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Location Choice under Spillovers
No full textThis paper introduces the location choice under spillovers game: A number of firms choose from among a number of alternative locations. A firm’s payoff at some location is the sum of two factors: Its location-specific idiosyncratic payoff; and the positive spillover it receives, which is a function of the number of firms choosing the same location. The spillover function is location-specific and monotonically increasing. This game form can be viewed as an extension of the classic “battle of sexes” game. It can also be used to model real-life game-theoretic situations with network effects, such as when app users choose from alternative social media or instant messaging apps. In our main result, we show that the location choice under spillovers game is a potential game, and hence, it always admits a Nash equilibrium in pure strategies. We also show that: A Nash equilibrium outcome need not be Pareto efficient. An outcome that is Pareto efficient need not be a Nash equilibrium. And a Nash equilibrium is not necessarily a strong equilibrium
Solar-Assisted All-Solid Supercapacitors Using Composite Nanostructures of Zno Nanowires With Go and Rgo
No full textSolar-powered energy storage using integrated photo-supercapacitor (PSC) systems is drawing significant attention as a potential solution for the current energy problems. This work intends to prepare a facile, efficient, and low-cost two-electrode configuration all-solid-state PSC having zinc oxide nanowire (ZnO NW) composites with graphene oxide (GO) and reduced graphene oxide (rGO) as a remedy for the complexity and high-cost of the present PSC devices. The specific capacitance (C-p) and energy density of the GO/ZnO NW-based PSC increased 3.2 and 1.9 (@56 mA g(-1)) times under UV illumination, respectively. Furthermore, the GO/ZnO NW-based PSC showed excellent stability for 5000 cycles with 100% capacitance retention and Coulombic efficiency. The superior performance and excellent stability due to the charge trap properties for the GO/ZnO NW-based PSC as compared to rGO/ZnO NW-based PSC have been confirmed using open circuit potential (V-OC) and low-temperature electron paramagnetic resonance (EPR) spectroscopy under UV on/off conditions. Hence, it has been concluded that GO/ZnO NW material and the proposed device configuration in this work are very favourable for future electronic applications.SONATA BIS project [2020/38/E/ST5/00176]; Norway Grants 2014-2021 [29/2020]I. I. acknowledges the partial financial support from the SONATA BIS project 2020/38/E/ST5/00176. M. D. L acknowledges the partial financial support from the Norway Grants 2014-2021, under Project no. 29/2020
Üniversite Birinci Sınıf Öğrencilerinin Üniversite Yaşamına Uyum Düzeylerinde Kontrol Duygusunun Rolü
No full textBu araştırmada, kontrol duygusunun üniversite birinci sınıf öğrencilerinin üniversite yaşamına uyum sürecindeki rolünün incelenmesi amaçlanmıştır. Ayrıca öğrencilerde kontrol duygusunun yaş, cinsiyet, ikamet durumu gibi demografik değişkenlere göre farklılaşıp farklılaşmadığı da incelenmiştir. Araştırma grubu, Ankara Üniversitesi’nde farklı bölümlerde öğrenim gören 181’i kadın, 139’u erkek olmak üzere toplam 320 birinci sınıf öğrencisinden oluşmaktadır. Araştırma kapsamında Lachman ve Weaver (1998a) tarafından geliştirilen Kontrol Duygusu Ölçeği yazar tarafından Türkçeye uyarlanmıştır ve veri toplama aracı olarak kullanılmıştır. Bu ölçeğin yanı sıra Aladağ, Kağnıcı, Tuna ve Tezer’in (2003) geliştirdiği Üniversite Yaşamı Ölçeği ile öğrencilere yönelik veri toplamak amacıyla kişisel bilgi formu kullanılmıştır. Verilerin analiz edilmesi amacıyla SPSS programı kullanılarak bağımsız örneklem t testi, tek değişkenli varyans analizi (ANOVA) ve basit doğrusal regresyon analizi yapılmıştır. Bu araştırma sonucunda, üniversite birinci sınıf öğrencilerinin yarıdan fazlasının (%53,4) Kontrol Duygusu Ölçeği’nden elde edilen toplam puan ortalamasının üzerinde puan aldığı ortaya konmuştur. Araştırma sonuçları, öğrencilerin kontrol duygusu düzeyinde, yaş, cinsiyet, kardeş sayısı, yabancı dil hazırlık okuyup okumama, ailesinde kendisinden önce üniversitede okuyan biri olup olmaması, geldiği yerleşim biriminin büyüklüğü, ikamet durumu değişkenlerine göre anlamlı bir farklılık olmadığını göstermektedir. Araştırmada ayrıca, kontrol duygusunun üniversite yaşamına uyumu ve alt boyutlardan üniversite ortamına uyumu, duygusal uyumu, kişisel uyumu, akademik uyumu ve sosyal uyumu yordadığı sonucuna ulaşılmıştır
Predicting Election Results Via Social Media: a Case Study for 2018 Turkish Presidential Election
No full textArticle; Early AccessSocial media platforms provide massive amounts of data that can be used to analyze social issues and forecast events in the future. However, it is a challenging task due to the biased and noisy nature of the data. In this work, we propose a method to predict election results via Twitter. In particular, we first detect the stance of social media accounts using their retweets. Subsequently, we develop four different counting methods for our prediction task. In the simple user counting (SC) method, we count labeled users without taking any further steps to reduce bias. In the city-based weighted counting (CBWC) method, we apply a weighted counting based on the number of electorate in each city. The closest-city-based prediction (CCBP) method utilizes sociological similarity between cities to predict results for cities with limited sample sizes. The using former election results (UFERs) method compares predictions for each city against former election results to detect data bias and uses them accordingly. We evaluate our proposed methods with the data collected for the presidential election of Turkey held in 2018. In our extensive evaluation, we show that utilizing domain-specific information and location-based weighted counting is effective in reducing bias. CBWC, CCBP, and UFER methods outperform tweet-counting-based baseline methods. Furthermore, UFER and CCBP outperform almost all traditional polls, suggesting that social media platforms are alternative mediums for conducting election polls.Scientific and Technological Research Council of Turkey (TUBITAK) [ARDEB 3501, 120E514]This work was supported by the Scientific and Technological Research Council of Turkey (TUBITAK) ARDEB 3501 under Grant 120E514. The numerical calculations reported in this paper were partially performed at TUBITAK ULAKBIM, High Performance and Grid Computing Center (TRUBA resources)
A Qualitative Investigation Into Student Empowerment in Higher Education: Perceptions of Students, Faculty Members and Administrators
No full textThe aim of this study was to explore the concept of student empowerment and empowering aspects of the higher education curricula as perceived by the students, faculty members and administrators. The research design was a case study and it is conducted at a private university in Turkey. The data were obtained via semi-structured interviews with 24 undergraduate students, eight faculty members and five administrators. The findings of the study revealed the complexity and multi-dimensionality of student empowerment. Participants defined empowered students in higher education as having active personal and social characteristics. Different members' views of the empowering factors overlapped to a great extent and they were grouped under three interconnected dimensions: academic, social and political empowerment. Participants' reports indicate that student empowerment in university curricula depends on several factors, such as faculty qualifications, active student participation in curriculum decisions, student clubs, extracurricular activities, and whether students have the opportunity/right to voice their demands and objections. The data analysis points out a possible existence of a fourth dimension which centers around personal characteristics. Hence, further research is needed to prove the existence of this fourth dimension as in the current data set it did not come forth as a major dimension. Furthermore, the findings revealed that democratic understanding is a precondition for student empowerment and a deep democratic understanding is needed in higher education institutions
Kıymetli Evrak Hukuku, Genel Esaslar-kambiyo Senetleri,
No full textGüncellenmiş 6. Bası[No Abstract Available
Review on Architectural Tectonics Through Meaning and Making
No full textThe architectural tectonics is built upon a strong distinction between meaning and making. Since Vitruvius, the makers and thinkers seek fort he formulation of what good architecture is based upon such distinnction. Each time, good architecture has re-formulated and re-defined regarding the changes and the developments in the course of history. At this stage, this paper aims to map and re-frame the meaning and making through changing tectonic paradigms and aims to question the meaning and making in the context of advancing technology
Modelling an Acousto-Optic Beam Shaping Device for a DIRCM Laser Laboratory Setup
No full textDirected Infrared Counter Measure (DIRCM) laser laboratory setups are used to mimic the real life DIRCM system and IR heat-seeking missile engagement scenarios in isolated laboratory environments. Typically, the output beam of a mid-infrared (Mid-IR) laser source is modulated in time using an acousto-optic (AO) modulator (AOM). Following the AOM in the optical path, within a distance of few meters, the laser beam is expanded and collimated, using traditional methods to have almost a uniform intensity profile at the target aperture [1, 2]. The whole process results in the simulation of the engagement of a countermeasure laser with an IR heat-seeking missile on an optical table. AO devices, besides their common usage of modulation, can also be used to transform a given laser beam profile into various other beam profiles [3]. By applying an RF signal consisting of multiple frequency components to an AO device, diffraction occurs into multiple orders. By this way, various beam profiles can be obtained along the optical path. In this study, we analyze the usage of an AO device in order to have an expanded beam profile with a uniform intensity distribution at few meters away from the laser source that is enough to cover an IR seeker's aperture. With the use of an AO device for beam shaping, we aim to alleviate the need of costly and complex optical setups. The analysis is made in two dimensions using a numerical simulation software, which employs the finite element method with appropriate boundary conditions
