2,168 research outputs found
The Development Impact of Information Technology in Trade Facilitation
No full textThe main purpose of this chapter is to provide an overview and context of the country studies on Information Technology (IT) for Trade Facilitation (TF) in Small and Medium Enterprises (SMEs).Impact of Information Techonology, Trade Facilitation, SMEs
Evaluation of ITER TF Coil Joint Performance
No full textTo evaluate the ITER TF joint performance, the joint test sample, which consists of two short TF conductors and has full size joint, shall be tested using NIFS test facility under the condition of current of 68 kA and external field of 2 T. For high accuracy, the issue of voltage difference between cable and jacket had been anticipated in the evaluation of joint resistance. If a voltage difference exist between them, it is difficult to measure real joint resistance using voltage taps on the jacket. Therefore, the author first calculated the position where voltage of cable and jacket become equipotential and then decided the voltage tap position where the influence of voltage drop could be avoided. Thus, a high accuracy measurement of joint resistance could be achieved and the joint resistance was accurately evaluated as around 1 n Ω , which is well below the ITER requirement of 3 n Ω .journal articl
The hypergeometric test performs comparably to TF-IDF on standard text analysis tasks
No full textTerm frequency-inverse document frequency, or TF-IDF for short, and its many variants form a class of term weighting functions the members of which are widely used in text analysis applications. While TF-IDF was originally proposed as a heuristic, theoretical justifications grounded in information theory, probability, and the divergence from randomness paradigm have been advanced. In this work, we present an empirical study showing that TF-IDF corresponds very nearly with the hypergeometric test of statistical significance on selected real-data document retrieval, summarization, and classification tasks. These findings suggest that a fundamental mathematical connection between TF-IDF and the negative logarithm of the hypergeometric test P-value (i.e., a hypergeometric distribution tail probability) remains to be elucidated. We advance the empirical analyses herein as a first step toward explaining the long-standing effectiveness of TF-IDF from a statistical significance testing lens. It is our aspiration that these results will open the door to the systematic evaluation of significance testing derived term weighting functions in text analysis applications
Physical training as a factor in the renal morbidity compression of in diabetic rats
No full textIntrodução: o Diabetes Mellitus (DM), uma das doenças crônicas não transmissíveis (DCNTs) de maior magnitude segundo a Organização Mundial de Saúde (OMS), consiste em fator de risco para a nefropatia induzida por contraste (NIC). Terapias não farmacológicas, como o treinamento físico (TF) regular, são estimuladas pela OMS para a prevenção e o tratamento das DCNTs. Objetivo: verificar o efeito do TF em intensidade moderada sobre a função renal, hemodinâmica, perfil oxidativo e histologia renal de ratos diabéticos que receberam contraste iodado (CI). Métodos: ratos Wistar, machos, 250 a 310 g, randomizados por grupos: citrato: animais que receberam tampão citrato (veículo da estreptozotocina -STZ-, 0,4 mL intravenoso -i.v-, dose única); Citrato+TF: animais citrato submetidos ao TF, uma hora/dia, 5 dias/semana, suportando carga equivalente a 5% do peso corporal do animal; CI: animais que receberam CI (6 mL/kg, intraperitoneal -i.p.-, dose única); CI+TF: animais submetidos ao TF e que receberam CI; DM: animais que receberam STZ (60 mg/kg, i.v., dose única); DM+TF: animais DM submetidos ao TF; DM+CI: animais DM que receberam CI; DM+CI+TF: animais DM submetidos ao TF e que receberam CI. Foram avaliados parâmetros de treinabilidade (citrato sintase); fisiológicos (glicemia, peso corporal, peso renal, relação peso do rim/peso animal); função renal (clearance de inulina, fluxo urinário, creatinina sérica, albuminúria); hemodinâmica renal (fluxo sanguíneo renal, resistência vascular renal); perfil oxidativo (peróxidos, nitrato e substâncias reativas com o ácido tiobarbitúrico na urina, tióis solúveis no tecido renal) e histologia renal (alterações tubulointersticiais). Resultados: o modelo de DM resultou em hiperglicemia, diminuição de peso corporal, aumento na ingestão alimentar e hídrica, no fluxo urinário, albuminúria, creatinina sérica, resistência vascular renal, metabólitos oxidativos, lesão túbulo-intersticial associados à diminuição do clearance de inulina, fluxo sanguíneo renal e reserva antioxidante tiólica. O TF foi capaz de corrigir tais alterações em DM+TF. O CI resultou em piora nos parâmetros mencionados no grupo DM+CI, enquanto o grupo DM+CI+TF demonstrou atenuação da redução de função renal, melhora da hemodinâmica, perfil oxidativo e histologia renal. Conclusão: os resultados confirmaram que o DM predispõe à NIC e que o TF regular moderado tem papel renoprotetor sobre a função renal, hemodinâmica, perfil oxidativo e histologia renal de ratos diabéticos submetidos ao tratamento com CI.Introduction: Diabetes Mellitus (DM), one of the chronic noncommunicable diseases (CNCDs) with the greatest magnitude according to the World Health Organization (WHO), is a risk factor for contrast-induced nephropathy (CIN). Non-pharmacological therapies, such as regular physical training (PT), are encouraged by the WHO to prevent and treat CNCDs. Objective: Verify the effect of PT at moderate intensity on renal function, hemodynamics, oxidative profile, and renal histology in diabetic rats that received iodinated contrast (IC). Methods: Male Wistar rats, 250 to 310 g, randomized into the following groups: Citrate: animals that received citrate buffer (vehicle of streptozotocin (STZ), 0.4 ml intravenous (i. v), single dose); Citrate+PT: citrate animals submitted to PT, 1 hour/day, 5 days/week, supporting load equivalent to 5% of the animal\'s body weight; IC: animals that received IC (6 ml/kg, intraperitoneal (i.p.), single dose); IC+PT: animals submitted to PT and that received IC; DM: animals that received STZ (60 mg/kg, i.v, single dose); DM+PT: DM animals that received PT; DM+CI: DM animals that received IC; DM+CI+PT: DM animals that received PT and IC. Training (citrate synthase); physiological (glycemia, body weight, kidney weight, kidney weight/animal weight ratio); renal function (inulin clearance, urinary flow, serum creatinine, albuminuria) parameters were evaluated; kidney hemodynamics (renal blood flow, renal vascular resistance); oxidative profile (peroxides, nitrate and thiobarbituric acid reactive substances in urine, soluble thiols in renal tissue) and kidney histology (tubulointerstitial changes). Results: The DM model resulted in hyperglycemia, decreased body weight, increased food and water intake, urinary flow, albuminuria, serum creatinine, renal vascular resistance, oxidative metabolites, tubulo-interstitial injury associated with decreased inulin clearance, renal blood flow, and thiol antioxidant reserve. PT was able to revert such alterations in DM+PT. IC resulted in worsening of the mentioned parameters in the DM+ IC group, while the DM+CI+PT group demonstrated attenuation of reduced renal function, improved hemodynamics, oxidative profile, and renal histology. Conclusion: The results confirmed that DM predisposes to CIN, and that regular moderate PT plays a kidney-protective role on kidney function, hemodynamics, oxidative profile, and kidney histology of diabetic rats submitted to IC treatment
"Convertible Bond Underpricing: Renegotiable Covenants, Seasoning and Convergence"
No full textWe investigate the long-standing puzzle on the underpricings of convertible bonds. We hypothesize that the observed underpricing is induced by the possibility that a convertible bond might renegotiate on some of its covenants, e.g., an imbedded put option, in financial difficulties. Consistent with our hypothesis, we find that the initial underpricing is larger for lower rated bonds. The underpricing worsens if the issuer experiences subsequent financial difficulties. However, conditional on no rating downgrades, our main empirical result shows that convertible bond prices do converge to their theoretical prices within two years. This seasoning period is shorter for higher rated convertible bonds.
Who said that? Comparing performance of TF-IDF and fastText to identify authorship of short sentences
No full textAuthorship identification is often applied to large documents, but less so to short, everyday sentences. The ability of identifying who said a short line could provide help to chatbots or personal assistants. This research compares performance of TF-IDF and fastText when identifying authorship of short sentences, by applying these feature extraction techniques to the television series Friends' transcripts. TF-IDF outperforms fastText in every measurement, but its performance is only marginally better than randomly guessing the original character, reaching an accuracy of 28 percent when making a distinction between 6 characters. Accuracy increases linearly at the same rate for both techniques as the minimum word count per sentence set on the test data increases. TF-IDF's confidence remains constant as this limit is set on either the test or training data, whereas fastText's confidence decreases and increases, respectively. Cross-entropy loss, however, remains constant for fastText and decreases for TF-IDF as the minimum word count set on the test data increases.CSE3000 Research ProjectComputer Science and Engineerin
Convertible Bond Underpricing: Renegotiable Covenants, Seasoning and Convergence (Published in "Management Science", Vol. 53, No. 11, November 2007, pp. 1793.1814. )
No full textWe investigate the long-standing puzzle on the underpricings of convertible bonds. We hypothesize that the observed underpricing is induced by the possibility that a convertible bond might renegotiate on some of its covenants, e.g., an imbedded put option, in financial difficulties. Consistent with our hypothesis, we find that the initial underpricing is larger for lower rated bonds. The underpricing worsens if the issuer experiences subsequent financial difficulties. However, conditional on no rating downgrades, our main empirical result shows that convertible bond prices do converge to their theoretical prices within two years. This seasoning period is shorter for higher rated convertible bonds.
Evaluation of ITER TF Coil Joint Performance
No full textTo evaluate the ITER TF joint performance, the joint test sample, which consists of two short TF conductors and has full size joint, shall be tested using NIFS test facility under the condition of current of 68 kA and external field of 2 T. For high accuracy, the issue of voltage difference between cable and jacket had been anticipated in the evaluation of joint resistance. If a voltage difference exist between them, it is difficult to measure real joint resistance using voltage taps on the jacket. Therefore, the author first calculated the position where voltage of cable and jacket become equipotential and then decided the voltage tap position where the influence of voltage drop could be avoided. Thus, a high accuracy measurement of joint resistance could be achieved and the joint resistance was accurately evaluated as around 1 n Ω , which is well below the ITER requirement of 3 n Ω
Extracting location context from transcripts: a comparison of ELMo and TF-IDF
No full textUsing transcripts of the TV-series FRIENDS, this paper explores the problem of predicting the location in which a sentence was said. The research focuses on using feature extraction on the sentences, and training a logistic regression model on those features. Specifically looking at the differences in performance between using ELMo and TF-IDF for this feature extraction, achieving an accuracy rate of 58\% and 67\% respectively on a binary classification. The paper also explores the effect of several data cleaning techniques on the results. Git repository containing the source code used in the paper - https://github.com/David-Happel/scene-location-NLPCSE3000 Research ProjectComputer Science and Engineerin
Author identification system
No full textAbstract: Every one of us has different approach to speak and write, and there exists a long history of linguistic and stylistic analysis into authorship attribution. In last year’s, practical application for author identification have grown in area such as computer forensic(linking intercepted message to each other and to find rebel), criminal law(identifying author of payoff notes and harassing letter), civil law and computer security (tracking author of computer source code). This paper proposes the implementation of author identification system. This proposed system is based upon the principles and concepts of text analysis. For ensuring maximum accuracy in identifying author of the document we will be using TF-IDF algorithm which consists of extraction of features from the text, scoring these features and comparing them with a set of scores stored in the corpus
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