Pub Date : 2023-10-15DOI: 10.34248/bsengineering.1340985
Hümeyra GÜL, Ece AVULOĞLU YILMAZ
Analgesics are one of the most widely used drug groups in the world. Since the genotoxic and carcinogenic effects of some analgesic drugs have been detected, studies investigating these effects have increased. In this study, the genotoxic effects of the analgesic drugs Tenoxicam and Piroxicam were investigated in vitro in human peripheral lymphocytes by chromosomal aberrations (CAs) and micronucleus (MN) assays. In addition, mitotic index (MI) and nuclear division index (NDI) values were also determined. As a result, no difference in chromosomal abnormalities was observed in both 24 and 48 hours of Piroxicam treatment. Micronucleus frequency was increased at the three highest concentrations (0.94, 1.88 and 3.75 µg/mL) compared to the control. Piroxicam significantly decreased MI compared to both control and solvent control at concentrations of 1.88 and 3.75 µg/mL at all exposure times. Tenoxicam showed a statistically significant increase at the highest concentration (10 μg/mL) compared to the control in the 24 h CA treatment. On the other hand, no effect was observed in 48-hour CA treatment. It was concluded that tenoxicam did not cause a toxic effect at any concentration except the highest concentration (10 μg/mL) in the MN assay results. Mitotic index (MI) significantly decreased at concentrations of 1.25, 2.5, 5 and 10 μg/mL. Nuclear division index (NDI) results did not change for both agents. In conclusion, both agents were found to be genotoxic only at high concentrations and the effect was weak. This study is pioneering as there have been no previous in vitro studies in human peripheral lymphocytes for both Piroxicam and Tenoxicam. These results need to be supported by different cell groups and in vivo assays.
{"title":"Investigation of the Genotoxic Effects of the Analgesic Drugs Piroxicam and Tenoxicam in Human Lymphocytes","authors":"Hümeyra GÜL, Ece AVULOĞLU YILMAZ","doi":"10.34248/bsengineering.1340985","DOIUrl":"https://doi.org/10.34248/bsengineering.1340985","url":null,"abstract":"Analgesics are one of the most widely used drug groups in the world. Since the genotoxic and carcinogenic effects of some analgesic drugs have been detected, studies investigating these effects have increased. In this study, the genotoxic effects of the analgesic drugs Tenoxicam and Piroxicam were investigated in vitro in human peripheral lymphocytes by chromosomal aberrations (CAs) and micronucleus (MN) assays. In addition, mitotic index (MI) and nuclear division index (NDI) values were also determined. As a result, no difference in chromosomal abnormalities was observed in both 24 and 48 hours of Piroxicam treatment. Micronucleus frequency was increased at the three highest concentrations (0.94, 1.88 and 3.75 µg/mL) compared to the control. Piroxicam significantly decreased MI compared to both control and solvent control at concentrations of 1.88 and 3.75 µg/mL at all exposure times. Tenoxicam showed a statistically significant increase at the highest concentration (10 μg/mL) compared to the control in the 24 h CA treatment. On the other hand, no effect was observed in 48-hour CA treatment. It was concluded that tenoxicam did not cause a toxic effect at any concentration except the highest concentration (10 μg/mL) in the MN assay results. Mitotic index (MI) significantly decreased at concentrations of 1.25, 2.5, 5 and 10 μg/mL. Nuclear division index (NDI) results did not change for both agents. In conclusion, both agents were found to be genotoxic only at high concentrations and the effect was weak. This study is pioneering as there have been no previous in vitro studies in human peripheral lymphocytes for both Piroxicam and Tenoxicam. These results need to be supported by different cell groups and in vivo assays.","PeriodicalId":495872,"journal":{"name":"Black sea journal of engineering and science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136183338","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}
Pub Date : 2023-10-15DOI: 10.34248/bsengineering.1355194
Ahmet Rıdvan TOPKARA, Kamil IŞIK
The main purpose of this study is to investigate the microbial diversity of Actinobacteria, living in soils in the “Marmara” and “Avşa” Islands and to identify species at genus level based on 16S rRNA gene sequences. These islands are located in the southwest of the Sea of Marmara and in the literature review, no Actinobacteria biodiversity studies related to Marmara and Avşa Islands were found. Such unexplored ecological habitats are potentially rich source for discovery sources of novel species and bioactive molecule. Actinobacteria play an important role in many natural phenomena such as nitrogen fixation, roles of these prokaryotic microorganisms. In this article, we focused on the presence and the diversity of Actinobacteria on the Islands by examining multiple sampling sites and using different selective isolation media. A total of 400 culturable Actinobacteria were isolated using ten different isolation media by dilution-plating method. Among the 400 isolates, 112 isolates were selected according to their morphology in different culture media. The isolates were characterized on the basis of 16S ribosomal RNA gene sequencing and phylogenetic analysis. The results showed a high level of actinobacterial diversity with 16 different genera. These genera obtained as a result of phylogenetic analyzes are Streptomyces, Nonomuraea, Nocardia, Actinomadura, Micromonospora, Kribbella, Mycolicibacterium, Microbispora, Saccharopolyspora, Jiangella, Rhodococcus, Actinopolymorpha, Geodermatophilus, Dactylosporangium, Pseudonocardia and Nocardioides. Many isolates are identified as new species by our current research. Findings from this study showed that the soil of Marmara and Avşa Islands can be a good source of isolation for Actinobacteria.
{"title":"Biodiversity of Actinobacteria Isolated from Marmara and Avşa Islands in Türkiye","authors":"Ahmet Rıdvan TOPKARA, Kamil IŞIK","doi":"10.34248/bsengineering.1355194","DOIUrl":"https://doi.org/10.34248/bsengineering.1355194","url":null,"abstract":"The main purpose of this study is to investigate the microbial diversity of Actinobacteria, living in soils in the “Marmara” and “Avşa” Islands and to identify species at genus level based on 16S rRNA gene sequences. These islands are located in the southwest of the Sea of Marmara and in the literature review, no Actinobacteria biodiversity studies related to Marmara and Avşa Islands were found. Such unexplored ecological habitats are potentially rich source for discovery sources of novel species and bioactive molecule. Actinobacteria play an important role in many natural phenomena such as nitrogen fixation, roles of these prokaryotic microorganisms. In this article, we focused on the presence and the diversity of Actinobacteria on the Islands by examining multiple sampling sites and using different selective isolation media. A total of 400 culturable Actinobacteria were isolated using ten different isolation media by dilution-plating method. Among the 400 isolates, 112 isolates were selected according to their morphology in different culture media. The isolates were characterized on the basis of 16S ribosomal RNA gene sequencing and phylogenetic analysis. The results showed a high level of actinobacterial diversity with 16 different genera. These genera obtained as a result of phylogenetic analyzes are Streptomyces, Nonomuraea, Nocardia, Actinomadura, Micromonospora, Kribbella, Mycolicibacterium, Microbispora, Saccharopolyspora, Jiangella, Rhodococcus, Actinopolymorpha, Geodermatophilus, Dactylosporangium, Pseudonocardia and Nocardioides. Many isolates are identified as new species by our current research. Findings from this study showed that the soil of Marmara and Avşa Islands can be a good source of isolation for Actinobacteria.","PeriodicalId":495872,"journal":{"name":"Black sea journal of engineering and science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136183508","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}
Pub Date : 2023-10-15DOI: 10.34248/bsengineering.1357067
Dilek KANDEMİR, Kübra PALA, Güldane Tuğba ŞAHİN, Ahmet BALKAYA
Lahanagil sebze türleri kışlık sebzeler içerisinde önemli bir yere sahiptir. Olumsuz çevre koşulları bu sebze türlerinde büyüme ve gelişmeyi olumsuz düzeyde etkileyebilmekte ve verim unsurlarında önemli azalışlara neden olmaktadır. Bu araştırmada, bazı lahanagil türlerine ait çeşitlerde fide dikiminden itibaren belirli aralıklarla yapılan kantitatif analizlerle vejetatif büyüme özellikleri yönünden karşılaştırılması ve ortaya çıkan farklılıkların fizyolojik parametrelerle incelenmesi amaçlanmıştır. Çalışmada, brokoli, karnabahar, Brüksel lahana, yaprak lahana, beyaz baş lahana ve kırmızı baş lahana türleri kullanılmıştır. Fide dikim tarihini takiben 45. güne kadar 15 gün aralıklı yapılan kantitatif analizlerde yaprak sayısı (adet/bitki), gövde çapı (mm), bitki boyu (cm), toprak üstü aksam yaş ve kuru ağırlığı (g), kök yaş ve kuru ağırlığı (g), bitki yaş ağırlık kuru ağırlığı (g) değerleri belirlenmiştir. Ayrıca, oransal toprak üstü aksam ağırlığı ve oransal kök ağırlığı değerleri de incelenmiştir. Araştırma sonucunda fide dikiminden itibaren 45. günde yapılan kantitatif analiz sonucunda lahanagil türlerinin vejetatif büyüme özellikleri yönünden önemli düzeyde farklılıklar gösterdiği tespit edilmiştir. Lahana grubu sebze türlerinde yaprak sayısı 11-14 adet/bitki arasında değişim göstermiş ve baş lahanaların yaprak sayısının diğer türlere oranla daha fazla olduğu belirlenmiştir. Bitki boyu değerleri 36 - 47 cm aralıklarında dağılım göstermiş ve en yüksek brokoli türünde ölçülmüştür. Toprak üstü aksamı kuru ağırlık değeri 7.31-10.31 g arasında değişim göstermiştir. Araştırmada kök kuru ağırlık değerleri 0.80-1.73 g değerleri arasında dağılış göstermiş ve en yüksek kök kuru ağırlık değerleri sırasıyla yaprak lahana ve Brüksel lahanasında tespit edilmiştir. Oransal kök ağırlığının 0.09-0.14 arasında değiştiği saptanmıştır. Araştırma sonuçlarının, simülasyon çalışmaları ile gelecekte diğer farklı kışlık çeşitlerde kullanımı ve üretim planlanmasında faydalı olacağı öngörülmektedir.
{"title":"Investigation of Vegetative Growth Characteristics of Some Vegetable Species in Brassicaceae Family","authors":"Dilek KANDEMİR, Kübra PALA, Güldane Tuğba ŞAHİN, Ahmet BALKAYA","doi":"10.34248/bsengineering.1357067","DOIUrl":"https://doi.org/10.34248/bsengineering.1357067","url":null,"abstract":"Lahanagil sebze türleri kışlık sebzeler içerisinde önemli bir yere sahiptir. Olumsuz çevre koşulları bu sebze türlerinde büyüme ve gelişmeyi olumsuz düzeyde etkileyebilmekte ve verim unsurlarında önemli azalışlara neden olmaktadır. Bu araştırmada, bazı lahanagil türlerine ait çeşitlerde fide dikiminden itibaren belirli aralıklarla yapılan kantitatif analizlerle vejetatif büyüme özellikleri yönünden karşılaştırılması ve ortaya çıkan farklılıkların fizyolojik parametrelerle incelenmesi amaçlanmıştır. Çalışmada, brokoli, karnabahar, Brüksel lahana, yaprak lahana, beyaz baş lahana ve kırmızı baş lahana türleri kullanılmıştır. Fide dikim tarihini takiben 45. güne kadar 15 gün aralıklı yapılan kantitatif analizlerde yaprak sayısı (adet/bitki), gövde çapı (mm), bitki boyu (cm), toprak üstü aksam yaş ve kuru ağırlığı (g), kök yaş ve kuru ağırlığı (g), bitki yaş ağırlık kuru ağırlığı (g) değerleri belirlenmiştir. Ayrıca, oransal toprak üstü aksam ağırlığı ve oransal kök ağırlığı değerleri de incelenmiştir. Araştırma sonucunda fide dikiminden itibaren 45. günde yapılan kantitatif analiz sonucunda lahanagil türlerinin vejetatif büyüme özellikleri yönünden önemli düzeyde farklılıklar gösterdiği tespit edilmiştir. Lahana grubu sebze türlerinde yaprak sayısı 11-14 adet/bitki arasında değişim göstermiş ve baş lahanaların yaprak sayısının diğer türlere oranla daha fazla olduğu belirlenmiştir. Bitki boyu değerleri 36 - 47 cm aralıklarında dağılım göstermiş ve en yüksek brokoli türünde ölçülmüştür. Toprak üstü aksamı kuru ağırlık değeri 7.31-10.31 g arasında değişim göstermiştir. Araştırmada kök kuru ağırlık değerleri 0.80-1.73 g değerleri arasında dağılış göstermiş ve en yüksek kök kuru ağırlık değerleri sırasıyla yaprak lahana ve Brüksel lahanasında tespit edilmiştir. Oransal kök ağırlığının 0.09-0.14 arasında değiştiği saptanmıştır. Araştırma sonuçlarının, simülasyon çalışmaları ile gelecekte diğer farklı kışlık çeşitlerde kullanımı ve üretim planlanmasında faydalı olacağı öngörülmektedir.","PeriodicalId":495872,"journal":{"name":"Black sea journal of engineering and science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136183168","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}
Pub Date : 2023-10-15DOI: 10.34248/bsengineering.1352976
M. Alp FURAN
Understanding genetic relationships and diversity among species is crucial for unraveling evolutionary processes, ecological interactions, and conservation strategies. DNA sequence analysis serves as a powerful tool in this endeavor. This study focuses on the Thymus genus, a collection of notable species, to investigate its genetic framework. Leveraging DNA sequences from key regions (matK, rbcL, and psbA-trnH), we aim to elucidate genetic connections within the Thymus genus and uncover mechanisms driving its diversity. The Thymus genus, with its diverse species and ecological characteristics, provides a captivating platform for genetic exploration. Through DNA sequence analysis, we aim to unveil genetic interconnections, biodiversity patterns, and the factors shaping the genus's evolution. Our findings are aligned with previous studies, and this consistency highlights the presence of polymorphism within potential sequences. Employing coding loci and spacer regions, our study contributes to Lamiaceae family barcoding research. Despite variations across gene regions, the concatenation of sequences enhances result reliability. We analyzed the suitability of matK, rbcL, and psbA sequences for Thymus identification, observing rbcL and psbA outperforming matK. Our novel approach, rooted in chloroplast DNA, presents a promising method for species discernment. By analyzing multiple chloroplast gene regions, this technique offers a fresh perspective on genetic affinity assessment using DNA barcodes. In conclusion, this study not only contributes to Thymus germplasm resource preservation but also exemplifies a novel approach to discerning Thymus species through DNA analysis. This methodology carries the potential for broader application, enriching our understanding of genetic relationships and diversity in the plant kingdom.
{"title":"Elevating Thyme Species Identification: Exploiting Key Chloroplast Genes (matK, rbcL, and psbA-trnH) through DNA Barcoding and Phylogenetic Analysis","authors":"M. Alp FURAN","doi":"10.34248/bsengineering.1352976","DOIUrl":"https://doi.org/10.34248/bsengineering.1352976","url":null,"abstract":"Understanding genetic relationships and diversity among species is crucial for unraveling evolutionary processes, ecological interactions, and conservation strategies. DNA sequence analysis serves as a powerful tool in this endeavor. This study focuses on the Thymus genus, a collection of notable species, to investigate its genetic framework. Leveraging DNA sequences from key regions (matK, rbcL, and psbA-trnH), we aim to elucidate genetic connections within the Thymus genus and uncover mechanisms driving its diversity. The Thymus genus, with its diverse species and ecological characteristics, provides a captivating platform for genetic exploration. Through DNA sequence analysis, we aim to unveil genetic interconnections, biodiversity patterns, and the factors shaping the genus's evolution. Our findings are aligned with previous studies, and this consistency highlights the presence of polymorphism within potential sequences. Employing coding loci and spacer regions, our study contributes to Lamiaceae family barcoding research. Despite variations across gene regions, the concatenation of sequences enhances result reliability. We analyzed the suitability of matK, rbcL, and psbA sequences for Thymus identification, observing rbcL and psbA outperforming matK. Our novel approach, rooted in chloroplast DNA, presents a promising method for species discernment. By analyzing multiple chloroplast gene regions, this technique offers a fresh perspective on genetic affinity assessment using DNA barcodes. In conclusion, this study not only contributes to Thymus germplasm resource preservation but also exemplifies a novel approach to discerning Thymus species through DNA analysis. This methodology carries the potential for broader application, enriching our understanding of genetic relationships and diversity in the plant kingdom.","PeriodicalId":495872,"journal":{"name":"Black sea journal of engineering and science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136183333","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}
Pub Date : 2023-10-15DOI: 10.34248/bsengineering.1352585
Hayrettin KARADÖL, Mehmet GÖK, Mehmet TEKEREK
Orman işletmelerinde sürekli ve rasyonel bir çalışma gerçekleştirebilmek için ağaçların odun hacim ve artım miktarının periyodik olarak belirlenmesi önemlidir. Ağaçlardan elde edilecek materyallerin farklı kullanım amaçları için ağaçların odun hacimlerini belirlemede ağaç gövde çapının hassas bir şekilde ölçülmesi gerekmektedir. Ağaç gövde çapları çoğunlukla manuel olarak kumpaslarla ölçülmektedir. Bu işlem sürecinde bir orman işçisi kumpasla ağacın gövde çapını ölçmekte ve başka bir işçi ise bu ölçüm bilgisini dikili ağaç ölçüm tutanağına kaydetmekte ve daha sonra analiz için bu veriler bilgisayar ortamına aktarılmaktadır. Tüm bu süreçler zaman, iş gücü ve ölçüm hataları gibi sorunları da beraberinde getirmektedir. Bu çalışmada, ağaç gövde çaplarını ölçebilmek amacıyla derinlik bilgisi içeren bir kamera, tek kart bilgisayar ve diğer çevre birimlerden oluşan düşük maliyetli taşınabilir bir ölçüm sisteminin tasarımı ortaya konmuş ve ön testleri gerçekleştirmek amacıyla deneysel bir sistem oluşturulmuştur. Hedef plan doğrultusunda oluşturulan görüntüleme sistemi ile bazı ön testler gerçekleştirilmiştir. Derinlik bilgisi içeren görüntülerde, hedeflenen bir ağaç gövdesinin dış aydınlatma ortamından etkilenmeksizin ön plana çıkarabiliyor olması, ağaç gövde çapının hassas bir şekilde belirlenmesini sağlamaktadır. Kamera sensörü-ağaç gövdesi arası mesafe belirli bir sınır değer içerisinde (20-100cm) olması koşuluyla 15 farklı ölçüm gerçekleştirilmiş ve manuel kumpas ölçümüne göre ağaç gövde çapları maksimum 1.975 cm hata değeri ile belirlenmiştir.
{"title":"3 Boyutlu görüntüleme kullanılarak bir ağaç gövde çap ölçüm uygulamasının geliştirilmesi","authors":"Hayrettin KARADÖL, Mehmet GÖK, Mehmet TEKEREK","doi":"10.34248/bsengineering.1352585","DOIUrl":"https://doi.org/10.34248/bsengineering.1352585","url":null,"abstract":"Orman işletmelerinde sürekli ve rasyonel bir çalışma gerçekleştirebilmek için ağaçların odun hacim ve artım miktarının periyodik olarak belirlenmesi önemlidir. Ağaçlardan elde edilecek materyallerin farklı kullanım amaçları için ağaçların odun hacimlerini belirlemede ağaç gövde çapının hassas bir şekilde ölçülmesi gerekmektedir. Ağaç gövde çapları çoğunlukla manuel olarak kumpaslarla ölçülmektedir. Bu işlem sürecinde bir orman işçisi kumpasla ağacın gövde çapını ölçmekte ve başka bir işçi ise bu ölçüm bilgisini dikili ağaç ölçüm tutanağına kaydetmekte ve daha sonra analiz için bu veriler bilgisayar ortamına aktarılmaktadır. Tüm bu süreçler zaman, iş gücü ve ölçüm hataları gibi sorunları da beraberinde getirmektedir. Bu çalışmada, ağaç gövde çaplarını ölçebilmek amacıyla derinlik bilgisi içeren bir kamera, tek kart bilgisayar ve diğer çevre birimlerden oluşan düşük maliyetli taşınabilir bir ölçüm sisteminin tasarımı ortaya konmuş ve ön testleri gerçekleştirmek amacıyla deneysel bir sistem oluşturulmuştur. Hedef plan doğrultusunda oluşturulan görüntüleme sistemi ile bazı ön testler gerçekleştirilmiştir. Derinlik bilgisi içeren görüntülerde, hedeflenen bir ağaç gövdesinin dış aydınlatma ortamından etkilenmeksizin ön plana çıkarabiliyor olması, ağaç gövde çapının hassas bir şekilde belirlenmesini sağlamaktadır. Kamera sensörü-ağaç gövdesi arası mesafe belirli bir sınır değer içerisinde (20-100cm) olması koşuluyla 15 farklı ölçüm gerçekleştirilmiş ve manuel kumpas ölçümüne göre ağaç gövde çapları maksimum 1.975 cm hata değeri ile belirlenmiştir.","PeriodicalId":495872,"journal":{"name":"Black sea journal of engineering and science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136183334","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}
Pub Date : 2023-10-15DOI: 10.34248/bsengineering.1338995
Fadıl KUYUCUOĞLU
In this study, numerical analysis of scattering from a dielectric-coated metallic reflector is presented. The reflector has a parabolic cross-sectional cylindrical geometry. Radiation patterns and aperture efficiency parameters are analyzed using physical optics. A complex source point located at the focal point of the parabolic reflector is used as the source of radiation. The dielectric-coated metallic reflector is considered as an antenna, and an impedance boundary is utilized. The effects of coating on radiation patterns are analyzed in terms of dielectric thickness and dielectric permittivity. Numerical results are presented for various parameters, including dielectric permittivity, dielectric layer thickness, complex source point width, and focal distance.
{"title":"Scattering from Parabolic Cylindrical Reflector Antenna Using Modified Theory of Optics","authors":"Fadıl KUYUCUOĞLU","doi":"10.34248/bsengineering.1338995","DOIUrl":"https://doi.org/10.34248/bsengineering.1338995","url":null,"abstract":"In this study, numerical analysis of scattering from a dielectric-coated metallic reflector is presented. The reflector has a parabolic cross-sectional cylindrical geometry. Radiation patterns and aperture efficiency parameters are analyzed using physical optics. A complex source point located at the focal point of the parabolic reflector is used as the source of radiation. The dielectric-coated metallic reflector is considered as an antenna, and an impedance boundary is utilized. The effects of coating on radiation patterns are analyzed in terms of dielectric thickness and dielectric permittivity. Numerical results are presented for various parameters, including dielectric permittivity, dielectric layer thickness, complex source point width, and focal distance.","PeriodicalId":495872,"journal":{"name":"Black sea journal of engineering and science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136183340","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}
Pub Date : 2023-10-15DOI: 10.34248/bsengineering.1344142
Erdem YILDIRIM
Parametric design allows the use of computers and systems that can make decisions beyond human capacity, such as machine learning, through optimization in design and manufacturing. From this point of view, it is aimed to shape and manufacture the design by minimizing the subjective decisions of the designers by using various algorithmic methods and structural optimization to provide ergonomics in a furniture design. As the subject of the study, a meeting table for 8 people was discussed. In the process, 'artificial intelligence supported inspiration board', 'parametric design', 'human-computer interaction and sensors', 'topology optimization', 'observation in augmented reality' and 'computer-aided manufacturing' techniques were used sequentially. After the assembly was completed, the product obtained was finally evaluated in terms of structure-function relationship.
{"title":"Opti-Waffle: A Technological Furniture Design and Manufacturing Model","authors":"Erdem YILDIRIM","doi":"10.34248/bsengineering.1344142","DOIUrl":"https://doi.org/10.34248/bsengineering.1344142","url":null,"abstract":"Parametric design allows the use of computers and systems that can make decisions beyond human capacity, such as machine learning, through optimization in design and manufacturing. From this point of view, it is aimed to shape and manufacture the design by minimizing the subjective decisions of the designers by using various algorithmic methods and structural optimization to provide ergonomics in a furniture design. As the subject of the study, a meeting table for 8 people was discussed. In the process, 'artificial intelligence supported inspiration board', 'parametric design', 'human-computer interaction and sensors', 'topology optimization', 'observation in augmented reality' and 'computer-aided manufacturing' techniques were used sequentially. After the assembly was completed, the product obtained was finally evaluated in terms of structure-function relationship.","PeriodicalId":495872,"journal":{"name":"Black sea journal of engineering and science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136183341","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}
Pub Date : 2023-10-15DOI: 10.34248/bsengineering.1356036
Adi Omaia FAOURİ, Pelin KASAP
The log-logistic distribution has been widely used in several fields, including engineering, survival analysis, and economics. The method of maximum likelihood estimation is used in this study for estimating the shape and scale parameters for the log-logistic distribution, whereas in the case of the log-logistic distribution, likelihood equations lack explicit solutions. Therefore, problems with solving likelihood equations can be solved by using two highly efficient algorithms, which are the whale optimization algorithm and the Nelder-Mead algorithm, as well as by showing the applicability of this distribution by comparing it with other well-known classical distributions. To demonstrate the performance of each algorithm implemented, an extensive Monte Carlo simulation study has been conducted. The performance of maximum likelihood estimators for each algorithm has been evaluated in terms of mean square error and deficiency criteria. It has been seen that the whale optimization algorithm provides the best estimates for the log-logistic distribution parameters according to the simulation data.
{"title":"Maximum Likelihood Estimation for the Log-Logistic Distribution Using Whale Optimization Algorithm with Applications","authors":"Adi Omaia FAOURİ, Pelin KASAP","doi":"10.34248/bsengineering.1356036","DOIUrl":"https://doi.org/10.34248/bsengineering.1356036","url":null,"abstract":"The log-logistic distribution has been widely used in several fields, including engineering, survival analysis, and economics. The method of maximum likelihood estimation is used in this study for estimating the shape and scale parameters for the log-logistic distribution, whereas in the case of the log-logistic distribution, likelihood equations lack explicit solutions. Therefore, problems with solving likelihood equations can be solved by using two highly efficient algorithms, which are the whale optimization algorithm and the Nelder-Mead algorithm, as well as by showing the applicability of this distribution by comparing it with other well-known classical distributions. To demonstrate the performance of each algorithm implemented, an extensive Monte Carlo simulation study has been conducted. The performance of maximum likelihood estimators for each algorithm has been evaluated in terms of mean square error and deficiency criteria. It has been seen that the whale optimization algorithm provides the best estimates for the log-logistic distribution parameters according to the simulation data.","PeriodicalId":495872,"journal":{"name":"Black sea journal of engineering and science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136184383","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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