Protein quality control (QC) pathways survey the cellular proteome to selectively recognize and degrade faulty proteins whose accumulation can lead to various diseases. Recognition of the occasional aberrant protein among an abundant sea of similar normal counterparts poses a considerable challenge to the cell. Solving this problem requires protein QC machinery to assay multiple molecular crite...

An increasing number of real-time applications, related to multimedia and adaptive control systems, require greater flexibility than classical real-time theory usually permits. In this paper we present a novel periodic task model, in which tasks’ periods are treated as springs, with given elastic coefficients. Under this framework, periodic tasks can intentionally change their execution rate to...

Please cite this article in press as: Y. A. S ekercio (2009), doi:10.1016/j.comnet.2009.05.001 We present a comprehensive survey of proposed Quality of Service (QoS) mechanisms in the Media Access Control (MAC) sublayer of WiMAX based wireless networks. QoS support in WiMAX is a fundamental design requirement, and is considerably more difficult than in wired networks, mainly because of the vari...

We study the variations of the quadratic performance associated to a linear differential system of retarded type for small values of the delays. From an interpretation of delays as singular perturbations of abstract evolution operators, we revisit the usual theory of representation and optimal control of retarded systems. This leads to a new parameterization of associated Riccati operators for ...

ABSTRACT The single-phased power receivers, supplied to the industrial frequency, represent very inductive loads. These are connected to the three-phased network through the Steinmetz connection symmetrizing devices. Considering an experimental model which is reproducing in a small scale the real device, we have realized the designing of the control system, connected to the output interface of ...

As is clear to any user of software, quality control of software has not reached the same levels of sophistication as it has with traditional manufacturing. In this paper we argue that this is because insufficient thought is being given to the methods of reasoning under uncertainty that are appropriate to this domain. We then describe how we have built a largescale Bayesian network to overcome ...

In open and heterogeneous environments, where an unpredictable number of applications compete for a limited amount of resources, executions can be affected by also unpredictable delays, which may not even be bounded. Since many of these applications have timeliness requirements, they can only be implemented if they are able to adapt to the existing conditions. Adaptation can be done by several ...

The growing penetration of WLANs in the market, as well as the wider spectrum of applications that these kinds of networks are called to support, demands the introduction of new methods for efficient medium access. Today, the two dominating paradigms in medium access control are those of dynamic assignment and contention based ones. EY-NPMA is a contention based scheme that exhibits very low co...

In the upcoming new standard IEEE 802.11e to support Quality of Service (QoS) in WLAN, we present perfectly periodic scheduling based on usage probability ui to provide fault avoidance. We address Medium Access Control (MAC) enhancements found in the current 802.11e specification by emphasizing perfectly periodic scheduling over the proposed round robin polling.