Ching-Sheng Wang

Intuitional 3D Museum Navigation System Using Kinect

Most of the museum navigation systems lack the function of user interaction. Even the small number of systems with user interaction functions, but required special and expensive devices, or may use non-intuitional operation methods. This paper used popular and economic Microsoft Kinect devices to establish an interactive 3D museum navigation system that supports intuitional commands. The users are allowed to intuitively control the 3D navigation system by physical motions and voice commands without wearing any additional appliances. The experiments show that the proposed system improves the effect of navigation satisfactorily.

RFID-based and Kinect-based indoor positioning system

The research of indoor positioning is rapidly increasing in recent years, and most researchers have focused on RFID technology in indoor positioning; It is difficult to deal with the RFID positioning method, due to RFID is restricted by the disturbance of wireless signals. Therefore, this paper proposes an indoor location system combined with active RFID and Kinect. Based on the identification and positioning functions of RFID, and the effective object extraction ability of Kinect, our system can analyze the identification and position of persons accurately and effectively.

Location-Based P2P Mobile Navigation System

In recent years, location-based services have received increased attention, with many developed practical applications for GPS, such as traffic navigation, travel guides, album maps, etc. This study developed a P2P mobile navigation system that supports both indoor and outdoor positioning. When a user walks indoor or outdoor exhibition areas with mobile navigation equipment, this system can indicate the position of the user, and the location-based P2P clustering mechanism enables the user to download relevant 3D scenes and multimedia information in P2P mode from nearby peers with the same navigation interest, thus, navigation data transmission efficiency is effectively increased.

Real-Time Data Delivery Using Prediction Mechanism in Mobile Environments

Mobile data delivery is a critical issue in the mobile computing area. One of the most important problems is the efficient access to data. A proposed solution to this problem is the prefetching technique which consists in putting in reserving the information before the users need it. Low bandwidth, unreliable wireless links, and frequent disconnections of mobile environments make it difficult to satisfy the timing requirements of traditional strategies. This paper investigates broadcast scheduling strategies for push-based broadcast with timing constraints in the form of deadlines ,and proposes a prediction algorithm based on Kalman filter theory for this study. The proposed dissemination policy and adaptive bandwidth allocation scheme obtain sufficient conditions such that all the time-bounded traffic sources satisfy their timing constraints to provide various quality of service guarantees in the broadcast period. Our goal is to identify scheduling algorithms for broadcast systems that ensure requests meeting their deadlines. Our approach examines the performance of traditional real-time strategies and mobile broadcasting strategies, and demonstrates that traditional real-time algorithms do not always perform the best in mobile environments. The proposed design indeed achieves good performance in mobile environments.

Flexible Localization and Identification System Based on RFID and Vision Tracking Technologies

Among existing indoor localization systems, considering the costs and accuracy, RFID has been one of the best choices for indoor positioning. However, years of research experiences found that the signal strength of RFID is not sufficiently stable and sensitive to the indoor environment and furniture, which reduce positioning accuracy. Therefore, this paper proposed an indoor localization and identification system, bases on active RFID and vision tracking technologies. This system has a more flexible RFID triangular layout method and a more efficient sensing overlap analysis mechanism. By integrating the precise positioning information of video images, the proposed system not only reduces the costs, but also improves the computing efficiency and positioning accuracy.

Scheduling Management for Multiple Real-Time Data over On-Demand Mobile Environments

Many time-constraint applications operate on continuous queries and need real-time data services in on-demand mobile environments. Providing deadline guarantees for queries over dynamic multiple data is a challenging problem due to continuous query rates and time-varying contents. The accurately approximated optimum distributions is used to obtain analytical expressions for performance metrics such as average real-time miss rate and outage probability. The normal probability distribution function of client request to channel hopping is approximated. In the analysis multiple channel model based on currently transmitting is considered over independent and not identically distributed wireless channels. In addition the performance of currently transmitting is compared with the QoS-based management scheme for real-time query processing. The numerical results are validated by linear programming simulations. It is shown that for broadcasting real-time data placement, this contribution is very useful and efficient for exact performance analysis and design of wireless multi-channel links.

P2P-based mobile navigation system with location service

With the many practical applications involving global positioning system (GPS) that have been developed to date, location-based services have been receiving increased attention. Mobile users of a mobile navigation system want to retrieve useful or interesting information when they are located in the same area as such points of interest. However, such a system will be overloaded if the number of mobile users increases significantly. Therefore, this study developed a mobile navigation system based on the peer-to-peer (P2P) protocol that supports indoor and outdoor locations. The system enables a mobile user to download multimedia data from nearby users with similar interests. The experiment results show that multimedia data are efficiently transmitted by P2P in the system.

An Augmented Reality Mobile Navigation System Integrating Indoor Localization and Recommendation Mechanism

Several well-known museums and researchers have developed mobile navigation systems to improve the navigation effect. But most of those systems are lack of efficient recommendation and indoor localization function. This situation causes the difficulty for visitors to have an overview and a flexible navigating experience. In this paper, an augmented reality mobile navigation system that supports indoor localization and real-time recommendation service is proposed. It aims at providing personalized suggestions corresponded to user’s context through the analysis of interest and location information of visitors. In addition, accompanied by the augmented reality display function, this system provides diversified 3D and multimedia navigation information, so as to enrich and improve user’s navigation experience effectively.

A Real-Time Indoor Positioning System Based on RFID and Kinect

Global navigation satellite system is fully well developed in outdoor positioning nowadays; however, it cannot be applied in indoor positioning. The research of indoor positioning is rapidly increasing in recent years, and most researchers have paid much attention to RFID technology in indoor positioning; however, RFID is restricted by hardware characteristics and the disturbance of wireless signals. It is difficult to deal with the RFID positioning method. Therefore, this paper proposed an indoor real-time location system combined with active RFID and Kinect. Based on the identification and positioning functions of RFID, and the effective object extraction ability of Kinect, the proposed system can analyze the identification and position of persons accurately and effectively.

Intuitive Projection Display System Supporting the Manipulation of Dual Laser Pens

The combined use of computers and projectors in delivering multimedia presentations and in teaching is very common. However, the common operating tools used to deliver presentations such as presentation pens or mice either have limited manipulation functionality or are less convenient, and it is difficult to perform functions such as zooming, rotating images, and writing. In addition to allowing users to move freely in space to remotely perform functions, the laser pen manipulation system proposed in this paper can also perform the writing functions of a laser pen. Moreover, the system can also support the simultaneous use of two laser pens to realize a touch mode similar to that of a tablet computer, thus achieving an intuitive projection display manipulation experience.