AJP	ISSN : 0971 – 3093 Vol  8, No 2, April – June, 1999

Asian
Journal of Physics

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Vol  8, No 2, April – June, 1999

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Content

 

Optical Information Processing : A bibliographic review for the year 1997

G S Pati, Renu Tripathi and Kehar Singh

105

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

Yong-Hae Kim and Jong-Jean Kim

155

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

Sandeep Kumar Ray

167

Effects of frequency matching and substituent groups on first-order hyperpolarizability of disubstituted benzenes                                                            

Gunjan Purohit and G C Joshi

171

Fluorescence spectroscopic investigations of normal and tumor human breast tissues                                                                                                          

R N Panda, Asha Agarwal and Asima Pradhan

179

Amplitude-squared squeezing in parametric amplification

Jawahar Lal, R M P Jaiswal and B S Rajput

185

Some properties of alkali halide crystals

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

191

CH overtone spectrum of methyl cyanide: a C_3v coupled oscillator analysis using Fermi resonance corrected local mode parameters

T M A Rasheed and A Shaji

199

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

L A Udachan, M S Jogad and S Rama Rao

207

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

R P Singh, Rakesh and L K Mishra

213

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

S P Sharon and R P Singh

217

Spectroscopic investigations of Cu²⁺ doped phosphate glass

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

223

 

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

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

227

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

Alpana Sharma, Asma Sohail Farooqui and Z H Zaidi

233

 

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,

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.