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Articles by Dafang Zhang
Total Records ( 3 ) for Dafang Zhang
  Ke Qi , DaFang Zhang and Dongqing Xie
  This study presents a new high-capacity spatial steganographic scheme for 3D point cloud models using a Self-Similarity Position Matching (SSPM) procedure. The new scheme partitions the 3D point cloud model to patches, clusters patches into similarity patch chains using self-similarity measures and generates the codebook. The representative patches and similar patches are then taken from the codebook for every similar patch chain as the reference patches and the message patches. Finally, every message point in the similar message patches which has the point-to-point correspondence with a certain reference point in the reference patch can embed at least four bits using the proposed SSPM, which embeds information by shifting the message point from current point to the corresponding embedding position that is computed over virtual sphere with the reference point as the center. Experimental results show that the proposed technique is secure, has high capacity and low distortion and is robust against uniform affine transformations such as transformation, rotation, scaling. In addition, a concise shape description and a similarity measures are devoted to improving performance for forming codebook and constructing point traversal. The technique can be considered as a side-match steganography and has proven to be a feasible alternative to other steganographic schemes for 3D point cloud model.
  Jian Luo , Liu Yu , Dafang Zhang , Zhen Xia and Wei Chen
  Efficient, accurate, real-time and stable link quality estimation is essential to guarantee the upper layer protocol performance in wireless sensor network. This study expounds a new LQI-based (Based on Link Quality Indicator) link quality estimation mechanism for wireless sensor networks, which takes the lost packets and error packets into account. Based on real platform, we carry out a large number of experiments. After being analyzed the collected data, a new link evaluation model between LQI and PRR (Packet Received Ratio) is established. Experiment results have validated the correctness of the LQI-PRR model and the results also show that compared with traditional assessment methods, the mechanism proposed in this study improves the accuracy of the assessment and is more useful. At last, we analyze BER (Bit Error Ratio) and draw a relationship between LQI-PER (Packet Error Ratio), LQI-BER in order to get a further understands of the link quality.
  Wei Liang , Dafang Zhang , Zhiqiang You , Wenwei Li and Osama Hosam
  In order to reduce IP (Intellectual Property) infringements in VLSI (Very Large Scale Integration), many IP protection methods have been proposed. These methods have involved knowledge in fields of microelectronics, information hiding and embedded system. As a new field, IP protection can greatly reduce ownership misappropriation but it is faced with numerous challenges. On the basis of existing fundamental theories and engineering technologies, IP protection has rapidly developed in recent years. This study introduced IP protection in terms of concepts, characteristics and architecture. The challenges of IP protection technologies were analyzed. This study focused on the latest research improvement of IP protection technologies. The difficulties of digital watermarks on overhead, security, amounts were stated concretely. Meanwhile, this study presented some research methods for reference, such as multiple IP watermarking technology, models for watermark embedding and optimal computation, IP blind forensics technology and methods for evaluating watermark performance.
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