İşletme Fakültesi

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Citation Count: 13
Adoption of Mobile Health Apps in Dietetic Practice: Case Study of Diyetkolik
(Jmır Publıcatıons, Inc, 130 Queens Quay E, 2020) Akdur, Görkem; Aydın, Mehmet Nafiz; Akdur, Gizdem
Background: Dietetics mobile health apps provide lifestyle tracking and support on demand. Mobile health has become a new trend for health service providers through which they have been shifting their services from clinical consultations to online apps. These apps usually offer basic features at no cost and charge a premium for advanced features. Although diet apps are now more common and have a larger user base, in general, there is a gap in literature addressing why users intend to use diet apps. We used Diyetkolik, Turkey's most widely used online dietetics platform for 7 years, as a case study to understand the behavioral intentions of users. Objective: The aim of this study was to investigate the factors that influence the behavioral intentions of users to adopt and use mobile health apps. We used the Technology Acceptance Model and extended it by exploring other factors such as price-value, perceived risk, and trust factors in order to assess the technology acceptance of users. Methods: We conducted quantitative research on the Diyetkolik app users by using random sampling. Valid data samples gathered from 658 app users were analyzed statistically by applying structural equation modeling. Results: Statistical findings suggested that perceived usefulness (P<.001), perceived ease of use (P<.001), trust (P<.001), and price-value (P<.001) had significant relationships with behavioral intention to use. However, no relationship between perceived risk and behavioral intention was found (P=.99). Additionally, there was no statistical significance for age (P=.09), gender (P=.98), or previous app use experience (P=.14) on the intention to use the app. Conclusions: This research is an invaluable addition to Technology Acceptance Model literature. The results indicated that 2 external factors (trust and price-value) in addition to Technology Acceptance Model factors showed statistical relevance with behavioral intention to use and improved our understanding of user acceptance of a mobile health app. The third external factor (perceived risk) did not show any statistical relevance regarding behavioral intention to use. Most users of the Diyetkolik dietetics app were hesitant in purchasing dietitian services online. Users should be frequently reassured about the security of the platform and the authenticity of the platform's dietitians to ensure that users' interactions with the dietitians are based on trust for the platform and the brand.
Citation Count: 1
Analysis of the Patients and Physicians Connection Network on an Online Health Information Platform
(IOS Press, 2014) Aydın, Mehmet Nafiz; Perdahci, N. Ziya
Social network applications have gained popularity in the health domain as they bring health information seekers (patients and alike) and medication advice providers (physicians and other relevant actors) together. By employing a network science perspective this research is aimed to understand an information network establishing connections among and between information seekers and providers. We found that such a connection network surfaces most of the essential characteristics of a typical complex network. Furthermore a detailed structural analysis shows some intriguing relations and connection behaviours in the network. Implications of the findings are discussed from the perspectives of medical informatics and social network analysis.
Citation Count: 24
Antecedents and Performance Outcomes of Value-Based Selling in Sales Teams: a Multilevel, Systems Theory of Motivation Perspective
(Springer, 2020) Mullins, Ryan; Mengüç, Bülent; Panagopoulos, Nikolaos G.
Firms are increasingly deploying a value-based selling (VBS) approach in their sales organizations to drive growth for new offerings. However, VBS adoption remains challenging, signaling that leaders need guidance to motivate VBS. Drawing from the systems theory of motivation, we examine motivational mechanisms at two levels-salesperson and sales team-to understand how to motivate, and benefit from, VBS. Using multisource data (i.e., salespeople, managers, archival performance) from 70 sales teams in a U.S.-based manufacturing and services provider, our findings illustrate drivers and outcomes of VBS. Specifically, we uncover a framework of salesperson, leader, customer, and team factors that help explain salesperson motivation for VBS. Importantly, we link VBS to customers' adoption of new products to support VBS's role for selling new products. Critical for sales team strategy, our model also integrates a team-level motivational mechanism to provide a comprehensive framework for salesperson and sales team motivations and outcomes.
Citation Count: 18
Applying a Behavioural and Operational Diagnostic Typology of Competitive Intelligence Practice: Empirical Evidence From the Sme Sector in Turkey
(Taylor and Francis Group, 2012) Wright, Sheila; Bisson, Christophe; Duffy, Alistair P.
This paper reports on an empirical study conducted within the SME sector in the city of Istanbul Turkey. The findings from this study enabled the creation of a behavioural and operational typology of competitive intelligence practice one developed from the work of S. Wright D.W. Pickton and J. Callow (2002. Competitive intelligence in UK firms: A typology. Marketing Intelligence & Planning 20 349-360). Using responses to questions which indicated a type of behaviour or operational stance towards the various strands of CI practice under review it has been possible to identify areas where improvements could be made to reach an ideal situation which could garner significant competitive advantage for the SMEs surveyed. © 2012 Copyright Taylor and Francis Group LLC.
Citation Count: 46
Assessing Quality in Higher Education: New Criteria for Evaluating Students' Satisfaction
(Taylor & Francis, 2011) Zineldin, Mosad; Akdag, Hatice Camgöz; Vasicheva, Valentina
The aim of this research is to present a new quality assurance model (5Qs) and to examine the major factors affecting students' perception of cumulative satisfaction. The model includes behavioural dimensions of student satisfaction. The factors included in this cumulative summation are technical functional infrastructure interaction and atmosphere of higher education institutions. This study concerns students in higher education institutions in Istanbul Turkey. The questionnaire contains a total of 39 items (attributes) of newly developed five quality dimensions (5Qs). A total of 1641 complete and usable questionnaires was received. Frequency analysis factor analysis and reliability analysis were used for analysing the data collected. Inspection of scree plot and eigenvalues enabled the analysis to reduce the 39 quality attributes to seven factors. The results can be used by higher education institutions to re-engineer and re-design creatively their quality-management processes and the future direction of their more effective education quality strategies. © 2011 Taylor & Francis.
Citation Count: 11
Assessment of Chromite Liberation Spectrum on Microscopic Images by Means of a Supervised Image Classification
(Elsevier Science Bv, 2017) Camalan, Mahmut; Çavur, Mahmut; Hosten, Cetin
Assessment of mineral liberation spectrum with all its aspects is essential for plant control and optimization. This paper aims to estimate 2D mineral map and its associated liberation spectrum of a particular chromite sample from optical micrographs by using Random Forest Classification a powerful machine-learning algorithm implemented on a user-friendly and an open-source software. This supervised classification method can be used to accurately generate 2D mineral map of this chromite sample. The variation of the measured spectra with the sample size is studied showing that images of 200 particles randomly selected from the optical micrographs are sufficient to reproduce liberation spectrum of this sample. In addition the 2D spectrum obtained with this classification method is compared with the one obtained from the Mineral Liberation Analyzer (MLA). Although 2D mineralogical compositions obtained by the two methods are quite similar microscopic analysis estimates poorer liberation than MLA due to the residual noise (misclassified gangue) generated by the classification. Nevertheless we cannot compare the reliabilities of the two methods as there is not a standard produce yet to quantify the accuracy of MLA analysis. (C) 2017 Elsevier B.V. All rights reserved.
Citation Count: 0
Babbling Through Social Media: a Cross-Country Study Mapping Out Social Networks Using Ewom Intentions
(Springer, 2023) Zülal, İşler; Kıygı-Çallı, Meltem; El Oraiby, Maryam
This research aims to determine the factors affecting the users’ electronic word-of-mouth (eWOM) seeking and sharing intentions and to reveal the interactions among and within clusters using social network analysis (SNA). This study includes three hierarchical sub-studies conducted in two countries, Turkey and Poland. First, we develop a segmentation for social networking site (SNS) users based on the frequency of sharing product-related information on SNSs. Second, we investigate the impact of several factors that affect eWOM seeking and sharing intentions using regression analysis. In the second sub-study, we also include the identified segments developed in the first sub-study as another factor that may have differentiated eWOM intentions. Third, to understand the degree of interaction among SNS users, we apply an SNA using the forecasted eWOM intentions scores from the second sub-study, which gives us hypothetical social networks. The results of SNA present strong interactions inter- and intra-clusters in both countries. Some key findings include the identification of three SNS user segments, including “Middlers,” that may be of particular interest to brands. We also find that in terms of eWOM intentions, users in Turkey are more active than in Poland. Although some predictors of eWOM seeking and sharing intentions differ between the two countries, users intend to be more active in eWOM seeking than in eWOM sharing. The comparative study provides valuable insights for decision-makers to engage different market segments via SNSs with various proposed features using suggested information contents for selected product categories.
Citation Count: 0
"bağımsız Mali Müşavirlerin Müşteri Seçimine Etki Eden Faktörlerin ve Karar Alternatiflerinin Ahp ve Maut Yöntemleri Çerçevesinde Değerlendirilmesi: İstanbul Kentine İlişkin Bir Uygulama"
(Türmob, 2019) Çanakçıoğlu, Mustafa
Bağımsız Serbest Muhasebeci Mali Müşavirlerin (SMMM) güven, doğruluk ve bilgiye dayanan uzun süreli bir ticari ilişki içerisinde bulunacakları müşterilerinin seçimi sırasında alacakları kararların sonuçları aslında sadece bu iki tarafı değil, işletmenin tüm paydaşlarını da etkilemektedir. Mali müşavirlerin verdikleri hizmetlerin çeşitlenmesinden ve karar alma süreçlerine çok sayıda faktör ve değişkenin etki etmesinden dolayı karar alıcıların kişisel tecrübe ve yargılarına bağlı olarak doğru, hızlı ve güvenilir karar almaları son derece zorlaşmıştır. Bu nedenle karar alma süreçleri için sistematik ve yapısal bir çerçeve ortaya koymak amacıyla çok kriterli karar verme (ÇKKV) yöntemlerinin kullanılması ihtiyaç haline gelmiştir. Bu çalışmada Analitik Hiyerarşi Proses (AHP) yöntemi ile birlikte AHP ve Multiple Attribute Utility Theory (MAUT) yöntemlerinden oluşan hibrid bir model önerilmektedir. Modelde 13 tane seçim kriteri ve 4 tanede karar alternatifi belirlenmiştir. Mali müşavirlerin müşteri seçim kriterleri ve karar alternatifleri için önce AHP yöntemi kullanılarak seçim kriterleri ağırlıklandırılırken, karar noktaları için göreli önem değerleri belirlenmiştir. Modelin ikinci aşamasında AHP yöntemi ile MAUT yönteminin entegre edildiği hibrid bir model kullanılmış, AHP ile seçim kriterleri ağırlıklandırılırken, MAUT yöntemi ile karar alternatiflerinin önem değerleri hesaplanmıştır. Her iki farklı yöntem çerçevesinde elde edilen sonuçlar gözden geçirilmiş, önerilen modelin uygulanabilirliği iki farklı model çerçevesinde test edilmiştir.
Citation Count: 29
Bank Credit in Uncertain Times: Islamic Vs. Conventional Banks
(Elsevier Ltd, 2020) Bilgin, Mehmet Hüseyin; Danışman, Gamze Öztürk; Demir, Ender; Tarazi, Amine
This paper explores whether the impact of economic uncertainty on credit growth differs for Islamic vs. conventional banks. Using a sample of 416 banks (58 Islamic and 358 conventional) in 12 countries, the findings indicate that an increase in economic uncertainty significantly decreases the credit growth of conventional banks but does not have any significant impact on Islamic banks’ credit growth. Our results are robust to alternative specifications and addressing endogeneity concerns using GMM estimators. We further observe that our findings are stronger for the following countries: (1) countries with explicit deposit insurance protection system for Islamic banks, (2) lower foreign dominance, and (3) countries with a higher share of deposits and assets in Islamic banks.
"BANKA PERFORMANSININ ENTROPİ VE COPRAS YÖNTEMİ İLE DEĞERLENDİRİLMESİ: TÜRK BANKACILIK SEKTÖRÜ ÜZERİNE BİR ARAŞTIRMA"
(İstanbul Serbest Muhasebeci Mali Müşavirler Odası, 2019) Toprak, Mehmet Sabri
Bu çalışmanın amacı, Türkiye’de faaliyet gösteren mevduat bankalarının finansal performansının çok kriterli karar verme yöntemlerinden Entropi ve COPRAS (Complex Proportional ASsessment) yöntemleri ile değerlendirilmesidir. Bu amaçla sektörde aktif büyüklüğü açısından en büyük 11 bankanın 2017 dönemine ilişkin finansal tablolarından hesaplanan verileri kullanılmıştır. Bankalara ait özkaynaklar, mevduatlar, personel giderleri, personel sayısı ve şube sayısı girdi faktörleri olarak kullanılırken, krediler, net faaliyet karı, aktif karlılık oranı ve özkaynak karlılık oranı ise çıktı faktörleri olarak seçilmiştir. Türk bankalarının finansal performansının değerlendirilmesinde Entropi ve COPRAS yöntemlerinin birlikte ilk kez kullanıldığı çalışmada Entropi yöntemiyle seçilen kriterlerin ağırlıkları belirlenmiş, COPRAS yöntemi ile de bankalar performans açısından sıralanmıştır. Çalışma sonucunda sektördeki büyük bankaların finansal performans değeri açısından en iyi performansa sahip bankalar olduğu tespit edilmiştir.
Citation Count: 20
A Behavioral Analysis of Investor Diversification
(Routledge Journals Taylor & Francis Ltd, 2014) Fuertes, Ana-Maria; Muradoğlu, Gülnur; Öztürkkal, Belma
This paper studies the link between individual investors' portfolio diversification levels and various personal traits that proxy informational advantages and overconfidence. The analysis is based on objective data from the largest Turkish brokerage house tracking 59951 individual investors' accounts with a total of 3248654 million transactions over the period 2008-2010. Wealthier highly educated older investors working in the finance sector and those trading relatively often show higher diversification levels possibly because they are better equipped to obtain and process information. Finance professionals married investors and those placing high-volume orders through investment centers show poorer diversification possibly as a reflection of overconfidence. Our analysis reveals important nonlinear effects implying that the marginal impact of overconfidence on diversification is not uniform across investors but varies according to the investor's information gathering and processing abilities.
BİST KİMYA, PETROL KAUÇUK VE PLASTİK ÜRÜNLER SEKTÖRÜNDEKİ İŞLETMELERİN FİNANSAL PERFORMANSLARININ HİBRİD ÇKKV YAKLAŞIMI ÇERÇEVESİNDE DEĞERLENDİRİLMESİ
(Beykoz Üniversitesi, 2019) Çanakçıoğlu, Mustafa
Bu çalışmada Borsa İstanbul (BIST) imalat sanayinde yer alan kimya, petrol kauçuk ve plastik ürünler sektöründe yer alan firmaların oran analizi yaklaşımı ile birbirleriyle karşılaştırmalı finansal performans analizi yapılmıştır. Çalışma kapsamında 30 işletmenin 2013-2017 tarihleri arasındaki temel mali tablolardan elde edilen 10 finansal oran kriteri kullanılmıştır. Elde edilen veriler “Çok Kriterli Karar Verme” (ÇKKV) yöntemlerinden Entropi ve Gri İlişkiler Analiz (GİA) ile değerlendirilmiştir. Belirlenen seçim kriterlerinin ağırlıkları Entropi tekniği kullanılarak hesaplanmıştır. Ardından GİA yöntemi kullanılarak karar seçeneklerinin göreli önem değerleri hesaplanmış, firmalar her yılın performans değerlerine göre sıralandırılmıştır.
Citation Count: 11
Bivariate Pseudo-Gompertz Distribution and Concomitants of Its Order Statistics
(Elsevier Science Bv, 2013) Yorubulut, Serap; Gebizlioğlu, Ömer Lütfi
This paper presents a new bivariate Pseudo-Gompertz distribution that sprouts from the classical Gompertz distribution and possesses the features of pseudo-distribution functions. In addition to some standard properties of the proposed distribution distributions of order statistics and their concomitants for samples drawn from the new distribution are obtained. The survival and hazard functions of the concomitants are shown and their values are tabled. Interpretations of the results are given in connection with risk events and risk management. (C) 2013 Elsevier B.V. All rights reserved.
Citation Count: 0
Borsa İstanbul’da İşlem Gören Çimento Firmalarının Entropi-eatwios Bütünleşik Yaklaşımı İle Finansal Performanslarının Değerlendirmesi
(Yaşar Üniversitesi, 2019) Çanakçıoğlu, Mustafa
Gelişmekte olan ülkelerde inşaat, altyapı ve üstyapı projelerinin gerçekleştirilebilmesi büyük oranda çimento sektörü ile ilişkilidir. Bu nedenle ülkelerin çimento sektörlerine ilişkin performans ve etkinliklerinin ölçülmesi gelecekte büyüme ve gelişme perspektifine ilişkin bir takım göstergeler ortaya koyabilmektedir. Türkiye’nin bu perspektifte ilgili sektörlerinin analizi gelecek projeksiyonu için hayati düzeyde öneme sahiptir. Bu kapsamda, Borsa İstanbul (BİST) Taş, Toprak Endeksinde yer alan çimento işletmelerin finansal performanslarının incelemesi bu çalışmanın temel amacıdır. Bu çalışmada BİST’te işlem gören çimento firmalarının performanslarını analiz etmek üzere çok kriterli karar verme teknikleri olarak kullanılan Entropi ve EATWIOS (Efficiency Analysis Technique with Input Output Satisficing) yöntemlerinden oluşan hibrid bir modelin kullanılması önerilmektedir. Araştırma örneklemi, Borsa İstanbul’da işlem gören 15 çimento üretimi yapan işletmeden oluşmaktadır. Analiz sonucunda en iyi finansal performansa sahip olan çimento işletmesinin Adana Çimento olduğu belirlenmiştir.
Citation Count: 15
Branch outage solution using particle swarm optimization
(2008) Ceylan, Oğuzhan; Ozdemir, Aydogan; Dağ, Hasan
For post outage MW line flows and voltage magnitude calculations most of the methods use linear methods because of their simplicity. Especially for reactive power flow calculations one can face high errors. In this paper we use a minimization method that minimizes the errors resulting from the linear system model implementation. We solve the optimization problem using particle swarm optimization. We give some outage examples using IEEE 14 bus IEEE 30 bus and IEEE 57 bus data and compare the results with full ac load flow calculation. © 2008 Australasian Universities Power Engineering Conference (AUPEC'08).
Brand Love and Brand Forgiveness: an Empirical Study in Turkey
(Warsaw: Faculty of Management Publishing House. University of Warsaw, 2022-04-12) Tosun, Petek; Yanar Gürce, Merve; Öncü Eroğlu Pektaş, Güzide
Brand love is an interesting and important concept that required further research in brand management. This study tested the impacts of consumer attitudes, subjective norms, and brand anthropomorphization on brand love and brand forgiveness in the framework provided by the theory of planned behavior. Regression analyses showed that brand anthropomorphization and subjective norms have a signifi cant impact on brand love. Brand love positively infl uences brand forgiveness and acts as a mediator between subjective norms, brand anthropomorphization, and brand forgiveness constructs. Besides mediation, brand anthropomorphization directly infl uences brand forgiveness. The fi ndings of this study contribute to the existing knowledge on brand love and brand forgiveness concepts by presenting empirical research fi ndings that investigate brand love antecedents. This study has also shown the signifi cant impact of anthropomorphizing a brand on brand forgiveness and brand love.
Citation Count: 0
Capital Markets Trade Openness and Productivity in Emerging Economies Introduction
(M.E Sharpe Inc., 2011) Bilgin, Mehmet Hüseyin; Danis, Hakan
[Abstract Not Available]
Citation Count: 0
A Characterization of Totally Umbilical Hypersurfaces of a Space Form by Geodesic Mapping
(Springer, 2013) Canfes, Elif Ozkara; Özdeğer, Abdülkadir
The idea of considering the second fundamental form of a hypersurface as the first fundamental form of another hypersurface has found very useful applications in Riemannian and semi-Riemannian geometry especially when trying to characterize extrinsic hyperspheres and ovaloids. Recently T. Adachi and S. Maeda gave a characterization of totally umbilical hypersurfaces in a space form by circles. In our paper we give a characterization of totally umbilical hypersurfaces of a space form by means of geodesic mapping.
Citation Count: 16
Comparison of Feature Selection Algorithms for Medical Data
(IEEE, 2012) Dağ, Hasan; Sayın, Kamran Emre; Yenidoğan, Işıl; Albayrak, Songül Varli; Acar, Can
Data mining application areas widen day by day. Among those areas medical area has been receiving quite a big attention. However working with very large data sets with many attributes is hard. Experts in this field use heavily advanced statistical analysis. The use of data mining techniques is fairly new. This paper compares three feature selection algorithms on medical data sets and comments on the importance of discretization of attributes. © 2012 IEEE.
Citation Count: 4
Computing Finite Time Non-Ruin Probability and Some Joint Distributions in Discrete Time Risk Model With Exchangeable Claim Occurrences
(Elsevier Science, 2017) Eryilmaz, Serkan; Gebizlioğlu, Ömer Lütfi
In this paper we study a discrete time risk model based on exchangeable dependent claim occurrences. In particular we obtain expressions for the finite time non-ruin probability and the joint distribution of the time to ruin the surplus immediately before ruin and the deficit at ruin. An illustration of the results is given and some implications of the results are provided. Comparisons are made with the corresponding results for the classical compound binomial model of independent and identically distributed claim occurrences. (C) 2016 Elsevier E.V. All rights reserved.

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