Better performance has been one of the main motivations behind the recent resurgence of interest in asynchronous circuits (no matter whether this is always true or not). We are particularly interested in the performance of pipelines since they are used extensively in current digital systems. There exists an algorithm that can find the exact upper and lower bounds on the separation time of events in a certain class of process graphs. However, some transformations and complex mathematical analyses, such as graph decomposition for infinite unfolded process graphs must be employed in order to reach exact bounds. This algorithm may be a good candidate for the application of CAD tool development and circuit synthesis, but it tends to block designers from visualizing what factors really affect the performance of asynchronous circuits. In this thesis, a simple approach is adopted to approximate the performance bounds. Since our method is a symbolic approach instead of a numerical approach, it allows designers to analyze the circuit performance while providing design guidelines and approaches at the same time. Our approach has two steps. First, several basic modules are chosen, including FIFO, Fork, Join, Toggle/XOR, Arbiter/Call and Select/XOR. The individual output loop delay, equivalent input delay and equivalent output delay are derived based on the Equal loopdelay theorem. The result is a set of difference equations. The performance approximation can be obtained with simple mathematical operations on the difference equations, given the bounds of stagedelays. That is, the performance bounds of output loop delay, equivalent input delay and equivalent output delay can be represented as the bounds of stagedelays. Second, for a larger system consisting of those basic modules, its performance bounds can be derived directly from the bounds of output loop delay, equivalent input delay and equivalent output delay of those basic modules which have been obtained already. This approach allows a fast and easy calculation of performance bounds, avoiding the need to rederive the difference equations for the whole system. Both modular design and performance approximation are possible with our approach. / Graduation date: 1997

Asynchronous education activities have grown rapidly through popular distance education delivery techniques. This rapid growth has precluded science, technology, and engineering. Practice oriented disciplines have considered laboratories as key components of the curriculum. The laboratory is the difficulty of teaching such subjects through distance education. Studies have indicated that independent asynchronous study is not suitable for everyone. A qualitative study investigating two cases and utilizing a cross case analysis was performed with the goal of establishing some characteristics found in individuals who are successful, and those who are challenged by asynchronous laboratory study. Also considered were key factors which could aid or impede asynchronous laboratory studies. Case One involved a course on agricultural mechanical systems taught at a Texas four-year university with 13 participants. Case Two involved a course on electrical controls taught at the technical center of a Texas community college with 18 participants. Data were collected from observation - journaling, performance scores, and a questionnaire – interview process; then analyzed using the constant comparative method. To insure trustworthiness; credibility, transferability, and dependability were addressed. The cross-case analysis found no conflicts and reinforced the findings. The findings yielded a list of characteristics of individuals who were successful using asynchronous laboratory studies. Successes represented an elite student profile and support the suggestions of Lemckert and Florance (2002). Students were more likely to be successful when they (a) were autonomous self directed learners; (b) had a prerequisite knowledge framework; (c); had prerequisite technical skills; (d) had high reading and comprehension skills; (e) held intrinsic value for the educational experience; and (f) sought and used instructional resources. The factors discovered which aid or impede asynchronous laboratories are course design and curriculum issues. Asynchronous laboratory studies are more likely to be successful when they (a) provide a responsive system of feedback; (b) introduce study as small, step-wise experiences; (c) do not introduce independent complex concepts; (d) provide sufficient instructor time; (e) standardize computer software and applications; and (f) pilot-test and field-test laboratory equipment and activities. Conclusions drawn indicate limited applications of asynchronous laboratories for select prepared individuals with a critically designed curriculum.

Thesis (Ph. D.)--University of Florida, 2004. / Title from title page of source document. Document formatted into pages; contains 85 pages. Includes vita. Includes bibliographical references.

Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2002. / Includes bibliographical references (leaves 52-54). Also available in electronic version. Access restricted to campus users.

Yang, Jingling. / "January 2001." / Thesis (Ph.D.)--Chinese University of Hong Kong, 2001. / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Mode of access: World Wide Web. / Abstracts in English and Chinese.

ITC/USA 2007 Conference Proceedings / The Forty-Third Annual International Telemetering Conference and Technical Exhibition / October 22-25, 2007 / Riviera Hotel & Convention Center, Las Vegas, Nevada / Asynchronous JavaScript and XML (AJAX) has improved web applications in a way that has enhanced performance and made the user experience more like that of a desktop application. As the performance of PCs increases and broadband Internet access is more prevalent, switching between web pages is less painful than ever. One of the biggest advantages of AJAX is the ability for a web application to update only a small piece of data without refreshing the whole page. AJAX also allows for piecewise validation of user entry as opposed to the standard form entry with which we have become so accustomed. This paper describes how AJAX enabled applications are different from classic web applications and shows the advantages and disadvantages from both client and server sides of an AJAX enabled application. AJAX is not a new technology, but rather a new approach to web applications that uses standards already in place for XHTML, CSS, DOM, XML, and JavaScript. It is this new approach that eliminates the full page refresh that was so commonplace and now gives web applications the ability to look and feel more like desktop applications.

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