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Koleksiyon [18]
Tam Metin [2]
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Yazar [20]
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Konu Başlıkları [20]
Yayın Dili [1]
Dergi Adı [20]
The effect of project-based learning on students’ statistical literacy levels for data representation

Koparan T. | Güven B.

Makale | 2015 | International Journal of Mathematical Education in Science and Technology46 ( 5 ) , pp.658 - 686

The point of this study is to define the effect of project-based learning approach on 8th Grade secondary-school students’ statistical literacy levels for data representation. To achieve this goal, a test which consists of 12 open-ended questions in accordance with the views of experts was developed. Seventy 8th grade secondary-school students, 35 in the experimental group and 35 in the control group, took this test twice, one before the application and one after the application. All the raw scores were turned into linear points by using the Winsteps 3.72 modelling program that makes the Rasch analysis and t-tests, and an ANCOVA ana . . .lysis was carried out with the linear points. Depending on the findings, it was concluded that the project-based learning approach increases students’ level of statistical literacy for data representation. Students’ levels of statistical literacy before and after the application were shown through the obtained person-item maps. © 2015 Taylor & Francis Daha fazlası Daha az

Fuzzy AHP and fuzzy TOPSIS integrated hybrid method for auxiliary systems of ship main engines

Alarcin F. | Balin A. | Demirel H.

Makale | 2014 | Journal of Marine Engineering and Technology13 ( 1 ) , pp.3 - 11

Although significant technical precautions have been taken in marine diesel engine and auxiliary systems, unexpected failures can be observed during operation. These failures can sometimes lead to irreversible losses. The purpose of the study is to present fuzzy Analytic Hierarchy Process (AHP) and TOPSIS (Technique for Order Preference by Similarity to Ideal Solution) methods that can be applied for failure detection in auxiliary systems and marine diesel engine determined by group of experts. By evaluating the decision-making groups, the system most affected by failures was determined. © 2014 Taylor and Francis Ltd. All rights reserved.

Novel fusion approach on automatic object extraction from spatial data: case study Worldview-2 and TOPO5000

Sefercik U.G. | Karakis S. | Atalay C. | Yigit I. | Gokmen U.

Makale | 2018 | Geocarto International33 ( 10 ) , pp.1139 - 1154

The automatic extraction of information content from remotely sensed data is always challenging. We suggest a novel fusion approach to improve the extraction of this information from mono-satellite images. A Worldview-2 (WV-2) pan-sharpened image and a 1/5000-scaled topographic vector map (TOPO5000) were used as the sample data. Firstly, the buildings and roads were manually extracted from WV-2 to point out the maximum extractable information content. Subsequently, object-based automatic extractions were performed. After achieving two-dimensional results, a normalized digital surface model (nDSM) was generated from the underlying di . . .gital aerial photos of TOPO5000, and the automatic extraction was repeated by fusion with the nDSM to include individual object heights as an additional band for classification. The contribution was tested by precision, completeness and overall quality. Novel fusion technique increased the success of automatic extraction by 7% for the number of buildings and by 23% for the length of roads. © 2017, © 2017 Informa UK Limited, trading as Taylor & Francis Group Daha fazlası Daha az

Information content of optical satellite images for topographic mapping

Topan H. | Maktav D. | Jacobsen K. | Buyuksalih G.

Konferans nesnesi | 2009 | International Journal of Remote Sensing30 ( 7 ) , pp.1819 - 1827

Geometric high-resolution satellite imagery (HRSI) is being used increasingly for generating large-scale topographic maps. The detection of object shapes has become easier and more accurate with improved geometric resolution. The grey value range and spectral resolution are also important for the identification and classification of objects. The nominal ground sampling distance (GSD) must not be the same as the effective GSD corresponding to the information content. In addition, the topographic conditions, object contrast, sun elevation and azimuth and atmospheric conditions influence the object identification. The information conte . . .nt of panchromatic and multispectral satellite images (Landsat 7 ETM+, ASTER, TK-350, KVR-1000, SPOT-5, IRS-1C, IKONOS, QuickBird and OrbView-3) available for the Zonguldak test field were investigated with respect to the generation of large-scale topographic maps. The rule of thumb for topographic mapping of at least 0.1 mm GSD in the map scale with the limit of a maximum of 5 m GSD also for smaller map scales has been confirmed Daha fazlası Daha az

Geometric correction accuracy of different satellite sensor images: Application of figure condition

Sertel E. | Kutoglu S.H. | Kaya S.

Makale | 2007 | International Journal of Remote Sensing28 ( 20 ) , pp.4685 - 4692

In this study, the figure condition method was introduced to analyse the accuracy of geometric correction. Figure condition denotes the transformation ability of estimated model parameters for a given transformation model, and it can be used in a geometric correction procedure. To study the figure condition, multisensor satellite images were geometrically corrected using ground control points obtained by different methods. The accuracy of each geometric model was analysed by means of the root mean square error of unit weight and variance-covariance matrix of unknown parameters. Then, an error propagation law was applied to the geome . . .tric model in order to investigate the transformation ability of the model parameters and estimate error values of geometric correction for the whole image surface. The results of the research demonstrated that the figure condition can be applied to geometric correction, and error values of the whole study area can be obtained with this new approach without using check points Daha fazlası Daha az

Impact of content knowledge on pedagogical content knowledge in the context of cell division

Şen M. | Öztekin C. | Demirdöğen B.

Makale | 2018 | Journal of Science Teacher Education29 ( 2 ) , pp.102 - 127

This study focused on how science teachers’ content knowledge influences their pedagogical content knowledge (PCK) with respect to the topic of cell division. The data were collected from 3 in-service teachers using interviews; observations; and teacher-provided documents, including written-answer exams. The participants’ content knowledge was analyzed by inductive coding with respect to conceptual understanding, whereas their PCK was analyzed by withincase analysis followed by cross-case analysis to show how content knowledge affects PCK. The findings showed that content knowledge may support knowledge of what students understand i . . .n science as well as knowledge of instructional strategies, whereas the impact of content knowledge on teachers’ knowledge of the science curriculum and their knowledge of assessment in science is complicated. Moreover, content knowledge may not have any effect on teachers’ orientations toward teaching science. Implications for science teacher education and research are discussed. © 2018 Association for Science Teacher Education Daha fazlası Daha az

The global asymptotic stability of a system of difference equations

Gümüş M.

Makale | 2018 | Journal of Difference Equations and Applications24 ( 6 ) , pp.976 - 991

This paper deals with the global asymptotic stability of the unique positive equilibrium point and the rate of convergence of positive solutions of the system of two recursive sequences xn+1 = A + (yn-m/yn), yn+1 = A + (xn-m/xn), n = 0, 1, . . ., and m ? Z +, where A ? (0,?), x-i and y-i are arbitrary positive numbers for i = 0, 1, . . . ,m. Also, we present some results about the general behaviour of solutions of aforementioned system. Finally, some numerical examples are given to demonstrate the effectiveness of the results obtained. © 2018, © 2018 Informa UK Limited, trading as Taylor & Francis Group.

On the vertical accuracy of the ALOS world 3D-30m digital elevation model

Caglar B. | Becek K. | Mekik C. | Ozendi M.

Makale | 2018 | Remote Sensing Letters9 ( 6 ) , pp.607 - 615

In this contribution, we assess the vertical accuracy of the Advanced Land Observing Satellite (ALOS) World 3D 30 m (AW3D30) digital elevation model (DEM) using the runway method (RWYM). The RWYM utilizes the longitudinal profiles of runways which are reliable and ubiquitous reference data. A reference dataset used in this project consists of 36 runways located at various points throughout the world. We found that AW3D30 has a remarkably low root mean square error (RMSE) of 1.78 m (one sigma). However, while analysing the results, it has become apparent that it also contains a widespread elevation anomaly. We conclude that this anom . . .aly is the result of uncompensated sensor noise and the data processing algorithm. Also, we note that the traditional accuracy assessment of a DEM does not allow for identification of these type of anomalies in a DEM. © 2018 Informa UK Limited, trading as Taylor & Francis Group Daha fazlası Daha az

Area-based quality control of airborne laser scanning 3D models for different land classes using terrestrial laser scanning: sample survey in Houston, USA

Sefercik U.G. | Glennie C. | Singhania A. | Hauser D.

Makale | 2015 | International Journal of Remote Sensing36 ( 23 ) , pp.5916 - 5934

Airborne laser scanning (ALS) is a remote-sensing technique that provides scale-accurate 3D models consisting of dense point clouds with x, y planimetric coordinates and altitude z. Using ALS, very high-resolution (VHR) digital surface models (DSMs) have been widely used for commercial and scientific applications since the early 1990s. Although there is widespread usage, there has been little comprehensive investigation of quality control for ALS DSMs in the literature, as most studies have been limited to assessing point-based vertical accuracy. This article is dedicated to investigating the quality of ALS DSMs for different land c . . .lasses using statistical and visual approaches based on absolute and relative vertical accuracy metrics. Rather than a limited number of ground control points (GCP), the model-to-model-based approach is applied and DSMs derived from terrestrial laser scanning (TLS) point clouds that have around 5 mm absolute and 3 mm relative geolocation accuracy were used as the reference data for comparison. The results demonstrate that in open, grass, and building land classes, the ALS DSMs reached both standard deviation (?) and normalized median absolute deviation (NMAD) of 3–5 cm after the elimination of any systematic biases. This result sufficiently satisfies the vertical accuracy requirements for 1/1000-scale topographic maps determined by National Digital Elevation Program (NDEP) specifications. In tall vegetation, a higher number of discrepancies larger than 0.5 m exist, reversing the relation between ? and NMAD. These vegetation errors also do not appear to be normally distributed. As an additional investigation, the performance of ALS DEMs under dense high-vegetation areas was assessed. These under-canopy ALS DEMs, created using only classified ground returns, offer both ? and NMAD of 12–14 cm, a performance level that is difficult to achieve under-canopy using photogrammetric techniques. © 2015 Taylor & Francis Daha fazlası Daha az

Effect of Er,Cr:YSGG laser surface conditioning on the adhesion of fiber-reinforced composite and zirconia intraradicular posts to the root dentin

Cengiz S. | Koçak S. | Koçak M. | Velioglu N. | Sadettinoglu K. | Özcan M.

Makale | 2016 | Journal of Adhesion Science and Technology30 ( 18 ) , pp.1957 - 1967

This study evaluated the influence of Er,Cr:YSGG laser surface conditioning on push-out bond strength of different root posts to the root dentin. Extracted (N = 27, n = 9 per group) and endodontically treated human mandibular premolars were prepared to receive the posts. Three types of posts, namely quartz fiber (D), glass fiber (S), and zirconium dioxide post (C) were luted with resin cement. The posts were randomly assigned to one of the surface conditioning method: (a) No conditioning, control (L0), (b) Er,Cr:YSGG laser at 175 mJ, 3.5 W for 60 s (L1), and (c) at 225 mJ, 4.5 W for 60 s, with 60 s pulse duration and repetition rate . . . was 20 Hz (L2) irradiation. Six sections (two coronal, two middle, and two apical) were made in each tooth yielding to 1 mm thick specimens. The specimens were stored in distilled water at 37 °C for 24 h and push-out bond strength (MPa) was tested in a Universal Testing Machine (1 mm/min). Data were analyzed using Kruskall-Wallis and Dunns's post hoc tests (? = 0.05). In group D, both laser treated groups (L1:16.16 ± 19.89; L2:8.24 ± 9.26) presented significantly less bond strength compared to control group (L0:28.3 ± 16.8) (p < 0.001). Mean push-out bond strength values did not significantly differ according to the root segments (coronal, middle, and apical) (p = 0.106). Application of Er,Cr:YSGG laser, with the parameters tested, did not increase the bond strength of zirconium glass fiber and zirconium oxide posts. Laser surface conditioning decreased the bond strength of quartz fiber posts in the root canal. © 2016 Informa UK Limited Daha fazlası Daha az

Comparative evaluation of push-out bond strength of Neo MTA Plus with Biodentine and white ProRoot MTA

Aktemur Türker S. | Uzunoğlu E. | Bilgin B.

Makale | 2017 | Journal of Adhesion Science and Technology31 ( 5 ) , pp.502 - 508

Objective: The aim of this in vitro study was to evaluate the bond strength of a new calcium silicate cement, Neo MTA Plus (Avalon Biomed Inc. Bradenton, FL, U.S.A) by comparing ProRoot MTA and Biodentine. Material and Methods: Sixty dentin slices were instrumented to achieve a diameter of 1.3 mm. Group 1: white ProRoot MTA, group 2: Biodentine, group 3: Neo MTA Plus–G (powder mixed with gel), group 4: Neo MTA Plus–W (powder mixed with distilled water) were loaded into cavities. The push-out bond strength values were measured. Data were analyzed using Welch ANOVA with Bonferroni correction p = 0.05. Failure modes (adhesive, cohesive . . ., and mixture) were analyzed. Results: The highest bond strength value was recorded in Neo MTA Plus mixed with gel (5.23 ± 1.78 MPa), whereas white ProRoot MTA (2.57 ± 0.66 MPa) had the lowest. Bond strength values of Neo MTA Plus mixed either with gel or with distilled water were statistically different from both white ProRoot MTA and Biodentine (2.61 ± 0.70 MPa) (p Daha fazlası Daha az

Non-linear response of the rockfill in a concrete-faced rockfill dam under seismic excitation

Kartal M.E. | Bayraktar A.

Makale | 2015 | Mathematical and Computer Modelling of Dynamical Systems21 ( 1 ) , pp.77 - 101

This study investigates the non-linear response of the rockfill in a concrete-faced rockfill dam under seismic excitation for various concrete slab thicknesses from 30 to 100 cm thick. The effect of the friction in the concrete slab rockfill interface on the non-linear response of the rockfill is also considered in the numerical solutions. The friction contact in the concrete slab joints is provided with contact elements based on the Coulomb’s friction law. The hydrodynamic pressure of the reservoir water is considered by the fluid finite elements based on the Lagrangian approach. Geometrical and material non-linear behaviours of th . . .e dam-foundation-reservoir interaction system are considered together in the finite element analyses. The Drucker–Prager model is used to obtain materially non-linear behaviour of the concrete slab. The multi linear kinematic hardening model is used for rockfill and foundation rock in the material non-linear analyses. Therefore, the uniaxial stress–strain relations of the rockfill and foundation rock are determined from the shear stress–shear strain relations of the gravel and rock, respectively. The principle compressive and tensile stresses of the rockfill are investigated along the horizontal section of the rockfill. According to numerical analyses, the most critical stresses occur in the upstream and downstream faces of the dam for the concrete slab thickness of 30 cm, while the optimum thickness for seismic performance is 58 cm. © 2014, © 2014 Taylor & Francis Daha fazlası Daha az

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