Wen-Yi Lee

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A lot of musical toys (e.g., toy guitars, toy drums and percussion) can provide a good introduction to musical instruments and give children high entertainment. Via playing an instrument toy, children can sense and practice what kinds of physical movements (e.g., fingers and/or mouths) they need to play its corresponding actual instrument to produce sounds.(More)
One of the major issues for Markowitz mean–variance model is the errors in estimations cause ''corner solutions'' and low diversity in the portfolio. In this paper, we compare the mean–variance efficiency, realized portfolio values, and diversity of the models incorporating different entropy measures by applying multiple criteria method. Differing from(More)
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