Muhammad Umer Wasim

H-infinity control via scenario optimization for handling and stabilizing vehicle using AFS control

Due to the day by day emergence of automobile industry, improvement in sensor technologies and the need to reduce the occurrence of accident vehicle handling and stability improvement technologies emanating. In this paper a novel H infinity controller via scenario optimization (H-infinity VSO) is presented for Active front steer (AFS) control the aim is to handle and stabilize vehicle under the uncertainty of parameter road adhesion coefficient µ. Parameter uncertainty is translated into perturbed matrixes. Optimal controller gains are calculated by considering predefined scenarios extracted according to the parameters ε and β. ε represents the probability of violation of LMI constraints and β represents confidence or risk failure. In this manner a chance constrained problem is solved which results in less conservativeness in stability and optimality. The results of proposed approach are much improved as compared to the optimal guaranteed cost controller (OGCC) and optimal coordination (OC) controller.

PRESENCE: Monitoring and Modelling the Performance Metrics of Mobile Cloud SaaS Web Services

Service Level Agreements (SLAs) are defining the quality of the services delivered from the Cloud Services Providers (CSPs) to the cloud customers. The services are delivered on a pay-per-use model. The quality of the provided services is not guaranteed by the SLA because it is just a contract. The developments around mobile cloud computing and the advent of edge computing technologies are contributing to the diffusion of the cloud services and the multiplication of offers. Although the cloud services market is growing for the coming years, unfortunately, there is no standard mechanism which exists to verify and assure that delivered services satisfy the signed SLA agreement in an automatic way. The accurate monitoring and modelling of the provided Quality of Service (QoS) is also missing. In this context, we aim at offering an automatic framework named PRESE NCE, to evaluate the QoS and SLA compliance of Web Services (WSs) offered across several CSPs. Yet unlike other approaches, PRESE NCE aims at quantifying in a fair and by stealth way the performance and scalability of the delivered WS. This article focuses on the first experimental results obtained on the accurate modelisation of each individual performance metrics. Indeed, 19 generated models are provided, out of which 78.9% accurately represent the WS performance metrics for two representative SaaS web services used for the validation of the PRESE NCE approach. This opens novel perspectives for assessing the SLA compliance of Cloud providers using the PRESE NCE framework.

Law as a service (LaaS): Enabling legal protection over a blockchain network

Breaches in online contracts (Service Level Agreements, SLAs) are usually compensated by gift vouchers at present, however as the online contracts emerge towards smart contracts, the breaches could potentially lead to court injunctions over blockchains. This research proposes Probability based Factor Model (PFM) that can be implemented over the blockchain to automatically identify breaches that can cause substantial damage and have high probability for recurrence. PFM can also issue court injunctions for the breaches. The underlying concept in PFM is built upon the notion of factor analysis and stochastic modeling from the discipline of Data Science. High performance computing (HPC) cluster at University of Luxembourg (HPC @ Uni.lu) and docker (a software container platform) were used to emulate contractual environment of three service providers: Redis, MongoDB, and Memcached Servers. The results showed that court injunction(s) was issued only for Redis and MongoDB Servers. Technically, this difference could be attributed to the fact that Memcached is simply used for caching and therefore, it is less prone to breach of contract. Whereas, Redis and MongoDB as databases and message brokers are performing more complex operations and are more likely to cause a breach. This research will benefit enterprises that view breach of contract as a limiting factor for implementation of smart contract in cyber-physical system or internet of things.

Extended survivable Passive Access Network (e-SPAN)

Wavelength Division Multiplexed based Passive Optical Networks (WDM-PON) are subjected to wide variety of incidental failures. It is preferred in WDM-PONs to provide fault management (survivability) at link layer level. In this paper, our objective is to determine the factors, which can increase the scope of survivability at link layer, not available currently. We propose a cost-effective recovery mechanism, called ldquoExtended Survivable Passive Access Networkrdquo (e-SPAN). e-SPAN is a multi-level protection scheme that has potential to corrects eventual errors that are caused by the transmission system by using different forward error correcting codes at receiver end, thus allowing us to have better performance budget in terms of BER and extended transmission distance of 8 to 12 Km.