Publications 2019

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https://hdl.handle.net/20.500.14170/3709

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Browsing Publications 2019 by Author "Abbasi Q.H."
  • Publication
    Assessment of worn textile antennas' exposure on the physiological parameters and well-being of adults
    ( 2019-01-01)
    Masrakin K.
    ;
    Rahim H.A.
    ;
    Soh P.J.
    ;
    Abdulmalek M.
    ;
    Adam I.
    ;
    Warip M.N.B.M.
    ;
    Abbasi Q.H.
    ;
    Yang X.
    This paper presents the assessment of short-term wireless body area network (WBAN) exposure, which is operated at the industrial, scientific, and medical (ISM) band (2.45 GHz) in the vicinity of the human body. The experiment utilizes two popular textile antenna topologies, a planar monopole and a patch antenna as the radiating sources. The objective of this experiment is to investigate whether the exposure from WBAN may influence the physiological parameters (body temperature, blood pressure, and heart rate) and the well-being of the wearer. Counter-balanced, crossover, and the single-blind method was applied in the experimental setup. P-value is the probability value, under the assumption of no effect or no difference (the null hypothesis) of obtaining a result equal to or more extreme than what was actually observed. If P <0.05, it indicates that P-value will be less than the level of significance. Thus, the null hypothesis (no effect or no difference) can be rejected, and it can be concluded that there exist effects to the respondents. The results showed that there is statistically no significant difference between the active exposure and the Sham (no exposure) which may affect the physiological parameters and well-being of the wearers, with P >0.05, which failed to reject the null hypothesis (no effect).
  • Publication
    Enhancement of the Duty Cycle Cooperative Medium Access Control for Wireless Body Area Networks
    ( 2019-01-01)
    Hammood D.A.
    ;
    Rahim H.A.
    ;
    Badlishah Ahmad R.
    ;
    Alkhayyat A.
    ;
    Salleh M.E.M.
    ;
    Abdulmalek M.
    ;
    Jusoh M.
    ;
    Abbasi Q.H.
    This paper presents a novel energy-efficient and reliable connection to enhance the transmission of data over a shared medium for wireless body area networks (WBAN). We propose a novel protocol of two master nodes-based cooperative protocol. In the proposed protocol, two master nodes were considered, that is, the belt master node and the outer body master node. The master nodes work cooperatively to avoid the retransmission process by sensors due to fading and collision, reducing the bit error rate (BER), which results in a reduction of the duty cycle and average transmission power. In addition, we have also presented a mathematical model of the duty cycle with the proposed protocol for the WBAN. The results show that the proposed cooperative protocol reduced the BER by a factor of 4. The average transmission power is reduced by a factor of 0.21 and this shows the potential of the proposed technique to be used in future wearable wireless sensors and systems.
  • Publication
    Non-Cooperative Game Theory Approach for Cognitive Cooperative Communication in WBAN
    ( 2019-08-01)
    Hammood D.A.
    ;
    Rahim H.A.
    ;
    Alkhayyat A.
    ;
    Ahmad R.B.
    ;
    Jusoh M.
    ;
    Abbasi Q.H.
    To increase the Quality of Service (QoS) of wireless body area network, we need an effective data-rate delivering method, which capably forwarding the data over several path. For this reason, we proposed a non-cooperative game approach, based on utilizing a pricing-based spectrum leasing mechanism to transmit the data over several path based on non-cooperative game theory. The parameter price c is together determined by WBAN sensor and D2D users. Then, all selected D2D users used optimized powers that can fulfil the need of the WBSN users. Numerical results show the proposed approach improves the utility of WBSN users and their throughput.
  • Publication
    Ultrathin metamaterial microwave absorber using coconut coir fibre over x-band frequency range
    ( 2019-05-13)
    Yah N.F.N.
    ;
    Rahim H.A.
    ;
    Abdulmalek M.
    ;
    Lee Y.S.
    ;
    Yahaya N.Z.
    ;
    Jusoh M.
    ;
    Abbasi Q.H.
    ;
    Mirza S.
    This paper presents the new design of simple one layer ultrathin metamaterial microwave absorber using coconut coir fibre as the substrate. The metamaterial microwave absorber is composed of a periodic array of square loops and patches with circle cut out printed on a dielectric material which is coconut coir fibre backed by PEC. CST Microwave Studio software is used for the design and simulation over frequency range of X-Band and Ku-Band (8.2-18 GHz). From the simulation result, 90% absorption was achieved in the frequency range of 8.94 - 10.0 GHz (X-Band) with highest absorption of 99.7% at 9.37 GHz. Furthermore, the metamaterial microwave absorber has a total thickness of 1.6 mm which is only approximately 0.04λ at lowest frequency. The result shows that coconut coir fibre from the agricultural waste has a great potential to be developed further in electromagnetic wave applications particularly microwave absorber.