComputer: Any PC running Microsoft WindowsOperating system: Windows 95, 98, 2000, XP, Vista, 7RAM: 12 MbytesClassification: 3, 4.14, 18, 23Nature of problem: Quick, robust and user-friendly calibration and analysis of optical tweezers. The optical trap is calibrated from the trajectory of a trapped particle undergoing Brownian motion in a stationary optical trap (input data) using two methods.Solution method: Elimination of the experimental drift in position data. Direct calculation of the trap stiffness from the positional variance. Calculation of 1D optical trapping potential from the positional distribution of data points. Trap stiffness calculation by fitting a parabola to the trapping potential. Presentation of X-Y positional density for close inspection of the 2D trapping potential. Calculation of the trap anisotropy.Running time: Seconds     

球坐标的标定

文章主要讲述了用标准光栅标定双频激光干涉仪和经伟仪组成的球坐标,通过数据处理可以得到球坐标的矢径和空间两点的相对位置,并进一步分析其测量精度和影响测量精度的各个因素。     

Absolute calibration of an ABB IRB 1600 robot using a laser tracker

The absolute accuracy of an ABB IRB 1600 industrial robot is improved using a 29-parameter calibration model, developed after extensive experimentation. The error model takes into account all possible geometric errors (25 geometric error parameters to be identified through optimization, in addition to the pose parameters for the base and tool frames and four error parameters related to the compliance in joints 2, 3, 4 and 5). The least squares optimization technique is used to find the 29 error parameters that best fit the measures acquired with a laser tracker. Contrary to most other similar works, the validation of the robot's accuracy is performed with a very large number of measures (1,000) throughout the complete robot's joint space. After calibration, the mean/maximum position errors at any of eight different measurement points on the end-effector (all offset from axis 6 by approximately 120 mm) are reduced from 0.968 mm/2.158 mm respectively, to 0.364 mm/0.696 mm.     

计算机支持下的协同工作的研究现状综述

计算机支持的协同工作主要是研究如何利用网络通信、多媒体和计算机技术,支持工作群体成员在共享环境下的协同工作、共同完成某项任务,近年来发展十分迅速。在总结国际国内 ＣＳＣＷ研究工作的基础上,对ＣＳＣＷ的模型、通信协议、协作机制的实现方法、同步机制、人机交互接口和ＣＳＣＷ的应用等等各方面的主要内容和研究现状做了一全面的综述,以期对我国ＣＳＣＷ的研究与发展能起到一定的推动作用。     

Optical correlator for recognizing characters printed on paper

Pattern recognition is an example of data processing for which analog processors are well suited. We can optically classify various and complicated patterns in one operation instantaneously. Unfortunately, most information is written or printed on paper. From this reason they are not suited to conventional coherent processing. In this paper a coherent optical processor which is capable of recognizing characters printed on paper is presented. It is based on quasi Fourier holography adapted to diffuse illumination of optical signals. In this case the recognition correctness is diminished a little. The experiments are carried out with conventional print letters.     

Proactive human–robot collaboration: Mutual-cognitive,predictable, and self-organising perspectives

Human–Robot Collaboration (HRC) has a pivotal role in smart manufacturing for strict requirements of human-centricity, sustainability, and resilience. However, existing HRC development mainly undertakes either a human-dominant or robot-dominant manner, where human and robotic agents reactively perform operations by following pre-defined instructions, thus far from an efficient integration of robotic automation and human cognition. The stiff human–robot relations fail to be qualified for complex manufacturing tasks and cannot ease the physical and psychological load of human operators. In response to these realistic needs, this paper presents our arguments on the obvious trend, concept, systematic architecture, and enabling technologies of Proactive HRC, serving as a prospective vision and research topic for future work in the human-centric smart manufacturing era. Human–robot symbiotic relation is evolving with a 5C intelligence — from Connection, Coordination, Cyber, Cognition to Coevolution, and finally embracing mutual-cognitive, predictable, and self-organising intelligent capabilities, i.e., the Proactive HRC. With proactive robot control, multiple human and robotic agents collaboratively operate manufacturing tasks, considering each others’ operation needs, desired resources, and qualified complementary capabilities. This paper also highlights current challenges and future research directions, which deserve more research efforts for real-world applications of Proactive HRC. It is hoped that this work can attract more open discussions and provide useful insights to both academic and industrial practitioners in their exploration of human–robot flexible production.     

基于中间节点预测的卫星光通信精确跟踪控制系统设计

针对现有卫星光通信跟踪控制系统存在光通信信号数据分割误差大,跟踪控制精度降低的问题,提出基于中间节点预测的卫星光通信精确跟踪控制系统设计;采用DPS嵌入式技术构建基于中间节点预测数据处理的硬件平台,利用MCU作为中间节点预测数据的指挥调度单元;将CDD光学传感器应用于光通信光谱信号特征采集单元;通过STM32F103RBT6主控对CDD光学传感器的高精度光通信光谱特征信号处理;通过73M2901CE-IGV/F跟踪信号精度调制IC完成对高精度跟踪信号的控制调节;对设计系统控制精度的多场景进行测试;数据表明,设计系统能够支持光通信信号强度大于32％小于50％的条件下,保持通信跟踪控制指标为0.92,最大化接近标准指标量1,在600个测试数据量下,所设计系统的检测耗时为1.2s,说明所设计跟踪控制的精度较高,控制耗时较短,满足光通信实际跟踪控制系统的应用要求.     

Generalizing prefix filtering to improve set similarity joins

Identification of all pairs of objects in a dataset whose similarity is not less than a specified threshold is of major importance for management, search, and analysis of data. Set similarity joins are commonly used to implement this operation; they scale to large datasets and are versatile to represent a variety of similarity notions. Most methods proposed so far present two main phases at a high level of abstraction: candidate generation producing a set of candidate pairs and verification applying the actual similarity measure to the candidates and returning the correct answer. Previous work has primarily focused on the reduction of candidates, where candidate generation presented the major effort to obtain better pruning results. Here, we propose an opposite approach. We drastically decrease the computational cost of candidate generation by dynamically reducing the number of indexed objects at the expense of increasing the workload of the verification phase. Our experimental findings show that this trade-off is advantageous: we consistently achieve substantial speed-ups as compared to known algorithms.     

浅谈光纤通信新技术的应用与研究

在长途通信网和市话通信网中光纤通信网代替电缆通信网已成为被世界所公认的事实。此时因为通信距离影响,导致利用率的不断下降,所以为光纤通信取得进一步发展,必须寻找新的途径,采用新的技术。本文首先简要概述光纤通信技术特点,然后阐明光纤通信新技术的实践应用,最后进行对光纤通信新技术的研究探讨。     

传感网络:概念，应用与挑战

Sensor network has experienced world-wide explosive interests in recent years. It combines the technology of modern microelectronic sensors, embedded computational processing systems, and modern computer and wireless networking methodologies. In this overview paper, we first provide some rationales for the growth of sensor networking. Then we discuss various basic concepts and hardware issues. Four basic application cases in the US. National Science Foundation funded Ceneter for Embedded Networked Sensing program at UCLA are presented. Finally, six challenging issues in sensor networks are discussed. Numerous references including relevant papers, books, and conferences that have appeared in recent years are given.     

The impact of AMT practices on firm performance in manufacturing SMEs

This research deals with the use of advanced manufacturing technology (AMT) in small and medium-sized enterprises (SMEs). The main purpose of this study is to find out the types of AMT to adopt to improve the manufacturing parameters that have significant impact on firm performance. In the research firstly, the current situation in AMT use in SMEs is examined. Secondly, the relationship between manufacturing parameters and firm performance is investigated. Finally, the relationship between the types of AMT and manufacturing parameters is investigated. The sampling pool includes 102 manufacturing SMEs that introduced AMTs. Our findings show that local area network, computer-aided design, and computer-aided manufacturing technologies are the most commonly used and automated storage, robotics, and wide area network technologies are the least commonly used AMTs in SMEs. In addition, the statistical association between manufacturing parameters and firm performance indicate that product design performance, fixture utilization, setup and production planning performance have positive impact, while capacity utilization and finished product inventory need have negative impact on firm performance.     

基于MOSS 2007的网络办公协作平台系统

为了提高部门的工作效率和服务水平,团队之间相互协作,及时沟通与讨论,资源共享尤为重要。本文介绍如何利用Sharepoint技术的特点和优势,构建一套简单实用的网络办公协作平台系统,具有较强的实用价值。系统开发和维护的成本低廉,有利于系统的快速开发。     

Multi-Agent技术及应用

论文主要讨论了Multi-Agent(MA)技术的体系结构、协作机制、通信模式及任务分解等关键技术,阐述了MA技术在智能交通控制系统、多机器人系统、Internet网络管理、CIMS领域、软件工程领域及计算机仿真等领域的广泛应用前景。     

浅析计算机通信网和光纤通信技术

随着人们生活水平的不断提高,对于通信技术的需要也随之提高,计算机通信网以及光纤通信技术的应用,大大提高了人们的通信高效性。该文则分别探讨计算机通信网以及光纤通信技术。