457 research outputs found

    Embedding spanning subgraphs into large dense graphs

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    In this thesis we are going to present some results on embedding spanning subgraphs into large dense graphs. Spanning Trees Bollob'as conjectured that if GG is a graph on nn vertices, delta(G)geq(1/2+epsilon)ndelta(G) geq (1/2 + epsilon) n for some epsilon>0epsilon > 0, and TT is a bounded degree tree on nn vertices, then TT is a subgraph of GG. The problem was solved in the affirmative by Koml'os, S'ark"ozy and Szemer'edi for large graphs. They then strengthened their result, and showed that the maximum degree of TT need not be bounded: there exists a constant cc such that TT is a subgraph of GG if Delta(T)leqcn/lognDelta(T) leq cn / log n, delta(G)geq(1/2+epsilon)ndelta(G) geq (1/2 + epsilon) n and nn is large. Both proofs are based on the Regularity Lemma-Blow-up Lemma Method. Recently, using other methods, it was shown that bounded degree trees embed into graphs with minimum degree n/2+Clognn/2 + C log n, where CC is a constant depending on the maximum degree of TT. Here we show that in general n/2+O(Delta(T)cdotlogn)n/2 + O(Delta(T) cdot log n) is sufficient for every Delta(T)leqcn/lognDelta(T) leq cn / log n. We also show that this bound is tight for the two extreme values of mm i.e. when m=Cm = C and when m=cn/lognm = cn / log n. Powers of Hamiltonian Cycles In 1962 P'osa conjectured that if delta(G)geqfrac23ndelta(G) geq frac{2}{3}n then GG contains the square of a Hamiltonian cycle. Later, in 1974, Seymour generalized this conjecture: if delta(G)geq(frack1k)ndelta(G) geq (frac{k-1}{k})n then GG contains the (k1)(k-1)th power of a Hamiltonian cycle. In 1998 the conjecture was proved by Koml'os, S'ark"ozy and Szemer'edi for large graphs using the Regularity Lemma. We present a ``deregularised" proof of the P'osa-Seymour conjecture which results in a much lower threshold value for nn, the size of the graph for which the conjecture is true. We hope that the tools used in this proof will push down the threshold value for nn to around 100 at which point we will be able to verify the conjecture for every nn.Ph.D.Includes bibliographical referencesIncludes vitaby Asif Jamshe

    “Effect of Fruit hardening treatments on Postharvest quality maintenance and Shelf life extension of Fig (Ficus carica L.)Fruits at low temperature storage condition

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    This Dissertation / Report is the outcome of investigation carried out by the creator(s) / author(s) at the department/division of Central Food Technological Research Institute (CFTRI), Mysore mentioned below in this page

    Prediction of particle concentration profiles in binary-solid liquid fluidized bed

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    A simple mixing rule is presented here to predict the concentration profile of individual particle species in a binary-solid liquid fluidized bed from the information about the total solid concentration in the bed. Using the experimental data available in the literature, the applicability of this approach is demonstrated for the presence of different size particles in the bed. For the case of binary-solid fluidized bed showing layer inversion behavior, this simple mixing rule is capable of predicting the concentration of two species from the total solid concentration data of the bed.Corresponding Author: Dr. Mohammad Asif, Professor Department of Chemical Engineering, College of Engineering, King Saud University, P.O. Box 800, Riyadh-11421, Saudi Arabia. Email: [email protected]

    Planlı davranış teorisi çerçevesinde özel günlerdeki satın alma davranışlarının incelenmesi: Rize örneği / Investigation of the purchasing priorities on the special days within the framework of planned behaviour theory: The example of Rize

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    Bu çalışmanın amacı, özel günlerdeki satın alma davranışlarının Planlı Davranış Modeli çerçevesinde incelenmesidir. Uygulama kapsamında tüketicilerin özel günlerde hediye satın alma davranışları ile bu ''Davranışı'' etkileyen ''Davranışa Yönelik Tutum'', ''Öznel Norm'', ''Algılanan Davranışsal Kontrol'' ve ''Niyet'' değişkenleri arasındaki ilişki ortaya konulmaktadır. Gerekli verileri elde etmek için Rize ilinde, yüz yüze olarak 520 adet anket uygulaması yapılmıştır. Ölçeklerin güvenilirliğinin saptanmasında Cronbach alfa (α) katsayısı kullanılmıştır. Bağımsız değişkenlere ait soruların faktörlere beklenildiği şekilde ayrılıp ayrılmadığını belirlemek amacıyla faktör analizi gerçekleştirilmiştir. Ayrıca ki-kare analizi yapılarak değişkenler arasındaki ilişkinin anlamlı olup olmadığı ortaya konulmuştur. Son olarakta regresyon analizi ile PDT modelindeki hipotezler test edilmiştir. Araştırmaya ait tüm hipotezler kabul edilmiştir. Böylece Davranışa Yönelik Tutum, Öznel Norm ve Algılanan Davranışsal Kontrol ile Niyet arasında pozitif yönlü bir ilişki olduğu sonucuna varılmıştır. Niyet üzerindeki değişim öncelikle Davranışa Yönelik Tutum tarafından oluşturulduğu (b=0.483) tespit edilmiştir. Aynı zamanda Algılanan Davranışsal Kontrol ve Niyet ile Fiili Davranış arasında da pozitif yönlü bir ilişki olduğu ve Fiili Davranışı açıklamada Niyet değişkenin daha fazla açıklama oranına sahip olduğu (b=0.402) sonucuna ulaşılmıştır. Anahtar Kelimeler: Satın Alma Davranışları, Özel Günler, Hediye Satın Alma Niyeti, Planlı Davranış TeorisiThe purpose of this study is to examine purchasing behaviors for special days within the framework of the Planned Behavioral Model. Within the context of the application, the relationship between the purchasing behaviors of the consumers on special days and the variables of 'Attitude for Behavior', 'Subjective Norm', 'Perceived Behavioral Control' and 'Intentions' affecting this 'Behavior' are revealed. In order to obtain the required data, 520 face-to-face questionnaires were applied in Rize province. The Cronbach alpha (α) coefficient was used to determine the reliability of the scales. Factor analysis was performed to determine whether the questions of the independent variables were separated as expected according to the factors. In addition, chi-square analysis was performed to determine whether the relationship between the variables is significant. Finally, hypotheses in the PDT model were tested by regression analysis. All hypotheses related to the research were accepted. Thus, it has been determined that there is a positive relationship between Attitude towards Behavior, Subjective Norm, and Perceived Behavioral Control and Intention. The change on intention was first determined by the attitude towards behavior (b = 0.483). At the same time, there was a positive relationship between Perceived Behavioral Control and Intention and Actual Behavior. Finally, in describing the Actual Behavior, it was found that the intention variable had a greater explanatory rate (b = 0.402). Keywords: Purchasing Behavior, Special Days, Gift Purchasing Intention, Planned Behavior Theor

    Elektronik ortamda alışveriş yapanların kontrolsüz satın alma eğilimleri üzerine bir araştırma (Rize ili örneği) / An investigation of compulsive buying tendencies of shoppers in electronic environment (Example of Rize province)

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    Bu çalışmanın birinci bölümünde mağazasız perakendecilik ve elektronik perakendecilik, ikinci bölümde ise satın alma çeşitleri ve kontrolsüz satın alma konuları teorik olarak incelenmiştir. Bu amaçla da elektronik ortamda alışveriş yapan insanların kontrolsüz satın alma eğilim durumlarının incelenmesi amacıyla çalışma yürütülmüştür. Araştırma için gerekli olan veriler, anket yöntemi kullanılarak elde edilmiştir. 384 geçerli anket SPSS 16.0 paket yazılım programı kullanılarak analiz edilmiştir. Araştırma sonunda kontrolsüz satın alma eğilimi ile medeni durum ve cinsiyet arasında anlamlı bir ilişki olduğu keşfedilmiştir. Bunun yanı sıra kontrolsüz satın alma eğilimi ile meslek, aylık gelir ve eğitim durumu arasında anlamlı bir ilişki olmadığı ortaya konmuştur.The study investigates theoretical framework of non-store retail management and online retail management in the first chapter and types of buying and compulsive buying in the second. For this purpose, the study investigated the compulsive buying tendencies of shoppers in electronic environment. For the study, data was collected by survey method. 384 questionnaires were analyzed by SPSS 16.0 package software. Results revealed that compulsive buying tendencies has a significant relationship with marital status and gender. Besides, compulsive buying tendencies does not have a significant relationship with profession, monthly income and educational status

    Semantic Question Classification Datasets

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    This is the datasets used in the following paper:Can Taxonomy Help? Improving Semantic Question Matching using Question TaxonomyPaper: http://aclweb.org/anthology/C18-1042If you use the dataset please cite the following paper:@InProceedings{C18-1042, author = "Gupta, Deepak and Pujari, Rajkumar and Ekbal, Asif and Bhattacharyya, Pushpak and Maitra, Anutosh and Jain, Tom and Sengupta, Shubhashis", title = "Can Taxonomy Help? Improving Semantic Question Matching using Question Taxonomy", booktitle = "Proceedings of the 27th International Conference on Computational Linguistics", year = "2018", publisher = "Association for Computational Linguistics", pages = "499--513", location = "Santa Fe, New Mexico, USA", url = "http://aclweb.org/anthology/C18-1042" } </div

    BigExcel : a web-based framework for exploring big data in Social Sciences

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    This research was pursued through an Amazon Web Services Education Research Grant. The first author was the recipient of an Erasmus Mundus scholarship.This paper argues that there are three fundamental challenges that need to be overcome in order to foster the adoption of big data technologies in non-computer science related disciplines: addressing issues of accessibility of such technologies for non-computer scientists, supporting the ad hoc exploration of large data sets with minimal effort and the availability of lightweight web-based frameworks for quick and easy analytics. In this paper, we address the above three challenges through the development of 'BigExcel', a three tier web-based framework for exploring big data to facilitate the management of user interactions with large data sets, the construction of queries to explore the data set and the management of the infrastructure. The feasibility of BigExcel is demonstrated through two Yahoo Sandbox datasets. The first dataset is the Yahoo Buzz Score data set we use for quantitatively predicting trending technologies and the second is the Yahoo n-gram corpus we use for qualitatively inferring the coverage of important events. A demonstration of the BigExcel framework and source code is available at http://bigdata.cs.st-andrews.ac.uk/projects/bigexcel-exploring-big-data-for-social-sciences/

    Prediction of tool temperature during machining of Ti-6Al-4V alloy with atomization-based cutting fluid spray system

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    Atomization-based cutting fluid (ACF) spray system is being sought as an alternative to cooling processes currently used for machining difficult-to-cut materials such as Ti-6Al-4V alloy. The ACF spray system generates a stream of monodispersed droplets of cutting fluid which then gets mixed in a high-velocity gas flow to form a focused axisymmetric jet of droplets. During machining, this jet is able to penetrate the small region of the tool-chip interface helping in lubrication and cooling of the interface. The advantage of the ACF spray system is that it requires very small amount of cutting fluid, which makes the system more energy efficient and environmentally friendly. It has been recently reported that ACF spray system improves machining performances including tool life and reduced temperature near the tool-chip interface in turning Ti-alloy. It is clear from these studies that the reduction in temperature and improvement in machining are mainly dependent on the interaction of the cutting fluid from the ACF spray system with the chip-tool interface. Therefore, it is imperative to have a physics-based understanding of the phenomena taking place at the interface that is responsible for the tool temperature reduction. In this study, a thermal model for the atomization-based cutting fluid (ACF) spray system is developed to predict the temperature of the cutting edge of the tool during machining of titanium alloys. In the model, film boiling is taken into account because of the high temperatures involved in turning of Ti-6Al-4V alloy. Due to film boiling a thin vapor film is formed between the heated tool surface and the droplet. Heat is being conducted away from the tool through this film. It is shown that the thermal model is able to predict the temperature reduction due to ACF spray cooling and the predicted temperature profile is comparable to the experimental results.Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2017-08-01The student, Asif Tanveer, accepted the attached license on 2015-07-24 at 11:26.The student, Asif Tanveer, submitted this Thesis for approval on 2015-07-24 at 11:34.This Thesis was approved for publication on 2015-07-24 at 12:56.DSpace SAF Submission Ingestion Package generated from Vireo submission #8643 on 2015-09-29 at 15:06:54Made available in DSpace on 2015-09-29T21:08:27Z (GMT). No. of bitstreams: 2 TANVEER-THESIS-2015.pdf: 5086790 bytes, checksum: 282d1e7303cadf265c50b5554666401f (MD5) LICENSE.txt: 4209 bytes, checksum: bd7acda06591d0aee5bc8c7fd43c53f5 (MD5) Previous issue date: 2015-07-24Embargo set by: Seth Robbins for item 89602 Lift date: 2017-09-29T21:08:35Z Reason: Author requested closed access (OA after 2yrs) in Vireo ETD systemLimited Restriction Lifted for Item 89602 on 2017-09-30T09:15:32Z

    Healthcare under sanctions in iraq: An elective experience

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    As a consequence of the 1991 Gulf War and the ensuing UN sanctions, not only was the Iraqi government destroyed, but also the general infrastructure of the country was disrupted, with the civilian population and public services bearing much of the aftermath. Ten years after the war, the health system in Iraq is still in a perilous situation. The effects of sanctions have affected almost every aspect of medical care. There has been a mass exodus of health care professionals, many of whom were foreign nationals. Doctors ’ salaries fell rapidly to only $30 a month, barely enough to buy the necessities of daily living. Iraqi hospitals have no access to foreign journals, textbooks or the internet; leading to a generation of out-dated and underskilled health professionals. Most worrying is the ever-present embargo on many essential medicines. Only one-third of the medicines are available for chemotherapy for the treatment of acute lymphoblastic leukaemia in children (UKALL 97 modified 99 protocol). At the AI-Mansour paediatric teaching hospital this shortfall has led to a substantial increase in childhood mortality, with disease-free survival rates falling to 25 per cent compared to 60 per cent in 1988
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