Principal Developments in the Adaptive Control of Machine Tools

Although adaptive control (AC) systems for machine tools have a tremendous potential for improving productivity in manufacturing, their acceptance by industry has been slow. This paper identifies the major research and development areas for AC machine tools, and summarizes the principal developments of the last two decades. Current research at The University of Michigan, which is aimed at the development of stable yet high performance AC systems for turning and milling, is also described.

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An Overview of Autonomous Underwater Vehicle Research and Testbed at PeRL

Marine Technology Society Journal ◽

10.4031/mtsj.43.2.4 ◽

2009 ◽

Vol 43 (2) ◽

pp. 33-47 ◽

Cited By ~ 14

Author(s):

Hunter C. Brown ◽

Ayoung Kim ◽

Ryan M. Eustice

Keyword(s):

Real Time ◽

Autonomous Underwater Vehicle ◽

Underwater Vehicle ◽

University Of Michigan ◽

Major Research ◽

Research Areas ◽

Localization And Mapping ◽

Navigation And Control ◽

The University ◽

And Control

AbstractThis article provides a general overview of the autonomous underwater vehicle (AUV) research thrusts being pursued within the Perceptual Robotics Laboratory (PeRL) at the University of Michigan. Founded in 2007, PeRL's research centers on improving AUV autonomy via algorithmic advancements in environmentally based perceptual feedback for real-time mapping, navigation, and control. Our three major research areas are (1) real-time visual simultaneous localization and mapping (SLAM), (2) cooperative multi-vehicle navigation, and (3) perception-driven control. Pursuant to these research objectives, PeRL has developed a new multi-AUV SLAM testbed based upon a modified Ocean-Server Iver2 AUV platform. PeRL upgraded the vehicles with additional navigation and perceptual sensors for underwater SLAM research. In this article, we detail our testbed development, provide an overview of our major research thrusts, and put into context how our modified AUV testbed enables experimental real-world validation of these algorithms.

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Novae in the Magellanic Clouds

International Astronomical Union Colloquium ◽

10.1017/s0252921100073334 ◽

1979 ◽

Vol 46 ◽

pp. 96-101

Author(s):

J.A. Graham

Keyword(s):

Large Magellanic Cloud ◽

Magellanic Cloud ◽

Magellanic Clouds ◽

University Of Michigan ◽

The Past ◽

Spectroscopic Information ◽

Objective Prism ◽

The University ◽

Small Cloud ◽

Low Dispersion

During the past several years, a systematic search for novae in the Magellanic Clouds has been carried out at Cerro Tololo Inter-American Observatory. The Curtis Schmidt telescope, on loan to CTIO from the University of Michigan is used to obtain plates every two weeks during the observing season. An objective prism is used on the telescope. This provides additional low-dispersion spectroscopic information when a nova is discovered. The plates cover an area of 5°x5°. One plate is sufficient to cover the Small Magellanic Cloud and four are taken of the Large Magellanic Cloud with an overlap so that the central bar is included on each plate. The methods used in the search have been described by Graham and Araya (1971). In the CTIO survey, 8 novae have been discovered in the Large Cloud but none in the Small Cloud. The survey was not carried out in 1974 or 1976. During 1974, one nova was discovered in the Small Cloud by MacConnell and Sanduleak (1974).

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Advances in imaging SIMS studies of stained and BrdU-labelled human metaphase chromosomes

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100141032 ◽

1995 ◽

Vol 53 ◽

pp. 932-933

Author(s):

R. Levi-Setti ◽

J. M. Chabala ◽

R. Espinosa ◽

M. M. Le Beau

Keyword(s):

High Performance ◽

Secondary Ion Mass Spectrometry ◽

Analytical Sensitivity ◽

Metaphase Chromosomes ◽

Banding Patterns ◽

Sector Mass Spectrometer ◽

Staining Methods ◽

The University ◽

Secondary Ion ◽

Better Than

We have shown previously that isotope-labelled nucleotides in human metaphase chromosomes can be detected and mapped by imaging secondary ion mass spectrometry (SIMS), using the University of Chicago high resolution scanning ion microprobe (UC SIM). These early studies, conducted with BrdU- and 14C-thymidine-labelled chromosomes via detection of the Br and 28CN- (14C14N-> labelcarrying signals, provided some evidence for the condensation of the label into banding patterns along the chromatids (SIMS bands) reminiscent of the well known Q- and G-bands obtained by conventional staining methods for optical microscopy. The potential of this technique has been greatly enhanced by the recent upgrade of the UC SIM, now coupled to a high performance magnetic sector mass spectrometer in lieu of the previous RF quadrupole mass filter. The high transmission of the new spectrometer improves the SIMS analytical sensitivity of the microprobe better than a hundredfold, overcoming most of the previous imaging limitations resulting from low count statistics.

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