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DTSTART;TZID=America/New_York:20230821T100000
DTEND;TZID=America/New_York:20230821T110000
DTSTAMP:20260404T050023
CREATED:20230808T194307Z
LAST-MODIFIED:20230808T194307Z
UID:10007630-1692612000-1692615600@seasevents.nmsdev7.com
SUMMARY:MEAM Ph.D. Thesis Defense: "Mobile Wireless Infrastructure on Demand in Robot Teams"
DESCRIPTION:Communication is fundamental to successful coordination in teams of robots. Indeed\, the promise that robot teams can complete tasks faster and more efficiently than any single agent depends on their ability to share information and effectively coordinate their actions. Today\, teams of mobile robots are increasingly being deployed to tackle challenging tasks in environments without existing network infrastructure\, relying instead on peer-to-peer communication. While there exists a considerable body of research dedicated to maintaining network connectivity\, we still lack methods that are efficient\, scalable\, and practical. In this thesis we take a number of steps to address these challenges. First\, we formalize the problem of Mobile Infrastructure on Demand (MID)\, wherein a team of mobile robots are deployed to create and sustain a wireless network that supports the communication requirements of a different set of task-oriented robots collaborating to accomplish an objective. This approach decouples the task planning and network maintenance problems and allows us to focus on developing algorithms for the communication/MID team that are task agnostic\, enabling a large class of multi-robot algorithms to function without existing network infrastructure. Second\, we demonstrate a data driven approach to the MID agent placement problem using convolutional neural networks (CNNs) that achieves comparable performance to an optimization based expert in a fraction of the time and scales to large teams. Finally\, we introduce a complete solution to the MID problem that optimizes the position of mobile network relay nodes to directly improve the performance of the underlying routing protocol. We demonstrate our system in a set of experiments with ground robots equipped with 802.11 WiFi radios performing situational awareness and multi-robot exploration.
URL:https://seasevents.nmsdev7.com/event/meam-ph-d-thesis-defense-mobile-wireless-infrastructure-on-demand-in-robot-teams/
LOCATION:216 Moore Building
CATEGORIES:Doctoral,Dissertation or Thesis Defense
ORGANIZER;CN="Mechanical Engineering and Applied Mechanics":MAILTO:meam@seas.upenn.edu
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20230822T100000
DTEND;TZID=America/New_York:20230822T113000
DTSTAMP:20260404T050023
CREATED:20230807T180903Z
LAST-MODIFIED:20230807T180903Z
UID:10007626-1692698400-1692703800@seasevents.nmsdev7.com
SUMMARY:MEAM Seminar: "Photophoretic Levitating Structures Enabling Mesospheric and Martian Exploration"
DESCRIPTION:Studying certain regions of the atmosphere is hindered by available propulsion technologies. For example\, the mesosphere\, ranging from about 50 to 80 km in altitude\, has air too thin for aerodynamic and buoyant flight but air too dense for satellites and orbital flight due to drag. The Martian atmosphere is another region where no flight mechanisms currently operate besides the short-term flight of the Mars Helicopter. We propose a novel flight mechanism utilizing only light and no moving parts to allow macroscale structures to achieve photophoretic levitation. Photophoretic levitation refers to flight enabled through light-induced movement of gas particles that create lift forces and is optimized in the terrestrial mesosphere and on Mars. We previously demonstrated the possibility of levitating centimeter-scale disks and plates of microfabricated materials for early levitation testing\, fabrication\, and theory development. Now\, we show the scalability of this mechanism to carry theoretical payloads of up to 10 kg in the upper atmosphere. This scalability is plausible by expanding the nearly 2D materials to meter-scale 3D structures like spheres and cones made of the same ultrathin\, ultralight materials. We will discuss the architecture of photophoretic aircraft and their scalability to kg-size payloads\, as well as the fabrication\, testing\, and simulations behind these discoveries. The applications include in situ measurements in the upper atmosphere through deployment from missions like current NASA balloons or sounding rockets. Ultimately\, deploying an array of photophoretic aircraft represents new and cost-effective means of remotely sensing winds\, temperature\, and gas concentrations in the Martian atmosphere and the mesosphere through different sensing mechanisms.
URL:https://seasevents.nmsdev7.com/event/meam-seminar-photophoretic-levitating-structures-enabling-mesospheric-and-martian-exploration/
LOCATION:Towne 337
CATEGORIES:Seminar
ORGANIZER;CN="Mechanical Engineering and Applied Mechanics":MAILTO:meam@seas.upenn.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20230822T140000
DTEND;TZID=America/New_York:20230822T160000
DTSTAMP:20260404T050023
CREATED:20230807T144343Z
LAST-MODIFIED:20230807T144343Z
UID:10007624-1692712800-1692720000@seasevents.nmsdev7.com
SUMMARY:BE Doctoral Dissertation Defense: "The Role of Collagen XII in Establishing Tendon Cell Organization\, Hierarchical Structure\, and Mechanical Function During Tendon Development" (Ashley Fung)
DESCRIPTION:The Department of Bioengineering at the University of Pennsylvania and Dr. Lou Soslowsky are pleased to announce the Doctoral Dissertation Defense of Ashley Fung.\n\n\n\n\nTitle: The Role of Collagen XII in Establishing Tendon Cell Organization\, Hierarchical Structure\, and Mechanical Function During Tendon Development\nAdvisor: Dr. Lou Soslowsky\nDate: Tuesday\, August 22\nTime: 2pm\nLocation: CRB Austrian Auditorium\nZoom link: https://upenn.zoom.us/j/94851744190?pwd=a3Z4VDdGSFlrZlpGaHg4dlRiU3JMUT09\n\nThe public is welcome to attend.
URL:https://seasevents.nmsdev7.com/event/be-doctoral-dissertation-defense-the-role-of-collagen-xii-in-establishing-tendon-cell-organization-hierarchical-structure-and-mechanical-function-during-tendon-development-ashley-fung/
LOCATION:CRB Auditorium\, 415 Curie Boulevard\, Philadelphia\, PA\, 19104\, United States
CATEGORIES:Doctoral,Graduate,Student,Dissertation or Thesis Defense
ORGANIZER;CN="Bioengineering":MAILTO:be@seas.upenn.edu
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20230824T103000
DTEND;TZID=America/New_York:20230824T113000
DTSTAMP:20260404T050023
CREATED:20230811T132042Z
LAST-MODIFIED:20230811T132042Z
UID:10007632-1692873000-1692876600@seasevents.nmsdev7.com
SUMMARY:MEAM Seminar: "Vibrating Beam MEMS Accelerometers for Gravity and Seismic Measurements"
DESCRIPTION:Advances in microelectromechanical systems (MEMS) have enabled the widespread development of sensors for a variety of consumer\, automotive\, and wearable healthcare electronics applications. However\, there is increasing interest in the development of highly accurate MEMS inertial sensors for a variety of emerging applications\, for e.g.\, navigation systems for pedestrians and autonomous vehicles\, and seismic and gravity imaging\, where the traditional attributes of MEMS (miniaturization and system integration) are combined with scalable transduction principles to enable highly accurate physical measurements. Resonant approaches to measurement of forces and displacements in MEMS devices have enabled significant advances in accuracy of MEMS inertial sensors in recent years\, assisted by parallel advances in wafer-level encapsulation techniques\, interface circuits\, and approaches to mitigate temperature sensitivity\, also applied to products in MEMS timing and frequency control. This talk will describe the evolution of vibrating beam MEMS accelerometers demonstrating exceptional long-term stability for applications in gravimetry and seismology. Device sensitivity and stability is demonstrated through the tracking of Earth tides and recording of ground motion corresponding to a number of seismic events. MEMS-based gravity instruments are now being developed for applications such as geotechnical surveying\, planetary exploration\, and CO2 storage\nmonitoring. These results demonstrate the potential of vibrating beam MEMS accelerometers for high-resolution and stable measurements with wider implications for precision measurement employing other resonant-output MEMS devices such as gyroscopes and magnetometers.
URL:https://seasevents.nmsdev7.com/event/meam-seminar-vibrating-beam-mems-accelerometers-for-gravity-and-seismic-measurements/
LOCATION:Towne 337
CATEGORIES:Seminar
ORGANIZER;CN="Mechanical Engineering and Applied Mechanics":MAILTO:meam@seas.upenn.edu
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