Leiserson, Charles EricOverview
Publication Timeline
Most widely held works by
Charles Eric Leiserson
Introduction to algorithms
by Thomas H Cormen
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Book
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91 editions published between 1989 and 2011 in 4 languages and held by 1,346 WorldCat member libraries worldwide Some books on algorithms are rigorous but incomplete; others cover masses of material but lack rigor. Introduction to Algorithms uniquely combines rigor and comprehensiveness. The book covers a broad range of algorithms in depth, yet makes their design and analysis accessible to all levels of readers. Each chapter is relatively selfcontained and can be used as a unit of study. The algorithms are described in English and in a pseudocode designed to be readable by anyone who has done a little programming. The explanations have been kept elementary without sacrificing depth of coverage or mathematical rigor.  The first edition became a widely used text in universities worldwide as well as the standard reference for professionals. The second edition featured new chapters on the role of algorithms, probabilistic analysis and randomized algorithms, and linear programming. The third edition has been revised and updated throughout. It includes two completely new chapters, on van Emde Boas trees and multithreaded algorithms, and substantial additions to the chapter on recurrences (now called "DivideandConquer"). It features improved treatment of dynamic programming and greedy algorithms and a new notion of edgebased flow in the material on flow networks. Many new exercises and problems have been added for this edition
Areaefficient VLSI computation
by Charles Eric Leiserson
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Book
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15 editions published between 1981 and 1987 in English and Undetermined and held by 320 WorldCat member libraries worldwide
Advanced research in VLSI : proceedings of the fourth MIT conference, April 79, 1986
by Massachusetts Institute of Technology
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Book
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6 editions published in 1986 in English and Undetermined and held by 229 WorldCat member libraries worldwide
Retiming synchronous circuitry
by Charles Eric Leiserson
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Book
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7 editions published between 1986 and 1988 in English and Undetermined and held by 26 WorldCat member libraries worldwide This paper shows how the technique of retiming can be used to transform a given synchronous circuit into a more efficient circuit under a variety of different cost criteria. We model a circuit as a graph, and we give an O(/V/ /E/lg/V/) algorithm for determining an equivalent circuit with the smallest possible clock period. We show that the problem of determining an equivalent retimed circuit with minimum state (total number of registers) is polynomialtime solvable. This result yields a polynomialtime optimal solution to the problem of pipelining combinational circuitry with minimum register cost. We also give a characterization of optimal retiming based on an efficiently solvable mixedinteger linear programming problem. (Author)
Introduzione agli algoritmi e strutture dati
by Thomas H Cormen
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Book
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5 editions published between 1994 and 2010 in Italian and English and held by 20 WorldCat member libraries worldwide
Optimizing synchronous systems
by Charles Eric Leiserson
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Book
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5 editions published between 1981 and 1982 in English and Undetermined and held by 17 WorldCat member libraries worldwide
Optimal placement for river routing
by Charles Eric Leiserson
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Book
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5 editions published between 1981 and 1987 in English and held by 12 WorldCat member libraries worldwide
Waferscale integration of systolic arrays
by Frank Thomson Leighton
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Book
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5 editions published between 1983 and 1985 in English and held by 11 WorldCat member libraries worldwide VLSI technologies are fast developing waferscale integration. Rather than partitioning a silicon wafer into chips as is usually done, the idea behind waferscale integration is to assemble an entire system (or network of chips) on a single wafer, thus avoiding the costs and performance loss associated with individual packaging of chips. A major problem with assembling a large system of microprocessors on a single wafer, however, is that some of the processors, or cells, on the wafer are likely to be defective. In the paper, we describe practical procedures for integrating waferscale systems 'around' such faults. The procedures are designed to minimize the length of the longest wire in the system, thus minimizing the communication time between cells. Although the underlying network problems are NPcomplete, we prove that the procedures are reliable by assuming a probabilistic model of cell failure. We also discuss applications of this work to problems in VLSI layout theory, graph theory, faulttolerant systems and planar geometry
A mixedinteger linear programming problem which is efficiently solvable
by Charles Eric Leiserson
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Book
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5 editions published between 1984 and 1987 in English and held by 11 WorldCat member libraries worldwide Much research has centered on the problem of finding shortest paths in graphs. It is well known that there is a direct correspondence between the single source shortestpaths problem and the following simple linear programming problems: Let S be a set of linear inequalities of the form x sub j  x sub i <or = (a sub ij, where the x sub i are unknowns and the a sub ij are given real constants. Determine a set of values for the x sub i such that the inequalities in S are satisfied, or determine that no such values exist. This paper considers the mixedinteger linear programming variant of this problem in which some (but not necessarily all) of the x sub i are required to be integers. The problem arises in the context of synchronous circuit optimization but it has applications to PERT scheduling and VLSI layout compaction as well. Keywords: Algorithms, Combinatorial optimization
Randomized routing on fattrees
by Ronald I Greenberg
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Book
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4 editions published between 1985 and 1986 in English and held by 8 WorldCat member libraries worldwide Fattrees are a class of routing networks for hardwareefficient parallel computation. This paper presents a randomized algorithm for routing messages on a fattree. The quality of the algorithm is measured in terms of the load factor of a set of messages to be routed, which is a lower bound on the time required to deliver the messages. This document shows that if a set of messages has load factor lambda on a fattree with n processors, the number of delivery cycles (routing attempts) that the algorithm requires is O(lambda + lg n lg lg n) with probability 1O(1/n). The best previous bound was O(lambda lg n) for the offline problem where switch settings can be determined in advance. In a VLSIlike model where hardware cost is equated with physical volume, the routing algorithm demonstrates that fattrees are universal routing networks in the sense that any routing network can be efficiently simulated by a fattree of comparable hardware cost
The organization of permutation architectures with bussed interconnections
by Joe Kilian
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Book
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4 editions published between 1987 and 1989 in English and held by 8 WorldCat member libraries worldwide This paper explores the problem of efficiently permuting data stored in VLSI chips in accordance with a predetermined set of permutations. By connecting chips with shared bus interconnections, as opposed to pointtopoint interconnections, we show the number of pins per chip can often be reduced. We also consider uniform permutation architectures that realize permutations in several clock ticks, instead of one, and show that further savings in the number of pins per chip can be obtained. Keywords: Barrel shifter, Bussed interconnections, Cyclic shifter, Difference cover, Difference set, Group theory, Permutation, Permutation architecture, Projective plane, Specialpurpose architecture, Uniform architecture
A spaceefficient algorithm for finding the connected components of rectangles in the plane
by Charles Eric Leiserson
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Book
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2 editions published in 1987 in English and held by 7 WorldCat member libraries worldwide An algorithm is presented for determining the connectivity of a set of N rectangles in the plane, a problem central to avoiding aliasing in VLSI design rule checkers. Previous algorithms for this problem either worked slowly with a small amount of primary memory space, or worked quickly but used more space. Our algorithm uses O(W) primary memory space, where W, the scan width, is the maximum number of rectangles to cross any vertical cut. The algorithm runs in O(N 1g N) time and requires no more than O(N) transfers between primary and secondary memory. Keywords: Very large scale integration; Computational geometry; Design rule checking; Algorithms; Rectangles; Connected components; Scanning
A hyperconcentrator switch for routing bitserial messages
by Thomas H Cormen
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Book
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3 editions published between 1986 and 1987 in English and held by 7 WorldCat member libraries worldwide In highly parallel message routing networks, it is sometimes desirable to concentrate relatively few messages on many wires onto fewer wires. We have designed a VLSI chip for this purpose which is capable of concentrating bitserial messages quickly. This hyperconcerntrator switch has a highly regular layout using ratioed nMOS and takes advantage of the relatively fast performance of large fanin NOR gates in this technology. A signal incurs exactly 21gn gate delays through the switch, where n is the number of inputs to the circuit. The architecture generalizes to domino CMOS as well. Keywords include: Message routing network, bitserial message, concentrator switch, hyperconcentrator switch, superconcentrator switch butterfly network, merge sort, and VLSI
Communicationefficient parallel graph algorithms
by Charles Eric Leiserson
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Book
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2 editions published in 1986 in English and held by 7 WorldCat member libraries worldwide Communication bandwidth is a resource ignored by most parallel randomaccess machine (PRAM) models. This paper shows that many graph problems can be solved in parallel, not only with polylogarithmic performance, but with efficient communication at each step of the computation. We measure the communication requirements of an algorithm in a model called the distributed randomaccess machine (DRAM), in which communication cost is measured in terms of the congestion of memory accesses across cuts of an underlying network. The algorithms are based on a communicationefficient variant of the tree contraction technique due to Miller and Reif. (Author)
VLSI theory and parallel supercomputing
by Charles Eric Leiserson
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Book
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1 edition published in 1989 in English and held by 7 WorldCat member libraries worldwide
A timing analysis of levelclocked circuitry
by A. T Ishii
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Book
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4 editions published between 1990 and 1992 in English and held by 6 WorldCat member libraries worldwide This paper presents an algorithm for verifying proper timing in VLSI circuits where latches are controlled by the levels (high or low) of the controlling clocks rather than the transitions (edges) of the clocks. Such levelclocked circuits are frequently used in MOS VLSI design. A levelclocked circuit is modeled as a graph G = (V, E), where V consists of componentslatches and functional elementsand E represents intercomponent connections. The algorithm verifies the proper timing of a circuit in worstcase O(V/E) time and O(V + E) space. Our analysis decouples the problem of generating timing constraints from the problem of efficiently checking them. We show how various base step functions can be used to provide sufficient conditions for a circuit to operate properly, and we provide a new base step function which is less pessimistic than those used in previous timing verifiers, yet correctly handles timing constraints that are cyclic or extend across the boundaries of multiple clock phases or cycles. The base step function is used to derive a computational expansion of the circuit from which a collection of simple linear constraints are derived. These constraints can be efficiently checked using standard graph algorithms. VLSI systems, Levelclocking, Timing constraints, Timing analysis, Timing verification, Computational expansions, Deltaconstraints, Formal modeling, Graph algorithm applications, Algorithmic techniques
Systolic priority queues
by Charles Eric Leiserson
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Book
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1 edition published in 1979 in English and held by 6 WorldCat member libraries worldwide
8th Annual ACM symposium on parallel algorithms and architectures
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Book
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1 edition published in 1996 in English and held by 6 WorldCat member libraries worldwide
Areaefficient graph layouts (for VLSI)
by Charles Eric Leiserson
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Book
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1 edition published in 1980 in English and held by 6 WorldCat member libraries worldwide
Systolic Arrays for (VLSI)
by H. T Kung
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Book
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4 editions published between 1978 and 1979 in English and Undetermined and held by 6 WorldCat member libraries worldwide A systolic system is a network of processors which rhythmically compute and pass data through the system. Physiologists use the work 'systole' to refer to the rhythmically recurrent contraction of the heart and arteries which pulses blood through the body. In a systolic computing system, the function of a processor is analogous to that of the heart. Every processor regularly pumps data in and out, each time performing some short computation, so that a regular flow of data is kept up in the network. Many basic matrix computations can be pipelined elegantly and efficiently on systolic networks having an array structure. As an example, hexagonally connected processors can optimally perform matrix multiplication. Surprisingly, a similar systolic array can compute the LUdecomposition of a matrix. These systolic arrays enjoy simple and regular communication paths, and almost all processors used in the networks are identical. As a result, special purpose hardware devices based on systolic arrays can be built inexpensively using the VLSI technology. (Author) more
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Associated Subjects
Algorithms Combinatorial optimization Computer algorithms Computer architecture Computer programming Data structures (Computer science) Electronic circuits Electronic digital computersCircuits Graph theory Graph theoryData processing Integrated circuits Integrated circuitsDesign and construction Integrated circuitsLarge scale integration Integrated circuitsVery large scale integration Linear programmingData processing MicrocomputersBuses Multiprocessors Parallel processing (Electronic computers) Permutations Queuing theory Rectangles Supercomputers Synchronization Systolic array circuits Trees (Graph theory)Data processing

Alternative Names
Leiserson, Charles E.
Лейзерсон, Ч.
ライザーソン, C.
ライザーソン, C. E.
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