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In this research, we conduct a comprehensive measurement study on the predictability of human mobility with respect to demographic differences. We leverage an extensive WLAN dataset collected on a large university campus. Specifically, our dataset includes over 41 million WLAN entries gathered from over 5,000 students (with demographic information) during a four-month period in 2015. We observed surprising...
HTTP adaptive streaming (HAS) is the dominating type of video traffic in fixed and mobile networks. Although more and more mobile users stream videos over their cellular data connections, buffering is still a common problem due to fluctuating radio signal strength. We will demonstrate a new generation of context-aware HAS algorithms, which adapt video bit-rate based on location and radio information...
In mobile networks, users may lose coverage when entering a building due to the high signal attenuation at windows and walls. Under such conditions, services with minimum bit-rate requirements, such as video streaming, often show poor Quality-of-Experience (QoE). We will approach this problem in two steps. First, we present a Bayesian detector that combines measurements from two Smartphone sensors...
Understanding the mobile user flow flux patterns is important for numerous applications. Much of the mobility modeling studies have focused on a user-centric approach for outdoors movement. In this study, we take a location-centric approach for indoor mobility to analyze and characterize region relationships as pertains to user flow. Our study is trace-driven, as we use extensive measurements from...
The demand for indoor positioning and navigation is increasing exponentially in recent years. When more international students and visitors come to the university campus for study and academic activities, wireless indoor positioning and navigation by smartphones becomes a truly welcomed service. We propose a hybrid system by utilizing iBeacon within the Wi-Fi network with fingerprint technique, to...
In this paper, we propose a pedestrian navigation system based on landmark recognition. Our proposed system utilizes a glass-type wearable device and gives a correspondence between a map and a real-world landscape. By recognizing a landmark position effectively, a pedestrian can easily know where to turn at each turning position and hence he/she can reach his/her goal without losing his/her way. Experimental...
The primary purpose of this paper is to summarize the history and status of China mobile science and technology museums, as well as the trend being predicted. The method used in this paper is documentation, theoretical analysis, investigation research and case study. It is analyzed that the mobile science and technology museums are characterized in social fund using and target audience service, and...
IP Multimedia Subsystem was proposed to support the building and deployment of convergent data, voice and other innovative services over an IP-based infrastructure, independently from the device and access network in use. In this paper, we provide some guidance for engineers who design the resilience of these services. We first classify IMS-based services using several families, and study the resilience...
Recent years have witnessed an increasing need for wireless sensor networks in a wide range of applications specially for buildings automation. In such networks, many sensor nodes relay the sensed data hop by hop towards the nearest sink. The sensors closest to the sinks drain their energy much faster than distant nodes because they carry heavier traffic which causes prematurely the end of the network...
Reduction of operational efforts and complexity are key drivers for RAN Long Term Evolution. It is also of interest to minimise operational effort by introducing self-configuring and self-optimising mechanisms. A self-optimising function shall increase network performance and quality reacting to dynamic processes in the network. To improve the efficiency and performance of the E-UTRAN system, an efficiency...
Over the past 20 years, a lot of effort has gone into making the vision of ubiquitous computing a reality. A major focus of this effort has been on the understanding of human activity as input to enable the design and implementation of context-aware applications. Context-awareness is a vital enabling technology for ubiquitous virtual reality applications. However, it is only recently that we have...
In this paper, we propose Simple Frame Marker (SFM) which has a rectangular frame and encompasses a planar natural view such as characters, logos and images. In order to support recognition of characters as well as an image, Simple Frame Marker is constructed by square-type and rectangle-type markers. Therefore Simple Frame Marker first distinguishes its content by the marker type and applies a proper...
The paper develops a home security system that is equipped with RS-232, security module, appliance control module, Ethernet and mobile communication. The supervised computer can control the security module, appliance control module and small robots using RF interface. The controllers of these modules are HOLTECK chip. The user can supervised the security system using cell phone or PDA through GSM...
In this paper we propose a robust system for window detection using popular descriptive statistics and image based methods, making use of 3D information from a laser scanner. The scanner generates 3D point clouds containing intensity and distance information in a spherical coordinate system, with optional additional RGB texture information. The applied descriptive statistical method exploits basic...
We address the specification and the formal analysis of systems involving multiple facets. This leads to heterogeneous specifications that cover the different facets of these systems. A method, multifacet specification and analysis, is proposed to master the heterogeneity of systems by considering an abstract reference model that is referred to as a semantic reference for the specific models which...
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