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| 1 | High-resolution images based on directional fusion of gradient显示文摘This paper proposes a novel method for image magnification by exploiting the property that the intensity of an image varies along the direction of the gradient very quickly. It aims to maintain sharp edges and clear details. The proposed method first calculates the gradient of the low-resolution image by fitting a surface with quadratic polynomial precision. Then,bicubic interpolation is used to obtain initial gradients of the high-resolution(HR) image. The initial gradients are readjusted to find the constrained gradients of the HR image, according to spatial correlations between gradients within a local window. To generate an HR image with high precision, a linear surface weighted by the projection length in the gradient direction is constructed. Each pixel in the HR image is determined by the linear surface. Experimental results demonstrate that our method visually improves the quality of the magnified image. It particularly avoids making jagged edges and bluring during magnification. | Liqiong Wu Yepeng Liu Brekhna Ning Liu Caiming Zhang | 2016 | Computational Visual Media2016，2，1： | 3 |
| 2 | Age-dependent decreases in DNA methyltransferase levels and low transmethylation micronutrient levels synergize to promote overexpression of genes implicated in autoimmunity and acute coronary syndromes显示文摘 | LI Yepeng LIU Ying STRICKLAND F M | 2010 | Exp Gerontol2010，45，： | 1 |
| 3 | Blockchain-Based Trusted Electronic Records Preservation in Cloud Storage显示文摘Cloud storage represents the trend of intensive,scale and specialization of information technology,which has changed the technical architecture and implementation method of electronic records management.Moreover,it will provide a convenient way to generate more advanced and efficient management of the electronic data records.However,in cloud storage environment,it is difficult to guarantee the trustworthiness of electronic records,which results in a series of severe challenges to electronic records management.Starting from the definition and specification of electronic records,this paper firstly analyzes the requirements of the trustworthiness in cloud storage during their long-term preservation according to the information security theory and subdivides the trustworthiness into the authenticity,integrity,usability,and reliability of electronic records in cloud storage.Moreover,this paper proposes the technology framework of preservation for trusted electronic records.Also,the technology of blockchain,proofs of retrievability,the open archival information system model and erasure code are adopted to protect these four security attributes,to guarantee the credibility of the electronic record. | Zhiliang Deng Yongjun Ren Yepeng Liu Xiang Yin Zixuan Shen Hye-Jin Kim | 2019 | Computers, Materials & Continua2019，，1： | 0 |
| 4 | Digital Continuity Guarantee Method of Urban Construction Archives Based on Risk Management显示文摘With the broad application of information technology in urban infrastructure,urban construction has entered the stage of a smart city,forming many electronic records in urban construction.These electronic records play a vital role in the maintenance of urban infrastructure.However,electronic records often change in the process of urban construction.How to preserve the electronic records of urban construction became a significant challenge.In response to this problem,this paper proposes the use of risk-based management techniques to ensure the digital continuity,authenticity,integrity,and availability of electronic records. | Ran Ou Fei Chen Yongjun Ren Yepeng Liu Qirun Wang | 2019 | Journal on Big Data2019，1，2： | 0 |
| 5 | The Development of Proxy Re-Encryption显示文摘With the diversification of electronic devices,cloud-based services have become the link between different devices.As a cryptosystem with secure conversion function,proxy re-encryption enables secure sharing of data in a cloud environment.Proxy re-encryption is a public key encryption system with ciphertext security conversion function.A semi-trusted agent plays the role of ciphertext conversion,which can convert the user ciphertext into the same plaintext encrypted by the principal’s public key.Proxy re-encryption has been a hotspot in the field of information security since it was proposed by Blaze et al.[Blaze,Bleumer and Strauss(1998)].After 20 years of development,proxy re-encryption has evolved into many forms been widely used.This paper elaborates on the definition,characteristics and development status of proxy re-encryption,and classifies proxy re-encryption from the perspectives of user identity,conversion condition,conversion hop count and conversion direction.The aspects of the existing program were compared and briefly reviewed from the aspects of features,performance,and security.Finally,this paper looks forward to the possible development direction of proxy re-encryption in the future. | Yepeng Liu Yongjun Ren Qirun Wang Jinyue Xia | 2020 | Journal of Cyber Security2020，2，1： | 0 |
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