Energy-Efficient Models for Coverage Problem Using Sensors with Adjustable Sensing Ranges

Nguyen, Ngoc Duy; Zalyubovskiy, Vyacheslav V.; Ha, Minh Thiep; Choo, Hyunseung

doi:10.1109/wcnc.2010.5506555

Cited by 8 publications

(10 citation statements)

References 14 publications

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“…[5,6] However, if we use ellipses, then we will see that it is possible to obtain the same density for the covers that use either triangle or square, or hexagonal tiles.…”

Section: Problem Formulation In This Paper We Consider the Problem mentioning

confidence: 97%

“…Let us consider the next coverage model in the class C OV 3 (6,2). In every cover in this coverage model, the centres of equal pairwise intersecting discs are located in the nodes of a triangular tile, and a curvilinear triangle in the centre of the tile is covered by three equal ellipses with one common point (Figure 1(b)).…”

Section: Coverage By Ellipses Of Two Typesmentioning

confidence: 99%

“…Therefore, an optimal cover of a planar region with discs or ellipses (when every point of a region belongs to at least one disc or ellipse) is the cover that has minimal density, where the density of the plane region's cover is the ratio of the sum of the elements' areas in the cover to the region's area. [4][5][6][7][8]11,13] Since every disc can be placed at any place of a plane, there is an infinite set of plane covers using discs. [4,7,8,13] The most studied covers are regular covers, [2][3][4][5][6]9,10] where a planar region is tiled by identical regular polygons (tiles), and all of the tiles are covered equally.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Covering a plane with ellipses

Erzin

Astrakov

2013

Optimization

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This paper is devoted to the construction of regular min-density plane coverings with ellipses of one, two and three types. This problem is relevant, for example, to power-efficient surface sensing by autonomous above-grade sensors. A similar problem, for which discs are used to cover a planar region, has been well studied. On the one hand, the use of ellipses generalizes a mathematical problem; on the other hand, it is necessary to solve these types of problems in real applications of wireless sensor networks. This paper both extends some previous results and offers new regular covers that use a small number of ellipses to cover each regular polygon; these covers are characterized by having minimal known density in their classes and give the new upper bounds for densities in these classes as well.

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“…[5,6] However, if we use ellipses, then we will see that it is possible to obtain the same density for the covers that use either triangle or square, or hexagonal tiles.…”

Section: Problem Formulation In This Paper We Consider the Problem mentioning

confidence: 97%

Section: Coverage By Ellipses Of Two Typesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Covering a plane with ellipses

Erzin

Astrakov

2013

Optimization

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“…The first one is the search among points of the continuous set Ω \ P . For this purpose methods for the area coverage problem in sensor networks may be useful [18,19].…”

Section: A Location Problem For Wsns With Wireless Chargersmentioning

confidence: 99%

Location Problems in Renewable Sensor Networks With Wireless Energy Transfer

Migov¹

2016

bncc.cs

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Abstract. The area of wireless sensor networks (WSNs) has recently received a lot of attention. Nevertheless, the major problem is the finite electrical batteries in sensors, which prevents the wide use of WSNs. However, technologies of the wireless energy transfer may be applied to solve energy problems in WSNs with the use of wireless energy chargers. In this study we offer the techniques of finding the points, which are most suitable for a simultaneous omnidirectional wireless charge of a group of sensors. The wireless chargers in question can be both mobile or static. The stated problems are quite similar to the problems of p-center and p-median location in a graph and may be solved by appropriate methods. The approach proposed may significantly decrease a path of a mobile charger when traversing places for recharging sensors. For the WSNs with static wireless chargers these optimal points are useful for the chargers deployment.

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“…Because of the waves from tidal and ships can produce movements in the WSNs, the system must be prepared to assume these movements and changes of locations from its initial deployment. Generally, underwater WSNs are used to cover higher areas than terrestrial WSNs (Nguyen et al, 2012), the energy consumption will be higher and the signals are attenuated in the underwater environments. So, it is important to implement energy-efficient techniques in data processing , (Jain et al, 2015) and energy harvesting solutions to prolong the network lifetime (Legakis et al, 2015) and network stability.…”

Section: The Information and Communication Technologies And The Wsnmentioning

confidence: 99%

Study of requirements and design of sensors for monitoring water quality and feeding process in fish farms and other environments

Boronat¹

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There are many efforts done in the aquaculture to reach its sustainability, although in reality, it is far from being sustainable. Its negative impacts on the environment can be prevented and corrected by the use of sensors, developing precision aquaculture. The water quality affects to the fish performance. The temperature and salinity are some factors that affect to the fish growth. Nevertheless, other factors such as turbidity, photoperiod and dissolved oxygen among other can affect to the fish feeding needs. To adjust the amount of feed needed is crucial to ensure the sustainability of the aquaculture and to increase the economic profit of the facilities. Monitoring the water quality allows estimating the feed needs. However, it is not enough. To monitor the fish behavior, especially during the feeding period can help to adapt the provided feed. Then, if it is so clear that the monitoring can help to the aquaculture production, why we do not see this monitoring systems in the aquaculture facilities? Why in most of the facilities the feed is given manually without considering the fish feeding behavior?Nevertheless, the current price of the sensors for monitoring the fish farms is extremely high. The employed sensors are in most of the cases, the same that are used for oceanography. The proposed systems in the literature only cover some water quality parameters and usually do not consider fish feeding behavior. It is need low-cost sensors suitable for aquaculture monitoring. Those sensors must also be low-energy consumption, easy to use and with the option to include them in a network in order to send the data. Thus, we can use these sensors and sensors network to monitor the activity, to send alarms if it is necessary and to automatize processes. Moreover, including Internet, the data can be seen remotely. The use of those sensors can help to the aquaculture production.In this thesis, we show the study of requirements and design of sensors for monitoring water quality and feeding process in fish farms and other environments. First, we study in detail the requirements of sensors in aquaculture. Then, we show the state of the art of the current sensors for water quality monitoring and for aquaculture monitoring.Following, we present the design and development of some low-cost sensors and their applications in fish farm facilities with open system and recirculating system. Moreover we show a complete system which monitors up to 10 parameters including water quality (temperature, salinity, turbidity and presence of hydrocarbon/oil layer), tank environment (water level, illumination, presence of workers), and fish feeding behavior (shoal swimming depth, estimation of changes on shoal swimming velocity and feed falling). Moreover, it accomplishes the features of low-cost and low energy consumption. The estimated price for proposed system is less than 100€ per tank. In addition, we show the use of some of the aforementioned sensors for automatic adjustment of fish feeding process.Finally, some of the develop...

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Energy-Efficient Models for Coverage Problem Using Sensors with Adjustable Sensing Ranges

Cited by 8 publications

References 14 publications

Covering a plane with ellipses

Covering a plane with ellipses

Location Problems in Renewable Sensor Networks With Wireless Energy Transfer

Study of requirements and design of sensors for monitoring water quality and feeding process in fish farms and other environments

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