Architectures for Context Aware Services in Smart Environments

This thesis deals with Context Aware Services, Smart Environments, Context Management and solutions for Devices and Service Interoperability. Multi-vendor devices offer an increasing number of services and end-user applications that base their value on the ability to exploit the information originating from the surrounding environment by means of an increasing number of embedded sensors, e.g. GPS, compass, RFID readers, cameras and so on. However, usually such devices are not able to exchange information because of the lack of a shared data storage and common information exchange methods. A large number of standards and domain specific building blocks are available and are heavily used in today's products. However, the use of these solutions based on ready-to-use modules is not without problems. The integration and cooperation of different kinds of modules can be daunting because of growing complexity and dependency. In this scenarios it might be interesting to have an infrastructure that makes the coexistence of multi-vendor devices easy, while enabling low cost development and smooth access to services. This sort of technologies glue should reduce both software and hardware integration costs by removing the trouble of interoperability. The result should also lead to faster and simplified design, development and, deployment of cross-domain applications. This thesis is mainly focused on SW architectures supporting context aware service providers especially on the following subjects: - user preferences service adaptation - context management - content management - information interoperability - multivendor device interoperability - communication and connectivity interoperability Experimental activities were carried out in several domains including Cultural Heritage, indoor and personal smart spaces – all of which are considered significant test-beds in Context Aware Computing. The work evolved within european and national projects: on the europen side, I carried out my research activity within EPOCH, the FP6 Network of Excellence on “Processing Open Cultural Heritage” and within SOFIA, a project of the ARTEMIS JU on embedded systems. I worked in cooperation with several international establishments, including the University of Kent, VTT (the Technical Reserarch Center of Finland) and Eurotech. On the national side I contributed to a one-to-one research contract between ARCES and Telecom Italia. The first part of the thesis is focused on problem statement and related work and addresses interoperability issues and related architecture components. The second part is focused on specific architectures and frameworks: - MobiComp: a context management framework that I used in cultural heritage applications - CAB: a context, preference and profile based application broker which I designed within EPOCH Network of Excellence - M3: "Semantic Web based" information sharing infrastructure for smart spaces designed by Nokia within the European project SOFIA - NoTa: a service and transport independent connectivity framework - OSGi: the well known Java based service support framework The final section is dedicated to the middleware, the tools and, the SW agents developed during my Doctorate time to support context-aware services in smart environments.

Micro-simulation models at neighbourhood scale: the interplay of agents, buildings, activities and transport.

Urban systems consist of several interlinked sub-systems - social, economic, institutional and environmental – each representing a complex system of its own and affecting all the others at various structural and functional levels. An urban system is represented by a number of “human” agents, such as individuals and households, and “non-human” agents, such as buildings, establishments, transports, vehicles and infrastructures. These two categories of agents interact among them and simultaneously produce impact on the system they interact with. Try to understand the type of interactions, their spatial and temporal localisation to allow a very detailed simulation trough models, turn out to be a great effort and is the topic this research deals with. An analysis of urban system complexity is here presented and a state of the art review about the field of urban models is provided. Finally, six international models - MATSim, MobiSim, ANTONIN, TRANSIMS, UrbanSim, ILUTE - are illustrated and then compared.

Bestimmung der fehlenden transversalen Energie auf der ersten Triggerstufe beim ATLAS-Experiment und Optimierung der Triggerselektion von supersymmetrischen Ereignissen

Das Standardmodell der Teilchenphysik, das drei der vier fundamentalen Wechselwirkungen beschreibt, stimmt bisher sehr gut mit den Messergebnissen der Experimente am CERN, dem Fermilab und anderen Forschungseinrichtungen überein. rnAllerdings können im Rahmen dieses Modells nicht alle Fragen der Teilchenphysik beantwortet werden. So lässt sich z.B. die vierte fundamentale Kraft, die Gravitation, nicht in das Standardmodell einbauen.rnDarüber hinaus hat das Standardmodell auch keinen Kandidaten für dunkle Materie, die nach kosmologischen Messungen etwa 25 % unseres Universum ausmacht.rnAls eine der vielversprechendsten Lösungen für diese offenen Fragen wird die Supersymmetrie angesehen, die eine Symmetrie zwischen Fermionen und Bosonen einführt. rnAus diesem Modell ergeben sich sogenannte supersymmetrische Teilchen, denen jeweils ein Standardmodell-Teilchen als Partner zugeordnet sind.rnEin mögliches Modell dieser Symmetrie ist das R-Paritätserhaltende mSUGRA-Modell, falls Supersymmetrie in der Natur realisiert ist.rnIn diesem Modell ist das leichteste supersymmetrische Teilchen (LSP) neutral und schwach wechselwirkend, sodass es nicht direkt im Detektor nachgewiesen werden kann, sondern indirekt über die vom LSP fortgetragene Energie, die fehlende transversale Energie (etmiss), nachgewiesen werden muss.rnrnDas ATLAS-Experiment wird 2010 mit Hilfe des pp-Beschleunigers LHC mit einer Schwerpunktenergie von sqrt(s)=7-10 TeV mit einer Luminosität von 10^32 #/(cm^2*s) mit der Suche nach neuer Physik starten.rnDurch die sehr hohe Datenrate, resultierend aus den etwa 10^8 Auslesekanälen des ATLAS-Detektors bei einer Bunchcrossingrate von 40 MHz, wird ein Triggersystem benötigt, um die zu speichernde Datenmenge zu reduzieren.rnDabei muss ein Kompromiss zwischen der verfügbaren Triggerrate und einer sehr hohen Triggereffizienz für die interessanten Ereignisse geschlossen werden, da etwa nur jedes 10^8-te Ereignisse für die Suche nach neuer Physik interessant ist.rnZur Erfüllung der Anforderungen an das Triggersystem wird im Experiment ein dreistufiges System verwendet, bei dem auf der ersten Triggerstufe mit Abstand die höchste Datenreduktion stattfindet.rnrnIm Rahmen dieser Arbeit rn%, die vollständig auf Monte-Carlo-Simulationen basiert, rnist zum einen ein wesentlicher Beitrag zum grundlegenden Verständnis der Eigenschaft der fehlenden transversalen Energie auf der ersten Triggerstufe geleistet worden.rnZum anderen werden Methoden vorgestellt, mit denen es möglich ist, die etmiss-Triggereffizienz für Standardmodellprozesse und mögliche mSUGRA-Szenarien aus Daten zu bestimmen. rnBei der Optimierung der etmiss-Triggerschwellen für die erste Triggerstufe ist die Triggerrate bei einer Luminosität von 10^33 #/(cm^2*s) auf 100 Hz festgelegt worden.rnFür die Triggeroptimierung wurden verschiedene Simulationen benötigt, bei denen eigene Entwicklungsarbeit eingeflossen ist.rnMit Hilfe dieser Simulationen und den entwickelten Optimierungsalgorithmen wird gezeigt, dass trotz der niedrigen Triggerrate das Entdeckungspotential (für eine Signalsignifikanz von mindestens 5 sigma) durch Kombinationen der etmiss-Schwelle mit Lepton bzw. Jet-Triggerschwellen gegenüber dem bestehenden ATLAS-Triggermenü auf der ersten Triggerstufe um bis zu 66 % erhöht wird.

How Do We Teach Economics?

The teaching of economics in Hungary has changed fundamentally since the 1980s for two main reasons. Firstly, the transformation towards a market economy has changed the needs of students, and secondly, there has been a move to harmonise Hungarian methods of teaching with Western ones. The number of institutions involved in economics education has increased substantially to meet new demand and these institutions offer a wide range of programs, though the topics covered tend to be more practically based than previously. A survey of students set out to evaluate economics as a profession by investigating social esteem, financial compensation, career prospects, and mobility within the profession. Amongst full-time students there was a strong correlation between the parents' background and the students' career prospects. Full-time students were more optimistic than part-time students, although the latter had a higher opinion of the academic level of their educational establishments. A second survey, this time of economics teachers, revealed the disturbing fact that teachers rated themselves in the last but one position according to social esteem and felt that society had a poor opinion of them. Fifty percent expressed a desire to leave the profession and 70% supplemented their income with work outside their school, rarely within the domain of economics. The final part of the research analysed the situation in private educational institutions, nothing that unemployment retraining grants offered by the Ministry of Labour have created an incentive for private entrepreneurs to organise courses and that the quality of these courses varies considerably.

A manifesto for an e-lending limitation in copyright

In the European Union, lending is an exclusive right for copyright and related rights, but Member States can transform public lending to a right of remuneration and even exempt some establishments from any payment. The making available of works online is not covered by the public lending right regime of the Rental and Lending Directive but is considered as an act of making available governed by the InfoSoc Directive. As a consequence, libraries are currently not allowed to digitally transmit works to their patrons as lending, but have entered into licenses with publishers to develop an offer of lending of e-books, also called e-lending, with the intermediation of dedicated platforms operated by commercial actors. Compared to physical lending, e-lending is not based on ownership of the book by libraries but on its provision by this intermediary. This paper discusses how the objective of enabling libraries to engage in e-lending should be achieved, and what is the proper dividing line between a market-based solution, as developing today, and a limitation to exclusive rights. The impact of an extension of the public lending right to e-lending should be assessed, but not based on a criterion of direct substitution of a book on loan at the library to a book bought at a retailer. By definition, libraries are substitutes to normal trade. Instead, the overall effect of lending to the commercialisation of books and other works should be verified. Particular conditions for a limitation in favour of lending are also addressed, and notably the modalities of lending (a limited duration, one simultaneous user per title, …), not to make e-lending through libraries easier and preferable to the normal acquisition of an e-book. This paper argues in favour of some and controlled extension of the public lending right to cover the lending of e-books and other digital content. For the role of libraries is essential in providing access to works and culture to readers who would or could not rely only on normal acquisition of books or other items on the market, to works that are not provided by the market, and to material for research. Libraries are a third sector providing access to works, aside the market and non-market exchanges between individuals. This role should not lose its relevance in the digital context, or it would culturally impoverish future generations of readers.

Smoke free restaurant ordinance, compliance with the regulation to reduce exposure to environmental tobacco smoke while dining at local restaurants in San Antonio, Texas

This study is a secondary analysis of a survey developed by Dr. Jimmy Perkins and administered by San Antonio/Bexar County Metropolitan Health District. The survey was developed subsequent to the implementation of the city smoking ordinance effective January 1, 2004. The survey had a multi-purpose plan to establish the number of restaurants having smoke free status prior to and following the ordinance, determine compliance as it relates to a necessary smoking section and proper signage, and expose the rationale for restaurants to become smoke free. The data resulting from the survey was presented to the San Antonio/Bexar County Metropolitan Health District. The summary presented the types of establishments surveyed, smoking status of the establishment, reasons for the establishment becoming smoke free, compliance with smoking sections, compliance with signage requirements, awareness of ordinance, and chain status of the establishment. ^ The results of this study display the relationships among the variables previously mentioned. The following relationships have been examined and the outcomes have determined whether each is significant. After careful analysis, knowledge translates into compliance with signage regulations, which then translate into ordinance compliance. Size does matter as it relates to an establishment's number of employees and seating capacity. The smaller the establishment the more likely the establishment is to have become smoke free before the ordinance went into effect. Restaurants, rather than fast food establishments most commonly cited their reason for becoming smoke free was to comply with the ordinance and only ten percent of restaurants gave policy as the main reason for becoming smoke free. ^ This study is important for public health because the negative health effects of environmental tobacco smoke (ETS) are still an overwhelming problem in the United States (3). ETS is a Known Human Group A Carcinogen (5). The Environmental Protection Agency (EPA) has estimated that around 3,000 non-smoking Americans die every year from lung cancer caused by ETS (6). This information illustrates the importance of providing smoke free establishments, especially to non-smoking patrons. ^

Environmental tobacco smoke exposure, respiratory and cardiovascular health in restaurant and bar workers in Mexico

Environmental tobacco smoke (ETS) is a well established health hazard, being causally associated to lung cancer and cardiovascular disease. ETS regulations have been developed worldwide to reduce or eliminate exposure in most public places. Restaurants and bars constitute an exception. Restaurants and bar workers experience the highest ETS exposure levels across several occupations, with correspondingly increased health risks. In Mexico, previous exposure assessment in restaurants and bars showed concentrations in bars and restaurants to be the highest across different public and workplaces. Recently, Mexico developed at the federal level the General Law for Tobacco Control restricting indoors smoking to separated areas. AT the local level Mexico City developed the Law for the Protection of Non-smokers Health, completely banning smoking in restaurants and bars. Studies to assess ETS exposure in restaurants and bars, along with potential health effects were required to evaluate the impact of these legislative changes and to set a baseline measurement for future evaluations.^ A large cross-sectional study conducted in restaurants and bars from four Mexican cities was conducted from July to October 2008, to evaluate the following aims: Aim 1) Explore the potential impact of the Mexico City ban on ETS concentrations through comparison of Mexico City with other cities. Aim 2). Explore the association between ETS exposure, respiratory function indicators and respiratory symptoms. Aim 3). Explore the association between ETS exposure and blood pressure and heart rate.^ Three cities with no smoking ban were selected: Colima (11.5% smoking prevalence), Cuernavaca (21.5% smoking prevalence) and Toluca (27.8% smoking prevalence). Mexico City (27.9% smoking prevalence), the only city with a ban at the time of the study, was also selected. Restaurants and bars were randomly selected from municipal records. A goal of 26 restaurants and 26 bars per city was set, 50% of them under 100 m2. Each establishment was visited during the highest occupancy shift, and managers and workers answered to a questionnaire. Vapor-phase nicotine was measured using passive monitors, that were activated at the beginning and deactivated at the end of the shift. Also, workers participated at the beginning and end of the shift in a short physical evaluation, comprising the measurement of Forced Expiratory Volume in the first second (FEV1) and Peak Expiratory Flow (PEF), as well as blood pressure and heart rate.^ A total of 371 establishments were invited, 219 agreed to participate for a 60.1% participation rate. In them, 828 workers were invited, 633 agreed to participate for a 76% participation rate. Mexico City had at least 4 times less nicotine compared to any of the other cities. Differences between Mexico City and other cities were not explained by establishment characteristics, such as ventilation or air extraction. However, differences between cities disappeared when ban mechanisms, such as policy towards costumer's smoking, were considered in the models. An association between ETS exposure and respiratory symptoms (cough OR=1.27, 95%CI=1.04, 1.55) and respiratory illness (asthma OR=1.97, 95%CI=1.20, 3.24; respiratory illness OR=1.79, 95%CI=1.10, 2.94) was observed. No association between ETS and phlegm, wheezing or respiratory infections was observed. No association between ETS and any of the spirometric indicators was observed. An association between ETS exposure and increased systolic and diastolic blood pressure at the end of the shift was observed among non-smokers (systolic blood pressure beta=1.51, 95%CI=0.44, 2.58; diastolic blood pressure beta=1.50, 95%CI=0.72, 2.28). The opposite effect was observed in heavy smokers, were increased ETS exposure was associated with lower blood pressure at the end of the shift (systolic blood pressure beta=1.90, 95%CI=-3.57, -0.23; diastolic blood pressure beta=-1.46, 95%CI=-2.72, -0.02). No association in light smokers was observed. No association for heart rate was observed. ^ Results from this dissertation suggest Mexico City's smoking ban has had a larger impact on ETS exposure. Ventilation or air extraction, mechanisms of ETS control suggested frequently by tobacco companies to avoid smoking bans were not associated with ETS exposure. This dissertation suggests ETS exposure could be linked to changes in blood pressure and to increased respiratory symptoms. Evidence derived from this dissertation points to the potential negative health effects of ETS exposure in restaurants and bars, and provides support for the development of total smoking bans in this economic sector. ^

THE RECOVERY OF ENTEROPATHOGENS FROM CONTAMINATED COOKED FOODS AT HOLDING TEMPERATURES

Hot foods served in foodservice establishments, institutions and homes, have always been regarded as safe, since cooking temperatures are more likely to kill the bacterial agents that may cause foodborne diseases. However, foods that are otherwise served hot have been epidemiologically incriminated for causing foodborne diseases. This situation arises due to the possible post-cooking food contamination. Post-cooking contamination of hot-held food is most threatening for it gives the contaminating agents the possibility of proliferation. On one hand, post-cooking contamination is least understood and on the other, hot-holding of food gives the consumer a false sense of freedom from foodborne diseases. In this study, the dynamics of food contamination before or after cooking and during hot-holding are discussed and a food contamination dynamics model is presented.^ The literature on foodborne cholera, cholera-like diarrhea, shigellosis and E. coli gastroenteritis together with the literature on the occurrence and growth of the causative enteropathogens; 01 V. cholerae, non-01 V. cholerae, S. sonnei, S. flexneri and E. coli were reviewed. The literature on the infective doses of these organisms were also cited.^ In the study, four cooked food types held hot at 40-60(DEGREES)C were deliberately contaminated with 01 V. cholerae, non-01 V. cholerae, S. sonnei, S. flexneri and E. coli, one at a time at each of the hot-holding temperatures. Tested food samples for the recovery of these enteropathogens were withdrawn at various time intervals of hot holding.^ The results showed bacterial recovery to decline with increasing temperature and with increasing hot-holding time within each holding temperature. All the bacterial types except V. cholerae were recovered even after holding the food at 60(DEGREES)C for one hour. V. cholerae was not recovered after hot-holding the food at 50-60(DEGREES)C at certain holding periods. After 48 hrs incubation, V. cholerae was recovered on TCBS agar plates that read negative after the initial 24 hrs of incubation. Effective hot-holding temperatures were determined for each of the food types contaminated by each of the bacterial types.^ Statistical analysis of the collected data showed temperature, bacterial type and their interaction to be significant in enteropathogen recovery. Food type and its interactions with temperature and bacterial type were found not significant. ^

Disparities in foodborne illness in Harris County, Texas, 2005--2010

Using a retrospective cross-sectional approach, this study quantitatively analyzed foodborne illness data, restaurant inspection data, and census-derived socioeconomic and demographic data within Harris County, Texas between 2005 and 2010. The main research question investigated involved determining the extent to which contextual and regulatory conditions distinguish outbreak and non-outbreak establishments within Harris County. Two groups of Harris County establishments were analyzed: outbreak and non-outbreak restaurants. STATA 11 was employed to determine the average profiles of each category across both the regulatory and socioeconomic (contextual) variables. Cross tabulations of all of the non-quantitative variables were also performed, and finally, a discriminant analysis was conducted to assess how well the variables were able to allocate the restaurants into their respective categories. Contextual and regulatory conditions were found to be minimally associated with the occurrence of foodborne outbreaks within Harris County. Across both the categories (outbreak and non-outbreak establishments), variables included were extremely similar in means, and when possible to observe, distributions. The variables analyzed in this study, both regulatory and contextual, were not found to significantly allocate the establishments into their correct outbreak or non-outbreak categories. The implications of these findings are that regulatory processes and guidelines in place in Harris County do not effectively to distinguish outbreak from non-outbreak restaurants. Additionally, no socioeconomic or racial/ethnic patterns are apparent in the incidence of foodborne disease in the county. ^

Remediation of feedlot effluents using aquatic plants

Feedlots have increased in several regions of Argentina, particularly in the Pampas. The absence of adequate treatments of the effluents produced in these establishments creates serious problems to the society. Phytoremediation can be defined as inexpensive and environmentally sustainable strategy used to remove pollutants by plants. The aim of this study was to evaluate the remediation potential of two macrophyte species (Eichhornia crassipes and Hydrocotyle ranunculoides) on a feedlot effluent. This effluent was treated with these species for 31 days. Control and macrophyte treatments decreased dissolved inorganic nitrogen (DIN), Kjeldahl nitrogen (Kj N), biological oxygen demand (BOD), chemical oxygen demand (COD), total dissolved salts (TDS), total phosphorus (TP), Pb, Zn and Cr levels. At macrophyte treatments, relatively constant pH levels were kept and decreased EC and TDS values were obtained compared to control, mitigating the release of contaminants and potential greenhouse gases to the atmosphere. Moreover, significant increases in biomass were obtained, being higher in E. crassipes. The results allow concluding that the presence of aquatic plants increases the removal rates of nutrients, organic matter and heavy metals from wastewater in approximately 10-17 days for a feedlot effluent with high organic load.

La educación, base para el desarrollo y la seguridad a escala humana

Las teorías sobre el desarrollo son en realidad un dinámico debate acerca de la relación población/recursos, de las condiciones de inequidad a escala planetaria y al interior de las naciones, y de las formas de superarlas. Para avanzar hacia el desarrollo humano, es prioritario enfocar las acciones en la superación de las carencias que afectan la situación personal de los ciudadanos y eliminar los obstáculos que impiden su bienestar en relación con las condiciones medioambientales en las que transcurre su vida. La educación es comprendida como el eje fundamental para alcanzar niveles de desarrollo aceptables, asegurando superar situaciones de exclusión social. Sobre la base de encuestas en cuatro establecimientos educativos del Gran Mendoza, se analizan las relaciones existentes entre las representaciones, de los adolescentes y sus familias sobre la importancia de la educación como medio optimizador de las situaciones socioeconómicas y los proyectos de capacitación futura, tanto a nivel terciario como universitario.

Procedencia escolar de los aspirantes a la Facultad de Ciencias Médicas y su relación con el rendimiento en los exámenes de admisión

La selección de aspirantes para el ingreso a la carrera de Medicina y otras carreras de las Ciencias de la Salud es un tema de constante actualidad tanto en el ámbito nacional como internacional. La Facultad de Ciencias Médicas de la Universidad Nacional de Cuyo tiene un sistema selectivo a través de exámenes de contenidos del nivel de educación secundaria y ofrece un curso de nivelación de un semestre de duración. Se observa que un alto porcentaje de aspirantes no logran compensar la diferencia existente entre los conocimientos que poseen y los que demandan las carreras ofrecidas, únicamente mediante la preparación individual y la preparación que brinda la Facultad. El propósito de este estudio fue el de caracterizar a los aspirantes a las carreras de la Facultad de Ciencias Médicas, de acuerdo a los establecimientos de educación secundaria de procedencia, realizando un estudio retrospectivo de cinco años, sobre la base de datos de aspirantes a las tres carreras de la Facultad, clasificándolos según dicha procedencia y relacionando esa característica con su rendimiento en los exámenes de admisión. La mayoría de los aspirantes a las carreras de la Facultad de Ciencias Médicas proviene de establecimientos oficiales, seguido por establecimientos privados y en tercer lugar por establecimientos dependientes de la Universidad Nacional de Cuyo. El rendimiento en los exámenes de los aspirantes a Enfermería y Tecnicaturas fue independiente a la modalidad de la escuela secundaria. Para ingresar a la carrera de Medicina la modalidad Ciencias Naturales favorece el rendimiento en los exámenes. Del mismo modo, provenir de un colegio de la Universidad o de una escuela privada otorga mayores posibilidades de éxito. La Facultad de Ciencias Médicas realiza esfuerzos constantes, a través de la información sobre los requisitos de admisión y de su oferta de cursos de nivelación para lograr que los aspirantes lleguen con mejor preparación a las instancias de evaluación. Sin embargo, las características relacionadas con la formación previa de los aspirantes deben ser consideradas como factores vinculantes con sus posibilidades de ingresar.

El mundo del trabajo en la Argentina : Estrategias productivistas y resistencia obrera. El caso de la empresa metalúrgica Siam Di Tella [1935-1955]

El objetivo de la tesis es estudiar el mundo del trabajo y la dinámica de las relaciones sociales en las etapas 1935-1945 y 1945-1955, -especialmente en los años del peronismo- en la cual estuvieron involucrados empresarios y trabajadores de la actividad industrial. Se tomó como unidad de análisis la empresa Siam Di Tella; y como problemática principal se escogieron las relaciones/conflictos que el sector obrero estableció con el sector empresarial en aquellos aspectos referidos a las estrategias productivas, políticas e incluso educativas, diseñadas por los diferentes actores sociales participantes en la disputa por el control de la producción en el espacio fabril. Por ello, el eje principal de este trabajo estará centrado en la aplicación (empresarial) y en las resistencias (obreras) de aquellas políticas basadas en el disciplinamiento y control (taylorizacion y fordización) de la producción, así como las iniciativas de formación para los trabajadores en el marco del ámbito fabril, -particularmente en el campo técnico/educativo

Patrimonio y producción en las tierras de los betlemitas. Córdoba, 1600-1870

En este trabajo pretendemos aproximarnos al complejo mundo rural cordobés y observar otras formas de tenencias de la tierra, con sus prácticas de producción y trabajo, los diversos actores que se mueven dentro y fuera de la unidad, sus trayectorias personales y empresarias y las múltiples relaciones sociales que los vincularon. Procuraremos ampliar nuestra mirada hacia el contexto en que operaron en el marco regional e interregional. A los fines de comparar y observar los cambios y permanencias que se fueron dando, hemos acotado nuestra observación a un conjunto de establecimientos rurales que hacia finales del siglo XVIII pasó a ser administrado por la orden Betlemita y forman una unidad de producción que se puede seguir en el largo plazo, desde que se construye socialmente el espacio que ocupan, a fines del siglo XVI, hasta la segunda mitad del siglo XIX.

Las tierras, los ganados, los trabajadores... Una posible reconstrucción de las estancias reduccionales de la experiencia jesuítica bonaerense, 1740-1752

El presente trabajo propone reconstruir el sistema productivo organizado por los misioneros de la Compañía de Jesús al sur de la jurisdicción colonial de Buenos Aires, entre 1740 y 1752. Si bien los hombres de la Compañía desarrollaron durante el siglo XVIII establecimientos productivos en todas las regiones rioplatenses, la característica de este caso se refiere a que la estancias y chacras que son descriptas tienen una vida activa de 12 años en la frontera, es decir, en territorio indígena ocupado por la reducciones pero con un dominio colonial no consolidado. Los espacios fronterizos no son habitados permanentemente por los españoles y la dominación y control del Estado suelen ser esporádicos. Por tanto, la experiencia misional se transforma en un mecanismo que pretende vigilar y controlar, pero que para existir en un territorio cuyo dominio es detentado por otras sociedades debe negociar con las mismas sus condiciones de existencia. ¿Cómo afectó esta situación a la constitución de ┤chacras' y ┤estancias' productivas? ¿En qué medida estos establecimientos se integraron a la red de establecimientos que la Compañía posee en tierras ┤españolas'? ¿La organización es similar en el ámbito fronterizo y en el ámbito ┤efectivamente' colonizado?