9,433 research outputs found
LHC Higgs Boson searches
A summary of the Higgs boson searches by the ATLAS and CMS collabrations
using 1 f b-1 of LHC data is presented, concentrating on the Standard Model
Higgs boson. Both experiments have the sensitivity to exclude at 95% CL a
Standard Model Higgs boson in most of the Higgs boson mass region between about
130 GeV and 400 GeV. The observed data allow the exclusion of a Higgs Boson of
mass 155 GeV to 190 GeV and 295 GeV to 450 GeV (ATLAS) and 149 GeV to 206 GeV
and 300 GeV to 440 GeV (CMS). The lower limits are not as constraining as might
be expected due to an excess in both experiments of order 2-3{\sigma} which
could be related to a low mass Higgs boson or to a statistical fluctuation.Comment: EPS Conference Proceeding
An endorsement-based approach to student modeling for planner-controlled intelligent tutoring systems
An approach is described to student modeling for intelligent tutoring systems based on an explicit representation of the tutor's beliefs about the student and the arguments for and against those beliefs (called endorsements). A lexicographic comparison of arguments, sorted according to evidence reliability, provides a principled means of determining those beliefs that are considered true, false, or uncertain. Each of these beliefs is ultimately justified by underlying assessment data. The endorsement-based approach to student modeling is particularly appropriate for tutors controlled by instructional planners. These tutors place greater demands on a student model than opportunistic tutors. Numerical calculi approaches are less well-suited because it is difficult to correctly assign numbers for evidence reliability and rule plausibility. It may also be difficult to interpret final results and provide suitable combining functions. When numeric measures of uncertainty are used, arbitrary numeric thresholds are often required for planning decisions. Such an approach is inappropriate when robust context-sensitive planning decisions must be made. A TMS-based implementation of the endorsement-based approach to student modeling is presented, this approach is compared to alternatives, and a project history is provided describing the evolution of this approach
The Malware Analysis Body of Knowledge (MABOK)
The ability to forensically analyse malicious software (malware) is becoming an increasingly important discipline in the field of Digital Forensics. This is because malware is becoming stealthier, targeted, profit driven, managed by criminal organizations, harder to detect and much harder to analyse. Malware analysis requires a considerable skill set to delve deep into malware internals when it is designed specifically to detect and hinder such attempts. This paper presents a foundation for a Malware Analysis Body of Knowledge (MABOK) that is required to successfully forensically analyse malware. This body of knowledge has been the result of several years of research into malware dissection
Using Artificial Intelligence for Model Selection
We apply the optimization algorithm Adaptive Simulated Annealing (ASA) to the
problem of analyzing data on a large population and selecting the best model to
predict that an individual with various traits will have a particular disease.
We compare ASA with traditional forward and backward regression on computer
simulated data. We find that the traditional methods of modeling are better for
smaller data sets whereas a numerically stable ASA seems to perform better on
larger and more complicated data sets.Comment: 10 pages, no figures, in Proceedings, Hawaii International Conference
on Statistics and Related Fields, June 5-8, 200
Distributed Receding Horizon Control with Application to Multi-Vehicle Formation Stabilization
We consider the control of interacting subsystems whose dynamics and constraints are uncoupled, but whose state vectors are coupled non-separably in a single centralized cost function of a finite horizon optimal control problem. For a given centralized cost structure, we generate distributed optimal control problems for each subsystem and establish that the distributed receding horizon implementation is asymptotically stabilizing. The communication requirements between subsystems with coupling in the cost function are that each subsystem obtain the previous optimal control trajectory of those subsystems at each receding horizon update. The key requirements for stability are that each distributed optimal control not deviate too far from the previous optimal control, and that the receding horizon updates happen sufficiently fast. The theory is applied in simulation for stabilization of a formation of vehicles
A pilot of the use of the WAIS III in learning disability services
The present study is a pilot examining how a group of people (n=133) with a learning disability perform on the Wechsler Adult Intelligence Scale – Third Edition (1997). The study found that Full Scale IQ was not always predictive of performance on individual subtests or of performance on the Indices. Implications for clinical practice are discussed
Reducing multi-dimensional information into a 1-d histogram
We present two methods for reducing multidimensional information to one
dimension for ease of understand or analysis while maintaining statistical
power. While not new, dimensional reduction is not greatly used in high-energy
physics and has applications whenever there is a distinctive feature (for
instance, a mass peak) in one variable but when signal purity depends on
others; so in practice in most of the areas of physics analysis. While both
methods presented here assume knowledge of the background, they differ in the
fact that only one of the methods uses a model for the signal, trading some
increase in statistical power for this model dependence
Turning people into couch potatoes is not the cure for sports concussion
No abstract available
SM Higgs properties measurement at ATLAS
The discovery of a new particle in the Higgs searches being prepared for LHC will not guarantee that the Standard Model Higgs boson has been seen. This paper discusses the possibilities for measuring the spin, parity and couplings of the particle, under the assumption that it does in fact behave like the Standard Model Higgs. The key question, which cannot alas be answered, is: if it looks like a dog, and barks like a dog, how much of the DNA must we analyse to be sure that it is a dog
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