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RISS 인기검색어
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- 저자 : Xiaonan Hu (검색결과 5 건)
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Integrate Advantage of Geographic Routing and Reactive Mechanism for Aeronautical Ad Hoc Networks
Xiaoheng Tan,Xiaonan Hu,Pengfei Qu,Zhengnan Zhu,Yan Zhang 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.7
Large scale range and high dynamic topology are the two major features of Aeronautical Ad Hoc Networks (AANETs), which present severe challenges to provide efficient and reliable data packet delivery in aviation communication networks. Geographic routing has been studied as an attractive option for routing in aeronautical networks due to its simplicity and scalability. However there are still some problems such as low packet delivery ratio and less reliability for long dynamic links. In this paper, we improve the greedy forwarding strategy and start with the idea of integrating reactive routing mechanism with geographic routing protocol, referred to as IRG (Improved Reactive and Geographic) routing protocol. Variety simulations have been performed to evaluate the performance of the proposed routing protocol, and the results show that it can increase the packet delivery ratio efficiently.
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Xiaming Chen,Xiaonan Wang,Pengchen Huan,Zengrong Hu,Zhikang Wu,Bo Zhang,Hiromi Nagaumi 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.2
The difference in droplet transfer behavior between the traditional cold metal transfer plus pulse (CMT + P) process and thenew CMT mix synchro-pulse (CMT + SP) process, and its effect on the overall morphology, porosity, microstructure andmechanical properties of WAAM-ed AA2219 alloy are studied. Compared to the pulse stage (fP = 160 Hz) of the traditionalCMT + P process, the pulse stage of CMT + SP process consists of the low-frequency pulse and high-frequency pulse (HFP)stages. The high frequency (fH = 200 Hz) of the HFP stages formed a high arc force, enlarging the molten pool and enhancingthe convection of molten pool. This increased the melting depth between passes and facilitated the flow of the moltenpool to the sides and escaping of the pores. As a result, a highly symmetric WAAM-ed AA2219 alloy with a high effectiveheight (14.2 mm) and effective area (89.6 mm2),and low porosity (0.6 ± 0.2%) was manufactured by the CMT + SP process. Moreover, the fine grains (61 μm) with a 43% (area fraction) equiaxed grains were obtained with the CMT + SP process,leading to more θ′ phases precipitating. Thus, the average microhardness and tensile strength of the CMT + SP samplesincreased to 80.2 ± 6.7 HV and 265.0 ± 17.0 MPa, respectively.
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Longitudinal Dynamic Response of Pile Foundation in a Nonuniform Initial Strain Field
Xiaojun Tian,Wentao Hu,Xiaonan Gong 대한토목학회 2015 KSCE JOURNAL OF CIVIL ENGINEERING Vol.19 No.6
This paper presents an investigation into the dynamic response of pile and soil due to pile installation in a radially inhomogeneous initial strain field. The radial variation rule for the shear modulus and physical parameters of the soil caused by the initial strain field is deduced. On the basis of the plane strain and complete P-S (pile-soil) contact assumptions, the analytical solution of longitudinal dynamic impedance of the soil is derived by means of subdividing the soil domain into a number of annular vertical zones. The longitudinal impedance of the pile top and velocity response in frequency and time domains, are also obtained. The parametric study of interfacial pressure on the dynamic response of P-S system is undertaken within a relatively lower frequency domain. Comparison results between previous solutions and the present study indicates that the analytical solution derived in this paper is more stable.
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GROWTH AND MICROSTRUCTURES OF ULTRATHIN Bi 2 Te 3 NANOPLATES BY MODIFIED HOT WALL EPITAXY
JIANHUA GUO,HUIYONG DENG,YUCONG LIU,GUJIN HU,XIAONAN LI,GUOLIN YU,NING DAI 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.6
Ultrathin Bi 2 Te 3 nanoplates have been grown on an oxidized silicon substrate by a modi¯ed hotwall epitaxy (HWE) method, in which a quartz plate with holes was employed. The micro-structures and optical properties of Bi 2 Te 3 nanoplates were investigated by X-ray di®raction(XRD), scanning electron microscopy (SEM), atomic force microscope (AFM) and micro-Ramanspectroscopy. The results show that ultrathin Bi 2 Te 3 nanoplates with the thickness of about sixquintuple layers (QLs) are obtained, which is di±cult for the traditional HWE technique. TheRaman vibration mode A11gfrom the nanoplates exhibits an obviously red shift with decreasingthickness. The thickness variation of one nanoplate was obtained by the Raman map derivedfrom the vibration frequency of A11gmode and is in good agreement with the AFM result, whichindicates that Raman map is an e®ective method to characterize the thickness di®erence ofultrathin Bi 2 Te 3 nanoplates.
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An Unambiguous Deterministic Compressed Acquisition Technique for BOC Signal
Xiaoheng Tan,Yan Zhang,Qiang Yan,Tingting Pan,Xiaonan Hu 보안공학연구지원센터 2015 International Journal of Signal Processing, Image Vol.8 No.9
The long PN code in a Binary Offset Carrier (BOC) modulated signal has a higher rate than the GPS C/A code, which makes the acquisition process in the new global navigation satellite system (GNSS) much more complex. To achieve a fast acquisition of the GNSS signal with a reduced number of correlators and low computational complexity, a two-stage deterministic compressed (DS) GNSS acquisition technique has been proposed. Nevertheless, the ambiguous threat of BOC signal isn’t taken into account in the DS technique. To eliminate the ambiguity threat in the acquisition process of BOC (m, n) signal, an unambiguous deterministic compressed acquisition is proposed in this paper. The main idea of the proposed technique is to introduce a simplified GRASS algorithm in the second stage measurement. Theoretical analysis and simulation results show that, at the expense of some performance degradation the proposed technique can completely remove the undesired positive side peaks of BOC (m, n) signal, and reduce the chance of false peak acquisition compared with the DS technique.
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