Wenyao Zhang

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Pitch period is a key parameter in speech compression, synthesis and recognition. The AMDF is often used to determine this parameter. Due to the falling trend of the AMDF curve, however, it is easy to make the estimated pitch doubled or halved To correct these errors, the algoritlun has to increase its complexity. In this paper, we propose a new function,(More)
Recent cost analysis shows that the server cost still dominates the total cost of high-scale data centers or cloud systems. In this paper, we argue for a new twist on the classical resource provisioning problem: heterogeneous workloads are a fact of life in large-scale data centers, and current resource provisioning solutions do not act upon this(More)
Streamline is an important way to visualize flow fields. In this paper, we propose a new streamline placement method. This method seeds streamlines at the centers of sub-fields that are enclosed by existing streamlines or field boundaries. When a streamline is seeded in a sub-field, the sub-field is generally partitioned into one or more small ones. We then(More)
In robot visual servo the system performance has a close relationship with image features. This paper mainly discusses two kinds of image features. One is geometrical moments, and the other is eigen-space transform features, which can be regarded as a kind of overall image features. Using overall features may avoid designing artificial marks on the objects,(More)
Parallel streamline placement is still an open problem in flow visualization. In this paper, we propose an innovative method to place streamlines in parallel for 2D flow fields. This method is based on our proposed concept of local tracing areas (LTAs). An LTA is defined as a subdomain enclosed by streamlines and/or field borders, where the tracing of(More)