Hafidi Imad

Hafidi Imad
Ecole nationale science appliqués khouribga · Mathématique et informatique

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37
Publications
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101
Citations

Publications

Publications (37)
Preprint
Full-text available
In today's modern world, the usage of technology is unavoidable and the rapid advances in the Internet and communication fields have resulted to expand the Wireless Sensor Network (WSN) technology. A huge number of sensing devices collect and/or generate numerous sensory data throughout time for a wide range of fields and applications. However, WSN...
Chapter
Vehicle routing problems are subject to massive investigations in operations research. We address in this presentation a specific variant of the problem called in the literature vehicle routing problem with flexible time windows (VRPFlexTW), when the solution has to obey several other constraints, such as the consideration of travel, service, and w...
Chapter
This paper provides effective methodologies intended to improve the behaviour of the Adaptive Large Neighborhood Search algorithm (ALNS), when solving the vehicle routing problem with time windows. The main challenge is to obtain a reduced real-time solution without compromising the quality of the solution specially for large instances. In this con...
Article
Full-text available
Due to the technological advancements and smart deployment, Wireless Sensor Networks (WSNs) receive much attention in numerous real-time application fields. The stringent limitations of the battery of sensor devices and dubious wireless medium incur enormous challenges in the secure data collection and routing. Integration of compressive sensing an...
Article
Full-text available
Privacy protection in Wireless Sensor Networks (WSN) constitutes a big challenge for the adoption of WSNs in data sensitive applications like health monitoring or tracking and surveillance of borders. Privacy protection require additional controls and communications overloads, which impact the overall network lifetime. Research community has propos...
Chapter
Recently, we have experienced a growth and a technological revolution in all areas such as industry, e-commerce, economics and health. To get more out of this digital revolution, we based our studies on statistics and in-depth research that we have carried out in the field of health in general and mental health in particular. In this context we hav...
Article
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Entity matching (EM), which is, the task of identifying records that refer to the same entity, is a critical task when constructing data warehouses. This task is often very expensive at the running time because data must be compared in pairs. This problem becomes more important when dealing with large-scale data. We propose a new parallel algorithm...
Article
Full-text available
The presence of duplicate records is a major data quality concern in huge datasets. To detect duplicates, entity matching is used as an essential step of the data cleaning process to map records that refer to the same real-world entity. Most of proposed algorithms require labeled data in order to train a classifier. However, we cannot always obtain...
Article
Full-text available
The number of Wireless sensor network (WSN) deployments have been growing so exponentially over the recent years. Due to their small size and cost-effective, WSN are attracting many industries to use them in various applications. Environmental monitoring, security of buildings and precision agriculture are few example among several other fields. Ho...
Article
Full-text available
In this paper, we present an efficient heuristic for the vehicle routing problem with time windows (VRPTW), inspired by the Adaptive Large Neighborhood Search (ALNS) previously suggested by Røpke and Pisinger [21]. The proposed heuristic uses the Modified Choice function (MCF) of Drake [12] as an elegant selection mechanism to favor the most succes...
Chapter
Sustainable development consists of a set of goals (SDG) associated with a myriad of targets. The aim is to achieve those underlying goals between 2015 and 2030. Although none of the goals refers directly to information and communication technologies (ICT) that latter can accelerate the development of human being and bridge the digital gaps, so as...
Article
Hyper-heuristics are a subclass of high-level research methods that function in a low-level heuristic research space. Their aim objective is to improve the level of generality for solving combinatorial optimization problems using two main components: a methodology for the heuristic selection and a move acceptance criterion, to ensure intensificatio...
Article
Vehicle routing problems are widely available in real world application. In this paper, we tackle the resolution of a specific variant of the problem called in the literature vehicle routing problem with flexible time windows (VRPFlexTW), when the solution has to obey several other constraints, such as the consideration of travel, service, and wait...
Article
Entity Resolution is the task of mapping the records within a database to their corresponding entities. The entity resolution problem presents a lot of challenges because of the absence of complete information in records, variant distribution of records for different entities and sometimes overlaps between records of different entities. In this pap...
Article
Full-text available
The objective of this paper is to consider the vehicle routing problem with time windows under two uncertainties: service and travel times. We introduce new resolution approaches for the robust problem and an efficient parallel procedure for the generation of all possible scenarios. The best robust solution of each scenario can be achieved by using...
Chapter
Full-text available
One of the most principal fields of data mining is finding frequent itemsets. Frequent itemset mine algorithms become resource hungry fast as their search space explodes if we feed them with large datasets. This problem is even more obvious when we try to use them on Big Data. Even if a lot of experiences of trying to apply this kind of techniques...
Chapter
Wireless Sensor Network is an autonomous network where each node auto-discover its neighbors. All nodes participate to create the network map and routing tables. These tiny devices have limited power (generally a battery for the full sensor lifetime) and reduced computing resources and memory. WSN are deployed for many applications like environment...
Chapter
Full-text available
Frequent itemset mining is a fundamental element with respect to many data mining problems directed at finding interesting patterns in data. Recently the PrePost algorithm, a new algorithm for mining frequent itemsets based on the idea of N-lists, which in most cases outperforms other current state-of-the-art algorithms, has been presented. The per...
Article
Full-text available
With the blasting growth in data, uptake data mining techniques to mine association rules, and then find useful information hidden in large data has become ever more important. Several existing data mining techniques often through mining frequent itemsets draw association rules and get to relevant knowledge, but with the rapid arrival of the era of...
Conference Paper
Sensors are tiny devices with limited power (generally a battery for the full sensor lifetime) and reduced computing resources and memory. WSN are deployed for many applications like environment monitoring and health monitoring. In order to reduce the energy consumption and increase the WSN life, adapted network protocols like routing and data aggr...
Article
Frequent itemset mining is one of the data mining methodes implemeted to find frequent patterns, utilized in prediction, association rule mining, classification, etc. Apriori algorithm is an iterative method , that is used to discover frequent itemsets from transactional dataset. It scans entire dataset in every iteration to come up with the large...
Chapter
With the development of the Internet and cloud computing, there is the need of databases that will be able to store and process big data, and Not only SQL ’NoSQL’ databases are becoming increasingly used in the big data domains and have some interesting strengths such as scalability and flexibility. This paper explains the growing interest of imple...
Chapter
Full-text available
The growing use of smart phones, social networks and cloud computing has added a large amount of data. Studies predict that just under 4 trillion gigabytes of data will exist on earth. This has created a problem related to the processing of the data exchanged, which is rising exponentially and should be automatically treated. This paper presents a...
Article
Full-text available
The spectacular increasing of Data is due to the appearance of networks and smartphones. Amount 42% of world population using internet [1]; have created a problem related of the processing of the data exchanged, which is rising exponentially and that should be automatically treated. This paper presents a classical process of knowledge discovery dat...
Article
In this article we study the asymptotic behavior of the solution to the compressible Reynolds equation which describes the flow of fluid (air) on the hard disk as the distance between the read-write head and disk tends to zero. We apply these results to show the existence of equilibruim solutions for this system.
Article
We study a lubricated system consisting of two bodies in proximity. The flow of air is considered as a lubricated flow and the air pressure p satisfies the first-order slip Reynolds equation partial derivative/partial derivative t [ph] + Lambda.del[hp] = del . [(h(3)p + lambda h(2))del p], where h is the normalized gap thickness with can be discont...
Article
The existence of equilibrium solutions for a lubricated system consisting of an articulated body sliding over a flat plate is considered. Here we consider the case when cavity can occur.
Article
The existence of equilibrium solutions for a lubricated system consisting of an articulated body sliding over a flat plate is considered. Though this configuration is very common (it corresponds to the popular tilting-pad thrust bearings), the existence problem has only been addressed in extremely simplified cases, such as planar sliders of infinit...
Article
We study the asymptotic behavior of the solution of a Reynolds equation which describe the behavior of the fluid between two closes surfaces as the distance between the two surfaces locally tends to zero.
Article
Le travail traite de l'analyse dynamique d'un système mécanique constitué de deux surfaces rigides l'une est en mouvement par rapport à l'autre. La surface inférieur est plane animé d'une vitesse horizontal, la surface supérieure est mobile. L'espace entre les deux surfaces est rempli de fluide lubrifiant incompressible ou compressible dans le cont...

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