This article summarizes the design, construction and experimental results for a new wideband miniaturized antenna operating in the 1.9 GHz band. This antenna is intended for handset applications, and may also be used as an element in a larger array. Using shorting pins at the zero-potential plane, a compact antenna with a 21 percent bandwidth was designed and tested, with quite good agreement b...

Today, the mobile phone industry witnesses important changes, shifting from a value chain to a burgeoning business ecosystem. This paper deals with the relationships that are at the very core of mobile OS ecosystems for IMTs (smartphones and PDA): Microsoft-OS, Symbian-OS, Palm-OS and RIM-OS over the period 1998-2006. Our study confirms that an ecosystem’s borders are unclear. More than half of...

With the ever-increasing number of applications for mobile phones, we are more and more likely to be confronted to a problem of a separation from our environment when we look at our screen. Besides, we may seek for more discretion in the use of these applications. This is why we propose an approach, which doesn’t use the screen as the main output device. We present rich tactile feedback via an ...

Research has shown that handset selectors can be used to assist telephone-based speech/speaker recognition. Most handset selectors, however, simply select the most likely handset from a set of known handsets even for speech coming from an ‘unseen’ handset. This paper proposes a divergence-based handset selector with out-of-handset (OOH) rejection capability to identify the ‘unseen’ handsets. Th...

Android is an open operating system developed by the Open Handset Alliance (OHA) that is Google-led. Due to the nature of an open operating system, however, Android has the fragmentation problem that mobile application shows different behavior patterns in heterogeneous devices. To resolve this issue, a developer needs much cost in terms of time and efforts to devise application tests in mobile ...

In this paper we analyze a class of location disclosure in which location information from individuals is generated in an automated way, i.e. is observed by a ubiquitous infrastructure. Since such information is valuable for both scientific research and commercial use, location information might be passed on to third parties. Users are usually aware neither of the extent of the information disc...

Having a holistic view on mobile user behavior will be increasingly difficult in the future where a fragmented user base is using multiple wireless access networks. To improve understanding on user behavior and mobile service usage, traditional survey based data collection can be complemented with a range of automated measurement methods. In this paper, the alternative data collection methods a...

In this paper, we report the user research background to, the design of and eventual fate of an integrated solution to the downloading and sharing, via Bluetooth, of broadcast TV content on mobile phones. In particular, we report, first of all, the discovery of emerging social practices involving the exchange of multimedia content on mobiles that we label ‘trafficking’. Second, the iteration of...

Context dependent systems are granted thanks to the convergence of several technologies as wireless communications, Internet, geographic information systems, etc. The aim of this paper is not to analyse the optimal technical solution to this problem, but to understand the importance and perceived value for users of having this kind of services or applications in their mobile devices. In most of...