Bilal Abdelhalim Ghazal

Assistant professor
Computer Science - Statistics department - Section IV - Zahle
Speciality: Computer Science
Specific Speciality: Traitment d'images
Interests: Chess Ping pong Coin Collection
Skills: Programming languages microcontrollers and system design control system

Teaching 9 Taught Courses
(2016-2017) I2234 - Introduction au traitement d'images

BS Computer Sciences

(2016-2017) I2234 - Introduction au traitement d'images

BS Computer Sciences

(2016-2017) M2207 - Analyse numérique et calcul formel

BS Mathematics

(2016-2017) M2207 - Analyse numérique et calcul formel

BS Mathematics

(2014-2015) Math 208 - Applied Mathematics II (Statistics & informatics)

BS Mathematics

(2014-2015) Math 208 - Applied Mathematics II (Statistics & informatics)

BS Mathematics

(2014-2015) Info 325 - Numerical Analysis

BS Computer Sciences

(2014-2015) Math 304 - Numerical Analysis I

BS Mathematics

(2014-2015) Info 306 - Language Theory

BS Computer Sciences

2005 - 2009: Ph. D

University of Claude Bernard, Lyon1, Lyon France


2003 - 2004: DEA

Lebanese University + AUF
Modeling, Simulation and Data Processing

very good

1997 - 2002: Engineering diploma in electrical and Electronic

Lebanese University - Faculty of Engineering
Communication and Computer Science


1997 - 2002: Maitrises

Lebanese University - Faculty of Sciences
General Physics

Conferences 11 participations
Publications 15 publications
Khaled Chahine and Bilal Ghazal Automatic Sorting of Solid Wastes Using Sensor Fusion International Journal of Engineering and Technology (IJET) 2018

Nowadays solid waste is generated at an unprecedented rate due to rapid urbanization and industrialization. In the developing countries, recycling of useful materials from solid waste such as wood, plastic, glass and metal is severely constrained by limited door-to-door collection and poor means of waste sorting. Indeed, recovery of useful materials still relies on manual sorting, which is highly risky and hazardous for health. This paper details the design and implementation of an automated solid waste sorting system. The developed system is equipped with a programmable logic controller, an inductive proximity sensor, a capacitive proximity sensor, and a photoelectric sensor. Multi-sensor data fusion is used so that each material results in a different combination of sensor outputs. Once a material is identified, the controller makes a stepper motor rotate a defined angle to collect the material in its bin. Testing results show that the system is successful in sorting the four different materials.

Bilal Ghazal, Maha Khachab, Christian Cachard, Denis Friboulet, and Chafic Mokbel Classification of Contrast Ultrasound Images: Improvement of the GMM using Gaussian Filter IEEE 2017

Contrast agent microbubbles play an important role in ultrasound images. These agents are small and safe, and are administered intravenously in the systemic circulation to enhance the vascular zone of interest. The backscattered signals issued from the agent area are not considerable enough to be differentiated from the backscattered signals derived from the surrounding tissues. Therefore, applying further image processing techniques is mandatory to improve the visualization of the contrast ultrasound images, to achieve a satisfactory classification, and even to quantify the agent concentration in the perfused zone. The nonlinear physical property of the agent results in a relatively high backscattered signal with respect to the tissue characterized by a quasi-linear response. In this paper, a Gaussian mixture model (GMM) is used to discriminate between the biological tissues and the contrast agent. The efficiency of the GMM classifier is obviously consolidated if the data distribution fits to Gaussian. Therefore, we propose to apply a Gaussian filter as a pre-processing phase that allows the non- Gaussian distribution to match slightly the Gaussian. Consequently, Gaussian filter lends positive impact on the quality of the image and improves the performance of the GMM classification of the contrast-ultrasound images.

Bilal Ghazal, Khaled Al-Khatib, and Khaled Chahine A Poultry Farming Control System Using a ZigBee-based Wireless Sensor Network Science & Engineering Research Support Society SERSC 2017

Agriculture and poultry are the backbone of any country’s economy. Indeed, there is a strong correlation between agricultural growth and economic prosperity. While poultry are raised for egg and meat production, farmers experience a huge financial loss because of inaccurate weather forecasts and ineffective methods employed in conventional farming. Therefore, new effective technological approaches are required to continuously improve the productivity, profitability, and sustainability of our major farming systems. A wireless sensor network (WSN) is proposed to monitor and measure many poultry environmental parameters such as temperature, humidity, air quality, and amount of light. The different sensors are disposed in particular positions in the farm in order to better reveal the realistic information. The collected farming data are sent by means of WSN via ZigBee transceivers to the main controller based on PIC microcontroller or PLC module. The main controller analyzes the various readings, compares them with the standard levels, evaluates the presented situations, considers the portfolio of foreseen cases, and finally gives the right instructions. In fact, the main microcontroller controls the corresponding equipment such as heater, cooler, fan and others according to the processed data. The proposed system design offers convenient directives for different facing scenarios and therefore enables all-weather real time control of the farming parameters and achieves a comfortable environment for the fowls.

B. Ghazal, K. ElKhatib, K. Chahine, and M. Kherfan Smart traffic lights control system The Society of Digital Information and Wireless Communications SDIWC 2016

Traffic light control systems are widely used to monitor and control the flow of automobiles through the junction of many roads. They aim to realize smooth motion of cars in the transportation routes. However, the synchronization of multiple traffic light systems at adjacent intersections is a complicated problem given the various parameters involved. Conventional systems do not handle variable flows approaching the junctions. In addition, the mutual interference between adjacent traffic light systems, the disparity of cars flow with time, the accidents, the passage of emergency vehicles, and the pedestrian crossing are not implemented in the existing traffic system. This leads to traffic jam and congestion. We propose a system based on PIC microcontroller that evaluates the traffic density using IR sensors and accomplishes dynamic timing slots with different levels. Moreover, a portable controller device is designed to solve the problem of emergency vehicles stuck in the overcrowded roads.


In examination timetabling we have to assign the exams of a given set of courses to time slots, such that conflict exams are assigned to different time slots. Many authors have presented different approaches for solving a myriad of variants of the examination timetabling problem. In this paper, we describe a new proposed model for solving examination timetabling problem, we start by giving some definition about the graph theory, maximal independent set and there terms that using in the our model, then we describe our new algorithm. Keywords: Scheduling, Timetabling, Examination Timetabling, Graph Coloring Heuristics, Maximal Independent Set. I. INTRODUCTION In this article, we develop a new algorithm for solving examination timetabling problem. We want to avoid as much as possible that students have two exams in adjacent period, in addition to minimize the whole period time. It follows from the outcome of the problem of minimizing the number of time slots that there is no solution possible in which no student has two exams per day. And minimize the number of day to achieve all exams. Hence, we treat it as a soft constraint, and we include the number of students with two exams in adjacent period in the objective function. In the below sections we provide some definition used in our model from graph theory, Maximal Independent Set, and Multicriteria Approach.

Mohammad Kherfa , Bilal Ghazal and Khaled Khatib Smart Predefined Map Car The Society of Digital Information and Wireless Communications (SDIWC) 2015

Driver-free car or self-driving car is an autonomous vehicle capable of replacing traditional cars for many reasons. Our research concerns cars that are trained to follow many predefined paths according to user demands. The self-driving car should recognize each trajectory such as when turning right or left or just moving forward either at constant speed or at various levels of steady speeds. To secure the system, many sensors are provided to prevent accidents, while XBee transceivers achieve remote control and assure soft communication. Our work constitutes a hardware realization of self-driving car that takes place in variety of applications. When the destination place is selected, the car moves from primary position through the predefined trajectory until it reaches the set destination under the monitoring of control room. Our self-driving car is equipped with an ultrasound sensor to alert it when a barrier (human or other cars) is far at a specific distance and to stop it. Moreover, it has a dual wireless communication system that ascertains path selection from distance and fulfills complete feedback of the car functions.

B. Ghazal, M. Kherfan, K. Chahine, and K. Elkhatib Multi Control Chandelier Operations Using XBee for Home Automation The Society of Digital Information and Wireless Communications SDIWC 2015

Home automation systems aim to control all home activities and functionalities. Control can be done through a remote control that sends command signals wirelessly by means of infrared radiation, Bluetooth connectivity, or any other RF technology as well as via internet or GSM communication. The controlled target devices usually include domestic appliances, security and safety systems, HVAC systems, home theater, lights, and many other home tasks. In this study, we design, program, and implement a light chandelier with multiple functionalities. The operational modalities comprise manual and remote on/off, different working timers, daylight, romance option, light dimming, party style, on/off luminosity turning, password keys, and motion detection. The chandelier remote control uses XBee transceivers that fulfill secure commands and prevent any interference between similar systems. The remote control realization is based on PIC 16F877A microcontroller and supported by an LCD to display notifications.

K. Elkhatib, B. Ghazal, and S. Abo chahine Wide-Band Slotted Flower PIFA Antenna for Multimedia Handhelds Terminals The Society of Digital Information and Wireless Communications SDIWC 2015

The rapid progress in wireless communication systems and handheld terminal devices has made the implementation of small multi-band antennas one of the main technical challenges. The number of wireless systems in which multimode mobile terminals are required to operate has been growing constantly in recent years. Nowadays handheld terminal phones use various cellular bands (GSM850/900/1800/1900 + 3G/4G/5G), wireless LAN, Bluetooth, Digital TV (DVB-H), FM radio, GPS, RFID, UWB, and WiMAX. The narrow bandwidth constitutes the major disadvantage of microstrip antennas in most practical applications. This study proposes a new wideband small size flower-shaped PIFA antenna. The PIFA design has newest flower structure and is supported by two or three shorting pins. The layer patch is slotted by Allah name in Arabic الله) ). A capacitive feeding of the antenna was done via 50 coaxial cable to achieve impedance matching. The simulation was done using the high frequency HFSS10 simulator for different scenarios. Simulated results on the return loss, the radiation pattern, and the gain are promising. The devised antenna could be implemented in many wireless communication standards such as PCS (1850 – 1990 MHz), UMTS (1920 – 2170 MHz), WLAN 802.11 b/g (2400 – 2484 MHz), WIMAX (2.5 - 2.69 GHz), and WIMAX (3.4 - 3.6 GHz).

K. Chahine, M. Arnaout, anf B. Ghazal Parameter Estimation of Scattering Components Using Matrix Pencil Based Support Vector Regression The Society of Digital Information and Wireless Communications SDIWC 2015

Time delay estimation is a fundamental signalprocessing problem encountered in numerous applications. The backscattered signals emanating from a source and arriving at a receiver are usually represented by a model called the undamped exponential model. This model is used for narrowband signals whose time delays are usually estimated using super-resolution algorithms. For wideband signals, however, a geometric-theoryof- diffraction (GTD) based model is usually used to incorporate the frequency dependency of individual backscattered signals. In the literature, this model is approximated to allow for the application of existing super-resolution algorithms at the expense of estimation accuracy. This paper proposes a new model-independent estimation method called Matrix Pencil Based Support Vector Regression to overcome the limitations of existing methods. Simulation results show that the proposed algorithm succeeds in accurately estimating the time delays and frequency dependency parameters of the GTD-based model.

S. Kadri, and B. Ghazal New Proposed Design to Solve Examination Timetable Problem International Conference on Engineering, Science, Business and Management 2015 (ICESBM 2015) 2015

In this thesis we describe a new proposed model for solving examination timetabling problem. We want to avoid as much as possible that students have two exams in adjacent period. It follows from the outcome of the problem of minimizing the number of time slots that there is no solution possible in which no student has two exams per day. And minimize the constraint, and we include the number of students with two Index Terms—theory. I. INTRODUCTION In recent years, scheduling research has had an increasing impact on practical problems, and a range of scheduling techniques have made their way into real world application A timetabling problem can be defined to be the problem of periods. Timetabling is a real life scheduling task. There can be Automated examination timetabling has been addressed by a wide variety of methodologies and techniques over the last ten years or so. Many of the methods in this broad range of approaches have been evaluated on a collection of benchmark instances provided at the University of Toronto in 1996. In this thesis we describe a new proposed model for solving examination timetabling problem. We want to avoid as much as possible that students have two exams in adjacent period. It number of time slots that there is no solution possible in which no student has two exams per day. And minimize the number of day to achieve all exams. Hence, we treat it as a soft constraint, and we include the number of students with two exams in adjacent period in the objective function. II. SCHEDULING One of the most frequent application areas of informatics is scheduling. Scheduling problems come in all shapes and sizes. Our work concentrates on reactive schedulers as opposed to information, the reactive scheduler is responsible of accommodating any requested changes that may affect either Scheduling is concerned with the optimal allocation of scarce resources to activities over time [1]. The practice of resource and developed a plan to share it without bloodshed. processor unit of computer that must process a sequence of [2]. and route prices to Maximize profit and many other examples of scheduling problem. For obvious practical importance, it has discussion this problem. We will concentrate on the area of Timetabling scheduling activity. Timetabling is a familiar and difficult groups of students, or classes. In the broadest sense, The University Course Timetabling Problem (UCTP) is a common problem that almost every university has to solve. The timetabling "problem consists in scheduling a sequence of lectures between teachers and students in a prefixed period of time (typically a week), satisfying a set of constraints of various types" [3]. There are also other timetabling problems described in the literature such as educational timetabling, nurse scheduling, sports timetabling, transportation timetabling, and the educational timetabling can classify as examination ICMTSET 2015 artment number of day to achieve all exams. Hence, we treat it as a soft exams in adjacent period in the objective function

B. Ghazal, and K. Elkhatib Smart Home Automation System for Elderly, and Handicapped People using XBee Science & Engineering research support Society 2015

Smart home automation system is increasingly used due to the wide manufacturer brands and various available technologies. From a social point of view, residents are admitted to smart homes for comfort, luxury, improving quality of live, and for providing security against intrusion and burglars. Secondly, home automation is achieved using a single controller, monitoring and the controlling many interconnected appliances such as lights, power plugs, HVAC system, humidity and temperature sensors, gas, smoke and fire detectors, audio, video and home theater as well as security and emergency systems. Smart homes are cheap, low-power, cost effective, efficient, and realize the automation of a variety of domestic appliances using user-friendly interface as remote control or any other handheld devices. Elderly, handicapped patients, and people with disabilities who have problems with locomotion difficulty can benefit from this smart home to totally operate, with high performance, all appliances and devices from anywhere in the house. When a resident is living alone, the ubiquitous access becomes very important and it is realized by using XBee transceivers that maintain RF wireless communication between the remote control and the master control panel board.

Ghazal, B. ; Elkhatib, K. ; Mohammed, O. Wireless speed-control car IEEE 2014

Many applications, that involve the use of constant and fast regulated speed motors for various loads, require the usage of Direct Current (DC) motors. DC motors are configured across a large range of powers and different levels of speed. The simple techniques for controlling them, such as pulse width modulation, and the high performance of the DC motors functioning will yield to an increasing growth of the applications number and their varieties in the future. On the other hand, wireless communication is widely adopted in communication and information interchange, particularly with the spread use of cell phones. This article presents a wireless DC motor speed-control system by using PIC 16F877A microcontroller. An electronic circuit is coupled to the motor to provide the control-speed signal serially from distant microcontroller. A control panel is designed as an interface for the user to select the appropriate speed. The used commands are sent wirelessly to the control circuit driver. The microcontroller of this circuit regulates the DC motor as required using the pulse width modulation technique. Our approach is achieved by implementing a hardware prototype system constituted of two DC motors of a toy car. Total control and performing regulation are observed.

B. Ghazal, M. Khachab, D. Friboulet, C. Mokbel, C. Cachard Improvement of the GMM-AR classification of multiframe contrast ultrasound images using gaussian filter Journal of Acoustic Society of America JASA 2008

Despite the use of contrast agents that enhance the visualization of vascular zones, the backscattered signals from the contrast agent and tissue are still close which prevents the direct wide ultrasonic use in diagnosis. Thus, it was necessary to implement image-processing techniques that enhance the contrast echo and have the capability of classification. We have applied a new approach based on the autoregressive model where an image of prediction errors is calculated in the first phase. Then, a Gaussian filter is applied in order to model well afterward both agent and tissue behaviors by a Gaussian mixture model. The Agent to Tissue Ratio (ATR)factor and Fisher criterion are adopted to compare the performance of this method with existing techniques as the harmonic and B mode techniques. The experiments conducted have shown the advantages of our proposed approach where an increasing of ATR and Fisher are recorded. In fact, our ATR attains 19.20 dB which represents a good improvement in comparison with B mode (9.50 dB) and Harmonic technique (12.13 dB). Whereas Fisher, the parameter of classification feasibility, it reaches 2.01 which matches an excellent amelioration with respect the mentioning techniques with 0.97 and 1.00 respectively.

Ghazal, B; Khachab, M. ; Cachard, C. ; Friboulet, D. ; Mokbel, C. Autoregressive application for vascular zones detection in the contrast echographic images. IEEE 2007

Contrast agents are used in ultrasound imaging to enhance blood region and thereby separate the perfused area and the surrounding tissues. But unfortunately the signals backscattered from agent and tissues are still close. So it is necessary to implement signal processing to enhance the contrast echo. In this article, we apply the autoregressive model to exploit the nonlinear behavior agent properties. Then, we process the obtained pictures by a classification method followed by erosion dilatation algorithm to obtain a satisfying differentiation of the ultrasound image into two classes. The Agent to Tissue Ratio (ATR) factor is used to compare the performance of the methods, and the Fisher criterion is used to study the classification feasibility.

Ghazal B, Khachab M, Cachard C, Friboulet D, Mokbel C. Classification of contrast ultrasound images using autoregressive model coupled to Gaussian mixture model Pubmed 2007

Contrast ultrasound images are not clear enough to be directly adopted in the diagnostic. In fact, the ultrasound agents enhance the vascular zones but unfortunately the signals backscattered from agent and tissues are still close. Therefore, it is necessary to implement image-processing techniques to enhance the contrast echo and thus have the capability of classification. In this article, we apply a new approach based on the autoregressive model coupled to the Gaussian mixture model to represent both agent and tissue behaviors. Then, we process the resultant image by a classification method based on a fixed window's size in order to obtain a satisfying differentiation of the ultrasound image into two classes. Finally, we adopt the Agent to Tissue Ratio (ATR) factor and the Fisher criterion to compare the performance of this method with existing techniques as harmonic and B mode.


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