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27,544 Article Results

A Radial Line Slot Array (RLSA) Antenna with the Specifications of 16 dBi Outdoor patch Antenna

10.12928/telkomnika.v16i1.6727
Teddy; Universitas Islam Negeri Sultan Syarif Kasim Purnamirza , Safrizal; Universitas Islam Negeri Sultan Syarif Kasim Hasbi , Imran M.; Universiti Teknikal Malaysia Malaka Bin Ibrahim , Mulyono; Universitas Islam Negeri Sultan Syarif Kasim Mulyono , Fitri; Universitas Islam Negeri Sultan Syarif Kasim Amillia , Depriwana; Universitas Islam Negeri Sultan Syarif Kasim Rahmi
It is recommended by several researches that RLSA antennas have possibility as an option for Wi-Fi devices antennas. Therefore, to dig deeper this possibility, we designed a RLSA antenna that mimics the specification of an antenna usually found in market, that is 16 dBi outdoor patch antenna. We carried out a parameterization to get a best RLSA antenna model. The model was then fabricated and measured. The measurement results are quite agrees with the simulation results. We found that with the same size of 0.05 m2, our RLSA antennas has better performance in term of gain (2 dB higher), S11 (7 dB lower), and beamwidth (900 wider) compared to the patch antenna. A significant result is that RLSA antenna has much wider bandwidth (815 MHz wider) compared to the patch antenna. A test to our RLSA antenna as an antenna for Wi-Fi devices shows that it works properly.
Volume: 16
Issue: 1
Page: 46-52
Publish at: 2018-02-01

Current State of Personal Data Protection in Electronic Voting: Criteria and Indicator for Effective Implementation

10.12928/telkomnika.v16i1.7718
Muharman; Telkom University Lubis , Mira; International Islamic University Malaysia Kartiwi , Sonny; International Islamic University Malaysia Zulhuda
The adoption of electronic voting has been done in various countries related to cost and time reduction operationally. On the other hand, recent publication has been informed several issues occurred such as technicality, reliability, security and privacy due to the compromised system were used. In small scale, there are certain group of people who want to exploit the vulnerabilities for their own benefit in the election, while in the greater scale, it can reduce public confidence to entrust the adoption of e-voting system to augment participation rate, to improve the quality of voting and to aid the political right effectively. This paper aims to investigate the characteristic of people demanding the legislative to address the criteria and indicator for effective implementation in electronic voting. By understanding the perception of voters in viewing current electoral regulation are essential to provide some ideas and opinions for better enhancement, either through recommendation and drafting related legislation to cater the needs.
Volume: 16
Issue: 1
Page: 290-301
Publish at: 2018-02-01

Growth-site Quality Assessment of Nypa fruticans using Unmanned Aerial Vehicles Images: A case study in Kubu Raya Regency, West Kalimantan Province

10.11591/ijeecs.v9.i2.pp502-511
Adelia Juli Kardika , I Nengah Surati Jaya , Nining Puspaningsih , Fairus Mulia
The growth-site quality is one of the essential information needed to support sustainable forest management particularly in forestry planning. This paper describes the development of a site-quality class of Nypa vegetation by considering the biological and physical factors. The main objective of this study is to develop a discriminant model and to find out major factors that may be used to predict the quality of Nypa growth-sites.The model was developed using variables either measured on UAV images or from field measurement, namely soil texture (X1), water salinity (X2), water pH (X3), crown closure (X4) and stand density (N) measured on the UAV image (X5). The study found that the site quality of Nypa could be indicated by the variation of its biomass content. Then, it was concluded that the major factors that affect the site quality are the soil texture (X1),water salinity (X2),and water pH (X3) with 78.3% of overall accuracy.
Volume: 9
Issue: 2
Page: 502-511
Publish at: 2018-02-01

Improved Field-Oriented Control for PWM Multi-level inverter-Fed Induction Motor Drives

10.11591/ijeecs.v9.i2.pp481-492
Daniel Legrand Mon Nzongo , Emilienne Leugoue , Jianhua Zhang , Gabriel Ekemb
This paper proposes a new approach to ensure the torque decoupled to the rotor flux of an induction machine based on the Field Oriented Control (FOC). The suggested method consists of inserting into the conventional d-q synchronous current controller, coupling terms of motor and multi-level inverter models. Making, the dynamic response of stator current components decoupled as well as the rotor flux and torque. In this paper, the mathematic model of an induction motor and multi-level inverter are first derived. Then, the synchronous current controller and modulation strategy for high power inverters are investigated. Finally, the validation through implementation and simulation of a 4.16 kV electric drive with MATLAB/Simulink and SimPowerSystems is performed.  The model simulated in this paper includes an induction motor, nine-level cascaded H-bridge inverter and a carrier based space vector pulse-width-modulation.The results of the simulations of each method has been recorded and the comparison results reveal that the proposed method effectively maintains the rotor flux decoupled to the torque.
Volume: 9
Issue: 2
Page: 481-492
Publish at: 2018-02-01

Embedded System Practicum Module for Increase Student Comprehension of Microcontroller

10.12928/telkomnika.v16i1.4194
Indrianto; STT-PLN Indrianto , Meilia Nur; STT-PLN Indah Susanti , Rakhmat; STT-PLN Arianto , Riki Ruli A.; STT-PLN Siregar
The result of applying the embedded system in education for students is successfully applied in university. On the other side, many people in Indonesia use smart equipment’s (Hand phone, Remote), but none of those equipments are used in education. University as the source of knowledge should overcome the problem by encouraging the students to use a technology with learning about it first. Embedded System Practicum Module Design needs a prototype method so that the practicum module that is desired can be made. This method is often used in real life. A prototype considered of a part of a product that expresses logic and physical of external interface that is being displayed and this method will fully depend on user contentment. Embedded System Practicum Module Design is made to increase student comprehension of embedded system course and to encourage students to innovate, so that many technologies will be developed and also to help lecturers deliver course subjects. With this practicum it is hoped that the student comprehension will increase significantly. The result of this research is a decent practicum module, hardware or software that can help students to know better about technology and the course subjects so that it will encourage the students to create an embedded system technology. The result of the test has been done; there is an increase of learning value obtained by 7.8%.
Volume: 16
Issue: 1
Page: 53-60
Publish at: 2018-02-01

Assessment of Early Hypertensive Retinopathy using Fractal Analysis of Retinal Fundus Image

10.12928/telkomnika.v16i1.6188
Wiharto; Sebelas Maret University Wiharto , Esti; Sebelas Maret University Suryani , Muhammad Y.; Sebelas Maret University Kipti
Hypertensive retinopathy is characterized by changes in retinal vessels, a change known as tortuosity. Automated analysis of retinal vascular changes will make it easier for clinicians to make an initial diagnosis of the disease. The pattern of blood vessels in the retina of the eye can be approached with a fractal pattern. This study proposes a method for the early detection of disease hypertensive retinopathy using the fractal analysis approach fundus retinal image. Variable fractal used is the fractal dimension and lacunarity, whereas for the classification algorithm using ensemble Random Forest and validation using the k-fold cross-validation. Performance measurement using the parameters of accuracy, positive prediction value (PPV), negative prediction value (NPV), sensitivity, specificity and area under the curve (AUC). The test results using 10-fold cross-validation values obtained accuracy 88.0%, PPV 84.0%, NPV 92.0%, sensitivity 91.3%, specificity 85.19%, and 88.25% AUC. The performance is produced when using lacunarity the box size 22. Based on the research results, it can be concluded that early detection of hypertensive retinopathy with fractal analysis approaches have a performance based on AUC produced included in good categories.
Volume: 16
Issue: 1
Page: 445-454
Publish at: 2018-02-01

Reduction of Mutual Coupling between Closely Spaced Microstrip Antennas Arrays Using Electromagnetic Band-gap (2D-EBG) Structures

10.12928/telkomnika.v16i1.7017
Ahmed; LMEET Laboratory FST of Settat Hassan 1st University Ghaloua , Jamal; LMEET Laboratory FST of Settat Hassan 1st University Zbitou , Larbi El; LMEET Laboratory FST of Settat Hassan 1st University Abdellaoui , Mohamed; Microwave group ESEO Angers France Latrach , Abdelali; LMEET Laboratory FST of Settat Hassan 1st University Tajmouati , Ahmed; LMEET Laboratory FST of Settat Hassan 1st University Errkik
Reducing mutual coupling is a key research area in design of compact microstrip antennas arrays. To minimize the overall size of the antennas arrays, the distance between them must be very small, as a result a strong mutual coupling is appears. Periodic structures can help to design a low profile of antennas arrays and enable to improve their performances by the suppression of surface waves propagation in a given frequency range. This paper proposes a novel configuration of mushroom-like electromagnetic band-gap (2D-EBG) structure created by microstrip technology placed between two antennas arrays to reduce the mutual coupling more than -33.24dB. When 13×2 EBG structures are used, the mutual coupling reduces to -59.36dB at the operation frequency 5.8GHz of the antennas arrays. A 26.12dB mutual coupling reduction is achieved, which proves that the surface wave is suppressed. The proposed configuration is designed, optimized, and miniaturized by using electromagnetic software CST Microwave Studio. The measured results show that there is a good agreement with the computed results.
Volume: 16
Issue: 1
Page: 151-158
Publish at: 2018-02-01

Performance Evaluation of Smart Home System using Internet of Things

10.11591/ijece.v8i1.pp400-411
Teddy Surya Gunawan , Intan Rahmithul Husna Yaldi , Mira Kartiwi , Hasmah Mansor
Nowadays, many researches have been conducted on smart home. Smart home control system (SHCS) can be integrated into an existing home appliances to reduce the need for human intervention, increase security and energy efficiency. We have proposed a smart home system using internet of things and four types of sensors, including PIR, temperature, ultrasonic, and smoke gas sensor for automatic environmental control and intrustion detection. In this paper, the performance of the previously developed prototype of smart home system will be evaluated. First, experiments on various sensors will be conducted. Next, the communicaton channel using wireless and Ethernet modules will be discussed. Moreover, the overall SHCS will be evaluated in terms of hardware and software performance. Additionaly, solar charger enhances the availability of our prototype system. Results showed the effectiveness of our proposed smart home system in the prototype and real life experiments.
Volume: 8
Issue: 1
Page: 400-411
Publish at: 2018-02-01

Modeling and Simulation of Biaxial Strained P-MOSFETs: Application to a Single and Dual Channel Heterostructure

10.11591/ijece.v8i1.pp421-428
Amine Mohammed Taberkit , Ahlam Guen-Bouazza , Benyounes Bouazza
The objectives of this work are focused on the application of strained silicon on MOSFET transistor. To do this, impact and benefits obtained with the use of strained silicon technology on p-channel MOSFETs are presented. This research attempt to create conventional and two-strained silicon MOSFETs fabricated from the use of TCAD, which is a simulation tool from Silvaco. In our research, two-dimensional simulation of conventional MOSFET, biaxial strained PMOSFET and dual channel strained P-MOSFET has been achieved to extract their characteristics. ATHENA and ATLAS have been used to simulate the process and validate the electronic characteristics. Our results allow showing improvements obtained by comparing the three structures and their characteristics. The maximum of carrier mobility improvement is achieved with percentage of 35.29 % and 70.59 % respectively, by result an improvement in drive current with percentage of 36.54 % and 236.71 %, and reduction of leakage current with percentage of 59.45 % and 82.75 %, the threshold voltage is also enhaced with percentage of: 60 % and 61.4%. Our simulation results highlight the importance of incorporating strain technology in MOSFET transistors.
Volume: 8
Issue: 1
Page: 421-428
Publish at: 2018-02-01

Temporal Exploration in 2D Visualization of Emotions on Twitter Stream

10.12928/telkomnika.v16i1.6591
Mochamad Nizar; Sepuluh Nopember Institute of Technology Palefi Ma'ady , Chuan-Kai; National Taiwan University of Science and Technology Yang , Renny Pradina; Sepuluh Nopember Institute of Technology Kusumawardani , Hatma; Sepuluh Nopember Institute of Technology Suryotrisongko
As people freely express their opinions toward a product on Twitter streams without being bound by time, visualizing time pattern of customers emotional behavior can play a crucial role in decision-making. We analyze how emotions are fluctuated in pattern and demonstrate how we can explore it into useful visualizations with an appropriate framework. We manually customized the current framework in order to improve a state-of-the-art of crawling and visualizing Twitter data. The data, post or update on status on the Twitter website about iPhone, was collected from U.S.A, Japan, Indonesia, and Taiwan by using geographical bounding-box and visualized it into two-dimensional heat map, interactive stream graph, and context focus via brushing visualization. The results show that our proposed system can explore uniqueness of temporal pattern of customers emotional behavior.
Volume: 16
Issue: 1
Page: 376-384
Publish at: 2018-02-01

System Performance Analysis of Half-Duplex Relay Network over Rician Fading Channel

10.12928/telkomnika.v16i1.7491
Phu Tran; Industrial University of Ho Chi Minh City Tin , Tran Hoang Quang; Ton Duc Thang University Minh , Tan N.; Ton Duc Thang University Nguyen , Miroslav; VSB Technical University of Ostrava Voznak
In this paper, the system performance of an amplify-and-forward (AF) relaying network over Rician Fading Channel is proposed, analyzed and demonstrated. For details this analysis, the energy and information are transferred from the source to the relay nodes by two methods: 1) time switching protocol and 2) power splitting protocol. Firstly, due to the constraint of the wireless energy harvesting at the relay node, the analytical mathematical expressions of the achievable throughput and the outage probability of both schemes were proposed and demonstrated. After that, the effect of various system parameters on the system performance is rigorously studied with closed-form expressions for the system performance. Finally, the analytical results are also demonstrated by Monte-Carlo simulation in comparison with the closed-form expressions. The numerical results demonstrated the effect of various system parameters, such as energy harvesting time, power splitting ratio, source transmission to noise power, and the threshold value, on the system performance of AF wireless relay nodes. The results show that the analytical mathematical and simulated results match for all possible parameter values for both schemes.
Volume: 16
Issue: 1
Page: 189-199
Publish at: 2018-02-01

Implementation of Antiestablishment Wire Fault Sensing Using CC3200

10.11591/ijeecs.v9.i2.pp357-360
S Shanmugasundaram
Underground cables are inclined to faults because of underground conditions. Detecting particular fault area in the underground cable is a tedious one for that the whole line is to be dug check and settle issues. The proposed method using IoT identifies the correct fault position that makes repairing work simple. The professional domain workers identify the fault area sometimes they also are not able to predict the fault location. Determining fault in the cable itself take lots of time, cash and endeavours and furthermore permit to service underground links speedier. An excellent Wi-Fi featured ARM Cortex-M4 microcontroller is utilised to implement the system. This device offers a total, ease, practical and easy to use method for continuous checking. The fault is acknowledged with the help of sensors placed over the cable. The cell phone application furnishes with a GUI to screen the information from a remote area. The cloud server act as the centre man between the hardware device and the cell phone application dealing with the data movement.
Volume: 9
Issue: 2
Page: 357-360
Publish at: 2018-02-01

Wireless Sensor Network over High Altitude Platform

10.12928/telkomnika.v16i1.8391
Veronica Windha; Institut Teknologi Bandung Mahyastuty , Iskandar; Institut Teknologi Bandung Iskandar , Hendrawan; Institut Teknologi Bandung Hendrawan , M. Sigit; Institut Teknologi Bandung Arifianto
One of Machine Type Communication (MTC) applications is Wireless Sensor Network (WSN). WSN is an intelligent network application system to collect, integrate, and transmit data autonomously. Sensor nodes in WSN, communicate over short distance via a wireless medium and collaborate to accomplish a common task, such as enviroment monitoring, military surveillance and industrial process control. The constraining aspect of WSN usage is the limited power of each sensor node, so energy efficiency becomes an important issue in WSN. Routing is a function in WSN, which consumes a substantial amount of energy. One of the routing protocols that can increase the energy efficiency of WSN is Low Energy Adaptive Clustering Hierarchy (LEACH). In this paper, High Altitude Platform (HAP) is used to replace Base Station (BS) as sink node in WSN. HAP is designed at altitudes of 17, 20 and 22 km. Then WSN over HAP using the LEACH routing protocol evaluated its performance. Performance indicators that we evaluated are engergy consumption, number of dead nodes and total average packets which is sent to HAP. From a series of simulations conducted, the results obtained that the higher the laying of HAP, then the coverage area will be greater. So that the energy consumption will be smaller, the number of dead node less and the avarage of total packet delivered to the HAP will be greater.
Volume: 16
Issue: 1
Page: 129-133
Publish at: 2018-02-01

Measuring Enterprise Resource Planning (ERP) Systems Effectiveness in Indonesia

10.12928/telkomnika.v16i1.5895
Adhi; University of Birmingham Wibowo , Marti; Universitas PGRI Yogyakarta Widya Sari
Refining DeLone and McLean’s (D&M) information system model and technology-organisation-environment (TOE) framework, this research identifies the prominent factors that determine ERP system success. Hypotheses are also drawn based on supporting theories to evaluate the causal relationship between the success determinants. The level of achievement is measured by system quality, information quality, service quality, external quality and top management support, which intermediated by perceived usefulness and user satisfaction towards business benefits. To provide empirical evidence, 86 valid samples out of 156 were collected using a web survey that targeted ERP users in Indonesia. Furthermore, Partial Least Squares–Structural Equation Modelling (PLS-SEM) algorithm were applied to check the proposed hypotheses. The results suggest system quality, information quality and service quality significantly affect user satisfaction, whereas they moderately impact on perceived usefulness. Interestingly, external pressures were reported as being the biggest influence on user satisfaction and positively impacted on perceived usefulness. Despite being fairly predictive to perceived usefulness, top management support along with general perceptual factors ultimately promote system success by elevating business benefits.
Volume: 16
Issue: 1
Page: 343-351
Publish at: 2018-02-01

Energy Management in Current Fed Switched Inverter Based Propulsion Motor for Marine Application

10.11591/ijeecs.v9.i2.pp282-285
Anand M , V Mathivananr
In this paper the super capacitor and battery based current fed switched converter produce high voltage gain and the performance of motor is improved. The fuel based renewable energy produce the less dynamic performance of the motor and life time is reduced so the proposed paper use the super capacitor based energy production. The permanent magnet synchronous based motor has high performance. The permanent magnet synchronous motor vector control strategy is adopted. The proposed method the inverter and motor are interconnected. The motor functioning is used in the marine based electric device. The proposed method use the space vector control method is used.  The possibility of the system and the control methods are established by MATLAB/ simulink environment.
Volume: 9
Issue: 2
Page: 282-285
Publish at: 2018-02-01
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