Location-dependent query processing

Ilarri, Sergio; Mena, Eduardo; Illarramendi, Arantza

doi:10.1145/1670679.1670682

Cited by 132 publications

(18 citation statements)

References 321 publications

(379 reference statements)

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“…The region consists of a polygon with a finite number of vertices, and it may be either convex or non-convex. There are existing algorithms for determining if a queried point (e.g., a footstep location) is within either a simple polygon (Shimrat, 1962) or a non-simple (i.e., self-intersecting) polygon (Chinn and Steenrod, 1966), and these became well-established first for computer graphics (Sutherland et al, 1974) and later in techniques for processing queries to geospatial databases (Jacox and Samet, 2007;Ilarri et al, 2010). When there is only one region of interest then a point either wholly inside the polygon or on a boundary line segment is treated as being in the region.…”

Section: Footstep Track Evaluation Modulementioning

confidence: 99%

A Framework for Occupancy Tracking in a Building via Structural Dynamics Sensing of Footstep Vibrations

Poston

Buehrer

Tarazaga

2017

Front. Built Environ.

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Counting the number of occupants in building areas over time-occupancy tracking-provides valuable information for responding to emergencies, optimizing thermal conditions or managing personnel. This capability is distinct from tracking individual building occupants as they move within a building, has lower complexity than conventional tracking algorithms require, and avoids privacy concerns that tracking individuals may pose. The approach proposed here is a novel combination of data analytics applied to measurements from a building's structural dynamics sensors (e.g., accelerometers or geophones). Specifically, measurements of footstep-generated structural waves provide evidence of occupancy in a building area. These footstep vibrations can be distinguished from other vibrations, and, once identified, the footsteps can be located. These locations, in turn, form the starting point of estimating occupancy in an area. In order to provide a meaningful occupancy count, however, it is first necessary to associate discrete footsteps with individuals. The proposed framework incorporates a tractable algorithm for this association task. The proposed algorithms operate online, updating occupancy count over time as new footsteps are detected. Experiments with measurements from a public building illustrate the operation of the proposed framework. This approach offers an advantage over others based on conventional technologies by avoiding the cost of a separate sensor system devoted to occupancy tracking.

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Section: Footstep Track Evaluation Modulementioning

confidence: 99%

A Framework for Occupancy Tracking in a Building via Structural Dynamics Sensing of Footstep Vibrations

Poston

Buehrer

Tarazaga

2017

Front. Built Environ.

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“…LOQOMOTION LOQOMOTION [34] is a mobile agent-based architecture for distributed processing of continuous location-dependent queries that are issued by mobile users, which allows the retrieval of objects' locations and other interesting data. LOQOMOTION process queries on static and dynamically moving objects with respect to their location, whereas other approaches only focus on queries about static objects that are in the vicinity of a certain static or moving object, objects moving within a fixed region, etc.,.…”

Section: Kmentioning

confidence: 99%

Multi Agents for Context Awareness in Ambient Intelligence: A Survey

Babu¹,

Sivakumar²

2015

IJERT

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Ambient Intelligence (AmI) systems need the integration of innovative technology and complex environment for better solutions. In this sense, agents and multi-agent systems have characteristics such as reactivity, reasoning, pro-activity, autonomy, and social abilities which make them appropriate for developing distributed systems based on Ambient Intelligence. In addition, the utilization of context-aware technologies is an important aspect in these developments in order to perceive stimuli from the context and react to it autonomously. To the best of our knowledge a very small work has been done in Multi Agent based approaches for context awareness in Ambient Intelligence. In this paper some of the approaches were surveyed and lists of main requirements are identified for future research directions in this emerging domain. This paper discusses on the main objective and characteristics of the surveyed approaches and highlights the challenges to be addressed when designing and developing Multi Agent based approaches for context awareness in AmI.

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“…Moving objects must update their location to the server according to a certain policy. Therefore these approaches cannot be used when it is not possible to set an update policy on the moving objects or when the objects do not explicitly communicate with the server [9]. Also their approach may overload the user devices and increase the wireless communication overheads.…”

Section: A Distributed Query Processingmentioning

confidence: 99%

“…But this scheme does not address the problem of range queries where the range of the query overlaps with neighboring cells, or partially out of the cell, especially when the mobile is at the edge of the outer cell. Also the data are served from the central server and so, the overhead in the central server is quite high [9]. To reduce the overhead in central server, several caching schemes have been proposed [5,11].…”

Section: Related Workmentioning

confidence: 99%

A Proxy based Framework for Efficient Range Query Processing in a Cellular Network

Ilyas¹,

Vijayakumar²

2010

IJITCS

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Within the last decade, the continuous development of mobile technology has motivated an intense research in mobile data services. Among these services, location-based services and location-dependant queries have attracted a lot of attention from the software industry as well as from researchers. Although a number of locations based service methods have been proposed, the performance is not satisfactory in the case of dynamic data management problems that introduce high overhead in update and query operations. In this paper, we introduce a proxy based distributed dynamic data management architecture for location based services that reduces network cost with required quality of service (QoS). The system proposes a distributed hierarchical database structure with collocated proxy for efficient service delivery to location-dependant queries especially Range Queries (RQ). The system that we propose have the following advantages. i) It performs efficient processing of location dependant queries, especially Range Queries spanning over multiple network cells ii) It reduces wireless communication between mobile devices and servers. iii) The system is scalable where location data is distributed and arranged hierarchically. We use proxy objects to carry out processing task for each mobile user. Thus proxies play an important role and in charge of routing the queries to different (distributed) databases and present the results to queries efficiently. Simulation study shows the effectiveness of our proposed architecture.

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Location-dependent query processing

Cited by 132 publications

References 321 publications

A Framework for Occupancy Tracking in a Building via Structural Dynamics Sensing of Footstep Vibrations

A Framework for Occupancy Tracking in a Building via Structural Dynamics Sensing of Footstep Vibrations

Multi Agents for Context Awareness in Ambient Intelligence: A Survey

A Proxy based Framework for Efficient Range Query Processing in a Cellular Network

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