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An analytical response function is presented that is based on a perturbed Pearson-IV model for the peak shape and additional models for the first four moments of the distribution, mean, variance, skewness and kurtosis. The parametrisation of these moment models is acquired by using an evolutionary ensemble algorithm, delivering corresponding energy dependent functions for each of the moments. Using...
In the reconstruction, the misaligned geometry will cause streak artifacts which influence image quality. Here we propose a method to calibrate all the parameters simultaneously with the matrix form. In some cases, the relative position between the X-ray source and the detector is known and invariant, and then we can build a Cartesian coordinate system for the source and the detector. At the same...
A great deal of scientific research in recent years has focused on alternative neutron detection technologies to the more commonly used 3He proportional counter. One such example is a novel thermal neutron detector developed by Los Alamos National Laboratory consisting of multiple thin film10B layers combined with a double helix electrode configuration. The detector promises low manufacturing costs...
In PET image reconstruction, a point-spread-function (PSF) in the form of normal distribution is commonly used to model the detector response function. The PSF becomes asymmetrical off the center of the field-of-view. This effect has been modeled with dual-half normal distribution functions with different standard deviations on the left and right side. This method is subject to unequal noise in the...
Given the complexity of the image reconstruction procedures for Compton Camera events, especially when a 3D image is required for distributed sources in space, a simple, direct algorithmic approach is presented in this work. The developed ComptonRec package carefully handles the geometry of the conic sections to accumulate ray density distribution in a user defined voxelized volume inside the specified...
This paper deals with the theoretical andbehavioral modeling of a IR-UWB front-end system, usingMATLAB and ADS PTOLEMY simulators. The mainobjective of this paper is to make a comparative trial of thesensitivity of an integrator based energy detector and a lowpass filter based energy detector. We demonstrated that theuse of an integrator for the energy detector improve thesensitivity when several...
Recently, various techniques which adopt Random Finite Set (RFS) based techniques for the solution of the fundamental, autonomous robotic, feature based, Simultaneous Localization and Mapping (SLAM) problem, have been proposed. In contrast to their vector based counterparts, these techniques offer the advantage that feature detection, as well as the usually considered spatial, statistics can be incorporated...
This paper presents a modified negative selection algorithm for the diagnosis of disturbance in distribution electrical systems. This study analyzes voltage disturbances and high-impedance faults, based on three phase current and voltage electric measures, which are obtained at the substations. The principal application is to support operation decision aid during faults, as well as to supervise the...
This paper presents a new method for detection of a weak, near zero-Doppler signal against a clutter for a pulse-Doppler radar. The proposed detector exploits clutter traits i.e. limited span of an intensity and a phase shift. An estimation of distributions of these parameters allows distinguishing a clutter alone and a useful signal against the clutter. Performed simulations revealed that a significant...
X-ray in-line phase contrast computed tomography (PC-CT) can provide imaging contrast that is orders of magnitude better than conventional absorption-based CT and has attracted some interest in many fields such as life science, medicine and biomedical engineering. In conventional methods, PC-CT needs two rotation scans to retrieve the phase line integral projection from the recorded original data...
We reported a new low-frequency active vibration isolation system called by compound pendulum which is mainly composed of a pair of two-dimensional elastic reeds and two pendulums. The response to the ground horizontal and tilt vibration of the compound pendulum is investigated. The simulations show that the compound pendulum is not only sensitive to low-frequency tilt vibration but also restrains...
In this work, we present a comparative evaluation of various ‘tracking-by-detection’ approaches on public datasets. The work investigates popular sequential Monte Carlo and template ensemble based trackers coupled with relevant visual people detectors with emphasis on exhibited performance variation depending on tracker-detector choice. Extensive experimental results are provided on public dataset...
We present a generic formulation of self- and cross-correcting Bayesian trackers using a Dynamic Bayesian Network. Correction operations in a tracker such as parameter tuning, model updates and re-initialization are represented using hidden variables together with the target state and measurement variables in the Dynamic Bayesian network model. The representation allows one to model different self-...
This paper deals with a possibility of applying multiple model change detection for crack detection in a beam. The beam is considered here to be a single-span uniform Euler-Bernoulli beam with rectangular cross-section and simply supported ends. The crack is assumed to be fully open single-sided transverse crack with a fixed depth. By rewriting general linear models of beams with different positions...
Considerable attention has focused on the problem of cyber-attacks on cyber-physical systems in recent years. In this paper, we consider a class of single-input single-output systems which are described by a controlled auto-regressive moving average (CARMA) model. A PID controller is designed to make the system output track the reference signal. Then the state-space model of the controlled plant and...
Magnetic anomaly detection (MAD) refers to a passive method used to reveal hidden magnetic masses and is most commonly based on a dipolar target model. This paper proposes a generalization of the MAD through a multipolar model that provides a more precise description of the anomaly and serves a twofold objective: to improve the detection performance, and to widen the variety of detectable targets...
The Visible-Infrared Imaging Radiometer Suite (VIIRS) on-board the Suomi National Polar-orbiting Partnership (SNPP) spacecraft as a primary sensor was launched October 28, 2011. It has 22 bands: 7 thermal emissive bands (TEBs), 14 reflective solar bands (RSBs) and a Day Night Band (DNB). The TEBs are calibrated on-orbit using the On-Board Calibrator BlackBody (OBCBB) as a thermal source every scan...
A distributed reinforcement strategy for controlling the traffic lights in an urban area is proposed to minimize the average waiting time of the vehicles in the network. The network is assumed to follow the dynamics of the cell transmission model (CTM). Unlike many other CTM-based approaches, the proposed strategy only uses those cell occupancies that are observable from the flow measurements. A sufficient...
The paper presents a method for reconstructing the impulse hemodynamic response (HR) of functional near-infrared spectroscopy (fNIRS) data measured in the motor cortex of a human brain. The empirical impulse HRs are averaged across the most active channels of nineteen healthy volunteers. The impulse HR is modeled by a state space equation in which the optimal order of this model is computed by using...
The micro-motion characteristics of warheads have been utilized to discriminate false warheads from true ones. To obtain accurate dimensional measurements, a multiple-input multiple-output (MIMO) radar is adopted to observe the kinetic information of the warhead. A distributed state space model (SSM) is built and the differences between the true and false warheads are characterized as different system...
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