Omer Saleh Mahmod Jomah
Permanent Lecturer
Qualification: Doctorate
Academic rank: Associate professor
Department of Electrical and Computer Engineering - School of Applied Sciences and Engineering
Publications
Medical Expert Systems in Ambulance Care
Journal ArticleDaily incidents significantly impact the workflow of ambulance and healthcare personnel, whose critical role involves providing immediate medical treatment and facilitating transportation to hospitals. This study presents the design of a medical expert system aimed at enhancing first-aid response in ambulances and educating users on fundamental first-aid principles. The proposed system integrates a comprehensive knowledge base that catalogs disease symptoms and corresponding treatments, functioning similarly to a medical professional's guidance. While the system relies on pre-programmed symptoms, it allows for the continuous addition of new symptoms and diseases, ensuring adaptability in emergencies. This expert system is particularly beneficial for novice healthcare providers, equipping them with reliable diagnostic support and improving patient outcomes during medical emergencies.
Musa Kh A Faneer, Omer Saleh Mahmod Jomah, (10-2024), African Journal of Advanced Pure and Applied Sciences: African Journal of Advanced Pure and Applied Sciences (AJAPAS), 4 (3), 210-217
Simulating Photovoltaic Emulator Systems for Renewable Energy Analysis
Conference paperThe article discusses exploring the Photovoltaic (PV) emulator for simulating photovoltaic systems for Renewable Energy Analysis (REA) focuses on creating and applying a PV emulator to simulate photovoltaic systems and concludes by emphasizing the value of precise simulation tools in comprehending and enhancing photovoltaic system performance. The first portion of the article emphasizes how renewable energy sources especially solar energy are becoming more and more important in tackling the world's energy problems. As a result, the pv output along with the voltage and current have been presented
Omer.S. M. Jomah, (07-2024), 2024 IEEE 4th International Maghreb Meeting of the Conference on Sciences and Techniques of Automatic Control and Computer Engineering (MI-STA): IEEE, 4-14
Assessing Random Power Flow for Vehicle-to-Grid Operation Based on Monte Carlo Simulation
Conference paperThis paper employs Monte Carlo Simulation (MCS) to assess how randomly power flow is distributed in Vehicle-to-Grid (V2G) operations. V2G technology facilitates a bidirectional flow of electricity by allowing Electric Vehicles (EVs) to feed excess power back into the grid in addition to drawing power from it. The researchers used Monte Carlo simulation as a computational technique that involves generating random samples to analyze the behaviour of a system, to assess the impact of random variations in power flow on V2G operations. They considered various factors such as EV charging and discharging patterns, grid conditions, and user behaviour to create a realistic simulation environment. The main objective function in this study wants to achieve is to reduce the dependency on the grid and develop a stochastic framework for the efficient management of microgrids with the presence of EVs. reduce cost. As a result, the analysis of the MCS shows the performance of the bidirectional operation, and the output power of the integrated sources is obtained.
Omer.S. M. Jomah, (07-2024), 2024 IEEE 4th International Maghreb Meeting of the Conference on Sciences and Techniques of Automatic Control and Computer Engineering (MI-STA): IEEE, 11-24
Towards Net Zero Energy Buildings for Sustainability
Journal ArticleNet Zero Energy (NZE) buildings play a crucial role in meeting the Sustainable Development Goals (SDG) and creating environmentally friendly residential areas. These buildings are designed to generate as much energy as they consume, resulting in a net balance of zero energy consumption from the grid. By integrating innovative technologies and sustainable design principles, NZE buildings minimize their carbon footprint and contribute to a more sustainable future. The acquired result has been presented and discussed. The concept of Net Zero Energy Buildings (NZEBs) has gained significant attention in recent years as a crucial strategy for achieving sustainability in the built environment. NZEBs are designed to produce as much energy as they consume, resulting in a net energy balance of zero over a specified period.
Omer.S. M. Jomah, (05-2024), Online AJAPAS: African Journal of Advanced Pure and Applied Sciences (AJAPAS), 3 (3), 228-234
A Naive Bayes Classifier for Fault Detection and Classification Using Dimension Reduction Technique
Conference paperAbstract—Fault detection and classification is critical to the reliability of modern control systems in different industries, where detecting and classifying faults in operational processes are very important things while failure to detect and classify them, may cause irreparable damage. In this paper, fault detection and classification approach is presented. The first step, multi stage recursive least squares parameter estimation approach for controlled autoregressive autoregressive moving average systems (CARARMA) is developed with a view to estimate the parameters of the system, additionally, improve the effectiveness of the computation. By means of multi stage approach, the (CARARMA) system is decomposed into three simple identification models, and the parameters of each simple model is identified one by one. These parameters estimated by this approach are referred to as features, and not all of them have the same useful data about the system. In order to select the valuable features and improve a classification accuracy, the Linear Discriminant Analysis (LDA) approach based on scattering matrices is applied for dimension reduction. The classification between these reduced classes is done based on the Naive Bayes classifier. Finally, the obtained results explain the performance of this proposed approach.
Musa Kh A Faneer, Nasar Aldian Ambark Mohamed Shashoa, Omer Saleh Mahmod Jomah, (05-2024), EEITE 2024: 2024 5TH INTERNATIONAL CONFERENCE IN ELECTRONIC ENGINEERING, INFORMATION TECHNOLOGY & EDUCATION, 1-5
Design of Wireless Communication Network for the Idref Automated Control System II; Advancing Connectivity in the City of Rujban
Journal ArticleThe quest for reliable water access has been a critical endeavor throughout history, and Rujban
City is no exception. Faced with the challenges of aging infrastructure and reliance on external
water sources, Rujban is turning towards technological innovation for solutions. This paper
outlines the design of the communication component within the Idref Automated Control System
2 (IACS II), a significant advancement in the automation of Rujban's water distribution system.
This system innovatively connects the city's central distributed tank to three distributed tanks via
a robust wireless communication network, while maintaining a wired connection to the Idref
collection tank, the main control station, and associated monitoring rooms and pumps. The system
employs microcontroller-based automation to manage water levels, control signals, and monitor
pump activity and potential leaks, with data displayed on an LCD screen. This approach is poised
to dramatically improve the efficiency and reliability of water distribution in Rujban City, marking
a key step forward in addressing its water supply challenges.
Omar S. Jomah, (04-2024), Academy journal for Basic and Applied Sciences (AJBAS): الأكاديمية الليبية, 1 (6), 9-23
Design of Wireless Communication Network for the Idref Automated Control System II; Advancing Connectivity in the City of Rujban
Journal ArticleThe quest for reliable water access has been a critical endeavor throughout history, and Rujban City is no exception. Faced with the challenges of aging infrastructure and reliance on external water sources, Rujban is turning towards technological innovation for solutions. This paper outlines the design of the communication component within the Idref Automated Control System 2 (IACS II), a significant advancement in the automation of Rujban's water distribution system. This system innovatively connects the city's central distributed tank to three distributed tanks via a robust wireless communication network, while maintaining a wired connection to the Idref collection tank, the main control station, and associated monitoring rooms and pumps. The system employs microcontroller-based automation to manage water levels, control signals, and monitor pump activity and potential leaks, with data displayed on an LCD screen. This approach is poised to dramatically improve the efficiency and reliability of water distribution in Rujban City, marking a key step forward in addressing its water supply challenges. Key Words: Wireless Network, Transmitter, Receiver, Control System, Water Pumping, Water Distribution, Smart Irrigation System.
Musa Kh A Faneer, Omer Saleh Mahmod Jomah, (04-2024), Academy journal for Basic and Applied Sciences (AJBAS): Libyan Academy, 1 (6), 1-13
Accuracy Comparison between F-RLS algorithm for CARAR systems and F-RLS algorithm for CARARMA systems
Journal ArticleIn this paper, the data filtering based recursive least squares algorithm for a CARAR systems, and data filtering based recursive least squares algorithm for a CARARMA systems are derived for comparison. These algorithms are based on the decomposition technique and in this technique, the main algorithm transform into two sub algorithms with smaller sizes. First, System identification model and another is the noise identification model. The problem here is the unknown variables in the information vectors and the used idea for solving this problem is to replacing these unknown variables with their corresponding estimates. Thus, the parameters of these two identification models can be estimated using recursive least squares method. Finally, a simulation example is provided to support the comparison between these proposed algorithms. KEYWORDS: identification algorithm; parameter estimation; filtering technique; decomposition technique; information vector.
Omer S. M. Jomah, (12-2023), Libyan Academy for Postgraduate Studies: Academic Journal of Science and Technology, 2 (1), 130-135
Understanding the Threat Posed by Chinese Cyber Warfare Units
Conference paperThe emergence of China as a global superpower has presented numerous challenges, among which is the growing threat posed by Chinese cyber warfare units. Operating under the People's Liberation Army (PLA), these units have been implicated in various high-profile cyber-attacks targeting both civilian and military entities worldwide. This paper endeavors to offer a comprehensive analysis of the risks presented by Chinese cyber warfare units, encompassing their organizational structure, tactics, and capabilities. By elucidating the nature and extent of this menace, we hope to enable governments and organizations to implement measures for better protection against Chinese cyber-attacks, as 80% of them target government bodies. In this study, we utilize the MITRE ATT&CK framework as a foundation to deliver an accessible, informative overview.
Omer Saleh Mahmod Jomah, (07-2023), 2023 IEEE 3rd International Maghreb Meeting of the Conference on Sciences and Techniques of Automatic Control and Computer Engineering (MI-STA): IEEE, 359-364
Comprehensive State-of-the-Art of Vehicle-To-Grid Technology
Conference paperA vehicle is a means of transportation, such as a car, truck, or train, that is capable of moving people or goods from one place to another. Vehicles can be classified based on various factors, such as the type of fuel they use (e.g. gasoline, diesel, electricity), the number of wheels they have (e.g. two, four, six), and their intended use (e.g. passenger transportation). Vehicles may have connectors, such as plug sockets or fuel ports, that allow them to be connected to other devices or systems to form Vehicle-to-Everything (V2X) technology. For example, an Electric Vehicle (EV) may have a charging port that allows it to be connected to an electric power source to recharge its batteries such Vehicle-to-Grid (V2G) as one of the V2X forms. One of the challenges in charging EVs is the availability of charging infrastructure. In many places, there are relatively few public charging stations, which can make it difficult for EV owners to find a place to charge their vehicles when they are away from home. Additionally, charging an electric vehicle can take significantly longer time than filling up a gasoline-powered vehicle, which can be inconvenient for some drivers. In this review, the various topologies of V2X, connectors, charging challenges, and EV impact types on the grid are conducted.
Omer Saleh Mahmod Jomah, (07-2023), 2023 IEEE 3rd International Maghreb Meeting of the Conference on Sciences and Techniques of Automatic Control and Computer Engineering (MI-STA): IEEE, 530-534
Stochastic Method and Sensitivity Analysis Assessments for Vehicle-to-Home Integration based on Renewable Energy Sources
Conference paperElectric Vehicles (EVs) as hotspot research are increasingly being used as alternative energy sources outside of transportation due to global variables like energy usage and environmental concerns. Gridable Electric Vehicle (GEV) is exploiting the opportunity for connecting EVs to the grid. EVs are now capable of contributing to addressing power limitations and acting as a reserve source of energy for the distribution grid in the Electric Vehicle Charging Facility (EVCF) to form Vehicle-to-Home (V2H). This paper is introduced to estimate impacts on the load for the uncertain behavior of EVs under domestic load after being sized using algorithms. Although, the integration of EVs provides an economical and environmental solution with a positive impact, however, it affects the power system when the uncertain number of EVs is provided as heavy duty. Sensitivity analysis has been considered in the study to investigate the expected changes in the system from the affected components.
Omer S. M. Jomah, (07-2023), 2023 IEEE 3rd International Maghreb Meeting of the Conference on Sciences and Techniques of Automatic Control and Computer Engineering (MI-STA): IEEE, 783-787
Feature Selection for Fault Diagnosis Using Principal Component Analysis
Conference paperThe application of feature selection to fault diagnosis is presented. First, Filtered data identification algorithm is derived for controlled autoregressive autoregressive (CARAR) system in order to estimate the system parameters. The Proposed technique offers a high computational efficiency. These estimated parameters are referred as features and these features are not all have the same informative value. Next, features selection is carried out using principal components analysis. Finally, the simulation results demonstrate the value of the suggested procedures.
Omer S. M. Jomah, Nasar Aldian A. Shashoa, (07-2023), صربيا: IEEE-58th International Scientific Conference on Information, Communication and Energy Systems and Technologies (IEEE, 3-13
Expert System to Improve and Develop Mathematic Teachers Skills
Conference paperThis work intends to improve the educational process through the development of teachers skills and raise the level of learning by reducing the problems and obstacles facing the teacher and providing many different learning methods. This is done through expert systems, which is one of the important fields of knowledge-based artificial intelligence, where the expert system acquires all the information acquired by the expert in the field of mathematics by transferring all his scientific experience and how the mathematics expert deals with it, so that the knowledge acquired by experts in the field of mathematics is collected. In order to prepare a knowledge base and deal with it through the expert system, as well as the possibility of making the expert system that the teacher deals with, ready to answer any inquiries or the possibility of explaining any part of the curriculum on demand.
Omer Saleh Mahmod Jomah, (06-2023), 2023 IEEE International Conference on Advanced Systems and Emergent Technologies (IC_ASET): IEEE, 51-75
المستودعات الرقمية بالكليات التقنية الليبية الواقع والمأمول
مقال في مجلة علميةالمستودعات الرقمية ذلك المصطلح الذي أصبح يتوغل في ثنايا المؤسسات
التعليمية العامة والخاصة الأكاديمية والتقنية. فالمستودعات الرقمية )ونخص بالذكر
هنا المستودعات الرقمية الأكاديمية( تعتبر من أنجع الوسائل المتبعة حالياً باستخدام
إمكانيات الأنترنت وتكنولوجيا المعلومات في حفظ كل ما يتعلق بالعملية التعليمية
من ناحية ونشر كل ما يتعلق بالعلوم والدراسات العلمية والأكاديمية بأقل التكاليف
ولأكبر شريحة من المهتمين من ناحية أخرى. ومن هنا جاء موضوع هذه الورقة لمعرفة
واقع المستودعات الرقمية بالكليات التقنية الليبية باعتبارها تمثل شريحة مهمة في
منظومة التعليم العالي بالدولة الليبية حيث تم اختيار كلية التقنية الإلكترونية ببني
وليد كدراسة حالة لكونها من أوائل الكليات التقنية والتي لها عراقة في تخريج العديد
من الدفعات على مدى حقبة زمنية تجاوزت الأربعين عاماً.
إذا تم لهذا الغرض تصميم استبيان )مرفق بالورقة( موجه لأعضاء هيئة التدريس
القارين بهذه الكلية واستخدامه لجمع بعض البيانات العلمية والأكاديمية الخاصة
بأعضاء هيئة التدريس ذات العلاقة بموضوع الاستبيان، والذي تم تقسيمه لمجموعة
من الأبعاد والتي تشمل بعض المعلومات الشخصية العلمية والوظيفية في الجزء الأول
منه، وفي الجزء الثاني يشتمل على مجموعة من الاستفسارات عن مدى معرفة المشارك
بالمستودعات الرقمية والصعوبات التي تواجهه عند التعامل مع هذه المستودعات،
وأخيراً مقدار تقبله وتأييده لتصميم وتنفيذ مستودع رقمي أكاديمي خاص بالكلية.
الكلمات الافتتاحية: المستودعات الرقمية، الكليات التقنية، كلية التقنية الإلكترونية،
Digital repositories are a term that has recently been echoing in the public and
private academic and technical institutions، as it uses information technology and
the internet to save everything that relates to the academic process. Also، Digital
repositories enable people to gain access to everything that relates to science and
research papers with very low cost. This paper will study reality of the digital repositories
in the Libyan technical institution. The College of Electronic Technology
– Bani Walid has been selected as a case study، as the college is ranked among the
top educational institutions for more than 40 years. For this purpose a survey has
been designed in which college staff members have been asked to fill it، and it was
used to collect some scientific and academic data for the college staff. The survey
was designed، as the first section contained data scientific and employment details.
And in the second section contained question، where the respondents were asked
how familiar they were with digital repositories and the challenges they face using
them. And lastly، in the third section، respondents were asked question to assess
their level of acceptance and support for designing and implementing a digital
repository system for the college.
Keywords: Digital Repositories، Technical Institutions، College of Electronic Technology،
College Staff Members.
عمر صالح محمود جمعة، (06-2022)، تونس: ISSN :0330 - 7042 المجلة العربية للمعلومات.، 33 (1)، 9-28
A comparison of Pattern Recognition Approaches for Recognizing Handwriting in Arabic Letters
Conference paperFor Arabic letters recognition, we achieve three of pattern recognition approaches namely gray level co-occurrence matrix (GLCM), local binary pattern recognition (LBP) and artificial neural network (ANN) and compare between them to result best performance. Two of these methods level co-occurrence matrix and local binary pattern recognition are used for feature extraction whereas in artificial neural network (ANN) we use the intensity values of pixels for input of the neural network. Two classifiers are used, the K-Nearest Neighbor classifier (KNN) for the LBP, GLCM and neural network classifier for (ANN) artificial neural network. Also, we evaluate the results by using leave one person out approach, fold classification and leave one out.
Jomah, O.S.M, (05-2021), online: 2021 IEEE 1st International Maghreb Meeting of the Conference on Sciences and Techniques of Automatic Control and Computer Engineering MI-STA, 818-824
Mechanization the traditional admission systems and their role in improving the quality of inputs for higher education institutions
مقال في مجلة علميةThis study aims to build a model for a unified electronic admission system for Libyan higher education institutions. It has been noticeable that tertiary institutions in Libya have poor outcomes, and perhaps one of the reasons for that is the presence of defects in the current admission systems and their policies, which leads to selecting and accepting inappropriate applicants. The admission systems in most Libyan higher education institutions are outdated and still based on paper applications.Hence, this research was conducted to look at the Arab experiences in employing technology to develop admission systems at higher educational institutions. The research was also conducted to determine whether those Arab experiences can be applied to our local tertiary institutions, and see if they can they improve the quality of higher education outcomes. The researchers critically reviewed a number of tertiary admission systems and procedures offered at some educational institutions in Arab countries to reach an appropriate proposal for an online admission system to use at higher education institutions in Libya. The target admission system aims to offer many advantages and benefits such as saving time and effort for students and workers, as well as speeding up the processes of admission applications and checking application statuses.
عمر صالح محمود جمعة، (03-2021)، سبها: مجلة جامعة سبها للعلوم البحثة و التطبيقية، 20 (3)، 28-35
Modeling and Control of Car Active Suspension System Using a Neural Network-based Controller and Linear Quadratic Regulator Controller
Conference paperThis paper aims to demonstrate the application of two different control techniques, namely the Linear Quadratic Regulator (LQR) and a neural network-based controller to evaluate and control the vibrations that occurred in the car's suspension system. When the car suspension is designed, a quarter car model with 1-DOF is used. A complete control system is needed to provide the desired suspension performance and characteristics such as passenger comfort, road handling, and suspension deflection, this control system performed by using the Matlab software and includes three parts: input signals (actuator force and road profile), Controller, and the suspension system model. The simulation results show a comparison between the uncontrolled suspension system and the suspension system with a neural network-based controller and the active suspension system of the car based on the linear-quadratic regulator, and it is explained thoroughly.
Omer.S. M. Jomah, (12-2020), online: IEEE, 1-6
Vehicle yaw rate control for lane change maneuver using fuzzy PID controller and neural network controller
Conference paperVehicle safety and control is attracting attention increasingly in an attempt to improve the stability and manoeuvrability of vehicles. Three degrees of freedom vehicle dynamic model (called planar vehicle model) is established. Based on theories of fuzzy PID control and neural network based-Controller, controller of vehicle stability is designed by using the method of direct yaw rate control and the two different control strategies. The controllers were compared under one road condition which is a lane change of manoeuvre. By comparing and analyzing the control effect of fuzzy PID control and neural network based-Controller, the result shows as follows: the two controllers improved the yaw rate to follow the reference yaw rate but, using the fuzzy PID controller gave a better and closer path for the desired path of yaw rate compared to using of the neural network controller.
Jomah, O.S.M, (12-2020), online: Institute of Electrical and Electronics Engineers Inc, 1-6
Micro Learning: A Modernized Education System
Journal ArticleLearning is an understanding of how the human brain is wired to learning rather than to an approach or a system. It is one of the best and most frequent approaches for the 21st century learners. Micro learning is more interesting due to its way of teaching and learning the content in a small, very specific burst. Here the learners decide what and when to learn. Content, time, curriculum, form, process, mediality, and learning type are the dimensions of micro learning. Our paper will discuss about micro learning and about the micro-content management system. The study will reflect the views of different users, and will analyze the collected data. Finally, it will be concluded with its pros and cons.
Omer Jomah, (03-2016), Volume 7, Issue 1, March 2016, ISSN 2067-3957 (online), ISSN 2068 - 0473 (print): BRAIN - Broad Research in Artificial Intelligence and Neuroscience, 7 (1), 103-110
A Novel Approach for Interactive Mobile Augmented Reality System
Conference paperMobile augmented reality is growing rapidly because of the growth of smartphones. Due to the portable
nature of smartphones, mobile augmented reality devices have become the most widely deployed consumer
augmented reality display device and show promise for becoming the first commercial success for augmented
reality technologies. The role of the user is identified and forwarded to the respective module. Cognitive
engagement and interactivity are the main two factors of influenced learning where the engagements are focused in
Learnability identification module. When a common, single optical tracking platform is available the reachability
and performance can also be increased without affecting the efficiency, which will be done in AllinoneAR Module.
An integrated framework consisting of three above stated modules is proposed in this paper
DR. OMER JOMAH, (11-2014), Florence, Italy: RECENT ADVANCES in ELECTRICAL and ELECTRONIC ENGINEERING, 313-316
Design and fabrication of an intelligent irrigation control system
Journal ArticleThis paper describes the design and fabrication of an intelligent Irrigation control system that allows intelligent control of the water applied to the field at right amounts and times. The system should have the capabilities to measure the water content in the soil so water can be applied as needed. The WATERMARK soil moisture sensor based on the measurement of the soil tension will provide the measurement of the water content. The system measures the soil tension, soil temperature and rain status and records the data in a file for future reference. It will apply water to field if a certain level of soil water tension is reached. This intelligent Irrigation control system is suitable for universities, research centers and farms where a control of the soil water content is required. The system can be used to study the water requirements for crops so irrigation can be scheduled efficiently.
O. S. Jomah, (07-2010), Stevens Point Wisconsin United States: World Scientific and Engineering Academy and Society (WSEAS), 0 (2), 370-375
Design and fabrication of an automatic window cleaning robot
Journal ArticleThe rapid growth of advanced robots has given researchers unprecedented opportunities to explore and discover new fields of research where robots can be used to assist humans in their daily life. There are many applications that use robots and automation in different aspects of life such as industry, medical, domestic machines and etc. In this paper, the work has been devoted for the use of robotics and robots in cleaning process. The window cleaning robot is one of the robots that have emerged in recent decay. This robot can be used in homes, offices and large buildings. The main target is to design a robot that can clean glass windows efficiently and rapidly even in dangerous and hazardous places. The robot will be controlled using the Programmable Logic Controller PLC. The motion will generated by three servo motors.
O. Jomah, (02-2010), Stevens Point Wisconsin United States: World Scientific and Engineering Academy and Society (WSEAS), 10 (1), 208-212
Adaptive Controller Design for DC Drive System Using Gradient Technique
Conference paperAdaptive control systems have been studied for many years. There are many types of adaptive control algorithms, one of which is the reference model technique. In this paper, the work has been devoted for the use of model reference adaptive control system (MRAC). The MRAC algorithm with parameters adaptation was developed and applied for control of the DC motor drive. The algorithm is based on the gradient technique with parameter adaptation. The controller can significantly improve system behavior and force the system to follow the reference model and minimize the error between the model and plant output.
O. Jomah, (09-2009), Transilvania University of Brasov, Romania: 2nd International Conference on Maritime and Naval Science and Engineering, 125-128
Design and Fabrication of an Intelligent Gate System
Conference paperThis paper describes the design and fabrication of an intelligent gate system that allows only certain vehicles or cars passing through the gate. It is very important to design an intelligent gate to control the flow of entered people or vehicles to the premises. The gate system should have capabilities to control the gate, where only specified vehicles or cars are allowed to enter the premises. The gate will open when the known vehicles are identified. The gate will not open if unauthorized vehicles try to pass. The system is a combination of mechanical, electrical and electronic components. It is one of the mechatronics engineering products. This intelligent gate system is suitable to be installed at universities, companies where only certain vehicles are allowed to enter. The list of certain vehicles must be stored in the database of the system. When the unknown vehicles try to pass through the gate, the gate will show a warning signal to the driver that they are unauthorized.
Omer. SM Jomah, (03-2009), Tunisia: 3rd International Congress Design and Modelling of Mechanical Systems, 1-6