Nguyen Quoc Dinh

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In this paper, we propose a distributed traffic-aware routing system for wireless sensor networks with multiple sinks. In multisink networks, traffic moving toward one sink may congest that moving toward others. The algorithm presented here considers the traffic of surrounding neighbors before jumping to any sink. We accomplish this by building, for each(More)
In this paper, we propose a clustering algorithm to enhance the performance of WSNs. In each cluster, a multi-level hierarchical structure can be applied to improve on throughput, delay, and energy consumption. In each cluster, besides the cluster head, some nodes can be selected as intermediate nodes according to their positions; INs are responsible for(More)
The International Society of Automation has recently released ISA100.11a as a standard for reliable and security application in industrial application, in addition to be compatible with existing wired and wireless networks. ISA100.11a, like WirelessHART, uses TDMA scheme in medium access layer to provide deterministic services. However ISA100.11a adopts the(More)
SUMMARY Targeting the transition from a coaxial wave guide to a coplanar wave guide (CPW), a microwave and millimeter-wave wide-band coaxial-to-coplanar transition is proposed. This design connects the coaxial inner conductor to the CPW center conductor in a perpendicular manner to directly couple, on the same plane, the radial high-frequency electric field(More)
This study proposes a dynamic guaranteed time slot (GTS) allocation scheme in order to realize a transmission scheme for periodic data in an industrial environment. Further, a personal area network (PAN) coordinator can share the same GTS slot with several nodes using transmission deadline, network utilization, and transmitting rate. The proposed scheme can(More)
In this paper, the authors propose 2 structures of UWB antennas: one operates as a magnetic dipole with the size of 15 mm × 26 mm × 1.6 mm and the other operates as an electric dipole with the size of 9 mm × 64 mm × 1.6 mm. The proposed antennas can work in the frequency band 3.1-10.6 GHz with VSWR ≤ 2. They also can be(More)
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