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In this contribution a machine vision inspection system is presented which is designed as a length measuring sensor. It is developed to be applied to a range of heat shrink tubes, varying in length, diameter and color. The challenges of this task were the precision and accuracy demands as well as the real-time applicability of the entire approach since it should be realized in regular industrial line production. In production, heat shrink tubes are cut to specific sizes from a continuous tube. A multi-measurement strategy has been developed, which measures each individual tube segment several times with sub pixel accuracy while being in the visual field. The developed approach allows for a contact-free and fully automatic control of 100% of produced heat shrink tubes according to the given requirements with a measuring precision of 0.1mm. Depending on the color, length and diameter of the tubes considered, a true positive rate of 99.99% to 100% has been reached at a true negative rate of > 99.7.
Purpose – To describe the development of a novel polyether(meth)acrylate-based resin material class for stereolithography with alterable material characteristics.
Design/methodology/approach – A complete overview of details to composition parameters, the optimization and bandwidth of mechanical and processing parameters is given. Initial biological characterization experiments and future application felds are depicted. Process parameters are studied in a commercial 3D systems Viper stereolithography system, and a new method to determine these parameters is described herein.
Findings – Initial biological characterizations show the non-toxic behavior in a biological environment, caused mainly by the (meth)acrylate-based core components. These photolithographic resins combine an adjustable low Young’s modulus with the advantages of a non-toxic (meth)acrylate-based process material. In contrast to the mostly rigid process materials used today in the rapid prototyping industry, these polymeric formulations are able to fulfll the extended need for a soft engineering material. A short overview of sample applications is given.
Practical implications – These polymeric formulations are able to meet the growing demand for a resin class for rapid manufacturing that covers a bandwidth from softer to stiffer materials.
Originality/value – This paper gives an overview about the novel developed material class for stereolithography and should be therefore of high interest to people with interest in novel rapid manufacturing materials and technology.
Das Fraunhofer Institut für Intelligente Analyse- und Informationssysteme (IAIS) entwickelt im Projekt ProfiBot ein modulares Roboterbaukastensystem für die berufliche Mechatronikausbildung. Es wird durch das Bundesministerium für Bildung und Forschung (BMBF) gefördert. Diese Arbeit hat die Entwicklung eines Systems zum Ziel, mit dem es möglich ist, einen ProfiBot-Roboter an einer Dockingstation zu positionieren und eine Ladung der Akkus durchzuführen. Dies umfasst die Entwicklung der Algorithmen und Architekturen zur Navigation, die Konstruktion und die Herstellung der Dockingstation. Das System wurde so konzipiert, dass es sich gegenüber verschiedenen Störfaktoren, wie beispielsweise unterschiedlichen Lichtverhältnissen, Bodenbeschaffenheiten oder markanten Objekten im Raum, robust verhält.
The article presents a solution to detect rotor position at stand still condition for all types of permanent magnet brushless dc motors. The solution provides both secure and fast method for starting of the brushless motor, that is independent on the sensorless control scheme used. Nonlinearities found in standard three phase permanent magnet dc motor are used to derive the rotor position at stand still. The described solution assumes that there is availability of the neutral point of the three phase star motor windings.
Kompakt-Training E-Business
(2007)
Fixed-dose combination of pioglitazone and glimepiride in the treatment of Type 2 diabetes mellitus
(2007)
Prozessmanagement
(2007)
Grid Infrastrukturen sind heute in der Lage, auch große Datenmengen verteilt zu verarbeiten. Ein Anwendungsgebiet, das davon profitiert, ist das Textmining. Es zeichnet sich vor allem durch die große Anzahl voneinander unabhängiger Teiljobs aus, in die eine Aufgabe zerlegt werden kann. Um die Gesamtlaufzeit bis zur Fertigstellung eines Textmininglaufes für einen großen Datenbestand zu optimieren, ist Load-Balancing unerlässlich. Dafür muss abgeschätzt werden, wie lange eine Ressource für die Lösung eines Teilproblems benötigt. Diese Abschätzungen beruhen auf den Aufzeichnungen vorangegangener Textminingverarbeitungen. Sind darüber noch keine Daten vorhanden, muss die Laufzeitvorhersage anhand der Leistungsfähigkeit der Hardware einer Ressource prognostiziert werden. Wir stellen in dieser Arbeit Methoden vor, mit denen die Laufzeit für Textmining-Applikationen mittels historischer Daten und Hardwareeigenschaften vorhergesagt werden kann. Dabei nutzen wir Methoden der Statistik und des maschinellen Lernens, um eine Prognose zu berechnen. Anschließend wird ein Dienst vorgestellt, der eine Laufzeitvorhersage im Grid anbietet. Er kann auch für andere Anwendungsgebiete als das Textmining eingesetzt werden und ist in der Lage, Informationen über die Laufzeiten von Jobs auf den Ressourcen abzurufen. Dazu nutzt er bereits vorhandene Dienste der Grid-Middleware und kann sich so dynamisch in bestehende Strukturen eingliedern.
Data management is a challenge in both scientific and technical environments. Therefore researchers have developed a special interest in this field. Modern approaches (i.e. Subversion, CVS) already offer authoring and versioning in distributed systems. However this might be insufficient in a vast number of scenarios, where not only the data resulting from a process, but also data which describes the process that generated those results is crucial.
Structural and Dynamical Properties of Polystyrene Determined by Coarse-Graining MD Simulations
(2007)
We present results from a detailed study of a new, optimized coarse-grained (CG) model of polystyrene (PS) and compare it with a recently published one (Harmandaris et al., Macromolecules 2006, 39, 6708). We will explain in detail, what led us to a different mapping scheme and put that into the general framework, with special emphasis on the aspect of time mapping. The new model is tested against the structural and dynamic properties of PS, resulting from atomistic simulations.
Comparison Between Coarse-Graining Models for Polymer Systems: Two Mapping Schemes for Polystyrene
(2007)
During the past few years, fast changes in the economic environment and massive technological developments in the field of information technology constitute challenges for many companies. The growing capabilities to collect and store loads of internal and external data make it more and more difficult for a business’s management to find the realyy important pieces of information. This situation of information overload is tackeled by a variety of analytic concepts and tools which can be subsumed under the opalescent term of “Business Intelligence”.
In this paper, we describe an approach to academic teaching in computer science using storytelling as a means for background research to hypermedia and virtual reality topics. It is shown that narrative activity within the context of a Hypermedia Novel related to educational content can enhance motivation for self-conducted learning and in parallel lead to an edutainment system of its own. The narrative practice and background research as well as the resulting product can supplement lecture material with comparable success to traditional academic teaching approaches.
Holzfahrrad im Eigenbau
(2007)
The prototype of a workflow system for the submission of content to a digital object repository is here presented. It is based entirely on open-source standard components and features a service-oriented architecture. The front-end consists of Java Business Process Management (jBPM), Java Server Faces (JSF), and Java Server Pages (JSP). A Fedora Repository and a mySQL data base management system serve as a back-end. The communication between front-end and back-end uses a SOAP minimal binding stub. We describe the design principles and the construction of the prototype and discuss the possibilities and limitations of work ow creation by administrators. The code of the prototype is open-source and can be retrieved in the project escipub at http://sourceforge.net/ .
In the presented project, new approaches for the prevention of hand movements leading to hazards and for non-contact detection of fingers are intended to permit comprehensive and economical protection on circular saws. The basic principles may also be applied to other machines with manual loading and/or unloading. Two new detection principles are explained. The first is the distinction between skin and wood or other material by spectral analysis in the near infrared region. Using LED and photodiodes it is possible to detect fingers and hands reliable. With a kind of light curtain the intrusion into the dangerous zone near the blade can be prevented. The second principle is video image processing to detect persons, arms and fingers. In the first stage of development the detection of upper limb extremities within a defined hazard area by means of a computer based video image analysis is investigated.
Policy based resource management for QoS aware applications in heterogeneous network environments
(2007)
Dynamic configuration and adaptation of resources for QoS-aware applications in heterogeneous access network environment (UMTS, WIMAX, WLAN DVB-T, DVB-H) using automated tools is a challenge today. The focus of this paper is a toolkit for intelligent management of resource allocation in heterogeneous network infrastructures based on policies of different actors (network operator, service providers and users). Policy based management of resources for QoS-aware applications (Video-on-Demand, Mobile TV) dependent on network capabilities, context learning and preferences of the policy actors is proposed, which enhances the current state-of-the-art and IETF standardisation. The policy management toolkit includes components for policy specification, adaptation and enforcement, which are interacting using policy repository. The design allows the automated resource adaptation for QoS based applications based on context information and hierarchical dependencies of policy actors. A learning component is integrated in order to discover the context considering measurement and monitoring data. The policy management tookit is discussed, emphasising on ontology driven policy repository design, context learning and flexible scenario-oriented management interfaces for policy specifications.
Phase Space Rendering
(2007)
A reference model is always developed in order to support a specific purpose. The development environment is setting the broader context. Limitations are not only set by size and experience of the modeler team or by budget and time constraints. The intended usage scenario also defines the fundamental contour of a reference model. During the practical work with reference models, a range of key issues has come up to increase the suitability of reference models for daily use. As the result of many projects, the authors have summarized the key issues and formulated critical success factors for reference modeling projects.
Investition und Finanzierung
(2007)