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Railway Track Structural Health Monitoring System
Fatima Imdad,Muhammad Tabish Niaz,Hyung Seok Kim 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10
Railway is one of the most used means of transportation. For the railway system to operate flawlessly constant monitoring and inspection of railway tracks is required. Currently railway track inspection and monitoring is done manually which is time taking and not accurate, due to the high chance of human error occurrence. Moreover, practically it is impossible to inspect and monitor the railway track manually as they run thousands of miles. To avoid this we propose a prototype system, designed for continuous monitoring of railway tracks using a combination of sensors. These sensors collect data and through computational analysis faults in the railway tracks are identified. The collected data can help in finding cracks in the tracks and catastrophic accidents can be avoided.
Niaz, Muhammad Tabish,Imdad, Fatima,Soomi Kim,Hyung Seok Kim IET 2017 IET optoelectronics Vol.11 No.4
<P>This study proposes a receiver for an asymmetrically clipped optical orthogonal frequency-division multiplexing system that utilises the total least-squares (TLS) technique. Commonly used estimation techniques such as least squares, diversity combining, minimum-mean-square-error, and pairwise maximum likelihood ignore the perturbation present while estimating the received signal, which causes the estimated signal to be inaccurate. In this study, a TLS-based receiver is proposed, which takes into consideration the errors present in both the data matrix (channel) and the observation matrix (received signal). While this technique is suboptimal, it is shown that with reasonable computational complexity it has an acceptable performance in a scenario with low processing capability and low battery power. Simulations are carried out for both line-of-sight and non-line-of-sight optical channels and the performance is analysed on the basis of bit error rate versus E-b/N-0 where E-b is the energy received per information bit and N-0 is the noise power spectral density.</P>
Muhammad Tabish Niaz,Fatima Imdad,Hyung Seok Kim 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6
Wireless technology is paving its way to the next generation of communication system: 5G. As the radio spectrum is exhausted, the need for the use of free unlicensed frequency band is increasing. One of the possible solutions is to use visible light communication (VLC) for indoor applications. VLC utilizes light emitting diodes (LED) for providing illumination and data communication. Hence for VLC to work for high data rate and mobile applications, there is a need to maintain a steady received optical power distribution (ROPD) over the reference receiving plane. To tackle this issue the placement of LEDs with in the room plays an important part. This paper proposes circular LED deployment technique to improve the ROPD at the receiving plane.