An important issue in location management for dealing with user mobility in wireless networks is to reduce the cost associated with location updates and searches. The former operation occurs when a mobile user moves to a new location registration area and the network is being informed of the mobile user's current location; the latter operation occurs when there is a call for the mobile user and...

This paper suggests a new way for nonholonomic mobile robots to navigate in obstacle environments using potential fields based on navigation functions. The proposed strategy is a time-invariant feedback control design with the distinguishing feature that it requires almost no switching compared to alternative methodologies of the same nature. Asymptotic convergence with collision avoidance for ...

In this paper, a realistic simulation model for Wheeled Mobile Robot (WMR) is given by a dynamical system that switches between three models corresponding to three different tire/road contact conditions: ideal condition, skidding condition and slipping condition. Then, an algebraic based numerical identification for the discrete state (tire/road contact condition) of this switching system is pr...

BACKGROUND The development of a mobile telephone food record has the potential to ameliorate much of the burden associated with current methods of dietary assessment. When using the mobile telephone food record, respondents capture an image of their foods and beverages before and after eating. Methods of image analysis and volume estimation allow for automatic identification and volume estimati...

Recently, a lot of mobile phone users are rapidly switching to smartphones, and, many users download mobile applications without any thought of security. Therefore, smartphones are interesting target for malware, especially with Android devices. So, it is too important to use a methodology to detect the malware applications before installing it on the phones. In this paper we propose an effecti...

This research-in-progress paper examines how to facilitate in-car use of multi-context mobile services such as mobile telephone calls, e-mail, news, and SMS. Because the car is a mobile context with specific convenience and safety problems, it is important to identify and explore seamless ways to use in-car resources such as dashboard control buttons, in-car audio systems, and in-car displays f...

In the paper we study parallel key exchange among multiple parties. The status of parallel key exchange can be depicted by a key graph. In a key graph, a vertex represents a party and an edge represents a relation of two parties who are to share a key. We first propose a security model for a key graph, which extends the Bellare-Rogaway model for two-party key exchange. Next, we clarify the rela...

Smart Antennas are being regarded by many as the key solution to increasing the spectral efficiency and improving the system performance in mobile communication. In principle, an antenna is smart only when it can recognize and track the signal of a particular mobile telephone while suppressing interfering signals. This can be achieved by forming a beam towards the mobile telephone, hence, the t...

How did we arrive at our current state of tHe art? Pre-Cellular Mobile Telephony In order to understand where we're going, we need to understand how we arrived at today's state of the art. The notion of reliable mobile telephone service was first introduced in the 1950's. The first widely deployed system was developed by AT&T Bell Laboratories in the United States and referred to as Mobile Tele...

introduction: the mobile phone is viewed as an important communication tool and has become an integral part of the iranian society and they are increasingly using the mobile phone rather than the fixed line telephone as a way to keep in touch with their family, friends, colleagues and business associates. today, mobile phones are equipped with other features that allow further communication and...