Soumissions récentes

  • Leveraging Learners' Activity Logs for Course Reading Analytics Using Session-Based Indicators 

    Sadallah, Madjid; Encelle, Benoît; Maredj, Azze-Eddine; Prié, Yannick
    In : (Inderscience, 2018)
    A challenge that course authors face when reviewing their contents is to detect how to improve their courses in order to meet the expectations of their learners. In this paper, we propose an analytical approach that exploits learners' logs of reading to provide authors with insightful data about the consumption of their ...
  • Memory-Efficient and Ultra-Fast Network Lookup and Forwarding Using Othello Hashing 

    Yu, Ye; Belazzougui, Djamal; Qian, Chen; Zhang, Qin
    In : (IEEE, 2018-04-11)
    Abstract: Network algorithms always prefer low memory cost and fast packet processing speed. Forwarding information base (FIB), as a typical network processing component, requires a scalable and memory-efficient algorithm to support fast lookups. In this paper, we present a new network algorithm, Othello hashing, and ...
  • Data Mining-Based Decomposition for Solving the MAXSAT Problem: Toward a New Approach 

    Djenouri, Youcef; Habbas, Zineb; Djenouri, Djamel
    In : (IEEE, 2017-06)
    A new approach decomposes a MAXSAT instance and then applies clustering via data mining decomposition techniques, with every cluster resulting from the decomposition separately solved to construct a partial solution. All partial solutions are then merged to build the global solution.
  • Optimal Placement of Relay Nodes Over Limited Positions in Wireless Sensor Networks 

    Bagaa, Miloud; Cheli, Ali; Djenouri, Djamel; Taleb, Tarik; Balasingham, Ilangko; Kansanen, Kimmo
    In : (IEEE, 2017-04)
    This paper tackles the challenge of optimally placing relay nodes (RNs) in wireless sensor networks given a limited set of positions. The proposed solution consists of: 1) the usage of a realistic physical layer model based on a Rayleigh blockfading channel; 2) the calculation of the signal-to-interferenceplus- noise ...
  • Energy-Aware Constrained Relay Node Deployment for Sustainable Wireless Sensor Networks 

    Djenouri, Djamel; Bagaa, Miloud
    In : (IEEE, 2017-03)
    This paper considers the problem of communication coverage for sustainable data forwarding in wireless sensor networks, where an energy-aware deployment model of relay nodes (RNs) is proposed. The model used in this paper considers constrained placement and is different from the existing one-tiered and two-tiered models. ...
  • A Framework for Space-Efficient String Kernels 

    Belazzougui, Djamal; Cunial, Fabio
    In : (Springer, 2017-02-17)
    String kernels are typically used to compare genome-scale sequences whose length makes alignment impractical, yet their computation is based on data structures that are either space-inefficient, or incur large slowdowns. We show that a number of exact kernels on pairs of strings of total length n, like the k-mer kernel, ...
  • A framework for space-efficient read clustering in metagenomic samples 

    Alanko, Jarno; Cunial, Fabio; Belazzougui, Djamal; Mäkinen, Veli
    In : (BioMed Central, 2017-03-14)
    Background: A metagenomic sample is a set of DNA fragments, randomly extracted from multiple cells in an environment, belonging to distinct, often unknown species. Unsupervised metagenomic clustering aims at partitioning a metagenomic sample into sets that approximate taxonomic units, without using reference genomes. ...
  • REFIACC: Reliable, efficient, fair and interference-aware congestion control protocol for wireless sensor networks 

    Kafi, Mohamed Amine; Ben-Othman, Jalel; Ouadjaout, Abdelraouf; Bagaa, Miloud
    In : (Elsevier, 2017)
    The recent wireless sensor network applications are resource greedy in terms of throughput and net- work reliability. However, the wireless shared medium leads to links interferences in addition to wireless losses due to the harsh environment. The effect of these two points translates on differences in links bandwidth ...
  • Efficient On-Demand Multi-Node Charging Techniques for Wireless Sensor Networks 

    Khelladi, Lyes; Djenouri, Djamel; Rossi, Michele; Badache, Nadjib
    In : (Elsevier, 2016-10-01)
    This paper deals with wireless charging in sensor networks and explores efficient policies to perform simultaneous multi-node power transfer through a mobile charger (MC).The proposed solution, called On-demand Multi-node Charging (OMC), features an original threshold-based tour launching (TTL) strategy, using request ...
  • Performance analysis and evaluation of REFIACC using queuing networks 

    Kafi, Mohamed Amine; Ben Othman, Jalel; Mokdad, Lynda; Badache, Nadjib
    In : (Elsevier, 2017-02)
    Wireless Sensor Networks (WSN) utilisation is characterised by its dense deployment in order to fulfil the monitoring tasks. This density of communication leads to interference and congestion. In a previous work, a schedule scheme dubbed REFIACC (Reliable, Efficient, Fair and Interference Aware Congestion Control), that ...
  • One-Step Approach for Two-Tiered Constrained Relay Node Placement in Wireless Sensor Networks 

    Cheli, Ali; Bagaa, Miloud; Djenouri, Djamel; Balasingham, Ilangko; Taleb, Tarik
    In : (IEEE Communications Society, 2016-06)
    We consider in this letter the problem of constrained relay node (RN) placement where sensor nodes must be connected to base stations by using a minimum number of RNs. The latter can only be deployed at a set of predefined locations, and the two-tiered topology is considered where only RNs are responsible for traffic ...
  • MAC Protocols with Wake-up Radio for Wireless Sensor Networks: A Review 

    Djiroun, Fatma Zohra; Djenouri, Djamel
    In : (IEEE Communications Society, 2016-10)
    The use of a low-power wake-up radio in wireless sensor networks is considered in this paper, where relevant medium access control solutions are studied. A variety of asynchronous wake-up MAC protocols have been proposed in the literature, which take advantage of integrating a second radio to the main one for waking it ...
  • Delay-efficient MAC protocol with traffic differentiation and run-time parameter adaptation for energy-constrained wireless sensor networks 

    Doudou, Messaoud; Djenouri, Djamel; M. Barcelo-Ordinas, Jose; Badache, Nadjib
    In : (Springer, 2016-02)
    This paper presents an asynchronous cascading wake-up MAC protocol for heterogeneous traffic gathering in low-power wireless sensor networks. It jointly considers energy/delay optimization and switches between two modes, according to the traffic type and delay requirements. The first mode is high duty cycle, where energy ...
  • Performance Optimization of Duty-Cycled MAC in Delay-Energy Constrained Sensor Network Under Uniform and Non-Uniform Traffic Generation 

    Doudou, Messaoud; M. Barcelo-Ordinas, Jose; Djenouri, Djamel; Badache, Nadjib; Garcia-Vidal, Jorge
    In : (interscience.wiley, 2016)
    Duty-Cycle at the MAC layer plays a key role in energy savings and network lifetime extension. It consists in putting a node’s radio in the sleep state as soon as it has no communication activity. Traditional WSN MAC protocols are designed with short duty cycles at the cost of long delays. Careful design is required for ...
  • Game Theory Framework for MAC Parameter Optimization in Energy-Delay Constrained Sensor Networks 

    Doudou, Messaoud; M. Barcelo-Ordinas, Jose; Djenouri, Djamel; Garcia-Vidal, Jorge; Bouabdallah, Abdelmadjid; Badache, Nadjib
    In : (ACM, 2016-05-15)
    Optimizing energy consumption and end-to-end (e2e) packet delay in energy-constrained, delay-sensitive wireless sensor networks is a conflicting multi-objective optimization problem. We investigate the problem from a game theory perspective, where the two optimization objectives are considered as game players. The cost ...
  • REFIACC: Reliable, Efficient, Fair and Interference-Aware Congestion Control Protocol for Wireless Sensor Networks 

    Kafi, Mohamed Amine; Ben Othman, Jalel; Ouadjaout, Abdelraouf; Bagaa, Miloud; Badache, Nadjib
    In : (Elsevier, 2016-05-28)
    The recent wireless sensor network applications are resource greedy in terms of throughput and network reliability. However, the wireless shared medium leads to links interferences in addition to wireless losses due to the harsh environment. The effect of these two points translates on differences in links bandwidth ...
  • CCS_WHMS: A Congestion Control Scheme for Wearable Health Management System 

    Kafi, Mohamed Amine; Ben Othman, Jalel; Bagaa, Miloud; Badache, Nadjib
    In : (Springer Link, 2015-10-21)
    Wearable computing is becoming a more and more attracting field in the last years thanks to the miniaturisation of electronic devices. Wearable healthcare monitoring systems (WHMS) as an important client of wearable computing technology has gained a lot. Indeed, the wearable sensors and their surrounding healthcare ...
  • Indexing and querying color sets of images 

    Belazzougui, Djamal; Kolpakov, Roman; Raffinot, Mathieu
    In : (Springer Varlag, 2016-09-27)
    We aim to study the set of color sets of continuous regions of an image given as a matrix of m rows over n ≥ m columns where each element in the matrix is an integer from [1,σ] named a color . The set of distinct colors in a region is called fingerprint. We aim to compute, index and query the fingerprints of all rectangular ...
  • Optimal Las Vegas reduction from one-way set reconciliation to error correction 

    Belazzougui, Djamal
    In : (Springer Varlag, 2016-03-28)
    Suppose we have two players A and C, where player A has a string s[0..u−1] and player C has a string t[0..u−1] and none of the two players knows the other's string. Assume that s and t are both over an integer alphabet [σ]=[0,σ−1], where the first string contains n non-zero entries. We would wish to answer the ...
  • Distributed Low-Latency Data Aggregation Scheduling in Wireless Sensor Networks 

    Bagaa, Miloud; Younis, Mohamed; Djenouri, Djamel; Derhab, Abdelouahid; Badache, Nadjib
    In : (ACM, 2015-04)
    This article considers the data aggregation scheduling problem, where a collision-free schedule is determined in a distributed way to route the aggregated data from all the sensor nodes to the base station within the least time duration. The algorithm proposed in this article (Distributed algorithm for Integrated tree ...

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