Worcester Polytechnic Institute

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

Accelerating Fully Homomorphic Encryption in Hardware

Abstract: We present a custom architecture for realizing the Gentry-Halevi fully homomorphic encryption (FHE) scheme. This contribution presents the first full realization of FHE in hardware. The architecture features an optimized multi-million bit multiplier based on the Schonhage Strassen multiplication algorithm. Moreover, a number of optimizations including spectral techniques as well as a precomputation strategy is used to significantly improve the performance of the overall design. When synthesized using 90 nm technology, the presented architecture achieves to realize the encryption, decryption, and recryption operations in 18.1 msec, 16.1 msec, and 3.1 sec, respectively, and occupies a footprint of less than 30 million gates.

Synthesis of Zeolitic Mesoporous Materials by Dry Gel Conversion under Controlled Humidity

Abstract: A new variation to the dry gel conversion method for the preparation of zeolite is introduced, where the conversion to zeolite was accomplished under water vapor below the saturation condition. The dry gel was made either by vacuum concentration or by surfactant flocculation from a silica precursor sol after the preliminary hydrothermal step. Depending of the humidity under which the conversion took place, mesoporous structures with varying MFI crystallinity, BET, and crystalline external surface areas were produced. The effects of precursor preparation and surfactant flocculation conditions on mesoporosity and crystallinity of the final product, as well as the steam stability of the product, were also investigated. The approach could find general application in the synthesis of other zeolites as well as metal oxides.

The cognitive psychology of systems thinking

Abstract: This article describes how established research methods in cognitive psychology can be applied to answer questions about the ability of systems thinking interventions to improve the nature and quality of thought about complex systems. The need for and advantages of controlled experimental research on the effects of interventions on mental models and cognitive processes, as well as the limitations of current assessment practices, are discussed. An agenda for collaborative research between cognitive psychologists and researchers interested in dynamic systems, covering the areas of memory, analogical transfer, mental models, decision processes, human–computer interaction, and expertise, is outlined in detail. The article concludes with a discussion of the difficulties and long-term advantages of conducting the described research. © 1997 John Wiley & Sons, Ltd.

Formation of Silicalite-1 Hollow Spheres by the Self-assembly of Nanocrystals

Abstract: A simple approach is reported for the preparation of hollow spheres with a 10−20-nm-thick shell of silicalite-1 nanocrystals. The nanocrystals were produced by the steaming of silicalite-1 nanoprecursors (NPs), collected with the help of surfactant from a clear synthesis solution immediately following the induction period. The nanocrystals produced were ≈10−20 nm with a BET surface area of 440−470 m2/g and an external surface area >112 m2/g. A water adsorption isotherm confirmed that the nanocrystals were hydrophobic in nature. These nanocrystals self-assembled into hollow spheres of 100−300-nm diameter when ultrasonicated in ammoniac ethanol.