1 We consider truthful implementation of the socially efficient allocation in an independent private-value environment in which agents receive private information over time. We propose a suitable generalization of the pivot mechanism, based on the marginal contribution of each agent. In the dynamic pivot mechanism, the ex post incentive and ex post participation constraints are satisfied for al...

We propose an account for the acquisition of grammatical relations using the concepts of connectionist learning and a construction-based theory of grammar. The proposal is based on the observation that early production of childhood speech is formulaic and the assumption that the purpose of language is communication. If one assumes that children’s comprehension of multiword speech is not globall...

Analysts are increasingly making use of pivot style Stated Choice (SC) data in the estimation of choice models. These datasets often contain a reference alternative whose attributes remain invariant across replications for the same respondent. This paper presents some evidence to suggest that the standard specification used for such data may not be appropriate. As such, our analysis shows diffe...

We present a semantic analysis of the English it-cleft, concentrating on the exhaustive meaning which the cleft introduces. Our analysis has two novel aspects. The first novel aspect concerns the relationship of the it-cleft with focus. Clefts are generally regarded as focus-marking constructions. On the simplest account, the entire pivot of a cleft is taken to be focused. But in fact this is n...

We participated in SLIR, BLIR(PLIR) and MLIR subtasks at the NTCIR-4 CLIR task. Our IR system can handle queries and documents in Chinese, English and Japanese. The system utilizes multiple language resources (bilingual dictionaries, parallel corpora and machine translation systems) for query translation. We adopted the pivot language approach for C-J and J-C search using English as a pivot lan...

We describe a new information structure composed of multiple intersecting hierarchies, which we call a Polyarchy. Visualizing polyarchies enables use of novel views for discovery of relationships which are very difficult using existing hierarchy visualization tools. This paper will describe the visualization design and system architecture challenges as well as our current solutions. Visual Pivo...

In this paper, we first define the characteristics of a heterogeneous DDBMS (section 1). Then we present the heterogeneous DDBMS we are implementing. This prototype relies on the SIRIUS-DELTA homogeneous DDBMS and two local DBMSs : MRDS (running on a very large computer) and PHLOX (a DBMS for micro-computers). The basis of the system is a pivot system concept (section 2). The description of the...

We study the interplay between principal pivot transform (pivot) and loop complementation for graphs. This is done by generalizing loop complementation (in addition to pivot) to set systems. We show that the operations together, when restricted to single vertices, form the permutation group S3. This leads, e.g., to a normal form for sequences of pivots and loop complementation on graphs. The re...

In [1], the first and third authors investigated the motion of barbells on surfaces of constant curvature. It is natural to extend this study to pendulums. We define the notion of a pendulum on a surface of constant curvature and study the motion of a mass at a fixed distance from a pivot. We consider some special cases for the pendulum. Case 1: a pivot that moves with constant speed along a fi...