Now showing items 1-20 of 95

  • Multiple Benefits through Smart Home Energy Management Solutions—A Simulation-Based Case Study of a Single-Family-House in Algeria and Germany 

    Ringel, Marc; Laidi, Roufaida; Djenouri, Djamel
    In : (mdpi, 2019-04-23)
    From both global and local perspectives, there are strong reasons to promote energy efficiency. These reasons have prompted leaders in the European Union (EU) and countries of the Middle East and North Africa (MENA) to adopt policies to move their citizenry toward more efficient energy consumption. Energy efficiency ...
  • Machine Learning for Smart Building Applications: Review and Taxonomy 

    Djenouri, Djamel; Laidi, Roufaida; Djenouri, Youcef; Balasingham, Ilangko
    In : (ACM, 2019-03)
    The use of machine learning (ML) in smart building applications is reviewed in this paper. We split existing solutions into two main classes, occupant-centric vs. energy/devices centric. The first class groups solutions that use ML for aspects related to the occupants, including (1) occupancy estimation and identification, ...
  • Secure Inverted Index Based Search over Encrypted Cloud Data with User Access Rights Management 

    Boucenna, Fateh; Nouali, Omar; Kechid, Samir; Kechadi, M. Tahar
    In : (Springer, 2019-01-18)
    Cloud computing is a technology that provides users with a large storage space and an enormous computing power. However, the outsourced data are often sensitive and confidential, and hence must be encrypted before being outsourced. Consequently, classical search approaches have become obsolete and new approaches that are ...
  • Bidirectional Variable-Order de Bruijn Graphs 

    Belazzougui, Djamal; Gagie, Travis; Mäkinen, Veli; Previtali, Marco; Puglisi, Simon J.
    In : (World Scientific Publishing, 2018-12)
    Compressed suffix trees and bidirectional FM-indexes can store a set of strings and support queries that let us explore the set of substrings they contain, adding and deleting characters on both the left and right, but they can use much more space than a de Bruijn graph for the strings. Bowe et al.’s BWT-based de Bruijn ...
  • 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 ...

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