1 / 36

Virtual Center for Supernetworks

Outline of Research Activities Dmytro Matsypura Presentation at MKIDS Mini-Workshop September 10, 2003. Virtual Center for Supernetworks. Research Interests. Modeling and analysis of complex decision-making on network systems Specific focus on global issues

rbrush
Télécharger la présentation

Virtual Center for Supernetworks

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Outline of Research Activities Dmytro Matsypura Presentation at MKIDS Mini-Workshop September 10, 2003 Virtual Center for Supernetworks

  2. Research Interests • Modeling and analysis of complex decision-making on network systems • Specific focus on global issues • Global transportation networks • Global telecommunication networks • Global supply chain networks • Risk issues

  3. Motivation (Global Supply Chains) • Growing competition brought new challenges • Supply chains have become increasingly globalized • Addressing risk issues is more important then ever • SARS • Terrorist threats

  4. Motivation (Global Supply Chains) • Success can not rely solely on improving the efficiency of internal operations • Collaboration can build the foundation for a competitive advantage • The principal effect of B2B commerce is in the creation of more profitable supply chain networks

  5. Motivation (E-Commerce) • The Net and e-business now is a vital part of commerce • The Commerce Dept. estimates: • retail e-commerce accounted for $45 billion in sales in 2002, up 11% from the prior year • in the first quarter of 2003, online retail sales jumped to $11.9 billion, 30% from the first quarter of 2002, while total retail sales grew just 4.4% in this same period • Last year, Intel generated 85% of its orders -- some $22.8 billion worth -- online

  6. Supernetwork

  7. Research Papers • Dynamics of Global Supply Chain Supernetworks (GSCS) • Anna Nagurney, Jose Cruz, and Dmytro Matsypura, 2002 • Global Supply Chain Supernetworks with Random Demands (GSCSwRD) • Anna Nagurney and Dmytro Matsypura, 2003 • Dynamics of Global Supply Chain Supernetworks with E-Commerce (GSCSwE) • Jose Cruz and Dmytro Matsypura, 2003

  8. Decision-Making Setting • Supply chain networks • Three distinct types of decision-makers • Optimizing Agents • Multiple countries • Multiple currencies • Homogeneous product

  9. Our Unique Perspective • Dynamics of GSCS • Manufacturer-retailer-demand_market • Elastic demand • GSCSwRD • Manufacturer-distributor-retailer • Random demand • e-commerce • Dynamics of GSCSwE • Manufacturer-retailer-demand_market • Elastic demand • e-commerce

  10. Dynamics of Global Supply Chain Supernetworks • Notable features: • It handles as many countries, manufacturers, retailers, and demand markets as mandated by the specific application • It predicts the equilibrium product shipments and also the equilibrium prices • Retailers may be physical or virtual • The transaction costs need not be symmetric • It allows for the analysis of the equilibrium product flows and prices as well as the disequilibrium dynamics

  11. The Supernetwork Structure

  12. The Optimization Problem for the Manufacturer

  13. The Optimization Problem for the Retailer

  14. The Optimality Conditions at the Demand Market and

  15. The Equilibrium Conditions Governing the Global Supply Chain Network

  16. Global Supply Chain Supernetworks with Random Demands • Another class of decision-maker: Distributor • Retailers can trade with Manufacturers through Distributors as well as directly through e-links • Retailers are facing random demand • Retailers bear all the risk associated with random demand

  17. Global Supply Chain Supernetwork with Random Demands

  18. The Optimization Problem of the Manufacturer

  19. The Optimization Problem of the Distributor

  20. The Optimization Problem of the Retailer

  21. Market Equilibrium Conditions

  22. Dynamics of Global Supply Chain Supernetworks with E-Commerce • Back to manufacturer-retailer-demand_market schema • Allow for B2C electronic transactions • Elastic demand

  23. Global Supply Chain Supernetwork with E-Commerce

  24. Dynamics of Global Supply Chain Supernetworks with E-Commerce • The VI formulation is somewhat similar to previously discussed • Yet it is different for it allows for B2C e-commerce • Our main interest: behavior of the system in time

  25. Dynamics • Demand market price dynamics: • The rate of change of the price is equal to the difference between the demand for the product and the amount of product actually available at the particular market

  26. Dynamics • The product shipments retailer<->demand_market: • The rate of change of the product shipment is equal to the price consumers are willing to pay minus the price of a retailer and various transaction costs

  27. Dynamics • The prices at the retailers: • The rate of change of the clearing price is equal to the difference betweenthe amount of product shipped in and out

  28. Dynamics • The product shipments manufacturer <-> retailer: • The rate of change of the product shipment is equal to the clearing price minus production and transaction costs

  29. Dynamics • The product shipments manufacturer <-> demand_market: • The rate of change of the product shipment is equal to the price consumers are willing to payminus production and transaction costs

  30. Results • The non-classical projected dynamical system • Describes the dynamic evolution of the product flows and prices • Describes the dynamic interactions among the product flows and prices • The set of stationary points coincides with the set of solutions to the variational inequality problem

  31. The Algorithms We seek to determine x*2 K½ Rn, such that hF(x*)T, x-x*i¸ 0, 8x2 K where F:K! Rn, continuously differentiable K is convex, compact and closed set Assume there exist smooth g(x,y):K£K! Rn, such that: (i) g(x,x)=F(x),8x2 K, (ii) for every fixed x,y2 K, n£n matrix rxg(x,y) is symmetric and positive definite • General Iterative Scheme • Modified Projection Method

  32. The Algorithms Step 0: Initialization Set X02K. Let k = 1 Step 1: Construction & Computation Compute Xkby solving the VI subproblem: hg(Xk, Xk –1)T, X – Xki¸0, 8 X2 K. Step 2: Convergence Verification If |Xk – Xk-1|·e, e> 0, a prespecified tolerance, then stop; else, set k=k+1, and go to Step 1. • General Iterative Scheme • Modified Projection Method

  33. The Algorithms Step 0: Initialization Set X02K. Let k = 1 and let abe a scalar such that 0 < a<1/L, where L is the Lipschitz constant Step 1: Computation Compute Ykby solving the VI subproblem: h Yk+ aF(Xk –1) – Xk –1, X – Yki¸0, 8 X2 K. Step 2: Adaptation Compute Xkby solving the VI subproblem: h Xk + aF(Yk-1) – Xk–1, X – Xki¸0; 8 X2 K. Step 3: Convergence Verification If |Xk – Xk-1|·e, e> 0, a prespecified tolerance, then stop; else, set k = k + 1, and go to Step 1. • General Iterative Scheme • Modified Projection Method

  34. Summary • We have developed a general framework for • Modeling • Analysis • Computation of solutions to Global Supply Chain Supernetworks • Proposed a dynamic adjustment process • Established stability of the network systems under certain conditions

  35. Future Research • The framework we utilize can be adjusted and applied to the developing of the theory of knowledge supernetworks • Our algorithms can be used for conducting • qualitative analysis • sensitivity analysis • perturbation analysis of knowledge-intensive organizations

  36. Questions? Comments? http://supernet.som.umass.edu

More Related