Wink: Deniable Secure Messaging

End-to-end encrypted (E2EE) messaging is an essential first step towards combating increasingly privacy-intrusive laws. Unfortunately, it is vulnerable to compelled key disclosure -- law-mandated, coerced, or simply by device compromise. This work introduces Wink, the first plausibly-deniable messaging system protecting message confidentiality even when users are coerced to hand over keys/passwords. Wink can surreptitiously inject hidden messages in the standard random coins (e.g., salt, IVs) used by existing E2EE protocols. It does so as part of legitimate secure cryptographic functionality deployed inside widely-available trusted execution environments (TEEs) such as TrustZone. This provides a powerful mechanism for hidden untraceable communication using virtually unchanged unsuspecting existing E2EE messaging apps, as well as strong plausible deniability. Wink has been demonstrated with multiple existing E2EE applications (including Telegram and Signal) with minimal (external) instrumentation, negligible overheads, and crucially without changing on-wire message formats

Simplified Power Allocation for the DSL Multi-access Channel through Column-wise Diagonal Dominance

In the newest generation of DSL systems, crosstalk is the dominant source of performance degradation. Many crosstalk cancellation schemes have been proposed. These schemes typically employ some form of co-ordination between modems and lead to large performance gains. The use of crosstalk cancellation means that power allocation should be viewed as a multi-user problem. In this paper we investigate optimal (i.e. capacity maximizing) power allocation in DSL systems which employ co-ordination to facilitate crosstalk cancellation. By exploiting certain properties of the DSL channel, it is shown that power allocation can be simplified considerably. The result has each user waterfilling against the background noise only, explicitly ignoring the interference from other users. We show this to be near-optimal for upstream DSL when Central Office (CO) modems are co-ordinated. Compared with conventional waterfilling which is done against the background noise and interference, the performance gains are significant

Simplified Power Allocation and TX/RX Structure for MIMO-DSL

In the newest generation of DSL systems crosstalk is the dominant source of performance degradation. Many crosstalk cancellation schemes have been proposed. These schemes typically employ some form of co-ordination between modems and lead to large performance gains. The use of crosstalk cancellation means that power allocation should be viewed as a multi-user problem. In this paper we investigate optimal (ie. capacity maximizing) power allocation in DSL systems which employ co-ordination to facilitate crosstalk cancellation. By exploiting certain properties of the DSL channel it is shown that power allocation can be simplified considerably. The result has each user waterfilling against the background noise only, explicitly ignoring the interference from other users. We show this to be near-optimal for upstream DSL when Central Office (CO) modems are co-ordinated. Compared with conventional waterfilling which is done against the background noise and interference, the performance gains are significant

Carbohydrates Impact in Type 2 Diabetes in Cats

Diabetes is one of the most commonly diagnosed endocrine diseases in cats. Of all types of diabetes, type II is the most frequent one, 80% of the diabetic cats have type II diabetes. Even though it’s a multifactorial disease, obesity was found to be the most important risk factor in developing diabetes, obesity increases the chances of developing this disease to up to 4 times. The study was conducted on a number of 9 cats with uncomplicated diabetes with the purpose of monitoring the effects of the commercial dry food (with a high percentage of carbohydrates) and the commercial canned food (with a higher percentage of proteins and a lower percentage of carbohydrates) on the glycemic index. For this study, we considered the occasional administration of raw chicken and turkey meat because it wasn’t given for a long enough period of time. The diet is very important for diabetic cats because a lot of sick cats enter remission after a couple of months of being fed wet canned food and they no longer need the administration of insulin, but owners are instructed to carefully monitor glycaemia for the rest of the pet’s life

Global random walk solvers for fully coupled flow and transport in saturated/unsaturated porous media

In this article, we present new random walk methods to solve flow and transport problems in saturated/unsaturated porous media, including coupled flow and transport processes in soils, heterogeneous systems modeled through random hydraulic conductivity and recharge fields, processes at the field and regional scales. The numerical schemes are based on global random walk algorithms (GRW) which approximate the solution by moving large numbers of computational particles on regular lattices according to specific random walk rules. To cope with the nonlinearity and the degeneracy of the Richards equation and of the coupled system, we implemented the GRW algorithms by employing linearization techniques similar to the -scheme developed in finite element/volume approaches. The resulting GRW -schemes converge with the number of iterations and provide numerical solutions that are first-order accurate in time and second-order in space. A remarkable property of the flow and transport GRW solutions is that they are practically free of numerical diffusion. The GRW solvers are validated by comparisons with mixed finite element and finite volume solvers in one- and two-dimensional benchmark problems. They include Richards’ equation fully coupled with the advection-diffusion-reaction equation and capture the transition from unsaturated to saturated flow regimes.publishedVersio

A mixed finite element discretization scheme for a concrete carbonation model with concentration-dependent porosity

We discuss a prototypical reaction-diffusion-flow problem in saturated/unsaturated porous media. The special features of our problem are: the reaction produces water and therefore the flow and transport are coupled in both directions and moreover, the reaction may alter the microstructure. This means we have a variable porosity in our model. For the spatial discretization we propose a mass conservative scheme based on the mixed finite element method (MFEM). The scheme is semi-implicit in time. Error estimates are obtained for some particular cases. We apply our finite element methodology for the case of concrete carbonation – one of the most important physico-chemical processes affecting the durability of concrete

Session B8: Swimming Behaviour of Beluga and Stellate Sturgeons During Their Migration in the Lower Danube River

Abstract: The Lower Danube River (LDR) still supports three naturally self-sustaining species of anadromous sturgeons. Beluga sturgeons (Huso huso) and stellate sturgeons (A. stellatus) are still common while Russian sturgeons (Acipenser gueldenstaedti) became very rare. Studying their swimming behaviour is essential for understanding (i) the impact of construction works aiming to improve conditions for navigation; (ii) sturgeon behaviour in relation to Iron Gate hydropower and navigation systems; (iii) behaviour of young sturgeons during downstream migration towards the Black Sea. A significant number of wild adult sturgeons (N= 103; 39 beluga, 1 Russian and 63 stellate) was implanted with acoustic transmitters, with depth and temperature sensors, and their movements were tracked using arrays of submerged automatic receivers installed in the LDR (R Km 60 – 863) during 2009 – 2014. For some of these fish additional swimming depth data were obtained by manual tracking. Wild born young of the year (YOY) beluga sturgeons (N=27) were captured in the LDR (R Km 123), implanted with acoustic transmitters and released during routine monitoring (June 2010). YOY beluga sturgeons of hatchery origin (N=33) were implanted with acoustic transmitters and stocked in the LDR at R Km 300 and R Km 102 (August 2010). Their movements were tracked and recorded by arrays of submerged acoustic receivers installed on the main Danube (R Km 101) and the three branches of the delta. This paper analyses for the first time on the LDR consistent data (over 70,000 recordings) on swimming speed (upstream and downstream) and swimming depth behaviour of adult sturgeons (beluga and stellate), during spring and autumn migration season, and YOY beluga sturgeons of wild and hatchery origin

Seguimiento remoto de la recaída de hernia después de procesos abiertos de plastia de la pared abdominal– estudio prospectivo que incluye 142 pacientes

ResumenAntecedentesLa hernia incisional sigue siendo una complicación común de las laparotomías. El propósito del estudio es analizar la recidiva de hernia en un año, después de varios métodos abiertos de plastia de la pared abdominal.Material y métodosEstudio longitudinal prospectivo, en el que se incluyó a 142 pacientes. Se analizaron: los datos individuales, el grado de obesidad, las variaciones intraoperatorias de la presión abdominal, la intensidad del dolor postoperatorio, las complicaciones postoperatorias y los tipos de plastias de la pared abdominal: simple y con malla de polipropileno.ResultadosEl análisis del grupo estudiado estableció una tasa general de reincidencia de 16.9% y, en los 4 procesos, del 40.74% en caso de plastias simples, del 16.07% después de plastias onlay, del 6.97% después de plastias retromusculares y del 6.25% después de la sustitución completa de la avería parietal. Mediante el análisis de los datos obtenidos, la recidiva de la hernia fue significativamente correlacionada con: el grado de obesidad, las variaciones de la presión intraabdominal, el dolor postoperatorio y el tipo de procedimiento realizado.ConclusionesLa recurrencia de la hernia fue más frecuente en las plastias simples. Entre los procesos con malla, a la plastia onlay se le asignó una mayor tasa de recaídas y complicaciones postoperatorias. La recurrencia de la hernia fue más frecuente en las variaciones de la presión intraabdominal y con el dolor postoperatorio aumentado. La realización de la ecografía puede aumentar la precisión de la presencia de la hernia.AbstractBackgroundThe incisional hernia continues to be a frequent complication of laparotomies. The purpose of study is the analysis of hernia disease relapse after one year after different open plasties methods of the abdominal wall.Material and methodsA prospective longitudinal study was performed that included 142 patients. An analysis was performed on the individual data, the level of obesity, intra-surgical variations in intra-abdominal pressure, the intensity of post-surgical pain, the post-surgical complications, and the types of plasties of abdominal wall, simple and with polypropylene mesh.ResultsThe analysis of studied group showed a general rate of relapse of 16.9%, and within the 4 procedures, 40.74% in the case of simple plasties, of 16.07% after the only plasties, 6.97% after the retro-muscular plasties, and 6.25% after the full substitution of parietal defect. On analysing the collected, hernia relapse was statistically significantly related to the level of obesity, variations in intra-abdominal pressure, post-surgical pain, and the type of procedure performed.ConclusionsHernia is a frequent complication of laparotomies. Hernia relapse was more frequent in the case of simple plasties. Among the mesh procedures, the onlay plasty showed a higher rate of relapse and post-surgical complications. Hernia relapse was more frequent in the case of variations of intra-abdominal pressure, and with increased post-surgical pain. The use of an echography examination may increase the accuracy of the presence of hernia disease