The control over personal data: True remedy or fairy tale ?

This research report undertakes an interdisciplinary review of the concept of "control" (i.e. the idea that people should have greater "control" over their data), proposing an analysis of this con-cept in the field of law and computer science. Despite the omnipresence of the notion of control in the EU policy documents, scholarly literature and in the press, the very meaning of this concept remains surprisingly vague and under-studied in the face of contemporary socio-technical environments and practices. Beyond the current fashionable rhetoric of empowerment of the data subject, this report attempts to reorient the scholarly debates towards a more comprehensive and refined understanding of the concept of control by questioning its legal and technical implications on data subject\^as agency

Regularity of the Hardy-Littlewood maximal operator on block decreasing functions

We study the Hardy-Littlewood maximal operator defined via an unconditional norm, acting on block decreasing functions. We show that the uncentered maximal operator maps block decreasing functions of special bounded variation to functions with integrable distributional derivatives, thus improving their regularity. In the special case of the maximal operator defined by the l_infty-norm, that is, by averaging over cubes, the result extends to block decreasing functions of bounded variation, not necessarily special.Comment: 26 page

Frameless ALOHA with Reliability-Latency Guarantees

One of the novelties brought by 5G is that wireless system design has increasingly turned its focus on guaranteeing reliability and latency. This shifts the design objective of random access protocols from throughput optimization towards constraints based on reliability and latency. For this purpose, we use frameless ALOHA, which relies on successive interference cancellation (SIC), and derive its exact finite-length analysis of the statistics of the unresolved users (reliability) as a function of the contention period length (latency). The presented analysis can be used to derive the reliability-latency guarantees. We also optimize the scheme parameters in order to maximize the reliability within a given latency. Our approach represents an important step towards the general area of design and analysis of access protocols with reliability-latency guarantees.Comment: Accepted for presentation at IEEE Globecom 201

Cinètica de la reacció de descomposició tèrmica de l’ascaridol en dissolució

Existen diferencias entre los valores de algunas propiedades físicas de ascaridol natural aislado del vegetal denominado vulgarmente «Paico» (Chenopodium ambrosioides L., Chenopodiaceae) y la sustancia sintética obtenida mediante la reacción de fotooxigenación de α-terpineno. Es más, el uso de decocciones de dicha planta, utilizadas como medicina antihelmíntica en los humanos, ha despertado un debate científico debido a las propiedades tóxicas atribuídas a su principio activo (ascaridol), el cual sería responsable de la muy conocida acción beneficiosa. En este trabajo se ha realizado la preparación de esa sustancia por el método de Schenck, pero trabajando a 0 ºC con alcohol isopropílico como solvente y efectuando su separación y purificación a temperatura ambiente por cromatografía en columna preparativa, a fin de prevenir su degradación térmica. De esta manera se obtuvieron excelentes rendimientos de ascaridol (ca. 99% GC-FID), de un alto grado de pureza (> 98% GC; RP-HPLC; 1 H y 13C RMN). Además, se informan aquí los parámetros de activación de la reacción de descomposición térmica de ascaridol en solución de n-hexano, alcohol isopropílico y metanol, en el ámbito de temperaturas de 120ºC a 170ºC. Es evidente también un efecto de solvente en la homólisis unimolecular de esa sustancia.Discrepancies exist between the values of some physical properties of ascaridole isolated from the vegetal named «Paico» (Chenopodium ambrosioides L., Chenopodiaceae) and the synthetic substance obtained by the photoxygenation reaction of α-terpinene. Moreover, the use of decoctions of the above mentioned plant as anthelmintic medicine in humans arouse a scientific debate because of toxic properties attributed to its main active drug (ascaridole), which would be responsible of the well-known beneficial action. This lead to perform here the preparation of that substance by Schenck’s method, but working at 0 ºC with isopropyl alcohol as solvent and doing its separation and purification at room temperature by preparative column chromatography to prevent its thermal degradation. Thus, excellent yields of ascaridole were obtained (ca. 99 % GC-FID) of high degree of purity (> 98% GC; RP-HPLC; 1 H and 13C NMR). Furthermore, the kinetics of the thermal stability of ascaridole in solution is now advanced, reporting the activation parameters values for their decomposition reactions in n-hexane, isopropyl alcohol and methanol, in the 120º170 ºC temperature range. A solvent effect on the unimolecular homolysis of that substance is also evident.  Hi ha diferències entre els valors d’algunes propietats fisiques de l’ascaridol natural, aïllat del vegetal dit vulgarment «Paico» (Chenopodium ambrosioides L., Chenopodiaceae), i la substància sintètica obtinguda mitjançant la reacció de fotooxigenació d’α-terpinè. Encara més, l’ús de decoccions de l’esmentada planta, emprades com a medicina antihelmíntica en humans, ha despertat un debat científic, donades les propietats tòxiques atribuïdes al seu principi actiu (ascaridol), que seria el responsable de la molt coneguda acció beneficiosa. En aquest treball, s’ha realitzat la preparació d’aquesta substància pel mètode de Schenck, però treballant a 0 ºC amb alcohol isopropílic com a dissolvent i efectuant la seva separació i purificació a temperatura ambient mitjançant cromatografia de columna preparativa, per tal de prevenir la seva degradació tèrmica. D’aquesta manera, s’obtenen excel.lents rendiments d’ascaridol (ca. 99% GC-FID), d’un alt grau de puresa (> 98% GC; RP-HPLC; 1 H i 13C RMN). A més, es presenten els paràmetres d’activació de la reacció de descomposició tèrmica de l’ascaridol en dissolució de n-hexà, alcohol isopropílic i metanol, en el marge de temperatures de 120ºC a 170 ºC. Així mateix, és evident un efecte del dissolvent en l’homòlisi unimolecular d’aquesta substància.Fil: Cafferata, Lazaro. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Departamento de Química. Laboratorio de Estudio de Compuestos Orgánicos; ArgentinaFil: Jeandupeux, R.. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Departamento de Química. Laboratorio de Estudio de Compuestos Orgánicos; ArgentinaFil: Cañizo, Adriana Ines. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Departamento de Química. Laboratorio de Estudio de Compuestos Orgánicos; Argentin

Management system requirements for wireless systems beyond 3G

This paper presents a comprehensive description of various management system requirements for systems beyond 3G, which have been identified as a result of the Software Based Systems activities within the Mobile VCE Core 2 program. Specific requirements for systems beyond 3G are discussed and potential technologies to address them proposed. The analysis has been carried out from network, service and security viewpoints

Dynamics and bifurcations in a simple quasispecies model of tumorigenesis

Cancer is a complex disease and thus is complicated to model. However, simple models that describe the main processes involved in tumoral dynamics, e.g., competition and mutation, can give us clues about cancer behaviour, at least qualitatively, also allowing us to make predictions. Here we analyze a simplified quasispecies mathematical model given by differential equations describing the time behaviour of tumor cells populations with different levels of genomic instability. We find the equilibrium points, also characterizing their stability and bifurcations focusing on replication and mutation rates. We identify a transcritical bifurcation at increasing mutation rates of the tumor cells population. Such a bifurcation involves an scenario with dominance of healthy cells and impairment of tumor populations. Finally, we characterize the transient times for this scenario, showing that a slight increase beyond the critical mutation rate may be enough to have a fast response towards the desired state (i.e., low tumor populations) during directed mutagenic therapies