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location-based-services
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Enhancing Privacy in Location-Based Services
, M.Sc. Thesis Sharif University of Technology ; Jalili, Rasool (Supervisor)
Abstract
Mobile localization development, is the reason for appearance of location-based services (LBS). Be sure of not disclosing the user personal information is the main challenge in LBS. Many different concepts and approaches for the protection of location privacy have been described in the literature which change the query of user to server. These approaches falling roughly into two main categories: centralized and distributed (user-centric). Centralized category includes approaches like “changing query pattern” using encryption on user device, or using an “anonymizer trusted third party”. In such approaches threat of an untrustworthy LBS server is addressed by the introduction of a new...
Call Centers' System Optimization in Condition of Uncertain Capacity and Space Constraints
, M.Sc. Thesis Sharif University of Technology ; Modarres Yazdi, Mohammad (Supervisor)
Abstract
In this thesis, we study the problems of staffing and controlling queueing systems with an uncertain number of servers and space constraints. We assume that agents are allowed to set their schedules. Furthermore, in the condition that there are space constraints in each shift, a model is presented to obtain the number of agents we need to hire from the beginning by minimizing the daily cost incurred by the manager. Due to the uncertainties in the system, the model solves the problem by considering the different modes that may occur in each shift. Because randomness in the number of agents creates congestion in the system, and also special health conditions that may arise in a call center...
Mobile Location Determination Using Power of Arrivals
, M.Sc. Thesis Sharif University of Technology ; Manzuri Shalmani, Mohammad Taghi (Supervisor)
Abstract
Today, communication sciences are advancing very rapidly; one of these advances is mobile location determination, means finding position of a mobile station. there are some method to location determination; one of these methods is Signal Strength (Power of Arrivals); In this research, Mobile Location Determination using Signal strength measurements in a Location grid will be describe; In this method there is a Mobile Location Server (MLS); In MLS, there re comparable records in database which have been collected from Location grid. When a MS needs to be located, its signaling data (fingerprint) is transmitted to MLS; In MLS, the fingerprints are compared to Data which is store in signature...
A vagueness-based obfuscation technique for protecting location privacy
, Article Proceedings - SocialCom 2010: 2nd IEEE International Conference on Social Computing, PASSAT 2010: 2nd IEEE International Conference on Privacy, Security, Risk and Trust, 20 August 2010 through 22 August 2010 ; August , 2010 , Pages 865-872 ; 9780769542119 (ISBN) ; Sharif University of Technology
2010
Abstract
Technical evolution of location technologies has augmented the development and growth of location-based services. With widespread adoption of these services, threats to location privacy are increasing, entailing more robust and sophisticated solutions. This paper proposes an intuitive obfuscation-based scheme, which uses vagueness in human perception of nearness to provide a flexible and robust location privacy scheme. Key to this work is the concept of vagueness degree, which aims to enhance its robustness against privacy attacks. Furthermore, our scheme is totally in line with human perception of privacy and provides a solution, which mostly suits proximity-based services, social...
2PLoc: Preserving privacy in location-based services
, Article Proceedings - SocialCom 2010: 2nd IEEE International Conference on Social Computing, PASSAT 2010: 2nd IEEE International Conference on Privacy, Security, Risk and Trust, 20 August 2010 through 22 August 2010 ; August , 2010 , Pages 707-712 ; 9780769542119 (ISBN) ; Kharrazi, M ; Jalili, R ; Sharif University of Technology
2010
Abstract
Location-based services are becoming popular for mobile users. The mobile users' location plays a key role to provide the service from one side, but it can be considered as a dimension of their privacy and so necessary to keep it anonymous to the other parties. Since one important issue is to achieve an accurate service, it is important to use the mobile's accurate location. Using the location accurately raises some concerns on behalf of the user's privacy. One solution for meeting this requirement is using tickets by the means of a third party. The tickets should have some properties for not letting a mobile user to cheat and use the ticket more than one time. This paper proposes a protocol...
Mobile positioning using enhanced signature database method and error reduction in location grid
, Article Proceedings - 2009 WRI International Conference on Communications and Mobile Computing, CMC 2009, 6 January 2009 through 8 January 2009, Kunming, Yunnan ; Volume 2 , 2009 , Pages 175-179 ; 9780769535012 (ISBN) ; Naderi, A. M ; Sharif University of Technology
2009
Abstract
Today, communication science is advancing very rapidly; one of these advances is mobile location determination which means finding position of a mobile station. There are some methods to location determination; one of these methods is Signal Strength (Power of Arrivals). In this research, Mobile Location Determination using enhanced signature database method in a Location grid will be introduced; several ways for positioning error reduction will also be described. © 2009 IEEE
Protecting location privacy through a graph-based location representation and a robust obfuscation technique
, Article 11th International Conference on Information Security and Cryptology, ICISC 2008, Seoul, 3 December 2008 through 5 December 2008 ; Volume 5461 , 2009 , Pages 116-133 ; 03029743 (ISSN) ; Ravari, A. N ; Amini, M ; Jalili, R ; Sharif University of Technology
2009
Abstract
With technical advancement of location technologies and their widespread adoption, information regarding physical location of individuals is becoming more available, augmenting the development and growth of location-based services. As a result of such availability, threats to location privacy are increasing, entailing more robust and sophisticated solutions capable of providing users with straightforward yet flexible privacy. The ultimate objective of this work is to design a privacy- preserving solution, based on obfuscation techniques (imprecision and inaccuracy), capable of handling location privacy, as required by users and according to their preferences. To this aim, we propose an...