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Abstract State Machines, Alloy, B, TLA, VDM, and Z - - Bog - Springer International Publishing AG - Plusbog.dk

Potential Functions of Random Walks in Z with Infinite Variance - Kohei Uchiyama - Bog - Springer International Publishing AG - Plusbog.dk

Potential Functions of Random Walks in Z with Infinite Variance - Kohei Uchiyama - Bog - Springer International Publishing AG - Plusbog.dk

This book studies the potential functions of one-dimensional recurrent random walks on the lattice of integers with step distribution of infinite variance. The central focus is on obtaining reasonably nice estimates of the potential function. These estimates are then applied to various situations, yielding precise asymptotic results on, among other things, hitting probabilities of finite sets, overshoot distributions, Green functions on long finite intervals and the half-line, and absorption probabilities of two-sided exit problems. The potential function of a random walk is a central object in fluctuation theory. If the variance of the step distribution is finite, the potential function has a simple asymptotic form, which enables the theory of recurrent random walks to be described in a unified way with rather explicit formulae. On the other hand, if the variance is infinite, the potential function behaves in a wide range of ways depending on the step distribution, which the asymptotic behaviour of many functionals of the random walk closely reflects. In the case when the step distribution is attracted to a strictly stable law, aspects of the random walk have been intensively studied and remarkable results have been established by many authors. However, these results generally do not involve the potential function, and important questions still need to be answered. In the case where the random walk is relatively stable, or if one tail of the step distribution is negligible in comparison to the other on average, there has been much less work. Some of these unsettled problems have scarcely been addressed in the last half-century. As revealed in this treatise, the potential function often turns out to play a significant role in their resolution. Aimed at advanced graduate students specialising in probability theory, this book will also be of interest to researchers and engineers working with random walks and stochastic systems.

DKK 519.00
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Understanding and Preventing Falls - Stephen Z. Fadem - Bog - Springer International Publishing AG - Plusbog.dk

Understanding and Preventing Falls - Stephen Z. Fadem - Bog - Springer International Publishing AG - Plusbog.dk

Despite the fact that elderly persons have a 33-35% chance of falling and becoming injured, most are ill-prepared. According to the World Health Organization, falls cause over 50% of accidental injuries and 39% of fatal injuries in the elderly. They are the fifth leading cause of death in the general population. Falls can be either non-mechanical, related to underlying illness or debilitation, or they can be mechanical, related to accidental trips and slips and caused by environmental factors such as poor lighting, surprise steps, lack of grab bars, and slippery bathroom floors. Non-mechanical falls can be related to cognitive disorders, such as stroke or dementia, or to frailty. They can also be related to over-medicating with sedatives, diabetic medications, or blood pressure therapy. Falls can be the consequence of aging or chronic diseases such as heart disease, diabetes, kidney disease, or cancer. Patients with any of these disorders may have poor muscle tone, walking disorders, or a loss of equilibrium. Mechanical falls may be completely avoided by fall-proofing the home environment. This book outlines several practical tips for eliminating potential home hazards and reviews each of the major causes of falls to help the patient and his or her caregiver, as well as the health provider, prevent falling by adapting one''s lifestyle. The book also covers exercise programs and community programs that can be established and used to minimize the risk of falling in the elderly. Given that falls are common and that the majority of persons who fall are ill-prepared, this book will raise awareness of fall-prevention measures that can help reduce falls and fall-related injuries.

DKK 301.00
1

When Do I Take Which Distribution? - Uwe Wehrspohn - Bog - Springer International Publishing AG - Plusbog.dk

Multi-Modal Face Presentation Attack Detection - Stan Z. Li - Bog - Springer International Publishing AG - Plusbog.dk

Multi-Modal Face Presentation Attack Detection - Stan Z. Li - Bog - Springer International Publishing AG - Plusbog.dk

For the last ten years, face biometric research has been intensively studied by the computer vision community. Face recognition systems have been used in mobile, banking, and surveillance systems. For face recognition systems, face spoofing attack detection is a crucial stage that could cause severe security issues in government sectors. Although effective methods for face presentation attack detection have been proposed so far, the problem is still unsolved due to the difficulty in the design of features and methods that can work for new spoofing attacks. In addition, existing datasets for studying the problem are relatively small which hinders the progress in this relevant domain. In order to attract researchers to this important field and push the boundaries of the state of the art on face anti-spoofing detection, we organized the Face Spoofing Attack Workshop and Competition at CVPR 2019, an event part of the ChaLearn Looking at People Series. As part of this event, we released the largest multi-modal face anti-spoofing dataset so far, the CASIA-SURF benchmark. The workshop reunited many researchers from around the world and the challenge attracted more than 300 teams. Some of the novel methodologies proposed in the context of the challenge achieved state-of-the-art performance. In this manuscript, we provide a comprehensive review on face anti-spoofing techniques presented in this joint event and point out directions for future research on the face anti-spoofing field.

DKK 290.00
1

The A-Z of the PhD Trajectory - Eva O. L. Lantsoght - Bog - Springer International Publishing AG - Plusbog.dk

Data Analysis of Medical Studies - Potter C. Chang - Bog - Springer International Publishing AG - Plusbog.dk

Different Global Journalisms - - Bog - Springer International Publishing AG - Plusbog.dk