The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper presents an anisotropy-based position estimation approach taking advantage of saturation effects in permanent magnet synchronous machines (PMSM). Due to magnetic anisotropies of the electrical machine, current responses to high-frequency voltage excitations contain rotor position information. Therefore, the rotor position can be estimated by means of these current responses. The relation...
Semiconductor manufacture companies make an effort to reduce the test time for the test cost reduction until mass production starts. One of the effective test time reduction techniques is to improve the parallel test efficiency with the test program optimization by debugging on the automatic test equipment (ATE). However, given the time constraints of production schedules, the available time for the...
A paper is devoted to the management of innovative projects based on the theory of fuzzy sets. To analyze project risks based on the terms of their implementation — acceleration, according to the plan and with the delay, authors proposed to employ both the asymmetry coefficient and the coefficient of asymmetry variation which are characterizing the asymmetric distribution of costs due to changes in...
In this paper, the minimum number of calibration loads sets and the degrees of freedom of T-parameter of a fixture for the indirect estimation of S-parameters of a device under test (DUT) are presented. Specifically, the case wherein the number of measurement ports (m) is greater than the number of ports of the DUT (n) is investigated. The T-parameters of the (m, n)-port fixture are obtained by connecting...
We have recently demonstrated the feasibility of vascular guided wave imaging (VGWI) in non-invasive estimation of bi-plane (i.e., longitudinal and transverse) transmural arterial Young's modulus (ELV, ETV) in tubular phantoms using phase velocity (cph) (Guo et al., ITEC 2016). In this study, we further compare the ETV estimated from the circumferential Lamb type (CLT) wave by VGWI with ETP from the...
This paper describes a position estimation approach based on high-frequency voltage injections for dual three-phase permanent magnet synchronous machines (DTP-PMSM) whose sets of windings are spatially shifted by 360 electrical degrees. Fail-operational drives gain more and more importance in automotive applications. Typically, multiphase machines are used to realize fail-operational properties. Besides...
The proliferation of Solar Home Systems (SHS) in recent times hopes to provide an alleviating solution to the global problem of energy poverty. Battery is usually the most expensive but important part of an SHS; it is also normally the first part to fail. Estimating the battery lifetime can help make informed system design choices, and it is therefore an important exercise for an SHS designer. Battery...
The Frisch-Waugh-Lovell (FWL) Recursive Least Squares (RLS) algorithm has been recently proposed as an RLS algorithm with lower computational cost and better numerical properties. We propose a VHDL implementation that has been successfully implemented on a Xilinx Virtex-7 FPGA. The FWL RLS algorithm has a complexity of L2 + O(L) products, instead of 1.5L2 O(L) as in conventional RLS algorithms. Because...
The estimation of Ultrasound-Contrast-Agent (UCA) kinetics from Dynamic Contrast-Enhanced Ultrasound (DCE-US) recordings has shown promise to localize prostatic malignancy. In a two-dimensional (2D) approach, UCA dispersion and velocity provide a characterization of the prostate (micro)vasculature with diagnostic value [1]. To this end, the UCA transport kinetics are modelled with strong assumptions...
Estimating short-term power load is a fundamental issue in the power distribution system. Since short-term power load is related to many parameters such as weather conditions, and time. The aim of this study is to determine the relevant parameters in estimating short-term power load not only in order to decrease the computational cost, but also to achieve higher success rates. Furthermore, by using...
The paper describes the development of a universal test functions generator to validate and setup the algorithms for investigating multiextremal systems characteristics. The main difference between the proposed functions and the set of known multiextremal test functions is their irregularity related to the extremes coordinate location and their respective quantitative values, since all known test...
In this paper, system identification is carried out for a 20 kWh battery using real-world measurements data. State-of-charge (SOC) and the open-circuit voltage (Voc) relationship will be obtained using least square estimation (LSE) non-linear regression. In addition, how to estimate SOC using current measurements and how to estimate the equivalent circuit's RC parameters are carried out using autoregressive...
The paper provides reasonable determination of the mapping rule and the sampling interval for human joint impedance estimation based on the observation from a variety of viewpoints. While a human joint can be modeled by a linear second-order continuous-time system, conventional parametric estimation methods such as the least squares method is carried out with the sampled input-output data, and thus,...
In the paper, the method of parametric identification of interval discrete dynamic models is considered. An improved scheme of the computational implementation of this method is proposed. The scheme considers an area of permissible values for modeled characteristics. Results of the comparative analysis of the proposed scheme efficiency of this method with a known one are presented.
The research presented here aims to improve the sensory economy of an all-accelerometer inertial measurement unit (IMU). The authors will show that accelerometers are underutilised in this class of IMUs when they are attached to dynamically constrained systems. This scenario usually warrants one of two solutions; each being geared towards general unconstrained motion. In this paper, however, the authors...
It was shown experimentally in [1], [2] that a macroscopic cylindrical solid can be rotated due to the excitation of two counter-propagating surface acoustic waves (SAWs) with different amplitudes on its surface. Arising internal distributed rotation force has been calculated phenomenologically in the partial case of a piezoelectric tube with a ring unidirectional electrode transducer (RUDT) using...
It has been known that cavitation is the primary mechanism to accelerate ultrasound induced thermal ablation and lesion formation. In order to increase the treatment efficiency, it is useful to know the size of existing cavitation bubbles so as to maximum the bubble oscillation using a frequency corresponds to the bubble resonant frequency at a lower acoustic pressure. In our previous work, a cavitation...
Affine-model-based optical flow method (OF) is a commonly used method for direct estimation of strain. Typically, two image frames are used to estimate the axial strain in OF (OF2). When the compression is relatively large (i.e., 3–5%), the performance of OF2 is deteriorated because of signal decorrelation. However, larger compression may lead to some new characteristics or increase the signal-to-noise...
This paper proposes a real-time identification method for auto-regressive with exogenous inputs and state-dependent parameters (ARX-SDP). This model is always non-linear. We conveniently adapt Young's off-line approach to an real-time approach with reduced computational cost. Young's approach focuses on discovering state-parameter dependence. This implies to unveil the nonlinear structure of the system...
The optimal filtering problem for non-stationary stochastic continuous-time observation models is considered. It is known that the problem solution can be found using both the Duncan-Mortensen-Zakai equation and the robust Duncan-Mortensen-Zakai equation. In this paper the special form of the robust Duncan-Mortensen-Zakai equation, where the drift, diffusion, and potential functions are expressed...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.