22 research outputs found
Unlocking Security: Pioneering a Novel Elliptic Curve-Based Hashing Scheme
No full textLow-power networks and devices are becoming increasingly prevalent globally. These networks facilitate the exchange of concise messages, such as measurements and instructions. However, ensuring security, particularly concerning message integrity and sender authentication, presents a challenge in constrained environments. This article introduces a major breakthrough in the field of cryptography through the development of an innovative hash function leveraging the torsion subgroup on an elliptic curve. By incorporating the unique properties of this group, our approach redefines data security standards. We demonstrate the heightened resilience of our hash function against current attacks while maintaining exceptional performance. This novel method represents a significant advancement in safeguarding sensitive information, paving the way for more robust cybersecurity and practical applications across various domains. Experimental results confirm the effectiveness and security of our approach, establishing new perspectives for the evolution of modern cryptography
Unlocking Security: Pioneering a Novel Elliptic Curve-Based Hashing Scheme
No full textLow-power networks and devices are becoming increasingly prevalent globally. These networks facilitate the exchange of concise messages, such as measurements and instructions. However, ensuring security, particularly concerning message integrity and sender authentication, presents a challenge in constrained environments. This article introduces a major breakthrough in the field of cryptography through the development of an innovative hash function leveraging the torsion subgroup on an elliptic curve. By incorporating the unique properties of this group, our approach redefines data security standards. We demonstrate the heightened resilience of our hash function against current attacks while maintaining exceptional performance. This novel method represents a significant advancement in safeguarding sensitive information, paving the way for more robust cybersecurity and practical applications across various domains. Experimental results confirm the effectiveness and security of our approach, establishing new perspectives for the evolution of modern cryptography
Une copie de la Muqaddima de l'exemplaire du Kitāb al-'Ibar offert par Ibn-Haldūn à l'Université Al-Qarawiyîn de Fès
No full textA copy of the Muqaddima of the lost Kitäb al-'Ibar given by Ibn Haldün to the Al-Qarawiyln University at Fes.
First noticed in the 18th century by al-Maggarf, the so called « Fes manuscript » of the Kitäb al-'Ibar took the Orientalists' attention in the early 19th century. Unfortunately for almost a hundred years it was not accessible to scholars and when they could look at, out of the seven books send by Ibn Haldün himself from Cairo to the library of the well-known al-Qarawijin University at Fes, two only were surviving, may be three according to a description given on 1961. The contradictory informations about these two or three items are not enough for scholars and the most quoted manuscript of Ibn Haldün's historical work remains anyway the less known.
The original manuscript is now incomplete but its copies, and those especially containing the lost parts, have unfortunately been thoroughly neglected. There are actually many of them, one of which is a copy acquired in 1841 by the Bibliothèque nationale of Paris. This manuscript, which the author has discovered, containing the Prolegomena and being certainly a direct copy of the lost original, will take a very important part in the text tradition.Signalé au XVIIe siècle par al-Maqqarî, le manuscrit du Kitäb al-'Ibar dit « manuscrit de Fès » attira l'attention des orientalistes dès le début du XIXe siècle. Mais, durant un siècle encore, il demeurera inaccessible aux chercheurs. Et quand, au XIXe siècle, ils purent le consulter, il n'en subsistait plus que deux volumes — trois selon une notice publiée en 1961 — sur les sept envoyés du Caire par Ibn Haldün lui-même à la bibliothèque de la célèbre Université al-Qarawiyîn. Mais les descriptions contradictoires de ces deux ou trois volumes laissent sur sa faim le chercheur scrupuleux. Ainsi, le manuscrit le plus décrit de l'œuvre historique d'Ibn Haldün reste encore le moins bien connu.
L' « original » étant incomplet, on se serait attendu à ce que l'on s'intéressât à ses copies, et tout spécialement à celles des parties considérées comme perdues. Il n'en est malheureusement rien. Or, il en existe de nombreuses parmi lesquelles celle entrée à la Bibliothèque nationale en 1841 et qui ne fut jamais identifiée. Elle représente les Prolégomènes dont l'original n'a pas encore été retrouvé. C'est dire l'importance de ce manuscrit que nous regardons, par ailleurs, comme une copie directe de cet original.Redjala Mbarek. Une copie de la Muqaddima de l'exemplaire du Kitāb al-'Ibar offert par Ibn-Haldūn à l'Université Al-Qarawiyîn de Fès. In: Revue d'histoire des textes, bulletin n°3 (1973), 1974. pp. 193-201
Author manuscript, published in "ICTTA (2004)" Semantic Video Content Indexing and Retrieval using Conceptual Graphs
No full textIn this article, we propose a conceptual model for video content description. This model is an extension of the EMIR model proposed for image representation and retrieval. The proposed extensions include the addition of some views such as temporal and event views that are specific to video documents, the extension of the structural view to the temporal structure of video documents, and the extension of the perceptive view to motion descriptors. We have kept the formalism of conceptual graphs for the representation of the semantic content. The various concepts and relations involved can be taken from general and/or domain specific ontologies and completed by lists of instances (individuals). The proposed model has been applied on TREC video 2002 and 2003 corpora that mainly contain TV news and commercials videos
ECASS: an encryption compression aggregation security scheme for secure data transmission in ambient assisted living systems
No full textConsiderable efforts are being spent worldwide to ensure comfortable living environments and decent, on-time assistance to elderly and people requiring healthcare services. Recent advances in data acquisition and communication are allowing revolutionary ambient assisted leaving (AAL) systems to be implemented, where healthcare data are collected and reported on-the-fly to dedicated medical servers for further analysis and actions. Due to the increasing rely on distributed, resource constrained sensing devices, AAL systems are being subject to large number of attacks. In addition to usual high energy consumption and communication overhead, current systems are not yet able to fully safeguard the private data of their users. To overcome these shortcomings, we propose in this paper to combine the use of cryptography, compressed sensing, and steganography into a new generic solution called Encryption Compression Aggregation Security Scheme (ECASS). While focusing on the specific case of Medical Healthcare Systems, ECASS aims to secure private data exchanges over wireless networks while achieving lower energy consumption and communication overhead. Our simulations with the NS-2.35 simulator are showing an improvement of 40 and 50% in terms of energy consumption and communication overhead respectively compared to the IBE-Lite security scheme.Mbarek, B (reprint author), German Univ Technol Oman GUtech, Athaibah, Oman.
[email protected]; [email protected]; [email protected]
Author manuscript, published in "Content-Based Multimedia Indexing (CBMI2005) (2005)" SPEAKER IDENTITY INDEXING IN AUDIO-VISUAL DOCUMENTS
No full textThe identity of persons in audiovisual documents represents very important semantic information for content-based indexing and retrieval. The task of speaker’s identity detection can be carried out by exploiting data elements resulting from different modalities (text, image and audio). In this article, we propose an approach for speaker identity indexing in broadcast news using audio content. After a speaker segmentation phase, an identity is given to speech segments by applying linguistic patterns to their transcription from speech recognition. Three types of patterns are used to predict the speaker in the previous, current and next speech segments. Predictions are then propagated to other segments by similarity at the acoustic level. Evaluations have been conducted on part of the TREC 2003 corpus: a speaker identity could be assigned to 53 % of the annotated corpus with an 82 % precision. 1
Financial Deepening and Economic Growth in the European Transition Economies
No full textVarious effects of the financial deepening came to the centre of academics as well as policy-makers discussions during last four decades especially in relation to the financial sector development. Together with financial liberalization and international financial integration economists focus their attention to the financial deepening especially due to its potential effects on the real economy. Perspective of the fast and sustainable economic growth at the end of the 1990s increased an attractiveness of the European transition economies (ETE) for the foreign investors that resulted in increased foreign capital inflows to ETE. International capital inflows (especially debt and portfolio capital flows) stimulate financial deepening through higher demand for financial services. As the underdeveloped financial markets obviously constrain domestic capital mobilization, the international financial integration is considered to be very useful vehicle in fostering financial sector advancement. One of the most discussed areas related to the overall effects of the financial deepening is a bi-directional relationship between financial development and economic growth. It is generally expected there is a positive effect of financial development on economic growth. On the other hand especially some country-specific institutional characteristics and different policies may significantly distort positive incentives of the financial deepening. In the paper we analyze the main aspects of the financial deepening in ten ETE in the period 2000-2010 using vector error correction model (VECM). In order to meet this objective we implement a multivariate cointegration methodology introduced by Johansen (1988, 1991) and Johansen and Juselius (1990) to estimate the relationships between financial depth indicators and real output in the selected group of countries. To find the order of integration of endogenous variables we test the time series for the unit root presence. In order to determine cointegrating (long-run) relationships, we follow a Johansen cointegration procedure to perform the trace test and maximum eigenvalue test. We also test the direction of the causality relationships between financial depth indicators and real output using linear Granger causality test. Using the estimated VEC model, the dynamic responses of the endogenous variables to the money stock, domestic bank deposits and domestic bank loans one standard deviation shocks are computed for each country from the group of ETE.financial deepening, economic growth, vector error correction model, granger causality, impulse-response function
Forging the Path to Precision Medicine in Qatar: A Public Health Perspective on Pharmacogenomics Initiatives
No full textPharmacogenomics (PGx) is an important component of precision medicine that promises tailored treatment approaches based on an individual’s genetic information. Exploring the initiatives in research that help to integrate PGx test into clinical setting, identifying the potential barriers and challenges as well as planning the future directions, are all important for fruitful PGx implementation in any population. Qatar serves as an exemplar case study for the Middle East, having a small native population compared to a diverse immigrant population, advanced healthcare system, national genome program, and several educational initiatives on PGx and precision medicine. This paper attempts to outline the current state of PGx research and implementation in Qatar within the global context, emphasizing ongoing initiatives and educational efforts. The inclusion of PGx in university curricula and healthcare provider training, alongside precision medicine conferences, showcase Qatar’s commitment to advancing this field. However, challenges persist, including the requirement for population specific implementation strategies, complex genetic data interpretation, lack of standardization, and limited awareness. The review suggests policy development for future directions in continued research investment, conducting clinical trials for the feasibility of PGx implementation, ethical considerations, technological advancements, and global collaborations to overcome these barriers.The author(s) declare financial support was received for the research, authorship, and/or publication of this article. Funding from the Qatar University and Hamad Bin Khalifa University are greatly acknowledged. The funders had no role in the study design, analysis or reporting
2025 Focused Update of the 2019 ESC/EAS Guidelines for the management of dyslipidaemias
No full text1. Preamble; 2. Introduction; 3. Estimation of total cardiovascular risk and implications for dyslipidaemia management; 4. New low-density lipoprotein cholesterol-lowering therapies; 5. Combination of lipid-lowering therapies during index hospitalization for acute coronary syndromes; 6. Lipoprotein(a); 7. Hypertriglyceridaemia; 8. Primary prevention in people with human immunodeficiency virus infection; 9. Patients with cancer at high or very high chemotherapy-related cardiovascular toxicity risk; 10. Dietary supplements; 11. Evidence tables; 12. Data availability statement; 13. Author information; 14. Appendix; 15. Reference
Multiwavelength Observations of a Jet Launch in Real Time from the Post-changing-look Active Galaxy 1ES 1927+654
No full text\ua9 2025. The Author(s).We present results from a high-cadence multiwavelength observational campaign of the enigmatic changing-look active galactic nucleus 1ES 1927+654 from 2022 May to 2024 April, coincident with an unprecedented radio flare (an increase in flux by a factor of ∼60 over a few months) and the emergence of a spatially resolved jet at 0.1–0.3 pc scales. Companion work has also detected a recurrent quasi-periodic oscillation (QPO) in the 2–10 keV band with an increasing frequency (1–2 mHz) over the same period. During this time, the soft X-rays (0.3–2 keV) monotonically increased by a factor of ∼8, while the UV emission remained nearly steady with <30% variation and the 2–10 keV flux showed variation by a factor ≾2. The weak variation of the 2–10 keV X-ray emission and the stability of the UV emission suggest that the magnetic energy density and accretion rate are relatively unchanged and that the jet could be launched owing to a reconfiguration of the magnetic field (toroidal to poloidal) close to the black hole. Advecting poloidal flux onto the event horizon would trigger the Blandford–Znajek mechanism, leading to the onset of the jet. The concurrent softening of the coronal slope (from Γ = 2.70 \ub1 0.04 to Γ = 3.27 \ub1 0.04), the appearance of a QPO, and the low coronal temperature (kTe = 8-+38 keV) during the radio outburst suggest that the poloidal field reconfiguration can significantly impact coronal properties and thus influence jet dynamics. These extraordinary findings in real time are crucial for coronal and jet plasma studies, particularly as our results are independent of coronal geometry
