In wireless communication systems, the network keeps track of a user’s location through an up-to-date user profile stored in various databases. A user profile contains not only a user’s current location information, but also service information, such as billing and authentication. The cov- age area of an access network is divided into registration areas (RAs), and each RA is associated with a location database. The two basic op- ations in mobility management are location update and location lookup. When a user moves across the boundaries of these RAs, the network updates his location information in the pertinent databases. When a caller places a call using the callee’s identification, the network queries the relevant database(s) to obtain the current location and other service information of the callee. The performance of mobility management can be further enhanced by using replicas of user profiles which may be kept at various locations. Replication techniques make profile information more readily available, thus reducing lookup cost and latency, but to keep these replicas c- sistent and fresh, they must be updated whenever the user profile is updated. The principle of replication is to replicate if the benefit of replication is greater than its overhead. The difficulty, however, lies in accurately measuring the benefit and overhead.
The "Gold Standard" in Biochemistry text books, Biochemistry 4e, is a modern classic that has been thoroughly revised. Don and Judy Voet explain biochemical concepts while offering a unified presentation of life and its variation through evolution. Incorporates both classical and current research to illustrate the historical source of much of our biochemical knowledge.
The "Gold Standard" in Biochemistry text books. Biochemistry 4e, is a modern classic that has been thoroughly revised. Don and Judy Voet explain biochemical concepts while offering a unified presentation of life and its variation through evolution. It incorporates both classical and current research to illustrate the historical source of much of our biochemical knowledge.
This volume contains a bibliography of the research on the Dead Sea Scrolls published during the last 25 years, and as such it provides scholars with an indispensable tool for further research. Although originally planned as a continuation of B. Jongeling's A Classified Bibliography of the Finds of the Desert of Judah 1958-1969, the materials are presented in a different way in order to avoid unnecessary duplications of entries. Each bibliographical entry is alphabetically listed in the first part of the book and is provided with an identification number which allows for multiple classifications. The second part offers a sophisticated classification of the materials by themes, topics and key words, but also by manuscript numbers and titles of the compositions as well as by authors.
This is the first textbook to focus on environmental threats to child health. It will interest professionals and graduate students in public health, pediatrics, environmental health, epidemiology, and toxicology. The first three chapters provide overviews of key children's environmental health issues as well as the role of environmental epidemiology and risk assessment in child health protection. Overarching themes are the susceptibility of the rapidly developing fetus and infant to environmental toxicants, the importance of modifying factors(e.g. poverty, genetic traits, nutrition), the role of health outcome and exposure monitoring, uncertainties surrounding environmental exposure limits, and the importance of timely intervention. Later chapters address the health effects of metals, PCBs, dioxins, pesticides, hormonally active agents, radiation, indoor and outdoor air pollution, and water contaminants. In analyzing potential environmental hazards, the author addresses both biologic and epidemiologic evidence, including the likelihood of causal relationships. Among the health outcomes he discusses are developmental, reproductive, and neurobehavioral effects, respiratory disease, cancer, and waterborne infectious diseases. These discussions cover environmental exposure sources/indicators, interventions, and standards, and conclude with a summary of calls for an improved science base to guide public health decisions and protect child health.
CHOICE Award WinnerTransport and transformation processes are key for determining how humans and other organisms are exposed to chemicals. These processes are largely controlled by the chemicals' physical-chemical properties. This new edition of the Handbook of Physical-Chemical Properties and Environmental Fate for Organic Chemicals is a comprehen
Longitudinal data analysis for biomedical and behavioral sciences This innovative book sets forth and describes methods for the analysis of longitudinaldata, emphasizing applications to problems in the biomedical and behavioral sciences. Reflecting the growing importance and use of longitudinal data across many areas of research, the text is designed to help users of statistics better analyze and understand this type of data. Much of the material from the book grew out of a course taught by Dr. Hedeker on longitudinal data analysis. The material is, therefore, thoroughly classroom tested and includes a number of features designed to help readers better understand and apply the material. Statistical procedures featured within the text include: * Repeated measures analysis of variance * Multivariate analysis of variance for repeated measures * Random-effects regression models (RRM) * Covariance-pattern models * Generalized-estimating equations (GEE) models * Generalizations of RRM and GEE for categorical outcomes Practical in their approach, the authors emphasize the applications of the methods, using real-world examples for illustration. Some syntax examples are provided, although the authors do not generally focus on software in this book. Several datasets and computer syntax examples are posted on this title's companion Web site. The authors intend to keep the syntax examples current as new versions of the software programs emerge. This text is designed for both undergraduate and graduate courses in longitudinal data analysis. Instructors can take advantage of overheads and additional course materials available online for adopters. Applied statisticians in biomedicine and the social sciences can also use the book as a convenient reference.
Based on Trisha Greenhalgh's course on teaching evidence based health care, this workbook can be used as a stand alone self learning book, either for groups or individuals. The different units covering areas such as decision analysis and diagnostic testing each contain a published paper with exercises for the user, and critical appraisal checklists. It will act as a complement to the best-selling How to Read a Paper.
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