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ÖzÜ Önderliğinde Bir Başka İnovasyon
No full textCivanlar, Reha (2016). "ÖzÜ Önderliğinde Bir Başka İnovasyon" Creative Commons Türkiye Lansmanı, 11 Mart 2016. Özyeğin Üniversitesi, İstanbul
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Multiple-description coded streaming video multicast over software-defined networs
No full textVideo has become one of the most prominent applications of the Internet. Many of the video streaming applications involve the distribution of content from a CDN source to a large population of interested clients. However, widespread support of IP-Multicast has been unavailable to a large extent due to technical and economical reasons, all stemming from the non-programmable nature of today's Internet. As a solution, streaming multicast video is commonly operated using application level multicast. However, this technique introduces excessive delays for the clients and increased traffic load for the network. This thesis is concerned with the introduction of a SDN based framework that allows the network controller to not only deploy IP-Multicast between a source and subscribers, but also control, via a simple northbound interface, the distributed set of sources where multiple-description coded video content is available. Standard and premium users are envisioned. While standard subscribers are to receive one of the descriptions of the video, premium subscribers will receive multiple descriptions, each from a different source, simultaneously and combine these descriptions prior to playback for increased video quality. In the framework, the controller constructs and maintains a dynamic multicast tree from each source and formulates the associated multicast routes. An experimental testbed has been setup on Mininet to assess the performance of the SDN-based streaming multicast video application using QoS performance metrics on a well-known test videos. We observe that for medium to heavily loaded networks, relative to todays solution of application layer multicast in a non-SDN network, the SDN-based streaming multicast video framework increases the PSNR of the received video significantly, from a level that is practically unwatchable to one that has good quality.Video internetin en önemli uygulamalarından biri haline geldi. Video akışı sağlıyan uygulamaların birçoğu CDN kaynağından, video talep eden çokça kullanıcıya dağıtılır. Fakat, günümüz internetinin programlanabilir olmayan yapısından dolayı, IP çoğa gönderim tabanlı uygulamaların geniş kitlelere ulasamamaktadır. Çoğa gönderim video akışı için kullanılan çözümlerden birisi, uygulama katmanında çoğa gönderim yapmaktır. Fakat bu teknik, iletişim ağı için ise trafik yoğunluğunun ve kullanıcılar için gecikmenin artmasına sebep olur. Bu calısma, SDN tabanlı, ag denetleyicisinin bir kaynak ve kullanıcılar arası IP çoğa gönderim servisini sagladığı gibi, basit bir üst seviye yönelimli(northbound) arayüz ile coklu betimlenmis video icerigi barındıran dağıtık kaynakları da kontrol ettigi bir cerceve uzerinedir. Bu çalışmada standart ve öncelikli (premium) kullanıcılar olduğunu varsaydık. Standart kullanıcılar video nun tek betimlemesini (description) alırken, öncelikli kullanıcılar birden fazla betimlemesini alabiliyor. Öncelikli kullanıcılar, farklı kaynaklardan, aynı anda sözbu betimlemeleri alıp, oynatımdan önce birleştirerek, video kalitesini arttırmaktadırlar. Bu çalışmada kontrolör -kullanıcılardan aldığı bilgi ışığında- dinamik bir multicast ağacı inşa edip, bu ağacın yenilenmesini sürdürerek, çoğa gönderim rotaları oluşturur. SDN tabanlı çoğa gönderim video akışının performansını değerlendirme amacıyla, deneysel kurulum Mininet ile inşa edildi. Bu çalışmada, SDN tabanlı çoğa gönderim video akış metodolojisinin, günümüz SDN tabanlı olmayan uygulama katmanındaki multicast çözümlerine oranla, yoğun trafik bulunan ağlar için, video PSNR değerini kayda değer şekilde arttırdığı gözlemlenmiştir
Gelişmiş taşıma ile HTTP üzerinden adaptif iletim
No full textQUIC (Quick UDP Internet Connections) is an experimental and low-latency transport network protocol proposed by Google, which is still being improved and specified in the IETF. The viewer's quality of experience (QoE) in HTTP adaptive streaming (HAS) applications may be improved with the help of QUIC's low-latency, improved congestion control and multiplexing features. In this master thesis, we measured the streaming performance of QUIC on wireless and cellular networks in order to understand whether the problems that occur when running HTTP over TCP can be reduced by using HTTP over QUIC. The performance of QUIC was tested in the presence of network interface changes caused by the mobility of the viewer. We observed that QUIC resulted in quicker start of media streams, better streaming and seeking experience, especially during the higher levels of congestion in the network and had a better performance than TCP when the viewer was mobile and switched between the wireless networks. Furthermore, we investigated QUIC's performance in an emulated network that had a various amount of losses and delays to evaluate how QUIC's multiplexing feature would be beneficial for HAS applications. We compared the performance of HAS applications using multiplexing video streams with HTTP/1.1 over multiple TCP connections to HTTP/2 over one TCP connection and to QUIC over one UDP connection. To that effect, we observed that QUIC provided better performance than TCP on a network that had large delays. However, QUIC did not provide a significant improvement when the loss rate was large.QUIC (Quick UDP Internet Connections - Hızlı UDP Internet Bağlantıları) Google tarafından bulunan ve halen IETF bünyesinde belirlenmekte ve geliştirilmekte olan düşük gecikmeli ve deneysel bir ağ haberleşme protokolüdür. HTTP üzerinden dinamik adaptif iletim (DASH - Dynamic Adaptive Streaming over HTTP) uygulamalarındaki kullanıcı deneyimi, QUIC'in sunduğu düşük gecikme, gelişmiş trafik kontrolü ve çoğullaşmalı kanallar özellikleri sayesinde geliştirilebilir. Bunu araştırmak amacıyla, TCP üzerinden HTTP kullanıldığında oluşan problemlerin, QUIC üzerinden HTTP kullanılarak azaltılıp azaltılmadığını anlamak için kablosuz ve hücresel ağlar üzerinde QUIC'in iletim performansını ölçtük. QUIC'in performansını izleyicinin hareket halinde olmasından kaynaklanan bağlantı ara yüzü değişikliklerinin bulunduğu ağ koşullarında gözlemledik. Bu araştırmalarımız sonucunda, QUIC'in medyaları daha hızlı başlattığını, özellikle yüksek trafik sıkışıklığı olduğunda daha iyi izleme ve görüntü arama deneyimi sunduğunu ve kullanıcının hareketli olduğu ve kablosuz ağlar arasında bağlantı değiştirdiği durumlarda TCP'den daha iyi performans gösterdiğini gözlemledik. Buna ek olarak, çeşitli miktarlarda gecikme ve kayıpların olduğu deneysel bir ağ ortamında, QUIC'in çoğullaşmalı kanallar özelliğinin HTTP üzerinden adaptif iletim için nasıl faydalı olabileceğini araştırdık. Çoklu TCP bağlantıları üzerinden HTTP1.1, tek TCP bağlantısı üzerinden HTTP/2 ve tek UDP bağlantısı üzerinden QUIC ile çoğullaşmalı kanallar kullanan adaptif iletim uygulamalarının performanslarını karşılaştırdık. Bu hususta, QUIC'in yüksek gecikme olan ağlarda TCP'den daha iyi performans gösterdiğini gözlemledik. Buna karşın, QUIC'in yüksek kayıp olan ağlarda önemli bir iyileşme sağlamadığını gördük
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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