### CONFERENCE PUBLICATIONS

**2022**

- S. Jana and J. Mahanta, Intuitionistic fuzzy 9 intersection matrix for obtaining the relationship between indeterminate objects, International Conference on Information System Design and Intelligent Applications, BVRIT-H College of Engineering for Women, Hyderabad, Telangana, India, 25-26 February 2022 (Accepted)
- P Sharma, S Saha, P Biswas, Solitons of the Modified KdV equation with variable coefficients, Journal of Physics: conference series, Accepted.

## 2021

- S Saha, P Biswas, S. Nath,A Survey On Spectral Element Solver Nek5000, AIP (web of Science and Scopus Indexed) conference proceedings. Computational Sciences- Modelling, Computing and Soft Computing (CSMCS-2020).
- Barman, A., Das, R., & De, P. K. (2021). Optimal pricing and greening decision in a manufacturer – retailer dual-channel supply chain. Materials Today: Proceedings, 42, 870-875. (
**Scopus**) - Das, R., De, P. K., & Barman, A. (2021). Co-ordination of a two-echelon supply chain with competing retailers where demand is sensitive to price and quality of the product. In
*Mathematical Modeling, Computational Intelligence Techniques and Renewable Energy*(pp. 379-387). Springer, Singapore. (**Scopus**) - Barman, A., & De, P. K. (2021). A Multi-item Deteriorating Inventory Model Under Stock Level-Dependent, Time-Varying, and Price-Sensitive Demand. In
*Recent Trends in Applied Mathematics*(pp. 1-12). Springer, Singapore. (**Scopus**) - Barman, A., & De, P. K. (2021). Mathematical Modeling of an EOQ for a Multi-item Inventory System with Selling Price and Price Break Sensitive Demand. In
*Applied Mathematical Modeling and Analysis in Renewable Energy*(pp. 35-46). CRC Press. (**Scopus**)Das, R., & De, P. K. (2021). A Two Level Supply Chain Model Where Demand Is Stochastic Additive Under Buyback Policy. In*Recent Trends in Applied Mathematics*(pp. 391-403). Springer, Singapore. (**Scopus**) - Pankaj, P. D., & Singh, A. (2021). A Study of Propagation of Love Waves in an Anisotropic Porous Layer Under Initial Stresss.
*Recent Trends in Applied Mathematics: Select Proceedings of AMSE 2019*, 267. - Kumari, M., & De, P. K. (2021). Mathematical Modeling for an Optimal Order Inventory with Demand Dependent Selling Price, Nonlinear Stock, and Nonlinear Holding Cost. In
*Recent Trends in Applied Mathematics*(pp. 231-253). Springer, Singapore.

## 2020

- PrabhujitMohapatra, KedarNath Das, Santanu Roy, ‘Novel Competitive Swarm Optimizer for Sampling based Image Matting Problem’, Springer proceeding of the International Conference ICACNI, Vol.1, pp. 109-120, 2020. (SCOPUS)
- Shivashankar, P., Kumar, S., &Gopalakrishnan, S. (2020). Design, development and the analysis of d31-mode and d33-mode multilayered surface bondable piezoelectric actuators, for actuation of large and stiff structures. The American Institute of Aeronautics and Astronautics (AIAA) SciTech 2020 Forum, 6-10 January 2020, Orlando, Florida, USA, doi: 10.2514/6.2020-1767.
- P. Mahapatra, K N Das & S. Roy, “Novel Competitive Swarm Optimizer for Sampling-Based Image Matting Problem”, Smart Computing Paradigms: New Progresses and Challenges, Advances in Intelligent Systems and Computing, 766, doi.org/ 10.1007/978-981-13-9683-0-12, Springer Nature, Singapore, 2020
- S Saha, P Biswas, S. Nath, Numerical modelling of bifurcation and leakage of blood flow in mitral valve to predict heart malfunctioning, ICIMSAT, 684-692, 2020
- Barman, A., Das, R., & De, P. K. (2020, June). Pricing and inventory policy for deteriorating item in a two-echelon supply chain: a stackelberg duopoly game approach. In 2020 8
^{th}International Conference on Reliability, Infocom Technologies and Optimization (Trends and Future Directions)(ICRITO) (pp. 796-800). IEEE. (**Scopus**).

## 2019

- Raghav Prasad Parouha, KedarNath Das, “An Upgraded Differential Evolution via Memory-Based Mechanism for Economic Dispatch”, Springer proceeding of the International Conference on Soft Computing for Problem Solving (SocProS-2019), Vol.1, pp. 65-73, 2019
- P. Mahapatra, K N Das & S. Roy, “Inherited Competitive Swarm Optimizer for Large Scale Optimization”, Harmony Search and Nature Inspired Optimization Algorithms, Advances in Intelligent Systems and Computing, 741, doi.org/ 10.1007/978-981-13-0761-4-9, Springer Nature, Singapore, 2019
- Oral presentation of a research paper entitled “Numerical solution of tumor-immune model including small molecule drug by multi-step differential transform method” by Praveen Kumar Gupta in the 13th International Conference on Computing, Engineering and Information Technology (ICCEIT 2019) held at Bangkok, Thailand, during September 28-29, 2019

## 2018

- PrabhujitMohapatra, KedarNath Das, Santanu Roy, “Novel Tripartite Competitive Swarm Optimizer for Large Scale Optimization Problems”, Springer proceeding of the International Conference on Soft Computing for Problem Solving (SocProS-2018), held during 17-18 Dec. 2018
- SubrataBera, S. Bhattacharyya and H. Ohshima, “Numerical Study on the Influence of Diffused Soft Layer in pH Regulated Polyelectrolyte-Coated Nanopore”, ICMC-2018, Mathematics and Computing, Springer Proceedings in Mathematics & Statistics, 253 (2018) 155-168, https://doi.org/10.1007/978-981-13-2095-8_13.
- Oral presentation of a research paper entitled “Local and Global Stability of Fractional Order HIV/AIDS Dynamics Model” by Praveen Kumar Gupta in the 4th International Conference on Mathematics and Computing (ICMC 2018) held at Indian Institute of Technology (Banaras Hindu University), Varanasi, India, during January 09-11, 2018.
- Oral presentation of a research paper entitled “Numerical solution with analysis of HIV/AIDS dynamics model with effect of fusion and cure rate” by Praveen Kumar Gupta in the International Conference on Mathematical Sciences and Statistics (ICMSS 2018) held at University of Putra Malaysia, Putrajaya, Malaysia, during February 06-08, 2018
- Oral presentation of a research paper entitled “Dynamical behavior of fractional order tumor-immune model with targeted chemotherapy treatment” by Praveen Kumar Gupta in the 3rd International Conference on Advances in Mechanical and Production Engineering (ICAMPE 2018) held at Royal Orchid Sheraton Hotel & Towers, Bangkok, Thailand, during March 19-20, 2018
- P Biswas, N. Kishore Kumar and Anil Kumar Kar, Performance of space-time coupled least-squares spectral element methods for parabolic problems, Journal of Physics, 3rd International Conference on Mathematical Sciences and Statistics, Department of Mathematics Universiti Putra Malaysia, Conf. Series 1132, 012-020, 2018

## 2017 and Prior

- P.K.De and ApurvaRawat, ‘Optimization of Fuzzy inventory model under fuzzy demand and fuzzy lead time using exponential fuzzy number’, International Conference IEEE FSKD 2012
- D. B. Mishra, R. Mishra, K. N. Das, A. A. Acharya’, ‘Solving Sudoku Puzzles Using Evolutionary Techniques, A Systematic Survey’, Conference Proceeding of SocTA, Soft Computing: Theories and Applications, Vol. 583, pp. 791-802, Springer, Nov. 2017
- K. N. Das, Sumit Bhatia, ShubhinPuri, Kusum Deep, ‘Solving Sudoku Puzzle by Evolutionary Algorithm’, ATCM – 2016, Pattaya, Bangkok, Thailand, during 14-18 Dec. 2016
- D. B. Mishra, R. Mishra, K. N. Das and A. Abhinna Acharya, ‘A systematic review of Software testing using Evolutionary Techniques’, Thapar University, 23-24 Dec. 2016, Springer Proceedings of 6th International Conference on Soft computing for problem solving (SocProS2016), Vol. 2, pp. 174-184, 2016
- R. Mishra, K. N. Das and Kusum Deep, Design of Chemo-GA for Engineering Design Optimization Problem’, Proceedings of IEEE Int. Conf. on Control, Measurement and Instrumentation (CMI), pp. 141-145, Jadavpur University, Kolkata, 8-10, Jan. 2016
- R. Mishra and K. N. Das, ‘Chemo-inspired Genetic Algorithm and applications to Model Order Reduction Problem’, in the Proceedings of Fifth International Conference on Soft Computing for Problem Solving: SocProS 2015, Volume 1 (Advances in Intelligent Systems and Computing)’, Saharanpur campus of IIT Roorkee, pp. 31-41, 2016
- K. N. Das and T. K. Singh, A novel approach for Solving Engineering Optimization Problems involving Equality Constraints, Proceeding of International Conference on Robotics, Mechanics and Mechatronics (ICRMM 2015), Singapore, March 21-23, 2015
- R. Mishra and K. N. Das, A Novel Chemo-inspired GA for Solving Constrained Optimization problem, Proceeding of International Conference on Computing, Communication and Automation (ICCCA2015), IEEE conference proceeding, pp. 156-160, Galgotias University, 2015
- K. N. Das and R. Parouha, Engineering Design Optimization using hybrid (DE-PSO-DE) algorithm, Proceedings of Fourth International Conference on Soft Computing for Problem Solving, Advances in Intelligent Systems and Computing, Springer, Vol. 335, pp. 461-475, 2015
- K. N. Das, T. Singh and K. L. Baishnab, Parameter Optimization of Winner-Take-All circuit for Attention Shift using Drosophila Food-search Algorithm, Proceedings of Fourth International Conference on Soft Computing for Problem Solving, Advances in Intelligent Systems and Computing, Springer, Vol. 336, pp. 79-90, 2015
- K. N. Das and R. Mishra, A novel chemo-inspired Genetic Algorithm for ELD with valve point loading effect, Proceedings of Fourth International Conference on Soft Computing for Problem Solving, Advances in Intelligent Systems and Computing, Springer, Vol. 335, pp. 443-460, 2015
- K. N. Das, Sumit Bhatia, ShubhinPuri, Kusum Deep ‘Solving Sudoku Puzzle by Evolutionary Algorithm’, ATCM – 2016, Pattaya, Bangkok, Thailand, during 14-18 Dec. 2016
- D. B. Mishra, R. Mishra, K. N. Das and A. Abhinna Acharya, ‘A systematic review of Software testing using Evolutionary Techniques’, Accepted for publication in Springer Proceedings of 6th International Conference on Soft computing for problem solving (SocProS2016), Thapur University, 23-24 Dec. 2016
- Rajashree Mishra, KedarNath Das and Kusum Deep, ‘Design of Chemo-GA for Engineering Design Optimization Problem’, Proceedings of IEEE Int. Conf. on Control, Measurement and Instrumentation (CMI), pp. 141-145, Jadavpur University, Kolkata, 8-10, Jan. 2016. (to be appear online in the proceeding)
- Rajashree Mishra and KedarNath Das, ‘Proceedings of Fifth International Conference on Soft Computing for Problem Solving: SocProS 2015, Volume 1 (Advances in Intelligent Systems and Computing)’, Saharanpur campus of IIT Roorkee, 18-20, Dec. 2015. (to be appear online in the proceeding)
- K. N. Das and T. K. Singh, A novel approach for Solving Engineering Optimization Problems involving Equality Constraints, Proceeding of International Conference on Robotics, Mechanics and Mechatronics (ICRMM 2015), April 21-23, 2015
- R. Mishra and K. N. Das, A Novel Chemo-inspired GA for Solving Constrained Optimization problem, Proceeding of International Conference on Computing, Communication and Automation (ICCCA2015), IEEE conference, pp. 156-160
- K. N. Das and R. Paourha, Engineering Design Optimization using hybrid (DE-PSO-DE) algorithm, Proceedings of Fourth International Conference on Soft Computing for Problem Solving, Advances in Intelligent Systems and Computing, Springer, Vol. 335, pp. 461-475, 2015
- K. N. Das, T. Singh and K. L. Baishnab, Parameter Optimization of Winner-Take-All circuit for Attention Shift using Drosophila Food-search Algorithm, Proceedings of Fourth International Conference on Soft Computing for Problem Solving, Advances in Intelligent Systems and Computing, Springer, Vol. 336, pp. 79-90, 2015
- K. N. Das and R. Mishra, A novel chemo-inspired Genetic Algorithm for ELD with valve point loading effect, Proceedings of Fourth International Conference on Soft Computing for Problem Solving, Advances in Intelligent Systems and Computing, Springer, Vol. 335, pp. 443-460, 2015
- K. Deep and K. N. Das, “Population based Heuristics for solving some real life optimization problems”, International Conference on Operational Research as Competitive Edge, Heritage Institute of Technology, Kolkata, 5th – 7th Jan, 2007.
- K. Deep and K. N. Das, “Comparative Optimization of Infiltration Parameters”, Proceedings, Int. conf. on GEM’07 in WORLDCOMP’ 07, Las Vegas, USA, pp. 102-107, 25th -28th June, 2007
- K. N. Das, “Minimum Labeling Spanning Tree by Genetic Algorithms: An overview”, International Conference on Operations Research for a Growing Nation, ORSI, S. V. University,Tirupati, 15th -17th Dec, 2008
- K. N. Das and K. Deep, “Minimum Labeling Spanning Tree based on Genetic Algorithms: An overview”, Fourth Global Conference on Power Control and Optimization (PCO’2010), Kuching, Sarawak, Malaysia, pp. 31, 2nd – 4th Dec, 2010.
- K. Deep and K. N. Das, “Hybrid Binary Coded Genetic Algorithm for Constrained Optimization”, Proceeding of ICGST International Conference on Artificial Intelligence and Machine Learning (AIML-11), Dubai, United Arab Emirates, ISSN: 1687-4846 Print, 1687-4854 Online, 1687-4862 CD-ROM, I.C.G.S.T. FZE, 12-14 April 2011, pp. 135-141
- K. N. Das and B. Choudhuri, “Heuristics to find Maximum Independent Set: An overview”, Proceeding of International conference on Soft computing for Problem solving (SocPros-2011), Springer, organized by IIT Roorkee, 20-22nd Dec, 2011; Advances in Soft Computing 2012, Volume 130/2012, pp. 881-892
- K. N. Das and R. Mishra, “A Performance Study of Chemo-Inspired Genetic Algorithm on Benchmark Functions”, Proceedings of Seventh International Conference on Bio-Inspired Computing: Theories and Applications (BIC-TA 2012), Advances in Intelligent Systems and Computing, Volume 202, pp 489-501, 2013
- K. N. Das and Tapan Kumar Singh, “Self Adaptive Hybridization of Quadratic Approximation with Real Coded Genetic Algorithm”, Proceedings of Seventh International Conference on Bio-Inspired Computing: Theories and Applications (BIC-TA 2012), Advances in Intelligent Systems and Computing, Volume 202, pp 503-513, 2013
- K. N. Das and R. Parouha, “Synergy of Differential Evolution and Particle Swarm Optimization”, International Conference ‘SocPors-2013′, Organized by IIT Roorkee, 26-28 Dec, 2013, Proceeding, Springer, Vol. 258, pp. 143-160
- K. N. Das and B. Chaudhuri, “Modified Activity of Scout Bee in ABC for global optimization”, International Conference ‘SocPors-2013′, Springer, Organized by IIT Roorkee, 26-28 Dec, 2013, Proceeding, Springer, Vol. 259, pp 649-659 2014
- K. N. Das and T. K. Singh, “A Novel Search Technique for Global Optimization”, International Conference ‘SocPors-2013′, Organized by IIT Roorkee, 26-28 Dec, 2013, Proceeding, Springer, Vol. 259, pp. 497-508
- K. N. Das and R. Parouha, “Optimization of Engineering Design Problems via an Efficient Hybrid Meta-heuristic Algorithm”, 3rd International Conference on Advances in Control and Optimization of Dynamical Systems, March 13-15, 2014, Indian Institute of Technology Kanpur, India. Proceeding, Elsevier, Vol. 1, Part. 1, pp. 692-699
- R. Parouha and K. N. Das, “An effective hybrid DE with PSO for constrained engineering design problem”, 16th Annual Conf. of Int. Academy of Physical Science on Physical Sc. and Technology for Sustainable Development, March 20-22, 2014, IIITDM, Jabalpur, India.
- K. N. Das and R. Parouha, “Hybridizing DE with PSO for Constrained Engineering Design Problems”, Int. conf. on Industrial Engg. Sc. and Applications, 2-4 April 2014, NIT Durgapur, India. Online Proceeding, pp. 116-121
- SubrataBera and S. Bhattacharyya,”Effect of charge density on electrokinetic ions and fluid flow through polyelectrolyte coated nanopore”,ASME 2017: Fluids Engineering Division Summer Meeting.
- SubrataBera and S. Bhattacharyya,”Electrokinetic Flow in a Surface Corrugated Microchannel”,Mathematics and Computing, ICMC-2017. Communications in Computer and Information Science, 655 (2017) 278-89, Springer, Singapore.
- S. Bera and S. Bhattacharyya, “Electrokinetic effects on solute mixing near a conducting obstacle within a microchannel”, ICMC-2015, HIT, India. Mathematics and Computing, 139 (2015) Springer. DOI 10.1007/978-81-322-2452-5_29.
- SubrataBera and Somnath Bhattacharyya, “Electrokinetic transport and mixing of solute through a microchannel with surface heterogeneity” Proceeding ICCMS 2014, CSIR-SERC, India. ISBN: 978981091139
- S. Bera and S. Bhattacharyya, “Combined electroosmosis-pressure driven flow in a micro channel with nonhomogeneous surface potential”, ICECCS-2013, JUIT, India, Advanced in Energy Aware Computing and Communication Systems, Tata McGraw Hill, ISBN-10: 9351343324.
- S. Bera and S. Bhattacharyya,” Induced charge electro-osmotic flow and transport of solute in a micro channel with a conducting hurdle”, ICCMS-2012, IIT Hydrabad, India.
- B. HemaSundarRaju and T. V. S. Sekhar, Fourth order compact scheme for solving complete Navier-Stokes equations in spherical geometry, presented in RMSMA 2013, December 22, 2013, IIT Hyderabad, India.
- B. HemaSundarRaju and T. V. S. Sekhar, An efficient higher order compact scheme for incompressible Navier-Stokes equations in cylindrical geometry, presented in AICFM 2011, November 21-23, 2011, IIT Madras, Chennai, India.
- Ch. Devicharan, S. Ajay kumar, B. HemaSundarRaju, T. V. S. Sekhar, R. Sivakumar and K.Subbarayudu, Steady laminar convection from a circular cylinder using higher order compact scheme, Proceeding of FMFP2010, December 16-18, 2010, IIT Madras, Chennai, India, FMFP-CF-02, ISBN: 978-81-910571-1-9.
- T. V. S. Sekhar and B. HemaSundarRaju, Higher-order compact scheme for the steady stream-function vorticity equations in spherical geometry, Proceeding of FMFP2010, December 16-18, 2010, IIT Madras, Chennai, India, FMFP-CF-01, ISBN: 978-81-910571-1-9.
- B. HemaSundarRaju and T. V. S. Sekhar, Fourth order accurate heat transfer solutions from a sphere at low and moderate Reynolds numbers, Proceedings of ICTACEM 2010, December 27-29, 2010, IIT Kharagpur, India, No. 327, pp. 796-798, ISBN: 93-80813-03-1.
- K. N. Das and R. Mishra, “Accelerated Bacterial Foraging Hybridized Genetic Algorithm”, Proceeding of National conference, National Conference on Advances in Simulation & Optimization Techniques in Mechanical Engineering (NASOME-2012), KIIT University, Bhubaneswar, Orissa, 18-19th Feb., 2012
- K. Deep and K. N. Das, “Optimization via Genetic Algorithms: Some Experiments with GA operators”, 71st Annual Conference of IMS, IIT Roorkee, 26th – 29th Dec, 2005
- K. Deep and K. N. Das, “A survey of Memetic algorithm for optimization and their Applications”, ORSI, IIM, Ahmedabad, Proceedings, VISION-2020, pp. 389-397, 8th -11th Jan, 2005
- J. Mahanta and P.K. Das, “Further Study on Topological Rough Sets”, In Proc. International Conference on Artificial Intelligence and Soft Computing-2011″, IIMT, Bhubaneswar, Odisha, 9th -10th April 2011
- J. Mahanta and P.K. Das, “Further results on fuzzy g*s-closed sets”, Presented in International Conference on Recent Advances in Mathematics (ICRAM 2014), Department of Mathematics, RastrasantTukadojiMaharaj Nagpur University, 20th -23rd January, 2014
- S. Sahaand S. Roy, “New classes of Statistically Convergent Difference Triple Sequence Spaces of Fuzzy Real Numbers”, Second International Conference on Modern Technologies in engineering and science, ICMTES 2017 organised by Knewton Institute of Research in Engineering and Technology, Andra Pradesh, India during 18-19 August 2017
- P. Mahapatra& S. Roy, “Mathematical Model for Optimization of Perishable Resources with Uniform Decay”, Computational Intelligence in Data Mining, Advances in Intelligent Systems and Computing, 2(411) Springer India 2016. pp. 447-456
- P. Mahapatra& S. Roy, “AP-NSGA-II: An Evolutionary Multi-objective Optimization Algorithm using Average-Point-Based NSGA-II.”, Proceedings of Fourth International Conference on Soft computing for problem solving, Advances in Intelligent system and computing, Springer India, 336
- Oral presentation of a research paper entitled “Mathematical Modelling and analysis of the spread of HIV/AIDS epidemic” by Praveen Kumar Gupta in the International Conference on Mathematical Modelling and Simulation held at Banaras Hindu University, Varanasi, India, during August 29 – 31, 2016.
- Oral presentation of a research paper entitled “Analysis of a Mathematical Model of Hepatitis B Virus Transmission Dynamics” by Praveen Kumar Gupta in the International Conference of The Indian Mathematics Consortium in cooperation with American Mathematical Society held at Banaras Hindu University, Varanasi, India, during December 14-17, 2016
- Oral presentation of a research paper entitled “Numerical study for the model of HIV infection of CD4+ T cells” by Praveen Kumar Gupta in the 15th Annual Conference of Society of Statistics, Computer and Applications held at Department of Mathematics and Statistics, Banasthali University, Banasthali, India, during February 24 – 26, 2013
- Poster presentation of a research paper entitled “Numerical study of SIRS model with Immigration dependence” by Praveen Kumar Gupta in the 15th Annual Conference of Society of Statistics, Computer and Applications held at Department of Mathematics and Statistics, Banasthali University, Banasthali, India, during February 24 – 26, 2013
- Poster presentation of a research paper entitled “Approximate analytical solution of fifth order Sawada-Kotera Equation” by Praveen Kumar Gupta in the 15th Annual Conference of Society of Statistics, Computer and Applications Department of Mathematics and Statistics, Banasthali University, Banasthali, India, during February 24 – 26, 2013
- Oral presentation of a research paper entitled “Analytical Approach to Multi-Dimensional Fractional Helmholtz Equation” presented by S. Tutkun[with A. Yildirim, Praveen Kumar Gupta] in the 1079th AMS Meetings held at University of South Florida, Tampa, Florida, during March 10 – 11, 2012
- Oral presentation of a research paper entitled “Solution of Fractional Schr�dinger Equation by Homotopy Analysis Method” by Praveen Kumar Gupta in the National Conference on Mathematical Modeling and Computer Simulation held at Department of Applied Mathematics, Institute of Technology, Banaras Hindu University, Varanasi, India, during March 25 – 27, 2011
- Oral presentation of a research paper entitled “An Efficient Technique for solving Time-Fractional Telegraph equation” by D. Sunay [with A. Yildirim, S. Das, K. Vishal, Praveen Kumar Gupta, A. Heidari] in the International Conference on Applied Analysis and Algebra held at Yildiz Technical University, Istanbul, Turkey, during June 29 – July 02, 2011
- Oral presentation of a research paper entitled “Application of He’s Homotopy Perturbation Method to Fractional Diffusion equations” by Praveen Kumar Gupta in the National Conference on “Recent Trends in Mathematical Sciences” held at Department of Applied Mathematics, Institute of Technology, Banaras Hindu University, Varanasi, India, during March 18 – 20, 2010
- Oral presentation of a research paper entitled “Approximate Analytical solution of Fractional Lotka-Volterra Equation” by Praveen Kumar Gupta [with S. Das] in the International Congress of Mathematicians conducted by University of Hyderabad, Hyderabad, India, during August 19 – 27, 2010
- Oral presentation of a research paper entitled “A fractional predator-prey model and its solution” by Praveen Kumar Gupta in the Application of mathematical methods in physical problems held at Department of Mathematics, Sikkim Manipal Institute of Technology, Majitar, East-Sikkim, during December 18 – 23, 2009