1,102 research outputs found
Democracy Through Learner-Centered Education: a Turkish Perspective
No full textAimed at documenting the problems and constraints confronting learner-centered instruction in Turkey, this article first explains the link between democracy and education and the role of learner-centered instruction in realizing democratic ends. By drawing on John Dewey's ideas and Turkish scholars' perspectives on Turkish education, the article then presents the problems and constraints that pose threats to the implementation of learner-centered instruction in Turkey. The author also explains the problems within the Turkish educational system and teacher education programmes, and the challenges that in-service teachers and students may experience with learner-centered instruction. © Springer Science+Business Media B.V. 2008
Implementation of an embedded system for real-time detection of rotor bar failures in induction motors
No full textIn this work, the implementation of an embedded system for real-time detection of rotor bar failures in induction motor has been realized. The device is a prototype measurement device which can detect broken rotor bars on the field without any additional setup or third-party software. This study has focused to derive a new method from previous studies on diagnosing of rotor failures and developed a microcontroller based embedded measurement device. A new method which is combining Fast Fourier Transform and Grey Relational Analyses to get best diagnosis results has been developed for an embedded system within a compact and low-cost measurement device. Although, there are some computer-based techniques and motor drivers that can detect internal failures of induction motor, there is no such a measurement device that can do all process by itself
Is ionizing radiation a risk factor for anxiety in employees?
No full textKurtar Mansiroglu, Asli/0000-0002-1495-1697; sincer, isa/0000-0003-2399-9585; gunes, yilmaz/0000-0003-3817-851X; COSGUN, MEHMET/0000-0002-6965-7444OBJECTIVE: Workers describe many physical and mental symptoms when working in radiation areas. This study aimed to assess these symptoms in radiation workers using the Beck Anxiety Inventory (BAI). METHODS: A total of 42 radiation workers (22 males and 20 females, mean age 34 +/- 7 years) and 47 control subjects (22 males and 27 females, mean age 31 +/- 8 years) who work in non-radiation areas in the hospital were included in the study. All participants anonymously filled out the Beck Anxiety Inventory (BAI) questionnaire. RESULTS: The demographic data of workers were not significantly different between groups. In the BAI, the dizzy or lightheaded (p =0.01), terrified (p= 0.01), unsteady (p=0.02), heart-pounding and racing (p=0.02) items were significantly higher in the radiation-exposed group compared to the control group. vertical bar The BAI score was also significantly higher in the radiation-exposed group (11.1 +/- 6.8 vs. 8.7 +/- 3.8, p =0.04) CONCLUSION: These results suggest the possibility that radiation may play a role in the psychometric properties of workers. The effects of radiation on the health of employees need to be further investigated and understood
Linkages between American and European Publicly Traded Airline Companies - Evidence Resulting from the Diebold-Yilmaz Method
No full textIn this paper, the author implemented the Diebold and Yilmaz approach to analyse the connectedness between the major American and European publicly traded airline companies. The author calculated the return and volatility spillover index for the whole sample using a dynamic rolling sample analysis. The results show that all airlines are significantly linked but there is a clear division into two markets. It was found that return spillovers are more intensive than volatility spillovers. Moreover, the average connectedness level is higher in the U.S. market for returns as well as for volatility. An increase of connectedness occurred due to the certain events: issues linked with the condition of the global economy and long-term crude oil price changes.W artykule przedstawiono wyniki badania powiązań w świetle metody Diebolda i Yilmaza pomiędzy notowaniami najważniejszych linii lotniczych w Stanach Zjednoczonych i w Europie. Wyznaczono indeks powiązań dla dziennych zwrotów i zmienności dla całej próby oraz w ujęciu dynamicznym. Wyniki badania wskazują, że notowania wszystkich analizowanych linii lotniczych są ze sobą powiązane, ale istnieje wyraźny podział na dwa rynki. Powiązania między rynkiem europejskim a amerykańskim są znacznie słabsze niż efekty zarażania pomiędzy liniami lotniczymi z jednego rynku. Efekty zarażania są silniejsze dla zwrotów niż dla zmienności. Ponadto średni poziom indeksu powiązań jest wyższy w Stanach Zjednoczonych niż w Europie. Na zmiany poziomu powiązań w czasie miały wpływ wydarzenia z otoczenia makroekonomicznego i rynku kapitałowego oraz długotrwała zmiana poziomu ceny ropy naftowej
Conservation of Selected Churches in the Most Region and Karviná Region and their Significance for Geotourism
No full textAbstractCoal mining in the Czech Republic has left significant marks on the geomorphology of the regions. Simultaneously, it has also affected the lives of people who have lived there for centuries. This article selects two areas, where the consequences of mining are pronounced. It compares the open cast mining in the brown coal deposit in Most and the underground mining of hard coal in the Karviná Region. Only few monuments have survived out of the original buildings. Certain landmarks are the churches that appear in both of the localities. In Most the original church was relocated by almost one kilometre to another place. The Karviná Region has several churches that have tilted due to mining subsidence. The buildings are the witnesses of the original settlements and suitable destinations for tourists. Overall, the areas have high potentials for the development of non-traditional forms of tourism, especially geo-montane tourism
A Study on the Performance of GPR for Detection of Different Types of Buried Objects
No full textAbstractThe objective of this research is to evaluate the applicability of Ground Penetrating Radar (GPR) method to detect burried objects in the shallow depths using 250 MHz and 800 MHz center frequency antennas. For this purpose, different objects were burried in several places of a certain test site. GPR data were collected along six paralel profiles using 250 MHz and 800 MHz antennas which are compatible with RAMAC CU II system. The reflections profile data were processed using the computer program ReflexW. After the processing of data, the reflected /scattered reflections on the processed radargrams were examined and the radargrams were interpreted to determine the depths and positions of the objects from the surface. Also, the data obtained from 250 and 800 MHz antennas were compared and the differences between them in terms of resolution were discussed
Churches Influenced by Underground Mining in the Karvina Region Used for the Purposes of Geotourism
No full textAbstractThe article aims to point out the mutual relations between underground mining and its manifestations on the ground surface. For the purpose, churches in the Karviná Region were selected. The buildings have been affected by over 200-year long extraction of hard coal. Some of the buildings have been influenced from the start of the mining activities, others later on. Thanks to the combined effects of the historical significance of the monuments and their diversion from the vertical axis, the buildings have become even more interesting. Moreover, they clearly document how the anthropogenic mining activities influence the built-up area. Some of the buildings have been preserved to date, some had to be demolished, unfortunately. Nowadays, the monuments are becoming significant sites of geotourism interest
Monuments of the Czech Republic on the UNESCO World Heritage Site List and their Significance for Geotourism
No full textAbstractThe article presents the monuments from the Czech Republic enlisted on the UNESCO World Heritage Site List. Each country tries to choose representative sites and monuments that document the structural and architectural development in a given region. Therefore, the Czech Republic carried out an analysis of their monuments. As the Czech Republic has a very rich and expressive history in the very centre of Europe, its history has significantly affected its civil engineering and architecture. It is also a country with a varied geological structure and geomorphology. Today's untraditional forms of tourism, among which we also find geotourism, may thus build on such knowledge and expand the current offer of destinations. Learning about the geological structure is also important in terms of future renovation and reconstruction work. The current list of UNESCO cultural sites will be expanded by further unique sites and buildings. For this reason, it is important to combine knowledge from more specialised disciplines, such as geology and mining science
Forensic Dental Age Estimation Using Modified Deep Learning Neural Network
No full textDental age is one of the most reliable methods to identify an individual’s age. By using dental panoramic radiography (DPR) images, physicians and pathologists in forensic sciences try to establish the chronological age of individuals with no valid legal records or registered patients. The current methods in practice demand intensive labor, time, and qualified experts. The development of deep learning algorithms in the field of medical image processing has improved the sensitivity of predicting truth values while reducing the processing speed of imaging time. This study proposed an automated approach to estimate the forensic ages of individuals ranging in age from 8 to 68 using 1332 DPR images. Initially, experimental analyses were performed with the transfer learning-based models, including InceptionV3, DenseNet201, EfficientNetB4, MobileNetV2, VGG16, and ResNet50V2; and accordingly, the best-performing model, InceptionV3, was modified, and a new neural network model was developed. Reducing the number of the parameters already available in the developed model architecture resulted in a faster and more accurate dental age estimation. The performance metrics of the results attained were as follows: mean absolute error (MAE) was 3.13, root mean square error (RMSE) was 4.77, and correlation coefficient R2 was 87%. It is conceivable to propose the new model as potentially dependable and practical ancillary equipment in forensic sciences and dental medicine
Core Loss Estimation in Electric Machines With Flux-Controlled Core Loss Tester
No full textTsukerman, Igor/0000-0001-8318-3225; Tekgun, Burak/0000-0003-2720-8816; Sozer, Yilmaz/0000-0003-3971-3967The complexity of core loss estimation is a serious challenge in the design of high-efficiency electric machines. Current estimation methods based on the Steinmetz equation and loss separation are not accurate enough, even at the rated conditions. This paper describes a loss estimation technique combining finite-element analysis (FEA) and actual core loss measurements. First, flux density waveforms in various parts of the electric machine are determined using FEA. Second, the same waveforms are generated in a wound toroidal core made of the same material as used in the machine. The loss is measured per unit mass, and then the total motor core loss is calculated by integrating the measured W/kg loss values for predefined sections of the motor. These estimation results are compared with those of the Bertotti method. The proposed procedure is shown to improve the accuracy of loss estimation.ABB US Corporate Research; U.S. National Science Foundation [DMS-1620112]This work was supported by fellowships from ABB US Corporate Research. The work of I. Tsukerman was supported in part by the U.S. National Science Foundation under Grant DMS-1620112. (Corresponding author: Yilmaz Sozer.
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