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Öğe GSelf-MapReduce: A Method for Enhancing Mapreduce Performance in Distributed Heterogeneous Data Centers(IEEE, 2024) Şeşen, Emin; Kırışoğlu, Serdar; Kara, ResulBig data are often stored close to the locations where they are generated, owing to the cost of data transfer. These stored data are moved to a single location for processing or processed at that location. In the literature, it is possible to find different methods for processing data in distributed data centers. In this study, we present a new method for data processing called GSelf-MapReduce. In the proposed method, shuffling is performed among heterogeneous data center (DC) that complete the data-processing process. To calculate the data processing cost of the reduce function of the DCs, a polynomial regression model was created using the data obtained in the test environment, and the coefficients obtained from this model were used in the decision process. The key/value pairs to be shuffled are distributed according to the cost of the DCs, considering their location. In addition, not all DCs are waited to finish their job for shuffling. DCs that complete their job perform shuffling among themselves. Thus, the keys are deduplicated between these DCs. The shuffling volume in the last phase and the total job completion time are reduced. The performance of the proposed method was compared with that of four different distributed data processing methods in the literature. As a result, this work generates 15% less shuffled data than the closest work.Öğe Dielectric property enhancement of glass fiber-reinforced concrete via TiO? nanocomposites(Elsevier, 2025) Ramazanoğlu, Doğu; Subaşı, Azime; Musatat, Ahmad Badreddin; Demir, Ahmet; Subaşı, Serkan; Maraşlı, MuhammedThis study addresses the critical gap in traditional glass fiber-reinforced concrete (GFRC), which lacks tailored electrical properties for modern energy-related applications. We introduce a novel approach by incorporating a TiO?-based hybrid composite (TiO?-@) into GFRC to develop multifunctional composites with enhanced dielectric, mechanical, and energy storage capabilities. Experimental results demonstrate that TiO?-@ doping at 2 % concentration achieves the most significant improvements: a dielectric constant increase to ~420 at 100 Hz (compared to ~180 for undoped GFRC), capacitance enhancement to 71 pF at 100 Hz (versus 18 pF in the reference), and AC conductivity elevation by 205 % after aging. The 2 % TiO?-@ sample also exhibited a Leeb hardness increase to 486 HLD (from 159 HLD pre-aging), highlighting its structural robustness. Frequencydependent analyses revealed modified polarization mechanisms and charge transport dynamics, with ColeCole plots and impedance spectroscopy confirming reduced capacitive reactance and enhanced interfacial interactions. These results establish TiO?-@ as a transformative additive for GFRC, bridging the gap between structural performance and energy functionality. The work pioneers the integration of TiO? nanocomposites into cementitious matrices, offering a dual-purpose material for smart construction systems and embedded energy storage devices.Öğe Elektrik direnç punta kaynağı ile üçlü birleştirilen FEP05/DP600/FEP05 çelik saclarda kaynak parametrelerinin mekanik özelliklere ve mikroyapı üzerindeki etkilerin araştırılması(Gazi Üniversitesi, 2024) Selova, L.; Tunçel, Oğuz; Çavuşoğlu, Oktay; Dindar, Ç.; Aydın, H.Günümüz otomotiv endüstrisinde, farklı malzemelerin elektrik direnç punta kaynağı ile ikili ve üçlü birleştirmelerinde yaygın olarak kullanılmaktadır. Araba gövdelerinin a-, b- ve c sütunlarında çift fazlı (DP) 600 çelikleri ve FEP05 çelikleri sıklıkla birbirine kaynaklanır. Bu çalışmada kaynak akımı, kaynak zamanı ve elektrot kuvveti gibi elektrik direnç punta kaynağı proses parametrelerinin yük taşıma kapasitesi, uzama, çekirdek çapı ve üçlü kaynaklı sac bağlantıların (FEP05 + DP600 + FEP05) çökme miktarı üzerindeki etkisi araştırılmıştır. Kaynaklı birleştirmenin mekanik özelliklerini belirlemek için çekme testleri ve mikrosertlik ölçümleri yapılmıştır. Kaynak kalitesini analiz etmek için mikroyapısal karakterizasyon kullanılmıştır. Ayrıca üçlü kaynaklı birleştirmelerde kaynak zamanının, kaynak akımının ve elektrot kuvvetinin önemli faktörler olduğu gösterilmiştir. Sonuç olarak, Kaynak parametreleri uygun seçilerek FEP05 + DP600 + FEP05 levhalarının elektrik direnç punta kaynağı ile üçlü olarak başarılı şekilde birleştirilebileceği görülmüştür.Öğe Mechanical characterization and microstructure of fiber laser welded TWIP980 steel depending on welding speed and focal distance(Elsevier, 2023) Çavuşoğlu, Oktay; Yuce, C.; Aydın, H.The TWIP steels are preferred in the automotive industry due to excellent strength and ductility. In this study, the effect of fiber laser welding parameters has been investigated on the mechanical properties and microstructural points of view twinning-induced plasticity (TWIP) steel. The variation of the mechanical properties depending on fiber laser welding parameters has been determined. The samples were laser-welded with different speeds and focal distances the laser power constant at 4 kW. The stress and elongation decreased when the welding speed increased. The highest stress was obtained at + 1 focal distance. The best energy absorption was seen in b-3 combination (laser power 4 kW, welding speed 130 mm/s, focal distance +1 mm)Öğe Influence of oscillating fiber laser welding process parameters on the fatigue response and mechanical performance of butt-jointed TWIP980 steels(De Gruyter Brill, 2025) Çavuşoğlu, Oktay; Aydın, H.; Eroglu, M.; Davut, K.In this study, the effect of laser power, welding speed, linear heat inputs on the mechanical performance of TWIP980 steels joined by oscillating fiber laser welding in butt welding configuration was investigated. Oscillating fiber laser welding were changed: laser power from 1.2 to 1.6?kW, welding speed from 20 to 30?mm?s?1, linear heat input from 40 to 80?J?mm?1. The tensile, hardness and fatigue tests were carried out to determine mechanical performance. A significant improvement in weld penetration, fatigue performance and mechanical properties was detected at linear heat inputs above 53.33?J?mm?1. The best mechanical properties were obtained at 1.6?kW laser power and 25?mm?s?1 welding speed. The study reveals that linear heat inputs, laser power, and welding speed have significant effects on mechanical performance and weld geometry. Furthermore, the results demonstrate that oscillating fiber laser welding enables good weldability even at low laser power.Öğe Triple joining of different sheets with self-pierce riveting method(SAGE, 2022) Çavuşoğlu, Oktay; Bakırcı, A.; Dinkçi, H.; Yılmazoğlu, A. G.Self-piercing riveting (SPR) is a high-speed mechanical joining technique for sheet metal materials. In this study, the mechanical properties of DC04 steel and AA5182 aluminium alloy in triple combinations joined by the SPR method were investigated. For this purpose, triple-joining processes were performed in different combinations, and macro-structural analysis and tensile shear tests were carried out by comparing their mechanical properties. As a result of the study, the highest shear forces were obtained in FFA (DC04-DC04-AA5182) and AFF (AA5182-DC04-DC04) combinations. As the number of aluminium layers increases, the probability of tearing increases in triple joining. Higher spread ratios were generally measured under conditions with hard materials in the upper layers and soft materials in the lower layersÖğe Microstructural features and mechanical properties of 22MnB5 hot stamping steel in different heat treatment conditions(Elsevier, 2020) Çavuşoğlu, Oktay; Çavuşoğlu, Oktay; Yılmazoğlu, A. G.; Üzel, U.; Aydın, H.; Güral, A.In this study, the microstructure and mechanical properties of the 22MnB5 steel sheet were investigated in different heat treatment conditions. The steel sheet heated to 700?°C, 800?°C, and 900?°C was subjected to air cooling, water quenching, and water quenching?+?tempering procedures. Microstructural properties post-heat treatment were analyzed under an optical microscope. To determine the mechanical properties, uniaxial tensile tests, and hardness measurements were performed. The highest mechanical properties were achieved with the water quenching from 800?°C and 900?°C. The elongation value was ranged of 2-4% with the water quenching. Also, the tempering process slightly increased the elongation value.Öğe Light-transmitting wood-based composite comprising microencapsulated phase-change material for sustainable energy applications in buildings.(Taylor&Francis, 2025) Can, A.; Gencel, O.; Ustaoğlu, A.; Sarı, A.; Muñoz, P.; Subaşı, Azime; Hekimoğlu, G.; Maraşlı, MuhammedThe study explored an innovative building material that provides both lighting energy savings and thermal comfort by integrating microencapsulated phase change material (µPCM) into light-transmissive wood-based composite material. The wood-based composite comprises epoxy resin (Er), wood chips (Wc), fibre (Gf), various ?PCM concentrations, and plastic optical grids to transmit light through the plate. The highest thermal conductivity, 0.21 W/mK, was observed for µPCM0 samples. Differential scanning calorimetry (DSC) analysis presented that a composite containing 100 wt% µPCM has a melting temperature of 25 °C and a latent heat storage of 35.0 J/g. µPCM100 offered a lower surface temperature approximately 6 °C colder when the hot weather hours were taken into account. The wood composites with µPCM contributed to maintaining lower peak room temperatures and extended temperature stability overnight. While 1.923 km/s UPV was obtained in µPCM0 samples, the UPV value after 100% µPCM addition compared to the weight of the old was 1.845 km/s. Compared to the µPCM0 samples, the ErµPCMWc samples had a light transmittance rate of almost 64% greater. The study's findings could improve artificial lighting efficiency, significantly lessening indoor temperature fluctuations, enhancing thermal comfort and promoting sustainable building solutions.Öğe Multifunctional SnO2-@ doped glass fiber?reinforced concrete: Improved microstructure, mechanical, dielectric, and energy storage characteristics(Elsevier, 2025) Ramazanoğlu, Doğu; Subaşı, Azime; Musatat, Ahmad Badreddin; Demir, Ahmet; Subaşı, Serkan; Maraşlı, MuhammedThis study explores SnO?-based hybrid composite (SnO?-@) doped glass fiber-reinforced concrete (GFRC) for enhanced dielectric, energy storage, and mechanical performance. Microstructural analysis confirmed SnO?-@ promotes ettringite and calcium silicate hydrate (C-S-H) formation, improving matrix integrity. Aged samples exhibited a 650?% increase in surface roughness (Ra) and over 200?% higher Leeb hardness, demonstrating durability. Dielectric spectroscopy revealed frequency-dependent tunability: 1?% SnO?-@ achieved a peak dielectric constant (?' = 130 at 10?kHz), shifting to ?' =?140 at 100?kHz for 2–3?% doping. AC conductivity surged by 60?%, correlating with SnO?-@-induced interfacial polarization and charge mobility. Energy storage capacity improved significantly, attributed to optimized dipole alignment and reduced leakage currents. Color stability remained robust (?E* ? 2.8 post-aging), ensuring aesthetic viability. These results position SnO?-@-doped GFRC as a multifunctional material for smart infrastructure, integrating structural resilience, adaptive dielectric properties, and energy storage potential for next-generation urban applications.Öğe Polyimide strengthened cement mortar(WALTER DE GRUYTER GMBH, 2024) Poyraz, Bayram; Dayı, MustafaThis study examined the effects of silane-modified polyimide polymer (PIS) on cement mortar. The PIS was added to replace cement in a specified ratio. Obtained results revealed that the PIS caused retardation on setting time, and accelerated UPV mostly by encapsulating unhydrated cement particles, filling pores, or reacting with C-S-H and Ca(OH)2 with shifting to Si-O vibrations. SEM results showed a good compact interface without forming considerable agglomeration and voids on the microstructure, and this improved flexural and compressive strength properties. In conclusion, silane-modified polyimide as an admixture or cement replacement can be recommended for construction industries to enhance the properties of cement mortar.Öğe Alleviating doxorubicin-induced reproductive toxicity: protective and androgenic effects of drone larvae on sperm morphology and hormonal balance(Springer, 2025) Ağan, Kağan; Kaya, Salih Tunç; Ağan, Aydan Fulden; Yoldaş, Pınar Ağyar; Yoldaş, Taner; Keleş, Ayşe İkinci; Kekeçoğlu, MeralÖğe Investigation of Cytotoxic, Antimetastatic and Apoptotic Activities of Jerusalem Artichoke (Helianthus tuberosus L.) Extracts: Comparison with MCF-7 and MCF-12A Cells(Kahramanmaras Sutcu Imam Univ Rektorlugu, 2024) Beyazyu, Fadime; Arslan, Emine; Koygun, GozdeJerusalem artichoke (Helianthus tuberosus L.) is an important medicinal plant due to its composition of several bioactive substances, high antioxidant activity, rich inulin content and produces functional food ingredients. Complementary alternative medicine therapies become more popular for cancer treatments because of higher efficiency, lower cost and minimum side effects. This study reported anti -cancer efficiency of both shell and tuber extract of Jerusalem artichoke (JA) on different breast cell lines with the purpose of discovering new alternative medicine therapies. Cytotoxic effects of JA were evaluated by XTT method by using different concentrations on different incubation times (24h, 48h and 72h). Invasion, adhesion and apoptotic studies were performed with IC50 values for 48h and 72h. JA extracts do not show cytotoxic activity on healthy human breast cell, while they induce tumoral cell death with dose and timedependent manner. The most effective doses of tuber and shell extracts were 108.8 mu M and 134.2 mu M at 48h and 20 mu M ve 5 mu M at 72h, respectively. It demonstrated robust anti -metastatic activity on MCF-7 cell lines because it inhibited adhesion, and invasion, significantly. TMRE and AnnexinV/7AAD staining were used for determine to mitochondrial membrane potential and nuclear morphology, respectively The results were found consistent with each other. Overall, this paper which first in literature demonstrates the anti -cancer efficacy of the JA both tuber and shell extract which can be proposed as a potent candidate for the treatment of breast cancer.Öğe Novel Tetrazole And 1,3,4-Oxadiazole Derivatives Synthesis, Molecular Docking, Adme, Potential Activator For Rabbit Muscle Pyruvate Kinase(Univ Babes-Bolyai, 2024) Kaya, Mustafa Oguzhan; Demirci, Tuna; Karipcin, Selman; Ozdemir, Oguzhan; Kaya, Yesim; Arslan, Mustafa. The activation of muscle pyruvate kinase (PK) increases the conversion of phosphoenolpyruvate (PEP) to pyruvate, which results in the production of ATP. This is critical for supplying the energy needed for muscle contraction. In this study, we synthesized 1,4-dihydropyridine/pyridine compounds bearing tetrazole and 1,3,4-oxadiazole groups by using Hantzsch method and characterized by FT-IR spectroscopy, elemental analysis, and The studies revealed that all original synthesized compounds activated PK and AC50 (half-maximal activating concentration) values of the compounds were extremely effective (1.30 mu M to 14.65 mu M).Öğe Water and Conflict in the Middle East(Seta Foundation, 2024) Ilkbahar, Hasan[No abstract available]Öğe EARTHQUAKE DISASTER AND ITS' ACUTE EFFECT ON PEDIATRIC HEMATOLOGY AND ONCOLOGY.IN TURKIYE; TURKISH PEDIATRIC ONCOLOGY GROUP-TPOG QUESTIONARE STUDY(Wiley, 2023) Tacyildiz, Nurdan; Ozdemir, Sonay Incesoy; Kupeli, Begul; Cemaloglu, Mustafa; Acipayam, Can; Oncel, Kahraman; Akinel, Ayse Nur[No abstract available]Öğe Critical equimatchable graphs(Centre Discrete Mathematics & Computing, 2024) Deniz, Zakir; Ekim, TinazA graph G is equimatchable if every maximal matching of G has the same cardinality. In this paper, we investigate equimatchable graphs such that the removal of any edge creates a graph that is not equimatchable, called edge -critical equimatchable graphs (ECE-graphs). We show that apart from two simple cases, namely bipartite ECE-graphs and even cliques, all ECE-graphs are 2 -connected factor -critical. Accordingly, we give a characterization of factor -critical ECE-graphs with connectivity 2. Our result provides a partial answer to an open question posed by Levit and Mandrescu [Eur. J. Comb. 20 (2019), 261-272] on the characterization of wellcovered graphs with no shedding vertex. We also introduce equimatchable graphs such that the removal of any vertex creates a graph that is not equimatchable, called vertex -critical equimatchable graphs (VCE- graphs). To conclude, we clarify the relationship between various subclasses of equimatchable graphs (including ECE-graphs and VCE-graphs) and discuss the properties of factor -critical ECE-graphs with connectivity at least 3.Öğe Fatty acid composition of stems, leaves, flowers, and seeds of some medicinal plants(Innovhub Ssi-Area Ssog, 2023) Kokten, Kagan; Mokhtarzadeh, Sam; Cacan, Erdal; Kutlu, Mehmet Ali; Ozdemir, Selim; Ucar, Ridvan; Ekmekci, MuammerMedicinal plant species are economically important and have many uses. In this research, the stem, leaves, flowers, and seeds of some medicinal plant species such as Lavandula intermedia, Satureja hortensis and Ocimum basilicum were analysed. The fatty acid compositions of these three different species were determined by gas chromatography of methyl esters of fatty acids. The stem, leaf, flower, and seed oils of L. intermedia contain 44.72%, 45.11%, 29.89% and 8.55% palmitic acid and 16.18%, 23.21%, 34.76% and 39.76% linolenic acid, respectively, as the main component fatty acids, while the stem, leaf, flower and seed oils of S. hortensis contain 23.11%, 11.76%, 13.32% and 6.26% palmitic acid and 31.70%, 51.74%, 47.97% and 43.79% linolenic acid, respectively, as main component fatty acids. On the other hand, stem, leaf, flower, and seed oils of O. basilicum contain 44.72%, 45.11%, 29.89% and 8.55% palmitic acid and linolenic acid 16.18%, 23.21%, 34.76% and 39.76%, respectively, as main component fatty acids.Öğe Morphological and Molecular Analysis of Incidental Neoplasia in Explanted Lungs with UIP/IPF: A Single Centre Experience(Elsevier Science Inc, 2023) Lunardi, F.; Verzeletti, V.; Pezzuto, F.; De Chellis, C.; Tauro, V.; Fortarezza, F.; Kilitci, A.[No abstract available]Öğe Cell(Rector Ciu Cyprus Int Univ, 2023) Gozen, Hacer; Edman, Timucin Bugra; Guven, Edman-Samet[No abstract available]Öğe Efficacy of Sinapic Acid Administration in a Model of PenicillinInduced Epilepsy(Wiley, 2023) Coskun, Ayca; Beyazcicek, Ersin; Beyazcicek, Ozge; Gok, Ali[No abstract available]
