Software Engineer Electrical Engineer Technical Writer Einstein the plumber

# Cognitive Science

THE SCIENCE OF COMPREHENSION
How We Understand and Reason About Abstract Concepts
 “It is hard to underestimate how far the idea that concepts are physically embodied, using the sensory motor system of the brain, is from disembodied Enlightenment reason—from the usual view of concepts as disembodied abstractions, entirely separate from the sensory motor system.”—George Lakoff, professor of Cognitive Science, UC Berkeley

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# Computer Science

 THE PENTIUM DIVISION FLAW A computer which can't do math? After two million original Intel Pentium(TM) processors were sold in the first year, it was discovered they gave incorrect results in rare cases. It is quite interesting to study the details behind the flaw, as it brings together many aspects of computer science. Includes a detailed description of the radix 4 SRT division algorithm used by the Pentium.

 HOW COMPUTERS GENERATE RANDOM NUMBERS How do computers, which are completely deterministic machines, generate random numbers? Paradoxes of Probability. A treatise on random numbers and probability theory wouldn't be complete without a number of paradoxes to thoroughly confuse you. Here are a few classic ones. Generating random integers within a desired range Using the C and C++ rand() function

 PAGE FAULTS AND ARRAY ADDRESSING Understanding what a page fault is can sometimes be crucial to writing efficient code. An overview of virtual memory, page faults, and array addressing in code is presented.

 How cyclic redundancy codes work Article describing how Cyclic Redundancy Codes work

 BatteryDeley A low battery alert for laptop computers. (free!)

 EDX Spelling Checker Fast embedded spelling checker code.

 Find Next Prime A routine for finding the next highest prime given a starting number. Useful for making hash tables. Also routines for generating prime numbers and for finding the prime factors of a given number.

 Optimize Function Given a scalar function F, which is a function of several scalar variables {x(1),x(2),...,x(n)}, find the values of {x(1),x(2),...,x(n)} which MINIMIZE the value of function F. Code provides a choice of the Conjugate Direction Method of Fletcher and Reeves (CDM), or POWELL's method.

# Engineering

 Artificial Pancreas System I coded the first version of an Artificial Pancreas System in C# in October of 2011 while working for the University of California Santa Barbara (UCSB) and the Sansum Diebetic Research Institute.
 CONTROLLING THE INVERTED PENDULUM An example of a digital feedback control system. Intense mathematics.

# Documentation

 I was chief editor of the Multi-Edit 2006 User's Manual

DOCUMENTATION I WROTE FOR AUTOHOTKEY OTHER DOCUMENTATION I WROTE

MISCELLANEOUS TOPICS...
 Topics for a High School Math Club The Science of Comprehension: How We Understand and Reason about Abstract Concepts The Problem With Boring American History Recommended Books, Movies, and TV Shows Life Scripts Sex or a Relationship You Can't Please Everyone Why Hyperactive Kids are Treated with Stimulants Why Drive-up ATM Machines Have Braille People who had way too much money and what became of them (under construction)     Discovery Education Homework Help — Math, Science, English, Social Studies, Other Myers-Briggs/Keirsey: Keirsian Temperament Theory The "Volcanic" vs. "Organic" view of Human Nature Topic Index

## A Picture Tour of Santa Barbara, California

A Picture Tour of Santa Barbara, California, from a long time resident's point of view. Get the inside story of what really happens in Santa Barbara.

## HUMOROUS PROSE

Newage music cross reference.
Find more of the newage music you like.

For people who love newage music

### Solutions

 ♠ List of Fun Sites to visit ♣ Spritzy Web Page For People Who Are Sensory Stimulation Deprived For those who feel this page isn't fancy enough and yearn to see the greatest most complex gaudiest graphical page ever I made this one just for you.

 In the beginner’s mind there are many possibilities; In the expert’s mind there are few. —Shunryu Suzuki: Zen Mind, Beginner’s Mind What is to give light must endure burning. —Anton Wildgans1

 Email David Deley: deleyd@ieee.org

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### Miscellaneous:

Depression as a Medical Illness

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Last Update: February 15, 2018

All documents at this site (sitemap) are Copyright © David W. Deley. Permission is granted to use them freely as long as the original author is cited. (Commercial companies should contact me to make sure.)

References:
1. Toward the end of the visit, Einstein asked Leo about his profession. “I'm a plumber,” he said. “Good,” replied Einstein, “Can you tell me where the bathroom is?”
https://web.archive.org/web/20130824064804/http://www.3ap.org/features/leo/leoScanlonBio6.shtml