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31,456 Article Results

Study the effect of thin film thickness on the optical features of (IR5 laser dye/CdSe nanoparticles) samples

10.12928/telkomnika.v17i6.13004
Mithaq M.; Kufa University Mehdy Al-Sultani
The linear optical features such as (transmittance T, absorbance A, the effective length 𝐿𝑒𝑓𝑓, absorption coefficient 𝛼 and refractive index 𝑛 ) for the thin films samples of (3x10-3 mol/l of (IR5) laser dye, 0.02 gm of (CdS) nanoparticles and 0.04 gm of pp polymer) had been studied at different values of film thickness in one time and at different number of Yb:GdVO4 laser pulses. The non-linear optical features in terms of transmittance difference Δ𝑇𝑝−𝑣, non-linear refractive index 𝑛2, non–linear phase shift Δ𝛷𝑜 non-linear absorption coefficient 𝛽 and minimum normalized transmittance 𝑇(𝑍) have been computed in relation to obtained normalized transmittance data from setup of Z-scan with open and closed apertures, calculated for (3x10-3 mol/l of (IR5) laser dye, 0.02 gm of (CdSe) nanoparticles and 0.04 gm of (pp) polymer) thin films at different values of film thickness at in one time and at different Yb:GdVO4 laser pulses. Thick films causes in deleting the non-linear effects generated by different layers. The (CdSe) nanoparticles leads to an absorption shifting of the wavelengths to lengthier wavelengths of red shift. So, this can be used in selecting the nanoparticles and medium with applicable exciting wavelengths. The film thickness and the laser pulses have the main effects in consolidating the Non-linear optical features.
Volume: 17
Issue: 6
Page: 2877-2884
Publish at: 2019-12-01

Streaming in-patient BPM data to the cloud with a real-time monitoring system

10.12928/telkomnika.v17i6.13263
Mohammed G.; Northern Technical University Ayoub , Mazin N.; Northern Technical University Farhan , Mohamme S.; Northern Technical University Jarjees
Monitoring the heart activities for old people or people with medical history (Arrhythmia or CHD) is targeted by most new medical technologies. This paper demonstrated an in-patient real-time monitoring system for heart rate estimation. A ratio of beats per minute (BPM) is continuously recorded, streamed and archived to the cloud via WeMos WiFi development board. This cost effective system is simply based on two sub-systems: BPM data acquisition through pulse sensor and WeMos-based communication systems. The streamed BPM data are saved instantaneously in Google drive as spreadsheets which can only be accessed by authorized persons wherever the internet service is available. Thus, the person in charge can remotely observe the patient’s status and do analytics for the archived data. A pilot study with eight subjects was carried out to validate the developed BPM tele-monitoring system. Encouraging results have been achieved.
Volume: 17
Issue: 6
Page: 3120-3125
Publish at: 2019-12-01

Parallelism in web services: design of parallel XML parser for web services

10.11591/ijeecs.v16.i3.pp1407-1415
Rohitkumar Rudrappa Wagdarikar , Sandhya P
A WS provides the communication between heterogeneous systems. While performing this operation, we need to focus on QoS of consumer, provider and registry directory. There will be some parameters like WS selection, prediction and rank these are parameters need to consider while QoS implementation in web services. While performing integration in web services we need to focus on QoS requirements regarding server and network performance. Performance of WS is related to locations i.e the network distance and the Internet connections between consumer and provider. There will be more QoS approach which works on consumers collected QoS data, based on this data system can predict the QoS of WS. Throughput and response time are the QoS of WS. In this paper, we have proposed parallel XML parser, by which we can parse UDDI, WSDL and SOAP XML files parallel by which it will improve the response time and throughput of WS.
Volume: 16
Issue: 3
Page: 1407-1415
Publish at: 2019-12-01

Neurodiversity awareness: Is Malaysia there yet?

10.11591/ijere.v8i4.20307
Aida A. Rahman , Woollard J.
Scientific research on dyslexia has taken place for the past 50 years during which time arguments on brain deficiency have created tensions between education and cognitive neuroscience researchers. However, clinical research on dyslexia through functional magnetic resonance imaging (fMRI) has finally revealed that a dyslexic’s brain works differently. The findings have finally brought in a new synergy between research in education and cognitive neuroscience and empirically supported the neurodiversity movement. Recently, neurodiversity has been used as a framework for specific learning difficulties (SpLD) justice and to support dyslexia in inclusive education. This qualitative study was conducted to understand the Malaysian mainstream primary school teachers’ beliefs about SpLD and the current framework for Malaysian literacy support programme. The data collection is through social media focus group discussion and individual instant messaging interviews with forty-one teachers. The findings reveal that the current programme is built on theories of remediation and that the teachers have exhibited good levels of understanding of remediation, but not yet understand neurodiversity. It makes recommendations with regard to teacher professional development.
Volume: 8
Issue: 4
Page: 676-685
Publish at: 2019-12-01

Optimizing PEMFC model parameters using ant lion optimizer and dragonfly algorithm: A comparative study

10.11591/ijece.v9i6.pp5295-5303
Zainuddin Mat Isa , Norkharziana Mohd Nayan , Mohd Hafiz Arshad , Nor Ashbahani Mohamad Kajaan
This paper introduced two optimization algorithms which are Ant Lion Optimizer (ALO) and Dragonfly Algorithm (DA) for extracting the Proton Exchange Membrane Fuel Cell (PEMFC) polarization curve parameters. The results produced by both algorithms are being compared to observe their performance. As a results, the ALO shows great performance compared to DA. Furthermore, these results also being compared with the results of the other reported metaheuristics algorithms. The ALO and DA presented competitive results.
Volume: 9
Issue: 6
Page: 5295-5303
Publish at: 2019-12-01

A review on software defined network security risks and challenges

10.12928/telkomnika.v17i6.13119
Tsehay Admassu; Aksum University Assegie , Pramod Sekharan; Aksum University Nair
Software defined network is an emerging networking architecture that separates the traditional integrated control logic and data forwarding functionality into different planes, namely the control plane and data forwarding plane. The data plane does and end to end data delivery. And the control plane does the actual network traffic forwarding and routing between different network segments. In software defined network the networking infrastructure layer where the entire networking device, such as switches and routers reside is connected with the separate controller layer with the help of standard called OpenFlow protocol. It is a standard protocol that allows different vendor devices like juniper switches, cisco switches and huawei switches to be connected to the controller. The centralization of the SDN controller made the network more flexible, manageable and dynamic, such as provisioning of bandwidth, dynamic scale out and scale in compared to the traditional communication network, however the centralized SDN controller is more vulnerable to security risk factors such as DDOS and flow rule poisoning attack. In this paper we will explore the architectures and principles of software defined network and security risks with the centralized SDN controller and possible ways to mitigate these risks.
Volume: 17
Issue: 6
Page: 3168-3174
Publish at: 2019-12-01

Performance analysis of high-k materials as stern layer in ion-sensitive field effect transistor using commercial TCAD

10.12928/telkomnika.v17i6.12852
Ahmed M.; Universiti Teknikal Malaysia Melaka (UTeM) Dinar , AS Mohd; Universiti Teknikal Malaysia Melaka (UTeM) Zain , F.; Universiti Teknikal Malaysia Melaka (UTeM) Salehuddin , Mowafak K.; Universiti Teknikal Malaysia Melaka (UTeM) Mohsen , Mothana L.; Universiti Teknikal Malaysia Melaka (UTeM) Attiah , M. K.; Universiti Teknikal Malaysia Melaka (UTeM) Abdulhameed
High-k materials as a STERN Layer for Ion-Sensitive-Field-Effect-Transistor (ISFET) have improved ISFET sensitivity and stability. These materials decrease leakage current and increase capacitance of the ISFET gate toward highest current sensitivity. So far, many high-k materials have been utilized for ISFET, yet they were examined individually, or using numerical solutions rather than using integrated TCAD environment. Exploiting TCAD environment leads to extract ISFET equivalent circuit parameters and performs full analysis for both device and circuit. In this study we introduce a comprehensive investigation of different high-k material, Tio2, Ta2O5, ZrO2, Al2O3, HfO2 and Si3N4 as well as normal silicon dioxide and their effects on ISFET sensitivity and stability. This was implemented by developing commercial Silvaco TCAD rather than expensive real fabrication. The results confirm that employing high-k materials in ISFET outperform normal silicon dioxide in terms of sensitivity and stability. Further analysis revealed that Titanium dioxide showed the highest sensitivity followed by two groups HfO2, Ta2O5 and ZrO2, Al2O3 respectively. Another notable exception of Si3N4 that is less than other materials, but still have higher sensitivity than normal silicon dioxide. We believe that this study opens new directions for further analysis and optimization prior to the real cost-ineffective fabrication.
Volume: 17
Issue: 6
Page: 2867-2876
Publish at: 2019-12-01

Predictive analytics of university student intake using supervised methods

10.11591/ijai.v8.i4.pp367-374
Muhammad Yunus Iqbal Basheer , Sofianita Mutalib , Nurzeatul Hamimah Abdul Hamid , Shuzlina Abdul-Rahman , Ariff Md Ab Malik
Predictive analytics extract important factors and patterns from historical data to predict future outcomes. This paper presents predictive analytics of university student intake using supervised methods. Every year, universities face a lot of academic offer rejection by the applicants. Hence, this research aims to predict student acceptance and rejection towards academic offer given by a university using supervised methods subject to past student intake data. To solve this problem, a lot of past studies had been reviewed starting from nineties era till now. From the analysis, two algorithms had been selected namely Decision Tree and k Nearest Neighbor. The dataset of past student intake was obtained with fifteen attributes, which are applicants’ gender, applicants studied stream during Sijil Peperiksaan Malaysia (SPM), university campuses, applicants’ hometown, disability, campus visit, course choice order in application form, applicant’s six SPM subjects result, orphan and status of acceptance. Several experiments were implemented to find the best model to predict the student’s offer acceptance by evaluating the model accuracy. Both models yield best accuracy at 66 percent with the selected attributes. This research gives a huge impact in selecting which applicants is suitable to be offered as well as adapting the university’s academic offering process in much intelligence way in the future.
Volume: 8
Issue: 4
Page: 367-374
Publish at: 2019-12-01

Clarification of the optimum silica nanofiller amount for electrical treeing resistance

10.12928/telkomnika.v17i6.10605
Z.; Sriwijaya University Nawawi , M. A. B.; Sriwijaya University Sidik , M. I.; Sriwijaya University Jambak , C. L. G.; Universiti Teknologi Malaysia Pavan Kumar , Aulia; Andalas University Aulia , M. H.; Universiti Teknologi Malaysia Ahmad , A. A.; Universiti Sains Malaysia Abd Jamil
This paper aims to clarify the optimum amount of fumed silica (SiO2) nanofiller in resisting the initiation and propagation of electrical treeing in silicone rubber (SiR). Unlike other works, SiR/SiO2 nanocomposites containing seven different weight percentages of SiO2 nanofiller were prepared for this purpose. To achieve the objective, the electrical tree characteristics of the SiR/SiO2 nanocomposites were investigated by comparing the tree initiation voltage, tree breakdown time, tree propagation length and tree growth rate with its equivalent unfilled SiR. Moreover, the structural and morphological analyses were conducted on the SiR/SiO2 nanocomposite samples. The results showed that the SiR, when added with an appropriate amount of SiO2 nanofiller, could result in an improved electrical tree resistance. It implies that the 5 wt% of silica is the optimum amount to achieve the optimal electrical tree resistance such that above 5 wt%, the tree resistance performance has been abruptly reduced, subjected to the agglomeration issue.
Volume: 17
Issue: 6
Page: 2903-2911
Publish at: 2019-12-01

A design of radial line slot array antennas using the specification of panel antennas

10.12928/telkomnika.v17i6.12679
Teddy; Universitas Islam Negeri Sultan Syarif Kasim Purnamirza , Muhammad; UIN Sultan Syarif Kasim Riau Ralibi , Imran M. Bin; Universiti Teknikal Malaysia Malaka Ibrahim , Rika; UIN Sultan Syarif Kasim Riau Susanti , Halim; UIN Sultan Syarif Kasim Mudia , Depriwana; UIN Sultan Syarif Kasim Riau Rahmi , Sutoyo; UIN Sultan Syarif Kasim Riau Sutoyo , Mulyono; UIN Sultan Syarif Kasim Riau Mulyono
RLSA antennas were suggested by several researches as Wi-Fi antennas in addition to panel antennas. Therefore, this paper researched the possibility of this suggestion. We used the size of an available in market 16 dBi panel antenna (225 mm2) as the size for our developed RLSA antenna. Based on this size, we developed 60 RLSA models using extreme beamsquint technique and simulated them. We then chose a best model with a best performance. The best model was then fabricated and measured. The simulation and measurement results show that the developed RLSA antenna has better performance compared to the 16 dBi panel antenna in term of gain (0.25 dB higher) and bandwidth (570 MHz wider). The RLSA antenna also tested as antenna for a Wi-Fi device and it showed good performance.
Volume: 17
Issue: 6
Page: 3066-3072
Publish at: 2019-12-01

Power loss reduction by arctic wolf optimization algorithm

10.11591/ijict.v8i3.pp111-116
Kanagasabai Lenin
This paper proposes Arctic Wolf optimization (AWO) algorithm to solve the optimal reactive power problem. Deeds of the Arctic wolf have been imitated to formulate the proposed algorithm. Arctic wolf also identified as the white wolf or polar wolf is a breed of gray wolf inhabitant from Melville Island to Ellesmere Island. It is average size, very smaller when compared to north western wolf, it possess whiter coloration, narrower braincase and big carnassials. Particle swarm optimization, Genetic algorithm has been used to improve the Exploration & Exploitation ability of the algorithm by utilizes flag vector & position, velocity update properties. Proposed Arctic Wolf optimization (AWO) algorithm has been tested in standard IEEE 30 bus test system and simulation results show the projected algorithms reduced the real power loss considerably.
Volume: 8
Issue: 3
Page: 111-116
Publish at: 2019-12-01

Modelling of scanning pulsed eddy current testing of normal and slanted surface cracks

10.11591/ijeecs.v16.i3.pp1297-1302
Faris Nafiah , Ali Sophian , Md Raisuddin Khan , Ilham Mukriz Zainal Abidin
Thanks to its wide bandwidth, pulsed eddy current (PEC) has attracted researchers of various backgrounds in the attempt to exploit its benefits in Non-destructive Testing (NDT). The ability of modelling PEC problems would be a precious tool in this attempt as it would help improve the understanding of the interaction between the transient magnetic field and the specimen, among others. In this work, a Finite Element Modelling (FEM) has been developed and experimental test data have been gathered for its validation. The investigated cases were simulated surface cracks of different sizes and angles. The study involved looking at time-domain PEC signals at different spatial distances from the cracks’ faces, which would particularly be useful for modelling scanning PEC probes. The obtained results show a good agreement between the FEM and experiment, demonstrating that the modelling technique can be used with confidence for solving similar problems.
Volume: 16
Issue: 3
Page: 1297-1302
Publish at: 2019-12-01

Characterization of silicon nanowire transistor

10.12928/telkomnika.v17i6.13084
Hani Taha; Universiti Malaysia Pahang Al Ariqi , Waheb A.; Universiti Malaysia Pahang Jabbar , Yasir; Ishik University Hashim , Hadi Bin; Universiti Malaysia Pahang Manap
This paper analyses the temperature sensitivity of Silicon Nanowire Transistor (SiNWT) depends on the diameter (D.ch) of channel. In addition, it also investigates the possibility of utilizing SiNWT as a Nano- temperature sensor. The MuGFET simulation tool has been utilized to conduct a comprehensive simulation to evaluate both electrical and temperature characteristics of SiNWT. Current-voltage characteristics with different values of temperature and with a varying diameter of the Nano wire channel (D.ch = 80, 40, 20 and 10 nm), were simulated. Diode operating mode connection of the transistor is suggested for measuring the temperature sensitivity of SiNWT. As simulation results demonstrated, the best temperature sensitivity was occurred at lower temperature with increasing the channel diameter. We also illustrate the impact of varying temperature and channel diameter on electrical characteristics of SiNWT including, Subthreshold Swing (SS), Threshold voltage (V.th), and Drain-induced barrier lowering (DIBL), which were proportionally increased with the operating temperature.
Volume: 17
Issue: 6
Page: 2860-2866
Publish at: 2019-12-01

The sensorless control system for controlling the speed of direct current motor

10.11591/ijeecs.v16.i3.pp1171-1178
Khac-Khiem Nguyen , Trong-Thang Nguyen
This research aims to propose an algorithm for controlling the speed of the Direct Current (DC) motor in the absence of the sensor of speed. Based on the initial mathematical model of DC motor, the authors build the dynamic state equation of DC motor, and then build an estimation model to determine the speed of the DC motor without a sensor. The advantages of the proposed method are demonstrated through the closed-loop control model using the PID controller. In order for the results to be objective, we assume that the parameters of the DC motor in the estimation model are not known correctly. The results show that the quality of control in the absence of a sensor is equivalent to the case with the sensor.
Volume: 16
Issue: 3
Page: 1171-1178
Publish at: 2019-12-01

Electrode size influence on static and dynamic single cell lead-acid battery

10.12928/telkomnika.v17i6.11913
Muhammad; University of Brawijaya Ghufron , Kurriawan Budi; Universitas Kanjuruhan Malang Pranata , Istiroyah; University of Brawijaya Istiroyah , Masruroh; University of Brawijaya Masruroh , Cholisina Anik; University of Brawijaya Perwita , Ahmad A.; University of Brawijaya Amirullah , Nur; University of Brawijaya Khairati , Yofinda Eka; University of Brawijaya Setiawan , Fakhrusy R.; University of Brawijaya Ramadhan
Renewable energy such as solar energy, waves and wind require batteries as a storage of electrical energy which still has constraints related to voltage, capacity, and energy efficiency. This experiment aims to determine the effect of electrode size on lead-acid dynamic and static battery capacity and energy efficiency. Dynamic and static single cell lead-acid batteries consist of three different electrode sizes, 13.5x7.5 cm2 (A1); 22.5x7.5 cm2 (A2) and 32.5x7.5 cm2 (A3) have been developed. Continuous and simultaneous charge-discharge test using turnigy accucell-6 50 w and chargemaster 2.02 software as graphic programming. Based on experiments, dynamic batteries perform better than static batteries with a difference in capacity of up to 48% and differences in energy efficiency up to 17%. The best performance is obtained on A3 dynamic batteries with an average capacity capacity of 10357 mAh and an average energy efficiency of 81%.
Volume: 17
Issue: 6
Page: 2919-2925
Publish at: 2019-12-01
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