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29,922 Article Results

Performance Evaluation of Broad Band CDMA Signal Using Beam Forming Antenna Technology for Next Generation Communications

10.11591/ijict.v4i2.pp45-55
Javaid A Sheikh
In order to accommodate various multimedia services, next generation wireless networks are characterized by very high transmission rates. Thus, in such systems and networks, the received signal is not only limited by noise like Additive White Gaussian noise (AWGN) but especially with increasing data transmission rate by the Intersymbol Symbol Interference (ISI) due to time dispersion of channel. A number of techniques such as rake receiver in CDMA systems and equalizers in GSM systems have been proposed to combat the effect of fading so as to improve the performance of wireless communication network.  In this paper we evolve the performance of uncoded uplink transmission in broadband CDMA using beam forming technique under multipath conditions. The beam-former has been implemented using Transport Delay Line (TDL) filters.  An expression for the optimal weights of a TDL based beam former has been derived.  A carrier frequency of 2 Ghz has been used in this work as they are useful for next generation wireless systems.  Simulation results show that TDL beamformer can reduce the multipath fading and Multiple Access Interferance (MAI). It has been shown that if SNR (related with Variance of the channel) is maintained at 10 db and if a 3 ray based beamformer having 3 antennas with 3 taps is used, the Error Rate of 0.1was found without using channel coding.
Volume: 4
Issue: 2
Page: 45-55
Publish at: 2015-08-01

Lip Image Feature Extraction Utilizing Snake’s Control Points for Lip Reading Applications

10.11591/ijece.v5i4.pp720-728
Faridah Faridah , Balza Achmad , Binar Listyana S
Snake is an active contour model that catches and locks image edges, then localizes them accurately. The simplest Snake consists of a set of control points that are connected by straight lines to form a closed loop. This paper discusses the application of Snake to find the visual feature of lip shapes. In most previous papers, visual feature of lip shapes is represented by Snake’s contour. In this paper, the feature of lip shapes is represented by six control points on lip Snake’s contours. By simply utilizing six control points representing one lip Snake’s contour, it is expected to reduce the burden on pattern recognition stage. To demonstrate the performance of this method, some analysis has been conducted on the effect of lip conditions and illumination. The results shows that the overall lip feature extraction using the proposed method is better for lips that have more contrast to the surrounding skin, optimum room illumination that gives the best result is in the range of 330-340 lux.
Volume: 5
Issue: 4
Page: 720-728
Publish at: 2015-08-01

One-Bit Hard Combination Decision Scheme for Cooperative Spectrum Sensing in Cognitive Radio

10.11591/ijict.v4i2.pp66-73
Md. Shamim Hossain , Md. Ibrahim Abdullah , Mohammad Alamgir Hossain
In this paper, the performance of 1-bit hard combination decision scheme for cooperative spectrum sensing in Cognitive Radio has been studied to maximize the probability of primary user detection. Energy detector model is used to observe the presence of primary user signal. Simulation result shows that the probability of missed detection is decreasing for both conventional and 1-bit hard combination OR rule with increasing the probability of false alarm correspondingly. It also has demonstrated that 1-bit hard combination decision scheme exhibits comparable performance with the conventional one-bit scheme and thus achieves a good tradeoff between performance and complexity.
Volume: 4
Issue: 2
Page: 66-73
Publish at: 2015-08-01

Security for Mobile Agents: Trust Estimate for Platforms

10.11591/ijeecs.v15.i2.pp381-389
Razouki Hassan , Hair Abdellatif
The mobile agent has been seen as a promising distributed computing technology. The mobility characteristic of mobile agent makes it to travel often in open network. In this scenario, it is obvious that the mobile agents are vulnerable to various security threats. Protecting free-roaming mobile agents from malicious host and from other mobile agents has drawn much attention in recent years. The protection of mobile agents is considered as one of the greatest challenges of security, because the platform of execution has access to all the components of the mobile agent. In this paper, we present a new architecture paradigm of mobile agents, which allows the separation of the implementation tasks of the agent and its security mechanisms. Our approach is based on using two strategies of adaptation to adapt the mobile agent security at runtime, depending on the sensitivity of the services required to perform the duties of the agent and the degree of confidence of the visited platforms.
Volume: 15
Issue: 2
Page: 381-389
Publish at: 2015-08-01

DSS using AHP in Selection of Lecturer

10.11591/ijict.v4i2.pp79-85
Adriyendi Adriyendi , Yeni Melia
This paper was conducted to apply Analytical Hierarcy Process (AHP), applied as Decision Support System (DSS) model in selection of lecturer at STAIN Batsangkar. Data collected by through observation and interview done in shares of administration academic data center at college. Here in  data analyzed to learn the pattern from method used and added with the reference from literature. Experiment done using Microsoft Excel and Expert Choice Software, known that method can yield the optimal decision in selection of lecturer. There by the method recommended to be applied to getting optimal result in decision making.
Volume: 4
Issue: 2
Page: 79-85
Publish at: 2015-08-01

Optimization of Economic Load Dispatch with Unit Commitment on Multi Machine

10.11591/ijape.v4.i2.pp47-60
Ranjeet Kumar , Rekha Jha , Ramjee Prasad Gupta
Economic load dispatch (ELD) and Unit Commitment (UC) are significant research applications in power systems that optimize the total production cost of the predicted load demand. The UC problem determines a turn-on and turn-off schedule for a given combination of generating units, thus satisfying a set of dynamic operational constraints. ELD optimizes the operation cost for all scheduled generating units with respect to the load demands of customers. The first phase in this project is to economically schedule the distribution of generating units using Gauss seidal and the second phase is to determine optimal load distribution for the scheduled units using dynamic programming method is applied to select and choose the combination of generating units that commit and de-commit during each hour. These precommitted schedules are optimized by dynamic programming method thus producing a global optimum solution with feasible and effective solution quality, minimal cost and time and higher precision. The effectiveness of the proposed techniques is investigated on two test systems consisting of five generating units and the experiments are carried out using MATLAB R2010b software. Experimental results prove that the proposed method is capable of yielding higher quality solution including mathematical simplicity, fast convergence, diversity maintenance, robustness and scalability for the complex ELD-UC problem.
Volume: 4
Issue: 2
Page: 47-60
Publish at: 2015-08-01

New Method of Content Based Image Retrieval based on 2-D ESPRIT Method and the Gabor Filters

10.11591/ijeecs.v15.i2.pp313-320
Chawki Youness , El Asnaoui Khalid , Ouanan Mohammed , Aksasse Brahim
We propose, in this paper, a new method for Content Based Image Retrieval (CBIR) by exploiting the digital image content. Our method is based on the representation of the digital image content by a characteristics vector of the indexed image. Indeed, we have exploited the image texture to extract its characteristics and for constructing a new descriptor vector by combining the Bidimensional High Resolution Spectral Analysis 2-D ESPRIT (Estimation of Signal Parameters via Rotationnal Invariance Techniques) method and Gabor filter. To evaluate the performance, we have tested our approach on Brodatz image database. The results show that the representation of the digital image content appears significant in research of imaging information.
Volume: 15
Issue: 2
Page: 313-320
Publish at: 2015-08-01

Integration of Solar Power Plant in Distribution Network

10.11591/ijece.v5i4.pp656-668
Srete N. Nikolovski , Predrag Ž. Marić , Ljubomir V. Majdandžić
This paper presents the integration of the solar power plant SE Gumiimpex, rated power of  1 MW in Croatian distribution network. Basic data of solar power plant are presented as well as the analysis of its impact on the distribution network. Power quality measurements, seven days before and seven days after the connection of PV plant to the grid are performed and obtained power quality indices are compared to those stated in the power quality standard HRN EN 50160/2012 and Croatian grid code. There are also presented results of the simulation of protection relays selection and coordination
Volume: 5
Issue: 4
Page: 656-668
Publish at: 2015-08-01

Impact of Buried Conductor Length on Computation of Earth Grid Resistance

10.11591/ijape.v4.i2.pp61-69
S. D. Buba , W. F. Wan Ahmad , Mohammed Z. A. Ab Kadir , C. Gomes , J. Jasni , M. Osman
Effective design of substation earth grid implies achieving low earth grid resistance and fulfillment of the safety criteria at the lowest possible cost. This paper presents an evaluation of IEEE Standard 80-2000 Equations 50 to 52 to determine the impact of buried conductor length on computation of earth grid resistance. Calculated results indicated that a saturation point is reached beyond which further addition of more conductor length does not significantly reduce the earth grid resistance but incurs more economic implications. These were validated by earth grids designed using CDEGS where good agreement between the calculated and simulated results was found.
Volume: 4
Issue: 2
Page: 61-69
Publish at: 2015-08-01

A Scalable Large Format Display Based on Zero Client Processor

10.11591/ijece.v5i4.pp714-719
Sang Don Kim , Seung Eun Lee
This paper proposes zero client module that targets Large  Format Display (LFD) system for display wall. Increased resolution in modern LFD requires a high bandwidth channel and a high performance display controller to transfer the image data to the monitor. The key idea is to use a Gagabit-Etherent communication based Daisy-Chain to transfer an image data. This communication supports sufficient bandwidth for image data transfer. As a result, we implement the LFD system using tha zero  client module and LFDmonitors.
Volume: 5
Issue: 4
Page: 714-719
Publish at: 2015-08-01

Design of Slotted and Slotless AFPM Synchronous Generators and their Performance Comparison Analysis by using FEA Method

10.11591/ijece.v5i4.pp810-820
Saint Saint Soe , Yan Aung Oo
Axial-flux permanent magnet machines are popular and widely used for many applications due to their attractive features such as light weight, low noise, high torque, robust and higher efficiency due to lack of field excitation. The main essence of this paper is to perform slotted and slotless axial-flux permanent magnet synchronous generator design based on theoretical sizing equations and then finite element analysis is reinforcement in order to get a more reliable and accuracy machine design. A comparative study of machine design and performances over the same rating but different configurations i.e., slotted and slotless are also discussed. And then, finite-element method (FEM) software was made for the slotted stator and slotless stator (AFPMSG) in order to compare their magnetic flux density and efficiency. The AFPMSG topology considered in this paper is a three-phase double-rotor single-stator topology with 16 pole-pairs, 2kW rated power and 188 rpm rated speed.
Volume: 5
Issue: 4
Page: 810-820
Publish at: 2015-08-01

Research on Roll Variable Speed Grinding Based on Adaptive Fuzzy Control

10.11591/ijeecs.v15.i2.pp284-293
Bi Junxi , Gao Qing , Wang Shuwei
The traditional method of improving the machining precision is mainly on account of changes in the workpiece and the grinding wheel in grinding process, including, considered the weakest of the workpiece from the axial stiffness, using center frame to increase the stiffness of the workpiece, take error compensation, and analyze the mechanism of gear grinding and the suppression measures of variable speed grinding and grinding chatter. Based on the analysis of the relationship among gear grinding mechanism, variable speed grinding and grinding chatter suppression and grinding precision, the variable speed micro-feed grinding process strategy based on adaptive fuzzy control is put up, that is according to the roller material and structure to reasonably determine the characteristics of grinding wheel and the parameters of grinding process. And with full consideration of roll grinders, changes of roller system along the axial stiffness and the deformation control in the roll grinding process, a new strategy of variable speed grinding micro-feed adaptive control optimization based on adaptive fuzzy control is proposed, which for improving the accuracy of the grinding roll presents a new and effective solution.
Volume: 15
Issue: 2
Page: 284-293
Publish at: 2015-08-01

Security against Timing Analysis Attack

10.11591/ijece.v5i4.pp759-764
Deevi Radha Rani , S Venkateswarlu
Timing attack is the type of side-channel attack involves the time taken to complete critical operations. Securing crypto processor from timing attack is critical issue. This paper implements the Bernstein’s Timing Attack and timing attack based on hamming weight. The countermeasures of Bernstein’s Timing attack are implemented in our experimental test bed and their performance is compared.  This paper also proposes the key recovery method based on timing attack using hamming weight of the key.
Volume: 5
Issue: 4
Page: 759-764
Publish at: 2015-08-01

Investigation of Dependent Rikitake System to Initiation Point

10.11591/ijape.v4.i2.pp70-76
Yousof Gholipour , Amin Ramezani , Mahmood Mola
In this paper we investigate depending of the Rikitake system to initiation point, and monitor changing behavior of this system. We will have 4 initiation points in Cartesian system. We at 4 positions, will monitor behavior of this system, while holding constant other values, and after per position, will draw operation of system on axes of x, y, z and 3-D plot. We want to know, what is the effect of initiation point on Rikitake system? Numerical simulations to illustrate the effect of initiation point are presented, and at the end conclusions and comparing the states together are obtained.
Volume: 4
Issue: 2
Page: 70-76
Publish at: 2015-08-01

Distributed MPP Tracking of PV through Buck Converter Using Fuzzy

10.11591/ijeecs.v15.i2.pp197-208
Chandani Sharma , Anamika Jain
Photovoltaics (PV) are the most abundant, perennial, environment friendly and distributed source of energy all over the globe. In this paper, the method to increase PV extraction efficiency for 60W panel with improved DMPP (Distributed Maximum Power Point) even on changing temperature and irradiance have been mapped and discussed. In order to achieve this, the components and subsystems have been analyzed and validated. The validated models are used to maximize the power output using two different models of DC-DC Converters in MATLAB/SIMULINK environment. Closed loop Buck converter using state space nonlinear differential equations and direct component model are compared to reveal best results at Standard Test Conditions (STC). MPPT model developed can be used for obtaining maximum power output from PV even in partial presence of sun using Fuzzy Logic Controller. The Controller designed tracks highest power output for the buck converter. The model developed, using tested membership functions in FLC, can serve a platform for various real time applications using PV.
Volume: 15
Issue: 2
Page: 197-208
Publish at: 2015-08-01
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