Author
David Korn
Other affiliations: AT&T, New York University, Alcatel-Lucent
Bio: David Korn is an academic researcher from Bell Labs. The author has contributed to research in topics: Airfoil & Transonic. The author has an hindex of 13, co-authored 22 publications receiving 749 citations. Previous affiliations of David Korn include AT&T & New York University.
Papers
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TL;DR: A theorem is proved which shows that a set of independent transforms can be computed by performing a partial transformation on a single vector and this theorem also applies to nonvector machines.
Abstract: Two algorithms are presented for performing a Fast Fourier Transform on a vector computer and are compared on the Control Data Corporation STAR-100. The relative merits of the two algorithms are shown to depend upon whether only a few or many independent transforms are desired. A theorem is proved which shows that a set of independent transforms can be computed by performing a partial transformation on a single vector. The results of this theorem also apply to nonvector machines and have reduced the average time per transform by a factor of two on the CDC 6600 computer.
74 citations
Book•
01 Jan 1972
TL;DR: In this paper, a computer program for the design of shockless transonic airfoils using the hodograph transformation and analytic continuation into the complex domain is presented, which can be used to ascertain whether the profiles behave well at off-design conditions.
Abstract: Mathematical methods for the design of supercritical wings, which depend on the numerical solution of the partial differential equations of two-dimensional gas dynamics, are developed. The main contribution is a computer program for the design of shockless transonic airfoils using the hodograph transformation and analytic continuation into the complex domain. The mathematical theory is described, and a manual for users of the programs is provided. Numerical examples are given and computational results are discussed, and the computer programs themselves are listed. The analysis routine can be used to ascertain whether the profiles behave well at off-design conditions, or to smooth coordinates and obtain a desirable shape more quickly when perfectly shockless flow is not essential.
59 citations
Book•
01 Jan 1977TL;DR: This chapter discusses the design of transonic airfoils using the New Design Code K, and some of the techniques used in this design, including TAPE7, which was developed in this chapter.
Abstract: The book describes recent computational flow research on the design and analysis of supercritical wing sections. The central object is a detailed description of a supercritical wing design code based on the concept of designing a shockless airfoil so that its pressure distribution very nearly takes on prescribed data. The accompanying two-dimensional analysis code with fast Poisson solver is also described. FORTRAN listings are included along with a users manual for the design code. Airfoils designed with the new code and data from analysis and experiment are provided. A brief description of the method of complex characteristics is also given.
39 citations
Patent•
19 Nov 1993TL;DR: In this article, a library of system calls used by the processes is replaced by a dynamically-linked library which performs the system calls and also sends messages indicating that the calls have been performed, and a display system which responds to the messages by making a graphical display showing the current state of the system of processes.
Abstract: Techniques for analyzing and controlling operation of a system of cooperating processes. A library of system calls used by the processes is replaced by a dynamically-linked library which performs the system calls and also sends messages indicating that the system calls have been performed. The messages are received by a display system which responds to the messages by making a graphical display showing the current state of the system of processes. The graphical display displays the system of processes as a tree. Nodes in the tree represent the processes in the system and resources such as files used by the processes; edges in the tree represent relationships between processes and other processes or resources. Users may control which system calls result in messages, may control the rate at which the display system responds to the messages, and may also control execution of the processes.
30 citations
Cited by
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TL;DR: A package of practical tools and libraries for manipulating graphs and their drawings that includes stream and event interfaces for graph operations, high-quality static and dynamic layout algorithms, and the ability to handle sizable graphs is described.
Abstract: SUMMARY We describe a package of practical tools and libraries for manipulating graphs and their drawings. Our design, which aimed at facilitating the combination of the package components with other tools, includes stream and event interfaces for graph operations, high-quality static and dynamic layout algorithms, and the ability to handle sizable graphs. We conclude with a description of the applications of this package to a variety of software engineering tools. Copyright c 1999 John Wiley & Sons, Ltd.
1,237 citations
Book•
01 Apr 1982
TL;DR: In this article, the authors present a method for numerique numeriques for programmation with differences between finies and viscosite reference records. But the method is not presented in detail.
Abstract: Keywords: methodes : numeriques ; programmation ; differences : finies ; methode : integrale ; ecoulement : incompressible ; ecoulement : compressible ; ecoulement : visqueux ; mecanique des : fluides ; viscosite Reference Record created on 2005-11-18, modified on 2016-08-08
1,196 citations
01 Jan 1985
TL;DR: In this article, the authors present a method for numerique numeriques for programmation with differences between finies and viscosite reference records. But the method is not presented in detail.
Abstract: Keywords: methodes : numeriques ; programmation ; differences : finies ; methode : integrale ; ecoulement : incompressible ; ecoulement : compressible ; ecoulement : visqueux ; mecanique des : fluides ; viscosite Reference Record created on 2005-11-18, modified on 2016-08-08
1,182 citations