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

26,833 Article Results

Development of Acoustical Feature Based Classifier Using Decision Fusion Technique for Malay Language Disfluencies Classification

10.11591/ijeecs.v8.i1.pp262-267
Raseeda Hamzah , Nursuriati Jamil , Rosniza Roslan
Speech disfluency such as filled pause (FP) is a hindrance in Automated Speech Recognition as it degrades the accuracy performance. Previous work of FP detection and classification have fused a number of acoustical features as fusion classification is known to improve classification results. This paper presents new decision fusion of two well-established acoustical features that are zero crossing rates (ZCR) and speech envelope (ENV) with eight popular acoustical features for classification of Malay language filled pause (FP) and elongation (ELO). Five hundred ELO and 500 FP are selected from a spontaneous speeches of a parliamentary session and Naïve Bayes classifier is used for the decision fusion classification. The proposed feature fusion produced better classification performance compared to single feature classification with the highest F-measure of 82% for both classes.
Volume: 8
Issue: 1
Page: 262-267
Publish at: 2017-10-01

Miniature design of T-Shaped frequency Reconfigurable antenna for S-Band Application using Switching Technique

10.11591/ijece.v7i5.pp2426-2433
Omar El Maleky , Farid Ben Abdelouahab , Mohammad Essaaidi , Nasri Abdelfatah
The article presents a miniature antenna with a simple geometry and a simple approach for reconfiguration. In order to make the T-shaped antenna frequency reconfigurable, we integrated Switches in specific positions. The location of the switches is determined following a study of the distribution of the surface currents of the suggested antenna. Indeed, we found that the insertion of switches in places where the concentrations of surface currents are high is irrelevant. In fact, to redirect current flow, the PIN diodes or RF Switch must be placed in positions where the distribution of the surface currents is of low concentration. These locations facilitate the establishment of new trajectories of the flux of current. As a result, a miniature tunable antenna dimension 20mm*20mm*1.6mm printed on FR4 substrate with 4.4 permittivity and with  0.04 loss tangent,   the antenna  can be adopted in many communication devices in view of its small size, its low manufacturing cost and performance on frequency sweep, the antenna operates in S-Band with an acceptable band and gain. The antenna is simulated and optimized using CST Microwave Studio.
Volume: 7
Issue: 5
Page: 2426-2433
Publish at: 2017-10-01

Comparative Analysis of common Edge Detection Algorithms using Pre-processing Technique

10.11591/ijece.v7i5.pp2574-2580
R. Vijaya Kumar Reddy , K. Prudvi Raju , M. Jogendra Kumar , L. Ravi Kumar , P Ravi Prakash , S. Sai Kumar
Edge detection is the process of segmenting an image by detecting discontinuities in brightness. So far, several standard segmentation methods have been widely used for edge detection. However, due to inherent quality of images, these methods prove ineffective if they are applied without any preprocessing. In this paper, an image preprocessing approach has been adopted in order to get certain parameters that are useful to perform better edge detection with the standard edge detection methods. The proposed preprocessing approach involves median filtering to reduce the noise in image and then Edge Detection technique is carried out. And atlast Standard edge detection methods can be applied to the resultant preprocessing image and its Simulation results are show that our preprocessed approach when used with a standard edge detection method enhances its performance.
Volume: 7
Issue: 5
Page: 2574-2580
Publish at: 2017-10-01

Link Aggregation Control Protocol on Software Defined Network

10.11591/ijece.v7i5.pp2706-2712
L. D. Irawati , Y. Sun Hariyani , S. Hadiyoso
A physical connection of computer network must be made reliably. Breaking connection will cause communication between nodes (for example routers, switches, hosts) can be disconnected. One of the solutions is implemention of link aggregation (LA). LA integrates several of physical ports together to make a single logical communication link. Accordingly, there is load sharing traffic among the member port of the group, high-throughput increasing via a single link, and redundancy providing for broken links. We present the implementation of link aggregation using Ryu controller on Software Defined Network (SDN) topology. The results show that the implementation of SDN with OpenvSwitch and Ryu controller can successfully run link aggregation function to solve the problem of link failure.
Volume: 7
Issue: 5
Page: 2706-2712
Publish at: 2017-10-01

Accurate Symbolic Steady State Modeling of Buck Converter

10.11591/ijece.v7i5.pp2374-2381
Eko Setiawan , Takuya Hirata , Ichijo Hodaka
Steady state analysis is fundamental to any electric and electronic circuit design. Buck converter is one of most popular power electronics circuit and has been analyzed in various situations. Although the behavior of buck converters can be understood approximately by the well-known state space averaging method, little is known in the sense of detailed behavior or exact solution to equations. In this paper a steady state analysis of buck converter is proposed which allows the exact calculation of steady state response. Our exact solution is expressed as a Fourier series. Our result is compared with numerical calculation to be verified. Our method copes with more complicated problems such as describing average power and root-mean-square power that are most critical issues in power electronics circuit.
Volume: 7
Issue: 5
Page: 2374-2381
Publish at: 2017-10-01

LMS Adaptive Filters for Noise Cancellation: A Review

10.11591/ijece.v7i5.pp2520-2529
Shubhra Dixit , Deepak Nagaria
This paper reviews the past and the recent research on Adaptive Filter algorithms based on adaptive noise cancellation systems. In many applications of noise cancellation, the change in signal characteristics could be quite fast which requires the utilization of adaptive algorithms that converge rapidly. Algorithms such as LMS and RLS proves to be vital in the noise cancellation are reviewed including principle and recent modifications to increase the convergence rate and reduce the computational complexity for future implementation. The purpose of this paper is not only to discuss various noise cancellation LMS algorithms but also to provide the reader with an overview of the research conducted.
Volume: 7
Issue: 5
Page: 2520-2529
Publish at: 2017-10-01

Bit-error-rate Optimization for CDMA Ultra-wideband System Using Generalized Gaussian Approach

10.11591/ijece.v7i5.pp2661-2673
Chung Gwo Chin , Mohamad Yusoff Alias , Tiang Jun Jiat
Ultra-wideband is a wireless technology arisen for future high speed multimedia applications. It can provide data rate in excess of Gigabits per second by transmitting impulse signal through the free space. However, the ultra-wideband indoor channel models proposed by the IEEE P802.15.3a suffer long multipath propagation. Due to this multipath effect, several studies have been done to improve the bit-error-rate performance of the ultra-wideband system in the existence of severe interference. Yet, most of the proposed algorithms were formulated based on the Gaussian distribution, which is not true in ultra-wideband. In this paper, we first analyze the statistical behavior of the CDMA-UWB signal by applying the Kullback-Leibler divergence index. Based on the analysis, a non-Gaussian equalizer is developed by deriving an enhanced bit-error-rate optimization algorithm using the Generalized Gaussian approach. The proposed equalizer has been shown to achieve a performance gain of at least 1.5dB to 2dB over the other equalizers simulated under IEEE P802.15.3a channel models.
Volume: 7
Issue: 5
Page: 2661-2673
Publish at: 2017-10-01

Evaluation of Integrated Digital Forensics Investigation Framework for the Investigation of Smartphones Using Soft System Methodology

10.11591/ijece.v7i5.pp2806-2817
Ruuhwan Ruuhwan , Imam Riadi , Yudi Prayudi
The handling of digital evidence can become an evidence of a determination that crimes have been committed or may give links between crime and its victims or crime and the culprit. Soft System Methodology (SSM) is a method of evaluation to compare a conceptual model with a process in the real world, so deficiencies of the conceptual model can be revealed thus it can perform corrective action against the conceptual model, thus there is no difference between the conceptual model and the real activity. Evaluation on the IDFIF stage is only done on a reactive and proactive process stages in the process so that the IDFIF model can be more flexible and can be applied on the investigation process of a smartphone.
Volume: 7
Issue: 5
Page: 2806-2817
Publish at: 2017-10-01

Cable Test and Breakdown Voltage Determination of Joysense Cable Insulation

10.11591/ijeecs.v8.i1.pp177-183
Muhammad bin Yahya , Muhammad Nazrolni Azmi bin Izani
Cross-linked Polyethylene (XLPE) has been used as the insulation for polymeric power cables for its superior advantages. This type of cable insulation are famously known and used for their good dielectric properties, mechanical properties, thermal properties, and probability to be utilized at high temperature. This study is of four (4) parts; designing suitable method for cable test, accelerated testing procedures applied to XLPE insulation for high voltage cables, online partial discharge determination, and aging test. To study the insulation durability to AC high voltage operation, the breakdown strength and aging were investigated under different setting of temperature. The breakdown voltages of XLPE were measured at different temperatures of 300C, 500C and finally at 700C. Lastly, the aging effect of cable insulation was observed by conducting the AC breakdown voltage test after the aging process. Results showed that the breakdown voltage and aging of XLPE cables will decrease with increase of temperature setting. 
Volume: 8
Issue: 1
Page: 177-183
Publish at: 2017-10-01

Optimal Integration of the Renewable Energy to the Grid by Considering Small Signal Stability Constraint

10.11591/ijece.v7i5.pp2329-2337
I Made Wartana , Ni Putu Agustini , Jai Govind Singh
In recent decades, one of the main management’s concerns of professional engineers is the optimal integration of various types of renewable energy to the grid. This paper discusses the optimal allocation of one type of renewable energy i.e. wind turbine to the grid for enhancing network’s performance. A multi-objective function is used as indexes of the system’s performance, such as increasing system loadability and minimizing the loss of real power transmission line by considering security and stability of systems’ constraints viz.: voltage and line margins, and eigenvalues as well which is representing as small signal stability. To solve the optimization problems, a new method has been developed using a novel variant of the Genetic Algorithm (GA), specifically known as Non-dominated Sorting Genetic Algorithm II (NSGA-II). Whereas the Fuzzy-based mechanism is used to support the decision makers prefer the best compromise solution from the Pareto front. The effectiveness of the developed method has been established on a modified IEEE 14-bus system with wind turbine system, and their simulation results showed that the dynamic performance of the power system can be effectively improved by considering the stability and security of the system.
Volume: 7
Issue: 5
Page: 2329-2337
Publish at: 2017-10-01

Adaptive Angular-sector Segmentation Radar Target Recognition based on Grey System

10.11591/ijeecs.v7.i3.pp748-754
Xiao Yongsheng , Huang Lizhen , Zhou Jianjiang
The aspect sensitivity of high-resolution range profile (HRRP) leads to the anomalous change of the HRRP statistical characteristic, which is one of inextricable problems on the target recognition based on HRRP. Aiming at the HRRP statistical characteristic, an adaptive angular-sector segmentation method is proposed through based on the grey relational mode. Comparing to the equal interval angular-sector segmentation method, the new method improves the recognition performance. And these simulation results of five kinds of aircraft targets HRRPs prove the feasibility and validity.
Volume: 7
Issue: 3
Page: 748-754
Publish at: 2017-09-23

Software Aging Forecasting Using Time Series Model

10.11591/ijeecs.v7.i3.pp839-845
I M Umesh , G N Srinivasan , Matheus Torquato
With the emergence of virtualization and cloud computing technologies, several services are housed on virtualization platform. Virtualization is the technology that many cloud service providers rely on for efficient management and coordination of the resource pool. As essential services are also housed on cloud platform, it is necessary to ensure continuous availability by implementing all necessary measures.  Windows Active Directory is one such service that Microsoft developed for Windows domain networks. It is included in Windows Server  operating systems as a set of processes and services for authentication and authorization of users and computers in a Windows domain type network. The service is required to run continuously without downtime. As a result, there are chances of accumulation of errors or garbage leading to software aging which in turn may lead to system failure and associated consequences. This results in software aging. In this work, software aging patterns of Windows active directory service is studied. Software aging of active directory needs to be predicted properly so that rejuvenation can be triggered to ensure continuous service delivery. In order to predict the accurate time, a model that uses time series forecasting technique is built.
Volume: 7
Issue: 3
Page: 839-845
Publish at: 2017-09-23

Load Disturbance Rejection Based PID Controller for Frequency Regulation of a Microgrid

10.11591/ijeecs.v7.i3.pp625-642
Badal Kumar , Sandeep Bhongade
Today’s world is very much concerned to reduce green house gas emission from the conventional thermal power plants as cutting down emissions from transport and heating sector may not be realistic in the near future. To reduce pollution from electrical power sources, the world is now marching towards usage of renewable energy sources (RESs). These sources being small in capacity are mostly connected at the distribution voltage level. This indirectly reduces transmission and distribution losses as the sources are around the load. This distribution system having small scale energy sources is called as a microgrid or active distribution network. Microgrid operates generally in a grid connected mode. However, circumstances such as fault, voltage sag and large frequency oscillations in the main grid may force the active distribution network to be disconnected from the main grid and operate as an isolated microgrid . During this isolation there will be change in power output from the controllable microsources which are to be regulated properly to have a stable operation in regard to power balance and frequency of operation within the isolated microgrid. An autonomous isolated microgrid comprising both controllable & uncontrollable sources. Like solar, wind, diesel generator(DG), aqua electrolyzer(AE), fuel cell(FC),  a battery energy storage system(BESS), and fly wheel(FW) are considered. Solar, wind, DG and FC are power generating source & BESS, FW, AE as energy storage element. The generated hydrogen by an AE is used as fuel for a FC. The power system frequency deviates for the sudden change in load demand and the real power generation. The output power of DG,  FC, BESS, FW and power absorbed by AE is regulated by using controller such that frequency of the system is controlled. Controller used is proportional plus integral plus derivative (PID). Load Disturbance Rejection(LDR) is used for tuning of controller gains of the proposed hybrid system. This uses the chien-hornes-resnick(CHR) setting with 20% overshoot. Design of p-f droop(frequency regulation parameter) for different controllable source in microgrid using bode plot stability criterion. The system response with Modified LDR based controller, LDR based controller and classical controller are compared. Investigation shows that Modified LDR based controller gives best response amongst these three methods.
Volume: 7
Issue: 3
Page: 625-642
Publish at: 2017-09-08

The Adolescents Overview with Healthy Sexual Behavior in the Risky Environment

10.11591/ijere.v6i3.6040
Sitti Nur Djannah
Teens today have experienced a shift in morality, thought and behavior patterns because they are influenced by foreign cultures. This is due to lack of progress, especially in the field of transport and telecommunications that are spreading globally at youth culture. Negative attitudes towards adolescent health, such as sexual activity also tend to increase. Turonggo Wiro Budoyo (TWB) Wirobrajan Yogyakarta youth association which is a group of teenagers in the field of traditional dance, jathilan, is identified as a group of young adults at risk of premarital sex. They almost have a close friend (dating) and have intercourse, which is interesting to explore. There are five teenagers who can maintain a healthy sexual behavior. The purpose of research is to know the description of personal factors and external factors that influence adolescents to be able to retain healthy sexual behavior in a risky environment in TWB Yogyakarta youth association. Based on in-depth interviews with five teenagers who declares themselves not dating and a group leader community of TWB, it was shown that an overview that affects teens still behave in a healthy sex despite being in a risky environment is an overview of personal where young people have the ability to hold back emotions, ideals and religiosity attitudes, while the picture of the external consists of a family function where parents do remind norms and religion as well as the ability of adolescents to maintain away from the influence of friends to behave deviate.
Volume: 6
Issue: 3
Page: 221-226
Publish at: 2017-09-01

Contribution to the Improvement of the Performances of Doubly Fed Induction Machine Functioning in Motor Mode By the DTC Control

10.11591/ijpeds.v8.i3.pp1117-1127
Najib EL Ouanjli , Aziz Derouich , Abdelaziz El Ghzizal , Youness El Mourabit , Mohammed Taoussi
In this article, we are interested in the improvement of the performances of Doubly Fed Induction Machine (DFIM) operating in motor mode by the use of the direct torque control (DTC). Firstly, we focused on the modeling of the DFIM and the study of the principle of functioning of the DTC control. Then, we implement this control on the Matlab/Simulink environment. Secondly, we present the simulation results of the proposed control. The analysis of these results shows clearly that the system based on the DFIM studied follows perfectly the set points, what allowed us to justify the efficiency of the elaborate control.
Volume: 8
Issue: 3
Page: 1117-1127
Publish at: 2017-09-01
1 2 3
...
1788 1789
Show 1324 of 1789

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