Uludag University Academic Repository
Not a member yet
50710 research outputs found
Sort by
The effects of individual and environmental factors on gross motor skills of 9-12 age children: “The whole is different from the sum of its parts’’
No full textFiziksel uygunluk ve motor yeterlilik, çocukluktan ergenliğe geçiş sürecinde sağlığın korunması ve gelişimin sağlıklı ilerlemesi açısından temel bileşenlerdir. Bu araştırmada Bursa ilinde yaşayan 9–12 yaş grubu çocuklarda biyolojik faktörlerin (yaş, cinsiyet, boy, vücut ağırlığı, vücut kitle indeksi ve biyolojik olgunlaşma) ve çevresel faktörlerin (sosyoekonomik düzey, coğrafi bölge, okul özellikleri ve okul dışı sportif faaliyetlere katılım) kaba motor koordinasyon (KMK) üzerindeki etkisi bütüncül bir yaklaşımla incelenmiştir. Araştırmanın evrenini Bursa’nın üç kentsel merkez ilçesi ile dört kırsal dağ ilçesi oluşturmuş; rastgele seçilen 2094 katılımcıdan dahil edilme kriterlerini sağlayan 1938 öğrenci (400 kırsal, 1538 kentsel) örnekleme alınmıştır. Veri toplama süreci 2023–2024 eğitim-öğretim yılı güz döneminde yürütülmüş; önce çevresel faktörler bilgi formu uygulanmış, ardından 4–16 hafta içinde biyolojik ölçümler tamamlanarak KMK testi gerçekleştirilmiştir. Bulgular, kırsal bölgedeki çocukların KMK puanlarının kentsel akranlarından anlamlı derecede yüksek olduğunu ve yerleşim yerinin (YY) anlamlı bir değişken olduğunu göstermiştir (p0.05). Her iki yerleşim türünde de yalnızca VKİ’nin KMK ile anlamlı ilişki gösterdiği; Biyolojik olgunlaşma (BO), yüksek irtifa, boy, ağırlık, cinsiyet ile okulun fiziksel ve sportif imkânlarının anlamlı etkisinin bulunmadığı saptanmıştır (p>0.05). BO açısından kızlar tüm gruplarda erkeklerden daha ileri düzeydedir. Doğum ayı (bağıl yaş etkisi), BO’yı özellikle 10 yaş kızlar ile 11 ve 12 yaş erkeklerde (yılın ilk yarısında doğanlar lehine) anlamlı düzeyde etkilemesine rağmen (p0.05). Cinsiyet değişkeninin ise KMK becerilerinde yalnızca11 yaş kentsel ve 12 yaş kırsal gruplarda anlamlı etkisi görülmüştür (p0.05). In both types of settlement, only BMI showed a significant relationship with KMK; no significant effect was found for biological maturity (BM), high altitude, height, weight, gender, or the school's physical and sporting facilities (p>0.05). In terms of BM, girls were at a more advanced level than boys in all groups. Although the month of birth (relative age effect) significantly affected BO, particularly in 10-year-old girls and 11- and 12-year-old boys (in favor of those born in the first half of the year) (p0.05). The gender variable had a significant effect on KMK skills only in the 11-yearold urban and 12-year-old rural groups (p<0.05). In conclusion, it can be said that motor coordination is shaped by the dynamic interaction of biological and environmental variables and that multidimensional approaches are important
Evaluation of mathematical literacy teaching in sixth grade with dual focus teaching model
No full textMatematik öğretiminde konu anlatımları kapsamında alıştırmalara ve klasik problemlere yer verilmesi, matematiksel bilginin kazanılmasında önemli bir rol oynamaktadır. Ancak bu tür uygulamalar, öğrencilerin günlük yaşamda karşılaştıkları matematiksel ya da matematiksel olmayan problem durumlarını çözebilmeleri ve edindikleri bilgileri farklı bağlamlara transfer edebilmeleri açısından tek başına yeterli olmamaktadır. Matematik okuryazarlığına yönelik soruların ders içeriklerine dâhil edilmesi, öğrencilerin matematiği gerçek yaşam bağlamlarında kullanabilmelerini kolaylaştırmakta; bu durum, matematiğe verilen değeri artırmakla birlikte matematiğe yönelik olumlu tutum ve motivasyonun gelişmesine de katkı sağlamaktadır. Bu doğrultuda geliştirilen çift odaklı öğretim modeli, yapılandırmacı öğrenme yaklaşımı ve gerçekçi matematik eğitimi kuramlarına dayalı olarak matematik öğretiminin planlanmasına ve uygulanmasına rehberlik eden bir öğretim modelidir. Model, iki temel odak ve bu odaklar etrafında yapılandırılan tamamlayıcı etkinliklerden oluşmaktadır. Bu bağlamda çalışmanın genel amacı, çift odaklı öğretim modeli ile gerçekleştirilen matematik okuryazarlığı öğretiminin altıncı sınıf öğrencilerinin matematik okuryazarlığı düzeyleri, matematiksel yeterlikleri, matematiğe yönelik motivasyonları ve matematiğe değer verme durumları üzerindeki etkilerini incelemektir. Araştırmada, öğretim sürecinin doğal sınıf ortamında uygulanmasına olanak tanıması, süreçte ortaya çıkan sorunların anında belirlenerek iyileştirilmesine imkân sunması ve uygulamanın etkilerinin derinlemesine incelenebilmesi nedeniyle eylem araştırması yöntemi benimsenmiştir. Çalışmanın katılımcılarını Sakarya ilinde bulunan bir ortaokulun altıncı sınıf öğrencileri oluşturmaktadır. Araştırmada veri toplama aracı olarak matematik okuryazarlığı ön test ve son testleri, matematiksel yeterlikleri değerlendirmeye yönelik problemler, problem kurma etkinlikleri, matematiğe değer verme ölçeği ve matematik motivasyon ölçeği kullanılmıştır. Çalışma kapsamında, araştırmacı tarafından çift odaklı öğretim modeline uygun olarak hazırlanan öğretim modülleri uygulanmış ve süreç boyunca öğrencilerin ilgili değişkenlerdeki gelişimleri izlenmiştir. Araştırma bulguları, çift odaklı öğretim modeli ile gerçekleştirilen matematik öğretimi uygulamalarının öğrencilerin matematik okuryazarlığı becerilerini ve matematiksel yeterliklerini artırdığını; ayrıca matematiğe değer verme düzeyleri ile matematiğe yönelik motivasyonlarını olumlu yönde etkilediğini ortaya koymuştur.Including exercises and traditional problems in mathematics instruction plays an important role in the acquisition of mathematical knowledge. However, such practices alone are insufficient for enabling students to solve mathematical or non-mathematical problems encountered in daily life and to transfer their learned knowledge to different contexts. Incorporating mathematics literacy tasks into instructional content facilitates students’ ability to use mathematics in real-life situations. This, in turn, enhances the value attributed to mathematics and contributes to the development of positive attitudes and motivation toward mathematics. Within this framework, the dual-focus teaching model was developed to guide the planning and implementation of mathematics instruction based on constructivist learning theory and realistic mathematics education. The model consists of two main focus and complementary activities structured around these focuses. Accordingly, the primary aim of this study is to examine the effects of mathematics literacy instruction implemented through the dual-focus teaching model on sixth-grade students’ mathematics literacy levels, mathematical competencies, motivation toward mathematics, and their valuation of mathematics. An action research design was adopted in this study, as it allows the instructional process to be implemented in a natural classroom setting, enables immediate identification and improvement of problems arising during the process, and supports an in-depth examination of the effects of the implementation. The participants of the study were sixth-grade students attending a middle school in Sakarya, Türkiye. Data were collected using mathematics literacy pretests and posttests, problems designed to assess mathematical competencies, problem-posing activities, the mathematics value scale, and the mathematics motivation scale. Within the scope of the study, instructional modules developed by the researcher in accordance with the dualfocus teaching model were implemented, and students’ development in the related variables was systematically monitored throughout the process. The findings indicate that mathematics instruction based on the dual-focus teaching model significantly improved students’ mathematics literacy skills and mathematical competencies. Furthermore, the results revealed positive effects on students’ valuation of mathematics and their motivation toward mathematics
The new cyberspace in security and defense intelligence: A review on the metaverse
No full textBu çalışma, savunma istihbaratında metaverse teknolojilerinin potansiyel etkilerini ve entegrasyon süreçlerini kapsamlı bir şekilde incelemektedir. Metaverse, sanal gerçeklik (VR), artırılmış gerçeklik (AR) ve yapay zekâ (AI) gibi ileri teknolojiler aracılığıyla güvenlik operasyonlarının, eğitim süreçlerinin ve veri analizlerinin yürütülmesinde önemli yenilikler sunmaktadır. Savunma ve güvenlik alanında, metaverse’ün sunduğu sanal ortamlar, ulusal güvenlik personelinin gerçek zamanlı simülasyonlar aracılığıyla eğitilmesine, karmaşık operasyonların önceden planlanmasına ve çok yönlü stratejik senaryoların denenmesine olanak tanımaktadır. Bu teknolojiler, operasyonların hız, etkinlik ve hassasiyetini artırırken, aynı zamanda daha maliyet etkin çözümler sunmaktadır. Bununla birlikte, metaverse teknolojilerinin askeri ve istihbari alana entegrasyonu, siber güvenlik, veri gizliliği, etik sorunlar ve ulusal güvenlik politikalarına yeni boyutlar kazandırmaktadır. Metaverse’ün etkili bir şekilde kullanımı, siber tehditlerle mücadele, veri güvenliği ve operasyonların dijitalleşmesi gibi temel alanlarda da yenilikçi çözümler sunabilir. Bu bağlamda, metaverse teknolojilerinin strateji, güvenlik ve savunma sistemlerine entegrasyonu, geleceğin tüm rekabet sahasında ulusal güvenlik politikalarına önemli katkılar sunabileceği varsayılmaktadır. Gelişen teknolojilere adaptasyon süreci, ulusal güvenlik açısından belirleyici bir unsur olacak ve bu teknolojinin sunduğu fırsatlar, ulusal ve uluslararası güvenlik dengelerinde yeni bir dönemi başlatacaktır. Çalışma, iz sürme (tracer) yöntemi ile metaverse olgusunun ortaya çıkışında ve savunma ve istihbarat alanına eklemlendiği ile ilgili bağlamları incelemekte ve siber güvenlik, yeni teknolojiler, iç güvenlik, terörle mücadele, yeni istihbarat yöntemleri gibi ritmik gelişmelerle olan ilişkilerini temellendirmektedir. Araştırmanın bulguları, metaverse’ün güvenlik operasyonları ve istihbarat süreçlerine etkili bir şekilde entegre edilebilmesi için stratejik planlamaların önemine vurgu yapmaktadır.This study comprehensively examines the potential effects and integration processes of metaverse technologies in defense intelligence. The Metaverse offers significant innovations in security operations, training, and data analyses via advanced technologies like virtual reality (VR), augmented reality (AR), and artificial intelligence (AI). In defense and security, virtual environments enable training national security personnel through real-time simulations, pre-planning complex operations, and testing multi-faceted strategic scenarios. These technologies increase operational speed, effectiveness, and precision while offering cost-effective solutions. However, integrating metaverse technologies into military and intelligence domains brings new dimensions to cybersecurity, data privacy, ethical issues, and national security policies. Effective use can offer innovative solutions in combating cyber threats, data security, and operation digitalization. Thus, integrating metaverse technologies into strategy, security, and defense systems is assumed to contribute significantly to future national security policies across the competitive landscape. Adapting to developing technologies will determine national security, initiating a new era in national and international security balances. Using the process tracing method, the study examines the metaverse's emergence and articulation into defense and intelligence fields, grounding its relationships with developments like cybersecurity, new technologies, internal security, counter-terrorism, and new intelligence methods. Findings emphasize the importance of strategic planning for effective integration into security operations and intelligence processes
Enhancing the sociocultural adaptation of syrian migrant women: The effects of family support program
No full textObjective This study examined the effects of a family support program on the sociocultural adaptation processes of Syrian migrant women living under temporary protection in T & uuml;rkiye.Background Migration presents significant challenges, particularly for women balancing family responsibilities while adapting to new cultural contexts. Family support programs effectively enhance migrant integration by addressing challenges related to communication, social participation, and access to local resources. Limited research has examined how such programs affect the sociocultural adaptation of migrants, however.Method This study used a convergent mixed-methods design. Quantitative data were gathered using the Sociocultural Adaptation Scale, and qualitative data were obtained through interviews, including 15 focus group interviews and five individual interviews. The sample consisted of 117 women, with 59 assigned to the experimental group and 58 to the control group. The experimental group participated in a 10-week family support program, while the control group did not receive any intervention.Results The program significantly improved participants' sociocultural adaptation, with notable progress in interpersonal communication, personal interests, and ecological adaptation. Quantitative results showed no significant improvements in academic/work performance or language proficiency, however. Qualitative data highlighted enhanced family and social communication, increased self-confidence and autonomy, improved daily life management, and a greater sense of social acceptance.Conclusion The program played a crucial role in improving women's sociocultural adaptation by fostering communication, personal growth, and better access to community services. Challenges related to language and employment remained, however, indicating a need for targeted interventions in these areas.Implications Family support programs enhance migrant women's sociocultural adaptation. Expanded programs focusing on language and employment could improve outcomes further
Environmental effects on the electrical resistivity of hybrid carbon fiber-carbon black cementitious composites: Experimental and machine learning perspectives
No full textThis study investigates the electrical resistivity behavior of cementitious composites incorporating carbon fiber (CF), carbon black (CB), and their hybrid combinations under varying curing ages, humidity levels (0-100%), and temperatures (0 degrees C to 120 degrees C). 16 different mixtures are prepared with CF contents up to 0.9 vol.% and CB contents up to 9 wt.% of cement. Experimental results reveal that hydration-induced densification significantly increases resistivity in plain cement paste (from 267.5 to 999.5 Omegacm over 28 days), whereas hybrid CF-CB composites maintain low and stable resistivity values (3.9-7.1 Omegacm), demonstrating superior environmental robustness. Moisture loss and sub-zero temperatures markedly increase resistivity in the control specimen, while conductive fillers preserve electrical continuity. At elevated temperatures, hybrid composites exhibit a thermally stable conductive response, in contrast to the signal degradation observed in the control due to thermal cracking. Machine learning models (XGBoost, SVR, and MLP) are employed to predict resistivity based on five input variables, achieving high predictive accuracy, with XGBoost reaching an R2 of 0.981 on test data. SHAP analysis identifies carbon black as the dominant contributor to conductivity, quantitatively validating the synergistic CF-CB mechanism. These findings demonstrate a scalable pathway for designing environmentally resilient, self-sensing cementitious materials supported by data-driven modeling
Turkish pediatricians' competence concerning children's oral and dental health
No full textObjective: To assess Turkish pediatricians' knowledge, perceptions, and educational levels regarding oral and dental health, particularly in light of the high prevalence of dental caries among children. Material and Methods: A cross-sectional study involved 323 practicing Turkish pediatricians utilizing Google Forms for data collection between December 2021 and November 2023. A structured questionnaire examined sociodemographic and clinical characteristics and employed scales to evaluate pediatricians' knowledge, attitudes, and self-perceptions concerning childhood oral health. Results: The study included 323 pediatrician participants, with a mean age of 37.15 +/- 7.92 years, with a majority being female (65%). Academic staff demonstrated superior knowledge, positive attitudes, and higher self-perception scores than research assistants and specialists. Significant correlations were observed between age and years of service with attitudes and self-perceptions, while knowledge scores showed no such correlations. Pediatricians without formal dental education exhibited lower attitude and self-perception scores related to oral health. Conclusion: The study emphasizes the critical need for targeted education to enhance Turkish pediatricians' grasp of oral health. Strengthening their knowledge and attitudes is essential to advancing dental care, improving children's outcomes, and addressing dental caries effectively
Clinical and histopathological characteristics of prurigo pigmentosa: A case series
No full textIntroduction: Prurigo pigmentosa (PP) is a rare inflammatory skin disease, first described in 1971 in Japan. The condition is characterized by the abrupt appearance of pruritic, erythematous, maculopapular lesions that typically resolve within several days to weeks, resulting in reticulated hyperpigmentation. Objective: This study aimed to retrospectively evaluate six cases of prurigo pigmentosa in light of clinical and histopathological features and treatment responses. Methods: This retrospective study was performed at the Department of Dermatology, Bursa Uludag University Faculty of Medicine, Bursa, T & uuml;rkiye, from 2022 to 2025. Six patients were included in the study, and their demographic characteristics, presenting complaints, clinical and histopathological findings, laboratory results, and treatment responses were assessed. Results: Six patients with prurigo pigmentosa were evaluated. All presented with symmetrical, pruritic erythematous eruptions on the trunk and back. Three had a history of ketogenic diet or rapid weight loss. Five patients received oral doxycycline (100-200 mg/day) and demonstrated marked clinical improvement. One patient initially treated with corticosteroids showed worsening and was switched to doxycycline. Histopathology revealed spongiotic dermatitis (N=3), eosinophilic infiltration (N=2), and interface dermatitis (N=1). Elevated serum IgE levels were detected in two cases. Conclusion: In conclusion, prurigo pigmentosa should be suspected in young patients with symmetric pruritic eruptions and a history of ketosis. Awareness of its variable histopathological findings and its strong association with dietary or metabolic triggers is essential to timely diagnosis. The rapid and consistent response to tetracycline-class antibiotics, particularly doxycycline, underscores their value as both a diagnostic aid and a preferred therapeutic option
Controlling surface roughness in industrial zinc phosphating: From bath chemistry to carbon footprint
No full textSurface roughness is a quality-critical attribute in industrial zinc phosphating, directly affecting sealing performance, coating uniformity, dimensional tolerances, and first-pass production yield in automotive pretreatment lines. While the chemical mechanisms of phosphate coating formation are well understood, the translation of this knowledge into statistically defensible, production-scale prioritization of bath chemistry control levers under real manufacturing constraints remains limited, particularly with respect to surface roughness stability and its environmental implications. This study investigates surface roughness control in a fully operational industrial zinc phosphating line by systematically evaluating the effects of pickling acid chemistry (H2SO4 versus H3PO4), dissolved ferrous iron (Fe2+) levels in pickling and phosphating baths, and nitrate accelerator dosage. A Taguchi L16 (24) experimental design was implemented under real manufacturing constraints. Surface roughness (Rz) was measured in accordance with ISO 4287 and analyzed using a general linear model supported by partial effect size estimation (eta p2) and bootstrap confidence intervals. This approach enables statistically robust ranking of dominant and secondary control parameters, rather than qualitative trend confirmation alone. The robustness of statistically identified trends was independently verified using paired measurements from 25 production components, while scanning electron microscopy provided qualitative mechanistic support. The results demonstrate that pickling acid chemistry and nitrate accelerator dosage are the dominant control parameters governing surface roughness stability, whereas Fe2+ concentration does not act as a primary independent driver within the defined Fe2+ concentration ranges investigated in this study, but contributes through interaction-dependent mechanisms. Phosphoric acid pickling combined with nitrate acceleration consistently yields lower and more stable roughness values. In addition, roughness-related nonconformities were translated into product carbon footprint outcomes using an ISO 14067-aligned, gate-to-gate framework with Monte Carlo uncertainty analysis, explicitly quantifying the carbon footprint penalties associated with quality-driven rework and external return logistics under industrial production conditions
Prediction of osnr with machine learning methods in dwdm/udwdm long-haul transmission systems using edfas under the triple impact of fwm, srs and ase noise
No full textIn this research, four different machine learning (ML) algorithms have been used to predict the optical signal-tonoise ratio (OSNR) at central channels of dense and ultra-dense wavelength division multiplexing (DWDM/ UDWDM) communication systems under the triple impact of four-wave mixing (FWM), stimulated Raman scattering (SRS), and amplified spontaneous emission (ASE) noise. The ML algorithms used in the research are Gaussian Process Regression (GPR), Narrow Neural Network (N-NN), Boosted Trees (BT), and Quadratic Support Vector Machines (QSVM). 7-, 15-, 31- and 63-channel configurations have been considered for DWDM/UDWDM systems. Two different datasets have been created to predict the OSNR value. The datasets used to predict the OSNR value have been created considering DWDM/UDWDM system configurations with 3.125 GHz-100 GHz channel spacing range and 1, 2, 4, and 5 erbium-doped fiber amplifiers (EDFAs). For the first data set, where the channel input powers have been varied between 0.1 mW and 5 mW, OSNR values have been predicted with the best goodness-of-fit metrics using GPR. For the second data set, where the total transmission length has been varied between 1 km and 150 km, OSNR values have been predicted with the best goodness-of-fit metrics using N-NN for 7-channel DWDM/UDWDM systems and GPR for 15-, 31-, and 63-channel DWDM/UDWDM systems. The detailed analysis presented in this paper will provide a new perspective on estimating the performance of AI integrated WDM-based transmission systems
Optimizing the use of pce-based grinding aids: The critical role of ph on early-age cement hydration kinetics
No full textPolycarboxylate ether (PCE) water-reducing admixtures have emerged as promising solutions to optimize clinker grinding and properties. The increased adsorption ability of PCE and creation of narrow particles, despite maintaining constant Blaine fineness, has sparked the interest of their use as grinding aids (GAs) in the cement industry. This study aims at synthesizing different PCEs at three distinct pH values (i.e., 4, 7, and 9), and assessing their interactions with the cement hydration kinetics and strength development at early ages. Ten cements were produced by incorporating the synthesized PCEs at three dosage rates of 0.025%, 0.05%, and 0.1%, by weight of clinker and gypsum materials. The mixtures were tested for Fourier-transform infrared spectroscopy (FTIR) spectra, X-ray diffraction, thermogravimetric analysis, scanning electron microscopy, setting time, heat calorimetry, and early-age strength. This comprehensive analysis revealed the significant pH impact on clinker comminution and sieve residues as well as the early-age hydration kinetics, formation of hydrated products, and strength development.Turkish Academy of Science