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.
Evaluation of reliability is very important entity for the design and operation of systems. The safety, dependability, availability, Mean Time To Failure (MTTF), Mean Time Between Failure (MTBF), Mean Time To Repair (MTTR) and life cycle of the designed system can be judged from this reliability evaluation. For simple systems, the evaluation is straightforward. However, for complex systems, an algorithmic...
In this work, the 3D geometry of patient specific aorta was utilized to carry out CFD studies on the effect of different valve opening (45°,62.5° and fully opening) on the hemodynamic properties. The result shows that the lower valve opening induced jet flow and hampered the flow on the additional carotid arteries. Besides, the leaflets were subjected to extreme stress values having disastrous consequences...
This paper presents the implementation of four channel Electromyography (EMG) signal acquisition system for acquiring the EMG signal of the lower limb muscles during ankle joint movements. Furthermore, some post processing and statistical analysis for the recorded signal were presented. Four channels were implemented using instrumentation amplifier (INA114) for pre-amplification stage then the amplified...
Electromyography is one of the tools to measure fatigue indirectly. Widely research on electromyography and fatigue have been done include onset of fatigue and transition of fatigue during physical activity. The investigation not focusing on the muscle only, but other physiological indicator also involved to see the correlation. However, the information of electromyography behavior after activity...
Prosthesis hand is an artificial device which replaces missing hand because of human's hand may lost by trauma, disease or defect. From last decade, some researchers have been studying to invent and develop artificial hand. One of the most important step of bionic upper limb is developing surface electromyography (sEMG) signal analyzing methods. This pilot study is aimed to examine de-noising efficiency...
This study is to measure and investigate the muscle contraction during lifting tasks activities with the effect of different loads, height, angle of twisting and lifting frequency. This study involved 14 male and female participants performed the lifting tasks with different weight loads of 10kg to 24kg into the height position of 70cm and 130cm at the frequency of 1 and 6 lifts per minute with 0°...
ECG refers to non-invasive bioelectrical recording of the heart. Under the clinical settings, the ECG is interpreted by cardiologists via conventional inspection techniques. The methods however are exposed to visual error which leads to inaccurate diagnosis of the heart condition. Hence, as an attempt towards an automated diagnostic system, the paper elaborates on arrhythmia modelling based on ECG...
Each nerves and muscles of human body will generate potentials, voltages, and electrical field strength and known as bio signals such as electrocardiograph (ECG), electromyography (EMG), electroencephalogram (EEG), and electrooculogram (EOG). The signals may be acquired through non-invasive surface Ag/Ag Cl applications although the generated signals exist in very low levels of voltages. All the bio...
This paper presents the use of data acquisition (DAQ) device and LabVIEW program to evaluate and measure the pressure distribution for real-time robotic hand applications. An analog conditioning circuit has been implemented to calibrate and extract data from the utilized sensors to be processed by the DAQ and LabVIEW. Furthermore, an adequate signal processing analysis is performed on acquired data...
Modern wireless communication devices demands for multiband operation using single antenna to reduce complexity of the system. In this work a multi-band rectangular shaped Dielectric Resonator Antenna (DRA) is designed and analyzed. A two segments rectangular dielectric resonator with different permittivity's are stacked together, and a notch is created in the top segment of the resonator. By optimizing...
Fatigue detection through electromyography analysis has been in use since 1912 when it was discovered by H. Piper. Until now, there has been much research on muscle fatigue through electromyography, both invasively and non-invasively. There are evolutions of the electromyography based approach to detect fatigue in various aspects including methodology, analysis, application and the evaluation of fatigue...
In order to increase the network lifetime, scalable and energy-aware routing protocols are very essential for Wireless Sensor Networks (WSNs). In this paper, we propose a heterogeneity-aware Multi-hop Centralized Energy Efficient Clustering (MCEEC) protocol for routing in WSNs. Operation of MCEEC is based upon the advanced central control algorithm, in which Base Station (BS) is responsible for the...
The amount of internet traffic increases year by year. The bandwidth demands of internet consumers is ever increasing, although the costs at which improved services are offered does not scale at the same rate. The power consumption of components in the internet network is alarming and is an issue that urgently needs addressing as the technology which serves the internet is developed. Network providers...
Electromyography (EMG) is a signal which produces from motor units (MUs) in the muscles during contraction activities. By detecting EMG, it can show muscle contractions and body members' movement such as hand, eyes and legs. Monitoring and analyzing these signals from the skin which called Surface EMG (SEMG) required some essential components, for example electrode, data acquisition (DAQ) system and...
A 0.7 dB (min.) low noise figure PHEMT LNA at 5.8 GHz using an inductive drain feedback that is applicable to the WiMAX 802.16 standard. The amplifier uses FHX76LP superHEMT low noise FET. The Ansoft Designer was used during the design process. The low noise amplifier (LNA) produced the forward transfer gain (S21) of 43.74 dB. The return loss (S12), input reflection (S11) and output reflection (S22...
Overhead transmission line insulators are designed to perform dual functions namely electrical protection and mechanical support. However, irregular distribution of voltage and electric-field in the insulators may lead to corona, partial discharge, premature aging and indeed flashover. An attempt has been made with finite element software to calculate the voltage and electric-field distribution in...
Recording of biopotential signals is uneasy as interference and noise can come from the preparation of the subject, environment setting and other biological signal. The circuit design in acquisition system must good and meets specification as is not distort original signal and safe to patient. Classic design of biosignal acquisition system usually use third electrode as reference potential. The third...
Knee-FES-ergometer for knee swinging exercise is introduced as a hybrid exercise for restoration of function of the knee for stroke patients through the application of functional electrical stimulation (FES). The aim of the new knee-FES-ergometer is to provide high intensity knee swinging exercise. It is able to reduce required electrical stimulation and will able to elongate the exercise duration...
The main goal of compression is to reduce the amount of data required to represent a digital image. Conformal mapping has long been an important topic in complex analysis. In this paper, the proposed image compression technique based on conformal mapping transformation is introduced. The most recent standard compression technique, JPEG2000 compression algorithm, is used. The proposed technique is...
This paper investigates the influence of backreflection on the upstream signal in the 10 Gbps bidirectional WDM PON system running on a single fiber. High backreflection light may be produced by Rayleigh backscattering, Fresnel and Brillouin backscattering and ultimately causing poor bit error rate. However the utilization of SOA that provides gain helps to overcome the network losses and should be...
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.