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RELIABILITY OF LINEAR (n,f,k) SYSTEMS WITH WEIGHTED COMPONENTS

Journal of Systems Science and Systems Engineering 2010年第3期19卷 277-284页

作者： Serkan ERYILMAZ timur aksoy Department of Mathematics Izmir University of Economics Faculty of Computer Science and Engineering Sabanci University

The （n,f, k）： F（G） system consists ofn components and the system fails （works） if and only if there are at least flailed （working） components or at least k consecutive failed （working） components. These system models can be used in electronic equipment, automatic payment systems in banks, and furnace systems. In this paper we introduce and study the （n, f, k）：F and （n, f, k）： G systems consisting of weighted components. Recursive equations are presented for reliability evaluation of these new models. We also provide some conditions on the weights to represent weighted-（n,f, k） systems as usual （n,f, k） systems.

关键词： Consecutive-weighted-k-out-of-n systems system reliability weighted-k-out-of-n systems weighted-(n,f k) systems

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The Evaluation of Efficacy and Side Effects of Radiotherapy in Cerebral Meningiomas

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International Journal of Medical Physics, Clinical Engineering and Radiation Oncology 2020年第4期9卷 157-164页

作者： timur Koca Rahmi Atil aksoy Yasemin Sengün Melek Gamze Aksu Nina Tuncel Mine Genc Ozay Aylin Fidan Korcum Department of Radiation Oncology School of Medicine Akdeniz University Konyaalt&#x131 Turkey

Aims: The current study aimed to evaluate the efficacy, side effects of radiotherapy and factors influencing treatment outcome in patients received radiotherapy for cerebral meningiomas. Methods and Material: In the last two decades, a total of 35 patients with cerebral meningioma who received radiotherapy in our clinic were evaluated statistically in terms of survival, toxicity and prognostic factors. The records of patients diagnosed with cerebral meningioma who underwent postoperative radiotherapy were retrospectively analyzed. Statistical analysis used: Statistical comparisons were made using IBM SPSS v24.0. Kaplan-Meier method was used to compare survival times. Results: Five of the patients had grade I meningioma showing recurrence, 18 were grade II meningioma and 12 were grade III meningioma. Patients were treated with 54 or 60 Gy adjuvant radiotherapy with 2 Gy daily fractions according to histopathological grade and operation type. Three and five-year overall survival rates were 56% and 40%, respectively and median overall survival was 36 months. Progression was observed in 15 of the 35 patients included in the study. Three and five-year progression-free survival (PFS) rates of the patients were 56% and 50%, respectively. There was a statistically significant correlation between histopathological grade and overall survival among patients. However;no statistical difference found in overall survival of patients in terms of tumor location, operation type and age. Conclusions: In the treatment of cerebral meningiomas, changes in radiotherapy dose and field designs can be predicted according to the tumor grade and operation type. In addition, it is thought that large scale studies are needed to determine prognostic factors more meticulously.

关键词： Brain Tumor Cerebral Meningioma Atypical Meningioma Anaplastic Meningioma Radiotherapy Overall Survival

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