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Search Results: 1 - 10 of 455 matches for " Yasemin Kayhan Atilgan "
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RobCoP: A Matlab Package for Robust CoPlot Analysis  [PDF]
Yasemin Kayhan Atilgan, Erdinc Levent Atilgan
Open Journal of Statistics (OJS) , 2017, DOI: 10.4236/ojs.2017.71003
Abstract: The graphical representation method, Robust CoPlot, is a robust variant of the classical CoPlot method. CoPlot is an adaptation of multidimensional scaling (MDS), and is a practical tool for visual inspection and rich interpretation of multivariate data. CoPlot enables presentation of a multidimensional dataset in a two dimensions, in a manner that relations between both variables and observations to be analyzed together. It has also been used as a supplemental tool to cluster analysis, data envelopment analysis (DEA) and outlier detection methods in the literature. However, this method is very sensitive to outliers. When a multidimensional dataset contains outliers, this can lead to undesirable consequences such as the inaccurate representation of the variables. The motivation is to produce Robust CoPlot that is not unduly affected by outliers. In this study, we have presented a new MATLAB package RobCoP for generating robust graphical representation of a multidimensional dataset. This study serves a useful purpose for researchers studying the implementation of Robust CoPlot method by providing a description of the software package RobCoP; it also offers some limited information on the Robust CoPlot analysis itself. The package presented here has enough flexibility to allow a user to select an MDS type and vector correlation method to produce either classical or Robust CoPlot results.
An Empirical Approach to Determine the Relationship Strength between Internet Media and Online Readership = nternet Medyas le Okur Aras ndaki li kiyi Saptamaya Y nelik G zleme Dayal Bir Yakla m
Kutluk ?ZGüVEN,Yasemin ATILGAN,Mitat UYSAL
Dogus University Journal , 2009,
Abstract: Web content in the context of online news is growing at a rapid speed where traditional news reading habits shift in favour of the Internet version. At the same time readership behaviour also changes from print paper readers to more selective online users, who expect news services follow general trends of the online media such as dynamic customised content and personalisation. In an environment where users are often reluctant to fill forms or reveal their preferences in news content, this entails that the online news Web site has to track the behaviour of the reader and serve the reader the content that fits his or her requirements. In this study online readership preferences are observed to produce personalised content, types of news articles that are more relevant to the reader’s preferred categories. The problem is then reduced to determining the strength of the relationship between the reader node and the news category nodes, at which a relationship metric is borrowed from Customer Relationship Management studies.
Cultural energy analysis on broilers reared in different capacity poultry houses
Atilgan Atilgan,Hayati Koknaroglu
Italian Journal of Animal Science , 2010, DOI: 10.4081/ijas.2006.393
Abstract: Data obtained from 4 different capacity houses were evaluated to analyse the cultural energy and perfor- mance of broilers. Capacities of housings were 20,000, 25,000, 30,000 and 60,000 birds per production peri- od and they were assigned as HI, HII, HIII and HIV, respectively. The study was conducted in 2005 in which there were 6 production periods of 45 days. Data collected for each period were: date of starting and finish- ing; number of chicks entered and broilers sold; live weight at slaughter; carcass weight; feed consumption for starting, growing and finishing phase; labour; medication, vaccination and disinfectant; electricity con- sumption; heating and cooling methods and amount spent; distance for transportation of feed, chicks, broil- ers, wood shaving, limestone; and other miscellaneous expenditures. Ross 308 chickens in all houses received the same commercial feed and water ad libitum. Chicks were reared under a conventional temper- ature regimen. Chicks were fed starter, grower and finisher diets according to their ages. Even though capac- ities for houses were different their stocking densities were 16.36, 16.00, 16.38 and 16.54 birds/m2 for HI, HII, HIII and HIV, respectively. For cultural energy analysis, feed, transportation, labour, machinery, electric- ity, brooding, and other inputs were calculated and corresponding energy values for each input were obtained from literature. For the analysis it was assumed that carcasses would have 18.2% protein and 15.2% fat. Total cultural energy invested in broilers in HIII was lower than that of broilers in HI (P< 0.05). Energy input per kg live weight gain and per kg carcass of HIII were lower than that of HI (P< 0.05, P< 0.01, respective- ly). The HIII had lower cultural energy ratio for protein energy output than HI (0.01). Energy efficiency (kcal input/kcal output) of HIII was better than that of HI (P< 0.01). Results of the study showed that increasing capacity of housings decreases cultural energy input up to certain capacity and indicated that increasing housing capacity without interfering with performance could be a means for energy conservation in sustain- able agriculture.
Analytical Study of the Cable-Truss Systems on the Glass Certain Walls with Vertical Uses  [PDF]
Yasemin Mesda
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.510099

The aim of this study is to analyze of the cable-glass systems which are used on the glass curtain wall according to their types, degree, architectural and structural effects. The suspended glass system with pre-stressed cable truss (SGSPCT) is widely started to apply after the 1980’s with Serres building. The advantages of these systems are to provide the transparency on the fa?ades and speedy construction process with minimum materials. The disadvantages are: more expensive than other systems and so many details for the joints and load distribution calculations. There are three different architectural design typologies of the SGSPCT system. These are distance bridging systems, between floor system and independent body. These three different typologies can be seen on the same building at the same time. This system has been known as complex structure systems. The twenty five glass buildings which are designed in different systems have been analyzed during this study. After these analyses the five glass buildings which are designed with cable-truss system have been selected for scope of the study. These selected buildings have been included of three different cable-truss system typologies and degree. The methodology of this study is literature survey and building analyses method. The written and visual documents involve books, theses, reports, articles, magazines, drawings, internet sources and applied connection details of the glass buildings. The selected five glass buildings have been detailed analyzed with their architectural drawings, photographs and details. The study consists of five chapters including the introduction chapter. The general information of the glass building and cable-glass system has been mentioned in the first chapter. The structural features, details and analytical information on systems have been explained of the selected buildings in the second chapter. The detailed analyses of these selected buildings have been done according to their schematic drawings with the plans, sections and load distribution in the third chapter. The fourth chapter is discussion section. In this section, cable-truss systems have been compared with their advantages and disadvantages to the other systems. The fifth chapter is the last chapter, many advantages of cable-truss systems have been concluded that the use of glass

KOB Niteli indeki Tekstil ve Haz r Giyim letmelerinin Uluslararas Pazarlara A lmas nda Sekt rel D Ticaret irketlerinin Etkisi(The Effect of Sectoral Foreign Trade Companies In Opening Up of Textile and Ready-Made Clothing SMES To The International Markets)
Y?netim ve Ekonomi , 2006,
Abstract: Although small and and medium size enterprises (SMES) are the first models of management involved in the economic and social structure of the world they have unfortunately never received the necessary attention and importance. A German Economist Dr. E.F. Schumacher’s publication of “Small is Beautiful” in 1973, it was understood that they were economically and social organizations and since that date many researches importantstudied on them. SMES, not only by their economical altributes but also by their social aspects are among the most important factors in development and growth of a society. Besides, SMES undertake very significant roles in economical development of the society they are also economical and social influencing on a number of issues, such as resolving the employment problem, promoting the entrepreneuship and providing the economical and social justice. Today, in almost all of the contries 95-99 % of total enterprises comprises of SMES. In our country, while quantitatively SMES comprise 98 % of all enterprises, they also make considerable contributions to the employment, export and GNP. This study investigates the Turkish Sectoral Foreign Trade Enterprises considered as SMES and their effects on the Turkish economy and particularly on the textile industry .
Investigation of Factors Predicting the Anxiety Level of University Senior Students
International Online Journal of Educational Sciences , 2011,
Abstract: The purpose of this study is to determine the factors predicting the anxiety level of university senior students. Descriptive method was used in this study. The study group is composed by 488 (232 females; 256 males) students studying in different departments of the Faculties of Education and Technical Education, and department of physical education and sports teaching of School of Physical Education and Sports at Mugla University. The data were collected by using the Beck Anxiety Inventory, Beck Hopelessness Scale, Automatic Thoughts Scale, and Test Anxiety Inventory. Multiple hierarchical regression analysis was used for explaining anxiety; Pearson Product-Moment Correlation analysis was also employed to search for relationships among all variables. Significant effects of hopelessness, automatic thoughts, and test anxiety, on anxiety were detected.
Perturbation-Response Scanning Reveals Ligand Entry-Exit Mechanisms of Ferric Binding Protein
Canan Atilgan ,Ali Rana Atilgan
PLOS Computational Biology , 2009, DOI: 10.1371/journal.pcbi.1000544
Abstract: We study apo and holo forms of the bacterial ferric binding protein (FBP) which exhibits the so-called ferric transport dilemma: it uptakes iron from the host with remarkable affinity, yet releases it with ease in the cytoplasm for subsequent use. The observations fit the “conformational selection” model whereby the existence of a weakly populated, higher energy conformation that is stabilized in the presence of the ligand is proposed. We introduce a new tool that we term perturbation-response scanning (PRS) for the analysis of remote control strategies utilized. The approach relies on the systematic use of computational perturbation/response techniques based on linear response theory, by sequentially applying directed forces on single-residues along the chain and recording the resulting relative changes in the residue coordinates. We further obtain closed-form expressions for the magnitude and the directionality of the response. Using PRS, we study the ligand release mechanisms of FBP and support the findings by molecular dynamics simulations. We find that the residue-by-residue displacements between the apo and the holo forms, as determined from the X-ray structures, are faithfully reproduced by perturbations applied on the majority of the residues of the apo form. However, once the stabilizing ligand (Fe) is integrated to the system in holo FBP, perturbing only a few select residues successfully reproduces the experimental displacements. Thus, iron uptake by FBP is a favored process in the fluctuating environment of the protein, whereas iron release is controlled by mechanisms including chelation and allostery. The directional analysis that we implement in the PRS methodology implicates the latter mechanism by leading to a few distant, charged, and exposed loop residues. Upon perturbing these, irrespective of the direction of the operating forces, we find that the cap residues involved in iron release are made to operate coherently, facilitating release of the ion.
Algorithm stickiness and the memory extent delimit the rationality of El Farol attendees
Canan Atilgan,Ali Rana Atilgan
Physics , 2007,
Abstract: Arthur's paradigm of the El Farol bar for modeling bounded rationality and inductive behavior is undertaken. The memory horizon available to the agents and the selection criteria they utilize for the prediction algorithm are the two essential variables identified to represent the heterogeneity of agent strategies. The latter is enriched by including various rewarding schemes during decision making. Though the external input of comfort level is not explicitly coded in the algorithm pool, it contributes to each agent's decision process. Playing with the essential variables, one can maneuver the overall outcome between the comfort level and the endogenously identified limiting state. Furthermore, we model the behavior of the agents through the use of an expression that scores the local attendance states available to the agents. It incorporates a single parameter that weighs the relative contributions that originate from the external and internal limiting factors. Solving this expression analytically as well as numerically using the Metropolis Monte-Carlo technique enables us to attribute statistical-thermodynamical meanings to the essential variables identified with the agent-based model, and to gain physical insight to the bounds observed in the behavior of the agents. The power of the analytical approach is validated by obtaining a one-to-one correspondence between the agent-based model and the analytical approach within a wide range of thresholds using a single parameter for a given selection criterion. The origin of discrepancies between the two models appearing at extreme thresholds is tracked to the shifts in the distributions of algorithm types actively utilized by the adaptive agents.
FPGA Implementable Frame Synchronization Algorithm for Burst Mode GMSK  [PDF]
Onur Berkay Gamgam, Erdinc Levent Atilgan
Communications and Network (CN) , 2017, DOI: 10.4236/cn.2017.91005
Abstract: In time division multiple access (TDMA) communication systems, correctly estimating the synchronization parameters is very important for reliable data transfer. The algorithms used for frequency/phase and symbol timing estimates are generally accepted as knowing the start of signal (SoS) parameter. Therefore, within these parameters, the SoS parameter is of particularly great importance. In this study, a reduced version of the SoS estimation algorithm introduced by Hosseini and Perrins is presented to estimate SoS for Gaussian Minimum Shift Keying (GMSK) modulated signals in burst format over additive white Gaussian noise (AWGN) channels. The reduced algorithm can be implemented on FPGA by using half the number of complex multipliers that would be required by the double correlation method and is robust to carrier frequency/phase errors. Simulations performed under 0.1 normalized frequency offset conditions show that the proposed algorithm has a probability of false lock which is less than 7×10-2, even at 0 dB SNR level.
Water Quality and Phytoplankton Diversity in Büyükçekmece Watershed, Turkey  [PDF]
Yasemin Gulecal, Mustafa Temel
Journal of Water Resource and Protection (JWARP) , 2014, DOI: 10.4236/jwarp.2014.61009

Seasonal changes in the diversity of phytoplankton and its relationships to the water quality in Büyükcekmece Watershed in Istanbul, Turkey were studied in this study during one-year period, from January 2009 to December 2009. Physico-chemical parameters, main criteria of water quality, were observed. Having identified species from 6 divisions, including Bacillariophyta, Chlorophyta, Cyanophyta, Euglenophyta, Dinophyta and Cryptophyta within the phytoplankton of Büyükcekmece Lake, and that of the named influent streams, Bacillariophyta among these divisions has been specified as the richest group in species variety. Among the streams having gone under sampling, Tahtakoprü Stream has displayed the species variety (48), and respectively Karasu (45), Hamza Stream (32), Beylikcayiri Stream (21) and Ahlat Stream (7) have come thereafter. Within the phytoplankton of Büyükcekmece Lake, 66 species have been identified. It was determined that the water qualities of Büyükcekmece Lake and related streams were varies I, II and III.

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