Optimization of a Fast-Pick Area in a Cosmetics Distribution Center

Fast-pick areas are commonly used in order picking warehouses to improve labor efficiency by concentrating picking activities within a compact area, thus minimizing the distance traveled by the pickers. One problem that must be solved when a fast-pick area is to be implemented is the so-called assignment-allocation problem. This deals with deciding which products should be assigned to the fast-pick area, and how much space should be allocated to these products. This research was motivated by the picking operation of a cosmetics distribution center where several fast-pick areas are in place. A mixed integer linear programming formulation is proposed for solving the variant of the assignment-allocation problem found in this company. Our computational experiments show that the proposed model is efficient for solving small yet realistic instances of the problem

Optimization of a Fast-Pick Area in Cosmetics Distribution Center

Poster 1

Las historias mínimas del anónimo transeúnte. Breve reseña de un episodio urbano

From middle of last century in Medellin -like many others cities around the world- and for more than 30 years, a photographers' small army they realized the most enormous quantity of images with a particular characteristic: at random. They captured the paDesde mediados del siglo pasado en Medellín, como muchas otras ciudades del mundo, y durante más de 30 años, un pequeño ejército de fotógrafos se dieron cuenta de la cantidad más enorme de imágenes con una característica particular: al azar. Capturaron a

Morphometric and Meristic Characterization of Native Chame Fish (Dormitator latifrons) in Ecuador Using Multivariate Analysis

Ecuador, a country exhibiting large developments in fish farming, has a great variety of freshwater native fish. Among these fish is the Dormitator latifrons or chame, which has characteristics that make its farming prone to occur at a quite-developed stage. However, morphological characterization is required to establish a conservation program. In this study, 300 chames were captured in the Manabi province (Ecuador) to analyze their morphostructural model and to evaluate the effects of sex and the production system through multivariant techniques. The fish from the farm presented morphological measurements that were statistically (p 0.05). The percentage of correct adscription was 84%, with larger errors in wild fish. The morphostructural model had a high homogeneity, with 89.95% significant correlations (p < 0.05), and wild male and female fish were more homogeneous. The farm fish were larger because of the higher food availability. Moreover, the species exhibited sexual dimorphism, although there were no great differences in the morphometric measurements. This study shows the great biodiversity that naturally exists in Ecuadorian rivers. Therefore, it is of great interest to develop a chame breeding and conservation program

Aquatic mammal fossils in Latin America – a review of records, advances and challenges in research in the last 30 years

Records of aquatic mammal fossils (e.g. cetaceans, pinnipeds, sirenians, mustelids, and desmostylians) from Latin America (Mexico to Tierra del Fuego, including Antartica) span since the mid-1800s. Aquatic mammal fossils received little attention from the scientific community, with most of the first studies conducted by Northern Hemisphere researchers. Over the last 30 years, paleontological research in Latin America has increased considerably, with descriptions of several new species and revisions of published original records. The Latin American fossil record of marine mammals spans from the Eocene to the Pleistocene, with formations and specimens of global significance. All three main groups of cetaceans are represented in the continent (Archaeoceti, Mysticeti, and Odontoceti). Pinnipedia are represented by the families Otariidae and Phocidae, with records starting in the Middle Miocene. Both living families of Sirenia (Trichechidae and Dugongidae) are recorded. While less common, but still relevant, records of desmostylians and mustelids are known from Oligocene and Miocene deposits. This review provides a summary of the aquatic mammals known to date, with a special focus on the advances and developments of the last 30 years, since Cozzuol’s (1996) review of the South American fossil record. An up-to-date complete list of species based on the literature and unpublished data is also provided. The study also provides future directions for paleontological research in Latin America, and discusses the challenges and opportunities in the field, including the emergence of a strong new generation of Latin American researchers, many of whom are women. Keywords: Cetacea, Pinnipedia, Sirenia, Southern Hemispher

Mapeo de cultivos de Cacao mediante software libre QField utilizando equipos Android para el proyecto SENA SGPS8548- CACAO

The objective of this work is to make known about the new technologies for capturing information in the field through a personalized design, guaranteeing uniformity and centralization of data to facilitate workflow, precision, data quality and help to improve research results. Geographical location and description of the object using an attribute form is a determining factor in field research. There are new technological tools that have the particularity of working without an Internet connection and can be installed on any Android computer. The selected study area corresponds to 5 subregions of the Department of Antioquia. On the other hand, cocoa is one of the main export products of the country, so its cultivation has increased in the last decade, however, there is no detailed census of these. The SENA learning service implemented through free software the capture of variables for cocoa crops in the project (SGPS8548- CACAO) using free software QGIS and the field information capture module QField. A total of 11 researchers captured field variables and the information was synchronized in the central database using the FolderSync application.El objetivo de este trabajo es dar a conocer las nuevas tecnologías de captura de información en campo mediante un diseño personalizado, garantizando la uniformidad y centralización de datos para que facilite el flujo de trabajo, precisión, calidad de los datos y que ayudan a mejorar los resultados de investigación. La ubicación geográfica y la descripción del objeto mediante un formulario de atributos es un factor determinante en la investigación de campo. Existen nuevas herramientas tecnológicas que tienen la particularidad de trabajar sin conexión a Internet y se puede instalar en cualquier equipo Android. El área de estudio seleccionada corresponde a 5 subregiones del Departamento de Antioquia (Occidente, Magdalena Medio-Nordeste, Urabá, Suroeste y bajo Cauca). Por otra parte, el cacao es uno de los principales productos de exportación del país, por lo que su cultivo se ha incrementado en la última década. Sin embargo, no se tiene un censo detallado de estos. El Servicio Nacional de Aprendizaje SENA implementa mediante software libre QGIS y el módulo de captura de información en campo QField, la captura de variables para cultivos de cacao en el proyecto (SGPS8548- CACAO). En total 11 investigadores realizan captura de variables de campo y se sincroniza la información en la base de datos central mediante la aplicación FolderSync

Nutrient Dependent Cross-Kingdom Interactions: Fungi and Bacteria From an Oligotrophic Desert Oasis

Microbial interactions play a key role in ecosystem functioning, with nutrient availability as an important determinant. Although phylogenetically distant bacteria and fungi commonly co-occur in nature, information on their cross-kingdom interactions under unstable, extreme environments remains poor. Hence, the aims of this work were to evaluate potential in vitro interactions among fungi and bacteria isolated from a phosphorous oligotrophic aquatic system in the Cuatro Ciénegas Basin, Mexico, and to test the nutrients-based shifts. We assessed growth changes in bacteria (Aeromonas and Vibrio) and fungi (Coprinellus micaceus, Cladosporium sp., and Aspergillus niger) on co-cultures in relation to monocultures under diverse nutrient scenarios on Petri dishes. Interactions were explored using a network analysis, and a metabolome profiling for specific taxa. We identified nutrient-dependent patterns, as beneficial interactions dominated in low-nutrients media and antagonistic interactions dominated in rich media. This suggests that cross-kingdom synergistic interactions might favor microbial colonization and growth under low nutrient conditions, representing an adaptive trait to oligotrophic environments. Moreover, our findings agree with the stress-gradient hypothesis, since microbial interactions shifted from competition to cooperation as environmental stress (expressed as low nutrients) increased. At a functional level consistent differences were detected in the production of secondary metabolites, agreeing with plate bioassays. Our results based on culture experiments, provides evidence to understand the complexity of microbial dynamics and survival in phosphorous-depleted environments