Instead of using the public switched telephone network, VoIP (Voice-over-IP) services exchange voice information over Internet. Therefore, VoIP can services with their advantage of low rates. SIP (Session Initiation Protocol) is scalable, easy to implement, and requires less setup time than its predecessor protocols. Therefore, SIP becomes one of the major signaling protocols used in VoIP. SIP uses Client-Server architecture which is simple and easy to maintain. But Client-Server architecture may cause problems while the clients increase. For the reason, IETF (The Internet Engineering Task Force) drafts discusses using P2P (Peer-to-Peer) architecture in SIP protocol to avoid the weaknesses of Client-Server architecture, and hopes to provide good voice quality by using P2P architecture. In this paper, we discuss how to design and implement an embedded P2PSIP(Peer-to-Peer Session Initiation Protocol) user agent based on SIP standard. First, we analyze all kind of the major P2P structures, and discuss the advantage and disadvantage of them. Second, our design needs to consider the embedded systems which have limited resources. Using cache is a good solution. Finally, we confront the problem and try to solve it.

Developing 3D application for low-performance embedded system often contains some limitations as hardware specifications (e.g. memory and processing efficiency). Existing OpenGL ES emulators are designed to provide the development environment for programmers, but these emulators often are lack of cross-platform performance tuning analysis for embedded systems and are only suitable for a designated hardware. In this thesis, we present an OpenGL ES emulator with performance tuning for developing 3D application of embedded systems without conforming to a specific hardware. It can further help programmers to emulate 3D application on PC for different development platforms.

Thesis (doctoral)--University of Oulu, 2000. / Includes bibliographical references. Also available on the World Wide Web.

Thesis (Ph. D.)--University of Texas at Austin, 2000. / Vita. Includes bibliographical references (leaves 94-100). Available also in a digital version from Dissertation Abstracts.

Thesis (Ph. D.)--University of Florida, 2005. / Title from title page of source document. Document formatted into pages; contains 86 pages. Includes vita. Includes bibliographical references.

Thesis (doctoral) - Universität, Konstanz, 2001. / Includes bibliographical references (p. [285]-290) and index. Also in electronic version made available by Springer.

Thesis (Ph. D.)--University of Texas at Austin, 1999. / Vita. Includes bibliographical references (leaves 116-121). Available also in a digital version from Dissertation Abstracts.

Thesis (M.S.)--Worcester Polytechnic Institute. / Includes bibliographical references (leaves 50-54).

In this dissertation, we investigate the capacity and performance of wireless networks with an emphasis on multicast traffic. The defining characteristic of a multicast network is a network where a number of different destinations all require the information generated by a single source. The models that we explore differ in the nature of the nodes from all-mobile case where all nodes are mobile to hybrid case where some nodes are mobile and some are static. We investigate different performance measure for these wireless multicast networks: upper bounds, capacity scaling laws, and achievable rates. The understanding of these measures for such networks helps in the development of efficient algorithms for operating these networks. In addition, we study the practical realization of algorithms for real-time streaming of rich multimedia content in the context of mobile wireless networks for embedded and cyberphysical systems. Our initial work is in the context of unicast and multiple unicast systems over an autonomous aerial vehicle (AAV) network. Bandwidth requirements and stringent delay constraints of real-time video streaming, paired with limitations on computational complexity and power consumptions imposed by the underlying implementation platform, make cross-layer and cross-domain co-design approaches a necessity. In this dissertation, we propose a novel, low-complexity rate-distortion optimized (RDO) protocol specifically targeted at video streaming over mobile embedded networks. First, we test the performance of our RDO algorithm on simulation models developed for aerial mobility of multiple wirelessly communicating AAVs. Second, we test the performance of our RDO algorithm and other proposed adaptive algorithms on a real network of AAVs and present a comparative study between these different algorithms. Note that generalizing these algorithms to multicast settings is relatively straightforward and thus is not highlighted to a great degree in this thesis. / text

Professional development is key to improved student and school success, however research in this field is relatively new and teacher learning is often lackluster. Additionally, alternative strategies are needed to address the unique professional development needs of experienced teachers. One possible strategy is classroom-embedded reciprocal coaching, such as that used in the National Science Foundation's GK-12 program, between experienced classroom teachers and graduate student scientists. Teachers were surveyed to determine if their participation in GK-12 provided a positive professional development experience. It was found that teachers benefited from this type of professional development with a perceived increase in their science content knowledge and an overall high level of satisfaction with the program. Interviews revealed common themes such as the teacher's viewpoint of whether this was professional development, the teachers' areas of learning, the reciprocal nature of the coaching relationship, and the prospect of sustainability. / text