On the exhaustiveness of truncation and dropping strategies in many-to-many matching markets

We consider two–sided many–to–many matching markets in which each worker may work for multiple firms and each firm may hire multiple workers. We study individual and group manipulations in centralized markets that employ (pairwise) stable mechanisms and that require participants to submit rank order lists of agents on the other side of the market. We are interested in simple preference manipulations that have been reported and studied in empirical and theoretical work: truncation strategies, which are the lists obtained by removing a tail of least preferred partners from a preference list, and the more general dropping strategies, which are the lists obtained by only removing partners from a preference list (i.e., no reshuffling). We study when truncation / dropping strategies are exhaustive for a group of agents on the same side of the market, i.e., when each match resulting from preference manipulations can be replicated or improved upon by some truncation / dropping strategies. We prove that for each stable mechanism, truncation strategies are exhaustive for each agent with quota 1 (Theorem 1). We show that this result cannot be extended neither to group manipulations (even when all quotas equal 1 – Example 1), nor to individual manipulations when the agent’s quota is larger than 1 (even when all other agents’ quotas equal 1 – Example 2). Finally, we prove that for each stable mechanism, dropping strategies are exhaustive for each group of agents on the same side of the market (Theorem 2), i.e., independently of the quotas.

Allocation rules on networks

When allocating a resource, geographical and infrastructural constraints have to be taken into account. We study the problem of distributing a resource through a network from sources endowed with the resource to citizens with claims. A link between a source and an agent depicts the possibility of a transfer from the source to the agent. Given the supplies at each source, the claims of citizens, and the network, the question is how to allocate the available resources among the citizens. We consider a simple allocation problem that is free of network constraints, where the total amount can be freely distributed. The simple allocation problem is a claims problem where the total amount of claims is greater than what is available. We focus on consistent and resource monotonic rules in claims problems that satisfy equal treatment of equals. We call these rules fairness principles and we extend fairness principles to allocation rules on networks. We require that for each pair of citizens in the network, the extension is robust with respect to the fairness principle. We call this condition pairwise robustness with respect to the fairness principle. We provide an algorithm and show that each fairness principle has a unique extension which is pairwise robust with respect to the fairness principle. We give applications of the algorithm for three fairness principles: egalitarianism, proportionality and equal sacrifice.

Soft budget constraints in a dynamic general equilibrium model

This paper considers an overlapping generations model in which capital investment is financed in a credit market with adverse selection. Lenders’ inability to commit ex-ante not to bailout ex-post, together with a wealthy position of entrepreneurs gives rise to the soft budget constraint syndrome, i.e. the absence of liquidation of poor performing firms on a regular basis. This problem arises endogenously as a result of the interaction between the economic behavior of agents, without relying on political economy explanations. We found the problem more binding along the business cycle, providing an explanation to creditors leniency during booms in some LatinAmerican countries in the late seventies and early nineties.

Un marco analítico de la discriminación laboral. Teorias, modalidades y estudios para Colombia

Este documento presenta un resumen de las principales corrientes teóricas que han tratado de dar una explicación a la discriminación laboral, asi como una exposición pedagógica de las principales modalidades mediante las cuales dicha discriminación se manifiesta. Se realiza un particular análisis de las consecuencias que dicha discriminación tiene, en particular para el caso de los jóvenes de América Latina, y finalmente se realiza una revisión de los estudios que sobre el tema se han realizado en Colombia, sus aspectos metodológicos y las conclusiones a las que dichos estudios han llegado.

Caracterización de la competencia entre dos organizaciones del sector de seguros en Colombia

En la permanente búsqueda de mejores condiciones que las organizaciones realizan con el propósito de dar respuesta a los cambios del entorno y la complejidad de la interacción con las organizaciones del mismo sector, se encuentra necesario identificar las características que les permiten a estas, sobrevivir, mantenerse en el mercado o crecer en él. En este orden de ideas, en este documento se desarrolla la caracterización de la forma como dos organizaciones importantes y líderes del sector asegurador en Colombia: Seguros Bolívar y Suramericana de Seguros, compiten, desde el punto de vista comercial, con el propósito de identificar como esto influye en cada organización. La investigación se centró en explicar a partir de los autores revisados y analizados con respecto al concepto de la competencia, en particular, la forma como se enfrenta la organización al entorno tanto interno como externo, la influencia de cada organización según su estructura, su importancia, la disponibilidad de los recursos necesarios para desarrollar sus actividades, el impacto y las implicaciones organizacionales a partir de la forma cómo se enfrenta el entorno. Para lo anterior y con base a la revisión conceptual, se realizó la recolección de datos y cifras tanto de las organizaciones como del sector al cual pertenecen, adicionalmente se realizaron entrevistas tanto estructuradas como semi estructuradas al área de ventas, debido a que es el área de las organizaciones encargada de generar estrategias de ventas, posicionar productos en el mercado, identificar el perfil del consumidor, conocer y comprender el mercado y la competencia. Lo anterior con el fin de caracterizar a las organizaciones analizadas, determinando cómo responden a la competencia y al entorno, para finalmente establecer cuáles son los comportamientos recurrentes, similares y diferentes entre ellas. Por lo tanto, los resultados obtenidos en la investigación permiten establecer si dos empresas con estructuras, tamaño y participación en el mercado similares compiten de igual forma y que implicación tiene esto en el comportamiento organizacional.

Nova Talenta: 2014-2015

Contenido Introducción 1. Inteligencia emocional, liderazgo transformacional y género: factores que influencian el desempeño organizacional / Ana María Galindo Londoño, Sara Urrego Mayorga; Director: Juan Carlos Espinosa Méndez. 2. El rol de la mujer en el liderazgo / Andrea Patricia Cuestas Díaz; Directora: Francoise Venezia Contreras Torres. 3. Liderazgo transformacional, clima organizacional, satisfacción laboral y desempeño. Una revisión de la literatura / Juliana Restrepo Orozco, Ángela Marcela Ochoa Rodríguez; Directora: Françoise Venezia Contreras Torres. 4. “E-Leadership” una perspectiva al mundo de las compañías globalizadas / Ángela Beatriz Morales Morales, Mónica Natalia Aguilera Velandia; Director: Juan Carlos Espinosa. 5. Liderazgo y cultura. Una revisión / Daniel Alejandro Romero Galindo; Directora: Francoise Venezia Contreras Torres. 6. La investigación sobre la naturaleza del trabajo directivo: una revisión de la literatura / Julián Felipe Rodríguez Rivera, María Isabel Álvarez Rodríguez; Director: Juan Javier Saavedra Mayorga. 7. La mujer en la alta dirección en el contexto colombiano / Ana María Moreno, Juliana Moreno Jaramillo ; Directora: Françoise Venezia Contreras Torres. 8. Influencia de la personalidad en el discurso y liderazgo de George W. Bush después del 11 de septiembre de 2011 / Karen Eliana Mesa Torres; Director: Juan Carlos Espinosa. 9. La investigación sobre el campo del followership: una revisión de la literatura / Christian D. Báez Millán, Leidy J. Pinzón Porras; Director: Juan Javier Saavedra Mayorga. 10. El liderazgo desde la perspectiva del poder y la influencia. Una revisión de la literatura / Lina María García, Juan Sebastián Naranjo; Director: Juan Javier Saavedra Mayorga. 11. El trabajo directivo para líderes y gerentes: una visión integradora de los roles organizacionales / Lina Marcela Escobar Campos, Daniel Mora Barrero; Director: Rafael Piñeros. 12. Participación emocional en la toma de decisiones / Lina Rocío Poveda C., Gloria Johanna Rueda L.; Directora: Francoise Contreras T. 13. Estrés y su relación con el liderazgo / María Camila García Sierra, Diana Paola Rocha Cárdenas; Director: Juan Carlos Espinosa. 14. “Burnout y engagement” / María Paola Jaramillo Barrios, Natalia Rojas Mancipe; Director: Rafael Piñeros.

Las adicciones a la luz del psicoanálisis, una revisión de literatura

El presente trabajo de grado es una revisión de la literatura que permite hacer un recorrido desde el psicoanálisis acerca de la compleja problemática de las adicciones. Para ello, se revisaron las bases de datos PepWeb, Ebsco, y Jstor, revisando las posiciones del psicoanálisis freudiano, lacaniano y otras corrientes psicoanalíticas respondiendo a las siguientes preguntas de investigación: (a) ¿Cómo se comprenden las adicciones desde un marco de referencia psicoanalítico? (b) ¿Cómo –desde la teoría freudiana y la teoría lacaniana - se aborda la comprensión de la adicción? (c) ¿Qué dice el psicoanálisis contemporáneo sobre ésta problemática? Se abordan temas como la concepción de una adicción desde la perspectiva de Freud y Lacan hasta psicoanalistas contemporáneos, el rol que juega el goce en la adicción y, finalmente, el complejo debate incipiente sobre la legalidad del tóxico. Se encontró que es un campo de constante publicación y es necesario que los clínicos y los psicoanalistas aborden este campo de estudio clínico permanentemente y sigan produciendo investigaciones sobre el fenómeno.

La política comercial de Estados Unidos en el marco de la Organización Mundial del Comercio. Discurso vs. comportamiento con relación a prácticas anticompetitivas

El objetivo principal de esta monografía es identificar cuáles son las razones que justifican las contradicciones entre el discurso y el comportamiento de Estados Unidos en el marco de la Organización Mundial del Comercio, particularmente con relación a prácticas anticompetitivas derivadas del programa de protección a la agricultura del país. Para ello se analizan el interés nacional y los elementos de la seguridad nacional a partir de los cuales éste se ha construido. También se evalúan los procesos de formulación de política comercial y las interacciones entre los representantes políticos, las asociaciones de productores y el sector privado para mostrar como este comportamiento contradictorio corresponde a la legitimización de un interés particular.

Application of a relational frame theory account of psychological flexibility in young children

Resumen tomado de la publicaci??n

Families of periodic horseshoe orbits in the restricted three-body problem

We compute families of symmetric periodic horseshoe orbits in the restricted three-body problem. Both the planar and three-dimensional cases are considered and several families are found.We describe how these families are organized as well as the behavior along and among the families of parameters such as the Jacobi constant or the eccentricity. We also determine the stability properties of individual orbits along the families. Interestingly, we find stable horseshoe-shaped orbit up to the quite high inclination of 17◦

Attention and selection behavior on ‘universal search’ result pages

The ISO norm line 9241 states some criteria for ergonomics of human system interaction. In markets with a huge variety of offers and little possibility of differentiation, providers can gain a decisive competitive advantage by user oriented interfaces. A precondition for this is that relevant information can be obtained for entrepreneurial decisions in this regard. To test how users of universal search result pages use those pages and pay attention to different elements, an eye tracking experiment with a mixed design has been developed. Twenty subjects were confronted with search engine result pages (SERPs) and were instructed to make a decision while conditions “national vs. international city” and “with vs. without miniaturized Google map” were used. Different parameters like fixation count, duration and time to first fixation were computed from the eye tracking raw data and supplemented by click rate data as well as data from questionnaires. Results of this pilot study revealed some remarkable facts like a vampire effect on miniaturized Google maps. Furthermore, Google maps did not shorten the process of decision making, Google ads were not fixated, visual attention on SERPs was influenced by position of the elements on the SERP and by the users’ familiarity with the search target. These results support the theory of Amount of Invested Mental Effort (AIME) and give providers empirical evidence to take users’ expectations into account. Furthermore, the results indicated that the task oriented goal mode of participants was a moderator for the attention spent on ads. Most important, SERPs with images attracted the viewers’ attention much longer than those without images. This unique selling proposition may lead to a distortion of competition on markets.

The utility of social behavior rating scales for children who are deaf and hard of hearing

This independent study provides an overview of the social-emotional and theory of mind development of children birth through high school and evaluates the utility of social-emotional rating scales in the classroom for children who are deaf and hard of hearing.

The unsteady flow of a weakly compressible fluid in a thin porous layer. I: Two-dimensional theory

We consider the problem of determining the pressure and velocity fields for a weakly compressible fluid flowing in a two-dimensional reservoir in an inhomogeneous, anisotropic porous medium, with vertical side walls and variable upper and lower boundaries, in the presence of vertical wells injecting or extracting fluid. Numerical solution of this problem may be expensive, particularly in the case that the depth scale of the layer h is small compared to the horizontal length scale l. This is a situation which occurs frequently in the application to oil reservoir recovery. Under the assumption that epsilon=h/l<<1, we show that the pressure field varies only in the horizontal direction away from the wells (the outer region). We construct two-term asymptotic expansions in epsilon in both the inner (near the wells) and outer regions and use the asymptotic matching principle to derive analytical expressions for all significant process quantities. This approach, via the method of matched asymptotic expansions, takes advantage of the small aspect ratio of the reservoir, epsilon, at precisely the stage where full numerical computations become stiff, and also reveals the detailed structure of the dynamics of the flow, both in the neighborhood of wells and away from wells.

Rate-limiting steps in the development of atherosclerosis: the response-to-influx theory

A large number of processes are involved in the pathogenesis of atherosclerosis but it is unclear which of them play a rate-limiting role. One way of resolving this problem is to investigate the highly non-uniform distribution of disease within the arterial system; critical steps in lesion development should be revealed by identifying arterial properties that differ between susceptible and protected sites. Although the localisation of atherosclerotic lesions has been investigated intensively over much of the 20th century, this review argues that the factor determining the distribution of human disease has only recently been identified. Recognition that the distribution changes with age has, for the first time, allowed it to be explained by variation in transport properties of the arterial wall; hitherto, this view could only be applied to experimental atherosclerosis in animals. The newly discovered transport variations which appear to play a critical role in the development of adult disease have underlying mechanisms that differ from those elucidated for the transport variations relevant to experimental atherosclerosis: they depend on endogenous NO synthesis and on blood flow. Manipulation of transport properties might have therapeutic potential. Copyright (C) 2004 S. Karger AG, Basel.

Extraction behavior of the synergistic system 2,6-bis-(benzoxazolyl)-4-dodecyloxylpyridine and 2-bromodecanoic acid using Am and Eu as radioactive tracers

In this study, the extraction properties of a synergistic system consisting of 2,6-bis-(benzoxazolyl)-4-dodecyloxylpyridine (BODO) and 2-bromodecanoic acid (HA) in tert-butyl benzene (TBB) have been investigated as a function of ionic strength by varying the nitrate ion and perchlorate ion concentrations. The influence of the hydrogen ion concentration has also been investigated. Distribution ratios between 0.03-12 and 0.003-0.8 have been found for Am(III) and Eu(HI), respectively, but there were no attempts to maximize these values. It has been shown that the distribution ratios decrease with increasing amounts of ClO4-, NO3-, and H+. The mechanisms, however, by which the decrease occurs, are different. In the case of increasing perchlorate ion concentration, the decrease in extraction is linear in a log-log plot of the distribution ratio vs. the ionic strength, while in the nitrate case the complexation between nitrate and Am or Eu increases at high nitrate ion concentrations and thereby decreases the distribution ratio in a non-linearway. The decrease in extraction could be caused by changes in activity coefficients that can be explained with specific ion interaction theory (SIT); shielding of the metal ions, and by nitrate complexation with Am and Eu as competing mechanism at high ionic strengths. The separation factor between Am and Eu reaches a maximum at similar to1 M nitrate ion concentration. Thereafter the values decrease with increasing nitrate ion concentrations.