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  Citation statistics : Table of Contents
   2013| January-June  | Volume 3 | Issue 1  
    Online since February 12, 2013

 
 
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ARTICLES
An Improved Approach for the Global Positioning System Geometric Dilution of Precision Classification
Seyed Mahmoud Anisheh, Milad Malekzadeh, Morteza Saraf, Alireza Khosravi
January-June 2013, 3(1):1-5
DOI:10.4103/0976-8580.107094  
The effect of geometry on the relationship between measurement error and position determination error is described by geometric dilution of precision (GDOP). It is illustrated that a subset with lowest GDOP will result in lowest error. Since the global positioning system (GPS) GDOP computation based on complicated transformation and inversion of measurement matrices is a time consuming procedure, the neural network (NN) is used as an approximator or classifier for GDOP data. The back propagation (BP) is a most common method to train a feed-forward NN. However, in many applications including the GPS GDOP classification, it cannot train an NN with an acceptable speed and accuracy. Therefore, in this paper, a new approach to classify the GPS GDOP by using scaled conjugate gradient algorithm (CGA) to train a feed-forward NN and principal component analysis (PCA) is proposed. Scaled CGA is a powerful tool to train an NN, which is widely used in many applications that need to a high speed. PCA is a well-known method to reduce and optimize the dimensions of the data. PCA is applied on entire dataset in order to have some few uncorrelated and informative features. The results show that the scaled CGA with PCA has better performance than the scaled CGA without PCA and also, scaled CGA without PCA has better performance than the basic BP.
[ABSTRACT]   Full text not available  [PDF] [CITATIONS]
  6 1,262 476
Multi-Response Optimization of Electrical Process Parameters on Machining Characteristics in Electrical Discharge Machining Using Taguchi-Data Envelopment Analysis-Based Ranking Methodology
T Muthuramalingam, B Mohan
January-June 2013, 3(1):57-60
DOI:10.4103/0976-8580.107103  
Since electrical process parameters are determining the machining characteristics of electrical discharge machining (EDM), it is important to find the optimum values of those parameters and contribution of each parameter. As the process involves more than one response parameter, it is needed to implement the multi-response optimization methodology. AISI 202 stainless steel was selected as work piece material, whereas copper, brass, and tungsten carbide were selected as tool materials. The experiments were conducted with different levels of input factors such as gap voltage, discharge current, and duty factor based on L9 orthogonal table. The purpose of this study is to investigate the contribution of electrical process parameters on machining characteristics and optimal combination of those parameters using Taguchi-data envelopment analysis-based ranking method. From the results, it is revealed that electrical parameters have significant role in EDM process and the optimal values have been found using proposed multi-response methodology.
[ABSTRACT]   Full text not available  [PDF] [CITATIONS]
  6 975 296
A Research about Pattern Recognition of Control Chart Using Optimized ANFIS and Selected Features
Jalil Addeh, Ata Ebrahimzadeh, Habibeh Nazaryan
January-June 2013, 3(1):6-16
DOI:10.4103/0976-8580.107095  
Unnatural patterns in the control charts can be associated with a specific set of assignable causes for process variation. Hence pattern recognition is very useful in identifying process problem. This article introduces a novel hybrid intelligent system that includes three main modules: a feature extraction module, a classifier module, and an optimization module. In the feature extraction module, a proper set combining the shape features and statistical features is proposed as the efficient characteristic of the patterns. In the classifier module, adaptive neuro-fuzzy inference system (ANFIS)-based classifier is proposed. For the optimization module, cuckoo optimization algorithm (COA) is proposed to improve the generalization performance of the recognizer. In this module, it the ANFIS classifier design is optimized by searching for the best value of the parameter and looking for the best subset of features that feed the classifier. Simulation results show that the proposed algorithm has very high recognition accuracy (RA). This high efficiency is achieved with only little features, which have been selected using COA.
[ABSTRACT]   Full text not available  [PDF] [CITATIONS]
  1 1,202 456
Strengthening of Corroded Hollow Structural Steel Tubular Members Using Fibre Reinforced Polymer Fabrics: An Experimental Investigation
MC Sundarraja, P Sriram, G Ganesh Prabhu
January-June 2013, 3(1):17-22
DOI:10.4103/0976-8580.107096  
The main objective of this investigation is to experimentally investigate the suitability of carbon fibre reinforced polymer (CFRP) in strengthening artificially degraded hollow structural steel (HSS) tubular members. In order to obtain uniform corrosion, all the tubular columns were artificially degraded by heavier solution mechanism. CFRP fabrics were used as strips form with other parameters such as the number of layers and spacing of strips. Experiments were undertaken until failure to fully understand the influence of FRP characteristics on the compressive behavior of strengthened hollow tubular columns. The experimental results revealed that the external bonding of normal modulus CFRP strips significantly enhanced the load carrying capacity and stiffness of the HSS tubular sections and also delays the axial shortening of column by providing confinement/restraining effect against the elastic deformation. And also, increase in thickness of CFRP strips effectively delays the local buckling of HSS column and lead to the inward buckling rather than outward.
[ABSTRACT]   Full text not available  [PDF] [CITATIONS]
  1 1,173 386
Power Output Improvement of Solar Panel by Automatically Controlled Air Cooling System: An Experimental Study
S Chidambara Raja, M Muhilan, B Vigneshkumar
January-June 2013, 3(1):23-30
DOI:10.4103/0976-8580.107097  
Energy plays a prominent role in human society. As a result of technological and industrial development, the demand for energy is rapidly increasing. Existing power sources that are mainly fossil fuel based are leaving an unacceptable legacy of waste and pollution apart from diminishing stock of fuels. Hence, the focus is now shifted to large-scale propagation of renewable energy. Solar energy is becoming a fast-developing field. The utilization of solar energy can be done using either photovoltaic's (PV) or solar thermal methods. During the energy conversion in the solar panel, around 15% of energy is lost due to thermal effects. This creates a major thermal design challenge as every degree of temperature rise in the PV panels reduces the power produced by 0.5%. With the objective of reducing the power loss due to thermal effects, the design and development of closed-loop control system with air cooling arrangement have been made to avoid temperature rise, and the performance of solar panel has been evaluated for different intensities. It has been found that there is 5.38% increase in the output power.
[ABSTRACT]   Full text not available  [PDF]
  - 1,113 511
Behavioural Study of Piled Raft Foundation in Layered Deposits of Soft Soils
Shruti J Shukla, Atul K Desai, Chandresh H Solanki
January-June 2013, 3(1):31-35
DOI:10.4103/0976-8580.107098  
A piled raft foundation is a combination of a shallow foundation and a deep foundation with the best characteristics of each of its components. The piled raft foundation is a composite construction consisting of three bearing elements, piles, raft, and subsoil. Unlike the traditional design of foundation where the load is carried either by the raft or by the piles, in the design of a piled raft foundation the load share between the piles and the raft is taken into account. In this foundation, the piles usually are not required to ensure the overall stability of the foundation but to reduce the magnitude of settlements, differential settlements and the resulting tilting of the building and guarantee the satisfactory performance of the foundation system. The bearing behavior of a piled raft foundation is characterized by complex soil-structure interactions (Katzenbach, et al., 1998). The modeling of these interactions requires a reliable and powerful analysis tool, such as the finite element (FE) method in combination with a realistic constitutive law. Different researches have been realized investigations about the numerical modeling of piled rafts with FE analysis and different constitutive models. The present research combines the 3D modeling with a modern and realistic constitutive model. An increasing number of structures, especially tall buildings are founded on piled rafts (O'Neil, et al., 1996; Katzenbach, et al., 2000; Poulos, 2001). For this reason, it is important to develop a methodology to study the bearing behavior of piled rafts. In this paper, different parameters of piled raft foundation such as diameter of the piles and thickness of rafts are discussed. It is incorporated with computational modeling of piled raft foundation.
[ABSTRACT]   Full text not available  [PDF]
  - 1,432 454
Design and Development of Cost-Effective Global Positioning System General Packet Radio Service: Based Soldier Tracking System
L Ashok Kumar
January-June 2013, 3(1):36-40
DOI:10.4103/0976-8580.107099  
This article proposes a low-cost object tracking system using global positioning system (GPS) and general packet radio service (GPRS). The current object tracking systems utilize short messaging service (SMS) technology which when compared with GPRS is costlier. Hence, using GPRS in this system makes it economical and reduces the working cost. GPRS also enjoys the advantages of faster and continuous data transmission. This system uses a Telit-GM-862GPS module, which tracks the location details such as latitude, longitude, speed, altitude, and accuracy, in a specific data format known as National Marine Engineering Association (NMEA) protocol. This location data format is processed further with a PIC16F877 microcontroller. The processed information is sent to GPRS module then to a Web server, where a database is already created, using Microsoft Access, ASP.NET, MYSQL for storing the location details so as to allow the user to view the present and past positions of a target object on Google map through internet to track wounded soldiers and also military vehicles.
[ABSTRACT]   Full text not available  [PDF]
  - 983 296
Flank Wear Prediction Model Development by Response Surface Methodology
Satpal Sharma
January-June 2013, 3(1):41-45
DOI:10.4103/0976-8580.107100  
It is necessary to select the optimum cutting parameters in order to improve the efficiency of any machining process. The selections of the optimum cutting parameters significantly improve the tool life. Hence, in the present investigation, cutting parameters such as cutting speed, feed rate, depth of cut and nose radius were used for flank wear model development for Al-SiC composite. The machining of the composite was carried out using response surface methodology. Face centered composite design with three levels of each factor was used for flank wear study of the developed composite. A response surface model for flank wear was developed in terms of main factors and their significant interactions. The developed model was validated by conducting experiments at different levels of factors used. Furthermore, the model was optimized for minimum flank wear. An error of 3-8% was observed in the modeled and experimental results.
[ABSTRACT]   Full text not available  [PDF]
  - 990 233
Design of Compliant Mechanism for Vibration Isolation using Topology Optimization and Flexible Building Blocks
Venkatraman Vijayan, Thangavelu Karthikeyan
January-June 2013, 3(1):46-51
DOI:10.4103/0976-8580.107101  
Compliant mechanism is the focus of active research because of the stability, robustness, and ease of manufacturing endowed by their unitized construction. In this article, we explore an application of compliant mechanism for vibration isolation system with rigid foundation. Structural optimization approach is focused on the determination of the topology, shape, and size of the mechanism. The building blocks are used to optimize a structure for force transmission. The force transmitted to the rigid foundation through the isolator is reduced to avoid transmission of vibration to other machines. The design drawing model is compared with the existing isolator model, displacement transmissibility or amplitude for varying disturbance frequency and the force transmitted for corresponding disturbance frequency. Isolation efficiency of design drawing model is proven to be high when compared with the existing model.
[ABSTRACT]   Full text not available  [PDF]
  - 1,073 276
Evaluation of Mechanical Characteristics for Mineral Cast Materials with Varying Resin Content
A Selvakumar, PV Mohanram
January-June 2013, 3(1):52-56
DOI:10.4103/0976-8580.107102  
Alternative materials are under study, to improve the stiffness and strength of the machine tool structure and to reduce the geometrical inaccuracies caused due to positional errors developed by conventional materials. The mechanical properties exhibited by mineral-cast structures such as high damping and high structural stiffness along with good strength and reduced weight make them attractive as alternative material. However, the mechanical properties of the material vary with the proportion of components in the mixture. This study attempts to evaluate the mechanical characteristics of mineral-cast material with varying epoxy content in the mixture. The epoxy content in the mixture is varied between 10% and 18% and the mechanical characteristics such as compressive strength, tensile strength, and Young's modulus are evaluated to arrive at an optimum composition of mixture. Granite which has high compressive strength is selected and crushed into fine and coarse particles and used as aggregate. It is mixed with epoxy resin to prepare the test specimen by pouring the mixture into a wooden mold of required size and shape. The mixture is cured for 1 week in order to obtain better results. It is observed that with increase in resin content from 10% to 14%, properties, such as stiffness and strength improve and then it starts diminishing. A combination with 12% epoxy resin and 88% aggregate material is observed to produce favorable mechanical properties at an optimum cost.
[ABSTRACT]   Full text not available  [PDF]
  - 1,069 299
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