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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)
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)
OBJECTIVE To develop nature agent absorbing ultraviolet from plants for preventing UV damage. METHODS Conduct ultraviolet visible spectrum scanning to aqueous extraction and alcohol extraction from polygonatum odoratum and onion. And compare the spectrum of Heilongjiang and Hunan polygonatum odoratum extraction. Dilute 5 times of the aqueous and alcohol(More)
OBJECTIVE To establish a TLC-FTIR method for detection of western medicine phenolphthalein added illegally into anti-obesity and healthcare food. METHODS The sample was extracted with anhydrous alcohol. The stationary phase was the GF254 aluminium alloy silica gel plates (10 cm x 20 cm) while the developing solvent was acetic ether: petroleum ether(More)
Highly crystalline and idiomorphic CoTiO3 single crystals with a well-defined polyhedral morphology were grown successfully for the first time by a facile flux method. Herein, the effects of the molten salt type and cobalt precursor on the phase composition, crystallization habit and morphology of the CoTiO3 products were also investigated. Importantly,(More)
This study was designed to investigate the relationship between plasma lipid profile and acne. Acne patients (n = 181) and healthy volunteers (n = 130) matched in terms of both age and sex were enrolled. Plasma total cholesterol (TC), triglyceride (TG), high-density lipoprotein cholesterol, low-density lipoprotein cholesterol (LDL-C) and lipoprotein (LP)(a)(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)