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    Article
    Red Vienna: Ideology, Architecture and Art in the Reumannhof Municipal Social Housing
    (Middle East Technical Univ, 2024) Pfeiffer Tas, Sule; Temel, Rabia; Taş, Şule PFEIFFER
    This study focuses on the Reumannh of Social Housing Complex, which was designed by Hubert Gessner (1871-1943) and constructed between 1924 and 1926 in Vienna. It was one of the largest buildings as part of the Municipal Social Housing Program for workers implemented under the leadership of Jakob Reumann, who was the mayor of Vienna between 1919 and 1923. According to the social democratic ideology in Vienna, known as the Red Vienna period (1919-1934) of the city administration, this program aimed to meet the housing needs of the working class and to provide them with better living conditions. Due to the increase in worker migration to the city after the Industrial Revolution and upon the demolition of the city during World War I, a housing crisis emerged in Vienna and unfavorable living conditions - such as one-room apartments and rental beds even for a few hours - became a necessity. The paper attempts to probe into the nature of the connection between the Reumannh of Complex architecture and the Red Vienna ideology in light of the social democratic perspective of the working class. In order to do so, the entire structure - known as "the palace of the working class" - is analyzed in detail while pointing to similar social housing complexes, such as Metzleinstalerh of on the Margareteng & uuml;rtel known as "Proletarian's Boulevard" and nearby. Additionally, the standardization criteria, as envisioned within the context of the social housing program, are examined to find out any traces of their presence (or improvements/modifications upon them) in the Reumannh of Complex. In the context of the political and socio-economic conditions of that era, a comparative analysis of the architectural elements and landscape architecture is conducted, such as courtyards and Haydn park on the front in the latter case. Original archival documents, photographs, and drawings of the complex were collected and during the course of the field research, photographs were taken. A housing typology and drawings were made in accordance with the general floor plan of the building, drawn by Gessner himself to determine the details related to the features of the houses - such as kitchen, living room+kitchen, and the number and function of the rooms - in order to determine the reflection of the living comfort promised by the social democratic ideology. As a result, three main plan types were identified based on the spaces contained within the houses, and subgroups were created according to balconies, terraces, or bay windows, all of which provided daylight and fresh air. In conclusion, the research establishes that the Reumannhof Complex houses, common facilities as terraces, infant school, laundry rooms, etc. all implemented standards that were mostly aligned with those related to welfare and in line with the principles of social democratic ideology. Lastly, it is revealed that architectural and artistic elements, such as wrought iron, ceramic panels illustrating craftsmen and different professions, motifs, and sculptures, not only reflect the social democratic ideology and motto, but also create new living environments by integrating architectural design with green spaces for the working class. As witness to this assertion, it is useful to notice that the complex still serves the function of economic housing for the working class and remains important as a symbol of social democratic ideology.
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    STUDY ON CLOUD COMPUTING PERCEPTION OF TURKISH IT SECTOR
    (Univ Osijek, Tech Fac, 2016) Okan, Aylin Akca; Hacaloglu, Tuna; Yazici, Ali
    In this paper an empirical study was carried out to study the Cloud Computing (CC) perception in Turkey. To this extent this study intends to determine the perception of Information Technology decision makers such as Chief Executive Officers and Chief Information Officers by means of a survey by questionnaire approach to explore 98 both public and private IT executives' understandings and concerns about CC. The survey aims to determine how CC is perceived by public or private organizations that are already involved in the e-transformation process. Major results of the study are as follows: both public and private sector executives have positive perception over adoption of CC, participants think that especially web, e-mail, data storage and process management applications are adequate for CC. Lack of well-educated and experienced staff is found to be the common barrier on adopting CC by both public and private sector participants.
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    Conference Object
    Citation - WoS: 13
    Search-Based Parallel Refactoring Using Population-Based Direct Approaches
    (Springer-verlag Berlin, 2011) Kilic, Hurevren; Koc, Ekin; Cereci, Ibrahim
    Automated software refactoring is known to be one of the "hard" combinatorial optimization problems of the search-based software engineering field. The difficulty is mainly due to candidate solution representation, objective function description and necessity of functional behavior preservation of software. The problem is formulated as a combinatorial optimization problem whose objective function is characterized by an aggregate of object-oriented metrics or pareto-front solution description. In our recent empirical study, we have reported the results of a comparison among alternative search algorithms applied for the same problem: pure random, steepest descent, multiple first descent, simulated annealing, multiple steepest descent and artificial bee colony searches. The main goal of the study was to investigate potential of alternative multiple and population-based search techniques. The results showed that multiple steepest descent and artificial bee colony algorithms were most suitable two approaches for an efficient solution of the problem. An important observation was either with depth-oriented multiple steepest descent or breadth-oriented population-based artficial bee colony searches, better results could be obtained through higher number of executions supported by a lightweight solution representation. On the other hand different from multiple steepest descent search, population-based, scalable and being suitable for parallel execution characteristics of artificial bee colony search made the population-based choices to be the topic of this empirical study. I In this study, we report the search-based parallel refactoring results of an empirical comparative study among three population-based search techniques namely, artificial bee colony search, local beam search and stochastic beam search and a non-populated technique multiple steepest descent as the baseline. For our purpose, we used parallel features of our prototype automated refactoring tool A-CMA written in Java language. A-CMA accepts bytecode compiled Java codes as its input. It supports 20 different refactoring actions that realize searches on design landscape defined by an adhoc quality model being an aggregation of 24 object-oriented software metrics. We experimented 6 input programs written in Java where 5 of them being open source codes and one student project code. The empirical results showed that for almost all of the considered input programs with different run parameter settings, local beam search is the most suitable population-based search technique for the efficient solution of the search-based parallel refactoring problem in terms of mean and maximum normalized quality gain. However, we observed that the computational time requirement for local beam search becomes rather high when the beam size exceeds 60. On the other hand, even though it is not able to identify high quality designs for less populated search setups, time-efficiency and scalability properties of artificial bee colony search makes it a good choice for population sizes >= 200.
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    Study on cloud computing perception of Turkish IT sector;
    (Strojarski Facultet, 2016) Akca Okan,A.; Hacaloglu,T.; Yazici,A.; Okan, Aylin Akca
    In this paper an empirical study was carried out to study the Cloud Computing (CC) perception in Turkey. To this extent this study intends to determine the perception of Information Technology decision makers such as Chief Executive Officers and Chief Information Officers by means of a survey by questionnaire approach to explore 98 both public and private IT executives’ understandings and concerns about CC. The survey aims to determine how CC is perceived by public or private organizations that are already involved in the e-transformation process. Major results of the study are as follows: both public and private sector executives have positive perception over adoption of CC, participants think that especially web, e-mail, data storage and process management applications are adequate for CC. Lack of well-educated and experienced staff is found to be the common barrier on adopting CC by both public and private sector participants. © 2016, Strojarski Facultet. All rights reserved.
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    Article
    Citation - WoS: 8
    Citation - Scopus: 9
    First-principles studies of Tin+1SiNn (n=1, 2, 3) MAX phase
    (Taylor & Francis Ltd, 2020) Surucu, Gokhan; Gullu, Hasan Huseyin; Candan, Abdullah; Yildiz, Bugra; Erkisi, Aytac
    In this study, the structural, electronic, mechanical, lattice dynamical and thermodynamic characteristics of ( 1, 2 and 3) phase compounds were investigated using the first principle calculations. These ternary nitride compounds were found to be stable and synthesisable, and the results on the stability nature of them were also evaluated for the possible and phases. -was found to be the most stable one among these new class of layered phases for which limited works are available in the literature. The band structures, that are essential for the electronic properties, were determined along with the partial density of states (PDOS) indicating the metallic behaviour of these compounds. The polycrystalline elastic moduli were calculated based on the single-crystal elastic constants and the mechanical stabilities were verified. Some basic physical parameters, such as bulk modulus, shear modulus, Young's modulus, Poisson's ratio, Debye temperature, and sound velocities, were also predicted. Furthermore, the anisotropic elastic properties were visualised in three dimensions (3D) for Young's modulus, linear compressibility, shear modulus and Poisson's ratio as well as with the calculation of the anisotropic factors. - phase showed the most isotropic characteristics with minimum deviations. These theoretical values were also used to identify the stiffness and ionic characteristics. The phonon dispersion curves and corresponding PDOS indicated that compounds were dynamically stable. Moreover, thermodynamic properties obtained from phonon dispersion curves were investigated in detail.
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    Article
    Citation - WoS: 3
    EFFECT OF Y, Au AND YAu NANOSANDWICHING ON THE STRUCTURAL, OPTICAL AND DIELECTRIC PROPERTIES OF ZnSe THIN FILMS
    (Natl inst R&d Materials Physics, 2019) Qasrawi, A. F.; Taleb, M. F.
    In this article, we report the effects of insertion of yttrium, gold and yttrium-gold (YAu) metallic nano-slabs on the structural, optical and dielectric properties of ZnSe thin films. The ZnSe thin films which are prepared by the thermal evaporation technique under vacuum pressure of 10-5 mbar exhibit hexagonal structure. While the insertion of the 70 nm thick Y layers does not alter the lattice parameters and stress values, the Au and YAu layers increased the lattice parameters along the a- and c-axes and decreased the stress values. In addition, the insertion of these metallic layers slightly alters the value of the energy band gap and increases the width of the interbands. The light absorbability are increased by 1.4, 2.0 and 2.4 times upon insertion of Y, Au and YAu, slabs, respectively. On the other hand, the dielectric and optical conductivity analyses has shown that the use of the YAu stacked metal layers increases the real part of the dielectric constant, the optical conductivity, the drift mobility and extended the plasmon frequency range from 35.1 to 254.0 (Omega cm)(-1), from 1098 to 1766 cm(2)/vs and from 0.94-3.11 GHz to 2.13-4.83 GHz, respectively. The insertion of the two stacked metallic layers between two layers of ZnSe makes the ZnSe more appropriated for thin film transistor technology.
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    Existence, Uniqueness and Successive Approximations for (λ, Ψ)-Hilfer Fractional Differential Equations
    (Univ Politehnica Bucharest, Sci Bull, 2024) Krim, Salim; Salim, Abdelkrim; Benchohra, Mouffak; Karapinar, Erdal
    The focus of this paper is on investigating a particular type of nonlinear (lambda, psi)-Hilfer fractional differential equations, and analyzing their existence results. Our approach involves utilizing Banach's fixed point theorem, and we also explore the global convergence of successive approximations to provide additional insights into the topic. To further illustrate our findings, we provide some examples that supplement our main results.
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    Article
    Citation - WoS: 17
    Citation - Scopus: 16
    A Study on Reliability of Coherent Systems Equipped With a Cold Standby Component
    (Springer Heidelberg, 2014) Eryilmaz, Serkan
    In this paper, we investigate the effect of a single cold standby component on the performance of a coherent system. In particular, we focus on coherent systems which may fail at the time of the first component failure in the system. We obtain signature based expressions for the survival function and mean time to failure of the coherent systems satisfying the abovementioned property.
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    Article
    Citation - WoS: 7
    Citation - Scopus: 8
    Modeling Systems With Two Dependent Components Under Bivariate Shock Models
    (Taylor & Francis inc, 2019) Eryilmaz, Serkan
    Series and parallel systems consisting of two dependent components are studied under bivariate shock models. The random variables N-1 and N-2 that represent respectively the number of shocks until failure of component 1 and component 2 are assumed to be dependent and phase-type. The times between successive shocks are assumed to follow a continuous phase-type distribution, and survival functions and mean time to failure values of series and parallel systems are obtained in matrix forms. An upper bound for the joint survival function of the components is also provided under the particular case when the times between shocks follow exponential distribution.