Person: ÜÇLER, Çağlar
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Çağlar
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ÜÇLER
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ArticlePublication Metadata only Stress among ab-initio pilots: A model of contributing factors by AHP(Elsevier, 2019-09) Kılıç, Bilal; Üçler, Çağlar; Professional Flight Program; KILIÇ, Bilal; ÜÇLER, ÇağlarHuman error in the cockpit triggers a chain of incidences, which might lead in aviation to fatal consequences. Indeed, it is the highest contributor to aviation accidents, where stress is correlated positively. Despite the large research base for commercial or military pilots, there is no study related to the workplace stressors of ab-initio pilots. With these considerations in mind, the present study is set out to explore stress factors among ab-initio pilots in the university. For this purpose, stressors were isolated and assessed by interviews with flight instructors. Then, the analytical hierarchy process (AHP) is applied to weigh those stressors among ab-initio pilots. A hierarchy was built with 3 criteria and 12 sub-criteria. Results showed that the most important criterion in stress among ab-initio pilots is personal factors, followed by organizational factors and environmental factors. Furthermore, the results revealed that the first four stressors within the global ranking were determined as the lack in body of knowledge, meteorological conditions, personality, and facilities and the fleet with the weights of 0.195, 0.154, 0.11 and 0.109. This work is unique due to its coverage of ab-initio pilots, and the results presented here may facilitate improvements in the evaluation of individual ab-initio pilots and the teaching environment for stress contributing factors.ReviewPublication Open Access Airspace deregulation for UAM: Self-organizing VTOLs in metropoles(University Aviation Association, 2022) Aldemir, Hüseyin Önder; Üçler, Çağlar; Professional Flight Program; Aviation Management; ALDEMİR, Hüseyin Önder; ÜÇLER, ÇağlarSmall-scale aviation has been driven extensively by recent technological developments. Distinct micro/small scale mobility modes are being interlined, where automated Vertical Take-Off and Landing Aircraft (VTOLs) are being conceptualized for Urban Air Mobility (UAM) in the form of air taxi, cargo, disaster relief, or medical help. This implicates many simultaneous flights over cities, which is a significant challenge. Traditional air traffic control is customized for commercial aviation, and it is not suitable for the dynamic variation in the flight routes of UAM. Consequently, a literature review is conducted firstly for air traffic management subject to UAM. Then, as a critical finding, a self-organizing model integrating particularly micro/small scale UAM is proposed utilizing the swarm concept to leverage the autonomous behavior of VTOLs. Rules for self-organization are set, which are then discussed in conjunction with available technologies such as Global Positioning System (GPS) and Traffic Alert and Collision Avoidance System (TCAS). Finally, the basic concept definition is elaborated to determine challenges and future research.Conference ObjectPublication Metadata only Digital technology and the stages of digital business transformation(IEEE, 2022) Mutlu, Irmak; den Hartigh, Erik; Üçler, Çağlar; Entrepreneurship; Professional Flight Program; HARTIGH, Erık Den; ÜÇLER, Çağlar; Mutlu, IrmakCompanies use digital technology to transform their business. Digitization, digitalization, and digital transformation have been proposed as stages in this business transformation process. Researchers have also proposed a variety of maturity models to assess this transformation. The distinctions and the ontology between the stages of digital transformation are not always clearly defined. Using expert interviews and literature review this paper derived a domain-specific ontology from commonly expressed keywords. Based on this, five stages of digital transformation were distinguished and defined: (i) digital passive, (ii) digitization, (iii) digitalization, (iv) digital transition and (v) digital transformation. These five stages may be used in further research as a rubric to assess digital business transformation.Book PartPublication Metadata only From lean towards frugal product development(IGI Global, 2020-11-06) Üçler, Çağlar; Gupta, R. K.; Professional Flight Program; ÜÇLER, ÇağlarFrugal innovation is considered as a disruptive growth strategy for businesses that focuses on the utilization of limited resources of rural areas. Similarly, lean management targets to develop new products in accordance with the customer requirements while managing the wastage. The purpose of this chapter is to highlight a pathway to frugal product development through lean management experiences. This is particularly of interest to developing territories and rural areas due to their innate characteristics. The analysis highlighted that innovation ideas have high diffusion rates if the product configuration is properly conducted. Despite the common objectives of lean and frugal development, this chapter investigates distinguishing features and conducts a comparison of both methodologies in order to provide specific guidance for companies that follow lean management to capture the benefits of frugal product development.ArticlePublication Open Access Traveler's idle time and the value chain at airports(Milli Savunma Üniversitesi Hezârfen Havacılık ve Uzay Teknolojileri Enstitüsü, 2015-07-23) Üçler, Çağlar; Martin-Domingo, Luis; Professional Flight Program; Aviation Management; ÜÇLER, Çağlar; DOMINGO, Luıs MartınThere is a high growth in the air traffic supported by the global trade and tourism and due to airport congestion travelers are spending more time at airports, which are competing to attract airlines with lower aeronautical costs reducing their profitability. The growing transit time spent at airports together with the waiting time in front of check-in, passport, security control or baggage claim is an idle time of the air traveler, which is not generating any value. The perception of waiting is also mostly negative, that the associated airports are disliked, leading to loss of revenue in commercial offerings. Another problem is that due to the high variety in the customer profile, the shops at the airports need to carry a high inventory over a wide spectrum of items required, which is not creating any value as well. Thus in order to deliver a sustainable value chain at the airport, an innovative customer focused integrated approach is proposed herewith, based on a smart phone platform called Gate Ø, facilitating the idle times of the air traveler. This strategic approach is evaluated successfully within a value chain analysis showing up its potential across the value chain stakeholders.ArticlePublication Open Access Customer-focused aircraft seat design: A case study with AHP-QFD(Vilnius Gediminas Technical University, 2023-11-23) Yilmaz Çetin, A.; Üçler, Çağlar; Professional Flight Program; ÜÇLER, ÇağlarAviation is rapidly expanding and recovering from the pandemic impact driven by the experience economy. This is particularly subject to interfaces such as the aircraft seats, which are getting intense attention as a differentiator in the cabin. The focal point of this paper is to assess and convert customer requirements into what must be done for an optimum aircraft seat. To achieve this, a 2-step analytic hierarchy process and quality function deployment (AHP-QFD) methodology was successfully applied, consolidating product quality characteristics. Then, it leverages a novel scoring method of interdependencies to isolate dependable design variables. Consequently, safety, weight, and durability scored maximum, emphasizing backrest design and alternative composite materials, while test infrastructure was determined as a critical investment component. Furthermore, it is shown how AHP-QFD can be used for product strategy and strategic portfolio management of R&D projects.Conference ObjectPublication Metadata only Intelligent self-adaptive decision model for product innovation in FE(IEEE, 2018-07-02) Kurt, O. E.; Üçler, Çağlar; Vayvay, O.; Professional Flight Program; ÜÇLER, ÇağlarCompanies need New Product Development (NPD) more than ever to satisfy rapidly changing customer needs, to secure and increase their share in the global market. Continuous innovation stream is required to succeed there with best promising ideas to be selected at the fuzzy Front End (FFE). The fuzziness of FE is remedied here by creating an intelligent, self-adaptive and flexible decision model The proposed model is non-bureaucratic, manages fuzziness, and it is capable to provide insight for future trends Furthermore, it contributes to knowledge accumulation by maintaining all data of ideas, both accepted or rejected, enabling knowledge based design. The intelligent is provided by the growth of idea, their computation and assessment. I.e. the model itself weighs ideas independently and adaptively by respecting the size and population of the associated idea group. This is achieved by using K-means clustering algorithm by which meaningful changes in accumulated ideas are detected to calculate trend. The synthesized model supports managers and researchers to organize the FFE.ArticlePublication Open Access Innovation at airports: A systematic literature review (2000–2019)(Vilnius Gediminas Technical University, 2021-09-29) Kılıç, Sena; Üçler, Çağlar; Martin-Domingo, Luis; Professional Flight Program; Aviation Management; ÜÇLER, Çağlar; DOMINGO, Luıs Martın; KILIÇ, SenaAirports operate in a highly-competitive and challenging environment. Therefore, in order to remain competitive, innovation is imperative for airports. This paper aims to conduct academic research into innovation at airports by reviewing studies published from 2000 to 2019 for presenting key findings. A systematic literature review was made based on scientific papers indexed in Scopus with the keywords innovation and airport in the title, abstract or keywords sections, consolidating the innovation focus, approach and degree discussed with respect to innovation areas and territorial focal points. Consequently, it was found that research on airport innovation is: (i) mainly focused on products/services, (ii) concerned with leveraging ICT (Informatıon Communication Technology), (iii) implemented ad-hoc without a consolidated strategic approach, and (iv) lacks the input of external innovation scholars and specialists.Conference ObjectPublication Metadata only Assessment of using electric pumps on hybrid rockets(American Institute of Aeronautics and Astronautics Inc, AIAA, 2019) Gegeoglu, K.; Kahraman, M.; Üçler, Çağlar; Karabeyoglu, A.; Professional Flight Program; ÜÇLER, ÇağlarIn small hybrid rockets, liquid oxidizer is fed into the combustion chamber by pressurizing the oxidizer tank to achieve the desired injector pressure. However, larger applications employ propellant pumps to keep the propellant tank mass at reasonable levels. Conventionally, pumps are implemented on rockets by means of turbopumps. However, turbopumps are complex systems with serious development time and costs. With the current advancements in batteries and electrical machinery, pumps driven by electric motors become viable actors. In the case of hybrid rockets, operation of a single liquid propellant with a single pump has significant advantages compared to their use in the bipropellant liquid engines. In this paper, an example case of an upper stage hybrid rocket system is introduced and a propellant pump is designed using CFD modeling. The advantage of using electric motor driven pumps has been established via weight analysis and a comparison between alternative feed systems. Turbopump system is not considered due to its complexity as an alternative system. Therefore, comparison is limited to the cold gas pressurization feed system. It has been shown that a significant advantage in total feed system weight is achieved not only with a high-head pump but also with a low-head pump with assistive pressurization. A 69.9 % mass reduction for double-stage pump system and a 45.2 % mass reduction for the single-stage pump system was calculated compared to the reference pressure-fed system.Conference ObjectPublication Metadata only Enablers for industry 4.0(IEEE, 2018-12-10) Havle, Celal Alpay; Üçler, Çağlar; Professional Flight Program; HAVLE, Celal Alpay; ÜÇLER, ÇağlarBoth, globalization and technological advancements do motivate manufacturing organizations to adopt Industry 4.0 practices. It implies an evolutional transformation, which aggregates advanced technologies and cyber-physical interactions. Some of required capabilities are already existing in companies, but some have to be developed/ adopted. The purpose of this paper is to isolate these enables required for Industry 4.0. Consequently, extensive literature review was carried out to synthesize the enablers for Industry 4.0, which are further grouped in an associated Mind Map. The main enablers were isolated as human, organization and technology in the higher level with associated subordinated enablers in an organized manner. The scientific implication is that this Mind Map can be used in analysis, when introducing weighs and importance factors. Practically, the mind map embodies a body of knowledge, i.e. the enablers, that have to be internalized by managers to achieve Industry 4.0 practices. Existing Industry 4.0 research is either focusing on partial topics in depth, or it gives a general overview of readiness for Industry 4.0, which is a wide collection of factors. To our best knowledge there is no similar work guiding throughout enablers visually, easing the adaptation process.