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In a large online advertising system, adversaries may attempt to profit from the creation of low quality or harmful advertisements. In this paper, we present a large scale data mining effort thatâ€¦ (More)

- Yunkai Zhou, Yousef Saad, Murilo L. Tiago, James R. Chelikowsky
- J. Comput. Physics
- 2006

The power of density functional theory is often limited by the high computational demand in solving an eigenvalue problem at each self-consistent-field (SCF) iteration. The method presented in thisâ€¦ (More)

- Yunkai Zhou, Yousef Saad, Murilo L. Tiago, James R. Chelikowsky
- Physical review. E, Statistical, nonlinear, andâ€¦
- 2006

Solving the Kohn-Sham eigenvalue problem constitutes the most computationally expensive part in self-consistent density functional theory (DFT) calculations. In a previous paper, we have proposed aâ€¦ (More)

- Yunkai Zhou, Yousef Saad
- Numerical Algorithms
- 2008

Stewartâ€™s Krylovâ€“Schur algorithm offers two advantages over Sorensenâ€™s implicitly restarted Arnoldi (IRA) algorithm. The first is ease of deflation of converged Ritz vectors, the second is theâ€¦ (More)

- Yunkai Zhou, Harish Sethu
- IEEE Communications Letters
- 2002

The fairness of scheduling disciplines used in communication networks has frequently been evaluated using one of two fairness measures: the absolute fairness bound (AFB) and the relative fairnessâ€¦ (More)

- Yunkai Zhou, Harish Sethu
- IEEE/ACM Transactions on Networking
- 2005

The problem of achieving fairness in the allocation of the bandwidth resource on a link shared by multiple flows of traffic has been extensively researched over the last decade. However, with theâ€¦ (More)

- Sui Ruan, Yunkai Zhou, Feili Yu, Krishna R. Pattipati, Peter Willett, Ann Patterson-Hine
- IEEE Transactions on Systems, Man, andâ€¦
- 2004

In this paper, we consider a model for the dynamic multiple-fault diagnosis (DMFD) problem arising in online monitoring of complex systems and present a solution. This problem involves real-timeâ€¦ (More)

- Yunkai Zhou, Harish Sethu
- IWQoS
- 2003

The problem of achieving fairness in the allocation of the bandwidth resource on a link shared by multiple flows of traffic has been extensively researched over the last decade. However, with theâ€¦ (More)

We revisit the two standard dense methods for matrix Sylvester and Lyapunov equations: the Bartels-Stewart method for A1X +XA2 +D = 0 and Hammarlingâ€™s method for AX + XA + BB = 0 with A stable. Weâ€¦ (More)

- Ren-Cang Li, Yunkai Zhou
- 2009

Estimating upper bounds of the spectrum of large Hermitian matrices has long been a problem with both theoretical and practical significance. Algorithms that can compute tight upper bounds withâ€¦ (More)