Articles

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

Filter Icon

Filters article

Years

FAQ Arrow
0
0

Source Title

FAQ Arrow

Authors

FAQ Arrow

28,188 Article Results

Barriers and Challenges to Telecardiology Adoption in Malaysia Context

10.11591/ijece.v7i1.pp260-265
Kee-Jiar Yeo , Lina Handayani , Haikal Satria , Shih-Hui Lee , Chia-Keat Yap
Mainly in infrastructure deficient communities, telecardiology is considered as a complement to insufficient cardiac care. Telecardiology can reduce travelling and waiting time, enables information sharing in shorter time and facilitate care in rural and remote areas. A qualitative study examined the perspectives of health care providers: cardiologist and general physician and health care service receivers: patient and public towards telecardiology adoption. The barriers in telecardiology adoption were identified in this paper. It includes practicality of telecardiology, the need of education for staffs and administrators, ease of use, preferred face-to-face consultation, cost and confidentiality. Improvements can be done by the implementers based on this study in order to promote telecardiology successfully in Malaysia. 
Volume: 7
Issue: 1
Page: 260-265
Publish at: 2017-02-01

Performance Evaluation of GaN based Thin Film Transistor using TCAD Simulation

10.11591/ijece.v7i1.pp144-151
Shashi Kant Dargar , J K Srivastava , Santosh Bharti , Abha Nyati
As reported in past decades, gallium nitride as one of the most capable compound semiconductor, GaN-based high-electron mobility transistors are the focus of intense research activities in the area of high power, high-speed, and high-temperature transistors. In this paper we present a design and simulation of the GaN based thin film transistor using sentaurus TCAD for the extracting the electrical performance. The resulting GaN TFTs exhibits good electrical performance in the simulated results, including, a threshold voltage of 12-15 V, an on/off current ratio of 6.5×107 ~8.3×108, and a sub-threshold slope of 0.44V/dec. Sentaurus TCAD simulations is the tool  which offers study of comprehensive behavior of semiconductor structures with ease. The simulation results of the TFT structure based on gallium nitride active channel have great prospective in the next-generation flat-panel display applications.
Volume: 7
Issue: 1
Page: 144-151
Publish at: 2017-02-01

A Three-Point Directional Search Block Matching Algorithm

10.11591/ijece.v7i1.pp230-237
A.V. Paramkusam , D. Laxma Reddy
This paper proposes compact directional asymmetric search patterns, which we have named as three-point directional search (TDS). In most fast search motion estimation algorithms, a symmetric search pattern is usually set at the minimum block distortion point at each step of the search. The design of the symmetrical pattern in these algorithms relies primarily on the assumption that the direction of convergence is equally alike in each direction with respect to the search center. Therefore, the monotonic property of real-world video sequences is not properly used by these algorithms. The strategy of TDS is to keep searching for the minimum block distortion point in the most probable directions, unlike the previous fast search motion estimation algorithms where all the directions are checked. Therefore, the proposed method significantly reduces the number of search points for locating a motion vector. Compared to conventional fast algorithms, the proposed method has the fastest search speed and most satisfactory PSNR values for all test sequences.
Volume: 7
Issue: 1
Page: 230-237
Publish at: 2017-02-01

Performance Evaluation of Interactive Video Streaming over WiMAX Network

10.11591/ijece.v7i1.pp344-352
Sanam Narejo , Farzana Kulsoom , M. Moazzam Jawaid
Nowadays, the desire of internet access and the need of digital encodings have influenced quite a large number of users to access high quality video application. Offering multimedia services not only to the wired but to wireless mobile client is becoming more viable. In wireless medium, video-streaming still has high resource requirements, for example, bandwidth, traffic priority, smooth play-backs. Therefore, bandwidth demands of these applications are far exceeding the capacity of 3G and Wireless Local Area Networks (LANs). The current research demonstrates the introductory understanding of the Worldwide Interoperability for Microwave Access (WiMax) network, applications, the mechanisms, its potential features, and techniques used to provide QoS in WiMAX, and lastly the network is simulated  to report the diverse requirements of streamed video conferencing traffic and its specifications. For this purpose two input parameters of video traffic are selected, i.e, refresh rate, which is monitored in terms of frames per second and pixel resolutions which basically counts the number of pixels in digital imaging. The network model is developed in OPNET. Different outcomes from simulation based models are analyzed and appropriate reasons are also discussed. Apart from this, the second aim of the current research is to address whether WiMAX access technology for streaming video applications could provide comparable network performance to Asymmetric Digital Subscriber Line (ADSL). For this purpose network metrices such as End to End delay and throughput is taken into consideration for optimization.
Volume: 7
Issue: 1
Page: 344-352
Publish at: 2017-02-01

Study of the Different Transmission Line Faults for a Grid Connected Wind Farm with Different Types of Control Method for RSC

10.11591/ijeecs.v5.i2.pp338-344
Reza Najafi
Wind power stations, many  located in remote areas; so they are characterized by weak grids and are often submitted to power system disturbance like faults. In this paper, the behaviour of a wind energy conversion system that uses the control of the rotor side converter (RSC) by three different methods  under faulty conditions is presented. The behaviour of these systems during a grid failure is an important issue.  DFIG is analysed and simulated under differing faulty conditions in the environment of MATLAB/SIMULINK. Simulation results show that the proposed method has proper operation during fault conditions. 
Volume: 5
Issue: 2
Page: 338-344
Publish at: 2017-02-01

STATCOM with Battery and Super Capacitor Hybrid Energy Storage System for Enhancement of Voltage Stability

10.11591/ijeecs.v5.i2.pp250-259
Tanneeru Renuka , Gattu Kesavarao
To maintain voltage stability of a power system STATCOM is better solution which can provide the required amount of reactive power under various disturbances. In previous work, STATCOM with various energy storage elements was discussed for voltage and power system stability. Apart from these previous works, this work proposes a new structure of hybrid energy storage system (HESS) for voltage stability by using battery and super capacitor. A new model of STATCOM with hybrid energy storage system is designed by using two bidirectional DC-DC converters and results are analyzed for conventional STATCOM and STATCOM with hybrid energy storage system. Results are also analyzed for STATCOM system with out any energy storage system, STATCOM with battery, STATCOM with super capacitor and STATCOM with HESS under sudden load changes by using MATLAB/Simulink.
Volume: 5
Issue: 2
Page: 250-259
Publish at: 2017-02-01

Research on the Transformation of User's Implicit Knowledge to Design Knowledge in Product Design

10.11591/ijeecs.v5.i2.pp243-249
Sun Qiang , Hu Fei
The characteristics of the user’s implicit knowledge in product design and the relationship between the user’s implicit knowledge and design knowledge are discussed. The transformation model of user implicit knowledge to design knowledge is built. And the key technologies of it are analyzed. The four design dimensions which the transformation from user implicit knowledge to design knowledge is based on are proposed, namely, the design process dimension, the design object dimension, the organization dimension and the knowledge dimension. Taking household cleaner as an example, this paper utilizes the oral analysis method and the semantic differential method to analyze the transformation of user implicit knowledge to design knowledge, and validates the conversion model. It is helpful for improving the computer aided industrial design and household appliance products network collaborative design.
Volume: 5
Issue: 2
Page: 243-249
Publish at: 2017-02-01

An Empirical Comparison of Latest Data Clustering Algorithms with State-of-the-Art

10.11591/ijeecs.v5.i2.pp410-415
Xianjin Shi , Wanwan Wang , Chongsheng Zhang
Over the past few decades, a great many data clustering algorithms have been developed, including K-Means, DBSCAN, Bi-Clustering and Spectral clustering, etc. In recent years, two new data  clustering algorithms have been proposed, which are affinity propagation (AP, 2007) and density peak based clustering (DP, 2014). In this work, we empirically compare the performance of these two latest data clustering algorithms with state-of-the-art, using 6 external and 2 internal clustering validation metrics. Our experimental results on 16 public datasets show that, the two latest clustering algorithms, AP and DP, do not always outperform DBSCAN. Therefore, to find the best clustering algorithm for a specific dataset, all of AP, DP and DBSCAN should be considered.  Moreover, we find that the comparison of different clustering algorithms is closely related to the clustering evaluation metrics adopted. For instance, when using the Silhouette clustering validation metric, the overall performance of K-Means is as good as AP and DP. This work has important reference values for researchers and engineers who need to select appropriate clustering algorithms for their specific applications.
Volume: 5
Issue: 2
Page: 410-415
Publish at: 2017-02-01

OFDM System Performance Evaluation under Different Fading Channels and Channel Coding using Matlab Simulink

10.11591/ijeecs.v5.i2.pp260-266
Pratima Manhas , M.K Soni
Orthogonal Frequency Division Multiplexing (OFDM) is a form of Multicarrier Modulation (MCM) technique in which larger bandwidth is divided into parallel narrow bands each of which is modulated by different subcarriers. All the subcarriers are orthogonal to each other and hence it reduces the interference among various subcarriers. OFDM technique is an efficient modulation technique used in certain wired and wireless application. During transmission, the transmitted signal can travel from transmitter to receiver over multiple reflective paths in case of wireless communication system which results to multipath fading and produces variation in amplitude, phase and angle of the received signal. The signal which is transmitted from BTS (base transceiver station) may undergo multiple reflections from the buildings nearby, before reaching the mobile station. This paper discusses the performance of OFDM system using various fading channels and channel coding. The parameter which is known as Bit error rate (BER) is calculated for different fading channels (AWGN, Rayleigh and Rician) for different digital modulation (BPSK, QPSK and QAM) and Channel coding(linear/ Cyclic coding).The tool which is used to evaluate  the BER parameter is Matlab Simulink.
Volume: 5
Issue: 2
Page: 260-266
Publish at: 2017-02-01

Media Access Control in Wireless Sensor Networks using Priority Index

10.11591/ijeecs.v5.i2.pp416-426
Mallanagouda Patil , Rajashekhar C. Biradar
As the nodes in Wireless Sensor Networks (WSNs) have limited power, energy conservation is essential at different layers of the protocol stack to prolong lifetime. In our previous work, ”Priority based slot allocation for media access in wireless sensor networks” (PSAWSN), probability based priority scheme is used to allocate slots to competing nodes. Limitations of this work include 1) It does not handle dynamic and variable slot allocation based on varying requirements of nodes. 2) Error control is not taken into account. To overcome these limitations, we propose a Medium Access Control scheme using Priority Index (MACPI) that generates Priority Index (PI) to allocate varying slots based on parameters: message length (ML), node energy (NE), number of requests (NR) and message urgency (MU). Models have been de- signed for all these parameters and an expert system is proposed that makes decisions based on collective knowledge of these parameters. Analysis and simulation results for various message sizes and error conditions show that there is an improvement in terms of energy efficiency, optimal message length and throughput compared to the ”Reliable data deliveries using packet optimization in multi-hop underwater sensor networks”(RDPSN).
Volume: 5
Issue: 2
Page: 416-426
Publish at: 2017-02-01

Performance Evaluation of Different Backoff Algorithms in IEEE 802.15.4 using Double Sensing

10.11591/ijeecs.v5.i2.pp376-382
Md. Mohibur Rahaman , Mohammad Khairul Islam , Kazi Ashrafuzzaman , Mohammad Sanaullah Chowdhury
The IEEE 802.15.4 is the standard for Low Rate Wireless Personal Area network (LR-WPAN). It is widely used in many application areas. The standard uses Slotted CSMA/CA mechanism in its contention access period (CAP) for the beacon enabled mode. The protocol has two modes - single sensing (SS) and double sensing (DS). The protocol also adopts a binary exponential backoff (BEB) algorithm. In this paper, we explore the saturation throughput, delay and energy consumption of this standard with double sensing (DS) using the existing BEB algorithm. We also investigate three other backoff schemes - exponential increase exponential decrease (EIED), exponential increase linear decrease (EILD) and exponential increase multiplicative decrease (EIMD). From simulation results, it is found that the EIED, EILD, EIMD perform better than the BEB for higher loads. It shows that the EIED, EILD, EIMD have better throughput and lower delay than the BEB. The EIED outperforms the other schemes in terms of throughput, delay and energy for the higher loads.
Volume: 5
Issue: 2
Page: 376-382
Publish at: 2017-02-01

Video Watermarking Scheme Based on Candidates I-frames for Copyright Protection

10.11591/ijeecs.v5.i2.pp391-400
Rakesh Ahuja , Dr. Sarabjeet Singh Bedi
This paper focuses on moving picture expert group ( MPEG) based digital video watermarking scheme for copyright protection services. The present work implemented the video watermarking technique in which discrete cosine transform (DCT) intermediate frequency coefficients from instantaneous decoder refresh (IDR) frames are utilized. The subset of IDR frames as candidate frames are chosen to reduces the probability of temporal synchronization attacks to achieve better robustness and high visual perceptual quality.  A secret key based cryptographic technique is used to enhance the security of embedded watermark. The proposed scheme embedded the watermark directly during the differential pulse code modulation (DPCM) process and extracting through decoding the entropy details. Three keys are required to extract the watermark whereas one of the key is used to stop the extraction process and the remaining two are used to display the watermark. The robustness is evaluated by testing spatial synchronization attacks, temporal synchronization attacks and re-encoding attacks. The present work calculates the simulation results that shows the watermarking scheme achieved high robustness against video processing attacks frequently occur in the real world and perceptibility also obtained without changing the motion vectors during the DPCM process of MPEG-2 encoding scheme.
Volume: 5
Issue: 2
Page: 391-400
Publish at: 2017-02-01

Telecommunication Numbering System Roadmap towards Next Generation Network Era in Indonesia

10.11591/ijeecs.v5.i2.pp363-375
Maman Abdurohman , Bambang Setia Nugroho , Aji Gautama Putrada
The telecommunication numbering system in Indonesia currently complies to the International TelecommunicationUnion (ITU) standard, that is ITU-T E.164. In accordance to both technology development and the growing of network users, ITU has also been designing future infrastructure network concept, namely Next Generation Network Infrastructure (NGNI). In its technical paper, ITU discusses future generation’s specification as well as current network migration scenarios towards Next Gereration Network (NGN) in developing countries and its impact on regulations, business processes, and the numbering system. The scenario described in the concept is yet universal and the implementation would be highly depending on the conditions of ones country. This paper proposes the roadmap of numbering system from the current state into NGN numbering for the case of Indonesia. The method used in this paper are benchmarking with several countries that have started with the transformation process, forecasting with regression method based on the existing trends and descriptive analysis. This paper has proposed the stages of numbering roadmap towards NGN numbering system, the achievement parameters, and the indicators that are suitable for Indonesia.
Volume: 5
Issue: 2
Page: 363-375
Publish at: 2017-02-01

A Control Strategy for DFIM to Minimize DC Bus Voltage Fluctuations and Torque Oscillations

10.11591/ijeecs.v5.i2.pp277-289
G. Venu Madhav , Y. P. Obulesu
The Direct Power Contro; has many advantages like it avoids the usage of integration of PWM voltages which leads to stable operation even at zero rotor frequency, it is position sensor less and hence will not depend on machine parameters like stator or rotor resistance. In case of network unbalance, if the system is operated with constant active and reactive powers, it leads to oscillations in the electromagnetic torque and currents exchange with the grid will become non- sinusoidal, which is not good for the system as it increases the mechanical stress. In this paper, both the rotor connected converter and grid connected converter are fed with DPC strategy along with that a Torque Oscillations Cancellation scheme is applied to RSC and Proportional Integral control based power references generation strategy without calculating the sequence components and with elimination of DC bus voltage oscillations is applied to stator-side converter in order to achieve non-oscillating torque accompanied by quality improved current exchange with the grid. The simulation results of Doubly Fed Induction Generator with and without fault clearly shows that the performance of the proposed scheme is validated.
Volume: 5
Issue: 2
Page: 277-289
Publish at: 2017-02-01

A Blind Identification and Equalization for MC-CDMA Transmission Channel using a New of Adaptive Filter Algorithm

10.11591/ijeecs.v5.i2.pp352-362
ATIFY Elmostafa , Cherki Daoui , Ahmed BOUMEZZOUGH
A review of literature shows that there are a variety of adaptive filters. In this research study, we propose a new type of adaptive filter that increases the diversification used to compensate the channel distortion effect in the MC-CDMA transmission. First, we show expressions of the impulse responses of the filter in the case of a perfect channel. The adaptive filter  was simulated was experienced by blind equalization for different cases of Gaussian white noise in the case of an MC-CDMA transmission  with orthogonal frequency baseband for mobile radio downlink channel Bran A. Simulation Results  of the proposed model shows the performance of the identification and blind equalization algorithm for MC-CDMA transmission chain using IFFT.
Volume: 5
Issue: 2
Page: 352-362
Publish at: 2017-02-01
Show 1478 of 1880

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