Activity
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The Margie and Bill Klesse College of Engineering and Integrated Design at The University of Texas at San Antonio is proud to announce the…
The Margie and Bill Klesse College of Engineering and Integrated Design at The University of Texas at San Antonio is proud to announce the…
Liked by David Akopian
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📢 POLYTECH America | June 2024 Partners Tours 📢 Nothing beats in-person contact. Last month, POLYTECH hit the road for a North American tour to…
📢 POLYTECH America | June 2024 Partners Tours 📢 Nothing beats in-person contact. Last month, POLYTECH hit the road for a North American tour to…
Liked by David Akopian
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Excited to announce the launch of the Tufts University Chapter of the National Academy of Inventors (NAI). Today we celebrated and ushered in this…
Excited to announce the launch of the Tufts University Chapter of the National Academy of Inventors (NAI). Today we celebrated and ushered in this…
Liked by David Akopian
Experience & Education
Publications
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Platform-dependent optimization considerations for mHealth applications
IS&T/SPIE
This work addresses mobile computations related to integrated inertial sensors for activity monitoring, such as accelerometers, gyroscopes, integrated global positioning system (GPS) and WLAN-based positioning, that can be used for activity monitoring. Some of the aspects will be discussed in this paper. Each of the sensing data sources has its own characteristics such as specific data formats, data rates, signal acquisition durations etc., and these specifications affect energy consumption…
This work addresses mobile computations related to integrated inertial sensors for activity monitoring, such as accelerometers, gyroscopes, integrated global positioning system (GPS) and WLAN-based positioning, that can be used for activity monitoring. Some of the aspects will be discussed in this paper. Each of the sensing data sources has its own characteristics such as specific data formats, data rates, signal acquisition durations etc., and these specifications affect energy consumption. Energy consumption significantly varies as sensor data acquisition is followed by data analysis including various transformations and signal processing algorithms. This paper will address several aspects of more optimal activity monitoring implementations exploiting state-of-the-art capabilities of modern platforms.
Other authorsSee publication -
Platform-dependent optimization considerations for mHealth applications
IS&T/SPIE
This work addresses mobile computations related to integrated inertial sensors for activity monitoring, such as accelerometers, gyroscopes, integrated global positioning system (GPS) and WLAN-based positioning, that can be used for activity monitoring. Some of the aspects will be discussed in this paper. Each of the sensing data sources has its own characteristics such as specific data formats, data rates, signal acquisition durations etc., and these specifications affect energy consumption…
This work addresses mobile computations related to integrated inertial sensors for activity monitoring, such as accelerometers, gyroscopes, integrated global positioning system (GPS) and WLAN-based positioning, that can be used for activity monitoring. Some of the aspects will be discussed in this paper. Each of the sensing data sources has its own characteristics such as specific data formats, data rates, signal acquisition durations etc., and these specifications affect energy consumption. Energy consumption significantly varies as sensor data acquisition is followed by data analysis including various transformations and signal processing algorithms. This paper will address several aspects of more optimal activity monitoring implementations exploiting state-of-the-art capabilities of modern platforms.
Other authorsSee publication -
Network delay modeling for assisted GPS
IEEE Transactions on Aerospace and Electronic Systems
Currently, conventional Global Positioning System (GPS) receivers work well in open-sky environments. However, location finding in weak-signal conditions, such as urban canyons and indoors, is challenging and has been the subject of extensive research. Assisted GPS (A-GPS) is one of the concepts that helps receivers acquire weak signals by receiving assistance data from wireless networks, such as orbital parameters, and coarse time and location references. A-GPS also improves time-to-first-fix…
Currently, conventional Global Positioning System (GPS) receivers work well in open-sky environments. However, location finding in weak-signal conditions, such as urban canyons and indoors, is challenging and has been the subject of extensive research. Assisted GPS (A-GPS) is one of the concepts that helps receivers acquire weak signals by receiving assistance data from wireless networks, such as orbital parameters, and coarse time and location references. A-GPS also improves time-to-first-fix (TTFF) through faster delivery of information that is recovered from navigation data broadcast by GPS satellites. Receiver technology developers rely on signal simulators for testing real-world scenarios. While A-GPS support has been integrated in many simulators, probabilistic models of delays occurring during assistance data delivery have not been studied properly. This paper provides a methodology of A-GPS network delay modeling that is applicable to various simulation environments. Particularly, a testbed is designed to collect delay data, model them statistically and integrate the model in a simulator. The testbed employs secure user plane location (SUPL) architecture in two modes, mobile station (MS) based (MS-based) and MS-assisted, where data channels are used to communicate A-GPS assistance data.Measurement campaigns are conducted and network delay models are derived for various representative distances between assistance servers and receivers, and for various networks that users connect to, such as LAN, WLAN, third-generation mobile telecommunication (3G), high-speed downlink packet access (HSDPA), and fourth-generation long term evolution (4G LTE), with the Transmission Control Protocol and the Internet Protocol (TCP/IP) connection between a server and a receiver
Other authorsSee publication -
A Remote Laboratory for USRP-Based Software Defined Radio
Proc.of SPIE-IS&T Electronic Imaging (Mobile Devices and Multimedia:Enabling Technologies, Algorithms and Applications 2014
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Multiple user access and testing for PreNotiS: a fast mobile event reporting solution
SPIE, Mobile Multimedia/Image Processing, Security, and Applications
The PreNotiS (preventive notification system) was proposed to address the current lack in consumer prevention and disaster informatics systems. The underscore of this letter is to propose PreNotiS as a provision of trusted proxies of information sourcing to be integral to the disaster informatics framework. To promote loose coupling among subsystems, PreNotiS has evolved into a model-view-controller (MVC) architecture via object-oriented incremental prototyping. The MVC specifies how all…
The PreNotiS (preventive notification system) was proposed to address the current lack in consumer prevention and disaster informatics systems. The underscore of this letter is to propose PreNotiS as a provision of trusted proxies of information sourcing to be integral to the disaster informatics framework. To promote loose coupling among subsystems, PreNotiS has evolved into a model-view-controller (MVC) architecture via object-oriented incremental prototyping. The MVC specifies how all subsystems and how they interact with each other. A testing framework is also proposed for the PreNotiS to verify multiple concurrent user access which might be observable during disasters. The framework relies on conceptually similar self-test modules to help with serviceability.
Other authorsSee publication
Honors & Awards
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Fellow of US National Academy of Inventors
National Academy of Inventors
Organizations
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IEEE
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- Present
More activity by David
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UT System News of the Day: "'UT inventors are addressing some of the world’s most critical challenges, in medicine, energy, artificial intelligence…
UT System News of the Day: "'UT inventors are addressing some of the world’s most critical challenges, in medicine, energy, artificial intelligence…
Liked by David Akopian
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We were pleased to host Deputy Secretary of State for Management and Resources Richard R. Verma at the Engineering City, who learned about the…
We were pleased to host Deputy Secretary of State for Management and Resources Richard R. Verma at the Engineering City, who learned about the…
Liked by David Akopian
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It’s a great time to become a Roadrunner! #UTSA is experiencing a record-breaking increase in applications and acceptances for our incoming freshman…
It’s a great time to become a Roadrunner! #UTSA is experiencing a record-breaking increase in applications and acceptances for our incoming freshman…
Liked by David Akopian
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We were out in the field yesterday! We are collecting street view imagery with our new Insta360 Pro 2 camera. We are using this tool together with Dr…
We were out in the field yesterday! We are collecting street view imagery with our new Insta360 Pro 2 camera. We are using this tool together with Dr…
Liked by David Akopian
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This Wikipedia profile of an amazing optician who can make by hand a more precise sphere than any machine reminded me of Uncle Stepan, our next door…
This Wikipedia profile of an amazing optician who can make by hand a more precise sphere than any machine reminded me of Uncle Stepan, our next door…
Liked by David Akopian
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Big congratulations to Dr. Sharon Navarro, a political science professor in the UTSA College of Liberal and Fine Arts, for being selected as a…
Big congratulations to Dr. Sharon Navarro, a political science professor in the UTSA College of Liberal and Fine Arts, for being selected as a…
Liked by David Akopian
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Excited to announce a new chapter in my academic journey as I step into the role of Associate Professor with tenure! Grateful for the incredible…
Excited to announce a new chapter in my academic journey as I step into the role of Associate Professor with tenure! Grateful for the incredible…
Liked by David Akopian
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Happy Birthday to The University of Texas at San Antonio! Incredibly proud of this momentous milestone for our university and our city.
Happy Birthday to The University of Texas at San Antonio! Incredibly proud of this momentous milestone for our university and our city.
Liked by David Akopian
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We just released the latest video in our series of oral histories of the IEEE Lone Star Section. Qusi Alqarqaz is having conversations with the…
We just released the latest video in our series of oral histories of the IEEE Lone Star Section. Qusi Alqarqaz is having conversations with the…
Liked by David Akopian
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This just came in :) https://lnkd.in/gKjtVEJM Thanks to Elie Kfoury and Jorge Crichigno #lsu #usc #SmartNICs #P4ProgrammableDevices…
This just came in :) https://lnkd.in/gKjtVEJM Thanks to Elie Kfoury and Jorge Crichigno #lsu #usc #SmartNICs #P4ProgrammableDevices…
Liked by David Akopian
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It was an honor to participate in the 2024 Commencement at Tufts University. Congratulations to the students and faculty in the School of…
It was an honor to participate in the 2024 Commencement at Tufts University. Congratulations to the students and faculty in the School of…
Liked by David Akopian
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I was honored to have the chance to share my story with the next generation of doctors in South Texas. The University of Texas Rio Grande Valley
I was honored to have the chance to share my story with the next generation of doctors in South Texas. The University of Texas Rio Grande Valley
Liked by David Akopian
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Glad to be a co-sponsor of this workshop with IERE.
Glad to be a co-sponsor of this workshop with IERE.
Liked by David Akopian
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Klesse College is a place where "all students are challenged with great academic rigor but also supported to help find their own path to success.” -…
Klesse College is a place where "all students are challenged with great academic rigor but also supported to help find their own path to success.” -…
Liked by David Akopian
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