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| Registros recuperados: 28 | |
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| AMARAL, B. F.; CHINO, D. Y.; ROMANI, L. A. S.; GONÇALVES, R. R. V.; SOUSA, E. P. M. de; TRAINA, A. J. M.. |
| Resumo. O impacto causado por eventos climáticos extremos em todo o mundo tem motivado pesquisas para redução de gases de efeito estufa. No Brasil, a cana-de-açúcar é a principal fonte para produção de etanol, como alternativa a combustíveis fósseis. Nesse contexto, dados de sensoriamento remoto têm sido utilizados para monitorar safras de cana-de-açúcar e apoiar pesquisas científicas. Neste trabalho, é proposta uma metodologia baseada em agrupamento de dados para analisar séries temporais de NDVI obtidas de satélites AVHRR/NOAA. Os experimentos mostram que a abordagem proposta permite identificar áreas com padrões de desenvolvimento similares, considerando também os diferentes ciclos de vida da cultura. |
| Tipo: Artigo em anais de congresso (ALICE) |
Palavras-chave: Mineração de dados; Safras de cana-de-açúcar; Análise de séries temporais; Clusterização; Sugarcane; Time series analysis; Clustering. |
| Ano: 2011 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/898217 |
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| Finardi, Corrado; Arfini, Filippo; Turrini, Aida. |
| The present study intends to shed light, both from a descriptive and investigative point of view on the dietary evolution taking place in Europe during last 45 years, using secondary data from FAO FBS, which can cover the entire time span considered and allow for several extrapolation and timeseries analysis, differently than single survey data.. After a clustering of selected european national diets, using specific metrics with respect both to internal and external variety (as measured by appropriate indicators), we intended to check the actual distance that average, national diets have in front of the so called Food Pyramid, which consists in a balance of several food items in adequate proportions and in fact glorifies the healthy virtues of the... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Diets; Evolution; Clustering; Food pyramid; Europe; Trade; GI; Agricultural and Food Policy; Consumer/Household Economics; Demand and Price Analysis; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Health Economics and Policy; E37; Q18. |
| Ano: 2010 |
URL: http://purl.umn.edu/116443 |
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| Giraud, Georges; Lebecque, Annick; Amblard, Corinne; Bord, Cecile; Sulmont-Rosse, Claire; Lefur, Yves. |
| The paradigm of knowledge-based economy states that information asymmetry between consumers and producers will be reduced thanks to information availability and dissemination through the Internet or other media channels. Conversely to this statement, some published articles shown that knowledge-based economy reinforces the information asymmetry between experts and novices among the consumers (Hogg et al., 2007; Gregan-Paxton & Roedder-John, 1997; Alba & Hutchinson, 1987). Accordingly, we will consider the non homogeneity of consumers and will try to identify and qualify the differences between several groups of respondents regarding two food items by means of a k-means clustering applied to a knowledge-oriented questionnaire. |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Consumer Knowledge; Clustering; Wine; Cheese; France; Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Industrial Organization. |
| Ano: 2008 |
URL: http://purl.umn.edu/49848 |
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| Chen, Zhuo; Cho, Seong-Hoon; Poudyal, Neelam C.; Roberts, Roland K.. |
| This research evaluated forecasting accuracy of hedonic price models based on a number of different submarket assumptions. Using home sale data for the City of Knoxville and vicinities merged with geographic information, we found that forecasting housing prices with submarkets defined using expert knowledge and by school district and combining information conveyed in different modeling strategies are more accurate and efficient than models that are spatially aggregated, or with submarkets defined by statistical clustering techniques. This finding provided useful implications for housing price prediction in an urban setting and surrounding areas in that forecasting models based on expert knowledge of market structure or public school quality and simple... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Clustering; Forecasting; Hedonic price; Housing Submarket; Demand and Price Analysis; C53; R21. |
| Ano: 2007 |
URL: http://purl.umn.edu/9689 |
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| FREITAS, R. G.; MISSIO, R. F.; MATOS, F. S.; RESENDE, M. D. V. de; DIAS, L. A. S.. |
| Jatropha curcas, internationally and locally known, respectively, as physic nut and pinhão manso, is a highly promising species for biodiesel production in Brazil and other countries in the tropics. It is rustic, grows in warm regions and is easily cultivated. These characteristics and high-quality oil yields from the seeds have made this plant a priority for biodiesel programs in Brazil. Consequently, this species merits genetic investigations aimed at improving yields. Some studies have detected genetic variability in accessions in Africa and Asia. We have made the first genetic evaluation of J. curcas collected from Brazil. Our objective was to quantify genetic diversity and to estimate genetic parameters for growth and production traits and seed oil... |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Oil content; Genetic diversity; Heritability; Clustering; Genetic correlation. |
| Ano: 2011 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/897234 |
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| Lanctot, Jl; Legendre, P; Salvat, B. |
| The resistance to perturbations of reef-dwelling gastropod assemblages was studied on the seaward reefs of Fangataufa atoll (French Polynesia) after their exposure to atmospheric nuclear tests, a major man-made perturbation. We focused on two important aspects: (1) the temporal evolution of the densities of the most important species before and after the tests, and (2) the temporal evolution of the spatial structure of the assemblages. Three transects, crossing several geomorphological zones, were established on the seaward reefs of the atoll. Each transect was sampled at irregular time intervals during a twenty-year period. Several univariate and multivariate methods were used to study (1) the temporal fluctuations in species abundances and ranks, and (2)... |
| Tipo: Text |
Palavras-chave: Atmospheric nuclear tests; Clustering; Coral reefs; Gastropods; Perturbation. |
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/00093/20394/18061.pdf |
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| Gailhard-rocher, Isabelle; Huret, Martin; Lazure, Pascal; Vandermeirsch, Frederic; Gatti, Julie; Garreau, Pierre; Gohin, Francis. |
| Dans le contexte de l’évaluation initiale des eaux communautaires demandée par la Directive cadre stratégie pour le milieu marin (DCSMM), les états membres sont chargés de décrire les types d’habitats dominants de la colonne d’eau pour chaque sous-région marine. La présente étude s’inscrit dans ce contexte et a pour objectif de décrire les principales structures hydrologiques de la colonne d’eau. Sur la base des données existantes et des travaux antérieurs, il s’agit de classer les masses d'eau en fonction de critères physiques (température, salinité, turbidité, stratification), reconnus d’intérêt pour les espèces pélagiques et l’écosystème en général, et ainsi de définir une cartographie de l’habitat pélagique moyen. Les données utilisées correspondent... |
| Tipo: Text |
Palavras-chave: DCSMM; Habitat pélagique; Classification; Indices hydrologiques; Distribution des espèces; KeywordsMSFD; Pelagic Habitat; Clustering; Hydrological indices; Species distribution. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00069/18018/15547.pdf |
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| Osei, Edward. |
| Alternative manure application rates represent an integral part of current nutrient management efforts on animal feeding operations (AFOs). Previous studies have indicated that lower manure application rates tend to increase farm production costs. In this study, the Comprehensive Economic and Environmental Optimization Tool - Macro Modeling System (CEEOT-MMS) was used to evaluate the farm-level economic implications of alternative manure application rates for all AFOs in the 48 contiguous states of the U.S. Representative farms derived through statistical disaggregation of national databases and K-means clustering were simulated within the the Farm-level Economic Model (FEM) to determine the economic impacts of four manure application rates. The highest... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: FEM; CEEOT-MMS; Animal feeding operations; Clustering; Costs; Manure; Phosphorus; Crop Production/Industries. |
| Ano: 2008 |
URL: http://purl.umn.edu/6240 |
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| Axalan, Jerick T.; Murray-Prior, Roy B.; Concepcion, Sylvia B.; Lamban, Ruby Jane G.; Real, Rodel R.; Montiflor, Marilou O.; Batt, Peter J.; Rola-Rubzen, Maria Fay; Bacus, Recarte H.; Israel, Floro T.; Apara, Dante A.. |
| Effective relationship among partners is a key in strengthening collaborative marketing efforts. One of the collaborative marketing efforts is through clustering of farmer to link into market. This study examined the level of relationship of vegetable cluster farmers with their market intermediaries - cluster and the downstream buyers. A total of 81 vegetables farmers in Southern Philippines were surveyed to determine their relationship level on trust, power-dependence, relationship-specific investments and satisfaction. Comparison between clusters and downstream buyers were made using ANOVA and Welch Test. The study found that farmers have high level of trust to their clusters compared to their downstream buyers. The high level of trust is attributed to... |
| Tipo: Presentation |
Palavras-chave: Trust; Relationships; Vegetable; Clustering; Southern Philippines; Marketing. |
| Ano: 2012 |
URL: http://purl.umn.edu/124222 |
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| Registros recuperados: 28 | |
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