UniMAP RIS :: Browsing Publications 2019 by Issue Date

Publication

Geological effect on GPR system due to soil properties in Malaysia

( 2019-01-01)

Karim M.N.A.

;

Jamlos M.A.

;

Ibrahim S.Z.

;

Jamlos M.F.

;

Lee Y.S.

This paper present the measurement of dielectric properties of soil in Malaysia in three differences condition which are normal condition (ambience), heated (up to 50 OC) and wet condition (10 % water content). Eight (8) samples of soil have been collected in the local region and was measured in the frequency range from 0.5 GHz to 3.5 GHz for Ground Penetrating Radar (GPR) applications. The measurement of the dielectric properties has been conducted using Agilent high temperature probe (Model) integrated with Performance Network Analyzer (PNA E8362B). The uncertainties in measurement process, especially dealing with measurement data have been considered in order to eliminate the probability of error during the measurement. The measured result for permittivity and loss factor of the measured samples are tabulated in graphs and the analysis of the measured data are discussed in this paper.

Publication

Effect of surface finish on the wettability and electrical resistivity of Sn-3.0Ag-0.5Cu solder

( 2019-01-01)

Muhd Amli S.F.

;

Mohd Salleh M.A.A.

;

Mohd Said R.

;

Abdul Razak N.R.

;

Wahab J.A.

;

Ramli M.I.I.

The effect of different surface finish with Sn-3.0Ag-0.5Cu (SAC305) solder was successfully investigated. The SAC305 solder was fabricated by using casting method and solder was placed on copper substrate that coated with different surface finish. The soldering process was carried out by using F4N reflow oven followed up with the mounted and metallographic steps. Wettability of SAC305 solder was observed through contact angle formed between solder and four different surface finish located on the copper substrate. Subsequently, the electrical resistivity of solder was studied by conducted the four-point probes. The results of wettability test was found to be in the accepted range which is below 45° for all different surface finish. In terms of electrical resistivity, the results showed that the ImAg surface finish had enhanced the electrical conductivity of SAC305 lead-free solder.

Publication

Diagnosing Perioperative Cardiovascular Risks in Noncardiac Surgery Patients

( 2019-01-01)

Li P.

;

Lei Y.

;

Li Q.

;

Lakshmipriya T.

;

Gopinath S.C.B.

;

Gong X.

Every year, over 200 million adults are undergoing noncardiac surgery. These noncardiac surgery patients may face the risk of cardiac mortality and morbidity during the perioperative and recovery periods. Around ten million patients who underwent noncardiac surgery experience cardiac complications within the first 30 days of the postoperative period; the complications are myocardial infarction, cardiac death, and cardiac arrest. This cardiovascular risk is mostly faced by the patients having cerebrovascular or cardiac disease and the patients with the age greater than 50 years. Monitoring and treating cardiac diseases with a suitable biomarker during the perioperative period is necessary for the early recovery of noncardiac surgery patients. This review discussed the risk factors and the key guidelines to avoid the cardiovascular risks during the perioperative period of noncardiac surgery patients. In addition, the biomarkers and identification strategies for cardiac diseases are discussed.

Publication

Fabrication of calcium phosphate coating on pure magnesium substrate via simple chemical conversion coating: Surface properties and corrosion performance evaluations

( 2019-01-01)

Zaludin M.A.F.

;

Zahid Jamal Z.A.

;

Derman M.N.

;

Kasmuin M.Z.

The main objective of the current work was to fabricate calcium phosphate (CaP) coating on 99.9% purity magnesium, Mg substrate through simple chemical conversion method and evaluated the surface properties and corrosion performance of the coated substrates. The chemical conversion method was done by immersing the samples inside primary phosphating bath and followed by secondary treatment in alkaline solutions. The coated samples from the primary (PRI) and secondary (SEC) coating treatment were analyzed from morphological, topographical, and phase analysis aspects. The corrosion behaviour of the coatings inside simulated body fluid was assessed by potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS). The PRI and SEC coated were composed of dicalcium phosphate dehydrate (DCPD) and hydroxyapatite (HA), respectively. Both of the coatings improved the corrosion resistance of the Mg substrate. The corrosion potentials, E corr of the coated samples becomes nobler compared to the bare substrates. EIS shows that the polarization resistance, R p is improved about 40 and 2 times fold for PRI and SEC compared to the uncoated samples. Furthermore, PRI shows better corrosion resistance compared to SEC due to lower porosity along with thicker and better coating coverage.

Publication

Fabrication of quartz crystal microbalance with pegylated lipopolymer for detection of non-invasive lung cancer biomarker

( 2019-01-01)

Rahman N.A.A.A.

;

Ma'Radzi A.H.

;

Zakaria A.

This study presents a fabrication of quartz crystal microbalance (QCM) with pegylated lipopolymer for detection of non-invasive lung cancer biomarkers. The selected biomarkers for this study were propanol, ethyl benzene, hexanal and decane. QCM with fundamental frequency 30 MHz AT-cut gold electrodes were coated with lipid and pegylated lipopolymer with a terminated functional group of carboxyl and succinyl to increase sensor responsiveness towards detection purposes. The fabricated sensors could detect all biomarkers with various selectivity and sensitivity responses. Furthermore, the results from biomarker exposure indicated that the sensitivity of sensors coated with succinyl, and carboxyl lipopolymer film were better than in detection toward propanol and hexanal, while lipid was best in detection towards ethyl benzene and decane.

Publication

A Fuzzy-Based Angle-of-Arrival Estimation System (AES) Using Radiation Pattern Reconfigurable (RPR) Antenna and Modified Gaussian Membership Function

( 2019-01-01)

Jais M.I.

;

Thennarasan Sabapathy

;

Muzammil Jusoh

;

R Badlishah Ahmad

;

Jamaluddin M.H.

;

Kamarudin M.R.

;

Ehkan P.

;

Murukesan Loganathan L.

;

Soh P.J.

Angle-of-arrival (AOA) estimation is an important factor in various wireless sensing applications, especially localization systems. This paper proposes a new type of AOA estimation sensor node, known as AOA-estimation system (AES) where the received signal strength indication (RSSI) from multiple radiation pattern reconfigurable (RPR) antennas are used to calculate the AOA. In the proposed framework, three sets of RPR antennas have been used to provide a coverage of 15 regions of radiation patterns at different angles. The salient feature of this RPR-based AOA estimation is the use of Fuzzy Inferences System (FIS) to further enhance the number of estimation points. The introduction of a modified FIS membership function (MF) based on Gaussian function resulted in an improved 85% FIS aggregation percentage between the fuzzy input and output. This later resulted in a low AOA error (of less than 5%) and root-mean-square error (of less than 8°).

Publication

Comparison of different wavelength propagations over few-mode fiber based on space division multiplexing in conjunction with electrical equalization

( 2019-01-01)

Al-Dawoodi A.

;

Fareed A.

;

Masuda T.

;

Ghazi A.

;

Fakhrudeen A.M.

;

Aljunid S.A.

;

Idrus S.Z.S.

;

Amphawan A.

Nonlinearities in optical fibers deteriorate system performances and become a major performance-limiting issue. This article aims to investigate the compensation of nonlinear distortions in optical communication systems based on different wavelength propagations over few-mode fiber (FMF). The study adopted Space Division Multiplexing (SDM) based on decision feedback equalizer (DFE). Various transmission wavelength of the FMF system is applied to mitigate the attenuation effect on the system. In this paper, different wavelengths (780, 850 and 1550 nm) are used in SDM. Extensive simulation is performed to assess the attenuation and Bit Error Rate (BER) in each case. The results show that the wavelength of 1550 nm produces higher power and less attenuation in the transmission. Furthermore, this wavelength produces the best distance with less BER compared to 780 nm and 850 nm wavelengths. Moreover, the validations show improvement in BER and eye diagram.

Publication

Parameter adaptation for ant colony system in wireless sensor network

( 2019-01-01)

Nasir H.J.A.

;

Ku-Mahamud K.R.

;

Kamioka E.

The Ant Colony System (ACS) algorithm has been applied in solving packet routing problems in Wireless Sensor Networks (WSNs). Solving these problems is complicated as packets need to be submitted through sensor nodes which are spatially distributed and heterogeneous by nature. Without an effective packet routing algorithm, energy consumption will be increased while network lifetime will be reduced. Most researches are focused on optimizing the routing process by using predefined parameters within a certain range. However, this approach will not guarantee optimal performance. This paper presents the parameter adaptation values for ACS experimental set-up in validating its performance. Possible values of each parameter within a defined range were employed. Experiments were conducted to obtain the best value of each parameter to be used for throughput, energy consumption, and latency. Results of this study can be adopted to achieve optimal performance for the packet routing process.

Publication

Optimization and characterization of magnetite-reduced graphene oxide nanocomposites for demulsification of crude oil in water emulsion

( 2019-01-01)

Wai M.M.

;

Khe C.S.

;

Yau X.H.

;

Liu W.W.

;

Sokkalingam R.

;

Jumbri K.

;

Lwin N.

Oily wastewater from the oil and gas industry negatively affects the environment. Oily wastewater typically exists in the form of an oil-in-water emulsion. Conventional methods to treat oily wastewater have low separation efficiency and long separation time and use large equipment. Therefore, a simple but effective method must be developed to separate oil-in-water emulsions with high separation efficiency and short separation times. Magnetite-reduced graphene oxide (M-RGO) nanocomposites were used as a demulsifier in this work. Magnetite nanoparticles (Fe3O4) were coated on reduced graphene oxide (rGO) nanosheets via an in situ chemical synthesis method. The synthesized M-RGO nanocomposites are environmentally friendly and can be recovered after demulsification by an external magnetic field. M-RGO characterization was performed using X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, field emission scanning microscopy, Raman spectroscopy, and vibrating sample magnetometry. Demulsification performance was evaluated in terms of M-RGO dosage, effects of pH, and brine concentration. The demulsification capability of M-RGO was determined based on the residual oil content of the emulsion, which was measured with a UV-vis spectrometer. The response surface method was used to determine the optimum conditions of the input variables. The optimum demulsification efficiency achieved at pH 4 and M-RGO dosage of 29 g L-1 was approximately 96%. This finding demonstrates that M-RGO nanocomposites are potential magnetic demulsifiers for oily wastewater that contains oil-in-water emulsions. Also, the recyclability of this nanocomposite has been tested and the results shown that it is a good recyclable demulsifier.

Publication

Review of the renewable energy outlook in Saudi Arabia

( 2019-01-01)

Al-Douri Y.

;

Waheeb S.A.

;

Voon C.H.

Currently, existing technologies of energy generation based on fossil fuels and production processes of crude oil usually accompanied by flaring of gases resulted in excessive CO 2 emissions. Kingdom of Saudi Arabia (KSA) national oil consumption is increasing by 7% annually. If this growth rate continues, local demands will be doubled in a decade. This study has covered various renewable energy solutions such as solar thermal hybrid solutions, photovoltaic cells/arrays, and wind turbines. A selection of possible applications of sustainable buildings, wind farming, solar energy, and their futures are discussed. From the crisis viewpoint of energy and environment safety, architectural trends have shifted toward sustainability demands. Energy and ecology were impetus to improve the residents' life quality and health standards. The climate/building correlation has been established to observe the response between both of them. Five distinguished coastal locations in KSA have given the consideration for wind farms, where meteorological data have been recorded since 1970. In contrast to the hot and irksome weather, water misting systems are elaborated to settle a soothing atmosphere. The results are noticed for evaporation and robbing the excessive heat. It is known that health is dependent on clean and unpolluted air, and the pollution has a threat for public health everywhere. So, an induction of renewable energy future has been considered. Gas turbine technology is also discussed as it accounts for about half of the overall capability of the KSA's power generation. Temperature, humidity, and pressure conditions have been accounted as important factors that affect gas turbine performance to produce electricity. An outlook of domestic energy cost is also reviewed. Furthermore, this study has focused on the necessity of maintaining a green and clean environment as well as a climate of lowest dust content. “Reference prices” concept has been clearly comprehended and understood. The contradiction of real opportunities and marginal costs has been explained. An important issue regarding depletion of resources that are depleted exhaustible has been studied. This issue has been tackled and being showed from the starting point. Alternative solutions to provide new energy sources are assumed.

Publication

Aptamer-antibody complementation on multiwalled carbon nanotube-gold transduced dielectrode surfaces to detect pandemic swine influenza virus

( 2019-01-01)

Wang F.

;

Gopinath S.C.B.

;

Lakshmipriya T.

Background: A pandemic influenza viral strain, influenza A/California/07/2009 (pdmH1N1), has been considered to be a potential issue that needs to be controlled to avoid the seasonal emergence of mutated strains. Materials and methods: In this study, aptamer-antibody complementation was implemented on a multiwalled carbon nanotube-gold conjugated sensing surface with a dielectrode to detect pandemic pdmH1N1. Preliminary biomolecular and dielectrode surface analyses were performed by molecular and microscopic methods. A stable anti-pdmH1N1 aptamer sequence interacted with hemagglutinin (HA) and was compared with the antibody interaction. Both aptamer and antibody attachments on the surface as the basic molecule attained the saturation at nanomolar levels. Results: Aptamers were found to have higher affinity and electric response than antibodies against HA of pdmH1N1. Linear regression with aptamer-HA interaction displays sensitivity in the range of 10 fM, whereas antibody-HA interaction shows a 100-fold lower level (1 pM). When sandwich-based detection of aptamer-HA-antibody and antibody-HA-aptamer was performed, a higher response of current was observed in both cases. Moreover, the detection strategy with aptamer clearly discriminated the closely related HA of influenza B/ Tokyo/53/99 and influenza A/Panama/2007/1999 (H3N2). Conclusion: The high performance of the abovementioned detection methods was supported by the apparent specificity and reproducibility by the demonstrated sensing system.

Publication

An ability of Whatsapp usage in industrialised building system (IBS) construction project

( 2019-01-01)

Pozin M.A.A.

;

Nawi M.N.M.

;

Mydin M.A.O.

;

Riazi S.R.M.

;

Imran A.I.

In this article, we discuss about WhatsApp application practice around project managers in managing IBS construction projects. The WhatsApp application offer a great advantages, especially in collecting, managing information and data in a timely manner.Previous study highlighted effective communication become as a bridge between practitioners to share a knowledge, information and integration. Unfortunately, there is still a lack of empirical studies on how efficiencies of WhatsApp application overcome the communication barriers while managing distributed project teams on construction project. Thus this study seeks to explore communication performance perceived through WhatsApp application. The semi-structured interview methodology was used to gain in-depth knowledge from several project managers who have experiences in managing construction projects virtually through WhatsApp application. The finding from this study revealed that WhatsApp application has become an effective communication channel to overcome the barriers of communication while managing distributed teams and allowing timely information sharing.

Publication

Design and implementation of AMBA bridge protocol in System-on-Chip design

( 2019-01-01)

Suan W.H.

;

Jambek A.B.

;

Bin Md Isa M.N.

;

Bin Harun A.

;

Bin Mohya S.N.

;

Bin Abd Aziz Z.A.

The Advanced Microcontroller Bus Architecture (AMBA) is widely used in modern technology device. The design of bridge in the system is due to increase demand of power consumption and functionality. The bridge help to reduce power by separate the system into high bandwidth and low bandwidth. The goal of this paper is to design and implement the AMBA bridge into a SoC design which consists of a processor, RAM, ROM, watchdog and LED module. These peripherals are connected separately based on different bandwidth with a bridge as the medium. The result shown the bridge transfer a correct data from the ROM into the RAM. The experiment was carry out using Synopsys 2017 and Keil uVision.

Publication

A hybrid of tropical-singular value decomposition method for salt and pepper noise removal

( 2019-01-01)

Abdurrazzaq A.

;

Mohd I.

;

Junoh A.K.

;

Yahya Z.

The unknown information contained in an image that causes the change of information in the image is called noise. In this paper, we propose a new method for removing salt and pepper noise by using singular value decomposition and the concept of tropical algebra operations. To determine the performance of the proposed method, 20 test images are used as samples. Then three different image quality assessments are used: peak signal-to-noise ratio (PSNR), structural similarity (SSIM), and image enhancement factor (IEF). In addition, six different filtering methods, i.e. MF, DWMF, PSMF, MDBUTM, NAFSM, and BPDF, are used to compare the performance of the proposed method. The experimental results show that the proposed method yields better results than the existing methods, in particular the BPDF filtering method.

Publication

Breast surface variation phase map analysis with digital fringe projection

( 2019-01-01)

Norhaimi W.M.W.

;

Sauli Z.

;

Aris H.

;

Shahimin M.

;

Azmi M.A.M.

;

Wong K.

;

Retnasamy V.

;

Vairavan R.

Breast carcinoma has become one of the most frequently diagnosed life threatening cancer among women. Early detection of breast cancer is highly essential with the aid of non-contact imaging modalities. Recently, non-contact breast imaging methods based on fringe projection has been developed for breast surface change inspection. In this work, a non-contact digital fringe projection imaging modality that utilizes phase shifting fringe patterns for identifying surface changes has been developed for investigating breast surface changes caused by the presence of tumors. A medical grade prosthetic breast was used as the experimental subject and subjugated to breast changes through the enlargement of a round shaped silicon catheter as a tumor. The fringes were projected onto the breast surface based on the three steps phase shift fringe projection. The fringe patterns consisted of a large fringe width to enable the breast image to be confined in fewer fringe patterns. A resulting phase map was obtained where pixel coordinate marking was conducted on the phase map breast image. Each of the pixel's coordinate was compared to identify the location of the surface changes. A range of 2-9 pixel coordinate shifts from the 0.5 - 2 cm tumor growth were obtained from the results which demonstrated the capability of using phase map analysis from digital fringe projection in identifying surface changes of the women's breast.

Publication

Synthesis of alumina nanoparticles by sol-gel method and their applications in the removal of copper ions (Cu²⁺) from the solution

( 2019-01-01)

Mohamad S.N.S.

;

Mahmed N.

;

Che Halin D.S.

;

Abdul Razak K.

;

Norizan M.N.

;

Mohamad I.S.

Two different phases of alumina (Al2O3) nanoparticles (γ-alumina and α-alumina) have successfully been synthesized by using a sol-gel method. During the process a mixture of aluminum nitrate and citric acid (C/N=0.5) was heated at 60°C followed by 80°C until a gel was formed. The amorphous gel structure then was dried and sintered from 600°C to 1200°C. From the X-ray diffraction (XRD) analysis, crystalline structure of γ-alumina started to form at 800°C with average crystallite size of 11.5 nm, followed by the formation of the mixture phase of γ-alumina and α-alumina at 1000°C. The transformation from γ- to α-alumina occured at 1100°C of sintering temperature and above with the average crystallite size of 49 nm. The efficiency of the synthesized alumina nanoparticles as an adsorbents was tested by immersing the powder into the copper ions solution. The percentage of the copper removal was measured by using atomic absorption spectroscopy (AAS). It was found that, the efficiency of the alumina nanoparticles as an adsorbent was not depending on their phases, but might due to the increased of the particle size at higher sintering temperature. The highest percentage of removal 82.1% was obtained when using the alumina sintered at 1200°C.

Publication

Squamous Cell Carcinoma Biomarker Sensing on a Strontium Oxide-Modified Interdigitated Electrode Surface for the Diagnosis of Cervical Cancer

( 2019-01-01)

Wang H.

;

Lakshmipriya T.

;

Chen Y.

;

Gopinath S.C.B.

Cervical cancer is a life-threatening complication, appearing as the uncontrolled growth of abnormal cells in the lining of the cervix. Every year, increasing numbers of cervical cancer cases are reported worldwide. Different identification strategies were proposed to detect cervical cancer at the earlier stages using various biomarkers. Squamous cell carcinoma antigen (SCC-Ag) is one of the potential biomarkers for this diagnosis. Nanomaterial-based detection systems were shown to be efficient with different clinical biomarkers. In this study, we have demonstrated strontium oxide-modified interdigitated electrode (IDE) fabrication by the sol-gel method and characterized by scanning electron microscopy and high-power microscopy. Analysis of the bare devices indicated the reproducibility with the fabrication, and further pH scouting on the device revealed that the reliability of the working pH ranges from 3 to 9. The sensing surface was tested to detect SCC-Ag against its specific antibody; the detection limit was found to be 10 pM, and the sensitivity was in the range between 1 and 10 pM as calculated by 3σ. The specificity experiment was carried out using major proteins from human serum, such as albumin and globulin. SCC-Ag was shown to be selectively detected on the strontium oxide-modified IDE surface.

Publication

Investigating the Applicability of Several Fuzzy-Based Classifiers on Multi-Label Classification

( 2019-01-01)

Al-luwaici M.

;

Ahmad Kadri Junoh

;

Ahmad F.K.

: In the last few decades, fuzzy logic has been extensively used in several domains such as economy, decision making, logic and classification. In specific, fuzzy logic which is a powerful mathematical representation has shown a superior performance with uncertainty real-life applications comparing with other learning approaches. Many researchers utilized the concept of fuzzy logic in solving the traditional single label classification problems of both types: binary classification and multi-class classification. Unfortunately, veiy few researches have utilized fuzzy logic in a more general type of classification that is called Multi-Label Classification (MLC). Hence, this study aims to examine the applicability of fuzzy logic to be used with MLC through evaluating several fuzzy-based classifiers on five different multi-label datasets. The results revealed that the utilizing fuzzy-based classifiers on solving the problem of MLC is promising comparing with a wide range of MLC algorithms that belong to several learning approaches and strategies.

Publication

Wireless sensor network deployment based on machine learning for prolonging network lifetime and PDR

( 2019-01-01)

Noori A.

;

Bi Lynn O.

;

Ahmad H.

;

Badlishah Ahmad R.

;

Amir A.

;

Abd A.

;

Ibrahim M.K.

Sensor Deployment (SN) is one of the major challenges in wireless sensor network architecture. One of the most fundamental issues in wireless sensor deployment is to balance the objective to resolve network conflicts. This paper aims to find the Pareto front that maximizes the packet delivery ratio and minimizes sensor energy consumption for prolonging network lifetime. For this proposal, a hyper-heuristic framework for improving the performance of the metaheuristic (LMOJPSO) search optimization process by combining two different searching techniques was designed. The first optimization technique carried out its searches with the help of an extreme learning machine (ELM), whereas the second used a wireless sensor network simulator. In this paper, the proposed method is examined in given wireless sensor network test instances, and the evaluation of its performance is carried out using a WSN performance metric. The results indicate that the proposed model is superior to the non-dominated sorting genetic algorithm (NSGA-II).

Publication

Hydrodynamic Impact to the Cell Stress during Single Cell Recovery

( 2019-01-01)

Noor A.M.

;

Norali A.N.

;

Zakaria Z.

;

Noor A.M.

;

Hashim H.

Cell overstressed in single-cell recovery process leads to cell mortality during the isolation process. A glass capillaries micropipette can be useful as a tool for picking up cell based on the positive displacement picking up method. However, when a negative pressure applies to the micropipette glass for picking a cell, it produces hydrodynamic pressure to the cell medium. This pressure condition, which proportional to the stress of the cell during the recovery process. In this work, we present a numerical analysis of shear stress on cell cytoplasm. Parameters such as micropipette diameter size, micropipette tip distance to the target cell, and negative pressure impact to the cell are analyzed. As a result, shear stress of cell cyt oplasm increased by a short distance of cell to the micropipette tip during the initial picking up process. However, during the cell flowing inside the micropipette, the shear stress produced to the cell has no difference to the micropipette diameter. Therefore, this study could provide a benefit understanding of cell stress phenomena for many types of cells in single-cell recovery application by proper selection of micropipette diameter, suction pressure and the minimal cell distance to during the recovery process.

Publications 2019

Permanent URI for this collection

Browse

Browse

Browsing Publications 2019 by Issue Date

Results Per Page

Sort Options