Portfolio weights solely based on risk avoid estimation errors from the sample mean, but they are still affected from the misspecification in the sample covariance matrix.To solve this problem, we shrink the covariance matrix towards the Identity, the Variance Identity, the Single-index model, the Common Covariance, the Constant Correlation, and th
Liyan Qiao,1,* Jun Lu,2,* Hongyun Huang3–5 1Department of Neurology, Tsinghua University Yuquan Hospital, 2Department of Emergency, 2nd Artillery Hospital, 3Center of Neurorestoratology, Beijing Rehabilitation Hospital, Capital Medical University, 4Beijing Hongtianji Neuroscience Academy, Beijing, 5Neuroscience Institute of Taishan Medical Un
The article proposes an Cat Beds innovative technique that allows relatively easy distinction of sand and aggregate particles on the surface image of a concrete specimen.The concept of the proposed approach involves the use of a new method of illuminating carefully polished surfaces of specimens.This is possible owing to a special attachment mounte
Nowadays, increasing research efforts are focused on the development and production of integrated devices for biomedical analysis.Besides being typically disposable, these devices should ideally be compatible with a mass-production scale and have relatively low Lecithin costs, while maintaining their biocompatibility.In this context, Additive Manuf