Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection

Permanent URI for this collectionhttps://hdl.handle.net/11147/7148

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Now showing 1 - 20 of 476

Citation - WoS: 3
Citation - Scopus: 3
1/F Noise in Amorphous Silicon and Silicon-Germanium Alloys
(SPIE, 2003) Johanson, Robert E.; Güneş, Mehmet; Güneş, Mehmet; Kasap, Safa O.; 04.05. Department of Pyhsics; 04. Faculty of Science; 01. Izmir Institute of Technology
We report measurements of conductance noise of a-Si1-XGeX:H in two different geometries; one where the current flow is transverse to the surface and the other longitudinal to it. Because of the large increase in sample resistance in going from transverse to longitudinal conduction, it was not possible to measure both geometries at the same temperature. However, the temperature trends are compatible with a common noise source. For both geometries, alloying with up to 40% Ge reduces the noise magnitude by a factor of 50 over that found in a-Si:H
3d Modeling of a Historical Mine Waste Site Using Uav Images: Estimation of Stockpile Volumes
(Springer, 2023) Önal, Okan; Gündüz, Orhan; Gündüz, Orhan; 03.07. Department of Environmental Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
In recent decades, the use of Unmanned Aerial Vehicles (UAV) for land surveying became very popular because of their simplicity and low cost. Aerial images of the site can be used for the reconstruction of the site’s 3D digital model. Once proper calibrations are made, these digital models can be used for several purposes including stockpile volume estimation, stability analyses, forensic engineering and archiving, etc. In this study, the 3D model of an abandoned historical mine waste disposal site located in Balıkesir-Turkey was reconstructed for the estimation of the waste stockpile volumes. The historical mine site is a facility that was abandoned more than 80 years ago. Mine wastes of different quality were disposed of in and around the site along the hydrologically intermittent creek that passes through the site. No engineered precautions were taken at the site to reduce the environmental impacts and all waste piles were exposed to the natural eroding effect of precipitation and wind. The total amount of the waste volume is not known accurately, which prevents researchers to quantify the potential impacts associated with different waste stockpiles. Thus, a 3D digital model of the site was created by using UAV data obtained from a quadcopter and later processed to obtain a digital topography of the site with an improved accuracy value of ± 2 cm. The stockpiles were later analyzed with geographic information systems to characterize the magnitude of mine wastes and to propose alternative engineering solutions for environmental mitigation. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd 2023.
Citation - Scopus: 4
44 Current Challenges in Mirnomics
(Humana Press, 2022) Akgül, Bünyamin; Allmer, Jens; Stadler, Peter F.; Akgül, Bünyamin; Hawkins, Liam J.; Hadj-Moussa, Hanane; Storey, Kenneth B.; Ergin, Kemal; Allmer, Jens; 04.03. Department of Molecular Biology and Genetics; 04. Faculty of Science; 01. Izmir Institute of Technology
Mature microRNAs (miRNAs) are short RNA sequences about 18–24 nucleotide long, which provide the recognition key within RISC for the posttranscriptional regulation of target RNAs. Considering the canonical pathway, mature miRNAs are produced via a multistep process. Their transcription (pri-miRNAs) and first processing step via the microprocessor complex (pre-miRNAs) occur in the nucleus. Then they are exported into the cytosol, processed again by Dicer (dsRNA) and finally a single strand (mature miRNA) is incorporated into RISC (miRISC). The sequence of the incorporated miRNA provides the function of RNA target recognition via hybridization. Following binding of the target, the mRNA is either degraded or translation is inhibited, which ultimately leads to less protein production. Conversely, it has been shown that binding within the 5? UTR of the mRNA can lead to an increase in protein product. Regulation of homeostasis is very important for a cell; therefore, all steps in the miRNA-based regulation pathway, from transcription to the incorporation of the mature miRNA into RISC, are under tight control. While much research effort has been exerted in this area, the knowledgebase is not sufficient for accurately modelling miRNA regulation computationally. The computational prediction of miRNAs is, however, necessary because it is not feasible to investigate all possible pairs of a miRNA and its target, let alone miRNAs and their targets. We here point out open challenges important for computational modelling or for our general understanding of miRNA-based regulation and show how their investigation is beneficial. It is our hope that this collection of challenges will lead to their resolution in the near future. © 2022, Springer Science+Business Media, LLC, part of Springer Nature.
Citation - WoS: 1
Citation - Scopus: 1
Accounting for Product Similarity in Software Project Duration Estimation
(World Scientific Publishing Co. Pte Ltd, 2016-02-01) Taştekin, Semra Yılmaz; Erten, Yusuf Murat; Erten, Yusuf Murat; Bilgen, Semih; 03.04. Department of Computer Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
We extend an existing model proposed for estimating project duration for industrial projects in general, to software intensive systems projects. We show, through nine different cases studies from different sectors, that product similarity, measured in terms of requirements reuse, can be incorporated into that model to improve its applicability in software intensive systems projects.
Citation - WoS: 3
Citation - Scopus: 3
Acid-Derived Bacterial Cellulose Nanocrystals as Organic Filler for the Generation of High-Oxygen Barrier Bio-Nanocomposite Coatings
(Royal Soc Chemistry, 2023) Carullo, Daniele; Büyüktaş, Duygu; Rovera, Cesare; Bellesia, Tommaso; Büyüktaş, Duygu; Ghaani, Masoud; Santo, Nadia; Farris, Stefano; 03.08. Department of Food Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
Macro-sized bacterial cellulose (BC) derived from Komagataeibacter sucrofermentans was down-sized into nanocrystals (BCNCs) through hydrochloric acid (H-BCNCs) and sulfuric acid (S-BCNCs) hydrolysis. Initially, aqueous dispersions of BCNCs were analyzed for stability, size/morphology, and optical/mechanical properties. Subsequently, BCNCs were incorporated into a main biopolymer phase (i.e., pullulan) to create bio-nanocomposite coatings with high-oxygen barrier performance. Upon treatment with sulfuric acid, nano-sized particles (approximate to 240 nm) were observed, contrasting with significantly larger sizes (approximate to 1.8 mu m) seen for particles obtained using hydrochloric acid. Microscopy analyses revealed a needle-like morphology of the nanocrystals, which appeared organized in stacks for H-BCNCs or as individual units for S-BCNCs. Pullulan/BCNCs coatings applied to polyethylene-terephthalate (PET) films improved the gas barrier performance of the original substrate, by dramatically reducing the oxygen transmission rate (OTR) values from approximate to 120 cm3 m-2 24 h-1 to approximate to 2 cm3 m-2 24 h-1 while preserving its original optical and mechanical properties. Our developed bionanocomposite-coated PET films hold potential as an alternative material for various food packaging applications. This study investigates the effect of the hydrolysis process on bacterial cellulose (BC) to obtain bacterial cellulose nanocrystals (BCNCs) used to create high oxygen barrier nanocomposite coatings for food packaging applications.
Citation - WoS: 7
Citation - Scopus: 9
Adaptive Control Non-Linear Teleoperator Systems in the Presence of Additive Input and Output Disturbances
(ACTA Press, 2010) Tatlıcıoğlu, Enver; Tatlıcıoğlu, Enver; 03.05. Department of Electrical and Electronics Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
In this paper, a robust adaptive controller is developed for nonlinear teleoperator systems. The controller is proven to yield semi-global asymptotic tracking in the presence of additive disturbances and parametric uncertainty. Robust integral of the sign of the error terms are utilized in the design of the controller and Lyapunov-based techniques are used to guarantee that the coordination between the master and the slave systems is ensured and the tracking error is asymptotically driven to zero.
Citation - Scopus: 9
Adaptive Rtp Rate Control Method
(Institute of Electrical and Electronics Engineers Inc., 2011-10) Tos, Uras; Ayav, Tolga; Ayav, Tolga; 03.04. Department of Computer Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
In this paper, we present an adaptive method for maximizing network bandwidth utilization for the real-time applications. RTP protocol is chosen as the transport protocol and the network utilization is provided by increasing and decreasing the transmission rate of the RTP traffic. Our method employs a PID controller that keeps the RTP packet loss fraction at a predefined reference point. Packet loss fraction parameter is gathered from the RTCP receiver reports and fed into the PID controller that controls the transmission rate of the RTP traffic. Simulations are performed to demonstrate the effectiveness of the method under a bottleneck network configuration with background UDP traffic competing against the RTP traffic for the available bandwidth.
Citation - WoS: 4
Citation - Scopus: 4
Adaptive Visual Servo Regulation Control for Camera-In Configuration With a Fixed Camera Extension
(ACTA Press, 2009) Tatlıcıoğlu, Enver; Tatlıcıoğlu, Enver; Dawson, Darren M.; Xian, B.; 03.05. Department of Electrical and Electronics Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
In this paper, image-based regulation control of a robot manipulator with an uncalibrated vision system is discussed. To compensate for the unknown camera calibration parameters, a novel prediction error formulation is presented. To achieve the control objectives, a Lyapunov-based adaptive control strategy is employed. The control development for the camera-in-hand problem is presented in detail and a fixed-camera problem is included as an extension.
Adoption Factors of Electronic Health Record Systems
(Springer, 2016) Kök,O.M.; Başoğlu, Ahmet Nuri; Başoğlu, Ahmet Nuri; Daim,T.U.; 02.04. Department of Industrial Design; 02. Faculty of Architecture; 01. Izmir Institute of Technology
Today’s rapidly changing regulations, increasing healthcare costs, and most importantly globalization have made health record keeping an important issue. Electronic health record systems are rising as a crucial and unavoidable way of record keeping for healthcare. However, as other information technology implementations, electronic health records also have their own adoption processes and diffusion factors. The main goal of this study is to define a model to analyze the adoption process of electronic health record systems and to understand the diffusion factors. © 2016, Springer International Publishing Switzerland.
Alteration of Protein Localization and Intracellular Calcium Content Due To Connexin26 D50a and A88v Mutations
(Türk Biyokimya Derneği, 2017-04) Aypek, Hande; Meşe Özçivici, Gülistan; Meşe, Gülistan; Meşe Özçivici, Gülistan; 04.03. Department of Molecular Biology and Genetics; 04. Faculty of Science; 01. Izmir Institute of Technology
Introduction: Connexins (Cx) play essential roles in cellular homeostasis by forming gap junctions and non-junctional hemichannels. In vitro characterization of Cx26 mutations causing keratitis-ichthyosis-deafness (KID) syndrome, were shown to form leaky hemichannels. The molecular/ cellular mechanisms affected by aberrant hemichannels have recently been elucidated. Here, we further wanted to characterize Cx26 KID syndrome mutations, D50A and A88V, which were shown to form aberrant hemichannels and remained unaddressed in the literature. Methods: Neurobiotin uptake assay in HeLa and N2A cells transfected with Cx26-WT, D50A or A88V verified the presence of aberrant hemichannels and immunofluorescent staining with fluorescent microscopy determined cellular localization of Cx26. Finally, intracellular calcium content was examined by using calcium indicator, Fluo-3AM, and flow cytometer. Results: Cx26-D50A and A88V mutations prevented the formation of gap junction plaques at cell-cell appositions and mutant proteins were observed to localize to the Golgi apparatus. Further, comparison of intracellular calcium content showed an increase in calcium amount in cells containing Cx26-D50A and A88V relative to Cx26-WT. Conclusion: Retention of Cx26 in the Golgi apparatus and alteration in the intracellular calcium content due to KID syndrome mutations may influence various cellular processes that might contribute to development of epidermal phenotypes.
Citation - WoS: 1
Citation - Scopus: 1
Alternating Error Effects on Decomposition Method in Function Generation Synthesis
(Springer Verlag, 2017) Maaroof, Omar W.; Kiper, Gökhan; Dede, Mehmet Ismet Can; Dede, Mehmet İsmet Can; Kiper, Gokhan; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
In approximate function generation synthesis methods, error between the desired function's output and designed mechanism's output oscillate about zero error while crossing the zero error margin at precision points. The common goal of these methods is to minimize the error within the selected working region of the mechanism. For mechanisms like Bennett overconstrained six-revolute jointed linkages that have relatively large number of construction parameters, it is a difficult task to solve for them at once. Decomposition method enables to divide such linkages into two loops and independently solve for each loop with less construction parameters. Although some approximation methods are proven to produce smaller errors than others for a single-loop synthesis, in this work, it is shown that smaller errors are not guaranteed for a certain method when used along with decomposition method. Numerical examples indicate that in decomposition method, more attention should be given to the alternation of the error of each decomposed mechanism, rather than the approximation method used.
Citation - Scopus: 4
Analysis of Design-Driven Innovation Practices in Turkish and Swedish Furniture Firms: an Exploratory Approach
(Common Ground Research Networks, 2019) Aydın, Mahmut Ferit; Erkarslan, Önder; Erkarslan, Önder; 02.04. Department of Industrial Design; 02. Faculty of Architecture; 01. Izmir Institute of Technology
This study explores and analyzes recent design-driven innovation (DDI) practices in the furniture industries in Turkey and Sweden.2 The study was conducted in three phases: an in-depth literature review; the identification and selection of furniture companies; and analysis of the selected companies based on the strategic, operational, market-entry and organizational dimensions. We used case-study methods and conducted semi-structured interviews with designers and design managers of leading furniture companies from Turkey (Nurus, Ersa, Burotime, and Tuna Ofis) and Sweden (Offecct and Skandiform). Through cross-case analysis of national outcomes, we propose additional drivers to DDI theory, such as product segmentation, activity research, culture research and concept/designer research. The results of this study are crucial for all parties involved, as they suggest ways to achieve incremental and radical design-driven innovations. © Common Ground Research Networks, M. Ferit Aydin, Onder Erkarslan, All Rights Reserved.
Citation - Scopus: 1
Analysis of the Logistic Growth Model With Taylor Matrix and Collocation Method
(Etamaths Publishing, 2023) Çelik, Elçin; Çelik, Elçin; Uçar, Deniz; 01. Izmir Institute of Technology
Early analysis of infectious diseases is very important in the spread of the disease. The main aim of this study is to make important predictions and inferences for Covid 19, which is the current epidemic disease, with mathematical modeling and numerical solution methods. So we deal with the logistic growth model. We obtain carrying capacity and growth rate with Turkey epidemic data. The obtained growth rate and carrying capacity is used in the Taylor collocation method. With this method, we estimate and making predictions close to reality with Maple. We also show the estimates made with the help of graphics and tables. © 2023 the author(s).
An Analysis of Visitors’ Perceptions of Shopping Malls †
(MDPI, 2023) Çavka, Hasan Burak; Çavka, Hasan Burak; 02.02. Department of Architecture; 02. Faculty of Architecture; 01. Izmir Institute of Technology
Shopping malls have been a significant part of our daily lives for decades. Their significance is derived from the use of these spaces based on great numbers of people, as well as the role malls play in culture. On the other hand, the design of malls has been constantly evolving according to the needs of users and the market. This study is based on survey data that we collected from ninety visitors of a shopping mall located in Izmir, Turkiye. Through the survey, we collected data on topics such as the participants’ visit frequency and reasons for visiting the mall, architectural and spatial features they favor and/or dislike, their opinions on where they perceive malls in everyday life, and their opinions on alternative spaces to malls. The data collection was finalized right before the pandemic, which significantly changed the way we think about public spaces, as well as malls, in relation to architecture. Analyzing collected data provides further insight into surveyed customers’ perception of spaces, the design of shopping malls, the use of the space, the preferred design features, as well as design features that drive customers away from the mall. The analysis was later compared and linked to studies in the literature. These research findings have the potential to be used in studies that evaluate mall design and space use, as well as in studies that compare the post-pandemic perception of spaces and the use of shopping malls. © 2023 by the author.
Ancient Places of Performance as “realms of Memory”. the Case of Greece
(Editura Universitara Ion Mincu, 2023) Aktüre, Z.; Aktüre, Zeynep; 02.02. Department of Architecture; 02. Faculty of Architecture; 01. Izmir Institute of Technology
Citation - Scopus: 3
Android Uygulaması Testi için İdeal Test Ön Çalışması
(CEUR Workshop Proceedings, 2018) Mercan, Gizem; Belli, Fevzi; Akgündüz, Evrim; Kılınççeker, Onur; Challenger, Moharram; Belli, Fevzi; 03.04. Department of Computer Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
This paper proposes a hybrid method combining well-known holistic test and mutation testing in software testing for Graphical User Interface (GUI) testing of an android application. Moreover, this hybrid method satisfies requirements of ideal testing that is well known and important in software testing. Presence and absence of GUI based faults are tested within this work experimentally and comparatively in the scale of given or constructed model. First step of the method is modeling the given GUI of android application by Finite State Machine (FSM) and then converting this FSM to Regular Expression (RE). Then, test sequences are generated from a context table that is obtained analysis of the RE model. This process defines first part of the Holistic Testing namely positive testing. In second part called negative testing, the test sequence generation procedure is applied mutants of the FSM obtained after applying selected mutation operators. The generated test sequences from original and mutant models are executed on mutant and original android applications respectively. Test sequences are filtered by using pre-defined selection criteria for both positive and negative testing to achieve ideal test suites that are satisfying requirements of the ideal testing.
Angular Momentum Loss by Magnetic Braking and Gravitational Radiation in Relativistic Binary Stars
(Incoma Ltd, 2008) Yakut,K.; Kalomeni,B.; Tout,C.A.
Angular momentum loss (AML) mechanisms and dynamical evolution owing to magnetic braking and gravitational radiation in relativistic binary stars (RBS) are studied with use of physical parameters collected from the literature. We have calculated and compared AML time scales for the RBS with non-degenerate components and double degenerate (DD) systems. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial- ShareAlike Licence.
Citation - WoS: 2
Citation - Scopus: 1
Angular Momentum Loss in Polars
(Cambridge University Press, 2009-08) Kalomeni, Belinda; Kalomeni, Belinda; 04.05. Department of Pyhsics; 04. Faculty of Science; 01. Izmir Institute of Technology
We discuss the possible angular momentum loss mechanisms in AM Her type cataclysmic variables and their corresponding mass loss rates using the observed physical parameters of them.
Citation - WoS: 1
Citation - Scopus: 1
ANN model predicts floor tile properties
(American Ceramic Society, 2004) Akkurt, Sedat; Akkurt, Sedat; Özcan, Selçuk; 03.09. Department of Materials Science and Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
[No abstract available]
Citation - Scopus: 1
Annealing-Based Model-Free Expectation Maximisation for Multi-Colour Flow Cytometry Data Clustering
(Inderscience Enterprises Ltd., 2016) Köktürk, Başak Esin; Karaçalı, Bilge; Karaçalı, Bilge; 03.05. Department of Electrical and Electronics Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
This paper proposes an optimised model-free expectation maximisation method for automated clustering of high-dimensional datasets. The method is based on a recursive binary division strategy that successively divides an original dataset into distinct clusters. Each binary division is carriedout using a model-free expectation maximisation scheme that exploits the posterior probability computation capability of the quasi-supervised learningalgorithm subjected to a line-search optimisation over the reference set size parameter analogous to a simulated annealing approach. The divisions arecontinued until a division cost exceeds an adaptively determined limit. Experiment results on synthetic as well as real multi-colour flow cytometrydatasets showed that the proposed method can accurately capture the prominent clusters without requiring any prior knowledge on the number of clusters ortheir distribution models.

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