David H. Lundy

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Guidance can help learners overcome the difficulties of getting started in a novel domain, but it is often ineffective in promoting learning and transfer. This article examines two aspects of guidance--communicating solution strategies for a problem domain and providing working memory support--in learning a novel problem-solving skill. Subjects in two(More)
INTRODUCTION Near-infrared spectroscopy (NIRS) noninvasively measures peripheral tissue oxygen saturation (StO₂). NIRS may be utilized along with a vascular occlusion test, in which limb blood flow is temporarily occluded and released, to quantify a tissue bed's rate of oxygen exchange during ischemia and recovery. The objective of this study was to test(More)
  • Robert A. Rogowsky, Deanna Tanner Okun, Charlotte R. Lane, Irving A. Williamson, Dean A. Pinkert, Cathy Jabara +8 others
  • 2009
This report describes conditions in the land transport, maritime transport, and electricity infrastructure sectors, and examines their effects on export competitiveness in sub-Saharan Africa (SSA), particularly on the following industries: coffee, shea butter, and certain tropical fruit (pineapples and bananas) in the agricultural sector; natural rubber and(More)
  • Deanna Tanner Okun, Charlotte R. Lane, Irving A. Williamson, Dean A. Pinkert, Robert A. Rogowsky, Robert B. Koopman +7 others
  • 2010
This report describes characteristics of domestic small and medium-sized enterprises (SMEs) and the role they play in U.S. exports. Within the U.S. economy, SMEs account for the vast majority of firms and approximately half the gross domestic product (GDP) generated by nonagricultural sectors. However, SMEs accounted for only about 30 percent of merchandise(More)
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