Mohamad Rizal Abdul Rejab
Thumbnail Image
Preferred name
Mohamad Rizal Abdul Rejab
Official Name
Mohamad Rizal, Abdul Rejab
Alternative Name
Rejab, Mohamad Rizal Abdul
Rejab, M. R.A.
Main Affiliation
Scopus Author ID
46161516300
Researcher ID
DPU-6242-2022

Research Output

Filters

1
6
6
Reset filters

Settings
Now showing 1 - 6 of 6
Thumbnail Image
Publication

Artificial Magnetic Conductor to Enhance Microstrip Patch Textile Antenna Performance for WiMAX Application

2020-12-18 , Liyana Zahid , Hanif Suhairi Abu Bakar , Khairul Najmy Abdul Rani , Thennarasan Sabapathy , Mohd Aminudin Jamlos , Mohamad Rizal Abdul Rejab , Khairil Syahmi Musa , Hamzah D. , Rashidah Che Yob , Norfatihah Bahari

A rectangular microstrip patch textile antenna with Artificial Magnetic Conductor (AMC) operated at the center frequency of 5.80 gigahertz (GHz) for Worldwide Interoperability for Microwave Access (WiMAX) application was designed and simulated using the CST Microwave Studio 2016 and fabricated in this study. The use of AMC could solve the inflexibility of FR4 substrate that limits human body movement and reduce the radiation scattered on the human body whilst increasing the antenna gain and directivity. The antenna consists of 5 5 square shape gap of AMC unit cells ground layer using ShieldIt Super, five substrate layers using cotton (viscose) fabric as well as patch layer and another ground layer using the same ShieldIt Super. AMC is a metamaterial that imitates the conduct of zero reflection phase of Perfect Magnetic Conductor (PMC) on the resonant frequency not evidently existed in nature. Overall, the antenna with AMC has the significant return loss, S11 below than -30 decibel (dB), gain improved to more than 8 dB, and directivity elevated to more than 9 dBi at resonant frequency near to 5.80 GHz, respectively.

View
Thumbnail Image
Publication

Fabrication of 110 Silicon Nanowire Oriented with Direct Band Gap

2020-12-18 , Tijjani Adam , Dhahi T.S. , Khairul Affendi Rosli , Jaafar M. , Jaafar R. , Mohd Fikri Che Husin , Mohd Norhafiz Hashim , Mohamad Rizal Abdul Rejab

Today, the challenges of getting fast switching semiconductor device based device is the phonon generation mechanism for light-emitting by device such as diodes. The increase in efficiency of the device determine by the green light part of the emitted light spectrum. Silicon nanowire growth in the direction of 110 structure has indirect band gap, which tremendously improved the green emission efficiency at the lower Nano regime. Several band structure calculations have be predicted direct band for 110 growth silicon nanowire. Thus, the study report the fabrication of silicon nanowires with diameter between 20 to 50nm which demonstrate the direct nature of the band gap. A strong photoluminescence at wave spectrum of 597 nm with micro-second lifetime indicating it direct band gap. This study have demonstrated new nanostructure engineering based on silicon nanowire orientation which will allow new ways getting silicon nanowire functionality.

View
No Thumbnail Available
Publication

Cross-layer optimization for VANET city scenario using Taguchi mechanism

2022-02-14 , Aznor Hanah Abdul Halim , Rohani S Mohamed Farook , Mohamad Rizal Abdul Rejab , Mohd Fairuz Muhamad Fadzil , Elias S.J. , Dawam S.R.M.

Because of the dynamic vehicle density, vehicle speed, and unexpected and harsh communication environment, the Vehicular Ad Hoc Network (VANET) differs from conventional ad hoc networks in terms of functioning. VANET has two primary applications: safety and non-safety. Network optimization is one method of preserving current protocols and other network characteristics rather than inventing and implementing new enhanced protocols, which is prohibitively expensive. As a result, this study proposes an optimization city scenario of VANET for maximizing throughput and packet delivery ratio (PDR) while reducing delay using the Taguchi method. For three target performances evaluated, packet size has the highest rank control factors for two conditions. Packet size plays the major control factor in contributing to lower delay and maximizing throughput. Therefore, packet size is a major control factor and is applicable for optimizing both safety and non-safety applications focusing on the city scenarios of VANET.

View
No Thumbnail Available
Publication

Motion detection system for recognition of early sign of depression

2022-02-14 , Aliza Ya'Kob N.A. , Rohani S Mohamed Farook , Aznor Hanah Abdul Halim , Mohd Fairuz Muhamad Fadzil , Mohamad Rizal Abdul Rejab , Elias S.J.

Depression is one of the mental health disorders that affect many humans, especially campus students. In certain cases, people with depression-prone to commit suicide without any warning signs and symptoms observed by family and friends. There is a need to be able to identify and proceed for treatment from the professionals as soon as possible. There is a lack of tools to identify students' depression behavior through quantified motion characteristics. The advancement of algorithms could be used in detecting such behaviors. This research is motivated to classify depression among students using artificial intelligence. The motion characteristics are quantified using accelerometer and GPS data and trained using neural networks to enable human activity prediction. Once predicted the prone to depression behavior notification will be sent to alert the user on their mental health condition. The user should react and respond to the alert and meet their doctors for further treatment.

View
Thumbnail Image
Publication

The Stability of The Combat Technique in Seni Silat Cekak Malaysia

2024-06-07 , Aznor Hanah Abdul Halim , Rohani S Mohamed Farook , Mohamad Rizal Abdul Rejab , Mohd Fairuz M. Fadzil , Mohammad Shahril Salim

This paper presents the stability of the performer of Seni Silat Cekak Malaysia (SSCM) when performing the combat technique of SSCM buah jatuh, especially the Buah Kilas Hadapan (BKH). Comparisons are made when SSCM practitioners perform the movement with and without a sparring partner. The analysis of the study refers to the Center of Gravity (COG-Centre of Gravity) on the sole of the left foot that supports the SSCM performer's body when performing the movement of BKH. This study was conducted using Motion Capture System. The Oqus (camera) is placed around the platform which is used to record the movement of the human body through markers attached to the body. The data obtained is stored and processed through Qualisys Track Manager (QTM) and Visual 3D software. Data on the movement of BKH was recorded on two SSCM respondents of different genders. The Center of Gravity Point on the left foot of the SSCM practitioner was compared and analyzed. Axis changes on the left foot of SSCM respondents are mainly focused on the medial and lateral axis (left and right) when performing the BKH. The results of this study show a minimal coordinate change on the axis (0.02m to 0.06m) from the medial and lateral angles of the Center of Gravity on the left leg of the SSCM respondents proving that the BKH is stable.

View
Thumbnail Image
Publication

Real-Time Flood Monitoring System Using Raspberry PI

2020-12-18 , Fairuz M.F.M. , Mohamad Rizal Abdul Rejab , Rohani S Mohamed Farook , Aznor Hanah Abdul Halim , Najihah Abdul Rashid , Rifaat M.N.M.

Flood has been a major concern for a very long time and the inability to monitor it in real-time has been a major disadvantage in maintaining a healthy hydrologic process. The main problem in monitoring flood is the amount of time taken for data to reach users and how long the data is relevant for as in monitoring flood, timing is the crucial key. This research proposes a Real-Time Flood Monitoring System that can aid in monitoring flood more efficiently. The system utilizes a set of sensors connected to a single-board computer that determines values in which is vital in monitoring flood. To ensure a fast transmission of data, the values are transferred over Wide Area Network (WAN) to host these values on a remote server. The remote server hosts these data on a website and application which is made accessible for the public with an ease of access. As a result, it can be viewed by users who wish to know the necessary values in determining danger level and further actions can be taken in ensuring their safety. Data which is transferred on real-time allow less time to be taken in order for the news to spread around as time is very crucial in saving people from natural disasters. These data also have a great importance for safety enforcement to be used in determining safety precautions that can be taken in order to ensure the safety of people around a particular area.

View