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Knowledge of structure is critical to map legacy workflows to environments suitable to run on the cloud. We present a method which characterizes a workflow structure with the execution trace produced by instrumented logging functionality. The method generates the structure of workflows to support their reuse by permitting their transformation into modern execution environments. The method presented...
Motor vehicle collisions are the leading cause of death in the Unites States. Rear-end crashes alone occur approximately 1.6 million times each year [1]. These statistics demonstrate the obvious need to reduce the number of vehicle collisions and save lives. In response, the government, automobile industry, and academia have conducted intensive research in an effort to enhance the safety in the U...
Using vehicles as sensors for traffic and environment monitoring is a new paradigm that opens the way to worthwhile applications. Data collected on board are usually delivered through the cellular network, with the consequent overloading risk. This paper focuses on the alternative adoption of short range vehicle-to-vehicle (V2V) and vehicle-to-roadside (V2R) communications, with particular reference...
Collision Avoidance has received serious attention in the automotive research area. There are two methodologies for collision avoidance systems: Sensor-based and ITS-based. The main goal of this work is to provide a comprehensive review of both sensor-based and ITS-based collision avoidance systems. A comparative analysis between these two methodologies and a description of possible future research...
Large datasets and time-consuming processes have become the norm in scientific computing applications. The exploration phase in the development of scientific workflows involves trial-and-error with workflow components, which can take a lot of time given the time-consuming nature of the workflow tasks. These facts suggest the possibility of reducing the development time by reusing intermediate data...
Traffic efficiency in urban environments represents an important issue to be solved in a short time. In this paper we assume to exploit vehicles as sensors of traffic conditions that periodically transmit their information to a remote control center through the cellular network. After a proper data processing at the control center, updated traffic information are transmitted back to the interested...
We consider the overhead incurred by programs that can be updated dynamically and argue that, in general, and regardless of the mechanism used, the program must incur an overhead during normal execution. We argue that the overhead during normal execution of the updateable program need not be as high as the overhead for the updated program. In light of the fundamental limitations and the differences...
Considering vehicles as sensors for traffic and pollution information is a new paradigm to monitor the environment and to open the way to an efficient smart navigation. In this work we focus on the uplink acquisition of traffic information from vehicles toward a remote control center. With the increase in the number of vehicles equipped with on board units (OBUs) enabling cellular transmissions, this...
Real time traffic information systems represent a growing sector of the wireless communication industries. To provide traffic information to drivers in a short term, cellular systems represent the answer: on the one hand many vehicles are equipped with global positioning system (GPS) navigators integrating cellular devices; on the other a large percentage of people has smart phones integrating advanced...
In this paper we provide the outcomes of a measurement campaign aimed at characterizing the UMTS femtocell propagation in an indoor scenario. The accuracy of a commonly adopted estimator of the signal-to-noise ratio is discussed, then the minimum measurement interval needed to derive an accurate characterization of the average received power is discussed. Finally we compare the measurement outcomes...
It is our pleasure to present this proceedings of the Third Workshop on Hot Topics in Software Upgrades (HotSWUp III), which took place on April 16, 2011 in Hannover, Germany. The workshop was held as a satellite event of the International Conference on Data Engineering (ICDE 2011).
In this paper we investigate the search path when building a wireless mesh network under extended ad-hoc network, and we propose a search method that can reduce power consumption. The route search part and the node part - which can be a mobile PC or a mobile phone, etc. -are combined in the proposed method. Moreover, we aim at improving the efficiency of the communication between nodes under the extended...
Efficient mobility management is an issue of vast economic importance for its consequences on urban and suburban mobility. In this context, telecommunications are gaining a key role, allowing to increase people safety, traffic efficiency, and travel comfort. To investigate the telecommunication systems behavior in new infomobility scenarios, advanced simulations tools are needed jointly taking into...
The seamless integration of heterogeneous wireless access networks is currently one of the issues of major interest in the field of telecommunication systems. In an early future technologies like UMTS, WLAN and WiMAX will give broadband access to users that perform their voice/video calls or data sessions without knowledge of the specific technology their terminals are using, following the paradigm...
Intelligent transportation systems (ITS) make use of wireless communication technologies to provide traffic efficiency and road safety without altering the existing road infrastructure. To really impact on traffic management, ITS should act in real-time, requiring updated traffic information; hence, the collection of small amounts of information frequently transmitted from a high number of vehicles...
Traffic is one of the most important problems in industrialized countries: roads are getting more and more crowded, especially during rush hours, with heavy consequences on people's quality of life, accidents, pollution, and fuel consumption. The transmission of up-to-date traffic information to on-board navigators would allow the redistribution of traffic flows over alternative routes, thus reducing...
The development of a system simulation platform for adaptive cruise control (ACC) radar working at 77 GHz is presented. The simulation platform allows us to test different radar architectures, modulation formats and detection algorithms as well as to simulate different scenarios, which improves the decision-making before and during the hardware development.
In this paper, we present a comparison of two strategies for FMCW radars. The potential presence of multiple targets implies using specific waveforms for beat frequencies association. Here, we compare performance of two such waveforms in terms of targets distance and velocity estimation. Our comparison, based on theoretical bounds derivation is validated by Monte Carlo simulations. In particular we...
IEEE802.16e WirelessMAN-OFDMA is expected to be a significant step in the evolution of communication technologies for the provision of broadband services to mobile users. Due to the large amount of parameters to be taken into account, from physical to upper layers, and the degrees of freedom left to manufacturers and operators, a simulation tool is almost mandatory along the path toward implementation...
New wireless communication technologies enable new services for infomobility. In this work we explore the feasibility of infomobility applications through multimedia broadcast multicast service (MBMS), a new feature added to the universal mobile telecommunication system (UMTS). We assume to transmit, through MBMS channels, real time traffic information to all vehicles under coverage; such information...
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