Heterogeneous multiprocessor platforms are the foundation of systems that require high computational power combined with low energy consumption, like the IoT and mobile robotics. In this paper, we ...present five new algorithms for the design space exploration of platforms with elements grouped in clusters with very few connections in between, while these platforms have favorable electric properties and lower production costs, the limited interconnectivity and inability of heterogeneous platform elements to execute all types of tasks, significantly decrease the chance of finding a feasible mapping of application to the platform. We base the new algorithms on the Non-dominated Sorting Genetic Algorithm II (NSGA-II) meta-heuristic and the previously published SDSE mapping algorithm designed for fully interconnected multiprocessor platforms. With the aim to improve the chance of finding feasible solutions for sparsely connected platforms, we have modified the parts of the search process concerning the penalization of infeasible solutions, chromosome decoding, and mapping strategy. Due to the lack of adequate existing benchmarks, we propose our own synthetic benchmark with multiple application and platform models, which we believe can be easily extended and reused by other researchers for further studying this type of platform. The experiments show that four proposed algorithms can find feasible solutions in 100% of test cases for platforms with dedicated clusters. In the case of tile-like platforms, the same four algorithms show an average success rate of 60%, with one algorithm going up to 84%.
Botnets are considered as the primary threats on the Internet and there have been many research efforts to detect and mitigate them. Today, Botnet uses a DNS technique fast-flux to hide malware sites ...behind a constantly changing network of compromised hosts. This technique is similar to trustworthy Round Robin DNS technique and Content Delivery Network (CDN). In order to distinguish the normal network traffic from Botnets different techniques are developed with more or less success. The aim of this paper is to improve Botnet detection using an Intrusion Detection System (IDS) or router. A novel classification method for online Botnet detection based on DNS traffic features that distinguish Botnet from CDN based traffic is presented. Botnet features are classified according to the possibility of usage and implementation in an embedded system. Traffic response is analysed as a strong candidate for online detection. Its disadvantage lies in specific areas where CDN acts as a Botnet. A new feature based on search engine hits is proposed to improve the false positive detection. The experimental evaluations show that proposed classification could significantly improve Botnet detection. A procedure is suggested to implement such a system as a part of IDS.
Early application timing estimation is essential in decision making during design space exploration of heterogeneous embedded systems in terms of hardware platform dimensioning and component ...selection. The decisions which have the impact on project duration and cost must be made before a platform prototype is available and software code is ready to be linked and thus timing estimation must be done using high-level models and simulators. Because of the ever increasing need to shorten the time to market, reducing the amount of time required to obtain the results is as important as achieving high estimation accuracy. In this paper, we propose a novel approach to source-level timing estimation with the aim to close the speed-accuracy gap by raising the level of abstraction and improving result reusability. We introduce a concept – elementary operations as distinct parts of source code which enable capturing platform behaviour without having the exact model of the processor pipeline, cache etc. We also present a timing estimation method which relies on elementary operations to craft hardware profiling benchmark and to build application and platform profiles. Experiments show an average estimation error of 5%, with maximum below 16%.
Distributed Denial of Service (DDoS) attacks are a serious threat to Internet security. A lot of research effort focuses on having detection and prevention methods on the victim server side or source ...side. The Bloom filter is a space-efficient data structure used to support pattern matching problems. The filter is utilised in network applications for deep packet inspection of headers and contents and also looks for predefined strings to detect irregularities. In intrusion detection systems, the accuracy of pattern matching algorithms is crucial for dependable detection of matching pairs, and its complexity usually poses a critical performance bottleneck. In this paper, we will propose a novel Dual Counting Bloom Filter (DCBF) data structure to decrease false detection of matching packets applicable for the
SACK
2
algorithm. A theoretical evaluation will determine the false rate probability of detection and requirements for increased memory. The proposed approach significantly reduces the false rate compared to previously published results. The results indicate that the increased complexity of the DCBF does not affect efficient implementation of hardware for embedded systems that are resource constrained. The experimental evaluation was performed using extensive simulations based on real Internet traces of a wide area network link, and it was subsequently proved that DCBF significantly reduces the false rate.
This paper presents a review of current denial of service (DoS) attack and defence concepts, from a theoretical ad practical point of view. Seriousness of DoS attacks is tangible and they present one ...of the most significant threats to assurance of dependable and secure information systems, which is growing in importance. Rapid development of new and increasingly sophisticated attacks requires resourcefulness in designing and implementing reliable defences. We focus on providing a both fresh and relevant state of art reference with included different perspectives, such as economic DoS (EDoS) or offensive countermeasures in the cyber space. Considering the elaborated DoS mechanisms and state of art review, our considerations of main challenges are discussed. Directions are proposed for future research, considered required in defending against the DoS threat, which is evolving into a potentially major disruptive factor for global security models on all levels.
This paper explores modern open-source cloud platforms giving insight into the theoretical concepts they are based on, along with the analysis of challenges they face when deployed in business ...environment. In the first part of the paper, theoretical concepts like cloud computing, virtualization and software as a service paradigm, which form the basis for this new concept - the SaaS cloud platform, are discussed. Afterwards, the analysis of performance and deployment issues of the two most prominent open-source platforms Ulteo and LTSP Cluster is presented. We also discuss proposed solution to the issue of user application profile persistence between sessions. PUBLICATION ABSTRACT
Bio jednom Praxis Sruk, Vlado
Filozofska istraživanja,
12/2004, Letnik:
24, Številka:
3-4
Paper
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This text evokes the author’s memories on the times when he grew up intellectually under the influence of Praxis. Praxis and Korčula Summer School were life projects of its founders Gajo Petrović and ...Milan Kangrga.
This small group of historical importance for ex-Yugoslav and Croatian history of philosophy, has made and imprint on world philosophical scene as well.
So called »Praxis-philosophy« remains probably one of the most important original contributions to Marxist philosophy ever.
Book Reviews Vuković, Drago; Sruk, Vlado
Journal of computing and information technology,
06/1997, Letnik:
5, Številka:
2
Book Review
Recenzirano
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Karen Watterson is a consultant on database design and the author of several books on database programming, including bestselling Visual Basic Database Programming (Addison-Wesley). She is also the ...editor of the Visual basic Developer newsletter and Contributing Editor to Windows Sources magazine.
Book Reviews Sruk, Vlado; Vuković, Dragutin; Glavinić, Vlado ...
Journal of computing and information technology,
03/1996, Letnik:
4, Številka:
1
Book Review
Recenzirano
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PC System Architecture Series is a crisply written and comprehensive set of guides to the most important PC hardware standards. The series addresses a readership that has had exposure to PCs in a ...technical capacity but otherwise assumes a moderate technical knowledge only. According to the preface of the series, the material published is intended for those professionally involved in hardware and software design as well as for PC support personnel.
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