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- Z. Li, Volkan Akcelik, +10 authors K. Ko
- 2007

Work supported by the U.S. DOE ASCR, BES, and HEP Divisions under contract No. DE-AC02-76SF00515. The work used the resources of NCCS at ORNL which is supported by the Office of Science of the U.S. DOE under Contract No. DE-AC05-00OR22725, and the resources of NERSC at LBNL which is supported by the Office of Science of the U.S. DOE under Contract No.… (More)

- K. Ko, Tanju Acar
- 1998

We show that the multiplication operation c = a b r 1 in the eld GF(2) can be implemented signi cantly faster in software than the standard multiplication, where r is a special xed element of the eld. This operation is the nite eld analogue of the Montgomery multiplication for modular multiplication of integers. We give the bit-level and word-level… (More)

- K. Ko, A . M . Apohan
- 1997

We describe an algorithm for inverting an iteration of the one-dimensional cellular automaton. The algorithm is based on the linear approximation of the updating function, and requires less than exponential time for particular classes of updating functions and seed values. For example, an n-cell cellular automaton based on the updating function CA30 can be… (More)

- Ronald D. Ruth, C. Adolphsen, +61 authors C. Ziomek
- 1997

The design for the Next Linear Collider (NLC) at SLAC is based on two 11.4 GHz linacs operating at an unloaded acceleration gradient of 50 MV/m increasing to 85 MV/m as the energy is increased from 1/2 TeV to 1 TeV in the center of mass[1]. During the past several years there has been tremendous progress on the development of 11.4 GHz (X-band) RF systems.… (More)

- Romesh C. Batra, K. Ko
- 2002

We have developed an adaptive mesh refinement technique that generates elements such that the integral of the second invariant of the deviatoric strain-rate tensor over an element is nearly the same for all elements in the mesh. It is shown that the finite element meshes so generated are effective in resolving shear bands, which are narrow regions of… (More)

- Deukwoo Kwon, K. Ko, Marina Vannucci, A. L. Narasimha Reddy, S. Kim
- Quality and Reliability Eng. Int.
- 2006

Research Wavelet Methods for the Detection of Anomalies and their Application to Network Traffic Analysis D. W. Kwon1, K. Ko2, M. Vannucci3,∗,†, A. L. N. Reddy4 and S. Kim3 1Radiation Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, 6120 Executive Boulevard, Rockville, MD 20852, U.S.A. 2Department of Mathematics,… (More)

- Michael A. Allen, Richard S. Callin, +20 authors Brian W Mecklenburg
- 1990

The next generation of linear colliders requires peak power sourcesof-over 200 MW per meter at frequencies above 10 GHz at pulse widths of less than 100 nsec. Several power sources are under active development, including a conventional klystron with RF pulse compression, a relativistic klystron (RK) and a crossed-field amplifier. Power from one of these has… (More)

A high-power low-loss mode transducer design has been proposed to adapt the output of the X-Band klystron, WR.90 rectangular waveguide, to the input of the pulse compression system, SLED II, which utilizes overmoded circular waveguides operating in the low-loss TEol mode. This device is much more compact than the conventional Marie’ type mode converters.… (More)

- W . R . Fowkes, Michael A. Allen, +15 authors Perry Wilson
- 1990

The next linear collider will require 200 MW of RF power per meter of linac structure at relatively high frequency to produce an acc.elerating gradient of about 100 MV/m. The higher frequencies result in a higher breakdown threshold in the accelerating structure hence permit. higher a.ccelerating gradients per meter of linac. The lower frequencies have the… (More)

- Katherine Thompson, C . Adolphsen, +13 authors Robert L. Gluckstern
- 1993

In order to obtain high luminosity and energy efficiency in future linear colliders, it is desirable to accelerate a train of closely spaced bunches on each rf pulse of the machine. There can be severe multibunch beam break-up in such a collider unless some means of strongly suppressing the transverse wakefield is incorporated into the design of the… (More)