Singular value diagnosis in dam safety monitoring effect values SCIENCE CHINA Technological Sciences 54, 1169 (2011); Using morphological analysis to tackle uncertainty at the design phase for a safety critical application Propulsion and Power Research 4, 1 (2015);. RESEARCH PAPER .

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This paper presents a method of constructing anticipatory monitors for P A LTL (parameterized LTL (linear temporal logic)) based on automata theory. This paper on one hand investigates into the important concepts about the syntax, anticipatory semantics, valuation generation and binding of P A LTL. It is assured that the binding and using are correct in syntax level. Then the concept of parameterized anticipatory monitor is presented consisting of the static part and the dynamic part. The static part is presented as parameterized Büchi automata, and the dynamic part is composed of the valuations of variables in the current state. While the system running, based on the static parameterized Büchi automata, the valuations of variables are dynamically generated and bound from the current state in an on-the-fly fashion, and the anticipatory monitor incrementally checks whether the current running system is satisfied with the given parameterized property. In this process, the parameterized monitor can precisely identify the minimal good/bad prefix of the monitored property.

Access control is a vital security mechanism in today's operating systems, and the security policies dictating the security relevant behaviors is lengthy and complex, for example in Security-Enhanced Linux (SELinux). It is extremely difficult to verify the consistency between the security policies and the security goals desired by applications. In this paper, we present how to predict whether the information flow security goal is violated or not during runtime, how to generate the corresponding control actions on-line when divergence is detected and how to apply these actions in time based on software active monitoring technique. The symbolic security information flow model of SElinux is generated from a formalization of the access control mechanism which can be used to generate the N-step ahead projection of the future behavior. Information flow security goals are expressed in linear temporal logic (LTL) which provides clear description of the objectives desired by applications. Anticipatory monitor is generated from LTL formula automatically. We consider an on-line scheme where after the occurrence of an event, the next control action is determined on the basis of the N-step ahead projection of the future behavior. This procedure is repeated after the occurrence of next security relevant event. Thus, a closed-loop system is generated that all behavior sequences will satisfy the security goals.