Download or read book Graph Colouring and the Probabilistic Method written by Michael Molloy and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past decade, many major advances have been made in the field of graph coloring via the probabilistic method. This monograph, by two of the best on the topic, provides an accessible and unified treatment of these results, using tools such as the Lovasz Local Lemma and Talagrand's concentration inequality.

Download or read book Local Approximation Techniques in Signal and Image Processing written by Vladimir I︠A︡kovlevich Katkovnik and published by SPIE-International Society for Optical Engineering. This book was released on 2006 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with a wide class of novel and efficient adaptive signal processing techniques developed to restore signals from noisy and degraded observations. These signals include those acquired from still or video cameras, electron microscopes, radar, X-rays, or ultrasound devices, and are used for various purposes, including entertainment, medical, business, industrial, military, civil, security, and scientific. In many cases useful information and high quality must be extracted from the imaging. However, often raw signals are not directly suitable for this purpose and must be processed in some way. Such processing is called signal reconstruction. This book is devoted to a recent and original approach to signal reconstruction based on combining two independent ideas: local polynomial approximation and the intersection of confidence interval rule.

Download or read book CIKM 13 written by CIKM 13 Conference Committee and published by . This book was released on 2013-10-27 with total page 938 pages. Available in PDF, EPUB and Kindle. Book excerpt: CIKM'13: 22nd ACM International Conference on Information and Knowledge Management Oct 27, 2013-Nov 01, 2013 San Francisco, USA. You can view more information about this proceeding and all of ACM�s other published conference proceedings from the ACM Digital Library: http://www.acm.org/dl.

Download or read book Impacts of COVID 19 on food security Panel data evidence from Nigeria written by Amare, Mulubrhan and published by Intl Food Policy Res Inst. This book was released on 2020-08-11 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper combines pre-pandemic face-to-face survey data with follow up phone surveys collected in April-May 2020 to quantify the overall and differential impacts of COVID-19 on household food security, labor market participation and local food prices in Nigeria. We exploit spatial variation in exposure to COVID-19 related infections and lockdown measures along with temporal differences in our outcomes of interest using a difference-in-difference approach. We find that those households exposed to higher COVID-19 cases or mobility lockdowns experience a significant increase in measures of food insecurity. Examining possible transmission channels for this effect, we find that COVID-19 significantly reduces labor market participation and increases food prices. We find that impacts differ by economic activities and households. For instance, lockdown measures increased households' experience of food insecurity by 12 percentage points and reduced the probability of participation in non-farm business activities by 13 percentage points. These lockdown measures have smaller impacts on wage-related activities and farming activities. In terms of food security, households relying on non-farm businesses, poorer households, those with school-aged children, and those living in remote and conflicted-affected zones have experienced relatively larger deteriorations in food insecurity. These findings can help inform immediate and medium-term policy responses, including social protection policies aiming at ameliorating the impacts of the pandemic, as well as guide targeting strategies of governments and international donor agencies by identifying the most impacted sub-populations.

Download or read book Post harvest losses in rural urban value chains Evidence from Ethiopia written by Minten, Bart and published by Intl Food Policy Res Inst. This book was released on 2019-09-12 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: We study post-harvest losses (PHL) in important and rapidly growing rural-urban value chains in Ethiopia. We analyze self-reported PHL from different value chain agents – farmers, wholesale traders, processors, and retailers – based on unique large-scale data sets for two major commercial commodities, the storable staple teff and the perishable liquid milk. PHL in the most prevalent value chain pathways for teff and milk amount to between 2.2 and 3.3 percent and 2.1 and 4.3 percent of total produced quantities, respectively. We complement these findings with primary data from urban food retailers for more than 4,000 commodities. Estimates of PHL from this research overall are found to be significantly lower than is commonly assumed. We further find that the emerging modern retail sector in Ethiopia is characterized by half the level of PHL than are observed in the traditional retail sector. This is likely due to more stringent quality requirements at procurement, sales of more packaged – and therefore better protected – commodities, and better refrigeration, storage, and sales facilities. The further expected expansion of modern retail in these settings should likely lead to a lowering of PHL in food value chains, at least at the retail level.

Download or read book Proof Theory and Automated Deduction written by Jean Goubault-Larrecq and published by Springer Science & Business Media. This book was released on 2001-11-30 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: Interest in computer applications has led to a new attitude to applied logic in which researchers tailor a logic in the same way they define a computer language. In response to this attitude, this text for undergraduate and graduate students discusses major algorithmic methodologies, and tableaux and resolution methods. The authors focus on first-order logic, the use of proof theory, and the computer application of automated searches for proofs of mathematical propositions. Annotation copyrighted by Book News, Inc., Portland, OR

Download or read book Regulating Public Services written by Emmanuelle Auriol and published by Cambridge University Press. This book was released on 2021-10-21 with total page 455 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides the tools needed to analyse the present and the future of economic regulation.

Download or read book Agricultural development New perspectives in a changing world written by Otsuka, Keijiro, ed. and published by Intl Food Policy Res Inst. This book was released on 2021-01-14 with total page 798 pages. Available in PDF, EPUB and Kindle. Book excerpt: Agricultural Development: New Perspectives in a Changing World is the first comprehensive exploration of key emerging issues facing developing-country agriculture today, from rapid urbanization to rural transformation to climate change. In this four-part volume, top experts offer the latest research in the field of agricultural development. Using new lenses to examine today’s biggest challenges, contributors address topics such as nutrition and health, gender and household decision-making, agrifood value chains, natural resource management, and political economy. The book also covers most developing regions, providing a critical global perspective at a time when many pressing challenges extend beyond national borders. Tying all this together, Agricultural Development explores policy options and strategies for developing sustainable agriculture and reducing food insecurity and malnutrition. The changing global landscape combined with new and better data, technologies, and understanding means that agriculture can and must contribute to a wider range of development outcomes than ever before, including reducing poverty, ensuring adequate nutrition, creating strong food value chains, improving environmental sustainability, and promoting gender equity and equality. Agricultural Development: New Perspectives in a Changing World, with its unprecedented breadth and scope, will be an indispensable resource for the next generation of policymakers, researchers, and students dedicated to improving agriculture for global wellbeing.

Download or read book Global Warming and Climate Change written by Emma Carlson Berne and published by Referencepoint Press. This book was released on 2008 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: Throughout the world, the cause and impact of global warming and climate change is being passionately debated. While many claim that a climate crisis is imminent if greenhouse gases are not curbed, others argue that the effects have been overblown. Through objective overviews, primary sources, and full-color illustrations, this title will examine What Is Global Warming and Climate Change? What Are the Consequences of Global Warming? What Are the Controversies Surrounding Global Warming? What Are the Solutions for Global Warming?

Download or read book FDI to Africa written by Ms. Carmen Reinhart and published by International Monetary Fund. This book was released on 2003-01-01 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt: Africa lags behind other regions in attracting foreign direct investment (FDI). In some circumstances, there are obvious explanations for the absence of FDI, such as a high incidence of war. In this paper, we examine the role that monetary and exchange rate policy may have played in explaining this outcome. Specifically, we document the incidence of inflationary episodes and currency crashes in order to compare countries within the region as well as to make comparisons with other regions. Furthermore, since monetary policy can range from very transparent to very opaque, we assess Africa''s track record with dual and parallel markets. We use the parallel market premia as an indicator of the degree of distortions and extent of transparency. Our findings suggest that this is a promising line of inquiry because Africa does stand apart from other regions in this measure of transparency. We also discuss some of the fiscal underpinnings of Africa''s bouts with high inflation.

Download or read book Logic for Computer Science written by Jean H. Gallier and published by Courier Dover Publications. This book was released on 2015-06-18 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt: This advanced text for undergraduate and graduate students introduces mathematical logic with an emphasis on proof theory and procedures for algorithmic construction of formal proofs. The self-contained treatment is also useful for computer scientists and mathematically inclined readers interested in the formalization of proofs and basics of automatic theorem proving. Topics include propositional logic and its resolution, first-order logic, Gentzen's cut elimination theorem and applications, and Gentzen's sharpened Hauptsatz and Herbrand's theorem. Additional subjects include resolution in first-order logic; SLD-resolution, logic programming, and the foundations of PROLOG; and many-sorted first-order logic. Numerous problems appear throughout the book, and two Appendixes provide practical background information.

Download or read book Taxing Africa written by Mick Moore and published by Bloomsbury Publishing. This book was released on 2018-07-15 with total page 289 pages. Available in PDF, EPUB and Kindle. Book excerpt: Taxation has been seen as the domain of charisma-free accountants, lawyers and number crunchers – an unlikely place to encounter big societal questions about democracy, equity or good governance. Yet it is exactly these issues that pervade conversations about taxation among policymakers, tax collectors, civil society activists, journalists and foreign aid donors in Africa today. Tax has become viewed as central to African development. Written by leading international experts, Taxing Africa offers a cutting-edge analysis on all aspects of the continent's tax regime, displaying the crucial role such arrangements have on attempts to create social justice and push economic advancement. From tax evasion by multinational corporations and African elites to how ordinary people navigate complex webs of 'informal' local taxation, the book examines the potential for reform, and how space might be created for enabling locally-led strategies.

Download or read book Modelling And Simulation Of Robot Manipulators A Parallel Processing Approach written by Albert Y Zomaya and published by World Scientific Publishing Company. This book was released on 1993-01-29 with total page 317 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book aims to describe how parallel computer architectures can be used to enhance the performance of robots, and their great impact on future generations of robots. It provides an in-depth, consistent and rigorous treatment of the topic. A clear definition of tools with results is given which can be applied to parallel processing for robot kinematics and dynamics. Another advantageous feature is that the algorithms presented have been implemented using a parallel processing system, unlike many publications in the field which have presented results in only theoretical terms. This book also includes “benchmark” results that can be used for the development of future work, or can serve as a basis for comparison with other work. In addition, it surveys useful material to aid readers in pursuing further research.

Download or read book Dynamics of Parallel Robots written by Sébastien Briot and published by Springer. This book was released on 2015-06-22 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book starts with a short recapitulation on basic concepts, common to any types of robots (serial, tree structure, parallel, etc.), that are also necessary for computation of the dynamic models of parallel robots. Then, as dynamics requires the use of geometry and kinematics, the general equations of geometric and kinematic models of parallel robots are given. After, it is explained that parallel robot dynamic models can be obtained by decomposing the real robot into two virtual systems: a tree-structure robot (equivalent to the robot legs for which all joints would be actuated) plus a free body corresponding to the platform. Thus, the dynamics of rigid tree-structure robots is analyzed and algorithms to obtain their dynamic models in the most compact form are given. The dynamic model of the real rigid parallel robot is obtained by closing the loops through the use of the Lagrange multipliers. The problem of the dynamic model degeneracy near singularities is treated and optimal trajectory planning for crossing singularities is proposed. Lastly, the approach is extended to flexible parallel robots and the algorithms for computing their symbolic model in the most compact form are given. All theoretical developments are validated through experiments.

Download or read book Dynamics of Parallel Robots written by Stefan Staicu and published by Springer. This book was released on 2018-09-14 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book establishes recursive relations concerning kinematics and dynamics of constrained robotic systems. It uses matrix modeling to determine the connectivity conditions on the relative velocities and accelerations in order to compare two efficient energetic ways in dynamics modeling: the principle of virtual work, and the formalism of Lagrange's equations. First, a brief fundamental theory is presented on matrix mechanics of the rigid body, which is then developed in the following five chapters treating matrix kinematics of the rigid body, matrix kinematics of the composed motion, kinetics of the rigid body, dynamics of the rigid body, and analytical mechanics. By using a set of successive mobile frames, the geometrical properties and the kinematics of the vector system of velocities and accelerations for each element of the robot are analysed. The dynamics problem is solved in two energetic ways: using an approach based on the principle of virtual work and applying the formalism of Lagrange's equations of the second kind. These are shown to be useful for real-time control of the robot's evolution. Then the recursive matrix method is applied to the kinematics and dynamics analysis of five distinct case studies: planar parallel manipulators, spatial parallel robots, planetary gear trains, mobile wheeled robots and, finally, two-module hybrid parallel robots.