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Micromachining of a Mesoscale Vibratory Gyroscope

High-performance miniature gyroscopes would be fabricated by established micromachining techniques. A micromachining-based fabrication process has been proposed for low-volume production of copies of a mesoscale vibratory gyroscope. The process would include steps of photolithography, metallization, deep reactive-ion etching (RIE), Au/Au thermal-compression bonding, and anodic bonding. In the present state of the art, these process steps are well established and the process as a whole would be considered reproducible.

Posted in: Manufacturing & Prototyping, Briefs, TSP

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Software Optimizes Piping System for Sewage Treatment Plant

A $90 million AUS (Australian dollar) upgrade ($49 million USD) to the Cronulla Sewage Treatment Plant in Southern Sydney, Australia, was undertaken to meet the requirements of a growing population and to add advanced sewage treatment processes including ultraviolet disinfection. During the design phase, a cost-effective engineering solution needed to be developed for a new aeration system that provides air to the biological reactors. Design, Detail and Development, a division of Blenray Pty. Ltd., used ALGOR's piping design and analysis software, PipePak, to analyze modifications to the aeration system to ensure that the new design could withstand expected thermal strains. The initial design contained numerous, expensive stainless steel bellows to account for thermal expansion and contraction. The final design of the system replaced bellows with spiral-wound stainless steel, which saved $150,000 AUS ($81,800 USD) and helped to keep the project on budget. The system has been installed and is functioning successfully.

Posted in: Software, Briefs

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Quantum Search in Hilbert Space

A large database would be searched in one quantum computing operation. A proposed quantum-computing algorithm would perform a search for an item of information in a database stored in a Hilbert-space memory structure. The algorithm is intended to make it possible to search relatively quickly through a large database under conditions in which available computing resources would otherwise be considered inadequate to perform such a task.

Posted in: Information Sciences, Briefs, TSP

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Wavelet-Based Real-Time Diagnosis of Complex Systems

Changes in hardware and software can be simultaneously examined for signs of loss of control. A new method of robust, autonomous real-time diagnosis of a time-varying complex system (e.g., a spacecraft, an advanced aircraft, or a process-control system) is presented here. It is based upon the characterization and comparison of (1) the execution of software, as reported by discrete data, and (2) data from sensors that monitor the physical state of the system, such as performance sensors or similar quantitative time-varying measurements. By taking account of the relationship between execution of, and the responses to, software commands, this method satisfies a key requirement for robust autonomous diagnosis, namely, ensuring that control is maintained and followed.

Posted in: Information Sciences, Briefs, TSP

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Runge-Kutta Circular-Advection-Problem Solver

Release 3.0 of the Multi-Stage Runge-Kutta Circular Advection Solver is a computer program that solves the circular-advection problem by use of a general m-stage Runge-Kutta scheme (for m = 1, 2, and 4) on a Cartesian (x,y) grid with optimized coefficients. [The circular-advection problem, ¶u/¶t = (-y,x) × grad(u) is a classical model of convective phenomena suitable for studying the behaviors of algorithms.] The spatial discretization in this software is that of a cell-centered upwind finite-volume formulation. The software is presented as an extensible object-oriented class library arranged so that the components of the Runge-Kutta algorithm can be instantiated arbitrarily from within another computer program. The software includes a complete library wrapper that enables launching of the rest of the software from a command line by use of consistent UNIX-style filter conventions. The source code was developed by use of the Extreme Programming (also known, variously, as "eXtreme Programming" and "XP") methodology, and as such is self-revealing, modular, compact, extendable, and customizable. A unique feature of this program is a provision for comprehensive automated testing. All library classes are bundled with complete verification tests, both documenting the feature behavior and enabling extension by end users. Developers have instant feedback from the automated tests if their extensions conflict with the existing code base. Further, a full set of automated validation tests is included to prove various numerical definitions such as positivity or order property of the solver.

Posted in: Software, Briefs

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Software for Mobile Data-Communication Networks

Mobile Router is operating system code residing in a network router allowing the router to provide mobile-ipv4 functionality for any attached nodes. Mobile Router enables the entire network to roam. It is no longer necessary for every node in the network to run mobile Internet Protocol (IP) software because Mobile Router provides this function. In addition, Mobile Router eliminates the need to reconfigure a router as it moves from one network to another network, even across network domains. For example, Mobile Router enables communication with aircraft via the lnternet and/or intranets. Information as weather data, air-traffic control messages, voice communications, and images could be transmitted to aircraft easily and inexpensively by use of Internet protocols. As another example, data-communication nodes running Mobile Router could be incorporated into ambulances to provide real-time data communications with hospitals and medical experts. Commercial applications could include the provision of mobile Internet connections for cargo and cruise ships, tour buses, passenger aircraft, and automobiles.

Posted in: Software, Briefs, TSP

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Software for Onboard Autonomy of a Three-Spacecraft Mission

A system of software has been designed to enable autonomous operations of the three University-built miniature spacecraft of the Three Corner Sat mission, scheduled for launch in 2003. The main software subsystems and their functions are the following:

Posted in: Software, Briefs, TSP

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