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With growing cost of electricity, the power management (PM) of server clusters has become an important problem. However, most previous researchers only address the challenge in homogeneous environments. Considering the increasing popularity of heterogeneous systems, this paper proposes an efficient algorithm for PM of heterogeneous soft real-time clusters.(More)
We examine how the evidence of the time-varying volatility in stock returns affects optimal dynamic portfolio choice of investors with long horizons. As return volatility shows a relatively small correlation with realized return, its time-variation is expected to cause little, if any, hedging demand (in the sense of Merton (1973)). However, we find that,(More)
With growing cost of electricity, the power management of server clusters has become an important problem. Most existing research, however, either do not apply to virtualized environments or do not focus on power-efficient workload distribution. To fill in this research gap, we propose a workload distribution algorithm for virtualized server clusters to(More)
Spiral bevel gear milling machine is one typical representative of complex manufacturing equipments, it is important for the mechanical manufacturing industry to improve the spiral bevel gear milling machine’s manufacturing capacity. One virtual simulation machining model of new type spiral bevel gear milling machine is set up with the simulation(More)
This paper examines the asymmetric response of equity volatility to return shocks. We generalize the news impact function (NIF), originally introduced by Engle and Ng (1993) to study asymmetric volatility under the ARCH-type models, to be applicable to both stochastic volatility (SV) and ARCH-type models. Based on the generalized concept, we provide a(More)
The existing empirical literature fails to agree on the nature of the intertemporal relation between expected return and volatility. The contrary results of either a positive or a negative risk-return relation mainly arise from different ways of empirically modeling the return dynamics in the absence of any theoretical guidance. This paper contributes to(More)
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