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23,675 Article Results

A Novel Adaptive Congestion Avoidance Protocol for Wireless Sensor Networks

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2968
Mei-Wen Huang , Hsu-Jung Liu , Yu-Chang Chen , Wen-Shyong Hsieh
Most researches on wireless sensor networks (WSNs) are focused on how to save the energy of the sensor nodes. However, in some applications of WSNs, such as in the monitoring of an earthquake or a forest fire, it is much more important to transmit emergency data packets to the sink node as soon as possible than to save power. This paper proposes a novel Adaptive Congestion Avoidance Protocol (ACAP) model to provide a feasible WSNs architecture that will save the energy of the sensor nodes in the normal situation, but will transmit emergency data packets in an efficient manner to the sink node. The simulation analysis shows that the ACAP provides superior performance during both normal and emergency conditions. DOI: http://dx.doi.org/10.11591/telkomnika.v11i12.3710
Volume: 11
Issue: 12
Page: 7780-7786
Publish at: 2013-12-01

Effects of Barrier Parameter to Stochastic Resonance Signal-to-noise Ratio in Feature Extraction

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2886
Tang Xuxiang , Ju Chunhua
Effects of barrier parameter a to output signal-to-noise ratio (SNR) of bistable stochastic resonance in feature extraction was investigated in this paper. Barrier parameter a was changed with other systematic parameters fixed. The relationship between parameter aand the output SNR of non-linear stochastic resonance system was studied. This research provided us a novel way to extract the features using the non-linear stochastic resonance. DOI: http://dx.doi.org/10.11591/telkomnika.v11i12.3724
Volume: 11
Issue: 12
Page: 7146-7150
Publish at: 2013-12-01

Finite Element Modeling of Five Phase Permanent Magnet BLDC Motor for High Power Density Application

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4965
Kiran George , Shinoy K.S. , Sija Gopinathan
Fault-tolerant capability of electrical motor drives is an essential feature in applications such as automotive, aeronautic, and many others. A multi-phase permanent-magnet BLDC motor exhibits a high fault tolerant capability hence increasing the reliability, as it can be designed to reduce the fault occurrence as well as to operate indefinitely in the presence of fault. With multi independent phases, in the event of failure of one or more, the remaining healthy phases let the motor to operate properly. This paper presents finite element modeling and results of a five-phase permanent magnet brushless motor designed for high power density application.DOI: http://dx.doi.org/10.11591/ijpeds.v3i4.4184
Volume: 3
Issue: 4
Page: 384-390
Publish at: 2013-12-01

A Flow-based Distributed Intrusion Detection System Using Mobile Agents

https://ijece.iaescore.com/index.php/IJECE/article/view/5407
Zahra Hakimi , Karim Faez , Morteza Barati
In recent decade, computer networks have grown in popularity. So, network security measures become highly critical to protect networks against different kind of cyber attacks. One of the security measures is using intrusion detection system (IDS). An IDS aims to detect behaviors that compromise network integrity, availability and confidentiality, by continuously capturing and analyzing events occurring in the network. A challenging problem for current IDSs is that their performance decreases in today’s high speed and large scale networks. A centralize IDS cannot process such high volume of data and there is a high possibility that it discards some attacks. In this paper we propose a flow-based distributed IDS using mobile agents (MA), which performs both data capturing and data analyzing in a distributed fashion. Our distributed IDS provides a framework for deployment of a scalable and high performance IDS, which by using a grouping mechanism and help of mobile agents, effective collaboration can be established between all network members. We simulated our method in NS2. Then we compared our proposed system with a general network-based IDS and a distributed IDS. Experimental results showed its superiority using several metrics of network load, detection rate and flow loss rate.DOI:http://dx.doi.org/10.11591/ijece.v3i6.3936
Volume: 3
Issue: 6
Page: 732-740
Publish at: 2013-12-01

The Application of ElGamal Encryption Technology to the Information Security of Digital Library

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2918
Zhang Fu jun
Nowadays, the construction and application of digital library leads a new era of the way people obtain knowledge and information, and promotes the academic exchanges and social progress. Digital library, however, also involves great risk, hacker attacks become the main threat of the information security of digital library, and may probably cause the loss and damage of the information resources in library. This article mainly introduces the advantages and the potential safety hazard of digital library, and then makes an analysis aiming at the information security of digital library, and finally puts forward an algorithm based on ElGamal encryption to protect library information encryptedly, and effectively guarantee the information security of digital library. DOI: http://dx.doi.org/10.11591/telkomnika.v11i12.3937
Volume: 11
Issue: 12
Page: 7386-7391
Publish at: 2013-12-01

Application of Piezoelectric Materials in Smart Roads and MEMS, PMPG Power Generation with Transverse Mode Thin Film PZT

https://ijece.iaescore.com/index.php/IJECE/article/view/5437
Aqsa Abbasi
Due to the increase in electricity energy consumption and the fact that about 90 % of fuels being used now are co2 pollutant and the crisis has been caused by greenhouse gases have made moving toward renewable energies unavoidable. At present, considering electricity crisis in Pakistan, although only 46% of the population of Pakistan have the facility of electricity and the remaining are still living in darkness but still we face a major power crisis. Modern technology needs a huge amount of electrical power for its various operations. Electricity production is the single largest source of pollution in the whole world.  In this paper, we have presented and reviewed a method to produce pollution free electricity by some techniques like Piezoelectric effect in some specisl crystal such as pyroelectric crystal, Quartz crystal, PZT and using them in piezoelectric roads, as congestion on roads is becoming inevitable with the fancy of masses towards personal transportation systems for their growing mobility. Accordingly, it is an object of the present invention to provide a method of electrical power generation that does not negatively impact the environment.DOI:http://dx.doi.org/10.11591/ijece.v3i6.4588
Volume: 3
Issue: 6
Page: 857-862
Publish at: 2013-12-01

Optimal Pricing Strategies and Computer Simulation of DCSC with Fairness Preference and Risk-Aversion Members

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2951
Guangxing Wei , Qiang Lin
Firstly, this paper develop a basic two-echelon DCSC model as the comparative benchmark in the general case of the stochastic demand effected by the service level of the retailer, where the manufacturer's optimal direct price, wholesale price and the retailer's optimal retail price were achieved under Stackelberg game. Then, through incorporate the fairness preference and risk-aversion characteristics into the basic DCSC model, the manufacturer's optimal direct price, wholesale price and the retailer's optimal retail price were obtained under Stackelberg game. At last, by the numerical simulation, the effect of fairness preference and risk aversion level on the optimal pricing strategies and utility of DCSC was examined respectively. The results show that for a DCSC with fairness preference and risk aversion members, the manufacturer and the retailer will choose a reduced price to avoid income risk even if the market demand is stable. Although the decision makers can realize the improvement of their own utility in some circumstances, the utility of the whole supply chain always presents decreasing.  DOI: http://dx.doi.org/10.11591/telkomnika.v11i12.3686
Volume: 11
Issue: 12
Page: 7640-7648
Publish at: 2013-12-01

Maximum Power Point Tracking Algorithms for Grid-Connected Photovoltaic Energy Conversion System

10.11591/ijpeds.v3.i4.pp424-437
J.Surya Kumari , Ch. Saibabu
As the use of energy is increasing, the requirements for the quality of the supplied electrical energy are more tighten. Energy is the most basic and essential of all resources.  As conventional sources of energy are rapidly depleting and the cost of energy is rising, photovoltaic energy becomes a promising alternative source. Photovoltaic (PV) generation is becoming increasingly important as a renewable source since it exhibits a great many merits such as cleanness, little maintenance and no noise. The output power of PV arrays is always changing with weather conditions, i.e., solar irradiation and atmospheric temperature. Therefore, a Maximum Power Point Tracking (MPPT) control to extract maximum power from the PV arrays at real time becomes indispensable in PV generation system. In recent years, a large number of techniques have been proposed for tracking the maximum power point (MPP). MPPT is used in photovoltaic (PV) systems to maximize the photovoltaic array output power, irrespective of the temperature and radiation conditions and of the load electrical characteristics the PV array output power is used to directly control the dc/dc converter, thus reducing the complexity of the system. The resulting system has high-efficiency. This paper presents in details comparison  of most popular MPPT algorithms techniques which are Perturb & Observe algorithm(P&O) and Improved Perturb & Observe algorithm(IPO). Improved Perturb & Observe algorithm (IPO), is a very promising technique that allows the increase of efficiency and reliability of such systems. Modeling and designing a PV system with Improved Perturb & Observe algorithm (IPO) is remarkably more complex than implementing a standard MPPT technique. In this paper, Improved Perturb & Observe algorithm (IPO), system for PV arrays is proposed and analyzed.
Volume: 3
Issue: 4
Page: 424-437
Publish at: 2013-12-01

A Multi-core Heterogeneous Programmable Automation Controller System of Construction Machine

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2897
WANG Guoqing , YE Hong , Qu Jin , YANG Huaxin , LIU Chenghuan
There are two main issues, high cost and interrupt response delay for current PACs (programmable automation controllers) which are using high frequency single-chip microprocessors and commercial RTOS (real-time operating system) working by switching the tasks and interrupts. To solve these problems, a new low-cost multi-core heterogeneous PAC structure was proposed. Based on the traditional front-end of interrupt service without interrupt switching delay and the division & deployment of multi real-time tasks. We implemented a new programming language Engineer C including its syntax, compiler and an integrated development environment, which can dynamically divide the multi tasks and deploy the division to single low-cost microcontroller, then built the hardware prototype, which consists of a digital signal board, an analog signal board and a motion control board, every board has its microcontroller and communicates each other by an enhanced SPI bus. Testing results show the hardware prototype and IDE can be provided as a low-cost PAC solution for construction machine. DOI: http://dx.doi.org/10.11591/telkomnika.v11i12.3802
Volume: 11
Issue: 12
Page: 7230-7234
Publish at: 2013-12-01

Investigation on the Sensitivity Distribution in Electrical Capacitance Tomography System

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2878
Pan Jiang , Shidong Fan , Ting Xiong , Haofei Huang
The gas-solid-liquid three-phase flow is a very complicated flow pattern in pipeline transportation. By using electrical capacitance tomography (ETC) it can acquire the permittivity distribution of the multi-phase. The sensitivity distribution in ETC may affect the analysis of the permittivity distribution of the multi-phase. However, very limited work has been done in this issue. In order to investigate the sensitivity distribution in ETC, this paper employs the finite element method (FEM) to establish the principle and components of ECT. The FEM model of the sensitivity distribution as a function of the inter-electrode capacitance was discussed. Simulation tests were carried out to calculate the charge on the electrode pairs to access the potential distribution of the ETC. The analysis results show that the dielectric have great influence on the capacitance value and small distance between the electrode pair and the sensitivity field will produce high sensitivity value. Hence, the findings of this work can provide reference for the design of ECT in practice. DOI: http://dx.doi.org/10.11591/telkomnika.v11i12.3611
Volume: 11
Issue: 12
Page: 7088-7093
Publish at: 2013-12-01

Recommender System Based on Semantic Similarity

https://ijece.iaescore.com/index.php/IJECE/article/view/5412
Karamollah Bagheri Fard , Mehrbakhsh Nilashi , Mohsen Rahmani , Othman Ibrahim
In electronic commerce, in order to help users to find their favourite products, we essentially need a system to classify the products based on the user's interests and needs to recommend them to the users. For the same reason the recommendation systems are designed to help finding information in large websites. They are basically developed to offer products to the customers in an automated fashion to help them to do conveniently their shopping. The developing of such systems is important since there are often a large number of factors involved in purchasing a product that would make it difficult for the customer to make the best decision. Finding relationship among users and relationships among products are important issue in these systems. One of relations is similarity. Measure similarity among users and products is used in the pure methods for calculating similarity degree. In this paper, semantic similarity is used to find a set of k nearest neighbours to the target user, or target item. Thus, because of incorporating semantic similarity in the proposed recommendation system, from the experimental results, the high accuracy was obtained on private building company dataset in comparison with state-of-the-art recommender systems.DOI:http://dx.doi.org/10.11591/ijece.v3i6.3931
Volume: 3
Issue: 6
Page: 751-761
Publish at: 2013-12-01

Facial Image Verification and Quality Assessment System -FaceIVQA

https://ijece.iaescore.com/index.php/IJECE/article/view/5439
Omidiora E. O. , Olabiyisi S. O. , Ojo J. A. , Abayomi-Alli Adebayo , Abayomi-Alli O. , Erameh K. B.
Although several techniques have been proposed for predicting biometric system performance using quality values, many of the research works were based on no-reference assessment technique using a single quality attribute measured directly from the data. These techniques have proved to be inappropriate for facial verification scenarios and inefficient because no single quality attribute can sufficient measure the quality of a facial image. In this research work, a facial image verification and quality assessment framework (FaceIVQA) was developed. Different algorithms and methods were implemented in FaceIVQA to extract the faceness, pose, illumination, contrast and similarity quality attributes using an objective full-reference image quality assessment approach. Structured image verification experiments were conducted on the surveillance camera (SCface) database to collect individual quality scores and algorithm matching scores from FaceIVQA using three recognition algorithms namely principal component analysis (PCA), linear discriminant analysis (LDA) and a commercial recognition SDK. FaceIVQA produced accurate and consistent facial image assessment data. The Result shows that it accurately assigns quality scores to probe image samples. The resulting quality score can be assigned to images captured for enrolment or recognition and can be used as an input to quality-driven biometric fusion systems.DOI:http://dx.doi.org/10.11591/ijece.v3i6.5034
Volume: 3
Issue: 6
Page: 863-874
Publish at: 2013-12-01

Effect of Functionally Graded Material of Disc Spacer with Presence of Multi-Contaminating Particles on Electric Field inside Gas Insulated Bus Duct

https://ijece.iaescore.com/index.php/IJECE/article/view/5433
Mousa Awad Allah Abd Allah , Sayed Abo El Saood Ward , Amr Ameen Youssef
Solid insulators play a crucial role of electrical insulation in gas insulated power equipment. In order to improve the insulation performance of the solid insulators, two technical points should be considered, the first is the improvement of the insulation performance and the second is the control of the electric field distribution in and around the solid insulating spacers. Practically the insulation performance around the spacer can be improved by various techniques, such as; controlling the spacer shape, adding shield electrodes for electric field relaxation, the introduction of an embedded electrode, etc. These techniques lead to a more complicated structure of the equipment and increase the manufacturing cost. Thus, it is necessary to propose a new concept on solid spacers with keeping their simple structure and configuration. In this paper, a functionally graded material (FGM) is proposed to minimize the electric field distribution around the spacer, specially, on triple junction point, which was one of the important factors dominating a long-term insulating property of solid delectric. Finite Element Method (FEM) has been used throughout this work, for its favorable accuracy, to calculate the electric field distribution inside the bus duct. The Electric field distribution around earthed particle contamination which adhered to uniform and FGM of disc-spacer is presented. The effect of distance between particle and spacer on the electric field values is investigated. The effect of hemi-spherical radius and length of particle on maximum electric field at triple junction point is also discussed. Electric field relaxation effect (EFGM/Euniform) by introduction of the U-shape FGM spacer is also presented. The electric field distribution along the surface of FGM of disc spacer with presence of multi-contaminating particles at various positions is presented.DOI:http://dx.doi.org/10.11591/ijece.v3i6.4354
Volume: 3
Issue: 6
Page: 831-848
Publish at: 2013-12-01

Electric Control and Meterological Validation of Sensors in Dynamic Metering System of Fluids

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4973
Abdelkader Harrouz , Omar Harrouz , Ali Benatiallah
The verification method of a metering system varies from one site to another, depending on the available equipment and the calibration equipment measuring instruments installed. However, the effectiveness of the verification and control (primary or periodic) requires a good control system and calibration process. This paper focuses on the errors of measuring instruments in a dynamic system of metering fluids and respect of the tolerance defined by the international standards and recommendations. In a first step, we describe the experimental methodology adopted for evaluating the effectiveness of different systems Dynamic count. Next we will compare the results of measurements between the simulated values and the values read from the computer. Finally, we conclude on the validity of the instruments according to the errors identified and the errors.DOI: http://dx.doi.org/10.11591/ijpeds.v3i4.4979
Volume: 3
Issue: 4
Page: 450-458
Publish at: 2013-12-01

A Long-wire-connected and Multi-channel 3D Network-on-chip Design for Many-core System

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2877
Tan Hai , Shahnawaz Talpur , Amir Mahmood Soomro , Chen Hong Mao
To reduce traffic jam caused by various data competitions for channel, we present a low delay and energy efficient network-on-chip with three channels for different type's data. Hence, the transmission for control data between cores won’t be congested by the big amount of data transmitted from caches to core, and it achieves better performance in latency and energy. Our strategy is to make a directive long wire to connect two nodes in the same row or column, and distribute these connective wires to different layers which are connected by 3D stacking technology. In the many-core system applied with this topology, every pair of core-cache nodes are at most 5 hops away while real-time and short control information is transmitted by a 2D mesh network. The experimental results show up to 23% of network latency reduction and up to 15% energy reduction when compared to a 3D network-on-chip. DOI: http://dx.doi.org/10.11591/telkomnika.v11i12.2764
Volume: 11
Issue: 12
Page: 7081-7087
Publish at: 2013-12-01
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