Kentsel Dönüşüm Kapsamındaki Betonarme Bir Binanın Performansının Doğrusal Elastik Olmayan Hesap Yöntemiyle Belirlenmesi

Konferans Bildirisi-- İstanbul Teknik Üniversitesi, Teorik ve Uygulamalı Mekanik Türk Milli Komitesi, 2017Conference Paper -- İstanbul Technical University, Theoretical and Applied Mechanical Turkish National Committee, 2017Bu bildiride, kentsel dönüşüm kapsamındaki betonarme bir binanın deprem performansının belirlenmesi amacıyla Deprem Bölgelerinde Yapılan Binalar Hakkında Yönetmelik (DBYBHY) 2007’de verilen elastik olmayan doğrusal hesap yöntemlerinden birisi olan Zaman Tanım Alanında Doğrusal Olmayan Hesap Yöntemi ile yapılan analiz ve sonuçları açıklanmaktadır. Binaların deprem performansının belirlenmesi, uygulanan deprem itkisi altında binada oluşması beklenen hasar durumu ile ilişkilidir. Zaman Tanım Alanında Hesap Yöntemi ile analiz sırasında her bir zaman artımında sistemde meydana gelen plastik şekil değiştirme istemleri ile betonarme elemanların kesit birim şekil değiştirme değerleri bulunarak, taşıyıcı sistem elemanlarının performansı DBYBHY-2007’ye göre belirlenmiştir. Taşıyıcı elemanlarda elde edilen hasar bölgelerine göre binanın hangi performans düzeyinde olduğu saptanmış ve sonuç olarak bu betonarme binanın depreme dayanıklı olup olmadığı belirlenmiştir.In this study, the nonlinear time history analysis, which is one of the nonlinear analysis methods given in Turkish Earthquake Code (TEC-2007) was performed for a reinforced concrete building within the scope of urban regeneration in order to determine the earthquake performance of the building. The evaluation of the earthquake performance of the buildings is related to the expected damage status of the buildings under the applied earthquake loads. The performance of the structural elements was determined according to the TEC-2007 by finding the cross-sectional plastic strain demands of the reinforced concrete members and the plastic curvature demands that occur in the system during the nonlinear time history analysis. The performance level of the building was determined according to the damage levels obtained in the structural elements and as a result it was determined whether or not the building investigated was safe under earthquake loads

Multi-object segmentation using coupled nonparametric shape and relative pose priors

We present a new method for multi-object segmentation in a maximum a posteriori estimation framework. Our method is motivated by the observation that neighboring or coupling objects in images generate configurations and co-dependencies which could potentially aid in segmentation if properly exploited. Our approach employs coupled shape and inter-shape pose priors that are computed using training images in a nonparametric multi-variate kernel density estimation framework. The coupled shape prior is obtained by estimating the joint shape distribution of multiple objects and the inter-shape pose priors are modeled via standard moments. Based on such statistical models, we formulate an optimization problem for segmentation, which we solve by an algorithm based on active contours. Our technique provides significant improvements in the segmentation of weakly contrasted objects in a number of applications. In particular for medical image analysis, we use our method to extract brain Basal Ganglia structures, which are members of a complex multi-object system posing a challenging segmentation problem. We also apply our technique to the problem of handwritten character segmentation. Finally, we use our method to segment cars in urban scenes

Strengths and weaknesses of inviting men to a voluntary-based domestic violence intervention

This study examines the factors motivating domestic violence perpetrators to participate in a voluntary-based intervention program. The experiences and determining factors around men’s positive and negative responses to this invitation were examined through semi-structured interviews with professionals, observations, and reflexive notes during the first meeting with 29 men. Two major themes emerged from the thematic analysis: the factors making men more likely to attend the first meeting or resisting the group intervention. These findings can help professionals recognize the challenges of inviting perpetrators to interventions, especially in countries with insufficient laws for mandated domestic violence perpetrator programs. The paper discusses the importance during the first meeting of building rapport and trust and recognizing complex family histories to encourage voluntary attendance and intervention engagement

Segmentation of anatomical structures in brain MR images using atlases in FSL - a quantitative approach

Segmentation of brain structures from MR images is crucial in understanding the disease progress, diagnosis, and treatment monitoring. Atlases, showing the ex- pected locations of the structures, are commonly used to start and guide the segmentation process. In many cases, the quality of the atlas may have a significant effect in the final result. In the literature, commonly used atlases may be obtained from one subject’s data, only from the healthy, or depict only certain structures that limit their accuracy. Anatomical variations, pathologies, imaging artifacts all could aggravate the problems related to application of atlases. In this paper, we propose to use multiple atlases that are sufficiently different from each other as much as possible to handle such problems. To this effect, we have built a library of atlases and computed their similarity values to each other. Our study showed that the existing atlases have varying levels of similarity for different structures

Microsurgical management of midbrain gliomas: surgical results and long-term outcome in a large, single-surgeon, consecutive series

OBJECTIVE The authors report on a large, consecutive, single-surgeon series of patients undergoing microsurgical removal of midbrain gliomas. Emphasis is put on surgical indications, technique, and results as well as long-term oncological follow-up. METHODS A retrospective analysis was performed of prospectively collected data from a consecutive series of patients undergoing microneurosurgery for midbrain gliomas from March 2006 through June 2022 at the authors' institution. According to the growth pattern and location of the lesion in the midbrain (tegmentum, central mesencephalic structures, and tectum), one of the following approaches was chosen: transsylvian (TS), extreme anterior interhemispheric transcallosal (eAIT), posterior interhemispheric transtentorial subsplenial (PITS), paramedian supracerebellar transtentorial (PST), perimedian supracerebellar (PeS), perimedian contralateral supracerebellar (PeCS), and transuvulotonsillar fissure (TUTF). Clinical and radiological data were gathered according to a standard protocol and reported according to common descriptive statistics. The main outcomes were rate of gross-total resection; extent of resection; occurrence of any complications; variation in Karnofsky Performance Status score at discharge, 3 months, and last follow-up; progression-free survival (PFS); and overall survival (OS). RESULTS Fifty-four patients (28 of them pediatric) met the inclusion criteria (6 with high-grade and 48 with low-grade gliomas [LGGs]). Twenty-two tumors were in the tegmentum, 7 in the central mesencephalic structures, and 25 in the tectum. In no instance did the glioma originate in the cerebral peduncle. TS was performed in 2 patients, eAIT in 6, PITS in 23, PST in 16, PeS in 4, PeCS in 1, and TUTF in 2 patients. Gross-total resection was achieved in 39 patients (72%). The average extent of resection was 98.0% (median 100%, range 82%-100%). There were no deaths due to surgery. Nine patients experienced transient and 2 patients experienced permanent new neurological deficits. At a mean follow-up of 72 months (median 62, range 3-193 months), 49 of the 54 patients were still alive. All patients with LGGs (48/54) were alive with no decrease in their KPS score, whereas 42 showed improvement compared with their preoperative status. CONCLUSIONS Microneurosurgical removal of midbrain gliomas is feasible with good surgical results and long-term clinical outcomes, particularly in patients with LGGs. As such, microneurosurgery should be considered as the first therapeutic option. Adequate microsurgical technique and anesthesiological management, along with an accurate preoperative understanding of the tumor's exact topographic origin and growth pattern, is crucial for a good surgical outcome

[Zeynep Fırat tarafından T.C. Emekli Sandığı Genel Müdürlüğü'ne gönderilen yazı]

Taha Toros Arşivi, Dosya No: 183-Feyhaman-Güzin DuranUnutma İstanbul projesi İstanbul Kalkınma Ajansı'nın 2016 yılı "Yenilikçi ve Yaratıcı İstanbul Mali Destek Programı" kapsamında desteklenmiştir. Proje No: TR10/16/YNY/010

Yarı-rijit bağlı prefabrik endüstriyel binaların deprem performansının değerlendirilmesi

In this study, the performances of 120 precast factory buildings consisting of five different types in an industrial area in Istanbul, Turkey are examined before and after the applications of retrofit methods through nonlinear time history analyses. The factory buildings were constructed and became operational before the 1999 Kocaeli earthquake. Following the earthquake, they were operationally safe, however, after the evaluation according to the 1998 Turkish Earthquake Code (TEC), most of the connections were found to be inadequate. The buildings were retrofitted by using bolted steel plates in the connection regions and diagonal steel braces in 2005. A detailed finite element model of the connection was developed before and after the retrofit methods and the behavior of the region was implemented in the three-dimensional models of the structures. The buildings were analyzed according to the Turkish Earthquake Code 2007. The number of damaged beams by the TEC-2007 was higher than the rate of damaged beams per the FEMA-356. In three-dimensional performance analysis of buildings, the importance of examination of connection regions and implementing the results to the full building model were emphasized. The performance of the building were increased by reducing the distance between the plane frames in the longitudinal direction and the beam length in the transverse direction.Bu çalışmada, İstanbul'da bir sanayi bölgesinde beş farklı tipten oluşan 120 adet prefabrik fabrika binasının performansları güçlendirme yöntemlerinin uygulanmasından önce ve sonra, zaman tanım alanında doğrusal olmayan analizler ile incelenmiştir. Fabrika binaları 1999 Kocaeli depreminden önce inşa edilmiş ve çeşit endüstrilerde faaliyete geçmiştir. Kocaeli depreminin ardından binalar işletme açısından güvenli kabul edilmiş, ancak 1998 Türk Deprem Yönetmeliği (TDY) koşulları açısından değerlendirildikten sonra kiriş-kolon bağlantılarının çoğunun yetersiz kaldığı tespit edilmiştir. Binalar 2005 yılında birleşim bölgelerinde bulonlu çelik levhalar ve yapı genelinde diyagonal çelik çubuklar kullanılarak güçlendirilmiştir. Bu çalışmada farklı güçlendirme yöntemlerinin uygulanmasından önce ve sonra kirişkolon bağlantı bölgesinin detaylı bir sonlu eleman modeli geliştirilmiş ve bölgenin davranışı yapıların üç boyutlu modellerinde dikkate alınmıştır. Türk Deprem Yönetmeliği 2007 kurallarına uygun olarak fabrika binaları analiz edilmiştir. Güçlendirme tekniklerinin ve genel plan boyutlarının performans seviyeleri üzerindeki etkileri tespit edilmiştir. Analizler sonucunda, TDY 2007 kriterlerine göre hasar gören kiriş elemanları sayısı FEMA-356 koşullarına göre hesaplanan elemanlardan daha fazla bulunmuştur. Yapıların üç boyutlu performans analizlerinde, birleşim bölgelerinin detaylı incelenmesi ve tüm yapı modeline davranışın aktarılması gerektiğinin önemi vurgulanmıştır. Yapıların boyuna doğrultuda düzlem çerçeveler arası uzunluğunun ve kısa doğrultudaki kiriş uzunluklarının azaltılması ile yapı performansının arttığı görülmüştür

Nano boyutlu sıfır değerlikli demir (sdd) parçacıklarının anaerobik amonyum oksidasyonu (anammox) prosesi üzerine etkileri

20 yıl içerisinde azot döngüsünün kayıp halkası olarak keşfedilen yeni bir bakteri türü, Anaerobik Amonyum Oksidasyonu (Anammox) bakterisi, atıksudan azot giderimini biyolojik atıksu arıtmasında önem kazanmıştır. Anammox prosesi çamur oluşumunu azaltmakta, havalandırma ve organik karbon ihtiyacını elimine etmekte, sera gazı oluşumuna katkısı bulunmamaktadır. Düşük maliyetli bir proses olmasına rağmen Anammox bakterisinin çoğalma hızının düşük olması ve aşı çamurunun henüz çoğu ülkede lokal olarak bulunmaması sebebiyle gerçek ölçekli tercih edilmemektedir. Anammox bakterilerinin Anammoksozom departmanları içerisinde bulunan demir nano parçacıkları bakterilerin metabolizmik demir kullanımlarının bulunduğuna işaret etmektedir. Yapılan çalışmalar, Anammox bakterilerinin ortamına enjekte edilen demir parçacıklarının Anammox aktivitesinde artışa, granüler yapılaşmaya ve hücre dışı polimerik madde salgısında artışa sebep olduklarını ortaya çıkartmıştır. Bu çalışma kapsamında, sıfır değerlikli nano boyutlu demir parçacıklarının (nSDD) Anammox prosesi üzerine etkileri incelenmiştir. Bu kapsamda, ardışık kesikli bir reaktör sistemi sürekli olarak amonyak ve nitrit içeren sentetik atıksu ile beslenmiş ve reaktör haftada 1 ila 3 arası değişen sıklıklar ile 250- 5000 ppb aralığında nSDD ile dozlanmıştır. Demirin Anammox üzerine etkileri amonyak tüketim hızı, nitrit tüketim hızı, N₂ gazı üretim hızı, hücre dışı polimerik madde salgılanması mikroskobik ve moleküler analizler ile takip edilmiştir. -------------------- Over the past 20 years, Anaerobic Ammonium Oxidation (Anammox) bacteria, a newly discovered bacteria as the missing key in the nitrogen cycle, has gained importance in the biological nitrogen removal from wastewater treatment. The Anammox process decreases sludge production, eliminates aeration and organic carbon requirements and does not contribute to the greenhouse gas production. Even though the process costs lower than other biological processes, the slow growth rate of Anammox bacteria and unavailability of local seed sludge in most countries limit the full-scale applications of Anammox process. The iron nano particles existing in the Anammoxosome component of Anammox bacteria indicates the use of the iron for metabolic activities of Anammox bacteria. The past studies showed that iron injection to the Anammox reactors leads to an increase in Anammox growth rates, their granular formation and the extracellular polymeric substance secretion. In the scope of this study; we analyzed the effects of nano sized zero valent iron (nZVI) on Anammox process. The sequencing batch reactor system was fed with the synthetic wastewater containing ammonium and nitrite, and was injected with 250-5000 ppb concentration of nZVI in between 1-3 times a week. The effect of nZVI on Anammox process was followed with ammonium and nitrite removal rates, N₂ gas production rate, secretion of extracellular polymeric substance, microscobic and molecular analyses

Sweeping the Traces of Habermasian Public Sphere in University Radio Stations: A Research from Turkey

This study focuses on freedom of expression among university radio stations in Turkey. Our aim is to reveal the obstacles university radio stations face in speaking freely and to propose a solution to them. We take our conceptual framework from the Habermasian public sphere and focus on the practice of speaking on the radio. Using a qualitative analysis method, we conducted in-depth interviews with the managers of 34 university radio stations in 21 different cities in Turkey. We found that there are many obstacles to freedom of speech facing university radio stations in Turkey