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188 results on '"Shi, Y. Q."'

2. Effects of Dietary Alfalfa Saponin on Digestive Physiology in Weaned Piglets.

Author

Fan, W. N., Yang, Y. X., Shi, Y. Q., Wang, C. Z., and Xu, B.

Subjects
PIGLETS, ALFALFA, PHYSIOLOGY, GASTROINTESTINAL system, SAPONINS
Abstract

Background: Saponins have been considered to affect the digestion of animal because of its relatively complex compound. Regarding the effect of saponins on animal production performance, dif ferent animals or the same animals with different physiological periods are different. The purpose of this experiment was to evaluate the effect of dietary alfalfa saponins (AS) on the digestive physiology of piglets. Methods: 72 weaned piglets (Duroc - Landrace - Large white pigs) were weaned at 28 days of age with an average weight of 7.5 kg and assigned randomly to 4 treatment groups. Diets containing 0, 0.5%, 1%, 2% alfalfa saponins were fed to piglets. Result: The results showed that: Alfalfa saponins increased daily gain and decreased diarrhea in piglets to some extent. It tended to decrease the pH value of the gastrointestinal tract and increase the pH value of the jejunum (P<0.05), ileum and cecum (P<0.05). AS had no obvious inhibitory effect on Escherichia coli, but had an increasing trend on the number of intestine Lactobacillus, especially Lactobacillus in jejunum increased significantly by adding 2% AS (P<0.05). Adding 2% alfalfa saponins can improve the digestive physiology of piglets. [ABSTRACT FROM AUTHOR]

Published
2024
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3. Detecting Double H.264 Compression Based on Analyzing Prediction Residual Distribution

Author

Chen, S., Sun, T. F., Jiang, X. H., He, P. S., Wang, S. L., Shi, Y. Q., Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Shi, Yun Qing, editor, Kim, Hyoung Joong, editor, Perez-Gonzalez, Fernando, editor, and Liu, Feng, editor

Published
2017
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6. A robust GAN-generated face detection method based on dual-color spaces and an improved Xception

Author

Chen, B. (Beijing), Liu, X. (Xin), Zheng, Y. (Yuhui), Zhao, G. (Guoying), Shi, Y.-Q. (Yun-Qing), Chen, B. (Beijing), Liu, X. (Xin), Zheng, Y. (Yuhui), Zhao, G. (Guoying), and Shi, Y.-Q. (Yun-Qing)

Abstract

In recent years, generative adversarial networks (GANs) have been widely used to generate realistic fake face images, which can easily deceive human beings. To detect these images, some methods have been proposed. However, their detection performance will be degraded greatly when the testing samples are post-processed. In this paper, some experimental studies on detecting post-processed GAN-generated face images find that (a) both the luminance component and chrominance components play an important role, and (b) the RGB and YCbCr color spaces achieve better performance than the HSV and Lab color spaces. Therefore, to enhance the robustness, both the luminance component and chrominance components of dual-color spaces (RGB and YCbCr) are considered to utilize color information effectively. In addition, the convolutional block attention module and multilayer feature aggregation module are introduced into the Xception model to enhance its feature representation power and aggregate multilayer features, respectively. Finally, a robust dual-stream network is designed by integrating dual-color spaces RGB and YCbCr and using an improved Xception model. Experimental results demonstrate that our method outperforms some existing methods, especially in its robustness against different types of post-processing operations, such as JPEG compression, Gaussian blurring, gamma correction, and median filtering.

Published
2022

22. Color image splicing localization algorithm by quaternion fully convolutional networks and superpixel-enhanced pairwise conditional random field

Author

Chen, B. (Beijing), Gao, Y. (Ye), Xu, L. (Lingzheng), Hong, X. (Xiaopeng), Zheng, Y. (Yuhui), Shi, Y.-Q. (Yun-Qing), Chen, B. (Beijing), Gao, Y. (Ye), Xu, L. (Lingzheng), Hong, X. (Xiaopeng), Zheng, Y. (Yuhui), and Shi, Y.-Q. (Yun-Qing)

Abstract

Recently, fully convolutional network (FCN) has been successfully used to locate spliced regions in synthesized images. However, all the existing FCN-based algorithms use real-valued FCN to process each channel separately. As a consequence, they fail to capture the inherent correlation between color channels and the integrity of three channels. So, in this paper, quaternion fully convolutional network (QFCN) is proposed to generalize FCN to quaternion domain by replacing real-valued conventional blocks in FCN with quaternion conventional blocks. In addition, a new color image splicing localization algorithm is proposed by combining QFCNs and superpixel (SP)-enhanced pairwise conditional random field (CRF). QFCNs consider three different versions (QFCN32, QFCN16, and QFCN8) with different up-sampling layers. The SP-enhanced pairwise CRF is used to refine the results of QFCNs. Experimental results on three publicly available datasets demonstrate that the proposed algorithm outperforms the existing algorithms including some conventional algorithms and some deep learning-based algorithms.

Published
2019

23. Optimization based on Monte Carlo simulation of a pixelated scintillator array for megavolt X-ray flash radiography.

Author

Liu, W. J., Qi, S. X., Shi, Y. Q., Chen, K., Zhang, X., Guan, Y. H., and Liu, J.

Subjects
MONTE Carlo method, SCINTILLATORS, RADIOGRAPHY, X-rays
Abstract

Pixelated scintillators arrays are widely used in X-ray radiographic applications and provide the sensitivity and resolution of detectors, which are determined by the pixel size and thickness. The design of pixelated scintillator arrays is impeded by the absence of a suitable method to simulate and predict the performance. A method of design and optimization based on a Monte Carlo simulation of a pixelated lutetium yttrium oxyorthosilicate scintillator array for MeV X-ray flash radiography has been established. The variance of the gain and spatial resolution of scintillators with different structural parameters have been studied. The proposed method was subsequently validated using flash radiographic experiments. The results of both agree well. Furthermore, the results indicate that an array with a large pixel size and small thickness exhibits strong scintillator gain, sufficient spatial resolution, and excellent uniformity of response. [ABSTRACT FROM AUTHOR]

Published
2021
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25. Controllable Four-Wave Mixing Based on Hybrid BEC-Optomechanical Systems.

Author

LIU, L. W., GENGZANG, D. J., SHI, Y. Q., CHEN, Q., WANG, X. L., and WANG, P. Y.

Subjects
FOUR-wave mixing, HYBRID systems, BOSE-Einstein condensation, PHOTON counting, OPTICAL resonators, DECAY rates (Radioactivity)
Abstract

We theoretically investigate the four-wave mixing (FWM) process based on hybrid optomechanical systems consisting of a cigar-shaped Bose-Einstein condensate (BEC), trapped inside an optical cavity with a moving endmirror. We can use a strong control field driving the cavity to control the bistable behavior of the steady-state photon number, the phonon number of the collective oscillation of the BEC and the phonon number of the mechanical resonator. Furthermore, we show how optomechanically induced transparency (OMIT) in the hybrid optomechanical systems can be used to control the four-wave mixing and enhance the intensity of the four-wave mixing. The calculated results show that the effect of the four-wave mixing can be controlled effectively by the pump strength, the frequency difference between the BEC and the moving end mirror, cavity decay rate, and effective coupling strength of the optical field with the moving mirror. Finally, the number peak of FWM can be controlled by modulating the frequency difference between the BEC and the moving end mirror and effective coupling strength of the optical field with the moving mirror. [ABSTRACT FROM AUTHOR]

Published
2019
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27. A comparison of DCT and DWT block based watermarking on medical image quality

Author

Shi, Y Q, Kim, H J, Katzenbeisser, S, Dowling, Jason, Planitz, Birgit, Maeder, Anthony, Du, Jiang, Pham, Binh, Boyd, Colin, Chen, Shaokang, Bradley, Andrew, Crozier, Stuart, Shi, Y Q, Kim, H J, Katzenbeisser, S, Dowling, Jason, Planitz, Birgit, Maeder, Anthony, Du, Jiang, Pham, Binh, Boyd, Colin, Chen, Shaokang, Bradley, Andrew, and Crozier, Stuart

Abstract

Hiding watermark information in medical image data files is one method of enhancing security and protecting patient privacy. However the research area of medical image watermarking has not been particularly active, partly due to concerns that any distortion could affect the diagnostic value of the medical image. These concerns can be addressed by ensuring that any image changes are kept below visual perception thresholds. In this paper the effects of image watermarking and common image manipulations are measured using the Peak Signal-to-Noise Ratio (PSNR), Structural Similarity Measure (SSIM) and Steerable Visual Difference Predictor (SVDP) numerical metrics. Two methods of block based watermarking are compared: the Discrete Cosine Transform (DCT) and Discrete Wavelet Transform (DWT). To ensure a fair comparison a 128-pixel block size is used which allows an identical amount of information to be embedded for each method (3072 bits multiplied by embedding strength). The results suggest that although the two methods are similar, the DCT method is preferable if localization of changes is required. If localization is not required the DWT method is supported.

Published
2008

29. A low-cost attack on branch-based software watermarking schemes

Author

Shi, Y Q, Jeon, B, Gupta, Gaurav, Pieprzyk, Josef, Shi, Y Q, Jeon, B, Gupta, Gaurav, and Pieprzyk, Josef

Abstract

In 2005, Ginger Myles and Hongxia Jin proposed a software watermarking scheme based on converting jump instructions or unconditional branch statements (UBSs) by calls to a fingerprint branch function (FBF) that computes the correct target address of the UBS as a function of the generated fingerprint and integrity check. If the program is tampered with, the fingerprint and integrity checks change and the target address will not be computed correctly. In this paper, we present an attack based on tracking stack pointer modifications to break the scheme and provide implementation details. The key element of the attack is to remove the fingerprint and integrity check generating code from the program after disassociating the target address from the fingerprint and integrity value. Using the debugging tools that give vast control to the attacker to track stack pointer operations, we perform both subtractive and watermark replacement attacks. The major steps in the attack are automated resulting in a fast and low-cost attack.

Published
2006

30. Therapeutics

Author

Azimi, A., primary, Kuznecovs, S., additional, Kuznecovs, J., additional, Blazejczyk, A., additional, Switalska, M., additional, Chlopicki, S., additional, Marcinek, A., additional, Gebicki, J., additional, Wietrzyk, J., additional, Egyhazi, S., additional, Azimi, A., additional, Ghasghgaei, S., additional, Frostvik Stolt, M., additional, Hertzman Johansson, C., additional, Hansson, J., additional, Delage, J. D., additional, Li, H., additional, Lu, H., additional, Cazin, L. H., additional, Vannier, J. P., additional, Drouet, L., additional, Dupuy, E., additional, Soria, J., additional, Varin, R., additional, Soria, C., additional, Castle, J., additional, Kreiter, S., additional, Diekmann, J., additional, Lower, M., additional, van der Roemer, N., additional, de Graaf, J., additional, Selmi, S., additional, Diken, M., additional, Boegel, S., additional, Paret, C., additional, Koslowski, M., additional, Kuhn, A. N., additional, Britten, C. M., additional, Huber, C., additional, Tureci, O., additional, Sahin, U., additional, Procopio, G., additional, Verzoni, E., additional, Testa, I., additional, de Braud, F., additional, Misale, S., additional, Yaeger, R., additional, Hobor, S., additional, Scala, E., additional, Janakiraman, M., additional, Liska, D., additional, Valtorta, E., additional, Schiavo, R., additional, Buscarino, M., additional, Siravergna, G., additional, Bencardino, K., additional, Cercek, A., additional, Chen, C., additional, Veronese, S., additional, Zanon, C., additional, Sartore-Bianchi, A., additional, Gambacorta, M., additional, Gallicchio, M., additional, Vakiani, E., additional, Boscaro, V., additional, Medico, E., additional, Weiser, M., additional, Siena, S., additional, di Nicolantonio, F., additional, Solit, D., additional, Bardelli, A., additional, Burbridge, M. F., additional, Dovat, S. P., additional, Song, C., additional, Payne, K. J., additional, Yang, L., additional, Cree, A., additional, Glaysher, M., additional, Bolton, L., additional, Johnson, P., additional, Atkey, N., additional, Torrance, C., additional, Bogush, T. A., additional, Dudko, E. A., additional, Shaturova, A. S., additional, Tikhomirov, M. V., additional, Bogush, E. A., additional, Polotsky, B. E., additional, Tjulandin, S. A., additional, Davydov, M. I., additional, Pernemalm, M., additional, Pawitan, Y., additional, Lazar, V., additional, Lundeberg, J., additional, Lehtio, J., additional, Rasul, A., additional, Ma, T., additional, Dyshlovoy, S. A., additional, Naeth, I., additional, Venz, S., additional, Fedorov, S. N., additional, Shubina, L. K., additional, Stonik, V. A., additional, Balabanov, S., additional, Honecker, F., additional, Kongpracha, P., additional, Tohtong, R., additional, Demidkina, V., additional, Kudryavtsev, V. A., additional, Kabakov, A. E., additional, Golan, T., additional, Atias, D., additional, Barshack, I., additional, Avivi, C., additional, Goldstein, R. S., additional, Berger, R., additional, Ben-Arieh, S., additional, Urban, D., additional, Maimon, N., additional, Leibowitz-Amit, R., additional, Keizman, D., additional, Biran, H., additional, Mishaeli, M., additional, Onn, A., additional, Gottfried, M., additional, Saraswati, S., additional, Agrawal, S. S., additional, Raval, P., additional, Patel, M., additional, Ganure, L., additional, Hanen, J. H., additional, Sonia, B. H. K., additional, Aya, M., additional, Zohra, H., additional, Touhami, M., additional, Cheng, X., additional, Shi, T. Y., additional, Yang, G., additional, Tu, X. Y., additional, Wu, X. H., additional, Wei, Q. Y., additional, Benboubker, H., additional, Zheng, B. Q., additional, Shi, Y. Q., additional, He, X. H., additional, Liang, L. H., additional, and Saied, G. M., additional

Published
2012
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31. Erratum

Author

Li, X-M, primary, Li, Y, additional, Zhang, N-N, additional, Xie, Y-H, additional, and Shi, Y-Q, additional

Published
2012
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