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Partitioning network, especially some DTN, can use Message Ferry(MF) scheme to restore network connection. Message TTL describes the maximum delay tolerance of transmission and messages with out-of-date TTL should be dropped. In this paper, we will study the problem of how to design the ferry's moving route dynamically to get high message delivery ratio under the constraint of message TTL, which we...
In Vehicle Ad hoc Networks (VANETs), multi-hop broadcast is a key technique to disseminate emergency information such as Event-driven safety messages to warn drivers in case of dangerous events. When multiple vehicles receive an emergency message, packet collisions may occur if they rebroadcast the message simultaneously. In this paper we propose a power-control broadcast scheme based on studying...
Providing Internet access on buses allow people to read news, check emails, watch sport games, and hence can greatly improve the quality of people's life. This paper proposes an adaptive routing protocol, called R-BUS for a bus network. R-BUS selects a route based on the link's lifetime and its communication signal quality. The protocol takes the bus mobility and the radio propagation model into account...
In this letter, we introduce a coordinated multi-cell transmit diversity (TxD) technique which improves the existing space frequency block coding based single-cell TxD schemes by combining them with inter-cell cyclic delay. With the proposed symbol-to-subcarrier mapping rule, this novel method achieves better diversity gain over the existing multi-cell and single-cell counterparts. This design is...
According to the MSG-3 analysis, because the degradation of SSI has the characteristics of a delay-time, the threshold and repeated intervals should be considered together. So the variables to be optimized are the inspection level, threshold and repeated intervals, and an optimal inspection model for aircraft structure is developed to minimize the maintenance cost rate subject to a required reliability...
Data caching is an important technique in wireless ad hoc networks, where it can increase data availability and significantly improve the efficiency of information access by reducing the access latency and bandwidth usage. However, designing efficient caching algorithms is non-trivial when network nodes have limited memory. After analyzing the benefit function of DGA (distributed greedy algorithm)...
Real-time system identification is desirable for designing a proper feedback controller in a practical system. Digital control provides the potential advantages of on-line programmability to apply adaptive control. The digital nature of the feedback signal facilitates the communication between the converter and the processing unit (e.g., microcontroller). These features of digital control make it...
High switching frequency, high resolution digital pulse-width modulator (DPWM) is one of major challenges in the implementation of digital-controlled power converters, especially in the voltage regulator (VR) application. This paper proposes three different digital duty cycle modulation schemes to improve the resolution. Almost 10 times improvement on resolution can be achieved in the voltage regulator...
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