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RISS 인기검색어
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- 저자 : Guozhen Wang (검색결과 4 건)
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Investigation of melting dynamics of filler wire during wire feed laser welding
Yangchun Yu,Wei Huang,Guozhen Wang,Jun Wang,Xuanxuan Meng,Chunming Wang,Fei Yan,Xiyuan Hu,Shengfu Yu 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.4
In order to investigate the mechanism of stability for the wire feed laser welding process, systematic experiments are carried out in this study for 5A06 aluminum alloy. By using high speed camera, the melting dynamics of filler wires with different feed positions and feed rates are studied. The results indicate that these two factors mainly influence the characteristics of the filler wire melting dynamics and determine the stability of the welding process. The melting dynamics of filler wire can be generally characterized by three different forms: explosion, big droplet and molten metal bridge. When the filler wire melts and transits to the molten pool in the forms of explosion or big droplet, the stability of the welding process is strongly disturbed, resulting in an undesirable weld quality. In contrast, when it is in molten metal bridge form, the welding process is more stable and a uniform weld bead is achieved.
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Extraction of parishin B and parishin C from Gastrodiae Rhizoma by subcritical water technology
Guozhen Wu,Hongjing Dong,Jia Li,Lanping Guo,Yan Cheng,Yanling Geng,Xiao Wang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.108 No.-
Subcritical water extraction (SWE) was used to extract bioactive parishin B (PB) and parishin C (PC) fromGastrodiae Rhizoma. Extraction conditions were optimized by Box-Behnken design (BBD) of responsesurface methodology (RSM). The highest yield of PB was 7.46 ± 0.18 mg/g when the solid/liquid ratio(SLR) was 4.5 mg/mL at an extraction temperature of 118 C and extraction time of 50 min, and the highestyield of PC was 5.27 ± 0.07 mg/g when the SLR was 22 mg/mL at an extraction temperature of 145 Cand extraction time of 23 min. Compared with heating reflux extraction the yield of PB was about 1.3times higher, and that of PC about 2.6 times higher; Compared with ultrasound assisted extraction theyield of PB was about 3 times higher, and that of PC about 6 times higher. Degradation of parishin Aby SWE showed that the increasing mechanism of PB and PC mainly attributed to the conversion of PAinto PB and PC. This study suggests that SWE was an efficient and green way to extract natural productswith greater values.
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Robust Secure Transmit Design with Artificial Noise in the Presence of Multiple Eavesdroppers
( Xiaochen Liu ),( Yuanyuan Gao ),( Nan Sha ),( Guozhen Zang ),( Shijie. Wang ) 한국인터넷정보학회 2021 KSII Transactions on Internet and Information Syst Vol.15 No.6
This paper studies secure wireless transmission from a multi-antenna transmitter to a single-antenna intended receiver overheard by multiple eavesdroppers with considering the imperfect channel state information (CSI) of wiretap channel. To enhance security of communication link, the artificial noise (AN) is generated at transmitter. We first design the robust joint optimal beamforming of secret signal and AN to minimize transmit power with constraints of security quality of service (QoS), i.e., minimum allowable signal-to-interference-and-noise ratio (SINR) at receiver and maximum tolerable SINR at eavesdroppers. The formulated design problem is shown to be nonconvex and we transfer it into linear matrix inequalities (LMIs). The semidefinite relaxation (SDR) technique is used and the approximated method is proved to solve the original problem exactly. To verify the robustness and tightness of proposed beamforming, we also provide a method to calculate the worst-case SINR at eavesdroppers for a designed transmit scheme using semidefinite programming (SDP). Additionally, the secrecy rate maximization is explored for fixed total transmit power. To tackle the nonconvexity of original formulation, we develop an iterative approach employing sequential parametric convex approximation (SPCA). The simulation results illustrate that the proposed robust transmit schemes can effectively improve the transmit performance.
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Zhiqian Pang,Zhuangzhi Zhou,Dedong Yin,Qiming Lv,Lixiang Wang,Xiao Xu,Jing Wang,Xiaobing Li,Xianfeng Zhao,Guanghuai Jiang,Jinping Lan,Lihuang Zhu,Songnian Hu,Guozhen Liu 한국식물학회 2013 Journal of Plant Biology Vol.56 No.6
Plant Bowman-Birk type bran trypsin inhibitors(BBTI) belong to a family of serine protease inhibitors thatinhibit trypsin activity and play roles in plant developmentand defense responses to both biotic and abiotic stresses. Inthis study, transgenic rice plants overexpressing BBTI4 (OXBBTI4)were generated. Reverse-transcription polymerasechain reaction and western blot (WB) analysis demonstratedthat the BBTI4 mRNA and protein levels were significantlyincreased in OX-BBTI4. Notably, two BBTI4 protein formswith different molecular weight (18 kD and 28 kD) wererevealed by WB analysis. In non-transgenic plants, BBTI4-28kD and BBTI4-18kD were mainly expressed in roots andleaves, respectively, while in transgenic OX-BBTI4 plants,both protein forms were expressed constitutively. Subcellularanalysis revealed that BBTI4 is localized in the cytosol. Moreover, Xanthomonas oryzae pv. oryzae (Xoo) inoculationexperiments demonstrated that transgenic OX-BBTI4 riceplants conferred partial but broad-spectrum Xoo resistance. InOX-BBTI4 transgenic rice plants, the expression of OsPR3 andOsPR10a proteins was induced and gradually increased afterXoo infection, while the expression of OsPR1a, OsPR1b andOsPR-pha remained unchanged. Taken together, these resultssuggest that BBTI4 may play a role in rice resistance to Xoo,and OsPR3 and OsPR10a may be involved in the OX-BBTI4-dependent partial Xoo resistance response.
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