The study presented in this article involves the estimation of the overall heat transfer coefficient of cooling system in RF capacitive hyperthermia treatment using inverse problem based on the conjugate gradient meth...The study presented in this article involves the estimation of the overall heat transfer coefficient of cooling system in RF capacitive hyperthermia treatment using inverse problem based on the conjugate gradient method to provide improved distribution of temperature. The temperature data computed numerically from the direct problem using the finite difference time domain method are used to simulate the temperature measurements. The effects of the errors and sensor positions upon the precision of the estimated results are also considered. The results show that a reasonable estimation of the unknown can be obtained. Finally, measurements in a tissue-equivalent phantom are employed to appraise the reliability of the presented method. The comparison of computed data with measurements shows a good agreement between numerical and experimental results.展开更多
Despite extensive research on R-trees, most of the proposed schemes have notbeen integrated into existing DBMS owing to the lack of protocols of concurrency control. R-linktree is an acceptable data structure to deal ...Despite extensive research on R-trees, most of the proposed schemes have notbeen integrated into existing DBMS owing to the lack of protocols of concurrency control. R-linktree is an acceptable data structure to deal with this issue, but problems like phantom still exist.In this paper, we focus on a conflict detection scheme based on R-link tree for completeconcurrency control. An in-memory operation control list is designed to suspend conflictingoperations . The main features of this approach are (1) it can be implemented easily and does notneed any extra information ; (2) No deadlocks are involved in locking scheme ; (3) Non-conflictingoperations are not restricted ; and (4) Phantom problems in R-link tree are avoided throughbeforehand predication . The experiment results show that this scheme is correct and gains bettersystem performance.展开更多
文摘The study presented in this article involves the estimation of the overall heat transfer coefficient of cooling system in RF capacitive hyperthermia treatment using inverse problem based on the conjugate gradient method to provide improved distribution of temperature. The temperature data computed numerically from the direct problem using the finite difference time domain method are used to simulate the temperature measurements. The effects of the errors and sensor positions upon the precision of the estimated results are also considered. The results show that a reasonable estimation of the unknown can be obtained. Finally, measurements in a tissue-equivalent phantom are employed to appraise the reliability of the presented method. The comparison of computed data with measurements shows a good agreement between numerical and experimental results.
文摘Despite extensive research on R-trees, most of the proposed schemes have notbeen integrated into existing DBMS owing to the lack of protocols of concurrency control. R-linktree is an acceptable data structure to deal with this issue, but problems like phantom still exist.In this paper, we focus on a conflict detection scheme based on R-link tree for completeconcurrency control. An in-memory operation control list is designed to suspend conflictingoperations . The main features of this approach are (1) it can be implemented easily and does notneed any extra information ; (2) No deadlocks are involved in locking scheme ; (3) Non-conflictingoperations are not restricted ; and (4) Phantom problems in R-link tree are avoided throughbeforehand predication . The experiment results show that this scheme is correct and gains bettersystem performance.
