We propose a Drawing-Frequency based Layered (DFL) Canvas approach to reduce a synchronization delay in collaborative web applications. The synchronization delay consists of a network delay and a drawing delay. The network delay is well-argued topic by various researches. We focus on the drawing delay, which is a primary bottleneck of Canvas objects synchronizations. We introduce the DFL Canvas approach in order to solve the drawing problem. The DFL Canvas divides Canvas objects by drawingfrequency. We implemented a collaborative paper editing support system with the DFL Canvas. Users can edit the same document and share Canvas objects on papers in real-time on web browsers. We present an evaluation result that indicates the approach is suited for collaborative paper editing support systems.

No abstract

We are developing WFE, a system for Real-Time Collaborative Editing (RTCE) for existing Web pages. We aim to enable several users to perform simultaneous modifications on existing Web pages in their browsers, while modified contents are reflected to other users in real-time. In this paper, we present the application of WFE to a cloud computing environment as well as its advantages. The environment chosen is Google App Engine, which is a platform for developing Web applications. Our comparison experiments show that we can achieve this by using push technology to perform synchronization.

No abstract

No abstract