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In this paper, a simple and compact fiber-optic sensor based on an overcoupled tapered fiber coupler is studied. The coupler is fabricated to be operated well beyond the initial coupling cycles, where the rapid exchange of energy between outputs ports enable the fabrication of a highly sensitive device. The suitability and sensitivity of the proposed scheme is demonstrated by measuring refractive...
A detailed experimental study of a simple and compact fiber optic sensor based on a fused biconical fiber coupler is presented, in which the sensitivity is improved by operating the coupler beyond the first coupling cycle. The sensor is demonstrated to perform high sensitivity measurements of refractive index changes by means of variation of sugar concentration in water. The device is operated to...
Multiple-input multiple-output (MIMO) communication systems enable high data rates to be achieved compared to single-antenna systems, however, they also incur a huge complexity cost to the receiver. For tree search MIMO detection techniques such as the K-best algorithm, the critical path length of the detector is also found to scale linearly with the number of antennas, which limits the maximum clock...
In this work, TEM dark-filed off-axis holography using objective lens was investigated to study strain distribution in Fin structure induced by stress liner. Compared with Lorentz lens mode holography, objective lens holography provides much more improved spatial resolution and contrast which are critical for reliable strain measurement of small structures such as FinFETs. Result was also compared...
The task of Intrusion Detection Systems (IDS) in Wireless Sensors Networks (WSNs) is to monitor sensor network systems; detecting possible intrusions in the WSNs environment, alerting users after intrusions had been detected and reconfiguring the network if possible. In this study a Distributed IDS for WSNs was developed. Distributed IDS is implemented using TMote sky wireless sensor for testing and...
In grid computing a loosely coupled and virtual computing infrastructure is created out of a collection of connected heterogeneous processors sharing various combinations of resources. It is pertinent to note that African Small and Medium Enterprises (SMEs) cannot participate in the global market using the current e-business solution due to the lack of or nonexistent infrastructure to support such...
This study developed a modification to the selective repeat Automatic Repeat reQuest (ARQ) error control scheme with a view to reducing the delay involved in the reordering of the misordered data in data communication networks. The proposed scheme tagged "Pointer Based Selective Repeat" (PBSR) consisted of transmission, retransmission and resequencing buffers. The schemes were modelled and...
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