An Overview of Channel Models for NGSO Satellites

Scientific Conference (2022, September)

An overview of classroom composition research on social-emotional outcomes

Scientific Conference (2017, August)

An overview of energy efficiency techniques in cluster computing systems

in Cluster Computing (2011), 16(1), 3-15

An Overview of Generic Tools for Information-Theoretic Secrecy Performance Analysis over Wiretap Fading Channels

E-print/Working paper (2020)

An alternative or supplementary approach named as physical layer security has been proposed to afford an extra security layer on top of the conventional cryptography technique. In this paper, an overview ... [more ▼]

An alternative or supplementary approach named as physical layer security has been proposed to afford an extra security layer on top of the conventional cryptography technique. In this paper, an overview of secrecy performance investigations over the classic Alice-Bob-Eve wiretap fading channels is conducted. On the basis of the classic wiretap channel model, we have comprehensively listed and thereafter compared the existing works on physical layer secrecy analysis considering the small-scale, large-scale, composite, and cascaded fading channel models. Exact secrecy metrics expressions, including secrecy outage probability (SOP), the probability of non-zero secrecy capacity (PNZ), average secrecy capacity (ASC), and secrecy bounds, including the lower bound of SOP and ergodic secrecy capacity, are presented. In order to encompass the aforementioned four kinds of fading channel models with a more \textit{generic} and \textit{flexible} distribution, the mixture gamma (MG), mixture of Gaussian (MoG), and Fox's $H$-function distributions are three useful candidates to largely include the above-mentioned four kinds of fading channel models. It is shown that they are flexible and general when assisting the secrecy analysis to obtain closed-form expressions. Their advantages and limitations are also highlighted. Conclusively, these three approaches are proven to provide a unified secrecy analysis framework and can cover all types of independent wiretap fading channel models. Apart from those, revisiting the existing secrecy enhancement techniques based on our system configuration, the on-off transmission scheme, jamming approach (including artificial noise (AN) & artificial fast fading (AFF)), antenna selection, and security region are presented. [less ▲]

An Overview of Intertemporal Measures of Individual Well-Being: Can They Explain Life Satisfaction Better?

in Tachibanaki, Toshiaki (Ed.) Advances in Happiness Research: A Comparative Perspective (2016)

Traditional economic modeling has neglected the basic fact that individual well-being depends on one’s own life course and on comparisons with others. These assumptions have been challenged by an ... [more ▼]

Traditional economic modeling has neglected the basic fact that individual well-being depends on one’s own life course and on comparisons with others. These assumptions have been challenged by an increasing number of contributions in the income-distribution literature on the measurement of individual well-being. These have proposed various indices which allow different aspects of past experiences to be brought into the analysis of the phenomenon under consideration. This chapter is a review of these measures with the aim of offering some guidance to the recent developments of the parallel literature on happiness. [less ▲]

An Overview Of Public-Key Cryptology

in DPP 2003: International Conference on Digital Production Printing and Industrial Applications (2003)

An overview of the Eight International Olympiad in Cryptography "Non-Stop University CRYPTO"

E-print/Working paper (2022)

Non-Stop University CRYPTO is the International Olympiad in Cryptography that was held for the eight time in 2021. Hundreds of university and school students, professionals from 33 countries worked on ... [more ▼]

Non-Stop University CRYPTO is the International Olympiad in Cryptography that was held for the eight time in 2021. Hundreds of university and school students, professionals from 33 countries worked on mathematical problems in cryptography during a week. The aim of the Olympiad is to attract attention to curious and even open scientific problems of modern cryptography. In this paper, problems and their solutions of the Olympiad’2021 are presented. We consider 19 problems of varying difficulty and topics: ciphers, online machines, passwords, binary strings, permutations, quantum circuits, historical ciphers, elliptic curves, masking, implementation on a chip, etc. We discuss several open problems on quantum error correction, finding special permutations and s-Boolean sharing of a function, obtaining new bounds on the distance to affine vectorial functions. [less ▲]

An overview of the limitations to the dissemination of data

Presentation (2015, June 03)

The changes occurred during the last decades have made data one of the most important business assets. With this evolution, together with the no man's land that the Internet was in its early years, came ... [more ▼]

The changes occurred during the last decades have made data one of the most important business assets. With this evolution, together with the no man's land that the Internet was in its early years, came the awareness of the inherent dangers and potential damages involved in collecting and transferring data. Therefore, the attention of lawmakers has focused more and more on addressing the various risks related to this new asset. Limitations exist under different perspectives, sometimes protecting private interests, sometimes public. Rules impose limitations on the basis of traffic in arms; trade secret; copyright and author's rights; and, most prominently, the protection of personal data. The last topic is particularly complex. The Internet has drastically changed the landscape for the protection of personal data, and the existing patchwork of rules is no longer adequate. The very ownership of the data has been overthrown, making it hard to understand where liability rests. The changing context calls for a major revision of the existing rules on data protection. The European Union is discussing the reform, with provisions that are more high-level, but introducing significant penalties for violations. However, the reform is facing delays and difficulties, and it is still unknown when it will enter into force. [less ▲]

Overview of the S-adic conjecture

Presentation (2012, June)

Overview of the S-adic conjecture

Scientific Conference (2012, January)