OBJECTIVE: To evaluate the absorbed dose in thyroid follicles due to low-energy electrons such as Auger and internal conversion electrons, besides beta particles, for iodine radioisotopes ( 131 I, 132 I, 133 I, 134 I and 135 I) utilizing the Monte Carlo method. MATERIALS AND METHODS: The dose calculation was performed at follicular level, simulating Auger, internal conversion electrons and beta particles, with the MCNP4C code. The follicles (colloid and follicular cells) were modeled as spheres with colloid diameter ranging from 30 to 500 µ µ µm, and with the same density of water (1.0 g.cm – ³). RESULTS: Considering low-energy particles, the contribution of 131 I for total absorbed dose to the colloid is about 25%, while the contribution due to short-lived isotopes is 75%. For follicular cells, this contribution is still higher achieving 87% due to short-lived iodine and 13% due to 131 I. CONCLUSION: The results of the present study demonstrate the importance of considering low-energy particles in the contribution for the total absorbed dose at follicular level (colloid and follicular cells) due to iodine radioisotopes ( 131 I, 132 I, 133 I, 134 I and 135 I)
Many database applications are written such that they require extensive and computationally-heavy analysis of the data stored; however, this can serve as a bottleneck in many cases. We examine the benets of converting a SQL database
to a NoSQL database for the implementation of an Apriori calculation to determine the most common askets” within a data set. After testing the system with BerkeleyDB, MongoDB, and CouchDB, using the original MySQL implementation as a baseline, we nd that all NoSQL implementations are faster than the RDBMS counterpart, and that the BerkeleyDB implementation runs orders of magnitude faster than all others.
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ترجمه مقاله : محاسبه استقرایی در زمان واقعی با استفاده از پایگاههای داده nosql
چکیده
بسیاری از کاربردهای پایگاه داده به گونه ای نوشته شده اند که نیازمند آنالیزهای وسیع و دارای محاسبات سنگین روی داده ها هستند، اما این می تواند به عنوان یک تنگنا در بسیاری موارد عمل کند. ما فواید تبدیل یک پایگاه داده SQL به یک پایگاه داده NoSQL را برای اجرای محاسبه استقرایی جهت تعیین رایج ترین “سبدهای” درون یک مجموعه داده، مورد آزمایش قرار می دهیم. بعد از آزمایش سیستم با BerkeleyDB، MongoDB و CouchDB با استفاده از اجرای MySQL اصلی به عنوان مبنا، مشاهده کردیم که تمامی اجراهای NoSQL سریع تر از همتای RDBMS هستند و اجرای BerkeleyDB چندین مرتبه سریع تر از سایرین انجام می شود.