2,136 research outputs found
Some effective techniques for naive Bayes text classification
No full textWhile naive Bayes is quite effective in various data mining tasks, it shows a disappointing result in the automatic text classification problem. Based on the observation of naive Bayes for the natural language text, we found a serious problem in the parameter estimation process, which causes poor results in text classification domain. In this paper, we propose two empirical heuristics: per-document text normalization and feature weighting method. While these are somewhat ad hoc methods, our proposed naive Bayes text classifier performs very well in the standard benchmark collections, competing with state-of-the-art text classifiers based on a highly complex learning method such as SVM.This work was partly supported by the JSPS Postdoctoral Fellowship Program and the Okumura Group at Tokyo Institute of Technology. H.-C. Rim was the corresponding author
Unsupervised word sense disambiguation using WordNet relatives
No full textThis paper describes a sense disambiguation method for a polysemous target noun using the context words surrounding the target noun and its WordNet relatives, such as synonyms, hypernyms and hyponyms. The result of sense disambiguation is a relative that can substitute for that target noun in a context. The selection is made based on co-occurrence frequency between candidate relatives and each word in the context. Since the co-occurrence frequency is obtainable from a raw corpus, the method is considered to be an unsupervised learning algorithm and therefore does not require a sense-tagged corpus. In a series of experiments using SemCor and the corpus of SENSEVAL-2 lexical sample task, all in English, and using some Korean data, the proposed method was shown to be very promising. In particular, its performance was superior to that of the other approaches evaluated on the same test corpora. (C) 2004 Elsevier Ltd. All rights reserved
Observation of hc radiative decay hc › ??' and evidence for hc › ??
No full textKolcu, Onur Buğra (Arel Author) --- Makale 69 yazarlıdır.A search for radiative decays of the P-wave spin singlet charmonium resonance hc is performed based on 4.48 × 108 ? events collected with the BESIII detector operating at the BEPCII storage ring. Events of the reaction channels hc › ??' and ?? are observed with a statistical significance of 8.4? and 4.0?, respectively, for the first time. The branching fractions of hc › ??' and hc › ?? are measured to be B(hc › ??' ) = (1.52±0.27±0.29)×10-3 and B(hc › ??) = (4.7±1.5±1.4)×10-4 , respectively, where the first errors are statistical and the second are systematic uncertainties
Financial analysis and evaluation of company HC Betons Ltd
No full textDiplomdarba nosaukums: Uzņēmuma SIA HC Betons finanšu analīze un novērtējums
Diplomdarba mērķis ir uz finanšu analīzes pamata izvērtēt uzņēmuma SIA HC Betons esošo finansiālo situāciju un izstrādāt priekšlikumus finansiālā stāvokļa uzlabošanai.
Teorētiskajā daļā apskatīti finanšu analīzes teorētiskie aspekti. Praktiskajā daļā autore veica uzņēmuma SIA HC Betons finanšu analīzi par 2009., 2010., un 2011.gadu. Analītiskajā daļā autore salīdzina rādītājus ar konkurējošo uzņēmumu SIA Cemex.
Autore secinājusi, ka uzņēmumam ir finansiālas grūtības, bet pēc autores domām, uzņēmums tuvāko gadu laikā nebankrotēs.
Diplomdarba apjoms ir 78 lapaspuses, tas sastāv no 3 daļām, 12 tabulām, 5 attēliem un 12 pielikumiem.
Atslēgvārdi: analīze, likviditāte, bankrots, koeficienti.Diploma thesis: Financial Analysis and Evaluation of Company HC Betons Ltd.
The aim of the diploma paper is to evaluate company’s HC Betons Ltd current financial situation based on financial analysis and make suggestions for improvement of the financial position.
Theoretical aspects of financial analysis are discussed in the theoretical part of the paper. In the practical part author has performed company’s HC Betons Ltd financial analysis of the years 2009, 2010 and 2011. In the analytical part author compares ratios of a competing company Cemex Ltd.
The author concludes that the company is in financial difficulties, but according to the author’s thoughts, the company will not bankrupt in the coming years.
The volume of the diploma paper is 78 pages; it consists of 3 parts, 12 tables, 5 images and 12 appendices.
Keywords: analysis, liquidity, bankruptcy, ratios
Metabolic profiling and population screening of analgesic usage in nuclear magnetic resonance spectroscopy-based large-scale epidemiologic studies
No full textThe application of a 1H nuclear magnetic resonance (NMR) spectroscopy-based screening method for determining the use of two widely available analgesics (acetaminophen and ibuprofen) in epidemiologic studies has been investigated. We used samples and data from the cross-sectional INTERMAP Study involving participants from Japan (n = 1145), China (n = 839), U.K. (n = 501), and the U.S. (n = 2195). An orthogonal projection to latent structures discriminant analysis (OPLS-DA) algorithm with an incorporated Monte Carlo resampling function was applied to the NMR data set to determine which spectra contained analgesic metabolites. OPLS-DA preprocessing parameters (normalization, bin width, scaling, and input parameters) were assessed systematically to identify an optimal acetaminophen prediction model. Subsets of INTERMAP spectra were examined to verify and validate the presence/absence of acetaminophen/ibuprofen based on known chemical shift and coupling patterns. The optimized and validated acetaminophen model correctly predicted 98.2%, and the ibuprofen model correctly predicted 99.0% of the urine specimens containing these drug metabolites. The acetaminophen and ibuprofen models were subsequently used to predict the presence/absence of these drug metabolites for the remaining INTERMAP specimens. The acetaminophen model identified 415 out of 8436 spectra as containing acetaminophen metabolite signals while the ibuprofen model identified 245 out of 8604 spectra as containing ibuprofen metabolite signals from the global data set after excluding samples used to construct the prediction models. The NMR-based metabolic screening strategy provides a new objective approach for evaluation of self-reported medication data and is extendable to other aspects of population xenometabolome profiling
Bruch's membrane opening-minimum rim width: An alternative OCT biomarker study for multiple sclerosis
No full textPurpose: Bruch's membrane opening-minimum rim width (BMO-MRW) and RNFL measured using anatomic positioning system (APS-RNFL) are novel OCT methods and remained unexplored in MS patients. To investigate the novel parameters of spectral-domain OCT as an alternative biomarker in patients with multiple sclerosis (MS). Methods: Retrospective cohort study; participants consisted of relapsing-remitting MS (RRMS) patients and healthy controls (HC). Eyes were classified according to the presence of MS and previous optic neuritis (ON). Measurements of standard peripapillary RNFL (S-RNFL), BMO-MRW, and APS-RNFL were performed. Result: A total of 244 eyes of 122 participants (MS-patients: 63, HC: 59) were included in the study. Fifty-one eyes had a history of previous ON. In almost all measured parameters, neuroretinal rim thicknesses were observed the thinnest in eyes with ON history between all subgroups. S-RNFL and APS-RNFL techniques showed the difference in neuroretinal rim thickness in all three subjects (ON+, ON-, and HC). However, BMO-MRW, on the other hand, could not distinguish between ON(-) patients and HC. The relationship between OCT parameters and EDSS were observed only in eyes with an ON history in all three techniques. A meaningful model with 78% accuracy was obtained by using only the OCT parameters as risk factors. In the ROC analysis, no parameters were found to have acceptable high sensitivity and specificity. BMO-MRW was statistically weaker in every aspect than other RNFL techniques. Conclusion: The novel APS-RNFL technique appears to be a bit more reliable alternative to S-RNFL technique to support therapeutic decision-making in MS. BMO-MRW has not been found as a successful alternative to S-RNFL
Analyses of cladding modes in photonic crystal fiber
No full textCharacteristics of cladding modes in a photonic crystal fiber (PCF) are numerically analyzed using the plane wave expansion method. The presence of the outer silica ring in the PCF tends to push the optical fields of the cladding modes toward the rim of the PCF, which creates 'ring modes' whose fields are tightly confined in the outer ring. The dispersion of the cladding modes are determined mainly by the dispersive property of the holey cladding structure. The optical field patterns of the cladding modes and the beatlengths between the fundamental mode and the cladding modes are also investigated. (c) 2007 Optical Society of America.This work was supported by a grant from the Korea Research Foundation (R08-2004-000-
10503-0)
Specific and fitness testing of goalies HC Motor Czech Budejovice\\
No full textThe aim of this bachelor thesis is to test specific and fitness abilities of goalkeepers of HC Motor Czech Budejovice. In the theoretical part of this thesis, based on content analysis of literature research, the author presents motoric abilities, development patterns and overview of most frequently used tests. In the practical part of thesis, the author deals with creating and verifying tested battery. It was designed using the knowledge gained from books reference and self- experience of a player and a coach as well. To obtain the results of performance of particular motoric abilities the author used testing method. The outcomes were subsequently compared with the evaluation of given motoric abilities on ice. The author acquired the evaluation from goalkeeper's coaches of HC Motor Czech Budejovice. Final results are described and thereafter tabularly presented
VIBRATIONAL RELAXATION IN THE BINARY GASEOUS MIXTURES AND
No full textAuthor Institution: Laboratoire de Spectronomie Moleculaire, Universit\'e de Paris VI, 4, Place Jussieu - Tour 13Vibrational relaxation rates for gaseous mixtures , with or , in which vibrational energy transfer can occur from the level of M to the v = 1 level of , has been measured as a function of the temperature using the laser-induced vibrational fluorescence technique. The relaxation processes which must be considered are: - the V-V transfer process: \begin{eqnarray*} &&M(00^{\circ }1)+ HC (v=0)\begin{array}{c}^{k}M-HC\ell\\ \rightleftharpoons\\ ^{k}HC\ell-M\end{array}M(00^{\circ}0)+ HC\ell(v=1)+ \Delta E=he\Delta\nu\\ &&with\ \Delta\nu=-537\, cm^{-1} for\ CO_{2}, -663\, cm ^{-1}\ for\ N_{2}O \end{eqnarray*} - the V-TR de-excitation processes: \begin{eqnarray*} M(00^{\circ}1)+ HC\ell(or M)\stackrel{k^{HC\ell}_{M}}{(o\vec{r}\; k_{M})}M(mn^{\ell}0)+HC\ell (or \; M)\\ HC\ell(v=1)+ M(or\; HC\ell)\stackrel{k^{M}_{HC\ell}}{(o\vec{r}\; k_{HC\ell})}HC\ell(v=0)+M(or \; HC\ell) \end{eqnarray*} For most of the systems in which near-resonant V-V transfers occur, the V-TR de-excitation rates are negligible compared to the V-V transfer rates. But this is not the case for the M-HC systems considered in this work. The de-excitation rates and are of the same order of magnitude as the V-V transfer rates and respectively. In order to determine separately all these rates, relaxation measurements have been performed by exciting either H to the level or to the v = 1 level, and measuring the relaxation rates versus the molar fraction of the gas excited by laser. The results are discussed and compared with the values of the rates calculated by using a Morse potential as the intermolecular potential, and according to a semi-classical method in which a vibration-rotation exchange is assumed
Soma and neurite density abnormalities of paramagnetic rim lesions and core-sign lesions in multiple sclerosis
No full textBackground
In multiple sclerosis (MS), susceptibility-weighted imaging (SWI) may reveal white matter lesions (WML) with a paramagnetic rim (“paramagnetic rim lesions” [PRLs]) or diffuse hypointensity (“core-sign lesions”), reflecting different stages of WML evolution.
Objective
Using the soma and neurite density imaging (SANDI) model on diffusion-weighted magnetic resonance imaging (MRI), we characterized microstructural abnormalities of MS PRLs and core-sign lesions and their clinical relevance.
Methods
Forty MS patients and 20 healthy controls (HC) underwent a 3 T brain MRI. Using SANDI, the fractions of neurite (fneurite) and soma (fsoma) and size of soma (rsoma) were quantified in PRLs (including their core and rim separately), and core-sign lesions identified on SWI-phase.
Results
Among 1811 WMLs, 122 (6.7%) core-sign lesions and 97 (5.4%) PRLs were identified. Compared to HC and MS normal-appearing white matter, all MS WML showed significantly lower fneurite and fsoma and higher rsoma (FDR-p < 0.001). Compared to SWI-isointense WML, core-sign lesions showed a significantly higher fneurite, and lower fsoma and rsoma (FDR-p ≤ 0.005). Compared to SWI-isointense WML and core-sign lesions, PRLs showed a significantly lower fneurite, higher fsoma, and higher rsoma (FDR-p ≤ 0.001). The PRL-core showed significantly lower fneurite, and higher rsoma than PRL-rim (FDR-p < 0.001). Lower PRL fneurite (β ≤ -0.006, FDR-p ≤ 0.015) and higher rsoma (β ≥ 0.032, FDR-p ≤ 0.024) were significantly associated with a longer disease duration and more severe disability.
Conclusions
In PRLs, the significant and clinically relevant neurite loss and increased soma fraction and size possibly reflect increased astrogliosis and activated microglia. Core-sign lesions exhibit milder axonal loss, microglia density and astrogliosis, supporting their less destructive nature
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