Quantitative analysis has always been a difficult problem in security analysis of intrusion tolerance systems. An intrusion tolerance model based on multiple recovery mechanisms is introduced in this paper and how to ...Quantitative analysis has always been a difficult problem in security analysis of intrusion tolerance systems. An intrusion tolerance model based on multiple recovery mechanisms is introduced in this paper and how to quantify the security attributes of the model is proposed. A state transition model with recovery states more accurately describes the dynamic behavior of the system. Considering that recovery mechanisms have a great impact on the security performance of the system, we set up the cost models corresponding to different recovery mechanisms. We propose a feasible security measure based on mean cost to security failure in order to evaluate the system cost during the recovery phase. The experimental results confirmed the feasibility of the proposed methods.展开更多
This investigation deals with the intelligent system for parallel fault-tolerant diagnostic tests construction. A modified parallel algorithm for fault-tolerant diagnostic tests construction is proposed. The algorithm...This investigation deals with the intelligent system for parallel fault-tolerant diagnostic tests construction. A modified parallel algorithm for fault-tolerant diagnostic tests construction is proposed. The algorithm is allowed to optimize processing time on tests construction. A matrix model of data and knowledge representation, as well as various kinds of regularities in data and knowledge are presented. Applied intelligent system for diagnostic of mental health of population which is developed with the use of intelligent system for parallel fault-tolerant DTs construction is suggested.展开更多
AIM To determine whether normal geneticallyirnmunocornpetent rodent hosts could bemanipulated to accept human hepatocytetransplants with long term survival withoutirnrnunosuppression.METHODS Tolerance towards humanhep...AIM To determine whether normal geneticallyirnmunocornpetent rodent hosts could bemanipulated to accept human hepatocytetransplants with long term survival withoutirnrnunosuppression.METHODS Tolerance towards humanhepatocytes was established by injection ofprimary human hepatocytes or Huh7 humanhepatoma cells into the peritoneal cavities offetal rats. Corresponding cells weresubsequently transplanted into newborn rats viaintrasplenic injection within 24 h after birth.RESULTS Mixed lymphocyte assays showedthat spleen cells from non-tolerized rats werestimulated to proliferate when exposed to humanhepatocytes, while cells from tolerized ratswere not. Injections made between 15 d and 17 dof gestation produced optimal tolerizaton.Transplanted human hepatocytes in rat liverswere visualized by immunohistochemicalstaining of human albumin. By dot blotting ofgenomic DNA in livers of tolerized rats 16 weeksafter hepatocyte transplantation, it was foundthat approximately 2.5 × 105 human hepatocytessurvived per rat liver. Human albumin mRNA wasdetected in rat livers by RT-PCR for 15 wk, andhuman albumin protein was also detectable in ratserum.CONCLUSION Tolerization of an immuno-competent rat can permit transplantation, andsurvival of functional human hepatocytes.展开更多
Intrusion tolerance system is a new technology of network security. It can provide acceptable or degraded system service when intrusions occur. In this article, the system's basic function, technique and objective...Intrusion tolerance system is a new technology of network security. It can provide acceptable or degraded system service when intrusions occur. In this article, the system's basic function, technique and objective are introduced. A kind of state transition model is discussed. The intrusion tolerance architecture based on state the transition model and several vulnerabilities cases are proposed.展开更多
基金Supported in part by the National Natural Science Foundation of China(61472139)the Key Project of Shanghai Science and Technology Commission(11511504403)
文摘Quantitative analysis has always been a difficult problem in security analysis of intrusion tolerance systems. An intrusion tolerance model based on multiple recovery mechanisms is introduced in this paper and how to quantify the security attributes of the model is proposed. A state transition model with recovery states more accurately describes the dynamic behavior of the system. Considering that recovery mechanisms have a great impact on the security performance of the system, we set up the cost models corresponding to different recovery mechanisms. We propose a feasible security measure based on mean cost to security failure in order to evaluate the system cost during the recovery phase. The experimental results confirmed the feasibility of the proposed methods.
文摘This investigation deals with the intelligent system for parallel fault-tolerant diagnostic tests construction. A modified parallel algorithm for fault-tolerant diagnostic tests construction is proposed. The algorithm is allowed to optimize processing time on tests construction. A matrix model of data and knowledge representation, as well as various kinds of regularities in data and knowledge are presented. Applied intelligent system for diagnostic of mental health of population which is developed with the use of intelligent system for parallel fault-tolerant DTs construction is suggested.
文摘AIM To determine whether normal geneticallyirnmunocornpetent rodent hosts could bemanipulated to accept human hepatocytetransplants with long term survival withoutirnrnunosuppression.METHODS Tolerance towards humanhepatocytes was established by injection ofprimary human hepatocytes or Huh7 humanhepatoma cells into the peritoneal cavities offetal rats. Corresponding cells weresubsequently transplanted into newborn rats viaintrasplenic injection within 24 h after birth.RESULTS Mixed lymphocyte assays showedthat spleen cells from non-tolerized rats werestimulated to proliferate when exposed to humanhepatocytes, while cells from tolerized ratswere not. Injections made between 15 d and 17 dof gestation produced optimal tolerizaton.Transplanted human hepatocytes in rat liverswere visualized by immunohistochemicalstaining of human albumin. By dot blotting ofgenomic DNA in livers of tolerized rats 16 weeksafter hepatocyte transplantation, it was foundthat approximately 2.5 × 105 human hepatocytessurvived per rat liver. Human albumin mRNA wasdetected in rat livers by RT-PCR for 15 wk, andhuman albumin protein was also detectable in ratserum.CONCLUSION Tolerization of an immuno-competent rat can permit transplantation, andsurvival of functional human hepatocytes.
文摘Intrusion tolerance system is a new technology of network security. It can provide acceptable or degraded system service when intrusions occur. In this article, the system's basic function, technique and objective are introduced. A kind of state transition model is discussed. The intrusion tolerance architecture based on state the transition model and several vulnerabilities cases are proposed.
