Copyright, Potential Markets, and the User Interface: Defining the Scope of the Limited Monopoly

Although most court cases involving copyright protection of the user interface appear to have been decided correctly on their facts, the language of the decisions has left uncertainty as to the scope of protection

Design Features for the Social Web: The Architecture of Deme

We characterize the "social Web" and argue for several features that are desirable for users of socially oriented web applications. We describe the architecture of Deme, a web content management system (WCMS) and extensible framework, and show how it implements these desired features. We then compare Deme on our desiderata with other web technologies: traditional HTML, previous open source WCMSs (illustrated by Drupal), commercial Web 2.0 applications, and open-source, object-oriented web application frameworks. The analysis suggests that a WCMS can be well suited to building social websites if it makes more of the features of object-oriented programming, such as polymorphism, and class inheritance, available to non-programmers in an accessible vocabulary.Comment: Appeared in Luis Olsina, Oscar Pastor, Daniel Schwabe, Gustavo Rossi, and Marco Winckler (Editors), Proceedings of the 8th International Workshop on Web-Oriented Software Technologies (IWWOST 2009), CEUR Workshop Proceedings, Volume 493, August 2009, pp. 40-51; 12 pages, 2 figures, 1 tabl

Evaluating the Effectiveness of Price and Yield Risk Management Products in Reducing Revenue Risk for Southeastern Crop Producers

A non-parametric simulation model incorporating price and yield risk determined gross revenue less risk management costs for corn, cotton, and soybeans produced with and without irrigation. Risk management alternatives protecting price risk, yield risk, and combinations of price and yield were simulated. Combination strategies provided the greatest revenue risk reduction.Risk and Uncertainty,

AN EVALUATION OF ALTERNATIVE CASH, SHARE, AND FLEXIBLE LEASING ARRANGEMENTS FOR SOUTH CAROLINA GRAIN FARMS

A simulation model incorporating stochastic yields, prices, and government payments generates returns for landowners and tenants under cash, share, and flexible leases. Corn, soybeans, wheat, cotton, peanuts, and wheat-double crop soybeans crop enterprises are studied. Alternatives are evaluated by mean returns, coefficient of variation, and certainty equivalent analysis.Land Economics/Use,

The power dissipation method and kinematic reducibility of multiple-model robotic systems

This paper develops a formal connection between the power dissipation method (PDM) and Lagrangian mechanics, with specific application to robotic systems. Such a connection is necessary for understanding how some of the successes in motion planning and stabilization for smooth kinematic robotic systems can be extended to systems with frictional interactions and overconstrained systems. We establish this connection using the idea of a multiple-model system, and then show that multiple-model systems arise naturally in a number of instances, including those arising in cases traditionally addressed using the PDM. We then give necessary and sufficient conditions for a dynamic multiple-model system to be reducible to a kinematic multiple-model system. We use this result to show that solutions to the PDM are actually kinematic reductions of solutions to the Euler-Lagrange equations. We are particularly motivated by mechanical systems undergoing multiple intermittent frictional contacts, such as distributed manipulators, overconstrained wheeled vehicles, and objects that are manipulated by grasping or pushing. Examples illustrate how these results can provide insight into the analysis and control of physical systems