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Speckle noise is a common problem found in several imaging applications, mainly in SAR and ultrasound imaging. Originally designed for RADAR and SONAR image denoising, the Kuan filter can be adapted for other applications by emulating its parameters. However, these parameters need to be calibrated for each image by applying the filter several times with the parameters modified upon each filter run,...
The critical applications of wireless sensor networks, the increased data faults and their impact on decision making reveal the importance of adopting online techniques for data fault detection and diagnosis. Keeping in mind the hardware limitations of sensors, this work focuses on complementary signal processing techniques (temporal, spatial correlation and self organizing map) in order to cover...
Definition of individual bite force (BF) has been widely used in dentistry domain. In this study, a vivo sensory setup is introduced to simulate and analyze dental implant stress, in order to check out implant quality. Two different proposed sensors are introduced. First is a simple mechanical sensor for hard BF measurements. The second is a kind of new material compound suitable for flexible tactile...
A mammography exam, called a mammogram, is an important examination aid that is designed to help human in the early detection and diagnosis of breast diseases especially in women. Image processing is using for detecting for objects in mammogram images. Edge detection; which is a method of determining the discontinuities in gray level images; is a very important initial step in Image processing. Many...
Entropy-based image thresholding has received considerable interest in recent years. It is an important concept in the area of image segmentation. The entropy-based approach was used to get the threshold of image from 80 ages; it is used to weight the amount of reserved information of image after segmentation. Our contribution in this paper, is to explain the idea of Shannon entropy and how he utilized...
Power factor measuring is an important issue in industrial environment to maintain an acceptable quality of the delivered power. This paper describes a novel and fast response power factor computation technique. It employs microcontroller and two phase-locked loop (PLL) circuits. Only one sample from two signals that formed from the source voltage and the load current are required to execute the power...
Social networks contain large amounts of posts of different data types (text, images, sounds and videos). Textual posts express authors' opinions (with or against) or feeling (love, hate, optimism, pessimism, or anger). Such opinions are important for commercial and governmental organization since they help checking public opinion about a product, policy or an object in general. In this paper we present...
Children with intellectual disabilities are very challenging to teach, and can learn best with the use of different methodologies that engage their senses, such as using images, sounds and clips. In this work, a new educational system that can generate multimedia based tutorials dynamically is proposed. This system comprises of several components; (1) using a Stemming algorithm for text processing,...
The purpose of this paper is to propose a framework for intra-enterprise competency modeling. A case study to illustrate the adopted concepts and developed framework is discussed. Based on the proposed framework, emphasis is placed on investigating the capability models in different departments of the enterprise with the goal of enhancing enterprise decision making process.
This paper presents a near field measurement system for the detection of all electromagnetic (EM) field components radiated by microwave devices. This characterization system based on the use of 4 semi-rigid coaxial probes (1 monopoly antenna, 1 differential dipole and 2 differential loops) and a controlled positioning system is power calibrated. It allows the localization of the radiation source...
This paper presents the design of a class-AB power amplifier suitable for envelope modulator of polar power amplifiers. Polar modulation is one of the most popular RF power amplifier efficiency enhancement techniques. Class-AB power amplifier is a main building block of hybrid switching envelope modulator which is known as linear and efficient envelope modulator architecture. Design of high DC gain,...
A new general and complete TLM 2-D curvilinear node has been developed in this paper. Also, the performance and the accuracy of this new node have been demonstrated confirmed in two particular curvilinear 2-D nodes: the cylindrical and the elliptic. In addition, we have shown that the use of “average's parameters values” in the algorithm gives accurate results and efficient simulation. This remark...
Nowadays, the major problem in Lebanese hospitals is the absence of accurate database systems that can provide the reception with a list of available beds or rooms in the hospital. Hence, the system we have realized aims to provide a new tool to check the availability of the beds based on hardware and software. Therefore, each bed is equipped of a sensor based network that can test whether this bed...
In order to make the algorithm of Transmission Line Matrix method more flexible for the electromagnetic analysis of general form and characteristic structures, a 3-D TLM curvilinear cell has been proposed. The full study of the performance of this cell requires analysis of the dispersion error. The analysis of this error carried out in this paper for the cylindrical TLM algorithm shows that it is...
The recognition of fractional order behavior when identifying physical systems is relatively new. One of these fields where the fractional order integration can show up is the thermal diffusive interfaces. In fact, for some special conditions, an integration of order 0.5 appears when identifying the system. So, the objective of this work, divided into two parts, is to study the presence and the effects...
Loading transmission lines by capacitors is an effective way of miniaturization. The general equation of the quality factor of loaded transmission line section is derived. A careful comparison is, then, carried out between loaded transmission lines and unloaded equivalent ones realized on low-cost substrate and on a good-quality substrate. Results show that the Q-factor of transmission lines can be...
Access control has been a great concern in this Information and Communication Technology (ICT) era. The need to control access to certain information and resources has been taken seriously by the ICT community. This paper believes that no single security method, algorithm, key or procedure is entirely secure. Hence, a combination of multiple security compliments is mandatory to provide a high level...
Numerical modeling is a powerful tool to analyze outdoor noise propagation. Specific numerical techniques are needed to simulate the behavior of acoustic waves in the external environment. Ray tracing technique and beam tracing technique represent effective numerical methods, which are used in current simulation software. Several attenuation terms are to be considered during propagation, and their...
In this contribution, a Si-LDMOS transistor is used to design a power amplifier (PA) in a broad frequency band covering a number of modern wireless communications systems. The design, implementation, and experimental results of 4 W wideband Si-LDMOS PA are presented. A method based on source/load--pull characterization has been used to extract optimum source and load impedances over the desired bandwidth...
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