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Publication Metadata only Response to Commentary: 'Methodological concerns in usability evaluation of software prototypes' by Khajouei et al.(ACADEMIC PRESS INC ELSEVIER SCIENCE, 2011) Karahoca, Adem; Karahoca, Dilek; Bayraktar, Erkan; Tatoglu, Ekrem; Bahcesehir University; Bahcesehir University; Bahcesehir UniversityPublication Metadata only How do supply chain management and information systems practices influence operational performance? Evidence from emerging country SMEs(TAYLOR & FRANCIS LTD, 2016) Tatoglu, Ekrem; Bayraktar, Erkan; Golgeci, Ismail; Koh, S. C. Lenny; Demirbag, Mehmet; Zaim, Selim; Bahcesehir University; Bahcesehir University; University of Vaasa; University of Sheffield; University of Strathclyde; Istanbul Technical UniversityThis study first provides a comparative analysis of the impact of supply chain management (SCM) and information systems (IS) practices on operational performance (OPER) of small- and medium-sized enterprises (SMEs) operating in two neighbouring emerging country markets of Turkey and Bulgaria. Then, we investigate moderating effects of both SCM-IS-linked enablers and inhibitors on the links between SCM and IS practices and OPER of SMEs. To this end, we first empirically identify the underlying dimensions of SCM and IS practices, and SCM-IS-related enabling and inhibiting factors. Second, a series of regression analyses are undertaken to estimate the impact of the study's constructs on OPER of SMEs. The results are discussed comparatively within the contexts of both Turkish and Bulgarian SMEs and beyond. The study makes a significant contribution to the extant literature through obtaining and analysing cross-national survey data of SCM and IS practices in emerging country markets.Publication Metadata only Determinants of voluntary environmental management practices by MNE subsidiaries(ELSEVIER SCIENCE INC, 2014) Tatoglu, Ekrem; Bayraktar, Erkan; Sahadev, Sunil; Demirbag, Mehmet; Glaister, Keith W.; Bahcesehir University; Bahcesehir University; University of Salford; University of Strathclyde; University of WarwickThere have been few empirical studies of the determinants of voluntary environmental management practices (VEMPs) of MNE subsidiaries operating in emerging countries. To provide insight on this issue, this study explores the antecedent factors that drive MNE subsidiaries to adopt VEMPs, using data drawn from a key emerging country - Turkey. Based largely on the arguments of institutional theory and the resource based view of the firm, a number of hypotheses are formulated in order to investigate the effects of stakeholder pressures, perceived polluting potential, customer focus and competitive intensity. Each of these factors, with the exception of competitive intensity, is found to positively influence the adoption level of VEMPs by MNE subsidiaries. Some of the study's parent-level and subsidiary-level control variables are also found to have significant effects on the extent of VEMPs adoption by MNE subsidiaries. (C) 2013 Elsevier Inc. All rights reserved.Publication Metadata only Measuring the efficiency of customer satisfaction and loyalty for mobile phone brands with DEA(PERGAMON-ELSEVIER SCIENCE LTD, 2012) Bayraktar, Erkan; Tatoglu, Ekrem; Turkyilmaz, Ali; Delen, Dursun; Zaim, Selim; Bahcesehir University; Fatih University; Fatih UniversityThe concept of customer satisfaction and loyalty (CS&L) has attracted much attention in recent years. A key motivation for the fast growing emphasis on CS&L can be attributed to the fact that higher customer satisfaction and loyalty can lead to stronger competitive position resulting in larger market share and profitability. Using a data envelopment analysis (DEA) approach, in this study we analyzed and compared CS&L efficiency for mobile phone brands in an emerging telecommunication market, Turkey. The constructs of European Customer Satisfaction Index (ECSI) model are treated and used as input and output indicators of our DEA model. Drawing on the perceptual responses of 251 mobile phone users, the DEA models reveal that from the top six mobile phone brands in Turkey, Nokia features as the most efficient brand followed by LG and Sonny Ericsson in terms of CS&L efficiency, while Motorola, Samsung and Panasonic rank as the least efficient brands. (C) 2011 Elsevier Ltd. All rights reserved.Publication Metadata only The impact of remanufacturing on total inventory cost and order variance(ELSEVIER SCI LTD, 2014) Corum, Adnan; Vayvay, Ozalp; Bayraktar, Erkan; Bahcesehir University; Marmara UniversityIn this study, a hybrid system with both manufacturing and remanufacturing options is considered. Traditional (without remanufacturing), and push- and pull-controlled hybrid systems are compared using a simulation model under different demand and return rates, manufacturing and remanufacturing lead times, setup and holding cost rates. Production order variances that are used to measure the bullwhip effect, and total recoverable and serviceable inventory costs are considered as the main performance indicators. In terms of total recoverable and serviceable inventory cost, our findings point out that hybrid pull-control policy outperforms the hybrid push-control policy. To measure the performance of a traditional system in contrast to push- and pull-controlled hybrid systems, total serviceable inventory costs are compared. It is noted that hybrid push- and pull-control policies have lower serviceable inventory costs than a traditional system. Especially for higher remanufacturing return rates, the cost performance of hybrid systems is even better. Furthermore, hybrid production systems have lower manufacturing and remanufacturing order variances than a traditional system.Publication Metadata only A Causal Model of Quality Management Practices and Stakeholder Interests in Higher Education Institutions: Comparison of Public and Private Universities(IEEE, 2011) Bozbura, Tunc; Bayraktar, Erkan; Tatoglu, Ekrem; Kocaoglu, DF; Anderson, TR; Daim, TU; Bahcesehir University; Bahcesehir UniversityThe purpose of this study is to provide the empirical analysis of differences between the Turkish public and private universities with regard to the effects of quality management (QM) practices on meeting the expectations of various stakeholder groups. Drawing on extant literature, a set of nine QM practices that are applicable to higher education were identified and used as independent variables, while a total of three stakeholder groups including students, businesses and employees were identified as dependent variables. Relying on a survey questionnaire, primary data was collected from a sample of 144 academicians serving at 22 universities located within the greater metro-region of Istanbul, Turkey. Based on structural equation modeling, the test results indicated that the link between QM practices and stakeholder interests is much stronger for private universities than for public universities in terms of the effects of QM practices on fulfilling the expectations of stakeholder groups.Publication Metadata only Adoption of corporate environmental policies in Turkey(ELSEVIER SCI LTD, 2015) Tatoglu, Ekrem; Bayraktar, Erkan; Arda, Ozlem Ayaz; Bahcesehir University; Bahcesehir University; Bahcesehir UniversityDrawing on a sample of 519 Turkish firms operating in a wide variety of industries, this study aims at investigating the adoption of corporate environmental policies in a key emerging country. To this end, we first develop a conceptual framework relying predominantly on the arguments of stakeholder and institutional perspectives. Secondly, we examine the moderating effects of a number of firm specific contingency factors on the implementation level of corporate environmental policies. Among the underlying dimensions of corporate environmental policies, stakeholder pressures is found to be the most important followed by environmental management practices, while sources of greenhouse gas emissions feature as relatively less important. Regarding the moderating effect of firm specific contingencies, only firm size and geographic location are noted to have a strong impact on the implementation of corporate environmental policies. (C) 2014 Elsevier Ltd. All rights reserved.Publication Metadata only Response to Commentary: 'Methodological concerns in usability evaluation of software prototypes' by Khajouei et al.(2011) Karahoca, Adem; Karahoca, Dilek Yiğit; Bayraktar, Erkan; Tatoglu, Ekrem; Karahoca, Adem, Department of Software Engineering, Bahçeşehir Üniversitesi, Istanbul, Turkey; Karahoca, Dilek Yiğit, Department of Software Engineering, Bahçeşehir Üniversitesi, Istanbul, Turkey; Bayraktar, Erkan, Department of Industrial Engineering, Bahçeşehir Üniversitesi, Istanbul, Turkey; Tatoglu, Ekrem, Faculty of Economics and Administrative Sciences, Bahçeşehir Üniversitesi, Istanbul, Turkey[No abstract available]Publication Metadata only A causal model of quality management practices and stakeholder interests in higher education institutions: Comparison of public and private universities(2011) Bozbura, F. Tunc; Bayraktar, Erkan; Tatoglu, Ekrem; Bozbura, F. Tunc, Department of Industrial Engineering, Bahçeşehir Üniversitesi, Istanbul, Turkey; Bayraktar, Erkan, Department of Industrial Engineering, Bahçeşehir Üniversitesi, Istanbul, Turkey; Tatoglu, Ekrem, Faculty of Economics and Administrative Sciences, Bahçeşehir Üniversitesi, Istanbul, TurkeyThe purpose of this study is to provide the empirical analysis of differences between the Turkish public and private universities with regard to the effects of quality management (QM) practices on meeting the expectations of various stakeholder groups. Drawing on extant literature, a set of nine QM practices that are applicable to higher education were identified and used as independent variables, while a total of three stakeholder groups including students, businesses and employees were identified as dependent variables. Relying on a survey questionnaire, primary data was collected from a sample of 144 academicians serving at 22 universities located within the greater metro-region of Istanbul, Turkey. Based on structural equation modeling, the test results indicated that the link between QM practices and stakeholder interests is much stronger for private universities than for public universities in terms of the effects of QM practices on fulfilling the expectations of stakeholder groups. © 2011 IEEE. © 2011 Elsevier B.V., All rights reserved.Publication Metadata only Measuring the efficiency of customer satisfaction and loyalty for mobile phone brands with DEA(2012) Bayraktar, Erkan; Tatoglu, Ekrem; Turkyilmaz, Ali; Delen, Dursun; Zaim, Selim; Bayraktar, Erkan, Department of Industrial Engineering, Bahçeşehir Üniversitesi, Istanbul, Turkey; Tatoglu, Ekrem, Bahçeşehir Üniversitesi, Istanbul, Turkey; Turkyilmaz, Ali, Department of Industrial Engineering, Fatih Üniversitesi, Istanbul, Turkey; Delen, Dursun, Department of MSIS, Oklahoma State University-Tulsa, Tulsa, United States; Zaim, Selim, Department of Management, Fatih Üniversitesi, Istanbul, TurkeyThe concept of customer satisfaction and loyalty (CS&L) has attracted much attention in recent years. A key motivation for the fast growing emphasis on CS&L can be attributed to the fact that higher customer satisfaction and loyalty can lead to stronger competitive position resulting in larger market share and profitability. Using a data envelopment analysis (DEA) approach, in this study we analyzed and compared CS&L efficiency for mobile phone brands in an emerging telecommunication market, Turkey. The constructs of European Customer Satisfaction Index (ECSI) model are treated and used as input and output indicators of our DEA model. Drawing on the perceptual responses of 251 mobile phone users, the DEA models reveal that from the top six mobile phone brands in Turkey, Nokia features as the most efficient brand followed by LG and Sonny Ericsson in terms of CS&L efficiency, while Motorola, Samsung and Panasonic rank as the least efficient brands. © 2011 Elsevier Ltd. All rights reserved. © 2011 Elsevier B.V., All rights reserved.