5,811 to 5,820 of 6,809 Results
Nov 1, 2004
Mannucci, Anthony J.; Hajj, G. A.; Iijima, B. A.; Komjathy, A.; Meehan, T.; Pi, X. Q.; Srinivasan, J.; Tsurutani, B. T.; Wilson, B. D.; Zhang, L. D.; Moldwin, Mark, 2004, "GPS-based remote sensing of the geospace environment: horizontal and vertical structure of the ionosphere and plasmasphere", https://hdl.handle.net/2014/37523, Remote Sensing of the Atmosphere, Ocean, Environment, and Space 2004, Honolulu, HI, November 8-12, 2004, JPL Open Repository
We will discuss a new data assimilation model of ionosphere, the Global Assimilative Ionosphere Model (GAIM), capable of integrating measurements from GPS and other sensors with a physics-based ionospheric model, to provide detailed global nowcasts of ionospheric structure, usefu... |
Nov 1, 2004
Hughes, J. Steven; Crichton, Dan; Kelly, Sean; Crichton, Jerry; Tran, Thuy, 2004, "Intelligent resource discovery using ontology-based resource profiles", https://hdl.handle.net/2014/38074, 19th International CODATA Conference, Berlin, Germany, November 7-10, 2004, JPL Open Repository
Successful resource discovery across heterogeneous repositories is strongly dependent on the semantic and syntactic homogeneity of the associated resource descriptions. Ideally, resource descriptions are easily extracted from pre-existing standardized sources, expressed using sta... |
Nov 1, 2004
Hishinuma, Yoshikazu; Yang, Eui-Hyeok; Cheng, Jian-Gong; Trolier-McKinstry, Susan, 2004, "Optimized design, fabrication and charactrization of PZT unimorph microactuators for deformable mirrors", https://hdl.handle.net/2014/38591, ASME International Mechanical Engineering Congress and RD&D Expo, JPL Open Repository
This paper describes an optimization of PZT unimorph membrane microactuators in view of their application to deformable mirrors (DMs). |
Nov 1, 2004
Hamkins, Jon, 2004, "Low-complexity approximations to maximum likelihood MPSK modulation classification", https://hdl.handle.net/2014/38262, Proceedings of Globecom 2004, Dallas, TX, November 29, 2004, JPL Open Repository
We present a new approximation to the maximum likelihood classifier to discriminate between M-ary and M'-ary phase-shift-keying transmitted on an additive white Gaussian noise (AWGN) channel and received noncoherentl, partially coherently, or coherently. |
Oct 31, 2004
Abbasfar, Aliazam; Divsalar, Dariush; Yao, Kung, 2004, "Accumulate Repeat Accumulate Coded Modulation", https://hdl.handle.net/2014/40695, IEEE Military Communications Conference, Monterey, California, October 31 - November 3, 2004., JPL Open Repository
In this paper we propose an innovative coded modulation scheme called "Accumulate Repeat Accumulate Coded Modulation" (ARA coded modulation). This class of codes can be viewed as serial turbo-like codes, or as a subclass of Low Density Parity Check (LDPC) codes that are combined... |
Oct 31, 2004
Abbasfar, Aliazam; Divsalar, Dariush; Yao, Kung, 2004, "Milcom 04 paper ID# 1158 : a new class of turbo-like codes with efficient and practical high-speed decoders", https://hdl.handle.net/2014/40731, IEEE Military Communications Conference, Monterey, California, October 31 - November 3, 2004., JPL Open Repository
Turbo codes not only achieve near Shannoncapacity performance, but also have decoders with modest complexity, which is crucial for implementation. So far efficient architectures for decoding of turbo codes have been proposed that is suitable for serial processing. In this paper a... |
Oct 31, 2004
Ho, Christian; Wang, Charles; Gritton, Kelly; Angkasa, Kris, 2004, "Microwave propagation attenuation due to Earth's atmosphere and weather at SHF band", https://hdl.handle.net/2014/40747, Military Communications Conference, Monterey, California, October 31 - November 3, 2004, JPL Open Repository
In this study we have estimated radio wave propagation losses at SHF band by applying available propagation models into several Air Force benchmark scenarios. The study shows that dominantly additional losses over the free space loss are atmospheric absorption, clouds, fog, and p... |
Oct 25, 2004
Wagstaff, Kiri L.; Laidler, Victoria G., 2004, "Making the most of missing values : object clustering with partial data in astronomy", https://hdl.handle.net/2014/39554, Astronomical Data Analysis and Software Systems, Pasadena, California, October 25, 2004., JPL Open Repository
We demonstrate a clustering analysis algorithm, KSC, that a) uses all observed values and b) does not discard the partially observed objects. KSC uses soft constraints defined by the fully observed objects to assist in the grouping of objects with missing values. We present an an... |
Oct 24, 2004
Backus, Charles R.; Velusamy, T.; Thompson, T.; Arballo, J., 2004, "HiRes: super-resolution for the Spitzer Space Telescope", https://hdl.handle.net/2014/39112, Astronomical Data Analysis and Systems XIV (ADASS), Pasadena, California, October 24-27, 2004, JPL Open Repository
We present a description of hires, a super-resolution program based upon the Richardson-Lucy algorithm, generalized to the case of redundant coverage, with higher order optical image distortion, implemented for the Sptizer Space Telescope. |
Oct 24, 2004
Jacob, Joseph C.; Katz, Daniel S.; Miller, Craig D.; Walia, Harshpreet; Williams, Roy; Djorgovski, S. George; Graham, Matthew J.; Mahabal, Ashish; Babu, Jogesh; Berk, Daniel E. Vanden; Nichol, Robert, 2004, "Grist : grid-based data mining for astronomy", https://hdl.handle.net/2014/39570, Astronomical Data Analysis Software & Systems, ADASS-2004, Pasadena, California, October 24-27, 2004., JPL Open Repository
The Grist project is developing a grid-technology based system as a research environment for astronomy with massive and complex datasets. This knowledge extraction system will consist of a library of distributed grid services controlled by a workflow system, compliant with standa... |
