13 research outputs found

    Emergency-call Systems Based on Human Vital and System-technical Parameters in a Smart-home Environment

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    Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich.This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.Dank der Fortschritte in der Mikrotechnologie und in der Funktechnik ist es heute möglich, besonders zuverlässige Personennotrufsysteme zu realisieren. Im vorliegenden Beitrag werden Systeme diskutiert,die im Wohnbereich Einsatz finden und zur Sicherheit und Unabhängigkeit in der gewohnten Umgebung beitragen. Speziell ältere Personen mit Behinderungen, Personen, die bereits durch Stürze oder Unfälle verunsichert sind, und hochbetagte Alleinstehende benötigen im Notfall schnelle Hilfe. Es wird der Stand der Technik bei Notrufverfahren unter besonderer Berücksichtigung des Nutzens für ältere Menschen beschrieben. Bisherige Systeme verwenden fast ausschließlich einen sogenannten Funkfinger, mit dem ein Alarm manuell ausgelöst werden kann, was sich bei manchen Notfall-Situationen jedoch als nicht genügend zuverlässig erweist. Als Alternative oder auch Ergänzung werden daher Systeme vorgeschlagen,die einen Notfall automatisch durch Messen und Auswerten von Vitalparametern erfassen und selbsttätig einen Alarm auslösen können. Ergänzend dazu lassen sich in einer Smart-Home-Umgebung mit vernetzten Komponenten weitere Parameter (sogenannte Umwelt-Parameter) zur Notrufentscheidung verwenden.Dabei zeigt sich, daß die Erkennung einer Notfallsituation um so zuverlässiger wird, je mehr Einzelparameter man zur Entscheidung heranzieht.Progress in microtechnology and radio transmission technology has enabled the development of highly reliable emergency-call systems.The present article describes systems that have been specially designed to improve the safety and independence of handicapped and elderly persons living at home. For such persons immediate help in an emergency situation is of crucial importance. The technical state of the art of emergency-call systems specially developed for use by the elderly, is briefly discussed, in particular the well-known radio emergency-call button, with the aid of which an alarm canbe activated manually. This system, however, does not offer adequate safety in all emergency situations. Alternative or complementary systems designed to automatically trigger an alarm on the basis of the recording and evaluation of so-called vital parameters, are therefore proposed. In addition, in a smart-home environment with networked devices, further parameters - so-called environment parameters can be used. It is found that the identification of an emergency situation becomes more reliable as the number of parameters employed increases

    Longitudinal Combustion Instabilities in Ramjet Engines: Identification of Acoustic Modes

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    Longitudinal combustion instabilities in liquid-fueled ramjet engines have been investigated with attention focused on determination of the acoustic mode structures. Detailed pressure measurements, including both amplitude and phase, were made at ten positions spanning the length of the engine. The experimental data have been analyzed using two linear acoustic models. Four distinct modes were observed for various inlet/combustor combinations. These results help identify the mechanisms exciting low-frequency pressure oscillations in ramjet engines

    Sensor and Actuator Needs for More Intelligent Gas Turbine Engines

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    This paper provides an overview of the controls and diagnostics technologies, that are seen as critical for more intelligent gas turbine engines (GTE), with an emphasis on the sensor and actuator technologies that need to be developed for the controls and diagnostics implementation. The objective of the paper is to help the "Customers" of advanced technologies, defense acquisition and aerospace research agencies, understand the state-of-the-art of intelligent GTE technologies, and help the "Researchers" and "Technology Developers" for GTE sensors and actuators identify what technologies need to be developed to enable the "Intelligent GTE" concepts and focus their research efforts on closing the technology gap. To keep the effort manageable, the focus of the paper is on "On-Board Intelligence" to enable safe and efficient operation of the engine over its life time, with an emphasis on gas path performanc

    Fuel-Rich Particle-Laden Plume Combustion

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