Neuro Anatomy For Teachers
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The document discusses several topics in neuroanatomy relevant for teachers: 1) The right side of the brain controls the left side of the body and vice versa. 2) The limbic system, including the Papez circuit, is involved in emotions and emotional responses. Disorders here can affect behavior. 3) The basal ganglia may play a role in sensory and motor integration, and problems could impact functions like writing.
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Several learning algorithms such as kernel methods, decision tress, and random forests are nonlinear approaches which are widely used to have better performance compared with linear methods. However, with feature engineering techniques like polynomial expansion by mapping the data into a higher dimensional space, the performance of linear methods can be as competitive as those nonlinear methods. As a result, linear methods remain to be very useful given that the training time of linear methods is significantly faster than the nonlinear ones, and the model is just a simple small vector which makes the prediction step very efficient and easy. However, by mapping the data into higher dimensional space, those linear methods are subject to overfitting and instability of coefficients, and those issues can be successfully addressed by penalization methods including Lasso and Elastic-Net. Lasso method with L1 penalty tends to result in many coefficients shrunk exactly to zero and a few other coefficients with comparatively little shrinkage. L2 penalty trends to result in all small but non-zero coefficients. Combining L1 and L2 penalties are called Elastic-Net method which tends to give a result in between. In the first part of the talk, we'll give an overview of linear methods including commonly used formulations and optimization techniques such as L-BFGS and OWLQN. In the second part of talk, we will talk about how to train linear models with Elastic-Net using our recent contribution to Spark MLlib. We'll also talk about how linear models are practically applied with big dataset, and how polynomial expansion can be used to dramatically increase the performance.
DB Tsai is an Apache Spark committer and a Senior Research Engineer at Netflix. He is recently working with Apache Spark community to add several new algorithms including Linear Regression and Binary Logistic Regression with ElasticNet (L1/L2) regularization, Multinomial Logistic Regression, and LBFGS optimizer. Prior to joining Netflix, DB was a Lead Machine Learning Engineer at Alpine Data Labs, where he developed innovative large-scale distributed linear algorithms, and then contributed back to open source Apache Spark project.
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Nowadays we are facing with tasks that are difficult or impossible to be accomplished with an individual agent. Therefore, networked dynamic systems are considered as one approach to perform these type of tasks. A networked dynamic system (NDS) consists of multiple dynamic units that are connected and interact via a network. The network can represent a sensing topology to coordinate a high-level objective, or a communication topology to exchange information between agents.
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Light House Retreats: Plant Medicine Retreat Europe
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The Electrocardiogram - Physiologic Principles
These lecture slides, by Dr Sidra Arshad, offer a quick overview of the physiological basis of a normal electrocardiogram.
Learning objectives:
1. Define an electrocardiogram (ECG) and electrocardiography
2. Describe how dipoles generated by the heart produce the waveforms of the ECG
3. Describe the components of a normal electrocardiogram of a typical bipolar lead (limb II)
4. Differentiate between intervals and segments
5. Enlist some common indications for obtaining an ECG
6. Describe the flow of current around the heart during the cardiac cycle
7. Discuss the placement and polarity of the leads of electrocardiograph
8. Describe the normal electrocardiograms recorded from the limb leads and explain the physiological basis of the different records that are obtained
9. Define mean electrical vector (axis) of the heart and give the normal range
10. Define the mean QRS vector
11. Describe the axes of leads (hexagonal reference system)
12. Comprehend the vectorial analysis of the normal ECG
13. Determine the mean electrical axis of the ventricular QRS and appreciate the mean axis deviation
14. Explain the concepts of current of injury, J point, and their significance
Study Resources:
1. Chapter 11, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 9, Human Physiology - From Cells to Systems, Lauralee Sherwood, 9th edition
3. Chapter 29, Ganong’s Review of Medical Physiology, 26th edition
4. Electrocardiogram, StatPearls - https://www.ncbi.nlm.nih.gov/books/NBK549803/
5. ECG in Medical Practice by ABM Abdullah, 4th edition
6. Chapter 3, Cardiology Explained, https://www.ncbi.nlm.nih.gov/books/NBK2214/
7. ECG Basics, http://www.nataliescasebook.com/tag/e-c-g-basics
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