Arama Sonuçları

Listeleniyor 1 - 10 / 49
  • Yayın
    Positive solutions for a sum-type singular fractional integro-differential equation with m-point boundary conditions
    (Politechnica University of Bucharest, 2017) Aydoğan, Seher Melike; Nazemi, Sayyedeh Zahra; Rezapour, Shahram
    We study the existence and uniqueness of positive solutions for a sum-type singular fractional integro-differential equation with m-point boundary condition. Also, we provide an example to illustrate our main result.
  • Yayın
    God, man, and nature: life for reason and the reason behind the universe - a panentheistic approach to life of pi
    (De Gruyter, 2021-11-08) Edman, Timuçin Buğra; Gözen, Hacer
    This article intends to lay out a comparative study of Karma philosophy and literature scrutinizing Yann Martel's novel Life of Pi through a panentheistic approach. Because Karma is one of the predominant philosophies in the novel and permeates the general atmosphere, this article intends to scrutinize Yann Martel's novel Life of Pi through a panentheistic approach. Although karma is a very complex issue, since anyone committing evil acts can claim to be a mere agent of karma delivering punishment to others for sins they committed in their past lives, it is true that according to karma, our actions have consequences which affect the entirety of our lives, and this can also be seen as free will. Yet while this approach tends to focus on the action and reaction mechanisms of life, the flow of life in the universe should still be carefully contemplated, since if we believe the first story, Pi's survival not only depends on his choices, but also on the opportunities that the universe offers him. In that sense, if we are to accept God as the soul of the universe, then the universal spirit must be omnipresent and omnipotent while also capable of transforming into anything in terms of s panentheistic approach. Thus God, being greater than the universe, is the ultimate force that balances everything, and is also the biggest karma controller. For this reason, this article analyzes Life of Pi from both inductive and deductive slants to demonstrate that all roads lead to God, the omniscient.
  • Yayın
    Construction of a Turkish proposition bank
    (Tubitak Scientific & Technical Research Council Turkey, 2018) Ak, Koray; Toprak, Cansu; Esgel, Volkan; Yıldız, Olcay Taner
    This paper describes our approach to developing the Turkish PropBank by adopting the semantic role-labeling guidelines of the original PropBank and using the translation of the English Penn-TreeBank as a resource. We discuss the semantic annotation process of the PropBank and language-specific cases for Turkish, the tools we have developed for annotation, and quality control for multiuser annotation. In the current phase of the project, more than 9500 sentences are semantically analyzed and predicate-argument information is extracted for 1330 verbs and 1914 verb senses. Our plan is to annotate 17,000 sentences by the end of 2017.
  • Yayın
    Psychometric properties of the pathological buying screener: reliability and validity study
    (Kare Publishing, 2021-06) Dikbaş, Ganime Tuba; Acartürk, Ceren; Akyunus, Miray
    Objective: The Pathological Buying Screener (PBS) is a self-report scale used to evaluate compulsive buying behavior. The aim of this study was to assess the validity and reliability of a Turkish version of the PBS in a nonclinical sample. Method: A total of 457 adult participants aged 18-64 years were enrolled in this study. Internal consistency, test-retest reliability and structure, concurrent and criterion-related predictive validity analyses were conducted to ensure reliability and validity for use of the scale with a Turkish population. As part of the validity study, all of the participants were asked to complete a battery of self-report scales: the Compulsive Buying Scale, the Brief Symptom Inventory, the Rosenberg Self-Esteem Scale, the Barratt Impulsiveness Scale-Short Form, and the PBS. In order to examine the test-retest reliability, 75 participants were asked to complete the questionnaire once again 2 weeks after the first administration. Results: The results of this study revealed that the PBS had good internal consistency and test-retest reliability. The findings supported concurrent and criterion-related predictive validity, and a 2-factor structure, consistent with the original form. Conclusion: The Turkish version of the PBS is a valid and reliable measurement tool that will add to understanding of pathological buying behavior.
  • Yayın
    Co-registration of surfaces by 3D least squares matching
    (Amer Soc Photogrammetry, 2010-03) Akça, Mehmet Devrim
    A method for the automatic co-registration of 3D surfaces is presented. Die method utilizes the mathematical model of Least Squares 2D image matching and extends it for solving the 3D surface matching problem The transformation parameters of the search surfaces are estimated with respect to a template surface. The solution is achieved when the sum of the squares of the 3D Spatial (Euclidean) distances between the surfaces are minimized. The parameter estimation is achieved using the Generalized Gauss-Markov model. Execution level implementation details are given. Apart from the co-registration of the point clouds generated from spacaborne airborne and terrestinal sensors and techniques. the proposed method is also useful for change detection, 3D comparison, and quality assessment tasks Experiments, terrain data examples show file capabilities of the method.
  • Yayın
    Normative data and factorial structure of the Turkish version of the junior temperament and character inventory-revised
    (Taylor & Francis, 2017) Köse, Samet; Çam Çelikel, Feryal; Akın, Ercan; Kaya, Cahit; Elbozan Cumurcu, Birgül; Etikan, İlker; Cloninger, Claude Robert
    Objective: Junior Temperament and Character Inventory (J-TCI) was developed by Luby, Svrakic, McCallum, Przybeck, and Cloninger based on Cloninger's biopsychosocial model to assess temperament and character dimensions in children and adolescents. Methods: The Turkish version of J-TCI-Revised (J-TCI-R) was administered to 1129 elementary and middle-school (male/female, 546/583) students. Internal consistency reliabilities were measured by Cronbach's alpha; test-retest was assessed across one month. Results: Cronbach's alphas for the subscales of J-TCI-R ranged from 0.60 to 0.75 for temperament and character subscales, which were comparable to US and other populations. The correlations between baseline and one month after administration of J-TCI-R were highly and statistically significant (r = 0.578-0.674 for scales and 0.366-0.582 for subscales) (n = 795). Factor analysis results using Eigenvalue greater than one rule indicated three out of four factors for temperament scales and one out of two factors for character subscales which were similar to findings from the other countries. When all of the subscales were subjected to factor analysis, four out of six factors were retained. To our knowledge, this is the first study analysing psychometric properties and factorial construct of the J-TCI-R. Conclusions: The internal reliability coefficients and test-retest indicated a good stability of scores over time and the factorial structure was consistent with Cloninger's model of personality. The reliability and validity of the Turkish version of the TCI is therefore supported.
  • Yayın
    Classification of minimal Lorentzian surfaces in S-2(4) (1) with Constant Gaussian and normal curvatures
    (Mathematical Society of The Repulic Of China, 2016-12) Dursun, Uğur; Turgay, Nurettin Cenk
    In this paper we consider Lorentzian surfaces in the 4-dimensional pseudo Riemannian sphere S-2(4)(1) with index 2 and curvature one. We obtain the complete classification of minimal Lorentzian surfaces S-2(4)(1) whose Gaussian and normal curvatures are constants. We conclude that such surfaces have the Gaussian curvature 1/3 and the absolute value of normal curvature 2/3. We also give some explicit examples.
  • Yayın
    A path loss model for link budget analysis of indoor visible light communications
    (Istanbul Univ-Cerrahpasa, 2021-05) Miramirkhani, Farshad
    In the context of beyond 5G indoor communication systems, visible light communications (VLC) has emerged as a viable supplement for existing radio frequency based systems and as an enabler for high data rate communications. However, the existing indoor VLC systems are limited by detrimental outages caused by fluctuations in the VLC channel gain because of user mobility. In this study, we proposed a tractable path loss model for indoor VLC that reflects the effect of room size and coating material of surfaces. We performed an extensive advanced ray tracing simulation to obtain the channel impulse responses within a room and presented a path loss model as a function of distance, room size, and coating material through curve fitting. In addition, path loss parameters such as the path loss exponent and the standard deviation of the shadowing component were determined. The simulation results indicate that path loss is a linear function of distance, path loss exponent is a function of room size and coating material, and shadowing follows a log normal distribution.
  • Yayın
    A new subspecies of Phoenix theophrasti Greuter (Phoenix theophrasti Greuter subsp. golkoyana Boydak) from Turkey
    (Istanbul Univ-Cerrahpasa, 2019-07) Boydak, Melih
    In the present study, a new subspecies (Phoenix theophrasti Greuter subsp. golkoyana Boydak) is described in Turkey. The unidentified Phoenix taxon native to Bodrum-Golkoy, Aegean Turkey and named as the "Golkoy Phoenix population" has been known to Golkoy's inhabitants for centuries. The Golkoy Phoenix population was considered to be representative of P. theophrasti. Boydak made the first of a number of trips to Golkoy and immediately noticed some distinct differences between the Golkoy Phoenix population, P. theophrasti Greuter, and Phoenix dactylifera L in the early summer of 1990. He continued his investigations on this taxon for many years to shed light on the subject. He made two new trips to the three native stands of P. theophrasti and the Golkoy Phoenix populations in 2015 and 2018. Measurements and observations were made on the morphological characteristics that showed distinct differences among the Golkoy Phoenix population, P. theophrasti, and P. dactylifera. These were related to the length of male stalks and female inflorescences and some fruit and seed characteristics. The results indicate that some distinctive morphological characteristics of the "Golkoy Phoenix population" merit its being described as a new subspecies. "Phoenix theophrasti Greuter subsp. golkoyana Boydak" differs from P. theophrasti Greuter with respect to its longer fruiting-female stalk length and longer male stalk length, its fruiting stalks hold fruits marginally higher, and its having seeds with slightly visible striate surface crust structures and deeper-wider grooves.
  • Yayın
    The statistics of energy states of a Hookean model for proteins
    (TÜBİTAK, 2000) Erzan, Ayşe; Tüzel, Erkan
    A generic model of a random polypeptide chain, with discrete torsional degrees of freedom and Hookean springs connecting pairs of hydrophobia residues, reproduces the energy probability distribution of real proteins over a very large range of energies. We show that this system with harmonic interactions, under dissipative dynamics driven by random noise, leads to a distribution of energy states obeying a modified one-dimensional Ornstein-Uhlenbeck process with reflecting boundary conditions, and giving rise to distributions of the Wigner or inverse Gaussian form. A continuum approximation leads to a path integral formulation of the problem.