Browsing by Subject "Service"

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Open Access
Analysis of the (Q, r) inventory model for perishables with positive lead times and lost sales
(Institute for Operations Research and the Management Sciences (INFORMS), 2008) Berk, E.; Gürler, Ü.
We consider a perishable inventory system with Poisson demands, fixed shelf lives, constant lead times, and lost sales in the presence of nonnegligible fixed ordering costs. The inventory control policy employed is the continuous-review (Q, r) policy, where r < Q. The system is modeled using an embedded Markov process approach by introducing the concept of the effective shelf life of a batch in use. Using the stationary distribution of the effective shelf life, we obtain the expressions for the operating characteristics and construct the expected cost rate function for the inventory system. Our numerical study indicates that the determination of the policy parameters exactly as modeled herein results in significant improvements in cost rates with respect to a previously proposed heuristic. We also compare the (Q, r) policy with respect to a time-based benchmark policy and find that the (Q, r) policy might be impractical for rare events, but overall appears to be a good heuristic policy.
Open Access
Applied Materials uses operations research to design its service and parts network
(Institute for Operations Research and the Management Sciences (INFORMS), 2010) Şen, A.; Bhatia, D.; Doǧan, K.
Applied Materials Inc. is the global leader in nanomanufacturing technology solutions. It has a broad portfolio of innovative equipment, service, and software products and supports its customers worldwide with an extensive service and parts network with more than 100 locations. At the end of 2006, Applied Materials decided to evaluate and rationalize the design of its North American network. It set up a detailed optimization model (including 50,000 parts) to develop a network and distribution strategy. To our knowledge, this is the first large-scale multiechelon network-design model that incorporates safety stock inventory costs while considering the effects of lead time and risk pooling. The company used the model's recommendations to reduce costs while maintaining or improving its service to customers. The recommendations included simplifying the distribution network by consolidating depot locations for specific customers and skipping an echelon for others, thus leading to a projected inventory reduction of $10 million. The company is currently implementing these recommendations and has already eliminated five depots. Applied Materials estimates that during the first year of implementation, inventory reductions of $5.24 million and total savings of $1.1 million can be attributed to these network changes.
Open Access
CAS reflection implementation at six international baccalaureate diploma programme schools in Turkey
(2015) Perry, Stirling
The Creativity, Action, Service (CAS) program is a required experiential learning element of the International Baccalaureate (IB) Diploma Programme (DP) curriculum. As a means of connecting their experiences with learning, students are required to reflect on their CAS activities. If reflection is not implemented effectively, then students are less likely to internalize the lessons they learn from their experiences. This study examined the ways in which CAS program reflection was implemented at six IBDP schools in Turkey. With a research colleague, I visited the six schools, gathering data from interviews with students, teachers, and administrators, as well as collecting a number of documents related to their CAS programs. According to other research, effective reflection should be implemented using a variety of methods, should occur before, during, and after an experience, and should involve regular feedback from advisors/teachers. The results of my research show that most schools rely primarily on simplistic forms, which do not encourage much authentic reflection, such as periodic essays or verbal interactions between advisors/teachers and students, which can be effective if done correctly. Some aspects of reflection implementation at many schools do not align with the recommendations of prior research. As such, I have made certain prescriptions as to how reflection should be implemented, based on my own and others’ research. Key words: creativity, action, service, CAS, International Baccalaureate, IB, Diploma Programme, DP, reflection, implementation, Turkey, school, experiential learning.
Open Access
Community service learning in international context: a cross-case analysis
(2016-06) Uzun, Nurgül
Although there are a number of private-schools that implement service-learning activities within the framework of their international curricula, service-learning is a relatively new concept in public schools in Turkey. The purpose of this study is to use cross-case analysis for exploring and analyzing service-learning initiatives conducted in high school contexts in a variety of countries. To this end, the study aims to identify second-order constructs in selected cases relation to purposes, outcomes, challenges, curriculum integration, effects, opportunities, civic-international mindedness, Creativity, Action, Service (CAS) learning aims and outcomes. The study also intends to use multiple conceptual lenses to interpret the cross-case analyses for informing the practice of service learning. To this end, the researcher primarily utilizes Butin’s conceptual model to develop third-order constructs. The researcher also uses the concepts stemming from character education to further inform practice, such as values education, social-emotional learning and citizenship education. Findings provide insights into the content, processes and outcomes of service learning.
Open Access
Entropy service for secure real-time missioncritical communications
(John Wiley and Sons, Ltd, 2022-08-05) Turk, Y.; Tasbag, Yaman Yagiz; Zeydan, E.
Real Time Mission Critical Communication (RTMCC) in emergency situations can include real-time video and audio calls between peers and first responders all occurring simultaneously. RTMCC also requires secure end-to-end (E2E) group communication (GC) sessions against potential security threats during such incidents. In this paper, we explore all aspects of the possible methods that are suitable for a software implementation of for session key change during GC in E2E encryption of RTMCC. Later, we introduce our Entropy Service concept, which can be very effective in secure E2E RTMCC sessions. The proposed method ensures E2E security in real-time communication systems while allowing very fast session key change for clients involved in an RTMCC session with a computational complexity of 𝒪(1). Our experimental results show that the proposed Entropy Service can reduce total time by 99.6% and 99.2%, the idle time by 99.4% and 98.99%, and the number of messages by 51.4% and 35.33% compared to the key refreshing and hash methods, respectively, when the number of users in the system increases to 45. These results show that both communication and computation complexity are significantly reduced with the proposed RTMCC session key change.
Open Access
Exploring local and global ideals of beauty in Turkey : discourses and practices of plastic surgery patients and physicians
(2008) Tarı, Berna
Intrigued by an increase in demand for aesthetic operations all over the world, this study offers an in-depth investigation of plastic surgery as a consumption phenomenon. First, it looks at how local and global notions of the beautiful are negotiated in Turkey through consumption and marketing of aesthetic operations. Second, it looks at the nature of a service relationship formed between the surgeon and the patient-consumer, and how this relationship is constructed and maintained. Gazi University Hospital was chosen as the ethnographic research site. Results indicate that beauty is perceived as something that individuals improve, upgrade, and refine through time. Potential patients tend to have one of two ideals: The individual’s own younger appearance or someone else’s appearance. The ideal presented in the media is changing, making the target both difficult to achieve and difficult to catch. Here it is also possible to talk about a marketing process initiated and maintained by doctors and aesthetic medical companies at a global level. Neither the dominant logic nor the new logic of marketing can satisfactorily explain patient-consumers’ behavior in this context, where boundaries for the product cannot be established and there is considerably higher risk compared to other purchasing situations. It is possible to talk about doctor branding in this context, where brand positioning and brand image cannot be static since doctors are also people. Moreover, patient satisfaction has longitudinal and interpersonal characteristics since it involves the approval of others.
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Gelik Lokantası ve tarihi
(Bilkent University, 2020) Şen, Mert; Demirkırkan, Ege; İbiş, Arda Atahan; Sezer, Zekiye Bersu; Özkara, Dora
Gelik Lokantası İstanbul’un köklü ve saygın bir lokantasıdır. 1972’den beri varlığını sürdürmektedir. Ünlü bir iş adamı olan Ömer Duruk ve aşçılık mesleğinde çalışan İbrahim Denizer ortaklığında kurulan lokantanın temelinde yatan prensipler, kalitenin öncelikli tutulmasını sağlamıştır. Gelik Lokantası işletmede ve yemeklerinde özgün bir kimlik oluşturarak Türk mutfağına çeşitli tatlar katmış ve Türk lokanta kültürünün gelişmesine büyük katkılarda bulunmuştur. Böylece Gelik ismi bir sembol haline dönüşmüştür. Gelik Lokantası elde ettiği başarı ile diğer lokantalara örnek olmuş, birçok insan yetiştirmiştir. Birçok olaya ve ünlü isme misafirlik eden Gelik Lokantası nesilden nesile aktarılan bir tarihi yaşatmaktadır.
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Lions Kulübü'nün perde arkası
(Bilkent University, 2021) Sürer, Ekin; Saydam, Armağan Berkay; Demirci, Mustafa Can; Kalender, İzzet Can; Meşeci, Ahmet Nejdet
Kuruluşu aslen uluslararası bir temele dayanan, 1963 yılı itibariyle Türkiye’de de faaliyet göstermeye başlayan Lions Kulübü, kâr amacı güdümünden uzak bir yardım kuruluşudur. İçinde Türkiye’nin de bulunduğu iki yüzden fazla ülkede varlığını beyan eden topluluğun ana ideolojisi, hakkaniyetli bir hizmet doğrultusunda çeşitli toplumların gelişimini sağlamak ve gönüllük ilkesini öncelikli olarak esas alan bu yardımlaşma ruhunu sürdürülebilir bir hâle getirmektir. Bir nevi hiyerarşik disiplin şemasıyla yürütülen kulüp, özgün kuralları ve demokratik yönetimiyle amacı olan yardımlaşmayı gerçekleştirir. Eşitlik ilkesi kulübün kesintisiz işleyişini sürdürmesini sağlar. Günümüzde ise Lions Kulübü, vizyonu ve misyonu bağlamında gerçekleştirdiği global faaliyetlerinin yanı sıra, Türkiye’nin siyasi merkezi olan başkent Ankara’da hayata geçirdiği aktiviteleriyle de amacı doğrultusunda ilerlemeye devam etmektedir.
Open Access
Service quality in a commercial bank - a case study
(1995) Genç, Pelin
In tlie service sector, in tlie environments where tlie rivalry is very intense and the pioclucts are similar, in order for a firm to have a strong position in the sector with respect to its competitors, delivering quality service should be its distinctive competence. In this study, a real life example from banking sector, Interbank is analyzed. I’hc study aims at demonstrating the importance of delivering quality service for a firm to succeed in a competitive environment. Gaps that obstruct delivering service quality and the causes of those gaps arc investigated, and suggestions to eliminate them are made.
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Türk mutfağında baklavanın yeri ve Koçak Baklava
(Bilkent University, 2020) Işıksaçan, Hazal; Karaçay, Güney; Akay, Mehmet Akif; Ünalan, Gökçe; Eser, Osman Nuri
Tatlıların sultanı unvanını almış olan “baklava”, Türk kültürünün geçmişten başlayıp günümüzde hâlâ önemini koruyan kültürel bir değeridir. Osmanlı mutfak kültüründe de çok önemli bir yeri olan baklava, günümüzde hem ülke içinde hem ülke dışında sevilerek tüketilmektedir. 1993 yılından bu yana hizmet vermekte olan ve kalitesiyle ön plana çıkan Koçak Baklava, bu hizmetini aynı özenle 27 yıldır devam ettirmektedir. Yenilikçi bir anlayışa sahip olan Koçak ailesi, baklavacılığın püf noktalarının yeni nesillere doğru bir şekilde aktarılarak bu kültürün aynı kalitede devam etmesini hedeflemektedir. Bu çalışmada Koçak ailesinin bu sektöre nasıl giriş yaptığı ve Koçak Baklava’nın kuruluş hikâyesi anlatılmıştır. Ayrıca Koçak Baklava’nın markalaşma süreci, sektördeki konumu, geleceğe yönelik planları ve yenilikçi yaklaşımları da bu çalışmada yer almaktadır.