Journal of Scientific & Industrial Research

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VOLUME 66

NUMBER 4

APRIL 2007

CONTENTS

Preface

Mobile & Telecommunications Industry

281

Growth of mobile services across regions of India







Varadharajan Sridhar

Penetration of mobile services is not uniform across the country. While some areas of the country have experienced exponential growth, the other areas, especially economically disadvantaged, have very low mobile density. This mobile divide is a serious concern for government, policy makers and telecom operators. Predicting growth of subscriber base across regions of the country is critical for all stakeholders. The study aims to better forecast the penetration of mobile services across regions of the country so that their effect on economic development can be further explored and policies can be formulated to reduce the mobile divide.

290

Total assessment and optimization of telecommunication sectors by an integrated multivariate approach

 

 

 

 

 

 

 

A Azadeh, H R Izadbakhsh & A Bukhari

This paper presents an integrated multivariate approach (IMA) for total assessment, ranking and optimization of telecommunication sectors based on standard indicators identified by International Telecommunication Union (ITU). The integrted approach is based on Data Envelopment Analysis (DEA) and Principal Component Analysis (PCA) and Numerical Taxonomy. Indicators are catagorized as telephone network size, other services, quality of service, traffic, tariffs, staff, demography, economy, information technology, broadcasting and mobile services. To present applicability of IMA, data for 2003 of 27 developed and developing countries are used. A total of 9 indicators are considered, out of which 4 are inputs and 5 are outputs. This is the first study that presents an IMA for total assessment, improvement and optimization of the telecommunication sectors.

299

Managing uncertainty in forecasting the diffusion of telecommunications innovations

 

 
















 

Kaisu Puumalainen, Sanna Sundqvist & Janne Huiskonen

The study presents how adding more independent explaining variables and applying neural networks for forecasting purposes could improve the forecasting accuracy of the diffusion of innovations. The paper proposes a set of uncertainty sources of telecommunications industry that have notable affect on the diffusion of innovations in the field. Diffusion patterns and uncertainty indicators of 81 countries were classified using self-organizing map neural network approach, and the results indicate that various levels and types of uncertainty are likely to produce different types of diffusion patterns.

Mobile & Telecommunications Industry

305

Catching up? Differences in 2G mobile diffusion in industrialized and developing countries

















Heli Koski & Tobias Kretschmer

In developing countries, the launch of wireless communication technologies has resulted in a substantial improvement in the coverage of communication networks. It remains uncertain, however, if diffusion processes in developing countries follow a similar pattern and are governed by similar determinants as in industrialized countries. Our results suggest that this is indeed the case and that technological progress in developing countries can be fostered by changing the competitive and regulatory environment and capping service prices if possible.

  

312

Diffusion of mobile communications: Application of bass diffusion model to BRIC countries









 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ashish Kumar, Rajat K Baisya,

Ravi Shankar & Kiran Momaya

The growth of mobile communications market needs to be studied and understood, from three perspectives: i) Drivers, nature and impact of the growth of mobile communications in depth; ii) Lessons from global markets and other industries can help cellular operators bring telecoms to poorer people; and iii) Lessons from this market can be applied to other fundamental needs that have to reach out to the “bottom of the pyramid”. This paper presents applicability of the Bass Diffusion Model (BDM) to Brazil, Russia, India and China (BRIC markets). BDM explains the diffusion of mobile communications in these countries well. In the case of India, there are two key findings: (i) Value of ‘q’ the coefficient of internal influence (word- of- mouth and contact) is very high compared to the other BRIC countries in the sample; and (ii) BDM predicts a potential market of about 200 million subscribers.

 

Management & Information Technology

317

Dynamic collaboration of repair crews in production shops












P Naga Srinivasa Rao & V N Achutha Naikan

This paper presents a model for application of joint repair in large production shops by dynamic collaboration of repair crews. The model evaluates optimum availability, optimum number of repair crews, limiting availability, and limit on the number of repair crews to be employed in a production system with large number of identical and independent machines having no specified RLD (reliability logic diagram). Significant improvement in availability, and increase in net-benefit can be achieved with no additional investment by employing joint repair. An illustrative example from a spinning mill is presented for clarification of the model.

325

Performance evaluation of material handling system for a warehouse












P S Chakraborty, G Majumder & B Sarkar

This paper attempts to find out the best available alternative Material handling system (MHS), an integral component of warehouse operations. Analytic Hierarchy Process (AHP), a flexible decision making tool for complex, multi-criteria problems and useful to provide management weightage, has been used in this study to develop performance model. The proposed algorithm, used to select the proper MHS is the hybrid of AHP performance model and capital investment. Sensitivity analysis has also been reported for making an eclectic decision. The newly developed method is sound surrogate to the traditional techniques.

Table 5 — Number of CSIR Emeritus Scientist schemes sanctioned during 1999-2004

 

Year

Schemes considered

Schemes sanctioned

Ongoing schemes

 

1999-00

95

18

106

2000-01

105

19

102

2001-02

111

26

94

2002-03

134

35

89

2003-04

125

28

110

 

 
330

Contribution of superannuated scientists to National S&T: A case study of CSIR emeritus scientist scheme



















V S Bhati, S K Sharma, Archana Gupta & Rajesh Luthra

Performance analysis of the CSIR Emeritus Scientist scheme has been carried out on the following criteria: i) Quality of output from the Emeritus Scientists; ii) Value attached to the scheme by scientific community; and iii) Acceptability of the scheme across research disciplines. Analysis reveals that the scheme selects high quality research workers who not only turn out work, acceptable in high-end journals, but also train students. The scheme attracts scientists equally from universities and R&D institutions, and enjoys high prestige across the scientific disciplines.

 

Management & Information Technology

335

ANFIS for prediction of weld bead width in a submerged arc welding process








 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

J Edwin Raja Dhas & S Kumanan

This paper proposes an intelligent technique, Adaptive Neuro-Fuzzy Inference System (ANFIS), to predict the weld bead width in the submerged arc welding (SAW) process for a given set of welding parameters. Experiments are designed according to Taguchi’s principles and its results are used to develop a multiple regression model. Multiple sets of data from multiple regression analysis are utilized to train the intelligent network. The trained network is used to predict the quality of weld. The proposed ANFIS, developed using MATLAB functions, is flexible, accurate than existing models and it scopes for a better online monitoring system.

 

 

339

Comparative investigation using fuzzy model and OptSim on WDM systems in presence of FWM and dispersion compensation













 

 

 

 

 

 

 

 

 

Amarpal Singh, Ajay K Sharma,
T S Kamal Vishal &Paramjit Singh

This paper, investigates the impact of pre-, post-, symmetrical using Dispersion Compensating Fiber (DCF) and Fiber Brag Grating (FBG) dispersion compensation methods on Four Wave Mixing (FWM) for 10 Gb/s non-return to zero (NRZ) links by varying the state of polarization and core effective area of fiber through computer simulation. Performance characteristics (FWM power, eye diagram and Q value at the output) are studied by simulating the optical communication systems. A fuzzy controller based on fuzzy rule base using Adaptive Neuro Fuzzy Inference System (ANFIS) has been reported. It is indicated that FBG technique has been found superior to all other methods.

Management & Information Technology

345

Multi-component mass transfer in a single particle during gaseous propylene polymerization

























U Parasu Veera, T McKenna & G Weickert

Mass transfer in the growing catalyst/polymer particle is modeled with dusty gas model (DGM), while the particle growth is described with Polymeric Flow. A Thiele modulus defined in terms of diffusion combined with viscous flow, is called viscous modulus, and used to analyze the dominating mechanism for mass transfer when there is an additional transport of reactant (convection) along with diffusion in a single reacting particle. Addition of high or low molecular weight inert/diluent gas affects mixture diffusivity and thus decreases or increases reaction rate respectively. Both propylene-N2 and propylene-C3H8 systems, which are commonly employed in industry, are studied. Effect of low molecular weight inert is studied with propylene-He system. Porosity and pore size effect on reaction rate is also discussed.

IPC Code: C08F2/34

Author-Reader Platform

352

Instructions to contributors

 

Author Index

 



Azadeh A

290

 

 

Baisya R K

312

Bhati V S

330

Bukhari A

290

 

 

Chakraborty P S

325

 

 

Dhas J E Raja

335

 

 

Gupta A

330

 

 

Huiskonen J

299

 

 

Izadbakhsh H R

290

 

 

Kamal T S

339

Koski H

305

Kretschmer T

305

Kumanan S

335

Kumar A

312

 

 

Luthra R

330

 

 

Majumder G

325

McKenna T

345

Momaya K

312

 

 

Naikan V N A

317

 

 

Puumalainen K

299

 

 

Rao P N S

317

 

 

Sarkar B

325

Shankar R

312

Sharma A K

339

Sharma S K

330

Singh A

339

Singh P

339

Sridhar V

281

Sundqvist S

299

 

 

Veera U P

345

Vishal

339

 

 

Weickert G

345



Keyword Index

 


Additive repair rate

317

Analytic Hierarchy Process (AHP)

325

ANFIS

335

Assessment

290

 

 

Bass Diffusion Model

312

Bead width

335

 

 

Cellular subscriptions

299

Clustering

339

Core effective area

339

 

 

DEA

290

Developing countries

305

Diffusion

312

Diffusion of innovations

299

Dispersion compensation

339

Dynamic collaboration of repair crews

317

 

 

Emeritus scientist scheme

330

 

 

Four-wave mixing

339

 

 

Growth models

281

 

 

Joint repair

317

 

 

Limiting availability

317

 

 

Mass transfer

345

Material-handling system (MHS)

325

Mobile communication

281

Mobile communications

312

Mobile telephony

305

Multiple regression model

335

 

 

Neural networks

299

Non-additive repair rate

317

Numerical taxonomy

290

 

 

Optimization

290

Optimum availability

317

 

 

PCA

290

Performance

290

Performance analysis

330

Performance model

325

Polymeric flow dusty gas model (PF_DGM)

345

 

 

Reaction rate

345

Research scheme

330

RLD

317

 

 

Sensitivity analysis

325

SOM

299

Submerged arc welding

335, 339

Sugeno fuzzy inference system

339

Superannuated scientist

330

 

 

Technology diffusion

305

Telecommunication

290

Telecommunications

299

 

 

Uncertainty

299

Viscous modulus

345

 

 

WDM systems

339