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- 저자 : ( Jihua Lu ) (검색결과 5 건)
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A Percolation based M2M Networking Architecture for Data Transmission and Routing
( Jihua Lu ),( Jianping An ),( Xiangming Li ),( Jie Yang ),( Lei Yang ) 한국인터넷정보학회 2012 KSII Transactions on Internet and Information Syst Vol.6 No.2
We propose a percolation based M2M networking architecture and its data transmission method. The proposed network architecture can be server-free and router-free, which allows us to operate routing efficiently with percolations based on six degrees of separation theory in small world network modeling. The data transmission can be divided into two phases: routing and data transmission phases. In the routing phase, probe packets will be transmitted and forwarded in the network thus multiple paths are selected and performed based on the constriction of the maximum hop number. In the second phase, the information will be encoded, say, with the fountain codes, and transmitted using the paths generated in the first phase. In such a way, an efficient routing and data transmission mechanism can be built, which allow us to construct a low-cost, flexible and ubiquitous network. Such a networking architecture and data transmission can be used in many M2M communications, such as the stub network of internet of things, and deep space networking, and so on.
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Effects of Zn Addition on Dynamic Recrystallization of High Strain Rate Rolled Al–Mg Sheets
Lu Zhao,Weijun Xia,Hongge Yan,Jihua Chen,Bin Su 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.5
Effects of Zn addition (0, 0.5, 1.0 and 1.5 wt%) on dynamic recrystallization (DRX) behavior of Al-9.2Mg alloy during highstrain rate rolling (with rolling temperature of 400 °C and strain rate of 8.6 s−1) are carefully investigated. The Zn contentplays a significant role in the enhanced DRX of Al-9.2Mg alloy. The critical strain (εc) and the peak strain (εp) are reducedfrom 0.178 ± 0.002 to 0.102 ± 0.001 and 0.211 ± 0.003 to 0.139 ± 0.002 with the Zn content increasing from 0 to 1.5%,respectively. Almost complete DRX grains are obtained in the Al-9.2Mg-0.5Zn alloy. The DRX volume fraction (FDRX), theaverage DRX grain size (AGS), the volume fraction of high-angle grain boundaries (FHAGBs) and the average grain boundaryangle (θAV) are 91.5%, 5.6 μm, 91.1% and 37.6 º, respectively. The Zn addition can enhance the formation of deformationbands (DBs) and promote the DRX process by providing the nucleation sites for new grains, while the increased dynamicprecipitates inhibit DRX. Continuous dynamic recrystallization (CDRX) is the dominant DRX mechanism, while discontinuousdynamic recrystallization (DDRX) is also existent. Effects of Zn addition on DRX process of the Al–Mg alloys canbe ascribed to the more DBs, the reduced stacking fault energy (SFE) and the dynamic precipitates.
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( Aihua Wang ),( Jihua Lu ) 한국인터넷정보학회 2011 KSII Transactions on Internet and Information Syst Vol.5 No.11
Theoretical Bit Error Rate (BER) and channel capacity analysis are always of great interest to the designers of wireless communication systems. At the center of such analyses people are often encountered with a high-dimensional multiple integrals with quite complex integrands. Conventional Gaussian quadrature is inefficient in handling problems like this, as it tends to entail tremendous computational overhead, and the principal order of its error term increase rapidly with the dimension of the integral. In this paper, we propose a new approach to calculate complex multi-fold integrals based on the number theory. In contrast to Gaussian quadrature, the proposed approach requires less computational effort, and the principal order of its error term is independent of the dimension. The effectiveness of the number theory based approach is examined in BER and capacity analyses for practical systems. In particular, the results generated by numerical computation turn out in good match with that of Monte-Carlo simulations.
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Effect of Mg Content on the Damping Behavior of Al–Mg Alloys
Zhenzhen Li,Hongge Yan,Jihua Chen,Weijun Xia,Bin Su,Lu Zhao,Min Song 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.9
This article investigated the effect of Mg content (4.5, 6.5 and 9.2, in wt%) on the damping capacities of Al–Mg alloys. The results indicate that the damping behavior can be divided into three regions. Region I refers to the low strain amplituderegion (ε < 5 × 10−5), where the damping capacity decreases with increasing the Mg content and has almost no relation withthe strain amplitude. Region II is the middle strain amplitude region (5 × 10−5 < ε < 8 × 10−4), where the damping capacityincreases rapidly with the strain. Region III refers to the high strain amplitude region (8 × 10−4 < ε < 2 × 10−3), where thedamping capacity remains constant and is independent of the strain when the strain is high enough, but increases with the Mgcontent. The damping values Q−1 of Al–4.5Mg, Al–6.5Mg and Al–9.2Mg alloys are 0.01501 ± 0.00032, 0.01633 ± 0.00032and 0.01862 ± 0.00119 at the strain of 1 × 10−3, respectively. The damping capacity in Region I is mainly determined bythe lattice distortion caused by Mg addition and the restoring force caused by pinning points and Suzuki segregation. Theextended dislocations break away from the pinning effect of Mg atoms and become moveable in Region II, and the movementof extended dislocations is the dominant damping mechanism in Region III.
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Yang Liao,Hongge Yan,Weijun Xia,Jihua Chen,Bin Su,Xinyu Li,Lu Zhao 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.4
High strain rate rolling (HSRR) is developed to improve the strength, plasticity and stress corrosion resistance of 7050 aluminumalloy simultaneously. The volume fraction of the small-angle grain boundary in the HSRRed alloy sheet is 89.9%. TEM shows that the presence of dislocations and sub-grains promotes the precipitation of the second phase. The alloy inthe T6 state has the highest strength (622 MPa) and the biggest elongation to rupture (20.6%), but poor corrosion resistance. The over-aged state shows the best corrosion resistance. The RRA state can achieve the tensile strength equivalent to T6 of614 MPa, the highest yield strength of 561 MPa and corrosion resistance comparable to the over-aged state. TEM observationshows the existence of sub-grains and dislocations plays an important role in the nucleation of the second phase. Thehigh strength can be attributed to the higher volume fraction of the precipitates, and the high plasticity can be attributed tothe higher work hardening rate. The better corrosion resistance can be ascribe to the wider precipitate-free zones at the grainboundary and the presence of the larger size second phase particles.
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