Yazarlar
- Peker, Iskender(23)
- Araz, Onur(16)
- Erol, Ismail(15)
- Ar, Ilker Murat(12)
- Bayraktar, Alemdar(10)
- Seferoğlu, Mehmet Tevfik(10)
- Aydin, Metin Mutlu(9)
- Günaydin, Murat(9)
- Adanur, Süleyman(8)
- Altunişik, Ahmet Can(8)
- Basoglu, Mustafa Engin(8)
- Akyol, Mehmet(7)
- Yanarateş, Cağfer(7)
- Akpinar, Muhammet Vefa(6)
- Altan, Aytaç(6)
- Barut, Abdulkadir(6)
- Başoğlu, Mustafa Engin(6)
- Cakmak, Recep(6)
- Searcy, Cory(6)
- Çavdar, Özlem(6)
- Baki, Birdogan(5)
- Benli, Tolga(5)
- Gergin, Ramazan Eyüp(5)
- Kahya, Volkan(5)
- Kuzulugil, Kenan(5)
- Ozden, Talat(5)
- Pala, Fahrettin(5)
- Seferoğlu, Ayşegül Güneş(5)
- Sevim, Bariş(5)
- Yilmaz, Tekin(5)
- Adanur, S.(4)
- Adanur, Suleyman(4)
- Aksüt, Yavuz Selim(4)
- Altunisik, Ahmet Can(4)
- Aydin, Musa(4)
- Cakir, Mehmet Ali(4)
- Cavusoglu, Ibrahim(4)
- Coruh, Emine(4)
- Ercikdi, Bayram(4)
- Gunaydin, M.(4)
Yayınlar
- MakaleYalnız künye2024The Elephant in the Room: New Skills and Work Dimensions of Turkish White Goods Industry Engineers in Industry 4.0 Era
Demirbag, Kubra Simsek; Yildirim, Nihan
While the emergence of the Industry 4.0 (I4.0) concept has heightened concerns about how digital transformation will affect employees, engineers who create, develop, and spread the I4.0 tools and technologies are ignored. Also, the industries with the highest digital maturity should be prioritized since they are the readiest ones for the I4.0 transformation. In this context, our focus is the engineers in the Turkish white goods industry, one of the three industries with the highest level of digital maturity in Turkey. We aim to determine the new skills expected from engineers and to uncover the impact of the perceived usage level of I4.0 technologies by engineers on the dimensions of engineering work. In this article, we conducted two separate surveys for engineers and managers and sought answers to four research questions using factor analysis and regression analysis. The results show that the new skills are divided into intrinsic motivation, technology, and data and information skills. At the same time, the perceived usage level of I4.0 technologies influences the social characteristics dimension of engineering work. We revealed that the sociability level of the engineers who use data analytics, artificial intelligence, simulation, and RFID/RTLS technologies while performing their jobs tends to decrease, while the sociability level of the engineers who use adaptive robots and additive manufacturing technologies gets higher.
- MakaleAçık Erişim2024Design and fabrication of low-cost microsystems for production of chitosan particles; [Kitosan parçacıklarının üretimi için düşük maliyetli mikrosistemlerin tasarımı ve fabrikasyonu]
Akay, Seref; Özdilek, Hasret
Recent research has focused on the methods for administration of medications in a controlled manner while minimizing side effects. Cross-linked hydrogels have wide application area as nanocarriers. There are many approaches for developing suitable methods to produce ideal particles. Advances in microtechnology have been considered as a solution to produce controlled drug delivery systems, however, it is limited due to the necessity for specialized laboratories. In this study, a simple method to produce antibiotic-loaded chitosan particles is proposed. Production was carried out with two different designs, a syringe-based flow focusing system (outer diameter of 1 mm, inner diameter of 120 µm) and microchannel with 250 µm width and 100 µm height fabricated with the computer numerical control (CNC). Sodium Triphosphate (TPP) was used as cross-linking agent for the production of particles and the effects of the concentration and flow rates on the particle formation was investigated. It has been observed that particles can be produced in a syringe-based system, but the resulting particles are not homogeneous. In the studies carried out with CNC microchannel, it was determined by SEM analysis that the obtained particles ranged in size from 39 to 771 nm, and it was seen that the CNC microchannel was more effective at low and equal flow rates (25 µl/min). It has been found that increasing the flow rate and concentration of chitosan increases the particle size. It was determined that Ampicillin loaded particles synthesized with the CNC microchannel exhibited high inhibition against Gram positive and Gram negative bacteria. These results show that the proposed approaches for the design of microsystems can be used in the formation of drug carriers without the need for specialized laboratories and expertise.
- MakaleAçık Erişim2024GIS-based multi-influencing factor (MIF) application for optimal site selection of solar photovoltaic power plant in Nashik, India
Rane, Nitin Liladhar; Günen, Mehmet Akif; Mallick, Suraj Kumar; Rane, Jayesh; Pande, Chaitanya B.; Giduturi, Monica; Bhutto, Javed Khan; Yadav, Krishna Kumar; Tolche, Abebe Debele; Alreshidi, Maha Awjan
The significant natural energy sources for reducing the global usage of fossil fuels are renewable energy (RE) sources. Solar energy is a crucial and reliable RE source. Site selection for solar photovoltaic (PV) farms is a crucial issue in terms of spatial planning and RE policies. This study adopts a Geographic Information System (GIS)-based Multi-Influencing Factor (MIF) technique to enhance the precision of identifying and delineating optimal locations for solar PV farms. The choice of GIS and MIF is motivated by their ability to integrate diverse influencing factors, facilitating a holistic analysis of spatial data. The selected influencing factors include solar radiation, wind speed, Land Surface Temperature (LST), relative humidity, vegetation, elevation, land use, Euclidean distance from roads, and aspect. The optimal sites of solar PV power plant delineated revealed that 'very low' suitability of site covering 4.866% of the study area, 'low' suitability of site 13.190%, 'moderate' suitability of site 31.640%, 'good' suitability of site 32.347%, and 'very good' suitability of site for solar PV power plant encompassing 17.957% of the study area. The sensitivity analysis results show that the solar radiation, relative humidity, and elevation are the most effective on the accuracy of the prediction. The validation of the results shows the accuracy of solar PV power plant prediction using MIF technique in the study area was 81.80%. The integration of GIS and MIF not only enhances the accuracy of site suitability assessment but also provides a practical implementation strategy. This research offers valuable insights for renewable energy policymakers, urban planners, and other stakeholders seeking to identify and develop optimal locations for solar energy power farms in their respective regions.
- MakaleAçık Erişim2024Supply chain resilience in the tourism and hospitality industry: A comprehensive examination of driving and restraining forces
Erol, Ismail; Oztel, Ahmet; Dogru, Tarik; Peker, Iskender; Neuhofer, Irem Onder; Benli, Tolga
Supply chain disruptions and a lack of resilient supply chains have adverse impact on the global economy. Particularly, complex nature of the tourism and hospitality industry makes it even more susceptible to failure when supply chain resiliency is rather low or does not exist. However, despite its significance, a comprehensive and systematic examination of building resilience in tourism and hospitality supply chains (THSCs) is lacking in the extant literature. The purpose of this study is to develop a comprehensive framework that outlines the driving and restraining forces for building resilient THSCs. The decision framework proposed in this study integrates rough interval valued neutrosophic (RIVN) force field theory of change with RIVN-ISM-MICMAC methodology. The results showed that the restraining forces, such as lack of effective regulations and incentives and effective organizational and supply chain policies are the primary factors that constrain improving resilience in THSCs. Theoretical and practical implications are discussed.
- MakaleAçık Erişim2024Does structural change matter for sustainable development in newly industrialized countries? Fresh evidence from a new sustainability indicator
Artan, Seyfettin; Erdogan, Sinan; Recepoglu, Muersit; Çakir, Suemeyra cay; Hayaloglu, Pinar; Çakir, Mehmet Ali
The economic gap between developed and developing economies has been diminishing due to the recent rapid economic growth performance of developing economies. While achieving this swift growth level, developing economies have structurally transformed their economies. However, the impact of this structural change on environmental sustainability remains unclear. Therefore, this study focuses on the impacts of structural change, energy structure, and economic growth on the load capacity factor, a comprehensive sustainability indicator, in newly industrialized countries during 2000-2020. To this end, second-generation panel data techniques, which account for cross-sectional dependence and heterogeneity, are used to provide more robust and reliable estimates. The results show that economic growth, structural change, and fossil energy utilization decrease the load capacity factor while renewable energy utilization increases it. These findings underscore the need for energy efficiency and resource-conscious policies that align with environmental sustainability while promoting economic growth, highlighting their crucial role in the future of sustainable development.
- MakaleAçık Erişim2023Geri dönüşüm işletmelerinin inşaat ve yıkım atıkları açısından performanslarının bütünleştirilmiş SWARA-EDAS yöntemiyle değerlendirilmesi: Türkiye örneği
Gergin, Ramazan Eyüp
Günümüzde, inşaat ve yıkım atıklarının artan miktarı nedeniyle ülke ekonomileri birçok zorlukla karşı karşıya gelmektedir. Döngüsel ekonomilerde inşaat ve yıkım atıklarının geri dönüşüm faaliyetlerinin daha önemli rol oynaması beklenmektedir. Buna paralel olarak inşaat ve yıkım atıklarının geri dönüşümü ülkelerin rekabet gücünü doğrudan etkilemektedir. Bu çalışma inşaat ve yıkım atıklarının geri dönüşüm faaliyetlerini gerçekleştiren işletmelerin performanslarını değerlendirmeyi amaçlamaktadır. İşletmelerin performanslarını değerlendirmek için kullanılan kriterler detaylı bir literatür taraması yapılarak belirlenmiştir. Çalışmanın alternatiflerini ise inşaat ve yıkım atıklarının geri dönüşüm faaliyetlerini gerçekleştiren işletmeler oluşturmaktadır. Belirlenen kriterlerin ağırlıklandırılmasında Step-Wise Weight Assesment Ratio Analysis (SWARA) kullanılmıştır. Kriter ağırlıklarının belirlenmesinin ardından inşaat ve yıkım atıklarının geri dönüşüm faaliyetlerini gerçekleştiren işletmelerin performansı Evaluation Based on Distance from Average Solution (EDAS) ile değerlendirilmiştir. Çalışmanın sonuçlarına dayalı olarak, inşaat ve yıkım atıklarının geri dönüşümünde en önemli kriter Sürdürülebilirlik olarak belirlenmiştir. Ayrıca çalışma çevresel etkiler ile inşaat ve yıkım atıklarının taşınması kriterlerinin sırasıyla diğer önemli kriterler olduğunu göstermektedir. EDAS yönteminin sonucu ise Alternatif 5 işletmesinin inşaat ve yıkım atıklarının geri dönüştürülmesi açısından en iyi performansa sahip olduğunu göstermektedir.
- MakaleAçık Erişim2023Digitalization and economic growth: new evidence from EU countries
Akyol, Hikmet; Akar, Tuba; Akar, Gökhan
Today's world is on the verge of a digital transformation with the developments in information and communication technologies. The digitalization process experienced affects societies both economically and socially. Recently, digitalization has become more important in terms of economic growth and competitiveness of countries. The aim of this study is to examine the effect of digitalization on economic growth for the period 2000-2020 in 27 EU countries by using panel data analysis method. In the study, the econometric relationship between the variables was estimated using the Driscoll-Kraay (1998) standard errors estimator. In the study, exports of information and communication technology products, the number of individuals using the internet and the number of mobile phone subscribers were used as the independent variables representing the digitalization indicators. Real GDP per capita is taken to represent economic growth, which is the dependent variable. According to the findings of the research, it has been determined that digitalization indicators have a significant and positive effect on economic growth. The findings of the study support the theoretical and empirical literature that argues that digitalization will have a positive effect on economic growth. It is thought that investments to be made in digitalization and ICT infrastructure will provide significant gains.
- MakaleAçık Erişim2023Maden sektörü iş sağlığı ve güvenliği mevzuatının karşılaştırmalı olarak incelenmesi ve değerlendirilmesi
Kahraman, M Mustafa; Güngör, Aydanur
Çalışma koşullarının ağır, iş kazalarının fazla olduğu aynı zamanda da beden gücünün fazlasıyla kullanıldığı maden ocaklarında 18. yüzyılda sanayi devrimiyle beraber makineleşme artmıştır. Artan dünya nüfusu ve sanayileşme sebebiyle maden ve metallere olan talepler artmış ve ilk etapta üzerinde çok durulmayan iş sağlığı ve güvenliği konusu sanayinin geliştiği ülkelerde maddi kayıpların artışına neden olmuştur. Birçok insanın maden kazalarında öldüğü büyük felaketler sonrasında daha fazla gündeme gelmiştir. Yaşanan bu sorunlar üretimin ve verimin düşmesini de getirmiştir. Verimliliği arttırmak amacıyla iş güvenliğiyle ilgili kanunların çıkması ve iyileştirilmelerin yapılması gündeme alınmıştır. Türkiye’ye baktığımızda ise yakın geçmişte iş sağlığı ve güvenliği konusunda Avrupa Birliğine uyum amacıyla 2012 yılında kabul edilen ve yürürlüğe giren 6331 sayılı kanun iş güvenliği konusunda en kapsamlı çalışmadır. Ancak bu değişiklikler beklendiği gibi iş kazalarında istenen azalmayı sağlamamıştır. Bu çalışmada, madencilik faaliyetlerini güvenli ve verimli şekilde yapan ülkelerden bazıları olan; Amerika Birleşik Devletleri’nin ve Avustralya’nın madencilik sektöründeki yasal mevzuatlar ve maden iş kazalarına ilişkin istatistiksel bilgiler incelenmiştir. Bu ülkelere ait olan madencilikle alakalı mevzuat ve istatistikler Türkiye’nin bu alandaki yasal mevzuatları ve istatistikleriyle karşılaştırılmış ve değerlendirilmiştir. Son olarak ise yasal mevzuatın madencilikte iş güvenliğine olan etkisi tartışılmış ve öneriler sunulmuştur.
- MakaleAçık Erişim2023Prekast öngerme kirişli köprünün yapım aşamaları dikkate alınarak zaman tanım alanında doğrusal olmayan analiz yöntemiyle performansının belirlenmesi
Çavdar, Özlem; Sunca, Gülfem Çisem Köse
Mühendislik yapılarının tasarımında gerekli olan yapısal çözümlemelerin gerçekçi sonuçlar verebilmesi için tasarım aşamasında yapının inşa aşaması, süresi ve yapıya esas beton, çelik gibi malzemelerin bu süre zarfında meydana gelecek değişimleri ile beraber dinamik etkilerin de dikkate alınması gerekmektedir. Çalışma kapsamında karayolu köprüsünün uygulama modeli üzerinde gerçekleştirilecek sonlu eleman analizleriyle yapı tasarımlarının sadece servis durumu ve yapım aşamalarını dikkate alacak şekilde değil, zaman tanım alanında gerçek ivme kayıtlarının da kullanılarak dinamik çözümlenmesi gerekliliği amaçlanmıştır. Model olarak seçilen Çirmiş Köprüsü üç eşit açıklığa sahip olup toplam 96 metre uzunluğundadır. Köprü üst yapısı, tabliye ve öngerme kirişlerden oluşmaktadır. Bu tip köprülerin tasarım esaslarında kullanılan AASHTO, TS 3233 Yönetmelikleri ve TCK Yol Köprüleri Teknik Şartnamesi dikkate alınarak köprü üst yapısının model güvenilirliği sağlanılıp çözümlemelere başlanılmıştır. Dinamik etkilerin tespiti amacıyla TBDY-2018 kapsamında belirtilen kurallar çerçevesinde gerçekleştirilen zaman tanım alanında doğrusal olmayan yapım aşamalı analiz ile doğrusal olmayan yapım aşamalı analiz sonuçları karşılaştırılmıştır. Zaman tanım alanında doğrusal olmayan yapım aşamalı analiz sonuçlarının yapı elemanlarında daha yüksek kesit tesirleri ve yer değiştirme değerleri verdiği gözlemlenmiştir. Ülkemizin aktif fay kuşağında yer almasından dolayı yapı tasarımlarının, zaman tanım alanında gerçek ivme kayıtlarının da kullanılarak dinamik çözümlenmesi gerekmektedir.
- MakaleAçık Erişim2023AB’de Döngüsel Ekonomi Üretim ve Tüketim Göstergelerinin Değerlendirilmesi: MEREC Temelli MARCOS Uygulaması
Seyhan, Nazlı
Bu çalışmada, MEREC (Method based on the removel effects of criteria) temelli MARCOS (Measurement of alternatives and ranking according to compromise solution) yöntemi kullanılarak 2020 yılı için AB üyesi 27 ülkenin döngüsel ekonomideki üretim ve tüketim performansları değerlendirilmiştir. Çalışmada; malzeme ayak izi, kaynak üretkenliği, tüketim ayak izi, malzeme ithalat bağımlılığı, geri dönüştürülebilir hammadde ticareti, üretim faaliyetlerinden kaynaklanan sera gazı emisyonu gibi birçok üretim ve tüketim göstergeleri ele alınmıştır. MEREC yöntemiyle elde edilen bulgularda en önemli kriterin geri dönüştürülebilir hammadde ticareti olduğu ve bu kriteri sırasıyla döngüsel ekonomi sektörleriyle ilgili özel yatırım ve brüt katma değer ve döngüsel malzeme kullanım oranı kriterlerinin takip ettiği görülmektedir. MEREC yöntemiyle belirlenen kriter ağırlıklarının kullanıldığı MARCOS yöntemi uygulaması sonuçlarına göre, döngüsel ekonomide üretim ve tüketim göstergelerine göre performansı yüksek olan ülkelerin sırası ile Hollanda, Almanya, Fransa ve İspanya; performansı düşük olan ülkelerin ise, Lüksemburg, Finlandiya, Malta, Kıbrıs ve Estonya olduğu görülmüştür. Elde edilen bulgularda döngüsel ekonomiye geçişte bazı ülkelerin çok hızlı dönüşüm gerçekleştirirken bazı ülkelerde bu geçişin daha yavaş olduğu tespit edilmiştir. Ülkelerin alabileceği bazı tedbirler (geri kazanımı olmayan atıklarda yüksek vergilendirme vb., değişim sürecinde olan işletmelere net süre belirtilmesi) ve desteklerle (özellikle sera gazı emisyonu için yenilikçi iş modelleri, geri kazanım projeleri vb.) geçiş sürecinin daha kontrollü yapılabilmesi mümkün olabilir.
- MakaleAçık Erişim2023Spatial analysis of high-tech exports with geographically weighted regression
Kalkan, Yusuf
The development of High-Technology Exports (HTE) contributes to the increase of competitiveness and growth in national production, the development of commercial and economic cooperation with foreign countries, and the diversification of the economy. In addition, high technology exports reduce the current account deficit of the country's economy. Therefore, high-tech industries have become indispensable for economic development in a country. The aim of this study is to examine the existence of spatial (neighbourhood) relations of countries in high-technology exports. In this study, Exploratory Regression analysis was applied to determine the model that best explains HTE among the variables. Moran Index was used for spatial autocorrelation, Geographical Weighted Regression (GWR) method for spatial regression analysis, and Ordinary Least Squares (OLS) method, to compare with the GWR method. The GWR model established in this study showed that countries have a weak or strong spatial relationship with their neighboring countries in terms of HTE. It has been observed that this spatial relationship is strong in the countries neighboring China, which ranks first in HTE, while the spatial relationship is weak in countries where HTE is low.
- MakaleAçık Erişim2023Eksenel Yüke Maruz Çelik Boru ve Kutu T-birleşimlerinin Yangın sonrası Davranışı
Ozyurt, Emre
Bu çalışma, boru ve kutu profillerden oluşmuş kafes sistem T-birleşimlerinin eksenel yük altında yangın sonrası davranışlarını sonlu elemanlar yöntemi kullanarak incelemeyi amaçlamaktadır. Bunu için farklı geometrik özelliklere sahip T-birleşimler sonlu elemanlar programı kullanılarak modellenildi. Öncelikle ısı transfer analizi yapılarak, oluşturulan sayısal modeller ISO 834 yangın eğrisine bağlı olarak ısıtıldı ve sonra soğutuldu. Yangın sonrası artık gerilmelere ve deformasyonlara maruz kalmış birleşimlere, maksimum dayanıma ulaşıncaya kadar örgü elemanı ucundan eksenel yük uygulanıldı. Tüm birleşimlerde göçme sınır durumu başlık elemanı cidarında plastikleşme olarak tespit edildi. Yangın öncesi ve sonrası birleşimlerin dayanımları karşılaştırıldı. Sayısal sonuçlardan elde edilinen bilgilere göre yangın sonrası tübüler T-birleşimlerin dayanımları %23,5 ’a kadar düşmektedir. Ayrıca, birleşimler üzerindeki sıcaklık dağılımları, örgü-başlık eleman oranlarına ve başlık elemanının et kalınlıklarına bağlı olarak değişmektedir. Yangın sonrasında oluşan artık gerilme ve deformasyonlar boru ve kutu T-birleşimlerin dayanımlarına önemli derecede etki etmektedir.
- MakaleAçık Erişim2023Türkiye Otomotiv Sanayiinin Yenilikçilik Potansiyeli: Uluslararası Yatırımlar, Coğrafi Kümelenme ve Alıcı-Tedarikçi İlişkileri Açılarından Bir Değerlendirme
Şahin, Fatih
Bu çalışmanın amacı Türk otomotiv sanayiinin yenilikçilik potansiyelini etkilediği düşünülen uluslararası yatırım faaliyetleri, coğrafi kümelenmesi ve Ar-Ge ve yenilikçilik faaliyetleri ilgili temel normları bakımından incelenerek araştırmacılara bilgi sunmaktır. Çalışma kapsamında yapılan değerlendirmeler araştırmacının yürüttüğü geniş ölçekli saha çalışmalarının ürünü olarak ortaya çıkan gözlemlerine ve ikincil veri kaynaklarına dayanmaktadır. Bu değerlendirmeler neticesinde, tarihsel olarak geç sanayileşmenin izlerini taşıyan sektörün gelişiminin, Türk İş Sisteminin gelişimi ile paralel özellikler gösterdiği ve Türk otomotiv Sanayiinin tarihsel gelişiminde yabancı sermayeli örgütlerin mutlak bir rolünün olduğu ortaya konulmuştur. Bununla birlikte yenilikçiliğin sacayaklarından birisini oluşturan ihracat ve dışa doğru doğrudan yabancı sermaye yatırımı faaliyetleri de sektörde etkin bir şekilde yürütüldüğü görülmektedir. Sektörün kendine özgü dinamikleri içerisinde şekillenen hiyerarşik tedarik zinciri yapılanması ise yenilikçilik potansiyeli açısından dikkate değer bir inceleme alanı oluşturduğu değerlendirilmektedir. Son olarak yenilikçiliğin örgütler arasında yayılarak kurumsallaşması açısından sektörün coğrafi olarak kümelenme özelliği göstermesi de önemli bir teşvik edici unsur oluşturmaktadır.
- MakaleAçık Erişim2023Determining the most suitable sectors in terms of the digital supply chain by integrated fuzzy MCDM approach
Gergin, Ramazan Eyuep
In this day and age, businesses come up against several challenges due to digital progresses in their supply chain. Digitalization has been expected to play an increasingly important role for both companies and the supply chains of the future. Concordantly, it is important to determine the suitability of the supply chains of the sectors for digitalization in order to cope with the difficulties that the enterprises will face in the future. The main objective of this study is to determine the suitability of the supply chains of the sectors in which medium-sized enterprises operate for digitalization. For this purpose, the criteria which affecting the constitution of the digital supply chain are determined with a comprehensive literature search. Fuzzy Analytical Hierarchy Process (FAHP) is utilized to weighting of the relevant criteria. Sectors which medium-sized enterprises are constitute the alternatives of the study. After the weighting of the criteria, in terms of digital supply chain the suitability of the sectors was evaluated via Fuzzy TOPSIS (FTOPSIS) and Fuzzy VIKOR (FVIKOR). BORDA count technique is utilized to obtain the final decision by integrating the results from these two methods. According to the results of the study, the most important criterion in terms of Global Connectivity digital supply chain was determined as the Manufacturing sector according to FTOPSIS and the Health sector has been determined as the most suitable sector for digitalization according to FVIKOR. As to BORDA Count method, results show that the manufacturing sector is the most suitable sector for digitalization in the general ranking.
- MakaleAçık Erişim2023Technological Convergence in Emerging Economies: An Investigation with Unit Root Tests
Zuhal, Mustafa
Technological developments play an important role in economic growth and development and form the basis in the convergence of socioeconomic factors between developed and developing countries, especially income. At the same time, developing countries aim to catch up with the leading countries by improving their technological capabilities, and examining the technological convergence between countries, especially developing countries, is essential at this stage. This study aims to examine whether technological convergence occurs in 10 emerging economies. For this purpose, the study analyzes technological convergence over the variables of number of patents, labor productivity, and total factor productivity using Pesaran's (2007) cross-sectionally augmented Dickey-Fuller (CADF) and seemingly unrelated regression augmented Dickey-Fuller (SURADF) unit root tests. According to the results of the analysis, although there is convergence in some countries, it does not confirm in general technological convergence among the countries.
- MakaleAçık Erişim2023Oilseed warehouse location selection with an integrated approach: a case of Turkey
Gergin, Ramazan Eyup; Peker, Iskender; Baki, Birdogan; Tuzkaya, Umut Rifat; Tanyas, Mehmet
Purpose Agricultural sector not only meets the nutritional requirements of all living creatures but also generates the primary source of the raw material provided by various branches of industry to fulfill their functions. It is of great importance to increase studies on oilseeds which have an important role in Turkey's agricultural products. They are grown in almost all of the country, which are vital for the nutrition and many sectors. The main purpose of the study is to offer an integrated approach to determine potential warehouse locations for oilseeds. Design/methodology/approach This is the first study that integrates Delphi, analytical hierarchical process (AHP), technique for order preference by similarity to ideal solution (TOPSIS), P-Median and Panel data analysis in a real case. This integrated approach consists of the following steps, respectively: (1) The criteria were determined by the Delphi method. (2) The weights of the criteria were calculated by AHP and the provinces with the highest oilseed warehouse potential in seven regions of Turkey were specified by TOPSIS. (3) Oilseed warehouse numbers and locations were obtained by P-Median. (4) In order to answer whether the distribution network is profitable in the future with the determined center locations, a forecast model based on panel data analysis was created. (5) Regional representatives were determined for 2030, and the distribution network was analyzed again. (6) The costs that arose in 2018 and 2030 were computed and compared by cost analysis. (7) The effect of the change in criteria weights on the alternative results was tested by scenario analysis. Findings The findings indicated that oilseed crop production potential and oilseed crop production area turned out to be the most important criteria. Furthermore, the results showed that this model is robust and suitable for warehouse location selection studies. Practical implications The study can serve as a guide for local and central policy makers with both the criteria it uses and the model it develops. Originality/value The main contribution of this study is that the integrated approach has been used for the first time in location selection in a real case.
- MakaleAçık Erişim2023Getting the measure of the fourth industrial revolution: advantages and challenges of Industry 4.0 in the Turkish white goods industry
Şimşek Demirbağ, Kübra; Yıldırım, Nihan
Purpose: Industry 4.0 (I40) is an open window of opportunity for Turkey, a developed country, to eliminate technological dependence and produce with maximum productivity. However, I40, which corresponds to the fourth wave of industrial revolutions, brings both opportunities and challenges. In this context, this study aims to reveal the foresight of managers in the Turkish white goods industry (TWGI) regarding the advantages and challenges of I40 and compare them with the literature. Design/methodology/approach: The Delphi method was used for the study. Data were collected from managers of companies that are members of the White Goods Suppliers Association (BEYSAD). Seventy managers from 55 companies participated in the first round, and 19 managers participated in the second round of Delphi. Findings: The results show that the most frequently cited advantages are productivity/resource efficiency, data and information-enabled effectiveness/productivity, quality 4.0 and competitiveness/strategy. The most frequently mentioned challenges are financial resources/investment, employee qualification/training, technical/processual challenges and organizational transformation/leadership. Research limitations/implications: The sample was limited to the managers of the TWGI. Practical implications: Players in similar ecosystems and policymakers should consider the advantages and respond to potential challenges when creating roadmaps, taking the necessary steps and positioning themselves in the marketplace. In particular, the TWGI – Turkey’s showcase in international markets – should consider the undeniable benefits of the I40 transition to increase innovation. Originality/value: The findings for the first time highlight the advantages and challenges of I40 in an industry in Turkey, and they will benefit the TWGI, which is among the leaders in Turkey in terms of digital maturity and innovation in its journey to I40.
- MakaleAçık Erişim2023A decIsIon-makIng approach for open InnovatIon model selectIon In the TurkIsh automotIve Industry
DemIr, Ayse; Peker, Iskender; Gök, A. Cansu
The concept of open InnovatIon (OI) has become crucIal In the sustaInable competItIveness of IndustrIes. The selectIon and applIcatIon of approprIate OI models for busInesses also compose an Important research questIon. ThIs study aIms to decIde the most suItable OI model In the TurkIsh automotIve Industry through a three-step multI-crIterIa decIsIon-makIng (MCDM) model. FIrstly, the crIterIa that may affect the evaluatIon of the OI models are stated and weIghted by analytIc hIerarchy process (AHP). Afterward, VlseKrIterIjumska OptImIzacIja I KompromIsno Resenje (VIKOR) Is used to rank the OI models that can be Implemented In the automotIve Industry. In the last phase, the Impacts of dIfferentIatIon In crIterIa weIghts are tested wIth one-dImensIonal sensItIvIty analysIs. AccordIng to the results, the coupled open InnovatIon model Is ranked as the best alternatIve and the dIfferentIatIon In crIterIon weIghts does not affect thIs rankIng. ThIs study Is the fIrst attempt that attaIns the most suItable OI model In the automotIve Industry by a hybrId MCDM approach.
- MakaleYalnız künye2023A Proposed V2V Path Loss Model: Log-Ray
Kuzulugil, Kenan; Tugcu, Zeynep Hasirci; Cavdar, Ismail Hakki
Vehicle-to-vehicle (V2V) communication that has prominent involvement in the design of innovative communication solutions for the intelligent transportation system. Therefore, to develop V2V channel models, the knowledge of the propagation channel on which comprehensive research efforts have been carried is vital. In this study, we focused on the analysis and modeling of path loss characteristics for V2V communications and proposed a log-ray path loss model with the motivation of overcoming remarkable fitting errors between the two-ray model and measured data where the path loss exponent corresponds to different from 2. First, channel measurements were performed at 5.9 GHz with commercially available DSRC OBU devices for five different scenarios in typical highway and suburban environments in Gümüşhane, Turkey. Then, the large-scale characteristics of different propagation scenarios were analyzed and the proposed log-ray model performance was compared with commonly used log-distance and two-ray path loss models qualitatively and quantitatively. On the other hand, analysis of small-scale modeling and shadowing were also conducted for all scenarios and presented in the results. The findings clearly demonstrate that the proposed log-ray path loss model fits the measured data with a smaller RMSE value (2.54 dB) than the results of the log-distance (3.07 dB) and two-ray (3.72 dB) path loss models in the literature. In other words, the proposed model has approximately 17.5% and 32% increase in fitting performance according to the log-distance and the two-ray path loss models, respectively. The study results will be helpful for better performance analysis and system design of V2V communication.
- BildiriYalnız künye2023Current Sources and Actual PV Modules based Photovoltaic (PV) Emulator for Testing MPPT Algorithms and PV Inverters
Zhou, Zhongfu; Wang, Yidong; Yanarates, Cagfer; MacAulay, John
PV array emulator has been widely used for testing PV inverters and their control algorithms such as maximum power point tracking (MPPT) algorithms. Various power electronics converter-based PV emulators have been presented in many research papers. This paper presents a PV emulator that is based on indoor solar panels (without solar irradiance) and external current source (dc power supply). The external current source is used to emulate the photo current that is usually generated by solar panel under sunlight. The advantages of the proposed PV emulator are that it can generate similar electrical characteristics of actual PV panel without sunlight, it is suitable for testing PV inverters and MPPT algorithms in indoor conditions where the sunlight is usually very weak. In addition, a PV array emulator that can emulate electrical performance under partial shading conditions was constructed by using two solar panels and two current sources. Test results show that the proposed PV emulator provides a similar performance of real PV array under real sun light. It provides a low-cost solution for testing PV inverters and control algorithms inside a laboratory environment.
