2,354 research outputs found
Hypervisor Integrity Measurement Assistant
An attacker who has gained access to a computer may want to upload or modify configuration files, etc., and run arbitrary programs of his choice. We can severely restrict the power of the attacker by having a white-list of approved file checksums and preventing the kernel from loading loading any file with a bad checksum. The check may be placed in the kernel, but that requires a kernel that is prepared for it. The check may also be placed in a hypervisor which intercepts and prevents the kernel from loading a bad file.
We describe the implementation of and give performance results for two systems. In one the checksumming, or integrity measurement, and decision is performed by the hypervisor instead of the OS. In the other only the final integrity decision is done in the hypervisor. By moving the integrity check out from the VM kernel it becomes harder for the intruder to bypass the check.
We conclude that it is technically possible to put file integrity control into the hypervisor, both for kernels without and with pre-compiled support for integrity measurement
Heavy Tetraquarks in the Diquark-Antidiquark Picture
The homogeneous Lippmann-Schwinger integral equation is solved in momentum
space to calculate the masses of heavy tetraquarks with hidden charm and
bottom. The tetraquark bound states are studied in the diquark-antidiquark
picture as a two-body problem. A regularized form of the diquark-antidiquark
potential is used to overcome the singularity of the confining potential at
large distances or small momenta. Our numerical results indicate that the
relativistic effect leads to a small reduction in the mass of heavy
tetraquarks, which is less than for charm and less than for
bottom tetraquarks. The calculated masses of heavy tetraquarks for , ,
, and states are in good agreement with other theoretical
calculations and experimental data. Our numerical analysis predict the masses
of heavy tetraquarks for , and states for the first time, and we
are not aware of any other theoretical results or experimental data for these
states
A Hybrid Three Layer Architecture for Fire Agent Management in Rescue Simulation Environment
This paper presents a new architecture called FAIS for imple- menting
intelligent agents cooperating in a special Multi Agent environ- ment, namely
the RoboCup Rescue Simulation System. This is a layered architecture which is
customized for solving fire extinguishing problem. Structural decision making
algorithms are combined with heuristic ones in this model, so it's a hybrid
architecture
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