Zobrazeno 1 - 10
of 535
pro vyhledávání: '"Wang, Xiwen"'
This paper studies the problem of learning the large-scale Gaussian graphical models that are multivariate totally positive of order two ($\text{MTP}_2$). By introducing the concept of bridge, which commonly exists in large-scale sparse graphs, we sh
Externí odkaz:
http://arxiv.org/abs/2309.13405
We tackle the network topology inference problem by utilizing Laplacian constrained Gaussian graphical models, which recast the task as estimating a precision matrix in the form of a graph Laplacian. Recent research \cite{ying2020nonconvex} has uncov
Externí odkaz:
http://arxiv.org/abs/2309.00960
The mean and variance of portfolio returns are the standard quantities to measure the expected return and risk of a portfolio. Efficient portfolios that provide optimal trade-offs between mean and variance warrant consideration. To express a preferen
Externí odkaz:
http://arxiv.org/abs/2212.06983
Development and validation of radiomics nomogram for metastatic status of epithelial ovarian cancer.
Autor:
Leng, Yinping1 (AUTHOR), Wang, Xiwen1 (AUTHOR), Zheng, Tian1 (AUTHOR), Peng, Fei1 (AUTHOR), Xiong, Liangxia1 (AUTHOR), Wang, Yu2 (AUTHOR), Gong, Lianggeng1 (AUTHOR) gong111999@126.com
Publikováno v:
Scientific Reports. 5/30/2024, Vol. 14 Issue 1, p1-11. 11p.
Since Markowitz's mean-variance framework, optimizing a portfolio that maximizes the profit and minimizes the risk has been ubiquitous in the financial industry. Initially, profit and risk were measured by the first two moments of the portfolio's ret
Externí odkaz:
http://arxiv.org/abs/2206.02412
Autor:
Adams, Colin, Capovilla-Searle, Michele, Li, Darin, Li, Lily Qiao, McErlean, Jacob, Simons, Alexander, Stewart, Natalie, Wang, Xiwen
In a variety of settings we provide a method for decomposing a 3-manifold $M$ into pieces. When the pieces have the appropriate type of hyperbolicity, then the manifold $M$ is hyperbolic and its volume is bounded below by the sum of the appropriately
Externí odkaz:
http://arxiv.org/abs/2111.06319
Autor:
Xiong, Ruiying, Guo, Jixiang, Kiyingi, Wyclif, Gao, Chenhao, Wang, Li, Luo, Junjie, Song, Hanxuan, Wang, Xiwen
Publikováno v:
In Journal of Cleaner Production 15 June 2024 458
Publikováno v:
In Heliyon 30 May 2024 10(10)
Autor:
Zhang, Ruding, Zhang, Liang, Xu, Congping, Bao, Liangxue, Zhang, Guanjun, Wang, Boliang, Wang, Xiwen, Yue, Hongjun
Publikováno v:
In Journal of Power Sources 15 September 2024 614