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A bayesian approach proposal for inventory cost and demand forecasting
(2015) Apak, Sinan
Endüstriyel pazardaki teknolojinin kalıcı değişikliğinin ve ürün modellerinin farklılığının, yedek parçalar için yapılan talep tahmini üzerinde önemli bir etkisi vardır. Ürünlerin gelecekteki talep oranlarını ortaya koymak amacıyla envanter yöneticileri kendi tahminlerini sürekli güncellemektedir. Bayes modeli, önsel olasılık dağılımı kullanarak kabul edilebilir oranı birkaç dönem üzerinden optimum hesap yapmak için kullanmaktadır. Ancak, aralıklı talep gibi muhtelif talep oranlarının altında, Bayes Modelinin performansı analiz edilmemiştir. Bir araştırma sorusu yardımıyla, bu çalışma bu durum incelenmektedir.
Çevik üretim yaklaşımının işletme performansına etkileri – otomotiv sektörü analizi
(R&S- Research Studies Anatolia Journal, 2022) Akpınarlı, Serhat; Apak, Sinan; Apak, Sinan
Bu çalışmada çeviklik yeteneklerinin işletme performansı üzerindeki etkilerinin incelenmesi amaçlanmıştır. Çalışmada ilişkisel tarama modeli benimsenmiştir. Çalışmanın örneklemini, otomotiv sektöründeki işletmelerden amaçlı örnekleme yöntemi ile seçilen 364 yönetici oluşturmaktadır. Araştırmada veri toplamak maksadıyla kullanılan ank?t f?rmunda ??m?gr?f?k ??ru??r, Çevik Üretim Yetenekleri Ö?ç?ğ? ve İşletme Performansı Ö?ç?ğ? ?u?unm?kt??ır. Verilerin analizinde SPSS v26 ve AMOS v20 yazılımları kullanılmıştır. Çalışma kapsamında geçerlilik analizi, güvenilirlik analizi, tanımlayıcı istatistiksel analizler, korelasyon analizi ve Yapısal Eşitlik Modellemesi gerçekleştirilmiştir. Analizler sonucunda çeviklik yeteneğinin işletme performansı üzerinde olumlu etkisinin olduğu belirlenmiştir. Çeviklik yetenekleri boyutlarının etkileri incelendiğinde ise işletme performansı üzerinde cevap verme, yetkinlik ve hızın olumlu yönde ve anlamlı etkilerinin olduğu, esnekliğin ise anlamlı bir etkisinin olmadığı belirlenmiştir. Sonuç olarak, çeviklik yeteneğinin işletme performansı üzerinde çok büyük etkisinin olduğu ve hızın bu ilişkideki en önemli bileşen olduğu, ancak çevikliği oluşturan diğer faktörlerin de göz ardı edilmemesi gerektiği ve işletmelerin çevik nitelik kazanarak bunu sürdürmesinin önem arz ettiği değerlendirilmektedir.
A comparative analysis of innovation and sustainable growth measurement in hospitality industry
(Semantic Scholar, 2017) Göğüş, Çağla Gizem; Apak, Sinan; Apak, Sinan
The paper focuses on consideration of how to use nine performance factors to monitor innovation and sustainability in a relevant and useful manner in hotel and restaurant industry. Integrated information on sustainable development of a hotel or restaurant is very essential for decision-making since it is difficult to evaluate the performance of a company on the ground of too many success indicators. The objective of the work first was to design a model for obtaining composite sustainable development criteria for hotels and restaurants. Second¸ was to compare importance of defined sustainable growth and innovation measurement criteria for restaurants, chain and boutique hotels. Hence, study initially investigate terms of “innovation and sustainability” in the hospitality (service) industry concepts to present a conceptual framework and a comparative study. This was applied by determining the impact of individual factors to the overall sustainability of a company using the concept of F-TOPSIS method.
A Decision Making Model for the Evaluation of Supply Chain Execution and Management Systems
(ATLANTIS PRESS, 2013) Apak, Sinan; Vayvay, Ozalp; Feyzioglu, Orhan; Apak, Sinan
A Supply Chain Execution and Management (SCEM) system is an enterprise application that integrates all of the necessary supply chain functions into a single system. These functions range from common ones such as warehouse and transportation management to less known ones such as demand management. In order to execute and manage the supply chain processes successfully, organisations need a comprehensive evaluation approach to determine the most suitable system. The evaluation of an SCEM system involves numerous decision making criteria. Moreover, it is usually characterised with uncertainty and vagueness since it is very difficult to rate SCEM system alternatives with exact terms. To cope with this problem, a fuzzy logic-based approach is developed in this study. This approach main integrates the Fuzzy Analytic Hierarchy Process to weight the decision criteria and the Fuzzy Technique for Order Preference by Similarity to Ideal Solution to rate alternatives. A real life example is provided to demonstrate the capability of the proposed approach.
Evaluating an intelligent business system with a fuzzy multi-criteria approach
(IEEE, 2009) Apak, Sinan; Vayvay, Özalp; Apak, Sinan
In this ever changing business structure, Intelligent Business System (IBS) is one of the survivals of a company, and the functions of information technology (IT) are becoming increasingly important. Evaluating the appropriate IBS for required conditions is the critical strategic decisions in formulating a business strategy. Although a number of factors were found to be influential in the choice of IBS. IBS evaluation is an inherently uncertain activity. To deal with the uncertainty in decision making, a fuzzy multi criteria decision making (FMCDM) method is adopted. This study presents an empirical approach of BIS evaluation and a real life evaluation process is presented to illustrate the effectiveness of the approach.
An Extended GRA Method Integrated with Fuzzy AHP to Construct a Multidimensional Index for Ranking Overall Energy Sustainability Performances
(MDPI, 2020) Altıntaş, Koray; Vayvay, Özalp; Apak, Sinan; Çobanoğlu, Emine
In an age of rapid technological advancement, the increasing need for energy and its related services to satisfy economic and social development has become a critical concern of national governments worldwide. This has triggered researchers to work on metrics for tracking and tracing energy sustainability in order to provide monitoring mechanisms for policy makers. In this regard, multicriteria decision-making (MCDM) methods are becoming more popular to deal with the multidimensional and complex nature of sustainability. We have proposed an extended and revised version of the grey relational analysis (GRA) method, which is integrated with the fuzzy analytic hierarchy process (AHP), to develop a new composite index for comparing the overall energy sustainability performances of 35 OECD member countries. Our case study revealed the performances of selected countries by providing their strengths and weaknesses based on determined criteria as well as the level of change in performances with different criteria weights. The proposed GRA model can be used in different applications of sustainability due to its flexible nature, which provides benefits from goal-oriented extensions in order to adequately capture different aspects of sustainability.
A fuzzy multi criteria decision making model approach for ranking automobile dealership selection criteria
(Sobiad, 2017) Apak, Sinan; Göğüş, Çağla Gizem; Apak, Sinan
This article aims to sort important key factors in the selection of automobile dealers that make sense for automobile dealers to understand what consumer aspects. Consumer preferences on dealer’s attributes that make consumer decision-making which easier will be identified by applying a fuzzy multi criteria decision making model. At the evaluation procedure, the F-AHP was applied to determine the relative weights of evaluation criteria. Managers should be able to strive for alignment within corporate branding by tracking the character of the supply-chain relationship and monitoring for discrepancies between corporate and dealer perspectives. The results will subject to the propositions being tested, make an important contribution in terms of confirming the impact of strategic collaboration, brand and dealer image, and distribution channels.
Innovation and sustainable growth measurement in hotel industry: A hierarchical decision making model
(ELSEVIER SCIENCE BV, 2013) Gogus, Gizem; Karakadilar, Ibrahim Sarper; Apak, Sinan; Apak, Sinan; Ozsahin, M
The paper focuses on consideration of how to use indicators to monitor innovation and sustainability in a relevant and useful manner in tourism industry. Integrated inthrmation on sustainable development of a hotel is very essential for decision-making since it is very difficult to evaluate the performance of the company on the ground of too many indicators. The objective of the work was to design a model for obtaining composite sustainable development criteria in order to measurement on sustainable growth and innovation. Hence, study initially investigates the terms of "innovation and sustainability" in the tourism (service) industry concepts to present a conceptual framework. This was applied by determining the impact of individual indicator to the overall sustainability of a company using the concept of analytic hierarchy process.
Innovation decision of export companies and effect on firms financial performance
(Banking University, 2019) Fulya, Taşel; Bayarçelik Beyza, Ebru; Apak, Sinan
Innovation is a very important subject for companies especially for developing new products, finding new methods of production, satisfying the consumers’ needs, decreasing costs and gaining competitive advantage. Companies can survive by the help of innovation improvement because that it provides continuous progress, which enables companies to grow faster, become more efficient and more profitable than companies, which do not make innovation. Particularly for exporting companies’ innovation gains much more importance because of shortening product life cycle and increasing competition in global environment. There are numerous studies that investigates the relation between innovation and firm performance. Research results have shown that innovation influences firm performance in different ways such as; entering the market for the first time with an innovative product allow companies to obtain relatively high profits; the number of innovations completed by companies had a positive impact on the operating profit margin; high product innovativeness had positive affect on the sustainable profitability in longitudinal researches; companies’ technical and administrative innovation have also positive affect on firm performance. Therefore, due to the higher uncertainty in business environment, it is crucial to identify the criteria for innovation decision and analyze the effects on firms’ financial performance. In this study, main objective is to find out the most important criteria for innovation decision that affects financial performance in Turkish export companies. The authors identified the innovation decision criteria according to the recent studies that explore the relation between innovation and firm performance. Decision model consists of three main criteria as; firm structure, economic and internal environment criteria and nine sub-criteria as; experience, financial structure, crisis & instability, market demand, governmental policies, competition, human capital & education, research & development capability and organizational culture. Analytical Network Process (ANP) method used to select the best alternatives evaluated with respect to nine criteria.
Innovation factors in service industry and knowledge based economy
(Press Academia, 2016) Bayarçelik Beyza, Ebru; Tasel, Fulya; Apak, Sinan; Apak, Sinan
Innovation has become one of the most important driver of today’s service industry, which plays a key role in knowledge-based economy. In literature generally researches have been emphasized on innovation determinants on manufacturing industry and less concentration on service innovation factors. So this study aims to find out innovation decision factors in service industry by using DEMATEL method. The method was used to analyze the causal relationships and prioritize the importance of innovation factors in logistics industry by applying questionnaire to logistics professionals. Research findings show that research and development is the most important criteria for logistics industry, which also affects knowledge-based economy.
A literature review on green innovation and sustainable growth
(Maltepe Üniversitesi, 2018) Taşel, Fulya; Apak, Sinan; Küçük, Burak; Apak, Sinan
To achieve sustainable growth environmental factors plays an important role. Environmental issues are very important for consumers, companies and also for countries. Companies are trying to achieve new improvements for their products and/or processes to decrease their costs, to differentiate their products or to satisfy consumer needs etc.. Innovation is a critical factor for development. The aim of this research is to make a short literature review and figure out the importance of innovation that focuses environmentally effective developments which is called green innovation. There are various studies in literature about green innovation that concentrates on current and future environmental issues and reducing energy and resource consumption.
Multi-dimensional competency assessment: an application in aircraft maintenance organization
(Press Academia, 2021) Saitoğlu, Ferit; Apak, Sinan; Apak, Sinan
Amaç- Bakım faaliyetlerinin etkinliği ise bakım personelinin yetkinliği ile bağlantılıdır. Farklı operasyonel koşullarda, çeşitli yetkinlik tiplerinde ve karmaşık sistemlere sahip uçaklar üzerinde personel yetkinliğinin hangi yönde geliştirilmesi gerektiğine karar vermek zor bir süreçtir. Bu çalışmada, personel yetkinliğinin hangi yönde geliştirileceğine karar vermek için, sürecin tüm boyutlarını değerlendirerek doğru uçak sistemini seçebilmek amacıyla kullanılabilecek modeli oluşturmak amaçlanmıştır. Yöntem- Bu araştırma kapsamında birebir görüşmeler yapılmış, risk analizi ve anket uygulanmıştır. ÇKKV yöntemlerinden olan AHP, TOPSIS ve VIKOR’dan faydalanılarak uçak sistemlerinin nihai önem sıralaması elde edilmiştir. Bulgular- Araştırma bulguları personel yetkinliğinin geliştirilmesi için önemli olan uçak sistemlerinin belirlenmesinde tek bir parametreye bakılamayacağını göstermiştir. Doğru uçak sistemini seçmek için bakımın etkinliğini gösteren tüm boyutların sürece dahil edilmesi gerekmektedir. Sonuç- Önem sırasına göre seçilen uçak sistemleriyle anket sonuçları eşleştirildiğinde elde edilen sonuçlar bakım personelinin yetkinliğini geliştirmek için üzerinde durulması gereken noktaları ortaya çıkarmıştır. Bu sonuç geliştirilen modelin ÇKKV yöntemlerinden AHP, TOPSIS ve VIKOR ile birlikte kullanılabileceğini göstermiştir.
A new systematic approach for warehouse management system evaluation
(UNIV OSIJEK, TECH FAC, 2016) Apak, Sinan; Tozan, Hakan; Vayvay, Ozalp
Warehouse management is one of the most important legs in supply chain operations and production management. To support that warehouse execution, a warehouse management system is required. Many warehouses have used various methods to handle this difficult and time consuming evaluation process. The purpose of this paper is to provide a decision support model to make a careful evaluation of warehouse management system. Purchasing an appropriate warehouse management system in a supply value chain is not an easy decision making and is related to fuzziness and uncertainty, which should be considered as a large number of complex factors in multiple evaluation criteria. A Fuzzy Multi Criteria Decision Making approach is adopted to effectively evaluate warehouse management systems. To provide a practical guidance for other companies a real life framework is presented with an application.
PANDEMİ DÖNEMİNDE YALIN ÜRETİM UYGULAMALARININ ÖNCELİKLENDİRİLMESİ: OTOMOTİV PARÇASI ÜRETİCİLERİ ÖRNEĞİ
(2022) Apak, Sinan
Küresel Covid-19 pandemisinin etkisi birçok otomotiv parçası imalatı yapan işletmenin üretimine ara vermesine neden olmuştur. Sürdürülebilir üretimin en iyi araçlarından biri olan yalın üretim bu noktada daha fazla önem kazanmıştır. Hammadde stoğunun azalması yer yer bitmesi üretim sürecinde aksamalara sebebiyet vermiş, müşteri talebinin karşılanamamasına neden olmuştur. Hâlihazırda yalın üretim felsefesini benimsemiş işletmeler yalın uygulamalarına daha çok önem göstermektedir. Bu çalışma da bu süreç içerisinde otomotiv parçası üreten işletmelerin hangi yalın üretim araçlarını öncelikli olarak kullandıklarını tespit etmeye yönelik araştırma yapmıştır. Araştırma yalın üretim araçlarını kullandığını belirten 42 otomotiv parçası üreticisi işletmenin üretim mühendislerini yönelimlerini göstermektedir. Yalın üretim araçlarının bu süreç içerisinde tercih edilmesini yorumlayıcı yapısal model kullanarak açıklayan anket çalışması sonucunda pandemi sürecinde en çok tercih edilen yalın üretim aracının toplam verimli bakım ve hata önleme sistemleri olduğu ortaya çıkmıştır. Bunun nedenleri yorumlandığında boşta duran makinalara bakım yapılacağı ve üretim esnasında olabilecek bir arızada gerekli tamir parçasının tedariğinin geç gelebileceğinden dolayı periyodik bakıma önem verildiğidir. Bir ikinci yalın üretim aracı da hata önleme sistemidir. Süreçlerindeki iyileştirmelerde poke-yoke araçlarını geliştirdikleri ortaya çıkmıştır. Kullanılan modelin işlerliği, pandemi sürecinde otomotiv parçası üretimi yapan işletmelerin üretimi sekteye uğratan durumların önüne geçmesi yönünden hem literatüre hem de sektöre katkı sağlamaktadır.
PRIORITIZING INNOVATION FACTORS BY USING ANALYTIC NETWORK PROCESS
(2019) Apak, Sinan; Bayarçelik, Ebru; Taşel, Fulya
The emergence and development of the fourth industrial revolution affects production systems.This new revolution also has an impact on logistics, which has a direct relationship withproduction. Organizations give importance on innovation, technological change and productdifferentiation to compete with their rivals. Innovativeness creates better understanding ofcustomer needs and wants, catch up their rivals and become more proactive in seeking the marketopportunities for organizations. Therefore, improving logistics services using innovations canhelp improving strong customer relationships, derive barriers to competition, increase customerloyalty, change costs and conduct market activities more effectively. In this context, theobjective of this study is to prioritize the innovation factors in logistics industry using a pairwisecomprehensive method named Analytic Network Process (ANP). This model is proposed todefine a ranking between selected criteria for innovation based decisions. This methodologydemonstrates, which criteria has the most important role in the innovation processes.
A Research on Determining Innovation Factors for SMEs
(ELSEVIER SCIENCE BV, 2014) Bayarcelik, Ebru Beyza; Tasel, Fulya; Apak, Sinan; Apak, Sinan; Ozsahin, M
SMEs are the essential elements of the economy which is responsible for driving innovation and competition in many economic sectors. To be a competitor in such economies those SMEs should support strategic management decisions successfully. The problem could be in decision phase according to market conditions with many external and internal factors. To cope with ambiguity executives have to consider appropriate strategies. Due to this difficult and time consuming evaluation process, this paper is focusing on determining to find some case-based strategic innovation success factors. A decision making approach is adopted to effectively evaluate those strategic innovation factors. (C) 2014 The Authors. Published by Elsevier Ltd.
Simulation based optimization for World Line Card production system
(OJS/PKP, 2012) Apak, Sinan; Apak, Sinan
Simulation based decision support system is one of the most commonly used tools to examine complex production systems. The simulation approach provides process modules which can be adjusted with certain parameters by using data relatively easily obtainable in production process. World Line Card production system simulation is developed to evaluate the optimality of existing production line via using discrete event simulation model with variety of alternative proposals. The current production system is analysed by a simulation model emphasizing the bottlenecks and the poorly utilized production line. Our analysis identified some improvements and efficient solutions for the existing system.
Using dematel-anp integrated approach to decide for the productions strategy of a production line
(BMIJ, 2017) Apak, Sinan; Çete, Rüya; Apak, Sinan
Production planning includes push, pull and hybrid production systems that production firms determine their production strategies according to many variables before starting production. The administration of this process requires experience and time. The intensity of rivalry makes this kind of decision processes impo rtant because no firm has the luxury to waste time and to make a wrong decision. In order to solve this problem, the research proposes to use integrated decision-making trial and evaluation laboratory (DEMATEL) and analytic network process (ANP) together which are methods of multi-criteria decision-making models. The process used to establish which options are the most acceptable for operations managers demonstrates how applicable it is by using the generated model in the automotive industry.
USING DEMATEL-ANP INTEGRATEDAPPROACH TO DECIDE FOR THE PRODUCTION STRATEGY OF A PRODUCTION LINE
(2017) Çete, Rüya; Apak, Sinan
Üretim firmaları üretime başlamadan önce üretim stratejilerini birçok değişkene göre belirleyerek itme, çekme ve hibrit üretim sistemlerini içeren üretim planlamayı kullanır. Bu sürecin yönetimi deneyim ve zaman gerektirir. Rekabet yoğunluğu, bu tür karar süreçlerini önemli kılar, çünkü hiçbir firmanın zaman kaybetme ve yanlış karar verme lüksü yoktur. Bu sorunun çözümü için araştırma, çok kriterli karar verme modeli yön temleri olan bütünleşik DEMATEL ve ANP'yi birlik te k ullanmayı önermek tedir. Hangi seçenek lerin işletme yöneti c i l e ri için en kabul edilebilir olduğu tespit etmek için kullanılan süreç, otomotiv endüstrisinde üretilen modelin uygulanması ile ne kadar uygulanabilir olduğunu göstermektedir.

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