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| 1 | Pseudo-noise preamble based joint frame and frequency synchronization algorithm in OFDM communication systems显示文摘Frame and frequency synchronization are essential for orthogonal frequency division multiplexing(OFDM) systems. The frame offset owing to incorrect start point position of the fast Fourier transform(FFT) window, and the carrier frequency offset(CFO) due to Doppler frequency shift or the frequency mismatch between the transmitter and receiver oscillators, can bring severe intersymbol interference(ISI) and intercarrier interference(ICI) for the OFDM system. Relying on the relatively good correlation characteristic of the pseudonoise(PN) sequence, a joint frame offset and normalized CFO estimation algorithm based on PN preamble in time domain is developed to realize the frame and frequency synchronization in the OFDM system. By comparison, the performances of the traditional algorithm and the improved algorithm are simulated under different conditions. The results indicate that the PN preamble based algorithm both in frame offset estimation and CFO estimation is more accurate, resourcesaving and robust even under poor channel condition, such as low signaltonoise ratio(SNR) and large normalized CFO. | Qingfeng Jing Ming Cheng Yuping Lu Weizhi Zhong Hongwei Yao | 2014 | Journal of Systems Engineering and Electronics2014，25，1： | 4 |
| 2 | Numerical modeling of SiC by low-pressure chemical vapor deposition from methyltrichlorosilane显示文摘The development of functional relationships between the observed deposition rate and the experimental conditions is an important step toward understanding and optimizing low-pressure chemical vapor deposition(LPCVD)or low-pressure chemical vapor infiltration(LPCVI).In the field of ceramic matrix composites(CMCs),methyltrichlorosilane(CH3 SiCl3,MTS)is the most widely used source gas system for SiC,because stoichiometric SiC deposit can be facilitated at 900°C–1300°C.However,the reliability and accuracy of existing numerical models for these processing conditions are rarely reported.In this study,a comprehensive transport model was coupled with gas-phase and surface kinetics.The resulting gas-phase kinetics was confirmed via the measured concentration of gaseous species.The relationship between deposition rate and 24 gaseous species has been effectively evaluated by combining the special superiority of the novel extreme machine learning method and the conventional sticking coefficient method.Surface kinetics were then proposed and shown to reproduce the experimental results.The proposed simulation strategy can be used for different material systems. | Kang Guan Yong Gao Qingfeng Zeng Xingang Luan Yi Zhang Laifei Cheng Jianqing Wu Zhenya Lu | 2020 | Chinese Journal of Chemical Engineering2020，28，6： | 3 |
| 3 | Qualitative Analysis of Gene Regulatory Networks Based on Angular Discretization显示文摘 | WANG Xuesong LIU Qingfeng CHENG Yuhu LI Lijing | 2011 | Chinese Journal of Electronics2011，20，4： | 2 |
| 4 | Structural, elastic and electronic properties of transition metal carbides TMC (TM=Ti, Zr, Hf and Ta) from first-principles calculations显示文摘 | Hui Li Litong Zhang Qingfeng Zeng Kang Guan Kaiyuan Li Haitao Ren Shanhua Liu Laifei Cheng | 2011 | Solid State Communications2011，，8： | 1 |
| 5 | Analysis of Nitrosamines Migration from Condoms in the Chinese Market Using a Proper Migration Experiment显示文摘 | Di Feng Qingfeng Zhou Xuelian Cheng Jiedong Wang Quanli Yang | 2010 | Bulletin of Environmental Contamination and Toxicology2010，，4： | 1 |
| 6 | Detection and toxicity assessment of nitrosamines migration from latex gloves in the Chinese market显示文摘 | Di Feng Huiping Wang Xuelian Cheng Jiedong Wang Lifeng Ning Qingfeng Zhou Yue Zhou Quanli Yang | 2009 | International Journal of Hygiene and Environmental Health2009，，5： | 1 |
| 7 | Characterization and flocculation mechanism of a bioflocculant from hydrolyzate of rice stover显示文摘 | Junyuan Guo Jing Yu Xin Xin Changwu Zou Qingfeng Cheng Huaijin Yang Lichao Nengzi | 2014 | Bioresource Technology2014，，： | 1 |
| 8 | Hot-top direct chill casting assisted by a twin-cooling field:Improving the ingot quality of a large-size 2024 Al alloy显示文摘Microstructure inhomogeneity and negative segregation have long been challenges for large-size alloy ingots,directly affecting the downstream processing and final performance of products.Here,we used2024 aluminum alloy as a model alloy to propose a technique,named double-cooling field casting,i.e.,one 2024 Al alloy rod(Φ20 mm)at room temperature was introduced into the melt along the central axis of the hot-top with the protection of a thermal-insulation tube during the direct chill(DC)casting process of aΦ300 mm 2024 Al alloy ingot.The results show that the introduction of the same alloy solid insert has a remarkable influence on refining grains in the center region of the ingot,reducing negative centerline segregation and decreasing the depth of the center part of the sump.With the application of the 2024 Al insert,the mean size of equiaxed grains at the center part of the ingot decreased from1204±132μm to 721±69μm.The relative deviation of the Cu and Mg main solutes reduced from-0.062 and-0.054 to-0.03 and-0.024,respectively,and the sump depth decreased from 280 mm to242 mm.Moreover,the shape of the solidification front was changed from‘V’-shaped to‘W’-shaped.The ingot quality was thus improved,mainly arising from the dissolution of the cold 2024 Al insert at a proper position of the hot-top counteracting some latent heat of solidification of the ingot,dissipating the heat of the central part of the hot-top by conducting the 2024 Al insert to the outside,and providing extra-nuclei from the unmoltenα-Al particles of the insert. | Cheng Zhu Zhihao Zhao Qingfeng Zhu Gaosong Wang Yubo Zuo Qiangqiang Li Gaowu Qin | 2022 | Journal of Materials Science & Technology2022，，17： | 1 |
| 9 | A secure spectrum auction scheme without the trusted party based on the smart contract显示文摘With the development of communication 5G networks and technologies,spectrum resources are increasingly scarce.The scarcity of the spectrum resource makes market-driven spectrum auction become an important means of spectrum allocation,and due to the complexity of the network environment,the security of spectrum auctions can not be ignored.Most existing secure spectrum auction schemes introduce a semi-honest agent to complete spectrum auction.However,the hypothetical semi-honest model does not guarantee the security of spectnim auction in the actual application scenario,which may lead to potential security threats:the agent may reveal the privacy of bidders,agent or auctioneer may collude with the bidder to manipulate the spectrum auction,and so on.In this paper,a secure spectrum auction scheme without a trusted party is proposed based on the smart contract technology,and the smart contract written into the blockchain replaces the traditional semi-honest agent to cooperate with the auctioneer server to complete the auction.In order to ensure the security of our scheme,a secure spectrum auction protocol is designed,in which the Software Guard Extensions(SGX)technology and Paillier cryptosystem are used to protect the privacy of bidders.Public verification is provided in our protocol by using extensive Pedersen commitment,which prevents the auctioneer server and the bidder from colluding with each other and verifies group bid sum values.Finally,the security analysis is given to propose several types of attacks that can be defended.Besides,theoretical analysis and simulation experiments of our protocol are also provided. | Jiaqi Wang Ning Lu Qingfeng Cheng Lu Zhou Wenbo Shi | 2021 | Digital Communications and Networks2021，7，2： | 1 |
| 10 | Missing Value Estimation for Gene Expression Profile Data显示文摘 | WANG Xuesong LIU Qingfeng CHENG Yuhu | 2012 | Chinese Journal of Electronics2012，21，4： | 1 |
| 11 | Identifying miRNA-disease association based on integrating miRNA topological similarity and functional similarity显示文摘Background:MicroRNAs(miRNAs)are a significant type of non-coding RNAs,which usually were encoded by endogenous genes with about?22 nt nucleotides.Accumulating biological experiments have shown that miRNAs have close associations with various human diseases.Although traditional experimental methods achieve great successes in miRNA-disease interaction identification,these methods also have some limitations.Therefore,it is necessary to develop computational method to predict miRNA-disease interactions.Methods:Here,we propose a computational framework(MDVSI)to predict interactions between miRNAs and diseases by integrating miRNA topological similarity and functional similarity.Firstly,the CosRA index is utilized to measure miRNA similarity based on network topological feature.Then,in order to enhance the reliability of miRNA similarity,the functional similarity and CosRA similarity are integrated based on linear weight method.Further,the potential miRNA-disease associations are predicted by using recommendation method.In addition,in order to overcome limitation of recommendation method,for new disease,a new strategy is proposed to predict potential interactions between miRNAs and new disease based on disease functional similarity.Results:To evaluate the performance of different methods,we conduct ten-fold cross validation and de novo test in experiment and compare MDVSI with two the-state-of-art methods.The experimental result shows that MDVSI achieves an AUC of 0.91,which is at least 0.012 higher than other compared methods.Conclusions:In summary,we propose a computational framework(MDSVI)for miRNA-disease interaction prediction.The experiment results demonstrate that it outperforms other the-state-of^the-art methods.Case study shows that it can effectively identify potential miRNA-disease interactions. | Qingfeng Chen Zhao Zhe Wei Lan Ruchang Zhang Zhiqiang Wang Cheng Luo Yi-Ping Pheobe Chen | 2019 | Quantitative Biology2019，7，3： | 1 |
| 12 | Numerical simulation for fabrication of C/SiC composites in isothermal CVI reactor显示文摘 | Xi Wei Laifei Cheng Litong Zhang Yongdong Xu Qingfeng Zeng | 2006 | Computational Materials Science2006，，2： | 1 |
| 13 | Charge disproportionation induced exchange bias in La_(0.5)Ca_(0.5)FeO_(3-δ)显示文摘We observed an exchange bias effect in La0.5Ca0.5FeO3 perovskite compound.The exchange bias is associated with the charge disproportionation transition from Fe4+ions to Fe3+and Fe5+ions below 175 K.The competition between the ferromagnetic interaction of Fe3+and Fe5+ions and the antiferromagnetic one of Fe3+and Fe3+ions results in a unidirectional anisotropy in the cluster-glass system.An antiferromagnetically interfacial exchange coupling constant Ji1.95 meV at the cluster-glass region was yielded by fitting the cooling field-dependence of the exchange bias field. | LIANG YaQiong ZHANG XiangQun JIN JinLing ZHAN QingFeng CHENG ZhaoHua | 2013 | Science China(Physics,Mechanics & Astronomy)2013，56，11： | 1 |
| 14 | Chiral AuCu heterostructures with site-specific geometric control and tailored plasmonic chirality显示文摘Rational design and construction of chiral-achiral hybrid structures are of great importance to realize the multifunctional complex chiral structures toward emerging technological applications. However, significant challenges remain due to the lack of fine control over the heterostructure. Here, we have developed a general bottom-up synthetic strategy for the site-selective growth of Cu nanodomains on intrinsically chiral Au nanocrystals. Chiral AuCu heterostructures with three distinct architectures were achieved by controlling the overgrowth of Cu nanodomains in a site-specific manner. The geometry-dependent plasmonic chirality of the heterostructures was demonstrated experimentally by circular dichroism spectroscopy and theoretically through finite-difference time-domain simulations. The site-specific geometric control of chiral AuCu heterostructures was also extended to employ anisotropic chiral Au nanoplates and nanorods as the building blocks. By virtue of the galvanic replacement reactions between metal ions and Cu atoms, chiral heterostructures with increasing architectural complexity and compositional diversity can be further achieved. The current work not only opens up a promising strategy to synthesize complex chiral hybrid nanostructures but also provides an important knowledge framework that guides the rational design of multifunctional chiral hybrid nanostructures toward chiroptical applications. | Guizeng Yang Lichao Sun Yunlong Tao Qingqing Cheng Xuehao Sun Chuang Liu Qingfeng Zhang | 2023 | Science China Chemistry2023，66，11： | 0 |
| 15 | Ice-volume and insolation influences on hydroclimate changes in central eastern China during the antepenultimate glacial period显示文摘The rainfall changes in East Asian summer monsoon(EASM)regions on the orbital timescale remain controversial due to the lack of reliable rainfall records.Here,we present new multiproxy records(δ^(18)O,δ^(13)C,Sr/Ca and Mg/Ca)of a230Thdated stalagmite from Hulu Cave in central eastern China.Multiproxy records reconstruct a regional hydroclimate history from 340 to 261 kyr BP(thousand years before present),approximately covering the antepenultimate glacial period.Theδ^(18)O record is dominated by the precessional cycles,suggesting that EASM responds to changes in Northern Hemisphere summer insolation(NHSI)on the orbital timescale.Significant correlations amongst theδ^(13)C,Sr/Ca and Mg/Ca suggest that a common factor,i.e.,the local hydrological cycle,controlled their variability,and their leading principal component can be used as a proxy linked to regional rainfall.This composite record bears a good similarity to those from the Chinese Loess Plateau,showing a gradually decreasing rainfall during the antepenultimate glacial period,consistent with changes in global ice volume.Superimposed on the long-term trend,three relative wetter intervals were responding to the higher NHSI periods,suggesting that EASM rainfall variability was induced by integrated effects of global ice volume and NHSI.The increased ice sheets and lower NHSI resulted in an increased meridional temperature gradient and southward shift of the westerlies,which shortened the duration of Meiyu and midsummer rainfall.The differences between the rainfall record and the stalagmiteδ^(18)O record indicate that the latter represents the overall EASM intensity linked to monsoon circulation,but does not directly reflect the rainfall changes at the cave sites. | Quan WANG Shayue YUAN Yijia LIANG Kan ZHAO Qingfeng SHAO Zhenqiu ZHANG Junji ZHU Xinggong KONG Yongjin WANG Jianghu LAN Hai CHENG Chengwei XIA Yi LI | 2023 | Science China Earth Sciences2023，66，1： | 0 |
| 16 | Improvement on a batch authenticated key agreement scheme显示文摘The rapid advancement in 5G networks calls for more key technologies to support.To promote its wide deployment and application,ultra-dense network(UDN)plays a significant part by providing high data rate and realizing seamless coverage and low delay.There have proposed many related works on 5G UDN,such as the literatures[1,2].However,UDN still faces some security challenges.For instance,it needs to guarantee the reliable and continuous connection and provide communication security. | Qingfeng CHENG Ting CHEN Siqi MA Xinghua LI | 2022 | Frontiers of Computer Science2022，16，2： | 0 |
| 17 | An enhanced key exchange protocol exhibiting key compromise impersonation attacks resistance in mobile commerce environment显示文摘Dear editor,Numerous three-party authenticated key exchange(3PAKE)protocols have been presented, which allow the establishment of a secure session by utilizing a session key shared between two clients with the assistance of a server trusted by both the clients via an unprotected network communication environment. The 3PAKE protocols can be applied to various scenarios, including mobile commerce environment. | Ting CHEN Xinghua LI Qingfeng CHENG | 2021 | Science China(Information Sciences)2021，64，9： | 0 |
| 18 | An Image Steganography Algorithm Based on Quantization Index Modulation Resisting Scaling Attacks and Statistical Detection显示文摘In view of the fact that the current adaptive steganography algorithms are difficult to resist scaling attacks and that a method resisting scaling attack is only for the nearest neighbor interpolation method,this paper proposes an image steganography algorithm based on quantization index modulation resisting both scaling attacks and statistical detection.For the spatial image,this paper uses the watermarking algorithm based on quantization index modulation to extract the embedded domain.Then construct the embedding distortion function of the new embedded domain based on S-UNIWARD steganography,and use the minimum distortion coding to realize the embedding of the secret messages.Finally,according to the embedding modification amplitude of secret messages in the new embedded domain,the quantization index modulation algorithm is applied to realize the final embedding of secret messages in the original embedded domain.The experimental results show that the algorithm proposed is robust to the three common interpolation attacks including the nearest neighbor interpolation,the bilinear interpolation and the bicubic interpolation.And the average correct extraction rate of embedded messages increases from 50%to over 93% after 0.5 times-fold scaling attack using the bicubic interpolation method,compared with the classical steganography algorithm S-UNIWARD.Also the algorithm proposed has higher detection resistance than the original watermarking algorithm based on quantization index modulation. | Yue Zhang Dengpan Ye Junjun Gan Zhenyu Li Qingfeng Cheng | 2018 | Computers, Materials & Continua2018，，7： | 0 |
| 19 | A fine-grained privacy protection data aggregation scheme for outsourcing smart grid显示文摘Compared with the traditional power grid,smart grid involves many advanced technologies and applications.However,due to the rapid development of various network technologies,smart grid is facing the challenges of balancing privacy,security,efficiency,and functionality.In the proposed scheme,we design a privacy protection scheme for outsourcing smart grid aided by fog computing,which supports fine-grained privacy-protected data aggregation based on user characteristics.The fog server matches the encrypted characteristics in the received message with the encrypted aggregation rules issued by the service provider.Therefore,the service provider can get more fine-grained analysis data based on user characteristics.Different from the existing outsourcing smart grid schemes,the proposed scheme can achieve real-time pricing on the premise of protecting user privacy and achieving system fault tolerance.Finally,experiment analyses demonstrate that the proposed scheme has less computation overhead and lower transmission delay than existing schemes. | Hongyang LI Xinghua LI Qingfeng CHENG | 2023 | Frontiers of Computer Science2023，17，3： | 0 |
| 20 | Cause Analysis and Treatment Measures for Leakage of Top Cover of 330kV GIS Equipment显示文摘Based on the experience of GIS equipment maintenance, the causes of air leakage defects of GIS equipment running in a 330 substation were analyzed. After the equipment was disassembled, the main causes of air leakage were found, and a series of improvement measures were taken to eliminate the GIS equipment leakage defect. And the effective and feasible advice was put forward for this type of air leakage problem. The results lay a foundation for the safe and stable operation of GIS equipment. | MIN Haibin CHENG Hao ZHANG Hao ZENG Qingfeng LUO Xiangyang | 2019 | International Journal of Plant Engineering and Management2019，24，4： | 0 |
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