Scalarizing Functions in Bayesian Multiobjective Optimization

Scalarizing functions have been widely used to convert a multiobjective optimization problem into a single objective optimization problem. However, their use in solving (computationally) expensive multi- and many-objective optimization problems in Bayesian multiobjective optimization is scarce. Scalarizing functions can play a crucial role on the quality and number of evaluations required when doing the optimization. In this article, we study and review 15 different scalarizing functions in the framework of Bayesian multiobjective optimization and build Gaussian process models (as surrogates, metamodels or emulators) on them. We use expected improvement as infill criterion (or acquisition function) to update the models. In particular, we compare different scalarizing functions and analyze their performance on several benchmark problems with different number of objectives to be optimized. The review and experiments on different functions provide useful insights when using and selecting a scalarizing function when using a Bayesian multiobjective optimization method

Type-Directed Program Transformations for the Working Functional Programmer

We present preliminary research on Deuce+, a set of tools integrating plain text editing with structural manipulation that brings the power of expressive and extensible type-directed program transformations to everyday, working programmers without a background in computer science or mathematical theory. Deuce+ comprises three components: (i) a novel set of type-directed program transformations, (ii) support for syntax constraints for specifying "code style sheets" as a means of flexibly ensuring the consistency of both the concrete and abstract syntax of the output of program transformations, and (iii) a domain-specific language for specifying program transformations that can operate at a high level on the abstract (and/or concrete) syntax tree of a program and interface with syntax constraints to expose end-user options and alleviate tedious and potentially mutually inconsistent style choices. Currently, Deuce+ is in the design phase of development, and discovering the right usability choices for the system is of the highest priority

Executive Authority to Reform Health: Options and Limitations

Presidential power has provoked increasingly vigorous debate since the turn of this century. In recent years, scholars and lawyers have been grappling with how Congress\u27s dictates may limit the President\u27s Commander-in-Chief power to detain enemy combatants at Guantanamo Bay, to fight wars abroad, and to conduct intelligence activities at home. But policymakers have not yet explored the many possibilities for invoking the President\u27s Take Care power to change health care policy. This paper explores the scope and limits of President Barack Obama\u27s ability to invoke his executive authority to reform health care. Specifically, it identifies ways the Obama Administration can use directives to: (1) expand Medicaid and SCHIP coverage through section 1115 waivers; (2) test quality initiatives through Medicare demonstration authority; (3) expand health information technology; (4) allow drug reimportation and experiment with contracting power under Medicare; (5) enhance patient protections and private coverage requirements; (6) lift coverage restrictions on Medicaid and SCHIP; and (7) build on the health insurance program for federal employees. Consistent with the mission of the Legal Solutions in Health Reform project, this paper does not endorse a particular policy. Instead of recommending what, it explains how

Optimal Inflation Persistence: Ramsey Taxation with Capital and Habits

Ramsey models of fiscal and monetary policy with perfectly-competitive product markets and a fixed supply of capital predict highly volatile inflation with no serial correlation. In this paper, we show that an otherwise-standard Ramsey model that incorporates capital accumulation and habit persistence predicts highly persistent inflation. The result depends on increases in either the ability to smooth consumption or the preference for doing so. The effect operates through the Fisher relationship: a smoother profile of consumption implies a more persistent real interest rate, which in turn implies persistent optimal inflation. Our work complements a recent strand of the Ramsey literature based on models with nominal rigidities. In these models, inflation volatility is lower but continues to exhibit very little persistence. We quantify the effects of habit and capital on inflation persistence and also relate our findings to recent work on optimal fiscal policy with incomplete marketsOptimal fiscal and monetary policy, inflation persistence, Ramsey model, habit formation

Geometry of vanishing flow: a new probe to determine the in-medium nucleon nucleon cross-section

We study the transverse flow throughout the mass range from $^{20}Ne+^{20}Ne$ to $^{131}Xe+^{131}Xe$ as a function of the impact parameter. We find that at smaller impact parameters the flow is negative while going through the impact parameter, transverse flow vanishes at a particular colliding geometry named GVF. We find that the mass dependence of GVF is insensitive to the equation of state and momentum dependent interactions whereas it is quite sensitive to the cross section. So it can act as a useful tool to pin down the nucleon nucleon cross section

Legal Solutions in Health Reform: Executive Authority to Reform Health: Options and Limitations

Examines which healthcare reforms the president can implement without congressional approval and how. Identifies options for promoting and directing agency actions on specific policy goals, as well as legal, budgetary, and legislative constraints

The CKC Challenge: Exploring Tools for Collaborative Knowledge Construction

The great success of Web 2.0 is mainly fuelled by an infrastructure that allows web users to create, share, tag, and connect content and knowledge easily. The tools for developing structured knowledge in this manner have started to appear as well. However, there are few, if any, user studies that are aimed at understanding what users expect from such tools, what works and what doesn't. We organized the Collaborative Knowledge Construction (CKC) Challenge to assess the state of the art for the tools that support collaborative processes for creation of various forms of structured knowledge. The goal of the Challenge was to get users to try out different tools and to learn what users expect from such tools /features that users need, features that they like or dislike. The Challenge task was to construct structured knowledge for a portal that would provide information about research. The Challenge design contained several incentives for users to participate. Forty-nine users registered for the Challenge; thirty three of them participated actively by using the tools. We collected extensive feedback from the users where they discussed their thoughts on all the tools that they tried. In this paper, we present the results of the Challenge, discuss the features that users expect from tools for collaborative knowledge constructions, the features on which Challenge participants disagreed, and the lessons that we learned