An International Research Journal

AJP

SSN : 0971 - 3093

Vol  8, No 2, April - June, 1999

Asian Journal of Physics                                                                                                                       Vol. 8, No 2 (1999)

Content


Optical Information Processing : A bibliographic review for the year 1997                                                                                                                        105

G S Pati, Renu Tripathi and Kehar Singh


Temperature dependence of nonlinear dielectric constant in thiourea [SC(NH2)2] crystal                                                                                                    155

Yong-Hae Kim and Jong-Jean Kim


Evaluation of excess Gibb's energy of mixing in extremely dilute solution of amines in benzene and p-xylene using dielectric probe                                         167

Sandeep Kumar Ray


Effects of frequency matching and substituent groups on first-order hyperpolarizability of disubstituted benzenes                                                                 171
Gunjan Purohit and G C Joshi


Fluorescence spectroscopic investigations of normal and tumor human breast tissues                                                                                                        179

R N Panda, Asha Agarwal and Asima Pradhan


Amplitude-squared squeezing in parametric amplification                                                                                                                                                 185

Jawahar Lal, R M P Jaiswal and B S Rajput


Some properties of alkali halide crystals                                                                                                                                                                        191

Masroor Hasan, Sunil K Singh, Devendra Prasad and L K Mishra


CH overtone spectrum of methyl cyanide: a C3v coupled oscillator analysis using Fermi resonance corrected local mode parameters                                       199

T M A Rasheed and A Shaji


Effects of thickness on the activation energies of chromium and tin films                                                                                                                         207

L A Udachan, M S Jogad and S Rama Rao


An evaluation of transition temperature and effective magnetic penetration  depth in organic superconductors                                                                       213

R P Singh, Rakesh and L K Mishra


An evaluation of cohesive energy of the alkali metals with long-range and short-range correlations                                                                                      217

S P Sharon and R P Singh


Spectroscopic investigations of Cu2+ doped phosphate glass                                                                                                                                           223

RVSSN Ravikumar, A V Chandrasekhar, B J Reddy and Y P Reddy


Chemical shift and X-ray K-absorption fine structure studies of copper (II) complexes with substituted hydroxypyridines                                                     227

Ashutosh Mishra, Dilip Pandey, P A Kekre and Rajesh K Dubey            


Role of boric acid as shift reagent on the electronic absorption spectra of dihydroxyanthraquinones                                                                                     233

Alpana Sharma, Asma Sohail Farooqui and Z H Zaidi


Asian Journal of Physics                                                                                                           Vol 8, No 2 (1999) 105-154

REVIEW ARTICLE


Optical Information Processing:

A bibliographic review for the year 1997.

 

G.S. PATI#, RENU TRIPATHI and KEHAR SINGH.

Photonics Group, Department of Physics,Indian Institute of Technology Delhi,

New Delhi - 110 016, India.

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Research in the area of optical information processing is marked by significant developments over the years. Advances in processing systems and algorithms have enabled researchers to realize operations under practical field conditions and in real-time. Optical processors are finding applications in the areas where digital and microelectronics growth technologies demonstrate limitations. Liquid crystal based spatial light, modulators and recently developed smart pixel technology have shown high potential for optical processing systems. Pattern recognition is one of the widely pursued application areas under information processing. It is computationally demanding. Optical correlation techniques find applications in biometrics and security verifications, medical diagnosis, quality assessment, and navigation etc.

Present article contains a qualitative review of the literature and a comprehensive listing of research articles published in the year 1997 in the area of optical information processing. The article chiefly concentrates on optical pattern recognition (OPR) and incorporates multiple facets and approaches followed by different researchers over the year. Special emphasis has been given to improvised systems, correlator architectures, correlation filter, distortion invariant PR systems, optimum processors etc. Computing paradigms discussed in the present article chiefly fall into analog, digital, and analog-digital hybrid optical processing systems. There are separate sections on upcoming high potential techniques such as neural networks, fractional Fourier transform, and optical interconnects. We do not claim the listing of the articles to be complete and would welcome any suggestion as to the addition of the missing references.

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