نتایج جستجو برای: signal

تعداد نتایج: 418371  

Aydin Nabovati, Hooman Nabovati, Hosseyn Keshmir, Khalil Mafinezhad,

This paper presents a comprehensive case study on electro-mechanical analysis of MEMS[1] variable capacitors. Using the fundamental mechanical and electrical equations, static and dynamic behaviors of the device are studied. The analysis is done for three different modes, namely: dc (static mode), small signal ac and large signal regime. A complete set of equations defining dynamic behavior of ...

A. Hakimi, S. Mohammadi, S. Talebi,

In this paper we introduce two innovative image and video watermarking algorithms. The paper’s main emphasis is on the use of chaotic maps to boost the algorithms’ security and resistance against attacks. By encrypting the watermark information in a one dimensional chaotic map, we make the extraction of watermark for potential attackers very hard. In another approach, we select embedding po...

Sampling rate conversion (SRC) is one of important issues in modern sampling theory. It can be realized by up-sampling, filtering, and down-sampling operations, which need large complexity. Although some efficient algorithms have been presented to do the sampling rate conversion, they all need to compute the N-point original signal to obtain the up-sampling or the down-sampling signal in the tim...

Journal: :iranian journal of medical physics 0
seyed ali shafiei assistant professor of medical physics, school of medicine, qom university of medical sciences, qom, iran

introduction many features, emerging from mathematical techniques, have been used in the analysis of brain signals. in this study, the physical quantity of “moment of inertia” (moi) was introduced as a feature to enhance high-frequency waves (hfws) in electroencephalography (eeg). materials and methods in this research, the recorded eegs from f3, f4, and cz points in 20 males were used. a total...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2006
alireza zomorrodi bahram nasernejad jahanshah kabudian

the biologists now face with the masses of high dimensional datasets generated from various high-throughput technologies, which are outputs of complex inter-connected biological networks at different levels driven by a number of hidden regulatory signals. so far, many computational and statistical methods such as pca and ica have been employed for computing low-dimensional or hidden representat...

Journal: :iranian journal of science and technology transactions of electrical engineering 2015
m. a. bagherzadeh j. ghaisari j. askari

in this paper, sufficient conditions are proposed to investigate the robust stability of arbitrary switched linear systems with uncertain parameters belongs to the known intervals. in addition, a method is then established to determine the maximum intervals of parameters' variations which guarantee robust exponential stability of uncertain switched linear systems under arbitrary switching. in t...

Journal: :iranian journal of electrical and electronic engineering 0
خدابنده لو khodabandehloo میرزاکوچکی mirzakuchaki کریمی karimi

the mixed-signal circuits with both analog and digital blocks on a single chip have wide applications in communication and rf circuits. integrating these two blocks can cause serious problems especially in applications requiring fast digital circuits and high performance analog blocks. fast switching in digital blocks generates a noise which can be introduced to analog circuits by the common su...

ژورنال: سلامت کار ایران 2006
صفار دزفولی, محسن, مسدد, سید هاشم, کلینی ممقانی, ناصر,

  Background and aims   Recordings of electrical activity in the muscle and surface electromyography (EMG) have been widely used in the field of applied physiology. In parallel to  recording of the EMG, the detectable low-frequency vibration signal generated by the skeletal  muscle has been known and well documented. As the nature of the signal has been progressively   revealed, the term of mec...

Automatic classification of power quality disturbances is the foundation to deal with power quality problem. From the traditional point of view, the identification process of power quality disturbances should be divided into three independent stages: signal analysis, feature selection and classification. However, there are some inherent defects in signal analysis and the procedure of manual fe...

شاره, حسین , عاطف‌وحید, محمدکاظم , غرایی, بنفشه ,

Objectives: This study was conducted to compare the efficacy of metacognitive therapy (MCT), fluvoxamine and the combination of MCT with fluvoxamine, in improving thought control strategies and stop signal criteria in patients with obsessive-compulsive disorder (OCD). Method: Twenty one individuals among outpatients with OCD presenting to clinics in Tehran were selected and randomly divided int...

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