243 research outputs found
Novel aspects of insulin resistance and type 2 diabetes mellitus: iron metabolism, the complement system, and liver cirrhosis
Relapse primary central nervous system lymphoma successfully consolidated with allogeneic stem cell transplantation with thiotepa/busulfan/fludarabine conditioning
Primary central nervous system lymphoma (PCNSL) is generally characterized by a poor prognosis and frequent relapsing disease. Consolidation therapy in the upfront setting usually consists of an autologous stem cell transplantation. We report the case of a 19-year-old Caucasian male who had previously undergone an allogeneic stem cell transplantation with complete engraftment for the treatment of juvenile myelomonocytic leukemia when he was 1 year old. He presented with two episodes of (donor-derived) PCNSL from allogeneic stem cells; however, after induction chemotherapy, he failed to harvest stem cells for the consolidation with autologous stem cell transplantation. He was consolidated successfully with a second allogeneic stem cell transplantation with another donor after conditioning with thiotepa, busulfan, and fludarabine
A Firewall Optimization for Threat-Resilient Micro-Segmentation in Power System Networks
Electric power delivery relies on a communications backbone that must be
secure. SCADA systems are essential to critical grid functions and include
industrial control systems (ICS) protocols such as the Distributed Network
Protocol-3 (DNP3). These protocols are vulnerable to cyber threats that power
systems, as cyber-physical critical infrastructure, must be protected against.
For this reason, the NERC Critical Infrastructure Protection standard CIP-005-5
specifies that an electronic system perimeter is needed, accomplished with
firewalls. This paper presents how these electronic system perimeters can be
optimally found and generated using a proposed meta-heuristic approach for
optimal security zone formation for large-scale power systems. Then, to
implement the optimal firewall rules in a large scale power system model, this
work presents a prototype software tool that takes the optimization results and
auto-configures the firewall nodes for different utilities in a cyber-physical
testbed. Using this tool, firewall policies are configured for all the
utilities and their substations within a synthetic 2000-bus model, assuming two
different network topologies. Results generate the optimal electronic security
perimeters to protect a power system's data flows and compare the number of
firewalls, monetary cost, and risk alerts from path analysis.Comment: 12 pages, 22 figure
Multi-Source Data Fusion for Cyberattack Detection in Power Systems
Cyberattacks can cause a severe impact on power systems unless detected
early. However, accurate and timely detection in critical infrastructure
systems presents challenges, e.g., due to zero-day vulnerability exploitations
and the cyber-physical nature of the system coupled with the need for high
reliability and resilience of the physical system. Conventional rule-based and
anomaly-based intrusion detection system (IDS) tools are insufficient for
detecting zero-day cyber intrusions in the industrial control system (ICS)
networks. Hence, in this work, we show that fusing information from multiple
data sources can help identify cyber-induced incidents and reduce false
positives. Specifically, we present how to recognize and address the barriers
that can prevent the accurate use of multiple data sources for fusion-based
detection. We perform multi-source data fusion for training IDS in a
cyber-physical power system testbed where we collect cyber and physical side
data from multiple sensors emulating real-world data sources that would be
found in a utility and synthesizes these into features for algorithms to detect
intrusions. Results are presented using the proposed data fusion application to
infer False Data and Command injection-based Man-in- The-Middle (MiTM) attacks.
Post collection, the data fusion application uses time-synchronized merge and
extracts features followed by pre-processing such as imputation and encoding
before training supervised, semi-supervised, and unsupervised learning models
to evaluate the performance of the IDS. A major finding is the improvement of
detection accuracy by fusion of features from cyber, security, and physical
domains. Additionally, we observed the co-training technique performs at par
with supervised learning methods when fed with our features
Isotopic and velocity distributions of Bi produced in charge-pickup reactions of 208Pb at 1 A GeV
Isotopically resolved cross sections and velocity distributions have been
measured in charge-pickup reactions of 1 A GeV 208Pb with proton, deuterium and
titanium target. The total and partial charge-pickup cross sections in the
reactions 208Pb + 1H and 208Pb + 2H are measured to be the same in the limits
of the error bars. A weak increase in the total charge-pickup cross section is
seen in the reaction of 208Pb with the titanium target. The measured velocity
distributions show different contributions - quasi-elastic scattering and
Delta-resonance excitation - to the charge-pickup production. Data on total and
partial charge-pickup cross sections from these three reactions are compared
with other existing data and also with model calculations based on the coupling
of different intra-nuclear cascade codes and an evaporation code.Comment: 20 pages, 12 figures, background information on
http://www-w2k.gsi.de/kschmidt
Fragmentation of Nuclei at Intermediate and High Energies in Modified Cascade Model
The process of nuclear multifragmentation has been implemented, together with
evaporation and fission channels of the disintegration of excited remnants in
nucleus-nucleus collisions using percolation theory and the intranuclear
cascade model. Colliding nuclei are treated as face--centered--cubic lattices
with nucleons occupying the nodes of the lattice. The site--bond percolation
model is used. The code can be applied for calculation of the fragmentation of
nuclei in spallation and multifragmentation reactions.Comment: 19 pages, 10 figure
Predicting total reaction cross sections for nucleon-nucleus scattering
Nucleon total reaction and neutron total cross sections to 300 MeV for 12C
and 208Pb, and for 65 MeV spanning the mass range, are predicted using
coordinate space optical potentials formed by full folding of effective
nucleon-nucleon interactions with realistic nuclear ground state densities.
Good to excellent agreement is found with existing data.Comment: 10 pages, 4 figure
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