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This paper presents a demo proposal of a standalone smartphone application that can automatically analyse the signal quality of PCG, as it is recorded on a low-cost smartphonebased digital stethoscope. Features, related to the inherent pattern of the autocorrelated signal envelope, have been used for classifying and discarding the noisy portions from a continuous PCG. Our application has been successfully...
Fault detection of nonlinear systems become more feasible when it is conducted over Takagi-Sugeno (TS) approximated fuzzy models. Proportional plus integral observer (PIO) and robust observer (RO) have already been developed for the estimation of the system states and actuator/sensor faults. In this paper, the algorithms are implemented for the detection of valve and level sensor faults of a two-tank...
Considering the imminent migration of services to the Ka- and Q-bands, a payload dedicated to propagation measurements in these bands has become available from the Alphasat satellite under the coordination of the European Space Agency. This has strongly motivated the formation of many measurement campaigns across Europe in an effort to enhance the scientific databases with new, more reliable propagation...
An overview of ASKAP phased array feed (PAF) development is presented. New analytical and experimental techniques devised for ASKAP are described. Dedicated engineering test facilities are shown to be invaluable for system verification. Experience gained from PAF manufacture is compared with forecasts, and the importance of routine engineering demonstrated.
A generally accepted noise model of a FET without gate leakage current requires the knowledge of the elements of an equivalent circuit and three temperatures: physical temperature Ta and equivalent temperatures, Tg of intrinsic gate resistance and Td of drain conductance. Experimental confirmations have been published for III-V FETs and HEMTs and also for MOSFETs. There is, however, still a disagreement...
This contribution aims at studying the input impedance of household appliances in the frequency range from 9 kHz to 500 kHz (FCC band). The method using the network analyzer is chosen as it provides a very good trade-off between required accuracy and ease of use. Some of the most common household appliances present in customer installations are characterized in terms of impedance in their respective...
The results of noise-resistant speech signal processing, with the use of linear adaptive filters. To enhance the filtration efficiency, the filtration is proposed to use a cascade signal. This approach improves the noise resistance of the signal. A comparative analysis of the performance of the developed algorithm with known methods of filtration. The effectiveness of the proposed filter is demonstrated...
Localization is a crucial part in robot navigation. The significance of this issue is to the extent that further achievements in terms of robot control is highly dependent on that. There are various methods addressing this subject, among which the extended Kalman filter is proved to be one of the most successful ones. In classic extended Kalman filter, covariance matrixes of process noise Q and measurement...
This paper examines a schema for graph-theoretic clustering using node-based resilience measures. Node-based resilience measures optimize an objective based on a critical set of nodes whose removal causes some severity of disconnection in the network. Beyond presenting a general framework for the usage of node based resilience measures for variations of clustering problems, we emphasize the unique...
Superpixel algorithm aims to semantically group neighboring pixels into a coherent region. It could significantly boost the performance of the subsequent vision processing task such as image segmentation. Recently, the work simple linear iterative clustering (SLIC) [1] has drawn huge attention for its state-of-the-art segmentation performance and high computational efficiency. However, the performance...
It is often needed to compress images with providing certain properties or quality. Wavelet based coders SPIHT and JPEG2000 easily produce a desired compression ratio but not quality especially if one deals with compressing images corrupted by noise for which specific behavior of quality metrics on compression ratio (CR) or bpp might be observed. In particular, optimal operation point (OOP) where...
The noise measurements were carried out in 700 MHz, 1800 MHz and 2500 MHz bands assigned recently for LTE in Korea. On 728∼748 MHz, the noise was 5∼7 dB higher than the others due to microphone. On 1850∼1860 MHz, 2620∼2640 MHz, and 2660∼2670 MHz, the noises were 6∼10 dB higher than the others. Since the leakage power from BTS being transmitted already in adjacent band was effected to a noise level...
This paper presents the development of multiparametric model predictive control strategies for the control of the hypnotic part of the depth of anaesthesia. Based on a detailed compartmental model featuring a pharmacokinetic and a pharmacodynamic part, two different control strategies are employed and tested comparatively with the nominal mp-MPC. The designed strategies: a simultaneous multiparametric...
As part of ONR's Integrated Topside (InTop) Program, in 2014 Northrop Grumman delivered a bi-static, active, electronic scanned array (AESA) system, capable of multifunction, simultaneous transmit and receive operation. The system is wide band, transmits high power and has high receive sensitivity. Further, there are simultaneous transmit and receive modes required, in which the transmit AESA radiates...
Chaotic detection is presented to deal with the problem that the weak electrical signals of a stator are difficult to measure when a motor is at a low speed. In practice, traditional chaotic method will take a long time, and it is not accurate enough, so cell mapping theory is introduced, and this approach is faster and more accurate compared with the traditional chaotic method.
Noise or uncertainty appear in many optimization processes when there is not a single measure of optimality or fitness but a random variable representing it. These kind of problems have been known for a long time, but there has been no investigation of the statistical distribution those random variables follow, assuming in most cases that it is distributed normally and, thus, it can be modelled via...
A noise immunity improvement for hybrid position observers for brushless dc motor drives is proposed. A finite state machine is used to detect Hall-effect sensor transitions to determine if these transitions are true transitions or the result of momentary glitches. This filter causes a delay in the detection of the Hall-effect sensors that is compensated in the proposed observer. The proposed observer...
This paper deals with prediction of compression ratio (CR) in lossy compression of noisy remote sensing images using techniques based on discrete cosine transform (DCT). Properties of noise assumed additive (in original data or after proper variance stabilizing transform) are taken into account by setting quantization step (QS) proportional to noise standard deviation. It is shown that simple statistics...
Periodic noise has a global impact in spatial domain and can only be removed using frequency domain analysis. In this paper, a novel frequency domain technique is proposed for the removal of semi-periodic and quasi-periodic noise for both gray scale images and color images. This method includes auto detection using local thresholding. Weighted Gaussian Notch Filter (WGNF) is used to suppress noisy...
In this paper we consider an important practical aspect of texture region detection in remote sensing images. One specific feature of our study is that we assume a processed image noisy with a priori known type and parameters of the noise. Another specific feature is that we try to detect textural regions for a wide variety of textures without having a priori knowledge of their properties. The considered...
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