National Security Agency encryption devices
The KY-3 (TSEC/KY-3) is a secure telephone system developed by the U.S. National Security Agency in the early 1960s. It was one of the first widely accepted voice voice encryption systems. The "TSEC" prefix to the model number indicates NSA's Telecommunications Security nomenclature system. It was made by the Bendix Corporation according to specifications of the NSA. According to information on display in 2002 at the NSA's National Cryptologic Museum, the KY-3 provided high fidelity secure voice over special wide-band circuits known as "4-wire dedicated drops", since it used pulse-code modulation encoding for the audio which gave it "high-quality speech". Its overall high power requirements and physical size limited its "tactical" use but gained popularity among executives, diplomats, military leaders and the intelligence community. More than 2,500 units were produced between 1965 and 1967 and it was one of the first telecommunication security devices to use transistors packaged into functional modules. The unit was packaged in a grey relay rack cabinet. It was The KY-3 was replaced by the STU-I and STU-II and remained in use until the late 1980s. (Wikipedia).
System of Equations with Three Equations and Three Variables
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From playlist Systems of Equations
Modification of "Spherical 4R mechanism 2a" and "Spherical 4R mechanism 2b". Because it is a combination of two spherical 4R joints, angles between line connecting two joint centers and the shaft axles must be set equal to each other in order to get constant velocity.
From playlist Mechanisms
On the algebraic fundamental group of surfaces of general type by Margarida Lopes
Algebraic Surfaces and Related Topics PROGRAM URL : http://www.icts.res.in/program/AS2015 DESCRIPTION : This is a joint program of ICTS with TIFR, Mumbai and KIAS, Seoul. The theory of surfaces has been the cradle to many powerful ideas in Algebraic Geometry. The problems in this area
From playlist Algebraic Surfaces and Related Topics
On the algebraic fundamental group of surfaces of general type by Margarida Lopes
Algebraic Surfaces and Related Topics PROGRAM URL : http://www.icts.res.in/program/AS2015 DESCRIPTION : This is a joint program of ICTS with TIFR, Mumbai and KIAS, Seoul. The theory of surfaces has been the cradle to many powerful ideas in Algebraic Geometry. The problems in this area
From playlist Algebraic Surfaces and Related Topics
Electromagnetic Theory by Prof. D.K. Ghosh,Department of Physics,IIT Bombay.For more details on NPTEL visit http://nptel.ac.in
From playlist IIT Bombay: Electromagnetic Theory
RT7.3. Finite Abelian Groups: Convolution
Representation Theory: We define convolution of two functions on L^2(G) and note general properties. Three themes: convolution as an analogue of matrix multiplication, convolution with character as an orthogonal projection on L^2(G), and using using convolution to project onto irreduci
From playlist Representation Theory
How MRI Works - Part 3 - Fourier Transform and K-Space
How MRI works, Part 3 - The Fourier Transform and k-Space Part 1: https://youtu.be/TQegSF4ZiIQ Part 2: https://youtu.be/M7yh0To6Wbs FFT code: https://github.com/thePIRL/fft-code-for-fun/blob/main/FFT%20code 0:00 - Intro 1:00 - The Sinusoid and phasors 5:48 - Fourier Theory 9:05 - The Fo
From playlist Summer of Math Exposition 2 videos
Simultaneous non-vanishing of L-values by Soumya Das
12 December 2016 to 22 December 2016 VENUE Madhava Lecture Hall, ICTS Bangalore The Birch and Swinnerton-Dyer conjecture is a striking example of conjectures in number theory, specifically in arithmetic geometry, that has abundant numerical evidence but not a complete general solution. An
From playlist Theoretical and Computational Aspects of the Birch and Swinnerton-Dyer Conjecture
The thresholding scheme for mean curvature flow as minimizing movement scheme - 2
Speaker: Felix Otto (Max Planck Institute for Mathematics in the Sciences in Leipzig) International School on Extrinsic Curvature Flows | (smr 3209) 2018_06_12-10_45-smr3209
From playlist Felix Otto: "The thresholding scheme for mean curvature flow as minimizing movement scheme", ICTP, 2018
8. Density of States and Statistical Distributions
MIT 2.57 Nano-to-Micro Transport Processes, Spring 2012 View the complete course: http://ocw.mit.edu/2-57S12 Instructor: Gang Chen License: Creative Commons BY-NC-SA More information at http://ocw.mit.edu/terms More courses at http://ocw.mit.edu
From playlist MIT 2.57 Nano-to-Micro Transport Processes, Spring 2012
Heuristics for lambda Invariants - Sonal Jain
Sonal Jain New York University February 17, 2011 The λλ-invariant is an invariant of an imaginary quadratic field that measures the growth of class numbers in cyclotomic towers over the field. It also measures the number of zeroes of an associated pp-adic L-function. In this talk, I will d
From playlist Mathematics
Multivariable Calculus | Three equations for a line.
We present three equations that represent the same line in three dimensions: the vector equation, the parametric equations, and the symmetric equation. http://www.michael-penn.net http://www.randolphcollege.edu/mathematics/
From playlist Lines and Planes in Three Dimensions