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Permanent URI for this collectionhttps://hdl.handle.net/20.500.14288/3
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Publication Metadata only Performance measures for video object segmentation and tracking(IEEE-Inst Electrical Electronics Engineers Inc, 2004) Erdem, Çiğdem Eroğlu; Sankur, Bülent; Department of Electrical and Electronics Engineering; Tekalp, Ahmet Murat; Faculty Member; Department of Electrical and Electronics Engineering; College of Engineering; 26207We propose measures to evaluate quantitatively the performance of video object segmentation and tracking methods without ground-truth (GT) segmentation maps. The proposed measures are based on spatial differences of color and motion along the boundary of the estimated video object plane and temporal differences between the color histogram of the current object plane and its predecessors. They can be used to localize (spatially and/or temporally) regions where segmentation results are good or bad; and/or they can be combined to yield a single numerical measure to indicate the goodness of the boundary segmentation and tracking results over a sequence. The validity of the proposed performance measures without GT have been demonstrated by canonical correlation analysis with another set of measures with GT on a set of sequences (where GT information is available). Experimental results are presented to evaluate the segmentation maps obtained from various sequences using different segmentation approaches.Publication Metadata only The relationship between disease features and quality of life in patients with cancer - I(Lippincott Williams and Wilkins (LWW), 2001) Işıkhan, Vedat; Kömürcü, Şeref; Özet, Ahmet; Arpacı, Fikret; Özturk, Bekir; Güner, Perihan; Faculty Member; School of Nursing; 101859The high incidence and the severe symptoms of cancer have a considerable effect on quality of life in patients. The relationship between quality of life in patients with cancer and treatment, early diagnosis, disease acceptance, pain, psychological distress, loss of organ, duration of disease, and caregivers was investigated. This study included 508 patients with cancer treated in either inpatient or outpatient clinics of 5 oncology centers in Ankara, Turkey, between August 1998 and January 2000. Patients were selected by interviews. Data were collected by a questionnaire to determine disease features and to evaluate patients' quality of life. We found that several disease features, including treatment, early diagnosis, disease acceptance, pain, psychological distress, and caregivers, had an effect on patients' quality of life (P < 0.05), whereas loss of organ and duration of disease did not. The results of this study underline the significant effect of psychosocial care programs on quality of life. In the future, assessments of quality of life can help healthcare personnel to prepare psychosocial care programs.Publication Metadata only Rattling in the cage: Ions as probes of sub-picosecond water network dynamics(American Chemical Society (ACS), 2009) Schmidt, Diedrich A.; Funkner, Stefan; Born, Benjamin P.; Gnanasekaran, Ramachandran; Schwaab, Gerhard W.; Leitner, David M.; Havenith, Martina; Department of Chemistry; Birer, Özgür; Faculty Member; Department of Chemistry; College of Sciences; N/AWe present terahertz (THz) measurements of salt solutions that shed new light on the controversy over whether salts act as kosmotropes (structure makers) or chaotropes (structure breakers), which enhance or reduce the solvent order, respectively. We have carried out precise measurements of the concentrationdependent THz absorption coefficient of 15 solvated alkali halide salts around 85 cm-1 (2.5 THz). In addition, we recorded overview spectra between 30 and 300 cm-1 using a THz Fourier transform spectrometer for six alkali halides. For all solutions we found a linear increase of THz absorption compared to pure water (THz excess) with increasing solute concentration. These results suggest that the ions may be treated as simple defects in an H-bond network. They therefore cannot be characterized as either kosmotropes or chaotropes. Below 200 cm-1, the observed THz excess of all salts can be described by a linear superposition of the water absorption and an additional absorption that is attributed to a rattling motion of the ions within the water network. By providing a comprehensive set of data for different salt solutions, we find that the solutions can all be very well described by a model that includes damped harmonic oscillations of the anions and cations within the water network. We find this model predicts the main features of THz spectra for a variety of salt solutions. The assumption of the existence of these ion rattling motions on sub-picosecond time scales is supported by THz Fourier transform spectroscopy of six alkali halides. Above 200 cm-1 the excess is interpreted in terms of a change in the wing of the water network librational mode. Accompanying molecular dynamics simulations using the TIP3P water model support our conclusion and show that the fast sub-picosecond motions of the ions and their surroundings are almost decoupled. These findings provide a complete description of the solute-induced changes in the THz solvation dynamics for the investigated salts. Our results show that THz spectroscopy is a powerful experimental tool to establish a new view on the contributions of anions and cations to the structuring of water. © 2009 American Chemical Society.Publication Metadata only Erratum: learning to use demonstratives in conversation: what do language specific strategies in Turkish reveal? (vol 33, pg 303, 2006)(Cambridge Univ Press, 2006) N/A; Department of Psychology; Department of Psychology; Küntay, Aylin C.; Özyürek, Aslı; Faculty Member; Faculty Member; Department of Psychology; College of Social Sciences and Humanities; College of Social Sciences and Humanities; 178879; N/AN/APublication Metadata only A new dataset of non-redundant protein/protein interfaces(Biophysical Society, 2003) Tsai, CJ; Wolfson, H; Nussinov, R; Department of Chemical and Biological Engineering; Keskin, Özlem; Faculty Member; Department of Chemical and Biological Engineering; College of Engineering; 26605Publication Metadata only Continuous dependence for the convective brinkman–forchheimer equations(Taylor & Francis, 2005) Çelebi, A.O.; Ugurlu, D.; Department of Mathematics; Kalantarov, Varga; Faculty Member; Department of Mathematics; College of Sciences; 117655In this article, we have considered the convective Brinkman–Forchheimer equations with Dirichlet's boundary conditions. The continuous dependence of solutions on the Forchheimer coefficient in H 1 norm is proved.Publication Metadata only Knowledge processes and learning outcomes in MNCs: an empirical investigation of the role of HRM practices in foreign subsidiaries(Wiley, 2009) Simonin, Bernard L.; Department of Business Administration; Tunalı, Ayşegül Özsomer; Faculty Member; Department of Business Administration; College of Administrative Sciences and Economics; 108158By examining the case of American and European firms operating in Japan, this article contributes to the central debate of how and when multinational corporations (MNCs) learn from their foreign subsidiaries. Through structural equation modeling, we assess how specific human resource management (HRM) practices (critical thinking encouragement, supervisory encouragement, learning incentives, deployment of internal mechanisms and processes, expatriation, and corporate training) enhance (1) knowledge transfer outflows from the subsidiary to other parts of the MNC and (2) the subsidiary's performance in its local market. We find learning orientation to be a key antecedent of all HRM practices we investigated. From a practical point of view, a noticeable finding relates to the lack of effects of critical thinking encouragement on market knowledge acquisition and dissemination when (1) there is a significant presence of expatriates in the subsidiary and (2) when local managers have access to training programs at headquarters (HQ) and other affiliates.Publication Metadata only Cultural models of nature and society reconsidering environmental attitudes and concern(Sage Publications Inc, 2006) N/A; Department of Sociology; Ignatow, Gabriel; Faculty Member; Department of Sociology; College of Social Sciences and Humanities; N/ASocial scientists have long debated the factors influencing public concern for the natural environment. This study attempts to contribute to this debate by arguing that environmental concern is shaped by both "spiritual" and "ecological" cultural models of nature-society relations and that by distinguishing between these two, we can better recognize the social sources of variation in concern for the environment. An analysis of questionnaire data from 21 nations from the 1993 International Social Survey Program using ordinary least squares regression models shows that spiritual and ecological environmental worldviews have different social bases. Education generally positively predicts the latter but not the former. Patterns of national differences are noteworthy as well. Thus, conceptualizing public concern for the environment in terms of distinct cultural models may be more revealing than focusing on environmental concern as such.Publication Metadata only High-resolution beam steering using microlens arrays(Optical Soc Amer, 2006) N/A; N/A; Department of Electrical and Electronics Engineering; Akatay, Ata; Ataman, Çağlar; Ürey, Hakan; Master Student; PhD Student; Faculty Member; Department of Electrical and Electronics Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; N/A; 8579Imaging or beam-steering systems employing a periodic array of microlenses or micromirrors suffer from diffraction problems resulting from the destructive interference of the beam segments produced by the array. Simple formulas are derived for beam steering with segmented apertures that do not suffer from diffraction problems because of the introduction of a moving linear phase shifter such as a prescan lens before the periodic structure. The technique substantially increases the resolution of imaging systems that employ microlens arrays or micromirror arrays. Theoretical, numerical, and experimental results demonstrating the high-resolution imaging concept using microlens arrays are presented.Publication Metadata only Syndicated lending under asymmetric creditor information - Correction(Elsevier, 1996) Cadot, O; Department of Business Administration; Banerjee, Saugata; Researcher; Department of Business Administration; College of Administrative Sciences and Economics; N/AThis paper explores how asymmetric information about borrower quality among syndicated lenders alters the incentive to refinance illiquid borrowers. We use a model in which lenders enter the market sequentially in two rounds of lending. Between the two rounds, a shock separates borrowers into good ones and bad ones, and early entrants acquire information about individual borrower type, while late entrants know only the distribution of borrower types. The asymmetric information structure gives rise to both signalling and screening issues. We show that self-selecting contracts do not exist, and that there is always a pooling Perfect Bayesian Equilibrium in which late entrants lend to both good and bad types, without borrower type being exposed before final clearing at the terminal time. Based on this framework, we argue that prior to the 1982 international debt crisis, it was possible for banks with heavy exposure to troubled debtors to attract rational newcomers in syndicated loans which were, with positive probability, bailout loans.