Person: ÜÇLER, Çağlar
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Çağlar
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ÜÇLER
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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.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 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.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.ArticlePublication Metadata only Remote customer interaction in frugal product development: model with customer evaluation(Inderscience Publishers, 2022) Gupta, R. K.; Üçler, Çağlar; Bernard, A.; Professional Flight Program; ÜÇLER, ÇağlarThe objective of this paper is to deliver an efficient structured methodology for spatially distributed but collaborative frugal product development to fulfil the requirements of emerging markets. The utilisation of local content, customer feedback, and preferences are respected to enable the customisation of products and attributes in the customer's environment. Virtual customer inspection tool based on augmented reality is developed and presented for remote customer interactions, recording feedback, preferences, and customisations. The developed tool enables the interaction of the customer with the product in digital, semi-finished, and finished form, which is capturing customer experiences, integrates geographical spread, and validates the product in the customer's environment. To achieve this, the tool uses intelligent decision-making with the incorporation of analytic hierarchy process, where satisfaction evaluation of the customer is used to achieve optimal requirements for frugal product development. The developed tool and associated remote virtual customer interactions are demonstrated with use cases.ArticlePublication Open Access Portfolio management for innovation ideas: weigthing antecedents with AHP(Beta Publishing, 2018) Üçler, Çağlar; Professional Flight Program; ÜÇLER, ÇağlarPurpose: The purpose of this paper is to determine whether there are antecedents of innovation, which can be looked at during idea evaluations at the fuzzy front end. Methodology: A systematic literature review was conducted for the antecedents of the innovation output, which were then verified and weighed by an integrated team of experts and academicians participating TIM’s InoSuit project by using AHP. Findings: The antecedents were isolated as value, applicability, contribution to innovation, generalization, strategy, risk, and suitability of existing solution, and their weights were determined as 12, 15, 10, 18, 8, 32, and 5 % respectfully. Practical Implications: This research provides an analytical assessment model for the initial idea selection for innovation, which can be used within innovation management systems. Originality: There is no comparable scale applicable to the selection in the very early phases of ideation.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 Extension of the virtual customer inspection for distant collaboration in NPD(IEEE, 2018-08-13) Gupta, R. K.; Üçler, Çağlar; Bernard, A.; Professional Flight Program; ÜÇLER, ÇağlarThe usage of holographic virtual customer inspections for gathering feedback during the production in the aviation industry was successfully demonstrated in Airbus, which implied the assessment of the requirements spanning the Kano dimensions and conjoint analysis of satisfaction and importance. A further extension is proposed here as a research in progress to enclose early phases in New Product Development throughout the manufacturing. Consequently, collaboration achievement is targeted here by the virtual inspection of digital mock-ups, semi-/ and finished products to enable the circulation of knowledge and exhibiting design iterations in set based models. Nevertheless, challenges are associated to the virtual inspection, which are derived from technological constraints or based on the nature of distant collaboration. An assessment of these challenges is made by means of a hierarchical aggregation to discuss conceptually the applicability of the extension, highlighting future research areas for this field as well.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 Involvement of the notifying body in the innovative development environment: lessons learnt from the development of green alternative cryogenic fuelling systems in multinational work groups(IEEE, 2014) Üçler, Çağlar; Professional Flight Program; ÜÇLER, ÇağlarTo reduce emissions alternative innovative fuel technologies like the usage of Liquefied Natural Gas (LNG) are focused on, which are not mature yet and there is a high level of uncertainty. The Notifying Body, which shall accept the design, is narrowing the envelope further by applying conservative approaches to protect the end users. There are several international parties involved in different stages of the development process. Motivated by these circumstances, an innovative development environment for high-tech industrial products has been proposed, incorporating the active participation of both the Notifying Body and the Customer, which validation is accomplished by a case study in the development of an alternative cryogenic LNG fueling system.