An Upper Bound of the Longest Impossible Differentials of Several Block Ciphers

( Guoyong Han ),( Wenying Zhang ),( Hongluan Zhao ) 한국인터넷정보학회 2019 KSII Transactions on Internet and Information Syst Vol.13 No.1

Impossible differential cryptanalysis is an essential cryptanalytic technique and its key point is whether there is an impossible differential path. The main factor of influencing impossible differential cryptanalysis is the length of the rounds of the impossible differential trail because the attack will be more close to the real encryption algorithm with the number becoming longer. We provide the upper bound of the longest impossible differential trails of several important block ciphers. We first analyse the national standard of the Russian Federation in 2015, Kuznyechik, which utilizes the 16-byte LFSR to achieve the linear transformation. We conclude that there is no any 3-round impossible differential trail of the Kuznyechik without the consideration of the specific S-boxes. Then we ascertain the longest impossible differential paths of several other important block ciphers by using the matrix method which can be extended to many other block ciphers. As a result, we show that, unless considering the details of the S-boxes, there is no any more than or equal to 5-round, 7-round and 9-round impossible differential paths for KLEIN, Midori64 and MIBS respectively.

Improving Recommendation Accuracy and Diversity through Cost-Awareness Probabilistic Spreading

Guoyong Cai,Dong Zhang,Yumin Lin 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.11

Recommender systems provide users with personalized suggestions for products. A key challenge is how to improve the diversity of recommendation results as much as possible, while maintaining reliably accurate suggestions. Although the bipartite graph based probabilistic spreading algorithm has its advantages of good accuracy and low computational complexity, its diversity is poor. In this paper, we introduce a cost-aware probabilistic spreading algorithm, and show how it can improve both recommendation accuracy and diversity by designing different spreading costs. Comparative experiments on widely used datasets confirm the effectiveness of the cost-aware probabilistic spreading approach in terms of accuracy, aggregate diversity and individual diversity of recommendation results. In addition, the time complexity of the proposed algorithm is also analyzed.

Spontaneous vesicle formation from trisiloxane-tailed gemini surfactant

Guoyong Wang,Zhiping Du,Dianlong Zhang,Ping Li 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4

The spontaneous vesicle formation from a novel trisiloxane-tailed gemini surfactant were reported. The surface tension measurements revealed that aggregates are formed, and dynamic light scattering (DLS) measurements suggested the aggregates are vesicles. The size and morphology were observed by transmission electron microscopy (TEM). The vesicle formation was further confirmed by dye entrapment studies.

Theoretical Research on the Time Delay and Corresponding Issues for the Novel Category of Internet of Things Control System

Yucheng Zhang,Guoyong Liu,Luming Tan 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.10

In this paper, we theoretically and numerically analyze the time delay and corresponding issues for the novel category of Internet of things control system. At present, the Internet of things technology progress and mature, people also gradually combine control system and Internet connection and make them to give full play to their strengths. Internet of things has great innovation in goods intelligent network, and the general Internet of things in the motion control system has a great development space, the future of control system is applied to the large number of the wireless fieldbus and sensor networks. To overcome the severe issues of the IOT system denoted as the time delay, we conduct research from following perspectives. (1) The control system modelling and analysis. Compared in the actual control system in an event-driven clock driver has many advantages such as when the controller equipment or setting of event-driven actuators equipment. (2) The time delay analysis with mathematical modelling. Due to the signal delay, controller cannot receive timely feedback information of the object which will seriously affect the dynamic performance of the remote control system. Complex math model is proposed to deal with the issues. In the final part, we numerically simulation the proposed model and theory compared with other famous methods, the result indicates that the proposed method obtain better performance and feasibility.

A Fault Diagnosis Method of Oil-Immersed Transformer Based on Improved Harris Hawks Optimized Random Forest

Yi Lingzhi,Jiang Ganlin,Zhang Guoyong,Yu Wenxin,Guo You,Sun Tao 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.4

In order to improve the accuracy and reliability of fault diagnosis for oil-immersed transformers, a fault diagnosis method for oil-immersed transformers based on improved Harris Hawks optimized random forest is proposed in this paper. First, logistic chaotic mapping is used to adjust the key parameters of the algorithm; then a nonlinear energy factor adjustment strategy is used to control the algorithm to transition from global search to local search; fi nally, the method of Gaussian mutation is introduced to strengthen the local search ability, and when the algorithm is stagnant, fi refl y perturbation is performed on the optimal solution to make the algorithm jump out of local optimum. The number of n_trees and n_layers of the random forest are jointly optimized by the improved Harris Hawks optimization algorithm, and the fault diagnosis model of oil-immersed transformer is established. The noncoded ratios of dissolved characteristic gases in oil are used as the characteristic input of the diagnosis model to obtain the fi nal diagnosis results. Compared with other models and verifi ed by examples, the results show that the proposed method has the advantage of high diagnostic accuracy and has certain practical engineering application value.

Surface and foam property of perfluoroalkyl polyoxyethylene ether phosphate salt in aqueous-ethanol system

Bo Ning,Yan Wang,Mi Zhang,Yanyun Bai,Xiumei Tai,Wanxu Wang,Guoyong Wang 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.94 No.-

Foam is used in manyfields with excellent performance. Moreover, disinfectants with ethanol as themain ingredient have increasingly been used in people's lives. However, the foam research of an ethanolwatermixed system is still in the initial stage. In this work, a perfluoroalkyl polyoxyethylene etherphosphate salt surfactant (FEP-Na) was synthesized through a new molecular design. The surfactant hasgood interfacial adsorption behavior in 50% ethanol-water mixing system, and the approximatelyspherical aggregates are observed in the volume phase of the solution. Moreover, FEP-Na showed goodfoaming property in 50% ethanol-water mixed solution. Interestingly, high concentration solutions withhigh surface activity have lower foam stability. And under the microscope, we see that the bubble burst isdominated by the phenomenon of coalescence. In this regard, we explain the mechanism of foamstability by electrostatic double layer theory and interfacial dilation rheology. It provides a new choice forthe synthesis of foaming agent in the ethanol-water mixed system at a concentration of 50%.

20(S)-ginsenoside Rg3 exerts anti-fi brotic effect after myocardial infarction by alleviation of fi broblasts proliferation and collagen deposition through TGFBR1 signaling pathways

Honglin Xu,Haifeng Miao,Guanghong Chen,Guoyong Zhang,Yue Hua,Yuting Wu,Tong Xu,Changlei Hu,Mingjie Pang,Leyi Tan,Xin Han,Bin Liu,Yingchun Zhou 고려인삼학회 2023 Journal of Ginseng Research Vol.47 No.6

Background: Myocardial fibrosis post-myocardial infarction (MI) can induce maladaptive cardiacremodeling as well as heart failure. Although 20(S)-ginsenoside Rg3 (Rg3) has been applied to cardiovasculardiseases, its efficacy and specific molecular mechanism in myocardial fibrosis are largely unknown. Herein, we aimed to explore whether TGFBR1 signaling was involved in Rg3's anti-fibrotic effectpost-MI. Methods: Left anterior descending (LAD) coronary artery ligation-induced MI mice and TGF-b1-stimulated primary cardiac fibroblasts (CFs) were adopted. Echocardiography, hematoxlin-eosin andMasson staining, Western-blot and immunohistochemistry, CCK8 and Edu were used to study the effectsof Rg3 on myocardial fibrosis and TGFBR1 signaling. The combination mechanism of Rg3 and TGFBR1 wasexplored by surface plasmon resonance imaging (SPRi). Moreover, myocardial Tgfbr1-deficient mice andTGFBR1 adenovirus were adopted to confirm the pharmacological mechanism of Rg3. Results: In vivo experiments, Rg3 ameliorated myocardial fibrosis and hypertrophy and enhanced cardiacfunction. Rg3-TGFBR1 had the 1.78 10 7 M equilibrium dissociation constant based on SPRi analysis,and Rg3 inhibited the activation of TGFBR1/Smads signaling dose-dependently. Cardiac-specific Tgfbr1knockdown abolished Rg3's protection against myocardial fibrosis post-MI. In addition, Rg3 downregulatedthe TGF-b1-mediated CFs growth together with collagen production in vitro through TGFBR1signaling. Moreover, TGFBR1 adenovirus partially blocked the inhibitory effect of Rg3. Conclusion: Rg3 improves myocardial fibrosis and cardiac function through suppressing CFs proliferationalong with collagen deposition by inactivation of TGFBR1 pathway.

Impact performance for high frequency hydraulic rock drill drifter with sleeve valve

Guo, Yong,Yang, Shu Yi,Liu, De Shun,Zhang, Long Yan,Chen, Jian Wen Korean Society for Fluid machinery 2016 International journal of fluid machinery and syste Vol.9 No.1

A high frequency hydraulic rock drill drifter with sleeve valve is developed to use on arm of excavator. In order to ensure optimal working parameters of impact system for the new hydraulic rock drill drifter controlled by sleeve valve, the performance test system is built using the arm and the hydraulic source of excavator. The evaluation indexes are gained through measurement of working pressure, supply oil flow and stress wave. The relations of working parameters to impact system performance are analyzed. The result demonstrates that the maximum impact energy of the drill drifter is 98.34J with impact frequency of 71HZ. Optimal pressure of YZ45 rock drill is 12.8 MPa-13.6MPa, in which the energy efficiency reaches above 58.6%, and feature moment of energy distribution is more than 0.650.

Robust Design of Main Control Valve for Hydraulic Pile Hammer Flexible Control System

Guo, Yong,Hu, Jun Ping,Zhang, Long Yan Korean Society for Fluid machinery 2016 International journal of fluid machinery and syste Vol.9 No.1

The flexible control system for hydraulic pile hammer using main control valve is present to the requirement of rapidly reversing with high frequency. To ensure the working reliability of hydraulic pile hammer, the reversing performance of the main control valve should commutate robustness to various interfere factors. Through simulation model built in Simulink/Stateflow and experiment, the effects of relative parameters to reverse performance of main control are analyzed and the main interfere factors for reversing performance are acquired. Treating reverse required time as design objects, some structure parameters as control factors, control pressure, input flow and gaps between spool and valve body as interfere factors, the robust design of the main control valve is done. The combination of factors with the strongest anti-jamming capability is acquired which ensured the reliability and anti-jamming capability of the main control valve. It also provides guidance on design and application of the main control valve used in large flow control with interferes.