Securing Information-Centric Networking without negating Middleboxes

Information-Centric Networking is a promising networking paradigm that overcomes many of the limitations of current networking architectures. Various research efforts investigate solutions for securing ICN. Nevertheless, most of these solutions relax security requirements in favor of network performance. In particular, they weaken end-user privacy and the architecture's tolerance to security breaches in order to support middleboxes that offer services such as caching and content replication. In this paper, we adapt TLS, a widely used security standard, to an ICN context. We design solutions that allow session reuse and migration among multiple stakeholders and we propose an extension that allows authorized middleboxes to lawfully and transparently intercept secured communications.Comment: 8th IFIP International Conference on New Technologies, Mobility & Security, IFIP, 201

Evaluating habitat suitability and spectral heterogeneity models to predict weed species presence

The aim of this study is to analyze whether the presence of weed species resistant to herbicides is related to landscape heterogeneity and environmental variables. C3 and C4 weed species, such as Chenopodium album, Conyza canadensis, Amaranthus retroflexus, Papaver rhoeas, Sorghum halepense, Echinochloa crus-galli and Lolium rigidum, are studied in two differing bioclimatic countries, Greece and Germany. Given the difficulties of field-based data collection, the use of remote sensing for estimating spatial patterns is as a powerful tool. To compare species presence with spatial heterogeneity, the Normal Difference Vegetation Index (NDVI) was used. A number of tools were applied such as regression models, Ordinary Least Square (OLS) and Logistic regression, Rank - abundance diagrams and Variograms of NDVI values. Moreover, to relate species distribution with environmental and bioclimatic variables Habitat Suitability (HS) models were produced. To make predictions of species future distribution, based on bioclimatic data, GARP models were used. Landscape area around species is highly heterogeneous. The species studied are related with low vegetated areas and are neither generalists nor specialists in their environment. The core factors affecting species distribution are mean temperature, and secondarily annual precipitation, in Greece, whereas altitude and bioclimatic conditions, in Germany. Weeds tend to move to higher altitudes, minimizing their population size, in future climatic conditions. However, C3 summer annual weeds, in Germany, and C3 winter annual weeds, in Greece, seem to be tolerant to climatic changes, and expand to new territories. The response of species range due to climatic changes, seems to be species-specific. Further study is needed to come up with prediction models of weed species future distributio

CoAP over ICN

The Constrained Application Protocol (CoAP) is a specialized Web transfer protocol for resource-oriented applications intended to run on constrained devices, typically part of the Internet of Things. In this paper we leverage Information-Centric Networking (ICN), deployed within the domain of a network provider that interconnects, in addition to other terminals, CoAP endpoints in order to provide enhanced CoAP services. We present various CoAP-specific communication scenarios and discuss how ICN can provide benefits to both network providers and CoAP applications, even though the latter are not aware of the existence of ICN. In particular, the use of ICN results in smaller state management complexity at CoAP endpoints, simpler implementation at CoAP endpoints, and less communication overhead in the network.Comment: Proc. of the 8th IFIP International Conference on New Technologies, Mobility and Security (NTMS), Larnaca, Cyprus, November, 201

Evaluation of autonomic imbalance in patients with heart failure: A preliminary study of pupillomotor function

Background: Purpose of this study was to examine pupil size changes and mobility in normal subjects and in heart failure (HF) patients. Methods: Sixteen stable patients with New York Heart Association (NYHA) class II or III heart failure and sixteen control subjects were studied. Pupillary reaction to light was recorded and nine parameters from this data were measured, reported and then compared in both groups of subjects. Results: Patients with HF had abnormal pupillary function compared with normal subjects. Pupillary light reflex variables differed significantly between two groups (p < 0.05) except baseline radius (R1), minimum radius (R2) and time for maximum constriction (T3). A significant decrease in maximum constriction velocity (VCmax; p < 0.001) and maximum constriction acceleration (ACmax; p < 0.001) was observed in HF subjects. Furthermore, significantly higher values in percentage recovery-redilatation (%R; p < 0.001), percentage R2/R1 (%R2/R1; p < 0.05), latency (T1; p < 0.05) and time for maximum velocity (T2; p < 0.05) were found in the same group. Conclusions: Of the parameters studied, R1 and %R are governed mainly by the action of the sympathetic nervous system, through norepinephrine. The rest are governed mainly by parasympathetic nervous system, through acetylcholine. The results of our study demonstrate generalized adrenergic activation and parasympathetic withdrawal, which are present in HF. (Cardiol J 2010; 17, 1: 65-72