On pole assignment in multi-input controllable linear systems

Pole assignment in multi-input controllable linear system

Realization theory of rational transfer matrices

Realization theory of rational transfer matrices presented as fundamental algebraic objects in theory of finite, constant linear system

Optical stationary control of a linear system with state-dependent noise

Optical stationary control of linear control system with state dependent Gaussian nois

A lyapunov method for the estimation of statistical averages

Liapunov method for estimation of statistical averages - application to control theory and theory of random vibratio

Supervisor Localization of Discrete-Event Systems based on State Tree Structures

Recently we developed supervisor localization, a top-down approach to distributed control of discrete-event systems in the Ramadge-Wonham supervisory control framework. Its essence is the decomposition of monolithic (global) control action into local control strategies for the individual agents. In this paper, we establish a counterpart supervisor localization theory in the framework of State Tree Structures, known to be efficient for control design of very large systems. In the new framework, we introduce the new concepts of local state tracker, local control function, and state-based local-global control equivalence. As before, we prove that the collective localized control behavior is identical to the monolithic optimal (i.e. maximally permissive) and nonblocking controlled behavior. In addition, we propose a new and more efficient localization algorithm which exploits BDD computation. Finally we demonstrate our localization approach on a model for a complex semiconductor manufacturing system

The compliance budget: Managing security behaviour in organisations

A significant number of security breaches result from employees’ failure to comply with security policies. Many organizations have tried to change or influence security behaviour, but found it a major challenge. Drawing on previous research on usable security and economics of security, we propose a new approach to managing employee security behaviour. We conducted interviews with 17 employees from two major commercial organizations, asking why they do or don’t comply with security policies. Our results show that key factors in the compliance decision are the actual and anticipated cost and benefits of compliance to the individual employee, and perceived cost and benefits to the organization. We present a new paradigm – the Compliance Budget - as a means of understanding how individuals perceive the costs and benefits of compliance with organisational security goals, and identify a range of approaches that security managers can use to influence employee’s perceptions (which, in turn, influence security behaviour). The Compliance Budget should be understood and managed in the same way as any financial budget, as compliance directly affects, and can place a cap on, effectiveness of organisational security measures