Complex Systems Research Center

Bogotá, Colombia

Complex Systems Research Center

Bogotá, Colombia
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Bucheli V.,University of Los Andes, Colombia | Bucheli V.,Complex Systems Research Center | Diaz A.,University of Los Andes, Colombia | Calderon J.P.,University of Los Andes, Colombia | And 9 more authors.
Scientometrics | Year: 2012

The aim of this paper is to study the knowledge production of Colombian universities in terms of their accumulation of intellectual capital (IC). We observe Colombian universities' publications between 1958 and 2008, categorizing each university according to growth trends in its scientific publications: early exponential growth, late exponential growth, and linear and irregular growth. This work describes the relationships between these growth trends and IC accumulation. It presents an historical description of some institutional changes in Colombian universities that improved the research activity. In addition, we present an empirical study of IC accumulation in universities from the three growth trend categories between 2003 and 2009. We suggest that the adapting capacity, the accumulation time, and the strategies of IC accumulation related to feedback structures are key factors in explaining the differences in knowledge production between growth categories of Colombian universities. The results show critical differences-on orders of magnitude-in IC accumulation across the three categories. Therefore, it would be possible to define a roadmap to improve the knowledge production in Colombian universities. © 2012 Akadémiai Kiadó, Budapest, Hungary.

Bucheli V.,University of Los Andes, Colombia | Bucheli V.,Complex Systems Research Center | Calderon J.P.,University of Los Andes, Colombia | Calderon J.P.,Complex Systems Research Center | And 6 more authors.
Proceedings of ISSI 2013 - 14th International Society of Scientometrics and Informetrics Conference | Year: 2013

Bibliographic databases such as Thomson Reuters' Web of Science (WoS) or Elsevier's Scopus support search filtering by country or institution. However, the study of the scientific production at internal levels of organizations (universities) such as departments or faculties is error prone. In this paper, it shows common errors to retrieve papers in WoS at departmental-level or at faculty-level. We propose a method to support the information retrieval process at internal level of universities. The method is composed by an exhaustive search strategy and a Bayesian model to estimate the attribution of universities' papers that belong to a given department or faculty. The method was validated on two real cases with promising results. This work is a research in progress; the contrast with other methods and other cases of evaluation are proposed as future work. Nevertheless, it could open new opportunities to scientometric studies and research policy. © AIT Austrian Institute of Technology GmbH Vienna 2013.

Grubic T.,Liverpool Hope University | Grubic T.,Complex Systems Research Center | Peppard J.,European School of Management and Technology
Journal of Manufacturing Technology Management | Year: 2016

Purpose - Remote monitoring technology (RMT) is widely acknowledged as an important enabler of servitisation however, there is a dearth of understanding about how RMT is used by manufacturing firms to support servitised strategies. The purpose of this paper is to contribute to this important yet somewhat ignored topic in servitisation research. It attempts to address the following questions: what has constrained, and what has enabled the exploitation of RMT in the context of servitised strategies? Design/methodology/approach - The research adopts an exploratory multiple-case study design. Four in-depth descriptive case studies of companies operating in aerospace, industrial equipment, marine, and transport sectors were conducted. The collected data were analysed and synthesised, drawing out conclusions. Findings - The study describes how four manufacturers are using RMT and identifies ten factors that have enabled and constrained the realisation of expected outcomes. The enabling factors identified include: skills, experience, and knowledge; support from customers and other complementary data sources, processes, and structures; operations centres; historical data; and presence of in-house knowledge and capabilities. While the constraining factors include: defining benefits of RMT; limitations of RMT; limited understanding about true capabilities of RMT; knowledge management; and lack of alignment between services and manufacturing strategies. Research limitations/implications - While considerable attention and effort have been invested in designing and conducting the research and analysing the data from the case studies, more empirical work is required to validate and enrich findings and conclusions. For this purpose several research questions to guide further theory development in this area are formulated. Originality/value - This paper is an in-depth study examining the role of RMT in supporting servitised strategies. In particular, it explores how this technology is used in practice to support service-oriented value propositions of manufacturers and identifies the factors that are key to successfully executing this strategy. As such it qualifies as one of the first studies of this kind. © Emerald Group Publishing Limited.

Sanchez-Palencia D.M.,University of Los Andes, Colombia | Sanchez-Palencia D.M.,Complex Systems Research Center | Navarro J.,University of Los Andes, Colombia | Araque J.C.,Institute Cardiologia | And 9 more authors.
ASAIO Journal | Year: 2015

Small intestinal submucosa grafts for vascular regeneration have produced variable patency (0-100%) that has been concurrent with variability in fabrication techniques. We hypothesized that 1) preservation (P) or removal (R) of the stratum compactum layer of the intestine and 2) a dehydrated (D) or hydrated (H) state of the graft, affect early patency and tissue regeneration. We combined both parameters through a 22 factorial experimental design into four groups (PD, RD, PH, RH), and compared them in an in vivo early response predictive model (swine, ID 4.5 mm, 7d, n = 4). Patency, thrombogenicity, vascularization, fibroblast infiltration, macrophage polarization profile, endothelialization, and biaxial mechanics were assessed. PD grafts remained patent (4/4) but had scarce vascularization and fibroblast infiltration. RD and RH had extensive vascularization and fibroblast infiltration, however, RD had sustained patency (4/4) and the highest number of regeneration-associated phenotype macrophages (M2), whereas RH had lower patency (3/4) and less M2 macrophages. PH had a modest cellular infiltration, but the lowest patency (2/4) and a dominant adverse macrophage phenotype. Elasticity of R grafts evolved toward that of native carotids (particularly RD), while P grafts kept their initial stiffness. We concluded that fabrication parameters drastically affected early patency and regeneration, with RD providing the best results. © 2015 by the American Society for Artificial Internal Organs.

Sanchez-Palencia D.M.,University of Los Andes, Colombia | Sanchez-Palencia D.M.,Complex Systems Research Center | D'Amore A.,University of Pittsburgh | D'Amore A.,McGowan Institute for Regenerative Medicine | And 7 more authors.
Journal of Biomechanics | Year: 2014

In small intestinal submucosa scaffolds for functional tissue engineering, the impact of scaffold fabrication parameters on success rate may be related to the mechanotransductory properties of the final microstructural organization of collagen fibers. We hypothesized that two fabrication parameters, 1) preservation (P) or removal (R) of a dense collagen layer present in SIS and 2) SIS in a final dehydrated (D) or hydrated (H) state, have an effect on scaffold void area, microstructural anisotropy (fiber alignment) and mechanical anisotropy (global mechanical compliance). We further integrated our experimental measurements in a constitutive model to explore final effects on the micromechanical environment inside the scaffold volume. Our results indicated that PH scaffolds might exhibit recurrent and large force fluctuations between layers (up to 195. pN), while fluctuations in RH scaffolds might be larger (up to 256. pN) but not as recurrent. In contrast, both PD and RD groups were estimated to produce scarcer and smaller fluctuations (not larger than 50. pN). We concluded that the hydration parameter strongly affects the micromechanics of SIS and that an adequate choice of fabrication parameters, assisted by the herein developed method, might leverage the use of SIS for functional tissue engineering applications, where forces at the cellular level are of concern in the guidance of new tissue formation. © 2014 Elsevier Ltd.

Galindo-Torres S.A.,Complex Systems Research Center | Galindo-Torres S.A.,University of Queensland | Lizcano A.,Complex Systems Research Center | Lizcano A.,University of Los Andes, Colombia | And 2 more authors.
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | Year: 2012

In the present paper through a shear test on a fully saturated granular medium, simulated by the discrete element method, the effect of the heat produced by friction on the internal pore water pressure is explored. It is found that the dissipated energy is enough to increase the pore pressure and reduce the soil strength. In adiabatic and impermeable conditions the heat builds up quickly inside the shear band, and the softening is more pronounced. It is found as well that for real geological materials, heat conduction is not enough to reduce the pore pressure, and the softening prevails. Nevertheless, it is observed that the hydraulic conduction may mitigate or completely eliminate the temperature growth inside the shear band. This result provides new understanding on the thermodynamic factors involved in the onset of catastrophic landslides. © 2012 American Physical Society.

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