I examine good and bad volatility spillover within the Chinese financial sector. Larger and undervalued brokerage firms are more central in propagating bad volatility to downside risks. Overvalued brokerages are central in transmitting risks from good volatility to bad volatility

I examine volatility spillover of good and bad uncertainty within the Chinese financial sector. Larger institutions are more central in the propagation of bad uncertainty. Bad uncertainty positively predicts future overall volatility

A high-frequency (HF) sky-wave radar always monitoring large area of sea surface, for detecting sea surface moving objects, there must be big data waiting to be processed. A set of data processing methods were proposed, the successful implementation of HF sky-wave radar on the sea moving target...