Tech Briefs

Application of the Hilbert-Huang Transform to Financial Data

A paper discusses the application of the Hilbert-Huang transform (HHT) method to time-series financial-market data. The method was described, variously without and with the HHT name, in several prior NASA Tech Briefs articles and supporting documents.

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Scheme for Entering Binary Data Into a Quantum Computer

This could be an important step toward making quantum computing practical.

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Encryption for Remote Control via Internet or Intranet

This protocol provides security against control by unauthorized users.

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Fuzzy Logic Engine

The Fuzzy Logic Engine is a software package that enables users to embed fuzzy-logic modules into their application programs.

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Telephone-Directory Program

eDirectory is a computer program that makes it possible to view entries in the Jet Propulsion Laboratory (JPL) telephone directory by use of PalmPilot ™ (or equivalent) personal digital assistants.

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Calculation Management Captures and Tracks Engineering Design Information

A systematic software approach enables designers to manage engineering methods and values.

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Fast Algorithms for Model-Based Diagnosis

Methods based on Boolean functions and linear programming are more practical for complex systems. Two improved new methods for automated diagnosis of complex engineering systems involve the use of novel algorithms that are more efficient than prior algorithms used for the same purpose. Both the recently developed algorithms and the prior algorithms in question are instances of model-based diagnosis, which is based on exploring the logical inconsistency between an observation and a description of a system to be diagnosed.

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