Guaranteeing synchronous message deadlines with the timed token medium access control protocol

We study the problem of guaranteeing synchronous message deadlines in token ring networks where the timed token medium access control protocol is employed. Synchronous capacity, defined as the maximum time for which a node can transmit its synchronous messages every time it receives the token, is a key parameter in the control of synchronous message transmission. To ensure the transmission of synchronous messages before their deadlines, synchronous capacities must be properly allocated to individual nodes. We address the issue of appropriate allocation of the synchronous capacities. Several synchronous capacity allocation schemes are analyzed in terms of their ability to satisfy deadline constraints of synchronous messages. We show that an inappropriate allocation of the synchronous capacities could cause message deadlines to be missed even if the synchronous traffic is extremely low. We propose a scheme called the normalized proportional allocation scheme which can guarantee the synchronous message deadlines for synchronous traffic of up to 33 percent of available utilization. To date, no other synchronous capacity allocation scheme has been reported to achieve such substantial performance. Another major contribution of this paper is an extension to the previous work on the bounded token rotation time. We prove that the time elapsed between any consecutive visits to a particular node is bounded by upsilon TTRT, where TTRT is the target token rotation time set up at system initialization time. The previous result by Johnson and Sevcik is a special case where upsilon = 2. We use this result in the analysis of various synchronous allocation schemes. It can also be applied in other similar studies

Architectural impact of FDDI network on scheduling hard real-time traffic

The architectural impact on guaranteeing synchronous message deadlines in FDDI (Fiber Distributed Data Interface) token ring networks is examined. The FDDI network does not have facility to support (global) priority arbitration which is a useful facility for scheduling hard real time activities. As a result, it was found that the worst case utilization of synchronous traffic in an FDDI network can be far less than that in a centralized single processor system. Nevertheless, it is proposed and analyzed that a scheduling method can guarantee deadlines of synchronous messages having traffic utilization up to 33 pct., the highest to date

DEVELOPMENT AND VALIDATION OF REVERSED PHASE HPLC-PDA METHOD FOR THE QUANTIFICATION OF CHRYSIN IN SOLID LIPID NANOPARTICLES

Objective: The main aim of the present study was to develop and validate a simple, precise and accurate Reversed-Phase HPLC-PDA method for the quantitative determination of Chrysin in solid lipid nanoparticles (SLNs). Methods: The RP-HPLC-PDA system equipped with a C-18 reversed-phase column (250 × 4.6 mm, particle size 5 μm) was employed in the present study. HPLC grade methanol and water in 85:15 (v/v) ratio was selected as the mobile phase at flow rate of 1 ml/min under an ambient column oven temperature. The detection wavelength was kept at 268 nm. Validation of developed method was performed according to the ICH guidelines. Results: The developed reversed-phase HPLC-PDA method was found to be linear in the concentration range of 0.2-10 µg/ml with a correlation coefficient of 0.999. The method was also observed to be precise with % relative standard deviation (RSD) below 2%. The limit of detection and limit of quantification of this method were found to be 0.05µg/ml and 0.14µg/ml, respectively. The percent recovery of the developed method was estimated to more than 99%. Conclusion: The developed HPLC method can be utilized for the determination of Chrysin with a high degree of accuracy, precision, robustness, specificity in solid lipid nanoparticles in the presence of excipients

Performance Analysis of Induction Motor Using PI And FUZZY Controller

This paper represents the better speed regulation of induction motor by the help of indirect vector control technique and also by using other controlling techniques. Here speed of induction motor is regulated or controlled by using PI controller and fuzzy logic controller, by using PI controller it provides good regulation of speed but due to some drawback in it like high overshoot, oscillation of speed and torque at variation or change in load or due to external disturbances occur during running performance of induction motor drive that controller is replaced by fuzzy logic controller which provides more better running performance to the induction motor by regulating its speed in better way and tracking the actual running speed response easily and fast as compare to PI controller. The benefits of squirrel-cage induction motors are high robustness and low maintenance which make it widely used through various industrial modem processes, with growing economical and demands. In conventional FOC, PI controller is used to control the speed response of the induction motor drive. The use of PI controller induces many problems due to sudden changes in load and external disturbances. This behavior of the controller causes disturbance in drive running performance. To overcome this disadvantages an intelligent controller based on fuzzy logic is employed in the place of the conventional PI controller. DOI: 10.17762/ijritcc2321-8169.15061

Linezolid susceptibility in MRSA isolates: insights into resistance and concordance in phenotypic detection methods

Background: Methicillin-resistant staphylococcus aureus (MRSA) poses persistent threat, affecting both healthcare environment and communities, with substantial impact on infection rates, morbidity, mortality, and healthcare costs. Vancomycin, a longstanding cornerstone in MRSA treatment, but with the emergence of vancomycin resistant MRSA (VRSA), necessitating alternative antimicrobial solutions. Linezolid, stands out as a promising candidate. It has unique advantages such as an absence of renal toxicity and improved lung parenchymal diffusion compared to vancomycin, making it an appealing choice, especially for healthcare-acquired pneumonia by MRSA. Methods: This cross-sectional study investigated linezolid susceptibility in 158 MRSA isolates using both disk diffusion and agar dilution method. Results: Results indicated that the majority of isolates exhibited linezolid susceptibility, with 53.16% showing a minimum inhibitory concentration (MIC) of ≤2 µg/ml. However, two MRSA isolates, constituting 1.27% of the sample, displayed a MIC of 8 µg/ml, named them as a linezolid-resistant MRSA (LRSA). These findings align with previous research, mirroring resistance rates observed in different regions. Notably, vigilance against linezolid resistance is crucial, particularly due to its status as a last-resort MRSA treatment. Conclusions: Remarkably, a 100% concordance was found between the disk diffusion and MIC methods for detecting linezolid resistance in MRSA, suggesting that the disk diffusion method may be practical choice for laboratories with heavy workloads. However, adherence to CLSI guidelines is essential, and cases of resistance by disk diffusion should be confirmed using MIC methods. Emergence of linezolid-resistant MRSA is a worrisome development, necessitating ongoing surveillance and vigilance

Performance Analysis of Induction Motor For Sudden Load Disturbance Using PI And FUZZY Controller

This paper presents the improved performance in speed of an induction motor by applying vector control techniques which transforms the induction motor from nonlinear to linear plant system and fuzzy control system provides the better running performance of the induction motor at various disturbances in load by tracking the waves to reach the steady state response earlier than PI controller. The benefits of squirrel-cage induction motors are high robustness and low maintenance which make it widely used through various industrial modem processes, with growing economical and demands. In conventional FOC, PI controller is used to control the speed response of the induction motor drive. The use of PI controller induces many problems like high overshoot, oscillation of speed and torque due to sudden changes in load and external disturbances. This behavior of the controller causes deterioration of drive performance. To overcome this disadvantages an intelligent controller based on fuzzy logic is employed in the place of the conventional PI controller. DOI: 10.17762/ijritcc2321-8169.15061

Thoracic epidural for modified radical mastectomy in an asthmatic patient

Thoracic epidural anaesthesia is one of the safe and good alternative to general anaesthesia in high risk patients of chronic obstructive pulmonary disease and asthma where general anaesthesia is contraindicated. A 55 years old female patient was scheduled for modified radical mastectomy on account of advanced carcinoma of right breast. The patient was known case of bronchial asthma since 5 years with frequent attacks per week for which she was taking nebulisation with salbutamol and budesonide two times per day. In the pre-operative evaluation, her vitals were within normal limit but on auscultation air entry was reduced all over the chest with bilateral crepts and rhochi present. We did this patient in plaine thoracic epidural anaesthesia without haemodynamic instability. Thoracic epidural anaesthesia and analgesia for mastectomy is feasible, and it offers additional benefits in high-risk patients

Recent trends in seroprevalence of syphilis in different patient groups attending a regional centre for sexually transmitted infections in central India

Background: Easy access to Suraksha clinics for sexually transmitted infections calls for a review of seroprevalence of syphilis. Methods: Serum samples from attendees of sexually transmitted infections (STI)/ reproductive tract infections (RTI) clinic/antenatal clinic, and samples of high-risk group (HRG: female sex workers and men having sex with men) brought by non-government organizations from 2017-22 were screened for syphilis by Venereal Disease Research Laboratory (VDRL) and Treponema pallidum hemagglutination (TPHA) tests. Samples positive by both tests were considered seropositive for syphilis. Statistical methods used for analysis were chi square test for linear trends and Kruskal Wallis test. Results: In STI clinic percentage positivity for syphilis has shown a statistically significant decline from 2017-22. In RTI clinic the decline was significant from 2017-19 but not significant in the years 2019-22. In antenatal clinic and in HRGs the change in seroprevalence was not significant from 2017-22 and 2017-20 respectively. However, the HRGs showed a significantly increasing trend in syphilis seropositivity from 2020-22. Conclusions: There is a significantly declining trend in the seroprevalence of syphilis in patients attending the STI/RTI clinic from 2017-22 and in HRGs from 2017-20. However, a significant increase in trend in HRG from 2020-22 may have been due to behavioural changes during the lockdown for covid 19 pandemic. A significant decline in syphilis in patients attending the STI and RTI clinic and in HRGs attending the regional centre indicates the effectiveness of consistent detection, treatment and counselling efforts of the national control program on STI in the region

Massive spontaneous corpus callosal hemorrhage with intraventricular extension

Spontaneous hemorrhage into the corpus callosum with intraventricular extension is uncommon. In the present article we describe a case 60 year female who had massive hemorrhage along the corpus callosum involving genu, body of corpus callosum and extending on ventral as well as dorsal aspect of the corpus callosum with intraventricular extension and areas of hypodensities in the body of the corpus callosum and adjacent cerebral cortex. In this case the subarachnoid and corpus callosal hemorrhage probably resulted from the ruptured aneurysms of the anterior cerebral artery