关键词: 网格计算经济, 信任, 上下文, 欧几里德近似法, 激励

Abstract: Lack of reliable trust evaluation mechanism prevents resources from the comprehensive sharing in grid computing economy.Based on grid computing economy model，a trust model with controlled evaluation is presented，in which trust context is introduced and corresponding incentive and punishment mechanism is put forward.With the estimation of context similarity，the model effectively estimates trust degrees of strange entities.Simulation shows that the model outperforms the existing trust evaluation model，and can well solve the reliable trust evaluation problem of grid entity，decrease the influence of strange entities’ pseudo services on trust evaluation models.

Key words: grid computing economy, trust, context, Euclid approximation, incentive