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Architecture of an efficient dual band 1.8/2.5 GHz rectenna for RF energy harvesting

10.12928/telkomnika.v17i6.12314
Jahariah; Institute of Microengineering and Nanoelectronics, Universiti Kebangsaan Malaysia (IMEN-UKM) Sampe , Noor Hidayah Mohd; Institute of Microengineering and Nanoelectronics, Universiti Kebangsaan Malaysia (IMEN-UKM) Yunus , Jumri; Institute of Microengineering and Nanoelectronics, Universiti Kebangsaan Malaysia (IMEN-UKM) Yunas , Alipah; Universiti Kuala Lumpur, British Malaysian Institute (UniKL-BMI) Pawi
This paper presents a highly efficient rectenna of RF energy harvesting systems operating at 1.8 GHz and 2.5 GHz bands for battery-less sensor application. The antenna is designed by CST-MWS. The Schottky diode used for rectifying circuit is HSMS 286B in which designed by Agilent ADS. The key finding of the paper is that the simulated DC output voltage of the rectenna is 1.35 V for low input power of -25 dBm at a high resistance load of 1M Ω. Correspondingly, the RF-DC conversion efficiency of the rectification process is 59.51% and 45.75% at 1.8 GHz and 2.5 GHz, which are high efficiency and much better compared to literature respectively. The rectenna is capable to produce 1.8 V from an input power of -20 dBm. Thus, the proposed RF energy harvesting system offers a promising solution designed for efficient functionality at a low power level of RF energy in the dual band.
Volume: 17
Issue: 6
Page: 3137-3144
Publish at: 2019-12-01

Assessing the intelligence of a student through TIC-TAC-TOE game for career guidance

10.11591/ijece.v9i6.pp5545-5551
Sastry Kodanda Rama Jammalamadaka , Chandra Prakash Vudatha
In order to provide Career Guidance by an expert system to a student, apart from his/her academic record, it is necessary to assess various psychological factors of the student like Intelligence, patience and perseverance, Learning ability and Speed of solving problem, etc. The outcome of this research work is an expert system called Tic-Tac-Toe Game Playing Career Guidance System (TTT-GP-CGS) that is useful to assess the psychological factors of the student through Tic-Tac-Toe Game Playing, build the cognitive model of the student and predict the appropriate career(s) for the student. The system plays Tic-Tac-Toe game with the student several times. The average score obtained by the student reflects his/her intelligence. The average time taken by the student for playing the game reflects student's speed of solving problem. The number of attempts the student makes reflects the students patience and perseverance. When the student plays the game with the spaystem every day, if the student's  score increases day by day, it reflects that the student has good learning ability. In this way the system will assess the psychological factors of the student and builds the cognitive model of the student. Internally the system converts the quantitative scores into qualitative scores. The system maintains a table of careers and the expected levels of psychological factors that are required from student's side to carry out the career successfully. The system invokes a matching process  by considering the cognitive model of the student and the table of careers, and predicts the career(s) suitable  to the student.
Volume: 9
Issue: 6
Page: 5545-5551
Publish at: 2019-12-01

Hierarchical robust fuzzy sliding mode control for a class of simo under-actuated systems with mismatched uncertainties

10.12928/telkomnika.v17i6.13176
Duc Ha; Hunan University Vu , Shoudao; Hunan University Huang , Thi Diep; Saodo University Tran
The development of the algorithms for single input multi output (SIMO) under-actuated systems with mismatched uncertainties is important. Hierarchical sliding-mode controller (HSMC) has been successfully employed to control SIMO under-actuated systems with mismatched uncertainties in a hierarchical manner with the use of sliding mode control. However, in such a control scheme, the chattering phenomenon is its main disadvantage. To overcome the above disadvantage, in this paper, a new compound control scheme is proposed for SIMO under-actuated based on HSMC and fuzzy logic control (FLC). By using the HSMC approach, a sliding control law is derived so as to guarantee the stability and robustness under various environments. The FLC as the second controller completely removes the chattering signal caused by the sign function in the sliding control law. The results are verified through theoretical proof and simulation software of MATLAB through two systems Pendubot and series double inverted pendulum.
Volume: 17
Issue: 6
Page: 3027-3043
Publish at: 2019-12-01

Implementation simulink modeling to analysis the transient cases and torque speed characteristic in a three phase induction motors

10.11591/ijeecs.v16.i3.pp1077-1087
Omar Al-barbarawi , Ghazi M. Qaryouti
In this research, has been a developed  modular approach  for investigation of the dynamic behavior and analysis the steady -state and transient cases  for a three-phase induction motor when it is fed with a balanced and unbalanced voltage , and analysis the  behavior of the Torque-Speed characteristics at various conditions. This analysis is done systematically by development two mathematically models. Where the first model is proposed   to simulate the dynamic behavior of the motor when supplying it at balanced and unbalanced voltage in Matlab/Simulink by using d-q axis theory in the reference frame. This model can investigate and described in details the behavior of the induction motor  parameters, and enables the researcher to calculate or investigate any variable for an induction machine  parameter ; (e.g. The  voltage, current, flux, speed and torque as a function of time) in both cases  transient and steady state , when the motor in operation state  [11-16].  The other model is proposed to simulate in the Microsoft Excel program, by using  the ratio between the conventions  of the electromagnetic torque equation(Tem)  and maximum torque equation (Tmax) . To study and analysis the behavior of the Torque-Speed characteristics for a 3-phase induction motor. Where this models study's by using Excel program's and Matlab / Simulink to simulation the effect of the various parameters on the dynamic behavior of the motor such as  inserting variable external resistance in series with rotor circuit , and when supplying the stator by variable voltage. These Mathematical models could be   used for a wide range of motors which has a various horse powers , which needing it in a scientific research and practical applications.
Volume: 16
Issue: 3
Page: 1077-1087
Publish at: 2019-12-01

Twitter data analysis using hadoop ecosystems and apache zeppelin

10.11591/ijeecs.v16.i3.pp1490-1498
Stanly Wilson , Sivakumar R
The day-to-day life of the people doesn't depend only on what they think, but it is affected and influenced by what others think. The advertisements and campaigns of the favourite celebrities and mesmerizing personalities influence the way people think and see the world. People get the news and information at lightning speed than ever before. The growth of textual data on the internet is very fast. People express themselves in various ways on the web every minute. They make use of various platforms to share their views and opinions. A huge amount of data is being generated at every moment on this process. Being one of the most important and well-known social media of the present time, millions of tweets are posted on Twitter every day. These tweets are a source of very important information and it can be made use for business, small industries, creating government policies, and various studies can be performed by using it. This paper focuses on the location from where the tweets are posted and the language in which the tweets are written. These details can be effectively analysed by using Hadoop. Hadoop is a tool that is used to analyze distributed big data, streaming data, timestamp data and text data. With the help of Apache Flume, the tweets can be collected from Twitter and then sink in the HDFS (Hadoop Distributed File System). These raw data then analyzed using Apache Pig and the information available can be made use for social and commercial purposes. The result will be visualized using Apache Zeppelin.
Volume: 16
Issue: 3
Page: 1490-1498
Publish at: 2019-12-01

Classification of web services using data mining algorithms and improved learning model

10.12928/telkomnika.v17i6.11510
M. Swami; Malla Reddy Engineering College Hyderabad Das , A.; JNT University Hyderabad Govardhan , D.; Mahatma Gandhi Institute of Technology Vijaya Lakshmi
As per the global digital report, 52.9% of the world population is using the internet, and 42% of the world population is actively using e-commerce, banking, and other online applications. Web servicesare software components accessed using networked communications and provide services to end users. Software developers provide a high quality of web service. To meet the demands of user requirements, it is necessary for a developer to ensure quality architecture and quality of services. To meet the demands of user measure service quality by the ranking of web services, in this paper, we analyzed QWS datasetand found important parameters are best practices, successability, availability, response time, reliability and throughput, and compliance. We have used various data mining techniques and conductedexperiments to classify QWS data set into four categorical values as class1, 2, 3, and 4. The results are compared with various techniques random forest, artificial neural network, J48 decision tree, extremegradient boosting, K-nearest neighbor, and support vector machine. Multiple classifiers analyzed, and it was observed that the classifier technique eXtreme gradient boosting got the maximum accuracy of98.44%, and random forest got the accuracy of 98.13%. In future, we can extend the quality of web service for mixed attributes.
Volume: 17
Issue: 6
Page: 3191-3202
Publish at: 2019-12-01

Transformation and dynamic visualization of images from computer through an FPGA in a matrix of LED

10.12928/telkomnika.v17i6.12710
Edwar Jacinto; Universidad Distrital Francisco José de Caldas Gómez , Fernando Martínez; Universidad Distrital Francisco José de Caldas Santa , Holman Montiel; Universidad Distrital Francisco José de Caldas Ariza
This article shows the implementation of a system that uses a graphic interface to load a digital image into a programmable logic device, which is stored in its internal RAM memory and is responsible for visualizing it in a matrix of RGB LEDs, so that This way, the LEDs show an equivalent to the image that was sent from the PC, conserving an aspect ratio and respecting as much as possible the color of the original image. To carry out this task, a Matlab script was designed to load the image, convert and format the data, which are transmitted to the FPGA using the RS232 protocol. The FPGA is in charge of receiving them, storing them and generating all the signals of control and synchronization of the system including the control of the PWM signals necessary to conserve the brightness of each one of the LEDs. This system allows the visualization of static images in standard formats and, in addition, thanks to the flexibility of the hardware used, it allows the visualization of moving images type GIF.
Volume: 17
Issue: 6
Page: 3003-3009
Publish at: 2019-12-01

Interface protocol design: a communication guide for indoor FANET

10.12928/telkomnika.v17i6.13296
B.O.; Ahmadu Bello University Zaria Sadiq , A. T.; Ahmadu Bello University Zaria Salawudeen , Y. A.; Ahmadu Bello University Zaria Sha’aban , E. A.; Ahmadu Bello University Zaria Adedokun , M. B.; Ahmadu Bello University Zaria Mu’azu
The present and the future routing protocols in relation to the high throughput requirement, adaptivity to fast-changing link topology and speed makes the choice of routing protocol for unmanned aerial vehicle communication important. Due to this fact, an efficient routing protocol is highly dependent on the nature of the communication link. A flexible solution that presents these features is the use of light fidelity as a communication medium. Therefore, this paper presents the design of an interface protocol for indoor Flying Ad-hoc Network specific routing protocol using light fidelity as a communication link. The interface protocol governs communication when UAV move in a swarm. The architecture, the state machine model is discussed in this paper. Results of the design are validated via simulation using the NS3 in terms of packet delivery ratio and throughput.
Volume: 17
Issue: 6
Page: 3175-3182
Publish at: 2019-12-01

Cloud connected smart home gas cylinder platform based wifi control

10.11591/ijict.v8i3.pp117-121
C.R. Balamurugan , P. Vijayakumar
Gas sensing technology has become topical research work for quite some time and we also want to protect our home asserts from any kind of hazards. In this work we take an overview on how to protect our home from fire and its safety issues based on wireless sensor network using wifi and cloud technologies. It also showcases the research done on the detection mechanism of leakage of domestic cooking gas at ambient condition. It can detect the fire, leakage of gas or smoke and sends an auto-generated email remotely to intimate the owner. We survey and examine the existing work in security system and its applications.
Volume: 8
Issue: 3
Page: 117-121
Publish at: 2019-12-01

Wayfinding learning techniques and its challenges: a case study at malaysian association for the blind (MAB)

10.11591/ijeecs.v16.i3.pp1562-1568
Nazatul Naquiah Abd Hamid , Wan Adilah Wan Adnan , Fariza Hanis Abdul Razak
Navigating safely in the real environment especially in the outdoor setting requires a blind person to be equipped with the spatial knowledge and possess the skills in mobility and orientation. The aims of this study are to investigate the existing wayfinding learning techniques taught to blind people and to identify the challenges during the teaching and learning processes. A two days of observation during a mobility practical session was conducted at Malaysian Association for the Blind (MAB). The first objective was to explore the current techniques used by mobility instructor to teach visually impaired students for a wayfinding and second, to identify the challenges faced by the mobility instructor and the visually impaired students in the teaching and learning processes of wayfinding. The study discovered that the major problem faced by the mobility instructor was with the lack of teaching aids to describe a new environment to visually impaired students. This leads to the lack of time that caused the visually impaired students perceived insufficient information which was hard for them to construct the intended cognitive maps. From the findings, this paper concludes by discussing the recommendations primarily on the use of technology in addressing the problems identified in this study.
Volume: 16
Issue: 3
Page: 1562-1568
Publish at: 2019-12-01

Design and implementation of low power consumption wireless sensor node

10.12928/telkomnika.v17i6.12047
Djadour; University of Mohamed Bachir El Ibrahimi Imededdin , Aidel; University of Mohamed Bachir El Ibrahimi Salih , Hicham; Ferhat Abbas University of Setif-1 Medkour
This work proposes an implementation of wireless sensor node characterized by its very low power consumption. The node comprises three main components: Xbee module, low power PIC microcontroller and digital sensor. The node can be set to sense then transmit data via one of two transmission methods: periodic and by interruptions. To evaluate the power consumption; currents in the node is measured during the different transmission stages for both methods. As a result, a significant reduction in the power consumption is shown particularly in sleep mode compared to conventional transmission methods. The characteristic of low power consumption makes the proposed node practically ecologic. It can also be fed with the extrem low power supplied by an energy harvesting system.
Volume: 17
Issue: 6
Page: 2729-2734
Publish at: 2019-12-01

Modelling of wireless sensor networks for detection land and forest fire hotspot

10.12928/telkomnika.v17i6.12971
Evizal Abdul; Universitas Islam Riau Kadir , Hitoshi; Chiba University Irie , Sri Listia; Universitas Islam Riau Rosa , Mahmod; Universiti Teknologi Petronas Othman
Indonesia located in South East Asia countries with tropical region, forest fires in Indonesia is one of big issue and disaster because it happens in almost of every year, this is because of some of region consist of peat land that high risk for fire especially in dry season. Riau Province is one of region that regularly incident of forest fire with affected the length and breadth of Indonesia. Propose development of Wireless Sensor Networks (WSNs) for detection of land and forest fire hotspot in Indonesia as well as one of the main consents in this research, case location in Riau province is at one of the regions that high risk forest fire in dry season. WSNs technology used for ground sensor system to collect environmental data. Data training for fire hotspot detection is done in data center to determine and conclude of fire hotspot then potential to become big fire. The deployment of sensors located at several locations that has potential for fire incident, especially as data shown in previous case and forecast location with potential fire happen. Mathematical analysis is used in this case for modelling number of sensors required to deploy and the size of forest area. The design and development of WSNs give high impact and feasibility to overcome current issues of forest fire and fire hotspot detection in Indonesia. The development of this system used WSNs highly applicable for early warning and alert system for fire hotspot detection.
Volume: 17
Issue: 6
Page: 2772-2781
Publish at: 2019-12-01

Implementing bezier surface interpolation and N.N in shape reconstruction and depth estimation of a 2D image.

10.11591/ijeecs.v16.i3.pp1609-1616
Mohamed Ibrahim Shujaa , Ammar Alauldeen Abdulmajeed
This paper considers a 2D image depth estimation of an object and reconstructed it into a 3D object image. The 2D image is defined by slices contains asset of points that are located along the object contours and within the object body. The depth of these slices are estimated using the neural network technique (N.N), where five factors (slice length, angle of incident light and illumination of some of point that located along the 2D object, namely control points)are used as inputs to the network the estimated depth of the slice are mapped into a 3D surface using the interpolation technique of the Bezier spleen surface. The experimental results showed an effective performance of the proposed approach.
Volume: 16
Issue: 3
Page: 1609-1616
Publish at: 2019-12-01

Benefits of triple-layer remote phosphor structure in improving color quality and luminous flux of white LED

10.12928/telkomnika.v17i6.13094
Thuc Minh; Nha Trang University Bui , Phan Xuan; National Key Laboratory of Digital Control and System Engineering Le , Dinh Hoang; Ton Duc Thang University Bach , Nguyen Doan; Ton Duc Thang University Quoc Anh
Remote phosphor structure has higher luminous efficiency comparing to that of both conformal phosphor and in-cup phosphor structures. However, it is hard to control the color quality of remote phosphor structure, and this issue has become one of the most researchable objectives to many researchers in recent years. Up to now, there are two remote phosphor structures applied to improve the color quality, including dual-layer phosphor configuration and triple-layer phosphor configuration. The purpose of this research is to select one of those configurations to have multi-chip white LEDs (WLEDs) achieved the highest color rendering index (CRI), color quality scale (CQS), luminous efficacy (LE), and color uniformity. In this research, WLEDs with two correlated color temperatures (CCT) of 6600K and 7700K were applied. The obtained results showed that triple-layer phosphor configuration is more outstanding in CRI, CQS, and LE. Moreover, the color deviation has been significantly reduced, which means the color uniformity has been enhanced with the application of triple-layer phosphor configuration. These results can be proven by scattering properties of phosphor layers based on Mie theory. Thus, the researched results have become a reliable and valuable reference for manufacturing higher-quality WLEDs.
Volume: 17
Issue: 6
Page: 2940-2947
Publish at: 2019-12-01

Real time simulation of sensorless control based on back-EMF of PMSM on RT-Lab/ARTEMIS real-time digital simulator

10.11591/ijaas.v8.i4.pp269-278
Abdelhakim Idir , A. Ahriche , K. Khettab , Y. Bensafia , M. Kidouche
Real-time simulation (RT) is very useful for rapid prototyping of complex and expensive systems using the high performance of a multiprocessor system. It has many applications in the field of testing controllers and protection systems under real conditions. In this article, Real-time simulations results of sensorless control of permanent magnet synchronous motor (PMSM) are presented. This simulator consists of two major subsystems, software with a Matlab / Simulink and hardware including FPGA boards for data acquisition, control boards and sensors. The two subsystems were coordinated together to achieve the simulation RT. To estimate the rotor position, a sliding mode observer (SMO) based on back emfs of the motor was implemented. The stability of the proposed method was verified using the concept of Lyapunov. A real-time system based on FPGA, is used for implementing and testing the algorithm for rotor position estimation based on back-emf tracking.
Volume: 8
Issue: 4
Page: 269-278
Publish at: 2019-12-01
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