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15 results on '"D. Stassinopoulos"'

1. Multimodality Stereotactic Brain Tissue Identification: The NASA Smart Probe Project

Author

Robert W. Mah, A. Galvagni, C. Reed, Russell J. Andrews, D. Stassinopoulos, M. Guerrero, K. Freitas, R. Papsin, and A. Aghevli

Subjects
Diagnostic Imaging, Male, medicine.medical_specialty, medicine.diagnostic_test, business.industry, Dissection, Brain biopsy, Brain tumor, Brain, food and beverages, Brain tissue, Middle Aged, Functional neurosurgery, medicine.disease, User-Computer Interface, medicine, Medical imaging, Humans, Surgery, Medical physics, Neurology (clinical), Radiology, business, Software
Abstract

Real-time tissue identification can benefit procedures such as stereotactic brain biopsy, functional neurosurgery and brain tumor excision. Optical scattering spectroscopy has been shown to be effective at discriminating cancer from noncancerous conditions in the colon, bladder and breast. The NASA Smart Probe extends the concept of ‘optical biopsy’ by using neural network techniques to combine the output from 3 microsensors contained within a cannula 2.7 mm in diameter (i.e. the diameter of a stereotactic brain biopsy needle). Experimental data from 5 rats show the clear differentiation between tissues such as brain, nerve, fat, artery and muscle that can be achieved with optical scattering spectroscopy alone. These data and previous findings with other modalities such as (1) analysis of the image from a fiberoptic neuroendoscope and (2) the output from a microstrain gauge suggest the Smart Probe multiple microsensor technique shows promise for real-time tissue identification in neurosurgical procedures.

Published
1999
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2. Self-organization, scaling, and parallelism

Author

D. Stassinopoulos

Subjects
Self-organization, Artificial neural network, Computer science, business.industry, Association (object-oriented programming), Competitive learning, Parallelism (grammar), Context (language use), Artificial intelligence, business, Scaling, Simple (philosophy)
Abstract

The problem of learning in the absence of external intelligence is discussed in the context of a simple model. The model departs from the traditional gradient-descent based approaches to learning by operating at a highly susceptible "critical" state, with low activity and sparse connections between firing neurons. Quantitative studies in the context of two simple association tasks demonstrate that the elements of the model that are essential for self-organized learning are also essential for its scaling performance and parallelism.

Published
2002
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3. An Ultra-Precise Storage Ring for the Muon g — 2 Measurement

Author

B. L. Roberts, D. Loomba, K. Woodle, D.H Brown, H. Venkataramania, A. Yamamoto, B. Kerosky, M. May, B. DeVito, Satish Dhawan, H. Hirabayashi, J. T. Reidy, V. W. Hughes, I. Polk, F. Krienen, A. Soukas, K. Becker, Ya. M. Shatunov, T. Sato, W. Lysenko, G. T. Danby, A. Pendzick, H. Mundinger, P. Cushman, M. S. Lubell, L. R. Sulak, J. Bailey, C. Heisey, D. Magaud, E. Hazen, F. J. M. Farley, A. Prodell, T. DeWinter, L. M. Barkov, C. Pai, G. zu Putlitz, B. Chertok, W. A. Worstell, Toichiro Kinoshita, Yuri F. Orlov, E. A. Kuraev, H. N. Brown, S. Kurokawa, A. Disco, D. Stassinopoulos, J. W. Jackson, E. Mclntyre, L. Posnlck, Louis Snydstrup, G. Cottingham, B. I. Khazin, G. Bunce, Klaus-Peter Jungmann, V. Meng, J. Cullen, D. Winn, K. Nishiyama, H. E. Ahn, K. Endo, K. Ishida, R. P. Shutt, J. Mills, K. Nagamine, and J. P. Miller

Subjects
Physics, Nuclear physics, Pole piece, Electromagnet, Anomalous magnetic dipole moment, law, Magnet, Vacuum chamber, Superconducting magnet, Storage ring, law.invention, Magnetic field
Abstract

An ultra precise 3 GeV/c storage ring with a 14.5 kG super-ferric magnet is under construction at the Brookhaven AGS for the measurement of the muon anomalous magnetic moment to 0.35 PPM accuracy. This requires a magnetic field which is constant to ≈ 1 PPM and is known sufficiently well that the magnetic field integral averaged over the muon orbits can be calculated to 0.1 PPM. First the magnetic field will be statically shimmed by various techniques. Pole face winding will be used for final small static and dynamic corrections. Very elaborate NMR field monitoring techniques are required. A “movable trolley” located inside the vacuum chamber and the electrostatic focusing quadrupoles will measure the field throughout the muon storage volume. The trolley “siding” is 180˚ from the injection point where no electric quadrupoles are located. Injection can be interrupted so the trolley can circle the ring. Also ≈ 200 NMR probes located outside the vacuum chamber monitor the field during physics running and control the pole face windings. The very large (≈ 15 m diameter) superconducting coils (SC) are designed. Test winding will soon commence. Orders for the magnet steel can now be placed. R and D on various pulsed and SC dc injection methods is ongoing.

Published
1990
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4. Contents Vol. 73, 1999

Author

Wendy Fellows, L. Shuer, Satoshi Maesawa, Patrick Johnson, Michael L.J. Apuzzo, D.W. Loring, S. Lee, John Olin, Don R. Goffinet, C. Nuti, G.P. Lee, Andrei I. Holodny, Dan Y. Song, Mark Tulley, P. Mertens, K.J. Meador, M. Funke, Timothy D. Solberg, Dennis Way, Valerie C. Anderson, Vijay M. Thadani, Adrian M. Siegel, Fabrice Parker, Michael T. Selch, Douglas Kondziolka, John D. McKean, Malt Wheatley, Y.D. Park, Christopher M. DeGiorgio, P. Krolak-Salmon, N.T. Zervas, A. Galvagni, B. Laurent, Rees Cosgrove, B. Chong, David W. Roberts, Richard Essner, Mitshuhiro Hara, Alton L. Lightsey, Baldassarre Stea, Milind Deogaonkar, K. Freitas, K. Roberts, David H. Kidd, Mitsunobu Ide, C.S. Kang, David J. Tate, Wen-Ching Liu, John R. Adler, Haiying Liu, Peter D. Williamson, C. Reed, R. Peyron, Joseph C.T. Chen, D.W. King, Peter W. Carmel, Jean Martin, Keith Matthews, J. Abdullah, P. Ryvlin, Alastair J. Martin, D.W. Roberts, Todd P. Thompson, P.D. Jenkins, J. Lewine, J. Isnard, J.R. Smith, David P. Martin, Toshisuke Sakaki, P. Biggs, Allison Gray, R. Andrews, Mark Lee, M.R. Lee, Barbara C. Jobst, Allan J. Hamilton, L.A. Platenik, D. Stassinopoulos, Istvan Takacs, Walter A. Hall, P. MacDonald, A. de Lotbinière, Michael Schulder, R.E. Gross, A. Aghevli, Kris Smith, Cheng Yu, Yong D. Park, A. Hartov, Patrick P. Han, Andrew Kalnin, F.E. Kennedy, Alan Forster, Ajay Jawahar, Jeffrey M. Sieracki, D. Nijensohn, Joseph R. Smith, L.G. Zheng, Steven D. Chang, G. Karmos, Richard B. North, Alexander Jacobs, Donald L. Morton, Anantha Kishan, Shiro Chitoku, David John Yeh, K.D. Paulsen, A.M. Murro, Masaaki Yamamoto, A. Vighetto, H. Pallatroni, Antonio A.F. De Salles, Steven J. O'Day, L. Dade Lunsford, Michel F. Lévesque, Jeffrey A. Fiedler, Jeffery A. Williams, James McInerney, W. Brent Tarver, Konstantin V. Slavin, R. Mah, Christopher Davis, J. Loeffler, Steven L. Giannotta, Helen Fosmire, Tohru Hoshida, Kim J. Burchiel, L. Garcia-Larrea, Steven Sapareto, M.P. Sindou, M.N. Isa, Andrew G. Shetter, Peter Heilbrun, J. Beatty, Jeffery Balzer, Burton Speiser, Arun P. Amar, Zbigniew Petrovich, John C. Flickinger, E. Halgren, Aron Cohen-Gadol, C. Fischer, Charles L. Truwit, Gudrun Lange, Bruce Lulu, Fardad Mobin, Edward Dixon, Dana MacPherson, I. Ulbert, Venkat Narra, M. Sam Eljamel, Gary Heit, C. Leland Rogers, Beverly Cooke, M. Guenot, Hidehiro Hirabayashi, Osama S. Abdelaziz, Jose L. Vega, Iman Feiz-Erfan, M.I. Miga, J. McInerney, Cynthia Cabatan-Awang, I. Spiro, J. Knisely, R. Papsin, F. Mauguière, D.S. Xu, A. Dean, G. Jones, Minoru imbo, John Ogden, Richard E. Nordgren, M. Sindou, Isamu Saito, Alexander G. Reeves, and M. Guerrero

Subjects
medicine.medical_specialty, Philosophy, medicine, Library science, Surgery, Medical physics, Neurology (clinical)
Published
1999
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5. Subject Index Vol. 73, 1999

Author

Malt Wheatley, P. Krolak-Salmon, N.T. Zervas, A. Galvagni, David J. Tate, Satoshi Maesawa, Baldassarre Stea, D. Stassinopoulos, C. Nuti, Michael Schulder, Patrick P. Han, Ajay Jawahar, D.S. Xu, Osama S. Abdelaziz, Don R. Goffinet, A. Dean, Joseph R. Smith, M. Funke, David W. Roberts, K.D. Paulsen, R. Mah, John Olin, Steven D. Chang, G. Karmos, Michael T. Selch, G. Jones, Minoru imbo, Alastair J. Martin, J. Isnard, A. Vighetto, Shiro Chitoku, Mark Lee, Wendy Fellows, L. Shuer, W. Brent Tarver, Michel F. Lévesque, Konstantin V. Slavin, Walter A. Hall, A. Hartov, K. Roberts, Jeffery A. Williams, Patrick Johnson, Timothy D. Solberg, Michael L.J. Apuzzo, Jose L. Vega, Richard Essner, Venkat Narra, John R. Adler, P. Ryvlin, J. Loeffler, Andrei I. Holodny, Tohru Hoshida, Adrian M. Siegel, M.N. Isa, C.S. Kang, Yong D. Park, R. Andrews, P.D. Jenkins, Peter W. Carmel, L.A. Platenik, Douglas Kondziolka, M. Sam Eljamel, Gary Heit, Milind Deogaonkar, K. Freitas, R. Peyron, Keith Matthews, J. Abdullah, B. Laurent, B. Chong, Kim J. Burchiel, Allison Gray, Mitsunobu Ide, Dennis Way, Valerie C. Anderson, Joseph C.T. Chen, Rees Cosgrove, J. McInerney, D.W. Roberts, Andrew Kalnin, Hidehiro Hirabayashi, Wen-Ching Liu, Peter Heilbrun, Alton L. Lightsey, Andrew G. Shetter, I. Spiro, Jeffery Balzer, Barbara C. Jobst, Peter D. Williamson, D. Nijensohn, J. Lewine, John D. McKean, Cynthia Cabatan-Awang, Donald L. Morton, Allan J. Hamilton, Arun P. Amar, J. Knisely, C. Reed, R. Papsin, R.E. Gross, C. Leland Rogers, Dana MacPherson, Richard B. North, I. Ulbert, F. Mauguière, Cheng Yu, Fabrice Parker, Alan Forster, D.W. Loring, Zbigniew Petrovich, Steven L. Giannotta, Jean Martin, S. Lee, Vijay M. Thadani, P. MacDonald, A. de Lotbinière, A.M. Murro, G.P. Lee, Haiying Liu, Edward Dixon, L. Garcia-Larrea, C. Fischer, Charles L. Truwit, Mark Tulley, P. Mertens, K.J. Meador, H. Pallatroni, Gudrun Lange, Antonio A.F. De Salles, Steven Sapareto, M.P. Sindou, Toshisuke Sakaki, Jeffrey M. Sieracki, Aron Cohen-Gadol, Dan Y. Song, Todd P. Thompson, P. Biggs, Anantha Kishan, John C. Flickinger, E. Halgren, A. Aghevli, L.G. Zheng, Alexander Jacobs, Steven J. O'Day, L. Dade Lunsford, Istvan Takacs, M.R. Lee, Bruce Lulu, Fardad Mobin, David John Yeh, Kris A. Smith, Mitshuhiro Hara, Y.D. Park, Christopher M. DeGiorgio, David H. Kidd, Beverly Cooke, M. Guenot, Jeffrey A. Fiedler, M.I. Miga, J. Beatty, D.W. King, F.E. Kennedy, J.R. Smith, David P. Martin, James McInerney, Christopher Davis, Helen Fosmire, Masaaki Yamamoto, Burton Speiser, Iman Feiz-Erfan, M. Guerrero, John Ogden, Richard E. Nordgren, M. Sindou, Isamu Saito, and Alexander G. Reeves

Subjects
medicine.medical_specialty, Index (economics), business.industry, medicine, Surgery, Medical physics, Subject (documents), Neurology (clinical), business
Published
1999
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6. Asymptotic form of the spectral dimension at the fractal to lattice crossover

Author

H E Stanley, S Milosevic, and D Stassinopoulos

Subjects
Combinatorics, Fractal, Asymptotic form, Lattice (order), Spectral dimension, Crossover, Euclidean geometry, General Physics and Astronomy, Statistical and Nonlinear Physics, Mathematical Physics, Sierpinski triangle, Mathematics, Mathematical physics
Abstract

The authors study the spectral dimension of the Sierpinski gasket family of fractals. Each member of the family is labelled by an integer b(2

Published
1988
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7. Ultraprecise superferric storage ring magnet for the Muon G-2 experiment

Author

K. Endo, S. Kurokawa, S. Kuznetsov, J.M. Tarrh, P.G. Marston, G. T. Danby, J. R. Cullen, M. May, G. Cottingham, E. Kelly, R. P. Shutt, G. Vogel, D. H. Brown, F.J.M. Farley, D. Loomba, T. de Winter, F. Krienen, J.M. Bailey, J. Jackson, I. Polk, W. Stokes, H. Hirabayashi, K. Nagamine, A. Disco, S. Dhawan, A. Prodell, Y. Kuang, V.W. Hughes, D. Stassinopoulos, and Y. Yamamoto

Subjects
Nuclear physics, Physics, Muon, Anomalous magnetic dipole moment, Magnetic energy, Electromagnetic coil, Magnet, Superconducting magnet, Superconducting magnetic energy storage, Electrical and Electronic Engineering, Storage ring, Electronic, Optical and Magnetic Materials
Abstract

A new measurement of the anomalous magnetic moment (G-2 factor) of the muon to a precision of 0.35 p.p.m. is being undertaken with the AGS at Brookhaven National Laboratory. It will involve a precision superferric storage ring with a magnetic field of 1.5 T and a radius of 7 m for 3.1 GeV/c muons. The magnetic field in the storage region must be homogeneous to one part in 10/sup 6/ and the effective field averaged around the ring must be known to 1 part in 10/sup 7/. The design status of the superferric storage ring and of the techniques planned for magnetic-field control and measurement are presented. Perturbation field calculations for the iron and coil configuration, considerations on the superconducting coil, shimming and measurement techniques, and plans for a test magnet program are discussed. >

Published
1988
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8. Multimodality stereotactic brain tissue identification: the NASA smart probe project.

Author

Andrews R, Mah R, Aghevli A, Freitas K, Galvagni A, Guerrero M, Papsin R, Reed C, and Stassinopoulos D

Subjects
Humans, Male, Middle Aged, Brain anatomy & histology, Diagnostic Imaging, Dissection, Software, User-Computer Interface
Abstract

Real-time tissue identification can benefit procedures such as stereotactic brain biopsy, functional neurosurgery and brain tumor excision. Optical scattering spectroscopy has been shown to be effective at discriminating cancer from noncancerous conditions in the colon, bladder and breast. The NASA Smart Probe extends the concept of 'optical biopsy' by using neural network techniques to combine the output from 3 microsensors contained within a cannula 2. 7 mm in diameter (i.e. the diameter of a stereotactic brain biopsy needle). Experimental data from 5 rats show the clear differentiation between tissues such as brain, nerve, fat, artery and muscle that can be achieved with optical scattering spectroscopy alone. These data and previous findings with other modalities such as (1) analysis of the image from a fiberoptic neuroendoscope and (2) the output from a microstrain gauge suggest the Smart Probe multiple microsensor technique shows promise for real-time tissue identification in neurosurgical procedures., (Copyright 2000 S. Karger AG, Basel)

Published
1999
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12. Space-time renormalization at the onset of spatio-temporal chaos in coupled maps.

Author

Alstrom P and Stassinopoulos D

Abstract

The transition regime to spatio-temporal chaos via the quasiperiodic route as well as the period-doubling route is examined for coupled-map lattices. Space-time renormalization-group analysis is carried out and the scaling exponents for the coherence length, the Lyapunov exponent, and the size of the phase fluctuations are determined. Universality classes for the different types of coupling at various routes to chaos are identified.

Published
1992
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