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Maintaining a common notion of time among communicating nodes in mobile multihop networks is crucial to the correctness of many distributed real-time applications such as target tracking, data fusion, and environmental monitoring. Achieving both synchronization accuracy and efficiency (in terms of communication and energy overheads) are important goals of a time synchronization mechanism. While these...
Spatial information processing is one of the important research contents in information technology. It is the major direction to combine geo-information technique and mobile communication technique in the spatial information processing. In this paper, we have thoroughly analyzed supporting techniques of mobile smart terminal spatial information processing system based on the spatial information's...
This paper presents a brief overview of the multidisciplinary scientific and technological research projects at Casa Paganini - InfoMus on ICT for therapy and rehabilitation, integrating computer science, multimedia, psychology and humanistic theories. Research is grounded on the understanding and modeling of non-verbal human behavior, including the role of expressive gesture and social signals in...
One very interesting trend in factory automation is the introduction of wireless networks to the factory floor. This requires investigation of problems which are not present with wired technology. Tracking of mobile nodes, as well as seamless handover are such problems. Precise clock synchronization is needed to solve these new issues. For large-scale systems it is economically unreasonable to implement...
This paper proposes a media synchronization method for real-time group communication within a multiple device environment. The method controls the output time of each media unit received at multiple devices and synchronizes them, even if the arrival time of the media unit temporarily fluctuates. This fluctuation is caused by variation in bandwidth and the network delay between different access networks...
This research is concerned with synchronization (or entrainment), and in particular on emotional synchronization, which is likely to be an important driver of collaborative processes. We focus on ensemble musical performance, an ideal test-bed for the development of models and techniques for measuring creative social interaction in an ecologically valid framework. Ongoing work and early results on...
To support real-time properties, mobile real-time operating system (RTOS) platforms have added to their classical cyclic executive model more flexible concurrency paradigms based on threads and preemptive priority-based scheduling algorithms. However, in newer mobile RTOS, the concurrency model is also going back to prior cooperative multi-tasking models similar to cyclic executives (based on active...
In this paper we introduce a distributed emulator for a pedestrian tracking system using active tags that is currently being developed by the authors. The emulator works on StarBED which is a network testbed consisting of hundreds of PCs connected to each other by Ethernet. The three major components of the emulator (the processor emulator of the active tag micro-controller, RUNE, and QOMET) are all...
In order to achieve predictability, time-triggered communication systems have been proposed for use in in-vehicle applications, in particular for safety-critical applications. Timing properties play a crucial role in a time-triggered system as activities in such a system are all triggered by the passage of time. In this paper, we propose techniques for specifying and verifying the timing properties...
The development of an open architecture for multimedia data integration and visualization in template based distributed applications is a challenge for the scientific researches. Because of characteristics of multimedia data, their management and querying techniques are unlike than those of traditional data. We can increase the potential use of multimedia data across various applications by storing...
In this paper, we present a new technique to improve the reliability of H-tree SRAM memories. This technique deals with the SRAM power-bus monitoring by using built-in current sensor (BICS) circuits that detect abnormal current dissipation in the memory power-bus. This abnormal current is the result of a single-event upset (SEU) in the memory and it is generated during the inversion of the state of...
Video signal processing algorithms are characterized by high computational complexity and high memory throughput. Since the multicore architectures can provide high computational capacity and high throughput, they suit the video processing applications very well. However, it is very difficult to deal with the increasing design complexity and cost of the multicore system. For video processing application,...
Expected growth in use and implementation of wireless sensor networks (WSNs) in different environments and for different applications creates new security challenges. In WSNs, a malicious node may initiate incorrect path information, change the contents of data packets, and even hijack one or more genuine network nodes. As the network reliability completely depends on individual nodespsila presence...
Three applications in wireless networks where model-free stochastic learning is applicable, are discussed. The learning based optimization problems are formulated and simulation results are presented. Some open issues are also discussed.
This contribution addresses the case when live packet-switched video is used to enrich circuit-switched speech calls in mobile telephony. Circuit-switched and packet-switched transmissions generally operate on completely different transmission paths resulting in different QoS in terms of delay and loss rates. In this case, video and audio data recorded at the same time are not multiplexed together...
Todaypsilas access network is migrating towards broadband IP, fixed/mobile convergence and service convergence. Thus, the next generation access network (NGAN) requires a converged optical/wireless access network infrastructure, other than the existing architecture that connect to the cellular, broadband wireless, and optical access networks separately, which complicate the network and increase the...
Video-streaming can now be offered on third-generation (3G) mobile networks. Most research efforts have focused on video download. This paper presents a detailed study of challenges faced for successfully deploying applications requiring life video upload. Both subjective and objective qualities as well as the effects of mobility are analyzed on real 3G networks. Consequently, video profiles are identified...
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