Loading...
Search for:
mobility
0.011 seconds
Total 735 records
Mobility in file sharing
, Article 11th International Conference on Distributed Multimedia Systems, DMS 2005, 5 September 2005 through 7 September 2005 ; 2005 , Pages 155-160 ; 1891706179 (ISBN) ; Haghighat, A ; Noroozi, N ; Sharif University of Technology
Knowledge Systems Institute Graduate School
2005
Abstract
New advances in technology of mobile computers along with advent of wireless and mobile networking bring new capabilities, applications and concerns to the computer world. In this paper, we discussed on file sharing requirements in a mobile environment. Then, we proposed an architecture that supports mobility of hardware, data and software over the environment. Finally a sample implementation of the suggested architecture is presented. © 2005 by Knowledge Systems Institute Graduate School
Hybrid control and motion planning of dynamical legged locomotion
, Book ; Sadati, Nasser
Wiley
2012
Abstract
This book provides a comprehensive presentation of issues and challenges faced by researchers and practicing engineers in motion planning and hybrid control of dynamical legged locomotion. The major features range from offline and online motion planning algorithms to generate desired feasible periodic walking and running motions and tow-level control schemes, including within-stride feedback laws, continuous time update laws and event-based update laws, to asymptotically stabilize the generated desired periodic orbits. This book describes the current state of the art and future directions across all domains of dynamical legged locomotion so that readers can extend proposed motion planning...
Energy and delay efficient strategies for content distribution using mobile-to-mobile cooperation
, Article 6th IFIP/IEEE Wireless Days Conference, WD 2013, Valencia, 13 November 2013 through 15 November 2013 ; 2013 ; 21569711 (ISSN); 9781479905423 (ISBN) ; Salehi, M. J ; Barua, B ; Khalaj, B. H ; Katz, M ; Sharif University of Technology
IEEE Computer Society
2013
Abstract
In this paper we consider the content distribution to a set of mobile users interested in the same content. We use the concept of mobile clouds, which exploits cooperation between mobile terminals over the low-power short-range links. We propose, formulate and investigate the energy efficiency and delay of four realistic cooperative content delivery strategies. The derived results, through analysis of mathematical models and simulations, demonstrate around 65% to 95% energy saving gain in mobile cloud strategies compared to conventional multicasting. We also show that using mobile clouds, content distribution delay can be reduced for up to 85%
Let me join two worlds! analyzing the integration of web and native technologies in hybrid mobile apps
, Article Proceedings - 17th IEEE International Conference on Trust, Security and Privacy in Computing and Communications and 12th IEEE International Conference on Big Data Science and Engineering, Trustcom/BigDataSE 2018, 31 July 2018 through 3 August 2018 ; 2018 , Pages 1814-1819 ; 9781538643877 (ISBN) ; Rezaiee, M ; Chizari, A ; Sharif University of Technology
Abstract
We can notice that security problems of inappropriate integration of native and web technologies in hybrid mobile applications (apps) have been covered in the related state-of-the-art research. However, analyzing hybrid mobile apps' unique behaviors has been seldom addressed. In this paper, we explore the influence of native and web technologies integration in hybrid mobile apps on the generated profile of mobile applications. Specifically, we analyze the type of Security Sensitive APIs (SS-APIs) exposed to web content and identify the corresponding usage patterns by systematically tracking function-call-graphs of a large number of hybrid and native mobile apps. Our investigations indicate...
Mobility Prediction in Mobile Ad-Hoc Networks
, M.Sc. Thesis Sharif University of Technology ; Movaghar, Ali (Supervisor)
Abstract
Mobile ad hoc networks (MANETs) are the dynamically reconfigurable wireless networks in which mobile nodes communicate with each other without the need for any fixed infrastructure. In these networks mobile nodes are free to move, therefore, network topology changes rapidly. These changes can lead to significant performance degradations in network protocols. To cope with this, a desired solution is to predict movements of mobile nodes. In this way, we can be prepared for changes. This thesis proposes two mobility prediction methods. In both methods, each node uses the information extracted from its own history of movements to predict its future location. Results obtained by applying two...
Flopcoin: a cryptocurrency for computation offloading
, Article IEEE Transactions on Mobile Computing ; 2017 ; 15361233 (ISSN) ; Ahmadi, M ; Kosta, S ; Hui, P ; Sharif University of Technology
Abstract
During the last years, researchers have proposed solutions to help smartphones improve execution time and reduce energy consumption by offloading heavy tasks to remote entities. Lately, inspired by the promising results of message forwarding in opportunistic networks, many researchers have proposed strategies for task offloading towards nearby mobile devices, giving birth to the Device-to-Device offloading paradigm. None of these strategies, though, offers any mechanism that considers selfish users and, most importantly, that motivates and defrays the participating devices who spend their resources. In this paper, we address these problems and propose the design of a framework that...
An analytical framework for computation of throughput capacity in multi-hop mobile ad hoc networks
, Article 18th Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC'07, Athens, 3 September 2007 through 7 September 2007 ; December , 2007 ; 1424411440 (ISBN); 9781424411443 (ISBN) ; Hamdi, M ; Shafiee, K ; Sharif University of Technology
2007
Abstract
In this paper, we propose an analytical framework in order to compute the throughput capacity of a multi-hop ad hoc network with a finite number of mobile wireless nodes. The proposed framework consists of two related queueing networks; a closed BCMP queueing network to represent the mobility model of the wireless nodes and an open BCMP queueing network comprising symmetric M/G/l nodes to represent the multi-hop packet routing process from sources to destinations. In this respect, we consider very simple MAC and routing schemes and then map the related parameters onto several components of the queueing network. By solving the linear traffic equations corresponding to concerned queueing...
Design and implementation issues for mobfish
, Article 12th International Conference on Distributed Multimedia Systems, DMS 2006, 30 August 2006 through 1 September 2006 ; 2006 , Pages 17-22 ; 1891706195 (ISBN) ; Rahiman, V ; Jaberipur, G ; Noroozi, N ; Sharif University of Technology
Knowledge Systems Institute Graduate School
2006
Abstract
New advances in mobile-computer technology, together with the advent of wireless networking, introduce new requirements, capabilities and concerns to the computer science and industry. In this paper, we discuss the special requirements of file sharing in mobile environments. Then our proposed architecture for mobile file sharing (MobFish) is presented. Finally, we present an implementation of the proposed architecture based on its special design tactics. © 2006 by Knowledge Systems Institute Graduate School. All rights reserved
Mobility Pattern Recognition in Mobile Ad-Hoc Networks
, M.Sc. Thesis Sharif University of Technology ; Afshin Hemmatyar, Ali Mohammad (Supervisor)
Abstract
Mobility is one of the most challenging issues in mobile Ad-Hoc networks which has a significant impact on performance of network protocols. To cope with this issue, the protocol designers should be able to analyze the movement of mobile nodes in a particular wireless network. In this thesis, a new framework called Mobility Analyzer has been proposed. At first, Mobility Analyzer categorizes mobility models based on their mobility characteristics; subsequently, it uses mobility metrics for evaluating mobility traces which are collected by GPS or generated by mobility simulators. Finally, Mobility Analyzer recognizes the mobility model of mobility traces based on mobility metrics and measures...
Optimum hello interval for a connected homogeneous topology in mobile wireless sensor networks
, Article Telecommunication Systems ; Vol. 52, issue. 4 , April , 2013 , pp. 2475-2488 ; Online ISSN: 1572-9451 ; Sarbazi-Azad, H ; Sharif University of Technology
Abstract
Topology of a mobile wireless sensor/ad hoc network is prone to link breakages due to node mobility which compels the periodic re-construction of the topology in so called ""hello"" intervals. The problem addressed in this paper is determining the maximum ""hello"" interval preserving the connectivity of a homogeneous topology with high probability. In order to study the optimum ""hello"" interval, statistical topology lifetime (STL) is formally defined as a value of ""hello"" interval that ensures statistical connectivity with a given threshold. Temporal properties of the topology are studied based on two phenomena; one concerning a connectivity phase transition with time and the other one...
A survey of system platforms for mobile payment
, Article Proceedings - 2010 International Conference on Management of e-Commerce and e-Government, ICMeCG 2010, 23 October 2010 through 24 October 2010 ; 2010 , Pages 376-381 ; 9780769542454 (ISBN) ; Amidian, A. A ; Muhammadi, J ; Rabiee, H. R ; Sharif University of Technology
Abstract
With the evolution and significant growth in wireless technology and the development of mobile commerce, businesses can achieve superior performance through the implementation of platforms for mobile payment. However, there are several platforms for mobile payment to choose from which makes the selection of an appropriate platform for specific applications a challenging task. In response to this challenge, the most common mobile payment platforms recorded in the literature have been reviewed. This paper presents the result of this review describing the advantages and disadvantages of each system and offers ranking of the technologies considered. MCDM method is used for assessing and...
Cross layering design of IPv6 fast handover in mobile WiMAX
, Article ICT 2010: 2010 17th International Conference on Telecommunications, 4 April 2010 through 7 April 2010, Doha ; April , 2010 , Pages 304-308 ; 9781424452477 (ISBN) ; Sorooshi, M ; Sharif University of Technology
2010
Abstract
Over the past few years, rapid advances in wireless broadband networks have been driving the evolution of communication and network technologies towards new mobile services for users. Handover management is still one of the most challenging issues to be solved for seamless mobility in wireless networks. To support mobility on terminal stations mobile WiMAX has been standardized. Moreover to provide seamless communications for such network Fast Mobile IPv6 (FMIPv6) has been proposed by IETF. But for seamless handover, collaboration of layer 2 and layer 3 is required. Thus, there is a requirement for cross-layering design to support proper behavior of the MIPv6 nodes in WiMAX networks. In this...
An area-scalable human-based mobility model
, Article Computer Networks ; Volume 177 , 2020 ; Foroozani, A ; Rezaei, S ; Hemmatyar, A. M. A ; Movaghar, A ; Sharif University of Technology
Elsevier B.V
2020
Abstract
Mobile networks have been growing rapidly, where it is of paramount importance to evaluate the performance of any protocol designed for such networks before deployment. Mobility is one of the main mobile network issues that directly affects performance metrics. Since mobile nodes are often carried by their owners, nodes movement should be modeled according to humans movement. In this paper, we extend our previously published human mobility model based on real collected data. The real human movement is traced, cleaned up and analyzed. To the best of our knowledge, our collected data set is the only one that contains the detail of both walking and driving nodes. The analysis shows several...
Passwordless login system for mobile phones using CAPTCHA
, Article 49th International Symposium ELMAR-2007 focused on Mobile Multimedia, Zadar, 12 September 2007 through 14 September 2007 ; September , 2007 , Pages 243-246 ; 13342630 (ISSN); 9789537044053 (ISBN) ; Shirali Shahreza, S ; Sharif University of Technology
2007
Abstract
In last 20 years, the Internet and mobile communication growth in parallel. There are many sites specially designed for mobile phones that users must enter username and password to enter them. In this paper we introduce a new method based on CAPTCHA which does not require entering any password. Instead of entering the password, an image of a number is shown to the user and he/she must type it. The user response is coded with his/her mobile phone IMEI and sent to the server. The server checks user's response according to user's IMEI and if it was correct, let the user to enter the site, so there is no need to enter any password. This method has been implemented in PHP and J2ME languages and...
"Volume-preserving" conformational rheological models for multi-component miscible polymer blends using the GENERIC formalism
, Article Macromolecular Theory and Simulations ; Volume 12, Issue 7 , 2003 , Pages 524-530 ; 10221344 (ISSN) ; Ramazani, A ; Khonakdar, H. A ; Sharif University of Technology
2003
Abstract
A family of conformational rheological models for multi-component miscible polymer blends is developed using a modified form of the Poisson bracket formulation. Two conformation tensors called c1 and c2 are introduced to show the orientation of the first and the second components of a blend, respectively. The mobility tensor and the energy function for each blend component are expressed in terms of these conformation tensors. The interaction effects are also included by energy expressions. The predictions of this family of "volume-preserving" models are illustrated for a Hookean-type energy function and several expressions of the modified mobility tensors. The results are illustrated for...
An adaptive fuzzy logic based handoff algorithm for interworking between WLANs and mobile networks
, Article 13th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2002, Lisboa, 15 September 2002 through 18 September 2002 ; Volume 5 , 2002 , Pages 2446-2451 ; 0780375890 (ISBN); 9780780375895 (ISBN) ; Khalaj, B. H ; Sharif University of Technology
2002
Abstract
In this paper, the goal is to propose an optimal handoff algorithm for hybrid networks (HNs), which are constructed by interworking between wireless LANs (WLANs) and mobile networks. The proposed algorithm is an adaptive fuzzy logic based algorithm that can adapt itself with the dynamic conditions in HNs. It uses mobile terminal speed estimation and traffic in the WLAN as additional input parameters. This algorithm is designed to meet special requirements of HNs. The simulation results show that it has much better performance than conventional algorithms. ©2002 IEEE
Dynamic modeling and analysis of a two d.o.f. mobile manipulator
, Article Robotica ; Volume 19, Issue 2 , 2001 , Pages 177-185 ; 02635747 (ISSN) ; Meghdari, A ; Durali, M ; Sharif University of Technology
2001
Abstract
This paper presents the kinematic and dynamic modeling of a two degrees of freedom manipulator attached to a vehicle with a two degrees of freedom suspension system. The vehicle is considered to move with a constant linear speed over an irregular ground-surface while the end-effector tracks a desired trajectory in a fixed reference frame. In addition, the effects of highly coupled dynamic interaction between the manipulator and vehicle (including the suspension system's effects) have been studied. Finally, simulation results for the end-effector's straight-line trajectory are presented to illustrate these effects
Chemometrical modeling of electrophoretic mobilities in capillary electrophoresis
, Article Chemometric Methods in Capillary Electrophoresis ; 2009 , Pages 323-343 ; 9780470393291 (ISBN) ; Sharif University of Technology
John Wiley & Sons, Inc
2009
Optimum hello interval for a connected homogeneous topology in mobile wireless sensor networks
, Article Telecommunication Systems ; Volume 52, Issue 4 , 2013 , Pages 2475-2488 ; 10184864 (ISSN) ; Sarbazi Azad, H ; Sharif University of Technology
2013
Abstract
Topology of a mobile wireless sensor/ad hoc network is prone to link breakages due to node mobility which compels the periodic re-construction of the topology in so called "hello" intervals. The problem addressed in this paper is determining the maximum "hello" interval preserving the connectivity of a homogeneous topology with high probability. In order to study the optimum "hello" interval, statistical topology lifetime (STL) is formally defined as a value of "hello" interval that ensures statistical connectivity with a given threshold. Temporal properties of the topology are studied based on two phenomena; one concerning a connectivity phase transition with time and the other one...
Flopcoin: a cryptocurrency for computation offloading
, Article IEEE Transactions on Mobile Computing ; Volume 17, Issue 5 , 2018 , Pages 1062-1075 ; 15361233 (ISSN) ; Ahmadi, M ; Kosta, S ; Hui, P ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2018
Abstract
During the last years, researche'rs have proposed solutions to help smartphones improve execution time and reduce energy consumption by offloading heavy tasks to remote entities. Lately, inspired by the promising results of message forwarding in opportunistic networks, many researchers have proposed strategies for task offloading towards nearby mobile devices, giving birth to the Device-to-Device offloading paradigm. None of these strategies, though, offers any mechanism that considers selfish users and, most importantly, that motivates and defrays the participating devices who spend their resources. In this paper, we address these problems and propose the design of a framework that...