Asadur Rahman | Khulna University of Engineering and Technology (original) (raw)

Papers by Asadur Rahman

Generally, the wireless network provides priority to handover calls instead of new calls to maint... more Generally, the wireless network provides priority to handover calls instead of new calls to maintain its quality
of service (QoS). Because of this QoS provisioning, a call admission control (CAC) scheme is essential for the
suitable management of limited radio resources of wireless networks to uphold different factors, such as new
call blocking probability, handover call dropping probability, channel utilization, etc. Designing an optimal
CAC scheme is still a challenging task due to having a number of considerable factors, such as new call
blocking probability, handover call dropping probability, channel utilization, traffic rate, etc. Among existing
CAC schemes such as, fixed guard band (FGB), fractional guard channel (FGC), limited fractional channel
(LFC), and Uniform Fractional Channel (UFC), the LFC scheme is optimal considering the new call blocking
and handover call dropping probability. However, this scheme does not consider channel utilization. In this
paper, a CAC scheme, which is termed by a uniform fractional band (UFB) to overcome the limitations of
existing schemes, is proposed. This scheme is oriented by priority and non-priority guard channels with a set
of fractional channels instead of fractionizing the total channels like FGC and UFC schemes. These fractional
channels in the UFB scheme accept new calls with a predefined uniform acceptance factor and assist the
network in utilizing more channels. The mathematical models, operational benefits, and the limitations of
existing CAC schemes are also discussed. Subsequently, we prepared a comparative study between the
existing and proposed scheme in terms of the aforementioned QoS related factors. The numerical results we
have obtained so far show that the proposed UFB scheme is an optimal CAC scheme in terms of QoS and
resource utilization as compared to the existing schemes.

Electromyography (EMG) measures cumulative action potential by means of voltage from our muscles ... more Electromyography (EMG) measures cumulative
action potential by means of voltage from our muscles which
means, it is related to work done. As far as we know, there is no
exact technique to estimate the mathematical relation between
work done and EMG value. In this work, we propose a
mathematical relation between work done and EMG signal with
proper curve fitting and constant parameter correction. For this
purpose, different subjects are chosen for determining work done
by lifting different known weight to a defined height and
corresponding EMG voltage is measured. Biceps Brachii and
Flexor Carpi Radialis muscles are selected for taking EMG
values in millivolts. We have considered the mean value from
collected sEMG (Surface Electromyography) results for final
analysis. From the results, it is observed that EMG voltage
maintain almost parabolic relationship with work done. In
addition, with that, considering the relationship as exact linear
and parabolic, the errors from the measured values are also
calculated. The accuracy of our proposed mathematical model is
shown numerically.

Utilization of limited resources and quality of service (QoS) improvement are the major concerns ... more Utilization of limited resources and quality of service
(QoS) improvement are the major concerns for wireless
communication networks. Excessive call blocking is a constraint
to attain the desired QoS. In cellular network, as the traffic
arrival rate increases, new call blocking probability (CBP)
increases considerably. Paying profound concern, we have
proposed a guard-band call admission control policy that reduces
the new call blocking probability with approximately steady
handover call dropping probability (CDP) that ensures QoS. Our
proposed scheme introduces the acceptance factor in specific
guard channels where new calls get access according to the acceptance factor. The analytical results prove better
performances than the conventional new-call bounding scheme
and fractional guard channel (FGC) policy.

Careful attentions must be required for analyzing high dimensional Electroencephalographic (EEG) ... more Careful attentions must be required for analyzing high dimensional Electroencephalographic
(EEG) signals. There have many discrepancy or linearity when signals are recorded at different
stimulations for a subject. When these signals are collected for different trails of a subject, there have
similarity also. In this paper, we want to measure this correspondence on the basis of correlation aspect.
For this reason, we incorporate neural network with canonical correlation analysis (CCA) as a linear and
nonlinear function. The effectiveness of the network capabilities is tested with a sine-cosine reference
signals.

Utilization of limited resources and quality of service (QoS) improvement are the major concerns ... more Utilization of limited resources and quality of service (QoS) improvement are the major concerns for wireless communication networks. Excessive call blocking is a constraint to attain the desired QoS. In cellular network, as the traffic arrival rate increases, new call blocking probability (CBP) increases considerably. Paying profound concern, we have proposed a guard-band call admission control policy that reduces the new call blocking probability with approximately steady handover call dropping probability (CDP) that ensures QoS. Our proposed scheme introduces the acceptance factor in specific guard channels where new calls get access according to the acceptance factor. The analytical results prove better performances than the conventional new-call bounding scheme and fractional guard channel (FGC) policy.

A survey of microstrip antenna is presented, with emphasis on theoretical and simulation design t... more A survey of microstrip antenna is presented, with
emphasis on theoretical and simulation design techniques.
Among several simulation techniques, Numerical
Electromagnetic Code-2 (4NEC2) software is used by means of
analyzing performance results. The wide band low profile
modified Double Inverted- FL (DIFL) antenna covers 2.4 GHz
for Wi-Fi, 5.2 GHz serving for WLAN, 2.5 GHz for WiMAX and
also 2.1 GHz for UMTS applications. The antenna provides a
total bandwidth of 850 MHz (2.0 GHz~2.85 GHz) which fully
covers the 2.1/2.4/2.5 GHz bands and also 450 MHz (4.9
GHz~5.35 GHz) which covers 5.2 GHz band. The compact
antenna is suitable in mobile phones and laptop computer for its
small size, 31×21 mm2. The antenna maintains a return loss more
than -10 dB throughout the bands. The measured results also
demonstrate that the proposed antenna has good omnidirectional
radiation patterns with appreciable gain across the operating
bands and is capable to implant within different portable devices
for WiMAX/WLAN applications.

In this paper, we propose a smart phone operated robotic system that enables the user to send com... more In this paper, we propose a smart phone operated robotic system that enables the user to send command to the mobile phone attached to the robot through mobile DTMF signal. It collects sensing data, sound, images and video scenarios from the surroundings using 3G video mobile communication. The DTMF signal is processed by Arduino with the aid of a decoder IC. Thereafter, the signal is transmitted to motor driver IC to operate the motors. LDR along with light sources are attached to provide light in case of insufficient illumination. Temperature sensors and smoke detectors are also added to the system to observe the temperature of the surroundings and detecting smoke. Obstacle avoiding technology is enabled in case of emergency failure of control. A series of object following robots are included with the system in case of risky situations thus these robots can follow the preceding robot despite any manual control. Solar panels are embodied with the system for proper power supply in case of emergency. As this total system can be controlled from distance, it can be used effectively at a rescue operation to observe the condition of the victims and provide facilitation. Rescue team can prepare themselves with necessary appliances according to the situation after watching the inside scenario. This system can be a good surveyor for the rescue workers

Call admission control (CAC) is used to estimate the new call blocking probability and handover c... more Call admission control (CAC) is used to estimate the
new call blocking probability and handover call dropping
probability where average channel holding time is very
important term to calculate these quality of service (QoS)
parameters. In this research work, we have remodeled the guard
channel scheme in different aspect and shown that there is some
valuation faults in the conventional mathematical models of
guard channel scheme. Then we have focused our prime concern
to the different average channel holding time of handover calls
and new calls as well as their effect in the estimation of QoS
parameters. Thereafter we propose an idea to recalculate the
average channel holding time in case of different values for
handover calls and new calls. We have also revealed that there is
no effect in handover call dropping probability estimation even
the average channel holding time of new calls and handover calls
are different. On the other hand, we have found that there is a
major impact in new call blocking probability for different
channel holding time for handover and new calls where our
offered theory is able to reduce the effect.

In the neoteric years, femtocell pastimes an imperious preamble in wireless networks for some of ... more In the neoteric years, femtocell pastimes an
imperious preamble in wireless networks for some of its
noteworthy idiosyncratics such as low power consumption,
spectrum reuse, improvement of indoor coverage and capacity
etc. The femtocell access point (FAP) diminishes the maintenance
and operational cost as well as handing out good Quality of
Service (QoS) and high network capacity gains. Pandemic
deployment of femtocells in a macrocellular network looks out on
numerous challenges of which interference management as well
as QoS provisioning has got the superlative ponderosity. To cope
with the technical contravention inclusive interference
management hereby we propose the implementation of optical
femtocell along with the combination of conventional femtocells
as well as dynamically assigning a user when to use FAP or
optical femto access point (OFAP). A game theoretic framework
based algorithm and priority based access with dynamic channel
allocation scheme are also proposed in this paper for ensuring
better signal to interference and noise ratio (SINR) along with to
deal with the reduction of outage probability in a heterogeneous
(HetNet) network. To demonstrate the efficacy of our algorithm,
we assimilate extensive numerical results. Our proposed model
conferment adjuvant insights into femtocell and optical femtocell
deployments in commercial buildings

Utilization of limited resources and quality of service (QoS) improvement are most important chal... more Utilization of limited resources and quality of service
(QoS) improvement are most important challenges for wireless
networks. Excessive call blocking of lower priority traffic is very
often event at higher traffic rate in multiple services. Considering
these factors, we proposed a uniform band thinning call
admission control (CAC) scheme that reduces the call blocking
probability of lower priority traffic classes with approximately
steady call blocking probabilities for the higher priority traffic
classes with ensuring the satisfied QoS. Our proposed scheme
introduces the acceptance factor in specific bands where calls get
access according to the predefined uniform acceptance factor
throughout the bands independent of channel occupancy. Else,
analytically we characterize that the performance of our
proposed scheme in the aspect of call blocking probability (CBP),
channel utilization, and overall call blocking probability are
better than the conventional fixed guard band (FGB) scheme.

Salat may be useful in warm up or in rehabilitation programs. This study explores the muscle pote... more Salat may be useful in warm up or in
rehabilitation programs. This study explores the muscle potential
and force during Salat’s movement and position that can be one
of the daily exercise and training for our muscle in course of
biomechanical response of human body. From this study, it is
possible to recognize the muscles that are involved and contract
during Salat. In case of signal acquisition, subjects selection and
data collection steps are accomplished by hardware setup. We
have analyzed the signals through Average Rectified Value and
Root Mean Square method and the locations of muscle activity
were determined to acquire the expected data. Significantly, the
signal was taken along three different muscles: Biceps Brachii
(BB), Erector Spinae (ES), and Gastrocnemius Medialis (GM)
during Salat and Treadmill exercise. A Number of healthy
subjects of male and female were chosen for assisting the study.
EMG (Electromyography) and Integrated EMG data were
recorded for several test conditions to determine active muscle
points. The findings indicate that during Salat, BB and ES
produce better EMG level for both male and female subjects
against Treadmill exercise. On the other side, GM has higher
EMG during Treadmill than Salat. By this work, we have
explored that Salat is spiritual and physical act in where, nearly
all muscles of human body become more active than any kind of
physical exercise without muscle fatigue.

Most of the paralyzed or physically disabled persons are unable to communicate with others, easil... more Most of the paralyzed or physically disabled
persons are unable to communicate with others, easily. To
minimize this problem, different types of Human-Computer
Interface (HCI) systems have been developed in recent years. In
this paper, a single channel electrooculography (EOG) based
HCI system has been proposed to increase the communication
ability as well as quality of life for paralyzed persons who cannot
speak or move their limbs. The extracted EOG signals are
processed by our EOG acquisition system and sent it to a
microcontroller unit which processes those signals for interfacing
with computer via serial communication. A Graphical User
Interface (GUI) is designed using MATLAB which contains some
buttons to help a user to express what he/she wants through
messages. A liquid crystal display (LCD) is used to show the
messages. Our experimental results show that the maximum and
minimum average time recorded for selecting 10 buttons for a
particular user are 4.27 and 4.11 second, respectively.
Particularly for selecting a button, the maximum and minimum
average time recorded by every user are respectively 5.58 second
and 1.82 second. We have found that the average button selection
accuracy is around 95%.

This paper reports the design approach and performance evaluation of an improved quality charge c... more This paper reports the design approach and performance evaluation of an improved quality charge controller for photo voltaic (PV) system. The proposed charge controller has shown satisfactory performance for charging batteries at different conditions. An efficient battery charge controller using boost regulator with Maximum Power Point Tracking (MPPT) is described to improve the performance of PV system. The results demonstrate that this paper established a charge controller which incorporates maximum power point tracking, better performance and low cost.

Utilization of limited resources and quality of service (QoS) improvement are the major concerns ... more Utilization of limited resources and quality of service (QoS) improvement are the major concerns for wireless communication networks. Excessive call blocking is a constraint to attain the desired QoS. In cellular network, as the traffic arrival rate increases, new call blocking probability (CBP) increases considerably. Paying profound concern, we have proposed a guard-band call admission control policy that reduces the new call blocking probability with approximately steady handover call dropping probability (CDP) that ensures QoS. Our proposed scheme introduces the acceptance factor in specific guard channels where new calls get access according to the acceptance factor. The analytical results prove better performances than the conventional new-call bounding scheme and fractional guard channel (FGC) policy.