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Wei, Jun,Quintero, Russ,Galati, Nestore,Nanni, Antonio Korea Concrete Institute 2007 International Journal of Concrete Structures and M Vol.1 No.1
A dynamic constitutive damage model for reinforced concrete (RC) structures and formulations of blast loading for contact or near-contact charges are considered and adapted from literatures. The model and the formulations are applied to the input parameters needed in commercial finite element method (FEM) codes which is validated by the laboratory blast tests of RC slabs from literature. The results indicate that the dynamic constitutive damage model based on the damage mechanics and the blast loading formulations work well. The framework on the dynamic constitutive damage model and the blast loading equations can therefore be used for the simulation of failure of bridge components in engineering applications.
A Multicast Routing Algorithm Based on Prior Objective Nodes
Weijun Yang,Xiaodong Wang,Yuanfeng Chen 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.10
The minimum Steiner tree problem is an NP-complete problem in multicast routing algorithms. In this paper, an improved algorithm called the prior nodes minimum cost path heuristic (PNMPH) algorithm is presented according to the shortage of the minimum cost path heuristic (MPH) algorithm, in which some paths that pass through prior destination nodes are selected first. It partly shares links in the network and decreases the cost of the multicast routing tree. It is also closer to the optimal solution with the time complexity O(n3). The simulation results on the existing networks show that the cost of the PNMPH algorithm is lower than that of the MPH algorithm in the case of more than 90%.
In Situ Synthesis and Strengthening of Powder Metallurgy High Speed Steel in Addition of LaB6
Weijun Shen,Linping Yu,Zhi Li,Yuehui He,Qiankun Zhang,Huibin Zhang,Yao Jiang,Nan Lin 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.6
A novel technology which was characterized by the vacuum solid state sintering was developed for powder metallurgyhigh speed steels production. During sintering, both the WC and Mo2C reacted with Fe and transformed toW and Mo rich M6C carbides which were the common hard phases in high speed steels. Also, a high number of W,Mo and Fe were dissolved in VC, forming the MC carbides. The densification of the material mainly relied on thesolubility effect during the M6C and MC carbides formation. By alloying with a 0.1 wt% of LaB6 to the steel, thebending strength and the fracture toughness were improved from 3290 MPa and 25.6 MPam1/2to 4018 MPa and29.4 MPam1/2, respectively. The TEM analysis demonstrated three types of reaction products by the LaB6 addition:the amorphous phase, the core-shell structure and the La2O3 phase. The impurity elements such as the Mg, Al,Si, S, Ca, and O were absorbed following the LaB6 addition. Moreover, the deoxidization effect caused by the LaB6addition promoted the sintering at a high-temperature period which contributed to the bending strength and fracturetoughness improvement.
Evaluating Wealth Management Centers in the Pearl River Delta by Using Principal Component Analysis
Weijun Xu,Shaoying Huang,Zhiqiang Wang 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.12
Because of the rapid development and wealth accumulation in the Pearl River Delta (PRD), most of the cities in this area are motivated to establish wealth management centers (WMCs). We create an evaluation index system for assessing the development level of WMCs in cities in the PRD; we develop this system by selecting 20 indicators including gross regional production (GDP). Subsequently, we use panel data from 2010 to 2013 of nine cities in the PRD to evaluate the financial competitiveness of each of these cities through principal component analysis (PCA); we further analyze the pioneering roles of Guangzhou and Shenzhen in establishing WMCs in the PRD. The numerical analysis results reveal that Shenzhen and Guangzhou rank first and second, respectively, regarding financial competitiveness in the PRD, indicating that the two cities play a leading role in the establishment of WMCs in the PRD.
Weijun Fu,Feng-juan Xu,Wen-bo Guo,Mei Zhu,Chen Xu 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.3
An efficient synthesis of 3-halofurans by the intramolecular cyclization of 2-(1-alkynyl)-2-alken-1-ones with cupric halide has been developed. A broad range of 3-chloro- and 3-bromofuran derivatives could be obtained in the present method in moderate to good yields. The 3-halofuran derivatives are potential synthetic intermediates for amplification of molecular complexity.
Multi-source Network-coded D2D Cooperative Content Distribution Systems
Weijun Xing,Fuqiang Liu,Chao Wang,Ming Xiao,Ping Wang 한국통신학회 2018 Journal of communications and networks Vol.20 No.1
In this paper, we investigate the information transmissionin a typical 5G device-to-device (D2D) communication applicationscenario, i.e., a content distribution system with a numberof information sources intending to broadcast their messages tomultiple destinations in the vicinity. Due to the dynamic natureof wireless signal propagation links, it is hard to guarantee a satisfactoryperformance by direct source-destination transmissions,especially when the system is operating in a reuse-mode. Relays canbe introduced to the system to solve this problem. However, adoptingthe conventional repetition coding at relays inefficiently utilizesthe available resources, for the considered multi-source scenario. Therefore, we investigate applying a class of finite-field networkcodes at the relays, when potentially three types of relays are deployedto assist the information distribution process. We proposedthe algorithms to derive the system outage probability and analyzethe trade-off between energy efficiency and spectral efficiency. Ouranalytical and numerical results clearly demonstrate the potentialof exploiting network-coded cooperative communications in future5G D2D systems.
Weijun He,Youguo Li,Sigen Ma 한국지질과학협의회 2023 Geosciences Journal Vol.27 No.2
The Daliang zinc deposit occurs in the southwestern Xiangxi–Qiandong Zn-Pb metallogenic belt and is located on the southeastern margin of the upper Yangtze block. In this study, we present results from petrographic observations, rare earth elements, C-H-O isotopes, and fluid inclusions. The zinc deposit is hosted by middle Cambrian dolomite. The ore-forming process is divided into three stages from early to late: pyrite-galena, sphalerite-pyrite-dolomite, and dolomite. The characteristics of the REEs suggest that multiple fluids were involved in hydrothermal dolomite precipitation under low-temperature conditions. Two types of hydrothermal dolomite fluid inclusions were identified: pure liquid phase inclusions and liquid-rich phase inclusions. The fluid inclusions of hydrothermal dolomite yield homogenization temperatures of 108–192℃ (average 153℃), with salinities of 12.3–26.4 wt% (average 23.0 wt%) NaCl equiv. The δ13Cfluid, δDfluid and δ18Ofluid values for ore-forming fluids range from −4.2 to −3.5‰ (mean −3.8‰), −38.8 to −34.3‰ (mean −36.0‰), and 6.2–6.4‰ (mean 6.3‰), respectively. This study demonstrates that ore-forming fluid was sourced from a moderate- to high-salinity basinal brine and leached metals from metasedimentary rocks of the basement in the Yangtze block. The main transportation of ore-forming fluid occurred in the form of chlorine complexes along well-developed faults, and sulfides precipitated with decreases in pressure and temperature, as well as pH changes. Studies of the Daliang zinc deposit suggest that it is a mediumto low-temperature MVT-like deposit.
Weijun Cheng,Yan Huang 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.7
The end-to-end performance of dual-hop wireless communication system with fixed gain relays is investigated over independent non-identical composite Nakagami-lognormal fading channels using mixture gamma distribution. Novel closed-form expressions for the outage probability, the average symbol error rate and the nth moments of end-to-end signal to noise ratio (SNR) for the considered system are derived, respectively. Numerical and simulation results are shown and discussed to verify the accuracy of the analytical results under different scenarios, such as varying average SNR, fading parameters per hop, and the location of relaying nodes.
Weijun Fang,Qiuxiang Zheng,Ying Fang,Hua-Bin Huang 한국물리학회 2019 Current Applied Physics Vol.19 No.2
The development of a highly effective and recyclable antibacterial agent is of great interest. In this work, magnetic Fe3O4/Ag antibacterial nanoagent was successfully fabricated through a facile surface functionalization approach. Utilizing the strong interaction between silver and the amino groups on the surface of Fe3O4 nanospheres, the nanosized silver particles were tightly bonded on the Fe3O4 nanospheres' surface, improving silver nanoparticalsʼ antibacterial activity by preventing agglomeration of silver nanoparticles. Our antibacterial tests showed that the as-synthesized Fe3O4/Ag nanospheres presented high antibacterial performance against Gram-negative and Gram-positive bacteria. Moreover, these antibacterial nanohybrids can be easily recycled from water solution by applying an external magnetic field. Overall, taking into consideration the facile preparation method, excellent antibacterial activity and high magnetic recycling property, the as-synthesized Fe3O4/Ag nanospheres have great potential applications in medicine and water disinfection.