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The Art of Doing Science and Engineering

The Art of Doing Science and Engineering Learning to Learn Richard W.Hamming U.S. Naval Postgraduate School Monterey, California GORDON AND BREACH SCIENCE PUBLISHERS Australia • Canada • China • France • Germany • India • Japan • Luxembourg • Malaysia • The Netherlands • Russia • Singapore • Switzerland • Thailand • United Kingdom

This edition published in the Taylor & Francis e-Library, 2005. “To purchase your own copy of this or any of Taylor & Francis or Routledge’s collection of thousands of eBooks please go to www.eBookstore.tandf.co.uk.” Copyright © 1997 OPA (Overseas Publishers Association) Amsterdam B.V.Published in The Netherlands under license by Gordon and Breach Science Publishers. All rights reserved. No part of this book may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and recording, or by any information storage or retrieval system, without permission in writing from the publisher. Printed in India. Amsteldijk 166 1st Floor 1079 LH Amsterdam The Netherlands British Library Cataloguing in Publication Data Hamming, R.W. (Richard Wesley), 1915– The art of doing science and engineering: learning to 1. Science 2. Engineering learn I. Title 500 ISBN 0-203-45071-X Master e-book ISBN ISBN 0-203-45913-X (Adobe eReader Format) ISBN 90-5699-501-4 (Print Edition)

CONTENTS Preface Introduction n-Dimensional Space Information Theory Foundations of the Digital (Discrete) Revolution 1 Orientation 2 3 History of Computer—Hardware 4 History of Computer—Software 5 History of Computer Applications 6 Limits of Computer Applications—AI—I 7 Limits of Computer Applications—AI—II 8 Limits of Computer Applications—AI—III 9 10 Coding Theory—I 11 Coding Theory—II 12 Error Correcting Codes 13 14 Digital Filters—I 15 Digital Filters—II 16 Digital Filters—III 17 Digital Filters—IV 18 19 20 21 22 Computer Aided Instruction—CAI Simulation—I Simulation—II Simulation—III Fiber Optics vi viii 1 9 17 24 33 40 47 55 57 67 74 81 89 97 107 115 123 128 135 141 151 157

23 Mathematics 24 Quantum Mechanics 25 Creativity 26 Experts 27 Unreliable Data 28 29 You Get What You Measure 30 You and Your Research Systems Engineering Index v 163 171 176 181 187 195 202 209 216

PREFACE After many years of pressure and encouragement from friends, I decided to write up the graduate course in engineering I teach at the U.S.Naval Postgraduate School in Monterey, California. At first I concentrated on all the details I thought should be tightened up, rather than leave the material as a series of somewhat disconnected lectures. In class the lectures often followed the interests of the students, and many of the later lectures were suggested topics in which they expressed an interest Also, the lectures changed from year to year as various areas developed. Since engineering depends so heavily these days on the corresponding sciences, I often use the terms interchangeably. After more thought I decided that since I was trying to teach “style” of thinking in science and engineering, and “style” is an art, I should therefore copy the methods of teaching used for the other arts— once the fundamentals have been learned. How to be a great painter cannot be taught in words; one learns by trying many different approaches that seem to surround the subject. Art teachers usually let the advanced student paint, and then make suggestions on how they would have done it, or what might also be tried, more or less as the points arise in the student’s head—which is where the learning is supposed to occur! In this series of lectures I try to communicate to students what cannot be said in words—the essence of style in science and engineering. I have adopted a loose organization with some repetition since this often occurs in the lectures. There are, therefore, digressions and stories—with some told in two different places—all in the somewhat rambling, informal style typical of lectures. I have used the “story” approach, often emphasizing the initial part of the discovery, because I firmly believe in Pasteur’s remark, “Luck favors the prepared mind.” In this way I can illustrate how the individual’s preparation before encountering the problem can often lead to recognition, formulation, and solution. Great results in science and engineering are “bunched” in the same person too often for success to be a matter of random luck. Teachers should prepare the student for the student’s future, not for the teacher’s past. Most teachers rarely discuss the important topic of the future of their field, and when this is pointed out they usually reply: “No one can know the future.” It seems to me the difficulty of knowing the future does not absolve the teacher from seriously trying to help the student to be ready for it when it comes. It is obvious the experience of an individual is not necessarily that of a class of individuals; therefore, any one person’s projection into the future is apt to be somewhat personal and will not be universally accepted. This does not justify reverting to impersonal surveys and losing the impact of the personal story. Since my classes are almost all carefully selected navy, marine, army, air force, and coast guard students with very few civilians, and, interestingly enough, about 15% very highly selected foreign military, the students face a highly technical future—hence the importance of preparing them for their future and not just our past.

vii The year 2020 seems a convenient date to center the preparation for their future—a sort of 20/20 foresight, as it were. As graduate students working toward a master’s degree, they have the basics well in hand. That leaves me the task of adding “style” to their education, which in practice is usually the difference between an average person and a great one. The school has allowed me great latitude in trying to teach a completely non-technical course; this course “complements” the more technical ones. As a result, my opening words, occasionally repeated, are: “There is really no technical content in the course, though I will, of course, refer to a great deal of it, and hopefully it will generally be a good review of the fundamentals of what you have learned. Do not think it is the content of the course—it is only illustrative material. Style of thinking is the center of the course.” The subtitle of this book, Learning to Learn, is the main solution I offer to help students cope with the rapid changes they will have to endure in their fields. The course centers around how to look at and think about knowledge, and it supplies some historical perspectives that might be useful. This course is mainly personal experiences I have had and digested, at least to some extent. Naturally one tends to remember one’s successes and forget lesser events, but I recount a number of my spectacular failures as clear examples of what to avoid. I have found that the personal story is far, far more effective than the impersonal one; hence there is necessarily an aura of “bragging” in the book that is unavoidable. Let me repeat what I earlier indicated. Apparently an “art”— which almost by definition cannot be put into words—is probably best communicated by approaching it from many sides and doing so repeatedly, hoping thereby students will finally master enough of the art, or if you wish, style, to significantly increase their future contributions to society. A totally different description of the course is: it covers all kinds of things that could not find their proper place in the standard curriculum. The casual reader should not be put off by the mathematics; it is only “window dressing” used to illustrate and connect up with earlier learned material. Usually the underlying ideas can be grasped from the words alone. It is customary to thank various people and institutions for help in producing a book. Thanks obviously go to AT&T Bell Laboratories, Murray Hill, New Jersey, and to the U.S.Naval Postgraduate School, especially the Department of Electrical and Computer Engineering, for making this book possible.

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