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Publication Metadata only A decomposition model for continuous materials flow production systems(Taylor & Francis, 1997) Yeralan, Sencer; Department of Business Administration; N/A; Tan, Barış; Faculty Member; N/A; Department of Business Administration; College of Administrative Sciences and Economics; N/A; 28600; N/AThis study presents a general and flexible decomposition method for continuous materials flow production systems. The decomposition method uses the station model developed in the first part of this study (Yeralan and Tan 1997). The decomposition method is an iterative method. At each iteration the input and output processes of the station model are matched to the most recent solutions of the adjacent stations. The procedure terminates when the solutions converge and the conservation of materials flow is satisfied. The decomposition method does not alter the station parameters such as the breakdown, repair, and service rates. This method can be used to analyse a wide variety of production systems built from heterogeneous stations. The properties of the decomposition method are studied for the series arrangement of workstations. The convergence and uniqueness of the decomposition method are discussed. The method is compared to other approximation methods. The complexity of the decomposition method is empirically investigated and is shown to be in the order of N-2 where N is the number of stations in the line, irrespective of the buffer capacities.Publication Metadata only Alternating direction implicit technique and quantum evolution within the hydrodynamical formulation of Schrodinger's equation(Elsevier, 1998) Rabitz, H; N/A; Department of Mathematics; Dey, Bijoy K.; Aşkar, Attila; N/A; Faculty Member; Department of Mathematics; N/A; College of Sciences; N/A; 178822An alternative method of quantum dynamics is presented. The method is based on the hydrodynamical formulation of the time-dependent Schrodinger equation originally given by David Bohm in his quest for establishing a hidden variable alternative to the quantum mechanics. A new alternating direction implicit technique has been employed to decouple many-dimensional hydrodynamical equations into a set of one-dimensional equations which have been solved numerically by adopting a recently developed flux corrected transport algorithm. We apply the method to describe the dynamics of a quantum particle in three spatial dimensions where analytical solutions are known. (C) 1998 Elsevier Science B.V. All rights reserved.Publication Metadata only Competitiveness of Turkish SMSEs in the customs union(Elsevier Science Bv, 1997) Erzan, Refik; N/A; Filiztekin, Alpay; Faculty Member; N/A; N/AAs a basis for adjustment policies in Turkey, it is assumed that the impact of the Customs Union will be more severe on small- and medium-scale enterprises (SMSEs) in comparison with large establishments. The paper first studies growth in value added and productivity in Turkish manufacturing with respect to industry and size; then scrutinizes the hypothesis above by analyzing the vulnerability of firms depending on their sizes. The effects of the Customs Union on economic environment manifest themselves in terms of the level of protection, import penetration, the wage level, exchange rates and exchange rate volatility; and, changes in domestic and foreign demand, and credit availability. The paper analyzes the impact of these changes on firms' performances. Panel data techniques are used in the estimations. (C) 1997 Elsevier Science B.V.Publication Metadata only Debt concentration and bargaining power: large banks, small banks, and secondary market prices(Wiley-Blackwell, 1999) N/A; N/A; N/A; N/A; N/A; N/A; N/A; N/ACommerical bank debts of developing countries are held by large international banks and smaller domestic banks. This paper investigates how debt concentration-the proportion of a country's debt held by large banks relative to small banks-affects the secondary market price for the se loans. We find that countries with higher concentrations have higher secondary-market prices. We explain this empirical finding in a bargaining model that endogenizes the maximum penalty that banks can credibly impose on a recalcitrant debtor. We show that the banks' bargaining power increases with the degree of debt concentration, thus increasing repayment and secondary-market prices.Publication Metadata only Experimental and numerical investigation of thermal effects in end-pumped cr4+: forsterite lasers near room temperature(Institute of Electrical and Electronics Engineers (IEEE), 1999) Department of Physics; N/A; Sennaroğlu, Alphan; Pekerten, Barış; Faculty Member; Undergraduate Student; Department of Physics; College of Sciences; College of Sciences; 23851; N/APublication Metadata only Faster simulation methods for the non-stationary random vibrations of non-linear mdof systems(A A Balkema, 1995) Department of Mathematics; Department of Mathematics; N/A; N/A; Aşkar, Attila; Köylüoğlu, Hasan Uğur; Çakmak, Ayşe Selin; Nielsen, Susanne Ramtung; Faculty Member; Teaching Faculty; Other; Other; Department of Mathematics; College of Sciences; College of Sciences; N/A; N/A; 178822 N/A; N/A; N/AN/APublication Metadata only Influence of competitive hydrogen bonding between hard and soft segments on the properties of siloxane and polyether-based segmented copolymers.(Amer Chemical Soc, 1999) Department of Chemistry; Department of Chemistry; N/A; Yılgör, İskender; Burgaz, Engin; Metin, Burak; Yurtsever, İsmail Ersin; Yılgör, Emel; Faculty Member; Undergraduate Student; Undergraduate Student; Faculty Member; Researcher; Department of Chemistry; College of Sciences; College of Sciences; N/A; 24181; 17956; N/A; N/A; 40527N/APublication Metadata only Line spectral frequency representation of subbands for speech recognition(Elsevier, 1995) Erzin, Engin; N/A; N/A; N/A; N/AIn this paper, a new set of speech feature parameters is constructed from subband analysis based Line Spectral Frequencies (LSFs). The speech signal is divided into several subbands and the resulting subsignals are represented by LSFs. The performance of the new speech feature parameters, SUBLSFs, is compared with the widely used Mel Scale Cepstral Coefficients (MELCEPs). SUBLSFs are observed to be more robust than the MELCEPs in the presence of car noise. © 1995.Publication Metadata only Long memory or structural breaks: can either explain nonstationary real exchange rates under the current float?(Elsevier, 1999) Baum, Christopher F.; Barkoulas, John T.; N/A; Çağlayan, Mustafa; Researcher; N/A; N/AThis paper considers two potential rationales for the apparent absence of mean reversion in real exchange rates in the post-Bretton Woods era. We allow for (i) fractional integration and (ii) a double mean shift in the real exchange rate process. These methods, applied to CPI-based rates for 17 countries and WPI-based rates for 12 countries, demonstrate that the unit-root hypothesis is robust against both fractional alternatives and structural breaks. This evidence suggests rejection of the doctrine of absolute long-run purchasing power parity during the post-Bretton Woods era.Publication Metadata only Persistence in international inflation rates(Univ North Carolina, 1999) Baum, CF; Barkoulas, JT; N/A; Çağlayan, Mustafa; Researcher; N/A; N/AWe test for fractional dynamics in inflation rates based on the consumer price index (CPI) for 27 countries and inflation rates based on the wholesale price index (WPI) for 22 countries, The fractional differencing parameter is estimated using semiparametric and approximate maximum likelihood methods. Significant evidence of fractional dynamics with long-memory features is found in both CPI- and WPI-based inflation rates for industrial as well as developing countries. Implications of the findings are considered, and sources of long memory are hypothesized.