Araç Cüzdanı: Motorlu Araçların Teknik Servis ve Bakım Kayıtlarının Blokzinciri Üzerinde Yönetilmesi

Günlük hayatta edindiğimiz tecrübeler bize özellikle ikinci el motorlu araç satışlarında, araçların geçmişteki teknik servis ve bakım kayıtları gibi bilgilere erişim noktasında sorun yaşandığını göstermiştir. Yaşanan bu zorluk çeşitli mağduriyetlere neden olmaktadır. Blokzinciri, özellikleri ve sunduğu fırsatlar sayesinde karşılaşılan bu sorunun üstesinden gelmek için uygun bir teknoloji olarak değerlendirilebilir. Bu çalışmada her bir araç için özel blokzinciri ağı içerisinde bir hesap tanımlanması ve araç bakım servislerinin, parça sağlayıcıların ve sigorta şirketlerinin de katılımcı olarak bu ağa eklenmesi yöntemine dayanan bir çözüm önerilmektedir. Sunulan çözümde servis noktalarındaki uygulamalar sayesinde araçlara ait bakım, parça değişimi, tamirat gibi işlemlere ilişkin kayıtların blokzinciri hesabına kaydedilmesi ve bu bilgilerin blokzinciri ağında dağıtık, şeffaf ve değiştirilemez olarak saklanması planlanmıştır. Sunulan çözüm sayesinde servis noktalarının ve müşterilerin araçların geçmiş dönemlerdeki servis kayıtlarına şeffaf ve güvenli bir şekilde erişimi sağlanabilecektir

Manoeuvring behaviour of ships in extreme astern seas

In an attempt to contribute the efforts for the robust and effective numerical tools concerning ship motions in astern seas, this thesis presents the development of a coupled non-linear 6-DOF model with frequency dependent coefficients, incorporating memory effects in random waves with a new axis system that allows straightforward combination between seakeeping and manoeuvring model whilst accounting for extreme motions. A combination of seakeeping and manoeuvring is achieved through the adoption of relatively new "horizontal body axis system" which accounts for large vertical motions as well. Furthermore, the frequency dependent terms are incorporated in order to improve the accuracy of the numerical model for non-zero encounter frequencies which are experienced especially when the ship has large heading angle. The effect of encounter frequency and so called "memory effects" are calculated in terms of radiation forces using convolution integrals. Equations of motions and external forces are described in terms of a new axis system. The wave forces are calculated through incident and diffraction wave forces. The incident wave forces are calculated using the instantaneous wave surface while low encounter frequency model is adopted for the calculation of diffraction forces. Finally, the whole numerical model is expressed in random sea environment including the convolution terms to carry out the simulations in more realistic sea environments. The validation of the numerical model with the results of benchmark tests commissioned by ITTC Specialist Group on Stability, showed reasonably satisfactory agreement while the inclusion of frequency dependent terms affected the accuracy of the numerical model. Parametrical studies were carried out to investigate the effect of different environmental and operational parameters to ship motions in extreme astern seas along with the effects of degrees of freedom and encounter frequency. In order to enhance the accuracy of the numerical model and to obtain further information about the coupling of the motions and the adequacy of the numerical model to carry out further simulations regarding dangerous situations during ship motions in random following and quartering seas, extensive captive and free running model tests were carried out. The numerical model provided good agreement with the experiments. The terms resulting from the coupling of vertical motions and large heeling angle to wave forces are obtained. It is believed that the numerical model has a good potential for providing a more rational basis for predicting the dangerous conditions which a ship could face in extreme astern seas, and for offering insights about the link of behaviour with the design parameters of a ship in the light of the validation with the experiment results and parametrical studies.In an attempt to contribute the efforts for the robust and effective numerical tools concerning ship motions in astern seas, this thesis presents the development of a coupled non-linear 6-DOF model with frequency dependent coefficients, incorporating memory effects in random waves with a new axis system that allows straightforward combination between seakeeping and manoeuvring model whilst accounting for extreme motions. A combination of seakeeping and manoeuvring is achieved through the adoption of relatively new "horizontal body axis system" which accounts for large vertical motions as well. Furthermore, the frequency dependent terms are incorporated in order to improve the accuracy of the numerical model for non-zero encounter frequencies which are experienced especially when the ship has large heading angle. The effect of encounter frequency and so called "memory effects" are calculated in terms of radiation forces using convolution integrals. Equations of motions and external forces are described in terms of a new axis system. The wave forces are calculated through incident and diffraction wave forces. The incident wave forces are calculated using the instantaneous wave surface while low encounter frequency model is adopted for the calculation of diffraction forces. Finally, the whole numerical model is expressed in random sea environment including the convolution terms to carry out the simulations in more realistic sea environments. The validation of the numerical model with the results of benchmark tests commissioned by ITTC Specialist Group on Stability, showed reasonably satisfactory agreement while the inclusion of frequency dependent terms affected the accuracy of the numerical model. Parametrical studies were carried out to investigate the effect of different environmental and operational parameters to ship motions in extreme astern seas along with the effects of degrees of freedom and encounter frequency. In order to enhance the accuracy of the numerical model and to obtain further information about the coupling of the motions and the adequacy of the numerical model to carry out further simulations regarding dangerous situations during ship motions in random following and quartering seas, extensive captive and free running model tests were carried out. The numerical model provided good agreement with the experiments. The terms resulting from the coupling of vertical motions and large heeling angle to wave forces are obtained. It is believed that the numerical model has a good potential for providing a more rational basis for predicting the dangerous conditions which a ship could face in extreme astern seas, and for offering insights about the link of behaviour with the design parameters of a ship in the light of the validation with the experiment results and parametrical studies

Manoeuvering behaviour of ships in extreme astern seas

EThOS - Electronic Theses Online ServiceGBUnited Kingdo

The growth of internet advertising sector in the world and status of Turkey in this sector

İnternet reklamcılığı, ekonomik, ölçümlenebilen, hızla yayına alınabilen, hedef kitle belirlenmesine olanak sağlayabilen ve kullanıcı etkileşimine izin veren bir reklamcılık yöntemidir. İnternet reklamcılığı sektörü, oldukça büyük bir hızla yaygınlaşmış ve her geçen gün daha karmaşık bir duruma gelmiştir. Bu yüzden de standartlaşma ve etik rekabet ortamı oluşturabilme adına, çeşitli öz denetim ve idari denetim mekanizmalarının oluşturulması zorunluluğu doğmuştur. Yapılan bu çalışmayla, internet reklamcılığının tarihsel gelişimi, internet kullanım durumları, internet reklamcılığı uygulama yöntemleri, sektörel gelir ve kullanım durumları, düzenleme ve denetleme kurumları başlıkları altında, Türkiye ve dünya ülkeleri penceresinden bakıldığında ortaya çıkan bilgiler sunulmuştur.Internet advertising is an economical advertising method, which can be gauged, rapidly spread, and enables the determination of a target group and user interaction. Internet advertising has rapidly become widespread and day by day has become more complicated. As a result, it has become necessary to set up various self-control and administrative mechanisms to establish standardization and an ethical competition environment. This study looks at the situation in Turkey and other countries under the headings of the historical development of internet advertising, applications in internet advertising, income and usage levels and regulation and supervision institutions, and presents the findings.NUL

The growth of internet advertising sector in the world and status of Turkey in this sector

İnternet reklamcılığı, ekonomik, ölçümlenebilen, hızla yayına alınabilen, hedef kitle belirlenmesine olanak sağlayabilen ve kullanıcı etkileşimine izin veren bir reklamcılık yöntemidir. İnternet reklamcılığı sektörü, oldukça büyük bir hızla yaygınlaşmış vInternet advertising is an economical advertising method, which can be gauged, rapidly spread, and enables the determination of a target group and user interaction. Internet advertising has rapidly become widespread and day by day has become more complic

An improved numerical model for the study of controlled ship motions in extreme following and quartering seas

This article presents an improved numerical model for the study of controlled ship motions in extreme following and quartering seas

Parametric rolling behaviour of azimuthing propulsion-driven ships

The study investigates the experimental and numerical analysis of the occurrence of auto-parametric rolling for large, high-speed pod-driven ships in waves. Considering unique design and performance targets, the aim here is to exploit susceptibility to auto-parametric rolling behaviour and to identify probable design and operational precautions. In order to achieve this aim, an existing non-linear timedomain software to simulate capsizing and other critical manoeuvring behaviours of slow- to mediumspeed conventional and podded ships in waves is being enhanced for fast pod-driven vessels and then compared against the dedicated model test conducted in long-crested regular and random waves for a large, pod-driven containership model. This paper includes the presentation of current numerical modifications for pod-driven ships and the verification analysis

The accuracy and validity of a weekly point-prevalence survey for evaluating the trend of hospital-acquired infections in a university hospital in Turkey

Geyik, Mehmet Faruk/0000-0002-0906-0902WOS: 000296092400005PubMed: 21757384Objective: To evaluate the validity of a weekly point-prevalence survey (WPS) by comparing it with a prospective-active incidence survey (PIS). Methods: WPS and PIS were conducted at a tertiary referral hospital between January and December 2006. Each Wednesday, an infection control team reviewed all clinical records of patients with hospital-acquired infections (HAIs) by WPS. Routine PIS was conducted with daily visits by the same team. The Rhame and Sudderth formula was used for converting the data between WPS and PIS. Results: During the study period, 1287 HAIs were detected in 37 466 patients by WPS. The mean observed prevalence and calculated prevalence were 5.42% and 5.45%, respectively. The reanimation intensive care unit (ICU) (49.4%) and burns unit (27.6%) had the highest prevalence rates. Pneumonia (0.94%) and urinary tract infections (0.37%) were the most frequent infections. Overall 602 HAIs were detected in 545 patients by PIS. The mean observed incidence and calculated incidence were 2.42/1000-admissions and 2.41/1000-admissions, respectively. The Critical care ICU (37.0/1000-admissions) and burns unit (24.8/1000-admissions) had the highest incidences of HAI. Pneumonia (0.64/1000-admissions) and urinary tract infections (0.37/1000-admissions) were the most frequent infections. Conclusions: This study confirms a close relationship between prevalence and incidence data. WPS may be a useful method for following HAIs when PIS cannot be performed. (C) 2011 International Society for Infectious Diseases. Published by Elsevier Ltd. All rights reserved

How do we encounter rare factor deficiencies in children? Single-centre results from Turkey

Background Rare factor deficiencies (RFDs) are autosomal recessively inherited coagulation factor deficiencies encountered at a frequency of between one in 500 000 and one in two million