Chung-Hsien Tsai

Improve GPS positioning accuracy with context awareness

This paper presents an approach to calibrate GPS position by using the context awareness technique from the pervasive computing. Previous researches on GPS calibration mostly focus on the methods of integrating auxiliary hardware so that the userpsilas context information and the basic demand of the user are ignored. From the inspiration of the pervasive computing research, this paper proposes a novel approach, called PGPS (Perceptive GPS), to directly improve GPS positioning accuracy from the contextual information of received GPS data. PGPS is started with sampling received GPS data to learning carrierpsilas behavior and building a transition probability matrix based upon HMM (Hidden Markov Model) model and Newtonpsilas Laws. After constructing the required matrix, PGPS then can interactively rectify received GPS data in real time. That is, based on the transition matrix and received online GPS data, PGPS infers the behavior of GPS carrier to verify the rationality of received GPS data. If the received GPS data deviate from the inferred position, the received GPS data is then dropped. Finally, an experiment was conducted and its preliminary result shows that the proposed approach can effectively improve the accuracy of GPS position.

The next generation of GPS navigation systems

A live-view GPS navigation system ensures that a users cognitive map is consistent with the navigation map.

A wearable computing environment for the security of a large-scale factory

This paper studies the issue of using the wearable computer as a remote sensing device of a large-scale factory. The infrastructure of ubiquitous security environment to realize the remote sensing capability for the security guard is presented in this paper. This paper also scheme out a wearable computing scenario for the security guard under such a ubiquitous security environment. That is, through the help of the wearable computer, the security guard can remotely sensing the security status of each building when he is patrolling a large-scale factory. To achieve a seamless remote sensing environment, we use the wireless AP (Access Point) as the relay between static sensor networks installed inside each building and the mobile sensing device worn on the security guard. The AP enable the wearable computer to seamless receive security status of each building and upload the wearer status to the security control center at the same time. Furthermore, this research adopts the technology of embedded Linux to design a middleware for the wearable computer. The proposed architecture of the wearable computer is scalable, flexible and modular for the mobile computing system. Finally, this paper elaborates a seamless connection approach for the wearable computer within a ubiquitous security environment.

Image-Based Wearable Tangible Interface

This paper presents a novel technique for the mobile TUI system which consists of a pico projector and a camera only. The proposed system can transform an arbitrary flat surface into a touch panel. It allows user to interact with a computer by hand gestures on any flat surface in anytime and anyplace. The contributions of the proposed system include the extraction of display screen from the live captured image by a RGB-based camera, shadow-based fingertips detection approach and a fast yet reliable FSM grammar to determine user’s finger gesture. At the end, a prototype system is built to validate the proposed techniques and an experiment is shown in the last.

A 3D Campus on the Internet --- A Networked Mixed Reality Environment

This paper presents a study of networking the mobile augmented reality system with the conventional networked virtual environment and it is called the networked mixed reality environment in this study. The 3D virtual campus is an ongoing project aiming to explore the techniques how to design such a networked mixed reality environment. This study starts with investigating the temporal and spatial synchronization issues between the mobile computing system and the conventional networked virtual reality system. The proposed solutions are then followed by a demonstration prototyping system, called Multiplayer Mobile Mixed Reality(M3R) system. The tips of implementing the M3R system are presented in the end. The 3D virtual campus project successfully demonstrates the promise of building a pervasive virtual environment between the live player and the virtual player. Inspired by the preliminary success, further experiments and application are currently being examined.

A location-based service middleware for 4G LTE environment

The paper proposes a distributed middleware architecture with Location-Based Service (LBS) features in a 4G LTE telecom environment to effectively facilitate the interaction between location-based data producers and consumers as well as to reduce the required backbone bandwidth by location-based service. The proposed distributed middleware architecture could not only upgrade the original 4G LTE base station with extra value but also allow each base station to become a data dispatcher of the district within its service signal coverage. The proposed system fully utilized the capabilities of Message Orient Middleware(MOM) to provide LBS within 4G LTE environments. A prototype of the proposed system is implemented and is discussed in this paper.

Interaction Wearable Computer with Networked Virtual Environment

The goal of this research is to propose a technique to integrate the mobile reality system into the legacy networked virtual environment. This research composes of two essential research domains, one is networked virtual environment (NVE) and the other is mobile computing. With the proposed technique, a user can use a mobile device to join a networked virtual environment and interact with desktop users of the same virtual environment. To achieve this goal, three technical issues have to be solved including mobile networking, resource-shortage and coordinates coordination. The paper presents solutions to all of these issues. Further, a Mobility Supporting Server (MSS) is proposed to implement presented solutions into an existing networked virtual environment, called 3D virtual campus, Taiwan. The result of this experimental research enlightens the possibility of building a Multiplayer Mobile Mixed Reality (M3R) environment in the near future.

Use of the analytical system as the decision support system for the HLA joint training environment

This paper proposes an approach to join the analytical system to the real-time operational war game system. The interoperability issues of these two heterogeneous war game systems are fully explored in this paper. The purpose of interoperability among heterogeneous systems is to extend the capability of the joint systems beyond their originally designed purposes. This paper starts with the purpose of interoperability to categorize the types of the heterogeneous joint simulation. The technical issue and architecture of the heterogeneous joint simulation environment are then explored. Our experiment shows that the proposed method of using the analytical system as the decision support system is feasible and efficient approach to provide a heterogeneous joint training environment

Research of Place-based 3D Augmented Community-Taking The 3D Virtual Campus as an Example

Place-based virtual community is the trend of recent researches on pervasive computing. The purpose is to enable users in a physical place to receive ubiquitous services from the environment while they communicate with each other unwittingly. The paper further promotes this idea by allowing remote users to join such a virtual community as well as to interact with members on site and calls this type of community as the place-based 3D augmented (PDA) community. With the help of the augmented reality technique, on-the-spot member can visually sense the remote users by their representing avatars. To achieve this goal, the ambient communication environment is required to support message flow among the remote users and people on site. Besides, this environment should be able to discover context passing among members of this community to provide proper services. The context issues and context-awareness approaches of PDA community are fully discussed in the paper. Finally, the infrastructure of this PDA community is also presented along with preliminary result of the prototyping environment.

Portality - The portal between virtuality and reality

This paper proposes an innovative concept of community, called Mirror Reality, which is formed by the seamless interaction between users of physical space and virtual world. The Mirror Reality is relying on a portal to achieve the data translation and communication between virtual and reality worlds. This study employs the Ontology technology to analyze unified representation of objects and events in both virtual world and physical space. Furthermore, the research issues of creating a Mirror Reality are also identified. The portal that is implemented from the analysis is called Portality to emphasize its role between virtuality and reality. In other words, Portality takes care all of the data conversion and processing to permit the interoperability between two totally different worlds. Finally, the prototype of Mirror Reality for the university campus with its Portality is illustrated at the end.