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Off-grid medium-power (1–10 W) systems require either battery-or supercapacitor-based ambient energy harvesting for sustaining their operation. Supercapacitor-based harvesters are advantageous in autonomous field systems due to their extended lifetime, easy power management, and low maintenance requirement; however, they can reach only up to 10% of the energy density of rechargeable batteries. To...
For autonomous medium power (1–10 W) field systems deployed in off-grid applications without established power infrastructure, two system design criteria are crucially important: i) continuous availability of power, ii) robust and low-maintenance operation. In this paper, we provide circuit and system designs for energy harvesters that address both issues by utilizing supercapacitors as their energy...
We study the problem of answering questions about images in the harder setting, where the test questions and corresponding images contain novel objects, which were not queried about in the training data. Such setting is inevitable in real world–owing to the heavy tailed distribution of the visual categories, there would be some objects which would not be annotated in the train set. We show...
We propose a novel method for temporally pooling frames in a video for the task of human action recognition. The method is motivated by the observation that there are only a small number of frames which, together, contain sufficient information to discriminate an action class present in a video, from the rest. The proposed method learns to pool such discriminative and informative frames, while discarding...
Multi-pitch analysis of polyphonic music requires estimating concurrent pitches (estimation) and organizing them into temporal streams according to their sound sources (streaming). This is challenging for approaches based on audio alone due to the polyphonic nature of the audio signals. Video of the performance, when available, can be useful to alleviate some of the difficulties. In this paper, we...
As the cost, size and power required by sensor devices decrease, an increasing range of applications are possible. We focus on the application of tracking accelerometer data from body worn sensors over long durations in health monitoring applications. Body worn sensors must be compact for the convenience of the patient and low power to support extended operation, but these benefits can come at the...
We present a novel framework for precisely estimating dense depth maps by combining 3D lidar scans with a set of uncalibrated camera RGB color images for the same scene. Rough estimates for 3D structure obtained using structure from motion (SfM) on the uncalibrated images are first co-registered with the lidar scan and then a precise alignment between the datasets is estimated by identifying correspondences...
Both audio and visual aspects of a musical performance, especially their association, are important for expressing players' ideas and for engaging the audience. In this paper, we present a framework for combining audio and video analyses of multi-instrument chamber music performances to associate players in the video to the individual separated instrument sources from the audio, in a score-informed...
We propose a practical combinatorial approach for addressing the challenging task of vehicle tracking in Wide area motion imagery (WAMI) by leveraging a pixel accurate co-registered vector road-map. Specifically, guided by the co-registered road network, we obtain a sparse trellis graph linking each vehicle detection (VD) in a WAMI frame with a road reachable VD in the next frame, which then allows...
Wireless power transfer is technique using which electrical power can be transferred without any physical contact between the source and the load. This paper proposes a simple, economical and efficient technique for wireless power transfer. Two different techniques available for wireless transmission of electricity and the need for a wireless system of energy transmission are discussed in this paper...
Memristor is known for its primary fundamental property called the variation of resistance with memory and time, thus memristor name combines memory plus resistor. That's why the major applications for memristors are investigated solely in the field of neuromorphic systems and memory. This paper investigates the benefits of combining CMOS logic along with memristors. It is because of the way that...
The paper presents the development of 4X1 high-definition transcranial direct current stimulation (tDCS). High-Definition Transcranial Direct Current Stimulation (HD-tDCS) has been proposed as a focal, noninvasive brain stimulation technique. In this technique, cerebral micro vessel and primary motor cortex are targeted with weak intensity direct current (approximately 2 mA) through small array of...
This paper presents a voltage-balancing back-to-back stacked multicell converter (B2B-SMC) topology, which is easy to implement, does not require auxiliary capacitor charging circuit and can be easily extended for the increased number of levels. Unidirectional switches are added in the B2B-SMC to maintain the voltage across the capacitors. The advantages of the B2B-SMC over flying capacitor multilevel...
Voltage sags and swells are one of the major power quality problems in distributed system. This paper presents a dynamic voltage restorer (DVR) based on the voltage-balanced back-to-back stacked multicell converter (B2B-SMC) with equal voltage sources topology, is easy to implement, and can be easily extended for the increased number of levels. The advantages of the B2B-SMC over flying capacitor multilevel...
Color imaging devices for capture, display, and user interaction commonly form the physical interface by which we connect to the digital cyber-world. Because these devices bridge the physical and the electronic worlds, elegant and effective solutions to problems in color imaging can often be found by the synergistic combination of physical intuition with the mathematical tools of signal and image...
Teledyne SeaBotix is developing a robotic subsea winch to be used in deep deployments of an observation class (20kg) ROV to 4000 m depths. The subsea winch system can be incorporated in a self-contained launch and recovery system or via larger vehicles like work class ROVs or submarines. High reliability is an underlying design objective in subsea systems due to the very high cost of downtime or system...
Vehicular Ad-hoc Networks (VANETs) is highly dynamic by nature because in VANETs, nodes are highly mobile. And the survey shows that the position based routing protocol is best suitable for VANETs because position based routing approach can deal with highly mobile nodes. In this paper, we propose an acute position based routing protocol (APR) for vehicular ad hoc networks (VANETs) which performs better...
We present a per-channel framework for extending monochrome barcodes to color for display applications, offering increased data rates and capacity. Data is independently encoded into barcodes, incorporated within a color image as the red (R), green (G), and blue (B) channels and decoded from the corresponding R, G, and B channels in the image of the displayed barcode captured with a smartphone. Using...
Image forensics using sensor photo-response nonuniformity (PRNU) provides a powerful method for associating an image with the camera that captured the image. To preserve privacy despite the availability of this powerful tool, we present a new framework for image anonymization. We formulate anonymization as a feasibility problem subject to multiple constraints that seek to ensure non-detectability...
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