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Biomedical Signal Transmission using OFDM-based Cognitive Radio for Wireless Healthcare Applications
S. Mohandass,G. Umamaheswari 한국산학기술학회 2014 SmartCR Vol.4 No.3
This paper describes an efficient design and implementation of orthogonal frequency division multiplexing-based Cognitive Radio to achieve the reliable transmission and reception of biomedical signals over a wireless channel. This concept can be used in wireless healthcare applications where medical information can be transferred through wireless networks for remote medical procedures or examinations. The main purpose of choosing Cognitive Radio is to efficiently utilize the available spectrum. As Cognitive Radio employs smart wireless devices with awareness, sensing, learning, and adaptation capabilities, it proves to be the best solution to solve the spectrum scarcity problem. Frequency bands that are not being used by the primary (licensed) users are utilized by Cognitive Radio users. The requirements of Cognitive Radios can be fulfilled largely by employing the orthogonal frequency division multiplexing technique. Using this technique, signals can easily be adapted to channel conditions and capacity requirements, which make it suitable for Cognitive Radio applications. The radio frequency spectrum utilization can be enhanced, and interference to other users can be minimized largely using orthogonal frequency division multiplexing-based Cognitive Radio. In this paper, we investigate the opportunistic access of the white space spectrum for healthcare applications. We propose a framework for the remote monitoring and analysis of patient health based on Cognitive Radio.
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Dharmalingam Mohandass,Jian-Li Zhao,Yong-Mei Xia,Mason J. Campbell,Qing-Jun Li 국립중앙과학관 2015 Journal of Asia-Pacific Biodiversity Vol.8 No.3
Recent herbarium-based phenology assessments of many plant species have found significant responses to global climate change over the previous century. In this study, we investigate how the flowering phenology of three alpine ginger Roscoea species responses to climate change over the century from 1913 to 2011, by comparing between herbarium-based phenology records and direct flowering observations. According to the observations, flowering onset of the three alpine ginger species occurred either 22 days earlier or was delayed by 8e30 days when comparing the mean peak flowering date between herbarium-based phenology records and direct flowering observations. It is likely that this significant change in flowering onset is due to increased annual minimum and maximum temperatures and mean annual temperature by about 0.053℃ per year. Our results also show that flowering time changes occurred due to an increasing winterespring minimum temperature and monsoon minimum temperature, suggesting that these Roscoea species respond greatly to climate warming resulting in changes on flowering times.
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Performance Analysis of Uplink Cognitive Radio Transmission based on Overloaded MC-DS-CDMA
Sundararajan, Mohandass,Govindaswamy, Umamaheswari The Institute of Electronics and Information Engin 2014 IEIE Transactions on Smart Processing & Computing Vol.3 No.4
This paper reports a cognitive radio network architecture based on overloaded multicarrier direct sequence code division multiple access (O-MC-DS-CDMA). The O-MC-DSCDMA technique combines CDMA with a multicarrier modulation technique to overcome the channel fading effects. In this technique, secondary users are enabled to share the available bandwidth with the existing primary users. Two sets of orthogonal Gold codes are used to support the primary and secondary users simultaneously. The orthogonality between the spreading codes is lost due to the non-zero cross correlation between the codes and the timing synchronization error in the uplink transmission, which causes interference between primary and secondary users. This paper proposes two modified hybrid parallel/successive interference cancellation techniques for primary and secondary user base station receivers with multiple antennas to suppress the interference among users. Interference among the same group of users is cancelled by parallel interference cancellation and the interference among groups is cancelled using successive interference cancellation. The simulation results confirmed that the proposed modified interference cancellation techniques show better BER performance over conventional interference cancellation techniques.
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Diverse nectar robbers on Alpinia roxburghii Sweet (Zingiberaceae)
Xiaobao Deng,Wen Deng,Alice Catherine Hughes,Dharmalingam Mohandass 국립중앙과학관 2015 Journal of Asia-Pacific Biodiversity Vol.8 No.3
This study records for the first time three mammal species as nectar robbers on the ginger Alpinia roxburghii Sweet. We examined the behavior of nectar robbers and compared with earlier studies on a single plant species. We recorded seven species of nectar robbers: three squirrels, one bird, and three bees. Timing of robbing nectars were similar; however, robbing behavior differed among robbers. In particular, squirrels damaged the flower parts while robbing the nectar.
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Kamath Mukund Manali,Rex Arunraj,Gautham Subramaniam Ramakrishnan,Mohandass Ramya 한국식품과학회 2019 Food Science and Biotechnology Vol.28 No.2
Spirulina has emerged as the next-generationdietary supplement owing to its health benefits. Despite theadvantages, there have been reports of contamination bycyanotoxins such as microcystins that can adversely affecthuman health. Hence, there is a need to develop a robust,efficient, and cost-effective method to detect microcystinproducingcyanobacteria in these food supplements. In thisstudy, we have demonstrated a multiplex polymerase chainreaction (PCR) method for identification of microcystincontaminationin spirulina dietary supplements. Thismethod involves simultaneous amplification of phycocyaninand microcystin B encoding genes (pcb, mcyB). Thesensitivity of the multiplex PCR was assessed, and the limitof detecting mcyB along with pcb was found to be 250 fg/lL. The presence of microcystin was detected in five out ofseven fish food supplements indicating poor culture conditions. Hence, rigorous quality control is required formonitoring the spirulina food supplements.
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