05. Fakülteler

Permanent URI for this communityhttps://hdl.handle.net/20.500.11779/7

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Citation - WoS: 1
Citation - Scopus: 1
A Simplified Approach for Site-Specific Design Spectrum
(2018) Tönük, Gökçe; Kurtuluş, Aslı; Ansal, Atilla
The design acceleration spectrum requires site investigations and site-response analyses in accordance with the local seismic hazard. The variability in earthquake source and path effects may be considered using a large number of acceleration records compatible with the earthquake hazard. An important step is the selection and scaling of input acceleration records. Likewise, a large number of soil profiles need to be considered to account for the variability of site conditions. One option is to use Monte Carlo simulations with respect to layer thickness and shear wave velocity profiles to account for the variability of the site factors. The local seismic hazard analysis yields a uniform hazard acceleration spectrum on the bedrock outcrop. Site-specific response analyses also need to produce a uniform hazard acceleration spectrum on the ground surface. A simplified approach is proposed to define acceleration design spectrum on the ground surface that may be considered a uniform hazard spectrum.
A Time for Solidarity: Rethinking the Architectural Establishment in the Age of Covid-19
(Intellect, 2022) Yücel, Şebnem
...
Citation - WoS: 54
Citation - Scopus: 64
An Assessment of the Performance of Impedance Tube Method
(Institute of Noise Control Engineering, 2014) Hasan Körük
The impedance tube method is widely used for measuring sound absorption (or reflection) coefficients of acoustic materials as a function of frequency. However, the sound absorption coefficients obtained using the impedance tube method may have some variations due to the dimensions (limits) of an impedance tube, sample preparation and sample mounting. This paper assesses the performance of the two-microphone impedance tube method as a function of frequency for different tube dimensions and materials and presents suggestions for increasing the reliability and repeatability of impedance tube measurements. First, after summarizing a systematic way for measuring acoustic transfer functions, sound absorption coefficients of a variety of materials ranging from conventional absorbing acoustic materials to samples with thin films are measured using two tubes with different tube diameter and microphone spacing. Uncertainty of sound absorption coefficients for various materials is discussed, and the frequency limits of impedance tubes are assessed. Then, a method for minimizing uncertainty due to sample mounting is proposed and the main findings are discussed.
Citation - WoS: 1
Citation - Scopus: 2
An Overview on the Structural Monitoring, Assessment and Retrofitting of Historical Structures With a Focus on 13th Century Monuments
(Springer international Publishing Ag, 2024) Ilki, Alper; Inci, Pinar; Halici, Omer F.; Demir, Cem; Comert, Mustafa; Kuran, Fikret
Monumental historical structures affirm natural and cultural identity and hence they should be transmitted to future generations. The protection and preservation of these structures against aging and natural hazards, particularly seismic actions, requires a comprehensive approach including diagnosis of the present condition of the structure and enhancement of structural capacity for disaster mitigation, if necessary. It is obvious that due to their historical values, any attempt towards the preservation of the monumental historical structures must be carried out with respect to the principles of integrity and authenticity. In this study, the structural performance assessment procedures, implementation of structural health monitoring systems and seismic strengthening strategies are discussed and described with reference to 13th-century monumental historical structures in Turkiye. The structural engineering aspects of recent activities for the restoration and preservation of the Great Mosque and Hospital of Divrigi (a world heritage listed structure) and Sivas Ulu Cami (Mosque) Minaret are briefly presented. In light of the structural analysis and monitoring results, recommendations for interventions to these monumental structures are outlined.
Citation - WoS: 1
Art Museums and the Middle East: a Contested Territory
(Intellect, 2020) Yücel, Şebnem
The Architectural Spotlight section addresses recent projects, debates and events that shape the architectural discourse and practice in Muslim-majority countries as well as in diasporic Muslim communities. In this section, contemporary architectural concerns in diverse cultural, economic, and social conditions are discussed to move toward the varied meanings of 'architecture'in recent geographies of Islam in its global dimensions.
Citation - WoS: 1
Citation - Scopus: 1
Building a Community Through a Design Build Studio Program
(Springer international Publishing Ag, 2025) Inceoglu, Arda
This paper aims to provide a comprehensive and critical assessment of the outcomes stemming from a Design-Build program, a pedagogical approach widely adopted by educational institutions worldwide. These programs are instrumental in equipping students with vital practical skills, often unattainable within the confines of a conventional studio environment. While the objectives of this program align with those of similar initiatives in various educational institutions, an examination reveals an unexpected and substantial outcome. Beyond its primary goals, the Design-Build program has played an integral role in instilling a culture of collaboration and camaraderie within the school, thereby significantly contributing to the overall success of its architectural education. All stages of the program consist of collaborative processes, instilling from an early age the importance of working together by helping each other than individual competition.
Capacity Allocation and Pricing Policies for Cloud Computing Service Providers
(Curran Associates Inc., 2018) Ünlüyurt T.; Özgür Özlük; Afghah, R.
The cloud computing is regarded as a paradigm shift in today’s IT world. As cloud computing resources behave like perishable products, revenue management techniques can be applied to increase cloud service provider's total revenue. In this paper, we propose various methods for pricing and capacity allocation. We consider three types of instances offered by the service provider; subscription, on-demand and spot instances. We introduce three allocation and pricing policies and propose different models. We simulate these models on a randomly generated dataset and evaluate the models for different capacities. The results we obtain indicate the sensitivity of revenue to varying policies and demonstrate the potential profit increase for cloud service providers. © 2018, Curran Associates Inc. All rights reserved.
Classifying the European Football Leagues by Using Balance-Performance Matrix
(Pamukkale University, 2021) Özaydın, Selçuk Mustafa
European football has transformed over the last two decades both financially and athletically. Although the aggregate revenue generated by the European football increases, some leagues grew richer than the others. The inequality in the distribution of revenue caused the talents to accumulate in the Big 5 leagues and left the others with no chance to compete. Especially after the introduction of Financial Fair Play, teams from other leagues became in desperate need of transfer income which accelerated the accumulation of talent. This paper proposes a matrix, the Balance-Performance Matrix, for classifying leagues with respect to their transfer balance and sportive performance. As the results of the matrix illustrate, some leagues indeed became suppliers for the Big 5 and they have lost their competitive edge whereas some are still competing despite losing their best talents.
Citation - WoS: 2
Commemorations of Sinan: Creating a National Hero in Turkey in the 1930s
(Intellect, 2023) Sezgin, Ahmet
Sinan (d.1588) is the most renowned architect of the Ottoman Empire. His buildings, located throughout the eastern Mediterranean, were central to a dynastic and religious architectural heritage that was inherited by a modern and secular Turkish nation state, established in 1923. This article examines how Sinan was refashioned as a national hero in the early decades of the Republic. It focuses on commemorations of Sinan and their major venue: his Süleymaniye Mosque in Istanbul. In my analysis of these commemorations, I draw on a wide and diverse array of primary source materials, including written, photographic, artistic, and other visual materials from the 1930s and 1940s that are located in official, semi-official, and other collections. By doing so, this article reveals how the variety of nationalist approaches to Sinan and his architecture coexisted and competed.
Citation - WoS: 1
Citation - Scopus: 2
Compaction and Shear Strength Behavior of Fresh and Aged Basic Oxygen Furnace (bof) Steel Slag
(2016) Yıldırım, İrem Zeynep; Prezzi, Monica
Use of industrial by-products in geotechnical engineering projects, such as in the construction of highway embankments, is advantageous because large volumes of these materials can be utilized. Basic oxygen furnace (BOF) steel slag is one of these industrial by-products. This paper provides a brief background on the characteristics of BOF steel slag and presents the results of a series of laboratory tests (grain-size analysis, maximum and minimum dry density, compaction, large-scale direct shear tests (LDS) and isotropically consolidated-drained triaxial compression (CID TX) performed on fresh and aged BOF steel slag generated from an Indiana steel plant. BOF steel slag samples from three different batches of production were tested, which allowed an evaluation of both aging processes and the effect of changes in gradation on the mechanical properties. The BOF steel slag tested in this study contained sand-size particles with varying percentages of gravel-and silt-size fractions. The moisture-density relationships for BOF steel slag were irregular with two peaks. Based on the LDS and CID TX test results, the BOF steel slag exhibited superior strength and stiffness characteristics than conventional geo-materials. The mechanical properties of fresh and aged BOF steel slag are discussed in the context of its use in geotechnical applications.
Contesting Labels: Revisiting Old Questionnaires
(Cambridge University Press, 2020) Ada, Serhan; Yücel, Şebnem
As a response to several questionnaires, manifestos, interviews, and letters that were included in the book Modern Art in the Arab World: Primary Documents, this article carries out a new questionnaire with seven artists form various backgrounds and geographies, in an attempt to update and re-question some of the issues that were highlighted in the collected essays. The questionnaire includes three questions, each focusing on a different issue. The first issue considers the validity of the term “Arab Art,” the second tries to identify the main dynamics of contemporary artistic production, and the last one questions the relation of contemporary production of arts to geography and history. The following interviews have been edited for consistency and clarity.
Die Naturrechtsrenaissance in Deutschland nach 1945 in ihrem Historischen Kontext - Mehr als nur eine Rechtsphilosophische Randnotiz?
(2013) Arndt Künnecke
…
Drawing the Line: on the Impossibility of Utopia
(Intellect Ltd, 2024) Yücel, Şebnem
When Dutch artist Joep van Lieshout ventured into developing a zero -carbon, no -waste city in 2005, there were no such examples in the world. His artistic vision, complete with a full set of drawings and models, predated any real attempts to build one.1 Van Lieshout, a controversial artist known for his independent state in Rotterdam harbour (AVL-Ville), has 'dissected systems' in his work, be they systems of society or of the human body.2 While dissecting systems, he has often turned to design and architecture, creating provocative work that blurs the line between reality and fantasy.3 His 2005 zero -carbon city project was no exception.4 Van Lieshout's city was a compact one, covering approximately fifty square kilometres. With a set of calculations, models, drawings, paintings, and even objects, the project was complete. A business plan that accompanied the design outlined a program to maintain the city's profitability, an annual profit of 7.5 billion Euro to be exact.5 The project's description referenced some of the important keywords for urban design today, including zero -carbon design, efficiency, and profitability, ultimately suggesting a responsible, ethical, and a desired future. This was not exactly the case, however. This was - as he labelled it - a 'Slave City'. As the name suggests, Van Lieshout's Slave City would be populated by worker slaves who would be divided into four categories:6 healthy and suitable for work (6 per cent of the population), healthy and unsuitable for work (16 per cent), unhealthy and unsuitable for work (29 per cent) and the majority, unhealthy, unsuitable for work, and tasteless (49 per cent).7 Based on these
Citation - WoS: 2
Citation - Scopus: 1
Eaf Ladle Steel Slag as a Geo-Material: Compaction and Shear Strength Characteristics
(2018) Yıldırım, İrem Zeynep; Prezzi, Monica
The numerous issues associated with the excess steel slag that is disposed of in landfills every year can be reduced by using it as a geo-material. This paper provides the results of laboratory tests (i.e., sieve, hydrometer, specific gravity, compaction, compaction-particle degradation, and large-scale direct shear with a box size of 30.5 x 30.5 x 20 cm) performed on electric-arc-furnace ladle [EAF(L)] steel slag from a mini-mill in Indiana. Based on standard proctor test results, the maximum dry unit weight values of the EAF(L) steel slag were in the 16.8-to-20 kN/m(3) range at the optimum moisture contents of 11-13%. The results of the large-scale direct shear tests performed on EAF(L) steel slag, compacted at 95-100% relative compaction and sheared with normal stress ranging from 50 to 300 kPa, showed that it has excellent frictional characteristics, with friction angles between 40 and 45 degrees. Based on the results from this study, due to its shear strength characteristics, EAF(L) steel slag has the potential to be utilized as a geo-material to improve the shear strength of various marginal soils.
Executive Remuneration of Company Directors Under Eu Law and Turkish Law
(Istanbul University Press, 2023) Özcanlı, Fatma Beril
The criteria to determine the material scope of executive pay has always been a controversial aspect of corporate law and corporate governance. The controversy stems from the fact that the board of directors generally tends to determine a suitable executive remuneration for its members, not considering the interests of other stakeholders. In some cases, an independent compensation/remuneration committee is appointed by the board of directors and determines the amount of executive pay. Depending on the legislation, this may require additional approval at the annual general meeting by the shareholders. European legislators have differing approaches with regards to regulating this very area of corporate pay. The revised Shareholders Rights Directive requires an enhanced approach for the shareholders' role by determining the remuneration policy of the company. These amendments can be identified as the promotion of the say on pay, on the remuneration policy, and remuneration report. Furthermore, the previous recommendations have also set the criteria to determine the amount of remuneration. The Directive contains provisions for setting up a clear and transparent corporate remuneration policy and shareholders' binding vote with temporary derogations. The corporate remuneration system of Turkish law is legislated under Art. 394 TCC (Turkish Commercial Code Nr. 6102), which only requires that board members can be paid an honorarium, salary, bonus, premium, and a portion of the annual profit, provided that this amount is determined by the articles of association, or by way of a general meeting resolution. Art. 408 TCC also stipulates a binding general meeting approval of the remuneration policy, whereas Art. 513 TCC requires the framework with regard to bankruptcy procedures. © 2023 Istanbul University Press. All rights reserved.
Free(?) Space at the 2018 Venice Biennale
(Intellect Books, 2019) Yücel, Şebnem
In his article ‘Out of Site/In Plain View: On the Origins and Actuality of the Architecture Exhibition’, architectural historian and curator Barry Bergdoll starts by asking the obvious question: ‘What does it mean to exhibit architecture? Isn’t architecture, once it is built, always already on display?’1 Despite always being on display, however, architecture escapes being exhibited. Because we cannot exhibit architecture in the way an artist can exhibit a painting or a sculpture.
Citation - WoS: 1
Citation - Scopus: 1
Fuzzy Elephant Herding Optimization and DBSCAN for Emergency Transportation: A Case Study for the 2023Turkiye Earthquake
(Springer international Publishing Ag, 2024) Drias, Yassine; Drias, Habiba
In recent times, our planet has experienced numerous natural disasters across all continents. The damage caused by these disasters has been so extensive that Emergency Medical Services (EMS) proved incapable of handling the situation. In this article, we present a novel approach for urgent disaster transport with the aim of minimizing loss of life. In this context, we are investigating the Density-Based Spatial Clustering of Applications with Noise algorithm (DBSCAN) to cluster the large geographic zone affected by the 2023 earthquake in Turkiye. The clustering is done based on hospitals' capacity on one hand and damages on the other hand. The ambulance dispatching task is then tackled using a new fuzzy version of Elephant Herding Optimization called FEHO. This approach addresses the challenge of dispatching ambulances to cover emergency locations effectively and optimally in the clustered regions. Experiments conducted on real data demonstrate the effectiveness of our approach in managing emergency transportation and highlight its potential to minimize the number of casualties.
Citation - WoS: 5
Citation - Scopus: 6
Generation of Feasible Integer Solutions on a Massively Parallel Computer Using the Feasibility Pump
(2017) Mehrotra, Sanjay; Koç, Utku
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.
Citation - WoS: 1
Citation - Scopus: 1
Identification of Candidate Biomarkers and Pathways in Breast Cancer by Differential Network Analysis
(Inderscience Publishers, 2020) Mendi, Onur; Karahoca, Adem
Breast cancer is one of the most malignant cancers in women worldwide. The aim of the present study was to explore the underlying biological mechanisms of breast cancer. For this purpose, we propose a novel framework to reveal mechanisms that drive disease progression in breast cancer by combining prior knowledge in the literature with differential networking methodology. Our integration framework has resulted in the most important genes and interactions by allowing ranking the breast cancer-specific gene network. YY1, SMARCA5, FOXM1, STAT4 and PTTG1 were found to be the most important genes in breast cancer. Functional and pathway enrichment analyses identified numerous pathways that may play a critical role in disease progression. Considering the success of the comparison of the results with the literature, the systemic lupus erythematosus pathway may be a potential target of breast cancer.
Citation - Scopus: 3
Identification of Material Viscoelastic Properties Using the Motion of a Rigid Sphere Located at Tissue-Mimicking Material Interface in Response To a Dynamic Force
(Trans Tech Publications, 2022) Koç, Hayati Ömer; Körük, Hasan; Beşli, Ayça; Yurdaer, Berk Salih
The motion of a rigid sphere located at tissue-mimicking material interface in response to a dynamic force of short duration for the purpose of the determination of material viscoelastic properties was investigated in this study. The experiments were performed using a rigid sphere located at tissue-like material (gelatin phantom) interfaces. An electromagnet was used to apply the desired dynamic force to the sphere and a high-speed camera was used to track the movement of the sphere. Using the experimentally measured response of the sphere and the dynamic response of the sphere predicted by a sophisticated analytical model of the sphere located at a medium interface, the shear modulus, density and damping of the tissue-mimicking material were determined. The procedure followed in this study successfully produced the shear modulus, density and viscous damping ratio of the 20% (and 30%) gelation phantom as 1320 Pa, 1040 kg/m3 and 0.12 (and 2580 Pa, 1180 kg/m3 and 0.2), respectively. As the sophisticated theoretical model that is valid for small and large sphere displacements includes many parameters for the system such as the mass and size of the sphere, the inertia force of the medium involved in motion and the radiation damping due to shear waves and the experimental setup is very straightforward, it is believed that the procedure proposed in this study can be widely exploited to identify accurate material viscoelastic properties in practice.

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