This paper describes the ERMIS system, specially designed to support the fleet and personnel scheduling and management issues, as well as to support various business collaboration issues for a helicopter taxi company....
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This paper describes the ERMIS system, specially designed to support the fleet and personnel scheduling and management issues, as well as to support various business collaboration issues for a helicopter taxi company. The implemented system offers a Web-based interface for the flying and stationary personnel and a software application running on a PDA with GSM and GPS capabilities for the pilots. The information flow and the business processes of the ERMIS system are based on XML Web services which makes the system open and interoperable with other company-owned information systems.
Explicit endpoint admission control with service vector (EEAC-SV) is a solution that allows a multi-hop connection in a Diffserv network to utilize different service classes in different routers along the path, thus e...
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Explicit endpoint admission control with service vector (EEAC-SV) is a solution that allows a multi-hop connection in a Diffserv network to utilize different service classes in different routers along the path, thus enabling the network to provide QoS with fine granularity and improved network utilization. EEAC-SV relies on the QoS information in the pre-marked probing packet to select the optimal service vector. However, owing to the overhead constraint, the QoS information in the probing packet can only be conveyed in a quantized manner. The mathematical model indicates that with the same amount of overhead, the performance of EEAC-SV can be optimized with the proper packet marking strategy. In this paper, we propose the smart packet marking strategy to improve the EEAC-SV performance in terms of reducing the false routing probability. Smart packet marking is a stochastic solution which, based on the knowledge of the history of network QoS performances and user behaviors, defines the boundaries of each quantization level in such a way to improve the routing accuracy. Through extensive simulations, we demonstrate that smart packet marking outperforms the packet marking strategy that does not take stochastic information into consideration.
The incorporation of entire Saccharin molecules has been studied during the galvanostatic deposition of 2.45 T soft CoFe alloys. The results indicate that the incorporation rate of Saccharin molecules is strongly depe...
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ISBN:
(纸本)9781566775601
The incorporation of entire Saccharin molecules has been studied during the galvanostatic deposition of 2.45 T soft CoFe alloys. The results indicate that the incorporation rate of Saccharin molecules is strongly dependent on the concentration of this additive in the plating solution. This dependence shows a pronounced maximum at Csach = 0.12 g/lit, which is the result with significant practical implications. The simple physical model is developed to describe this dependence having an excellent qualitative prediction of the experimental data. The corrosion properties and surface roughness of 2.45 T CoFe alloys are found to be strong function of Saccharin concentration in the solution, i.e. Saccharin incorporation rate. copyright The Electrochemical Society.
This paper evaluates the behavioral effect of RObust Header Compression (ROHC) and packet aggregation in multi-hop wireless mesh networks. ROHC itself shows around 20% achieved rate improvement on a line of wireless l...
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This paper presents a formulation of particle filter for tracking an object in 3-D space. The 3-D tracking algorithm is derived based on bearings only tracking algorithm that is applied in tracking of an object in 2-D...
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Recently, many new flow control mechanisms derived from classic Kelly model are proposed to solve network congestion problem. They perform well in stability, fairness or robustness. However, Most of them convergence r...
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Wireless sensor networks have traditionally focused on low duty-cycle applications where sensor data are reported periodically in the order of seconds or even longer. This is due to typically slow changes in physical ...
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Wireless sensor networks have traditionally focused on low duty-cycle applications where sensor data are reported periodically in the order of seconds or even longer. This is due to typically slow changes in physical variables, the need to keep node costs low and the goal of extending battery lifetime. However, there is a growing need to support real-time streaming of audio and/or low-rate video even in wireless sensor networks for use in emergency situations and short-term intruder detection. In this paper, we present FireFly, a time-synchronized sensor network platform for real-time data streaming across multiple hops. FireFly is composed of several integrated layers including specialized low-cost hardware, a sensor network operating system, a real-time link layer and network scheduling which together provide efficient support for applications with timing constraints. In order to achieve high end-to-end throughput, bounded latency and predictable lifetime, we employ hardware-based time synchronization. Multiple tasks including audio sampling, networking and sensor reading are scheduled using the nano-RK RTOS. We have implemented RT-Link, a TDMA-based link layer protocol for message exchange on well-defined time slots and pipelining along multiple hops. We use this platform to support 2-way audio streaming concurrently with sensing tasks. For interactive voice, we investigate TDMA-based slot scheduling with balanced bi-directional latency while meeting audio timeliness requirements. Finally, we describe our experimental deployment of 42 nodes in a coal mine, and present measurements of the end-to-end throughput, jitter, packet loss and voice quality
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