The Experts below are selected from a list of 11283 Experts worldwide ranked by ideXlab platform
Shai Shalevshwartz - One of the best experts on this subject based on the ideXlab platform.
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online learning theory algorithms and applications
2007Co-Authors: Shai ShalevshwartzAbstract:Online learning is the process of answering a sequence of questions given knowledge of the correct answers to previous questions and possibly additional available information. Answering questions in an intelligent fashion and being able to make rational decisions as a result is a basic feature of everyday life. Will it Rain Today (so should I take an umbrella)? Should I fight the wild animal that is after me, or should I run away? Should I open an attachment in an email message or is it a virus? The study of online learning algorithms is thus an important domain in machine learning, and one that has interesting theoretical properties and practical applications. This dissertation describes a novel framework for the design and analysis of online learning algorithms. We show that various online learning algorithms can all be derived as special cases of our algorithmic framework. This unified view explains the properties of existing algorithms and also enables us to derive several new interesting algorithms. Online learning is performed in a sequence of consecutive rounds, where at each round the learner is given a question and is required to provide an answer to this question. After predicting an answer, the correct answer is revealed and the learner suffers a loss if there is a discrepancy between his answer and the correct one. The algorithmic framework for online learning we propose in this dissertation stems from a connection that we make between the notions of regret in online learning and weak duality in convex optimization. Regret bounds are the common thread in the analysis of online learning algorithms. A regret bound measures the performance of an online algorithm relative to the performance of a competing prediction mechanism, called a competing hypothesis. The competing hypothesis can be chosen in hindsight from a class of hypotheses, after observing the entire sequence of question- answer pairs. Over the years, competitive analysis techniques have been refined and extended to numerous prediction problems by employing complex and varied notions of progress toward a good competing hypothesis. We propose a new perspective on regret bounds which is based on the notion of duality in convex optimization. Regret bounds are universal in the sense that they hold for any possible fixed hypothesis in a given hypothesis class. We therefore cast the universal bound as a lower bound
Wang Rusong - One of the best experts on this subject based on the ideXlab platform.
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ecosystem services and their economic valuation
World Sci-tech R & D, 2000Co-Authors: Wang RusongAbstract:Ecosystem services are the conditions and processing through which natural ecosystems, and the species that make them up, sustain and fulfill human life. They not only supply to human with the production of ecosystem goods, such as food, forage, timber, biomass fuels, natural fiber, and pharmaceuticals. Ecosystems also perform fundamental life support services, which include the purification of air and water, detoxification and decomposition of wastes, regulation of climate, regeneration of soil fertility, and production and maintenance of biodiversity, mitigation of floods, droughts, the erosive forces of wind and Rain. Today, escalating impacts of human activities on forests, wetlands, and other natural ecosystems imperil the delivery of such services. Now it is recognized that ecosystem services are essential to civilization and the core issue for sustainable development. In this paper, the advances in ecosystem services characteristics, their economic valuation and their relations to sustainable development are literaturally surveyed and discussed.
Batún Alpuche Iván - One of the best experts on this subject based on the ideXlab platform.
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Karst water resource management and sustainable educational practices in nine Yucatec Maya Communities
Scholar Commons, 2020Co-Authors: Landry Montes, Khristin Nicole, Mcanany, Patricia A., Clark, Dylan J., Batún Alpuche IvánAbstract:The karst landscape of Yucatán, Mexico is dotted with thousands of sinkholes that provide access to fresh water. These features, called “cenotes” in Spanish and “dz’onot” in Yucatec Maya, range from subterranean caverns with well-developed speleothems to open-air sinkholes. While there is a variety of cenote types, all are connected to the subterranean freshwater aquifer. The interconnectivity of cenotes magnifies the impact of cenote contamination. Because of their significance as water sources, cenotes were conceived by ancient Maya peoples as important portals to powerful supernatural forces and guardians of Rain. Today, cenotes remain culturally important and are located near the center of most Maya communities, although wells have replaced them for access to potable water. Many cenotes are now developed for tourism and serve as important economic resources. Despite their cultural and economic importance, cenotes are increasingly endangered by contamination caused by industrial and agricultural run-off, trash dumping, chemical and waste contamination, and unsustainable recreational use. One approach to mitigating these threats is through community-driven educational programming aimed at mobilizing young people to study and conserve cenotes in their communities. In 2018, InHerit: Indigenous Heritage Passed to Present, an applied anthropology program at the University of North Carolina at Chapel Hill collaborated with students and faculty at the Universidad de Oriente in Valladolid, Yucatan, along with teachers at nine public secondary schools in Maya communities to develop sustainable experiential education curriculum materials related to sinkhole conservation, water quality monitoring, and cultural heritage. Supported by funding from a National Geographic Society grant, students and teachers at nine middle schools participated in implementing this project. Here we discuss the goals and methods employed, as well as how this project has resulted in transforming students’ ideas about water conservation, increased validation and application of Indigenous knowledge for cenote conservation
Landry Montes, Khristin Nicole - One of the best experts on this subject based on the ideXlab platform.
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Karst water resource management and sustainable educational practices in nine Yucatec Maya Communities
Scholar Commons, 2020Co-Authors: Landry Montes, Khristin Nicole, Mcanany, Patricia A., Clark, Dylan J., Batún Alpuche IvánAbstract:The karst landscape of Yucatán, Mexico is dotted with thousands of sinkholes that provide access to fresh water. These features, called “cenotes” in Spanish and “dz’onot” in Yucatec Maya, range from subterranean caverns with well-developed speleothems to open-air sinkholes. While there is a variety of cenote types, all are connected to the subterranean freshwater aquifer. The interconnectivity of cenotes magnifies the impact of cenote contamination. Because of their significance as water sources, cenotes were conceived by ancient Maya peoples as important portals to powerful supernatural forces and guardians of Rain. Today, cenotes remain culturally important and are located near the center of most Maya communities, although wells have replaced them for access to potable water. Many cenotes are now developed for tourism and serve as important economic resources. Despite their cultural and economic importance, cenotes are increasingly endangered by contamination caused by industrial and agricultural run-off, trash dumping, chemical and waste contamination, and unsustainable recreational use. One approach to mitigating these threats is through community-driven educational programming aimed at mobilizing young people to study and conserve cenotes in their communities. In 2018, InHerit: Indigenous Heritage Passed to Present, an applied anthropology program at the University of North Carolina at Chapel Hill collaborated with students and faculty at the Universidad de Oriente in Valladolid, Yucatan, along with teachers at nine public secondary schools in Maya communities to develop sustainable experiential education curriculum materials related to sinkhole conservation, water quality monitoring, and cultural heritage. Supported by funding from a National Geographic Society grant, students and teachers at nine middle schools participated in implementing this project. Here we discuss the goals and methods employed, as well as how this project has resulted in transforming students’ ideas about water conservation, increased validation and application of Indigenous knowledge for cenote conservation
Mcanany, Patricia A. - One of the best experts on this subject based on the ideXlab platform.
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Karst water resource management and sustainable educational practices in nine Yucatec Maya Communities
Scholar Commons, 2020Co-Authors: Landry Montes, Khristin Nicole, Mcanany, Patricia A., Clark, Dylan J., Batún Alpuche IvánAbstract:The karst landscape of Yucatán, Mexico is dotted with thousands of sinkholes that provide access to fresh water. These features, called “cenotes” in Spanish and “dz’onot” in Yucatec Maya, range from subterranean caverns with well-developed speleothems to open-air sinkholes. While there is a variety of cenote types, all are connected to the subterranean freshwater aquifer. The interconnectivity of cenotes magnifies the impact of cenote contamination. Because of their significance as water sources, cenotes were conceived by ancient Maya peoples as important portals to powerful supernatural forces and guardians of Rain. Today, cenotes remain culturally important and are located near the center of most Maya communities, although wells have replaced them for access to potable water. Many cenotes are now developed for tourism and serve as important economic resources. Despite their cultural and economic importance, cenotes are increasingly endangered by contamination caused by industrial and agricultural run-off, trash dumping, chemical and waste contamination, and unsustainable recreational use. One approach to mitigating these threats is through community-driven educational programming aimed at mobilizing young people to study and conserve cenotes in their communities. In 2018, InHerit: Indigenous Heritage Passed to Present, an applied anthropology program at the University of North Carolina at Chapel Hill collaborated with students and faculty at the Universidad de Oriente in Valladolid, Yucatan, along with teachers at nine public secondary schools in Maya communities to develop sustainable experiential education curriculum materials related to sinkhole conservation, water quality monitoring, and cultural heritage. Supported by funding from a National Geographic Society grant, students and teachers at nine middle schools participated in implementing this project. Here we discuss the goals and methods employed, as well as how this project has resulted in transforming students’ ideas about water conservation, increased validation and application of Indigenous knowledge for cenote conservation
