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31,456 Article Results

A verification of periodogram technique for harmonic source diagnostic analytic by using logistic regression

10.12928/telkomnika.v17i1.10390
M.; Universiti Teknikal Malaysia Melaka Manap , M. H.; Universiti Teknikal Malaysia Melaka Jopri , A. R.; Universiti Teknikal Malaysia Melaka Abdullah , R.; Universiti Teknikal Malaysia Melaka Karim , M. R.; Universiti Teknikal Malaysia Melaka Yusoff , AH; Universiti Teknikal Malaysia Melaka Azahar
A harmonic source diagnostic analytic is vital to identify the root causes and type of harmonic source in power system. This paper introduces a verification of periodogram technique to diagnose harmonic sources by using logistic regression classifier. A periodogram gives a correct and accurate classification of harmonic signals. Signature recognition pattern is used to distinguish the harmonic sources accurately by obtaining the distribution of harmonic and interharmonic components and the harmonic contribution changes. This is achieved by using the significant signature recognition of harmonic producing load obtained from the harmonic contribution changes. To verify the performance of the propose method, a logistic regression classifier will analyse the result and give the accuracy and positive rate percentage of the propose method. The adequacy of the proposed methodology is tested and verified on distribution system for several rectifier and inverter-based loads.
Volume: 17
Issue: 1
Page: 497-507
Publish at: 2019-02-01

Study of CMOS power amplifier design techniques for ka-band applications

10.11591/ijeecs.v13.i2.pp808-817
A.F Hasan , S.A. Z Murad , K.N Abdul Rani , F.A. Bakar , T.Z.A Zulkifli
This paper reviews of high efficiency CMOS power amplifiers (PAs) in millimeter (mm) wave Ka - Band applications. The study is focused on the challenges in designing PA especially in GHz frequencies inclusive of high gain, good input and output matching, efficiency, linearity, low group delay and low power consumption. Several works on CMOS PA from year 2009 to 2018 are discussed in this paper. Recent developments of CMOS PAs are examined and a comparison of the performance criteria of various techniques is presented.
Volume: 13
Issue: 2
Page: 808-817
Publish at: 2019-02-01

Stereo matching based on absolute differences for multiple objects detection

10.12928/telkomnika.v17i1.9185
Rostam Affendi; Universiti Teknikal Malaysia Melaka Hamzah , Melvin Gan Yeou; Universiti Teknikal Malaysia Melaka Wei , Nik Syahrim Nik; Universiti Teknikal Malaysia Melaka Anwar
This article presents a new algorithm for object detection using stereo camera system. The problem to get an accurate object detion using stereo camera is the imprecise of matching process between two scenes with the same viewpoint. Hence, this article aims to reduce the incorrect matching pixel with four stages. This new algorithm is the combination of continuous process of matching cost computation, aggregation, optimization and filtering. The first stage is matching cost computation to acquire preliminary result using an absolute differences method. Then the second stage known as aggregation step uses a guided filter with fixed window support size. After that, the optimization stage uses winner-takes-all (WTA) approach which selects the smallest matching differences value and normalized it to the disparity level. The last stage in the framework uses a bilateral filter. It is effectively further decrease the error on the disparity map which contains information of object detection and locations. The proposed work produces low errors (i.e., 12.11% and 14.01% nonocc and all errors) based on the KITTI dataset and capable to perform much better compared with before the proposed framework and competitive with some newly available methods.
Volume: 17
Issue: 1
Page: 261-267
Publish at: 2019-02-01

Performance evaluation of arithmetic coding data compression for internet of things applications

10.11591/ijeecs.v13.i2.pp591-597
Nor Asilah Khairi , Asral Bahari Jambek , Rizalafande Che Ismail
Wireless Sensor Network (WSN) is known for its autonomous sensors, where it has been found to be useful during the development of Internet of Things (IoT) devices. However, WSN is also known for its limited energy supply and memory space, as it carries small-sized batteries and memory space. Hence, a data compression approach has been introduced in this paper with the purpose of solving this particular issue. This paper focused on the performance of the Arithmetic Coding algorithm. Temperature (Temp), Sea-Level Pressure (Pressure), stride interval (Stride), and heart rate (BPM) were chosen as the dataset in this project. Based on the results, the compression ratio of Temp, Pressure, Stride, and BPM were 0.428, 0.255, 0.217, and 0.159 respectively. From this analysis, BPM produced the best compression ratio. Undeniably, the Arithmetic Coding algorithm is one of the best methods to compress real-world datasets. Hence, by using this approach, it can reduce the usage of energy and memory space.Wireless Sensor Network (WSN) is known for its autonomous sensors, where it has been found to be useful during the development of Internet of Things (IoT) devices. However, WSN is also known for its limited energy supply and memory space, as it carries small-sized batteries and memory space. Hence, a data compression approach has been introduced in this paper with the purpose of solving this particular issue. This paper focused on the performance of the Arithmetic Coding algorithm. Temperature (Temp), Sea-Level Pressure (Pressure), stride interval (Stride), and heart rate (BPM) were chosen as the dataset in this project. Based on the results, the compression ratio of Temp, Pressure, Stride, and BPM were 0.428, 0.255, 0.217, and 0.159 respectively. From this analysis, BPM produced the best compression ratio. Undeniably, the Arithmetic Coding algorithm is one of the best methods to compress real-world datasets. Hence, by using this approach, it can reduce the usage of energy and memory space.
Volume: 13
Issue: 2
Page: 591-597
Publish at: 2019-02-01

Comparison of stemming algorithms on Indonesian text processing

10.12928/telkomnika.v17i1.10183
Afian Syafaadi; Institut Teknologi Sepuluh Nopember Rizki , Aris; Institut Teknologi Sepuluh Nopember Tjahyanto , Rahmat; University of Brawijaya Trialih
Stemming is one of the stages performed on the process of extracting information from the text. Stemming is a process of converting words into their roots. There is an indication that the most accurate stemmer algorithm is not the only way to achieve the best performance in information retrieval (IR). In this study, seven Indonesian stemmer algorithms and an English stemmer algorithm are compared, they are Nazief, Arifin, Fadillah, Asian, Enhanched confix stripping (ECS), Arifiyanti and Porter. The data used are 2,734 tweets collected from the official twitter account of PLN. First, the aims are to analyze the correlation between stemmer accuracy and information retrieval performance in Indonesian text language. Second, is to identify the best algorithm for Indonesian text processing purpose. This research also proposed improved algorithm for stemming Indonesian text. The result shows that correlation found in the previous research does not occur for the Indonesian language. The result also shows that the proposed algorithm was the best for Indonesian text processing purpose with weighted scoring value of 0.648.
Volume: 17
Issue: 1
Page: 95-102
Publish at: 2019-02-01

A coupled-line balun for ultra-wideband single-balanced diode mixer

10.12928/telkomnika.v17i1.11607
M. Y.; Universiti Teknikal Malaysia Melaka (UTeM) Algumaei , N. A.; Universiti Teknikal Malaysia Melaka (UTeM) Shairi , Z.; Universiti Teknikal Malaysia Melaka (UTeM) Zakaria , A. M.; Universiti Teknikal Malaysia Melaka (UTeM) Zobilah , N.; Universiti Teknikal Malaysia Melaka (UTeM) Edward
A multi-section coupled-line balun design for an ultra-wideband diode mixer is presented in this paper. The multi-section coupled-line balun was used to interface with the diode mixer in which it can deliver a good impedance matching between the diode mixer and input/output ports. The mixer design operates with a Local Oscillator (LO) power level of 10 dBm, Radio Frequency (RF) power level of -20 dBm and Intermediate Frequency (IF) of 100 MHz with the balun characteristic of 180° phase shift over UWB frequency (3.1 to 10.6 GHz), the mixer design demonstrated a good conversion loss of -8 to -16 dB over the frequency range from 3.1 to 10.6 GHz. Therefore, the proposed multi-section coupled-line balun for application of UWB mixer showed a good isolation between the mixer’s ports.
Volume: 17
Issue: 1
Page: 246-252
Publish at: 2019-02-01

The use of enhancement material in grounding system: a review

10.11591/ijeecs.v13.i2.pp453-460
Aizat Azmi , Noor Azlinda Ahmad , Lau Kwan Yiew , Z. Abdul-Malek
This paper reviews the improvement of grounding impedance in grounding system by means of enhancement materials. Various enhancement materials for the past 20 years will be reviewed according to their advantages and disadvantages, followed by a focus on the technique for proper measurement set up based on the standard. In addition to that, the condition of enhancement materials under high voltage exposure is reviewed. Many researchers claim that soil resistivity, moisture content, and surrounding environment are the most contributed to the grounding system specifically on the grounding impedance. Hence, the utilization of enhancement materials is essential in order to maintain the grounding system performance.
Volume: 13
Issue: 2
Page: 453-460
Publish at: 2019-02-01

Lane detection system for day vision using altera DE2

10.12928/telkomnika.v17i1.10071
Amjad J.; University of Technology Humaidi , Mohammed Abdulraheem; University of Information Technology and Communication Fadhel , Ahmed R.; Middle Technical University Ajel
The active safety systems used in automotive field are largely exploiting lane detection technique for warning the vehicle drivers to correct any unintended road departure and to reach fully autonomous vehicles. Due to its ability, to be programmed, to perform complex mathematical functions and its characterization of high speed processing, Field Programmable Gate Array (FPGA) could cope with the requirement of lane detection implementation and application. In the present work, lane detection is implemented using FPGA for day vision. This necessitates utilization of image processing techniques like filtering, edge detection and thresholding. The lane detection is performed by firstly capturing the image from a video camera and converted to gray scale. Then, a noise filtering process for gray image is performed using Gaussian and average filter. Methods from first and second order edge detection techniques have been selected for the purpose of lane edge detection. The effect of manually changing the threshold level on image enhancement has been examined. The results showed that raising threshold level would better enhance the image. The type of FPGA device used in the present work is Altera DE2. Firstly, the version DE2 Cyclone II start with (11xxxxxx-xxxx) together with Genx camera has been used. This camera supports both formats NTSC and PAL, while the above version of FPGA backups only NTSC format. The software of lane detection is designed and coded using Verilog language.
Volume: 17
Issue: 1
Page: 349-361
Publish at: 2019-02-01

Remote interpreter API model for supporting computer programming adaptive learning

10.12928/telkomnika.v17i1.11585
Rosihan Ari; Universitas Sebelas Maret Yuana , Ignasius Agus; Universitas Sebelas Maret Leonardo , Cucuk Wawan; Universitas Sebelas Maret Budiyanto
Despite the adoption of Learning Management Systems (LMS) has been continuously growing in the last decade few, if any, scholars addressed the lack of the interactivity in online learning systems. The requirement for an interactive learning model has been increasingly prominent as content providers realize the importance of personalization of content suits to learners’ learning progress. This paper demonstrates the adoption of adaptive learning into existing LMS engine to overcome the limitation of either systems plugins or server specification pertinent to students’ psychomotor abilities in computer programming learning. In this regard,  the psychomotor is understood as the ability of students to write the program code as correctly as expected. In this study, a web API model that works to run an interpreter based-program code remotely was developed. The web API model can be utilized by LMS so it becomes the solution to the problem. The structure of the web API model has been adapted to the needs of the learning assessment. The implementation of the developed API web model is done in Python and PHP programming languages. The performance test was done by submitting 10 to 100 program codes simultaneously indicated no significant difference to the required resources (CPU usage and memory usage) to run the program code. Furthermore, for response time, the average time needed to run Python and PHP program code is also no significant difference. The average of CPU usage required by the web API to run a Python program code is 0.2058% with 0.5973 seconds as a response time. Meanwhile, to run the PHP program code, the average CPU usage required is 0.8074% with 0.3110 seconds response time. It can be concluded that the web API performance does not overburden the server.
Volume: 17
Issue: 1
Page: 153-160
Publish at: 2019-02-01

Study of direct current motor power requirement for manikin smart irrigation systems

10.12928/telkomnika.v17i1.11622
Folkes E.; Politeknik Negeri Kupang Laumal , Darmawan; Indonesian Institute of Sciences Banten Napitupulu , Oktaf B.; UIN Sultan Syarif Kasim Riau Kharisma , Kusa B. N.; Politeknik Negeri Kupang Nope , Robinson A.; Politeknik Negeri Kupang Wadu
Manikin Irrigation Area (I.A) has ± 3000 ha of the area, utilizes the water source from the Tefmo Dam and distributes to the Primary-Secondary-Tertiary channels with controlled by watergates that operated by lift. This mechanism has resulted in jealousy and squabbles in farmer groups because of the inequality distribution that ultimately decreases crop production. The development of Microcontroller Technology has changed the Watergate model into an automated system based on certain parameters and algorithms. One of that being developed is the smart irrigation system based on Arduino at Manikin I.A that regulates the water to land based on the time from the Real-Time Clock sensor and uses Direct Current (DC) motor as a driver to watergate. While it may work, but the system has not considered the power requirement of DC motor when the water flows in the maximum discharge and pressure affecting the motor. This study examines the power requirement of an ideal DC motor for smart watergate in 5 open channels in Manikin I.A. Based on the open channel standard parameters, a total load measurement is performed when the water given speed (V) and pressure (p) then converted to energy. The study results that on 5 different open channels in Manikin I.A, with 0.30 m3/s maximum water discharge and 7.56 m/s2 flow rate, a watergate control requires DC motor that has 35 to 43 Watt power (39,4 Watt average power) or 3 to 3.5 Ampere current (3,26 Ampere average Current) in order to 24-hours work.
Volume: 17
Issue: 1
Page: 400-407
Publish at: 2019-02-01

Performance enhancement of OCDMA system based on sequential algorithm (SeQ) Code

10.11591/ijeecs.v13.i2.pp831-836
C. A. S. Fazlina , C. B. M. Rashidi , S. N. Azemi , S. A. Aljunid , S. Yaakob
This paper presents a new class of Sequential Algorithm (SeQ) code for Optical Code Division Multiple Access (OCDMA) system. The SeQ code has advantages of various cross – correlation property at any given number of users, and code weights. The result shown, at error floor BER = 10-09, the SeQ code capability to support 190 numbers of simultaneous users was higher than those achieved by FCC (W=4), DCS (W=4) and MFH (W=4). SeQ code excellently support 190 number of users due to due to the arrangement of code algorithm and flexibility cross-correlation (0 and 1) role. In addition, SeQ code capable to support up to 70 km for bit rate 155 Mbps in comparison 622 Mbps, 1 Gbps, and 2 Gbps be able to support 40km, 30km and 20km respectively. Hence, we can ascertain that PIIN and MAI are successfully eliminated for SAC-OCDMA coding system.
Volume: 13
Issue: 2
Page: 831-836
Publish at: 2019-02-01

Analysis of DBSCAN and K-means algorithm for evaluating outlier on RFM model of customer behaviour

10.12928/telkomnika.v17i1.9394
Siti; Universitas Islam Negeri Sultan Syarif Kasim Monalisa , Fitra; Universitas Islam Negeri Sultan Syarif Kasim Kurnia
The aim of study is to discover outlier of customer data to found customer behaviour. The customer behaviour determined with RFM (Recency, Frequency and Monetary) models with K-Mean and DBSCAN algorithm as clustering customer data. There are six step in this study. The first step is determining the best number of clusters with the dunn index (DN) validation method for each algorithm. Based on the dunn index, the best cluster values were 2 clusters with DN value for DBSCAN 1.19 which were minpts and epsilon value 0.2 and 3 and DN for K-Means was 1.31. The next step was to cluster the dataset with the DBSCAN and K-Means algorithm based on the best cluster that was 2. DBSCAN algorithm had 37 outliers data and K-means algorithm had 63 outliers (cluster 1 are 26 outliers and cluster 2 are 37 outliers). This research shown that outlier in DBSCAN and K-Means in cluster 1 have similarities is 100%. But overal outliers similarities is 67%. Based the outliers shown that the behaviour of customers is a small frequency of spending but high recency and monetary.
Volume: 17
Issue: 1
Page: 110-117
Publish at: 2019-02-01

Anthropomorphic transradial myoelectric hand using tendon-spring mechanism

10.12928/telkomnika.v17i1.11600
Mochammad; Diponegoro University Ariyanto , Rifky; Diponegoro University Ismail , Joga D.; Diponegoro University Setiawan , Elga P.; Diponegoro University Yuandi
In the developing countries, the need for prosthetic hands is increasing. In general, transradial amputee patients use prosthetic hands that are passive like a body-powered prosthesis. This research proposes a low-cost myoelectric prosthetic hand based on 3D printing technology. Hand and finger size were designed based on the average size of human hands in Indonesia. The proposed myoelectric hand employs linear actuator combined with the tendon-spring mechanism. Myoelectric hand was developed with five modes of grip pattern to perform various object grasping in activity of daily living. Control strategy had been developed for controlling the motion of flexion and extension on the hand and saving the energy consumed by the actuators. The control strategy was developed under MATLAB/Simulink environment and embedded to Arduino Nano V3 using Simulink Support Package for Arduino Hardware. Surface electromyography (EMG) sensor was used in this research for reading the muscle activity of the user/wearer. The proposed myoelectric hand had been tested in object grasping test and was implemented on a study participant with transradial amputee.
Volume: 17
Issue: 1
Page: 537-548
Publish at: 2019-02-01

Thermal distribution analysis of rice weevil disinfestation using microwave heating treatment

10.11591/ijeecs.v13.i2.pp759-765
Maliki Ibrahim , Rosemizi Abd Rahim , Junita Mohd Nordin , Siti Zulaika Abdul Nyzam , Muhammad Thaqif Abdullah
This paper presents an analysis of a microwave heating thermal distribution in the rice weevil disinfestation treatment. The sample of rice and rice weevil has been heated by microwave and the infrared thermal camera has been used to capture the heating distribution. The analysis of the rice and the rice weevil condition due to electromagnetic energy exposure is presented. There are three stages of the microwave heating has been taken in the analysis i.e. 10, 20, 30 seconds exposure period at 100W of energy.  Found that the treatment of rice weevil disinfestation using microwave energy is promising in the future, but needs a lot of improvement to be studied. The beauty of using microwave energy for rice weevil disinfestation is not only the rice weevil can be killed, but even its eggs or larvae inside the rice kernel will be killed before it hatches.
Volume: 13
Issue: 2
Page: 759-765
Publish at: 2019-02-01

DC bus stabilization using passive damping network in distributed power system with constant power load

10.12928/telkomnika.v17i1.11715
Awang Bin; Universiti Teknologi Malaysia Jusoh , Mohamad Hamka Bin; Universiti Teknologi Malaysia Saiful , Tole; Universitas Ahmad Dahlan Sutikno
In distributed power system (DPS), the stability performance is always associated with the behaviour of constant power load (CPL). Since DPS large complex system build up from many power electronic converters, the DC bus of the system becomes unstable due to the strenuous action from power converters. When these converters tightly regulated, it behaves as constant power load and exhibit negative incremental input impedance which becomes the main reason in stability degradation of DPS. In this paper, four passive damping network topologies was proposed to reduce the DC bus instability. The best damping performance of the topologies was chosen and analysed using MATLAB/Simulink. The DC bus performances was studied in four cases which are damping behavior due to CPL power level, CPL disconnection, effects of filter and damping capacitor, and effects of filter cut-off frequency. Simulation results obtained shows that the DC bus was successfully stabilized and the resonance damped when passive damper installed. An experimental hardware tests was conducted to verify the proposed damping method and the results were compared with the simulated output waveforms. The analysis results in overshoot, settling time and steady state error of bus voltage shows system improvement with the proposed damper network.
Volume: 17
Issue: 1
Page: 425-437
Publish at: 2019-02-01
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