94 research outputs found
Agile isn’t just for Tech : aplicación de metodologías ágiles al área de gestión de talento
No full textFil: Laboudigue, Lucía Daniela. Universidad de San Andrés. Escuela de Negocios; Argentina.El presente trabajo de graduación tiene como objetivo principal generar un conjunto de recomendaciones para el rediseño de los procesos de Gestión de Talento en Power SA, cambiando de una gestión de Recursos Humanos tradicional a una gestión ágil. Para lograr dicho objetivo se desarrolla un estudio de caso en una organización, enfocando el análisis del proceso de la gestión del talento. A partir del diagnóstico de la gestión del talento en la empresa bajo estudio, se realiza la propuesta de intervención a partir de la metodología agile.
Metodológicamente, se desarrolla un estudio descriptivo en el cual se aplicaron entrevistas semiestructuradas a un grupo de siete lideres de la organización. Por otra parte, se aplicó la técnica del Benchmarking en 3 empresas, para el análisis comparativo de la gestión del talento.
Los principales resultados del estudio de caso indican que la gestión del talento de Power SA, presenta problemas como la falta de tiempo y conocimiento de los líderes para gestionar procesos de desarrollo; la falta de inversión en personal que se dediquen exclusivamente a la gestión del talento; problemas relacionados con la falta de feedback y objetivos a lo largo de todo el año, y desconocimiento de los ingresante acerca de los planes de carrera.
A partir de la identificación de dichos aspectos críticos se presenta una propuesta basada en la metodología ágil, en donde se presenta la creación de un modelo de liderazgo participativo, cambios en la gestión del desempeño, en los procesos de evaluación de desempeño y en los planes de carrera
Study of mechanisms affecting mobility of polycyclic aromatic hydrocarbons in contaminated fluvial sediments
No full textLa présente étude considère les conséquences sur la mobilité des HAP de trois actions face à un lit sédimentaire contaminé : l’absence d’action, l’ouverture du canal à la navigation et son curage. Pour ce faire, des profils de concentration en HAP libres dans la colonne sédimentaire et la colonne d’eau sont obtenus par le déploiement in situ de préleveurs passifs en plusieurs points du cours d’eau, dont l’un exposé à la navigation. Un suivi dans le temps est effectué, avant, pendant et après curage du cours d’eau. L’étude de l’impact de l’âge de la matrice sédimentaire et de l’activité micro-biologique sur le transfert de HAP vers la colonne d’eau est effectuée à travers une remise en suspension en conditions contrôlées. On constate alors que sur un tronçon homogène de colonne sédimentaire, la sorption des HAP augmente avec l’âge de la matrice. Cependant, dans le cas d’une discontinuité dans la nature de la matrice, de soudaines variations de concentrations en HAP libres peuvent survenir dans l’eau interstitielle, et une diffusion des HAP libres se met alors en place. Cette diffusion des HAP est plus sensible encore à l’interface eau-sediment, où on observe un transfert des HAP vers la colonne d’eau. La navigation diminue la couche limite de diffusion et renforce donc ces transferts. Le curage du lit sédimentaire quant à lui entraine un relargage massif de HAP libres dans la colonne d’eau. Ces HAP sont refixés par le matériel en suspension, mais cette re-fixation est précaire, les HAP pouvant être à nouveau libérés par la biodégradation du matériel en suspension assurant leur transport.This study presents the consequences, on PAH mobility, of 3 possible actions a watercourse administrator can take while facing a contaminated sedimentary bed: no action, the opening of the canal to navigation and its dredging. In this respect, concentration rates of free Polycyclic Aromatic Hydrocarbons have been obtained in the sedimentary column and in the water column by displaying passive samplers on different locations along the watercourse, one of them being exposed to navigation. A follow-up is made before, during and after the dredging of the watercourse. The impact of the age of the sedimentary matrix and of the microbiologic activity on the PAH transfer to the water column is studied through a remobilized sediment in batch experiments. It is then observed that the PAH sorption increases with the age of the matrix in one homogenous section of the sedimentary column. However, in case of a discontinuity in the matrix nature, sudden variations of free PAH concentration can occur in interstitial water. It results in a diffusion of free PAH. This PAH diffusion is even more sensitive to the water-sediment interface, on which we can observe a transfer of the PAH towards the water column. Navigation decreases the boundary layer and thus reinforces theses transfers.The dredging of the sediment bed results in a large release of free PAH in the water column. Those PAH are fixed again by the suspended material. Yet, this new fixation is frail : the PAH can be freed once more by the biodegradation of the suspended material transporting them
Interfaçage de PLMLatex avec le logiciel de gestion éditorial OJS: Mise en place d’un workflow éditorial collaboratif
No full textNational audienceMathrice est un réseau de métier des Administrateurs Système et Réseaux des laboratoires de recherche de mathématiques français. Le CNRS a formalisé Mathrice en groupement de service (GDS CNRS 2754 puis Réseau Thématique) en 2004. Ce RT est en charge de la Plateforme en Ligne des Mathématiques (PLM) qui compte plus de 5000 utilisateurs réguliers, répartis dans une centaine d'unités de recherche. Les Journées Mathrice sont une manifestation semestrielle itinérante, organisée par les membres du réseau. Elles se déroulent sur quatre demies-journées en milieu de semaine. Cette semaine est aussi l'occasion de réunir en présentiel les équipes de Mathrice (projets, exploitation de la PLM...)
Novel scenarios for sustainable waterway sediments management deduced from a decision-support tool
No full textInternational audienceIntroduction: Sediments accumulating in waterways represent a triple threat: for fluvial navigation, for flooding hazards, and for their pollutant contents. Waterways dredging releases millions of m3 of sediments, from which a large part is contaminated or even polluted enough to be considered as hazardous waste. Temporary or final storage on land is no longer a sustainable option. Methods: The GeDSeT decision support tool (DST) aims to provide sediment management options with quantitative data, in order to evaluate various scenarios taking into account cost and sustainability and consequently to highlight good practice. It allows to evaluate different scenarios of sediment management based on several indicators, in order to take into account all the consequences (effects, fig. 1) of the chosen options ("what-if" tools, [1]). As it is aimed at assessing all consequences of a chosen option (environmental, economic...), the tool is based on multicriteria analysis [2]. Results: Scenarios were developed using databases and focused research results [2] through discussions with operators, communities and industries [3]. Scenario 1: selective dredging is a 2-phase scheme in which pollution hotspots are removed before bulk dredging, to improve reusability of sediment (fig. 2). Scenario 2: on-site treatment implies processing as much as possible the sediment at a ship-borne plant. On-site dehydration benefits include output material with easier handling properties, and reduction of the dredged volume to be managed. Water can be returned to the waterway after treatment. Scenario 3: selective treatment refers to directing sediment loads to a treatment procedure adequate for their pollutant contents (inorganic and/or organic). This scenario is applicable to sediment treatment facilities currently developed near canals. Treatment may be aimed at reducing contamination under critical levels for less polluted sediments, or at concentrating the pollutants in a low volume fraction for safe disposal. Reusable sediment loads may be shipped to reuse sites. Scenario 4: alternative use of sediment Selectively dredged or treated sediments may be directed to reuse according to contamination level and regulatory constraints. Potential uses comprise: - bulk use where applicable (landfill cover, civil works, excavation backfill), - composite use (mix with concrete demolition aggregate), - use as an alternative mineral resource (cement production). Benefits include the reduction of primary minerals extraction and of sediment storage, hence increase of possible waterways dredging operations. Scenario 5: alternative use of disposal sites. Sediment deposits are highly vegetated due to abundant organic matter, but they are unfit for food crops. Their use for energy crops (wood pellets, seeds) would reduce undesirable land use and allow energy crops on fertile soil without competition for land with food crops. All these scenarios are aimed at increasing the reuse of sediments, and reducing their disposal as waste. Scenarios 1 and 3 require the availability of field analytical methods, currently in development. Discussion: The benefits of alternative and novel scenarios (environmental, land use, employment and economic activity) are not properly accounted for if dredging projects are evaluated through a tendering process. Benefits are identified by enlarging system boundaries [1]. The benefits of sediments reuse, at constant budget, are to reduce land pressure and to improve waterways maintenance, offering therefore more possibilities to sustainable fluvial transport. Acknowledgements: This research was supported by the European InterReg IV program, by the Walloon region of Belgium, by the French Ministry of Research, the Nord Pas de Calais region, and the French Waterways (VNF). References: [1] Lemière, B. et al. (2012) The GeDSeT project: constitution of a decision support tool (DST) for the management and material recovery of waterways sediments in Belgium and Northern France. WASCON, Göteborg, www.swedgeo.se/wascon2012. [2] Laboudigue, A., et al.., 2011. The GeDSeT Project: coupling multi-criteria analysis and knowledge improvement on sediment for a close-to-the-field Decision Support Tool. 7th International SedNet conference, Venice. [3] Lemière, B, et al. (2012) L'outil d'aide à la décision GeDSeT. Recyclage et Valorisation (Société de l'Industrie Minérale, Paris) 36, 52-58
Novel scenarios for sustainable waterway sediments management deduced from a decision-support tool
No full textInternational audienceIntroduction: Sediments accumulating in waterways represent a triple threat: for fluvial navigation, for flooding hazards, and for their pollutant contents. Waterways dredging releases millions of m3 of sediments, from which a large part is contaminated or even polluted enough to be considered as hazardous waste. Temporary or final storage on land is no longer a sustainable option. Methods: The GeDSeT decision support tool (DST) aims to provide sediment management options with quantitative data, in order to evaluate various scenarios taking into account cost and sustainability and consequently to highlight good practice. It allows to evaluate different scenarios of sediment management based on several indicators, in order to take into account all the consequences (effects, fig. 1) of the chosen options ("what-if" tools, [1]). As it is aimed at assessing all consequences of a chosen option (environmental, economic...), the tool is based on multicriteria analysis [2]. Results: Scenarios were developed using databases and focused research results [2] through discussions with operators, communities and industries [3]. Scenario 1: selective dredging is a 2-phase scheme in which pollution hotspots are removed before bulk dredging, to improve reusability of sediment (fig. 2). Scenario 2: on-site treatment implies processing as much as possible the sediment at a ship-borne plant. On-site dehydration benefits include output material with easier handling properties, and reduction of the dredged volume to be managed. Water can be returned to the waterway after treatment. Scenario 3: selective treatment refers to directing sediment loads to a treatment procedure adequate for their pollutant contents (inorganic and/or organic). This scenario is applicable to sediment treatment facilities currently developed near canals. Treatment may be aimed at reducing contamination under critical levels for less polluted sediments, or at concentrating the pollutants in a low volume fraction for safe disposal. Reusable sediment loads may be shipped to reuse sites. Scenario 4: alternative use of sediment Selectively dredged or treated sediments may be directed to reuse according to contamination level and regulatory constraints. Potential uses comprise: - bulk use where applicable (landfill cover, civil works, excavation backfill), - composite use (mix with concrete demolition aggregate), - use as an alternative mineral resource (cement production). Benefits include the reduction of primary minerals extraction and of sediment storage, hence increase of possible waterways dredging operations. Scenario 5: alternative use of disposal sites. Sediment deposits are highly vegetated due to abundant organic matter, but they are unfit for food crops. Their use for energy crops (wood pellets, seeds) would reduce undesirable land use and allow energy crops on fertile soil without competition for land with food crops. All these scenarios are aimed at increasing the reuse of sediments, and reducing their disposal as waste. Scenarios 1 and 3 require the availability of field analytical methods, currently in development. Discussion: The benefits of alternative and novel scenarios (environmental, land use, employment and economic activity) are not properly accounted for if dredging projects are evaluated through a tendering process. Benefits are identified by enlarging system boundaries [1]. The benefits of sediments reuse, at constant budget, are to reduce land pressure and to improve waterways maintenance, offering therefore more possibilities to sustainable fluvial transport. Acknowledgements: This research was supported by the European InterReg IV program, by the Walloon region of Belgium, by the French Ministry of Research, the Nord Pas de Calais region, and the French Waterways (VNF). References: [1] Lemière, B. et al. (2012) The GeDSeT project: constitution of a decision support tool (DST) for the management and material recovery of waterways sediments in Belgium and Northern France. WASCON, Göteborg, www.swedgeo.se/wascon2012. [2] Laboudigue, A., et al.., 2011. The GeDSeT Project: coupling multi-criteria analysis and knowledge improvement on sediment for a close-to-the-field Decision Support Tool. 7th International SedNet conference, Venice. [3] Lemière, B, et al. (2012) L'outil d'aide à la décision GeDSeT. Recyclage et Valorisation (Société de l'Industrie Minérale, Paris) 36, 52-58
Novel scenarios for sustainable waterway sediments management deduced from a decision-support tool
No full textInternational audienceIntroduction: Sediments accumulating in waterways represent a triple threat: for fluvial navigation, for flooding hazards, and for their pollutant contents. Waterways dredging releases millions of m3 of sediments, from which a large part is contaminated or even polluted enough to be considered as hazardous waste. Temporary or final storage on land is no longer a sustainable option. Methods: The GeDSeT decision support tool (DST) aims to provide sediment management options with quantitative data, in order to evaluate various scenarios taking into account cost and sustainability and consequently to highlight good practice. It allows to evaluate different scenarios of sediment management based on several indicators, in order to take into account all the consequences (effects, fig. 1) of the chosen options ("what-if" tools, [1]). As it is aimed at assessing all consequences of a chosen option (environmental, economic...), the tool is based on multicriteria analysis [2]. Results: Scenarios were developed using databases and focused research results [2] through discussions with operators, communities and industries [3]. Scenario 1: selective dredging is a 2-phase scheme in which pollution hotspots are removed before bulk dredging, to improve reusability of sediment (fig. 2). Scenario 2: on-site treatment implies processing as much as possible the sediment at a ship-borne plant. On-site dehydration benefits include output material with easier handling properties, and reduction of the dredged volume to be managed. Water can be returned to the waterway after treatment. Scenario 3: selective treatment refers to directing sediment loads to a treatment procedure adequate for their pollutant contents (inorganic and/or organic). This scenario is applicable to sediment treatment facilities currently developed near canals. Treatment may be aimed at reducing contamination under critical levels for less polluted sediments, or at concentrating the pollutants in a low volume fraction for safe disposal. Reusable sediment loads may be shipped to reuse sites. Scenario 4: alternative use of sediment Selectively dredged or treated sediments may be directed to reuse according to contamination level and regulatory constraints. Potential uses comprise: - bulk use where applicable (landfill cover, civil works, excavation backfill), - composite use (mix with concrete demolition aggregate), - use as an alternative mineral resource (cement production). Benefits include the reduction of primary minerals extraction and of sediment storage, hence increase of possible waterways dredging operations. Scenario 5: alternative use of disposal sites. Sediment deposits are highly vegetated due to abundant organic matter, but they are unfit for food crops. Their use for energy crops (wood pellets, seeds) would reduce undesirable land use and allow energy crops on fertile soil without competition for land with food crops. All these scenarios are aimed at increasing the reuse of sediments, and reducing their disposal as waste. Scenarios 1 and 3 require the availability of field analytical methods, currently in development. Discussion: The benefits of alternative and novel scenarios (environmental, land use, employment and economic activity) are not properly accounted for if dredging projects are evaluated through a tendering process. Benefits are identified by enlarging system boundaries [1]. The benefits of sediments reuse, at constant budget, are to reduce land pressure and to improve waterways maintenance, offering therefore more possibilities to sustainable fluvial transport. Acknowledgements: This research was supported by the European InterReg IV program, by the Walloon region of Belgium, by the French Ministry of Research, the Nord Pas de Calais region, and the French Waterways (VNF). References: [1] Lemière, B. et al. (2012) The GeDSeT project: constitution of a decision support tool (DST) for the management and material recovery of waterways sediments in Belgium and Northern France. WASCON, Göteborg, www.swedgeo.se/wascon2012. [2] Laboudigue, A., et al.., 2011. The GeDSeT Project: coupling multi-criteria analysis and knowledge improvement on sediment for a close-to-the-field Decision Support Tool. 7th International SedNet conference, Venice. [3] Lemière, B, et al. (2012) L'outil d'aide à la décision GeDSeT. Recyclage et Valorisation (Société de l'Industrie Minérale, Paris) 36, 52-58
Brownfields redevelopment in urban area : systemic communicational approach for the improvement of project owner's decision
No full textLes friches industrielles en milieu urbain représentent un grand potentiel de redéveloppement urbain mais l’aménagement sur les sites et sols polluées complexifie la prise de décision. Ces décisions sont basées sur des informations fournies par un grand nombre d’acteurs. Une méthode d’étude par la systémique communicationnelle a été retenue. Afin de modéliser ce système pour le réaménagement des friches industrielles, une méthodologie basée sur le retour d’expérience a été mise au point. Une grille a été construite dans le but de recueillir, pour chacune des sept phases des projets de réaménagement, les typologies d’acteurs, les typologies de données qu’ils acquièrent en urbanisme et en environnement et les problèmes que rencontrent ces acteurs. Enfin, un ensemble de règles permettant de modéliser l’évolution des données dans la dimension informationnelle a été défini. Les grilles de recueil ont été appliquées à trois terrains d’études. Une validation croisée des données par la méthode de triangulation en sciences humaines a été réalisée. Ces données a ensuite été utilisées pour modéliser le système communicationnel. Les résultats de la validation croisée ont montré que, les typologies d’acteurs et de données étaient fiables de par leur répétabilité. Cependant, des faiblesses ont été détectées en fin de projet : il a été difficile d’identifier les données utilisées. La structure du modèle a été étudiée et a montré que la structure des échanges était simple. Ensuite, les problèmes rencontrés par les différents acteurs ont été analysés. Ces problèmes sont principalement concentrés sur deux phases du projet : la première et la cinquième. Il a été démontré que les problèmes rencontrés sont liés à l’acquisition des données. Ce manque de données engendre des incertitudes pouvant remettre en cause le projet. En termes de perspectives, il faudrait réaliser des interviews complémentaires pour identifier les typologies manquantes en fin de projet.Brownfields in urban areas have great potential for redevelopment of cities, but urbanization on contaminated sites complicates decision making. The decisions are based on information provided by a lot of stakeholders. A method based on the systemic of communication was chosen. A methodology based on the feedback was developed to model this system of brownfield redevelopment. A grid was built in order to analyze in each stages of redevelopment projects: the types of involved stakeholders; the types of data they collect in urban planning and environment; and problems faced by these actors. Finally, a set of rules to model the evolution of the data in the informational dimension was defined. The collection grids were applied for three fields of study. Cross-validation of the data by the method of triangulation was achieved. All types of data was used to set up the communicational system. The model was established and its structure has been analyzed. This study showed that the pattern of trade between stakeholders was simple. Then, the problems found by stakeholders were studied. Problems were highlighted mainly into two stages: the first and fifth stages corresponding respectively to the beginning of conception of projects and the beginning of preparation works. The problems encountered are mostly related to the collection of data. This lack of data generate big uncertainty that could affect the project limiting the alternative scenarios. The results of cross-validation shown that the types of stakeholders and data are valid because of their repeatability. However, weaknesses were detected at the end of the project: it was difficult to identify the data which was used. Perspectives would require to make further interviews to identify missing typologies of data at the end of project
Impact of vegetation on the mobility and bioavailability of trace elements in a dredged sediment deposit: a greenhouse study
No full textIn France, high quantities of heavy metal contaminated sediments are
dredged each year and deposited on soils without any protection. Despite their high
pollutant content, a vegetal cover generally appears spontaneously on these
deposits. However, the growth of plants on the sediments can have an impact on the
heavy metal behaviour. In order to evaluate this impact, a greenhouse experimentation
was designed to measure the heavy metal (zinc, cadmium, lead, copper) mobilisation
during the growth of different vegetal species, and their absorption by vegetation.
The results indicate that high concentrations of heavy metals are absorbed by the
plants. Moreover, the establishment of a vegetal cover (maize, rape and rye grass) on
dredged sediments is able to quantitatively modify the physico-chemical parameters of
the sediments, and to increase the mobility of the heavy metals inside.Impact de l'installation d'un couvert végétal sur la mobilité de métaux
présents dans des sédiments de curage : étude en serre. En France, des quantités
importantes de sédiments contaminés par des polluants métalliques sont curées chaque
année, et déposées à même le sol sans précautions particulières. En dépit de leurs
concentrations élevées en métaux, ces dépôts se revégétalisent spontanément, ce qui
peut entraîner, à travers une évolution différente des caractéristiques
physicochimiques du sédiment, des changements de mobilité et de biodisponibilité des
métaux. Afin d'évaluer cet impact, une étude a été conduite en serre pour mesurer la
mobilisation des métaux lors de la culture de différentes espèces végétales ; maïs,
ray grass et colza. L'absorption des métaux par les différentes espèces a également
été suivie. Les résultats présentés dans cette étude montrent que des quantités
importantes de métaux sont absorbées par la végétation. Ils indiquent également que
l'installation d'un couvert végétal influe sur les caractéristiques physico-chimiques
de la matrice solide, induisant ainsi une augmentation de la mobilité des métaux
Behaviour of contaminated dredged sediment over time after land disposal : mechanistic approach of metal transfer in non saturated porous media
No full textL’entretien des cours d’eau génère des volumes conséquents de sédiments, qui, en zones urbanisées, sont souvent contaminés en métaux. Une fois curés, ces sédiments sont déposés à terre de façon pérenne ou transitoire ; se pose alors la question de leur impact environnemental. L’objectif de ce travail était d’évaluer l’évolution du potentiel mobilisable de métaux et les paramètres en jeu dans le vieillissement des dépôts. Ce dernier a été simulé en conditions contrôlées au laboratoire à l’aide de deux protocoles de vieillissement : le premier visant à simuler un dépôt en conditions drainantes, le second en conditions hydromorphes. La mise en solution des métaux et l’évolution de leur distribution dans les compartiments de la phase solide ont été suivies au cours du temps. La mise en dépôt provoque un départ rapide de Cd, Cu, As et Zn vers le compartiment matière organique, associations stables avec le vieillissement du dépôt sauf pour le Cd. Le transfert de Cd, Cu, As et Pb vers le compartiment oxyhydroxydes intervient plus tardivement et ces associations perdurent avec le temps. Seule l’association Zn-oxyhydroxydes est rapide mais elle est instable au cours du temps. Le compartiment acido-soluble devient rapidement prépondérant pour le Zn, le Cd et le Pb suite à la mise en dépôt et le reste avec le vieillissement. Les conditions de dépôt ont un impact mineur durant les premiers temps suivant la mise à terre. Par contre, avec le temps de dépôt, les conditions d’hydromorphie entraînent un départ de quantités plus élevées de Cd, Cu et Zn vers les eaux de drainage et dans le compartiment échangeable du sédiment par rapport au dépôt en conditions drainantes.Canal dredging generates high volumes of sediments which are often heavily contaminated with metals, especially in industrialized zones. Dredged sediments are usually deposited on land for long or temporary periods, and may impact surrounding environments. The aim of this study was to assess the potential of metal mobilisation during the ageing of sediment deposits. Sediment ageing was simulated in laboratory under controlled conditions with two protocols of wetting-drying : le first one simulated a sediment disposal in drained conditions and the second one hydromorphic conditions. The solubilisation of metals and their speciation in solid phase were followed over time. The distribution of metals was determined by selective dissolution. Sediment deposit on land leads to a fast transfer of Cd, Cu, As and Zn into the organic matter pool and these associations are stable with time excepted for Cd. The transfer of Cd, Cu, As and Pb into the oxyhydroxydes pool takes place later on following the disposal of sediment, excepted for the Zn-oxyhydroxides association, which is rapid but not stable with time. The acido-soluble pool becomes rapidly predominant for Zn, Cd and Pb after the sediment disposal and persists over time. Deposit conditions have no impact during the first time of the deposit. But, with time, hydromorphic conditions lead to a transfer of higher quantities of Cd, Cu and Zn into draining water and into exchangeable positions than the deposit in drained conditions
- …
