Trong Duc Le

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Recommender systems for automatically suggested items of interest to users have become increasingly essential in fields where mass personalization is highly valued. The popular core techniques of such systems are collaborative filtering, content-based filtering and combinations of these. In this paper, we discuss hybrid approaches, using collaborative and(More)
In the development of various large-scale sensor systems, a particularly challenging problem is how to dynamically organize the sensor nodes into clusters and route the sensing information to a remote base station. By leveraging the spatial correlation, there have been some noteworthy clustering schemes proposed recently, such as EEDC and ASAP. However,(More)
Continuous data collection applications in wireless sensor networks require sensor nodes to continuously sample the surrounding physical phenomenon and then return the data to a processing center. Battery-operated sensors have to avoid heavy use of their wireless radio by compressing the time series sensed data instead of transmitting it in raw form. One of(More)
Flooding is a basic operation to propagate control messages in most ad hoc routing protocols. Recently, many flooding schemes have been studied to avoid the problems of severe redundancies, contentions, and collisions in traditional implementations. One of the recent efficient approaches is 1HI by Liu et aL, which uses only 1-hop neighbor information. The(More)
Flooding in wireless ad hoc networks is one of the most fundamental operations to propagate control messages in entire network. The traditional flooding scheme generates excessive packet retransmissions, resource contention, and collisions since every node forwards the packet at least once. Recently, several flooding schemes have been proposed to avoid(More)
Applications in wireless sensor networks (WSNs) experience the energy hole problem, i.e., nodes closer to the base station drain their energy much faster than nodes that are far from the base station; accordingly, the network lifetime is reduced. Recently, Medidi and Zhou have proposed a DDC approach to address the energy hole problem by assigning different(More)
Broadcasting is an indispensable operation to provide control or routing functionalities for multi-hop mobile ad-hoc networks (MANETs). In MANET, since a packet relayed by any node can reach all its neighbor nodes, broadcasting by traditional flooding is inefficient and results in severe redundancies, contentions, and collisions. In this paper, we analyze(More)
Flooding is a fundamental operation in wireless ad hoc networks to propagate control messages in the entire network. The traditional flooding scheme generates excessive packet retransmissions, resource contention, and collisions since every node forwards the packet at least once. Several flooding schemes have been proposed to avoid these problems. However,(More)