Ramesh johari phd thesis

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Ramesh johari phd thesis

Ramesh johari phd thesis

Selfish routing is a classical mathematical model of how self-interested users might route traffic through a congested network. The outcome of selfish routing is generally inefficient, in that it fails to optimize natural objective functions.

The price of anarchy is a quantitative measure of this in The price of anarchy is a quantitative measure of this inefficiency. We survey recent work that analyzes the price of anarchy of selfish routing.

Tsitsiklis" We consider a resource allocation problem where individual users wish to send data across a network to maximize their utility, and a cost is incurred at each link that depends on the total rate sent through the link. It is known that as long as users do not anticipate the effect of their actions on Continuing previous efforts to quantify the effects of selfish behavior in network pricing mechanisms, we consider the possibility that users anticipate the effect of their actions on link prices.

Revenue and stability of a mechanism for efficient allocation of a divisible good by Sichao Yang, Bruce Hajek" Abstract A class of efficient mechanisms for allocating a divisible good is studied.

Strategic buyers play a game by submitting one-dimensional bids, or signals, to the seller.

by Ramesh Johari, Shie Mannor, John N. Tsitsiklis, We consider a resource allocation problem where individual users wish to send data across a network to maximize their utility, and a cost is incurred at each link that depends on the total rate sent through the link. The ACM Doctoral Dissertation Award is awarded annually by the Association for Computing Machinery to the authors of the best doctoral dissertations in computer science and computer engineering. The award is accompanied by a prize of US $20, and winning dissertations are published in the ACM Digital Library. [1]. Request Demo spear street, SUITE , San Francisco, ca

The seller allocates the good in proportion to The seller allocates the good in proportion to the bids and charges the buyers nonuniform prices according to the mechanism. Under some Ramesh johari phd thesis conditions on the valuation functions of the buyers, there is a unique Nash equilibrium point NEP and the allocation at the NEP is efficient.

The prices charged to the buyers at the NEP are bounded above by, and can be made arbitrarily close to, the uniform market clearing price for price-taking buyers. A globally stable decentralized algorithm is given, allowing the buyers to reach the NEP.

The work is motivated by the problem of rate allocation on the links of a communication network.

Ramesh johari phd thesis

Johari and Tsitsiklis [11] provided quantitative results along the same lines. We consider the problem of allocating a fixed amount of an infinitely divisible resource among multiple competing, fully rational users. We study the efficiency guarantees that are possible when we restrict to mechanisms that satisfy certain scalability constraints motivated by large scale communica We study the efficiency guarantees that are possible when we restrict to mechanisms that satisfy certain scalability constraints motivated by large scale communication networks; in particular, we restrict attention to mechanisms where users are restricted to one-dimensional strategy spaces.

We first study the efficiency guarantees possible when the mechanism is not allowed to price differentiate. We study the worst-case efficiency loss ratio of the utility associated with a Nash equilibrium to the maximum possible utilityand show that the proportional allocation mechanism of Kelly minimizes the efficiency loss when users are price anticipating.

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We then turn our attention to mechanisms where price differentiation is permitted; using an adaptation of the Vickrey-Clarke-Groves class of mechanisms, we construct a class of mechanisms with one-dimensional strategy spaces where Nash equilibria are fully efficient. These mechanisms are shown to be fully efficient even in general convex environments, under reasonable assumptions.

Our results highlight a fundamental insight in mechanism design: A scalable network resource allocation mechanism with bounded efficiency loss by Ramesh Johari, John N.

The design of pricing mechanisms for network resource allocation has two important objectives: Both objectives are met by certain recently proposed mechanisms when users are price taking, but not when u Both objectives are met by certain recently proposed mechanisms when users are price taking, but not when users can anticipate the effects of their actions on the resulting prices.

In this paper, we partially close this gap, by demonstrating an alternative resource allocation mechanism which is scalable and guarantees a fully efficient allocation when users are price taking. These results are derived by studying Cournot games, and in the process we derive the first nontrivial constant factor bounds on efficiency loss in these well-studied economic models.

An Incentive Mechanism for Decongesting the Roads: We describe an experiment conducted in Bangalore, India, for incentivizing a population of commuters to travel at less congested times. The goals were to reduce the travel times and increase the travel comfort of commuters, and to reduce congestion, fuel consumption and pollution.

We describe the background, the incentive mechanism and the results. The INSTANT project involved about 14, commuters and succeeded in incentivizing many commuters to travel at uncongested times, thereby significantly reducing their commute times.

Our approach of providing incentives to decongestors contrasts with the current practice of charging congestors. Show Context Citation Context Selfish routing studied the ef-fect of users choosing, from amongst set of alternate routes, that route which minimizes their delay.

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The delay of the resulting Nash allocation of traffic is compare Parameterized Supply Function Bidding: Motivated by market design for electric power systems, we consider a model where a finite number of producers compete to meet an infinitely divisible but inelastic demand for the product.

Each firm is characterized by a production cost that is convex in the output produced, and firms act as profit mGabriel Y. Weintraub Columbia Business School, Uris Broadway, New York, NY , U.S.A.

[Part of thesis finalist of INFORMS George Dantzig Dissertation Award. Finalist paper M&SOM Student Paper Competition.] Goldsmith and Ramesh Johari.

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