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• MakaleAçık Erişim2025Scopus SJRQ2/r/bayburt/12660
  Development of a Clinical Decision Support System Using Artificial Intelligence Methods for Liver Transplant Centers

  Yağanoğlu, Mete; Öztürk, Gürkan; Bozkurt, Ferhat; Bilen, Zeynep; Yetiş Demir, Zühal; Kul, Sinan; Şimşek, Emrah; Kara, Salih; Eygu, Hakan; Altundaş, Necip

  The objective of this study is to utilize artificial intelligence techniques for the diagnosis of complications and diseases that may arise after liver transplantation, as well as for the identification of patients in need of transplantation. To achieve this, an interface was developed to collect patient information from Atatürk University Research Hospital, specifically focusing on individuals who have undergone liver transplantation. The collected data were subsequently entered into a comprehensive database. Additionally, relevant patient information was obtained through the hospital’s information processing system, which was used to create a data pool. The classification of data was based on four dependent variables, namely, the presence or absence of death (“exitus”), recurrence location, tumor recurrence, and cause of death. Techniques such as Principal Component Analysis and Linear Discriminant Analysis (LDA) were employed to enhance the performance of the models. Among the various methods employed, the LDA method consistently yielded superior results in terms of accuracy during k-fold cross-validation. Following k-fold cross-validation, the model achieved the highest accuracy of 98% for the dependent variable “exitus”. For the dependent variable “recurrence location”, the highest accuracy obtained after k-fold cross-validation was 91%. Furthermore, the highest accuracy of 99% was achieved for both the dependent variables “tumor recurrence” and “cause of death” after k-fold cross-validation.

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  AtıfScopus2·WoS2·OpenAlex2

  İncele
• MakaleAçık Erişim2024/r/bayburt/16368
  L Tipi Matris ve Fine-Kinney Metodları Kullanılarak Erzurum Havalimanı’nın Çevresel Risk Değerlendirmesi

  Kul, Sinan; İrdemez, Şahset; Ozdemir, Mustafa; Bedir, Ferdin

  Dünya ekonomisinde önemli bir yeri olan havacılık sektörü diğer birçok sektör ile karşılaştırıldığında çok daha yüksek bir büyüme oranına sahiptir. Günümüzde küresel sera gazı emisyonlarının yaklaşık %2'sinin bu sektörden kaynaklandığı ve ilerleyen yıllarda bu emisyonların sektörün büyüme oranları ile paralel olarak artacağı düşünülerek gerekli tedbirlerin vakit kaybetmeden alınması yerinde olacaktır. Havalimanlarının inşaat faaliyetleri süresince ekosistem olumsuz olarak etkilenirken, havalimanı altyapılarının yüksek enerji ihtiyaçları, işletme aşamasında oluşan önemli miktarlardaki atık maddeler, havalimanı operasyonlarından kaynaklanan gürültü emisyonları vb. nedenler yerel halkın refahını önemli ölçüde etkileyebilmektedir. Havalimanlarında yürütülen uygulamaların çevreyi ve yerel halkı etkilediği göz önünde bulundurulduğunda, ekonomik gerekçeleri bahane etmeden havalimanlarının yönetimleri tarafından düzeltici önlemlerin uygulamaya alınması gerekmektedir. Bu çalışmada bahsi geçen çevresel problemler değerlendirilerek, Erzurum Havalimanı’nın işletilmesi sürecinde, risk değerlendirmesi yapılması ve çevresel etkilerinin belirlenmesi amaçlanmaktadır. Çalışmada çevresel risk faktörleri belirlenerek, risklerin çevreye olası etkileri L tipi matris metodu ve Fine-Kinney metodu kullanılarak ortaya konulmaya çalışılmıştır. Bu doğrultuda havalimanı bünyesinde yer alan ofis, mutfak, marangozhane, depo, bakım onarım vb. birimlerde çevresel zararlara sebep olabileceği düşünülen çevresel risk etmenleri değerlendirilmiştir. Havalimanında yapılan değerlendirmeler sonucunda L tipi matris metoduyla 11 adet orta, 243 adet katlanılabilir ve 39 adet önemsiz düzey risk tespit edilmişken, Fine-Kinney metoduyla 7 adet yüksek, 31 adet önemli, 136 olası ve 119 adet önemsiz düzey çevresel risk tespit edilmiştir. Alınacak önlemlerin, havalimanının muhtemel çevresel etkilerini büyük ölçüde düşüreceğini göstermektedir.

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  AtıfOpenAlex2·TR Dizin2

  İncele
• MakaleAçık Erişim2024Scopus SJRQ1/r/bayburt/12888
  Removal kinetics of vinyl acetate under aerobic and anoxic conditions in a batch bioreactor

  Yalçın Çelik, Beste; Nuhoğlu, Alper; Kul, Sinan; İrdemez, Şahset

  Vinyl acetate is a volatile organic compound widely used in the chemical industry, and there is a need for effective and economic removal of this volatile organic compound from wastewater and waste gases in chemical industries. This study aims to determine the biological treatability of vinyl acetate both under aerobic and anoxic conditions using mixed cultures obtained from a wastewater treatment plant. Considering the previous studies in the literature, testing the biodegradability of vinyl acetate under both aerobic and anoxic conditions, together with evaluating the effect of other mechanisms, such as adsorption and volatilization, on the removal of vinyl acetate, can be regarded as the prominent part of this study. Wastewater containing artificially prepared vinyl acetate was treated in a batch bioreactor, and performance and kinetic constants were investigated. Aerobic treatment under batch conditions conformed to the Haldane biokinetic equation, and the biokinetic constants of μmax, Ks, and Ki were calculated as 0.66 h−1, 19.67 mg L−1 and 50.56 mg L−1, respectively. Anoxic treatment under batch conditions conformed to the Monod biokinetic equation, and the biokinetic constants of μmax and Ks were calculated as 0.31 h−1 and 33.88 mg L−1, respectively. Experiments revealed that vinyl acetate was not volatile, and its adsorption and biological treatment performances were 28% and 72%, respectively. The mixed culture had a very high performance for removing vinyl acetate under batch operating conditions. The primary mechanism of vinyl acetate removal was found to be biological treatment.

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  AtıfOpenAlex1

  İncele
• MakaleAçık Erişim2023Scopus SJRQ2/r/bayburt/11804
  Investigation of organic and inorganic matters removal from tannery wastewater using iron plate electrode by electrocoagulation process

  Bingül, Züleyha; Irdemez, Şahset; Kul, Sinan; Ekmekyapar Torun, Fatma; Demircioğlu, Nuhi

  In this study, COD, turbidity, total nitrogen, phosphate, sulphate, oil-grease and chromium removals from wastewaters taken from a local tannery using the electrocoagulation process were examined and the most suitable parameters for the electrocoagulation system were tried to be determined. Soluble iron plate electrodes were used as electrodes in the experiments. As a result of the studies carried out, the most suitable initial pH in uncontrolled pH was determined as pH = 4 and for controlled pH as pH = 5. In studies, the most suitable current density for iron electrodes was determined as 1.2 mA cm−2. Even if the increase in current density increased the amount of dissolved Fe, it negatively affected the removal efficiency. In addition, the turbidity of the wastewater was removed in 30 minutes, phosphate in 20 minutes and chromium in 15 minutes by 100%. During 60 minutes of operation, while 62.91% of TN, 87.8% of oil-grease were removed, sulphate was removed at the rate of 54.78%. In the studies, 1st and 2nd order kinetic equations for COD removal were examined and it was determined that removal kinetic is more suitable for 2nd order kinetics.

  AtıfScopus7·WoS4

  İncele
• MakaleAçık Erişim2022/r/bayburt/16640
  Elektrokoagülasyon yöntemi ile demir elektrotlar kullanılarak sulardan fosfat giderimi üzerine destek elektrolit türü ve konsantrasyonunun etkisi

  Kul, Sinan; İrdemez, Şahset; Torun, Fatma Ekmekyapar; Reçber, Züleyha; Demircioğlu, Nuhi

  Bu çalışmada elektrokoagülasyon prosesi kullanılarak atıksuyun iletkenliğini artırmak için suya verilen destek elektrolitin türü ve konsantrasyonunun sulardan fosfat giderimine etkisi araştırılmıştır. Ayrıca elektrolitsiz deneyler yapılmış ve sonuçlar karşılaştırılmıştır. Destek elektrolit tipi ve konsantrasyonunun fosfat giderme verimliliği, enerji tüketimi ve reaksiyon hızı üzerindeki etkisi analiz edilmiştir. Deneyler, elektrolit kullanımının fosfat giderme verimliliği üzerinde önemli bir etkisi olmadığını göstermiştir. Ancak elektrolit ilavesinin enerji tüketimini azalttığı ve uzaklaştırma oranını arttırdığı bulunmuştur. Elde edilen sonuçlardan en uygun elektrolit türü olarak NaCl ve optimum doz olarak 5 mM elektrolitin yeterli olduğu belirlenmiştir. Bu koşullar altında, 0.5 mA cm-2 akım yoğunluğunda 100 mg L^-1 PO_4-P için fosfat giderme verimi %96.98, enerji tüketimi 1.13 kWh m^-3 ve birinci dereceden reaksiyon hızı sabiti 0.0593 dk^-1 olarak elde edilmiştir.

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  AtıfOpenAlex2

  İncele
• MakaleAçık Erişim2022Scopus SJRQ3/r/bayburt/14503
  DETERMINATION OF PARAMETERS AFFECTING KINETIC AND THERMODYNAMIC VALUES FOR LEAD REMOVAL USING WASTEWATER TREATMENT PLANT SEWAGE SLUDGE ASH

  Irdemez, Sahset; Yesilyurt, Duygu; Torun, Fatma Ekmekyapar; Kul, Sinan

  In this study, treatment of lead containing wastewater using sewage sludge ash obtained from the incineration unit in the domestic wastewater treatment plant in Gaziantep province in Turkey was investigated. The main purpose of the study is to determine the potential of using the treatment sludge ash, which comes out as waste in the treatment plant, in the treatment of wastewater of another industry. As a result of this study, the most suitable adsorption conditions were determined and focused on the kinetics of adsorption. In the experiments, the lead adsorption capacity of sewage sludge ash was determined as 122 mg g-1 at 0.5 g L-1 adsorbent concentration in wastewater containing 100 mg L-1 Pb2+under optimum conditions. As a result of the research, it was determined that the adsorption reaction proceeds according to the pseudo second degree reaction and is suitable for the Langmuir isotherm. As thermodynamic constants, & UDelta;H & DEG; = 7.407 kJ mol-1 and & UDelta;S & DEG; = 33.25 J mol-1 were determined. As a result of this, it was determined that the adsorption reaction was endothermic, spontaneous and random, and adsorption was physical adsorption. The results show that sewage sludge ash can be used in the treatment of water containing high concentrations of Pb2+.

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  AtıfWoS3·OpenAlex4

  İncele
• MakaleAçık Erişim2022Scopus SJRQ2/r/bayburt/13438
  The Investigation of COD Treatment and Energy Consumption of Urban Wastewater by a Continuous Electrocoagulation System

  Dede Sağsöz, Yeşim; Yilmaz, Alper Erdem; Ekmekyapar Torun, Fatma; Kocadağistan, Beyhan; Kul, Sinan

  In this study, electrochemical treatment of urban wastewater with electrical conductivity of 1000 µS cm-1 and chemical oxygen demand of 250 mg L-1 was investigated using the variables of initial pH value, current density and flow rate. Electrocoagulation was used, in which aluminum and stainless steel were selected, as the electrochemical treatment process. The electrocoagulation process was operated in continuous mode. The data obtained in experimental studies show that the best COD removal efficiency occurred in experiments where the initial pH value was 6. The increase in current density from 5 A to 15 A decreased the removal efficiency from 79 to 67%. The increase in flow rate under constant current density also reduced the efficiency of removal as expected. In experiments in which current density and flow rate were examined together, the increase in flow rate allowed the application of higher current densities. This situation led to considerable reductions in energy consumption values, even if the COD removal efficiency did not significantly increase. The high COD removal obtained with the use of high flow rate and high current density indicates that the electrocoagulation process can be used for high flow rate municipal wastewater treatment.

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  AtıfScopus6·WoS5·OpenAlex5

  İncele
• MakaleAçık Erişim2022Scopus SJRQ2/r/bayburt/13367
  Investigation of the biological treatability of pistachio processing industry wastewaters in a batch-operated aerobic bioreactor

  Tırınk, Sevtap; Nuhoğlu, Alper; Kul, Sinan

  This study encompasses investigation of treatment of pistachio processing industry wastewaters in a batch reactor under aerobic conditions, calculation of kinetic parameters and comparison of different inhibition models. The mixed microorganism culture used in the study was adapted to pistachio processing industry wastewaters for nearly one month and then concentrations from 50 to 1000 mg L−1 of pistachio processing industry wastewaters were added to the medium and treatment was investigated in batch experiments. The Andrews, Han-Levenspiel, Luong and Aiba biokinetic equations were chosen for the correlations between the concentration of pistachio processing industry wastewaters and specific growth rates, and the kinetic parameters in these biokinetic equations were calculated. The maximum specific growh rate, semi-saturated constant and inhibition constant parameters, included in the Aiba biokinetic equation providing best fit among the other equations, had values calculated as 0.25 h−1, 19 mg L−1, and 516 mg L−1, respectively. The substrate value reaches maximum value and the specific growth rate at this concentration were calculated as 101.379 mg L−1 and 0.1827 h−1, respectively. Graphical abstract: [Figure not available: see fulltext.]

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  AtıfScopus4·WoS4·OpenAlex5

  İncele
• MakaleYalnız künye2022Scopus SJRQ2/r/bayburt/13134
  Investigation of the Treatment of Olive Mill Wastewater by Electrooxidation

  Kul, Sinan; Boncukcuoğlu, Recep; Ekmekyapar Torun, Fatma; Reçber, Züleyha; Sözüdoğru, Onur; Aladağ, Erdinç

  The electrooxidation process, one of the advanced oxidation processes, is one of the effective treatment processes used in treating various industrial wastewaters. This study investigated the treatment of olive mill wastewater using the electrooxidation process. This study includes the effects of different experimental parameters on chemical oxygen demand and total phenol removal efficiencies in olive mill wastewater. Ti/IrO2/RuO2 mesh plates as anode material and Ti mesh plates as cathode material were used in the study. The effects of stirring rate, dilution factor, pH, type of support electrolyte, the concentration of support electrolyte, and current density on chemical oxygen demand and total phenol removal efficiencies were examined in the experiments using a batch reactor. The study found that the chemical oxygen demand and total phenol removal rates were 96.93% and 100% under optimum conditions, respectively. According to the treatment data obtained, it can be said that olive mill wastewater can be treated by the electrooxidation method and can be proposed as a pretreatment system before entering biological treatment.

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  AtıfScopus8·WoS6·OpenAlex8

  İncele
• MakaleAçık Erişim2022Scopus SJRQ3/r/bayburt/12074
  Comparison of Bomaplex Blue CR-L Removal by Adsorption Using Raw and Activated Pumpkin Seed Shells

  Irdemez, Şahset; Özyay, Gizem; Ekmekyapar Torun, Fatma; Kul, Sinan; Bingül, Züleyha

  In this study, removal of colour from wastewaters prepared synthetically using Bomaplex Blue CR-L was investigated using raw and activated pumpkin seed shells by adsorption in a batch system. The effects of stirring speed, adsorbent concentration, dye concentration, temperature and pH on colour removal were investigated, and adsorption capacities of raw and activated pumpkin seed shells were determined. In addition, adsorption kinetics, isotherm coefficients, activation energies and thermodynamic parameters were calculated. The optimal adsorption conditions were determined as pH = 2, stirring speed of 200 rpm, adsorbent concentration of 10 g L-1 and 30 °C. Under the optimal conditions, the maximum removal efficiency of Bomaplex Blue CR-L using raw pumpkin seed shells was 73.01 %. This value rose to 79.71 % after activation processing was applied. Experimental adsorption data show that the adsorption is more suited to the Langmuir adsorption model and works in accordance with the pseudo-first-order kinetics model. As a result of thermodynamic research, ΔH° and ΔS° were 31.515 kJ mol-1 and 109.952 kJ mol-1 K-1 for the raw adsorbent, respectively. For the activated adsorbent, ΔH° and ΔS° were 43.118 kJ mol-1 and 152.237 kJ mol-1 K-1, respectively. The activation energy of adsorption was calculated as 10.918 kJ mol-1 for the raw adsorbent and 9.882 kJ mol-1 for the activated adsorbent.

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  AtıfScopus9·WoS7·OpenAlex9

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