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Magnetic nanoparticle (MNP) thermometry will be necessary for safe therapeutic implementation of magnetic nanoparticle hyperthermia, a developing cancer treatment. One realization of a MNP thermometer works by detecting harmonic signal (the fundamental f and 3f harmonics) generated by MNPs exposed to ac magnetic field. In this paper, we aim to measure accurately the harmonic signal in a MNP thermometer,...
This paper presents a vibration control design to the string-tip-mass system by using a non-symmetric peak-detector mechanism. Previously, this peak-detector system was used as an easy algorithm to mitigate vibration on a real flexible structure. Moreover, its mathematical representation is simple and it just has two parameters to tune. Following this former experience, we adequate this strategy to...
The transport of intensity equation (TIE) has established the relationship between the phase of an optical field and the variation of its intensity along the direction of propagation. In this paper, a new method based on TIE used for two-wavelength phase retrieval has been proposed. The TIE is solved by employing the regularized Fourier-transform-based-approach under two separate wavelengths, gaining...
The signals of magnetic encoders (MEs) are a pair sinusoidal waves: a sine wave and a cosine wave. Due to many different causes, they contain error factors such as offsets, amplitude differences, phase shifts, and random noise. This paper proposes auto-calibration and noise-reduction methods to reduce these errors and to estimate the positions of MEs. This method includes auto-calibration and adaptive-bandwidth...
Modern scientific experimental facilities such as x-ray light sources increasingly require on-demand access to large-scale computing for data analysis, for example to detect experimental errors or to select the next experiment. As the number of such facilities, the number of instruments at each facility, and the scale of computational demands all grow, the question arises as to how to meet these demands...
We demonstrate that a field effect transistor (FET) operating as THz or far infrared sensor could be used as a sensitive spectrometer when exposed to a strong tunable local oscillator signal with the varying frequency and phase. The FET nonlinearity results in the detected signal being enhanced by the local oscillator power and proportional to the cosine of the phase difference between the local oscillator...
Big GPS data from the moving vehicles allow understanding the transportation systems in more details and at a vehicle level. While only depending on the trajectory and speed data from probe vehicles cannot estimate the traffic states (vehicle densities etc.) in real-time with the classical filtering methods, such as particular filtering (PF) and extended Kalman filtering (EKF), because the boundary...
This paper presents a thermal THz detector based on commercial CMOS technology working at room temperature consisting of a loop antenna and a NMOS temperature sensor. The THz electromagnetic wave is absorbed by the loop antenna at first, then the absorbed energy is converted into heat via a resistor. The temperature rise of the resistor is finally detected by a NMOS temperature sensor. The physical...
This paper presents an innovative approach to investigate the inner mechanism between traffic status and crash potential based on High Definition Monitoring Systems (HDMS) data. HDMS records delicate vehicle trajectory data and characteristic details. Matched case-control method and Support Vector Machines (SVMs) were employed to identify risk status. The grid search method was utilized to find the...
Scientific computing requires trust in results. In high-performance computing, trust is impeded by silent data corruption (SDC), in other words corruption that remains unnoticed. Numerical integration solvers are especially sensitive to SDCs because an SDC introduced in a certain step affects all the following steps. SDCs can even cause the solver to become unstable. Adaptive solvers can change the...
Change detection is the process of identifying differences that have occurred in the terrain surface (EO) at different times (e.g. short time or long time changes, depending on the application). Change detection techniques vary depending on the data source — optical or radar (SAR) imagery. Since both sensors work with different geometry and frequency bands, different distortions and noises are present...
An elegant analytical method for the derivation of the non-linear mathematical model of classical Costas electric circuit with non-sinusoidal signal waveforms is presented. Resulting model is similar to classical phase-locked loop (PLL) with special waveform of the phase detector characteristic. Phase detector characteristic can be computed analytically using Fourier series representation. The method...
In the paper the analysis of the Fault Tolerant Control (FTC) of Induction Motor drive system is presented. The Direct Field Oriented Control was used for analysis the speed sensor faults detection systems based on the simple mathematical relationship with two types of the rotor speed estimators. In the diagnostic systems and in the post faulted conditions the MRASCC and NFO observers were used. Simulation...
Fully depleted thick CCDs have been designed for infrared astronomy, but their low read-out noise of the order of ã 2 e− and their considerable mass of ã 5.2g, allows novel uses for them in low energy threshold particle detection applications, such as the CONNIE and DAMIC experiments. For both experiments, a reduction of the CCD read-out noise is will produce an increase in the detection efficiency...
From their beginning, people have always been prone to hiding something. Nowadays, the need for sending hidden messages has become the matter of pride and elite knowledge of managing how to send something to someone right in front of the eyes of others without others knowing about the communication. It opens a complete new perspective of the world, parallel to the existing one, where hidden messages...
Pedestrian inertial navigation systems are nowadays integrated in all kind of location-based services. The orientation, particularly the heading estimation, is one of the most critical parts of the navigation system. The heading angle suffers from drift error. The algorithms proposed in the literature apply position corrections, which do not prevent the drift error to grow. We propose a novel landmark-based...
In this paper, we analyze the vulnerabilities due to novel integrity cyber attacks in CPS, which are modeled as a stochastic Linear Time-Invariant (LTI) system equipped with a Kalman filter, an LQG controller, and a χ2 failure detector from an attacker's standpoint. The attacks are designed by a sophisticated attacker so that the measurement residual of the compromised system coincides with the healthy...
Sparse Code Multiple Access (SCMA) is a promising multiple access technology candidate for 5G wireless communication systems. The high detection complexity is its bottleneck. Stochastic computation is an ultra-low complexity digital signal processing technique in which probabilities are represented and processed with streams of random bits. In this paper, we propose a novel low complexity stochastic...
Edge is the most used and important segmentation feature in most of the object based image processing applications. Primary challenging issues with all the edge detectors are their adaptability for different scenes, noise immunity and most importantly complexity of implementation which can hinder real time performance for high resolution images. In this paper, we have proposed a novel, efficient and...
This paper proposes a detailed evaluation of the impact of digital filters when applied to the Neutrinos Angra Experiment. The signals coming out from its front-end electronics are digitized and then sent to an FPGA where further processing might be carried out. In this context, this work proposes a set of peak amplitude estimators optimized to have minimum variance. Constrained optimization technique...
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