Faranak Davoodi - Academia.edu (original) (raw)
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Iran University of Science & Technology
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Papers by Faranak Davoodi
ArXiv, 2015
In this paper, we study a novel spatial crowdsourcing system where the workers' time availabi... more In this paper, we study a novel spatial crowdsourcing system where the workers' time availabilities and their spatial locations are known a priori. Consequently, the tasks assignment to workers is performed not only based on the current location of the human workers and the tasks available in the region, but also based on the availability of the workers during the specific times that a given task should be accepted, processed, and completed. Having the system determine the daily pattern of the workers (either by predefined questionnaires when the workers register, or by archiving data from the worker's mobile devices, or by on the road and real-time entered status data) eliminates many unsuccessful task assignments and therefore significantly increases the efficiency of the system. In the original Spatial Crowdsourcing (SC) framework, the SC-server optimizes the task assignment locally at every instance of time and whenever a new task, or a new worker, enters the system. Our...
2015 IEEE Energy Conversion Congress and Exposition (ECCE)
Moball is a spherical wind-driven exploration robot intended for in-situ observation of scientifi... more Moball is a spherical wind-driven exploration robot intended for in-situ observation of scientifically important environments, such as Arctic, Mars, and Saturn's moon Titan. Moball has three orthogonal linear generators/actuators to enable both the steering control and energy harvesting. This paper focuses on the energy harvesting circuit for the Moball's linear generator which has non-sinusoidal pulse voltage waveform. Battery charging using a capacitor-sourced buck converter is analytically and numerically investigated. The power transferred to the battery is actively regulated to maintain the stable operation. The simulation results demonstrated that stable constant current charging was achieved.
AIAA SPACE 2014 Conference and Exposition, 2014
ArXiv, 2015
In this paper, we study a novel spatial crowdsourcing system where the workers' time availabi... more In this paper, we study a novel spatial crowdsourcing system where the workers' time availabilities and their spatial locations are known a priori. Consequently, the tasks assignment to workers is performed not only based on the current location of the human workers and the tasks available in the region, but also based on the availability of the workers during the specific times that a given task should be accepted, processed, and completed. Having the system determine the daily pattern of the workers (either by predefined questionnaires when the workers register, or by archiving data from the worker's mobile devices, or by on the road and real-time entered status data) eliminates many unsuccessful task assignments and therefore significantly increases the efficiency of the system. In the original Spatial Crowdsourcing (SC) framework, the SC-server optimizes the task assignment locally at every instance of time and whenever a new task, or a new worker, enters the system. Our...
2015 IEEE Energy Conversion Congress and Exposition (ECCE)
Moball is a spherical wind-driven exploration robot intended for in-situ observation of scientifi... more Moball is a spherical wind-driven exploration robot intended for in-situ observation of scientifically important environments, such as Arctic, Mars, and Saturn's moon Titan. Moball has three orthogonal linear generators/actuators to enable both the steering control and energy harvesting. This paper focuses on the energy harvesting circuit for the Moball's linear generator which has non-sinusoidal pulse voltage waveform. Battery charging using a capacitor-sourced buck converter is analytically and numerically investigated. The power transferred to the battery is actively regulated to maintain the stable operation. The simulation results demonstrated that stable constant current charging was achieved.
AIAA SPACE 2014 Conference and Exposition, 2014