Heterogeneous Recovery Strategy Based on CORBA for Intrusion Tolerant Distributed Object System
Distributed object based intrusion tolerant system (ITDOS) has become one of the attractive issues on intrusion tolerance. There havebeen many significant researches on the model of a heterogeneous intrusion tolerant distributed object system, but few of them focus on distributedobject recovery strategy. This paper presents a model of ITDOS based on middleware, CORBA, which is based on the researches of the SITARmodel, and presents a recovery strategy for ITDOS in this model. The objects, recovered by the recovery strategy, can resist the attack of the last tosome extent. It is validated by experiment that the strategy correctly performs forward recovery.
Abstract This study contributes to the literature on socially responsible investing by examining the diversification potential of commodities, specifically oil, gold and clean energy together with the Brazilian Corporate Sustainability Index (ISE). Multivariate GARCH models are used to model volatility spillovers and conditional correlation in pairs of stocks containing ISE. Specifically, A-BEKK and A-DCC models with spillovers are estimated. The models’ results are used to compute and analyze the optimal weights and hedge ratios for stock portfolio holdings. The greatest benefit from diversification is obtained through the acquisition of gold and then OVX.