Wenbo Chang

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Segmentation for images with intensity inhomogeneity is very difficult. In this paper, a fuzzy clustering-based method to segment intensity inhomogeneity images is presented. Firstly, a new expression of the fuzzy C-means(FCM) object function is derived through altering the prototype of every clustering to a point-wise function. Then, a weight function(More)
In 2003, a new law required that 40 percent of Norwegian firms' directors be women – at the time only nine percent of directors were women. We use the pre-quota cross-sectional variation in female board representation to instrument for exogenous changes to corporate boards following the quota. We find that the constraint imposed by the quota caused a(More)
We investigate the relationship between board structure and firm value using a large-scale natural experiment to overcome endogeneity problems. In 2003, a new law required that 40 percent of Norwegian firms' directors be women – at the time only nine percent of directors were women. The constraint imposed by the law resulted in a significantly negative(More)
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