We introduce a study of position auctions, with an explicit modeling of user navigation through ads. We refer to our model as the PPA model, since it is most applicable in the context of pay-per-action position auctions. In this model, which is consistent with other recent approaches to user modeling, a typical user searches sequentially over the ordered list of ads. At each point the user has ...

The early part of the frontal plane QRS loop (Frank lead system) was analyzed in 100 consecutive patients with an old inferior myocardial infarction. In order to be included in this study, all cases had to fulfill, at some time, Myers' classical ECG criteria for the diagnosis. The vectorcardiogram was made months to years after the patient's original acute episode. Several scalar and planar par...

3 Examples of VCG mechanisms 5 3.1 Single-item auctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.2 Auctions of identical items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.3 Procurement auctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.4 Public project . . . . . . . . . . . . . . . . . . . . . . . . . ....

Dominance truthful bidding is one of the most desirable features in auction design. In the offline setting, a common technique for ensuring truthful bidding is to start with the VickreyClarke-Groves(VCG) mechanism. However, many difficulties arise when implementing this scheme to an online auction. The main purpose of this paper is to survey recent literature aimed at designing truthful mechani...

Combinatorial auctions have a wide range of real-world applications; yet, designing combinatorial auction mechanisms that simultaneously possess good economic properties and computational tractability remains a major challenge. An auction mechanism consists of an allocation rule and a payment rule. We propose a new framework that uses Structural SVMs to design a payment rule for any given alloc...

The transition of the advertisement market from traditional media to the internet has induced a proliferation of marketing agencies specialized in bidding in the auctions used to sell advertisement space on the web. We analyze how collusive bidding can emerge from bid delegation to a common marketing agency and how this undermines both revenues and efficiency of both the generalized second pric...

INTRODUCTION Vectorcardiography (VCG) may have predictive value in Tetralogy of Fallot (TOF) patients undergoing ventricular arrhythmia inducibility (VAI) electrophysiology studies (EPs). MATERIALS AND METHODS Blinded, retrospective analyses of 37 adult TOF patients undergoing EPs prior to pulmonary valve replacements were performed (21 female, median age 37years). VAI was evaluated from EPs ...

This paper examines an extended double auction model where market clearing is restricted by temporal constraints. It is found that the allocation problem in this model can be effectively transformed into a weighted bipartite matching in graph theory. By using the augmentation technique, we propose a Vickrey-Clarke-Groves (VCG) mechanism in this model and demonstrate the advantages of the paymen...

Omni-optimization assumes a capability to perform any type of optimization, e.g. singleand multi-objective, using single optimization algorithm, or the omni-optimizer. This paper addresses a novel concept for omni-optimization, by coupling vectorization with genetic algorithms (GAs). Vectorization assumes converting constraints into objectives, and their optimization alongside the original set ...