research on user-centered design and recognition pen gestures

Pen-based user interface has become a hot research field in recent years. Pen gesture plays an important role in Pen-based user interfaces. But it’s difficult for UI designers to design, and for users to learn and use. In this purpose, we performed a research on user-centered design and recognition pen gestures. We performed a survey of 100 pen gestures in twelve famous pen-bases systems to find problems of pen gestures currently used. And we conducted a questionnaire to evaluate the matching degree between commands and pen gestures to discover the characteristics that a good pen gestures should have. Then cognition theories were applied to analyze the advantages of those characteristics in helping improving the learnability of pen gestures. From these, we analyzed the pen gesture recognition effect and presented some improvements on features selection in recognition algorithm of pen gestures. Finally we used a couple of psychology experiments to evaluate twelve pen gestures designed based on the research. It shows those gestures is better for user to learn and use. Research results of this paper can be used for designer as a primary principle to design pen gestures in pen-based systems.

基于邮件预取策略的嵌入式邮件客户端设计与实现

互联网时代嵌入式产品的发展对嵌入式软件技术提出了新的挑战,如何增强嵌入式设备的网络通讯能力已经越来越成为人们关心的问题.作为一种重要的网络通讯软件,嵌入式邮件客户端已经成为了众多嵌入式产品的关键应用之一.该文介绍了一种基于邮件预取策略的嵌入式邮件客户端.与传统的嵌入式邮件客户端不同,笔者引入了一种新的邮件接收策略,通过跟踪用户的历史行为,优先接收用户感兴趣的邮件,从而提高了嵌入式邮件客户端在不稳定、低速的网络环境下的使用效率.