Vol.8 No.3 November 20, 2012

Fuzzy Techniques for Access and Data Management in Home Automation Environments (181-203)
        Mario Collotta, Vincenzo Conti, Giovanni Pau, Gianfranco Scatà,
        and Salvatore Vitabile
Home Automation Environments are characterized by the integration of electronic devices as well as by the performance of communication and control systems. Environment infrastructure has to meet several requirements including Quality of Service (QoS), safety, security, and energy saving. However, Home Automation deals with complex environments, so that advanced data management systems are required to meet the above constraints. Fuzzy Logic based techniques can be successful used to improve system performance management. This work proposes and describes the use and application of fuzzy rules on a two-tiered architecture integrating a biometric authentication module and communication real-time constraints. The goal is to combine the advantages of wired and wireless networks as well as the biometric recognition accuracy to increase the flexibility and the performance of the proposed deadline oriented architecture. The experimental results of the user authentication module, the energy consumption module and the scheduling module for real-time mobile communication are also outlined.

End-to-End single and multiple flows fairness in mobile ad-hoc networks (204-224)
        Makoto Ikeda
Wireless networks have become increasingly popular in recent years. They can provide mobile users with ubiquitous communication capability and information access regardless of locations. In this paper, we evaluate the heterogeneous environments of wireless mobile ad-hoc networks (MANETs) by simulations considering simulation runtime, memory usage, (average) throughput, percentage of received constant bit rate packets and congestion window. For simulations, we used ns-2 and ns-3 network simulators considering Ad hoc On-demand Distance Vector (AODV) and Optimized Link State Routing (OLSR) routing protocols. We evaluate the MANET performance considering random waypoint mobility models for different number of nodes, different area sizes and different maximum speed of mobility, by sending single and multiple flows in the network. The evaluation results show that OLSR had more disconnections than AODV and for large-size area, there is no fairness between flows. We found that TCP flow can have better connectivity than UDP flow in case of single flow data. While for dual flow, TCP performance is better in the beginning phases of transmission, because of the slow start mechanism.

ConDroid: Using an Android Phone as a 3D Input Device for a Multiuser 3D Drawing Application Setup in a Collaborative Virtual Environment over the Web (225-240)
        Danish Chopra and Drew Glass
3D collaborative virtual environments (CVE) are gaining popularity. One problem with 3D CVEs is lack of a natural 3D input device. Smartphones are gaining popularity for being used as a 3D input device for a variety of purposes. We present ConDroid, a system that uses a smartphone as a 3D input device in a 3D drawing application setup in collaborative virtual environment over the web with support for multiple users at the same time and on large or small displays. We tackle the problem of remote synchronization in CVEs using the concepts we have named as SUMD (synchronicity using minimal data) and remote semaphores with deadlock avoidance. For the CVE architecture, we use the basic idea of the Active replication model in which an atomic broadcast is used to deliver updates to all of the clients in order to keep them synchronized and use the SUMD and remote semaphores approach on top of it. Our work comprises of an Android application for 3D input, a 3D drawing windows application projected on a large (or small) display with remote collaboration capability, and a middleware server application. Our approach can be used by others to use smartphones as a 3D input device for computers as well design CVEs with quick and effective synchronization using the concepts of SUMD and remote semaphores.

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