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Research on Security Transmission of Perceptual Hash Values Based on ECC and Digital Watermarking
Zhang Qiuyu,Xing Pengfei,Liu Yangwei,Zhang Qianyun,Huang Yibo 보안공학연구지원센터 2015 International Journal of Security and Its Applicat Vol.9 No.3
In this paper, a secure method of transmitting perceptual hash is proposed based on error correcting codes (ECC) and digital watermarking, aiming at the fact that perceptual hash string used in audio authentication is easy to alter after been attacked in transmission and the need of extra channel. In this method we embed the binary perceptual hash values into the compressed audio as a digital watermark so that authentication data is dispersed. An ECC is used to pre-process perceptual hash sequence to ensure that speech signal with watermarking can be extracted watermarking information (the perceptual hash values) after been attacked. The experimental result illustrate that this method embeds information without influencing on the content. It is robust to noise and can prevent from common attack. At the same time, this method ensures the hearing transparency of audio perceptual content, the high efficiency of watermark extraction and the efficiency and security of algorithm.
Comment Letters and Reporting Quality: Evidence from Financial Restatements
Zhang Qiuyue,Tang Guomei,Qin Xiuting 한국증권학회 2023 Asia-Pacific Journal of Financial Studies Vol.52 No.6
This study investigates the impact of comment letter reviews on reporting quality in terms of financial restatements, using comment letters from the Chinese market between 2013 and 2020. The baseline results indicate that although receiving a comment letter increases the next year's (year t + 1) restatements, it reduces later years' (year t + 2 onwards) restatements. Moreover, this effect is more pronounced among firms with lower external auditor quality, poorer information transparency, and those located in less marketized provinces. The mechanism analyses show that comment letter reviews improve financial reporting quality because of deterrent effects in the form of increased litigation risk.
Jinlong Zhang,Jingkun Lu,Bing Liu,Qiuyue Liu,Fan Jin,Miaojun Zhang,Yerong Liu,Yujun Song,Chenhui Dong,Wanyi Zhang,Ningxu Han,Xu Deng,Feng Xing 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.S1
Quantification of viable spores is a time taking task due to the lack of rapid, efficient and accurate methods. This studypresented a simple spectrophotometric method for the detection of viable spores based on spore’s property of losing refractivityduring the germination process. By comparison of the results obtained by both spectrophotometric method and colonycounting method, a good linear correlation (R2 = 0.99) was achieved between viable spore concentration and OD loss underappropriate conditions. To avoid interference from ungerminable spores and vegetative cells, a turbidity complementationstrategy of keeping the initial concentration of spore suspensions at the same and relatively lower level was required. Thecalibration equation developed could be used to predict the viable spore yield produced in a series of fermentation experiments. The experimental results proved that this novel spectrophotometric method was sensitive, rapid, and easy to performcompared to conventional colony counting method.
Hydrogen Peroxide produced by Two Amino Acid Oxidases Mediates Antibacterial Actions
Zhang Hongmin,Yang Qiuyue,Sun Mingxuan,Teng Maikun,Niu Liwen The Microbiological Society of Korea 2004 The journal of microbiology Vol.42 No.4
The antibacterial actions of two amino acid oxidases, a D-amino acid oxidase from hog kidney and a L-amino acid oxidase from the venom of Agkistrodon halys, were investigated, demonstrating that both enzymes were able to inhibit the growth of both Gram-positive and Gram-negative bacteria, and that hydrogen peroxide, a product of their enzymatic reactions, was the antibacterial factor. However, hydrogen peroxide generated in the enzymatic reactions was not sufficient to explain the degree to which bacterial growth was inhibited. A fluorescence labeling assay showed that both of these two enzymes could bind to the surfaces of bacteria. To the best of our knowledge, this is the first report regarding the antibacterial activity of the D-amino acid oxidases.
Qiuyue Du,Song Chen,Shuo Cheng,Fengshan Du,Liang Li,Quantong Li,Limei Zhang 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.6
The integrated electric wheel module (IEWM) with large-angle steering capability is blooming which greatly alters the conventional chassis structure over recent years. The IEWM brings challenges to the suspension system due to higher requirements, which includes 360 degrees steering, active adjustment of chassis height and posture, superior ride comfort, and compact mechanical structure. Hence, a novel double trailing arm suspension mechanical system for the aforementioned IEWM and its control strategy are studied to get better driving maneuverability, ride comfort, driving safety, and posture stability of automobiles in this paper. The 6 degree of freedom (DOF) roll model of active suspension vibration with seats and multiobjective optimization controller are constructed for vehicle posture active control to solve the difficult trade-off between suspension dynamic deflection, roll angle, and seat vertical acceleration. The controller weight coefficients are optimized by an improved genetic algorithm (IGA) method, and the fitness function in piecewise form is adopted to reduce the search range. The simulation analysis shows that the combination of IGA and a multi-objective controller can defuse the conflict of goals between different suspension performance evaluation indexes, which also improves the overall suspension performances compared with the experience adjustment method and passive suspension system. In detail, this simple optimization control strategy can reduce the vertical acceleration root mean square value (RMSV) of the left and right seat by 45 % and 11 %, respectively; the left and right tire dynamic load decreased by 13 % and 2 %, respectively; and 25 % reduction in roll angle. These performance improvements only sacrifice part of suspension dynamic deflection RMSV increase, but do not affect driving safety.
Hydrogen Peroxide produced by Two Amino Acid Oxidases Mediates Antibacterial Actions
Hongmin Zhang,Qiuyue Yang,Mingxuan Sun,Maikun Teng,Liwen Niu 한국미생물학회 2004 The journal of microbiology Vol.42 No.4
The antibacterial actions of two amino acid oxidases, a D-amino acid oxidase from hog kidney and a L-amino acid oxidase from the venom of Agkistrodon halys, were investigated, demonstrating that both enzymes were able to inhibit the growth of both Gram-positive and Gram-negative bacteria, and that hydrogen peroxide, a product of their enzymatic reactions, was the antibacterial factor. However, hydrogen peroxide generated in the enzymatic reactions was not sufficient to explain the degree to which bacterial growth was inhibited. A fluorescence labeling assay showed that both of these two enzymes could bind to the surfaces of bacteria. To the best of our knowledge, this is the first report regarding the antibacterial activity of the D-amino acid oxidases.
Dezhong Yin,Wangchang Geng,Qiuyu Zhang,Baoliang Zhang 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.31 No.-
In this paper, surface-initiated atom transfer radical polymerization (SI-ATRP) on surface of Pickeringstabilizer for microencapsulation was investigated. By SI-ATRP on initiator-immobilized SiO2 particles,emulsion droplets were involved into microcapsules. The density of PMMA chains on SiO2 surfacereached 1.31 chain nm 2 and the initiator efficiency was estimated to be 28%. The results confirmed thatpolymerization was confined successfully at the interface of emulsion and 80% of polymer chains wereformed via SI-ATRP on Pickering stabilizer. This covalent between SiO2 and polymer endowed theprepared microcapsules with good durability and thermal reliability in phase change materialsapplication.
Microwave Sintering of Graphene-Nanoplatelet-Reinforced Al<sub>2</sub>O<sub>3</sub>-based Composites
Ai, Yunlong,Liu, Ying,Zhang, Qiuyu,Gong, Yuxing,He, Wen,Zhang, Jianjun The Korean Ceramic Society 2018 한국세라믹학회지 Vol.55 No.6
In this study, we performed a microwave sintering (MWS) of $Al_2O_3$ ceramic and $Al_2O_3$-based composites with nominal contents of graphene nanoplatelets (GPLs) of 0.2, 0.4, 0.6, and 0.8 vol%. The GPL dispersion in N-methyl pyrroleketone was optimized to deagglomerate the GPLs without damaging their structure. Dense composites were then obtained by MWS at $1500^{\circ}C$ for 30 min. The effects of different GPL contents on the phase compositions, microstructures, and mechanical properties of the composites were investigated. The microstructures of the composites became finer with the incorporation of the GPLs. The well-dispersed GPL fillers led to higher sintered densities in the composites. The optimal mechanical properties were achieved with 0.4 vol% GPLs. For this sample, the hardness, fracture toughness, and bending strength were $2000kgf/mm^2$, $6.19MPa{\cdot}m^{1/2}$, and 365.10 MPa, respectively. The addition of GPL could improve the microstructure of the $Al_2O_3$ ceramic and has potential to improve the fracture toughness of the ceramics.
Hui Ran,Yao Lu,Qi Zhang,Qiuyue Hu,Junmei Zhao,Kai Wang,Xuemei Tong,Qing Su 대한당뇨병학회 2021 Diabetes and Metabolism Journal Vol.45 No.3
Background: Skeletal muscle is the largest tissue in the human body, and it plays a major role in exerting force and maintaining metabolism homeostasis. The role of muscle transcription factors in the regulation of metabolism is not fully understood. MondoA is a glucose-sensing transcription factor that is highly expressed in skeletal muscle. Previous studies suggest that MondoA can influence systemic metabolism homeostasis. However, the function of MondoA in the skeletal muscle remains unclear. Methods: We generated muscle-specific MondoA knockout (MAKO) mice and analyzed the skeletal muscle morphology and glycogen content. Along with skeletal muscle from MAKO mice, C2C12 myocytes transfected with small interfering RNA against MondoA were also used to investigate the role and potential mechanism of MondoA in the development and glycogen metabolism of skeletal muscle. Results: MAKO caused muscle fiber atrophy, reduced the proportion of type II fibers compared to type I fibers, and increased the muscle glycogen level. MondoA knockdown inhibited myoblast proliferation, migration, and differentiation by inhibiting the phosphatase and tensin homolog (PTEN)/phosphoinositide 3-kinase (PI3K)/Akt pathway. Further mechanistic experiments revealed that the increased muscle glycogen in MAKO mice was caused by thioredoxin-interacting protein (TXNIP) downregulation, which led to upregulation of glucose transporter 4 (GLUT4), potentially increasing glucose uptake. Conclusion: MondoA appears to mediate mouse myofiber development, and MondoA decreases the muscle glycogen level. The findings indicate the potential function of MondoA in skeletal muscle, linking the glucose-related transcription factor to myogenesis and skeletal myofiber glycogen metabolism.