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Your search keyword '"D. Lieuwen"' showing total 4 results
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4 results on '"D. Lieuwen"'

1. Recovering scalable spin locks

Author

A. Silbershatz, Philip Bohannon, and D. Lieuwen

Subjects
Concurrency control, Record locking, Correctness, Shared memory, Computer science, Distributed computing, Readers–writer lock, Scalability, Mutual exclusion, Data structure, Lock (computer science)
Abstract

We present a mechanism for making a scalable spin lock protocol, the MCS lock recoverable, thereby ensuring that a lock never becomes permanently unavailable, even if one or more processes using the lock die. This is achieved by modifying the original protocol to write additional information to shared memory and introducing a cleanup process which returns locks to a usable state in case of process death(s). Our method does not require kernel or hardware support other than the swap instruction, and maintains performance comparable to the original protocol (one third as fast in the uncontested case). We have proven the correctness of our scheme in the face of the weak memory models provided by modern systems.

Published
2002

2. 1296-port MEMS transparent optical crossconnect with 2.07 petabit/s switch capacity

Author

C. Yoh, H.T. Soh, S. Jin, Hareesh Mavoori, V. Muratov, Ainissa G. Ramirez, Flavio Pardo, C. Lichtenwalner, R. Papazian, William M. Mansfield, J.Q. Liu, R. George, C. A. Bolle, J.M. Rosamilia, D. Lieuwen, Dennis S. Greywall, Gregory R. Bogart, W.Y.C. Lai, J.E. Griffith, A. Weis, David J. Bishop, Herbert Shea, H.A. Huggins, Raymond A. Cirelli, R. Frahm, N.A. Ciampa, Carolyn D. White, Paul Kolodner, Arman Gasparyan, David T. Neilson, Suresh Goyal, C. Nijander, R. Ruel, S. Pau, J.P. Hickey, T. Boone, Susanne Arney, Robert Albert Boie, D.L. Barr, Alan H. Gnauck, M.D. Morris, T. C. Lee, Nagesh R. Basavanhally, R. Vella, Vladimir A. Aksyuk, K. Teffeau, Jungsang Kim, F. Klemens, Carl J. Nuzman, J.A. Prybyla, Roland Ryf, Dustin W. Carr, M.T. Lin, David A. Ramsey, B. Kumar, J. Kraus, Clinton Randy Giles, and John Vanatta Gates

Subjects
Crosstalk, Microelectromechanical systems, Data stream, Optics, Materials science, business.industry, Wavelength-division multiplexing, Insertion loss, business, Optical switch, Deformable mirror, Petabit
Abstract

A 1296-port MEMS transparent optical crossconnect with 5.1dB/spl plusmn/1.1dB insertion loss at 1550 nm is reported. Measured worst-case optical crosstalk in a fabric was n38 dB and nominal switching rise/fall times were 5 ms. A 2.07 petabit/s switch capacity was verified upon cross-connecting a forty-channel by 40 Gb/s DWDM data stream through a prototype fabric.

Published
2002

3. Scalable wavelength-selective crossconnect switch based on MEMS and planar waveguides

Author

C. Bolle, H.A. Huggins, G.R. Bogart, C.D. White, David T. Neilson, W.Y.C. Lai, S. Amey, Herbert Shea, C. Nijander, C.P. Lichtenwalner, Nagesh R. Basavanhally, M.D. Morris, K. Teffeau, T. Boone, Dennis S. Greywall, R. Frahm, J.S. Kraus, C. Yoh, B. Kumar, A. Gasparyan, R. Ruel, Paul Kolodner, H.T. Soh, M.T. Lin, T.C. Lee, R. Ryf, C.R. Giies, Suresh Goyal, N.A. Ciampa, S. Pau, J.Q. Liu, J.E. Griffith, F.P. Klemens, William M. Mansfield, R.A. Cirelli, J.A. Prybyla, D.L. Barr, D. Lieuwen, R. George, P.G. Bernasconi, Jungsang Kim, Carl J. Nuzman, A. Ramirez, R. Papazian, Vladimir A. Aksyuk, R. Vella, David J. Bishop, H. Mavoori, S. Jin, A. Weis, D. Carr, Flavio Pardo, V. Muratov, D.A. Ramsey, J.M. Rosamilia, J.V. Gates, and J.P. Hickey

Subjects
Microelectromechanical systems, Optics, Materials science, Planar, business.industry, Beam steering, Channel spacing, Silicon on insulator, Insertion loss, Optoelectronics, business, Multiplexer, Multiplexing
Abstract

A 72/spl times/72 wavelength-selective crossconnect switch, that is scalable to 1296/spl times/1296 with current technology, is presented. Silica-on-silicon wavelength multiplexers with integrated monitoring taps and a MEMS micromirror array were assembled in a hybrid 3D beam steering crossconnect having 20 dB insertion loss, 100 GHz channel spacing and 30 GHz passbands.

4. Contrasting cytokine profiles in the synovium of different forms of juvenile rheumatoid arthritis and juvenile spondyloarthropathy: prominence of interleukin 4 in restricted disease.

Author

Murray KJ, Grom AA, Thompson SD, Lieuwen D, Passo MH, and Glass DN

Subjects
Adolescent, Adult, Arthritis, Juvenile diagnosis, Arthritis, Juvenile genetics, Child, Child, Preschool, Female, HLA Antigens genetics, Humans, Infant, Male, Polymerase Chain Reaction, RNA, Messenger analysis, Spondylitis diagnosis, Spondylitis genetics, Arthritis, Juvenile immunology, Cytokines metabolism, Interleukin-4 metabolism, Spondylitis immunology, Synovial Fluid immunology, Synovial Membrane immunology
Abstract

Objective: To determine the pattern of expression of Type 1 and Type 2 cytokines in synovial tissues and fluids (SF) of patients with different forms of juvenile rheumatoid arthritis (JRA) and juvenile spondyloarthropathy (JSpA), and to contrast these with findings in adult patients with RA., Methods: Sixty-three SF mononuclear cell preparations and synovial tissue samples from 50 patients with JRA or JSpA and 7 synovial tissues from patients with adult onset RA were analyzed by reverse transcription polymerase chain reaction for the presence or absence of interleukin 2 (IL-2), tumor necrosis factor-beta (TNF-beta), interferon-gamma (IFN-gamma), and IL-10 and IL-4 mRNA., Results: IL-4 mRNA was identified significantly more often in the synovial compartment of patients with pauciarticular onset disease (JRA or JSpA) compared with polyarticular onset JRA (58 vs 14%; p < 0.01) or RA (29%). Similarly, IL-4 mRNA was detected more often in those with a persistently pauciarticular disease course compared to those with a polyarticular course (68 vs 30%; p < 0.01). Furthermore, the combination of IL-4 and IL-10 mRNA was found more frequently in nonerosive compared with erosive disease (38 vs 15%; p < 0.05). IL-2 and TNF-beta mRNA were found in all groups. IFN-gamma mRNA was detected in 33% of those with systemic onset JRA compared with 85% of other types of JRA (p < 0.01)., Conclusion: This study provides further evidence of immunopathological differences between chronic forms of arthritis with childhood onset, and highlights similarities with and differences from adult RA. Our findings suggest that IL-4, possibly in combination with IL-10, has an antiinflammatory or disease restricting role.

Published
1998

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