References Image Compression by Edge Pattern Learning Using Multilayer P Erc E Ptro N S
1 AKIBA, s., GOTO, K., YAMAMOTO, s., and WAKABAYASHI, H.: ‘Recent progress of transoceanic optical amplifier transmission system’. ECOC ’92, Invited papers, September 1992, pp. 719-726 2 IEEE standard 802.6, DQDB subnetwork of a MAN, July 1991 3 KOA& K. T., and OISHANSKY, R.: ‘Non-regenerative photonic dual bus with optical amplifiers’, to be published in I E E E Photonics Technol. Lett. 4 GILES, c. R., and DESURVIRE, E.: ‘Propagation of signal and noise in concatenated erbium-doped fiber amplifiers’, J. Lightwave Techno[., 1991, LT-9, pp. 147-154 KANNO, N., and ITO, K.: ‘Fiber-optic subcarrier multiplexing video transport employing multilevel QAM, IEEE J. Sel. Areas Commun., 1990, SAC-8, pp. 1313-1319 6 ELREFAIE, A. F., WAGNER, . E., ATLAS, D. A., and DAUT, D. G.: ‘Chromatic dispersion limitations in coherent lightwave transmission systems’, J. Lightwaue Technof., 1988, LT-6, pp. 704-709 7 AUWUIN, o., PRIGENT, L. and HAMAIDE, J.-P.: ‘Limitations on transoceanic optical communications by dispersion, Ken nonlinearity and amplifier noise’. ECOC ’91, Invited papers, September 1991, pp, 67-74 8 AGRAWAL, G. P.: ‘Nonlinear fiber optics’ (Academic Press, San Diego, CA, 1989) 5
Improved neural structures for image compression
The problem considered is the effective compression of image data. Compared to the many methods which allow for high compression factors (mainly based on the DCT), the proposed neural approaches offer, after a suitable training, comparable performance both in terms of perceived image quality and measured SNR. Moreover, they are able to perform in the same step the two main required operations of transformation and selection of the most significant terms, with a correspondingly smaller computational effort.<<ETX>>
Monte carlo simulation of events with Drell-Yan lepton pairs from antiproton-proton collisions
The complete knowledge of the nucleon spin structure at leading twist requires also addressing the transverse spin distribution of quarks, or transversity, which is yet unexplored because of its chiral-odd nature. Transversity can be best extracted from single-spin asymmetries in fully polarized Drell-Yan processes with antiprotons, where valence contributions are involved anyway. Alternatively, in single-polarized Drell-Yan the transversity happens convoluted with another chiral-odd function, which is likely to be responsible for the well known (and yet unexplained) violation of the Lam-Tung sum rule in the corresponding unpolarized cross section. We present Monte Carlo simulations for the unpolarized and single-polarized Drell-Yan pp{sup ({up_arrow}}{sup )}{yields}{mu}{sup +}{mu}{sup -}X at different center-of-mass energies in both configurations where the antiproton beam hits a fixed proton target or it collides on another proton beam. The goal is to estimate the minimum number of events needed to extract the above chiral-odd distributions from future measurements at the high energy storage ring (HESR) at GSI. It is important to study the feasibility of such experiments at HESR in order to demonstrate that interesting spin physics can be explored already using unpolarized antiprotons.