High-Performance Data Compression-Based Design for Dynamic IoT Security Systems

IoT technology is evolving at a quick pace and is becoming an important part of everyday life. Consequently, IoT systems hold large amounts of data related to the user of the system that is vulnerable to security breaches. Thus, data collected by IoT systems need to be secured efficiently without affecting the IoT systems’ performance and without compromising security as well. In this paper, a high-performance dynamic security system is introduced. The system makes use of the ZedBoard’s dynamic partial reconfiguration capability to shift between three distinct cipher algorithms: AEGIS, ASCON, and DEOXYS-II. The switching between the three algorithms is performed using two different techniques: the algorithm hopping technique or the power adaptive technique. The choice of which technique to be used is dependent on whether the system needs to be focused on performance or power saving. The ciphers used are the CAESAR competition finalists that achieved the greatest results in each of the three competition categories, where each cipher algorithm has its own set of significant characteristics. The proposed design seeks to reduce the FPGA reconfiguration time by the application of LZ4 (Lempel-Ziv4) compression and decompression techniques on the ciphers’ bitstream files. The reconfiguration time decreased by a minimum of 38% in comparison to the state-of-the-art design, while the resource utilization increased by approximately 2%

The influence of size and shape of Neodymium-doped:Yttrium Aluminium Garnet (Nd:YAG) laser capsulotomy on visual acuity and refraction

Background: Posterior capsule opacification is the most common complication of cataract surgery and results from the proliferation and migration of residual lenticular epithelial cells. Opacification may be diminished by atraumatic surgery; complete cleaning of cortex residues, polishing of both anterior and posterior capsules, clinical, pathological and experimental studies have shown that use of hydrodissection, the continuous curvilinear capsulorhexis or the use of specific intraocular lens (IOL) designs. The overall incidence of posterior capsule opacification (PCO) approaches 50% at 5 years following cataract surgery and disproportionately affects younger patients due to higher cell proliferation rates. Capsular-fixated, one-piece all-polymethylmethacrylate PC-IOLs with a Cshaped loop configuration and a posterior convexity of the optic are effective in reducing PCO. Objectives:To evaluate the influence of size and shape of neodymium: yttrium aluminum- Garnet (Nd:YAG) laser capsulotomy on visual acuity and refraction. Patients and method(s): A prospective study was performed in department of ophthalmology at Qena university hospital between September 2016 and September 2017. Informed consent was obtained from each patient before the study. A South Valley University institutional ethics committee approval was obtained. In this study 60 pseudophakic eyes of 58 patients of age range (30-70years) were included. All of the patients had undergone non complicated cataract surgery (phacoemulsification (48eyes) or extracapsular cataract extraction (12 eyes)). Result(s): All patients had significant vision loss and hazy fundus appearance due to posterior capsular opacification. There was significant improvement in VA in the four groups, with statistically significant improvement effect of cruciate shape capsulotomy with size >3.5mm on BCVA. Conclusion:The cruciate 0shape with size more than 3.5 mm capsulotomy openings show better improvement in BCVA than the other groups. Spherical equivalent show slight improvement in all groups which was insignificant

A Stakeholder Perspective of Sustainable Supply Chain Management

Industrialization leaves no doubt that our planet is suffering from global warming, depletion of natural resources, pollution, waste, and other environmental concerns. Consequently, businesses, communities, and governments have been environmentally conscious and shown growing concern for sustainable development, particularly following the establishment of the United Nations Environmental Program (UNEP). This chapter provides further insights into sustainability and supply chain research through adopting a stakeholder perspective to understand drivers and consequences of supply chain sustainability in the United Arab Emirates. The results indicate that pressures enforced by champions and customers are positively related to supply chain sustainability. However, the relationship between government pressures and supply chain sustainability is insignificant. Moreover, the findings provide evidence that the impact of supply chain sustainability on the organizational sustainable performance is significantly positive. Supply managers can learn from these results in developing sustainable initiatives earlier along their supply chain through selecting and evaluating suppliers based on sustainability-related standards. In addition, environmental collaboration with customers and suppliers based on knowledge sharing and application may identify and reduce the total environmental impact. </jats:p