KARAKOÇAN MESLEK YÜKSEKOKULU

Performance of chaotic mapping multi-objective optimization algorithms

2022-04-30T00:04:40Z

Performance of chaotic mapping multi-objective optimization algorithms Eröz, Eyüp; Tanyıldızı, Erkan Multi-objective optimization is defined as the process of producing suitable solutions to problems with multiple objectives. The randomly generated string of numbers is of great importance in achieving solutions close to the global optimum in intuitive multi- objective optimization. Collecting the randomly generated string of numbers in a certain area increases the risk of moving away from the global optimum. Chaotic maps are used to reduce this risk it is not periodic as the variety of numbers produced in chaotic maps is high. For this reason, chaotic maps are used in the random number generation part of optimization algorithms. Chaos-based algorithms have become an important field of study because they are flexible and can escape from local minimums. In this study, the effects of chaotic maps on the new and successful Multi-objective Gold Sine Algorithm (MOGoldSA) were compared with the Multi-Objectıve Ant Lion Optimization (MOALO) algorithm.

Okulöncesi öğretmenlerinin fen eğitimine karşı tutumlarının ve fen etkinliklerine ilişkin yeterliliklerinin incelenmesi

2021-03-23T00:02:53Z

Okulöncesi öğretmenlerinin fen eğitimine karşı tutumlarının ve fen etkinliklerine ilişkin yeterliliklerinin incelenmesi Uğraş, Hilal; Uğraş, Mustafa; Çil, Erol Araştırmanın amacı okulöncesi öğretmenlerinin fen eğitimine karşı tutumları ve fen etkinliklerine ilişkin yeterliliklerinin bazı değişkenlere göre incelenmesidir. Veri toplama araçları olarak, “Fen Eğitimine Karşı Tutum” ve “Fen Etkinliklerine İlişkin Yeterlilik” ölçekleri kullanılmıştır. Araştırmanın çalışma grubunu Elazığ ilinde görev yapmakta olan 169 okulöncesi öğretmeni oluşturmaktadır. Elde edilen verilerin analizleri SPSS 17 paket programı ile t testi, tek yönlü varyans analizi (ANOVA), aritmetik ortalama, yüzde (%), standart sapma ve frekans (f) kullanılarak yapılmıştır. Yapılan istatistiksel analizler sonucunda okulöncesi öğretmenlerinin fen eğitimine karşı tutumlarında ve fen etkinliklerine karşı yeterliliklerinde mesleki deneyimleri ve görev yaptıkları bölgelere göre anlamlı bir farklılık olmadığı sonucuna ulaşılmıştır.

Structural, electrical and photoresponse properties of si-based diode with organic interfacial layer containing novel cyclotriphosphazene compound

2017-11-30T16:29:11Z

Structural, electrical and photoresponse properties of si-based diode with organic interfacial layer containing novel cyclotriphosphazene compound Tataroğlu, A.; Özen, Furkan; Koran, Kenan; Dere, Ayşegül; Görgülü, Ahmet Orhan; Al-senany, Norah; Al-ghamdi, Ahmed; Farooq, W. A.; Yakuphanoğlu, Fahrettin The electrical and photoresponse properties of an Al/p-Si/organic layer/Al diode were investigated. The organic layer containing novel 2,2-bis[spiro(7,8-dioxy- 4-methylcoumarin)]-4,4,6,6-bis[spiro(2’,2”-dioxy-1’,1”- biphenylyl)]cyclotriphosphazene compound was coated by the drop casting method on p-Si having ohmic contact. The structural characterization of the novel cyclotriphosphazene compound was confirmed by using 1H, 13C and 31P-NMR, elemental analysis and FTIR spectroscopic techniques. The diode exhibits a photoconducting and photodiode behavior under solar light illumination. The electrical parameters such as ideality factor, barrier height and series resistance of the diode were determined from I-V characteristics. It is seen that the photocurrent of the diode under illumination is higher than the dark current. Also, the frequency dependence of capacitance (C) and conductance (G) was explained on the basis of interface states. It is evaluated that the hybrid photodiode can be used as a photosensor in organic photodetector applications.

Synthesis, structural and thermal characterizations and in vitro cytotoxic activities of new cyclotriphosphazene derivatives

2017-11-30T16:29:11Z

Synthesis, structural and thermal characterizations and in vitro cytotoxic activities of new cyclotriphosphazene derivatives Koran, Kenan; Tekin, Çiğdem; Çalışkan, Eray; Tekin, Suat; Sandal, Süleyman; Görgülü, Ahmet Orhan We investigated the cytotoxic effects of the newly synthesized cyclotriphosphazene derivatives on A2780 (ovarian), PC-3 and LNCaP (prostate) cancer cell lines. 4′-hydroxy-substituted-chalcone compounds (2–8) were reacted with diphenyl-cyclotriphosphazene (DPP) in the presence of acetone/K2CO3 in order to obtain novel cyclotriphosphazene compounds (DPP 2–8). The structures of DPP 2–8 were characterized by MALDI-TOF mass spectrometry, FT-IR, elemental analysis, 1H, 13C-APT, and 31P NMR measurements. The thermal properties of all phosphazene compounds have been studied after synthesis and characterization procedure. The cytotoxic effects of DPP 2–8 were examined primarily by applying the MTT method based on the measurement of mitochondrial activity. In this regard, several phosphazene compounds have shown high chemotherapeutic effect at low dose (p < 0.05). When the cytotoxic effects of DPP 2–8 at doses of 1, 5, 25, 50 and 100 µM on A2780 cells were examined, it was observed that DPP-3, DPP-4, DPP-5 and DPP-7 were more effective than other derivatives suggested by their high Log IC50 values (p < 0.05). The compounds DPP 2–8 possess cytotoxic activity against PC-3 and LNCaP cells (especially compounds DPP-4 and DPP-5, p < 0.05).