Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On Redundant Observability: From Security Index to Attack Detection and
  Resilient State Estimation   The security of control systems under sensor attacks is investigated.
Redundant observability is introduced, explaining existing security notions
including the security index, attack detectability, and observability under
attacks. Equivalent conditions between redundant observability and existing
notions are presented. Based on a bank of partial observers utilizing Kalman
decomposition and a decoder exploiting redundancy, an estimator design
algorithm is proposed enhancing the resilience of control systems. This scheme
substantially improves computational efficiency utilizing far less memory.

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The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
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The categories of this paper are: hep-th
2
The categories of this paper are: math
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
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The categories of this paper are: stat
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The categories of this paper are: q-bio
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The categories of this paper are: math-ph
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The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th