| 1. |
- Jayasuriya, Namal, et al.
(författare)
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Resource-Efficient Detection of Elephant Rumbles
- 2017
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Ingår i: SenSys '17 Proceedings of the 15th ACM Conference on Embedded Network Sensor Systems. - New York, NY, USA : ACM.
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Konferensbidrag (refereegranskat)abstract
- The human-elephant conflict is causing significant damages to the life of human and elephants in Sri Lanka. Minimizing encounters between humans and elephants is hence crucial in alleviating the human-elephant conflict. We have earlier introduced Eloc, a cost-effective localization system that is based on infrasonic emissions from wild elephants. One of the remaining challenges is a resource-efficient method to detect the elephants' infrasonic emissions. We present our efforts on devising a support vector machine (SVM) that is able to detect elephant rumbles on Eloc nodes.
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| 2. |
- Boano, Carlo Alberto, et al.
(författare)
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Hot Packets : A systematic evaluation of the effect of temperature on low power wireless transceivers
- 2013
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Ingår i: Proc. 5th Extreme Conference on Communication. - New York : ACM Press. - 9781450321716 ; , s. 7-12
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Konferensbidrag (refereegranskat)abstract
- Temperature is known to have a significant effect on the performance of radio transceivers: the higher the temperature, the lower the quality of links. Analysing this effect is particularly important in sensor networks because several applications are exposed to harsh environmental conditions. Daily or hourly changes in temperature can dramatically reduce the throughput, increase the delay, or even lead to network partitions. A few studies have quantified the impact of temperature on low-power wireless links, but only for a limited temperature range and on a single radio transceiver. Building on top of these preliminary observations, we design a low-cost experimental infrastructure to vary the onboard temperature of sensor nodes in a repeatable fashion, and we study systematically the impact of temperature on various sensornet platforms. We show that temperature affects transmitting and receiving nodes differently, and that all platforms follow a similar trend that can be captured in a simple first-order model. This work represents an initial stepping stone aimed at predicting the performance of a network considering the particular temperature profile of a given environment.
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| 3. |
- Boario, Carlo Alberto, et al.
(författare)
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TempLab : A testbed infrastructure to study the impact of temperature on wireless sensor networks
- 2014
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Ingår i: IPSN 2014 - Proceedings of the 13th International Symposium on Information Processing in Sensor Networks (Part of CPS Week). - : IEEE Computer Society. - 9781479931460 ; , s. 95-106
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Konferensbidrag (refereegranskat)abstract
- Temperature has a strong impact on the operations of all electrical and electronic components. In wireless sensor nodes, temperature variations can lead to loss of synchronization, degradation of the link quality, or early battery depletion, and can therefore affect key network metrics such as throughput, delay, and lifetime. Considering that most outdoor deployments are exposed to strong temperature variations across time and space, a deep understanding of how temperature affects network protocols is fundamental to comprehend flaws in their design and to improve their performance. Existing testbed infrastructures, however, do not allow to systematically study the impact of temperature on wireless sensor networks. In this paper we present TempLab, an extension for wireless sensor network testbeds that allows to control the on-board temperature of sensor nodes and to study the effects of temperature variations on the network performance in a precise and repeatable fashion. TempLab can accurately reproduce traces recorded in outdoor environments with fine granularity, while minimizing the hardware costs and configuration overhead. We use TempLab to analyse the detrimental effects of temperature variations (i) on processing performance, (ii) on a tree routing protocol, and (iii) on CSMA-based MAC protocols, deriving insights that would have not been revealed using existing testbed installations.
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| 4. |
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| 5. |
- Elvitigala, Charitha, et al.
(författare)
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Towards a sensor system to tame the human elephant conflict
- 2015
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Ingår i: Sensors Applications Symposium (SAS). - IEEE. - 9781479961177 ; , s. 169-172
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Konferensbidrag (refereegranskat)abstract
- The human elephant conflict in Sri Lanka has been a cause of major concern over the past decade. Frequent clashes between wild elephants and villagers have resulted in severe damage to property, as well as loss of lives for both humans and elephants. Competition for space is the primary reason for conflict between humans and elephants. Elephants that escape from the wildlife national parks venture into villages creating destruction in their wake. To prevent such mishaps, a proper system is required to contain and monitor elephants in national parks. In this paper, we describe different approaches to detect elephants and possible ways of monitoring the national wildlife parks. We also elaborate on the advantages and limitations of each approach, and determine what sort of system is needed to tame the human elephant conflict.
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| 6. |
- Hamza, Mohammed Ayyoob Ahamed, et al.
(författare)
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A Quadcopter Controller to Maintain Radio Link Quality
- 2015. - 8
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Ingår i: Proceedings of the First Workshop on Micro Aerial Vehicle Networks, Systems, and Applications for Civilian Use (DroNet '15). - New York, NY, USA : ACM. - 9781450335010 ; , s. 21-26
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Konferensbidrag (refereegranskat)abstract
- The excellent maneuverability and the availability of a large number of sensors including good quality video cameras make quadcopters attractive for surveillance systems. Most video surveillance systems need a real-time high quality video stream from the cameras on the quadcopter to the base station which requires a stable and reliable radio link. Moreover, to ensure a controlled flight, it is essential to maintain a good quality radio link from the base station to the quadcopter. The quality of this link depends on the distance between base station and quadcopter as well as the ambient noise. Towards this end, we present a controller to hover a quadcopter at the maximum distance from the base station while maintaining the link quality at a given value indicated by the Signal to Noise Ratio (SNR). There are existing solutions in the field of robotics that incorporate the concept of link aware mobility. However, to the best of our knowledge, this is the first link-quality aware mobility implementation on a quadcopter.
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| 7. |
- Keppitiyagama, Chamath I., et al.
(författare)
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Poster abstract : Temperature hints for sensornet routing
- 2013
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Ingår i: SenSys 2013 - Proceedings of the 11th ACM Conference on Embedded Networked Sensor Systems. - New York, NY, USA : Association for Computing Machinery. - 9781450320276
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Konferensbidrag (refereegranskat)abstract
- Real-world experiments have shown that the transmission power and the received signal strength of low-power radio transceivers used in sensornets decrease when temperature increases. We analyze how this phenomenon afects the network layer, and find that temperature uctuations may cause undesirable behavior by sensornet routing protocols such as CTP and RPL. Furthermore, we present an approach to make these protocols robust to temperature uctuations by augmenting the ETX link metric with temperature hints.
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| 8. |
- Mahima, K.T.Y, et al.
(författare)
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Fighting Dengue Fever with Aerial Drones
- 2022
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Ingår i: EWSN '22. - : Association for Computing Machinery (ACM). ; , s. 206-207
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Konferensbidrag (refereegranskat)abstract
- Dengue and Zika are two arboviral viruses that affect a significant portion of the world population. Each year, almost 400 million dengue infections happen. Due to severe dengue fever, around half a million people each year are in need of hospitalization and about 36.000 people die.Dengue spreads rapidly in densely populated urban areas. The principle vector species of both dengue and zika viruses are the Aedes aegypti and Aedes albopictus mosquitoes. They breed in very slow-flowing or standing water pools. It is important to reduce and control such potential breeding grounds to contain the spread of these diseases.We describe our system design and presents initial results. We employ mmWave radios to detect water retention areas as potential mosquito habitats. Next, we use multi-spectral images to analyze the water area, measure the depth of the water, and understand the larvae density. After that, we fuse the results for the final classification of the water area.
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| 9. |
- Poshitha, Dabare, et al.
(författare)
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Listening to the Giants : Using Elephant Infra-Sound to Solve the Human-Elephant Conflict
- 2015. - 10
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Ingår i: Proceedings of the 6th ACM Workshop on Real World Wireless Sensor Networks (RealWSN '15). - New York, NY, USA : ACM. - 9781450338400 ; , s. 23-26
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Konferensbidrag (refereegranskat)abstract
- The continuing human-elephant conict in Sri Lanka has resulted in loss of human as well as elephant lives. Detecting and localizing elephants is an essential component of any viable solution to this problem. Currently, we conduct feasibility tests on using low cost sensors to detect elephants from a long distance, leveraging the infra-sounds emitted by them. In this paper we present the test environment that we have set up for this purpose and some preliminary, but promising results.
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| 10. |
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