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Abundance of connected devices generate numerous data. Increased computing power of each device would enable themselves to train and generate device knowledge from collected data. In this paper, we propose a novel approach to transfer device knowledge between interoperable devices through structured data. This approach helps devices to use device knowledge from other device as input data. Reusing...
In this paper, we present a new beacon recognition method for wireless sensor devices to access beacon-enabled WSN with low-power consumption. At first, we explain necessity of the low-power beacon recognition in the beacon-enabled wireless sensor networks. By realigning network resources, we catch that beacons are in the same position in each BI (beacon interval). Then, we propose how to switch operation...
Firefighters are typically exposed to dangerous environments where a sense of vision, auditory, and direction is blocked by smoke, dusts, or flame. Some environments are even "infra-less"; power and communication infra is destroyed. Any commands and signals from outside are unavailable, so recognizing directions and making decisions are usually difficult. To protect and save lives of firefighters,...
In a multi-hop wireless network, routing is closely interdependent with scheduling as the chosen routes affect the possible schedules and vice versa. Thus it is necessary to consider routing and scheduling jointly to optimize the overall performance. In this paper, we look at the above challenge from a new perspective and present a novel ILP(Integer Linear Programming)-based optimization design for...
Radio frequency identification (RFID) is a non-contact technology that uses radio frequency electromagnetic fields to transfer data from a tag attached to an object, for the purposes of automatic identification and tracking. One of the common problems that arise in any RFID deployment is the collision between tags which reduces the efficiency of the RFID system. Dynamic framed-slotted ALOHA (DFSA)...
Clustering sensor nodes into groups is an effective way of reducing the transmission of duplicated information in energy-constraint wireless sensor networks (WSNs). The performance of clustering is greatly influenced by the selection of cluster-heads, which are in charge of creating clusters and controlling member nodes. In selecting cluster-heads, a probabilistic method where each sensor node selects...
In RFID systems, the system performance such as interrogation range and tag recognition rates may suffer from interferences among readers. The reader interference problem can be alleviated by output signal power control and spectral and/or temporal separation among the readers. However, due to the limited wireless resources, the diverse interference effects, and the constraint of user requirements,...
A novel blue-emitting Sr 3 Ga 2 O 5 Cl 2 :Eu 2+ phosphor has been synthesized by a two-step solid-state reaction. The luminescence properties have been investigated by photoluminescence (PL) spectra, and temperature-dependent PL spectra. It shows an efficient broad absorption band around 400nm, which matches well with the commercial near-ultraviolet light-emitting...
Orange-emissive Ce 3+ /Eu 2+ co-doped Sr 3 Al 2 O 5 Cl 2 phosphors were synthesized by a solid-state reaction. The large overlap between the emission spectrum of blue Sr 3 Al 2 O 5 Cl 2 :Ce 3+ and the excitation spectrum of orange Sr 3 Al 2 O 5 Cl 2 :Eu 2+ , and the shortening...
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