05. Fakülteler

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Citation - Scopus: 5
Achieving Shojinka by Integrated Balancing of Multiple Straight Lines With Resource Dependent Task Times
(Springer New York LLC, 2019) Atasagun, Y.; Kara, Y.; Can Atasagun, Gözde
The concept of Shojinka, which is an important element of Just in Time production system, is attaining flexibility on the number of workers in a workshop due to demand variations. Even though Just in Time production system adopts U-shaped line layout, traditional straight lines can be combined and balanced in an integrated manner to obtain the advantages of Shojinka. In this case, the problem, which is called Integrated Balancing of Multiple Straight Lines, arises. On the other hand, the basic assumption of assembly line balancing is that every task’s time is fixed. However, in practice, different resource alternatives such as equipment or assistant worker may be available to process a task with different times. The problem in this case is to assign tasks and resources to stations that minimise total cost. In this study, a binary integer mathematical model is presented for integrated balancing of multiple straight lines, assuming that task times are resource dependent. The proposed model is illustrated and validated using several examples. An experimental analysis is also conducted to emphasize the advantages of the integrated balancing concept, compared to the situation in which the lines are balanced independent from each other. The experimental results show that, when multiple straight assembly lines are balanced in an integrated manner with resource dependent task times, an average total cost improvement of 23.105% can be obtained compared to the independent balances of the lines. This is a significant improvement that emphasizes the importance of balancing multiple straight lines in an integrated manner, to take the advantages of shojinka and to adhere to the main philosophy of Just in Time. © Springer Nature Switzerland AG 2019.
Citation - Scopus: 2
Advanced Applications of Green Materials for Gas Separation and Storage
(Elsevier, 2020) Kırbıyık Kurukavak, Çisem; Kuş, Mahmut
Extraordinary increase in global energy demand and supply, thus the environmental pollution, is one of the most important problem for today’s modern life. Gas separation and storage applications are closely related to control of the greenhouse gas and to use of clean and renewable energy. The development of green materials with desired combination properties and corresponding methods for target applications, which can minimize the environmental impact by using renewable sources has been having a growing attention over the last decades. Green and eco-friendly techniques, also called as “green chemistry, " focus on the processes and products, which reduce the use of hazardous substances and nonrenewable sources. Membrane separation, absorption, and physical adsorption for gas separation, purification, and storage are considered to be energy-efficient, low-cost, renewable, and environmental-friendly for a sustainable future. In this section, we highlight the details of these green techniques in gas separation and storage applications. © 2021 Elsevier Ltd. All rights reserved.
Citation - Scopus: 2
Advanced Applications of Green Materials in Bioelectronics Applications
(Elsevier, 2020) Yılmaz, Tuğbahan; Kuş, Mahmut
Green materials have great potential to become a primary research area for bioelectronic integration. Over the last three decades, bioelectronic applications have been getting great interest due to their low cost, flexible, nontoxic, large-volume electronic components that are sustainable, biocompatible, biodegradable, and bioresorbable. Therefore the versatility of bioelectronics applications, such as organic field-effect transistors and biosensors, promises a bright future. This chapter will highlight recent progress in the natural materials and some of their applications in bioelectronics devices. The key strategies and the forecast perspectives of this research field are also briefly summarized. © 2021 Elsevier Ltd. All rights reserved.
Akıllı Kent Uygulamalarının Engelli ve Yaşlı Bireyler İçin Sunduğu Olanaklara İlişkin Bir Değerlendirme
(Eğitim, 2023) Meşhur, Havva Filiz; Fazla, Büşra
Altınapa Stromatolit ve Onkolitlerinin (konya) Oluşumu, Tipleri ve Jeoturizm Potansiyeli
(Gece Kitaplığı, 2020) Parlar, Şeyda; Eren, Yaşar
Applying a Morphological Approach To Istanbul’s Urban Landscape [book Part]
(Springer, 2022) Arat, Muzaffer Ali; Oliveira, Vitor
This paper proposes a methodology based on the concept of morphological region and the method of morphological regionalization. The concept has been proposed by M.R.G. Conzen in the early 1960s, and promoted by J.W.R. Whitehand and his colleagues at the University of Birmingham mainly from the late 1980s. A morphological region is an area that has unity in respect of its form that distinguishes it from surrounding areas, based on a combination of town-plan, building fabric, and land and building utilization (Conzen’s tripartite division of the urban landscape). The methodology is based on a set of criteria considering the tripartite division of the urban landscape. Age of streets, streets geometry, plot layout, and building coverage are four criteria offered on the basis of the town-plan. Architectural style, building material, and height are proposed on the basis of the building fabric. Finally, land and building utilization is used to design the methodology. The methodology is applied to the Fatih District, the historical core of Istanbul. A four-tier hierarchy of regions is identified. The map of first-order morphological regions can offer the basis to produce a map of planning zones—a key tool to guide urban landscape management. Lower order regions can support the formulation of regulations for each planning zone, framing the design of new forms, assuring a strong relationship with extant urban forms. These ideas, detailed in the paper, are of great relevance for spatial planning, particularly for Turkish planning, where regulations are very generic and do not acknowledge the specific character of each urban landscape.
Asbestos Exposure in Urban Renewal
(Duvar Yayınları, 2022) Özdemir, Sıtkı Alper; Çöğürcü, Mustafa Tolga; Arslan, Mehmet Akif
Autogenous Self-Healing Assessment of 1-Year Cementitious Composites
(Springer Science and Business Media B.V., 2021) Yildirim, Gurkan; Ulugol, Huseyin; Ozturk, Oguzhan; Sahmaran, Mustafa
Traditional concrete materials are prone to cracking and as cracks form, durability issues arise which reduce the expected service life of the materials followed by structures incorporating them. This, in many occasions, may lead to repetitive repair and maintenance or even re-construction of certain structural/non-structural sections and structures. Thus, it is highly desirable to reduce the chance and/or further development of cracking. Engineered Cementitious Composites (ECC) are feasible materials to suppress cracking formation and progression through their strain-hardening response under uniaxial tensile loading conditions. Even at the stage of failure, these materials exhibit micron-size cracks which significantly improve the capability to resist against detrimental durability issues. Moreover, these microcracks are constantly reported to be closed through autogenous healing mechanisms with no external interference from outside which significantly improve the mechanical and durability performance and service life of these materials and structures incorporating them. However, the performance of autogenous self-healing in ECC is called into question, especially for late-age specimens since reactions which produce products to plug the micro-size cracks stabilize as the specimens get more and more mature. To clarify this subject, in this study, 1-year-old specimens produced from ECC mixtures incorporated with different mineral admixtures (i.e. Class-F fly ash and ground granulated blast furnace slag) were tested for their self-healing performance. For self-healing evaluation, specimens which were severely preloaded for creating microcracks, were subjected to four different curing conditions which included "Water", "Air", "CO2-water" and "CO2-air" for 90 additional days beyond initial 1 year. Tests used for self-healing assessments were electrical impedance (EI) and rapid chloride permeability (RCP). Results indicate that water is a must-have component for enhanced autogenous self-healing efficiency. "CO2-Water" curing results in the most effective self-healing performance regardless of the composition of ECC mixtures. By properly adjusting mixture proportions and curing conditions, microcracks as large as nearly half a millimeter (458 mu m) can be healed in only 30 days of further curing. Overall, results clearly suggest that late-age autogenous self-healing capability of ECC can be made as effective as the early-age with proper further environmental conditioning and mixture design.
Citation - Scopus: 15
Chaos Theory in Metaheuristics
(Elsevier, 2023) Türkoğlu, B.; Uymaz, S.A.; Kaya, E.
Metaheuristic optimization is the technique of finding the most suitable solution among the possible solutions for a particular problem. We encounter many problems in the real world, such as timetabling, path planning, packing, traveling salesman, trajectory optimization, and engineering design problems. The two main problems faced by all metaheuristic algorithms are being stuck in local optima and early convergence. To overcome these problems and achieve better performance, chaos theory is included in the metaheuristic optimization. The chaotic maps are employed to balance the exploration and exploitation efficiently and improve the performance of algorithms in terms of both local optima avoidance and convergence speed. The literature shows that chaotic maps can significantly boost the performance of metaheuristic optimization algorithms. In this chapter, chaos theory and chaotic maps are briefly explained. The use of chaotic maps in metaheuristic is presented, and an enhanced version of GSA with chaotic maps is shown as an application. © 2023 Elsevier Inc. All rights reserved.
Citation - Scopus: 8
Characterization of Bionanocomposites
(Elsevier, 2021) Kırbıyık Kurukavak, Çisem; Yılmaz, Tuğbahan
Bionanocomposites have gained a great interest from researchers as they offer remarkable properties to be used in different fields, including biology, materials science, chemistry, and nanotechnology. However, it is well known that the specific application can only be determined if their structure is illuminated at the atomic level. This chapter describes a brief overview of some spectroscopic and morphologic characterization techniques to understand the morphology, microstructure, and intermolecular interactions of bionanocomposites. © 2021 Elsevier Ltd All rights reserved.
Coğrafi İşaretler ve Kırsal Kalkınma Bağlamında Turizm: Aydın Örneği
(Karabük Üniversitesi Yayınları, 2021) Aydın, Cansel; Gündüz, Elif
In the last fifty years, as socio-economic and technological developments have started to progress in the world, significant changes have started to occur in the perception of tourism. Rural tourism also draws attention as a type of tourism that has become widespread in the world. In the recent pandemic process, people's orientation towards rural areas has accelerated this trend. The desire to get away from busy and crowded places has made rural areas important points of attraction. Rural areas attract attention with their cultural and traditional values instead of sea, sand, sun tourism. This cultural and traditional lifestyle, which develops depending on the diversity of rural agricultural production, adds originality to many areas of life, from clothing to eating and drinking. Local product potentials support regional and rural development. Products with geographical indication registration have a great role in branding, strengthening the image of the region and strengthening regional tourism. In this context, the use of geographical indications in tourism is an important tool for rural development. The reputation and quality of the products registered with geographical indications arouses curiosity about their production methods and culture, and contributes to the revival of tourism by attracting consumers to the region. Thus, tourism in the regional / local area is supported and economic advantages are provided to the region. Rural development that has been correctly designed within a holistic planning approach; It is possible with the proper and correct use of tools such as tourism. Our country has an extremely wide range of local products. Aydın province is one of the provinces with high tourism potential, which has hosted many different civilizations and allows different tourism activities with its rural and coastal areas. However, it cannot provide the expected and sufficient return from tourism. In this study, the concepts related to rural areas, geographical indications and tourism were defined and their relationship with development was tried to be revealed from the perspective of planning. In this direction, a literature review was made by using various written sources such as thesis, article, book, etc. related to the subject and the field. Besides the literature review; It contributed to the study by conducting on-site detection studies for the rural area of Aydın province, oral interviews with the local people and interviews with the relevant public institutions.. Within the scope of the data obtained after the research, various suggestions and strategies have been developed regarding the use of geographical indications in rural development-oriented tourism planning.
Citation - Scopus: 11
Design and Synthesis of Metal Oxide-Polymer Composites
(Elsevier, 2022) Kaya Güzel, Gülcihan; Deveci, Hüseyin
Recently, metal oxide-polymer composites have received significant attention in many industrial fields. The combination of metal oxides (commonly used TiO2, ZnO, Fe3O4, and Al2O3) with a polymer matrix governs to produce high-performance metal oxide-polymer composites by in situ polymerization, sol-gel method, solution blending, or melt blending. Design of the metal oxide-polymer composites is essential to meet requirements for tailored productions of the composite materials. Many design parameters such as metal oxide characteristics and alignment, polymer matrix structure, amount of metal oxide/polymer matrix, surface modifications, and production conditions considerably affect interactions between a metal oxide and polymer matrix. Good compatibility of metal oxide with polymer matrix through homogeneous dispersion of the metal oxide in the matrix provides synergistic effects on the properties of the composites. The authors represented the design and synthesis of the metal oxide-polymer composites in detail in this chapter. Enhanced mechanical, electrical, optical, magnetic, thermal, barrier, and antibacterial properties of the metal oxide-polymer composites were briefly mentioned depending on design parameters. © 2022 Elsevier Inc. All rights reserved.
Citation - Scopus: 1
Determination of Autogenous Self-Healing Capability of Cementitious Composites Through Non-Destructive Testing
(Springer Science and Business Media B.V., 2021) Yıldırım, Gürkan; Öztürk, Oğuzhan; Ulugöl, H.; Hatem, M.; Şahmaran, Mustafa
Unlike conventional concrete and fiber reinforced concrete, Engineered Cementitious Composites (ECC) display closely spaced multiple microcracks through strain/deflection-hardening response when subjected to tension-based loadings. These multiple microcracks allow ECC to be characterized with inherent autogenous self-healing capability. With the emergence of cement-based composites exhibiting multiple tight cracking, possibility for favoring the intrinsic self-healing behavior increased. Self-healing phenomenon in cementitious composites is being studied extensively nowadays. Although, great number of tests utilized to evaluate the self-healing mechanism in cementitious composites, implementation can be time consuming in some occasions and results from different tests may not always well-suit. Thus, different from other studies in literature, direct electrical impedance (EI) measurements were used in the present study to evaluate the self-healing performance of ECC mixtures along with rapid chloride permeability test (RCPT) and resonant frequency (RF) measurements. Experimental results revealed that EI testing is rather easy to perform and takes very limited time but it seems that the method itself is markedly influenced by anything modifying ionic state of specimens. Therefore, it looks like a hard task to very accurately assess the self-healing performance of ECC specimens considering the fact that both ongoing hydration and calcium carbonate precipitation which are regarded to be the main mechanisms contributing to the autogenous self-healing significantly changes the specimens’ pore solution chemistry. Well-fitting exponential relationship exists between EI and RCPT measurements at different ages regardless of the mixture and specimen type. However, results from RF tests do not correlate either with EI or RCPT results which is attributed to the different parameters having paramount influence on the individual tests. Although results from different tests do not always correlate well among themselves, three different tests used for the present study are capable of monitoring the self-healing behavior with differing efficiencies. © 2021, The Author(s), under exclusive license to Springer Nature Switzerland AG.
Citation - WoS: 1
Citation - Scopus: 1
Determination of Autogenous Self-Healing Capability of Cementitious Composites Through Non-Destructive Testing
(Springer Science and Business Media B.V., 2021) Yildirim, Gurkan; Ozturk, Oguzhan; Ulugol, Huseyin; Hatem, Muhammed; Sahmaran, Mustafa
Unlike conventional concrete and fiber reinforced concrete, Engineered Cementitious Composites (ECC) display closely spaced multiple microcracks through strain/deflection-hardening response when subjected to tension-based loadings. These multiple microcracks allow ECC to be characterized with inherent autogenous self-healing capability. With the emergence of cement-based composites exhibiting multiple tight cracking, possibility for favoring the intrinsic self-healing behavior increased. Self-healing phenomenon in cementitious composites is being studied extensively nowadays. Although, great number of tests utilized to evaluate the self-healing mechanism in cementitious composites, implementation can be time consuming in some occasions and results from different tests may not always well-suit. Thus, different from other studies in literature, direct electrical impedance (EI) measurements were used in the present study to evaluate the self-healing performance of ECC mixtures along with rapid chloride permeability test (RCPT) and resonant frequency (RF) measurements. Experimental results revealed that EI testing is rather easy to perform and takes very limited time but it seems that the method itself is markedly influenced by anything modifying ionic state of specimens. Therefore, it looks like a hard task to very accurately assess the self-healing performance of ECC specimens considering the fact that both ongoing hydration and calcium carbonate precipitation which are regarded to be the main mechanisms contributing to the autogenous self-healing significantly changes the specimens' pore solution chemistry. Well-fitting exponential relationship exists between EI and RCPT measurements at different ages regardless of the mixture and specimen type. However, results from RF tests do not correlate either with EI or RCPT results which is attributed to the different parameters having paramount influence on the individual tests. Although results from different tests do not always correlate well among themselves, three different tests used for the present study are capable of monitoring the self-healing behavior with differing efficiencies.
Development of Empirical Equations To Predict the Strength Properties of Rocks With Non-Destructive Test Techniques
(Bidge Yayınları, 2023) Balcı, Mehmet Can; İnce, İsmail; Bozdağ, Ali
Dirençli Kentler Kapsamında Multidisiplinlerin Rolü: Osmaniye Örneği
(Platanus Publishing, 2023) Oral, Murat
Dünya’da ve Türkiye’de Obruk Oluşumları; Tanım, Sınıflandırma ve Oluşum Koşulları
(Orient Yayınları, 2023) Arık, Fetullah
Effect of Binary-Use Mineral Admixtures for the Advanced Autogenous Self-Healing Behavior of Fiber-Reinforced Cementitious Composites
(Springer Science and Business Media B.V., 2021) Öztürk, Oğuzhan; Roig-Flores, M.
This paper comprises the enhanced self-healing properties of fiber-reinforced cementitious composites by taking advantage of synergistic effect of using different mineral admixtures. To do this, single and binary use of metakaolin (MK) and zeolite (Z) were utilized in cement-based mixtures, and early age self-healing behavior of specimens was assessed based on sorptivity tests. The autogenous self-healing performance of each mixture was also evaluated via crack width assessments by using a video microscope. Results were compared with the sound and preloaded specimens having different crack width levels. In addition, mechanical properties of four different mixtures were evaluated by conducting experiments on 7 and 28 days. The multiple crack width closures and sorptivity coefficients of preloaded specimens indicated that an effective combination of MK and Z can trigger a higher level of self-healing in comparison with reference mixture. However, single-use of Z in mixtures was also promising for achieving autogenous self-healing attributes compared to mixtures containing only MK and to reference mixtures. Having said that, this behavior should also be addressed for different pre-cracking and prolonged curing age of each mixture. © 2021, RILEM.
Expectations From Cultural Heritage and Tourism Kilistra Case
(Çizgi Kitapevi Yayınları, 2018) Gündüz, Elif
Fire Resistant Material Recommendation for Sidings of Educational Buildings
(Duvar Yayınları, 2022) Özdemir, Sıtkı Alper; Çöğürcü, Mustafa Tolga; Arslan, Mehmet Akif

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Browsing 05. Fakülteler by Publication Category "Kitap Bölümü - Uluslararası"