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Subcontractor selection plays a key role for the main contractor of a complex construction project. In this paper, we identify the higher partial semi-variance (HSV) of processing times to express the risk of tardiness, and propose a Mean-HSV model to provide a formal description for the subcontractor selection problem. The objective is to select the optimal combination of subcontractors to minimize...
This paper takes CSI 300 index futures as the research object, bases on actual market data, it calculates the optimal hedge ratio with VAR model, VECM model and GARCH model, analyses the hedging effectiveness, gets some corresponding results, and puts forward some recommendations for investors.
A strain of the high-accumulating bacterium P5 was isolated from the pond sludge. The bioreactor of immobilized cell was made up with cinder grain as the carrier. The experimental results show that under the optimal operating conditions, the phosphorus removal rate was 99.30% and the removal rate of CODCr was 92.14% to simulated wastewater with 20mg/L phosphorus (PO43−-P) for 30 minutes and the phosphorus...
In this paper, by means of the concept of Type II codes to arbitrary finite rings, we study the relation of codes over finite chain rings and γ-adic codes over a formal power series ring.
In this paper, we study self-dual codes over the ring of formal power series ring. We give construction methods of self-dual codes over this class of rings.
Because only one set of parameter estimates can be obtained using ordinary least squares regression, it is impossible to analyze the effect of different body mass index (BMI) values on uric acid in depth. Therefore, we can only analyze the effect of body mass index on average level of uric acid. In this study, we attempt to build a regression model using quantile regression theory and use the model...
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