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Vehicular ad hoc networks (VANETs) is an efficient enabler for safe and efficient Intelligent Transport Systems. The introduction of intermediate vehicles improves the performance of VANETs prominently. In this paper, we introduce buses as intermediate vehicles to improve the system efficiency. We also introduce the coalition game model to study the relationships between buses and add incentives for...
RAM-model secure computation addresses the inherent limitations of circuit-model secure computation considered in almost all previous work. Here, we describe the first automated approach for RAM-model secure computation in the semi-honest model. We define an intermediate representation called SCVM and a corresponding type system suited for RAM-model secure computation. Leveraging compile-time optimizations,...
Location-based services (LBS) are available on a variety of mobile platforms like cellphones, PDA''s, etc. and an increasing number of users subscribe to and use these services. One of the basic privacy issues with LBS is that a user may not necessarily want to disclose their own location whenever they inquire about the location of places of interest to them e.g., nearest gas station, restaurant etc...
Diverse computers interconnected via mixed network equipments are commonly available parallel architecture now, and achieve good performance/price ratio. As an important parallel communication tool, MPI system is a natural choice to support heterogeneous computing platform. The paper classifies the definition of heterogeneity into three categories, and presents the issues of them in detail respectively...
Recently, many researches have focused on a multi-tiered architecture for sensor networks. The advantages of such an architecture are better scalability, energy efficiency and security. Unfortunately, the homogeneous sensor networks lack these advantages. Thus, we use this multi-tiered architecture in this paper. Wireless sensor networks are usually deployed in hostile or dangerous environments, so...
An important privacy issue in location based services (LBS) is to hide a user's identity and location while still providing quality location based services. A user's identity can be easily hidden through anonymous Web browsing services. However, a user's location can reveal a user's identity. For example, a user at home may want to ask queries such as ldquoFind the nearest hospital around merdquo...
With the widely use of satellite signals and the more data service transported by satellite signals, more information could be attained from these signals. To implement the automatic information acquisition, the fundamental parts, carrier search and data processing are necessary. The carrier search part mainly deal with the acquisition of parameters of carrier such as frequency, bandwidth. The data...
A new rate adaptation protocol EARF (enhanced ARF) is proposed for IEEE 802.11 based on ACK frame statistical information. The main idea is to assign each transmission rate a unique success threshold, which is controlled by a delay factor to quantify the responsiveness of a link adaptation, and dynamically updated along with channel condition. The proposed protocol needs no modification to the current...
An adaptive multirate auto rate fallback (AMARF) protocol is proposed for IEEE 802.11 WLANs. The key idea is to assign each data rate a unique success threshold, which is a criterion to switch one rate to the next higher rate, and the success thresholds can be changed dynamically in an adaptive manner according to the running conditions, such as packet length and channel parameters. Moreover, the...
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