4,948 research outputs found
A Different Dimensions' Success and a Different Management Control View
A different dimensions’ success is relevant to a different management control view (Shenharet al. 2001). It indicates that each different management level has different success dimensions, and each level needs to have different success measures. Therefore, organizations should manage different management level differently according to the management environment. This study deals with different management levels using two different concepts; program and project. The purpose of this research is to identify the nature of program management, and also, to ultimately present a perspective to build the framework of Program & Project MCS (Management Control System). For research purposes, here in this paper, I empirically examine the relation between single-project (New Product Development project) management and program management with the aspect of organization’s management ability. The data from 104 manufacturing industries in Japan were analyzed. The results show that program management efficiency is a significant element for single-project performance. Moreover, the findings indicate that there are different dynamic factors that enhance each program performance and project performance
An analytic solution for the noise generated by gust-aerofoil interaction for plates with serrated leading edges
This paper presents an analytic solution for the sound generated by an
unsteady gust interacting with a semi-infinite flat plate with a serrated
leading edge in a background steady uniform flow. Viscous and non-linear
effects are neglected. The Wiener-Hopf method is used in conjunction with a
non-orthogonal coordinate transformation and separation of variables to permit
analytical progress. The solution is obtained in terms of a modal expansion in
the spanwise coordinate, however for low- and mid-range incident frequencies
only the zeroth order mode is seen to contribute to the far-field acoustics,
therefore the far-field noise can be quickly evaluated. The solution gives
insight into the potential mechanisms behind the reduction of noise for plates
with serrated leading edges compared to those with straight edges, and predicts
a logarithmic dependence between the tip-to-root serration height and the
decrease of far-field noise. The two mechanisms behind the noise reduction are
proposed to be an increased destructive interference in the far field, and a
redistribution of acoustic energy from low cuton modes to higher cutoff modes
as the tip-to-root serration height is increased. The analytic results show
good agreement in comparison with experimental measurements. The results are
then compared against numerical predictions for the sound generated by a
spanwise invariant line vortex interacting with a flat plate with serrated
leading edge. Good agreement is also seen between the analytical and numerical
results as frequency and tip-to-root ratio are varied
Thermal conductivity of suspended pristine graphene measured by Raman spectroscopy
The thermal conductivity of suspended single-layer graphene was measured as a
function of temperature using Raman scattering spectroscopy on clean samples
prepared directly on a prepatterned substrate by mechanical exfoliation without
chemical treatments. The temperature at the laser spot was monitored by the
frequency of the Raman 2 band of the Raman scattering spectrum, and the
thermal conductivity was deduced by analyzing heat diffusion equations assuming
that the substrate is a heat sink at ambient temperature. The obtained thermal
conductivity values range from 1800 WmK near 325 K to
710 WmK at 500 K.Comment: 4pages, 3 figure
Mal-Netminer: Malware Classification Approach based on Social Network Analysis of System Call Graph
As the security landscape evolves over time, where thousands of species of
malicious codes are seen every day, antivirus vendors strive to detect and
classify malware families for efficient and effective responses against malware
campaigns. To enrich this effort, and by capitalizing on ideas from the social
network analysis domain, we build a tool that can help classify malware
families using features driven from the graph structure of their system calls.
To achieve that, we first construct a system call graph that consists of system
calls found in the execution of the individual malware families. To explore
distinguishing features of various malware species, we study social network
properties as applied to the call graph, including the degree distribution,
degree centrality, average distance, clustering coefficient, network density,
and component ratio. We utilize features driven from those properties to build
a classifier for malware families. Our experimental results show that
influence-based graph metrics such as the degree centrality are effective for
classifying malware, whereas the general structural metrics of malware are less
effective for classifying malware. Our experiments demonstrate that the
proposed system performs well in detecting and classifying malware families
within each malware class with accuracy greater than 96%.Comment: Mathematical Problems in Engineering, Vol 201
A new strategy for integrating abundant oxygen functional groups into carbon felt electrode for vanadium redox flow batteries
The effects of surface treatment combining corona discharge and hydrogen peroxide (H2O2) on the electrochemical performance of carbon felt electrodes for vanadium redox flow batteries (VRFBs) have been thoroughly investigated. Ahigh concentration of oxygen functional groups has been successfully introduced onto the surface of the carbon felt electrodes by a specially designed surface treatment, which is mainly responsible for improving the energy efficiency of VRFBs. In addition, the wettability of the carbon felt electrodes also can be significantly improved. The energy efficiency of the VRFB cell employing the surface modified carbon felt electrodes is improved by 7% at high current density (148 mA cm(-2)). Such improvement is attributed to the faster charge transfer and better wettability allowed by surface-active oxygen functional groups. Moreover, this method is much more competitive than other surface treatments in terms of processing time, production costs, and electrochemical performance.
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