International Telemetering Conference Proceedings / October 17-20, 1994 / Town & Country Hotel and Conference Center, San Diego, California / In recent years the extension of interactive simulation technology to involve simulators and live vehicles from geographically dispersed sites has produced a demand for high-bandwidth communication networks that can provide guaranteed quality of service (e.g., insured availability of bandwidth and upper bounds on end-to-end delay). This paper reviews the requirements distributed interactive simulation places on the communications infrastructure and describes the Defense Simulation Internet (DSI), a network developed by the Advanced Research Projects Agency to support distributed interactive simulations. Key features of the DSI are: more than 120 participating sites spanning Europe, the United States and Asia; use of a resource reservation mechanism to provide guaranteed quality of service; and support for communication between classified sites. Furthermore, the paper describes the internetworking protocols used in the DSI to provide guaranteed quality of service and to support transmission of classified communications. Other topics discussed in the paper are research efforts that anticipate increased load on the DSI and the relevance of the technology to the integration of the telemetry range and distributed interactive simulations.

Ein alltagstauglicher autonomer Assistenzroboter in einem gemeinsamenArbeitsumfeld mit dem Menschen erfordert, dass der Roboter sämtliche Hindernisse in seiner Umgebung wahrnimmt und diesen sicher ausweicht. Stand der Technik ist jedoch, dass meist nur 2D-Sensordaten zur Navigation herangezogen werden. Oder es werden3D-Verfahren verwendet, die ausschließlich mit einer speziellen Sensorkonfiguration arbeiten. Diese Arbeit untersucht im Rahmen des LiSA-Projekts wie 3D-Sensordaten effizient und flexibel zur sicheren Navigation eines autonomenAssistenzsystems eingesetzt werden können. Dazu wird in dieser Arbeit mit der Virtual Range Scans (VRS)-Methode ein Verfahren zurHindernisvermeidung entwickelt, das beliebige Konfigurationen von Abstandssensoren in den Hindernisvermeidungsprozess integriert. Das Verfahren nutztklassische Verfahren zur 2D-Hindernisvermeidung, um 3D-Hindernisvermeidung zu realisieren. Dadurch wird das VRS-Verfahren unabhängig von der Hindernisvermeidungsstrategie und kann flexibel bestehende Verfahren wiederverwenden. Neben der Hindernisvermeidung wird gezeigt, wie die reichereUmgebungsinformation, die in 3D-Sensordaten vorhanden ist, zur robusteren Selbstlokalisierung des Roboters genutzt werden kann. Hier wird eineffizientes Verfahren vorgestellt, das Abstandssensordaten mit 3D-Umgebungsmodellen vergleicht. Ferner wird ein Verfahren vorgestellt, das Semantikim Umfeld des Roboters verankert und sie zur Navigation des Roboters nutzt.

In this work we develop a Blast-Propellant-Facility integrated analysis study, which evaluates, by using two different approaches, the blast-related impact of an explosive accident of the Space Shuttle during the first ten seconds after launch at Kennedy Space Center. The blast-related risk associated with an explosion at this stage is high because of the quantity of energy involved in both multiple and complex processes. To do this, one of our approaches employed BlastFX®, a software system that facilitates the estimation of the level of damage to people and buildings, starting from an explosive device and rendering results through a complete report that illustrates and facilitates the evaluation of consequences. Our other approaches employed the Hopkinson-Cranz Scaled Law for estimating similar features at a more distant distance and by evaluating bigger amounts of TNT equivalent. Specifically, we considered more than 500 m and 45,400 kg, respectively, which are the range and TNT content limits that our version of BlastFX® can cover. Much research has been done to study the explosion phenomena with respect to both solid and liquid propellants and the laws that underlie the blast waves of an explosion. Therefore our methodology is based on the foundation provided by a large set of literature review and the actual capacities of an application like BlastFX®. By using and integrating the lessons from the literature and the capabilities of the software, we have obtained very useful information for evaluating different scenarios that rely on the assumption, which is largely studied, that the blast waves' behavior is affected by the distance. All of this has been focused on the Space Shuttle system, in which propellant mass represents the source of our analysis and the core of this work. Estimating the risks involved in it and providing results based on different scenarios augments the collective knowledge of risks associated with space exploration.