We present a factor analysis method that accounts for possible temporal misalignment of the factor loadings across the population of samples. Our main hypothesis is that the data contains a subset of variables with si...
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Turning is one of the most important maneuvers for biological and robotic fish. In our group's prior work, an analytical framework was proposed for modeling the steady turning of fish, given asymmetric, periodic b...
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ISBN:
(纸本)9781424450381;9781424450404
Turning is one of the most important maneuvers for biological and robotic fish. In our group's prior work, an analytical framework was proposed for modeling the steady turning of fish, given asymmetric, periodic body/tail movement or deformation. However, the approach was not illustrated with simulation or validated with experiments. The contributions of the current paper are three fold. First, an extension to the modeling framework is made with a more rigorous formulation of the force balance equation. Second, we have worked out two examples explicitly, one with an oscillating, rigid tail, and the other with a flexible tail having a uniform curvature, and compared their turning behaviors through numerical results. Third, for model validation purposes, a robotic fish prototype has been developed, with the tail shaft controlled precisely by a servo motor. For a rigid tail, experimental results have confirmed the model prediction that, for the tested range, the steady-state turning radius and turning period decrease with an increasing bias in the tail motion, and that the turning period drops with an increasing tail beat frequency. We have also found that, with a flexible fin attached to the tail shaft, the robot can achieve faster turning with a smaller radius than the case of a rigid fin, and modeling within the same framework is underway to understand this phenomenon.
We present a mobile platform for body sensor networking based on a smartphone for lightweight signal processing of sensor mote data. The platform allows for local processing of data at both the sensor mote and smartph...
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There has been compelling evidence that outpatients, especially those who are elderly or taking multiple complexly scheduled drugs, are not taking their medicines as directed, leading to unnecessary disease progressio...
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There has been compelling evidence that outpatients, especially those who are elderly or taking multiple complexly scheduled drugs, are not taking their medicines as directed, leading to unnecessary disease progression, complications, functional disabilities, lower quality of life, and even mortality. Existing technologies for monitoring and improving drug adherence are either costly or too complicated for general patients to use. In this paper, we introduce the detailed design and the complete prototype of a marketable Radio-Frequency Identification (RFID)-based Medication Adherence Intelligence System (RMAIS) that can be conveniently used at a residential home by ordinary patients. RMAIS is designed to maintain patients' independence and enable them to take multiple daily medicine dosages of the right amount at the right time. The system is patient-centered and user-friendly by reminding a patient of the prescribed time for medication and dispensing it in a fully automatic and fool-proof way. This is achieved mainly due to its novel design of a motorized rotation platform and the smooth integration of a scale, an RFID reader, and the rotation platform. In addition, this system has an Internet-based notification function that is used to alert the patient when it is time to take medicine as well as report deviations from the prescribed schedule to the primary care physicians or pharmacists.
Discovering unknown adverse drug reactions (ADRs) as early as possible is highly desirable. Current methods largely rely on passive spontaneous reports, which suffer from serious underreporting, latency, and inconsist...
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A new method for generating customized microwave pulses is proposed and demonstrated in this work. The method employs tailored microstrip lines that have been designed using an exact analytical series solution of the ...
A new method for generating customized microwave pulses is proposed and demonstrated in this work. The method employs tailored microstrip lines that have been designed using an exact analytical series solution of the synthesis problem derived from the coupled-mode theory. This solution allows the synthesis of waveguides and transmission lines with arbitrary impulse responses limited only by the principles of causality, passivity, and stability. Time-domain measurements are performed demonstrating the generation of two pulses that molds the incoming energy using microstrip circuits and satisfying pre-established ultra-wideband (UWB) mask requirements intended for broadband applications. Moreover, an approach to obtain a significantly more compact solution is included.
The suitability of the recently proposed Quasi-Floating Gate (QFG) technique for processing physiological signals, and specially to stabilize baseline wandering in a simple and efficient manner, is addressed. As an ex...
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The suitability of the recently proposed Quasi-Floating Gate (QFG) technique for processing physiological signals, and specially to stabilize baseline wandering in a simple and efficient manner, is addressed. As an example of the usefulness of these techniques in biomedical signal processing, an ECG preamplifier is designed, fabricated in a 0.5μm CMOS process, and tested. Measurement results confirm the validity of this approach.
A class AB tunable transconductor is presented, featuring low quiescent power consumption. Class AB operation is achieved using quasi-floating gate transistors. Highly linear tuning is obtained using resistive divider...
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A class AB tunable transconductor is presented, featuring low quiescent power consumption. Class AB operation is achieved using quasi-floating gate transistors. Highly linear tuning is obtained using resistive dividers implemented by transistors operating in triode region. Simulation results for a low-cost 0.5μm standard CMOS process are presented, validating the proposed approach.
A compact analog multiplier/divider circuit operating in current-mode is presented featuring low supply voltage, low area requirements and wide dynamic range. It is suited to standard digital CMOS processes and can be...
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A compact analog multiplier/divider circuit operating in current-mode is presented featuring low supply voltage, low area requirements and wide dynamic range. It is suited to standard digital CMOS processes and can be successfully employed in a wide range of analog signal processing applications. Measurement results for a 0.5 μm CMOS test chip prototype are presented. The circuit consumes 120 μW using a single supply voltage of 1.5 V and requires a silicon area of 150μm × 140μm.
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