1,868 research outputs found
Making sense of business leadership vis-à -vis china’s reform and transition
Purpose – The purpose of this paper is to explore the contemporary paradigm of business leadership vis-à-vis China’s reform and transitional context. Design/methodology/approach – The paper employs an evidence-based approach to explore the business leadership issues influenced by economic reform and within the context of societal transition in China. A qualitative research method was adopted based on in-depth interviews with a number of middle managers from a variety of Chinese enterprises, including state-owned, domestic-private and foreigninvested enterprises. Content analysis of several rounds of interviews added depth to the data analysis. Findings – The findings complement existing thoughts and illustrate concepts, issues, and characteristics not yet emphasized in mainstream literature. General patterns and associated characteristics of business leadership in China, as well as specific patterns associated with different forms of enterprise ownerships, are identified. Research limitations/implications – The study makes a timely and necessary contribution that enriches context-specific understandings of business leadership against the backdrop of surrounding economic, social, and cultural changes. Practical implications – The study enriches understandings of commonalities and differences in leadership across the globe, facilitating working collaboratively to achieve common goals in a global community. Originality/value – The study offers new insights into business leadership by linking contextual, personal, and cognitional factors together and demonstrates some unique characteristics of leadership styles in transitional economies like China
Distributed Contingency Analysis over Wide Area Network among Dispatch Centers
Traditionally, a regional dispatch center uses the equivalent method to deal
with external grids, which fails to reflect the interactions among regions.
This paper proposes a distributed N-1 contingency analysis (DCA) solution,
where dispatch centers join a coordinated computation using their private data
and computing resources. A distributed screening method is presented to
determine the Critical Contingency Set (DCCS) in DCA. Then, the distributed
power flow is formulated as a set of boundary equations, which is solved by a
Jacobi-Free Newton-GMRES (JFNG) method. During solving the distributed power
flow, only boundary conditions are exchanged. Acceleration techniques are also
introduced, including reusing preconditioners and optimal resource scheduling
during parallel processing of multiple contingencies. The proposed method is
implemented on a real EMS platform, where tests using the Southwest Regional
Grid of China are carried out to validate its feasibility.Comment: 5 pages, 6 figures, 2017 IEEE PES General Meetin
Bell-INGARCH Model
Integer-valued time series exist widely in economics, finance, biology,
computer science, medicine, insurance, and many other fields. In recent years,
many types of models have been proposed to model integer-valued time series
data, in which the integer autoregressive model and integer-valued GARCH model
are the most representative. Although there have been many results of
integer-valued time series data, the parameters of integer-valued time series
model structure are more complicated. This paper is dedicated to proposing a
new simple integer-valued GARCH model. First, the Bell integer-valued GARCH
model is given based on Bell distribution. Then, the conditional maximum
likelihood estimation method is used to obtain the estimators of parameters.
Later, numerical simulations confirm the finite sample properties of the
estimation of unknown parameters. Finally, the model is applied in the two real
examples. Compared with the existing models, the proposed model is more simple
and applicable.Comment: 16 pages,4 figure
2,2-Dichloro-1-(2-phenyl-1,3-oxazolidin-3-yl)ethanone
In the title molÂecule, C11H11Cl2NO2, the oxazolidine ring is in an envelope conformation with the O atom forming the flap; the other four essentially planar ring atoms (r.m.s. deviation = 0.012 Å) form a dihedral angle of 91.1 (3)° with the phenyl ring. In the crystal structure, molÂecules are linked by weak interÂmolecular C—H⋯O hydrogen bonds, forming one-dimensional chains
GRB 221009A with an unconventional precursor: a typical two-stage collapsar scenario?
As the brightest Gamma-Ray burst (GRB) ever detected, GRB 221009A may offer a
chance that reveals some interesting features which are hidden in those bursts
that are not so bright. There seems a very weak emission with a flux of
erg cm s between the first pulse (~s, is the trigger time) and the main burst (appears from
s). Thus the gap time between them is not really quiescent, and the
first pulse could be taken as an unconventional precursor, which may provide a
peculiar case study for the GRB-precursor phenomena. A two-stage collapsar
scenario is proposed as the most likely origin for this burst. In this model,
the jet for the precursor is produced during the initial core-collapse phase,
and should be weak enough not to disrupt the star when it breaks out of the
envelope, so that the fallback accretion process and the forming of the disk
could continue. We present an approach in which the duration and flux both
provide constraints on the luminosity () and the Lorentz factor at
the breakout time () of this weak jet. The estimated erg s and has an order of ten,
which are well consistent with the theoretical prediction. Besides, the weak
emission in the gap time could be interpreted as a MHD outflow due to a
magnetically driven wind during the period from the proto-neutron star phase to
forming the accretion disk in this scenario.Comment: 12 pages, 5 figures, submmited the revised version on June 17t
- …