Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection

Permanent URI for this collectionhttps://hdl.handle.net/20.500.14365/3

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Now showing 1 - 20 of 3710

Citation - WoS: 14
Citation - Scopus: 19
Deadhead Trip Minimization in City Bus Transportation: a Real Life Application
(Svenciliste U Zagrebu, Fakultet Prometnih Znanosti, 1970-01-01) Nasibov, Efendi; Eliiyi, Ugur; Ertac, Mefharet Ozkilcik; Kuvvetli, Umit
The quality of public transportation services is one of the most important performance indicators of modern urban policies for both planning and implementation aspects. Therefore, along with the size of the city, the significance of appropriate cost evaluation and optimization of all related transportation activities increases as well. One of the most important cost factors for the public transport agencies is naturally the fuel consumption of the vehicles. In this study, the attention is focused on the metropolitan bus transport service. The specific aim is to minimize a significant portion of total fuel utilization that occurs due to the so called deadhead trip or dead mileage, which is defined as the idle distance covered by the vehicle between the garage and the route terminal stops without carrying any passengers. In this study, the results of four mathematical models for minimizing the total deadhead trip distance covered in city bus services of Izmir are presented. The models vary due to the inclusion of garage capacity restrictions or operator distinction for supporting both operational and strategical decisions. All models are applied to the recent bus schedule data, which consist of 293 routes, 1,424 buses and 10 garages, for obtaining the optimal route bus-garage allocations and garage capacities. The results of the Decentralized-Capacitated model, which is appropriate for quick implementation, promise a 7.8% reduction in total dead mileage. While on the other hand, if all garage capacities can be expanded and the bus service is maintained only by one operator as modelled in the Centralized-Uncapacitated case, even a 31.4% improvement is possible in the long term. The environmental gains as well as the financial benefits to be achieved when the solutions are actually implemented, justify the practical contribution of the study.
Citation - Scopus: 1
Cumulative Interarrival Time Distributions of Freeway Entrance Ramp Traffic for Traffic Simulations
(Svenciliste U Zagrebu, Fakultet Prometnih Znanosti, 1970-01-01) Oner, Erdinc
Cumulative interarrival time (IAT) distributions for signalized and non-signalized freeway entrance ramps were developed to be used in digital computer traffic simulation models. The data from four different non-signalized entrance ramps (three ramps with a single lane, one ramp with two lanes) and two different signalized entrance ramps (both with a single lane) were used for developing the cumulative IAT distributions. The cumulative IAT distributions for the signalized and non-signalized entrance ramps were compared with each other and with the cumulative IAT distributions of the lanes for freeways. The comparative results showed that the cumulative IAT distributions for non-signalized entrance ramps are very close to the leftmost lane of a 3-lane freeway where the maximum absolute difference between the cumulative IAT distribution of the leftmost lane of a 3-lane freeway and the entrance ramps cumulative IAT distribution was 3%. The cumulative IAT distribution for the signalized entrance ramps was found to be different from the non-signalized entrance ramp cumulative IAT distribution. The approximated cumulative IAT distributions for signalized and non-signalized entrance ramp traffic for any hourly traffic volume from a few vehicles/hour up to 2,500 vehicles/hour can be obtained at http://www.ohio.edu/orite/research/uitds.cfm.
Citation - WoS: 19
Citation - Scopus: 20
The Sarmanov Family and Its Generalization
(South African Statistical Assoc, 2001) Bairamov, I; Kotz, S; Gebizlioglu, OL
A general class of bivariate distributions is introduced. This class includes the so-called San-nanov-Lee class (and consequently the Farlie-Gumbel-Morgenstern class). It is shown that using procedures described in the paper it is possible to construct distributions of the FGM form for which the correlation coefficient between the marginals can achieve values close to +/-0.6.
Citation - Scopus: 4
Changing World Trade Conditions Force the Turkish Textile and Apparel Industry To Create New Strategies
(2002) Ercan E.
Textile and clothing industry has played an important role in the industrialisation process and market orientation of the Turkish Economy. The yarn making, cloth manufacturing, garment finishing, and related activities presently make up over 6% of the gross national product, 17.5% of industrial production, around 19% of total industrial manufactured goods, 21% of employment. The Turkish apparel industry is currently transitioning from a volume oriented, cost-based contractor role in the global apparel industry to assume more value-added activities such as design and product development. The goal of Turkish apparel manufacturers in this transition is to capitalise on their experience, skilled labour, and technological advantages to establish new markets for high quality, Turkish-designed apparel.
Citation - WoS: 10
Citation - Scopus: 10
Special Precovers in Cotorsion Theories
(Cambridge Univ Press, 2002-06) Akinci, Karen D.; Alizade, R
A cotorsion theory is defined as a pair of classes Ext-orthogonal to each other. We give a hereditary condition (HC) which is satisfied by the (flat, cotorsion) cotorsion theory and give properties satisfied by arbitrary cotorsion theories with an HC. Given a cotorsion theory with an HC, we consider the class of all modules having a special precover with respect to the first class in the cotorsion theory and show that this class is closed under extensions. We then raise the question of whether this class is resolving or coresolving.
Citation - WoS: 77
Citation - Scopus: 83
Dependence Structure and Symmetry of Huang-Kotz Fgm Distributions and Their Extensions
(Physica-Verlag Gmbh & Co, 2002-07-01) Bairamov I.; Kotz, S
An extension of FGM class of bivariate distributions with given marginals is presented. For Huang-Kotz FGM distributions some theorems characterizing symmetry and conditions for independence are obtained. The new family of distributions allows us to achieve correlation between the components greater than 0.5.
Citation - WoS: 20
Citation - Scopus: 23
A New Measure of Linear Local Dependence
(Taylor & Francis Ltd, 2003-04) Bairamov, I; Kotz, S; Kozubowski, TJ
A new local dependence function based on regression concepts is introduced. This function can characterize the dependence structure of two random variables localized at the fixed point. Some properties of the local dependence function are given. Examples of important bivariate distributions are provided.
Citation - WoS: 11
Citation - Scopus: 11
On a New Sample Rank of an Order Statistics and Its Concomitant
(Elsevier Science Bv, 2003-06) Eryılmaz, Serkan; Bairamov, IG
The marginal and joint distributions of the new sample rank of an order statistic and its concomitant are derived. (C) 2003 Elsevier Science B.V. All rights reserved.
Micro-G Architecture - an Innovative Design and Education Experience in Turkey
(American Society of Civil Engineers (ASCE), 2004-03-03) Wilsing M.; Anilir S.; Wılsıng, Nil
This paper aims to introduce the space architecture education at Bilkent University in Turkey. Architecture and engineering have common interests in Earth infrastructure development; as the space, considered as a new and challenging environment can help the students to undertake difficult tasks in developing space stations and various space structures for habitation purposes.
Citation - Scopus: 2
The Longest Run Statistic Associated With Exchangeable Binary Variables
(2005) Eryilmaz S.
Since the hydrologic risk is defined as a risk of exceedance of a critical level during a period, the number of the longest successive exceedances which is referred to as the longest run statistic shows the length of the longest hydrologic risk period. This paper is concerned with the longest run statistic associated with exceedances. In the derivation of a binary sequence, an independent sequence of random variables and a random threshold are considered. The elements of a binary sequence are assigned with respect to a random threshold. In such a consideration, the elements of the corresponding binary sequence are not independent, but are symmetrically dependent, i.e. exchangeable. The distribution of the longest run statistic is derived for the sequence of exchangeable binary variables and its hydrological use is discussed. © Tübi?tak.
Citation - WoS: 1
Singular Integrals of the Time-Harmonic Relativistic Dirac Equation on a Piecewise Liapunov Surface
(Texas State Univ, 2005) Schneider, Baruch
We give a short proof of a formula of Poincare-Bertrand in the setting of time-harmonic solutions of the relativistic Dirac equation on a piecewise Liapunov surface, as well as for some versions of quaternionic analysis.
Citation - Scopus: 9
On Characteristic Properties of the Uniform Distribution
(2005) Arslan G.; Ahsanullah M.; Bairamov, I. G.
In this paper two characterizations of the uniform distribution using record values will be considered. The first characterization is based on the relation XU(m) - XU(m-1)d = XL(m), m > 1, where XU(m) and XL(m) denote the mth upper and lower record values, respectively. The second characterization involves the second record range. © 2005, Indian Statistical Institute.
Citation - WoS: 21
Citation - Scopus: 22
On the Distribution and Expectation of Success Runs in Nonhomogeneous Markov Dependent Trials
(Springer, 2005-01) Eryılmaz, Serkan
The number of success runs for nonhomogeneous markov dependent trials are represented as the sum of Bernoulli trials and the expected value of runs are obtained by using this representation. The distribution and bounds for the distribution of the longest run are derived for markov dependent trials.
Citation - WoS: 4
Citation - Scopus: 4
Exactly Solvable Pairing Model Using an Extension of the Richardson-Gaudin Approach
(World Scientific Publ Co Pte Ltd, 2005-02) Balantekin, AB; Dereli, T; Pehlivan, Y
We introduce a new class of exactly solvable boson pairing models using the technique of Richardson and Gaudin. Analytical expressions for all energy eigenvalues and the first few energy eigenstates are given. In addition, another solution to Gaudin's equation is also mentioned. A relation with the Calogero-Sutherland model is suggested.
Citation - WoS: 70
Citation - Scopus: 86
A Note on the Mean Residual Life Function of a Parallel System
(Taylor & Francis Inc, 2005-02-01) Asadi, M; Bayramoğlu, İ.
One of the most important types of system structures is the parallel structure. In the present article, we propose a definition for the mean residual life function of a parallel system and obtain some of its properties. The proposed definition measures the mean residual life function of a parallel system consisting of n identical and independent components under the condition that n - i, i = 0, 2,..., n - 1, components of the system are working and other components of the system have already failed. It is shown that, for the case where the components of the system have increasing hazard rate, the mean residual life function of the system is a nonincreasing function of time. Finally, we will obtain an upper bound for the proposed mean residual life function.
Citation - WoS: 9
Citation - Scopus: 8
On the General Class of Two-Sided Power Distribution
(Taylor & Francis Inc, 2005-05) Ozlem, OE; Bairamov, I
Van Dorp and Kotz ( 2003) introduced a general class of two-sided power distribution. We provide several examples of this distribution by considering a non negative, non decreasing differentiable function g on [0, 1] satisfying g (1) - g(0) = 1. For the considered distributions the maximum likelihood estimation and moment estimation of parameters are obtained. Moments, moment generating functions, and relative entropy are also derived.
Citation - WoS: 11
Citation - Scopus: 12
Solutions of the Gaudin Equation and Gaudin Algebras
(Iop Publishing Ltd, 2005-06-08) Balantekin, AB; Dereli, T; Pehlivan, Yamac
Three well-known solutions of the Gaudin equation are obtained under a set of standard assumptions. By relaxing one of these assumptions, we introduce a class of mutually commuting Hamiltonians based on a different solution of the Gaudin equation. Application of the algebraic Bethe ansatz technique to diagonalize these Hamiltonians reveals a new infinite-dimensional complex Lie algebra.
Citation - Scopus: 1
The Rebirth of the Ottoman Committee of Union and Progress in Macedonia Through the Italian Freemasonry
(Brill Academic Publishers, 2005-08-12) Ozen O.A.-C.
[No abstract available]
Citation - WoS: 15
Citation - Scopus: 17
Concomitants in a Sequence of Independent Nonidentically Distributed Random Vectors
(Taylor & Francis Inc, 2005-10) Eryılmaz, Serkan
Concomitants of order statistics are considered for the situation in which the random vectors (X-1, Y-1), (X-2, Y-2), . . . , (X-n, Y-n) are independent but otherwise arbitrarily distributed. The joint and marginal distributions of the concomitants of order statistics and stochastic comparisons among the concomitants of order statistics are studied in this situation.
Citation - WoS: 10
Citation - Scopus: 14
A Characterization of Continuous Distributions Via Regression on Pairs of Record Values
(Wiley, 2005-11-25) Bairamov I.; Ahsanullah, M; Pakes, AG
The exponential type is characterized in terms of the regression of a ( possibly non-linear) function of a record value with its adjacent record values as covariates. Monotone transformations extend this result to more general settings, and these are illustrated with some specific examples.

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