According to the theory of Network Calculus based on the (min,+) algebra, analysis and measure of worst-case performance in communication networks can be made easily. In this context, this paper deals with traffic regulation and performance guarantee of a network i.e. with flow control. At first, assuming that a minimum service provided by a network is known, we aim at finding the constraint ov...

Researchers use file-based Version Control System (VCS) as the primary source of code evolution data. VCSs are widely used by developers, thus, researchers get easy access to historical data of many projects. Although it is convenient, research based on VCS data is incomplete and imprecise. Moreover, answering questions that correlate code changes with other activities (e.g., test runs, refacto...

In this paper we present a deterministic worstcase framework for accurate reconstruction of discrete (source) data as an alternative to the traditional probabilistic approaches in the communications area. This framework can be explored based on robust control ideas and formulations. Some of the particular problems touched upon are: (i) necessary and sufficient conditions for causal (no delay) a...

We are interested in a new class of optimal control problems for discrete event systems. We adopt the formalism of supervisory control theory (Proc. IEEE 77(1) (1989) 81) and model the system as a 4nite state machine (FSM). Our control problem is characterized by the presence of uncontrollable as well as unobservable events, the notion of occurrence and control costs for events and a worst-case...

Automated openand closed-loop control systems can enhance the performance of irrigation delivery systems. This paper examines the response of the canal test cases developed by the ASCE task committee on canal automation algorithms to a particular anticipatory open-loop control technique, gate stroking. The performance of the ideal gate-stroking solution is compared with the performance of an ap...

This paper deals with a new type of optimal control for Discrete Event Systems. Our control problem extends the theory of 18], that is characterized by the presence of uncontrollable events, the notion of occurrence and control costs for events, and a worst-case objective function. A signiicant diierence with the work in 18] is that our aim is to make the system evolve through a set of multiple...

The design of optimal disturbance accommodation and servomechanism controllers with limited plant model information is considered in this paper. Their closed-loop performance are compared using a performance metric called competitive ratio which is the worst-case ratio of the cost of a given control design strategy to the cost of the optimal control design with full model information. It was re...

Discrete-time stochastic systems employing possibly discontinuous state-feedback control laws are addressed in this paper. Allowing discontinuous state-feedback control laws is in fact fundamental for stochastic systems regulated, for instance, by optimization-based control laws. We introduce generalized random solutions for discontinuous stochastic systems in order to guarantee existence of so...

Although both blackand white-box testing have the same objective, namely detecting faults in a program, they are often conducted separately. In our opinion, the reason is the lack of techniques and tools integrating both strategies, although integration can substantially decrease testing costs. Specifically, an integrated technique can generate a reduced test suite, as single test cases can cov...

The status of current model-driven engineering technologies has matured over the last years whereas the infrastructure supporting model management is still in its infancy. Infrastructural means include version control systems, which are successfully used for the management of textual artifacts like source code. Unfortunately, they are only limited suitable for models. Consequently, dedicated so...