A Fast and Accurate Cost Model for FPGA Design Space Exploration in HPC Applications

Heterogeneous High-Performance Computing (HPC) platforms present a significant programming challenge, especially because the key users of HPC resources are scientists, not parallel programmers. We contend that compiler technology has to evolve to automatically create the best program variant by transforming a given original program. We have developed a novel methodology based on type transformations for generating correct-by-construction design variants, and an associated light-weight cost model for evaluating these variants for implementation on FPGAs. In this paper we present a key enabler of our approach, the cost model. We discuss how we are able to quickly derive accurate estimates of performance and resource-utilization from the design’s representation in our intermediate language. We show results confirming the accuracy of our cost model by testing it on three different scientific kernels. We conclude with a case-study that compares a solution generated by our framework with one from a conventional high-level synthesis tool, showing better performance and power-efficiency using our cost model based approach

STRINGVACUA: A Mathematica Package for Studying Vacuum Configurations in String Phenomenology

We give a simple tutorial introduction to the Mathematica package STRINGVACUA, which is designed to find vacua of string-derived or inspired four-dimensional N=1 supergravities. The package uses powerful algebro-geometric methods, as implemented in the free computer algebra system Singular, but requires no knowledge of the mathematics upon which it is based. A series of easy-to-use Mathematica modules are provided which can be used both in string theory and in more general applications requiring fast polynomial computations. The use of these modules is illustrated throughout with simple examples.Comment: 21 pages, 9 figure

Revising the U.S. Vertical Merger Guidelines: Policy Issues and an Interim Guide for Practitioners

Mergers and acquisitions are a major component of antitrust law and practice. The U.S. antitrust agencies spend a majority of their time on merger enforcement. The focus of most merger review at the agencies involves horizontal mergers, that is, mergers among firms that compete at the same level of production or distribution. Vertical mergers combine firms at different levels of production or distribution. In the simplest case, a vertical merger joins together a firm that produces an input (and competes in an input market) with a firm that uses that input to produce output (and competes in an output market). Over the years, the agencies have issued Merger Guidelines that outline the type of analysis carried out by the agencies and the agencies’ enforcement intentions in light of state of the law. These Guidelines are used by agency staff in evaluating mergers, as well as by outside counsel and the courts. Guidelines for vertical mergers were issued in 1968 and revised in 1984. However, the Vertical Merger Guidelines have not been revised since 1984. Those Guidelines are now woefully out of date. They do not reflect current economic thinking about vertical mergers. Nor do they reflect current agency practice. Nor do they reflect the analytic approach taken in the 2010 Horizontal Merger Guidelines. As a result, practitioners and firms lack the benefits of up-to-date guidance from the U.S. enforcement agencies

(Un)Complicating Planning and Revising: Metacognition and Problem-Based Tutoring

Why do clients struggle with creating rhetorical plans and globally revising their texts, and how can peer tutors help clients cultivate effective planning and revision practices? Problems with planning and revising differ depending upon the student and the task. Nevertheless, many clients may struggle because they don’t view writing as a problem-solving process that involves addressing a particular audience, selecting and narrowing not only a “topic” but a thesis and support, establishing a purpose for the text, and creating a persona. Instead, clients come to writing with “ideas” for what they want to write about and begin producing text as soon as they feel they have “something to say.” Because clients have paid scant attention to audience, purpose, or persona, as their resulting products show, they have no starting point from which to review how or if their texts have successfully addressed an audience, achieved a purpose, or created an ethos.University Writing Cente

Potential Competitive Effects of Vertical Mergers: A How-To Guide for Practitioners

The purpose of this short article is to aid practitioners in analyzing the competitive effects of vertical and complementary product mergers. It is also intended to assist the agencies if and when they undertake revision of the 1984 U.S. Vertical Merger Guidelines. Those Guidelines are out of date and do not reflect current enforcement or economic thinking about the potential competitive effects of vertical mergers. Nor do they provide the tools needed to carry out a modern competitive effects analysis. This article is intended to partially fill the gap by summarizing the various potential competitive harms and benefits that can occur in vertical mergers and the types of economic and factual analysis of competitive effects that can be applied to those mergers during the HSR review process. The analysis in the article also identifies several legal and policy issues that the agencies would consider when they undertake the process of revising the Vertical Merger Guidelines. The Appendix contains a listing and summary of the vertical merger cases challenged by the DOJ and FTC since 1994

Schools Need Good Leaders Now: State Progress in Creating a Learning-Centered School Leadership System

Examines the progress of each of the SREB states, and of the region as a whole, in ensuring that every school has a leader who can help improve student achievement

Internationalization strategies of frontier Lusophone-African multinational enterprises: comparative case studies of Angola and Mozambique

Internationalization theories suggest that enterprises from emerging and frontier markets will adopt different entry modes than those in advanced economies. There are very few studies to date, however, examining the process of how multi-national enterprises (MNEs) from frontier markets internationalize or evaluating which factors influence their mode of entry into global markets. This research investigates the internationalization strategies of Lusophone Africa MNEs from Angola and Mozambique, more specifically their entry mode, to expand the framework for entry mode strategies to include the motivations and issues of MNEs from emerging and frontier economies. Surveys, as well as in-depth, in-country, qualitative interviews reveal that these frontier and emerging market MNEs opted for equity-based investment strategies as their preferred mode of entry. A significant group second group opted for e-commerce/e-business strategies, and direct and indirect exports. Finally, a smaller portion of the interviewees chose Greenfield investment as a mode of entry. Many of these MNEs could be classified as born global/INV.https://doi.org/10.1080/15475778.2017.1335127Accepted manuscriptPublished versio

The 2020 Vertical Merger Guidelines: A Suggested Revision (March 26, 2020)

The FTC and DOJ requested comments on their draft Vertical Merger Guidelines in January 2020. This article is a complete alternative set of suggested Vertical Merger Guidelines that reflects and supplements the approach explained in the comments submitted by the author along with Jonathan. Baker, Nancy Rose and Fiona Scott Morton, as well as their other comments, and might be read in conjunction with those comments. This suggested revision of the Agencies’ draft expands the list of potential competition harms and provides illustrative examples. It expands and unifies the discussion and treatment of potential competitive benefits. It deletes the quasi-safe harbor and suggests the circumstances under which competitive harms raise lessened concerns on the one hand and heightened concerns on the other