Yildiz Sahin

Dr. Yildiz Sahin

orcid

Research Focus & Metrics

Academic Career Length

8Years (2019-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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21 January 2023 in Systems
Verified
Journal Article
Open access
PDF file
YSYildiz Sahin
Yildiz Sahin
Atik KulakliAtik Kulakli
Atik Kulakli
Higher education institutions and organizations have new opportunities thanks to digital technologies. Universities worldwide seek to provide the most outstanding available student services, particularly those that promote student achievements in their program objectives. The World Wide Web, in particular, has advanced Internet-based information technology, dramatically impacting all types of education delivery. Therefore, it has rapidly expanded the Open and Distance Education (ODE) system. This study aims to evaluate the performance of the higher institutions’ ODE websites within 5 main criteria (Navigation, Accessibility, Design, Content Readability, and Announcements) and 20 sub-criteria. The case study has taken place in Türkiye, and the institutions available for the study were Anadolu University ODE; Ankara University ODE; Ataturk University ODE; Istanbul University ODE. This paper utilized two Multi-criteria Decision Making (MCDM) techniques: Fuzzy Analytical Hierarchy Process (Fuzzy AHP) and Fuzzy Weighted Aggregated Sum Product Assessment (Fuzzy WASPAS). The criteria were determined with the help of the literature, which was searched, then categorized and weighted with Fuzzy AHP. The evaluation step in the process was conducted with Fuzzy WASPAS to select the best-performed alternative ODE websites. According to research findings, Design is the essential criterion, followed by Accessibility, Content Readability, Announcement, and Navigation criteria. Our research identified and recommended the development areas for further research and proposed theoretical and practical implications as well as managerial decisions to be considered for the ODE website improvements.

12 August 2023 in Systems
Verified
Journal Article
Open access
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Atik KulakliAtik Kulakli
Atik Kulakli
YSYildiz Sahin
Yildiz Sahin
The airline sector is critical in today’s globalized society, supporting the efficient movement of people and products worldwide. Airlines continuously seek methods to enhance their operational performance to remain competitive in the face of increased competition. This study focuses on the application of multi-criteria decision making (MCDM) techniques to improve the ground operational performance of low-cost carriers (LCCs), also known as low-cost (budget) airlines. In recent years, MCDM techniques have gained considerable attention in addressing complex decision problems with complex goals. This research aims to bridge this gap by proposing a comprehensive framework combining MCDM techniques to enhance airline operational strategies and increase performance. The study utilizes qualitative and quantitative data, drawing on previously published materials on MCDM techniques in the aviation sector. It utilizes a fuzzy Analytic Hierarchy Process (AHP) and a fuzzy Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) methodologies. A case study is conducted to evaluate the ground operational performance of three airline companies based in Türkiye, considering five main criteria and eighteen sub-criteria. The findings of this research will contribute to a comprehensive understanding of operational performance in the airline sector. The study’s findings show that five primary criteria’s estimated weights are examined; it is seen that “Flight Schedule and Routes (FSR)” has the highest importance weight of 0.30. With a weight value of 0.26, “Counter Services (CS)” has the second most significant impact. “Ticketing (T)”, which ranks third in terms of its impact on the solution, has a weight value of 0.19. Upon reviewing the analysis’s findings, it can be seen that the third alternative is relatively prominent among the others. Airline_3 ranked first with a weight value of 0.361, while Airline_2 ranked second with a weight value of 0.331. Airline_1 ranked last with an actual weight of 0.308. The study provides highlights of the implications and limitations of the research and suggests future research directions.

2 March 2023
Verified
Book Chapter
Closed access
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YSYildiz Sahin
Yildiz Sahin
Atik KulakliAtik Kulakli
Atik Kulakli
SBSemra Birgün
Semra Birgün
HOH Saduman Okumus
H Saduman Okumus

29 October 2019 in Bilişim Teknolojileri Dergisi
Verified
Journal Article
Open access
PDF file
YSYildiz Sahin
Yildiz Sahin
DSDeniz Merve Sara
Deniz Merve Sara
The increasing usage of the internet all over the world has become an indispensable part of our life. The use of internet in many areas such as health, tourism, education, transportation, shopping, communication, banking is increasing day by day and spreading over a wider area. With the widespread use of the Internet, the use of web sites and the work carried out on this area have also increased. Web sites are the bridge between user and information resources. User-centric design principles make it possible for users to efficiently use web sites. Several methods, standards, and studies have been done to measure accessibility and usability.In this study, the preference of web sites in the shopping sector was compared using the VIKOR method, which is a multi-criteria decision-making method, and the most preferred website was identified. In this context, the opinions of one hundred and eighty web site users were consulted. In the scope of the study, evaluation criteria were determined first. Using VIKOR method, web sites with similar characteristics have been examined in terms of usability.

18 July 2023 in Preprints.org
Verified
Preprint
Open access
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Atik KulakliAtik Kulakli
Atik Kulakli
YSYildiz Sahin
Yildiz Sahin
The airline sector is critical in today's globalized society, supporting the efficient movement of people and products worldwide. Airlines are continuously looking for methods to enhance their operational performance to remain competitive in the face of increased competition. This study focuses on the application of Multi-Criteria Decision Making (MCDM) techniques to improve low-cost carrier (LCC) also known or low-cost (budget) airlines' ground operational performance. MCDM techniques have gained considerable attention in recent years to address complex decision problems with multiple conflicting goals. This research aims to bridge this gap by proposing a comprehensive framework that combines MCDM techniques to enhance airline operational strategies to increase performance. The study utilizes qualitative and quantitative data, drawing on previously published materials on MCDM techniques in the aviation sector. It utilizes fuzzy Analytic Hierarchy Process (AHP) and fuzzy Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) methodologies. A case study is conducted to evaluate the ground operational performance of three airline companies based in Türkiye, considering five main criteria and 18 sub-criteria. The findings of this research will contribute to a comprehensive understanding of operational performance in the airline sector. It also highlights the implications and limitations of the research and suggests future research directions.

27 April 2019 in MANAS Sosyal Araştırmalar Dergisi
Verified
Journal Article
Closed access
PDF file
KBKasım BAYNAL
Kasım BAYNAL
YSYildiz Sahin
Yildiz Sahin
STSAİME Taphasanoğlu
SAİME Taphasanoğlu
Türkiye’de son 10 yılda inşaat sektörü hızlı bir gelişme göstermiştir. Artan kâr oranları yatırımcıların bu sektöre olan ilgisini yükseltmiştir. Hatta sanayi sektöründe faaliyet gösteren pek çok firma inşaat sektöründeki pastadan pay almak için büyük projelere ve ortaklıklara dâhil olmuşlardır. Kapitalist sistemde, yüksek karlar kısa vadede çekici bir unsur gibi görünmekle birlikte uzun vadede geri dönüşü olmayan bir hasara neden olacaktır. Bunların başında tarım arazilerinin kaybı ve yeşil alanların beton ormanlarına dönüştürülmesi, İstanbul gibi bir şehrin siluetinin bozulması düşünülebilir. Bu çalışmada, Türkiye'de farklı illerde doğayla bütünleşmiş düşük katlı binalar/villalar inşa eden bir firma incelenmiştir. Firma, ankastre serisine buzdolabı da ilave ederek, sektörde rekabet avantajı elde etmeyi ve müşteri taleplerini artırmayı amaçlamaktadır. Ancak firma bunu yaparken kâr oranını düşürmek istememekte, hedef kitlesi olan müşterilerinin dikkatini çekecek bir tercih yapmayı arzu etmektedir. Çok sayıda artan ve azalan kriterin bir arada değerlendirilmesi için çok kriterli karar verme tekniklerinden biri olan VİKOR metodunun kullanılması uygun görülmüştür. Kriter ağırlıklarının sübjektifliğinin azaltılması amacıyla da AHP tekniği kullanılmıştır. Sonuçlar yönetim kurulu başkanı, mimarlar, satış müdürü, muhasebe müdürü ve pazarlama koordinatörü tarafından değerlendirilerek, uzlaşık bir karara ulaşılmıştır.