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One of the primary challenges of developmental robotics is the question of how to learn and represent increasingly complex behavior in a self-motivated, open-ended way. 2004) have recently presented an algorithm for intrin-sically motivated reinforcement learning that strives to achieve broad competence in an environment in a task-nonspecific manner by(More)
—One important role of an agent's motivational system is to choose, at any given moment, which of a number of skills the agent should attempt to improve. Many researchers have suggested " intrinsically motivated " systems that receive internal reward for model learning progress, but for the most part this notion has not been applied with respect to skill(More)
  • A E Stout
  • 1997
Low-income women are among those at risk for delivering low-birth-weight babies (Lia-Hoagberg et al., 1990; Miller, Magolis, Schwethelm, & Smith, 1989; St. Clair, Smeriglio, Alexander, Connell, & Niebyl, 1990). These women tend to use prenatal care less often, perceive more barriers to care, have less positive reinforcement for receiving care, have less(More)
To my family. ACKNOWLEDGEMENTS In December 2002 I travelled to Vancouver, Canada, with my sister. When our grandmother was a child, she and her family emigrated from Sweden to Canada and settled near a small town called Hope in the vicinity of Vancouver. After the depression struck in 1929, the financial prospects were poor, so the family decided to return(More)
Swarthmore's entries to this year's AAAI Mobile Robot competition won second place in the Urban Search and Rescue event and Third Place in the Robot Host competition. This article describes the features of Frodo and Rose, the two-robot team, and discusses their performance. The most important design feature that made the robots successful was a modular(More)
As artificial life systems grow in number and sophistication, it is becoming increasingly important that the field agree on principled metrics for evaluating them. This report describes a series of experiments validating the evolutionary activity statistics developed by Bedau and his colleagues [2, 3, 4]. The work described herein was motivated by a feeling(More)
Under the Higher Education Contribution Scheme graduates face a sharp discontinuity in their taxable incomes. At the first repayment threshold, they are required to pay a percentage of their entire income to reduce their debts. This results in an extremely high effective marginal tax rate. Using a sample of taxpayer returns we investigate whether taxpayers(More)
Increased cellular production of vascular endothelial growth factor (VEGF) is responsible for the development and progression of multiple cancers and other neovascular conditions, and therapies targeting post-translational VEGF products are used in the treatment of these diseases. Development of methods to control and modify the transcription of the VEGF(More)
To my family and friends. ACKNOWLEDGEMENTS This dissertation, while it bears only my name, is the culmination of the support I have received from a bunch of people. My interest in robotics started in my undergraduate years in India, while taking a course on Artificial Intelligence. It has been nearly nine years since I took that course, and my interest in(More)