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29,325 Article Results

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

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

Low-cost and Portable Process Control Laboratory Kit

10.12928/telkomnika.v16i1.6888
Ade Gafar; Universitas Pendidikan Indonesia Abdullah , Dadang Lukman; Universitas Pendidikan Indonesia Hakim , Muhammad Afif; Universitas Pendidikan Indonesia Auliya , Asep Bayu Dani; Universitas Pendidikan Indonesia Nandiyanto , Lala Septem; Universitas Pendidikan Indonesia Riza
The purpose of this study was to demonstrate a new design of low-cost and portable laboratory kit that is prospective for supporting teaching and learning on the automation process. The kit consists of the water tank filling system (sizes of 50 mL; as a model for describing reallistic tank in the plant) equipped with a programmable logic controller (PLC) integrated with SCADA system, human machine interface (HMI) monitor, reservoir, temperature, water level sensors, mixer, and heater. To be adaptable in any types of classroom, the kit was placed on the portable table (length x width x height of 100 x 50 x 150 cm). To approach the industrial tank system in industry, the tank was designed to be mixed and connected to other tank, and the temperature and water volumetric (water level) was controllable. To examine the impact of the designed kit on the improvement of teaching and learning process, the problem based learning (PBL) approach was also conducted in class. The economic analysis result showed that the present kit is inexpensive and portable, compared to other commercially available kits/devices. The PBL results showed that the kit is simple and to give better illustrations for students to comprehend the process control system in the realistic application in industry. Further developments of this kit is potentially implemented as an experimental tool for undergraduate students.
Volume: 16
Issue: 1
Page: 232-240
Publish at: 2018-02-01

Capacity Improvement and Protection of LTE Network on Ethernet Based Technique

10.12928/telkomnika.v16i1.7674
Fadli; Universitas Mercu Buana Jakarta Sirait , Akhmad Wahyu; Universitas Mercu Buana Dani , Triyanto; Universitas Mercu Buana Pangaribowo
High demands for data rates in mobile communications is the reason for developing broadband wireless access technologies. Long Term Evolution (4G LTE) networks which offer significantly higher data rates and require suitably higher capacity backhaul networks. To prepare for the high data rates usage in 4G LTE, operators are using ethernet services in terms of backhaul connectivity. Protection packet switching developed to anticipated network failure on ethernet based network technology. The failures in the network include the link fails to connect to each network element, the network element fails to transfer the data to the destination, or the quality drops below the standard. In this paper we used two ethernet based technique, namely Ethernet over SDH and MPLS-TP with ring protection to anticipated network failure on these techniques. Furthermore, we measured performance of network by measuring and comparing the throughput, latency and jitter between Ethernet over SDH and MPLS-TP. We used bandwidth capacity 240 Mbps as plant bandwidth link and worked in MIMO 2 2. The results of measurements indicated that MPLS-TP with ring protection is the best technique to enhanced the performance of LTE network.
Volume: 16
Issue: 1
Page: 200-209
Publish at: 2018-02-01

Electrical Interference Problemson Commercial Fishing Vessels – A Review

10.11591/ijeecs.v9.i2.pp271-274
Pankaj Kumar Sinha , Preetha Sharan
Canadian Coast Guard (CCG) provides Marine Communications centre (MCC) with financial assistance surveyed for Electromagnetic Compatibility and Electromagnetic Interference (EMC/EMI) correlated troubles on industrial based fishing vessels less than twenty metres. The electrical condition should be provided for the vessels and it is the goal of the survey. By performing "electrical noise" measurement method the necessary data was obtained. Several autopilot systems are susceptible to High Frequency Single Side Band (HF SSB) transmitters due to the absence of electrical noise suppression scheme. The main objective of the survey is to analyse the better electrical noise suppression method for fishing vessels.
Volume: 9
Issue: 2
Page: 271-274
Publish at: 2018-02-01

A Survey on Knowledge Transfer between Knowledge-based Systems

10.12928/telkomnika.v16i1.6517
Nyoman; Institut Teknologi Bandung Karna , Iping; Institut Teknologi Bandung Supriana , Nur; Institut Teknologi Bandung Maulidevi
The paper aims to clarify differences in knowledge sharing mechanisms between Knowledge-based Systems, including knowledge management system, web page-based knowledge, and expert system, in the hope that we can establish an automatic knowledge transfer between autonomous systems. This study lays the foundation for knowledge transfer mechanism where an autonomous Knowledge-based System may enhance its knowledge by using other system's knowledge. To design a knowledge transfer mechanism, the paper do a literature study by comparing three well-known protocols for knowledge sharing, OAI-PMH for knowledge management system, SPARQL for web page-based knowledge, and KQML for the expert system. The object of comparison is within three aspects, first is the ability to find another system, the second is knowledge retrieval from chosen system and third is how to add new knowledge into the system. The paper suggests that each protocol has its own strength and weakness, but when it comes to knowledge transfer, KQML covers more features. Therefore, based on this finding, the paper proposes a new model for autonomous knowledge transfer using KQML to enhance one Knowledge-based System's own knowledge.
Volume: 16
Issue: 1
Page: 265-273
Publish at: 2018-02-01

Pm-EEMRP: Postural Movement Based Energy Efficient Multi-hop Routing Protocol for Intra Wireless Body Sensor Network (Intra-WBSN)

10.12928/telkomnika.v16i1.7318
Tarique; Motilal Nehru Institute of National Institute of Technology Allahabad Rashid , Sunil; Motilal Nehru Institute of National Institute of Technology Allahabad Kumar , Akshay; Motilal Nehru Institute of National Institute of Technology Allahabad Verma , Prateek Raj; Motilal Nehru Institute of National Institute of Technology Allahabad Gautam , Arvind; Motilal Nehru Institute of National Institute of Technology Allahabad Kumar
Intra-WBSN plays an important role in health monitoring, military and consumer electronics. It iscomposed of wireless bio-sensor nodes which are strategically placed on the body. Due to body posture movement, network topology of Intra-WBSN changes continuously. It plays a significant role in Intra-WBSN. In proposed Pm-EEMRP, network stability, energy efficiency and high throughput are the prime parametersfor body posture movement in which sensing informations from bio-sensor nodes are forwarded to relay nodes. Relay nodesare deployed in cloths, which aggregate these data and forward it to body network controller (BNC). It provides reliable and comfortable health monitoring. Through simulation, the proposed routing protocol provides better network stability, improved energy efficiency and high throughput in comparison to conventional routing schemes.
Volume: 16
Issue: 1
Page: 166-173
Publish at: 2018-02-01
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