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This paper presents an experimental investigation on the effect of the replacement of natural coarse aggregate (NCA) with either recycled concrete aggregate (RCA) or recycled clay brick aggregate (RBA) on the compressive strengths of the hardened concrete. Two grades (C25 and C50) of concrete were investigated, which were achieved by using different water-to-cement ratios. In each grade concrete five...
Gabor feature extracted by Gabor wavelet is widely used in face recognition and proved efficiency. But the dimension of the Gabor feature vector is so high that makes it very hardly to compute and store the feature directly in practice. Some methods are proposed to reduce the dimension of Gabor feature in literature. A new method to select the key points in face image is proposed in this paper, and...
In this paper, we present a robust implementation of multi-face tracker using joint feature model, Kalman filter-based mean-shift and speeded-up robust features (SURF), which can tolerate interference caused by objects of similar color, partial occlusion, total occlusion, rotation and scale change. The joint feature model for each person combines the non-parametric distribution of colors in the face...
Eye location is an important step in face recognition. Locate eyes under various illumination conditions is also an important step especially for most of illumination normalization algorithms. In this paper, an algorithm uses a group of eigenfeature templates and Gabor feature templates to locate eye under various illumination conditions is proposed. Experiment results show that the performance of...
Reputation system is used in online markets as a trust-enforcing, deterrent, and incentive mechanism. Rating filtering mechanism is necessary in a reputation system to eliminate the impact of unfairly positive or unfairly negative ratings. The assumption that raters with low reputation are likely to give unfair ratings is not always reasonable. This paper proposes and evaluates a control theory based...
Virtual community is becoming a promising network application in the open, decentralized networks. Trust management mechanism is crucial to fertilize the development of virtual communities. After analyzing the features of virtual communities and various approaches for trust management, we present a novel bi-rating based personalized trust management model for virtual communities. We differentiate...
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