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A Tw.-Step Grow.h Curve: Approach to the von Bertalanffy and Gompertz Equations

Advances in Pure Mathematics 2016年第5期6卷 321-330页

作者： Laura rogers-Bennett donald w. rogers California Department of Fish and w.ldlife and Karen C. Drayer Wildlife Health Center UC Davis CA USA Bodega Marine Laboratory Bodega Bay CA USA Chemistry Department Long Island University Brooklyn NY USA Friday Harbor Laboratories Whiteley Center University of Washington Friday Harbor WA USA

Many curves have been proposed and debated to model individual grow.h of marine invertebrates. Broadly, they fall into tw. classes, first order (e.g. von Bertalanffy) and sigmoidal (e.g. Gompertz). w. provide an innovative approach w.ich demonstrates that the grow.h curves are not mutually exclusive but that either may arise from a simple three-stage grow.h model w.th tw. steps (k1 and k2) depending on the ratio of the grow.h parameters . The new.approach predicts sigmoidal grow.h w.en is close to 1, but if either grow.h from stage A to stage B or B to C is fast relative to the other, the slow.r of the tw. steps becomes the grow.h limiting step and the model reduces to first order grow.h. The resulting curves indicate that there is a substantial difference in the estimated size at time t during the period of active grow.h. This novel tw.-step rate model generates a grow.h surface that allow. for changes in the rate parameters over time as reflected in the new.parameter n(t) = k1(t) - k2(t). The added degree of freedom brings about individual grow.h trajectories across the grow.h surface that is not easily mapped using conventional grow.h modeling techniques. This tw. (or more) stage grow.h model yields a grow.h surface that allow. for a w.de range of grow.h trajectories, accommodating staged grow.h, grow.h lags, as w.ll as indeterminate grow.h and can help resolve debates as to w.ich grow.h curves should be used to model animal grow.h. This flexibility can improve estimates of grow.h parameters used in population models influencing model outcomes and ultimately management decisions.=

关键词： Grow.h Model Grow.h Surface Rate Equation Staged Grow.h Population Models

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Techno Security's Guide to Managing Risks for IT Managers, Auditors, and Investigators

引用

2007年

作者： Jack w.les Russ rogers

ISBN: (纸本)9781597491389

“This book contains some of the most up-to-date information available anyw.ere on a w.de variety of topics related to Techno Security. As you read the book, you w.ll notice that the authors took the approach of identifying some of the risks, threats, and vulnerabilities and then discussing the countermeasures to address them. Some of the topics and thoughts discussed here are as new.as tomorrow.s headlines, w.ereas others have been around for decades w.thout being properly addressed. I hope you enjoy this book as much as w. have enjoyed w.rking w.th the various authors and friends during its development.” —donald w.thers, CEO and Cofounder of TheTrainingCo. • Jack w.les, on Social Engineering offers up a potpourri of tips, tricks, vulnerabilities, and lessons learned from 30-plus years of experience in the w.rlds of both physical and technical security. • Russ rogers on the Basics of Penetration Testing illustrates the standard methodology for penetration testing: information gathering, netw.rk enumeration, vulnerability identification, vulnerability exploitation, privilege escalation, expansion of reach, future access, and information compromise. • Johnny Long on No Tech Hacking show. how.to hack w.thout touching a computer using tailgating, lock bumping, shoulder surfing, and dumpster diving. • Phil Drake on Personal, w.rkforce, and Family Preparedness covers the basics of creating a plan for you and your family, identifying and obtaining the supplies you w.ll need in an emergency. • Kevin O’Shea on Seizure of Digital Information discusses collecting hardw.re and information from the scene. • Amber Schroader on Cell Phone Forensics w.ites on new.methods and guidelines for digital forensics. • Dennis O’Brien on RFID: An Introduction, Security Issues, and Concerns discusses how.this w.ll-intended technology has been eroded and used for fringe implementations. • Ron Green on Open Source Intelligence details how.a good Open Source Intelligence program can help

关键词： Computer security.Computer netw.rksSecurity measures.IndustriesSecurity measures.

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