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RISS 인기검색어
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- 저자 : Shiqiang Zhu (검색결과 3 건)
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Integral Attacks on Some Lightweight Block Ciphers
( Shiqiang Zhu ),( Gaoli Wang ),( Yu He ),( Haifeng Qian ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.11
At EUROCRYPT 2015, Todo proposed a new technique named division property, and it is a powerful technique to find integral distinguishers. The original division property is also named word-based division property. Later, Todo and Morii once again proposed a new technique named the bit-based division property at FSE 2016 and find more rounds integral distinguisher for SIMON-32. There are two basic approaches currently being adopted in researches under the bit-based division property. One is conventional bit-based division property (CBDP), the other is bit-based division property using three-subset (BDPT). Particularly, BDPT is more powerful than CBDP. In this paper, we use Boolean Satisfiability Problem (SAT)-aided cryptanalysis to search integral distinguishers. We conduct experiments on SIMON-32/-48/-64/-96, SIMON (102)-32/-48/-64, SIMECK-32/-48/-64, LBlock, GIFT and Khudra to prove the efficiency of our method. For SIMON (102)-32/-48/-64, we can determine some bits are odd, while these bits can only be determined as constant in the previous result. For GIFT, more balanced (zero-sum) bits can be found. For LBlock, we can find some other new integral distinguishers. For Khudra, we obtain two 9-round integral distinguishers. For other ciphers, we can find the same integral distinguishers as before.
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Novel Inverse Kinematic Approaches for Robot Manipulators with Pieper-criterion based Geometry
Huashan Liu,Yang Zhang,Shiqiang Zhu 제어·로봇·시스템학회 2015 International Journal of Control, Automation, and Vol.13 No.5
In this paper, the inverse kinematics (IK) for robot manipulators with Pieper-Criterion based geometry is investigated from a novel perspective. Different from the traditional inverse transformation method, properties on orthogonal matrix, dot product operation and block matrix are synthetically involved in the proposed schemes to help simplify the IK solving, where the IK matrix equations are transformed into pure algebraic equations without any complex calculations of the inverses for transformation matrices. In the meantime, the linear combinations of related equations in the IK solving ensure the solutions free of extraneous roots, which enhances the computational efficiency further. Moreover, the singularity problem is fully addressed for a specific robot manipulator of such kind. Finally, experimental tests are provided to verify the proposed IK schemes.
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Shaogan Ye,Junhui Zhang,Bing Xu,Wei Song,Long Chen,Haiyong Shi,Shiqiang Zhu 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.9
Erosion damage affects the reliability and durability of axial piston pumps. An axial piston pump was tested using endurance life testing method. The phenomenon of erosion damage on the valve plate was observed using a confocal laser scanning microscope, by comparing the surface on the valve plate before and after the endurance life testing. A CFD turbulence model inclusive of the cavitation effects was developed to predict the flow physics. The flow physics in the axial piston pump were presented and analyzed, including the fluid velocities, velocity fields, the total volume fraction fields of gas and vapor, and pressure fields. Two causes of erosion damage were found, the appearances of large amount of vapor, and directly hitting by the jetting flow. The first one is the cause of erosion damage on the surface near the transition region from the inlet port to the outlet port, and the second one is the cause of erosion damage on the surface near the transition region from the outlet port to the inlet port. Besides, the findings show that the fluid velocities closely relate to the area of erosion damage. The study provides insights into the occurrence of erosion damage in axial piston pumps.
ScienceON
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