296 research outputs found
Confucian principles in ICT Chinese practice: an exploratory model
The paper discusses culture, business culture and the influence of cultural values on managerial practice in general, and Information and Communications Technology (ICT) practice in particular. We argue that western ICT systems are based on optimization, underpinned by the positivism paradigm embedded in the western goal-seeking problem solving model. Eastern, in particular Chinese, ways of thinking, are based on a type of subjectivism that underlines a more intuitive, systemic way of viewing the world. The use of western-design ICT in an emergent business Chinese culture embedded in Confucian values reveals some misalignments. A model to explore these misalignments between ICT practice and Confucian Chinese business culture is advanced. Drawing from organizational theory models of national and business culture as premises, we propose a model containing a set of constructs to empirically investigate and confirm the processes involved in these misalignments
Adaptive Local Iterative Filtering for Signal Decomposition and Instantaneous Frequency analysis
Time-frequency analysis for non-linear and non-stationary signals is
extraordinarily challenging. To capture features in these signals, it is
necessary for the analysis methods to be local, adaptive and stable. In recent
years, decomposition based analysis methods, such as the empirical mode
decomposition (EMD) technique pioneered by Huang et al., were developed by
different research groups. These methods decompose a signal into a finite
number of components on which the time-frequency analysis can be applied more
effectively.
In this paper we consider the iterative filters (IFs) approach as an
alternative to EMD. We provide sufficient conditions on the filters that ensure
the convergence of IFs applied to any signal. Then we propose a new
technique, the Adaptive Local Iterative Filtering (ALIF) method, which uses the
IFs strategy together with an adaptive and data driven filter length selection
to achieve the decomposition. Furthermore we design smooth filters with compact
support from solutions of Fokker-Planck equations (FP filters) that can be used
within both IFs and ALIF methods. These filters fulfill the derived sufficient
conditions for the convergence of the IFs algorithm. Numerical examples are
given to demonstrate the performance and stability of IFs and ALIF techniques
with FP filters. In addition, in order to have a complete and truly local
analysis toolbox for non-linear and non-stationary signals, we propose a new
definition for the instantaneous frequency which depends exclusively on local
properties of a signal
Evolution mechanism of principal modes in climate dynamics
Eigen analysis has been a powerful tool to distinguish multiple processes into different simple principal modes in complex systems. For a non-equilibrium system, the principal modes corresponding to the non-equilibrium processes are usually evolving with time. Here, we apply the eigen analysis into the complex climate systems. In particular, based on the daily surface air temperature in the tropics (30? S–30? N, 0? E–360? E) between 1979-01-01 and 2016-12-31, we uncover that the strength of two dominated intra-annual principal modes represented by the eigenvalues significantly changes with the El Niño/southern oscillation from year to year. Specifically, according to the ‘regional correlation’ introduced for the first intra-annual principal mode, we find that a sharp positive peak of the correlation between the El Niño region and the northern (southern) hemisphere usually signals the beginning (end) of the El Niño. We discuss the underlying physical mechanism and suppose that the evolution of the first intra-annual principal mode is related to the meridional circulations; the evolution of the second intra-annual principal mode responds positively to the Walker circulation. Our framework presented here not only facilitates the understanding of climate systems but also can potentially be used to study the dynamical evolution of other natural or engineering complex systems. © 2020 The Author(s)
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