Person: ÇİLİNGİRTÜRK, AHMET METE
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ÇİLİNGİRTÜRK
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AHMET METE
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Publication Metadata only Simulation-based optimisation approach to multi-choice transportation problem(2022-01-01) YILMAZ SOYDAN, NACİYE TUBA; ÇİLİNGİRTÜRK, AHMET METE; YILMAZ SOYDAN N. T. , ÇİLİNGİRTÜRK A. M.Copyright © 2022 Inderscience Enterprises Ltd.The classical transportation problem minimises the total costs of transportation of a unique product from various supply points (or warehouses) to demand points. The problem assumes that freight costs from source to destination are constant and that the supply and demand quantities are equal and strictly known, so the market for the product is well-balanced. It thus involves a special type of linear integer programming, which becomes stochastic since the constraints or parameters are random variables from a known or unknown distribution. Several studies have formulated well-known deterministic models under probabilistic restrictions. The transformed models mostly keep the confidence level at a given minimum constant or else minimise the error level. Also, there is a multi-choice stochastic transportation problem, which introduces several unit costs. In this study, we try to simulate Roy\"s (2014) multi-choice stochastic transport model with random supply and demand quantities from a given Weibull distribution and compare the results of distribution and total costs. As a result of the simulation, total cost value was estimated lower than the result of the problem.Publication Metadata only Human Development Index (HDI) Rank-Order Variability(SPRINGER, 2018) ÇİLİNGİRTÜRK, AHMET METE; Cilingirturk, Ahmet M.; Kocak, HabipIn accordance with the increasing demand for information, indices are created and national and global rankings made to represent and through which to understand and build policy related to complex situations, processes and trajectories. Different indices for a single concept are also created that have advantages or disadvantages over one another or to overcome certain calculation problems. As one such, the Human Development Index (HDI) presently lists countries according to four different criteria, and remains at the heart of democratic and humanitarian recovery efforts. This type of indicator is taken as a function of past performances, with high performances being the extreme values at positively skewed distributions. Thus, the variability of each unit's repeated measures is regarded as the result of efforts made between the measurement time points (in the HDI case, of a country to promote development). However, it is assumed that the variability of the units is not homogenous. Here, it is shown that in the HDI case, high performance units show relatively low variability, whereas the middle and middle-low performance units show a high variability. Cluster analysis and Friedman test have been used to determine the characteristics of ordered country rankings. The variability of rank-order should also be taken into account besides the location on the list by clustering the countries according to HDI.Publication Metadata only Upper reference limits for serum thyroid stimulating hormone levels in Turkish children(PERGAMON-ELSEVIER SCIENCE LTD, 2014) ÇİLİNGİRTÜRK, AHMET METE; Aral, H.; Ozer, O. F.; Onur, H.; Cilingirturk, A. M.; Akyildiz, M.; Ozgen, I. T.; Guvenen, G.; Kacan, P. A.; Comert, S.; Serin, E.Publication Metadata only Pediatric reference intervals of free thyroxine and thyroid stimulating hormone in three different hospitals(WALTER DE GRUYTER GMBH, 2018) ÇİLİNGİRTÜRK, AHMET METE; Aral, Hale; Ozer, Omer Faruk; Onur, Hatice; Cilingirturk, Ahmet Mete; Ozgen, Ilker Tolga; Ayyildiz, MevludeObjective: Using data retrieved from three different hospitals, we established indirect reference intervals of free thyroxine (FT4) and thyroid stimulating hormone (TSH) for the Centaur XP or the Immulite 2000 instruments, in separate reference limits at each subset. Methods: We categorized children into seven age groups: 4-7 days, 8-15 days, 16-23 days, 24-61 days, 3-6 months, 7-36 months and 4-6 years. After a Box-Cox transformation was employed, we followed the Horn algorithm to eliminate the extreme values. Results: The remaining FT4 (11,230) and TSH (11,274) tests were statistically analyzed. We determined separate reference limits at each subset with their own 2.5th and 97.5th percentiles. The interaction effect of both hospital and age grouping on FT4 was meaningful, but there was no interaction effect on TSH. Conclusions: Pediatric FT4 and TSH test results should be interpreted via narrowed age groups, especially in the first 3 weeks of neonatal period. Our reference limits may be recommended in pediatric follow-ups, considering the conditions of prematurity, birth-weight or multiple births. Preanalytical and analytical variations related with complex molecular structure of FT4 should be taken into consideration to ensure the validity of the result.Publication Metadata only İllerde yaşam endeksinin mekansal analizi(Nobel, 2022-01-01) ERGÜT, ÖZLEM; ÇİLİNGİRTÜRK, AHMET METE; ERGÜT Ö., ÇİLİNGİRTÜRK A. M.Publication Metadata only Compatibility of mechanical and computerized axiographs: A pilot study(MOSBY-ELSEVIER, 2005) ÇİLİNGİRTÜRK, AHMET METE; Kucukkeles, N; Ozkan, H; Ari-Demirkaya, A; Cilingiturk, AMStatement of problem. There is little known information comparing axiographic data obtained with a mechanical device and data obtained with a computerized device. However, long-term follow-up of patients may necessitate comparison of previously made mechanical axiographic data with records obtained through computer-aided axiography. Purpose. The purpose of this study was to compare measurements between mechanical and Computerized axiographs in recording the rotational and translation movements of the mandible. Material and methods. The study enrolled 31 subjects with no detectable clinical signs of ternporomandibular disorders. A single operator obtained 3 separate axiographic tracings of right and left condylar paths for each subject, using repeated opening, closing, protrusive, and retrusive movements. Data were collected for both the mechanical (SAM Axiograph Axo 200), and the computerized axiographs (SAM Axiotron and Axo 500). Angular (degrees) and linear measurements (turn) for the mechanical axiograph were made from the tracings obtained on grid paper using a compass, ruler, and protractor. The computer performed the measurements for the computerized axiograph tracings. All parameters were compared statistically with a Wilcoxon signed rank test (alpha=.05). The same operator remeasured all mechanical axiographic tracings for 20 subjects 1 week later to evaluate measurement error. Chronbach's alpha was used as a measure of consistency between the 2 measurements. Results. Mean opening and closing angles varied between 52.4 and 54.2 degrees, and mean protrusive, and retrusive angles varied between 50.1 and 54.9 degrees. Mean opening and closing distances varied between 11.4 and 12.3 mm, and mean protrusive and retrusive distances varied between 8.2 and 8.7 mm. Comparison with the Wilcoxon signed rank test showed no significant differences for any parameter tested. There were high and medium inter-item correlations between repeated measurements of the manual device when Chronbach's alpha was applied, but these results were not sufficient to prove consistency between 2 consecutive measurements. Conclusion. The results showed nonsignificant differences between the recordings of the mechanical and computerized axiographs tested. The authors hypothesize that minor differences may be attributed to hand-measuring errors for the tracings generated by the mechanical axiograph. This study is limited due to the impact of poor precision of the manual device on the study results when these recordings are compared to another instrument. Therefore, it is not possible to conclude that data from the manual and the computerized axiographs arc compatible with each other.Publication Metadata only Assessment of average of normals (AON) procedure for outlier-free datasets including qualitative values below limit of detection (LoD): an application within tumor markers such as CA 15-3, CA 125, and CA 19-9(TAYLOR & FRANCIS LTD, 2016) ÇİLİNGİRTÜRK, AHMET METE; Usta, Murat; Aral, Hale; Mete Cilingirturk, Ahmet; Kural, Alev; Topac, Ibrahim; Semerci, Tuna; Koseoglu, Mehmet HicriAverage of normals (AON) is a quality control procedure that is sensitive only to systematic errors that can occur in an analytical process in which patient test results are used. The aim of this study was to develop an alternative model in order to apply the AON quality control procedure to datasets that include qualitative values below limit of detection (LoD). The reported patient test results for tumor markers, such as CA 15-3, CA 125, and CA 19-9, analyzed by two instruments, were retrieved from the information system over a period of 5 months, using the calibrator and control materials with the same lot numbers. The median as a measure of central tendency and the median absolute deviation (MAD) as a measure of dispersion were used for the complementary model of AON quality control procedure. The u(bias) values, which were determined for the bias component of the measurement uncertainty, were partially linked to the percentages of the daily median values of the test results that fall within the control limits. The results for these tumor markers, in which lower limits of reference intervals are not medically important for clinical diagnosis and management, showed that the AON quality control procedure, using the MAD around the median, can be applied for datasets including qualitative values below LoD.Publication Metadata only Comparative analysis of EU and candidate countries resource efficiency(2011-11-01) ÇİLİNGİRTÜRK, AHMET METE; Kocak H., ÇİLİNGİRTÜRK A. M.European Union is a regional integration project with its social and economic objectives. it is an important economic power competing with U.S. at west and with Chine at east. It aims the economic homogeneity of the member states and candidate countries in its region. This study aims to rank 27 EU members and 3 candidate countries according to their assumed input-output structures for the years 2002 and 2006. CCR and BCC Data Envelopment Analysis models were used to determine relative efficiency, so effective and non-effective countries were discriminated. Furthermore Super-Efficiency model of DEA was used to evaluate the effective countries. The findings are interpreted as that the EU achieves some of the specified important objectives.Publication Metadata only İllerde yaşam endeksinin mekansal analizi(Nobel, 2022-01-01) ERGÜT, ÖZLEM; ÇİLİNGİRTÜRK, AHMET METE; ERGÜT Ö., ÇİLİNGİRTÜRK A. M.Publication Metadata only STATA ile veri girişi ve çok değişkenli analiz varsayımlarının incelenmesi(Nobel, 2022-01-01) ÇİLİNGİRTÜRK, AHMET METE; ÇİLİNGİRTÜRK A. M., USTA D. C.