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A comparative approach between different optimize result in hybrid energy system using HOMER

10.11591/ijece.v9i1.pp141-147
Shweta Goyal , Sachin Mishra , Anamika Bhatia
To compare the different result of optimization of a hybrid energy system. A hybrid renewable energy system (HRES) is the combination of renewable and non-renewable sources which is playing a very important role for rural area electrification when grid extension is not possible or excessively expensive. Non renewable sources like diesel power generator (optional) are used in a HRES for backup when renewable energy supply is not sufficient. While the HRES is very important due to the smallest natural and physical contact compared to non renewable sources, this work proposed a comparison outcome with the help of different component by using HOMER software and get best optimize result for the model. This paper presents a wide-ranging review of various aspects of HRES. This paper discusses study, best sizing, and model, organize aspect and reliability issue.
Volume: 9
Issue: 1
Page: 141-147
Publish at: 2019-02-01

Implementation of web scraping on github task monitoring system

10.12928/telkomnika.v17i1.11613
Rolly Maulana; Politeknik Pos Indonesia Awangga , Syafrial Fachri; Politeknik Pos Indonesia Pane , Restiyana Dwi; Politeknik Pos Indonesia Astuti
Evolution of information and technology increasingly sophisticated, also influential in the field of education. One of the implementation of information and technology development in the field of education is e-learning or electronic learning. GitHub social network can be one of the e-learning media in studying software development because GitHub provides access control The number of contributors who commits or change in a repository to make the duration of the calculation process to fill the parameter value that has been determined. Based on the issue, this research aims to build a page capable of integrating information from the GitHub repository page. Integration of information will be made by utilizing web scraping technology. With a web page that integrates information from the GitHub repository page to get repository, collaborators, commits, and issues information, the lecturer does not need to calculate how often the participant contributes to the task.
Volume: 17
Issue: 1
Page: 275-281
Publish at: 2019-02-01

Optimization of smart traffic lights to prevent traffic congestion using fuzzy logic

10.12928/telkomnika.v17i1.10129
Dian; Sekolah Tinggi Teknik PLN Hartanti , Rosida Nur; Sekolah Tinggi Teknik PLN Aziza , Puji Catur; Sekolah Tinggi Teknik PLN Siswipraptini
One of the main causes of traffic congestion, especially at intersections, is because traffic lights have not been able to show the right time according to the existing traffic conditions. Time settings based on peak/off-peak traffic lights are not enough to handle unexpected situations. The fuzzy mamdani method makes decisions with several stages, the criteria used are the number of vehicles, the length of the queue and the width of the road to be able to optimize the time settings based on the real-time conditions required so that unwanted green signals (when there is no queue) can be avoided. The purpose of this research is to create a simulator to optimize traffic time management, so that the timers on each track have the intelligence to predict the right time, so that congestion at the intersection can be reduced by adding up to 15 seconds of green light from the previous time in the path of many vehicles.
Volume: 17
Issue: 1
Page: 320-327
Publish at: 2019-02-01

Modelling and implementation of 9tka game with MaxN algorithm

10.12928/telkomnika.v17i1.11590
Dina; Universitas Pelita Harapan Stefani , Frederikus; Universitas Pelita Harapan J. , Irene Astuti; Universitas Pelita Harapan Lazarusli , Samuel; Universitas Pelita Harapan Lukas , Petrus; Universitas Pelita Harapan Widjaja
9tka is a board game created by Adam Kaluza. The game can be played with 2 up to 4 players, with the goal of conquering as many areas in the board as possible. The aim of this research is to implement the 9tka game into a digital game that can be played on a personal computer. The implementation will include the feature to play against computer players. The rules and game’s play of 9tka is modelled, and then implemented using Java. The Artificial Intelligence (AI) of the computer player is implemented using the MaxN algorithm, which is an extension of the minimax algorithm. Several tests were done to gauge the robustness of the implemented AI. The experiments show that the AI is capable to make a move in time less than 541 milliseconds on average, across all types of players. Moreover, from eight respondents, the average amount of human wins is 2.25 out of 5 matches, across all types of players. This shows that the implemented AI on computer player has a better chance to defeat human opponents.
Volume: 17
Issue: 1
Page: 210-217
Publish at: 2019-02-01

Generating similarity cluster of Indonesian languages with semi-supervised clustering

10.11591/ijece.v9i1.pp531-538
Arbi Haza Nasution , Yohei Murakami , Toru Ishida
Lexicostatistic and language similarity clusters are useful for computational linguistic researches that depends on language similarity or cognate recognition. Nevertheless, there are no published lexicostatistic/language similarity cluster of Indonesian ethnic languages available. We formulate an approach of creating language similarity clusters by utilizing ASJP database to generate the language similarity matrix, then generate the hierarchical clusters with complete linkage and mean linkage clustering, and further extract two stable clusters with high language similarities. We introduced an extended k-means clustering semi-supervised learning to evaluate the stability level of the hierarchical stable clusters being grouped together despite of changing the number of cluster. The higher the number of the trial, the more likely we can distinctly find the two hierarchical stable clusters in the generated k-clusters. However, for all five experiments, the stability level of the two hierarchical stable clusters is the highest on 5 clusters. Therefore, we take the 5 clusters as the best clusters of Indonesian ethnic languages. Finally, we plot the generated 5 clusters to a geographical map.
Volume: 9
Issue: 1
Page: 531-538
Publish at: 2019-02-01

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

High gain 5G MIMO antenna for mobile base station

10.11591/ijece.v9i1.pp468-476
Yusnita Rahayu , Indah Permata Sari , Dara Incam Ramadhan , Razali Ngah
This article presented a millimeter wave antenna which operated at 38 GHz for 5G mobile base station. The MIMO (Multiple Input Multiple Output) antenna consisted of 1x10 linear array configurations. The proposed antenna’s size was 88 x 98 mm^2  and printed on 1.575 mm-thick Rogers Duroid 5880 subsrate with dielectric constant of ε_r= 2.2 and loss tangent (tanδ) of 0.0009. The antenna array covered along the azimuth plane to provide the coverage to the users in omnidirection. The simulated results showed that the single element antenna had the reflection coefficient (S11) of -59 dB, less than -10 dB in the frequency range of 35.5 - 39.6 GHz. More than 4.1 GHz of impedance bandwidth was obtained. The gain of the antenna linear array was 17.8 dBi while the suppression of the side lobes was -2.7 dB.  It showed a high array gain throughout the impedance bandwidth with overall of VSWR were below 1.0646. It designed using CST microwave studio.
Volume: 9
Issue: 1
Page: 468-476
Publish at: 2019-02-01
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