Indoor positioning using differential Wi-Fi lateration

2017 ◽  
Vol 11 (4) ◽  
Author(s):  
Guenther Retscher ◽  
Thomas Tatschl
Keyword(s):  
Mobile User ◽  
Office Building ◽  
Wall Model ◽  
Position Errors ◽  
Area Of Interest ◽  
Location Fingerprinting ◽  
Propagation Effects ◽  
The Common ◽  
Temporal And Spatial ◽  
The One

AbstractFor Wi-Fi positioning usually location fingerprinting or (tri)lateration are employed whereby the received signal strengths (RSSs) of the surrounding Wi-Fi Access Points (APs) are scanned on the mobile devices and used to perform localization. Within the scope of this study, the position of a mobile user is determined on the basis of lateration. Two new differential approaches are developed and compared to two common models, i.e., the one-slope and multi-wall model, for the conversion of the measured RSS of the Wi-Fi signals into ranges. The two novel methods are termed DWi-Fi as they are derived either from the well-known DGPS or VLBI positioning principles. They make use of a network of reference stations deployed in the area of interest. From continuous RSS observations on these reference stations correction parameters are derived and applied by the user in real-time. This approach leads to a reduced influence of temporal and spatial variations and various propagation effects on the positioning result. In practical use cases conducted in a multi-storey office building with three different smartphones, it is proven that the two DWi-Fi approaches outperform the common models as static positioning yielded to position errors of about 5 m in average under good spatial conditions.

scholarly journals FUSION OF LOCATION FINGERPRINTING AND TRILATERATION BASED ON THE EXAMPLE OF DIFFERENTIAL WI-FI POSITIONING

2017 ◽  
Vol IV-2/W4 ◽  
pp. 377-384 ◽  
Author(s):  
G. Retscher
Keyword(s):  
Low Cost ◽  
Mobile User ◽  
Reference Station ◽  
Raspberry Pi ◽  
Indoor Environments ◽  
Differential Gps ◽  
Area Of Interest ◽  
Location Fingerprinting ◽  
Novel Approach ◽  
Interest Differential

Positioning of mobile users in indoor environments with Wireless Fidelity (Wi-Fi) has become very popular whereby location fingerprinting and trilateration are the most commonly employed methods. In both the received signal strength (RSS) of the surrounding access points (APs) are scanned and used to estimate the user’s position. Within the scope of this study the advantageous qualities of both methods are identified and selected to benefit their combination. By a fusion of these technologies a higher performance for Wi-Fi positioning is achievable. For that purpose, a novel approach based on the well-known Differential GPS (DGPS) principle of operation is developed and applied. This approach for user localization and tracking is termed Differential Wi-Fi (DWi-Fi) by analogy with DGPS. From reference stations deployed in the area of interest differential measurement corrections are derived and applied at the mobile user side. Hence, range or coordinate corrections can be estimated from a network of reference station observations as it is done in common CORS GNSS networks. A low-cost realization with Raspberry Pi units is employed for these reference stations. These units serve at the same time as APs broadcasting Wi-Fi signals as well as reference stations scanning the receivable Wi-Fi signals of the surrounding APs. As the RSS measurements are carried out continuously at the reference stations dynamically changing maps of RSS distributions, so-called radio maps, are derived. Similar as in location fingerprinting this radio maps represent the RSS fingerprints at certain locations. From the areal modelling of the correction parameters in combination with the dynamically updated radio maps the location of the user can be estimated in real-time. The novel approach is presented and its performance demonstrated in this paper.

scholarly journals The Study of Digital Identity of Mobile Users Based on Android Dataset

2021 ◽  
Vol 12 (3) ◽  
pp. 2106-2113
Author(s):  
A. R. Mohd Shariff Et.al
Keyword(s):  
Mobile User ◽  
Mobile Users ◽  
Statistical Relationship ◽  
Single Variable ◽  
Digital Identity ◽  
Mobile Data ◽  
Unique Identity ◽  
Correlation Measures ◽  
Temporal And Spatial ◽  
The One

A smartphone is said to be an extension of a mobile user’s oneself. It is the ultimate mobile device today for humans, the one device that humans cannot avoid using, leave behind when on the move and becomes a necessity to own one. It allows humans to communicate and perform many daily personal tasks. Smartphones continue to evolve embedding advanced device technologies, sophisticated processes and applications. This symbiotic combination generates immense data on a temporal and spatial scale for a mobile user. These data represent the behaviors of a mobile user, which is unique. In the digital mobile realm, there exists some digital identity about a mobile user, what can be thought as the mobile user’s digital pheromone. This data mining study uses Android Device Analyzer dataset consists of Battery Level, Battery Temperature, Battery Volt and App variables to understand the levels of volatility and their correlation measures. The finding shows there are wide dispersions for Battery Level, Battery Temp, Battery Volt and no statistical relationship exists for Battery Volt/App and Battery Temp/App correlation. Using a simple inequality that only a limited number of mobile users are contained within one standard deviation from the population mean, a smaller set of users exists. The results show that ‘uniqueness’ percentage of a mobile user increased from 61.7% and 66.7% for single variable to 81.7% in multi-variate condition, to 100% using the simple inequality. Ultimately, this uniqueness indicates that a mobile user can have a unique identity, in the digital mobile world from the daily mobile data generated.

THE EU SUGAR MARKET PROFILE AND ITS MAIN DRIVERS

2015 ◽  
Author(s):  
Lubos SMUTKA ◽  
Irena BENEŠOVÁ ◽  
Patrik ROVNÝ ◽  
Renata MATYSIK-PEJAS
Keyword(s):  
Market Failure ◽  
Current System ◽  
Quota System ◽  
Considerable Debate ◽  
Sugar Market ◽  
The Common ◽  
The One ◽  
Production Capacities ◽  
The Given ◽  
The Eu

Sugar is one of the most important elements in human nutrition. The Common Market Organisation for sugar has been a subject of considerable debate since its establishment in 1968. The European agricultural market has been criticized for its heavy regulations and subsidization. The sugar market is one of the most regulated ones; however, this will change radically in 2017 when the current system of production quotas will end. The current EU sugar market changed is structure during the last several decades. The significant number of companies left the market and EU internal sugar market became more concentrated. The aim of this paper is presentation characteristics of sugar market with respect to the supposed market failure – reduction in competition. The analysis also identifies the main drivers and determinants of the EU especially quota sugar market. In relation to paper’s aim the following results are important. The present conditions of the European sugar market have led to market failure when nearly 75 % (10 million tonnes) of the quota is controlled by five multinational companies only. These multinational alliances (especially German and French one) are also taking control over the production capacities of their subsidiaries. In most countries, this causes serious problems as the given quota is controlled by one or two producers only. This is a significant indicator of market imperfection. The quota system cannot overcome the problem of production quotas on the one hand and the demand on the other; furthermore, it also leads to economic inefficiency. The current EU sugar market is under the control of only Sudzucker, Nordzucker, Pfeifer and Langen, Tereos and ABF.

The concept of motivation for effective credit risk management

2020 ◽  
Vol 26 (11) ◽  
pp. 2567-2593
Author(s):  
M.V. Pomazanov
Keyword(s):  
Risk Management ◽  
Economic Modeling ◽  
Type I ◽  
Credit Risk Management ◽  
Curve Modeling ◽  
Business Functions ◽  
The Common ◽  
Lending Decisions ◽  
The One

Subject. The study addresses the improvement of risk management efficiency and the quality of lending decisions made by banks. Objectives. The aim is to present the bank management with a fair algorithm for risk management motivation on the one hand, and the credit management (business) on the other hand. Within the framework of the common goal to maximize risk-adjusted income from loans, this algorithm will provide guidelines for ‘risk management’ and ‘business’ functions on how to improve individual and overall efficiency. Methods. The study employs the discriminant analysis, type I and II errors, Lorentz curve modeling, statistical analysis, economic modeling. Results. The paper offers a mechanism for assessing the quality of risk management decisions as opposed to (or in support of) decisions of the lending business when approving transactions. The mechanism rests on the approach of stating type I and II errors and the corresponding classical metric of the Gini coefficient. On the ‘business’ side, the mechanism monitors the improvement or deterioration of the indicator of changes in losses in comparison with the market average. Conclusions. The study substantiates the stimulating ‘rules of the game’ between the ‘business’ and ‘risk management’ to improve the efficiency of the entire business, to optimize interactions within the framework of internal competition. It presents mathematical tools to calculate corresponding indicators of the efficiency of internally competing entities.

Road names in Vologda dialect: semantics, derivational relations

2018 ◽  
Vol 79 (7) ◽  
pp. 77-82
Author(s):  
E. P. Andreeva
Keyword(s):  
Lexical Item ◽  
The Road ◽  
Russian Word ◽  
The Common ◽  
The One

The road image in the worldview of Northern-Russian countryman is described in the article. The semantic and derivational potential of the common Russian word in the dialect context is analyzed, the motivated reasons of the dialect words named ‘place, area that is moving on’are defined. The language means explicating characteristics of the one of the key images in the dialect linguistic worldview are marked. The article purpose is show the functioning of the common Russian word road in the dialect from the one side and to watch what other dialect units make the list of the lexical item group, what links and relations are among them.

The Problem of the Typology of Rationality in Muslim Culture

2019 ◽  
Vol 62 (6) ◽  
pp. 88-99
Author(s):  
Andrey A. Lukashev
Keyword(s):  
Modern Philosophy ◽  
Theoretical Basis ◽  
Theoretical Models ◽  
The Other ◽  
Common Denominator ◽  
Islamic Culture ◽  
The Common ◽  
Per Se ◽  
The One ◽  
Muslim Culture

The typology of rationality is one of major issues of modern philosophy. In an attempt to provide a typology to Oriental materials, a researcher faces additional problems. The diversity of the Orient as such poses a major challenge. When we say “Oriental,” we mean several cultures for which we cannot find a common denominator. The concept of “Orient” involves Arabic, Indian, Chinese, Turkish and other cultures, and the only thing they share is that they are “non-Western.” Moreover, even if we focus just on Islamic culture and look into rationality in this context, we have to deal with a conglomerate of various trends, which does not let us define, with full confidence, a common theoretical basis and treat them as a unity. Nevertheless, we have to go on trying to find common directions in thought development, so as to draw conclusions about types of rationality possible in Islamic culture. A basis for such a typology of rationality in the context of the Islamic world was recently suggested in A.V. Smirnov’s logic of sense theory. However, actual empiric material cannot always fit theoretical models, and the cases that do not fit the common scheme are interesting per se. On the one hand, examination of such cases gives an opportunity to specify certain provisions of the theory and, on the other hand, to define the limits of its applicability.

OnPoint: A package for online experiments in motor control and motor learning

2020 ◽  
Author(s):  
Jonathan Sanching Tsay ◽  
Alan S. Lee ◽  
Guy Avraham ◽  
Darius E. Parvin ◽  
Jeremy Ho ◽  
...  
Keyword(s):  
Motor Control ◽  
Motor Learning ◽  
Open Source Software ◽  
Research Progress ◽  
Global Pandemic ◽  
Large N ◽  
Open Source Software Package ◽  
Potential Applications ◽  
Temporal And Spatial ◽  
The One

Motor learning experiments are typically run in-person, exploiting finely calibrated setups (digitizing tablets, robotic manipulandum, full VR displays) that provide high temporal and spatial resolution. However, these experiments come at a cost, not limited to the one-time expense of purchasing equipment but also the substantial time devoted to recruiting participants and administering the experiment. Moreover, exceptional circumstances that limit in-person testing, such as a global pandemic, may halt research progress. These limitations of in-person motor learning research have motivated the design of OnPoint, an open-source software package for motor control and motor learning researchers. As with all online studies, OnPoint offers an opportunity to conduct large-N motor learning studies, with potential applications to do faster pilot testing, replicate previous findings, and conduct longitudinal studies (GitHub repository: https://github.com/alan-s-lee/OnPoint).

Raanan Rein, Fútbol, Jews and the Making of Argentina, trans. Marsha Grenzeback. Stanford: Stanford University Press, 2014. 166 pp.

2018 ◽  
Keyword(s):  
United States ◽  
Jewish Identity ◽  
The United States ◽  
Orthodox Jewish ◽  
Literary Representations ◽  
Stanford University ◽  
Common Theme ◽  
American Jews ◽  
The Common ◽  
The One

This chapter reviews the books Fútbol, Jews and the Making of Argentina (2014), by Raanan Rein, translated by Marsha Grenzeback, and Muscling in on New Worlds: Jews, Sport, and the Making of the Americas (2014), edited by Raanan Rein and David M.K. Sheinin. Rein’s book deals with the “making” of Argentina through football (soccer), while Muscling in on New Worlds focuses on the “making” of the Americas (mainly the one America, called the United States) through sports. Muscling in on New Worlds is a collection of essays that seeks to advance the common theme of sport as “an avenue by which Jews threaded the needle of asserting a Jewish identity.” Topics include Jews as boxers, Jews and football, Jews and yoga, Orthodox Jewish athletes, and American Jews and baseball. There are also essays about the cinematic and literary representations of Jews in sports.

The Rubicon of Language

2018 ◽  
Author(s):  
Sebastian Lecourt
Keyword(s):  
The Other ◽  
Racial Identities ◽  
Other Hand ◽  
Max Müller ◽  
The Common ◽  
Human Capacity ◽  
The One ◽  
Religious Differences

This chapter considers a series of formative debates in British anthropology from the 1840s through the 1860s and uses them to map out the two dominant constructions of religion whose politics the subsequent authors in this study would reinvent. It describes, on the one hand, a liberal and evangelical construction of religion as the common human capacity for spiritual cultivation, and on the other hand a conservative, reactionary model that interpreted religious differences as the expressions of fixed racial identities that neither civilization nor Christianization could erase. In the work of the Oxford philologist F. Max Müller we see how the former model tended to associate religion above all with language. But we can also see the subtle forms of determinism that it contained—an ambiguity that Arnold, Pater, Eliot, and Lang would explore by picturing racialized religion as a resource for liberal self-cultivation.

Pensare Dio. Spunti di riflessione in dialogo con Anca Vasiliu

Elenchos ◽  
2020 ◽  
Vol 41 (1) ◽  
pp. 181-194
Author(s):  
Angela Longo
Keyword(s):  
Late Antiquity ◽  
Human Being ◽  
Common Thread ◽  
Critical Issues ◽  
Relevant Topic ◽  
The Common ◽  
The One ◽  
Relationship Of ◽  
The Relationship ◽  
The Trinity

AbstractThe following work features elements to ponder and an in-depth explanation taken on the Anca Vasiliu’s study about the possibilities and ways of thinking of God by a rational entity, such as the human being. This is an ever relevant topic that, however, takes place in relation to Platonic authors and texts, especially in Late Antiquity. The common thread is that the human being is a God’s creature who resembles him and who is image of. Nevertheless, this also applies within the Christian Trinity according to which, not without problems, the Son is the image of the Father. Lastly, also the relationship of the Spirit with the Father and the Son, always within the Trinity, can be considered as a relationship of similarity, but again not without critical issues between the similarity of attributes, on the one hand, and the identity of nature, on the other.

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