Now showing items 1-20 of 30

  • A comparison study on meta-heuristics for ground station scheduling problem 

    Xhafa Xhafa, Fatos; Herrero, Xavier; Barolli, Admir; Takizawa, Makoto (Institute of Electrical and Electronics Engineers (IEEE), 2014)
    Conference report
    Open Access
    In ground station scheduling problem the aim is to compute an optimal planning of communications between Spacecrafts (SCs) and operations teams of Ground Stations (GSs). While such allocation of tasks to ground stations ...
  • A fuzzy-based cluster-head selection system for WSNs: a comparison study for static and mobile sensors 

    Barolli, Leonard; Wang, Qi; Kulla, Ellis; Xhafa Xhafa, Fatos; Kamo, Bexhet; Takizawa, Makoto (IEEE Press. Institute of Electrical and Electronics Engineers, 2012)
    Conference report
    Restricted access - publisher's policy
  • A fuzzy-based trustworthiness system for P2P communications in JXTA-overlay considering positive and negative effects 

    Umezaki, Kouhei; Spaho, Evjola; Barolli, Leonard; Ikeda, Makoto; Xhafa Xhafa, Fatos; Takizawa, Makoto (2013)
    Conference report
    Restricted access - publisher's policy
    In Peer-to-Peer (P2P) networks, peers often interact with unknown peers and finding a reliable peer for interaction is a major challenge. In our previous work, we proposed and implemented a fuzzy-based trustworthiness ...
  • An intelligent handoff system for wireless cellular networks using fuzzy logic and random walk model 

    Barolli, Leonard; Xhafa Xhafa, Fatos; Durresi, Arjan; Koyama, Akio; Takizawa, Makoto (Institute of Electrical and Electronics Engineers (IEEE), 2008)
    Conference report
    Open Access
    In mobile cellular systems the handover is a very important process to maintain the desired Quality of Service (QoS). Many handover algorithms are proposed in the literature. However, to make a better handover and keep the ...
  • A Tabu Search algorithm for ground station scheduling problem 

    Xhafa Xhafa, Fatos; Herrero Garcia, Xavier; Barolli, Admir; Takizawa, Makoto (2014)
    Conference report
    Open Access
    Mission planning plays an important role in satellite control systems. Satellites are not autonomously operated in many cases but are controlled by tele-commands transmitted from ground stations. Therefore, mission scheduling ...
  • A web interface for satellite scheduling problems 

    Xhafa Xhafa, Fatos; Garcia, Carlos; Barolli, Admir; Takizawa, Makoto (Institute of Electrical and Electronics Engineers (IEEE), 2016)
    Conference report
    Open Access
    Mission planning plays an important role in satellite control systems, especially with increase of number of satellites and more complex missions to be planned. In a general setting, the satellite mission scheduling consists ...
  • Design and implementation of a JXTA-Overlay P2P system and smart box environment 

    Matsuo, Keita; Barolli, Leonard; Xhafa Xhafa, Fatos; Koyama, Akio; Durresi, Arjan; Takizawa, Makoto (Institute of Electrical and Electronics Engineers (IEEE), 2008)
    Conference report
    Open Access
    In this paper, we present the design and implementation of the JXTA-based e-Learning P2P system. We also show the design and implementation of a smart box environment that will be used for stimulating the learners to ...
  • Energy-aware analysis of synchronizing a groupware calendar 

    Xhafa Xhafa, Fatos; Palou, Daniel; Barolli, Leonard; Takizawa, Makoto (Institute of Electrical and Electronics Engineers (IEEE), 2016)
    Conference report
    Open Access
    With the fast development in Internet and Mobile technologies, we are witnessing a proliferation of applications that support online collaborative group work. Such applications offer many advantages as compared to traditional ...
  • Evaluation of struggle strategy in genetic algorithms for ground stations scheduling problem 

    Xhafa Xhafa, Fatos; Herrero, Xavier; Barolli, Admir; Barolli, Leonard; Takizawa, Makoto (2012-02-12)
    Article
    Open Access
    Ground station scheduling problem arises in spacecraft operations and aims to allocate ground stations to spacecraft to make possible the communication between operations teams and spacecraft systems. The problem belongs ...
  • Hybrid algorithms for independent batch scheduling in grids 

    Xhafa Xhafa, Fatos; Kolodziej, Joanna; Barolli, Leonard; Kolici, Vladi; Miho, Rozeta; Takizawa, Makoto (2012)
    Article
    Open Access
    Grid computing has emerged as a wide area distributed paradigm for solving large-scale problems in science, engineering, etc. and is known as the family of eScience grid-enabled applications. Computing planning of incoming ...
  • Impact of population size and number of generations on the performance of dense WMNs 

    Barolli, Admir; Oda, Tetsuya; Spaho, Evjola; Barolli, Leonard; Xhafa Xhafa, Fatos; Takizawa, Makoto (Institute of Electrical and Electronics Engineers (IEEE), 2012)
    Conference report
    Restricted access - publisher's policy
  • Implementation and design of new functions for a web-based E-Learning system to stimulate learners motivation 

    Matsuo, Keita; Barolli, Leonard; Xhafa Xhafa, Fatos; Koyama, Akio; Durresi, Arjan; Takizawa, Makoto (Institute of Electrical and Electronics Engineers (IEEE), 2008)
    Conference report
    Open Access
    Due to the opportunities provided by the Internet, people are taking advantage of e-learning courses and during the last few years enormous research efforts have been dedicated to the development of e-learning systems. So ...
  • Interface and results visualization of WMN-GA simulation system: evaluation for exponential and Weibull distributions considering different transmission rates 

    Barolli, Admir; Loia, Vincenzo; Oda, Tetsuya; Barolli, Leonard; Xhafa Xhafa, Fatos; Takizawa, Makoto (Elsevier, 2016-02-01)
    Article
    Open Access
    In this paper, we present the interface and data visualization of a simulation system for Wireless Mesh Networks (WMNs), which is based on Genetic Algorithms (GAs). We call this system WMN-GA. As evaluation parameters, we ...
  • Mission operations scheduling: complexity and resolution methods 

    Xhafa Xhafa, Fatos; Sun, Junzi; Barolli, Admir; Takizawa, Makoto (2012)
    Conference report
    Restricted access - publisher's policy
    Recently there has been a growing interest in mission operations scheduling problem. The problem, in a variety of formulations, arises in management of satellite/space missions requiring efficient allocation of user requests ...
  • Mobility effects of wireless multi-hop networks in indoor scenarios 

    Ikeda, Makoto; Hiyama, Masahiro; Barolli, Leonard; Xhafa Xhafa, Fatos; Durresi, Arjan; Takizawa, Makoto (Institute of Electrical and Electronics Engineers (IEEE), 2010)
    Conference report
    Open Access
    A Mobile Ad hoc Network (MANET) is a collection of wireless mobile terminals that are able to dynamically form a temporary network without any aid from fixed infrastructure or centralized administration. In recent years, ...
  • Multimedia transmissions over a MANET testbed: problems and issues 

    Kulla, E.; Ikeda, Makoto; Oda, Tetsuya; Barolli, Leonard; Xhafa Xhafa, Fatos; Takizawa, Makoto (2012)
    Conference report
    Open Access
  • Performance analysis of a genetic algorithm based system for Wireless Mesh Networks considering Weibull distribution, DCF and EDCA 

    Barolli, Admir; Oda, Tetsuya; Shinko, Ilir; Barolli, Leonard; Xhafa Xhafa, Fatos; Takizawa, Makoto (Institute of Electrical and Electronics Engineers (IEEE), 2016)
    Conference report
    Open Access
    Wireless Mesh Networks (WMNs) are attracting a lot of attention from wireless network researchers. Node placement problems have been investigated for a long time in the optimization field due to numerous applications in ...
  • Performance analysis of DSR and DYMO routing protocols for VANETs 

    Spaho, Evjola; Ikeda, Makoto; Barolli, Leonard; Xhafa Xhafa, Fatos; Kolici, Vladi; Takizawa, Makoto (2012)
    Conference report
    Restricted access - publisher's policy
    Wireless networks are continuing to attract attention for their potential use in several fields such as ad-hoc networks, sensor networks, mesh networks, and vehicular networks. Vehicular Ad-hoc networks (VANETs) are expected ...
  • Performance analysis of WMNs by WMN-GA simulation system for different WMN architectures and TCP congestion-avoidance algorithms considering uniform distribution 

    Barolli, Admir; Oda, Tetsuya; Shinko, Ilir; Barolli, Leonard; Xhafa Xhafa, Fatos; Takizawa, Makoto (Institute of Electrical and Electronics Engineers (IEEE), 2016)
    Conference report
    Open Access
    In this paper, we evaluate the performance of two Wireless Mesh Networks (WMNs) architectures considering throughput, delay, jitter and fairness index metrics. For simulations, we used ns-3, Distributed Coordination Function ...
  • Performance evaluation and comparison of fuzzy-based intelligent CAC Systems for wireless cellular networks 

    Barolli, Leonard; Mino, Gjergji; Ikebata, Taku; Barolli, Admir; Xhafa Xhafa, Fatos; Takizawa, Makoto (Institute of Electrical and Electronics Engineers (IEEE), 2010)
    Conference report
    Open Access
    The mobile cellular systems are expected to support multiple services with guaranteed Quality of Service(QoS). But, the ability of wireless systems to accommodate expected growth of traffic load and broadband services is ...