76 research outputs found
SEMBA:SEcure multi-biometric authentication
Biometrics security is a dynamic research area spurred by the need to protect
personal traits from threats like theft, non-authorised distribution, reuse and
so on. A widely investigated solution to such threats consists in processing
the biometric signals under encryption, to avoid any leakage of information
towards non-authorised parties. In this paper, we propose to leverage on the
superior performance of multimodal biometric recognition to improve the
efficiency of a biometric-based authentication protocol operating on encrypted
data under the malicious security model. In the proposed protocol,
authentication relies on both facial and iris biometrics, whose representation
accuracy is specifically tailored to trade-off between recognition accuracy and
efficiency. From a cryptographic point of view, the protocol relies on SPDZ a
new multy-party computation tool designed by Damgaard et al. Experimental
results show that the multimodal protocol is faster than corresponding unimodal
protocols achieving the same accuracy
Hydrus microstent compared to selective laser trabeculoplasty in primary open angle glaucoma: one year results
Is trabecular sugery (Hydrus-Ivantis) really safe? Operative and post-operative complications of a single site clinical group
Managing Drawbacks in Unconventional Successful Glaucoma Surgery: A Case Report of Stent Exposure
Traditional options in managing failed trabeculectomy (bleb needling, revision, additional incisional surgery and tube surgery) have a relatively high failure and complication rate. The use of microinvasive glaucoma surgery (MIGS) has generally been reserved to mild to moderate glaucoma cases, proving good safety profiles but significant limitations in terms of efficacy.
We describe a patient who underwent MIGS (XEN Aquesys subconjunctival shunt implantation) after a prior failed trabeculectomy. After the surgery, the IOP was well controlled but as the stent was close to an area of scarred conjunctiva of the previous trabeculectomy, it became partially exposed. As a complete success was achieved, we decided to remove the conjunctiva over the exposed area and replace it by an amniotic membrane transplantation and a conjunctiva autograft. Six months after surgery, the unmedicated IOP is still well controlled with complete visual acuity recovery
Comparison of UV, Peracetic Acid and Sodium Hypochlorite Treatment in the Disinfection of Urban Wastewater
One source of water contamination is the release of wastewater that has not undergone
efficient treatment. The aim of this study was to evaluate the reduction obtained with sodium
hypochlorite (NaClO), UV and peracetic acid disinfection treatment of Salmonella spp., pathogenic
Campylobacter, STEC and bacterial indicators in three full-scale municipal wastewater plants. A
general reduction in Salmonella was observed after disinfection, but these bacteria were detected
in one UV-treated sample (culture method) and in 33%, 50% and 17% of samples collected after
NaClO, UV and PAA disinfection treatments, respectively (PCR method). A better reduction was
also observed under NaClO disinfection for the microbial indicators. Independent of the disinfection
treatment, E. coli O157:H7 was not detected in the disinfected samples, whereas some samples treated
with UV and PAA showed the presence of the stx1 gene. No reduction in the presence of stx2 genes
was verified for any of the disinfection treatments. Campylobacter was not detected in any of the
analysed samples. The overall results highlight a better reduction in microbiological parameters with
a NaClO disinfection treatment in a full-scale municipal wastewater plant compared with UV and
PAA. However, the results indicate that a complete and specific monitoring program is necessary to
prevent a possible risk to public health
Anterior segment OCT and confocal microscopy can be predictive of the bleb failure of a new minimally invasive glaucoma surgery technique, the XEN implant (Aquesys)?
Recent developments in the management of dry age-related macular degeneration
Dry age-related macular degeneration (AMD), also called geographic atrophy, is characterized by the atrophy of outer retinal layers and retinal pigment epithelium (RPE) cells. Dry AMD accounts for 80% of all intermediate and advanced forms of the disease. Although vision loss is mainly due to the neovascular form (75%), dry AMD remains a challenge for ophthalmologists because of the lack of effective therapies. Actual management consists of lifestyle modification, vitamin supplements, and supportive measures in the advanced stages. The Age-Related Eye Disease Study demonstrated a statistically significant protective effect of dietary supplementation of antioxidants (vitamin C, vitamin E, beta-carotene, zinc, and copper) on dry AMD progression rate. It was also stated that the consumption of omega-3 polyunsaturated fatty acids, such as docosahexaenoic acid and eicosapentaenoic acid, has protective effects. Other antioxidants, vitamins, and minerals (such as crocetin, curcumin, and vitamins B9, B12, and B6) are under evaluation, but the results are still uncertain. New strategies aim to 1) reduce or block drusen formation, 2) reduce or eliminate inflammation, 3) lower the accumulation of toxic by-products from the visual cycle, 4) reduce or eliminate retinal oxidative stress, 5) improve choroidal perfusion, 6) replace/repair or regenerate lost RPE cells and photoreceptors with stem cell therapy, and 7) develop a target gene therapy
The effect of the Hydrus trabecular Shunt on endothelial cell count:a double blind prospective randomized clinical study.
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