This study used thermal power plant fly ash (FA) and bottom ash (BA) as fill materials and investigated the thermal properties of composites made of cement and pine tree resin binders. For each ash group, 36 samples were prepared by adding 50% cement and 1% to 2% resin as binders. i) FA samples had 23.18%, 22.99%, and 77.01% lower density, thermal conductivity, and compressive strength than BA samples, respectively. FA samples had 9.42% higher porosity than BA samples. ii) FA (0.177 W/mK) and BA (0.221 W/mK) samples with resin and cement had the lowest heat transfer coefficients. iii) FA (14.46 MPa) and BA (36.96 MPa) samples (resin + cement binder) had the highest compressive strength values.
以火电厂粉煤灰(FA)和底灰(BA)为填料，研究了水泥与松木树脂粘结剂复合材料的热性能。每个灰分组分别加入50%的水泥和1% ~ 2%的树脂作为粘结剂制备36个样品。i) FA试样的密度、导热系数和抗压强度分别比BA试样低23.18%、22.99%和77.01%。FA样品的孔隙率比BA样品高9.42%。ii) FA (0.177 W/mK)和BA (0.221 W/mK)树脂和水泥样品的换热系数最低。(3) FA (14.46 MPa)和BA (36.96 MPa)试样(树脂+水泥结合料)的抗压强度值最高。
{"title":"Thermal and mechanical analysis of thermal power plant ashes, cement and resin composites","authors":"A. Biçer","doi":"10.24012/dumf.1213882","DOIUrl":"https://doi.org/10.24012/dumf.1213882","url":null,"abstract":"This study used thermal power plant fly ash (FA) and bottom ash (BA) as fill materials and investigated the thermal properties of composites made of cement and pine tree resin binders. For each ash group, 36 samples were prepared by adding 50% cement and 1% to 2% resin as binders. i) FA samples had 23.18%, 22.99%, and 77.01% lower density, thermal conductivity, and compressive strength than BA samples, respectively. FA samples had 9.42% higher porosity than BA samples. ii) FA (0.177 W/mK) and BA (0.221 W/mK) samples with resin and cement had the lowest heat transfer coefficients. iii) FA (14.46 MPa) and BA (36.96 MPa) samples (resin + cement binder) had the highest compressive strength values.","PeriodicalId":158576,"journal":{"name":"DÜMF Mühendislik Dergisi","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132966565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Recently, the monkeypox disease spreads to many countries rapidly and it becomes a serious health problem. In addition, this disease affects the quality of a person's life. Therefore, it is crucial to decrease the spread rate with the quick determination of the disease. In order to identify monkeypox rapidly, deep learning models are used. They are named EfficientNetB3, ResNet50, and InceptionV3 respectively. According to the results of the three models, ResNet50 is the best model when they compare aspects of performance. The accuracy of ResNet50 sets %94.00. There are four parameters that are used to evaluate the performance of the models. There are called precision, recall, f1-score, and support. These models demonstrate that monkeypox can be classified with high precision. Therefore these models can be used for the future of the work.
{"title":"Utilizing the Ensemble of Deep Learning Approaches to Identify Monkeypox Disease","authors":"Sedat Örenç, Emrullah Acar, M. S. Özerdem","doi":"10.24012/dumf.1199679","DOIUrl":"https://doi.org/10.24012/dumf.1199679","url":null,"abstract":"Recently, the monkeypox disease spreads to many countries rapidly and it becomes a serious health problem. In addition, this disease affects the quality of a person's life. Therefore, it is crucial to decrease the spread rate with the quick determination of the disease. In order to identify monkeypox rapidly, deep learning models are used. They are named EfficientNetB3, ResNet50, and InceptionV3 respectively. According to the results of the three models, ResNet50 is the best model when they compare aspects of performance. The accuracy of ResNet50 sets %94.00. There are four parameters that are used to evaluate the performance of the models. There are called precision, recall, f1-score, and support. These models demonstrate that monkeypox can be classified with high precision. Therefore these models can be used for the future of the work.","PeriodicalId":158576,"journal":{"name":"DÜMF Mühendislik Dergisi","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123363715","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this investigation, the dynamic behaviour of glass fibre reinforced poly- mer under in-plane and out-of-plane dynamic compression tests was studied experimentally and numerically under varying the fibres orientation and the loading conditions. The composites consist of unidirectional E-glass fibers reinforced epoxy polymer composites used in modern helicopter blade application as inner surface. Specimens, with a cylindrical shape, are impacted at a constant strain rate subjected to SHPB and Ls Dyna program. The numerical results are in good agreement with experimental results. The results show that the out-of-plane stress values for different fiber orientation are close to each other, but the in-plane stress value is far lower for the fibers direction of ±45◦. This study will facilitate fiber orientation selection for dynamic effects during the helicopter blade production phase. Not only simple tests but also practical ideas make this study stand out. Considering results, the use of ±90◦ fiber direction in helicopter blades seems to be more advantageous against dynamic effects.
{"title":"Effect of fiber orientation and loading direction on the compressive response of E-glass/Epoxy laminated composites used in modern helicopter blades submitted to high strain rate","authors":"A. Çelik, Y. Arman","doi":"10.24012/dumf.1140112","DOIUrl":"https://doi.org/10.24012/dumf.1140112","url":null,"abstract":"In this investigation, the dynamic behaviour of glass fibre reinforced poly- mer under in-plane and out-of-plane dynamic compression tests was studied experimentally and numerically under varying the fibres orientation and the loading conditions. The composites consist of unidirectional E-glass fibers reinforced epoxy polymer composites used in modern helicopter blade application as inner surface. Specimens, with a cylindrical shape, are impacted at a constant strain rate subjected to SHPB and Ls Dyna program. The numerical results are in good agreement with experimental results. The results show that the out-of-plane stress values for different fiber orientation are close to each other, but the in-plane stress value is far lower for the fibers direction of ±45◦. This study will facilitate fiber orientation selection for dynamic effects during the helicopter blade production phase. Not only simple tests but also practical ideas make this study stand out. Considering results, the use of ±90◦ fiber direction in helicopter blades seems to be more advantageous against dynamic effects.","PeriodicalId":158576,"journal":{"name":"DÜMF Mühendislik Dergisi","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121647988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Accurate estimation of streamflow has an important role in water resources management, disaster preparedness and early warning, reservoir operation, and sizing of water structures. In this study, Extreme gradient boosting (XGBoost) and K-Nearest Neighbours (KNN) algorithms are used for the estimation of streamflow. In order to reveal the appropriate model, the raw model and models with optimized parameters were evaluated while the models were being built. In the setup of the models, various training test rates were also tried, and it was investigated which data division showed more effective results. For this purpose, the data were divided into ratios such as 60-40, 70-30, 80-20, and 90-10, respectively, and the model results were compared. Various statistical indicators such as Root Mean Square Error (RMSE), Mean Absolute Error (MAE), and Coefficient of Determination (R2) were used when comparing the models. As a result of the analysis, it was determined that the most suitable model for monthly streamflow estimation was obtained by using the optimized Xgboost algorithm and 60-40% data division. The obtained outputs constitute a vital resource for decision-makers regarding water resources planning and flood and drought management.
{"title":"Data division effect on machine learning performance for prediction of streamflow","authors":"O. Katipoğlu","doi":"10.24012/dumf.1158748","DOIUrl":"https://doi.org/10.24012/dumf.1158748","url":null,"abstract":"Accurate estimation of streamflow has an important role in water resources management, disaster preparedness and early warning, reservoir operation, and sizing of water structures. In this study, Extreme gradient boosting (XGBoost) and K-Nearest Neighbours (KNN) algorithms are used for the estimation of streamflow. In order to reveal the appropriate model, the raw model and models with optimized parameters were evaluated while the models were being built. In the setup of the models, various training test rates were also tried, and it was investigated which data division showed more effective results. For this purpose, the data were divided into ratios such as 60-40, 70-30, 80-20, and 90-10, respectively, and the model results were compared. Various statistical indicators such as Root Mean Square Error (RMSE), Mean Absolute Error (MAE), and Coefficient of Determination (R2) were used when comparing the models. As a result of the analysis, it was determined that the most suitable model for monthly streamflow estimation was obtained by using the optimized Xgboost algorithm and 60-40% data division. The obtained outputs constitute a vital resource for decision-makers regarding water resources planning and flood and drought management.","PeriodicalId":158576,"journal":{"name":"DÜMF Mühendislik Dergisi","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128561235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this experimental study, nine different lightweight aggregate concrete (LWAC) specimens - in which natural lightweight scoria aggregate was used as coarse aggregate - were prepared for investigating the size of portlandite crystals in their interfacial transition zone (ITZ). Scanning Electron Microscope (SEM) was used to determine the size of portlandite crystals in ITZ of LWAC specimens. The size of portlandite crystals in ITZ of these LWAC specimens was determined quantitatively in order to identify its relation with ratios of ingredients and properties of LWAC that were investigated. It was determined that the size of portlandite crystals in ITZ of nine LWAC specimens is in the range of (0.91-2.047) µm. The size of portlandite crystals in ITZ is found to be increased when the water/cement (W/C) and coarse aggregate/total aggregate (Ac/A) ratios of LWAC get increased. On the other hand, the compressive strength and the oven-dry density of LWAC are found to be decreased when the size of portlandite crystals in ITZ gets increased. The best way to make portlandite beneficial from mechanical, physical and durability points of view is to transform it into so-called secondary hydration products by making it react with materials that have proper chemical properties for this transformation. In this case, the small portlandite crystals dissolve entirely, and the large portlandite crystals become smaller. Lightweight scoria aggregate used in this study is thought to have chemical properties to assist such a transformation in ITZ.
{"title":"The size of portlandite crystals in ITZ and its relation with ratios of ingredients and properties of LWAC","authors":"İ. A. Gönül, H. Ciçek","doi":"10.24012/dumf.1142093","DOIUrl":"https://doi.org/10.24012/dumf.1142093","url":null,"abstract":"In this experimental study, nine different lightweight aggregate concrete (LWAC) specimens - in which natural lightweight scoria aggregate was used as coarse aggregate - were prepared for investigating the size of portlandite crystals in their interfacial transition zone (ITZ). Scanning Electron Microscope (SEM) was used to determine the size of portlandite crystals in ITZ of LWAC specimens. The size of portlandite crystals in ITZ of these LWAC specimens was determined quantitatively in order to identify its relation with ratios of ingredients and properties of LWAC that were investigated. It was determined that the size of portlandite crystals in ITZ of nine LWAC specimens is in the range of (0.91-2.047) µm. The size of portlandite crystals in ITZ is found to be increased when the water/cement (W/C) and coarse aggregate/total aggregate (Ac/A) ratios of LWAC get increased. On the other hand, the compressive strength and the oven-dry density of LWAC are found to be decreased when the size of portlandite crystals in ITZ gets increased. The best way to make portlandite beneficial from mechanical, physical and durability points of view is to transform it into so-called secondary hydration products by making it react with materials that have proper chemical properties for this transformation. In this case, the small portlandite crystals dissolve entirely, and the large portlandite crystals become smaller. Lightweight scoria aggregate used in this study is thought to have chemical properties to assist such a transformation in ITZ.","PeriodicalId":158576,"journal":{"name":"DÜMF Mühendislik Dergisi","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125250731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Antibiotics are a group of drugs widely used as human and veterinary drugs and in aquaculture and agriculture. Recently, parent compounds and their metabolites are constantly excreted and released into environmental matrices, due to the fact that antibiotics cannot be completely metabolized after consumption by humans and animals and cannot be completely removed by conventional wastewater treatment plants. The accumulation and persistence of antibiotics in environmental matrices can lead to harmful effects on ecosystems, even at concentration levels as low as ng/L to μg/L. Rifampicin (RIF), which belongs to the macrocyclic antibiotic class, is the most important antibiotic widely used in the tuberculosis treatment. Lately, the RIF was detected in aquatic environments and needs to be removal effectively. This review considers the current state of knowledge regarding the sources, fate, effects and removal processes of the antibiotic RIF. In this review, the different treatment techniques such as adsorption, advanced oxidation processes (AOPs) and other technologies (membrane process and moving bed biofilm reactor) for RIF removal were evaluated and compared. A comparison between these techniques was made focusing on performance and efficiency. As a result, it was found that adsorption and AOPs were the most studied method and almost all of the studied RIF removal methods were also to be successful.
{"title":"The Application of Different Technologies for Removal of Rifampicin From Aquatic Environments: A Recent Review","authors":"H. Erdem","doi":"10.24012/dumf.1120755","DOIUrl":"https://doi.org/10.24012/dumf.1120755","url":null,"abstract":"Antibiotics are a group of drugs widely used as human and veterinary drugs and in aquaculture and agriculture. Recently, parent compounds and their metabolites are constantly excreted and released into environmental matrices, due to the fact that antibiotics cannot be completely metabolized after consumption by humans and animals and cannot be completely removed by conventional wastewater treatment plants. The accumulation and persistence of antibiotics in environmental matrices can lead to harmful effects on ecosystems, even at concentration levels as low as ng/L to μg/L. Rifampicin (RIF), which belongs to the macrocyclic antibiotic class, is the most important antibiotic widely used in the tuberculosis treatment. Lately, the RIF was detected in aquatic environments and needs to be removal effectively. This review considers the current state of knowledge regarding the sources, fate, effects and removal processes of the antibiotic RIF. In this review, the different treatment techniques such as adsorption, advanced oxidation processes (AOPs) and other technologies (membrane process and moving bed biofilm reactor) for RIF removal were evaluated and compared. A comparison between these techniques was made focusing on performance and efficiency. As a result, it was found that adsorption and AOPs were the most studied method and almost all of the studied RIF removal methods were also to be successful.","PeriodicalId":158576,"journal":{"name":"DÜMF Mühendislik Dergisi","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126513943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Günlük hayatta önemli bir yere sahip olan plastikler, fiziksel bozunmaya uğradıklarında kolaylıkla taşınarak göllere, akarsulara, denizlere, dağlara ve topraklara ulaşmakta ve kirletici olarak tüm doğal ekosistemlere zarar vermektedirler. Mikroplastiklerin özellikle kıyı alanlarında birikimini etkileyen en önemli unsurlardan ilki jeolojik süreçlerden olan karasal ve denizel sedimanların taşınımları ikincisi ise antropojenik etmenlerdir. Muğla kıyı sedimanlarında biriken mikroplastik miktarını belirlemek amacıyla Palamutbükü, Datça, Marmaris ve Akyaka sahil kumlarından alınan örnekler tane boyu bakımından karakterize edilmiş; düşük yoğunluklu mikroplastik ayırma yöntemleri kullanılmıştır. Plastik içeriği sırasıyla; Palamutbükü örneğinde 11 adet meso-makro plastik, 56 adet mikroplastik / 50 g, Datça örneğinde 13 adet meso-makro plastik, 33 adet mikroplastik / 50 g, Marmaris örneğinde 13 adet meso-makro plastik, 143 adet mikroplastik / 50 g, ve Akyaka örneğinde 4 adet meso-makro plastik, 59 adet mikroplastik / 50 g olarak belirlenmiştir. Orta kum boyunda, incelenen örnekler içinde en küçük ortalama tane boyutuna sahip Akyaka sahili örneği meso-makroplastik içeriği en düşük olandır. İnce çakıl ortalama tane boyuyla en kaba ortalama tane boyuna ve en yüksek çakıl yüzdesine sahip Datça örneği ise mikroplastik sayısı en düşük örnektir. Lif ve parça formunda plastik parçalarında Fourier Dönüşümlü Kızıl Ötesi Spektrometresi analizi gerçekleştirilmiştir. Mikroplastiklerin bileşimlerinde selülöz, polietilen ve polipropilen olduğu belirlenmiştir.
{"title":"Kumsal Sedimanlarının Mikroplastik İçeriklerinin ve Sediman Tanelerinin Karakterizasyonu: Muğla Kıyılarından (GB Türkiye) Örnek Çalışma","authors":"Murat Gul, Ceren Küçükuysal, Ahmed Masud","doi":"10.24012/dumf.1212109","DOIUrl":"https://doi.org/10.24012/dumf.1212109","url":null,"abstract":"Günlük hayatta önemli bir yere sahip olan plastikler, fiziksel bozunmaya uğradıklarında kolaylıkla taşınarak göllere, akarsulara, denizlere, dağlara ve topraklara ulaşmakta ve kirletici olarak tüm doğal ekosistemlere zarar vermektedirler. Mikroplastiklerin özellikle kıyı alanlarında birikimini etkileyen en önemli unsurlardan ilki jeolojik süreçlerden olan karasal ve denizel sedimanların taşınımları ikincisi ise antropojenik etmenlerdir. Muğla kıyı sedimanlarında biriken mikroplastik miktarını belirlemek amacıyla Palamutbükü, Datça, Marmaris ve Akyaka sahil kumlarından alınan örnekler tane boyu bakımından karakterize edilmiş; düşük yoğunluklu mikroplastik ayırma yöntemleri kullanılmıştır. Plastik içeriği sırasıyla; Palamutbükü örneğinde 11 adet meso-makro plastik, 56 adet mikroplastik / 50 g, Datça örneğinde 13 adet meso-makro plastik, 33 adet mikroplastik / 50 g, Marmaris örneğinde 13 adet meso-makro plastik, 143 adet mikroplastik / 50 g, ve Akyaka örneğinde 4 adet meso-makro plastik, 59 adet mikroplastik / 50 g olarak belirlenmiştir. Orta kum boyunda, incelenen örnekler içinde en küçük ortalama tane boyutuna sahip Akyaka sahili örneği meso-makroplastik içeriği en düşük olandır. İnce çakıl ortalama tane boyuyla en kaba ortalama tane boyuna ve en yüksek çakıl yüzdesine sahip Datça örneği ise mikroplastik sayısı en düşük örnektir. Lif ve parça formunda plastik parçalarında Fourier Dönüşümlü Kızıl Ötesi Spektrometresi analizi gerçekleştirilmiştir. Mikroplastiklerin bileşimlerinde selülöz, polietilen ve polipropilen olduğu belirlenmiştir.","PeriodicalId":158576,"journal":{"name":"DÜMF Mühendislik Dergisi","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121512532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yüksek maliyetli otomatik seri üretim makinelerinin sabit hız gerektiren işlemlerinde DC motor ile tahrik edilen dört çubuk mekanizmaları yaygın olarak kullanılmaktadır. Sabit hızlı mekanizmaların tasarımları zor olmalarının yanında farklı hız talepleri durumunda mekanizmanın boyutlarının değişmesi gerekmektedir. Alternatif olarak mekanizmayı tahrik eden motor hızı kontrol edilerek bu talep gerçekleştirilebilmektedir. Bu çalışmada dört çubuk mekanizmasında biyel üzerindeki bir noktanın sabit bir hız ile yörüngesi üzerinde ilerleyebilmesi problemi göz önüne alınmıştır. Bu amaçla krank hızı istenilen yörünge takip hızını sağlayacak şekilde kontrol edilmiştir. Matlab Simscape aracından faydalanılmış ve krank hızının kontrolünde PID algoritması kullanılmıştır. Örnek bir mekanizma için sayısal benzetim çalışmaları yapılmış ve başarılı sonuçlar elde edilmiştir.
{"title":"Sabit Hız İle Yörünge Takibi Sağlayan Dört Çubuk Mekanizmasının Hız Kontrolü","authors":"Halit Hülako, Orhan Çakar","doi":"10.24012/dumf.1173407","DOIUrl":"https://doi.org/10.24012/dumf.1173407","url":null,"abstract":"Yüksek maliyetli otomatik seri üretim makinelerinin sabit hız gerektiren işlemlerinde DC motor ile tahrik edilen dört çubuk mekanizmaları yaygın olarak kullanılmaktadır. Sabit hızlı mekanizmaların tasarımları zor olmalarının yanında farklı hız talepleri durumunda mekanizmanın boyutlarının değişmesi gerekmektedir. Alternatif olarak mekanizmayı tahrik eden motor hızı kontrol edilerek bu talep gerçekleştirilebilmektedir. Bu çalışmada dört çubuk mekanizmasında biyel üzerindeki bir noktanın sabit bir hız ile yörüngesi üzerinde ilerleyebilmesi problemi göz önüne alınmıştır. Bu amaçla krank hızı istenilen yörünge takip hızını sağlayacak şekilde kontrol edilmiştir. Matlab Simscape aracından faydalanılmış ve krank hızının kontrolünde PID algoritması kullanılmıştır. Örnek bir mekanizma için sayısal benzetim çalışmaları yapılmış ve başarılı sonuçlar elde edilmiştir.","PeriodicalId":158576,"journal":{"name":"DÜMF Mühendislik Dergisi","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116405311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Su gücü(Hydropower) endüstrisinde su kaynaklarının gelişimi bakımından son 60 yılda özellikle son 30 yılda büyük ilerleme ve yenilikler ortaya çıkmış, buna paralel dünyada büyük hidroelektrik projeler inşa edilmiştir. Hidroelektrik güç üretilen büyük ve kompleks yapıların karakteristikleri başlıca; baraj tasarım yükü yüksekliği, büyük deşarj, birim genişlikteki deşarj kapasitesi ve karmaşık jeolojik koşullardır. Üretilen güç miktarı onlarca veya yüzlerce gigawatt kadar yüksek olabilen bu derece yüksek güç üreten potansiyel enerjiyi dağıtmak, sönümlemek baraj mühendisliğinin elbette zor olan konularındandır. Dolayısıyla baraj mühendisliğinin araştırma konularından olan barajların deşarj yapılarının hidrolik karakteristikleri ve ortaya çıkan enerjinin güvenli ve ekonomik olarak dağıtımının sağlanması hususu dikkate alındığında etkin bir proje tasarımı için yapılacak fiziksel modelleme, prototip deneyleri ve sayısal modelleme sonuçlarının birlikte değerlendirilmesi gerekmektedir. Bu çalışmada yapılan fiziksel model çalışmalarıyla belirlenen deşarj yapılarındaki hidrolik karakteristikler ve enerji kırıcı yapıların etkinliği Hesaplamalı Akışkanlar Dinamiği (HAD) yöntemi ile sayısal olarak incelenmiştir. Çalışmanın sayısal modellemesinde özellikle açık kanal akımı, sediment taşınımı, oyulma gibi problemlerin çözümünde başarılı bir yazılım olan Flow3D kullanılmış olup sayısal hesaplamalardan elde edilen su yüzü, basınç değerleri ve hız profilleri model ölçeğiyle (1/100) yapılan fiziksel model deney ölçümleriyle karşılaştırılmıştır.
{"title":"Barajların deşarj yapılarındaki akış karakteristikleri ve enerji kırıcı yapıların etkinliğinin sayısal analizi","authors":"Selman Oğraş, Fevzi Önen","doi":"10.24012/dumf.1184570","DOIUrl":"https://doi.org/10.24012/dumf.1184570","url":null,"abstract":"Su gücü(Hydropower) endüstrisinde su kaynaklarının gelişimi bakımından son 60 yılda özellikle son 30 yılda büyük ilerleme ve yenilikler ortaya çıkmış, buna paralel dünyada büyük hidroelektrik projeler inşa edilmiştir. Hidroelektrik güç üretilen büyük ve kompleks yapıların karakteristikleri başlıca; baraj tasarım yükü yüksekliği, büyük deşarj, birim genişlikteki deşarj kapasitesi ve karmaşık jeolojik koşullardır. Üretilen güç miktarı onlarca veya yüzlerce gigawatt kadar yüksek olabilen bu derece yüksek güç üreten potansiyel enerjiyi dağıtmak, sönümlemek baraj mühendisliğinin elbette zor olan konularındandır. Dolayısıyla baraj mühendisliğinin araştırma konularından olan barajların deşarj yapılarının hidrolik karakteristikleri ve ortaya çıkan enerjinin güvenli ve ekonomik olarak dağıtımının sağlanması hususu dikkate alındığında etkin bir proje tasarımı için yapılacak fiziksel modelleme, prototip deneyleri ve sayısal modelleme sonuçlarının birlikte değerlendirilmesi gerekmektedir. Bu çalışmada yapılan fiziksel model çalışmalarıyla belirlenen deşarj yapılarındaki hidrolik karakteristikler ve enerji kırıcı yapıların etkinliği Hesaplamalı Akışkanlar Dinamiği (HAD) yöntemi ile sayısal olarak incelenmiştir. Çalışmanın sayısal modellemesinde özellikle açık kanal akımı, sediment taşınımı, oyulma gibi problemlerin çözümünde başarılı bir yazılım olan Flow3D kullanılmış olup sayısal hesaplamalardan elde edilen su yüzü, basınç değerleri ve hız profilleri model ölçeğiyle (1/100) yapılan fiziksel model deney ölçümleriyle karşılaştırılmıştır.","PeriodicalId":158576,"journal":{"name":"DÜMF Mühendislik Dergisi","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124669403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Dementia is an age-related neurological disease and gives rise to profound cognitive decline in patients’ life. Alzheimer’s Disease (AD) is the progression of dementia and AD patients generally have memory loss and behavioral disorders. It is possible to determine the stage of dementia by developing automated systems via. signals obtained from patients. EEG is a popular brain monitoring system due to its cost effective, non-invasive implementation, and higher time resolution. In current study, we include participants of 24 HC (12 eyes open (EO), 12 eyes closed (EC)), and 24 AD (HC (12 eyes open (EO), 12 eyes closed (EC)). The aim of current study is to design a practical AD detection tool for AD/HC participants with a model called DWT-CNN. We performed Discrete Wavelet Transform (DWT) to extract EEG sub-bands. A Conv2D architecture is applied to raw samples of related EEG sub-bands. According to obtained performance metrics calculated from confusion matrices, all AD and HC time series are correctly classified for alpha band and full band range under both EO and EC. Classification rate of AD vs. HC increases under EO state in all cases even if EC is commonly preferred in other studies. We will add MCI patients with equal size and similar demographics and repeat the experimental steps to develop early alert system in future studies. Adding more participants will also increase generalization ability of method. It is also promising study to combine EEG with different modalities (2D TF image conversion, or MRI) in a multimodal approach.
{"title":"Automated Detection of Alzheimer’s Disease using raw EEG time series via. DWT-CNN model","authors":"Mesut Seker, M. S. Özerdem","doi":"10.24012/dumf.1197722","DOIUrl":"https://doi.org/10.24012/dumf.1197722","url":null,"abstract":"Dementia is an age-related neurological disease and gives rise to profound cognitive decline in patients’ life. Alzheimer’s Disease (AD) is the progression of dementia and AD patients generally have memory loss and behavioral disorders. It is possible to determine the stage of dementia by developing automated systems via. signals obtained from patients. EEG is a popular brain monitoring system due to its cost effective, non-invasive implementation, and higher time resolution. In current study, we include participants of 24 HC (12 eyes open (EO), 12 eyes closed (EC)), and 24 AD (HC (12 eyes open (EO), 12 eyes closed (EC)). The aim of current study is to design a practical AD detection tool for AD/HC participants with a model called DWT-CNN. We performed Discrete Wavelet Transform (DWT) to extract EEG sub-bands. A Conv2D architecture is applied to raw samples of related EEG sub-bands. According to obtained performance metrics calculated from confusion matrices, all AD and HC time series are correctly classified for alpha band and full band range under both EO and EC. Classification rate of AD vs. HC increases under EO state in all cases even if EC is commonly preferred in other studies. We will add MCI patients with equal size and similar demographics and repeat the experimental steps to develop early alert system in future studies. Adding more participants will also increase generalization ability of method. It is also promising study to combine EEG with different modalities (2D TF image conversion, or MRI) in a multimodal approach.","PeriodicalId":158576,"journal":{"name":"DÜMF Mühendislik Dergisi","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127898998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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