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Permanent URI for this collectionhttps://hdl.handle.net/20.500.14288/3
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Publication 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 How similar are protein folding and protein binding nuclei? Examination of vibrational motions of energy hot spots and conserved residues(Cell Press, 2005) Haliloğlu, Türkan; Ma, Buyong; Nussinov, Ruth; Department of Chemical and Biological Engineering; Keskin, Özlem; Faculty Member; Department of Chemical and Biological Engineering; College of Engineering; 26605The underlying physico-chemical principles of the interactions between domains in protein folding are similar to those between protein molecules in binding. Here we show that conserved residues and experimental hot spots at intermolecular binding interfaces overlap residues that vibrate with high frequencies. Similarly, conserved residues and hot spots are found in protein cores and are also observed to vibrate with high frequencies. In both cases, these residues contribute significantly to the stability. Hence, these observations validate the proposition that binding and folding are similar processes. In both packing plays a critical role, rationalizing the residue conservation and the experimental alanine scanning hot spots. We further show that high-frequency vibrating residues distinguish between protein binding sites and the remainder of the protein surface.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 Application QoS fairness in wireless video scheduling(Institute of Electrical and Electronics Engineers (IEEE), 2006) N/A; N/A; Department of Electrical and Electronics Engineering; Department of Electrical and Electronics Engineering; Department of Electrical and Electronics Engineering; Özçelebi, Tanır; Tekalp, Ahmet Murat; Civanlar, Mehmet Reha; Sunay, Mehmet Oğuz; PhD Student; Faculty Member; Faculty Member; Faculty Member; Department of Electrical and Electronics Engineering; Graduate School of Sciences and Engineering; College of Engineering; College of Engineering; College of Engineering; N/A; 26207; 16372; N/AThe video pre-roll delay for filling up the client buffer can not be too long for user utility and buffer limitations in wireless point-to-multipoint streaming systems. Cross-layer design that deals with both physical and application layer aspects jointly is necessary for this purpose. We present a cross-layer optimized multiuser video adaptation and user scheduling framework for wireless video communication, where Quality-of-Service (QoS) fairness among users is provided with maximum video quality and video throughput. Both protocol layers are jointly optimized using a single Multi-Objective Optimization (MOO) framework that aims to schedule the user with the least remaining playback time and the highest video throughput (delivered video seconds per transmission slot) with maximum video quality. Experiments carried out in the IS-856 (1×EV-DO) standard and ITU pedestrian and vehicular environments demonstrate the improvements over the state-of-the-art schedulers in terms of video QoS fairness, video quality and throughput. / İstemci arabelleğini doldurmak için videodan önce gösterilen reklam gecikmesi, kablosuz noktadan çok noktaya akış sistemlerinde kullanıcı yardımcı programı ve arabellek sınırlamaları için çok uzun olamaz. Bu amaç için hem fiziksel hem de uygulama katmanı özelliklerini birlikte ele alan çapraz katman tasarımı gereklidir. Kablosuz video iletişimi için, kullanıcılar arasında Hizmet Kalitesi (QoS) adaletinin maksimum video kalitesi ve video çıkışı ile sağlandığı, katmanlar arası optimize edilmiş çok kullanıcılı bir video uyarlaması ve kullanıcı planlama çerçevesi sunuyoruz. Her iki protokol katmanı, kullanıcıyı maksimum video kalitesiyle en az kalan oynatma süresi ve en yüksek video verimi (iletim yuvası başına iletilen video saniyesi) ile programlamayı amaçlayan tek bir Çok Amaçlı Optimizasyon (MOO) çerçevesi kullanılarak ortaklaşa optimize edilmiştir. IS-856 (lxEV-DO) standardında ve ITU yaya ve araç ortamlarında gerçekleştirilen deneyler, video QoS adaleti, video kalitesi ve verim açısından en son teknoloji zamanlayıcılara göre iyileştirmeler göstermektedir.Publication Metadata only Resonant channel-dropping filter with integrated detector system based on optical fiber coupler and microsphere(IOP Publications, 2004) İşci, Şenol; Yılmaz, Yiğit; Department of Physics; Serpengüzel, Ali; Kurt, Adnan; Bilici, Temel; Faculty Member; Teaching Faculty; N/A; Department of Physics; College of Sciences; N/A; 27855; 194455; N/APublication 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 Exclusionary populism in Western Europe in the 1990s: electoral success and political impact(Palgrave, 2005) N/A; N/A; N/AN/APublication Metadata only On the cyclic stability and fatigue performance of ultrafine-grained interstitial-free steel under mean stress(Trans Tech Publications Ltd, 2008) Niendorf, Thomas; Maier, Hans J.; Karaman, Ibrahim; Department of Mechanical Engineering; Canadinç, Demircan; Faculty Member; Department of Mechanical Engineering; College of Engineering; 23433This paper reports on the fatigue performance of an ultrafine-grained (UFG) interstitial-free (IF) steel deformed at various mean stress levels. The UFG microstructure was achieved using equal channel angular extrusion processing at room temperature (RT) and along an "efficient" route, giving way to the formation of high angle grain boundaries (HAGBs) with a high volume fraction. The current study not only confirms the previous finding that a high volume fraction of HAGBs promotes cyclic stability, but also inquires into the role of mean stress level on the cyclic stability. It is shown that the UFG IF steel exhibits a stable cyclic deformation response in the lowcycle fatigue regime within the medium applied mean stress range of -75 to 75 MPa. The corresponding fatigue lives can still be predicted with the Smith-Watson-Topper approach within this range. Furthermore, the present study demonstrates that the evolution of mean strains with cyclic deformation can be linked to the evolution of mean stresses in strain-controlled loading.