Research Outputs

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    Applications in cognitive psychology
    (Turkish Psychologists assoc, 1996) Department of Psychology; Gülgöz, Sami; Faculty Member; Department of Psychology; College of Social Sciences and Humanities; 49200
    In this article, the applications of cognitive psychology are reviewed. First, the development and the general approach of cognitive psychology are explained. This is followed by the computer models, the interaction of cognitive psychology with computer science and the natural applications such as expert systems. Four areas of applications which are particularly significant for the coming years are explained: age-related changes in cognitive skills, cognitive errors and accidents, educational applications, and autobiographical memory. Following these general ureas of interest, the importance of cognitive psychology for design is emphasized. Finally, the article delineates the use of text processing models to create texts that are more comprehensible and that promote learning.
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    Are technology shocks nonlinear?
    (Cambridge University Press (CUP), 1999) Ashley, Richard A.; Patterson, Douglas M.; Department of Economics; Altuğ, Sumru; Faculty Member; Department of Economics; College of Administrative Sciences and Economics; N/A
    The behavior of postwar real U.S. GNP, the inputs to an aggregate production function, and several formulations of the associated Solow residuals for the presence of nonlinearities in their generating mechanisms are examined. Three different statistical tests for nonlinearity are implemented: the McLeod-Li test, the BDS test, and the Hinich bicovariance test. We find substantial evidence for nonlinearity in the generating mechanism of real CNP growth but no evidence for nonlinearity in the Solow residuals. We further find that the generating mechanism of the labor input series is nonlinear, whereas that of the capital services input appears to be linear. We therefore conclude that the observed nonlinearity in real output arises from nonlinearities in the labor markets, not from nonlinearities in the technical shocks driving the system. Finally, we investigate the source of the nonlinearities in the labor markets by examining simulated data from a model of the Dutch economy with asymmetric adjustment costs.
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    Autonomous-related self: a new synthesis
    (Turkish Psychologists Assoc, 1996) N/A; Department of Psychology; Kağıtçıbaşı, Çiğdem; Faculty Member; Department of Psychology; College of Social Sciences and Humanities; N/A
    Two dimensions in interpersonal relations call be observed in many theories. One of these dimensions consists of relatedness and separateness while the second dimension consists of active and passive. Relatedness and autonomy are generally considered to be opposite concepts but these two concepts may co-exist. When we look at the relationship between autonomy and family structure, modernization theory claims that relatedness decreases with modernization. In the approach explained here, self can be both autonomous and related.
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    Crystal structure of tetrasodium octastrontium catena-[octaphosphido(3-)]-[diphosphido(4-)]tetraaluminate(III) [diphosphide(4-)], Na4Sr8[Al4P8(P-2)][P-2]
    (Oldenbourg Verlag, 1998) Carrillo-Cabrera, Wilder; Peters, Karl; von Schnering, Hans Georg; Department of Chemistry; Somer, Mehmet Suat; Faculty Member; Department of Chemistry; College of Sciences; 178882
    N/A
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    Cyclic scheduling in flow lines: modeling observations, effective heuristics and a cycle time minimization procedure
    (Wiley-Blackwell, 1996) Kouvelis, Panagiotis; Department of Business Administration; Karabatı, Selçuk; Faculty Member; Department of Business Administration; College of Administrative Sciences and Economics; 38819
    In this paper we address the cyclic scheduling problem in flow lines. We develop a modeling framework and an integer programming formulation of the problem. We subsequently present exact and approximate solution procedures. The exact solution procedure is a branch-and-bound algorithm which uses Lagrangian and station-based relaxations of the integer programming formulation of the problem as the lower bounding method. Our heuristic procedures show a performance superior to the available ones in the literature. Finally, we address the stability issue in cyclic scheduling, demonstrate its relationship to the work-in-progress inventory control of a flow line, and present a very simple procedure to generate stable schedules in flow lines
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    PublicationOpen Access
    Dimerization of pyrrole
    (TÜBİTAK, 1998) Yurtsever, Mine; Department of Chemistry; Yurtsever, İsmail Ersin; Faculty Member; Department of Chemistry; College of Sciences; 7129
    Accurate ab-inito quantum mechanical calculations of pyrrole dimers are reported. The thermodynamical stabilities of dimers with alpha - alpha, alpha -beta, and beta - beta type linkages are compared in order to predict the possibilities of branching in polypyrroles. Calculations employing large basis sets and including electron correlation effects predict the alpha - alpha dimers as the most stable form. However, an alpha - beta type bonding requires only 1.5-2.0 kcal/mol, and the energy necessary to introduce a beta - beta type bond is 3.6-4.0 kcal/mol. These values show that a high degree of branching is possible even at room temperatures.
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    Double-faced state: political patronage and the consolidation of democracy in Turkey
    (Frank Cass Co Ltd, 1998) Heper, Metin; Department of International Relations; Keyman, Emin Fuat; Faculty Member; Department of International Relations; College of Administrative Sciences and Economics; 45389
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    Effects of workforce integration on immigrants' psychological well-being and adaptation
    (Turkish Psychologists assoc, 1999) Department of Psychology; Aycan, Zeynep; Faculty Member; Department of Psychology; College of Social Sciences and Humanities; 5798
    in this study, unemployment and economic integration, which are among the most important topics of industrial and organizational psychology, were examined in relation to acculturation. Participants were 110 Turkish immigrants to Canada. Despite high educational attainments, two-thirds of the sample were either unemployed or underemployed. there were three main objectives in this study. First, the study aimed at examining the relationships among employment difficulties, psychological well-being and adaptation. the conceptual model of the study was tested using LISREL VIII which confirmed that there were positive relationships among workforce integration, psychological wellbeing and adaptation. Second, the study examined the predictors of the three components of adaptation, namely psychological, socio-cultural and economic. Status loss, relative status, and acculturative stress predicted psychological adaptation; self-concept, Alienation, and personality predicted socio-cultural adaptation; status loss, relative status, unemployment, and migration motivation predicted economic adaptation. the final objective of this study was to explore the ways in which acculturation attitudes of Turkish immigrants influenced the relationships among employment difficulties psychological well-being and adaptation. Results showed that 'integration' and 'separation' were the most preferred acculturation attitudes among Turkish immigrants. Moderated multiple regression analyses revealed that acculturation attitudes helped immigrants cope with stressful life events resulting from employment difficulties.
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    Tetrarubidium nonagermanide(4-) ethylenediamine, Rb-4[Ge-9][en]
    (Wiley, 1998) Carrillo-Cabrera, Wilder; Peters, Eva Maria; Peters, Karl; von Schnering, Hans Georg; Department of Chemistry; Somer, Mehmet Suat; Faculty Member; Department of Chemistry; College of Sciences; 178882
    Orange crystals of Rbd(4)[Ge-9][en] are obtained after the exchange reaction of a solution of 'NaGe2.25' (precursor) in ethylenediamine (en) with solid RbI at 363 K, followed by slow cooling. The compound is very sensitive to oxidation and hydrolysis. The thermal decomposition in dynamic vacuum starts at 350 K with the complete loss of en followed by the sublimation of Rb in four steps (Rb8Ge25, Rb8Ge44, RbxGe136 with x less than or equal to 16, Ge). The Raman spectrum shows the characteristic bands of the [Ge-9](4-) anion (151, 163, 185 and 222 cm(-1)). Rb-4[Ge-9][en] crystallizes in a new structure type (space group P2(1)/m; a=15.353 Angstrom, b = 16.434 Angstrom, c = 15.539 Angstrom, beta =113.75 degrees; Z = 6; Pearson code mP198-40), which can be described as a hierarchical derivative of the structures of Al4YbMo2 and CrB4 (initiators) formed by partial atom-to-aggregate replacement: B-4[square 1][Cr] (=) over cap Al-4[Yb][Mo](2) (=) over cap Rb-4[Ge-9][en](1-2). Three crystal lographic independent [Ge-9](4-) clusters with different orientations are embedded in a Lt-connected 46(5) net formed by the Rb atoms, a network of condensed tetraasteranes. The clusters are distorted monocapped tetragonal antiprisms with D-1(Ge-Ge) = 2.57 Angstrom (16 x) and D-2(Ge-Ge) = 2.84 Angstrom (4x). The atoms of clusters with D1 and D2 lie at the surface of a rotational ellipsoid (a=b=2.136 Angstrom, c=2.431 Angstrom). The en molecules are located in open channels along [(1) over bar 0 1]. The coordinations [Ge-9] Rb-12/14 and Rb [Ge-9](4/12) en(2/8) show that the first step of solvation do not separate the cations from the cluster anions.
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    The [Sn-5](2-) cluster compound [K-(2,2,2-crypt)](2)Sn-5 - Synthesis, crystal structure, Raman spectrum, and hierarchical relationship to CaIn2
    (Wiley, 1999) Carrillo-Cabrera, Wilder; Peters, Eva-Maria; Peters, Karl; Kaupp, Martin; von Schnering, Hans Georg; Department of Chemistry; Somer, Mehmet Suat; Faculty Member; Department of Chemistry; College of Sciences; 178882
    Dark red crystals of [K-(2,2,2)-crypt)](2)Sn-5 precipitate after the reaction of (2,2,2)-crypt with a solution of K1.33Sn in liquid ammonia at room temperature. The compound is sensitive to oxidation and hydrolysis. The sequence of Raman bands (104, 120, 133 and 180 cm(-1)) is characteristic for the trigonal bipyramidal closo-[Sn-5](2-) cluster anion. The wave numbers correspond with the data from Hartree-Fock calculations (114, 128, 142 and 187 cm(-1)). The compound crystallizes trigonally (a = 11.736 Angstrom, c = 22.117 Angstrom, Z = 2, space group (No. 165); Pearson code hP262), isotypic with [Na-(2,2,2)-crypt)](2)Pb-5. The atoms of the cluster show strange anisotropic displacements, which are perfectly reducible to a helical rigid-body motion around and along [001] (libration: +/-9.5 degrees; translation +/-0.29 Angstrom). The structure can be described as a hierarchical derivative of the initiator CaIn2 (P6(3)/mmc, hP6), generated by an atom-to-aggregate replacement: [Ca][In](2) = [Sn-5][K @ C36H72N4O12](2). Thus, the distribution of the [Sn-5](2-) Zint1 anions is hexagonal primitive, and the cation complexes are located close to the centers of trigonal superprisms formed by Sn5 clusters.