MODEL KONTROLE PRISTUPA USLUGAMA U OBLAKU NA OSNOVU RAZLIČITIH ULOGA KORISNIKA

The rapid development of computer technology, cloud-based services have become a hot topic. They not only provide users with convenience, but also bring many security issues, such as data sharing and privacy issue. In this paper, we present an access control system with privilege separation based on privacy protection (PS-ACS). In the PS-ACS scheme, we divide users into private domain (PRD) and public domain (PUD) logically. In PRD, to achieve read access permission and write access permission, we adopt the Key-Aggregate Encryption (KAE) and the Improved Attribute-based Signature (IABS) respectively. In PUD, we construct new multi-authority cipher text policy attribute-based encryption (CP-ABE) scheme with efficient decryption to avoid the issues of single point of failure and complicated key distribution, and design an efficient attribute revocation method for it. The analysis and simulation result shows that our scheme is feasible and superior to protect users’ privacy in cloud-based services.Nagli razvoj računalne tehnologije, usluge temeljene na oblaku, postale su aktualna tema. Oni ne samo da korisnicima pružaju praktičnost, nego i donose mnoga sigurnosna pitanja, kao što je dijeljenje podataka i problem privatnosti. U ovom radu predstavljamo sustav kontrole pristupa s razdvajanjem povlastica na temelju zaštite privatnosti (PS-ACS). U PS-ACS shemi, podijelimo korisnike na privatnu domenu (PRD) i javnu domenu (PUD) logično. U PRD-u, da bi se postiglo dopuštenje pristupa za čitanje i dopuštenje za pisanje, usvajamo ključno šifriranje (KAE) i poboljšani potpis na temelju atributa (IABS). U PUD-u konstruiramo novu shemu šifriranja (CP-ABE) koja se temelji na pravilima šifriranog teksta s učinkovitim dešifriranjem kako bismo izbjegli probleme s jednom točkom neuspjeha i komplicirane distribucije ključeva i dizajnirali učinkovitu metodu opoziva atributa za nju. Rezultati analize i simulacije pokazuju da je naša shema izvediva i superiorna za zaštitu privatnosti korisnika u uslugama temeljenim na oblaku

Role of Effectiveness of Autologous Platelet Rich Plasma in Healing of Chronic Ulcer

INTRODUCTION: Chronic ulcers are a major health problem worldwide and have great impact at personal, professional and social levels, with high cost in terms of human and material resources. Application of autologous Platelet Rich Plasma (PRP) has been a major breakthrough for the treatment of non-healing and diabetic foot ulcers, as it is an easy and cost-effective method, and provides the necessary growth factors that enhance tissue healing. AIM AND OBJECTIVE: To study the role of effectiveness of autologous platelet rich plasma in healing of chronic ulcers. To study the percentage of reduction of area of the ulcer every week for 4 weeks. METHODS: Patients admitted in surgery ward for chronic ulcer between age group 18-85 during December 2017 to June 2019 were studied. Individuals with systemic disease or history of anticoagulant, immunosuppressive, pregnant women, patients with severe cardiovascular disorder, bleeding disorder and anemia were excluded. Detailed history, clinical examination and lab investigations were taken and analyzed. Autologous platelet rich plasma was prepared from the patients and was applied to the ulcer and regular dressings were done. Wound area was calculated every week for 4 weeks. The treatment outcome was defined as a percentage change of the area, which was calculated as initial measurement minus assessment day measurement divided by initial measurement. CONCLUSION: 51 cases were studied. Various factors like age group, gender, etiology of the ulcer, percentage change of area of the ulcer is calculated and found that autologous platelet rich plasma is effective in healing of chronic ulcers. The mean percentage area of reduction of ulcer in the study is 73.0124% in 4 weeks, which is a very significant reduction in the area of the ulcer

An investigation on image denoising technique using pixel-component-analysis

This paper authenticates a proficient image denoising scheme with the analysis local pixel coherence. In the dominion of a study about noise and pixel elements in image processing, the influence of the Gaussian effect on image contrast plays a key role. It is found in particular that pixel variations may be vast in some cases which potentially tend to develop irregularities in the image

A pattern recognition approach for identification of transducer-structure debonding using Lamb waves

In structural health monitoring, using piezoelectric transducers to generate high frequency elastic waves like Lamb waves in the structures is eminent. In general, piezoelectric transducers are assumed to be perfectly bonded with the host structure; however, in practical environment, there are possibilities for them to have faults. Since detecting, locating and assessing damages in a structure depend solely on transducer responses, transducer fault identification is vital. By using electrical admittance, axial strain and shear stress as function of frequencies or in analog interface circuits to identify faulty transducers, lead to demand of circuitry and processes, consequently increasing the implementation complexity. Hence, we propose a pattern recognition system that can identify transducers that are partially bonded to host structure. This pattern recognition system employs classification for features extracted from instantaneous Lamb wave signals with no need of baseline data

Comparative study of tramadol and piroxicam as analgesic for postoperative pain in patients operated for inguinal hernia and hydrocele

Background: Pain is usually protective, it warns of tissue damage and prompts treatment but postoperatively, it can delay recovery. Postoperative pain is both distressing and detrimental for the patient. Postoperative pain may be a significant reason for delayed discharge from hospital, increased morbidity and reduced patient satisfaction.Methods: This was a hospital based prospective, randomized, comparative, observational study conducted over a period of one year. Patients operated for hydrocele and inguinal hernia were included in the study after applying the inclusion and exclusion criteria. For the purpose of study, equal numbers of subjects were randomly allocated one of the two analgesic protocols. Pain assessment was done by using visual analog scale (VAS) for the first 72 hours of the postoperative period.Results: When the drugs were compared individually, piroxicam was superior to tramadol in first 24, 48 and 72 hours of postoperative period in case of pain after surgery for hernia. Piroxicam was found to be superior to tramadol in first postoperative 24 hours after surgery for hydrocele with no significant difference first 48 & 72 hours of postoperative period. Piroxicam has the advantage of requiring lesser frequency of administration than tramadol due to prolonged duration of action.Conclusions: Piroxicam provides better and effective analgesia in acute post-operative pain along with the advantage of requiring lesser frequency of administration than tramadol

Sarcomatoid Carcinoma Metastasis to the Colon from a Small Renal Mass: Case Report with Review of Literature

A third of patients with renal cell carcinoma (RCC) present with metastatic disease. Metastasis in RCC from small renal mass (SRM) (≤4 cm) is rare. We report a case of stage cT1a clear-cell RCC with low-risk features on pathology presenting with disproportionately large synchronous solitary metastasis to the transverse colon. He underwent resection of the mass with the involved transverse colon and adjoining mesocolon. Intestinal continuity was restored, following which partial nephrectomy was performed for the right renal tumor. Final pathology of the right renal mass confirmed clear-cell RCC. The large mass after immunohistochemistry profile confirmed metastasis from the renal tumor

Management of Laryngotracheal Trauma: A Five-Year Single Institution Experience

Introduction: Laryngotracheal trauma is a rare life-threatening emergency that requires early identification and immediate intervention. Here, we present 26 patients with laryngotracheal trauma from a tertiary hospital in India. The aim was to describe the clinical presentation and management of laryngotracheal trauma patients.   Materials and Methods: This was a retrospective study of laryngotracheal trauma patients treated between January 2011 and March 2016. Patients who presented with a breach in the laryngotracheal framework were included, while those who had penetrating neck injuries superficial to strap muscles/platysma, burn injuries, caustic ingestion, or endotracheal injuries were excluded from the study.   Results: Of 253 patients with neck injury, 26 (23 adults, three children; 21 males, five females; age range, 5-60 years) presented with a breach in the laryngotracheal framework (15 blunt neck-trauma patients and 11 penetrating neck-trauma patients). The most common cause of neck injury was road traffic accidents, seen in 12 patients (46.2%). Computed tomography (CT) was performed in all blunt trauma cases and in four patients with penetrating trauma. All penetrating trauma patients underwent neck exploration. Twelve blunt trauma patients (46.1%) were managed conservatively, while three (11.5%) required surgical intervention. The most common neck exploration finding noted in patients with a penetrating injury was fracture of the thyroid cartilage, which was seen in eight patients (30.8%). Twenty patients (76.9%) had a normal voice, five patients (19.2%) had a hoarse voice, and one patient (3.8%) had a breathy voice post treatment.   Conclusion: Early intervention of laryngotracheal trauma is crucial. The role of a CT scan is essential in decision making in blunt trauma cases

Humoral response to viral vector COVID-19 vaccine in hemodialysis patients

Background The coronavirus disease 2019 (COVID-19) vaccine is not readily available in many countries where dosing interval is spaced more than ideal. Patients with chronic kidney disease, especially those on maintenance hemodialysis, have a tendency for a reduced immune response. This study was undertaken to demonstrate the distinct humoral immune response to the viral vector COVID-19 vaccine in patients with kidney failure receiving maintenance hemodialysis. Methods The study was carried out with two cohorts: 1) patients receiving maintenance hemodialysis and 2) healthcare workers from the same dialysis center as controls, each group with 72 subjects. Participants received a dose of Covishield ChAdOx1 nCoV-19 coronavirus vaccine. The humoral immunological response was determined using electrochemiluminescence immunoassay which quantitatively measures antibodies to the severe acute respiratory syndrome coronavirus 2 spike protein receptor-binding domain. Results All study subjects in the control group developed a humoral response (antibody titer of ≥0.8 U/mL), while only 64 of 72 in the dialysis group (88.9%) were responders. Age (ρ = –0.234, p = 0.04) and sodium level (ρ = 0.237, p = 0.04) correlated with low antibody titer in bivariate analysis. In multivariate analysis, only age (odds ratio, 1.10; 95% confidence interval, 1.01–1.22; p = 0.045)was associated with nonresponders. Conclusion Our study demonstrated a weak antibody response of hemodialysis patients to the viral vector COVID-19 vaccine. Older age was associated with nonresponders. Evaluation of both humoral and cellular immunity after the second vaccine dose and serial antibody titers can help determine the need for booster shots

Productivity collapses in the Arabian Sea during glacial cold phases

Productivity in the Arabian Sea is one of the highest in the world. It is controlled by seasonally reversing monsoonal wind-driven upwelling of nutrient-rich deeper waters which fuel phytoplankton growth. The detailed history of upwelling-induced productivity in the eastern Arabian Sea is unknown. Here we present paleoproductivity records from a composite sediment core at the millennial scale during the last 80 kyr B. P. These records are based on relative abundance counts of planktonic foraminifera and organic carbon contents, which are shown to mainly vary in concert. The eastern Arabian Sea upwelling-induced productivity was higher in the glacial period than in the Holocene, but it fell repeatedly on millennial timescales. These productivity declines occurred during cold events in the North Atlantic region, with the most pronounced changes prevailing during the Heinrich events. Hence, seasonal monsoon winds that drive upwelling-induced productivity in the east were weak when the North Atlantic was cold. These weak winds resulted in stratification of the water column, comparable to today's Arabian Sea stratification in the intermonsoonal period. Combining the new eastern with published western Arabian Sea results shows that the entire biological factory was severely diminished during the North Atlantic Heinrich events, and the seasonal productivity change in the Arabian Sea monsoon system was reduced with year-round low productivity