Communications cryptography

In today's information age, communications play an important role which 1s contributed to the growth o f technologies. Electronic security is increasingly involved in making communications more prevalent. Therefore, a mechanism is needed to assure the security and privacy o f information that is sent over the electronic communications media is in need. Whether the communications media is wired o r wireless, both can be not protected from unauthorized reception or interception of transmission. The, method of transforming the original information into the unreadable format is called encryption and decryption of information. The study o f encryption and decryption is known as Cryptography. Cryptography or communication by using secret code was used by the Egyptians some 4000 years ago. However, t h e science of cryptography was initiated by Arabs since 600s. Cryptography becomes vital in the twentieth century where it played a crucial role in the World War I and 11. This paper focuses on the analysis of the two types of key cryptography exists, based on the availability of the key publicly: Private key Cryptography, and Public Key Cryptography. Both the sender and the recipient share a key that must be kept private. In the former case the sender and recipient share a private key between the two o f them which must be distributed first before actual communications take place. This analysis shows how much complicated and difficult to do properly. T h e most famous example o f t h i s type of cryptography is the Data Encryption Standard (DES). In the Public Key Cryptography, each party has two sets o f keys; one key is known to the public while the other is kept secret to the owner

A survey of routing MAC techniques for wireless sensor networks routing protocol

A Wireless Sensor Network (WSN) contains a random number of sensors distributed in the environment to monitor physical conditions. In the following, a survey of MAC routing mechanisms in WSN is presented and discussed. One of the most important issues in WSN is the issue of energy efficiency of the routing protocols. The importance of this issue stems from the fact that the nodes have usually a life time and this life time can be extended by saving more energy by using efficient routing techniques. In the following, we present a survey of the MAC routing mechanisms in WSN. Firstly, an outline of the architecture challenges for routing protocols in WSN is given according to the system tradeoffs between the power and communication overhead savings in different routing techniques. Secondly, advantages and disadvantages for each routing protocol are presented and discussed. In this survey, we will concentrate only on some protocols like Data Centric, Hierarchal and other related energy saving protocols. In addition, we will discuss some of the surveyed protocols results, comparisons and conclusions

Nexus between Intellectual Capital and Financial Performance Sustainability: Evidence from Listed Jordanian Firms

Purpose: The authors observe the effect of exploring the reality of Intellectual Capital (IC) and its impact on the financial performance of Jordanian industrial firms in Amman Stock Exchange. This empirical research explores the effect of intellectual capital on financial performance using data from 36 Jordanian industrial firms listed in Amman Stock Exchange for the period 2016-2020. The Value-Added Intellectual coefficient (VAIC) was adopted to measure the intellectual capital, while the return on assets (ROA), return on equity (ROE), and earnings per share (EPS) were adopted as measures of the companys financial performance. The effect of IC was tested by using statistical analysis, dependent on the data obtained from annual financial statements. The results showed that the IC has a significant and positive effect on profitability due to its significant effect on ROA and EPS. However, it has not been proven that IC affects the ROE. This research extends the research on IC and aims to enrich studies in this field, especially in the Jordanian market. It reflects the reality of Intellectual Capital and its impact on industrial firms’ performance in Jordan as an example of developing countrie

An MRI longitudinal study in Low back Pain Patients: Assessment of Disc Herniation Grade 2

Background: A herniated disc is assessed by Magnetic Resonance Imaging (MRI). We assessed a correlation between MRI findings at baseline and follow-up to determine whether there is an ability to predict future progress in LBP among LBP patients with moderate disc prolapse (grade 2-disc herniation). Method: This is was a prospective longitudinal study conducted at single center with  total of 65 patients , all of whom gave their informed consent to participate. Utilizing the Visual Analogue Scale (VAS), patients were approached to rate how extreme the back pain was and to complete the Roland Morris Disability Questionnaire for an evaluation of their disability. Then, the spine was assessed by MRI scan for all participants. Within 1.5 years of baseline MRI scan, 49 volunteers were repeat MRI scan for LBP patients. Result: The study found weak correlations between age, VAS  scores, disability index, and the presence of disc herniation and LBP patients with moderate prolapsed discs (grade 2-disc herniation). Pain and disability also had a weak relation with Grade 2 (r=0.13, r=0.05). In addition, most MRI findings did not demonstrate a significant association with future LBP severity, regardless of whether participants had a history of LBP or not (correlation coefficient, r=0.08, p=0.7) Conclusion: It was concluded that MRI findings in both ongoing and forthcoming studies do not exhibit a statistically noteworthy association with the magnitude and position of lumbar disc herniation, pain, and disability for LBP patient with grade 2 disc herniation

Agronomical, physiological and molecular evaluation reveals superior salt-tolerance in bread wheat through salt-induced priming approach

Salt stress significantly limit wheat crop productivity worldwide. Exposure to non-lethal levels of salt stress, referred to as "salt-priming", allows plants to persist subsequent lethal conditions; the priming effect continues even after an extended salt stress-free period. This study attempted to evaluate the effectiveness of the salt-induced priming approach to cope with the toxic effects of long-term salinity stress in wheat. After 22 days of gradual salt acclamation to reach 250 mM NaCl, plants were recovered for eight days and finally shocked with 250 mM NaCl (priming+shock) for 7 days. After that, physiological parameters and gene expression of six salt-responsive genes were assessed. Additionally, 120 days after germination (at the end of the season), agronomic traits were recorded. Analysis of the agronomical traits revealed higher productivity in the salt-pretreated group (priming+shock) plants than the non-pretreated (shock only). Consistently, salt-pretreated plants maintained higher photosynthetic pigments level and decreased proline and MDA content than non-pretreated, suggesting enhanced salt tolerance. Moreover, salt-pretreated plants sustained high expressional levels of salt-responsive genes (TaNHX1, TaSOS1, TaSOS4, TaHKT1, TaHKT2, and TaAKT1) comparing with non-pretreated, indicating a vital role in ion homeostasis and conferring salt tolerance. Ultimately, this finding could facilitate novel smart approaches to improve wheat productivity under salt stress

European Vitreoretinal Society Macular Hole Study, Prognostic Factors for Anatomical and Functional Success

Background: To identify prognostic preoperative and intraoperative factors for anatomical and visual success of idiopathic macular hole (MH) surgery. Methods: We conducted a non-randomized, collaborative multicenter study using data of 4207 MH surgery from 140 surgeons. Main study outcomes were anatomical closure and best corrected visual acuity (BCVA) improvement postoperative at 6-12 months. Results: Information on anatomical success was available for 4138 eyes of 4207 operations. Anatomical closure of MH was achieved in 85.7% (3546 eyes). Closure was higher in smaller MH (stages 1-2 versus stage 3: OR=0.35; stage 2 versus stage 4: OR=0.16, and in MH with shorter duration before the operation (OR=0.94). Macular Holes were more likely to close when dyes were used to facilitate internal limiting membrane (ILM) peeling (odds ratio=1.73 to 3.58). The most important predictors of postoperative BCVA were the preoperative BCVA (estimate=0.39, p<0.001) and closure of the macular hole (estimate=0.34, p<0.001). We observed Larger improvement in BCVA in combined vitrectomy and phacoemulsification (estimate = 0.10) and post cataract surgery in phakic eyes (estimate=0.05). Retinal tears occurred in 5.1% of eyes, and were less with use of trocars (OR= -1.246) and in combined vitrectomy/ phacoemulsification surgery (OR= -0.688). Conclusion: This international survey confirmed that staining with dyes improves anatomical results but not visual outcomes. After surgery, visual acuity improved during the first year, and final visual acuity was better in both pseudophakic eyes and eyes that underwent cataract surgery during the first year following MH repair

Characterization of antioxidant tapioca/polyaniline composites film prepared using solution casting method

Recently, the incorporation of polyaniline (PANI) as an additive into the biofilm to produce food packaging material is of particular interest due to the need to improve in the properties of the biocomposite film. The aim of this work is to evaluate the effect of concentration and size of PANI loading into the film on the antioxidant properties of PANI/starch film with the analysis of mechanical and Fourier-transform infrared spectroscopy (FTIR) spectra. Composite films with 0.02 g, 0.05 g, and 0.1 g of PANI loading into the tapioca starch film were prepared with different sizes of PANI. The antioxidant and mechanical properties of tapioca starch/PANI composite film properties were investigated. The composites exhibited an increase in free radical scavenging capacity (a measure of antioxidant activity), with increasing of PANI loading in the film irrespective to the size of PANI. However, the highest free radical scavenging activity showed in sample B with the distribution size of PANI range 100 µm≤x≤125 µm. In the mechanical test, with the favorable to have more flexibility film rather than hard film, sample B with 0.05 g of PANI loading showed more flexible with high elongation at break (EAB) compared to others. Based on the FTIR spectra, the starch/PANI film spectra were similar to the starch/glycerol without PANI. However, one notable weak pick near 1455 cm-1 can be found in sample B and C with respective to the concentration of PANI loaded. The incorporation of PANI greatly affected the antioxidant activity of the film which affected the mechanical properties as well

MAFC: Multi-Agent Fog Computing Model for Healthcare Critical Tasks Management

Producción CientíficaIn healthcare applications, numerous sensors and devices produce massive amounts of data which are the focus of critical tasks. Their management at the edge of the network can be done by Fog computing implementation. However, Fog Nodes suffer from lake of resources That could limit the time needed for final outcome/analytics. Fog Nodes could perform just a small number of tasks. A difficult decision concerns which tasks will perform locally by Fog Nodes. Each node should select such tasks carefully based on the current contextual information, for example, tasks’ priority, resource load, and resource availability. We suggest in this paper a Multi-Agent Fog Computing model for healthcare critical tasks management. The main role of the multi-agent system is mapping between three decision tables to optimize scheduling the critical tasks by assigning tasks with their priority, load in the network, and network resource availability. The first step is to decide whether a critical task can be processed locally; otherwise, the second step involves the sophisticated selection of the most suitable neighbor Fog Node to allocate it. If no Fog Node is capable of processing the task throughout the network, it is then sent to the Cloud facing the highest latency. We test the proposed scheme thoroughly, demonstrating its applicability and optimality at the edge of the network using iFogSim simulator and UTeM clinic data

Healthcare Administration Facilitating Neonatal Resuscitation Program Role Of Nursing, Midwifery, Clinical Laboratory And Radiological Teams In NRP

The purpose of this review was to investigate the level of knowledge that nurses and midwives, as well as the clinical laboratory and radiology team, have regarding neonatal resuscitation. Additionally, the review aimed to investigate the effect that education has on knowledge levels, as well as the role that healthcare administration plays in making the program accessible to healthcare providers. Based on the timing of events, data from real-life instances reveal that main resuscitation events, as recommended by the guidelines of the Neonatal Resuscitation Program, are frequently severely delayed. Taking into consideration the fact that the individuals who participated in the NRP practitioner-training course had completed the course within the past four to five years, it was seen that the knowledge points were pretty satisfactory