Thesis on crowdsourcing

Embed a Google Map, Dipity Timeline, etc. This is achieved by creating a public forum for student expressions; building critical thinking into the culture of classroom routines; and using rich resources to augment core course content.

Thesis on crowdsourcing

This is an open access article distributed under the Creative Commons Attribution Licensewhich permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Abstract Indoor positioning systems IPS use sensors and communication technologies to locate objects in indoor environments.

IPS are attracting scientific and enterprise interest because there is a big market opportunity for applying these technologies. There are many previous surveys on indoor positioning systems; however, most of them lack a solid classification scheme that would structurally map a wide field such as IPS, or omit several key technologies or have a limited perspective; finally, surveys rapidly become obsolete in an area as dynamic as IPS.

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The goal of this paper is to provide a technological perspective of indoor positioning systems, comprising a wide range of technologies and approaches. Further, we classify the existing approaches in a structure in order to guide the review and discussion of the different approaches.

Finally, we present a comparison of indoor positioning approaches and present the evolution and trends that we foresee. Introduction Position location of a user or a device in a given space is one of the most important elements of contextual information.

The widespread use of sensors has produced an increasing wealth of such information. By itself, location has generated great attention because of its potential to leverage commercial applications such as advertisement and social networks [ 1 ].

The adaptation to a changing context is precisely what makes those next-generation systems flexible and robust [ 1 ]. Location detection has been very successfully implemented at outdoor environments using GPS technology [ 2 ].

The GPS has made a tremendous impact on our everyday lives by supporting a wealth of applications in guidance, mapping, and so forth [ 3 ]. Nevertheless, in indoor environments, the usability of the GPS or equivalent satellite-based location systems is limited, due to the lack of line of sight and attenuation of GPS signals as they cross through walls.

Indeed, precision of some 50 meters inside a commercial setting is useless with respect to a task such as locating specific merchandise on a shelf.

Thus, the need for specialized methods and technologies for indoor location systems also called indoor positioning systems, IPS has been widely accepted [ 4 — 11 ]. Many surveys have been written based on various IPS related topics [ 12 — 16 ]. However, most of them omit several relevant technologies, have a limited perspective, or lack a classification structure.

Also, the lack of a classification scheme that would guide the readers in a clean way is a serious flaw of some otherwise good surveys [ 15 ].

Furthermore, an updated survey in indoor positioning systems is always welcome as this is a rapidly evolving area and a decade-old review can be considered outdated.

Previous surveys comparison, including ours. In this survey, we review the field of indoor positioning systems IPS because it presents specific features, challenges, and opportunities.

Indoor settings are mostly full of obstacles that obstruct the signals between emitters and receivers, and a wide variety of materials, shapes, and sizes affect signal propagation more than in outdoor scenarios. IPS face an interesting technical challenge due to the great variety of possible sensor technologies that can be applied, each one with different strengths and weaknesses.

The focus of this particular survey is precisely on reviewing the different technologies that have been used for IPS. We present a comprehensive review of the literature on indoor positioning systems, with the goal of providing a technological perspective of IPS evolution, making the distinction between different technological approaches by using a classification scheme, and presenting the evolution and trends of the field.

We stress that although outdoor positioning techniques could be used in indoor environments, these are left out of our scope because this survey is specialized specifically in indoor technologies. Then, in Section 4we proceed to present the review of indoor positioning technologies, which is the main subject of this report.

After that, Section 5 presents a comparison of location technologies. Finally, in Section 6we present a discussion, forecasting the possible evolution that indoor positioning systems will have in the years to come, and some conclusions.

Also, some otherwise good reviews lack a classification scheme that would allow the reader to organize the different works in some conceptual structure more useful than a flat and an unorganized list. The most representative example of this flaw is the otherwise very good review by Mautz [ 15 ], where a flat list of 16 technologies is presented in a sequential order, with no classification whatsoever.

In our paper, we introduce thorough classification criteria that will partition the set of different works, making it more manageable and providing a conceptual structure for mapping the IPS field.

Furthermore, some classification schemes proposed in previous reviews are not sound; for instance, Gu et al.Akash Kapur Senior Fellow. Akash Kapur is a Senior Fellow at the GovLab.

Thesis on crowdsourcing

Akash has consulted for a variety of organizations (including UNDP and The Markle Foundation) on issues including Internet governance, the digital divide, open data, and health IT.

Open data is the idea that some data should be freely available to everyone to use and republish as they wish, without restrictions from copyright, patents or other mechanisms of control. The goals of the open-source data movement are similar to those of other "open(-source)" movements such as open-source software, hardware, open content, open education, open educational resources, open.

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Akash Kapur Senior Fellow. Akash Kapur is a Senior Fellow at the GovLab. Akash has consulted for a variety of organizations (including UNDP and The Markle Foundation) on issues including Internet governance, the digital divide, open data, and health IT.

Ekiden: A Platform for Private, Trustworthy, and Performant Smart Contract Execution UC Berkeley Security Research Lab - Raymond Cheng, et. al. Existing smart contracts systems inherit the availability and other security assurances of blockchains, however, they are impeded by blockchains’ lack of confidentiality and poor performance.

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