A virtual fixture using a FE-based transformation model embedded into a constrained optimization for the dimensional inspection of nonrigid parts

Virtually mounting nonrigid parts onto their fixture is proposed by researchers to remove the need for the use of complex physical inspection fixtures during the measurement process. Current approaches necessitate the pre-processing of the free-state nonrigid part’s point cloud into a suitable finite element (FE) mesh and are limited by the use of the boundary conditions setting methods available in FE software. In addition to these limits, these approaches do not take into account the forces used to restrain the part during the inspection, as commonly mandated for aerospace panels. To address these shortcomings, this paper presents a virtual fixture method that predicts the fixed shape of the part without the aforementioned drawbacks of current approaches. This is achieved by embedding information retrieved from a FE analysis of the nominal CAD model into a boundary displacement constrained optimization. To evaluate the proposed method, two case studies on physical parts are performed using the proposed virtual fixture method to evaluate the profile and assembly force specifications of each part.     

送料框架的定位控制

分析了一种纵向、横向平面运行的定位控制方法。     

Does a watched pot boil? A time-series analysis of New York State's sex offender registration and notification law.

Despite the fact that the federal and many state governments have enacted registration and community notification laws as a means to better protect communities from sexual offending, limited empirical research has been conducted to examine the impact of such legislation on public safety. Therefore, utilizing time-series analyses, this study examined differences in sexual offense arrest rates before and after the enactment of New York State's Sex Offender Registration Act. Results provide no support for the effectiveness of registration and community notification laws in reducing sexual offending by: (a) rapists, (b) child molesters, (c) sexual recidivists, or (d) first-time sex offenders. Analyses also showed that over 95% of all sexual offense arrests were committed by first-time sex offenders, casting doubt on the ability of laws that target repeat offenders to meaningfully reduce sexual offending. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

PyxosTM技术介绍(新)

Pyxos FT协议是基于时分复用（TDM）的机制。一个Pyxos FT系统由一个Pilot和最多32个Pyxos Points组成。每一个Point分配有一个时间片，用于确定何时允许该Point使用通信介质。Pilot一次向每一个Point发送一个数据包，然后从每一个Point接收一个数据包，然后重复上述过程。这个机制本身避免了竞争和冲撞，数据在给定的时间内可以确定性地交付到目的地。     

Edge registration versus triangular mesh registration, a comparative study

This paper presents a comparative study of two techniques for registering range images. The first one consists in registering range images represented by means of compact adaptive triangular meshes. The second approach registers the same range images but represented by means of their edges. In both approaches the ICP algorithm is used to compute the registration parameters (rotation and translation). The main objective in both approaches is to register a compact representation instead of all original data points. The proposed comparative study is performed in an experimental way by using a set of real range images considering both structured and sculptured objects. Four different criteria are taken into account to perform the comparison: (1) robustness with respect to initial conditions (estimated relative positions between the range images to be registered), (2) robustness with respect to resolutions of set of points on which the ICP method is executed, (3) robustness with respect to overlapping between view fields, and (4) number of iterations versus registration error. By employing these criteria, triangular mesh based and edge based registrations are tested on several range images and results are compared with respect to the ground truth. Conclusions from these experimental results are presented.     

超分辨率重建算法综述

随着高分辨率移动设备和超高清电视的发展,对已有的低分辨率视频进行超分辨率上采样成为最近的一个研究热点.对已有的超分辨率重建算法根据输入输出方式的不同,分为多图像超分辨率重建、单图像超分辨率重建、视频超分辨率重建三大类,综述了其中每类算法的发展情况及常用算法,并对不同算法的特点分析比较.随后讨论了多图像超分辨率重建和单图像超分辨率重建方法对视频超分辨率重建方法的影响,最后展望了超分辨率重建算法的进一步发展.     

Augmented reality applications in manufacturing: a survey

Augmented reality (AR) is a novel human–machine interaction that overlays virtual computer-generated information on a real world environment. It has found good potential applications in many fields, such as military training, surgery, entertainment, maintenance, assembly, product design and other manufacturing operations in the last ten years. This paper provides a comprehensive survey of developed and demonstrated AR applications in manufacturing activities. The intention of this survey is to provide researchers, students, and engineers, who use or plan to use AR as a tool in manufacturing research, a useful insight on the state-of-the-art AR applications and developments.     

面向低维点集配准的高效最近邻搜索法

为提高点集配准效率,设计一种适用于二维/三维点集的高效最近邻搜索法.该方法根据由模型点集的各维方差所选定的维度信息,排序模型点集中的点.借助二分查找法,将数据点集中的每个点插入至排序后的模型点集中,并利用左边第一个点确定搜索范围的上确界.当在确定范围内搜索最近邻时,可根据当前结果进一步减小待搜索范围,以便快速获得各点的最近邻.最后进行的复杂度分析和实验结果对比均验证文中方法的有效性.     

How to register geographical indications in the European Community

Geographical indications (GIs) are names associated with quality products coming from specific places when the geographical origin of the products gives them specific qualities, characteristics and reputation. Geographical indications are known to be the earliest type of trademarks. Historically, they have existed as long as, if not longer than, trademarks. GIs are intended to highlight special qualities of the products through indication of their origin. They also preserve cultural traditions and, therefore, are rightly associated with protection of traditional knowledge and community rights. Since the consumers appreciate quality goods, the use of GIs allows producers to obtain market recognition and a premium price for their goods. This is one of the reasons why adequate protection of this intellectual property type is required. In the EU, GIs for agricultural products and foodstuffs are protected by EC Regulation 510/2006. In order to be protected in accordance with the Regulation, GIs must be registered. This article briefly explains the nature and benefits of GIs, and explains in more detail the registration system in the EU for European and foreign GIs established by Regulation 510/2006. This issue is significant due to the importance of protection of GIs, as part of the EU quality policy in agriculture. Reference is made to the relevant database for information on EU GIs.     

解读日本VCCI认证实验室场地注册方法和要求

该文就如何成为VCCI认可的测试实验室进行了阐述,介绍了VCCI的基本情况和实验室的会员资格申请程序,最后重点分析了每一个测试项目场地注册的技术要求以及注意事项。