Araştırma Çıktıları / Research Outputs

Permanent URI for this communityhttps://hdl.handle.net/20.500.14517/9

Browse

Now showing 1 - 20 of 349

ABD Askeri Sağlık Sistemi Reformunun İncelenmesi ve Uluslararası Güvenlik Çerçevesinde Türkiye Açısından Değerlendirilmesi
(2025) Özmen, Oğuzhan; Özkut, Uğur Tarık; Özmen, Pelin
Bu çalışmanın amacı; ABD askeri sağlık sistemindeki (ABD-ASS) reform ihtiyacının zamanlaması, nedenleri ve reform faaliyetlerinin analiz edilmesi, buradan elde edilen sonuçların, Türkiye’nin savunma ve güvenliği açısından değerlendirilmesidir. ASS, ulusal kongre raporları, ikincil kaynaklar, dönüşüm ve reformla ilgili veriler, uzman görüşleri ve açık kaynaklardan elde edilen bilgilerle kavramsal ve fonksiyonel olarak değerlendirilmiştir. Çalışma sağlık yönetimi, entegre sağlık hizmetleri, inovasyon ve muharebe hazırlığı temalarının elde edilmesine yönelik, tümevarımsal kodlamanın kullanıldığı, nitel bir araştırma olarak planlanmış ve gerçekleştirilmiştir. Çalışmanın temel bulgusu; muharebe ortamında karmaşıklık arttıkça askeri sağlık organizasyonunda küçük, hızlı, mobil ve deneyim sahibi sağlık birlik ve personeline ihtiyacın artacağıdır. Ayrıca askeri sağlığın uluslararası siyasetteki insancıl gücünün de politikaya hareket sahası kazandırmakta etkili olacağı görülmektedir. ABD’nin reform zamanlamasının, büyük bölgesel savaşların emaresi olarak değerlendirilebileceği ve Türkiye’nin savunma sanayii ile paralel olarak milli askeri sağlık sistemini de en geç 2030 yılına kadar reforme etmesi gerektiği sonucuna varılmıştır. İnovasyon, operasyonel tıp, reorganizasyon ve entegre kayıt sistemleri askeri sağlık sistemlerinin odaklanması gereken, temel reform konuları olarak tespit edilmiştir.
Accelerated Alkali-Silica Reaction After a Seven-Year Asr-Dormancy Period
(Kare Publishing, 2024) Beglarigale, Ahsanollah
The ongoing alkali-silica reaction (ASR) in concrete can be halted by dryness, which is im- portant for repairing ASR-suffered concrete structures. Drying of the concrete establishes an ASR-dormancy period until the end of the dryness. The residual expansion of such concrete after the ingress of water—the end of the dormancy period—is a significant risk, especially for repair works. In this experimental study, the post-dormancy expansion of various mixtures prepared by eight different Portland cement and three different supplementary cementitious materials (SCM) were tested using an accelerated mortar bar test. After accelerated ASR ex- pansions, an ASR-dormancy period was established by keeping the specimens dry for seven years; the residual ASR expansions of the specimens were tested by the same accelerated meth- od. The effect of pre-dormancy reactions on the residual expansions was discussed through two perspectives. The post-dormancy expansion behavior of mixtures without or with insuffi- cient SCM indicated that expansions were primarily driven by the swelling of old gel, whereas in specimens with sufficient SCM, the dominant mechanism was new gel formation, a result of lower pre-dormancy expansions due to the ASR-mitigating effect of SCMs.
Accuracy of Procalcitonin in the Diagnosis of Bacteremia and Discrimination from Contamination
(Istanbul University Press, 2025) Hayirlioglu, N.; Kaya, A.D.; Selale, D.S.; Kurç, M.A.; Varol, G.
Objective: In this study, we aimed to evaluate the concordance of blood culture with procalcitonin (PCT) alone and together with C-reactive protein (CRP) in detecting bacteremia and the diagnostic performance of these biomarkers to differentiate contamination from true bacteremia. Materials and Methods: The medical records of 310 patients were analysed retrospectively. Advia Centaur XP immunoassay system and Au analysers were used to determine PCT and CRP levels, respectively. BacT/ Alert 3D60 hemoculture system was used to incubate blood specimens, and VITEK 2 compact was used to identify isolated strains. Results: The accuracy of PCT and CRP in detecting bacteremia were found to be 68.1% and 36.4%, respectively, and combining PCT and CRP had no added value. In analysis of receiver operating characteristic (ROC), the area under the ROC curve (AUROC) values of PCT and CRP were found to be 0.889 and 0.779 in discriminating the culture-negative group from the culture-positive group, and 0.645 and 0.502 in discriminating bacteremia from contamination, respectively. Conclusion: PCT is a reliable marker that can be used to detect bacteremia. However, its discriminative power was low in differentiating true bacteremia from contamination. Therefore, PCT levels alone should not be used to rule out blood culture contamination. © 2025 Elsevier B.V., All rights reserved.
Adolesan kadın basketbol oyuncularında anaerobık yorgunluğun proprıosepsıyon üzerıne etkısı
(Turkey AsSoc Physiotherapists, 2025) Kilic, Sefa; Alpay, Kubra; Atici, Emine; Soyal, Mehmet; Inal-Gultekin, Guldal
Proproseptif duyudaki eksiklikler yaralanma riskini artırmakta ve sporcunun performansını olumsuz yönde etkilemektedir. Kadın basketbol oyuncularında anaerobik yorgunluğun ve toparlanma sürecinin propriosepsiyon üzerine etkisi üzerinde sınırlı sayıda çalışma bulunmaktadır. Bu amaçla adolesan kadın basketbol oyuncularında anaerobik yorgunluğun alt ekstremite propriosepsiyonu üzerine etkisini değerlendirilmiştir. Çalışmaya 12–16 yaş aralığında 30 lisanslı kadın basketbol oyuncusu dahil edildi. Katılımcıların demografik bilgilerine takiben, istirahat, yorgunluk ve toparlanma olmak üzere üç durumda kalp atım sayıları, 30° ve 60° aktif ve pasif diz eklemi pozisyon hissi ölçümleri yapıldı. Diz eklemi pozisyon hissi ölçümleri için dominant bacakları değerlendirmeye alındı. Anaerobik yorgunluk için bisiklet ergometresinde Wingate anaerobik test protokolü uygulandı ve hemen sonrasındaki yorgunluk durumu verileri alındı. Toparlanma sonrası verilerin alınması için katılımcılar 10 dakika istirahate alındılar. Katılımcıların elde edilen yorgunluk nabızları ortalama 171,6±4,2 atım/dakika olarak tespit edildi ve karvonen formülüne göre hesaplanan iş yoğunluğu %72,7±2,9 olarak belirlendi. Anaerobik yorgunluk sonrası 30° ve 60° diz fleksiyonu aktif eklem pozisyon hissinde istirahat değelerine göre anlamlı azalma saptandı (p>0,017). Yorgunluk sonrası 10 dakikalık toparlanma ile 30° ve 60° diz fleksiyonu aktif eklem pozisyon hissinde tekrar istirahat seviyelerine dönüş olduğu belirlendi. Diz fleksiyonu 30° ve 60° pasif eklem pozisyon hissinde anaerobik yorgunluk sonrası anlamlı farklılık tespit edilmedi. Sonuç olarak, adolesan kadın basketbolcularında anaerobik yorgunluğun diz propripsepsiyonunu azalttağı saptanmış ve çalışmanın literatürdeki benzer bulgularla örtüştüğü görülmüştür. Bunula birlikte, 10 dakika kadar kısa bir toparlanma süresi ile propriyoseptif duyarlılığın başlangıç seviyelerine geri döndüğü görülmüştür.
Advancing Ovarian Cancer Care: Recent Innovations and Challenges in the Use of MXenes and Their Composites for Diagnostic and Therapeutic Applications
(Royal Soc Chemistry, 2025) Farzizadeh, Neda; Zarepour, Atefeh; Khosravi, Arezoo; Iravani, Siavash; Zarrabi, Ali
Ovarian cancer remains the deadliest form of gynecologic malignancy, largely owing to the absence of reliable early diagnostic tools and the limited effectiveness of current therapeutic strategies. Recent advances in nanotechnology-particularly the emergence of two-dimensional materials known as MXenes-offer promising avenues to address these challenges. This review highlights the emerging role of MXenes and their composites in the management of ovarian cancer, focusing on their potential in biomarker detection and targeted treatment strategies. We provide a comprehensive analysis of the latest studies examining the physicochemical features of MXenes, their synthesis and surface functionalization approaches, and their application in ovarian cancer, including biosensing, drug delivery, and combinatorial therapeutic systems. MXene-based biosensors have shown remarkable detection limits in detecting ovarian cancer biomarkers, such as cancer antigen 125 (CA125), human epididymis protein 4 (HE4), lipolysis-stimulated lipoprotein receptor (LSR), and carcinoembryonic antigen-related cell adhesion molecule 5 (CEACAM5). However, several challenges remain, including issues of biocompatibility, structural stability, and clinical scalability. Continued interdisciplinary research is essential to address these limitations, optimize MXene functionalization, and translate their laboratory success into clinical settings. With appropriate advancements, MXenes hold significant promise for enabling more precise, efficient, and patient-specific approaches to ovarian cancer diagnosis and therapy.
Ag and Al2o3/Water Two-Phase Transient Flow Analysis in a Double-Pipe Heat Exchanger Equipped With Baffles and Rotating Inner Tube
(Elsevier Ltd, 2025) Al-Saad, M.; Ali, A.B.M.; Al-Mosallam, M.; Fares, M.N.; Fazilati, M.A.; Salahshour, S.; Sabetvand, R.
Considering the wide application of double-pipe heat exchanger made their performance improvement very important. Employing aqueous nanofluid (NF) of Ag and Al2O3 as the working fluid inside the inner tube of the heat exchanger and its rotation as the respective passive and active enhancing methods are investigated numerically using the two-phase mixture method. The sensitivity analysis was performed to reveal the effect of Reynolds (Re) number, NF concentration and tube rotational speeds on heat transfer coefficient, heat transfer effectiveness, and efficiency ratio. The Re number, NF concentration, and rotation speed lie in 1000-3000, 0–4 %, and 300–500 rpm, respectively. The results show the higher improving effect of Ag rather than Al2O3 nanoparticle; for Re = 1000, 1500 and 2000 the efficiency ratio averaged between different concentrations are 39 %, 30 %, 20 % for Al2O3/water and 62 %, 65 % and 26 % for Ag/water NFs, respectively. By increasing the Re number, the enhancing effect of velocity increment on heat transfer rate prevails and hinders that of employing NF. Also, in rotating mode, the enhancement made by increasing the Re number is higher in the rotation speed of 500 rather than 300 rpm. The overall change of efficiency ratio versus the Re number increment is decreasing and the greatest improving effect of using NF is for the lowest Re numbers. Also, the enhancement due to increasing the Re number increment is higher at a rotational speed of 500 rather than 300 rpm. © 2025 The Authors
Alternative Treatment for Refractory Jacquet Dermatitis After Hirschsprung Disease Surgery: a Case Report
(Elsevier, 2025) Kilic, Sinan; Guven, Ahmet; Isik, Sakine
Introduction: Jacquet's erosive diaper dermatitis (JDD) is a severe form of diaper dermatitis, characterized by papuloerythematous erosions with crater-like borders in the genital and perianal regions. Case presentation: A 2-year-old male patient was diagnosed with Hirschsprung disease (HD) during the neonatal period. A transition zone was detected in the rectosigmoid region on a contrast enema. Full-thickness rectal biopsy confirmed aganglionosis, and a colostomy was created from the transverse colon. At 18 months of age, the patient underwent the Swenson procedure, and the colostomy was closed during the same session. Following the operation, spontaneous stool passage was achieved. Approximately six months after surgery, ulcerative lesions characteristic of Jacquet dermatitis developed in the perianal region. Despite six months of treatment with moisturizers, regenerative, epithelializing, and barrier therapies (e.g., zinc oxide, madecassoside, shea butter, glycerin, oatmeal, hyaluronic acid), the lesions did not improve. However, after initiating treatment with pure Aloe Vera gel, including a 10 % diluted natural extract applied four times daily, plus a dairy-free diet for three weeks, a rapid clinical response was observed, with visible improvement within the same period. Conclusion: The combination of Aloe Vera-based ointment plus dairy-free diet seems to be an effective management strategy for children with post pull-through Jacquet's dermatitis.
Analysis and Comparison of Electric Scooter Crashes: A Review of Crash Characteristics and Health Outcomes in Türkiye
(2024) Dündar, Selim; Okudan, Begüm
Micromobility, including shared e-scooters, has become a convenient mode of transportation for short-distance trips globally. Türkiye introduced shared e-scooters in 2019, quickly expanding their presence. This study analyses and identifies the crash characteristics and health outcomes of e-scooter crashes in Türkiye. It also seeks to provide recommendations for enhancing safety. This review focused on e-scooter crashes in Türkiye, a country with a population of 85,279,553. Our narrative analysis examined eight studies and eight media reports on e-scooter incidents in Türkiye, evaluating patient demographics, crash characteristics (user type, fall/collision, speed, time, location), injury types, interventions, hospitalizations, and modifiable risk factors like helmet use and alcohol consumption. Accidental involvement was slightly higher in men than in women. The rate of helmet usage is quite low. Upper extremity injuries are the most common type, followed by lower extremity injuries. Fatalities have occurred, underscoring public health concerns. E-scooter crashes often involve collisions with pedestrians and vehicles, highlighting the need for adherence to traffic rules and safe riding practices. E-scooters are a practical transportation solution but pose safety risks. Protective measures such as helmet and other protective equipment use, compliance with traffic rules, and public awareness campaigns are crucial to mitigate these risks. We conclude that e-scooter safety regulations in Türkiye should be enhanced to protect riders and pedestrians and promote a safer micromobility ecosystem.
Analysis and Implementation of Sensorless Pmsm Drive With Reduced Dc-Link Capacitance Under Parameter Variations
(Ieee, 2024) Sumsek, Reha Ozgur; Calik, Ramazan; Yavuz, Fikri Serkan; Kivanc, Omer Cihan
In AC drives used in heating, ventilation and air-conditioning applications, film capacitors are becoming widespread instead of electrolytic capacitors in DC-link. These drives with reduced capacitor value provide cost and volume advantages. However, dc-link oscillation increases due to the reduced capacity value. These oscillations cause instability, overvoltage and an increase in total harmonic distortion (THD). On the other hand, the winding temperatures of these motors, which operate continuously under rated operating conditions, reach 80 degrees C. The stator resistance and rotor flux value, which change with the increase in temperature, cause these drives, controlled without sensors, to operate even more unstable. In this study, a hybrid approach is proposed to improve the performance of the inverter using a 16 mu F film capacitor at the dc-link and to reduce the THD. The active damping method regulates the inverter output voltage for DC-link voltage stabilization. A permanent magnet synchronous machine (PMSM) sensorless speed control based on stator feedforward voltage estimation and a model reference adaptive system (MRAS) based on a multiparameter estimation algorithm is performed to minimize the effects of parameter variations. As a result of the experimental studies, it is observed that the grid input current complies with the IEC61000-3-2 standard, even under severe parameter variations.
An Analysis of the Tourism-Led Growth Hypothesis in Turkey at the Provincial Level: A Dynamic Panel Data Approach
(Maliye Bakanligi, 2024) Cinar, Sinan; Has, Banu
This study examines the impact of tourism on economic growth in Turkey at the provincial level using data from the 2008-2020 period and dynamic panel data analysis. Analyses conducted with the Augmented Solow-Swan Model reveal that technology, labor, physical capital, and tourism positively contribute to growth, while human capital has a negative effect. The study makes a unique contribution to the literature as the first research to analyze the impact of tourism on economic growth in Turkey using the most recent provincial data and this model. The findings indicate that the tourism-led growth hypothesis is valid for Turkey.
Analyzing the Cooperation Between Azerbaijan Naval Forces and Türkiye: Strategic, Operational, and Diplomatic Aspects
(2024) Çora, Hakan; Gürson, Alı Poyraz; Mikail, Elnur Hasan; Çora, Ali Nazmi
This study investigates the historical context and strategic evolution of the naval cooperation between Azerbaijan and Türkiye, highlighting its roots in the early years of Azerbaijan's independence following the dissolution of the Soviet Union. As both nations embarked on building and modernizing their naval capabilities, their partnership became a cornerstone of regional security in the Caspian and Black Seas. The study emphasizes how this cooperation has grown from initial diplomatic ties into a robust military alliance, driven by shared strategic interests and mutual security concerns. The analysis delves into the strategic significance of this partnership, focusing on its role in enhancing the stability of a geopolitically sensitive region. The Caspian Sea, with its vast energy resources, and the Black Sea, a critical maritime zone, both play pivotal roles in regional dynamics. By fostering cooperation in these areas, Azerbaijan and Türkiye not only strengthen their own defense capabilities but also contribute to broader regional security frameworks. Operationally, the collaboration between the two nations' naval forces is characterized by joint exercises, training programs, and the establishment of information-sharing mechanisms. These efforts are designed to improve the interoperability of their naval forces, allowing them to respond more effectively to potential security threats. The study also outlines key areas for future collaboration, including maritime domain awareness, counterterrorism operations, and humanitarian assistance, which could further enhance the strategic partnership. By providing a nuanced and multidimensional analysis, this study aims to offer a comprehensive understanding of the Azerbaijan-Türkiye naval cooperation. It explores the implications of this partnership for regional stability, security, and the balance of power, as well as its potential to influence future maritime and geopolitical developments in the wider region.
Anaplastic Thyroid Carcinoma
(Springer Science+Business Media, 2018) Kebudi, A.; Deveci, U.; Çitgez, B.
Anaplastic thyroid carcinoma (ATC) is a relatively uncommon highly malignant tumor originating from the follicular cells of the thyroid gland having a poor prognosis. It accounts for 2-5% of all thyroid carcinomas, and patients typically present with a rapidly growing anterior neck mass with aggressive symptoms. A 66-year-old male presented with dyspnea, neck pain, and voice changes. Ultrasonographic neck examination demonstrated an enlarged thyroid gland and substernal extension of the right thyroid lobe. Fine needle aspiration (FNA) from the thyroid nodule biopsy showed benign cytology. Because of symptomatic disease and radiologic malignancy doubt, operation has been done. Histopathologic examination with frozen section demonstrated anaplastic thyroid carcinoma. After total thyroidectomy, the patient is discharged. The patient died 20 days after the start of systemic treatment because of septic multiorgan failure derived from bronchopneumonic lung infection. In the evaluation of sudden growing neck masses in elderly patients, anaplastic thyroid cancer should be considered as a differential diagnosis, even if the needle biopsy is normal. © Springer International Publishing AG, part of Springer Nature 2019.
Ankrajlı Fore Kazıklı İksa Sistemlerinin Sonlu Elemanlar Yöntemi ile Analizi ve İnklinometre Ölçümleri ile Karşılaştırılması
(2025) Zardarı, Saeid; Saglam, Asli
İnşaat projelerinde derin kazıların yapılması, günümüzde çeşitli faktörler nedeniyle kaçınılmaz hale gelmiştir. Bu tür kazılarda zemin stabilitesini sağlamak amacıyla iksa sistemleri kullanılmakta olup, özellikle eğimli arazilerde, kayma ve göçme riski taşıyan zeminlerin korunması ve bodrum katlı yapıların temellerinin güvenli bir şekilde yerleştirilmesi için oldukça büyük öneme sahiptir. Bu çalışma, ankrajlı fore kazıklı derin kazı destekleme sisteminin etkin kullanımını ve zemin deformasyonlarının izlenmesinin önemini incelemektedir. Sonlu elemanlar yöntemi (FEM) ile modellenen sistemdeki potansiyel deformasyonlar, saha inklinometre ölçümleri ile karşılaştırılmıştır. Zemin verileri, raporlardan ve laboratuvar deneylerinden alınarak belirlenen parametrelerle tasarımda kullanılmış, iksa sistemi PLAXIS programı üzerinden modellenmiştir. Zeminin malzeme modelleri oluşturulmuş ve yatay deformasyonlar ile saha ölçümleri arasındaki farkların sebepleri araştırılmış, bu farkların nedenleri geri analizler aracılığıyla ortaya konulmuştur. Sayısal analiz ve saha ölçümleri, iksa sisteminin yatay deformasyonları etkin bir şekilde kontrol altında tuttuğunu ve güvenli bir tasarım sağladığını ortaya koymuştur. İnklinometre ölçümleri, deformasyonların izlenmesi konusunda önemli bir doğrulama aracı olmuştur. Elde edilen bulgular, derin kazı uygulamalarında iksa sistemlerinin başarısını ve zemin parametrelerinin tasarımda ne kadar önemli olduğunu vurgulamaktadır. Sonuçlar, iksa sistemlerinin tasarımında ve inşaat sürecinde güvenliği artıran önemli bilgiler sunmaktadır.
Antihypertensive Drug Box Sales Between January 2019 - June 2024 in Turkish Drug Market: Investigating the Drug Group and Fix-Dose Combination Sales
(Society of Pharmaceutical Sciences of Ankara (FABAD), 2025) Vural, E.H.; Gümüşel, B.
The financial and emotional burden of chronic diseases, including hypertension, has been rising. The objective of this study was to assess the trends in box sales of antihypertensive medications in Türkiye and to compare these trends across the antihypertensive medicine subgroups. This study analyzed retail and hospital box sales of antihypertensive drug groups recommended by guidelines between January 2019 and June 2024. The data used in this study were obtained from IQVIA. While antihypertensive drugs sold a total of 176,453,254 boxes in 2019, they were sold 203,690,099 boxes in 2023, a 15.44% increase. The best-selling drug group is the Renin-Angiotensin System (RAS) antagonists. Angiotensin Receptor Blocker-Diuretic fixed-dose combination (FDC) is the best-selling subgroup in the RAS antagonists. FDCs of RAS antagonists are more often used than their mono forms, and in 2022 and 2023, FDCs of calcium channel blockers have begun to outsell their combined formulations. Triple FDCs of the RAS antagonists with calcium channel blockers and diuretics have been increasing regularly. In Türkiye, drug groups that have had the highest share in the antihypertensive drug market in recent years are the groups recommended in the guidelines. Increasing the triple FDC consumption is valuable for the rational treatment of hypertension. © 2025 Society of Pharmaceutical Sciences of Ankara (FABAD). All rights reserved.
Antioxidant Activity, Chemical Composition, and Therapeutic Activity of Essential Oils from Certain Lamiaceae Species in Türkiye
(Marmara Univ, Fac Pharmacy, 2025) Goksu Surucu, Canan; Dumlupinar, Berrak; Gurbuz, Burcak; Seker Karatoprak, Gokce; Bahtiyarca, Reyhan; Ilgun, Selen
The study examined the antioxidant, antimicrobial, and potential anticancer properties of lavandin (Lavandula x intermedia 'Grosso'), oregano (Origanum vulgare 'Ulu & gbreve; Bey'), and sage (Salvia officinalis 'Beyhekim') essential oils (EOs). Chemical analysis revealed that oregano is rich in carvacrol (81.23%), cymene (5.51%), and 18-cineole (2.13%). Sage contains notable quantities of alpha-thujone (17.47%), camphor (13.59%), and borneol (12.14%). Lavandin is predominantly composed of linalool (41.10%), linalyl acetate (16.66%), and camphor (10.01%). The antimicrobial tests demonstrated that lavandin EOs exhibited a high inhibition rate of 90.77% at 1000 pg/mL, which subsequently decreased with lower concentrations. The oregano essential oils demonstrated robust antimicrobial activity across all concentrations, with a 10.97% inhibition rate observed even at the lowest concentration. The sage EOs exhibited a rapid decline in antimicrobial activity, reaching 4.97% at the lowest concentration. Both the DPPH and ABTS assays demonstrated that the antioxidant capacity of the essential oils was concentration-dependent. The cytotoxicity values of oregano essential oil were 35.58 at 50 pg/mL, 32.39 at 25 pg/mL, and 30.92 at 12.5 pg/mL. Similar cytotoxicity results were observed for sage and lavandin essential oils. These findings indicate that plant essential oils exert a dose-dependent cytotoxic effect on cell growth, significantly inhibiting cells at high concentrations. The research indicates that essential oils derived from Lamiaceae plants exhibit robust antimicrobial effects against a range of pathogens, suggesting potential applications as alternative therapies for specific microbial infections, comparable to ciprofloxacin at certain concentrations.
Applying different machine learning algorithms to predict the viscosity behavior of MWCNT–alumina/water–ethylene glycol (80:20) hybrid antifreeze
(Elsevier B.V., 2024) Hussein, S.A.; Omar, I.; Saddam, A.B.; Baghoolizadeh, M.; Salahshour, S.; Pirmoradian, M.
While machine learning has become the new way of analyzing data, neutral networks form the basis of this revolutionary technology. In this work, we shall employ the power of neural networks to analyze and demystify the processes in nanofluids. By combining the precision of neural networks with the optimization capabilities of genetic algorithms, we aim to create a more accurate and efficient prediction model for MWCNT-alumina/water-ethylene glycol (80:20) hybrid antifreeze. Our approach entails using an MLP neural network and several training functions (LM, GD, BFGS, BN) with an adjustable number of neurons. The inputs of the network are φ (solid volume fraction or ϕ), temperature (T), and shear rate (γ), and the output is μnf of MWCNT-alumina/water-ethylene glycol (80:20) hybrid anti-freeze. To improve the accuracy of the final model, we use genetic optimization to make final adjustments to the parameters of the neural network. Utilizing the detailed analysis of the primary characteristics of these algorithms, we conclude that the BFGS function is the best to obtain neural network training. Steady performance achieved by this function—0.99828 of the R-value and RMSE value significantly equal to 0.213—illustrates good stability and accuracy of the suggested model. This work contributes to progressing the existing knowledge about the behavior of nanofluids and can stimulate further improvement in heat transfer and energy utilization. © 2024 The Author(s)
Ar-Ge Harcamalarındaki Vergi Teşvik Oranları ile Ekonomik Büyüme İlişkisi: OECD Ülkeleri İçin Panel Veri Analizi
(2025) Has, Banu; Çinar, Sinan
Bu çalışma, 26 OECD ülkesi kapsamında büyük ölçekli firmaların araştırma ve geliştirme (Ar-Ge) harcamaları üzerindeki vergi teşvik oranlarının ekonomik büyüme üzerindeki etkisini incelemektedir. Çalışmada 2004-2020 dönemi için yıllık veriler kullanılarak panel veri analizi yapılmıştır. Analizde dinamik panel veri analiz yöntemlerinden biri olan fark GMM kullanılmıştır. Yıllık büyüme oranı açıklanan değişken olarak kullanılmıştır. Tahmin edilen modelde açıklayıcı değişkenler olarak Ar-Ge’ye uygulanan vergi teşvik oranları, gayrisafi sabit sermaye oluşumu oranı, ortaokul okullaşma oranı ve işgücüne katılım oranı da kullanılmıştır. Sonuçlar, Ar-Ge üzerindeki vergi teşvik oranlarının ekonomik büyüme üzerinde istatistiksel olarak anlamlı bir etkisi olduğunu göstermektedir. Ar-Ge harcamaları üzerindeki vergi teşvik oranı ekonomik büyüme üzerinde pozitif bir etkiye sahiptir. Bu çalışma, Ar-Ge harcamaları üzerindeki vergi teşviklerinin ekonomik büyüme için önemini vurgulamaktadır.
Artificial Intelligence Anxiety Levels of Faculty of Health Sciences Students and Affecting Factors
(AVES, 2025) Çoban, N.; Kar, D.; Berk, Ş.N.
Objective: Artificial intelligence (AI) technology advancements are poised to bring significant changes to the healthcare field. As the adoption of AI systems in healthcare continues to grow, there is an increasing need to equip future healthcare professionals with the necessary knowledge and skills to work effectively with these technologies. This study explores the level of anxiety related to AI and examines the factors influencing this anxiety among university students enrolled in health sciences programs. Methods: This cross-sectional study was descriptive and correlational. The study was carried out with 450 students at the İstanbul Gedik University, Faculty of Health Sciences (Department of Nursing, Physiotherapy and Rehabilitation, Child Development, Nutrition and Diet, Occupational Health and Safety). A descriptive questionnaire and an AI anxiety scale were used to obtain the research data, which were analyzed using numerical data, descriptive statistics, analysis of variance, independent groups t-test, and post-hoc analysis. Results: The mean total score on the Artificial Intelligence Anxiety Scale (AIAS) was 109.642 ± 30.452 (min = 42; max = 147). Among the sub-dimensions of the AIAS, the mean of the Learning sub-dimension was 41.096 ± 12.083 (min = 16; max = 56), the mean of the Job Change sub-dimension was 31.118 ± 9.022 (min = 12; max = 42), the mean of the Sociotechnical Blindness sub-dimension was 21.558 ± 5.892 (min = 8; max = 28), and the mean of the AI Configuration sub-dimension was 15.871 ± 4.831 (min = 6; max = 21). Conclusion: According to this study, students from the Faculty of Health Sciences had a high level of AI anxiety. Significant differences were found between students’ AI anxiety levels according to gender, their thoughts about AI, their trust in AI-based devices, their desire to change their profession because of AI, and their use of AI in patient care. © 2025 AVES. All rights reserved.
Artificial Intelligence in Human-Centric Resilience, Sustainable Systems
(Springer Science and Business Media Deutschland GmbH, 2025) Özok, Ahmet Fahri
Human-Centric Artificial Intelligence (HCAI) is a field of scientific study that concentrates on creating systems and finding solutions. Basically, HCAI is related with abstractions, theories, paradigms, Cognitive Ergonomics and Ethical Concepts. Depending on different factors in every country, HCAI can be used in different levels. The deployment of HCAI gives us the opportunity to consider the social aspects of the environment and consequently to comprehend the interaction between human and all other parameters. Cognitive ergonomies enriches the field of Human-AI collaboration by establishing a rather comprehensive framework. In Human-Centered Man-Machine System (MMS) Design it is not enough the emphasize optimizing the common area between individual operators and their immediate physical and psycho-social environment. © 2025 Elsevier B.V., All rights reserved.
Artificial Neural Networks; Definition, Properties and Misuses
(Nova Science Publishers, Inc., 2021) Güreşen, Erkam; Kayakutlu, Gülgün
There are no such clear and good definitions of ANNs in the literature. Many of the definitions refer to the figures instead of well explaining the ANNs. That is why many weighted graphs (as in shortest path problem networks) fit the definition of ANN. This study aims to give a clear definition that will differentiate ANN and graphs (or networks) by referring to biological neural networks. Although there is no input choice limitation or prior assumption in ANN, sometimes researchers compare ANN achievements with the results of other methods using different input data and make comments on these results. This study also gives examples from literature to misuses, unfair comparisons and evaluates the underlying reasons which will guide researchers. © 2021 Elsevier B.V., All rights reserved.

Browse

Browsing Araştırma Çıktıları / Research Outputs by WoS Q "N/A"