465 research outputs found
Generation of feasible integer solutions on a massively parallel computer using the feasibility pump
No full textUtku Koç (MEF Author)We present an approach to parallelize generation of feasible mixed integer solutions of mixed integer linear programs in distributed memory high performance computing environments. This approach combines a parallel framework with feasibility pump (FP) as the rounding heuristic. It runs multiple FP instances with different starting solutions concurrently, while allowing them to share information. Our computational results suggest that the improvement resulting from parallelization using our approach is statistically significant. (C) 2017 Elsevier B.V. All rights reserved.WOS:0004182168000232-s2.0-85032474890Science Citation Index ExpandedArticleUluslararası işbirliği ile yapılan - EVETKasımYÖK - 2017-1
Phase-Coded FMCW PARSAX Radar Dataset
No full textDataset collected with the TU Delft PARSAX S-band coherent radar using the frequency-modulated continuous-wave (FMCW) and Phase-coded FMCW waveforms. This dataset accompanies the PhD dissertation of Utku Kumbul entitled: "Phase-coded FMCW for automotive radars".
More details about the PARSAX radar used in the measurements can be seen in: O. A. Krasnov, L. P. Ligthart, Zhijian Li, P. Lys and F. van der Zwan, "The PARSAX - full polarimetric FMCW radar with dual-orthogonal signals," 2008 European Radar Conference, 2008, pp. 84-87.
Referencing the dataset
Kumbul, Utku; Petrov, Nikita; van der Zwan, Fred (2022): Phase-Coded FMCW PARSAX Radar Dataset. 4TU.ResearchData. Dataset. https://doi.org/10.4121/21688928
@misc{Kumbul2022,
author = "Utku Kumbul and Nikita Petrov and Fred van der Zwan",
title = "{Phase-Coded FMCW PARSAX Radar Dataset}",
year = "2022",
month = "Dec",
url = "",
doi = "10.4121/21688928 " }
Paper references are:
U. Kumbul, N. Petrov, F. van der Zwan, C. S. Vaucher and A. Yarovoy, "Experimental Investigation of Phase Coded FMCW for Sensing and Communications," 2021 15th European Conference on Antennas and Propagation (EuCAP), 2021, pp. 1-5, doi: 10.23919/EuCAP51087.2021.9411464.
U. Kumbul, N. Petrov, C. S. Vaucher and A. Yarovoy, "Receiver Structures for Phase Modulated FMCW Radars," 2022 16th European Conference on Antennas and Propagation (EuCAP), 2022, pp. 1-5, doi: 10.23919/EuCAP53622.2022.9769268.
U. Kumbul, N. Petrov, C. S. Vaucher and A. Yarovoy, "Smoothed Phase-Coded FMCW: Waveform Properties and Transceiver Architecture," in IEEE Transactions on Aerospace and Electronic Systems, 2022, doi: 10.1109/TAES.2022.3206173. </p
Abuse of the right to access ICSID arbitration
No full textIn the last decade, the Tribunals of the International Centre for the Settlement of Investment Disputes (ICSID) have discussed the adoption of a new standard in assessing the jurisdictional requirements of the Convention on the Settlement of Investment Disputes between States and Nationals of Other States, in order to preserve the integrity of their own process, by introducing the general principle of the abuse of rights into the initiation of the ICSID arbitration process. This well-known principle of international law, along with other similar concepts such as good faith and abuse of process, has begun to play an important role at the jurisdictional stage of ICSID proceedings, largely due to the widely adopted practice of treaty shopping by investors who restructure their investments in order to gain access to the jurisdiction of ICSID tribunals. Although the exact parameters of the principle are not yet established, the practices of ICSID tribunals provide a useful road map for future cases. © The Author 2014. Published by Oxford University Press on behalf of ICSID. All rights reserved
CADASIL syndrome in a large Turkish kindred caused by the R90C mutation in the Notch3 receptor
No full textMutations in the Notch3 gene are the cause of the autosomal dominant disorder CADASIL (cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy). The CADASIL is an adult-onset neurologic disorder (average age of onset is 45 years) characterized by recurrent strokes and dementia. Clinical features combined with cerebral magnetic resonance imaging (MRI), showing a diffuse leukoencephalopathy with subcortical infarcts in the basal ganglia and white matter, are highly contributive to the diagnosis. We present a Turkish family with CADASIL, in which 12 individuals in four generations were affected showing the typical clinical features of recurrent strokes. Mutation analysis of the Notch3 receptor gene identified the recently described R90C mutation in the N-terminal part of the gene in affected individuals. Interestingly, migraine without aura was found as an initial symptom of the disease in two young mutation carriers (22 and 25 years, respectively), who did not show any additional clinical features or any MRI abnormalities. This indicates that migraine without aura in the absence of MRI abnormalities may represent an early initial symptom of CADASIL, which is difficult to diagnose in the absence of molecular diagnosis. Therefore, the used molecular screening method for Notch3 mutations provides a rapid and accurate diagnostic tool in addition to the standard diagnostic procedures
Unlocking the insights: data-analytic examinations of social signals in organizational practices
No full textUsing analytics to understand social data is an emerging research field across different academic disciplines including Information Systems. Information Systems (IS) discipline places the social media-related research at the intersection of people, organizations, and technology. While the recent focus of design science utilizes advanced data mining methods to develop decision-aiding frameworks and extend organizational boundaries by designing novel artifacts; the behavioral focus develops and tests theories that elucidate behaviors at the individual or organizational levels. This thesis comprises three essays aiming to contribute to IS research by both leveraging from the two foundational principles of IS -behavioral science and design science- and applying advanced analytics to further understand the executive, stakeholder, and brand relations. These implementations allow us to elegantly capture several important features of the social signals that have been employed in online networking platforms. In the first two chapters, social signals are examined as internal and external associations of the executives’ career outcomes. The third chapter investigates the social signals from brands’ perspectives. While the first two chapters highlight and examine the relationships of several constructs, the main emphasis of the third chapter lies on designing a valuable information systems tool to complement the theoretical studies and enhance the practical implementations.Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2019-05-01The student, Utku Pamuksuz, accepted the attached license on 2017-04-20 at 11:08.The student, Utku Pamuksuz, submitted this Dissertation for approval on 2017-04-20 at 11:19.This Dissertation was approved for publication on 2017-04-21 at 09:23.DSpace SAF Submission Ingestion Package generated from Vireo submission #10931 on 2017-08-10 at 14:32:20Made available in DSpace on 2017-08-10T19:52:18Z (GMT). No. of bitstreams: 2
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Coordination of inbound and outbound transportation schedules with the production schedule
No full textThis paper studies the coordination of production and shipment schedules for a single stage in the supply chain. The production scheduling problem at the facility is modeled as belonging to a single process. Jobs that are located at a distant origin are carried to this facility making use of a finite number of capacitated vehicles. These vehicles, which are initially stationed close to the origin, are also used for the return of the jobs upon completion of their processing. In the paper, a model is developed to find the schedules of the facility and the vehicles jointly, allowing for effective utilization of the vehicles both in the inbound and the outbound. The objective of the proposed model is to minimize the sum of transportation costs and inventory holding costs. Issues related to transportation such as travel times, vehicle capacities, and waiting limits are explicitly accounted for. Inventories of the unprocessed and processed jobs at the facility are penalized. The paper contributes to the literature on supply chain scheduling under transportation considerations by modeling a practically motivated problem, proving that it is strongly NP-Hard, and developing an analytical and a numerical investigation for its solution. In particular, properties of the solution space are explored, lower bounds are developed on the optimal costs of the general and the special cases, and a computationally-efficient heuristic is proposed for solving large-size instances. The qualities of the heuristic and the lower bounds are demonstrated over an extensive numerical analysis
Limitations of the spike-triggered averaging for estimating motor unit twitch force: a theoretical analysis.
No full textContractile properties of human motor units provide information on the force capacity and fatigability of muscles. The spike-triggered averaging technique (STA) is a conventional method used to estimate the twitch waveform of single motor units in vivo by averaging the joint force signal. Several limitations of this technique have been previously discussed in an empirical way, using simulated and experimental data. In this study, we provide a theoretical analysis of this technique in the frequency domain and describe its intrinsic limitations. By analyzing the analytical expression of STA, first we show that a certain degree of correlation between the motor unit activities prevents an accurate estimation of the twitch force, even from relatively long recordings. Second, we show that the quality of the twitch estimates by STA is highly related to the relative variability of the inter-spike intervals of motor unit action potentials. Interestingly, if this variability is extremely high, correct estimates could be obtained even for high discharge rates. However, for physiological inter-spike interval variability and discharge rate, the technique performs with relatively low estimation accuracy and high estimation variance. Finally, we show that the selection of the triggers that are most distant from the previous and next, which is often suggested, is not an effective way for improving STA estimates and in some cases can even be detrimental. These results show the intrinsic limitations of the STA technique and provide a theoretical framework for the design of new methods for the measurement of motor unit force twitch
Geology, geochemistry, geochronology and genesis of the late Miocene porphyry Cu-Au-Mo mineralization at Afyon-Sandıklı (AS) prospect, western Anatolia, Turkey
No full textAfyon-Sandıklı ‘AS’ is an example of a porphyry Cu-Au-Mo systems hosted in post-collisional late Miocene magmatic rocks within the Afyon-Ören Zone of Turkey. The systems were generated by multi-phase intrusions emplaced into early stage volcanic and volcanoclastic rocks of the Afyon volcanics. The REE and radiogenic isotope data from these rocks suggest a magma source containing residual garnet with a low hydrous phase. These collectively, favor a metasomatized mantle source for magmas generated in either subduction or post-collisional environments. Four main alteration types have been identified in the AS porphyry Cu prospect; potassic, phyllic, epidote-chlorite and advanced argillic. The alteration zones are centered around monzonite porphyry intrusives. Chalcopyrite and bornite are the main copper minerals in the potassic alteration zone with subordinate molybdenite. All are replaced by pyrite. The U-Pb SHRIMP analyses on a post-mineral micromonzonite porphyry dike yielded an age of 10.97 ± 0.09 Ma, whereas the host monzonite porphyry yielded an age range between 10.5 and 12.5 Ma. Ar-Ar geochronology on alunite constrains the timing of the argillic alteration at 11.2 ± 0.5 Ma. Fluid inclusion studies were performed on primary inclusions in quartz veins from the potassic and phyllic alteration zones. The primary fluid inclusions in quartz veins in both zones were classified as Type 1, single-phase vapor (V); Type 2, two-phase liquid-vapor (L-V); and Type 3, three-phase liquid-vapor-solid (L-V-S). Type 3 inclusions in the potassic alteration zone with weak phyllic overprint have higher homogenization temperatures compared to those in pervasive phyllic alteration zones. The majority group of fluid inclusions in the AS prospect are Type 2 inclusions with variable vapor and liquid abundances. This suggests boiling (phase separation) of the hydrothermal fluids, and post boiling trapping of the vapor and liquid. The presence of abundant multiphase (Type 3) inclusions in the AS prospect marks the stage when phase separation took place. The phase separation appears to have resulted in intermediate to high-salinity multiphase brines and daughter crystals in the residual fluid. Additionally, we suggest that superposition of phyllic and potassic alteration zones with a variety of Type 2 and Type 3 inclusions in the AS prospect should mark the stage at which mixing by relatively cooler and dilute meteoric water coupled with phase separation occurred. The calculated ?18O(fluid) vs ?D(fluid) values for the alteration minerals display a wide range between the primary magmatic field to the meteoric water line. The ?18O(fluid) vs ?D(fluid) values for biotite suggest a strong magmatic water influence during the formation of potassic alteration. Likewise, a very narrow range of ?34S, close to the sulfur isotope values of magmatic sulfur indicate a magmatic source, and may suggest that potassic alteration was caused by a uniform magmatic fluid source. Additionally, the enrichment in the ?D(fluid) from biotite suggests that phase separation (boiling) was also active during potassic alteration. The overlapping pattern of the ?18O(fluid) vs ?D(fluid) compositions for biotite and sericite indicate an isotopic similarity, and may suggest that they have been formed from a similar, predominantly magmatic fluid mixed to some degree with the meteoric water. © 2020 Elsevier B.V.15/066We wish to extent our gratitude to Eldorado Gold- Tüprag Metal Madencilik for logistic support for the field work of this study. We also thank to Muğla Sıtkı Koçman University for providing access to clay separation lab. Thanks also goes to Asst. Prof. Ceren Küçükuysal for her guidance in sericite mineral separation study at Muğla Sıtkı Koçman University. Zehra Deveci Aral ( Middle East Technical University – General Directorate of Mineral Research and Exploration) and Mustafa Erde Bilir (Muğla Sıtkı Koçman University) are both thanked for their assistance during zircon mineral separation and U/Pb data evaluation. The geochronological studies of this studies was funded by Muğla Sıtkı Koçman University Scientific Research Project Foundation (BAP, Project No. 15/066). Göksu Uslular is thanked for organizing the figures. Ali Aluç also deserves many thanks for helping accommodation in Muğla. We express our gratitude to David Alan Bickford for English polishing of the manuscript, and for proper English language, grammar, punctuation, spelling, and overall style. The associated editor Prof. İbrahim Uysal, Panagiotis Voudouris and anonymous reviewer contributed much for the improvement of the previous manuscript.Gündoğan, İ., Helvacı, C., Güngör, T., Özerler, M., Öztürk, Y. Y., Karamanderesi, İ. H., 2009. The Genetic Relationships Between Mineralogy of Hydrothermal Alterations and Neogene Volcanic Rocks Around Afyon Sandıklı Region [In Turkish with English abstract), Tübitak Research Project: grant number 106Y153, p. 221
Bir çağdaş anlatım dili olarak romanda görsellik: ‘’Araba Sevdası’ndan Yüksek Topuklar’a’’
No full textSoyadı:Ayşegül Utku Günaydın letişim Bilimleri letişim Bilimleri Prof. Dr. Nurçay Türkoğlu Tez Türü ve Tarihi:Yüksek Lisans - Temmuz 2003 Roman, İmge, GörsellikBİR ÇAĞDAŞ ANLATIM DİLİ OLARAK ROMANDA GÖRSELLİK: ARABA SEVDASI'NDAN YÜKSEK TOPUKLAR'A Çağımızda, görsel kültürün ve görselliğin etkilerini her alanda görmekteyiz. Bunda iletişim konusunda her türlü teknolojinin hızla gelişmesinin de büyük payı bulunmaktadır. Görüntü, görsel dünya, hızla tüm sanat dallarını, toplumsal yaşayışı ve kültürleri etkilemiştir. Edebiyat ise görselliği zihinsel imgelem sürecinde, yazı aracılığıyla işletir. Roman imgeye ve kurguya dayalı, insanı konu alan bir edebiyat ürünüdür. Bu çalışma ile gündelik yaşamda değişen davranış kalıplarının, imajların romanda yazarın imgeleriyle yeniden yaratılması ve okuyucunun kendi imgelerini de katarak eseri alımlaması ve çoğaltma sürecinde, romandaki görsellik incelenmiştir. Çalışmaya örneklem olarak da iki farklı dönemin romanları ele alınmıştır. Bu da Türk edebiyatının ilk roman ürünlerinin verildiği ve çağdaş edebiyata geçiş süreçlerinin yaşandığı Tanzimat edebiyatının en önemli eserlerinden Recaizade Mahmut Ekrem'in Araba Sevdası romanı ile, 2000'li yıllarda yazılmış ve popülerlik kazanmış Murathan Mungan'ın Yüksek Topuklar adlı romanı arasındaki anlatım dilinin görselliğinin ne boyutlarda değiştiğinin bir göstergesi olacaktır Name and Surname:Ayşegül Utku Günaydın Field:Communication Science Programme:Communication Science Supervisor:Proffessor Nurçay Türkoğlu Degree Awarded and Date:Master - July 2003 Novel, İmage, Visuality ABSTRACT THE VISUALITY IN THE NOVEL AS A CONTEMPORARY EXPRESSION LANGUAGE (METHOD): FROM ARABA SEVDASI TO YÜKSEK TOPUKLAR The impacts of visual culture and visuality can be seen in almost every aspect of life. The technological innovations in the field of communication play a crucial role in this fact. The image and the visual world has been effecting all kinds of art, social life and culture. On the other hand literature makes use of visuality in the process of imagination through the use of writing. The novel is a literary product which focuses on human being and depends on imagination. In this study the visuality in the novel is examined through the analysis of the recreation of changing behaviors and images by the author together with the reader's perception and augmentation process. For this purpose two novels from two different periods has been selected, namely Araba Sevdası by Recaizade Mahmut Ekrem and Yüksek Topuklar by Murathan Mungan. The first one is counted for being one of the earliest works in the Turkish Literature representing both the characteristics of the transition to the contemporary literature and the Tanzimat period. The latter is dating from 2000's and a popular one which constitutes a good example for how the dimension of the visuality of the expression language (method) has changed
An efficient numerical treatment for the asymptotic behaviour of the nonlinear Airy-type problems
No full textSEYDAOGLU, MUAZ/0000-0003-3211-0864; Kocak, Huseyin/0000-0001-9683-6096; Erdogan, Utku/0000-0003-0089-0114This study focuses on symplectic integrators for numerical evaluation of the asymptotic solutions of the nonlinear Airy-type equations obtained by reducing the nonlinear dispersive equations. Since the nature of Airy-type equations has both highly oscillatory slow decay and exponential fast decay, most of classical integrators are not able to correctly exhibit challenging physical behaviour. We use specially designed symplectic integrators combining splitting methods with Magnus integrators to catch asymptotic behaviour of nonlinear Airy-type equations efficiently, even for large step sizes. Efficiency of the proposed methods for given problems is discussed. Moreover, numerical results obtained by the proposed methods are compared with the existing results in the literature. (C) 2020 Elsevier B.V. All rights reserved
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