Mitigation of optical turbulence effects using a modified simplex optimization approach: experimental study

2007 ◽  
Author(s):  
Rahul M. Khandekar ◽  
Vladimir V. Nikulin ◽  
Jozef Sofka
Keyword(s):  
Experimental Study ◽  
Optimization Approach ◽  
Optical Turbulence ◽  
Simplex Optimization ◽  
Turbulence Effects

A Deterministic Approach to XML Query Processing with Efficient Support for Pure and Negated Containments

2009 ◽  
pp. 2059-2078
Author(s):  
Dunren Che
Keyword(s):  
Experimental Study ◽  
Query Processing ◽  
Recent Work ◽  
Optimization Approach ◽  
Deterministic Approach ◽  
Xml Query Processing ◽  
Transformation Rules ◽  
Processing Optimization ◽  
Optimization Efficiency ◽  
Xml Data Management

This article reports the result of the author’s recent work on XML query processing/optimization, which is a very important issue in XML data management. In this work, in order to more effectively and efficiently handle XML queries involving pure and/or negated containments, a previously proposed deterministic optimization approach is largely adapted. This approach resorts to heuristic-based deterministic transformations on algebraic query expressions in order to achieve the best possible optimization efficiency. Specialized transformation rules are thus developed, and efficient implementation algorithms for pure and negated containments are presented as well. Experimental study confirms the validity and effectiveness of the presented approach and algorithms in processing of XML queries involving pure and/or negated containments.

A Deterministic Approach to XML Query Processing with Efficient Support for Pure and Negated Containments

2011 ◽  
pp. 175-194
Author(s):  
Dunren Che
Keyword(s):  
Experimental Study ◽  
Query Processing ◽  
Recent Work ◽  
Optimization Approach ◽  
Deterministic Approach ◽  
Xml Query Processing ◽  
Transformation Rules ◽  
Processing Optimization ◽  
Optimization Efficiency ◽  
Xml Data Management

This article reports the result of the author’s recent work on XML query processing/optimization, which is a very important issue in XML data management. In this work, in order to more effectively and efficiently handle XML queries involving pure and/or negated containments, a previously proposed deterministic optimization approach is largely adapted. This approach resorts to heuristic-based deterministic transformations on algebraic query expressions in order to achieve the best possible optimization efficiency. Specialized transformation rules are thus developed, and efficient implementation algorithms for pure and negated containments are presented as well. Experimental study confirms the validity and effectiveness of the presented approach and algorithms in processing of XML queries involving pure and/or negated containments.

Estimating optical turbulence effects on free-space laser communication: modeling and measurements at ARL's A_LOT facility

2004 ◽  
Author(s):  
Yeonju Han Oh ◽  
Jennifer C. Ricklin ◽  
Eun Oh ◽  
Stephen Doss-Hammel ◽  
Frank D. Eaton
Keyword(s):  
Free Space ◽  
Laser Communication ◽  
Optical Turbulence ◽  
Turbulence Effects
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