Articles

Access the latest knowledge in applied science, electrical engineering, computer science and information technology, education, and health.

Advanced Search
Filter Icon

Filters article

Years

FAQ Arrow
Single Year
Range Year
0
0

Source Title

FAQ Arrow

Authors

FAQ Arrow

29,922 Article Results

Analysis and Identification the Complexity of Data Heterogeneity on Learning Environment Using Ontology

10.12928/telkomnika.v13i1.1321
Arda; Universiti Teknologi Malaysia Yunianta , Mohd Shahizan; Universiti Teknologi Malaysia Othman , Norazah; Universiti Teknologi Malaysia Yusof , Lizawati; Universiti Teknologi Malaysia Mi Yusuf , Juwairiah; Universiti Teknologi Malaysia Juwairiah , Nurul Syazana; Universiti Teknologi Malaysia Selamat
Distributed and various systems on learning environment are the current issues to produce big data and heterogeneity data problem. Heterogeneity on learning environment is about numerous learning applications and various learning information to support a learning process in educational institutions. There are a lot of relationships are formed between elements on learning environment. The elements on learning environment consist of learning data, learning applications, data sources, learning concept, and data heterogeneity aspect on learning environment. These elements are interrelated and produce complex relationship between each other. A complex relationship problem between elements on learning environment makes a process of analysis and identification difficult to be done. Existing method to drawing this heterogeneity problem make confuse and misunderstanding readers. To solved this problem, researcher using ontology knowledge to describe and draw a semantic relationship that represent the complexity of data relationship on learning environment. The result of this analysis is to develop ontology knowledge to solve heterogeneity data problem specific in complexity relationship on learning environment. This result can give better understanding to the readers about complex relationship between elements on learning environment.
Volume: 13
Issue: 1
Page: 341-348
Publish at: 2015-03-01

A Novel Neuro-Fuzzy Controller for Multilevel Renewable Energy System

10.11591/ijai.v4.i1.pp20-28
T PAVAN KUMAR , B N KARTHEEK
Recently, Development and the utilization of single phase based multilevel inverters has been increased. This paper proposes concept based new topology based seven level inverter with less number of power electronics switches with utility grid connection. This proposed multilevel inverter operates with only eight power electronics switches at their fundamental frequency. This inverter produces seven level output from the input here we considered as a photovoltaic system. The cost, complexity, switching losses are small due to because of usage of less number of switches. The DC/DC converter receives input from which the three positive output voltages are generated and the multilevel inverter performs as a polarity reversal that provides both the positive and negative cycle output. For further enhancement in the output waveform, the filter circuit can be integrated in the output terminal of the multilevel inverter. This paper also proposed a concept of a neuro-fuzzy controller for controlling the seven level inverter. The simulation results are observed by means of MATLAB simulink toolbox.
Volume: 4
Issue: 1
Page: 20-28
Publish at: 2015-03-01

Three Phase Trinary Source MLI Using Multicarrier SPWM Strategies

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/4228
T. Sengolrajan , B. Shanthi , M. Arumugam
This paper presents a comprehensive analysis of various bipolar Multicarrier Pulse Width Modulation (MCPWM) strategies with Sinusoidal reference for three phase Nine level Trinary Source cascaded  inverter.  A new approach of nine levels is for medium voltage applications. The proposed topology uses reduced number of switching devices and thus reducing losses and low THD in comparison with the conventional topology. The configuration of the circuit is simple and easy to control. Performance factors such as %THD, VRMS where measured and Crest Factor (CF), Distortion Factor (DF), Form Factor (FF) of output voltage were calculated for different modulation indices and the results were compared. VFPWM strategies provides minimum THD and COPWM strategy provides higher fundamental VRMS output voltage. DOI: http://dx.doi.org/10.11591/telkomnika.v13i3.7181 
Volume: 13
Issue: 3
Page: 483-492
Publish at: 2015-03-01

Arduino-Uno Based Mobile Data Logger with GPS Feature

10.12928/telkomnika.v13i1.1300
Muhammad Abu Bakar; Universiti Teknologi Malaysia Sidik , Mohd Qamarul; Universiti Teknologi Malaysia Arifin Rusli , Zuraimy; Universiti Teknologi Malaysia Adzis , Zolkafle; Universiti Teknologi Malaysia Buntat , Yanuar Zulardiansyah; Universiti Teknologi Malaysia Arief , Hamizah; Universiti Teknologi Malaysia Shahroom , Zainuddin; Universitas Sriwijaya Nawawi , Muhammad; Universitas Sriwijaya ‘Irfan Jambak
Lightning activity correlates with the formation of thunderclouds which increase the atmospheric electric field (AEF) between the cloud and the earth. Observations of the development of the AEF will allow the prediction of lightning activities close to a particular location. In research and development, the data logger plays an important role to observe and collect data from AEF sensors. The data logger must be reliable and effective. High investment costs are involved in acquiring a data logger, and choosing a suitable data logger is not easy. Institut Voltan dan Arus Tinggi (IVAT) is develeloping AEF sensor. Along with that sensor development a data logger development is also required. In this paper, a mobile data logger is developed by using Arduino-Uno. This mobile data logger is equipped with a GPS module, which provides accurate positioning in the collection of data. Laboratory and field tests were carried out to observe the performance of the mobile data logger system. The results showed that the developed data logger works properly.
Volume: 13
Issue: 1
Page: 250-259
Publish at: 2015-03-01

Design and Development of an Agorithm for Prioritizing the Test Cases Using Neural Network as Classifier

10.11591/ijai.v4.i1.pp14-19
Amit Verma , simranjeet kaur
Test Case Prioritization (TCP) has gained wide spread acceptance as it often results in good quality software free from defects. Due to the increase in rate of faults in software traditional techniques for prioritization results in increased cost and time. Main challenge in TCP is difficulty in manually validate the priorities of different test cases due to large size of test suites and no more emphasis are made to make the TCP process automate. The objective of this paper is to detect the priorities of different test cases using an artificial neural network which helps to predict the correct priorities with the help of back propagation algorithm. In our proposed work one such method is implemented in which priorities are assigned to different test cases based on their frequency. After assigning the priorities ANN predicts whether correct priority is assigned to every test case or not otherwise it generates the interrupt when wrong priority is assigned. In order to classify the different priority test cases classifiers are used. Proposed algorithm is very effective as it reduces the complexity with robust efficiency and makes the process automated to prioritize the test cases.
Volume: 4
Issue: 1
Page: 14-19
Publish at: 2015-03-01

Internet Pricing on Bandwidth Function Diminished With Increasing Bandwidth Utility Function

10.12928/telkomnika.v13i1.117
Indrawati; Universitas Sriwijaya Indrawati , Irmeilyana; Universitas Sriwijaya Irmeilyana , Fitri Maya; Universitas Sriwijaya Puspita , Oky; Universitas Sriwijaya Sanjaya
In this paper we analyze the internet pricing schemes based on bandwidth function diminished with increasing bandwidth utility function with 3 pricing strategies for homogeneous and heterogeneous consumer. The new proposed pricing schemes with this utility function will give the information to the internet service providers (ISP) in maximizing profits and provide better service quality for users. The Models on every type of consumer are applied to the data traffic in Palembang local server. LINGO 11.0 is used to compute the nonlinear programming problem to get the optimal solution. The results showed that for each case based on 3-pricing scheme, ISPs get better profit by choosing all three schemes in consumers type of homogenous case while for heterogeneous cases on willingness to pay and based on demand of the consumers, ISPs can select flat fee scheme to gain higher profit rather than those two other schemes.
Volume: 13
Issue: 1
Page: 299-304
Publish at: 2015-03-01

Heterogenous Traffic Performances on Local Multipoint Distribution Service System in Rainy Environment

10.12928/telkomnika.v13i1.1194
Naemah; Universitity of North Sumatera Mubarakah , Suherman; University of North Sumatera Suherman , Yulianta; University of North Sumatera Siregar , Arman; University of North Sumatera Sani
Local multipoint distribution service (LMDS) system provides high bitrates services up to 40 Mbps operating in millimeter bands. The radio system can be employed to serve heterogenous traffics in any applications such as video surveillance, public internet hotspots and other services. However, the implementation in tropical area faces transmission problems which degrade signal reception, such as heavy rain. This paper examines the performance of heterogenous traffics in LMDS in a rainy environment. Some techniques to tackle rain ploblems were implemented and the effects were assesed. It was proven that PHY and MAC layers contribute to performances enhancement on rainy environment as long as the system uses the suitable scheduler. A packet-based scheduler was proposed by considering packet impact on quality. The results showed that the proposed technique is able to improve video performance about 0.02% over the maximum signal to noise (mSNR) scheduler, maintain voice decoding rate as well as the priority fair (PF) scheduler and increase data decodibility 0.2%.
Volume: 13
Issue: 1
Page: 230-237
Publish at: 2015-03-01

Nonlinear-Filtering with Interacting Multiple-Model Algorithm for Coastal Radar Target Tracking System

10.12928/telkomnika.v13i1.791
Rika; Indonesian Institute of Sciences (LIPI) Sustika , Joko; Indonesian Institute of Sciences (LIPI) Suryana
This paper presents a performance evaluation of nonlinear filtering with Interacting Multiple Model (IMM) algorithm for implementation on Indonesian coastal radar target tracking system. On this radar, target motion is modeled using Cartesian coordinate but target position measurements are provided in polar coordinate (range and azimuth). For this implementation, we investigated two types of nonlinear filtering, Converted Measurement Kalman Filter (CMKF) and Unscented Kalman Filter (UKF). IMM algorithm is used to anticipate target motion uncertainty. Many simulations on radar target tracking are developed under assumption that noise characteristic is known. In this paper, the performance of IMM-CMKF and IMM-UKF is evaluated for condition that radar doesn’t know noise characteristic and there is mismatch on noise modeling. Results from simulation show that IMM-CMKF has better performance than IMM-UKF when tracking maneuvering trajectory. Results also show that IMM-CMKF is more robust than IMM-UKF when there is mismatch on noise modeling.
Volume: 13
Issue: 1
Page: 211-220
Publish at: 2015-03-01

Utilizing the Optimization Algorithm in Cascaded H-Bridge Multilevel Inverter

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/4225
M.Suresh Kumar , Ramani Kannan
This paper proposed the elimination of undesired harmonic in a Cascaded H-Bridge Multi-Level Inverter by using Selective Harmonic Elimination-Pulse Width Modulation strategy with programmed Particle Swarm Optimization algorithm. In Selective Harmonic Elimination Pulse Width Modulation technique, PSO algorithim is used to determine the non-linear transcendental equation to precise obligatory switching angles for eliminate low order harmonics and reduce the Total Harmonic Distortion from the inverter output voltage waveform while maintaining the required fundamental voltage at the desired value. Computational results are validate that the proposed method does competently eliminate the low order harmonics and also resulted in minimum Total Harmonic Distortion value. The results exposed that the proposed method can achieve efficaciously to the optimal solution more rapidly than other algorithms. DOI: http://dx.doi.org/10.11591/telkomnika.v13i3.7132
Volume: 13
Issue: 3
Page: 458-466
Publish at: 2015-03-01

An Image Compression Scheme Based on Fuzzy Neural Network

10.12928/telkomnika.v13i1.1270
Bo; North University of China Wang , Yubin; North University of China Gao
Image compression technology is to compress the redundancy between the pixels to reduce the transmission broadband and storage space by using the correlation of the image pixels. Fuzzy neural network effectively integrates neural network technology and fuzzy technology; combines learning, self-adaptivity, imagination and identity and uses rule-based reasoning and fuzzy information processing in the nodes; thus greatly improving the transparency of fuzzy neural network. This paper mainly investigates the applications of fuzzy neural network in image compression and realizes the image compression and reconstruction of fuzzy neural network. It is demonstrated in the simulation experiment that the image compression algorithm based on fuzzy neural network has significant advantages in training speed, compression quality and robustness.
Volume: 13
Issue: 1
Page: 137-145
Publish at: 2015-03-01

PDF Based Icing Image Recognition Applied to Online Early Warning System for Transmission Lines

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/4223
Xin Yin , Xu Chen , Ertao Lei , Minghao Wen
This paper proposes an online early warning technique and the probability distribution function based icing image recogition for overhead power transmission lines. The main functionality of the online early warning of icing, forest fire,lighting, insulator flashover, conductor gallopiong and invasion which is based on a scheme of the online inspection system for the transmission lines with optical fibre communication technology. As a case study, the early warning of icing is discussed in this paper and a comprehensive icing early warning scheme has been proposed: the local meteorological conditions and mechanical data are applied for the initial criteria of the icing early warning system, and the PDF based image recognition technology is then used to finally decide the icing condition of transmission lines, which can be mor effectively dealt with than complex pictures acquired at towers. DOI: http://dx.doi.org/10.11591/telkomnika.v13i3.7210
Volume: 13
Issue: 3
Page: 441-448
Publish at: 2015-03-01

Critical Data Routing (CDR) for Intra Wireless Body Sensor Networks

10.12928/telkomnika.v13i1.365
Javed Iqbal; Faculty of Computing, Universiti Teknologi Malaysia (UTM) Bangash , Abdul Hanan; Faculty of Computing, Universiti Teknologi Malaysia (UTM) Abdullah , Mohammad Abdur; Faculty of Computing, Universiti Teknologi Malaysia (UTM) Razzaque , Abdul Waheed; Faculty of Computing, Universiti Teknologi Malaysia (UTM) Khan
Recently, Wireless Body Sensor Network (WBSN) has been emerged as a promising technology to provide medical and healthcare monitoring. It can significantly reduce the health-care cost by providing continuous health monitoring facility to the elderly people suffering from chronic diseases. The life critical and real time medical application of WBSNs requires the assurance of the demanded Quality of Service (QoS) both in terms delay and reliability. This paper proposes Critical Data Routing (CDR) that categorizes the sensory data packets as critical and non-critical data packets. Along with the heterogeneous natured data, it also addresses the high and dynamic path loss and the temperature rise issues caused by postural movement of the human body and electromagnetic waves absorption respectively. The simulation results show that the proposed CDR scheme achieves its designed objective of forwarding the critical data packets within certain time limits and with highest reliability while reducing the temperature rise of the in-body sensor nodes.
Volume: 13
Issue: 1
Page: 181-192
Publish at: 2015-03-01

Ultrasonic Tomography of Immersion Circular Array by Hyperbola Algorithm

10.12928/telkomnika.v13i1.1320
Liu; Beijing Institute of Technology Yang , Chunguang; Beijing Institute of Technology Xu , Xianghui; Beijing Institute of Technology Guo , Liping; Flinders University Wang
This paper presents a development and research of a non-invasive ultrasonic tomography for imaging gas/liquid two-phase flow. Ultrasonic transmitting and receiving are implemented using a circular array model that consists of 36 transducers. COMSOL Multiphysics® software is adopted for the simulation of the ultrasonic propagation in the detecting zone. Various two-phase flows with different gas distributions are radiated by ultrasonic waves and the reflection mode approach is utilized for detecting the scattering waves after the generation of fan-shaped beam. Ultrasonic attenuation and sound speed are both taken into consideration while reconstructing the two-phase flow images under the inhomogeneous medium conditions. The inversion procedure of the image reconstruction is realized using the hyperbola algorithm, which in return demonstrates the feasibility and validity of the proposed circular array model.
Volume: 13
Issue: 1
Page: 65-75
Publish at: 2015-03-01

Overview of Custom Microcontroller using Xilinx Zynq XC7Z020 FPGA

10.12928/telkomnika.v13i1.1122
Bayu; Bina Nusantara University Kanigoro , Ricky Efraim; Bina Nusantara University Lie , M. Fitra; Bina Nusantara University Kacamarga
This paper presents an overview of customizable microcontroller using a Xilinx Zynq XC7Z020 FPGA as an alternative to increase its performance as user need. This alternative arises due to many of the systems, which developed mostly by using microcontroller are not giving any room for customization to increase its performance or I/O ports. There is any possibility that the system designed to be used by using general processor such as PC to increase its performance but it will give another problem such as interface difficulty for high speed I/O, real time processing, increases complexity, and many more. Customization is introduced by combining hard IP processor and FPGA in one chip instead of practicing two separate devices, processor and FPGA, which is commonly use in high performance embedded design. This approach allows seamless design development and development time reduction for customization.
Volume: 13
Issue: 1
Page: 364-372
Publish at: 2015-03-01

Family Health Monitoring System Based on the Four Sessions Internet of Things

10.12928/telkomnika.v13i1.1265
Yang; Hebei North University Jingjing , Hao; Hebei North University Shangfu , Zhang; Hebei North University Xiao , Guo; Hebei North University Benzhen , Liu; Hebei North University Yu , Dong; Hebei North University Beibei , Liu; China System Technology Lab, IBM, Shanghai Yun
The accelerating pace of modern life results in the lack of effective care of people’s health status. Nowadays, resorting to the technology of the Internet of Things, we can provide home health monitoring services to minimize the impact of the disease brought to people. In this article, we proposed the realization method for the architecture of the four sections of the Internet of Things oriented to home health monitoring service, furthermore, the secondary the smoothness index method is applied to the monitoring of human health index, data from body temperature detection experiments verified the feasibility of the four sessions system, which laid firm foundations for the requirement of real-time and accuracy of the Internet of Things based home health monitoring system with a common reference significance and value in use.
Volume: 13
Issue: 1
Page: 314-320
Publish at: 2015-03-01
1 2 3
...
1994 1995
Show 1741 of 1995

Discover Our Library

Embark on a journey through our expansive collection of articles and let curiosity lead your path to innovation.

Explore Now
Library 3D Ilustration