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31,456 Article Results

Differential input range driver for SAR ADC measurement setup

10.11591/ijeecs.v17.i2.pp750-758
Siti Idzura Yusuf , Suhaidi Shafie , Hasmayadi Abdul Majid , Izhal Abdul Halin
Differential successive approximation register (SAR) of analog to digital converter (ADC) requires two balancing input signals that have same amplitude with 180⁰ out of phase. Otherwise, it performs inaccurately and degrades the performance during ADC testing procedure. Therefore, an implementation of AD8139 chip single to differential amplifier was chosen as an ADC driver to generate sufficient differential output for the ADC. The chip was placed on a printed circuit board (PCB) to test the functionality as well as the performance of static and dynamic SAR ADC. The result shows that the single-ended input transform into differential voltage outputs. The amplitudes for the amplifier remain equal and is 180° out of phase for DC and AC voltage input signal. Besides, the fabricated 0.18µm CMOS technology of differential 10-bit SAR ADC is capable of digitising full code digital output and perform 9.5-bit effective number of bit (ENOB) from analog input driving by the ADC driver.
Volume: 17
Issue: 2
Page: 750-758
Publish at: 2020-02-01

Cloud computing based load balancing algorithm for erlang concurrent traffic

10.11591/ijeecs.v17.i2.pp1109-1116
Chanintorn Jittawiriyanukoon
The distribution of scheduler from user inquiries in the clouds is complex. In keeping up with the cloud computing environment and the inquirers, the clouds meet with some problematic load balancing complications as an improving load balancing tool induces the rigorous efficiency of the cloud based website’s user access. Overloaded or underloaded conditions originate processing catastrophe regarding the prolonged execution time, bandwidth hog, malfunction, and etc. Besides, to manipulate Erlang concurrent tasks is another skyward situation. Hence, the load balancing is obliged to exhaust all mentioned conditions. The proposed load balancing algorithm for Erlang concurrent tasks (those are and could also be autonomous and unstable.) on VMware workstations is introduced.  There are several load patterns within the clouds corresponding to CPU’s load (utilization), memory load (queue size), link capacity load (bandwidth), and so on. The proposed load balancing is to spot underloaded and overloaded conditions then stabilizes the weight amidst computing nodes. There are countless load balancing approaches in the cloud environment to examine performance parameters. A short outline of corresponding performance metrics in the review and their findings are presented. To investigate the fit efficiency of the proposed algorithm, the simulation is applied then results based on the proposed method are compared to the existing ones. The outcomes settle the weight balancing, outperform others when executing Erlang traffic, and are catered in the context.
Volume: 17
Issue: 2
Page: 1109-1116
Publish at: 2020-02-01

Modified e-slotted patch antenna for WLAN/Wi-Max satellite applications

10.12928/telkomnika.v18i1.12959
Akanksha; Bundelkhand University Gupta , D. K.; Bundelkhand Institute of Engineering and Technology Srivastava , J. P.; Netaji Subhash institute of Technology Saini
A low profile modified e-slotted microstrip antenna is proposed for multiple wireless communication applications. The performance of antenna is measured in terms of return loss, current distribution. The effect of variation of height of substrate on antenna impedance bandwidth is also studied. The antenna with overall size 30×50×.8m.m.3 resonates at eight frequencies which covers some important applications like GPS, wireless local area network (WLAN), worldwide interoperability for microwave access (WiMax), Satellite communication etc. The proposed antenna structure offers great advantages due to compact size, simple structure and multiple applications. The multi band antenna was designed and optimized using ansoft HFSS v13 simulator. The simulated result is good agreement with measured result.
Volume: 18
Issue: 1
Page: 258-263
Publish at: 2020-02-01

Type 1 versus type 2 fuzzy logic speed controllers for brushless dc motors

10.11591/ijece.v10i1.pp265-274
Hayder Yousif Abed , Abdulrahim Thiab Humod , Amjad J. Humaidi
This work presented two fuzzy logic (FL) schemes for speed-controlled brushless DC motors. The first controller is a Type 1 FL controller (T1FLC), whereas the second controller is an interval Type 2 FL controller (IT2FLC). The two proposed controllers were compared in terms of system dynamics and performance. For a fair comparison, the same type and number of membership functions were used for both controllers. The effectiveness of the structures of the two FL controllers was verified through simulation in MATLAB/SIMULINK environment. Simulation result showed that IT2FLC exhibited better performance than T1FLC.
Volume: 10
Issue: 1
Page: 265-274
Publish at: 2020-02-01

Buck converter controlled with ZAD and FPIC for DC-DC signal regulation

10.12928/telkomnika.v18i1.14108
Fredy E.; Universidad Nacional de Colombia Hoyos Velasco , Yeison Alberto; Universidad Católica de Manizales Garcés Gómez , John E.; Universidad Nacional de Colombia Candelo-Becerra
This paper presents the performance of a fixed-point induction control (FPIC) technique working in conjunction with the non-linear control technique called zero average dynamics (ZAD) to control chaos in a buck converter. The control technique consists of a sliding surface in which the error tends to zero at each sampling period. A switch is controlled by using centered pulse width modulation (CPWM) control signal. The converter controlled with ZAD-FPIC has been simulated in Matlab and implemented using rapid control prototyping (RCP) in a DSP to make comparisons between simulation and experimental tests. To perform this comparison, some variations in the control parameter and the voltage reference are made in order to evaluate the performance of the system. Results are obtained with errors lower than 1 % which demonstrates the good performance of the control techniques.
Volume: 18
Issue: 1
Page: 365-375
Publish at: 2020-02-01

Power factor improvement on LED lamp driver using BIFRED converter

10.12928/telkomnika.v18i1.13160
Moh. Zaenal; Politeknik Elektronika Negeri Surabaya Efendi , Farid; Politeknik Elektronika Negeri Surabaya PENS Campus Dwi Murdianto , Fito; Politeknik Elektronika Negeri Surabaya PENS Campus Ardli Fitri , Luluk; Politeknik Elektronika Negeri Surabaya PENS Campus Badriyah
This paper presents the implementation of a power converter to improve power factor for LED lamp driver. The power converter which used in this system is the integration of boost and flyback converter (boost integrated flyback rectifier energy storage DC-DC/BIFRED). The boost converter as power factor correction (PFC) works on discontinuous conduction mode (DCM) operation to make the resistive converter. Thus, when a rectifier circuit supplies a resistive load, the load current that flows back to the source will have the same waveform as the voltage and it makes the power factor value next to 1 (unity). According to experiment results, the BIFRED converter as LED lamp driver can improve power factor from 0.84 to become 0.98 and this driver circuit also meets the line-current harmonic limits set by IEC61000-3-2 class C.
Volume: 18
Issue: 1
Page: 571-578
Publish at: 2020-02-01

Applying convolutional neural networks for limited-memory application

10.12928/telkomnika.v19i1.16232
Xuan-Kien; Ho Chi Minh City University of Transport Dang , Huynh-Nhu; Ba Ria-Vung Tau College of Technology Truong , Viet-Chinh; Ho Chi Minh City University of Transport Nguyen , Thi-Duyen-Anh; Ho Chi Minh University of Transport Pham
Currently, convolutional neural networks (CNN) are considered as the most effective tool in image diagnosis and processing techniques. In this paper, we studied and applied the modified SSDLite_MobileNetV2 and proposed a solution to always maintain the boundary of the total memory capacity in the following robust bound and applied on the bridge navigational watch & alarm system (BNWAS). The hardware was designed based on raspberry Pi-3, an embedded single board computer with CPU smartphone level, limited RAM without CUDA GPU. Experimental results showed that the deep learning model on an embedded single board computer brings us high effectiveness in application.
Volume: 19
Issue: 1
Page: 244-251
Publish at: 2020-02-01

Stepper motor movement design based on FPGA

10.11591/ijece.v10i1.pp151-159
Freddy Artadima Silaban , Setiyo Budiyanto , Wahyu Kusuma Raharja
A stepper motor is an electro mechanical device that can convert electrical pulses to the axis of movement. The finding problem  in the movement of a stepper motor is  cannot respond to the clock signal directly because the motor windings require a clock (sequence) in the correct order. If the control signal given is not correct, the motor is not moving according to the specified precision. To answer these problems, it is necessary to move the stepper motor with a clock signal that works in real time. The research method is done by designing and testing the stepper motor movement in full stepp and half step with the direction of Clock Wise (CW) and Counter Clock Wise (CCW) movement. These are simulated by using FPGA Isim and implementation using a stepper motor. The results of several experiments have been carried out the stepper motor movement degree according to the input value entered,responding timely movement, and the direction of movement stepper motor.
Volume: 10
Issue: 1
Page: 151-159
Publish at: 2020-02-01

Optimal distribution network configuration using improved backtracking search algorithm

10.12928/telkomnika.v19i1.16773
Thuan Thanh; Industrial University of Ho Chi Minh City Nguyen
Optimal network configuration is one of the effective approaches for power loss reduction of the distribution network. This paper shows a network reconfiguration method using improved backtracking search algorithm (IBSA). Wherein, IBSA is improved in the process of generating randomly the initialization population. The network reconfiguration method based on IBSA is used to find the optimal network configuration for the 33-node and 69-node systems. The results are compared to the original backtracking search algorithm (BSA), particle swarm optimization (PSO), firefly algorithm (FA) and previous approaches. From the compared results, IBSA can determine the optimal network configuration with higher success rate than BSA, PSO, FA and lower power loss than other previous approaches. As a result, IBSA is an effective approach for finding the optimal network configuration.
Volume: 19
Issue: 1
Page: 301-309
Publish at: 2020-02-01

Smart health monitoring system using IoT based smart fitness mirror

10.12928/telkomnika.v18i1.12434
Amgad; Asia Pacific University of Technology & Innovation Muneer , Suliman Mohamed; Prince Sultan University Fati , Saddam; Asia Pacific University of Technology & Innovation Fuddah
The smart fitness mirror proposed in this researchaims to provide the users with a platform to monitor their health and fitness status on a daily basis. The system employs a number of sensors to monitor the body mass index (BMI) and amount of body fat present in the user’s body. A weight scale consisting of four load sensors has been implemented to obtain the weight of the user whereas an ultrasonic sensor has been used to measure the height of the user. In addition, four electrode plates have been implemented on the foot weight scale to infuse a small amount of electric current (1mA) for BIA (bioelectrical impedance analysis) to estimate the amount of body fat percentage, lean body mass and total body water. An IR temperature sensor has been implemented in the research to measure the temperature of the user’s body from the forehead. Tests conducted on the system illustrate that it is able to accurately compute the body mass index and perform a bioelectrical impedance analysis on the user. The system is able to achieve a 92.5 % and 93.7 % accuracy in determining the body mass index and body fat percentage respectively. An accuracy of 95.3 % was observed in the determination of the body temperature.
Volume: 18
Issue: 1
Page: 317-331
Publish at: 2020-02-01

A survey on android security: development and deployment hindrance and best practices

10.12928/telkomnika.v18i1.13288
Ratul; Department of CSE, BUET, Dhaka Sikder , Md Shohel; Department of CSE, BUET, Dhaka Khan , Md Shohrab; Department of CSE, BUET, Dhaka Hossain , Wazir Zada; Jazan University, Saudi Arabia Khan
Android OS is the most popular mobile OS for the past few years. Vulnerabilities arise with respect to the increasing functionality of Android OS, impolitic app development practices of developers, end-user incautious and interestingly remediation for the vulnerabilities has been introduced frequently as well. To mitigate security risk factor Google has been updated, deprecated and restricted many system level APIs for 3rd party developers. Considering the consequences, this paper provides a wide overview of Android’s system level app development, privacy issues, and guideline for the developers about what measure they should consider while developing apps. We also discussed the historical development of Android OS and the end-users role to maintain privacy and to minimize security risks.
Volume: 18
Issue: 1
Page: 485-499
Publish at: 2020-02-01

Time-based α+ miner for modelling business processes using temporal pattern

10.12928/telkomnika.v18i1.12733
Yutika Amelia; Universitas Airlangga Effendi , Riyanarto; Institut Teknologi Sepuluh Nopember Sarno
Business processes are implemented in an organization. When a business process is run, it generates event log. One type of event log is double timestamp event log. Double timestamp has the start and complete time of each activity executed in the business process and has a close relationship with temporal pattern. In this paper, seven types of temporal pattern between activities were presented as extended version of relations used in the double timestamp event log. Since the event log was not always executed in sequential way, therefore using temporal pattern, event log was divided into several small groups to mine the business process both sequential and parallel. Both temporal pattern and Time-based α+ Miner algorithm were used to mine process model, determined sequential and parallel relations and then evaluated the process model using fitness value. This paper was focused on the advantages of temporal pattern implemented in Time-based α+ Miner algorithm to mine business process. The results also clearly stated that the proposed method could present better result rather than that of original α+ Miner algorithm.
Volume: 18
Issue: 1
Page: 114-123
Publish at: 2020-02-01

Influence of Ba[Mg2Al2N4]Eu2+ phosphor particle size on optical properties of the 6000K CPW-LEDs

10.12928/telkomnika.v18i1.13714
Phu Tran; Industrial University of Ho Chi Minh City Tin , Duy-Hung; Ton Duc Thang University Ha , Tran Thanh; National Key Laboratory of Digital Control and System Engineering Trang , Q. S.; Hongbang International University Vu
In this paper, we consider the red phosphor Ba[Mg2Al2N4]Eu2+ as the novel recommendation for improving the optical properties of the 6000K conformal packaging WLEDs (CPW-LEDs). For this purpose, we investigate the influence of the Ba[Mg2Al2N4]Eu2+ particle size on the optical properties in terms of CCT, CQS, CRI, and LO using the Light Tools and Mat Lab software. From the research results, it can be observed that the optical properties of the 6000K CPW-LEDs are significantly influenced by the size of the Ba[Mg2Al2N4]Eu2+ particle. The CRI and CQS increase from 65 to 67 and 64 to 68 while the size of the Ba[Mg2Al2N4]Eu2+ particle varies from 1 μm to 10 μm, respectively. This research can provide a novel recommendation for LEDs industry at this time.
Volume: 18
Issue: 1
Page: 174-178
Publish at: 2020-02-01

A developed GPS trajectories data management system for predicting tourists' POI

10.12928/telkomnika.v18i1.13006
Rula Amjed; Institute of informatics for Postgraduate studies Hamid , Muayad Sadik; University of Technology-Iraq Croock
One of the areas that have challenges in the use of internet of things (IoT) is the field of tourism and travel. The issue here is how to employ this technology to serve the tourism and managing the produced data. This work is focus on the use of tourists' trajectories that are collected from global positioning system (GPS) mobile sensors as a source of information. The aim of work is to predict preferred tourism places for tourists by tracking tourists' behavior to extract the tourism places that have been visited by such tourists. Density based clustering algorithm is mainly used to extract stay points and point of interest (POI). By projecting GPS location (for user and places) on the Google map, the type and name of places favored by the tourists are determined. K nearest neighbor (KNN) algorithm with haversine distance has been adopted to find the nearest places for tourists. The evaluation of the obtained results shows superior and satisfactory performance that can reach the objective behind this work.
Volume: 18
Issue: 1
Page: 124-132
Publish at: 2020-02-01

Oxygen free graphene/TiO2 nanocomposite synthesis technique for dye-sensitized solar cells photo-anode

10.11591/ijeecs.v17.i2.pp637-645
Hussein A. AlSultan , M. A. Mustafa , S. Shafie , W. Z. W. Hasan , A. Khalifa
This article presents the techniques for the synthesis of oxygen-free graphene for doped in titanium dioxide TiO2. This work hypothesised the introduction of a new method for incorporating graphene nanoplatelets GNP in Anatase TiO2 using adhesive nanocomposite material, which has been done to enhance the conductivity of the nanocomposite. This work also argues with lamina problems in Graphene oxide, which reduce electron mobility and cause the electron pathways to be rerouted. The characteristics of the nanocomposite measure the colour difference, the photocurrent-voltage measurement (I-V measurement), Raman Spectroscopy, and Energy Dispersive Spectroscopy EDS. Simple visual observation results for various thin films show a colour shade difference due to the better dispersion of the nanocomposites. The uniform colour change with different weight ratios can also show the distribution of graphene sheets. Similarly, similar ratios to photocurrent-voltage readings were obtained by the different nanocomposite weights in I-V measurement. The Raman spectroscopy also recognises the existence of well-composed 2D energy band GNP sheets cooperated inside the TiO2. Finally, the work concludes with the reduction of the oxygen in weight ratios atomic, which lead to a better atomic level and the optimal weight ratio of GNP sheets to Titanium to increase the free mobility of electrons.
Volume: 17
Issue: 2
Page: 637-645
Publish at: 2020-02-01
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