UniMAP RIS :: Browsing Publications 2017 by Title

Publication

3D mapping of breast surface using digital fringe projection

( 2017-01-01)

Vairavan R.

;

Retnasamy V.

;

Mohamad Shahimin M.

;

Sauli Z.

;

Leng L.

;

Wan Norhaimi W.

;

Marimuthu R.

;

Abdullah O.

;

Kirtsaeng S.

Optical sensing technique has inherited non-contact nature for generating 3D surface mapping where its application ranges from MEMS component characterization, corrosion analysis, and vibration analysis. In particular, the digital fringe projection is utilized for 3D mapping of objects through the illumination of structured light for medical application extending from oral dental measurements, lower back deformation analysis, monitoring of scoliosis and 3D face reconstruction for biometric identification. However, the usage of digital fringe projection for 3D mapping of human breast is very minimal. Thus, this paper addresses the application of digital fringe projection for 3D mapping of breast surface based on total non-contact nature. In this work, phase shift method is utilized to perform the 3D mapping. The phase shifted fringe pattern are displayed through a digital projector onto the breast surface, and the distorted fringe patterns are captured by a CCD camera. A phase map is produced, and phase unwrapping was executed to obtain the 3D surface mapping of the breast. The surface height profile from 3D fringe projection was compared with the surface height measured by a direct method using electronic digital vernier caliper. Preliminary results showed the feasibility of digital fringe projection in providing a 3D mapping of breast and its application could be further extended for breast carcinoma detection.

Publication

60 GHz Milimeter-Wave Antennas for Point-to-Point 5G Communication System

( 2017-12-11)

Aishah A.

;

Beson M.

;

Azemi S.

;

Junid S.

In this paper microstrip patch antenna for millimeter-wave is proposed. Evolution of shape microstrip antenna are designed which is from rectangular antenna to triangle antenna and changed to triangle with slot. The proposed antenna configuration achieved for covering 5G wireless system. The lowest return loss of the antenna is -29.23dB which is triangle with slot and the maximum gain obtained is 8 db at the 61.93 GHz for the triangle antenna. This antenna are suitable for the 5G wireless application for short range and high rate communication system.

Publication

A bidirectional flyback converter with cross-coupled non-dissipative snubber circuits

( 2017-12-14)

Mukhtar N.

;

Dah-Chuan Lu D.

This paper proposed a novel isolated bidirectional flyback converter integrated with two non-dissipative LC snubbers. In the proposed topology, the main flyback transformer and the LC snubbers are crossed-coupled to reduce current circulation and recycle the leakage energy. The proposed isolated bidirectional flyback converter can step-up the voltage of the battery (Vbat = 12V) to a high voltage side (VHV = 200V) for the load demand and vice versa. The main goal of this paper is to demonstrate the performances of this topology to achieve high voltage gain with less switching losses and reduce components stresses. The circuit analysis conferred in detail for Continuous Conduction Mode (CCM). Lastly, a laboratory prototype constructed to compare with simulation result.

Publication

A brief review of the EMF interaction: Metal implantation and biological tissues

( 2017-01-01)

Mohd Hafizuddin Mat

;

Muzammil Jusoh

;

Hasliza A Rahim @ Samsuddin

;

Mohd Irwan Yusoff

In analyzing the near field for a device, such as a mobile phone used in close proximity to tissues, it is difficult to predict the electromagnetic field (EMF) and other characteristics, since certain parts of the mobile phone scatter and reflect the EMF. Moreover, the absorption of EMF in the lossy tissues mitigates as the radio frequency (RF) energy is absorbed by the tissue. In order to minimize the heating effect on human tissue caused by this absorption of RF energy by the human body, all communications equipment (CE) must comply with the guidelines that established the maximum power output of devices. Though RF emissions from CE are carefully measured, the probability exists that the RF characteristics are reformed somewhat when tissue that illuminated by RF energy embedded with implant, thereby increasing the specific absorption rate (SAR). The SAR is the fundamental metric for specifying RF absorption by tissues and it can be calculated at any location in the tissue.

Publication

A cause of communication failure in managing Industrialized Building System (IBS) projects: A perspective view from project managers

( 2018-01-01)

Pozin M.A.A.

;

Nawi M.N.M.

;

Lee A.

;

Yaakob M.

;

Hanafi M.H.

An effective communication process is an important element in distributing information to various project teams. The previous study demonstrates the importance of communication in the project management process in order to encourage project delivery processes successfully. Unfortunately, the issue of communication still dominates Industrialization Building System (IBS) because the project development process are still based on traditional methods. This research aims to explore the cause of communication challenges between construction players in managing IBS projects. The research methodology implemented for this paper was a semi-structured interview approach used to investigate the communication problem. Five experienced project managers were chosen from across the industry. The findings of this study are valuable for improving the communication level of project teams, which will indirectly increase the level of the IBS project delivery process and strengthen team integration on IBS projects in Malaysia.

Publication

A Compact Antenna Design for Fifth Generation Wireless Communication System

( 2017-12-11)

Daud N.N.

;

Mohd Nizam Osman

;

Kamarudin M.R.

;

Kram A.R.

;

Azizan M.M.

This paper proposes a compact antenna design for wireless communication system that can operate at dual band frequencies which are 24.25 GHz and 38 GHz. The antenna with an overall size of 6.3 mm X 6.0 mm is printed on RogersRT5880 type of substrate with a thickness of 0.787 mm. The simulated reflection coefficient result is < -10 dB for both frequencies which makes it suitable for 5G applications. The proposed antenna has a stable gain value of 7.23 dBi at 24.25 GHz and 3.69 dBi at 38 GHz. All the simulation result was performed by using CST Microwave Studio Software. The result shows the feasibility of this antenna to be applied for future 5G application.

Publication

A comparative study of Averrhoabilimbi extraction method

( 2017-09-26)

Zulhaimi H.

;

Rosli I.

;

Kasim K.

;

Akmal H.

;

Nuradibah M.

;

Sam S.

In recent year, bioactive compound in plant has become a limelight in the food and pharmaceutical market, leading to research interest to implement effective technologies for extracting bioactive substance. Therefore, this study is focusing on extraction of Averrhoabilimbi by different extraction technique namely, maceration and ultrasound-assisted extraction. Fewplant partsof Averrhoabilimbiweretaken as extraction samples which are fruits, leaves and twig. Different solvents such as methanol, ethanol and distilled water were utilized in the process. Fruit extractsresult in highest extraction yield compared to other plant parts. Ethanol and distilled water have significant role compared to methanol in all parts and both extraction technique. The result also shows that ultrasound-assisted extraction gave comparable result with maceration. Besides, the shorter period on extraction process gives useful in term of implementation to industries.

Publication

A comparative study of thermal performance on commercialized LED bulb on the luminaire geometry

( 2017-01-01)

Leng L.

;

Retnasamy V.

;

Mohamad Shahimin M.

;

Sauli Z.

;

Taniselass S.

;

Bin Ab Aziz M.

;

Vairavan R.

;

Kirtsaeng S.

The demand for the high Lumens output on the commercialized Light-emitting diode, LED bulb has resulted in the increase of operating power and generation of heat. A study on the thermal performance of commercialized LED bulbs was done by using Elmer finite element simulation method. The variation approach was limited to input power (2 Watt- 10 Watt) and the heat performance was compared. The result gives a comparison of the variation of the model and the heat distribution. Analysis showed that the input power and bulb geometry give direct effect on the junction temperature.

Publication

A Computational Study on the Magnetic Resonance Coupling Technique for Wireless Power Transfer

( 2017-12-11)

Zakaria N.A.

;

Jusoh M.

;

Ghazali N.H.

;

Yasin M.N.

;

Sabapathy T.

;

Osman M.N.

;

Ahmad N.

;

Zakaria M.Z.

Non-radiative wireless power transfer (WPT) system using magnetic resonance coupling (MRC) technique has recently been a topic of discussion among researchers. This technique discussed more scenarios in mid-range field of wireless power transmission reflected to the distance and efficiency. The WPT system efficiency varies when the coupling distance between two coils involved changes. This could lead to a decisive issue of high efficient power transfer. This paper presents case studies on the relationship of operating range with the efficiency of the MRC technique. Demonstrative WPT system operates at two different frequencies are projected in order to verify performance. The resonance frequencies used are less than 100MHz within range of 10cm to 20cm.

Publication

A direct detection of human papillomavirus 16 genomic DNA using gold nanoprobes

( 2017-01-01)

Azizah N.

;

Hashim U.

;

Gopinath S.C.B.

;

Nadzirah S.

Nanoparticles have been investigated as flagging tests for the sensitive DNA recognition that can be utilized as a part of field applications to defeat restrictions. Gold nanoparticles (AuNPs) have been widely utilized due to its optical property and capacity to get functionalized with a mixed bag of biomolecules. This study exhibits the utilization of AuNPs functionalized with single-stranded oligonucleotide (AuNP-oligo test) for fast the identification of Human Papillomavirus (HPV). This test is displayed on interdigitated electrode sensor and supported by colorimetric assay. DNA conjugated AuNP has optical property that can be controlled for the applications in diagnostics. With its identification abilities, this methodology incorporates minimal effort, strong reagents and basic identification of HPV.

Publication

A dual band antenna design for future millimeter wave wireless communication at 24.25 GHz and 38 GHz

( 2017-10-10)

Daud N.N.

;

Muzammil Jusoh

;

Hasliza A Rahim @ Samsuddin

;

Rozmie Razif Othman

;

Sapabathy T.

;

Mohd Nizam Osman

;

Yassin M.N.M.

;

Kamarudin M.R.

This paper proposes a dual band antenna for future millimeter wave wireless communication. The performance of this dual band antenna is analyzed in term of reflection coefficient when some of the length of the patch antenna was adjustable, overall gain and total efficiency for both frequencies respectively. The size of this presented patch antenna is 4.9 × 7.6 mm2. The dual band antenna was fabricated on a RTRogers5880 with a dielectric constant of £=2.2 and thickness of the substrate is 0.127 mm. The simulated result obtained the reflection coefficient as a requirement of the antenna which is not less than -10 dB for 24.25 GHz and 38 GHz that capable to cover 5G applications. The proposed antenna has achieved a maximum gain up to 5.5 dBi and 4.5 dBi at desired frequencies respectively. All design and simulation are carried out using CST Microwave Studio software. The proposed antenna design could be suitable to be applied as a device to the 5G wireless system.

Publication

A highly efficient immobilized ZnO/Zn photoanode for degradation of azo dye Reactive Green 19 in a photocatalytic fuel cell

( 2017-01-01)

Lee S.L.

;

Ho L.N.

;

Ong S.A.

;

Wong Y.S.

;

Voon C.H.

;

Khalik W.F.

;

Yusoff N.A.

;

Nordin N.

Photocatalytic fuel cell (PFC) is a potential wastewater treatment technology that can generate electricity from the conversion of chemical energy of organic pollutants. An immobilized ZnO/Zn fabricated by sonication and heat attachment method was applied as the photoanode and Pt/C plate was used as the cathode of the PFC in this study. Factors that affect the decolorization efficiency and electricity generation of the PFC such as different initial dye concentrations and pH were investigated. Results revealed that the degradation of Reactive Green 19 (RG19) was enhanced in a closed circuit PFC compared with that of a opened circuit PFC. Almost 100% decolorization could be achieved in 8 h when 250 mL of 30 mg L−1 of RG19 was treated in a PFC without any supporting electrolyte. The highest short circuit current of 0.0427 mA cm−2 and maximum power density of 0.0102 mW cm−2 was obtained by PFC using 30 mg L−1 of RG19. The correlation between dye degradation, conductivity and voltage output were also investigated and discussed.

Publication

A hybrid methodology for the mahalanobis-taguchi system using random binary search-based feature selection

( 2017-06-01)

Muhamad W.Z.A.W.

;

Jamaludin K.R.

;

Yahya Z.R.

;

Ramlie F.

The Mahalanobis-Taguchi system (MTS) is a relatively new statistical methodology combining various mathematical concepts and is used in the field of diagnosis and classification in multidimensional systems. MTS is a very efficient method and has already been applied to a wide range of disciplines. However, its feature selection phase (optimization stage), which uses experimental designs (orthogonal array, OA), is susceptible to improvement. In MTS, selection of important features or variables to improve classification accuracy is done using signal-to- noise (S/N) ratios and OA. OA has been noted for limitations in handling a large number of variables. Therefore, in this research, we propose the use of a random binary search (RBS) algorithm incorporated within MTS for optimizing the procedure for selecting the most useful variables. Ensemble is a powerful technique to achieve improvement in the accuracy of predictive models, whereby individual methods, which are not consistently the best performers in different problems and datasets, are brought together to provide predictions which are more accurate than those made by individual methods.

Publication

A method to press powder at 6000 ton using small amount of explosive

( 2017-12-04)

Ahmad Humaizi Hilmi

;

Nor Azmaliana Azmi

;

Ariffin Ismail

Large die hydraulic press forces are one of the key instruments in making jumbo planes. The machine can produce aircraft components such as wing spars, landing gear supports and armor plates. Superpower nations such as USA, Russia, Germany, Japan, Korea and China have large die hydraulic press which can press 50,000 tons. In Malaysia, heavy-duty press is available from companies such as Proton that builds chassis for cars. However, that heavy-duty press is not able to produce better bulkhead for engines, fuselage, and wings of an aircraft. This paper presents the design of an apparatus that uses 50 grams of commercial grade explosives to produce 6000 tons of compaction. This is a first step towards producing larger scale apparatus that can produce 50,000-ton press. The design was done using AUTODYN blast simulation software. According to the results, the maximum load the apparatus can withstand was 6000 tons which was contributed by 50 grams of commercial explosive(Emulex). Explosive size larger than 50 grams will lead to catastrophic failure. Fabrication of the apparatus was completed. However, testing of the apparatus is not presented in this article.

Publication

A methodology of nearest neighbor: Design and comparison of biometric image database

( 2017-01-06)

Haryati Jaafar

;

Nordiana Mukahar

;

Dzati Athiar Ramli

The nearest neighbor (NN) is a non-parametric classifier and has been widely used for pattern classification. Nevertheless, there are some problems encountered that leads to the poor performance of the NN i.e. the samples distribution, weighting issues and computational time for large databases. Hence, various classifiers i.e. k Nearest Neighbor (kNN), k Nearest Centroid Neighborhood (kNCN), Fuzzy k Nearest Neighbor (FkNN), Fuzzy-Based k Nearest Centroid Neighbor (FkNCN) and Improved Fuzzy-Based k Nearest Centroid Neighbor (IFkNCN) were proposed to improve the performance of the NN. This paper presents a review of aforementioned classifiers including the taxonomy, toward the implementation of classifiers in biometric image database. Two databases i.e. finger print and finger vein have been employed and the performance of classifiers were compared in term of processing time and classification accuracy. The results show that the IFkNCN classifier owns the best accuracies to the kNN, kNCN FkNN and FkNCN with 97.66% and 96.74% for fingerprint and finger vein databases, respectively.

Publication

A modified antipodal vivaldi antenna (AVA) with elliptical slotting edge (ESE) for ultra-wideband (UWB) applications

( 2017-11-20)

Nornikman H.

;

Abdulmalek M.

;

Ahmad B.H.

;

Al-Khatib O.

;

Aziz M.Z.A.A.

;

Hasliza A Rahim @ Samsuddin

;

Soon Y.Y.

;

Muslimah M.S.

;

Syazwany R.

;

Salimi H.I.

;

Amirul M.Y.

;

Azizi M.S.N.

As the demand of UWB system increases nowadays, several types of hybrid technique on antenna design are studied, modified, and proposed for UWB applications. In this work, an enhanced performance of modified antipodal Vivaldi antenna (AVA) for targeting ultrawideband (UWB) frequency range between 2.17 GHz and 10.6 GHz has been proposed. This proposed UWB antenna is using FR-4 substrate with dielectric constant, εr = 4.4 and the electrical conductivity tangent loss, tanΔ = 0.019. This antenna design is based on the modified from the dual exponential tapered slot antenna (DETSA) with varying of the exponential flares design for obtain the best return loss of the antenna within the frequency bandwidth of the UWB. It has two exponential flares that follow the characteristic of exponential curve. Next, an elliptical slotting edge (ESE) with fixed horizontal radius and varied vertical radius is implemented to the antenna which effectively increases the performance of the antenna at lower frequencies. These modifications are done without changing the antenna size, which is 70 mm × 90 mm in dimension, which is approximately 0.5λ × 0.6λ, where λ is the wavelength of 2 GHz. The effects of the parameters of the antenna characteristic are also studied. In this case, the parametric study on varying distance between elliptical slots, Ks. It shows that, the higher value of Ks will effect to shift to the resonant frequency and increase the return loss of the antenna. At 9.104 GHz of resonant frequencies, it shows of the best return loss of 48.809 dB. Rather than that, the side lobe levels of the radiation pattern of the antenna are reduced in the lower frequencies.

Publication

A multilayered acoustic signal generator for low power energy harvesting

( 2017-10-10)

Awal M.R.

;

Muzammil Jusoh

;

Hasliza A Rahim @ Samsuddin

;

Thennarasan Sabapathy

;

Mohamed Nasrun Osman

;

Mohd Ilman Jais

;

Kamarudin M.R.

This paper presents the design and analysis of a multilayer cantilever to harvest vibration energy by generating acoustic signal. To do so, a five layer configuration is used to design the cantilever. Lead Zirconate Titanate (PZT-8), Stainless Steel 405 Annealed, Aluminum and Zinc Oxide are used to develop the layers. Water is used as the medium to analyze the sound propagation pattern. Sound Pressure Level, displacements and electric potential of the cantilever are analyzed along with other parameters. From the results, it is evident that, the proposed cantilever can propagate sound within a range of 78.7 dB to 73.4 dB in a 50 mm spherical distance.

Publication

A needle-like Cu2CdSnS4 alloy nanostructure-based integrated electrochemical biosensor for detecting the DNA of Dengue serotype 2

( 2017-07-01)

Odeh A.A.

;

Al-Douri Y.

;

Voon C.H.

;

Mat Ayub R.

;

Gopinath S.C.B.

;

Odeh R.A.

;

Ameri M.

;

Bouhemadou A.

The authors describe an integrated biosensor for amperometric DNA detection of Dengue virus in real time. Cu2CdSnS4 (CCTS) quaternary alloy nanostructures were successfully synthesized, deposited on an oxygen-etched silicon substrate (O2/Si) via spin coating, and annealed at 400 °C. The nanostructures were investigated by using UV-vis spectroscopy, X-ray diffraction, atomic force microscopy and scanning electron microscopy. Interdigitated electrodes were fabricated using silver as a metal contact deposited on the CCTS/O2/Si substrate using a thermal evaporator vacuum coater and a hard mask. The quaternary alloy acts as a support for immobilization of a Dengue-specific DNA probe that is employed as the recognition element. Single-stranded DNA in concentrations from 100 f. to 10 nM were successfully recognized via amperometry, typically at a working voltage of 1.5 V. The lower detection limit is 17 nM. Sensitivity is found to be 24.2 μA nM−1 cm−2. The biosensor is inexpensive, fast, highly sensitive, and has low power consumption.

Publication

A novel of an optimal power received in outdoor optical wireless access networks

( 2017-01-01)

Anis A.A.

;

Rahman A.K.

;

Rashidi C.B.M.

;

Aljunid S.A.

Optical wireless communication systems are gaining popularity because of its benefits and advantages over conventional radio frequency (RF) communication systems. This paper presents the analysis of optical wireless communication system based on effect of various bit rates on the power received and bit error rate (BER) on the power received. From the mathematical analysis, optical wireless communication system with bit rate of 155 Mbps is proven to be the most suited to improve the performance of the system regarding attenuation effect on the link compared to bit rate of 622 Mbps, 1.5 Gbps, and 2.5 Gbps, respectively. It increased the system efficiency by 17%, 14% and 10% as compared to the three other bit rates in the studies of BER effects on power received. In addition, the plot between distance versus power received, bit rate of 155 Mbps had shown superior performance as it improves the link by 28% and 2% compared to 622 Mbps and 2.5 Gbps, where it is reliable for future optical wireless usage.

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Publication

A review and survey of radio resource management techniques in LTE-A network: Challenges and perspectives

( 2017-01-01)

Ben Abdelmula H.S.

;

Warip M.N.M.

;

Ahmad R.B.

LTE-Advanced (LTE-A) is an important aspect of 4G mobile network standard in which comply with the IMTAdvanced requirements. It has ability to increase the transmission bandwidths up to 100 MHz and it can transmit with peak data rates up to 1 Gb/s and 500 Mb/s, downlink and uplink respectively. There are many techniques which use to address the challenges that appear when designing and deploying the Long Term Evolution- Advanced (LTE-A) network. The first classify of these techniques is the radio resource management (RRM) techniques which is designed for controlling the interference, radio resource utilization and QoS. Second classify, scheduling techniques aim to achieve the system performance by increasing the network spectral efficiency and fairness. Third classify, interference management techniques are used to eliminate and overcome the interference issues which affect on the system throughput. Fourth classify, mobility management techniques help the system with low service interruption probability. This paper focuses on the study of RRM schemes that help the users to get the efficient spectrum to satisfy their QoS requirements and improve the overall system performance in terms of complexity, interference mitigation, spectral efficiency and fairness. This paper also provides the taxonomy of RRM techniques in femtocell along with the extends and the limitations of each technique.

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