Search results for "COMPLEXITY"
showing 10 items of 1094 documents
Teams and project performance: an ability, motivation, and opportunity approach
2020
This article analyzes the relationships between project performance and the team’s ability, motivation, and opportunity (AMO). We contribute to the project management literature by exploring which combinations of AMO factors are best for project performance at different levels of complexity. We test our hypotheses on a sample of 285 projects. Our study shows that in simple projects, ability is the key factor both as a main effect and as a constraining factor that acts as a bottleneck for project performance. In the case of complex projects, the multiplicative model is superior given the significant interaction effects of motivation.
Comparison of genomic sequences clustering using Normalized Compression Distance and Evolutionary Distance
2008
Genomic sequences are usually compared using evolutionary distance, a procedure that implies the alignment of the sequences. Alignment of long sequences is a long procedure and the obtained dissimilarity results is not a metric. Recently the normalized compression distance was introduced as a method to calculate the distance between two generic digital objects, and it seems a suitable way to compare genomic strings. In this paper the clustering and the mapping, obtained using a SOM, with the traditional evolutionary distance and the compression distance are compared in order to understand if the two distances sets are similar. The first results indicate that the two distances catch differen…
Robust control in uncertain multi-inventory systems and consensus problems
2008
Abstract We consider a continuous time linear multi–inventory system with unknown demands bounded within ellipsoids and controls bounded within polytopes. We address the problem of ∈-stabilizing the inventory since this implies some reduction of the inventory costs. The main results are certain conditions under which ∈-stabilizability is possible through a saturated linear state feedback control. The idea of this approach is similar to the consensus problem solution for a network of continuous time dynamic agents, where each agent evolves according to a first order dynamics has bounded control and it is subject to unknown but bounded disturbances. In this context, we derive conditions under…
Introduction: The Late Chalcolithic of Northern Mesopotamia in Context. Building on a Long and Eventful Debate
2022
Many of the debates that have until recently driven research into Mesopotamia’s proto-urban phase (5th– 4th millennia BCE) have now been reassessed thanks to new fieldwork in Iraqi Kurdistan and new data into the relationships between the north and south of the Alluvium from hitherto poorly-documented regions. These debates were re-examined in the light of this new material during a workshop held at the ICAANE in 2018 in Munich, leading to unprecedented perspectives on the patterns of early urbanization, social mobility, and the organization of Late Chalcolithic communities. Drawing on research first presented at ICAANE, and building on the most recent data from surveys and excavations, thi…
Image boundaries detection: from thresholding to implicit curve evolution
2014
The development of high dimensional large-scale imaging devices increases the need of fast, robust and accurate image segmentation methods. Due to its intrinsic advantages such as the ability to extract complex boundaries, while handling topological changes automatically, the level set method (LSM) has been widely used in boundaries detection. Nevertheless, their computational complexity limits their use for real time systems. Furthermore, most of the LSMs share the limit of leading very often to a local minimum, while the effectiveness of many computer vision applications depends on the whole image boundaries. In this paper, using the image thresholding and the implicit curve evolution fra…
Steiner systems and configurations of points
2020
AbstractThe aim of this paper is to make a connection between design theory and algebraic geometry/commutative algebra. In particular, given any Steiner SystemS(t, n, v) we associate two ideals, in a suitable polynomial ring, defining a Steiner configuration of points and its Complement. We focus on the latter, studying its homological invariants, such as Hilbert Function and Betti numbers. We also study symbolic and regular powers associated to the ideal defining a Complement of a Steiner configuration of points, finding its Waldschmidt constant, regularity, bounds on its resurgence and asymptotic resurgence. We also compute the parameters of linear codes associated to any Steiner configur…
Robust control of a Hammerstein model of DC/DC converters
2007
This paper deals with the robust control of a Hammerstein mathematical model of DC/DC converters, consisting of the nonlinear static characteristics of the converter followed by one of a few number of linear time- invariant models which describe the converter in the useful working range. One of these models is assumed as the nominal model of the system and the remaining models are used for describing the model uncertainty. Nominal behaviour is assured using H-2 optimal control method, Robust stability and behaviour are assured by imposing H-infin specifications. The closed loop control system consisting of the converter Hammerstein model and the robust controller is analyzed by means of sim…
Una instantánea movida de la investigación en procesos de traducción
2014
Este artículo brinda un panorama de los avances en las investigaciones sobre los procesos de traducción e interpretación desde enfoques cognitivos y psicolingüísticos entre 2006 y 2013, con el fin de contextualizar las restantes contribuciones a este monográfico. Ofrece algunas cifras sobre publicaciones e iniciativas y luego se centra en la competencia y la pericia, la redacción, la carga mental y la complejidad lingüística, los avances en los métodos de investigación, la revisión y la metacognición, la cognición más allá del pensamiento racional y consciente, y la recontextualización de la investigación empírica. Para concluir se ofrecen algunas notas sobre las tendencias generales en el …
Complexity and interaction: comparing the development of L1 and L2
2011
In research into first and second language development, the focus has mainly been either on the formal features of learner language alone (both L1 and L2) or on the interaction between learners and their caretakers (L1) or native speaker peers (L2).These research traditions have been kept a part even though it has been widely acknowledged that both first and second languages are appropriated essentially in social interaction. This paper aims to strengthen the connection between social and formal approaches by combining interactional views with those focusing on the structural complexity of learner language. Some excerpts from L1 and L2 interaction data (in the Finnish language) are discusse…
A new approach to the identification of cognitive conflicts in the repertory grid: A nomothetic study
1994
Abstract Two separate but related investigations are reported. In the first, a score was derived from a construct correlation matrix obtained by grid data processing. This score, the Correlation Test (CT) score, expresses the percentage of unbalanced triads in the construct correlation matrix and is considered to assess logical inconsistency. It is discussed as being qualitatively different from other scores derived from construct correlation matrices, such as cognitive complexity scores. It is suggested that the CT score refers to cognitive integration, whereas other scores usually refer to cognitive differentiation. The second investigation was an attempt to trace the clinical implication…