Asral Bahari Jambek
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Preferred name
Asral Bahari Jambek
Official Name
Asral , Bahari Jambek
Alternative Name
Jambek, Asral Bahari
Bahari Jambek, Asral
Jambek, Asral Bin Bahari
Main Affiliation
Scopus Author ID
57195722408
Researcher ID
AAG-2050-2021

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  • Publication
    Development of Internet of Things (IOT) Based Electronic Reader for Medical Diagnostic System
    ( 2020-03-18)
    Muhammad Nur Afnan Uda
    ;
    Asral Bahari Jambek
    ;
    Uda Hashim
    ;
    Muhammad Nur Aiman Uda
    ;
    Bahrin M.A.F.
    This paper is about an experiment for performing foodborne pathogens electronic reader using wireless sensing Internet of Thing (IoT). There are limited number of electronic readers for biosensors application with wireless internet connection. This research is to overcome the problem of commercial available electronic reader based on biosensor application method that only can be perform in offline or standalone device. This paper shows a complete system on how the data from electronic reader can be collected, easily understand by user and transfer data through the wireless internet connection via platform of IoT. There are three stages that is coding modification, android application development and transmit data to cloud storage. The NodeMCU microcontroller was used as a transfer medium for transfer data to internet. The Android Studio software was used for mobile application development. While, Arduino software was used to create a programming code to upload in NodeMCU microcontroller.
  • Publication
    Design and analysis of a two-stage OTA for sensor interface circuit
    ( 2014)
    Siti Nur Syuhadah Baharudin
    ;
    Asral Bahari Jambek
    ;
    Rizalafande Che Ismail
    This paper discusses the design of an operational transconductance amplifier (OTA) circuit foruse in a capacitive sensor interface circuit. The OTA converts a differential voltage input into the current as part of a switched capacitor integrator module. In this paper, a two-stage OTA is proposed which has high gain, high output swing and low noise. The circuit wasimplemented using 0.13μm Silterra CMOS technology and simulated using the Mentor Graphic Design Architect software package. The results show that the OTA is able to achieve74dB gain and 20KHz bandwidth when operated using a 2.5V power supply, with a total power consumption of 1.3mW. © 2014 IEEE.
  • Publication
    Nano-micro-mili Current to Mili Voltage Amplifier for Amperometric Electrical Biosensors
    ( 2020-03-18)
    Muhammad Nur Afnan Uda
    ;
    Parmin N.A.
    ;
    Asral Bahari Jambek
    ;
    Uda Hashim
    ;
    Muhammad Nur Aiman Uda
    ;
    Shaharuddin S.N.A.
    ;
    Adam H.
    Amplification of nano and mircoampere electrical signal to the detectable range is essential in the biosensor field. This research is mainly focused on design an amplifier circuit to capture and amplify three different range of current as nano, micro and mili ampere and convert it to detectable voltage range as an output signal to the processing circuit. The Proteus 8 Pro software was used to design, simulate and calibrate the amplifier circuit. Firstly, current input as mili, micro and nano current were flown through 0.1 m, 10 and 10 K resistors, respectively to convert different current inputs to the similar range in micro voltage. The MAX 4238 opamp IC was used to amplify micro voltage to mili voltage. LM 358 dual operational amplifier was used to supply virtual ground to MAX 4238 amplifier. The amplified output voltage of three different current inputs as nano, micro and mili were nearly equal to theoretical outputs.
  • Publication
    Development of Voltage Amplifier Electronic Reader for Multiplex Detection of Two Electrode Electrical Biosensors
    ( 2020-03-18)
    Muhammad Nur Afnan Uda
    ;
    Asral Bahari Jambek
    ;
    Uda Hashim
    ;
    Muhammad Nur Aiman Uda
    Amperometric electrical biosensors have small current variations at nano to micro range. There are limited number of electrical based two electrode electronic readers for biosensors are commercial available because of the amplification and noise issues at nano to micro ampere current range. The electronic reader focused on design a voltage amplifier circuit to capture and amplify three different range of current as nano, micro and mili ampere and convert it to detectable voltage range as an output voltage signal. Current input as nano, micro and mili current were flown through 10 K , 10 and 10 m resistors, respectively to convert different current inputs to the similar range in micro voltage. Then, MAX 4238 op-amp IC was used to amplify micro voltage to mili voltage. Arduino Uno circuit was act as the process and control circuit to read the output voltage from the amplifier circuit. Arduino Uno circuit will convert analog signal to digital signal and then the output voltage value is display in the LCD screen. The Proteus 8 Pro software was used to design, simulate and calibrate the amplifier circuit and Arduino Uno circuit. While, Arduino software was used to create a programming code and to upload in Arduino Uno circuit. Start your abstract here.
  • Publication
    Investigation of Scribing Quality Defect of Thin Film Solar Cell Using Machine Vision
    ( 2020-12-18)
    Shuaimi R.
    ;
    Rizalafande Che Ismail
    ;
    Hazwan Hadzir M.N.
    ;
    Mohd Annuar Mohd Isa
    ;
    Asral Bahari Jambek
    Laser micromachining provide significant effect in thin film solar industrial field especially in determining cell efficiency of each panels. However, there is an issue in determining scribing failure or defect on solar module. This research aims to investigate the defects of laser micromachining process in thin film solar module in manufacturing fields. Machine vision inspection system is used as inspection tools and to investigate the defect of laser micromachining in thin film solar cells. As a result, two major defects is define which is scribe line quality and scribe line position defects in every scribe line. By identifying the defect cause by laser micromachining through machine vision, quality control plan can be taken together to prevent reoccurrence.
  • Publication
    Evaluation and Optimization of Genomic DNA Extraction from Food Sample for Microfluidic Purpose
    ( 2020-03-18)
    Muhammad Nur Afnan Uda
    ;
    Nor Azizah Parmin
    ;
    Asral Bahari Jambek
    ;
    Uda Hashim
    ;
    Muhammad Nur Aiman Uda
    ;
    Shaharuddin S.N.A.
    Contamination of various food samples became one of the critical issues in food pathogen infection. Food pathogen can be detected by using digital polymerase chain reaction (PCR) and sequencing. These methods were reliable but consuming and take a longer time for detection. The present work describes the innovation to develop a technology to extract double-stranded deoxyribonucleic acid (dsDNA) from food samples and then denatured dsDNA into and single-strand DNA (ssDNA) for further use on the chip using microfluidic device. Microfluidic device is a lab-on-chip device that consist of microfluidic channels that provide paths for biomolecules to flow to individual point of care. DNA extraction is the process by which DNA is separated from proteins, membranes, and other cellular material contained in the cell from which it is recovered. Lysis solution is used in the process of extraction the DNA to break up the cells containing DNA from protein and other cellular materials. This extraction firstly be done in the most labour-intensive in obtaining the DNA biomolecules. Extraction methods may require an overnight incubation, may be a protocol that can be completed in minutes or a couple of hours by using a commercial kit. The disadvantages of the laboratory and commercial kit is due to time-consuming, poor cost-effectiveness, the need to use big laboratory and a complicated process which need an expertise to conduct the experiment and interpret the data. This research is proposed to design and fabricate a microfluidic device that has DNA extraction capabilities. In this research DNA extraction using a commercial kit will be used as a comparison for the quality of the result. The microfluidic device can be used in health care delivery system and will help the doctors in diagnostic process to identify disease of a patient rapidly. Other than that, the output extracted from microfluidic device will be used for DNA probe target interaction for diagnostic kit. The major advantage of microfluidic device is that it consumes less time compared to the conventional chemical methods.
  • Publication
    Aluminium interdigitated electrode with 5.0 μm gap for electrolytic scooting
    ( 2024-06)
    Uda Hashim
    ;
    Muhammad Nur Aiman Uda
    ;
    Tijjani Adam
    ;
    Asral Bahari Jambek
    ;
    Ismail Saad
    ;
    Nor Azizah Parmin
    ;
    Shahidah Arina Shamsuddin
    ;
    Nursakinah Abdul Karim
    ;
    G. Yashni
    ;
    Nur Hulwani Ibrahim
    ;
    N. Parimon
    ;
    M. F. H. Rani
    The goal of the research project is to design, fabricate, and characterize an extremely sensitive biosensor for use in healthcare. Using AutoCAD software, a novel IDE pattern with a 5 μm finger gap was created. Conventional photolithography and regular CMOS technology were used in the fabrication process. A 3D nano profiler, scanning electron microscopy (SEM), high-power microscopy (HPM), and low-power microscopy (LPM) were used to physically characterize the manufactured IDE. Chemical testing was done using several pH buffer solutions, and electrical validation was performed using I-V measurements. The Al IDE was produced, with a tolerance of 0.1 μm between the fabricated IDEs and the design mask. Electrical measurements verified the flawless fabrication of the IDE, and the device's repeatability was validated by the outcomes of comparable IDE samples. For each pH buffer solution, a modest additional volume of 2 μl was used to quantitatively detect slight current fluctuations in the microampere range. Through pH calibration for advanced applications in the realm of chemical sensors using an amperometric method, this research study has verified the chemical behavior of the IDE.
  • Publication
    Design of a Huffman data encoder architecture
    (Universiti Malaysia Perlis (UniMAP), 2018-10)
    Nor Alina Khairi
    ;
    Asral Bahari Jambek
    ;
    Nor Asilah Khairi
    Wireless sensor networks (WSNs) are important in today’s technology for helping to monitor our environment. WSNs are widely used in military, medical and industrial environments. It is capable of monitoring, collecting and transmitting data to a primary server wirelessly. Wireless sensor nodes are powered by a limited energy supply such as a small battery or an energy harvester that generally produces a small amount of energy. To extend the lifetime of the device, energy consumption must be reduced. Data transmission is known to consume the largest percentage of energy in a sensor node. One method for reducing energy is by compressing the data prior to transmitting it. This study analyses the performance of the Huffman architecture in terms of compressing data that are commonly used in wireless sensor nodes. The primary module in the architecture comprises a data retriever, frequency calculator, probability calculator, Huffman tree generator and Huffman code generator. From the experimental results, the Huffman circuit architecture simulation consumed 51394 clock cycles to completely compress 366 data samples, using 3.729mW of power consumption. Based on a 20MHz clock frequency, this is equivalent to 9.5824μJ of energy consumption. Based on our analyses, the Huffman tree generator consumed the most power at 1.184mW, equivalent to 31.75% of overall power consumption.
  • Publication
    Aluminium Interdigitated Electrode Based Biosensor for Specific ssDNA Target Listeria Detection
    ( 2020-03-18)
    Muhammad Nur Afnan Uda
    ;
    Asral Bahari Jambek
    ;
    Uda Hashim
    ;
    Muhammad Nur Aiman Uda
    ;
    Bahrin M.A.F.
    Nowadays interdigitated electrode (IDE) based sensor have stimulated increasing interest in the application of biosensor filed. A large number of finger electrodes as comb structure gain high sensitivity through electrical measurements. In this paper, we have investigated Listeria bacteria detection through the electrical based IDE. Listeria monocytogenes is a food borne pathogen-based bacterium that can cause dangerous disease to human, some infection may result in death. The AutoCAD software was used to design the chrome mask of IDE sensor and the fabrication process was done using conventional photolithography method. The fabricated Al IDE morphologically analyzed using a low power microscope (LPM), a high-power microscope (HPM) and 3D profiler. Functionalization step of the Al IDE, silanization process was done using (3-Aminopropyl) triethoxysilane (APTES), immobilization process was done using carboxylic probe Listeria and Tween-20 as a blocking agent for nonspecific binding on the non-immobilized area of the biosensor surface. The biosensor was validated with complementary, non-complementary and single base mismatch ssDNA targets. Different concentration of complementary ssDNA target from 1 fM to 1 M was done for the sensitivity detection.
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