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Robert Endre Tarjan is an American computer scientist and mathematician. He is the discoverer of several graph algorithms, including Tarjan's off-line lowest common ancestors algorithm, and co-inventor of both splay trees and Fibonacci heaps. Tarjan is currently the James S. McDonnell Distinguished University Professor of Computer Science at Princeton University, and the Chief Scientist at Intertrust Technologies Corporation.
William Redington Hewlett was an American engineer and the co-founder, with David Packard, of the Hewlett-Packard Company (HP).
David Packard was an American electrical engineer and co-founder, with Bill Hewlett, of Hewlett-Packard (1939), serving as president (1947–64), CEO (1964–68), and Chairman of the Board of HP. He served as U.S. Deputy Secretary of Defense from 1969 to 1971 during the Nixon administration. Packard served as President of the Uniformed Services University of the Health Sciences (USU) from 1976 to 1981 and chairman of its Board of Regents from 1973 to 1982. He was a member of the Trilateral Commission. Packard was the recipient of the Presidential Medal of Freedom in 1988 and is noted for many technological innovations and philanthropic endeavors.
The HP 48 is a series of graphing calculators using Reverse Polish Notation (RPN) and the RPL programming language, designed and produced by Hewlett-Packard from 1990 until 2003. The series includes the HP 48S, HP 48SX, HP 48G, HP 48GX, and HP 48G+, the G models being expanded and improved versions of the S models. The models with an X suffix are expandable via special RAM and ROM cards. In particular, the GX models have more onboard memory than the G models. The G+ models have more onboard memory only. The SX and S models have the same amount of onboard memory.
Stephen Kern Robinson is a retired NASA astronaut.
The Hafele–Keating experiment was a test of the theory of relativity. In October 1971, Joseph C. Hafele, a physicist, and Richard E. Keating, an astronomer, took four cesium-beam atomic clocks aboard commercial airliners. They flew twice around the world, first eastward, then westward, and compared the clocks against others that remained at the United States Naval Observatory. When reunited, the three sets of clocks were found to disagree with one another, and their differences were consistent with the predictions of special and general relativity.
Keith Packard is a software developer, best known for his work on the X Window System.
Frederick Emmons Terman was an American professor and academic administrator. He is widely credited as being the father of Silicon Valley.
A Wien bridge oscillator is a type of electronic oscillator that generates sine waves. It can generate a large range of frequencies. The oscillator is based on a bridge circuit originally developed by Max Wien in 1891 for the measurement of impedances. The bridge comprises four resistors and two capacitors. The oscillator can also be viewed as a positive gain amplifier combined with a bandpass filter that provides positive feedback. Automatic gain control, intentional non-linearity and incidental non-linearity limit the output amplitude in various implementations of the oscillator.
Bradford Parkinson is an American engineer and inventor, retired United States Air Force Colonel and recalled emeritus Professor at Stanford University. He is best known as the lead architect, advocate and developer, with early contributions from Ivan Getting and Roger Easton, of the Air Force NAVSTAR program, better known as Global Positioning System.
David Blair Kirk is a computer scientist and former chief scientist and vice president of architecture at NVIDIA. As of 2019, he is an independent consultant and advisor.
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A frequency synthesizer is an electronic circuit that generates a range of frequencies from a single reference frequency. Frequency synthesizers are used in many modern devices such as radio receivers, televisions, mobile telephones, radiotelephones, walkie-talkies, CB radios, cable television converter boxes, satellite receivers, and GPS systems. A frequency synthesizer may use the techniques of frequency multiplication, frequency division, direct digital synthesis, frequency mixing, and phase-locked loops to generate its frequencies. The stability and accuracy of the frequency synthesizer's output are related to the stability and accuracy of its reference frequency input. Consequently, synthesizers use stable and accurate reference frequencies, such as those provided by crystal oscillators.
Jeanette Jo Epps is an American aerospace engineer and NASA astronaut. Epps received both her M. S. and Ph.D degrees in aerospace engineering from the University of Maryland, where she was part of the rotor-craft research group and was a NASA GSRP Fellow. She was chosen for 20th class of NASA astronauts in 2009, graduating in 2011. Epps currently serves as a member of the ISS Operations Branch and has completed analog astronaut missions, including NEEMO 18 and CAVES 19. She is the second woman and first African-American woman to have participated in CAVES.
An atomic clock is a clock device that uses a hyperfine transition frequency in the microwave, or electron transition frequency in the optical or ultraviolet region of the electromagnetic spectrum of atoms as a frequency standard for its timekeeping element. Atomic clocks are the most accurate time and frequency standards known, and are used as primary standards for international time distribution services, to control the wave frequency of television broadcasts, and in global navigation satellite systems such as GPS.
Leonard Cutler (1928–2006), also known as Leonard S. Cutler, was a pioneer and authority on ultra-precise timekeeping devices and standards, and was well known for his work with quantum-mechanical effects. He was the co-inventor of the HP5060A Cesium Beam Clock, its successor the HP 5071A, and the two-frequency laser inferometer. He has also been praised for his crucial contributions to the design of the Allen Telescope Array.
James Julius Spilker Jr. was an American engineer and a Consulting Professor in the Aeronautics and Astronautics Department at Stanford University. He was one of the principal architects of the Global Positioning System (GPS), and a co-founder of the space communications company Stanford Telecommunications and was most recently executive chairman of AOSense Inc., Sunnyvale, CA.
Norman Paul Jouppi is an American computer scientist.
References
- ↑ "The Origins of GPS" (PDF). Retrieved 2020-08-25.
- ↑ "IEEE Ultrasonics, Ferroelectrics and Frequency Control Society: Robert H. Kern" . Retrieved 2020-08-25.
- ↑ "Robert Henry Kern obituary" . Retrieved 2020-08-25.
