White (1979) has described a phenomenon in which grey bars replacing segments of the white phase of a square-wave grating appear darker than identical grey bars replacing segments of the black phase of the grating. We have investigated the properties of this effect with a view to discovering the underlying mechanisms. Four experiments are reported which reveal the effects of the heights and wid...

drawal, we cannot accept the notion, implied by Jacquet's formulation, that the only compounds that can induce opiatelike dependence are those that can also produce EMB, and that an ACTH receptor is critically involved in this effect. SHIMON AMIR RICHARD BLAIR PETER SHIZGAL ZALMAN AMIT Concordia University, Centerfor Research on Drug Dependence, 1455 de Maisonneuve Boulevard West, Montreal, Que...

In the past, a retailer usually chose only one market mechanism, either a posted price or an auction, for a product. However, currently some web stores sell a product at a posted price and simultaneously run auctions for the identical product. This new phenomenon has not been studied fully yet. We study a new selling mechanism, Dual Mechanism, where an online retailer combines two famous conven...

This paper proposes a generic data-driven crowd modeling framework to generate crowd behaviors that can match the video data. The proposed framework uses a dual-layer mechanism to model the crowd behaviors. The bottom layer models the microscopic collision avoidance behaviors, while the top layer models the macroscopic crowd behaviors such as the goal selection patterns and the path navigation ...

The paper presents method for hierarchical configurable Petri nets description in VHDL language. Dual model is an alternative way for behavioral description of the discrete control process. Dual model consists of two correlated models: UML state machine diagram and hierarchical configurable Petri net (HCfgPN). HCfgPN are Petri nets variant with direct support of exceptions handling mechanism. L...