Abstract: Context awareness is an important part of mobile and ubiquitous computing research field. Most existing studies concentrate on the technical implementation of context awareness system. Due to the lack of understanding on human being’s awareness mechanism in a special context, there is a considerable gap between systems context awareness actions and human expectations to context awareness systems. Activity-based Context-Aware Model（ACAM） is built on the basis of activity theory and human situational awareness theories. ACAM describes human context-aware process enclosed with a specific activity, which can get more accurate understanding on human context awareness mechanism and lead the development of context-aware technology. The case study is conducted under the background of supermarket. The context awareness process of shopping activity and activity-based context awareness shopping assistant verifies the ACAM preliminary.

Key words: context awareness, activity theory, activity-based context awareness model, context awareness shopping assistant

摘要： 情境感知是移动和普适计算研究中一个重要的组成部分。现有研究大多从技术的角度进行情境感知系统的设计和实现。由于缺少对人的情境感知机制的认识，导致系统的情境感知行为和人的期望之间存在着很大的差距。在活动理论和人的情境感知理论的基础上，提出了基于活动的情境感知模型，用于描述特定活动中人的情境感知过程；并在该模型的基础上，提出了基于活动的情境感知系统交互设计方法。通过基于活动的情境感知购物助手的交互设计过程，验证了基于活动的情境感知模型在情境感知系统交互设计中的应用。

关键词: 情境感知, 活动理论, 基于活动的情境感知模型, 情境感知购物助手