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Institution

Worcester Polytechnic Institute

EducationWorcester, Massachusetts, United States
About: Worcester Polytechnic Institute is a education organization based out in Worcester, Massachusetts, United States. It is known for research contribution in the topics: Population & Data envelopment analysis. The organization has 6270 authors who have published 12704 publications receiving 332081 citations. The organization is also known as: WPI.


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Proceedings ArticleDOI
14 Apr 1999
TL;DR: This contribution proposes arithmetic architectures which are optimized for modern field programmable gate arrays (FPGAs) and shows that it is possible to implement modular exponentiation at secure bit lengths on a single commercially available FPGA.
Abstract: It is widely recognized that security issues will play a crucial role in the majority of future computer and communication systems. Central tools for achieving system security are cryptographic algorithms. For performance as well as for physical security reasons, it is often advantageous to realize cryptographic algorithms in hardware. In order to overcome the well-known drawback of reduced flexibility that is associated with traditional ASIC solutions, this contribution proposes arithmetic architectures which are optimized for modern field programmable gate arrays (FPGAs). The proposed architectures perform modular exponentiation with very long integers. This operation is at the heart of many practical public-key algorithms such as RSA and discrete logarithm schemes. We combine the Montgomery modular multiplication algorithm with a new systolic array design, which is capable of processing a variable number of bits per array cell. The designs are flexible, allowing any choice of operand and modulus. Unlike previous approaches, we systematically implement and compare several variants of our new architecture for different bit lengths. We provide absolute area and timing measures for each architecture. The results allow conclusions about the feasibility and time-space trade-offs of our architecture for implementation on Xilinx XC4000 series FPGAs. As a major practical result we show that it is possible to implement modular exponentiation at secure bit lengths on a single commercially available FPGA.

192 citations

Journal ArticleDOI
20 Jun 2016-JOM
TL;DR: In this paper, a new technology has been developed by the researchers at Worcester Polytechnic Institute which is capable of recovering LiNi and O2 cathode material from a hydrometallurgical process, making the recycling system as a whole more economically viable.
Abstract: The lithium ion (Li-ion) battery industry has been growing exponentially since its initial inception in the late 20th century. As battery materials evolve, the applications for Li-ion batteries have become even more diverse. To date, the main source of Li-ion battery use varies from consumer portable electronics to electric/hybrid electric vehicles. However, even with the continued rise of Li-ion battery development and commercialization, the recycling industry is lagging; approximately 95% of Li-ion batteries are landfilled instead of recycled upon reaching end of life. Industrialized recycling processes are limited and only capable of recovering secondary raw materials, not suitable for direct reuse in new batteries. Most technologies are also reliant on high concentrations of cobalt to be profitable, and intense battery sortation is necessary prior to processing. For this reason, it is critical that a new recycling process be commercialized that is capable of recovering more valuable materials at a higher efficiency. A new technology has been developed by the researchers at Worcester Polytechnic Institute which is capable of recovering LiNi x Mn y Co z O2 cathode material from a hydrometallurgical process, making the recycling system as a whole more economically viable. By implementing a flexible recycling system that is closed-loop, recycling of Li-ion batteries will become more prevalent saving millions of pounds of batteries from entering the waste stream each year.

190 citations

Journal ArticleDOI
TL;DR: In this article, the full Navier-Stokes equations are solved by a parallelized finite-difference/front-tracking method that allows a deformable interface between the bubbles and the suspending fluid and the inclusion of surface tension.
Abstract: Direct numerical simulations of the motion of 27 three-dimensional deformable buoyant bubbles in periodic domains are presented The full Navier–Stokes equations are solved by a parallelized finite-difference/front-tracking method that allows a deformable interface between the bubbles and the suspending fluid and the inclusion of surface tension The Eotvos number is taken as equal to 5, so that the bubbles are ellipsoidal, and the Galileo number is 900, so that the rise Reynolds number of a single bubble in an unbounded flow is about 26 Three values of the void fraction have been investigated: 2%, 6% and 12% At 6%, a change in the behaviour of the bubbles is observed The bubbles are initially dispersed homogeneously throughout the flow field and their average rise Reynolds number is 23 After the bubbles have risen by about 90 bubble diameters, they form a vertical stream and accelerate The microstructure of the bubble suspension is analysed and an explanation is proposed for the formation of these streams The results for the ellipsoidal bubbles are compared to the results for nearly spherical bubbles, for which the Eotvos number is 1 and the Galileo number is 900 The dispersion of the bubbles and the velocity fluctuations in the liquid phase are analysed

190 citations

Journal ArticleDOI
TL;DR: It is shown that it is possible to uncover representations of sensory input and motor output in individual neurons of behaving animals from brainwide dynamics and an imaging setup and analysis pipeline should facilitate mapping circuits for sensory to motor transformation in transparent behaving animals such as C. elegans and Drosophila larva.
Abstract: We present an imaging system for pan-neuronal recording in crawling Caenorhabditis elegans. A spinning disk confocal microscope, modified for automated tracking of the C. elegans head ganglia, simultaneously records the activity and position of ∼80 neurons that coexpress cytoplasmic calcium indicator GCaMP6s and nuclear localized red fluorescent protein at 10 volumes per second. We developed a behavioral analysis algorithm that maps the movements of the head ganglia to the animal's posture and locomotion. Image registration and analysis software automatically assigns an index to each nucleus and calculates the corresponding calcium signal. Neurons with highly stereotyped positions can be associated with unique indexes and subsequently identified using an atlas of the worm nervous system. To test our system, we analyzed the brainwide activity patterns of moving worms subjected to thermosensory inputs. We demonstrate that our setup is able to uncover representations of sensory input and motor output of individual neurons from brainwide dynamics. Our imaging setup and analysis pipeline should facilitate mapping circuits for sensory to motor transformation in transparent behaving animals such as C. elegans and Drosophila larva.

190 citations

Journal ArticleDOI
TL;DR: Several books examining family business published in the past 25 years may legitimately be labeled seminal as mentioned in this paper, including Keeping the Family Business Healthy: How to Plan for Continuing Growth, Profitability, and Family Leadership.
Abstract: Several books examining family business published in the past 25 years may legitimately be labeled seminal. Some of our earliest exposures were through autobiographies and biographies of well-known families: the Rothschilds, DuPonts, Fords, and others. Consultants such as Léon Danco, Gerald Le Van, and David Bork wrote books describing their observations and recommendations, giving readers perspectives on the relationships between families and their enterprises. In 1987, John Ward was among the first to produce a guide for family firms that was derived from a research base. Keeping the Family Business Healthy: How to Plan for Continuing Growth, Profitability, and Family Leadership proved to be influential to both practitioners and scholars, being reissued and updated. As we track the evolution of the field, other authors have also been influential. Generation to Generation: Life Cycles of the Family Business by Kelin Gersick, John Davis, Marion McCollom Hampton, and Ivan Lansberg is one of the most important contributions from the 1990s, and Managing for the Long Run: Lessons in Competitive Advantage From Great Family Businesses by Danny Miller and Isabelle Le Breton-Miller helped direct researchers in new ways as we entered the 21st century. Each of these three books has been reviewed previously in Family Business Review (Aronoff, 1996; Guzzo, 1988; Sharma, 2005). In this anniversary issue, we take another look at these bodies of work and the roles they have played in advancing knowledge, including reflections by the authors. Ward and the 1980s

190 citations


Authors

Showing all 6336 results

NameH-indexPapersCitations
Andrew G. Clark140823123333
Ming Li103166962672
Joseph Sarkis10148245116
Arthur C. Graesser9561438549
Kevin J. Harrington8568233625
Kui Ren8350132490
Bart Preneel8284425572
Ming-Hui Chen8252529184
Yuguang Fang7957220715
Wenjing Lou7731129405
Bernard Lown7333020320
Joe Zhu7223119017
Y.S. Lin7130416100
Kevin Talbot7126815669
Christof Paar6939921790
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
202326
202295
2021762
2020836
2019761
2018703