UniMAP RIS :: Browsing Conference Publications by Issue Date

This project is related to design of sorting facility for reducing, reusing, recycling green waste material, and in particular to invent an automatic system to distinguish household waste in order to separate them from the main waste stream. The project focuses on thorough analysis of the properties of green household waste. The method of identification is using capacitive sensor where the characteristic data taken on three different sensor drive frequency. Three types of material have been chosen as a medium of this research, to be separated using the selected method. Based on capacitance characteristics and its ability to penetrate green object, optimum identification method is expected to be recognized in this project. The output capacitance sensor is in analogue value. The results demonstrate that the information from the sensor is enough to recognize the materials that have been selected.

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Publication

Assessment of functional and dysfunctional on implant stability measurement for quality of life

( 2017)

Norshahrizan Nordin

;

Razli Che Razak

;

Mohd. Mustafa Al Bakri Abdullah

;

Muhammad Safizal Abdullah

;

Fauziah Che Mat

;

Abdul Hamid Adom

This study was conducted to investigate the effect of an implant wearer comprising among orthopedic patients as well as the use of implant dentistry in Northern Malaysia. A total of 100 questionnaires were distributed and 70 questionnaires can be used to record, analyze and test hypotheses. Data for all variables were collected through a questionnaire administered alone and analyzed by using SmartPLS V3. A total of four (4) hypotheses have been formulated and the results show that the hypothesis is supported. The results show that: (1) limit the functionality and quality of life was significantly (0.904) in connection with the implant wearer, (2) physical pain was significantly (0.845) relating to the quality of life, (3) physical discomfort was significantly (0.792) in connection with quality of life, and also (4) social discomfort is significant as well (0.809). This finding suggests that there are positive effects on the implant wearer who through life routine. The results of the study may also serve as a basis for reliable decisions related to quality of life and for the implementation of awareness campaign that increase how the need for humanity in the field of quality involvement.

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Publication

Integration of asset tracking system through trilateration method as detection mechanism

( 2019)

M A Fadzilla

;

Shahriman Abu Bakar

;

Azizi Harun

;

Mohd Sani Mohamad Hashim

;

Zuradzman Mohamad Razlan

;

Wan Khairunizam Wan Ahmad

;

Z. Ibrahim

;

Abu Hassan Abdullah

;

J.S.C Turner

;

K.A.A Kassim

;

M.S.A Khalid

;

Z. Jawi

;

M.H.M Isa

;

Rizalafande Che Ismail

Demands for localization system has been growing rapidly in the last several years both for an outdoor and indoor area. In conjunction with this, the capability and reliability of this system to precisely locate and track objects of interest for the indoor area has catered researchers and study on how to do so. One of the major ideas on making it more advance is by incorporating the use of wireless devices into the system. There are numbers of issues that could interrupt the efficiency and success of the system. One of the main problems is the signal loss mainly caused by the attenuation of the signal as they propagate through from the transmitter to the receiver. These attenuations are mostly due to the surface types the signal are traveling on and the objects that are in the Line of Sight in between the transmitter and receiver. In order to ensure the most reliable and efficient wireless connection between transmitter and receiver, a propagation study on the signal is needed for us to analyze and find the best way to trade off the signal attenuation based on the environment surrounding the system. By doing so, a thorough system that has models that can work efficiently even if we are to consider the attenuation factors. The system consists of nodes installed inside the research institute that acts as both transmitter and receivers. The transmitter and receiver will then process the signal that will then determine their location. The receiver is connected to the laptop in order to get a real-time reading so that we will be able to locate the transmitter. A networked of nodes are installed inside the research institute for experiment and the layout of the research is conferred for future references. Data from the experiment are then analyzed and a model for the signal propagation alongside the research institute is created. This model will be able to apprehend the signal attenuation despite the surrounding environment such as furniture and walls. A completed asset tracking system with models of signal attenuation will be built in the future for a more efficient signal transmission.

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Publication

An overview on overvoltage phenomena in power systems

( 2019-06-28)

N. S. Othman

;

Mohamad Nur Khairul Hafizi Rohani

;

Mustafa W. A.

;

Wooi Chin Leong

;

Afifah Shuhada Rosmi

;

Shakur N.F.M.

;

Juliangga R.

;

Wan Khairunizam Wan Ahmad

;

Zunaidi I.

;

Zuradzman Mohamad Razlan

;

Shahriman Abu Bakar

Overvoltage happens in a condition where the voltage is increased and exceed its design limit. This situation may lead to harmful damage to machines or related equipment that connected to the system. Overvoltage can exist in a form of transient, voltage spike or permanent, depending on its duration. Types of overvoltage consist of lightning overvoltage and switching overvoltage. Overvoltage that caused by lightning is considerate as natural phenomena, while switching overvoltage exists from the system itself, either by the interruption of faults or inappropriate connection of circuit breaker contacts. This paper is discussed about overvoltage phenomenon including causes and effects of overvoltage and overvoltage protection towards power system.

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Publication

Comparative study of optimization algorithms for SHEPWM five-phase multilevel inverter

(Institute of Electrical and Electronics Engineers (IEEE), 2020)

Muhammad Aniq Shahmi Bin Bimazlim

;

Baharuddin Ismail

;

Muhammad Zaid Aihsan

;

Siti Khodijah Mazalan

;

Muhammad Sirajuddin Muhammad Azhar Walter

;

Mohamad Nur Khairul Hafizi Rohani

Conversion of DC to AC is widely used as an essential need for the power system to harness renewable power source in this era. Multilevel inverter is a mechanism which capable of harnessing these renewable energies. Unfortunately, harmonics occur in the system due to distortions and causing much unwanted problems at the power output. Therefore, the elimination of harmonics and reduce Total Harmonics Distortion (THD) are needed to maintain good power output. Application of Selective Harmonics Elimination Pulse Width Modulation (SHEPWM) can be used in the multilevel inverter to solve the problem. In this paper, optimization algorithms such as Particle Swarm Optimization (PSO), Whale Optimization Algorithm (WOA) and Sine Cosine Algorithm (SCA) were applied for finding suitable switching angle for SHEPWM. The calculated switching angle was applied into seven-level five-phase multilevel inverter for various modulation indexes. In addition, the simulation of the multilevel inverter also done using PSIM software. The results show that the selective lower order harmonics, 3rd and 7th are completely eliminated for all three algorithms. In addition, the time taken for newly discovered algorithms to find switching angles for seven-level five-phase inverter is faster compared to PSO.

Publication

Feasibility, sizing and economic analysis of solar energy system for green Swinburne campus

(Institute of Electrical and Electronics Engineers (IEEE), 2020)

Mohamed Ashfaaq Riphque

;

Hadi Nabipour-Afrouzi

;

Wooi Chin Leong

;

SanChuin Liew

;

Kamyar Mehranzamir

;

Jubaer Ahmed

In 2011 alone, Malaysia has spent a hefty RM14.5 billion in buying fossil fuels to generate electricity. With the cost of fossil fuels rising each year, the nation is looking to rely on more sustainable energy sources. One way to decrease the reliance on fossil fuel is to minimize electricity consumption or use renewable energy sources. This research tests if it is feasible to run the Swinburne campus with Solar photovoltaic (PV) cells. This study aims to design and implement a PV energy system to power Swinburne University of Technology Sarawak. The design of the PV system is performed with the collection of the solar irradiance in Kuching, load profile of the Campus and the area required to layout the panels. Block-E of Swinburne is chosen for the PV system since all Swinburne blocks together consume very high power and do not have the required area for the panels. A Grid-Tied system is considered for the PV design. MATLAB software is used to size the PV system. Economic analysis such as Levelized Cost of Energy (LCOE), Life Cycle Cost Analysis (LCCA) and payback period is studied for the PV system.

Publication

Early childhood degree students as digital software designers based on 21st-century learning skills

(IOP Publishing, 2020)

Rosmah Abd Ghani

;

Hazlina Awang Lah

;

Roshidah Mat

;

Mohd Nazri Abdul Rahman

;

Ismail Sulaiman

;

Wan Azani Wan Mustafa

This study is an early analysis of the ability of IPGKSM's early childhood education PPISMP educator to become a multimedia courseware designer. The student's ability was tested only through digital material production workshops over a limited period of time. Analysis of these findings is divided into three important stages; an early perspective of multimedia technology learning, basic technology learning (digital image manipulation), advanced multimedia technology learning (interactive interface design and visual programming). 6C Skills is a skill that is included in the skills needed in 21st-century learning skills. Two 6C skills tested in this study are creativity and critical thinking. The findings show that educators are capable of designing multimedia software if given space and opportunity.

Publication

Effect of RTV coating on the electrical performance of porcelain insulator string under dry condition

(IOP Publishing, 2020)

Mardianaliza Othman

;

Muzamir Isa

;

Z C M Kasa

;

Mazlee Mohd Noor

;

M A M Piah

Pollution flashover is one of the primary reasons cause to power system failure in Malaysia. The presence of accumulation on the porcelain insulator surface reduces the electrical performance and also causes the failure of insulation in transmission and distribution lines. This research presents a study on the effect of Room Temperature Vulcanize (RTV) coating on the performances of a string porcelain insulator and their impact on environmental contamination. An attempt has been made to simulate the electric field distribution of 33 kV insulators using the finite element method (FEM). From the simulation results, the maximum electric field distribution is obtained at the pin insulator of a clean insulator, while the cap insulator indicated the minimum electric field. With the existence of the contamination layer, the electric field distribution of the porcelain surface results in a reduction trend.

Publication

Improved hill climbing algorithm with fast scanning technique under dynamic irradiance conditions in photovoltaic system

(IOP Publishing, 2020)

Ali Jawad Khadhim Alrubaie

;

Mohammad Faridun Naim Tajuddin

;

Tekai Eddine Khalil Zidane

;

Azralmukmin Azmi

The perturb and observe (P&O) algorithm is an easy and effective method used for tracking maximum power point. However, this technique suffers from deviation when irradiation changes suddenly. Moreover, the impact of this deviation is high when the insolation variation is rapid. This error is due to the incorrect decision taken by the conventional P&O method throughout the first step-change in the duty cycle during the increase in irradiation. The proposed P&O is a modified conventional P&O that focuses on using additional dI parameter with variable step size ΔDn. In this manner, the conventional P&O algorithm is allowed to identify the source of deviation caused by rapid irradiance changes. The efficiency of the proposed P&O is assessed using simulation in MATLAB/Simulink. Results show that the proposed P&O effectively tracks maximum power and prevents deviations in rapidly changing climate conditions within a short time, which is lesser than the conventional P&O method. In addition, the proposed P&O has a rapid dynamic response. A DC–DC boost converter is utilized in this work to validate the proposed P&O algorithm.

Publication

Load shedding analysis on microgrid during island mode

(IOP Publishing, 2020)

Nur Najihah Abu Bakar

;

A’lia Najwa Muhamad Azmi

;

Norfadilah Rosle

;

Siti Sufiah Abd Wahid

;

Mohd Sufian Ramli

This paper evaluates implementation load shedding strategy in island mode of microgrid(MG). Microgrid normally operates in interconnected mode either with the medium voltage(MV) and low voltage(LV) network. Microgrid can function both in grid and island mode connected. As electricity demand increases, microgrid deployment becomes an attractive option to meet energy demands. Microgrid during utility grid failure, however, suffers from crucial stability problems come from many aspects. Load Shedding Strategy (LSS) is one of the method used to sustain operation of power system in stable state. The main objective in this paper is to analyze the implementation of Load Shedding Strategy (LSS) on two different cases. The simulation model developed from a mix of generator, photovoltaic cell of source and the lumped load. ETAP software was used in analysing the result.

Publication

Analysis of flexible antenna performance on partial discharges detection

(IOP Publishing, 2020)

Nur Adyani Mohd Affendi

;

Melaty Amirruddin

;

Salsabila Ahmad

This paper reports a short finding on the use of a flexible substrate in the design of Partial discharge (PD) detection antenna. This flexible antenna was designed and simulated using CST Microwave Studio to detect corona discharge which is one types of PD that occur in power transformers. The flexible substrate that been used in designing the antenna is paper that has permittivity of 3.2 and the chosen frequency is between 300MHz until 3GHz. The overall dimension is 208×168×1.6 mm3. The simulations of the antenna’s return loss were conducted under two conditions; 1) flat and 2) bending along H- planes. The result were been analysed to understand the performance of paper properties, so that practical system requirements are met. This implies that the performance of paper antennas can be used in the PD field with altering some of the characteristic to upgrade its performance.

Publication

Simulation of multiple pulse width modulation (MPWM) transformerless photovoltaic inverter (TPVI) system

(IOP Publishing, 2020)

M Masri

;

Muhammad Irwanto Misrun

;

H Alam

;

Y M Mashor

Pulse width modulation technique is always applied in the design of inverter. The output voltage waveform of inverter is not relative pure sinusoidal, especially if it is applied linear pulse width modulation. A non-pure sinusoidal voltage waveform can affect the life time of inverter and also the alternating current (AC) loads. The inverter always also uses a transformer that can increase the losses and reduce the efficiency. A technique of multiple pulse width modulation (MPWM) is suitable to be applied in the transformerless photovoltaic inverter (TPVI) system. It can generate pure sinusoidal voltage waveform and increase the performance of inverter. This paper presents a simulation of MPWM TPVI system using SIMULINK MATLAB. It consists of pulse driver circuit to drive four MOSFETs in the full bridge inverter circuit with the output voltage waveform still multiple pulse wave and it is converted to be pure sinusoidal voltage waveform by applying a LC filter circuit.

Publication

Mechanomyography: an insight to muscle physiology

(Springer, 2020)

Irsa Talib

;

Kenneth Sundaraj

;

Lam Chee Kiang

;

Md. Asraf Ali

;

Jawad Hussain

The aim of this review article is to highlight an important application of mechanomyography as a tool to study muscle physiology related issues. Skeletal muscles are of vital significance in our body and contribute well towards all type of movements. Although, there are other techniques in vogue used for non-invasive assessment of muscle. But mechanomyography (MMG) do offer shear benefits for reliable muscle study. So, a substantial number of related articles were searched for this technical review from various databases including SCOPUS, PubMed, ScienceDirect, IEEE Xplore and springer link. Records were screened according to the selection criteria. The studies related to muscle physiology aspects analyzed using MMG were only selected for detailed analysis. During in depth analysis of records finally selected for this article, physiology aspects investigated via MMG were divided into seven sections including muscle stiffness, Parkinson disease, effect of dehydration, muscle contractile properties, muscle contraction mechanics, muscle temperature and muscle hypertrophy. The findings of this review suggest that MMG is a useful and reliable tool to investigate muscle physiology and it has significant applications in sports and medicine. Muscle contractile properties can be employed for future investigation on muscle fatigue, stiffness, atrophy and even functional mechanics of muscle. This review might fill the gap in knowledge in understanding of muscle physiology using MMG.

Publication

Review of feasibility wind turbine technologies for highways energy harvesting

(IOP Publishing, 2020)

Liew Hui Fang

;

Baharuddin Ismail

;

Abd Rahim, Rozemizi

;

Muzamir Isa

;

Hassan, Syed Idris Syed

Wind energy is one of the non-conventional forms of energy and it is available in affluence. It is also claimed that the wind power is pollution-free, replacement of fossil fuel and that its source of energy is freely available. Electricity can be generated with the help of a wind turbine generator. In this paper, a comprehensive study on contemporary portable wind energy harvesters has been conducted. The different existing performance such as reliability evaluation models, various problems related to structure wind turbine components (blade, gearbox, generator and transformer) and grid for wind energy system have been discussed. At the same time, experimental analysis is focused on behaviour, especially characteristics of impact wind energy, performance as lots of advanced research work has already been done or going on the harnessing of natural wind energy. In this review paper, a different model wind turbine has been studied from previous testing purpose presented. This review aim of utilizing this wind energy in a most effective manner to get the maximum electric output, and therefore the government can think over implementing the suitable type of wind turbine configuration selected highway at low cost as our installation site taking the advantage of the moving vehicles on both sides of the road.

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Publication

Effect of environmental temperature and humidity on different metal oxide gas sensors at various gas concentration levels

(IOP Publishing Ltd., 2020)

Abdulnasser Nabil Abdullah

;

Kamarulzaman Kamarudin

;

Syed Muhammad Mamduh Syed Zakaria

;

Zaffry Hadi Mohd Juffry

;

Abdul Hamid Adom

Metal Oxide (MOX) semiconductor gas sensors have been widely used in monitoring targeted gases that are present in the environment. This type of gas sensor can also be utilized as a safety device to detect the source of gas leakage. Their uses in many applications are due to being user-friendly, lower in cost, high sensitivity and relatively quick response time. However, there are several factors that could affect their performance. This work investigates the effects of the changes in ambient temperature and humidity on the readings of these sensors at various gas concentration levels. A PCB board was developed, which consists of temperature and humidity sensors, as well as eight different MOX gas sensors (TGS2600, TCS2602, CCS803, MiCS552, GM-402B, GM-502B, GM-702B and MiCS6814). The board was subjected to various temperatures (16˚C to 30˚C) and humidity levels (45% to 75%). At each of these parameter settings, the gas sensor responses were recorded at different ethanol gas concentrations. The results of the study showed that the temperature and humidity affected all the gas sensor response. The magnitude of the sensors responses was observed to decrease with rising temperature and humidity levels, except for MICS6814 (NH3 sensor) which responses in the opposite manner. Hence, there is the need to take into consideration of the drift of gas sensors’ responses when there are changes in temperature and humidity.

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Publication

Wind characterization by three blade savonius wind turbine using IoT

(IOP Publishing, 2020)

Liew Hui Fang

;

Abd R Rosemizi

;

Muhammad Zaid Aihsan

;

Muzamir Isa

;

Baharuddin Ismail

Fuel has become one of the vital energy in our life and reserves on the earth is lessened years by years. However, still wind that is renewable resource which is clean energy that can replaced a fuel. In this paper, novel idea to monitor the environmental condition and working conditions are characterized by using the small three blade Savonius wind turbines with Internet of Things (IoT) is proposed. Therefore, in terms of characterization, controlling and monitoring the status of wind turbine systems are recommended from anywhere in the world using Internet of Things (IoT) technology. In all repair work, this system is declared with IoT application and ESP 8266 to monitor, capture and diagnose problems in wind turbine. This allows the user to have a remote control mechanism remotely via secure internet web connection. This system helps users control energy sources, manually and remotely using smartphones or personal computers. This work is related to the transmission of data between two units in a timely and fast time without any disturbance. Wind turbine performance has a number of factors which determine its reliability. Next, a system for analyzing the data resulting from the rotation of the wind turbine from a distance is needed so that the study can take place at any time. The parameters that been measured using ESP8266 is voltage, current, power and wind speed. When turbine generate electric, it will display the output by thinkspeak. Various challenges, material of wind turbine and methods for condition monitoring were discussed and the results were analyzed with statistical measures and compared with its standard values.

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Publication

Review on RTV silicone rubber coatings insulator for transmission lines

(IOP Publishing Ltd., 2020)

Siti Huzaimah Kamal Hamadi

;

Muzamir Isa

;

Syahrun Nizam Md Arshad @ Hashim

;

Mardianaliza Othman

Nowadays, the usage of RTV Silicone Rubber as Insulator coatings are increased due to its advantages to avoid pollution flashover of contaminated insulator. Besides, the coatings can reduce the maintenance cost and scheduled routine. This paper had introduced the advantage of RTV Silicone Rubber coatings on insulator, such as good adhesion, nominal thickness range and good hydrophobicity. There are three method of coatings application, such as brushing, spraying and dipping. Suitable method is used to specific insulator application. Meanwhile, this paper also explained about installation of coated insulator in the field.

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Publication

Design of 30 kW three-phase string inverter using simulink

(IOP Publishing, 2020)

Fijay Fauzi

;

N Yasin

;

Leong Jenn Hwai , Jenn

;

Baharuddin Ismail

This paper presents the design and simulation of a 30 kW DC to AC inverter. The inverter is designed based on the Zeverlution Pro 33K three-phase DC to AC inverter. Currently, there are 6 units of the inverters installed at 180 kW solar power plant located at Mukim Utan Aji, Perlis. So, in this paper, the results from the computer simulation will be compared to the site measurement conducted from this power plant. In this design, pulse with modulation (PWM) is used as the switching technique. Even though PWM offers the ease of LC filter design and low Total Harmonic Distortion (THD), the voltage amplitude of the sine wave output fails to achieve the required national grid parameters, i.e. 240 Vrms. To overcome this problem, a three-phase transformer has to be incorporated in the design to obtain the desired outputs. Results from computer simulation using SIMULINK show that the targeted AC parameters for all phases were achieved after comparing with the site measurement.

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