Stochastic control with uncertain macroeconomic parameters

An econometric model of the U.S. economy with random coefficients is solved as a stochastic control problem by augmenting the state vector with random coefficients, linearizing the resulting problem, and obtaining a feedback rule for the augmented problem. The performance of this augment closed loop rule is then compared to regular closed rule with Monte Carlo methods on one-random parameter and three-random parameter examples.     

Subdivision Schemes for Thin Plate Splines

Thin plate splines are a well known entity of geometric design. They are defined as the minimizer of a variational problem whose differential operators approximate a simple notion of bending energy. Therefore, thin plate splines approximate surfaces with minimal bending energy and they are widely considered as the standard "fair" surface model. Such surfaces are desired for many modeling and design applications.
Traditionally, the way to construct such surfaces is to solve the associated variational problem using finite elements or by using analytic solutions based on radial basis functions. This paper presents a novel approach for defining and computing thin plate splines using subdivision methods. We present two methods for the construction of thin plate splines based on subdivision: A globally supported subdivision scheme which exactly minimizes the energy functional as well as a family of strictly local subdivision schemes which only utilize a small, finite number of distinct subdivision rules and approximately solve the variational problem. A tradeoff between the accuracy of the approximation and the locality of the subdivision scheme is used to pick a particular member of this family of subdivision schemes.
Later, we show applications of these approximating subdivision schemes to scattered data interpolation and the design of fair surfaces. In particular we suggest an efficient methodology for finding control points for the local subdivision scheme that will lead to an interpolating limit surface and demonstrate how the schemes can be used for the effective and efficient design of fair surfaces.     

Effects of repeated-dose isradipine on the abuse liability of cocaine.

Despite preclinical studies suggesting that isradipine may antagonize the abuse liability of cocaine, pretreatment with sustained-release isradipine did not reduce euphoric mood in cocaine-using volunteers. This double-blind, within-subject, crossover laboratory study determined whether maximal dose-loading with isradipine could antagonize effects of cocaine in 12 cocaine-dependent research volunteers administered intravenous cocaine doses (0, 0.325, and 0.65 mg/kg) on different days after 5 days of treatment with isradipine or placebo. Isradipine dose was 30 mg sustained release nightly plus 15 mg immediate release 2 hr before cocaine infusion. Cocaine produced dose-related increases in cocaine's subjective effects and a behavioral measure of reinforcement. Isradipine enhanced, rather than antagonized, subjective effects, indicating that isradipine does not antagonize cocaine's abuse liability in dependent research volunteers. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Current accreditation, certification, and licensure activities related to software engineering

The issues associated with the accreditation, certification, and licensure of software engineers are, or at least should be, of great concern to the software engineering community. Perhaps as a result of publicity about safety-critical software disasters in the news media, some state legislatures have considered regulating the practice of software engineering, and some professionals believe that accreditation, certification, and licensure are inevitable. Yet there is no agreed-upon body of knowledge for software engineering on which to base accreditation, certification, or licensure, which makes implementing them difficult at best. In addition, it is not clear that these processes and possible mechanisms to support them are well understood within the software engineering community. This paper surveys how these three processes are conducted in other professions, summarizes the processes as they currently exist for computing in general, identifies some issues that are involved in implementing the processes for software engineering, and suggests possible actions that can be taken by the software engineering profession. The implications of accreditation, certification, and licensure for education are also discussed.