International Journal of Pure and Applied Sciences
Deniz kazaları araştırmaları, kazalarda teknik, insani, operasyonel ve organizasyonel olmak üzere... more Deniz kazaları araştırmaları, kazalarda teknik, insani, operasyonel ve organizasyonel olmak üzere pek çok risk faktörünün önemli etkilere sahip olduğunu göstermektedir. Özellikle kritik öneme sahip olan lokasyonlarda olan kazaların sonuçları ciddi hasarlara ve yıkıma neden olabilmektedir. Mevcut risk değerlendirmelerinde teknik güvenlik sistemlerine odaklanırken, patlama modellemesi çalışmaları büyük önem taşımaktadır. Bu çalışmanın ana amacı, İstanbul Boğazından geçen ve sıvılaştırılmış doğalgaz (LNG) taşıyan tankerlerde olası bir tank patlaması ve yangın durumunda kazanın etki alanlarını incelemektir. Çalışmada açık erişim olan ALOHA yazılım programı kullanılarak 10,000 m3’lük LNG tankında BLEVE senaryosu analiz edilmiştir. Patlamanın yaklaşık 4.4 km'lik tehdit bölgesinde binaların tahrip olmasına, ciddi yaralanmalara ve camların kırılmasına neden olabileceği belirlenmiştir. Ayrıca 2.0 km'lik tehdit bölgesinde 10.0 kW / m2 termal radyasyon oluşacağı ve 60 saniye içinde pot...
Öz- Çalışma yaşamı sırasında iş çevresinin oluşturduğu çalışma ortamının çalışanın bedeni üzerine... more Öz- Çalışma yaşamı sırasında iş çevresinin oluşturduğu çalışma ortamının çalışanın bedeni üzerine etkisi iş sağlığının temel etkenidir. Ergonomik risk faktörlerine maruz kalan çalışanların, fiziksel sağlıklarının korunabilmesi beden ve ruh sağlığının da korunabilmesi açısından önem arz eder. Psikososyal risk etmenleri ile fiziksel ve ergonomik etmenlerin kas ve iskelet sisteminin hem anatomisine hem da fizyolojisine doğrudan olumsuz bir etkisinin olduğu bilinmektedir. Kas ve iskelet sistemindeki fonksiyon bozukluklarının ortaya çıkışında ergonomik risk faktörlerinin yanı sıra psikososyal risklerin de etki ettiği yadsınamaz bir gerçektir. En az fiziksel, kimyasal, biyolojik ve ergonomik riskler için alınan sağlık ve güvenlik önlemleri kadar, buna bağlı olarak ortaya çıkan iş kazası ve meslek hastalıkları le alınırken psikososyal risk etmenleri de hesaba katılmalıdır. Alınacak ergonomik ve psikososyal önlemlerin sağlık sisteminin ana bileşenlerinden olan fizik tedavi hizmeti sunan per...
In this study, we consider the concept of under generalized differentiability for the fuzzy parab... more In this study, we consider the concept of under generalized differentiability for the fuzzy parabolic differential equations. When the fuzzy derivative is considered as generalization of the H-derivative, for our case, the fuzziness is in the coefficents as well as initial and boundary conditions. We analysed and applied to numerically solve a fuzzy parabolic equation by finite difference method. The applicability of presented algorithm is illustrated by solving an examples of fuzzy partial differential equations.
An inverse problem of determining an unknown spacewise-dependent coefficient of lower derivative ... more An inverse problem of determining an unknown spacewise-dependent coefficient of lower derivative in onedimensional parabolic equation is considered. Using the additional condition the unknown coefficient is eliminated and problem is reformulated as a nonclassical parabolic equation along with initial and boundary conditions. Finite diffeerence method and appropriate iterative procedure are applied for discretization and for numerical solution. The effectiveness of the proposed numerical method and regularization technique is illustrated by some examples.
I am very grateful to Prof. Hans Knutsson who made invaluable contributions on improving my resul... more I am very grateful to Prof. Hans Knutsson who made invaluable contributions on improving my results and I thank Mats Andersson for his ideas and guidance. I owe thanks to my classmates from master programme at Istanbul Technical University for keeping up the good spirit for two years and for their help and support during my exchange period. I have special thanks to Yasemin Koray who helped me to form fancy sentences in seconds. Since I am a member of EESTEC (Electrical Engineering Students' European Association) I have been "so sophisticated" and motivated in whatever the challenge is in my life. Thank you my boardies and all my friends who have the EESTEC spirit inside. And lastly, many thanks goes to my extended family for their neverending support and encouragement not only during this study but also all through my life.
Biomass is one of the most important sources of renewable energy. Biomass resources can be utiliz... more Biomass is one of the most important sources of renewable energy. Biomass resources can be utilized by producing biogas in the biogas stations, which include process equipment operating in critical conditions. In this study, a consequence analysis of a methane gas explosion carried out to estimate the explosion and the toxic threat zones of a biogas station in Turkey. ALOHA and PHAST Software Tools are used to realize an explosion by modelling scenarios and thus to estimate the effects of an explosion just to get an insight on methane gas explosion. By using ALOHA software, two different scenarios as leakage from the biogas tank and flammable chemical escaping directly into the atmosphere are designed and calculated by the Gaussian model. In addition to that, two different explosion scenarios as a leakage scenario from the biogas storage tank and a catastrophic rupture scenario are computed by using the PHAST Software. According to the first scenario results from ALOHA, explosions c...
Ergonomi, fiziksel, cevresel ve psikolojik risk faktorlerini inceleyerek insanlarin makine ve cev... more Ergonomi, fiziksel, cevresel ve psikolojik risk faktorlerini inceleyerek insanlarin makine ve cevre ile uyumlulugunu arastiran ve gelistiren cok disiplinli calisma grubudur. Ergonominin temel amaci, calisanlarin sagligini ve guvenligini saglamak ve is verimliligini arttirmaktir (atil kapasitede dusus, uretimde artis, urun kalitesinde artis gibi). Cunku; calisanlari saglikli ve guvenli bir sekilde calistirmak is verimliliginde artis saglar. Bu calismada, bir isletmenin secilen uretim hattinda REBA yontemi ile ergonomik risk analizi yapilmistir ve iyilestirme onerileri sunulmustur. Calisma kumesini uretim hattinda calisan 30 duz isci olusturmaktadir. Yapilan REBA analizi sonucunda, uretim surecinin %66,6'si orta riskte ve %33,4'u yuksek risk altinda oldugu gozlenmistir. Yapilacak iyilestirme calismalari sonucunda ergonomik risklerin azalacagi, uretim ve verimlilikte artis olmasi beklenmektedir.
In this paper, a fractional model for population growth of species within a closed system is cons... more In this paper, a fractional model for population growth of species within a closed system is considered. A numerical method which is based on the implementation of the fractional Legendre functions with a pseudospectral approach is applied. The aim is to show the effectiveness of fractional Legendre functions for the numerical simulation of fractional models.
The TTF Method for the Inverse Problem of Finding Unknown Source in a Heat Equation
Journal of Computational Analysis and Applications
An inverse problem of finding unknown source function in a heat equation is considered. A method ... more An inverse problem of finding unknown source function in a heat equation is considered. A method based on the Trace-Type Functional (TTF) formulation and implicit finite difference scheme is applied for the numerical solution. The convergence and the stability of the method are investigated for some test example. The performance of the method in comparision with other methods are presented.
Numerical Procedures for the Determination of an Unknown Source Parameter in a Parabolic Equation
Proceedings of the Conference on Applied Mathematics and Scientific Computing
Numerical procedures for the solution of an inverse problem of determining unknown source paramet... more Numerical procedures for the solution of an inverse problem of determining unknown source parameter in a parabolic equation are considered. Two different numerical procedures are studied and their comparison analysis is presented. One of these procedures is obtained by introducing transformation of an unknown function, while the other is based on trace functional formulation of the problem.
An inverse problem of identification of a coefficient depending on a solution in the one-dimensio... more An inverse problem of identification of a coefficient depending on a solution in the one-dimensional parabolic equation is considered. Two different algorithms for the solution of this problem are studied and their comparison analysis is presented.
The problem of determining unknown source parameter in two-dimensional heat equation is considere... more The problem of determining unknown source parameter in two-dimensional heat equation is considered. A method based on trace-type functional (TTF) formulation is examined on the solving of considered problem. Some numerical examples are presented.
Journal of Modern Methods in Numerical Mathematics, 2015
Interdisciplinary methodological approaches are fundamental for studying tool use and crop proces... more Interdisciplinary methodological approaches are fundamental for studying tool use and crop processing patterns in the archaeological record. Many archaeological studies of plant microfossil evidence, primarily those of phytoliths, starch grains and pollen, are concerned with processing methods which can be replicated through experimentally produced plant residues. However, most of these studies rely on crop identification through the presence or absence of such microfossils while giving little or hardly any weight to taphonomy and formation processes, which are critical for interpreting archaeological contexts. An investigation of experimentally produced phytolith and pollen assemblages provides the opportunity to evaluate the impact of cereal processing on both microfossils. Controlled experiments were conducted at the Museum of Menorca, Balearic Islands, Spain, for assessing microfossil taphonomy using Iron Age Talayotic tools and Hordeum vulgare (hulled barley) grown nowadays on the island. For dehusking, a sandstone mortar and a wooden pestle were used outdoors, whereas grinding took place indoors using a limestone quern and handstone. The results indicate that the size of multicellular or anatomically connected phytoliths decreases as a result of mechanical degradation suffered through processing activities, whereas the proportion of cereal pollen grains increases through these processes. Additionally, experimental samples from dehusking and sieving provided abundant evidence of floral bracts, and also of other plant parts and even different plant species, such as phytoliths 2 from leaves and stems and non cereal pollen taxa, which were also to be found on the surfaces of the ground stone tools. These findings highlight the importance of integrating different lines of microfossil evidence and taking into account formation and taphonomic aspects, as well as the value of experimentally produced data for a better understanding of tool use and crop processing.
Abstract: Fuzzy difference equations initially introduced by Kendel and Byatt [1,2]. An important... more Abstract: Fuzzy difference equations initially introduced by Kendel and Byatt [1,2]. An important effort to study of equations has been made by Buckley[3]. In this work we apply the method of fuzzy difference equations to study same problems in finance. As a source of different cases of finance equations we use the work by Chrysafis, Papadopolous, Papaschinopoulos [4,13,16,17]. To illustrate the applicability of the method we give numerical examples.
Normalleşme Sürecinde Ofis Çalışmalarında Covid-19’u Önlemede Balık Kılçığı Yöntemi ile Sebep Sonuç Analizi
International Journal of Advances in Engineering and Pure Sciences
COVID-19 hastaliginin bulasma hizini yitirdigi normale donus surecinin baslangic gunlerinde, Duny... more COVID-19 hastaliginin bulasma hizini yitirdigi normale donus surecinin baslangic gunlerinde, Dunya Saglik Orgutu ve Uluslararasi Calisma Orgutu isyerleri icin yapilmasi gerekenlerle ilgili genis yelpazeli oneri ve cagrilar yapmaktadir. Buna ragmen, guncellenmesi gereken ilk adim olan isyeri risk degerlendirmesine ozgu bilimsel calismalar oldukca kisitlidir. Bu calismada, COVID-19 hastaliginin golgesinde normallesme surecinin ise donus kapsaminda ofis calismalari icin risk degerlendirmesi ve etkisi incelenmistir. Yapilan calisma kapsaminda virusun bulasma riskinin olasi nedenleri sebep-sonuc analizi olarak da adlandirilan balik kilcigi diyagrami kullanilarak belirlenmis ve COVID-19 hastaligina yakalanmamak icin, risklere bagli olarak alinmasi gereken onlemlerin neler olmasi gerektigi vurgulanmistir. Sonuc olarak, COVID-19 hastaliginin cogunlukla 6 temel surecin risklerinden kaynaklandigi gorulmustur. Bu temel sureclerin bilesenleri, ulasim, giris-cikislar, calisma ortami, toplanti ve egitimler, ortak kullanilan alanlar ve calisanlar olarak belirlenmistir. Alinmasi gereken en onemli uc onlem ortaya konulmustur. Bunlardan birincisi, salgin hastalik eylem planinin hazirlanarak gorev tanimlari ve faaliyetler acisindan surekli olarak uygulanabilir sekilde guncel tutulmasi ve denetlenmesidir. Ikincisi, ofis yonetimlerinin alinan onlemlere uyma konusunda calisanlara ornek olmasidir. Son olarak, ucuncusu onlem ise, isyerine giris-cikislarda ates olcumu gibi COVID-19’a yonelik semptomlarin sorgulanmasi ve takip edilmesi olarak belirlenmistir. Calismada ayrica, ornek bir KOBI secilerek, Uluslararasi calisma orgutu (ILO)’nun yayinladigi, KOBI'ler icin “Alti Adimda Covid-19 Is Surekliligi Plani” dokumani rehberliginde, elde edilen risk degerlendirmesi sonuclari da goz onunde bulundurularak, Is Surekliligi Plani hazirlanmistir.
In this paper Milne’s predictor-corrector method to solve the fuzzy first first-order initial val... more In this paper Milne’s predictor-corrector method to solve the fuzzy first first-order initial value problem are investigated. Sufficiently conditions for stability and convergence of the proposed algorithm are also proved. Their applicability is illustrated by two examples.
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