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The concept of underwater docking stations has long been proposed to support the long term deployment of AUVs, but the number of successful solutions is still very disappointing. Hovering type AUVs can navigate arbitrarily slow, simplifying the docking maneuver and the requirements for the receiving structure. This paper describes a docking system that was developed to extend the mission duration...
As India tries to add significant renewables to its coal-dominated energy mix, the problem of intermittent generation associated with renewables, is likely to be a problem. Even though battery prices have been falling rapidly, any serious grid-level storage will push up the price of electricity beyond the affordability limit for a large section of Indian people. The answer is in developing techniques,...
The proposed work aims at designing routing method and data compression algorithm for WSN's. An ad-hoc network (WANET) is considered and based on certain criteria the data is forwarded dynamically. Various parameters such as Compression Ratio, Packet Delivery Rate, Energy consumption are considered to determine the efficiency of the network. One of the primary parameters to be considered in the configuration...
Healthcare services and research centre reports estimate that by 2050, Americans aged 65 or older will reach the 89 million mark, this is more than double the number of older adults in the United States in 2010. In an aging society, it is important to home care elderly and maintain their daily needs and provide safe evacuation alternatives in the case emergency. Hence, this paper aims to implement...
Land mapping and surveying is an important part of all civil works. An important part of land surveying is Digital Elevation Models which are also critical inputs for flood prediction, landslide models etc. Currently, most of land mapping for construction purposes is done using terrestrial methods. In this paper we develop a method to attain similar results in a simpler, rapid and cost effective manner...
In a DC micro grid, storage units are used to balance the load-generation mismatch. Battery is used as a primary unit of storage, but it cannot meet the transient demands of the load which can cause DC bus voltage fluctuations. For this reason, an ultra-capacitor is used along with the battery to meet the transient demand of the grid. The controller used to regulate the power converter to feed power...
Wireless sensor networks (WSNs) consist of nodes with limited power resources. A potential method to prolong the lifespan of a node is the use of an antenna which can harvest energy from radio frequency (RF) signals. In this paper, we model a network consisting of nodes with energy harvesting capabilities and a number of dedicated energy transmitters (ETs) which send data to the nodes. We identify...
Doze mode, which was introduced from Android 6.0 aiming at reducing battery consumption when the device is unused for a long time. This work firstly reveals the internal details of the battery-saving feature, especially about the state transitions. Furthermore, we discover several defects in Android's device drivers associated with doze mode. By exploiting the defects, we implement various proof-of-concept...
In this paper, we study the optimum sensing of a time-varying random event with a sensor powered by energy harvesting devices. The system aims at reconstructing a band-unlimited continuous-time random process by using discrete-time samples collected by a sensor. Due to the random nature of the harvested energy, the sensor might not have sufficient energy to perform a sensing operation at a desired...
In cognitive radio (CR), the spectrum sensing of the primary user (PU) may consume some electrical power from the battery capacity of the secondary user (SU), yielding to decrease the transmission power of the SU. In this paper, a multislot simultaneous spectrum sensing and energy harvesting model is proposed, which uses the harvested radio frequency (RF) energy of the PU signal to supply the spectrum...
Urban IoT data collection is challenging due to the limitations of the fixed sensing infrastructures. Instead of transmitting data directly through expensive cellular networks, citizen-centric data collection scheme through opportunistic network takes advantage of human mobility as well as cheap WiFi and D2D communication. In this paper, we present OppNet, which implements a context aware data forwarding...
Performance of Cognitive Radio (CR) is affected by the estimation of availability of vacant channels based on traffic distribution observation of licensed users. Telecom traffic prediction at a particular instant depends on thorough knowledge of day of the week, hour of the day and instant of the hour. Distributed cooperative spectrum sensing is infrastructure based in which the sensor nodes themselves...
This paper presents a micro-power photovoltaic (PV) harvesting system. A H-bridge configuration DC-DC converter is designed to harvest PV energy and deliver energy to applications of Internet of Thing (IOT). The main converter consists of a single inductor with two inputs and two outputs. It regulates a constant 1V output voltage for several applications such as sensors and signal transmitters. The...
In energy-constrain wireless sensor networks, maintaining k — coverage degree requested by an application while maximizing the network lifetime is a major challenge. Existing literature on k — coverage does not consider residual energy levels and actual battery discharge rate of ACTIVE nodes. OBSP (Optimized Backoff Sleep Protocol) considers the residual energy level information and battery discharge...
The wide spread of smart mobile devices such as tablets and phones makes mobile crowdsensing a viable approach for collecting data and monitoring phenomena of common interest. Smart devices can sense and compute their surroundings and contribute to mechanisms that examine social and collective behaviours. Crowdsensing offers a feasible alternative to exchange and compute sensing tasks and data between...
A current challenge for AUV missions is to combine long endurance with high manoeuvrability. The proposed Pipefish AUV is a long endurance AUV capable of high quality survey missions that can deliver multiple hover capable AUVs to sites of interest. The Pipefish AUV and the small vehicles can perform cooperative tasks and reach remote locations without the need for a monitoring surface vessel. It...
SenseMyCity is an opportunistic mobile crowdsensing tool available for researchers to design and implement data collection campaigns for studying large-scale processes. We discuss how our tool addresses two critical aspects of large scale data gathering campaigns: compliance with data protection guidelines and low intrusiveness. The latter is achieved by low battery consumption and low interaction...
In this paper, we propose a system for ‘Real Time Monitoring of Power Resources with Surveillance based on M2M Communication’ which is capable to monitor the status of different power sources (grid power, DG power, back up battery Voltage) at any remote site along with surveillance of that site. This system will send the recorded data to a centralized server via secured channel for future analysis...
The objectives of this project were to design, develop, install, and test a stand-alone and unmanned network of effective, reconfigurable, low-power, low-cost, long distance by multi-hop, and sustainable CBFEWS. This system aims to monitor and detect through sensors, and communicate early warning data by wireless telemetry to disaster risk-reduction centers. This gives risk-reduction managers of local...
Coverage and connectivity are the two important factors so far the energy efficient performance in wireless sensor networks is concerned. Although, wireless sensor network is one of the upcoming technologies in the field of wireless communication, we find very less development of real time applications using the sensor networks. The main reason for this is the design of the motes to be deployed in...
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