Jian Qiu Zhang, S.J. Ovaska · 2002
An adaptive window function for distorted power measurement is introduced in this paper. It can automatically provide the optimal window function according to the actual measured signal. Thus, the applied window function is always optimal due to the advantageous zeros of its frequency response corresponding to undesired spectrum components of the measured signal. As a result, the harmful truncation errors of asynchronous sampling and the influence of interharmonics in the measured signal spectrum can be totally eliminated. The correctness and applicability of the proposed method have been verified both theoretically and by extensive simulations.
Cited by 6
Bo Fernhall, Stamatis Agiovlasitis · Journal of Applied Physiology · 2008
Noninvasive measures of arterial function, such as intima-media thickness (IMT), endothelial function, and arterial stiffness are associated with and are prognostic of cardiovascular events in adults. Postmortem evidence, however, has established that the atherosclerotic process starts in childhood. Furthermore, cardiovascular morbidities in childhood disrupt arterial health and may lead to adverse outcomes in adulthood. Thus it is important to examine the developmental changes in IMT, endothelial function, and arterial stiffness in healthy youth in contrast to the arterial health profile of youth with cardiovascular morbidities and to examine the effect of lifestyle interventions. In healthy youth, IMT may increase slightly, arterial stiffness increases, but there is no change in endothelial function from 5 to 20 years of age. In youth with cardiovascular risk factors there are larger increases in IMT and arterial stiffness, and reductions in endothelial function compared with healthy youth. The reduced arterial function in youth with cardiovascular risk factors may be related to the atherosclerotic process. Exercise and physical activity appear to exert a protective effect on arterial function, and exercise training can improve arterial function in children with cardiovascular risk factors. Furthermore, although diet alone can improve arterial function in children, the combination of exercise and diet appears to be more effective than either intervention alone. Future studies need to focus on the mechanism by which exercise and diet improve arterial function, the most effective types of diet and exercise, and if intervening in childhood leads to favorable outcomes in adulthood.
Cited by 103
Avram Sidi · Journal of Computational and Applied Mathematics · 1976
Cited by 4
宮田龍太, Ryota Miyata, 佐藤 圭太 et al. · Tokyo Tech Research Repository (Tokyo Institute of Technology) · 2016
Cited by 0
Marcos V. Goycoolea, David C. Muchow, Patricia A. Schachern · The Laryngoscope · 1988
Current research and an overall review of 12 years of round window membrane studies is presented. The approach, rationale, and concepts that have evolved from the studies are described. An ultrastructural study of the round window membrane of rhesus monkeys disclosed three basic layers: an outer epithelium, a middle core of connective tissue, and an inner epithelium. Morphologic evidence in monkeys, cats, and chinchillas suggests that these layers of the round window participate in absorption and secretion of substances to and from the inner ear, and that the entire membrane could play a role in the defense system of the ear. Cationic ferritin, horseradish peroxidase, 1-micron latex spheres, and neomycin-gold spheres placed in the middle ear of these experimental animals were observed to traverse the round window membrane through pinocytotic vesicles. Three-micron latex spheres and anionic ferritin were not incorporated by the membrane. Cationic ferritin and 1-micron latex spheres placed in perilymph were incorporated by the inner epithelial cells, suggesting absorptive capabilities of the round window membrane. Cationic ferritin was observed within the mesothelial cells underlying the scala tympani side of the basilar membrane, suggesting a role for these cells in the inner-ear defense system. A review of the subject and a general perspective from the author's viewpoint are discussed.
Cited by 150
Yasuhiro Takahashi, Toshikazu Sekine, M. YOKOYAMA · IEICE Electronics Express · 2015
This paper proposes a memristor SPICE model using the Tukey window (or tapered cosine window) function. Compared with the previously proposed models based on the boundary function, the proposed model is resistant to numerical errors. From the SPICE result of a relaxation oscillator, we observe that the proposed model can be effectively used to minimise the effect of round-off errors.
Cited by 19Open access
Yunfeng Liu · 2012
Improved quality of life, more and more people learn playing the piano. However, the piano base frequency will change. Through the method of wavelet noise reduction, useful signal will be separated from noise. By window function, the estimation accuracy of peak estimation method improves and the peak of the signal more clearly show. Matlab simulation result shows it can achieve the goal of measuring piano frequency.
Cited by 1
Ananda YR · 2022
A new window function is proposed to enhance the nonlinearity for memristor model.<br>
Cited by 0Open access
Prasad Pramod Soman, Kirti Agashe, Nisha Sarwade et al. · 2015
Memristor being a fourth fundamental passive electrical circuit element in nanoscale technology has gained a great interest in the new era of semiconductor technology. The memristor with its special property of nonvolatility, low power consumption, small size and improved scalability has captured interest in many applications from digital logic circuits to neuromorphic computing. This paper will discuss and compare the most noteworthy models of voltage controlled memristor. We propose implementation of different window functions which can be implemented in the future voltage controlled memristor models to observe nonlinear hysteresis behaviour of memristor.
Cited by 0
Dan Li, Xiaofen Tan, Zhiguo Feng · 2018
The design of the broadband beamformer problem is to find the coefficients vector for all FIR filters such that output fits to a given target spatial directivity pattern in a specified domain. This problem is always very complicated. In this paper, a fast window function method is proposed to solve this problem. First, a simplified optimization problem is formulated, where the frequency response function is the decision function. Then an optimal frequency response vector can be obtained by solving this problem. Next the window function is applied to cut off the infinite length of the coefficient. The window function method is efficient and can be applied in real time applications. Numerical example is illustrated to show the efficiency of the method.
Cited by 1
Mubeen Zafar, Muhammad Naeem Awais, Muhammad Naeem Shehzad · Microelectronics Journal · 2022
Cited by 19
W. J. Chaplin, Y. Elsworth, G. R. Isaak et al. · Symposium - International Astronomical Union · 1998
BiSON currently consists of four fully- and two semi-automated observatories, dedicated to the round-the-clock collection of low-degree (low- l ) helioseismological data. A complete historical record of the network can be found in Chaplin et al . (1996). The annual duty cycles achieved by BiSON have improved steadily since our sixth site was commissioned in 1992. Over the period 1992 – 1996 inclusive, we have recorded annual duty cycles of: 54. 68. 78. 74 and 78 per cent respectively.
Cited by 0Open access
Saurabh Singh Rajput, Dr. S. S. Bhadauria · 2015
Abstract—Digital filter plays an important role in digital signal processing applications. Digital filter can also be applied in speech processing applications, such as speech filtering, speech enhancement, noise reduction and automatic speech recognition among others. In this paper Matlab program is used to implement a low-pass FIR filter using adjustable window function based on Hamming window. In some applications such as frequency spectral analysis of a signal, a small main lobe width of the window function in frequency domain is required for increasing the ability to distinguish two closely spaced frequency components without increasing the length of the filter. In this adjustable window function the width of main lobe and amplitude of the side lobe can be varied by changing the value of for a fixed length. The comparisons of low pass FIR filters for different values of are shown. Designed low-pass FIR filter is used in the speech filtering application. The filter is applied to a recorded speech signal to remove high- frequency components of the speech signal. Signal comparison in time and frequency domain between filtered speech and original speech shows that a high frequency component of the original speech signal successively eliminates by using this low pass filter.
Cited by 0
Ananda YR · 2022
A new window function is proposed to enhance the nonlinearity for memristor model.<br>
Cited by 0Open access
Stefan C. Materna, R. Andrew Cameron · Biological Bulletin · 2008
The emphasis on the sequencing of genomes seems to make this task an end in itself. However, genome sequences and the genes that are predicted from them are really an opportunity to examine the biological function of the organism constructed by that genome. This point is illustrated here by examples in which the newly annotated gene complement reveals surprises about the way Strongylocentrotus purpuratus, the purple sea urchin, goes about its business. The three topics considered here are the nature of the innate immune system; the unexpected complexity of sensory function implied by genes encoding sensory proteins; and the remarkable intricacy of the regulatory gene complement in embryogenesis.
Cited by 15
Meng Li, Fangqun Liao, Jieyi Xu et al. · 2025
Wideband oscillations represent an emerging stability issue in power systems with a high penetration of renewable energy sources. Rapid and accurate monitoring of oscillations is regarded as a critical foundation for effective early warning and protection. Discrete Fourier transform (DFT)-based frequency domain analysis methods are widely employed for the rapid detection of wideband oscillatory components. However, when the oscillatory components are close to the fundamental frequency or when multiple components with similar frequencies are present, existing DFT-based algorithms exhibit limited accuracy in extracting oscillatory components. Moreover, the robustness against noise interference of existing method remains to be improved. This paper proposes a wideband oscillatory component measurement method based on two-point window-function interpolation (TWI). The proposed approach significantly enhances the extraction accuracy of oscillatory components with closely spaced frequencies, particularly those near the fundamental frequency, and improves the algorithm's robustness against noise interference. The effectiveness of the method is validated through both simulation signals containing wideband components and recorded waveform data from a practical oscillation event.
Cited by 0
Mario Coutiño, Faruk Uysal, Laura Anitori · 2022 IEEE Radar Conference (RadarConf22) · 2022
This paper introduces a general framework for waveform-aware optimal window design for mismatch processing. First, the linear relationship between the window function and the output of the mismatch filter, for both frequency and time windowing and a particular waveform, is modeled. Making use of such a relation, typical window constraints are discussed and shown to be amenable for convex optimization. In addition, different convex costs are briefly introduced and an efficient convex optimization scheme is introduced. In addition, the control of the frequency roll-off of the designed window function is enforced by a simple regularization term. Numerical results illustrate the proposed optimal window design scheme and show the applicability of the framework for devising waveform-aware window functions.
Cited by 10
Miaofen Li, Youmin Liu, Shaodan Zhi et al. · Journal of Dynamics Monitoring and Diagnostics · 2021
In this paper, a novel time–frequency (TF) analysis method, called the short-time Fourier transform using odd symmetric window function (OSTFT), is proposed using odd symmetric window function to replace the conventional even window function of STFT. Different from conventional STFT acquiring the amplitude maximum at time and frequency centers, OSTFT acquires the minimum amplitude of 0. Hence, OSTFT can obtain a TF representation (TFR) with high TF resolution by utilizing the leaked energy rather than restraining it. It is worth to mention that the proposed OSTFT can vitiate the effect of window size we choose on the TFR obtained. Furthermore, it also has a good performance on signals with complex instantaneous frequencies (IFs), even crossing IFs. Because we just replace the conventional window function of STFT, the time-consuming of the proposed OSTFT is at the same level as the conventional STFT. The effectiveness of proposed OSTFT has been validated on two complex multi-component simulated numerical signals and a signal collected from the brown bat.
Cited by 41Open access
R. J. Bhansali · Biometrika · 1980
The concept of the inverse correlation function of a stationary process xt was first introduced by Cleveland (1972), who also introduced the autoregressive and the window methods for estimating this function. The asymptotic distribution of the estimates provided by these two methods is derived and their asymptotic covariance structure is shown to be in accordance with a remark of Parzen (1974). The results are extended to show that the two procedures suggested by Durbin (1959, 1961) for estimating the parameters of a moving average model are asymptotically efficient, relative to maximum likelihood in the Gaussian case.
Cited by 60
Marcos V. Goycoolea, Lars Lundman · Microscopy Research and Technique · 1997
The ultrastructure of the round window membrane of humans, monkeys, felines, and rodents discloses three basic layers: an outer epithelium, a middle core of connective tissue, and an inner epithelium. Interspecies variations are mainly in terms of thickness, being thinnest in rodents and thicker in humans. Morphologic evidence suggests that the layers of the round window participate in absorption and secretion of substances to and from the inner ear, and that the entire membrane could play a role in the defense system of the ear. Different substances, including antibiotics, local anesthetics, and tracers such as cationic ferritin, horseradish peroxidase, and 1 mu latex microspheres, are placed in the middle ear side traverse the membrane. Cationic ferritin and 1 micron microspheres placed in perilymph become incorporated by the inner epithelial cells of the membrane. Permeability is selective; factors include size, concentration, liposolubility, electrical charge, and thickness of the membrane. Passage of substances through the round window membrane is by different pathways, the nature of which is seemingly decided at the outer epithelium of the round window membrane.
Cited by 213