ZigBee standard is the popular communication protocol for wireless sensor networks (WSN) and Internet of Things (IoT) networks. An energy efficient WSN technology is a good choice for an IoT based lighting control technology. This article is a comparative analysis for finding the quality of service parameters provided by the different topologies of ZigBee for a wireless networked lighting control system. In order to estimate the energy consumption in ZigBee topologies for lighting automation, this work analyses the star, mesh, and tree topology-based WSN with two routing protocols Adhoc on-demand distance vector (AODV) and dynamic source routing (DSR). Lighting automation using wireless control networks with sensor-actuator nodes in a laboratory is considered as the test scenario. The applicability of ZigBee topologies for IoT-based lighting automation is discussed by the evaluation of performance parameters like average jitter, throughput, end-to-end delay, and energy model.

Background: The lighting researchers are keenly looking for the huge benefits of the internet of things on an open platform which provides the cost gains in addition to other environmental benefits. Connected systems interact with the software and analyse real-time building conditions, and feed information into the building controls network. Methods: This paper presents a wireless networked system for lighting control in buildings which connect the power of the Internet of Things. After analysing the ZigBee network on QualNet v7.4, a Digi Mesh network was set up using XBee modules using the XBee Configuration and Test Utility [XCTU] Software v6.3.11. The ThingSpeak cloud platform along with MATLAB 2017b provides the necessary cloud support to enable this network to communicate over the internet. The results indicate that the XBee S2C module functioning in the API mode when flashed with the DigiMesh firmware offers the best option for forming a self-healing mesh network. An aggregator node acts as an information sink and collects the sensor data from all the sensor nodes and passes it on to the cloud via the Raspberry gateway. Results: The algorithm on the cloud can read this sensor data and compute the necessary Pulse Width Modulation [PWM] signals required to control the brightness of a dimmable LED luminaire. The system also takes into consideration the zone-wise occupancy in the room while computing the PWM values to be sent to the luminaires. Conclusion: The use of the concept of open platform sensors and actuators is the significance of the work.

During routine dissection, an Iliofemoral arterial malformation was noticed in a 65 year old male cadaver. The abdominal aorta was considerably laterally displaced and also bifurcated higher up. The common iliac artery divided one vertebral level higher and the femoral artery gave the profunda femoris artery about 1.2 cm below the inguinal ligament, which is considerably proximal to its usual level of origin. A brief review of literature and embryological basis of the anomalies are discussed. Descriptors: Arteries, abnormalities. Abdominal aorta. Iliac artery. Femoral artery. Resumo Durante uma dissecção de rotina realizada em um cadáver do sexo masculino com 65 anos de idade foi constatada malformação arterial iliofemoral. A aorta abdominal estava consideravelmente deslocada lateralmente e também bifurcava em nível mais alto. A artéria ilíaca comum dividia-se uma vértebra acima do nível normal e a artéria femoral dava origem à artéria femoral profunda aproximadamente l,2 cm abaixo do ligamento inguinal, o que é consideravelmente proximal ao seu nível normal. Aqui nós apresentamos uma breve revisão de literatura e base embriológica dessas anomalias. Descritores: Artérias, anormalidades. Aorta abdominal. Artéria ilíaca. Artéria femoral.

The main aim of this paper is to develop a low cost system which keeps the room temperature at a desired temperature throughout without any human intervention irrespective of any changes in the external environment. The heating system is switched on if the surrounding temperature is less than the desired temperature or the cooling system is switched as the temperature sensed by the sensor goes above the surrounding temperature. Nevertheless, these kind of systems still needs some kind of improvement for being a better alternative.

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