This paper deals with one of the most critical computing problems which is Cryptography application, it is one of the problem that needs high computing power resources. This paper introduces Symmetric Key Cryptography using DES (Data Encryption Standard) algorithm and employs a computing Grid for dealing with this problem. It presents a Grid for solving this problem that has been implemented by Alchemi which is an open source project developed at the University of Melbourne, which provides middleware for creating an enterprise grid computing environment by harnessing windows machines. The grid has been tested and results have been analyzed, there was an increase in performance over the single processor, but the performance improvement is limited by the I/O and communication overhead.
Background: Microsurgical tissue transfer has constantly improved the therapeutic options for reconstruction in the head and neck region, but the ideal flap has yet to be found. The purpose of this study is to discuss the aesthetic and functional potential of the free gracilis muscle flap in difficult head and neck reconstruction. Patients and Methods: We report our experience with the free gracilis muscle flap in eleven patients who underwent reconstruction in the head and neck region for a variety of indications. Results: In all eleven patients, the transplanted muscle flaps healed well, with no flap loss. Postoperative complications consisted of donor-site morbidity that was minimal in all patients. Conclusion: For difficult reconstruction in the head and neck region, the free gracilis muscle flap offers a number of advantages, including reliable vascular anatomy, relatively great plasticity and a concealed donor area. Thus this type of flap offers a valuable option whenever an aesthetically and functional pleasing result is sought.
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