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In this paper, we propose a new concept called subject-keyphrase and also introduce a method to extract subject-keyphrases from a document. Subject-keyphrases refer to the words or phrases used to represent the sentence subjects of a document, i.e., the content of a document is organized around the subjects of the document. It can be expected that each sentence of a document is composed of a subject...
A spectral shaping technique is adopted to expand the operating frequency range for DWT-based blind audio watermarking. The process is performed framewisely over the 3rd level approximation subband, of which the spectrum spans from 0 to 2756 Hz. The effectiveness of the proposed scheme is demonstrated using the perceptual evaluation of audio quality and bit error rates of recovered watermarks under...
Next-generation sequencing (NGS) data are a rapidly growing example of big data and a source of new knowledge in science. However, sequencing errors remain unavoidable and reduce the quality of NGS data. Error correction, therefore, is a critical step in the successful utilization of NGS data, including de novo genome assembly and DNA resequencing. Since NGS throughput doubles approximately every...
A novel progressive QIM technique is developed to cooperate with the SVD-based watermarking scheme in the DWT domain. The progressive structure in quantization step sizes not only allows the exploitation of human visual characteristics but provides the clues of the ground level of brightness. A particle swarm optimization method is adopted to identify the ground level prior to performing watermark...
The MapReduce framework has become the de facto choice for big data analysis in a variety of applications. In MapReduce programming model, computation is distributed to a cluster of computing nodes that runs in parallel. The performance of a MapReduce application is thus affected by system and middleware, characteristics of data, and design and implementation of the algorithms. In this study, we focus...
Next-generation sequencing (NGS) technologies produce huge amounts of data. These sequencing data unavoidably are accompanied by the occurrence of sequencing errors which constitutes one of the major problems of further analyses. Error correction is indeed one of the critical steps to the success of NGS applications such as de novo genome assembly and DNA resequencing as illustrated in literature...
The next-generation sequencing technologies dramatically accelerate the throughput of DNA sequencing in a much faster rate than the growth rate of computer speed as predicted by the ¡§Moore¡¦s Law.¡¨ It is a problem even to load and run these sequencing data in memory. There is an urgent need for de novo assemblers to efficiently handle the huge amount of sequencing data using scalable commodity servers...
A novel, practical and low-complexity multi-cell OFDMA downlink channel assignment method using a graph- based approach is proposed in this work. The inter-cell interference (ICI) information is obtained through inference from the diversity set of mobile stations (MSs) and presented in the form of an interference graph. The proposed downlink channel assignment method consists of two phases. The task...
The delay analysis and comparison of OFDM- TDMA and OFDMA using a flow control scheme under the QoS framework of IEEE 802.16 are conducted in this work. We investigate the maximum packet delay performance by deriving delay bounds for several multiaccess modes with different subcarrier/time-slot assignment and bit allocation schemes. The analytical delay bounds provide insights into the performance...
Performance comparison of multiuser OFDM-TDMA and OFDMA systems by considering physical and link cross-layer behavior is conducted in this work. We provide a new framework for performance evaluation that centers on "scheduling" with several different subcarrier/bit allocation schemes. The performance metrics include: the bit rate, the bit error rate (BER), packet throughput and delay. The...
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