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Permanent URI for this collectionhttps://hdl.handle.net/20.500.14288/3
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Publication Metadata only Hellenistic weights in the İzak Eskinazi Collection(Akdeniz Universitesi - Akdeniz Dillerini ve Kulturlerini Arastirma Merkezi, 2024) Tekin, Oğuz; VPRD-AKMEDThis article discusses 86 weights from the İzak Eskinazi Collection. While some are from outside Anatolia, most belong to cities in Western Anatolia, and their identifications and descriptions have been made possible due to the presence of ethnikon or parasemon. Although attributions could not be made for some weights due to the absence of ethnikon or parasemon, it can still be said that they mostly belong to cities in Western Anatolia. © 2024, Akdeniz Universitesi - Akdeniz Dillerini ve Kulturlerini Arastirma Merkezi. All rights reserved.Publication Metadata only Numerical analysis of multidomain systems: Coupled nonlinear PDEs and DAEs with noise(IEEE-Inst Electrical Electronics Engineers Inc, 2018) Hanay, M. Selim; Department of Electrical and Electronics Engineering; Demir, Alper; Faculty Member; Department of Electrical and Electronics Engineering; College of Engineering; 3756We present a numerical modeling and simulation paradigm for multidomain, multiphysics systems with components modeled both in a lumped and distributed manner. The lumped components are modeled with a system of differential-algebraic equations (DAEs), whereas the possibly nonlinear distributed components that may belong to different physical domains are modeled using partial differential equations (PDEs) with associated boundary conditions. We address a comprehensive suite of problems for nonlinear coupled DAE-PDE systems including 1) transient simulation; 2) periodic steady-state (PSS) analysis formulated as a mixed boundary value problem that is solved with a hierarchical spectral collocation technique based on a joint Fourier-Chebyshev representation, for both forced and autonomous systems; 3) Floquet theory and analysis for coupled linear periodically time-varying DAE-PDE systems; 4) phase noise analysis for multidomain oscillators; and 5) efficient parameter sweeps for PSS and noise analyses based on first-order and pseudo-arclength continuation schemes. All of these techniques, implemented in a prototype simulator, are applied to a substantial case study: a multidomain feedback oscillator composed of distributed and lumped components in two physical domains, namely, a nano-mechanical beam resonator operating in the nonlinear regime, an electrical delay line, an electronic amplifier and a sensor-actuator for the transduction between the two physical domains.Publication Metadata only Gaziantep tarihi su sisteminin Osmanlı dönemindeki yönetimi(Yildiz Technical Univ, Fac Architecture, 2017) Erçin, Seçil; Kayıran, Petek; N/A; Uçar, Meltem; Researcher; Koç University Research Center for Anatolian Civilizations (ANAMED) / Anadolu Medeniyetleri Araştırma Merkezi (ANAMED); N/A; 13626There exist a historical water tunnel network speared all through the historical urban area of Gaziantep. An underground tunnel, referred to as the livas, brings water from outside of the city and serves many public spaces like mosques, khans, baths, madrasahs and fountains as well as the wells of the privately owned houses. Although the water carriage system isn't designed by an holistic approach and developed by additions throughout the history, the system works as a whole and concerns all users. By being a system that concerns all users and by being in concern of one of the fundamental needs of mankind; water, some rules are settled for the usage of the water. These rules includes information on the physical and historical background of the city. The aim of this study is to clarify the management model of historical water system through ser'iye registers and charter of wakfs. It is also targeted to contribute to the studies to clarify the characteristics of regional water management systems in Ottoman period and evaluate the development of historical water structure of Gaziantep through water usage rules and rights. In the first part of the paper, the general system and rules of water usage in Ottoman period is described. The second part presents the historical water system in Gaziantep, followed in the third part by presenting the subjects related to water system in ser'iye registers and charter of wakfs with evaluations for understanding the characteristics of water system. The last part evaluates the effects of Ottoman Period water usage rules on the formation and development of water system in Gaziantep and contributions to analyze the historical background of the city. / Gaziantep’te tarihi kent dokusunun tamamına yayılmış bir su yolu ağı bulunmaktadır. Yer altında kazılmış livas adı verilen tünellerle şehir dışındaki kaynaktan şehre taşınan su, şehir içinde su yolu ağı oluşturarak halkın kullanımına açık birçok cami, han, hamam, medrese, kastel ve çeşme yapılarına su sağlamaktadır; ayrıca özel kullanımdaki evlerin kuyuları da bu sistemden su almaktadır. Bütüncül tasarlanmamış ve zaman içinde eklenerek büyümüş olmakla birlikte bütüncül işleyen ve bütün kenti ve su hattındaki yerleşimleri ilgilendiren bir su yolları ağı oluşmuştur. Bütün kullanıcıları ilgilendiren bir sistem olması ve yaşamın temel gereklerinden biri olan su ile ilgili olması nedeni ile suyun dağılımı ve kullanımı ile ilgili birtakım kurallar oluşmuştur. Bu kurallar kentlerin fiziki oluşumunu ve tarihi gelişimini çözümlemeye yardımcı veriler sunmaktadır.Bu çalışmanın amacı vakfiyeler ve şer’iye sicilleri ışığında Osmanlı döneminde Gaziantep’te, kullanım hakları, kuralları ve bakımını içeren su yönetim sistemini ortaya çıkartmak ve Gaziantep tarihi su sisteminin gelişimini su kullanım hakları ve kuralları üzerinden değerlendirmektir. Bu çalışma ile Osmanlı dönemi su yönetiminin bölgesel özelliklerinin belirlenmesine katkı sağlamak hedeflenmektedir. Birinci bölümde Osmanlı dönemi idari yapılanması içinde su kullanımı ile ilgili genel yaklaşımlar, kurallar ve örgütlenme biçimi anlatılmaktadır. ikinci bölümde Gaziantep tarihi su sistemi hakkında bilgi verilirken üçüncü bölümde vakfiyeler ve şer’iye kayıtlarındaki su yolları ve su kullanımı ile ilgili konular su sistemini anlamaya yönelik değerlendirmelerle aktarılmaktadır. Son bölümde ise Gaziantep’te Osmanlı döneminde geçerli olmuş olan su kurallarının tarihi su sisteminin oluşumu ve gelişimine etkileri ve kent tarihini çözümlemeye katkıları değerlendirilmektedir.Publication Metadata only The cultural lives of domestic objects in late antiquity(Cambridge Univ Press, 2020) Department of Archeology and History of Art; Uytterhoeven, Inge; Faculty Member; Department of Archeology and History of Art; College of Social Sciences and Humanities; 27313N/APublication Metadata only An efficient 2-party private function evaluation protocol based on half gates(Oxford Univ Press, 2019) Bingol, Muhammed Ali; Kiraz, Mehmet Sabir; Levi, Albert; N/A; Biçer, Osman; PhD Student; Graduate School of Sciences and Engineering; N/APrivate function evaluation (PFE) is a special case of secure multi-party computation (MPC), where the function to be computed is known by only one party. PFE is useful in several real-life applications where an algorithm or a function itself needs to remain secret for reasons such as protecting intellectual property or security classification level. In this paper, we focus on improving 2-party PFE based on symmetric cryptographic primitives. In this respect, we look back at the seminal PFE framework presented by Mohassel and Sadeghian at Eurocrypt'13. We show how to adapt and utilize the well-known half gates garbling technique (Zahur et al., Eurocrypt'15) to their constant-round 2-party PFE scheme. Compared to their scheme, our resulting optimization significantly improves the efficiency of both the underlying Oblivious Evaluation of Extended Permutation (OEP) and secure 2-party computation (2PC) protocols, and yields a more than 40% reduction in overall communication cost (the computation time is also slightly decreased and the number of rounds remains unchanged).Publication Metadata only A sound status among the Ottoman elite architectural patrons of sixteenth-century Istanbul mosques and their recitation programs(Univ Texas Press, 2018) Department of Archeology and History of Art; Ergin, Nina Macaraig; Faculty Member; Department of Archeology and History of Art; College of Social Sciences and Humanities; N/AN/APublication Metadata only The architects of Ottoman constantinople: the balyan family and the history of Ottoman architecture(intellect Ltd, 2017) Department of Archeology and History of Art; Ergin, Nina Macaraig; Faculty Member; Department of Archeology and History of Art; College of Social Sciences and Humanities; N/AN/APublication Metadata only Design and integration of a bimorph thermal microactuator with electrostatically actuated microtweezers(Institute of Electrical and Electronics Engineers (IEEE), 2008) Yilmaz, Mehmet; Yalcinkaya, Arda D.; Leblebici, Yusuf; Zervas, Michalis; Department of Mechanical Engineering; Alaca, Burhanettin Erdem; Faculty Member; Department of Mechanical Engineering; Koç University Surface Science and Technology Center (KUYTAM) / Koç Üniversitesi Yüzey Teknolojileri Araştirmalari Merkezi (KUYTAM); College of Engineering; 115108A multi-digit gripper is proposed that consists of two electrostatically actuated end-effectors operating in the plane of the device and three thermal end-effectors operating out of plane. The integration of thermal and electrostatic actuation mechanisms is realized by using a three-mask monolithic process. First mask is used to define the silicon electrostatic actuator on SOI wafer. Second mask is used to obtain the bimorph thermal microactuator made of polyimide and aluminum layers on top of the electrostatic actuator. Third and the final mask is used to release the integrated electrostatic and thermal microactuators.Publication Metadata only A reevaluation for the Genoese period of the Galata Tower(Suna ve İnan Kıraç Vakfı Kültür ve Sanat İşletmesi, 2020) N/A; Sağlam, Hasan Sercan; Researcher; Koç University Research Center for Anatolian Civilizations (ANAMED) / Anadolu Medeniyetleri Araştırma Merkezi (ANAMED); N/A; N/AThe Galata Tower has been witness to many historical events and has gone through multiple architectural phases over the course of its long life. Its Genoese origins began to receive scholarly attention particularly in the late eighteenth century and especially during the nineteenth century. In the meantime, a general consensus was reached about the history and architecture of the tower's Genoese period. However, this consensus was actually based on a few primary sources without any comprehensive approaches nor in-depth investigation. The tower's erroneous name, "Tower of Christ" (Christea Turris), during its Genoese period is perhaps the most widespread assumption in the secondary literature. A first construction by Anastasios I and a heightening around 1445/1446 are further related misconceptions. Despite the popularity of Galata as a research topic, these misconceptions have become anonymous and continuously repeated without being questioned. Moreover, slightly different arguments for the tower were put forward. In particular, when compared to later periods of the monument, the former name of the tower, its alleged Byzantine past, and especially the Genoese architectural identity of the present structure remain rather ambiguous in the light of all the arguments in the literature. For these reasons, this article presents a fundamental reevaluation for the Genoese period of the Galata Tower through virtually all of the primary sources and a small architectural survey. This article shows that there is no solid evidence of the supposed Byzantine period of the tower; that it was named as the "Tower of Holy Cross" (Turris Sancte Crucis) by the Genoese who built it, and its first structural alteration was probably executed by the Ottomans around 1453. / Galata Kulesi’nin uzun yaşamı, birçok tarihî olaya ve mimari evreye tanıklık etmiştir. Bu doğrultuda kuleye yönelik bilimsel araştırmalar on sekizinci yüzyılın sonunda ve özellikle on dokuzuncu yüzyılda yoğunlaşmış, yapının Ceneviz dönemi ve öncesine ilişkin başlıca argümanlar bu süreçte şekillenmiştir. Lakin başvurulan sınırlı sayıdaki birincil kaynak, kapsamlı bir bakış açısıyla ele alınmamış, bazı noktalar üstünkörü yorumlanmıştır. Bunlar arasında belki de en yaygın olanı, kulenin Ceneviz dönemindeki adının ikincil kaynaklarca yanlış bir şekilde “İsa Kulesi” (Christea Turris) zannedilmesidir. İlk inşasının I. Anastasios tarafından yapılması ve Ceneviz döneminde 1445–1446 civarında yükseltilmesi ise diğer yanılgılardır. Tüm bu görüşler, Galata’nın artık alışılmış akademik popülerliğine karşın pek sorgulanmamış ve zamanla anonimleşerek kuleye dair temel bilgilere dönüşmüştür. Bu esnada farklı birincil kaynaklar irdelenerek başka iddialar da öne sürülmüş ve sonuç olarak kuleye yönelik bilgilerde birtakım ikilikler ortaya çıkmıştır. Öyle ki, Galata Kulesi’nin Ceneviz öncesi dönemi, Ceneviz dönemindeki adı ve bunların yanında özellikle de mevcut yapının bu dönemden geriye kaldığı düşünülen kısmı, literatürdeki tüm argümanların ışığında ve anıtın daha sonraki dönemlerine kıyasla bir hayli muğlaktır. Dolayısıyla bu makale, Galata Kulesi’nin Ceneviz döneminin, tarihî ve mimari açılardan temel düzeyde bir yeniden değerlendirmesidir. Kayda değer bulgularsa kulenin Bizans dönemine uzanan bir geçmişi olduğuna dair ortada somut hiçbir verinin bulunmadığı; inşa edildiği Ceneviz dönemindeki isminin yalnızca “Kutsal Haç Kulesi” (Turris Sancte Crucis) olduğu ve ilk yapısal değişikliğini de Osmanlılar tarafından 1453 dolaylarında geçirdiğine işaret etmektedir.Publication Metadata only Online optimization of first-responder routes in disaster response logistics(IBM, 2020) N/A; Department of Industrial Engineering; Shiri, Davood; Salman, Fatma Sibel; PhD Student; Faculty Member; Department of Industrial Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; 178838After a disaster, first responders should reach critical locations in the disaster-affected region in the shortest time. However, road network edges can be damaged or blocked by debris. Since response time is crucial, relief operations may start before knowing which edges are blocked. A blocked edge is revealed online when it is visited at one o f its end-nodes. Multiple first-responder teams, who can communicate the blockage information, gather initially at an origin node and are assigned to target destinations (nodes) in the disaster-affected area. We consider multiple teams assigned to one destination. The objective is to find an online travel plan such that at least one of the teams finds a route from the origin to the destination in minimum time. This problem is known as the online multi-agent Canadian traveler problem. We develop an effective online heuristic policy and test it on real city road networks as well as randomly generated networks leading to instances with multiple blockages. We compare the performance of the online strategy with the offline optimum and obtain an average competitive ratio of 1.164 over 70,100 instances with varying parameter values.