Wenfeng Shen

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Biological computations like electrocardiological modelling and simulation usually require high-performance computing environments. This paper introduces an implementation of parallel computation for computer simulation of electrocardiograms (ECGs) in a personal computer environment with an Intel CPU of Core (TM) 2 Quad Q6600 and a GPU of Geforce 8800GT,(More)
This paper presents a parallel algorithm using GPU for computer simulation of Electrocardiogram (ECG) based on a 3-dimensional (3D) whole-heart model. The computer heart model includes approximately 50,000 discrete elements (model cells) inside a torso model represented by 344 nodal points with 684 triangular meshes. After the excitation propagation is(More)
Video transcoding is an important job in video processing and network service. With the improvement of devices and the Internet, the size of the video increases rapidly so that it takes a lot of resources to transcode. Low efficiency, high cost of upgrading hardware and low capacity of processing failure are problems of the traditional method of serial(More)
Hadoop distributed file system (HDFS) is an open source software which can be used to build cloud storage system. However, HDFS does not provide any scheme to encrypt user's data. Hence, user needs to encrypt his data locally before transferring to HDFS if he requires high privacy. This paper proposes a novel method to encrypt file while being uploaded.(More)
Multi-core CPU and GPU technologies upgrades a PC to a personal supercomputer. Many algorithms have been proposed to achieve dynamic scheduling in CPU-GPU hybrid environments. Among them, only pure self-scheduling (PSS) can achieve perfect load balancing in this extremely heterogeneous environment. But PSS can not take full advantage of GPU performance,(More)
With the rise and extensive usage of Bit coin, a peer-to-peer electronic cash system beginning at 2008, the number of transactions is growing. In order to analyze the activity in this currency system, we present a parallel analysis approach for meeting the need of building the transaction graph of this financial system. In order to test the performance and(More)
Recent years have seen a rapid growth in the number of virtual machines and virtual machine images that are managed to support infrastructure as a service (IaaS). For example, Amazon Elastic Compute Cloud (EC2) has 6,521 public virtual machine images. This creates several challenges in management of image files in a cloud computing environment. In(More)
This paper proposes a simple approach for client to verify whether his/her data have been modified on the cloud storage server without downloading the data. In our approach, a number of bytes of each data block is collected to compose its metadata and stored in the cloud server along with small extra data. The approach effectively supports dynamic data(More)