Sürdürülebilir Yeşil Kampüs Koleksiyonu / Sustainable Green Campus Collection
Permanent URI for this collectionhttps://hdl.handle.net/11147/7755
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Article An Application With Webmathematica(Springer Verlag, 2003) Ufuktepe, ÜnalThere have been many technological dawns in the last 30 years, during which the desktop computer and the Internet have been developed. The importance of Internet in education, particularly using its Web is a well-recognized fact. A wealth of resources and techniques now exist which serve as a source both for exciting examples of new teaching practices, as well as easily accessible methods for adoption into various formats of teaching and learning. Internet technology allow teachers and students keep up with their minds. It let them try their ideas as soon as they come up with them. Generally, students appreciate the convenience, choice, and flexibility that an online courses offers. Instructional designers value the standardized framework and flexibility. WebMathematica is a web-based technology developed by Wolfram Research that allows the generation of dynamic web content with Mathematica. With this technology, the distance education students should be able to explore and experiment with the mathematical concepts. In this paper we will elucidate the pedagogical issues in the application of Hamiltonian systems in the webMathematica for the distance learning environment and the shape of the future "classroom" as well as relevant educational strategies towards improving mathematics education.Article Citation - WoS: 15Citation - Scopus: 17Genetic Algorithm-Based Discharge Estimation at Sites Receiving Lateral Inflows(American Society of Civil Engineers (ASCE), 2009) Tayfur, Gökmen; Barbetta, Silvia; Moramarco, TommasoThe genetic algorithm (GA) technique is applied to obtain optimal parameter values of the standard rating curve model (RCM) for predicting, in real time, event-based flow discharge hydrographs at sites receiving significant lateral inflows. The standard RCM uses the information of discharge and effective cross-sectional flow area at an upstream station and effective cross-sectional flow area wave travel time later at a downstream station to predict the flow rate at this last site. The GA technique obtains the optimal parameter values of the model, here defined as the GA-RCM model, by minimizing the mean absolute error objective function. The GA-RCM model was tested to predict hydrographs at three different stations, located on the Upper Tiber River in central Italy. The wave travel times characterizing the three selected river branches are, on the average, 4, 8, and 12h. For each river reach, seven events were employed, four for the model parameters' calibration and three for model testing. The GA approach, employing 100 chromosomes in the initial gene pool, 75% crossover rate, 5% mutation rate, and 10,000 iterations, made the GA-RCM model successfully simulate the hydrographs observed at each downstream section closely capturing the trend, time to peak, and peak rates with, on the average, less than 5% error. The model performance was also tested against the standard RCM model, which uses, on the contrary to the GA-RCM model, different values for the model parameters and wave travel time for each event, thus, making the application of the standard RCM for real time discharge monitoring inhibited. The comparative results revealed that the RCM model improved its performance by using the GA technique in estimating parameters. The sensitivity analysis results revealed that at most two events would be sufficient for the GA-RCM model to obtain the optimal values of the model parameters. A lower peak hydrograph can also be employed in the calibration to predict a higher peak hydrograph. Similarly, a shorter travel time hydrograph can be used in GA to obtain optimal model parameters that can be used to simulate floods characterized by longer travel time. For its characteristics, the GA-RCM model is suitable for the monitoring of discharge in real time, at river sites where only water levels are observed.Article Citation - WoS: 37Citation - Scopus: 49Predicting Suspended Sediment Loads and Missing Data for Gediz River, Turkey(American Society of Civil Engineers (ASCE), 2009) Ülke, Aslı; Tayfur, Gökmen; Özkul, SevinçPrediction of suspended sediment load (SSL) is important for water resources quantity and quality studies. The SSL of a stream is generally determined by direct measurement of the suspended sediment concentration or by employing sediment rating curve method. Although direct measurement is the most reliable method, it is very expensive, time consuming, and, in many instances, problematic for inaccessible sections, especially during floods. On the other hand, measuring precipitation and flow discharge is relatively easier and hence, there are more rain and flow gauging stations than SSL gauging stations in Turkey. Furthermore, due to its cost, measurements of SSL are carried out in longer periods compared to precipitation and flow measurements. Although daily precipitation and flow measurements are available for most of the Turkish river basins, at best semimonthly measurements are available for SSL. As such, it is essential to predict SSL from precipitation and flow data and to fill the gap for the missing data records. This study employed artificial intelligence methods of artificial neural networks (ANN) and neurofuzzy inference system, the sediment rating curve method, multilinear regression, and multinonlinear regression methods for this purpose. The comparative analysis of the results showed that the artificial intelligence methods have superiority over the other methods for predicting semimonthly suspended sediment loads. The ANN using conjugate gradient optimization method showed the best performance among the proposed models. It also satisfactorily generated daily SSL data for the missing period record of Gediz River, Turkey.Conference Object Citation - Scopus: 15Thomas Sharp's Collaboration With H. De C. Hastings: the Formulation of Townscape as Urban Design Pedagogy(Routledge, 2009) Erten, ErdemThis paper focuses on the collaboration between the Architectural Review's (AR) chief editor and proprietor Hubert de Cronin Hastings (1902-1986) and planner Thomas Sharp (1901-1978) in the formulation and dissemination of Townscape as urban design pedagogy in the period between 1935 and 1955. This pedagogy proved effective in questioning the modernist planning attitude defined by the CIAM congresses and the prevalent Garden City mentality of the New Town proposals during post-World War II reconstruction efforts. Growing out of the shared interests and ideological affinities of the people engaged in British post-war reconstruction, 'Townscape' emerged as the result of a collective effort of those affiliated with Hastings for which Nikolaus Pevsner, Thomas Sharp and Gordon Cullen assumed major roles. If the Architectural Press has been the linchpin of this propagation by several books including those by Sharp and the articles published within AR, Sharp's role as a practicing planning consultant was influential, but more importantly institutional in disseminating 'Townscape'. The intermittent collaboration between Hastings and Sharp was a part of Hastings's unrelenting effort in conceptualizing a model of environmental intervention linked to ideals of cultural continuity. Townscape series remained a part of AR during Hastings's editorial reign for more than a quarter century, repeating the same message for different contextual cases as an instrument of teaching its readers how to perceive, visualize and intervene into the urban environment, as much as Townscape was an inseparable component of Sharp's career as planner, lecturer and author that established precedents for many planners to follow.Article Citation - WoS: 5Citation - Scopus: 5Kinematic Wave Theory for Transient Bed Sediment Waves in Alluvial Rivers(American Society of Civil Engineers (ASCE), 2008) Singh, Vijay P.; Tayfur, GökmenTransient bed sediment waves in alluvial rivers have been described using a multitude of hydraulic formulations. These formulations are based on some form of the St. Venant equations and conservation of mass of sediment in suspension and in bed. Depending on the assumptions employed, a hierarchy of formulations is expressed. These formulations in the literature employ uncoupled, semicoupled, or fully coupled transport models treating the sediment waves as either hyperbolic (dynamic wave) or parabolic (diffusion wave). It is, however, hypothesized that the movement of bed sediment waves in alluvial rivers can be described as a kinematic wave. Kinematic wave theory employs a functional relation between sediment transport rate and concentration and a relation between flow velocity and depth. This study summarizes the hierarchy of the formulations while emphasizing the kinematic wave theory for describing transient bed sediment waves. The applicability of the theory is shown for laboratory flume data and hypothetical cases.Article Citation - Scopus: 4Postwar Visions of Apocalypse and Architectural Culture: the Architectural Review's Turn To Ecology(Taylor and Francis Ltd., 2008) Erten, ErdemIn the post-war era, Hubert de Cronin Hastings, the owner and editor (until 1971) of the English periodical The Architectural Review (AR), saw mankind facing its demise through its own scientific creation, the atom bomb. Hastings's editorial policies for the AR were very much influenced by the prospect of impending nuclear disaster during the Cold War and the decline of the British Empire in a world divided into the mandates of two superpowers. While the post-war period brought mistrust of the promise of emancipation through technology and science for those like Hastings, for others there was all the more reason to believe in these ideals with the dawning of a consumerist society and the development of pop culture. Within this cultural context AR aimed to develop and sustain an environmental culture as a holistic strategy in order to respond to planning problems. Targeting not only architects but local and national authorities as well as the 'man on the street', AR launched a series of campaigns that aimed to increase environmental awareness against post-war industrial transformation and the rise of consumerism. After the decline of the affluent consumer society of the 1960s and the devaluation of the pound in 1967, AR revamped its structure and contents and launched its 'Manplan' campaign, reacting against economic crisis and environmental decline. Taking issue with 'Non-Plan: An Experiment in Freedom' written by Reyner Banham, Peter Hall, Paul Barker and Cedric Price in New Society in 1969, 'Manplan' demanded centralization and comprehensive planning against decentralization and dispersal as a means of planning democracy. According to the editors, scientific progress enjoined to consumer culture and ever-expanding economic growth brought a ruthless exploitation of resources as well as destruction of the natural landscape. Before the journal itself went into economic crisis and Hastings left the editorial board, the first issue of the pioneering journal The Ecologist themed 'A Blueprint for Survival' was brought on the board's agenda by Hastings. In the light of global warming and increasing rate of environmental disasters today, the history of AR's editorial campaigns deserve renewed interest. This paper focuses on the neo-romantic ideology that underlay the post-war editorial policies of AR motivated by approaching environmental disaster within the continuum of a quarter century.Conference Object Citation - WoS: 6Citation - Scopus: 6A Merging Clustering Algorithm for Mobile Ad Hoc Networks(Springer Verlag, 2006) Dağdeviren, Orhan; Erciyeş, Kayhan; Çokuslu, DenizClustering is a widely used approach to ease implementation of various problems such as routing and resource management in mobile ad hoc networks (MANET)s. We propose a new fully distributed algorithm for clustering in MANETs that merges clusters to form higher level clusters by increasing their levels. We show the operation of the algorithm and analyze its time and message complexities and provide results in the simulation environment of ns2. Our results conform that the algorithm proposed is scalable and has a lower time and message complexities than the other algorithmsConference Object Citation - WoS: 8Citation - Scopus: 13A Distributed Backbone Formation Algorithm for Mobile Ad Hoc Networks(Springer Verlag, 2006) Dağdeviren, Orhan; Erciyeş, KayhanConstruction of a backbone architecture is an important issue in mobile ad hoc networks(MANET)s to ease routing and resource management. We propose a new fully distributed algorithm for backbone formation in MANETs that constructs a directed ring architecture. We show the operation of the algorithm, analyze its message complexity and provide results in the simulation environment of ns2. Our results conform that the algorithm is scalable in terms of its running time and roundtrip delay against mobility, surface area, number of nodes and number of clusterheads.Conference Object E-Calculus at Iztech(Springer Verlag, 2006) Ufuktepe, Ünal; Ufuktepe, Günnur; Deniz, Aslı; Dündar, VeliIn today's new economy, characterized by industrial revolutions, globalization and information technology changes traditional classroom and teaching methods. Calculus is the basic course for the fresher at university. Mathematics has a negative development at universities and colleges. The number of students taking mathematics courses and those successfully passing the exams are rapidly decreasing. To overturn this negative development, it may be necessary to teach in a different way. This is where new technology could play an important role. We create a web browser environment by using the webMathematica, which is a new technology based on Java Server Page, Tomcat and Mathematica, in learning calculus. The modules consist of topic modules linked with case study modules, to help learn calculus and see it in context. The aim of our project is to use new technology to present mathematics on the web, and create a pilot course for students and teachers available free on the web. The heart of our approach is the development of mathematical power: understanding, using, and appreciating mathematics. Students can reach any documents for calculus and solve their problems with webMathematica to check whether their results are correct or not. It is possible to reach our page at the following URL address: http://galois.iyte.edu.tr/calculus.Conference Object Citation - WoS: 1Citation - Scopus: 2A Case Study on Logging Visual Activities: Chess Game(Springer Verlag, 2006) Ozan, Şükrü; Gümüştekin, ŞevketAutomatically recognizing and analyzing visual activities in complex environments is a challenging and open-ended problem. In this study this task is performed in a chess game scenario where the rules, actions and the environment are well defined. The purpose here is to detect and observe a FIDE (Fédération International des Ėchecs) compatible chess board, generating a log file of the moves made by human players. A series of basic image processing operations have been applied to perform the desired task. The first step of automatically detecting a chess board is followed by locating the positions of the pieces. After the initial setup is established every move made by a player is automatically detected and verified. Intel® Open Source Computer Vision Library (OpenCV) is used in the current software implementation.