953 resultados para Pca


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Principal Component Analysis (PCA) is a popular method for dimension reduction that can be used in many fields including data compression, image processing, exploratory data analysis, etc. However, traditional PCA method has several drawbacks, since the traditional PCA method is not efficient for dealing with high dimensional data and cannot be effectively applied to compute accurate enough principal components when handling relatively large portion of missing data. In this report, we propose to use EM-PCA method for dimension reduction of power system measurement with missing data, and provide a comparative study of traditional PCA and EM-PCA methods. Our extensive experimental results show that EM-PCA method is more effective and more accurate for dimension reduction of power system measurement data than traditional PCA method when dealing with large portion of missing data set.

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BACKGROUND The value of radical prostatectomy (RP) as an approach for very high-risk prostate cancer (PCa) patients is controversial. To examine the risk of 10-year cancer-specific mortality (CSM) and other-cause mortality (OCM) according to clinical and pathological characteristics of very high-risk cT3b/4 PCa patients treated with RP as the primary treatment option. METHODS In a multi-institutional cohort, 266 patients with very high-risk cT3b/4 PCa treated with RP were identified. All patients underwent RP and pelvic lymph-node dissection. Competing-risk analyses assessed 10-year CSM and OCM before and after stratification for age and Charlson comorbidity index (CCI). RESULTS Overall, 34 (13%) patients died from PCa and 73 (28%) from OCM. Ten-year CSM and OCM rates ranged from 5.6% to 12.9% and from 10% to 38%, respectively. OCM was the leading cause of death in all subgroups. Age and comorbidities were the main determinants of OCM. In healthy men, CSM rate did not differ among age groups (10-year CSM rate for ⩽64, 65-69 and ⩾70 years: 16.2%, 11.5% and 17.1%, respectively). Men with a CCI ⩾1 showed a very low risk of CSM irrespective of age (10-year CSM: 5.6-6.1%), whereas the 10-year OCM rates increased with age up to 38% in men ⩾70 years. CONCLUSION Very high-risk cT3b/4 PCa represents a heterogeneous group. We revealed overall low CSM rates despite the highly unfavorable clinical disease. For healthy men, CSM was independent of age, supporting RP even for older men. Conversely, less healthy patients had the highest risk of dying from OCM while sharing very low risk of CSM, indicating that this group might not benefit from an aggressive surgical treatment. Outcome after RP as the primary treatment option in cT3b/4 PCa patients is related to age and comorbidity status.

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A partir del golpe de Estado de marzo de 1976 el Partido Comunista argentino (PCA) impulsó la política de "convergencia cívico-militar", una coalición amplia para frenar el avance del "fascismo" o "pinochetismo" dentro de la Junta Militar. Esta posición no era nueva sino que reactualizaba las caracterizaciones elaboradas en los meses previos porque, para el PCA, el golpe no inauguraba una nueva dictadura. En el presente artículo analizamos cómo esta línea, elaborada en el seno del Comité Central, fue recibida, interpretada, elaborada y materializada en prácticas por parte de la militancia comunista. El propósito de esta indagación es contestar por qué los militantes reprodujeron las posturas partidarias, a pesar de que para muchos, más temprano o más tarde, comenzó a resultar evidente que el plan represivo era sostenido por el conjunto de las Fuerzas Armadas y que las caracterizaciones del partido no se ajustaban a la realidad

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A partir del golpe de Estado de marzo de 1976 el Partido Comunista argentino (PCA) impulsó la política de "convergencia cívico-militar", una coalición amplia para frenar el avance del "fascismo" o "pinochetismo" dentro de la Junta Militar. Esta posición no era nueva sino que reactualizaba las caracterizaciones elaboradas en los meses previos porque, para el PCA, el golpe no inauguraba una nueva dictadura. En el presente artículo analizamos cómo esta línea, elaborada en el seno del Comité Central, fue recibida, interpretada, elaborada y materializada en prácticas por parte de la militancia comunista. El propósito de esta indagación es contestar por qué los militantes reprodujeron las posturas partidarias, a pesar de que para muchos, más temprano o más tarde, comenzó a resultar evidente que el plan represivo era sostenido por el conjunto de las Fuerzas Armadas y que las caracterizaciones del partido no se ajustaban a la realidad

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A partir del golpe de Estado de marzo de 1976 el Partido Comunista argentino (PCA) impulsó la política de "convergencia cívico-militar", una coalición amplia para frenar el avance del "fascismo" o "pinochetismo" dentro de la Junta Militar. Esta posición no era nueva sino que reactualizaba las caracterizaciones elaboradas en los meses previos porque, para el PCA, el golpe no inauguraba una nueva dictadura. En el presente artículo analizamos cómo esta línea, elaborada en el seno del Comité Central, fue recibida, interpretada, elaborada y materializada en prácticas por parte de la militancia comunista. El propósito de esta indagación es contestar por qué los militantes reprodujeron las posturas partidarias, a pesar de que para muchos, más temprano o más tarde, comenzó a resultar evidente que el plan represivo era sostenido por el conjunto de las Fuerzas Armadas y que las caracterizaciones del partido no se ajustaban a la realidad

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We provide high-resolution sea surface temperature (SST) and paleoproductivity data focusing on Termination 1. We describe a new method for estimating SSTs based on multivariate statistical analyses performed on modern coccolithophore census data, and we present the first downcore reconstructions derived from coccolithophore assemblages at Ocean Drilling Project (ODP) Site 1233 located offshore Chile. We compare our coccolithophore SST record to alkenone-based SSTs as well as SST reconstructions based on dinoflagellates and radiolaria. All reconstructions generally show a remarkable concordance. As in the alkenone SST record, the Last Glacial Maximum (LGM, 19-23 kyr B.P.) is not clearly defined in our SST reconstruction. After the onset of deglaciation, three major warming steps are recorded: from 18.6 to 18 kyr B.P. (~2.6°C), from 15.7 to 15.3 kyr B.P. (~2.5°C), and from 13 to 11.4 kyr B.P. (~3.4°C). Consistent with the other records from Site 1233 and Antarctic ice core records, we observed a clear Holocene Climatic Optimum (HCO) from ~8-12 kyr B.P. Combining the SST reconstruction with coccolith absolute abundances and accumulation rates, we show that colder temperatures during the LGM are linked to higher coccolithophore productivity offshore Chile and warmer SSTs during the HCO to lower coccolithophore productivity, with indications of weak coastal upwelling. We interpret our data in terms of latitudinal displacements of the Southern Westerlies and the northern margin of the Antarctic Circumpolar Current system over the deglaciation and the Holocene.