Various parallel implementations of algorithms for the QR decomposition of a matrix are compared using shared memory multiprocessors. algorithms based on both Givens and Householder transformations are considered. A n...
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Various parallel implementations of algorithms for the QR decomposition of a matrix are compared using shared memory multiprocessors. algorithms based on both Givens and Householder transformations are considered. A number of parallelisation techniques are used with particular emphasis on algorithms which allocate work to tasks dynamically. The results indicate that one version is significantly better than the others.
The function of a treatment planning program is to graphically simulate radiation dose distributions from proposed radiation therapy treatments. While many such programs are available which provide this much needed se...
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The function of a treatment planning program is to graphically simulate radiation dose distributions from proposed radiation therapy treatments. While many such programs are available which provide this much needed service, none addresses the question of how to intercompare calculation and display techniques. A program system designed for support of research efforts, particularly development and testing of new calculation algorithms, is described. The system emphasizes a modular flexible structure, enabling programs to be developed somewhat as interchangeable parts. The multiple variants of a calculation algorithm can be compared without undue software overhead or additional data management. Unusual features of the system include extensive use of command procedures, logical names and a structured language (PASCAL). These features are described along with other implementation details. Obstacles, limitations and future applications are also discussed.
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