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During the last few years critical advancements in Wireless Sensor Networks (WSNs) have highlighted respective platforms as a prominent technology able to tackle various challenges posed by Smart-City application scenarios. Through their communication paradigm and platform versatility WSNs are able to meet increasingly demanding communication requirements. However, a critical area that has not been...
The problem of managing and orchestrating communication protocols is studied using the discrete event system approach. The indicative cases of the BGP, the CAN protocol and the IEEE 802.11 protocol are modelled as finite state machines Two supervisors are designed to be simultaneously applied. The first controls the consecutive connection tries of each protocol. The second orchestrates the hierarchical...
The paper pertains to the cyber-security challenges in Industry 4.0 that cyber-security experts have to deal with nowadays. Due to the nature of Industry 4.0, where all devices in manufacturing technologies are interconnected, exchanging data and information with each other, broadens the cyber-lands horizons for cyber-criminals to exploit them in their interest. The paper makes reference to the industrial...
The evolving technology and the demand for high throughput links has led to the design of Data Centers with optical switching. Among the latest wave of design proposals is the Nephele Data Center architecture consisting of optical data planes, optical Points of Delivery (PoD) switches and Top of Rack (ToR) switches communicating with 10 Gbps links to the PoDs and the servers. Based on a Software Defined...
The evolving technology and the demand for high throughput links has led to the design of Data Centers with optical switching. Among the latest wave of design proposals is the Nephele Data Center architecture consisting of optical data planes, optical Points of Delivery (PoD) switches and Top of Rack (ToR) switches communicating with 10 Gbps links to the PoDs and the servers. Based on a Software Defined...
4th Generation (4G) Mobile Networks based on the All-IP paradigm are aggressively deployed worldwide and 5th Generation (5G) mobile networks will emerge in the forthcoming years. Signaling load optimization on the air-interface is vital for mobile telecommunications. One of the major issues considered by research is the tracking update versus paging trade-off. This means that there is a trade-off...
Increased complexity of computer hardware makes close to impossible to rely on hand-coding at the-level of HDLs for digital hardware design. High-level synthesis can be employed instead, in order to automatically obtain HDL codes from highlevel language functional descriptions. With high-level synthesis it becomes easier to design coprocessors, accelerators, and other special-purpose hardware. Nonetheless,...
This paper describes the dynamic seminar management system named “e-Sem”, developed according to the open-source software philosophy. Due to its dynamic management functionality, it can equally adapt to any education environment (Primary, Secondary, Tertiary). The purpose of the proposed dynamic system is ease of use and handling, by any class of users, without the need of special guidance. Also,...
Reduced-complexity implementations are critical for massive MIMO (Multiple Input, Multiple Output) systems. In this paper we consider the uplink of broadband massive MIMO systems employing SC-FDE (Single-Carrier with Frequency-Domain Equalization) schemes, where multiple users transmit to a single base station with a large number of antennas. We propose low-complexity frequency-domain detection schemes...
Video streaming through Internet faces different challenges caused by network performance and heterogeneity nature of internet. The larger the distance between end-user and streaming server the stream passes through different networks and causes delays which affect the user quality of experience (QoE). An optimal approach to minimize delays and offer high video quality is Cache implementation. Operators...
This article aims to present a strategy to properly distribute the graduates to complete a fourth year of after-Lyceum apprenticeship in the specialized field of Vocational Education and Training (VET) as it is implemented in Greece. The theoretical solution of the issue is presented, as well as the terms and conditions that should be met in order to create an on-line platform capable of organizing...
QR code is a very popular type of 2D barcode. In practice, QR code is an image which consists of black and white patterns. QR code is capable of carrying alphanumerical message embedded using Reed-Solomon error correction algorithm. The coded content carries messages aimed for various purposes. When scanned with today omnipresent smart devices, with camera and software, the message is processed and...
This paper outlines the effects of educational and casual software applications on young children, and defines a framework for monitoring, assessing, and improving their knowledge and skills. It shows how the use of such applications improves children skills in the main learning domains and increases their familiarity with the world. After analyzing specific abilities developed by different categories...
The major design challenges of ASIC design, like power dissipation, timing, voltage-drop, interconnect and reliability are tackled during the Physical Design phase of any flow. The placement procedure can significantly modify parts of the design and consequently metrics relevant to the aforementioned challenges. Text reports cannot always generate useful insight based solely on these metrics. Design...
Recommendation systems employed on the Internet aim to serve users by recommending items which will likely be of interest to them. The recommendation problem could be cast as either a rating estimation problem which aims to predict as accurately as possible for a user the rating values of items which are yet unrated by that user, or as a ranking problem which aims to find the top-k ranked items that...
The purpose of this paper is a presentation of a recursive project (a platform), that started three years ago, in which shore management companies can collect, transmit, store, analyze and finally use and present vessels live data on a Geographical Information System used as Global Monitoring Platform. We used those data for further analysis, and we produced information about engine performance, gas...
During the last few years critical advancements in Wireless Sensor Networks (WSNs) have highlighted respective platforms as a prominent technology able to tackle various challenges posed by Smart-City application scenarios. However, a critical area that has not been adequately taken into consideration concerns security provision necessity in conjunction to its impact on real WSN platform communication...
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