Modeling uncertainty in the earth sciences / / Jef Caers

• Record Nr.: UNINA9911019771503321
• Autore: Caers Jef
• Pubbl/distr/stampa: Hoboken, N.J., : Wiley, 2011
• ISBN: 9786613177971; 9781283177979; 1283177978; 9781119998716; 1119998719; 9781119995937; 1119995930; 9781119995920; 1119995922
• Edizione: [1st ed.]
• Descrizione fisica: 1 online resource (240 p.)
• Disciplina: 551.01/5195
• Soggetti: Geology - Mathematical models; Earth sciences - Statistical methods; Three-dimensional imaging in geology; Uncertainty
• Lingua di pubblicazione: Inglese
• Formato: Materiale a stampa
• Livello bibliografico: Monografia
• Note generali: Bibliographic Level Mode of Issuance: Monograph
• Nota di bibliografia: Includes bibliographical references and index.
• Nota di contenuto: Intro -- Modeling Uncertainty in the Earth Sciences -- Contents -- Preface -- Acknowledgements -- 1 Introduction -- 1.1 Example Application -- 1.1.1 Description -- 1.1.2 3D Modeling -- 1.2 Modeling Uncertainty -- Further Reading -- 2 Review on Statistical Analysis and Probability Theory -- 2.1 Introduction -- 2.2 Displaying Data with Graphs -- 2.2.1 Histograms -- 2.3 Describing Data with Numbers -- 2.3.1 Measuring the Center -- 2.3.2 Measuring the Spread -- 2.3.3 Standard Deviation and Variance -- 2.3.4 Properties of the Standard Deviation -- 2.3.5 Quantiles and the QQ Plot -- 2.4 Probability -- 2.4.1 Introduction -- 2.4.2 Sample Space, Event, Outcomes -- 2.4.3 Conditional Probability -- 2.4.4 Bayes' Rule -- 2.5 Random Variables -- 2.5.1 Discrete Random Variables -- 2.5.2 Continuous Random ; Variables -- 2.5.2.1 Probability Density Function (pdf) -- 2.5.2.2 Cumulative Distribution Function -- 2.5.3 Expectation and Variance -- 2.5.3.1 Expectation -- 2.5.3.2 Population Variance -- 2.5.4 Examples of Distribution Functions -- 2.5.4.1 The Gaussian (Normal) Random Variable and Distribution -- 2.5.4.2 Bernoulli Random Variable -- 2.5.4.3 Uniform Random Variable -- 2.5.4.4 A Poisson Random Variable -- 2.5.4.5 The Lognormal Distribution -- 2.5.5 The Empirical Distribution Function versus the Distribution Model -- 2.5.6 Constructing a Distribution Function from Data -- 2.5.7 Monte Carlo Simulation -- 2.5.8 Data Transformations -- 2.6 Bivariate Data Analysis -- 2.6.1 Introduction -- 2.6.2 Graphical Methods: Scatter plots -- 2.6.3 Data Summary: Correlation (Coefficient) -- 2.6.3.1 Definition -- 2.6.3.2 Properties of r -- Further Reading -- 3 Modeling Uncertainty: Concepts and Philosophies -- 3.1 What is Uncertainty? -- 3.2 Sources of Uncertainty -- 3.3 Deterministic Modeling -- 3.4 Models of Uncertainty -- 3.5 Model and Data Relationship.; 3.6 Bayesian View on Uncertainty -- 3.7 Model Verification and Falsification -- 3.8 Model Complexity -- 3.9 Talking about Uncertainty -- 3.10 Examples -- 3.10.1 Climate Modeling -- 3.10.1.1 Description -- 3.10.1.2 Creating Data Sets Using Models -- 3.10.1.3 Parameterization of Subgrid Variability -- 3.10.1.4 Model Complexity -- 3.10.2 Reservoir Modeling -- 3.10.2.1 Description -- 3.10.2.2 Creating Data Sets Using Models -- 3.10.2.3 Parameterization of Subgrid Variability -- 3.10.2.4 Model Complexity -- Further Reading -- 4 Engineering the Earth: Making Decisions Under Uncertainty -- 4.1 Introduction -- 4.2 Making Decisions -- 4.2.1 Example Problem -- 4.2.2 The Language of Decision Making -- 4.2.3 Structuring the Decision -- 4.2.4 Modeling the Decision -- 4.2.4.1 Payoffs and Value Functions -- 4.2.4.2 Weighting -- 4.2.4.3 Trade-Offs -- 4.2.4.4 Sensitivity Analysis -- 4.3 Tools for Structuring Decision Problems -- 4.3.1 Decision Trees -- 4.3.2 Building Decision Trees -- 4.3.3 Solving Decision Trees -- 4.3.4 Sensitivity Analysis -- Further Reading -- 5 Modeling Spatial Continuity -- 5.1 Introduction -- 5.2 The Variogram -- 5.2.1 Autocorrelation in 1D -- 5.2.2 Autocorrelation in 2D and 3D -- 5.2.3 The Variogram and Covariance Function -- 5.2.4 Variogram Analysis -- 5.2.4.1 Anisotropy -- 5.2.4.2 What is the Practical Meaning of a Variogram? -- 5.2.5 A Word on Variogram Modeling -- 5.3 The Boolean or Object Model -- 5.3.1 Motivation -- 5.3.2 Object Models -- 5.4 3D Training Image Models -- Further Reading -- 6 Modeling Spatial Uncertainty -- 6.1 Introduction -- 6.2 Object-Based Simulation -- 6.3 Training Image Methods -- 6.3.1 Principle of Sequential Simulation -- 6.3.2 Sequential Simulation Based on Training Images -- 6.3.3 Example of a 3D Earth Model -- 6.4 Variogram-Based Methods -- 6.4.1 Introduction -- 6.4.2 Linear Estimation.; 6.4.3 Inverse Square Distance -- 6.4.4 Ordinary Kriging -- 6.4.5 The Kriging Variance -- 6.4.6 Sequential Gaussian Simulation -- 6.4.6.1 Kriging to Create a Model of Uncertainty -- 6.4.6.2 Using Kriging to Perform (Sequential) Gaussian Simulation -- Further Reading -- 7 Constraining Spatial Models of Uncertainty with Data -- 7.1 Data Integration -- 7.2 Probability-Based Approaches -- 7.2.1 Introduction -- 7.2.2 Calibration of Information Content -- 7.2.3 Integrating Information Content -- 7.2.4 Application to Modeling Spatial Uncertainty -- 7.3 Variogram-Based Approaches -- 7.4 Inverse Modeling Approaches -- 7.4.1 Introduction -- 7.4.2 The Role of Bayes' Rule in Inverse Model Solutions -- 7.4.3 Sampling Methods -- 7.4.3.1 Rejection Sampling -- 7.4.3.2 Metropolis Sampler -- 7.4.4 Optimization Methods -- Further Reading -- 8 Modeling Structural Uncertainty -- 8.1 Introduction -- 8.2 Data for Structural Modeling in ; the Subsurface -- 8.3 Modeling a Geological Surface -- 8.4 Constructing a Structural Model -- 8.4.1 Geological Constraints and Consistency -- 8.4.2 Building the Structural Model -- 8.5 Gridding the Structural Model -- 8.5.1 Stratigraphic Grids -- 8.5.2 Grid Resolution -- 8.6 Modeling Surfaces through Thicknesses -- 8.7 Modeling Structural Uncertainty -- 8.7.1 Sources of Uncertainty -- 8.7.2 Models of Structural Uncertainty -- Further Reading -- 9 Visualizing Uncertainty -- 9.1 Introduction -- 9.2 The Concept of Distance -- 9.3 Visualizing Uncertainty -- 9.3.1 Distances, Metric Space and Multidimensional Scaling -- 9.3.2 Determining the Dimension of Projection -- 9.3.3 Kernels and Feature Space -- 9.3.4 Visualizing the Data-Model Relationship -- Further Reading -- 10 Modeling Response Uncertainty -- 10.1 Introduction -- 10.2 Surrogate Models and Ranking -- 10.3 Experimental Design and Response Surface Analysis -- 10.3.1 Introduction.; 10.3.2 The Design of Experiments -- 10.3.3 Response Surface Designs -- 10.3.4 Simple Illustrative Example -- 10.3.5 Limitations -- 10.4 Distance Methods for Modeling Response Uncertainty -- 10.4.1 Introduction -- 10.4.2 Earth Model Selection by Clustering -- 10.4.2.1 Introduction -- 10.4.2.2 k-Means Clustering -- 10.4.2.3 Clustering of Earth Models for Response Uncertainty Evaluation -- 10.4.3 Oil Reservoir Case Study -- 10.4.4 Sensitivity Analysis -- 10.4.5 Limitations -- Further Reading -- 11 Value of Information -- 11.1 Introduction -- 11.2 The Value of Information Problem -- 11.2.1 Introduction -- 11.2.2 Reliability versus Information Content -- 11.2.3 Summary of the VOI Methodology -- 11.2.3.1 Steps 1 and 2: VOI Decision Tree -- 11.2.3.2 Steps 3 and 4: Value of Perfect Information -- 11.2.3.3 Step 5: Value of Imperfect Information -- 11.2.4 Value of Information for Earth Modeling Problems -- 11.2.5 Earth Models -- 11.2.6 Value of Information Calculation -- 11.2.7 Example Case Study -- 11.2.7.1 Introduction -- 11.2.7.2 Earth Modeling -- 11.2.7.3 Decision Problem -- 11.2.7.4 The Possible Data Sources -- 11.2.7.5 Data Interpretation -- Further Reading -- 12 Example Case Study -- 12.1 Introduction -- 12.1.1 General Description -- 12.1.2 Contaminant Transport -- 12.1.3 Costs Involved -- 12.2 Solution -- 12.2.1 Solving the Decision Problem -- 12.2.2 Buying More Data -- 12.2.2.1 Buying Geological Information -- 12.2.2.2 Buying Geophysical Information -- 12.3 Sensitivity Analysis -- Index.
• Sommario/riassunto: 'Modeling Uncertainty in the Earth Sciences' highlights the various issues, techniques and practical modeling tools available for modeling the uncertainty of complex earth systems and the impact that it has on practical situations.

How to Practice Academic Medicine and Publish from Developing Countries? : A Practical Guide

• Record Nr.: UNINA9910504285303321
• Autore: Nundy S
• Pubbl/distr/stampa: Singapore, : Springer, 2021
• ISBN: 981-16-5248-1
• Descrizione fisica: 1 online resource (470 p.)
• Classificazione: EDU000000MED000000MED002000STU036000
• Altri autori (Persone): KakarAtul; BhuttaZulfiqar A
• Soggetti: Medicine: general issues; Medical research; Study & learning skills: general; Teaching of a specific subject; Health economics; Medicina; Investigació; Llibres electrònics; Països en vies de desenvolupament
• Lingua di pubblicazione: Inglese
• Formato: Materiale a stampa
• Livello bibliografico: Monografia
• Note generali: Description based upon print version of record.
• Nota di contenuto: Intro -- Foreword -- Acknowledgements -- Why This Book? -- Contents -- About the Authors -- Part I: Introduction -- 1: Academic Medicine and the Social Determinants of Health -- 1.1 What Is Academic Medicine? -- 1.2 What Are the Social Determinants of Health? -- 1.3 How Can Physicians Help Address Social Determinants of Health? -- 1.4 What Are Boyer's Principles of Academic Scholarship? -- 1.5 What Can Be the Role of Academic Medicine in Addressing Social Determinants of Health? -- 1.6 Boyer's Principles of Academic Scholarship, Academic Medicine, and Social Determinants of Health; 1.7 What Is the Way Forward? -- References -- Part II: Background -- 2: Why Should We Publish Papers? -- 2.1 What Is Academic Medicine? -- 2.2 What Are the Duties of a Doctor in an Academic Institution? -- 2.3 Is Publication in Medical Journals a New Phenomenon? -- 2.4 What ; Are the Main Reasons for Publications? -- 2.5 Are There Any Other Reasons for Publications? -- 2.6 Does Publishing Negative Studies Also Give You Fame? -- 2.7 Fraudulent Publication and the Case of Dr. John Darsee? -- 2.8 Conclusions -- References; 3: Overcoming the Initial Barriers to Publication and the Role of the Mentors? -- 3.1 What Is India's Contribution to the World's Medical Publications? -- 3.2 Are the Numbers of Publications from India Increasing? -- 3.3 Is Quantity or Quality More Important in Publications? -- 3.4 Should Faculty and Students from All Medical Colleges Publish Papers. Does this Not Detract from Patient Care and Teaching? -- 3.5 How Much Does the Private Sector Contribute Towards Research?; 3.6 Is the Recent Medical Council of India (MCI) Rule Linking Publications to Faculty Promotion the Main Reason for the Surge in Publication Numbers? -- 3.7 Can We Expect India's Unique Health Issues to Be Solved By the Developed World? -- 3.8 What Are the Various Barriers to Quality Publication Output from India? -- 3.9 How Can a Clinician Take Out Time from His/Her Schedule for Publication? -- 3.10 Do Our Institutes Lack the Infrastructure for Research and Publication? -- 3.11 Do We Need Finances to Start Writing for Publication?; 3.12 Do We Have an Attitude Towards or an Aptitude for Research? -- 3.13 What Is the Role of a Mentor in Publication? -- 3.14 Conclusions -- References -- 4: When Should We Start Doing Research and Publishing Papers? -- 4.1 Is Research Methodology Taught in the Undergraduate Syllabus? -- 4.2 What Is the Brain Drain? -- 4.3 Is an Internship a Good Time To Do Research? -- 4.4 What Are the Requirements of Research During Post-Graduation? -- 4.5 How Can We Increase the Student-Based Research Activities in Our Country?; 4.6 Are There Any Journals That Publish Papers Directed Mainly at Students?
• Sommario/riassunto: This is an open access book. The book provides an overview of the state of research in developing countries – Africa, Latin America, and Asia (especially India) and why research and publications are important in these regions. It addresses budding but struggling academics in low and middle-income countries. It is written mainly by senior colleagues who have experienced and recognized the challenges with design, documentation, and publication of health research in the developing world. The book includes short chapters providing insight into planning research at the undergraduate or postgraduate level, issues related to research ethics, and conduct of clinical trials. It also serves as a guide towards establishing a research question and research methodology. It covers important concepts such as writing a paper, the submission process, dealing with rejection and revisions, and covers additional topics such as planning lectures and presentations. The book will be useful for graduates, postgraduates, teachers as well as physicians and practitioners all over the developing world who are interested in academic medicine and wish to do medical research.