89 research outputs found
Comparing clusterings and numbers of clusters by aggregation of calibrated clustering validity indexes
No full textAkhanli, Serhat Emre/0000-0001-7173-3277WOS: 000543319300001A key issue in cluster analysis is the choice of an appropriate clustering method and the determination of the best number of clusters. Different clusterings are optimal on the same data set according to different criteria, and the choice of such criteria depends on the context and aim of clustering. Therefore, researchers need to consider what data analytic characteristics the clusters they are aiming at are supposed to have, among others within-cluster homogeneity, between-clusters separation, and stability. Here, a set of internal clustering validity indexes measuring different aspects of clustering quality is proposed, including some indexes from the literature. Users can choose the indexes that are relevant in the application at hand. In order to measure the overall quality of a clustering (for comparing clusterings from different methods and/or different numbers of clusters), the index values are calibrated for aggregation. Calibration is relative to a set of random clusterings on the same data. Two specific aggregated indexes are proposed and compared with existing indexes on simulated and real data.EPSRCEngineering & Physical Sciences Research Council (EPSRC) [EP/K033972/1]The work of the second author was supported by EPSRC grant EP/K033972/1
Classification of juvenile myoclonic epilepsy data acquired through scanning electromyography with machine learning algorithms
No full textOsman, Onur (Arel Author), Özekes, Serhat (Arel Author)In this paper, classification of Juvenile Myoclonic Epilepsy (JME) patients and healthy volunteers included into Normal Control (NC) groups was established using Feed-Forward Neural Networks (NN), Support Vector Machines (SVM), Decision Trees (DT), and Na < ve Bayes (NB) methods by utilizing the data obtained through the scanning EMG method used in a clinical study. An experimental setup was built for this purpose. 105 motor units were measured. 44 of them belonged to JME group consisting of 9 patients and 61 of them belonged to NC group comprising ten healthy volunteers. k-fold cross validation was applied to train and test the models. ROC curves were drawn for k values of 4, 6, 8 and 10. 100% of detection sensitivity was obtained for DT, NN, and NB classification methods. The lowest FP number, which was obtained by NN, was 5
Political Endowments and Electricity Market Regulation in Turkey: An Institutional Analysis
No full textTurkey has been going through a liberalization process in its electricity market over the last decade. So far, the regulatory content of the market reforms has been in the center of attention in the literature, to the negligence of regulatory governance. However, recent studies, which applied the theoretical insights of new institutional economics to utilities regulation, have demonstrated that political endowments of the country draw the boundaries to which extent such regulatory content can be effectively implemented. In line with these studies, this paper adopts an institutional approach and attempts to identify the political endowments of Turkey in order to further analyze whether the market reforms succeeded in bringing about sufficient checks to cure the institutional problems. In other words, the paper takes a picture of the overall regulatory arena. The results show that the current regulatory structure, especially government-regulator relations, fails to meet good regulatory governance criteria. The paper also provides some policy suggestions.electricity regulation; regulatory governance; institutions
Reflections on methodology for assessing campus sustainability from a Turkish perspective
No full textAim: The author provides a critical reflection of the questionnaire discussed at the workshop “Methodology for assessing the campus sustainability from the perspective of multi-level antifragility” held on Friday 13 May at the WSB University in Wrocław. The author reflects from the background of his experience in Turkey. Design / Research methods: The author provides his own reflections and opinions, based on the discussions at the workshop. Conclusions / findings: It is very difficult to create a set of indicators making campus sustainability internationally comparable, as well as finding proper sources of information. A starting point in creating such indicators may be mistakes threatening organizational viability and external sustainability Originality / value of the article: The article provides critical feedback on an innovative approach towards research on campus sustainability. </jats:p
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Session B6: Hydraulic Design of an Innovative Baffle-Brush Type Fish Pass
No full textPresenting Author Bio: Dr. Serhat Kucukali completed his MSc and PhD degrees in Hyraulic Engineering at the Istanbul Technical University. He was a Post-doc fellow in the Civil Engineering Department of University of Queensland in Australia. He has published more than 40 research papers and his work was cited over 200 times. He has been conducting research on hydropower, environmental hydraulics, and sustainability. He developed an Environmental Risk Index for Small Hydropower Plants.Abstract: The flow characteristics (depth, velocity, energy dissipation) of a new baffle-brush type fish pass were investigated experimentally in a 2 m wide rectangular flume which has a bed slope of 4% for discharges ranging between100-550 L/s. In all experiments quasi-uniform and subcritical flow conditions, Froude number ranging between 0.17-0.23, were observed. The Darcy-Weisbach friction factor was negatively correlated with the relative submergence of the baffle. The turbulence intensities were ranged between %38-79 in the baffle zone and %13-31 in the brush zone. The hydraulic test results showed that this type of fish pass can produce adequate flow depth and favorable local flow velocities for the design discharge of 0.2 m2/s (relative submergence of brushes=1.03). The hydraulic test results reveal that baffle-brush fish pass fulfill the requirements of an efficient fish passage by providing tranquil flows and sufficient flow depths for different fish species. Consequently, the following design procedure can be used for the proposed baffle-brush fish pass: (i) required flow depth can be specified for the target fish species, (ii) the friction factor can be estimated based on the relative submergence of baffle, and (iii) for the given bed slope, average flow velocity and discharge values can be computed from Darcy-Weisbach formula. The main advantage of the proposed hydraulic design is that we can scale-up all the parts of this type in order to adjust it to almost any demand based on the model test results
A simulation study for determination of refractive index dispersion of dielectric film from reflectance spectrum by using Paul wavelet
No full text32nd International Physics Congress of Turkish-Physical-Society (TPS) -- SEP 06-09, 2016 -- Bodrum, TURKEYIn this work, the Continuous Wavelet Transform (CWT) with Paul wavelet was improved as a tool for determination of refractive index dispersion of dielectric film by using the reflectance spectrum of the film The reflectance spectrum was generated theoretically in the range of 0.8333 - 3.3333 mu m wavenumber and it was analyzed with presented method. Obtained refractive index determined from various resolution of Paul wavelet were compared with the input values, and the importance of the tunable resolution with Paul wavelet was discussed briefly. The noise immunity and uncertainty of the method was also studied.Turkish Phys So
An improved method for determination of refractive index of absorbing films: A simulation study
No full text32nd International Physics Congress of Turkish-Physical-Society (TPS) -- SEP 06-09, 2016 -- Bodrum, TURKEYIn this work an improved version of the method presented by Gandhi was presented for determination of refractive index of absorbing films. In this method local maxima of consecutive interference order in transmittance spectrum are used. The method is based on the minimizing procedure leading to the determination of interference order accurately by using reasonable Cauchy parameters. It was tested on theoretically generated transmittance spectrum of absorbing film and the details of the minimization procedure were discussed.Turkish Phys So
Conducting Democratic Evaluations where Democratic Principles are not always Practiced
No full textBackground: Turkey is a fast-developing country facing a lot of different problems. One of the problems is inadequate education. A large project was started to improve Turkish elementary education. The project includes many different purposes from physical refurbishment of school buildings, to increasing technology use in education. The author of this paper carried out a democratic study to evaluate this project. This article reports on what was learned from this evaluation study conducted in Turkey. Purpose: The purpose of this article is to examine how democratic evaluations can be used to help understand the complex realities where undemocratic ideology has a long history. Setting: This evaluation study was conducted in an elementary school from a lower-middle class neighborhood
Augmented reality goggles selection by using neutrosophic MULTIMOORA method
No full textPurposeThe purpose of this paper is to present the augmented reality (AR) eyeglass selection problem based on Neutrosophic MULTIMOORA method which is a very new multi-objective method.Design/methodology/approachThe author evaluates five AR goggles according to six different criteria. Criteria have different weights and determined by analytic hierarchy process. The author used neutrosophic MULTIMOORA method in order to evaluate AR eyeglasses.FindingsFive different AR eyeglasses were evaluated and the best one was selected according to six different criteria (benefit and non-benefit). According to Neutrosophic MULTIMOORA method, Sony AR eyeglass is selected as the best one. Neutrosophic MULTIMOORA method uses simple computational equations and it handles multi-objective decision making problems effectively.Originality/valueEvaluating AR goggles by using the Neutrosophic MULTIMOORA method for the first time is the originality of this paper.</jats:sec
Bursa koşullarında kısıntılı sulanan patatesin su–verim ilişkisi
No full textBu çalışma, Uludağ Üniversitesi Fen Bilimleri Enstitüsünde Abdurrahim Korukçu'un danışmanlığında Serhat Ayas tarafından hazırlanan "Water-yield relationships in deficit irrigated potato" adlı doktora tezine dayanılarak hazırlanmıştır.This study was conducted in Yenişehir, Bursa between 2004 and 2005 so as to investigate the effect of water deficiency applied in different growth periods of potato on yield and quality parameters. In this study, ten different irrigation treatments in four different growth periods (vegetative growth, tuber formation, tuber bulking and ripening) of potato plant (Solanum Tuberosum L, Hermes) were formed and the yield and quality parameters obtained from these treatments were evaluated. Depending on the treatments, the amount of irrigation water applied to the plants ranged between 345 and 585 mm in the first year, and between 286 and 485 mm in the second year and plant water consumption varied between 399 and 655 mm in the first year and between 370 and 646 mm in the second year. Yield, average tuber weight, average tuber diameter, average tuber size, tuber dry matter ratio, tuber starch ratio, the number of tubers per plant, the number of main stems per plant, tuber peel ratio, the rate of marketable tuber ratio and plant height values were found statistically significant. In both of the years, the highest levels of yield were obtained as 32.3 t ha-1 and 35.0 t ha-1 in the treatments in which full irrigation was conducted in all growth periods, while the lowest levels of yield were obtained as 12.1 t ha-1 and 10.9 ha-1 in the treatments in which 50% water deficiency was applied in all growth periods respectively. Water- yield relationship factor (ky) was found as 0.909 on average. The highest values of water use efficiency (WUE) and irrigation water use efficiency (IWUE) were obtained as 5.23 and 4.35 respectively only in the treatment in which deficit irrigation was given only in ripening period and full irrigation was applied in the other periods.Bu çalışma; patatesin farklı bitki gelişme dönemlerinde uygulanan su kısıntılarının verim ve kalite parametreleri üzerine etkisini araştırmak amacıyla, 2004 ve 2005 yıllarında Bursa-Yenişehir’de yürütülmüştür. Çalışmada, patates bitkisinin (Solanum Tuberosum L, Hermes) 4 farklı gelişme döneminde (vejetatif gelişme, yumru oluşumu, yumru gelişimi ve olgunlaşma) 10 farklı sulama konusu oluşturulmuş ve bu konulardan elde edilen verim ve kalite parametreleri değerlendirilmiştir. Uygulanan sulama suyu miktarları konulara göre ilk yıl 344.6 ile 584.5 mm, ikinci yıl 285.6 ile 484.5 mm arasında, bitki su tüketimleri ise, ilk yıl 398.5 ile 655.2 mm, ikinci yıl 370.4 ile 646.4 mm arasında değişmiştir. Verim, ortalama yumru ağırlığı, ortalama yumru çapı, ortalama yumru boyu, yumru kuru madde oranı, yumru nişasta oranı, bitki başına yumru adedi, bitki başına ana sap adedi, yumru kabuk oranı, pazarlanabilir yumru oranı, bitki boyu değerleri istatistiksel olarak önemli bulunmuştur. En yüksek verim her iki yılda sırayla 32.29 t ha-1 ve 35.00 t ha-1 ile tüm gelişme dönemlerinde tam sulamanın yapıldığı uygulamadan, en düşük verim 12.10 t ha-1 ve 10.91 ha-1 ile tüm gelişme dönemlerinde% 50 su kısıntısının yapıldığı uygulamadan elde edilmiştir. Su verim ilişkisi faktörü (ky) ortalama 0.909 olarak bulunmuştur. En yüksek su kullanım etkinliği (WUE) ve sulama suyu kullanım etkinliği (IWUE) değerleri sırasıyla 5.23 ve 4.35 ile yalnızca olgunlaşma döneminde su kısıntısının yapıldığı ve diğer dönemlerde tam suyun uygulandığı konudan elde edilmiştir
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