Performance Evaluation of Reactive Routing Protocols for IEEE 802.11

The progress of communication technology has made wireless devices smaller, less expensive and more powerful. This has initiated everyone to use various wireless network technologies such as 3G, 4G of cellular network, Ad-Hoc, IEEE 802.11 based Wireless Local Area Network (WLAN) and Bluetooth. The performance of the routing protocols AODV, DSR and LAR are compared using Qualnet 5.0.2.Network Simulator with the metrics like average jitter, throughput, end-to-end delay, total number of bytes received and packet delivery ratio successfully routed to their destination

Establishing a Wireless Sensor Network to Monitor the Temperature in a two storied building

The advancement in information technology and the need for large-scale communication infrastructure has triggered the era of Wireless Sensor Networks (WSNs). Sensor network is a collection of sensor nodes connected wirelessly to one another to gather information about the surrounding environment. In this paper a WSN testbed is established using Texas instruments sensor nodes to monitor the temperature in a two storied building

Wireless Sensor Networks: A Performance Study of IEEE 802.15.4 Standard

Wireless Sensor Networks (WSN) play a key role in sensing, computing and communicating the information in most of the fields bringing substantial improvements in a broad spectrum of modern technologies. Data to be routed from source to destination is very difficult in WSN due to the mobility of the network elements and lack of central administration. In this paper an attempt has been made to evaluate the performance of routing protocol Ad-hoc On-demand Distance Vector routing (AODV) for the wireless sensor nodes(IEEE 802.15.4 standard). The performance of routing protocol is analysed using various metrics like total packets received, throughput, average end-to-end delay, total bytes received and average jitter using Qualnet 5.0.2 simulator

A Performance Study of Proactive, Reactive and Hybrid Routing Protocols using Qualnet Simulator

The advancement in information technology and the need for large-scale communication infrastructures has triggered the era of Wireless Sensor Networks (WSNs). Mobile ad-hoc network (MANET) is a network of wireless mobile nodes which communicate with each other without any centralized control or established infrastructure. Routing is the process of selecting paths in a network along which data is to be sent. Routing is a critical task in MANET where the nodes are mobile. Dynamic and reliable routing protocols are required in the ad-hoc wireless networks, as they have no infrastructure (base station) and their network topology changes. There are various protocols for handling the routing problem in the ad-hoc wireless network environment. In this paper focus is given on studying the performance evaluation of various routing protocols using Qualnet simulator 5.0.2. The performance of the proactive, reactive and hybrid protocols are analyzed with different node densities for mobile and stationary nodes. The metrics used for the performance evaluation include average jitter, throughput, packet delivery ratio and average end to end delay

Melioidosis: a case series from coastal Karnataka, India

Melioidosis is an infectious disease caused by gram negative bacteria B. pseudomallei. The disease is largely under diagnosed globally. Sporadic cases have been reported from India, distributed mostly in the coastal areas. Authors present a series of seven culture proven cases of Melioidosis treated at a tertiary care Hospital in the coastal city of Mangalore in South India

Performance Evaluation of Connection Admission Control for IEEE 802.16 Networks

Quality of Service (QoS) provisioning to the various kinds of network traffic is one of the major design criteria of IEEE 802.16 WiMAX standard. The MAC and physical layers of 802.16 standards are designed to support different types of real time application by providing QoS. Scheduling, Connection Admission Control (CAC) and traffic policing are the major issues to ensure QoS. In standard, scheduling and admission control are kept as open issues. Admission control is the ability of a network to control admission of new traffic based on the availability of resources. As per the specification the CAC considers minimum reserved rate of a connection as an admission criterion, in which the system can admit more connections, but packets of admitted connection may encounter large delays. In this paper average data rate (avg-rate CAC) and maximum sustained rate (max-rate CAC) of the connections are considered as admission criteria in CAC, along with minimum reserved rate (min-rate CAC). The performance of the WiMAX network is evaluated and compared for min-rate, avg-rate and max-rate CAC by considering the performance metrics such as number of connections admitted, throughput and delay using QualNet simulation tool

Induction of smectic C phase in binary mixtures of compounds with cyano end groups

We have studied binary mixtures of 4-cyanophenyl-3'-methyl-4'(4"-n-dodecylbenzoyloxy)benzoate (12 CPMBB) and 4-n-dodecylphenyl-3'-methyl-4'(4"-cyanobenzoy1oxy)benzoate (12 PMCBB). The former compound exhibits nematic, smectic A and reentrant nematic phases and the latter one nematic and smectic A phases with a possible AdA2, transition. Over a fairly wide composition range, the mixtures exhibit an induced smectic C phase on cooling the sample from the A phase. The phase diagram, and the temperature variations of the layer spacings for some specific compositions are reported. The possible origin of the C phase is also discussed

Simulation Study on Improved AODV Routing protocol

Mobile Ad-hoc Network (MANET) is a network of wireless mobile nodes which communicate with each other without any centralized control or established infrastructure. Routing is a critical task in MANET where the nodes are mobile. In this paper an attempt has been made to evaluate the performance of prominent routing protocol of MANET: Ad-hoc On-Demand Distance Vector Routing (AODV) and Improved Ad-hoc On-Demand Distance Vector Routing (I-AODV) protocol. The performance differentials are analysed using various metrics like throughput, average end-to-end delay, total bytes received and average jitter

Study to assess the patterns of hypertension and factors influencing hypertension in chronic kidney disease

Background: A large proportion of CKD patients have inadequate BP control, and the proportions vary from studies to studies. Clinic BP is considered insufficient to diagnose HTN and monitor overall BP control because it does not correlate well with ambulatory blood pressure monitoring (ABPM), which encompasses white-coat or masked HTN. CKD is associated not only with an abnormal dipping pattern but also with white-coat or masked HTN. Objective of this study was to evaluate the factors influencing the blood pressure in chronic kidney disease patients. Methods: A cross sectional study was conducted at a tertiary hospital in South India from 1st of January 2016 to 31st of July 2017. A total of 124 cases were included in the study. Results: Among subjects with controlled HTN, 31.4% were overweight and 5.7% were Obese. Among Stage 3 CKD subjects, 53.7% had controlled HTN, 12.2% had masked HTN, 12.2% had persistent HTN. We reported that among those with proteinuria 2+, 38.5% had controlled HTN, 11.5% had masked HTN, 19.2% had persistent HTN and 30.8% had white coat HTN. In the study among diabetics, 17.5% had controlled HTN, 36.8% had masked HTN, 43.9% had persistent HTN and 1.8% had white coat HTN. Conclusions: Stage of CKD, diabetes mellitus and proteinuria are determinants of hypertension in CKD patients. ABPM is the best method to monitor BP and hence in the proper management of HTN and in prevention of target organ damage in CKD patients