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29,905 Article Results

Analysis of IEEE 802.15.4 Beacon-Enabled MAC Protocol

10.11591/ijece.v6i3.pp1122-1132
Nga Dinh , Sangsoon Lim
This paper aims to develop several mathematical models to study medium access control (MAC) protocol in the IEEE 802.15.4 beacon-enabled mode with star topology. In particular, the MAC protocol which employs a slotted carrier-sense multiple access with collision avoidance (CSMA/CA) algorithm used in the contention access period (CAP) of a superframe is modelled. The analysis studies the effectiveness of the CSMA/CA algorithm and provides explicit mathematical expressions for power consumption, access delay, and data frame drop probability. The proposed models precisely follow CSMA/CA algorithm in MAC protocol of beacon-enabled mode and differ from those previously published in the literature as 1) they are derived based on data frame generation rate of end devices, 2) they provide a completed expression for frame access delay, and 3) lowpower states of end devices are considered for power efficiency evaluations. The paper shows how power consumption of end devices is improved on the balance with data frame delay. The validity of the proposed models is confirmed and complemented by extensive simulations.
Volume: 6
Issue: 3
Page: 1122-1132
Publish at: 2016-06-01

Direct Instantaneous Power Control of Three-level Grid-connected

10.11591/ijece.v6i3.pp1260-1273
Yang Yong
Power electronic grid-connected inverters are widely applied as grid interface in renewable energy sources. This paper presents direct instantaneous power control of a three-phase three-level Neutral Point Clamped (NPC) grid-connected inverter in photovoltaic generation systems. The system consists of a PV array, DC/DC converter, three-level NPC LC filter and the grid. In order to achieve maximum power point  tracking (MPPT), an adaptive perturb and observe MPPT is used. For balancing the neutral point (NP) voltage, the control scheme through proportional integral (PI) control according to  the direction of the NP current based on redundant vector selection is used. Direct instantaneous power control is developed in a rotating synchronous dq reference frame with space vector modulation with improved operation performance study of the positive sequence detector (PSD) plus a synchronous a synchronous reference frame phase-locked loop (PLL) as the synchronization method. The performance of the proposed method is investigated by a grid-connected photovoltaic system with a nominal power of 12kW. The feasibility of the proposed method is verified through experimental results, showing good steady-state and dynamic performance.
Volume: 6
Issue: 3
Page: 1260-1273
Publish at: 2016-06-01

Performance Evaluation of Modelling and Simulation of Lead Acid Batteries for Photovoltaic Applications

10.11591/ijpeds.v7.i2.pp472-480
A. Selmani , A. Ed-Dahhak , M. Outanoute , A. Lachhab , M. Guerbaoui , B. Bouchikhi
Lead-acid batteries have been the most widely used energy storage units in stand-alone photovoltaic (PV) applications. To make a full use of those batteries and to improve their lifecycle, high performance charger is often required. The implementation of an advanced charger needs accurate information on the batteries internal parameters. In this work, we selected CIEMAT model because of its good performance to deal with the widest range of lead acid batteries. The performance evaluation of this model is based on the co-simulation LabVIEW/Multisim. With the intention of determining the impact of the charging process on batteries, the behaviour of different internal parameters of the batteries was simulated. During the charging mode, the value of the current must decrease when the batteries’ state of charge is close to be fully charged.
Volume: 7
Issue: 2
Page: 472-480
Publish at: 2016-06-01

Machine Learning Techniques on Multidimensional Curve Fitting Data Based on R- Square and Chi-Square Methods

10.11591/ijece.v6i3.pp974-979
Vidyullatha P , D. Rajeswara Rao
Curve fitting is one of the procedures in data analysis and is helpful for prediction analysis showing graphically how the data points are related to one another whether it is in linear or non-linear model. Usually, the curve fit will find the concentrates along the curve or it will just use to smooth the data and upgrade the presence of the plot. Curve fitting checks the relationship between independent variables and dependent variables with the objective of characterizing a good fit model. Curve fitting finds mathematical equation that best fits given information. In this paper, 150 unorganized data points of environmental variables are used to develop Linear and non-linear data modelling which are evaluated by utilizing 3 dimensional ‘Sftool’ and ‘Labfit’ machine learning techniques. In Linear model, the best estimations of the coefficients are realized by the estimation of R- square turns in to one and in Non-Linear models with least Chi-square are the criteria. 
Volume: 6
Issue: 3
Page: 974-979
Publish at: 2016-06-01

Special features of radio interception of APCO P25 messages in Russia

10.11591/ijece.v6i3.pp1072-1076
Dmitry Sergeevich Silnov
Many special forces in Russia use APCO P25 encoding while radio talks. Using google speech or yandex speechkit while decoding radio talks can give huge advantage. Search engines can index decoded text or knowledge base can be created.
Volume: 6
Issue: 3
Page: 1072-1076
Publish at: 2016-06-01

Delay Comparison for 16x16 Vedic Multiplier Using RCA and CLA

10.11591/ijece.v6i3.pp1205-1212
M. Bhavani , M. Siva Kumar , K. Srinivas Rao
In any integrated chip compulsory adders are required because first they are fast and second are the less power consumption and delay. And at the same time multiplication process is also used in various applications. So as the speed of multiplier increases then the speed of processor also increases. And hence we are proposing the Vedic multiplier using these adders. Vedic multiplier is an ancient mathematics which uses mainly 16 sutras for its operation. In this project we are using “urdhva triyagbhyam” sutra to do our process. This paper proposes the Vedic multiplier using the adders ripple carry adder(RCA) and carry look ahead adder(CLA) and puts forward that CLA is better than RCA.The major parameters we are simulating here are number of slices and delay. The code is written by using Verilog and is implemented using Xilinx ISE Design Suite.
Volume: 6
Issue: 3
Page: 1205-1212
Publish at: 2016-06-01

Modelling the Effect of Applied Voltage and Frequency on Electroluminescence in Polymeric Material

10.11591/ijece.v6i3.pp1375-1384
N.A. Bani , Z Abdul-Malek , F Muhammad-Sukki , A Abubakar Mas’ud , M.N. Muhtazaruddin , K Kamardin , J.J. Jamian , H Ahmad
Electroluminescence method has been used by several researchers to observe the behaviour of an aged polymeric material. Electroluminescence is a phenomenon that occurs when the atoms of a material are being excited due to the application of and external high electrical stresses. The changes in the energy level of these excitation states can be used as an indicator for the initiation of electrical ageing. There are several factors that affect the behaviour of electroluminescence emission such as, among others, applied voltage, applied frequency, ageing of material and types of materials and gases used are discussed in this paper. A mathematical approach relating these factors and the intensity of electroluminescence is proposed through the aid of Dimensional Analysis method. A close relationship is obtained between experimental and simulation that suggests this mathematical approach can be utilized as a tool to predict electrical ageing of insulation material.
Volume: 6
Issue: 3
Page: 1375-1384
Publish at: 2016-06-01

Multi-objective Optimization Based Design of High Efficiency DC-DC Switching Converters

10.11591/ijpeds.v7.i2.pp379-386
Angelo Ambrisi , Massimiliano de Magistris , Raffaele Fresa
In this paper we explore the feasibility of applying multi objective stochastic optimization algorithms to the optimal design of switching DC-DC converters, in this way allowing the direct determination of the Pareto optimal front of the problem. This approach provides the designer, at affordable computational cost, a complete optimal set of choices, and a more general insight in the objectives and parameters space, as compared to other design procedures. As simple but significant study case we consider a low power DC-DC hybrid control buck converter. Its optimal design is fully analyzed basing on a Matlab public domain implementations for the considered algorithms, the GODLIKE package implementing Genetic Algorithm (GA), Particle Swarm Optimization (PSO) and Simulated Annealing (SA). In this way, in a unique optimization environment, three different optimization approaches are easily implemented and compared. Basic assumptions for the Matlab model of the converter are briefly discussed, and the optimal design choice is validated “a-posteriori” with SPICE simulations.
Volume: 7
Issue: 2
Page: 379-386
Publish at: 2016-06-01

Polyhouse Agricultural Marketing System Using Big Data Hadoop

10.11591/ijaas.v5.i2.pp78-84
Ayesha Bhandralia , Resham Arya , S. N. Panda , Sachin Ahuja
Agriculture is to cultivate and produce crops and livestock products. Agriculture in its associated sectors is unquestionably the largest livelihood provider, in the broad areas of rural India. With the emergence of high tech agriculture farming known as Polyhouse farming came into existence. Polyhouse farming is an alternative new technique which reduces clinging on to natural procedures that are very basic needs of agriculture i.e. rainfall, temperature, humidity and geographical conditions and this result in the most advantageous use of water and land resources. Polyhouse advances to create suitable microclimates, which favour the crop production by simulation of artificial environment using latest computer assisted technology. Yet polyhouse product marketing is an uncovered area which is still neglected and there is a strong need to for an effective marketing intervention or channelization. The liberalized trade environment in general has added another dimension to the poverty of farmers and uncertainty about the future. The paper describes the long established approach of marketing concept of polyhouse agriculture. The relationship between development, marketing and accessibility in polyhouse agriculture is reviewed. We have detected various inadequate parameters, and recognized the need of an effective polyhouse marketing system which may have beneficial impact on farmers.
Volume: 5
Issue: 2
Page: 78-84
Publish at: 2016-06-01

Proximate Composition of Some Selected Browse Plants in Gombi Local Government Area, Adamawa State, Nigeria

10.11591/ijaas.v5.i2.pp72-77
D.I. Mojaba , D. Khobe , E Nelson
Twelve (12) indigenous browse plants harvested from four districts of Gombi Local Government, Adamawa State were evaluated for their proximate composition. The samples were randomly collected in the study and identified at the Forestry Department, Ministry of Agriculture, Adamawa State. The proximate composition of the collected samples was carried out at the Animal production Nutrition Laboratory of Adamawa University, Mubi. Parameters measured include dry matter (DM), crude fibre (CF), crude protein (CP), Ash (minerals). Nitrogen free extract (NFE) and ether extract (EE). Results obtained showed that DM ranged from 55.5%-80%, CF (23-68%), CP (7.88-19.25%), NFE (22.25-69.97%), EE (3.0-6.0%) and Ash (6.0-12.00%). The data obtained were used to determine the suitability of the browse plants species for ruminant animal production. Results revealed that nutrient contents in plant samples vary in composition.
Volume: 5
Issue: 2
Page: 72-77
Publish at: 2016-06-01

A Study on Big Data Techniques and Applications

10.11591/ijaas.v5.i2.pp101-108
K. Radha , B. Thirumala Rao
We are living in on-Demand Digital Universe with data spread by users and organizations at a very high rate. This data is categorized as Big Data because of its Variety, Velocity, Veracity and Volume. This data is again classified into unstructured, semi-structured and structured. Large datasets require special processing systems; it is a unique challenge for academicians and researchers. Map Reduce jobs use efficient data processing techniques which are applied in every phases of Map Reduce such as Mapping, Combining, Shuffling, Indexing, Grouping and Reducing. Big Data has essential characteristics as follows Variety, Volume and Velocity, Viscosity, Virality. Big Data is one of the current and future research frontiers. In many areas Big Data is changed such as public administration, scientific research, business, The Financial Services Industry, Automotive Industry, Supply Chain, Logistics, and Industrial Engineering, Retail, Entertainment, etc. Other Big Data applications are exist in atmospheric science, astronomy, medicine, biologic, biogeochemistry, genomics and interdisciplinary and complex researches.  This paper is presents the Essential Characteristics of Big Data Applications and State of-the-art tools and techniques to handle data-intensive applications and also building index for web pages available online and see how Map and Reduce functions can be executed by considering input as a set of documents. 
Volume: 5
Issue: 2
Page: 101-108
Publish at: 2016-06-01

Study on End-wall Slope Stability of Surface Coal Mine under the Condition of Combined Open-pit Mining with Underground Mining

10.11591/ijaas.v5.i2.pp65-71
Peng Hongge , Cai Qingxiang , Zhou Wei , Shu Jisen
With the deepening of surface coal mine, the application of combined surface mining with underground mining is increased now. According to the influence analysis of underground mining on surface coal mine end-wall slope, the thin plate model of mined slope was proposed with distortion and stress distribution of the girder studied. Considering the practice of combined surface mining with underground mining, the modified method was put forward. Based on the roof breaking law of mined slope, the minimum width of protecting coal pillar was elicited. Subsequently this paper took the combined mining practice of Anjialing surface mine as example to study the subsidence law of roof and the influence of underground mining to surface mine slope. The research conclusion indicates that under the condition of combined mining the deformation and subsidence of overlying strata are obvious with a clear lag time, and the ceiling distortion evokes distortion of mined slope, which can be used as the theory sustainment to stabilization of mined slope under combined surface mining with underground mining.
Volume: 5
Issue: 2
Page: 65-71
Publish at: 2016-06-01

Graphical Password Using Captcha

10.11591/ijaas.v5.i2.pp94-100
Y.Chandra Sekhar Reddy , M.Venkateswara Rao , M. Kameswara Rao , C.V. Phaneendra Kumar , A. Anil Sai
In this 21st century one of the main issue to tackle was Cyber Security attack. We have numerous authentication processes like two key factor passwords, graphical passwords and many other. Text based passwords are prone to many attacks like dictionary attacks. In this paper, we have implemented a new authentication method namely; a family of graphical passwords built on Captcha technology. As graphical password addresses many security problems like online guessing attacks, relay attacks etc. Captcha is used to distinguish humans and bots. So, we use images with captcha’s as one of the authentication step along with normal alpha-numeric password. It also overcome the problems of pass points in graphical password systems.
Volume: 5
Issue: 2
Page: 94-100
Publish at: 2016-06-01

A Physiologic Model for the Problem of Blood Flow through Diseased Blood Vessels

10.11591/ijaas.v5.i2.pp58-64
Sapna Ratan Shah , S. U. Siddiqui
This study focuses on the behavior of blood flow through diseased artery in the presence of porous effects. The laminar, incompressible, fully developed, non-Newtonian in an artery having axially non-symmetric but radially symmetric stenosis is numerically studied. Here blood is represented as Herschel-Bulkley fluid model and flow model is shown by the Navier-Stokes and the continuity equations. Using appropriate boundary conditions, numerical expression for volumetric flow rate, pressure drop and wall shear stress have been derived. The expressions are computed numerically and results are presented graphically. The effects of porous parameter on wall shear stress, stenosis length, stenosis size and stenosis shape parameter are discussed. The wall shear stress increases as the porous parameter, stenosis size and stenosis length increases, but as the stenosis shape parameter increases, the wall shear stress decreases. The work shows that the results obtained from the porous wall model are significantly different from those obtained by the rigid wall model.
Volume: 5
Issue: 2
Page: 58-64
Publish at: 2016-06-01

Weighted Rank Query Search over Cloud Data Storage

10.11591/ijaas.v5.i2.pp85-93
K.Naga Gopi , K. Thirupathi Rao , K. Chaitanya , R. Venkatesh
This paper describes and fixes the problem of multi-keyword rated look for over secured reasoning information (MRSE) while preserving strict system sensible comfort in the reasoning processing model. Information proprietors are roused to delegate their convoluted data administration frameworks from neighborhood destinations to the business open thinking for extraordinary flexibility and monetary advantages. Anyway, for safeguarding data solace, delicate data must be secured before outsourcing, which obsoletes traditional data use in light of plaintext essential word and key expression search for. To better bolster clients in their long haul data missions on the Web, Google stay informed concerning their worries and mouse snaps while seeking on the web. In this paper, we think about the issue of arranging a client's conventional concerns into gatherings in an intense and electronic style. In a flash deciding inquiry gatherings is useful for various distinctive online search for motor parts and projects, for example, question recommendations, result position, question alteration, sessionization, and community explore for. In our method, we depart past strategies to depend on literary resemblance or moment points of confinement, and we suggest a more compelling  technique that controls search for question logs.
Volume: 5
Issue: 2
Page: 85-93
Publish at: 2016-06-01
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