İki boyutlu binomial dağılımın genelleşmeleri ve uygulamaları

Bu çalışmada, iki değişkenli binom dağılımının genelleşmeleri ve uygulamaları üzerinde durulmuştur. İki değişkenli binom dağılımının birleşik olasılık fonksiyonu, marjinalleri, olasılık türeten fonksiyonları incelenmiştir. Ayrıca bu dağılımın modifikasyonları ele alınmış ve yeni modeller göz önüne alınmıştır. Aynı zamanda iki değişkenli binom dağılımının iki değişkenli Poisson dağılımına yaklaşımı gösterilmiş olup iki değişkenli binom dağılımının uygulandığı alanlara ilişkin örnekler verilmiştir

İki değişkenli geometrik ve binom dağılımlarının modifikasyonları

Bu çalışmada; iki değişkenli geometrik ve binom dağılımlarının modifikasyonları ve dağılım özellikleri incelenmiştir. Çalışmanın asıl kısmında; iki değişkenli binom dağılımının modifikasyonları, Poisson yaklaşımı ve uyumluluk ölçüsü incelenmiş ve uygulamalarından bazı örnekler verilmiştir. Aynı zamanda Marshall ve Olkin'in iki ve üç değişkenli geometrik dağılımına ilişkin dağılım özellikleri ve uyumluluk ölçüleri araştırılmış ve parametrelerin En Çok Olabilirlik tahmin edicileri hesaplanmıştır. Ayrıca bu dağılımların karakterizasyonları verilmiş ve çok değişkenli duruma genelleştirilmiştir

Reliability analysis of repairable multistate phased mission systems with Markov approach based on states

PurposeThe purpose of this study is to find the reliability of the three-component three-phased mission system, which can be repaired by considering the exponential distribution for repair and failure rates in the transitions between the phases based on states with Markov approach. Also, multilevel-phased mission systems are calculated based on states for partially working states.Design/methodology/approachThe reliabilities of the repairable two-level and three-level three-component three-phased mission systems based on states are calculated with the Markov approach. The structure functions are obtained for each phase of the systems, and differential equations are created by the failure and repair of each working state component. These equations are solved using Laplace method.FindingsReliability values of two-level and three-level three-component three-phased systems with different failure, repair, and time intervals are calculated and compared. The intermediate states that multilevel systems handle differently from two-level systems provide a better investigation of the systems. So, these repairable systems offer transparent information in complex systems like transportation and energy, ensuring appropriate timing and cost for repair operations.Originality/valueThis study is original in terms of calculating the reliability of the repairable phased mission system based on the states using Markov method. It is also important in calculating the reliability of the repairable multilevel phased mission system based on states and making reliability comparisons according to different repair and failure rates, equal and different time intervals

Evaluation of the Efficiency of Public High Schools in İzmir/Turkey Using Deahp Approach

This study is carried out to assess the relative efficiency of the Anatolian high schools in İzmir /Turkey and to guide inefficient educational institutions to become efficient. Firstly, efficiency measurement is performed by Data Envelopment Analysis (DEA) model. Instead of assigning equal weights to the input and output variables, the analysis is repeated by assigning weights with the aid of the Analytic Hierarchy Process(AHP) model. 3 input and 3 output variables are determined in the study and 47 Anatolian High Schools are analyzed. in İzmir, this study is important since it is the first study to assess the efficiency of Anatolian high schools with Data Envelopment Analytic Hierarchy Process (DEAHP) integrated model

Clinicopathologic characteristics and reproductive outcomes of patients with borderline ovarian tumors (BOTs): A single institute experience and a review of the literature

OBLECTIVES: In borderline ovarian tumor (BOT) cases, evaluating the therapy forms, the percentage of recurrence and survival and the condition of fertility after conservative surgery, for those with a fertil- ity wish. STUDY DESIGN: The files, follow-up forms and pathological reports of 96 cases, diagnosed with BOT, at our clinic, treated between 1994-2009, have been retrospectively evaluated. RESULTS: The mean age of the evaluated cases was 39.54±13.4. On the basis of histopathological data, 46 cases (47.9%) had serous and 41 cases (42.7%) had mucinous, and 9 cases (9.4%) had other histological subtypes. 88 cases were in stage I, 2 cases (2.1%) were in stage II and 6 cases (6.2%) were in stage III. 89 (92.7%) cases were operated with laparatomy, 7 (7.3%) cases were operated with laparoscopy. In 52 cases (54.1%), conservative (fertility preserving) surgery was applied (27 cases USO, 8 cases cystectomy, 17 cases USO-staging), in 44 cases (45.8%) radical surgery (in 32 cases, complete staging, TAH-BSO in 11 cases, TAH-USO in 1 case). 26% of the cases (25 cases) underwent postoperative adjuvant chemotherapy. In 39 cases with fertility wish, 8 pregnancy occured after therapy. In the follow-up, 10 cases (10.4%) had recurrence. The rate of recurrence was 4% (2/44) after radical surgery and 15% (8/52) after conservative surgery. The general disease-free survival rate of the cases (DFS) was 89.6%, and there was no significant difference between radical and conservative surgery in view of DFS (95.45% vs 84.62%, p=0.97). CONCLUSION: In cases of borderline ovarian tumor, the best therapy is surgical debulking and the post-operative recurrence rate is generally low. Although the recurrence risk in patients who underwent conservative surgery is relatively higher, disease free survival rates are no different than those who had radical surgeryOBLECTIVES: In borderline ovarian tumor (BOT) cases, evaluating the therapy forms, the percentage of recurrence and survival and the condition of fertility after conservative surgery, for those with a fertil- ity wish. STUDY DESIGN: The files, follow-up forms and pathological reports of 96 cases, diagnosed with BOT, at our clinic, treated between 1994-2009, have been retrospectively evaluated. RESULTS: The mean age of the evaluated cases was 39.54±13.4. On the basis of histopathological data, 46 cases (47.9%) had serous and 41 cases (42.7%) had mucinous, and 9 cases (9.4%) had other histological subtypes. 88 cases were in stage I, 2 cases (2.1%) were in stage II and 6 cases (6.2%) were in stage III. 89 (92.7%) cases were operated with laparatomy, 7 (7.3%) cases were operated with laparoscopy. In 52 cases (54.1%), conservative (fertility preserving) surgery was applied (27 cases USO, 8 cases cystectomy, 17 cases USO-staging), in 44 cases (45.8%) radical surgery (in 32 cases, complete staging, TAH-BSO in 11 cases, TAH-USO in 1 case). 26% of the cases (25 cases) underwent postoperative adjuvant chemotherapy. In 39 cases with fertility wish, 8 pregnancy occured after therapy. In the follow-up, 10 cases (10.4%) had recurrence. The rate of recurrence was 4% (2/44) after radical surgery and 15% (8/52) after conservative surgery. The general disease-free survival rate of the cases (DFS) was 89.6%, and there was no significant difference between radical and conservative surgery in view of DFS (95.45% vs 84.62%, p=0.97). CONCLUSION: In cases of borderline ovarian tumor, the best therapy is surgical debulking and the post-operative recurrence rate is generally low. Although the recurrence risk in patients who underwent conservative surgery is relatively higher, disease free survival rates are no different than those who had radical surger

Development of environment-friendly magnetic nanobiocomposites and full factorial design (FFD) analysis for strontium removal from aqueous solutions

In this study, magnetic (Fe3O4) nanobiocomposite were synthesized by a co-precipitation method using pectin biopolymer as a stabilizer. Nanobiocomposites were characterized via several characterization methods. The particle size and surface area of the nanobiocomposite were found as 5.76 nm 94.651 m(2)/g, respectively. The TEM and SEM results indicated that the spherical nanoparticles were well dispersed into the polymer matrix. Optimal adsorption parameters were determined using FFD. It was determined that pH and initial concentration are the main effects on the Sr(II) removal. Maximum sorption capacities according to D-R and Langmuir isotherms were determined as 0.018 mol/g and 26.455 mg/g, respectively.AcknowledgementsThis study was financially supported by Ege University Scientific Research Project Unit Project No. FGA-2019-20444.Ege University Scientific Research Project Unit Project [FGA-2019-20444