Performance evaluation of WLAN for mutual interaction between unicast and multicast communication sessions

In this Thesis, performance evaluation of wireless local area networks (WLANs) is conducted to understand the effects of mutual interaction between real-time unicast and multicast communication sessions. The analysis extends the performance evaluation of WLAN from the isolated study of unicast or multicast sessions to their mutual interaction. The nature of multicast session is VoIP, whereas the unicast sessions are VoIP and a single video flow. The performance of unicast and multicast sessions is investigated by simulations for experienced quality of service. The reliability concerns of simulator performance are addressed by verifying the simulator against an experimental setup. It takes into account the Medium Access Control (MAC) and Physical (PHY) layer parameters and the probability of collision for increasing number of sessions. The analysis environment is a single WLAN cell where the sessions are mobile. The mobility of the sessions is mapped with a proposed group mobility model whose statistical properties are studied via simulations. The performance results obtained with the sessions' mobility are compared with those of static sessions and sessions moving according to the Random Waypoint (RWP) mobility model

Evaluation and comparison: antipyretic activity in compound products of herbal pharmaceutical industries

To reduce an elevated body temperature various antipyretics drugs and medicinal plants are used. This study was designed to evaluate the antipyretic claim compound herbal syrups manufactured by three different herbal pharmaceutical companies of Pakistan. Bukharin (Hamdard Laboratories), Fever-X (Qarshi Industries) and Bukharok (Ashraf Laboratories) products were tested in rabbits. The experimental conditions were produced by E. coli suspension in animal model whereas 150 mg/Kg Paracetamol suspension was used as positive control. Doses with concentration of 5 ml/Kg of syrup were administered to check temperature lowering effect. The administration of Bukharin, Fever-X and Bukhrok significantly reduced the rectal temperature of animals. It was concluded that Bukharok and Bukharin syrups are good antipyretic drug products as they lowered 3 and 2.5 ?C temperature respectively. Keywords: Antipyretic effect, Herbal Syrups, Comparison with Allopathic Medicin

The Effect of Service Quality on Purchase Intention with Mediating Role of Store Image

This study emphasizes to measure the effect of service quality on purchase intention with mediating role of store image. The study majorly focused on paint brands available at stores of Manama, Bahrain. Reliability of data, descriptive analysis and Pearson correlation matrix was calculated by using SPSS. The relationship among study variables is tested trough structural equation modeling (SEM) by using AMOS 24. Results highlighted that there is significant and positive relation between service quality and purchase intention of private label paint brands. Moreover, it was found that store image mediates the relationship between service quality and purchase intention of private label paint brands

Indoor Positioning Trends in 5G-Advanced: Challenges and Solution towards Centimeter-level Accuracy

After robust connectivity, precise positioning is evolving into an innovative component of 5G service offerings for industrial use-cases and verticals with challenging indoor radio environments. In this direction, the 3GPP Rel-16 standard has been a tipping point in specifying critical innovations, followed by enhancements in Rel-17+. In this article, we follow this path to elaborate on the 5G positioning framework, measurements, and methods before shifting the focus to carrier-phase (CP) measurements as a complementary measure for time- and angular-based positioning methods toward achieving centimeter-level accuracy. As this path is not without challenges, we discuss these and outline potential solutions. As an example of solutions, we study how phase-continuous reference signaling can counter noisy phase measurements using realistic simulations in an indoor factory (InF) scenario.Comment: 5 figures, 1 table, under review for possible publication in IEEE Communications Magazin

Channel ranking based on packet delivery ratio estimation in wireless sensor networks

Wireless sensor networks (WSNs) operating in 2.4 GHz unlicensed bands must explore favorable channels in order to mitigate the effects of induced interference by co-existing wireless systems and frequency selective fading. In this context, we develop a packet delivery ratio (PDR) estimation method for channel ranking in WSNs. The PDR, in general, is defined as a function of signal-to-noise ratio (SNR) and signal-to-interferenceplus-noise ratio (SINR) at the sensor and the packet collision-time distribution of the sensor link. The collision-time distribution depends on the packet size and packet inter-arrival time distributions of both networks. Under limited channel measurements, the collision-time cannot be estimated satisfactorily. In order to bypass the collision-time estimation process, the proposed PDR estimation method utilizes signal level, interference and noise characteristics identified by spectrum measurements adjusted to the intended traffic pattern of the sensor link. The proposed method is validated against the empirical PDR using off-the-shelf sensor platform in emulated multi path wireless fading channels. The results reveal that the method is accurate in modeling the empirical PDR with limited channel energy measurements. In addition, we used the estimated PDR as a metric for channel ranking and verified its effectiveness by ranking the available channels to a WSN under interference from multiple WLANs in a real environment.Peer reviewe

Validation of bioelectrical impedance analysis for assessing dry weight of dialysis patients in Pakistan

Accurate dry weight estimation (DW) to achieve euvolemia is one of the key objectives of hemodialysis (HD). While conventionally DW is estimated by clinical examination, bioelectrical impedance analysis (BIA) has been proposed as an objective method to determine DW and has been tested extensively in the Western population. We aim to validate BIA for determining DW in a Pakistani population against the conventional clinician\u27s method. This is a single-center validation study conducted at two outpatient HD units of Aga Khan Hospital, Karachi. One hundred and forty-eight DW readings of patients who were on maintenance HD were taken both by BIA technology and by clinical assessment. The clinician was blinded to readings obtained by BIA. Data analysis was carried out using the Statistical Package for Social Sciences (SPSS) version 19. Median age of patients was 63 years (range 12-89). Nearly 54.1% of the samples were female (n = 80). Spearman\u27s correlation between the clinician\u27s estimate and BIA-derived DW showed a correlation coefficient of 0.982, which was statistically significant (