It is very convenient for human to use Internet for communications. The VoIP service is a good example. Because voice transmission through Internet becomes mature, people can remotely talk with each other by IP phones inexpensively. Thus, VoIP system can be integrated with Public Switched Telephone Network (PSTN) in some groups, organizations, or companies to reduce the cost for communication. Additionally, it also can be another kind of free consultation channel for customers and users. To take advantage of VoIP system, the people who may be inside a company, be the Internet visitors, or be provisional guests can receive services and question answers immediately and freely. However, it needs a lot of procedures to connect to the VoIP system, e.g., to install a softphone which must be booted to register an VoIP server, to even configure IP address, port number, protocol, encryption, and outbound proxy, etc. This configuration sometimes is difficult and it may need to setup every time when customers want use VoIP phone. It is not an easy job for a user, for example, to download the software from Internet, and to read some documents to setup system parameters and then to operate it, especially for those people who are not familiar with computers. Thus, this inconvenience may cause VoIP service not to be easily promoted. Therefore, the purpose of this paper is to solve this problem and make users have a web interface and without worrying about how to setup the system. I combine Web interface with VoIP phone to become a ¡§webphone¡¨. To take advantage of the characteristics of generality and facility of Web, guests can click the button on the Web pages to trigger the VoIP component inside the Web page to connect to the VoIP system, then make communication with other people. At the same time, it can avoid exposing the information of server address, account, password to public and ward off dangerous attacks from Internet.

Because of the development of the Internet, there are more and more users. Various kinds of services are provided by companies. They are usually web based for easy use. The performance of web servers is a key factor of the quality of services. In a user¡¦s view, the response time is a important metric for the performance of a web server, so we implement a passive performance evaluation tool for web servers in this paper. In this paper we discussed phenomenons when bottlenecks at a web server occur. We make experiments to show how bottlenecks in the CPU, network, and in the Disk can affect the response time. The result shows that response time is affected in different way according to the type of the request when the bottleneck is CPU, network or disk.

Abstract ¡§Web GIS¡¨ is a Geographic Information Systems¡]GIS¡^ operating on the Internet. Web GIS is very popular in the world now. This 2D web GIS can¡¦t display real world spatial information in three dimension. Virtual Reality (VR) is a fancy technology, which can display real world objects in 3D and is able to walk or fly through in this virtual world. Virtual Reality Modeling Language¡]VRML¡^can be used to construct local terrain and structures in 3D on the internet. In order to use geographic coordinates in the VRML, GeoVRML was developed for GIS purposes. This research tries to integrate the tools of 2D web GIS, VRML and GeoVRML into a 3D web GIS. Concept of multi-view is used for this 3D web GIS, which combines a plan view, a model view and real view in a web page. The function of the plan view is to display 2D map and query attributes. The model view and real view are used to display 3D objects and link with database. However, the real view provides more object details in content and texture. This study tried to transform 2D polygons of the manmade structures into VRML and GeoVRML format without using specific software tools. The transformed 3D buildings are independent objects, which can link with database. The ways of creating terrain in GeoVRML are also discussed. A new node in the GeoVRML is suggested. A simple 3D spatial analysis is also explored. Finally, the campus of our university ( National Sun Yat-sen University ) was used as an example for 3D web GIS. The orthophoto of the IKONOS satellite image and 40m digital terrain model data were used. The interaction among plan view, model view and real view were also designed. A database was successfully linked with model view and real view. The calculation of 3D spatial distance between two points was demonstrated. This 3D web GIS is proved to be a 3D GIS with capabilities of 3D data display, query and 3D spatial analysis.

The Internet and web service have become the most popularly platform and application of the Client-Server model due to the universality of the network recently years. Its growth is too fast to imagine the effect, many traditional service changes into web service stage by stage, and the load of the servers become more and more heavy. In the situation the server architecture must be adapted oppositely. The web cluster architecture has the best suit of the scalability, reliability and high performance requirement, was used extensively. We have designed and implemented a mechanism termed Content-aware Distributor, which is a software module for kernel-level extension, to effectively support content-based routing. This paper is based on the achievement of the software-based Content-aware Distributor; we deliver some high repetition and fixity tasks to the hardware module, instead of the software module, to expect the hardware module could share the load of the software module and speedup the packet processing. We design and implement the hardware-based packet forwarding mechanism, by the analyze result from the software module; partition three major functions into three Engines: The Analyze Engine, which is responsible to identify and analyze the header of the packet, and decide the packet needs to be send to the upper layer or forwarded; The Lookup Engine, which is responsible to lookup the address of the table which stores the data of packet modification; and the Update Engine, used to modify the packet header as soon as possible then transfer to the send queue. We use an algorithm termed Patch to fast calculate the checksums; it causes the packet length independence modification. For the implementation, we use the Verilog HDL and EDA tools of Altera Corporation to accomplish the whole design. Simulation and evaluation the performance of processing the minimum packets, by operation at 50MHz system clock; our mechanism is faster double times than the packet receiving of two Fast Ethernet ports. From the resule we know our hardware mechanism is not only sharing the load of the upper layer, but also speedup the packet forwarding.

Advancement in high-throughput microscopy technology such as the Knife-Edge Scanning Microscopy (KESM) is enabling the production of massive amounts of high-resolution and high-quality volumetric data of biological microstructures. To fully utilize these data, they should be efficiently distributed to the scientific research community through the Internet and should be easily visualized, annotated, and analyzed. Given the volumetric nature of the data, visualizing them in 3D is important. However, since we cannot assume that every end user has high-end hardware, an approach that has minimal hardware and software requirements will be necessary, such as a standard web browser running on a typical personal computer. There are several web applications that facilitate the viewing of large collections of images. Google Maps and Google Maps-like interfaces such as Brainmaps.org allow users to pan and zoom 2D images efficiently. However, they do not yet support the rendering of volumetric data in their standard web interface. The goal of this thesis is to develop a light-weight volumetric image viewer using existing web technologies such as HTML, CSS and JavaScript while exploiting the properties of stereo vision to facilitate the viewing and annotations of volumetric data. The choice of stereogram over other techniques was made since it allows the usage of raw image stacks produced by the 3D microscope without any extra computation on the data at all. Operations to generate stereo images using 2D image stacks include distance attenuation and binocular disparity. By using HTML and JavaScript that are computationally cheap, we can accomplish both tasks dynamically in a standard web browser, by overlaying the images with intervening semi-opaque layers. The annotation framework has also been implemented and tested. In order for annotation to work in this environment, it should also be in the form of stereogram and should aid the merging of stereo pairs. The current technique allows users to place a mark (dot) on one image stack, and its projected position onto the other image stack is calculated dynamically on the client side. Other extra metadata such as textual descriptions can be entered by the user as well. To cope with the occlusion problem caused by changes in the z direction, the structure traced by the user will be displayed on the side, together with the data stacks. Using the same stereo-gram creation techniques, the traces made by the user is dynamically generated and shown as stereogram. We expect the approach presented in this thesis to be applicable to a broader scientific domain, including geology and meteorology.

Thesis (Ph.D.)--Ohio University, August, 2009. / Title from PDF t.p. Includes bibliographical references.

Thesis (Ph. D.)--University of Washington, 2000. / Vita. Includes bibliographical references (leaves 89-93).

Thèse d'exercice : Médecine. Chirurgie maxillo-faciale : Nantes : 2002. / Thèse : 2002NANT105M. Bibliogr. f. 91-98.

Rapport de stage DESS : Ingénierie documentaire : Ecole nationale supérieure des sciences de l'information et des bibliothèques, Université Claude Bernard Lyon 1 : 2002.

Rapport de stage Diplôme d'études supérieures spécialisées : Ingénierie documentaire : Villeurbanne, ENSSIB : 2003. Rapport de stage Diplôme d'études supérieures spécialisées : Ingénierie documentaire : Lyon 1 : 2003.