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Displaying 1-17 out of 17 total
Seamless TCP Migration on Smartphones without Network Support
Found in: IEEE Transactions on Mobile Computing
By Ahmad Rahmati,Clayton Shepard,Chad C. Tossell,Lin Zhong,Philip Kortum,Angela Nicoara,Jatinder Singh
Issue Date:March 2014
pp. 678-692
Is it possible to migrate TCP/IP flows between different networks on modern mobile devices without infrastructure support or protocol changes? To answer this question, we make three research contributions: 1) We report a comprehensive characterization of I...
 
Report of HotMobile 2010
Found in: IEEE Pervasive Computing
By Bo Han, Ahmad Rahmati, Bhojan Anand
Issue Date:July 2010
pp. 93-96
HotMobile is SIGMOBILE's highly selective, interactive workshop focused on mobile applications, systems, and environments, as well as their underlying state-of-the-art technologies. Themes from this year's workshop were mobile and urban computing, security...
 
Practical Context Awareness: Measuring and Utilizing the Context Dependency of Mobile Usage
Found in: IEEE Transactions on Mobile Computing
By Ahmad Rahmati,Clayton Shepard,Chad Tossell,Lin Zhong,Philip Kortum
Issue Date:February 2015
pp. 1
Context information brings new opportunities for efficient and effective applications and services on mobile devices. A wide range of research has exploited context dependency, i.e. the relations between context(s) and the outcome, to achieve significant, ...
 
Studying Smartphone Usage: Lessons from a Four-Month Field Study
Found in: IEEE Transactions on Mobile Computing
By Ahmad Rahmati,Lin Zhong
Issue Date:July 2013
pp. 1417-1427
Many emerging mobile applications and services are based on smartphones. We have performed a four-month field study of the adoption and usage of smartphone-based services by 14 novice teenage users. From the field study, we present the application usage an...
 
Design, Realization, and Evaluation of xShare for Impromptu Sharing of Mobile Phones
Found in: IEEE Transactions on Mobile Computing
By Yunxin Liu, Ahmad Rahmati, Hyukjae Jang, Yuanhe Huang, Lin Zhong, Yongguang Zhang, Shensheng Zhang
Issue Date:December 2010
pp. 1682-1696
Mobile phones are truly personal devices loaded with personal data such as photos, contacts, and call history. Yet it is often necessary or desirable to share our phones with others. This is especially true as mobile phones are integrating features convent...
 
Context-Based Network Estimation for Energy-Efficient Ubiquitous Wireless Connectivity
Found in: IEEE Transactions on Mobile Computing
By Ahmad Rahmati, Lin Zhong
Issue Date:January 2011
pp. 54-66
Context information brings new opportunities for efficient and effective system resource management of mobile devices. In this work, we focus on the use of context information to achieve energy-efficient, ubiquitous wireless connectivity. Our field-collect...
 
Reliability Techniques for RFID-Based Object Tracking Applications
Found in: Dependable Systems and Networks, International Conference on
By Ahmad Rahmati, Lin Zhong, Matti Hiltunen, Rittwik Jana
Issue Date:June 2007
pp. 113-118
Radio Frequency Identification (RFID) technology has the potential to dramatically improve numerous industrial practices. However, it still faces many challenges, including security and reliability, which may limit its use in many application scenarios. Wh...
 
NoShake: Content stabilization for shaking screens of mobile devices
Found in: Pervasive Computing and Communications, IEEE International Conference on
By Ahmad Rahmati, Clayton Shepard, Lin Zhong
Issue Date:March 2009
pp. 1-6
Consumer electronics and mobile devices intended for pervasive applications are often subject to shaking that makes their screen difficult to read. To address this usability challenge, we present NoShake, a system for screen content stabilization. NoShake ...
 
Data broadcasting using mobile FM radio: design, realization and application
Found in: Proceedings of the 13th international conference on Ubiquitous computing (UbiComp '11)
By Ahmad Rahmati, Ardalan Amiri Sani, Hang Yu, Jehan Wickramasuriya, Lin Zhong, Venu Vasudevan
Issue Date:September 2011
pp. 247-256
In this work, we offer a novel system, MicroStation (μStation) that allows ubiquitous data broadcasting applications using the FM radio on mobile devices such as smartphones. μStation includes two key modules to enable data broadcasting based on ...
     
Enabling pervasive mobile applications with the FM radio broadcast data system
Found in: Proceedings of the Eleventh Workshop on Mobile Computing Systems & Applications (HotMobile '10)
By Ahmad Rahmati, Daniel Stewart, Jehan Wickramasuriya, Lin Zhong, Venu Vasudevan
Issue Date:February 2010
pp. 78-83
Many existing electronic devices lack data connectivity but carry an FM radio receiver. Such devices include media players, vehicular audio systems, low-end mobile phones, and mobile phones whose owners cannot afford data plans. We observe that the highly ...
     
SaVE: sensor-assisted motion estimation for efficient h.264/AVC video encoding
Found in: Proceedings of the seventeen ACM international conference on Multimedia (MM '09)
By Ahmad Rahmati, Lin Zhong, Xiaoming Chen, Ye Wang, Zhendong Zhao
Issue Date:October 2009
pp. 381-390
Motion estimation is a key component of modern video encoding and is very compute-intensive. We present a novel Sensor-assisted Video Encoding (SaVE) method to reduce the computational complexity of motion estimation in H.264/AVC encoders, leveraging accel...
     
xShare: supporting impromptu sharing of mobile phones
Found in: Proceedings of the 7th international conference on Mobile systems, applications, and services (Mobisys '09)
By Ahmad Rahmati, Hyukjae Jang, Lin Zhong, Shensheng Zhang, Yongguang Zhang, Yuanhe Huang, Yunxin Liu
Issue Date:June 2009
pp. 1-2
Loaded with personal data, e.g. photos, contacts, and call history, mobile phones are truly personal devices. Yet it is often necessary or desirable to share our phones with others. This is especially true as mobile phones are integrating features conventi...
     
SenseCoding: accelerometer-assisted motion estimation for efficient video encoding
Found in: Proceeding of the 16th ACM international conference on Multimedia (MM '08)
By Ahmad Rahmati, Guangming Hong, Lin Zhong, Ye Wang
Issue Date:October 2008
pp. 40-42
Accelerometers have appeared on many camcorders, cameras and mobile phones. We present algorithms that estimate camera movement from accelerometer readings and apply the estimation to significantly improve the compute-intense motion estimation in video enc...
     
Usability evaluation of a commercial pocket PC phone: a pilot study
Found in: Proceedings of the 4th international conference on mobile technology, applications, and systems and the 1st international symposium on Computer human interaction in mobile technology (Mobility '07)
By Ahmad Rahmati, Lin Zhong
Issue Date:September 2007
pp. 1-2
Advanced mobile phones, such as Smartphones and Pocket PC phones, can potentially provide cost-effective ubiquitous IT access. Towards evaluating their potential and discovering their usability problems, we distributed state-of-the-art Pocket PC phones to ...
     
Understanding human-battery interaction on mobile phones
Found in: Proceedings of the 9th international conference on Human computer interaction with mobile devices and services (MobileHCI '07)
By Ahmad Rahmati, Angela Qian, Lin Zhong
Issue Date:September 2007
pp. 265-272
Mobile phone users have to deal with limited battery lifetime through a reciprocal process we call human-battery interaction (HBI). We conducted three user studies in order to understand HBI and discover the problems in existing mobile phone designs. The s...
     
Lessons learned from field trials with advanced windows mobile phones
Found in: Proceedings of the 1st international workshop on System evaluation for mobile platforms (MobiEval '07)
By Ahmad Rahmati, Lin Zhong
Issue Date:June 2007
pp. 55-55
We present CalRadio, a exible 802.11b wireless platform developed at UCSD for research and evaluation of 802.11 MAC protocols, as well as the methods we used to isolate desired field test data from undesirable factors such as interference, and possible met...
     
Context-for-wireless: context-sensitive energy-efficient wireless data transfer
Found in: Proceedings of the 5th international conference on Mobile systems, applications and services (MobiSys '07)
By Ahmad Rahmati, Lin Zhong
Issue Date:June 2007
pp. 165-178
Ubiquitous connectivity on mobile devices will enable numerous new applications in healthcare and multimedia. We set out to check how close we are towards ubiquitous connectivity in our daily life. The findings from our recent field-collected data from an ...
     
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