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Research on Parallel KD-Tree Construction for Ray Tracing
Zhang Peicheng,Xu Huahu,Bian Minjie,Honghao 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.11
Many computer graphics rendering algorithms and techniques use ray tracing for generation of photo-realistic images, and kd-tree is the most popular acceleration data structure for ray tracing. In order to avoid the inefficient parallel performance of kd-tree construction based on surface area heuristic (SAH), an algorithm using Morton code and path compression was present in this paper. Instead of building a kd-tree layer-by-layer, the proposed approach can be performed in parallel from bottom of a conceptual perfect binary tree. Experimental results on GPU show that our work achieves a faster kd-tree construction procedure.
Nian Zhang,Zhongsheng Tan,Minjie Jin 대한토목학회 2015 KSCE Journal of Civil Engineering Vol.19 No.3
By taking the 32.645-kilometer-long Guanjiao tunnel of Qinghai-Tibet railway as the object of research, the technology of disasterprevention and rescue in the high-altitude super-long railway tunnel was studied. Combined methods of fire model test and numericalsimulation, combustion characteristics in the high-altitude super-long railway tunnel were discussed, and the Available SafetyEvacuation Time (ASET) was obtained. From the viewpoint of people's safety evacuation, software called STEPS was used toestablish the personnel evacuation model aimed to simulate the process of the personnel evacuation and analyze the evacuation timeunder different fire scenes at the emergency station. Setting schemes of the emergency station and the cross-passage of Guanjiaosuper-long railway tunnel were determined preliminarily, and it also provided a basis for optimizing the design of safety evacuationfacilities of the super-long railway tunnel.
국내 스마트하우스 연구사례를 활용한 층간소음 문제해결 방안
김민지(Minji Kim),장성욱(Sung-Uk Zhang) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12
We would like to come up with a solution to the problem by utilizing domestic smart house research cases of noise between floors, which has become an issue in society. Among the various research cases, we want to create a plan by attaching sensors to slabs and ceilings to alert mobile phones when noise occurs.
Duan Chunzheng,Zhang Fangyuan,Qin Siwei,Sun Wei,Wang Minjie 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.9
White layer formed in hard cutting process has great influence on surface quality of the workpiece, simulation of the white layer has great significance. Dynamic recrystallization critical temperature model is derived to calculate the critical temperature of the dynamic recrystallization in the white layer. A finite element model was developed to simulate the hard cutting process based on the JohnsonCook constitutive equation. The dynamic recrystallization critical temperature was derived based on the true stress-strain curves obtained by the split Hopkinson pressure bar experiments. The cellular automaton model which aims to simulate the white layer grains formed by the dynamic recrystallization process in hard cutting is established. The temperature and strain data extracted from the finite element model are used in the cellular automaton model. The contrast between the simulation and experimental results demonstrates that the cellular automaton model can simulate the dynamic recrystallization process in the white layer accurately. The dynamic recrystallization processes in the white layer under different cutting speed and flank wear are simulated based on the finite element - cellular automaton model. The results show that the dynamic recrystallization grain size of the white layer decreases with the increase in cutting speed and tool wear.
Study on Carbon Sequestration Capacity of Typical Crops in Northern China
Tianxin Li,Fang Zhang,Yuanyuan Jiao,Minjie Zhang,Yanhong Chang,Nametso Matomela 한국식물학회 2019 Journal of Plant Biology Vol.62 No.3
The carbon sequestration potential of differentcrops in their mature period in Northern China was analyzedin order to promote the selection of green species. Carbondioxide infrared gas detection, three-dimensional fluorescence,fixed carbon enzyme activity analysis and other methodswere used to test the carbon sequestration capacity of ninerepresentative mature crops in the Beijing area. Results showthat the carbon sequestration capacity of the nine crops was:corn > sorghum > wheat > tomato > cucumber > cabbage >celery > eggplant > pepper. Among them, the carbonsequestration capacity of corn and sorghum which are C4crops was stronger than that of other crops. Meanwhile, thethree-dimensional fluorescence spectra of corn were closer tosorghum, and there were significant differences in thecharacteristics of the three-dimensional fluorescence spectraof C3 crops. Based on the analysis of the activity of the fixedcarbon enzyme—Phosphoenolpyruvate Carboxylase (PEP)carboxylase and Ribulose-1, 5-Bisphosphate (RuBP)Carboxylase of these plants show that the carbon sequestrationcapacity of C4 crops was much larger than C3 crops becauseof its higher PEP carboxylase activity. The carbon sequestrationcapacity of C3 crops was positively correlated with theactivity of RuBP carboxylase in addition to cabbage. Therefore,the carbon sequestration capacity of crops can be measuredby using the portable carbon dioxide infrared analyzer.
Inhibition of Dll4/Notch1 pathway promotes angiogenesis of Masquelet’s induced membrane in rats
Qian Tang,Haimin Jin,Minji Tong,Gang Zheng,Zhongjie Xie,Shangkun Tang,Jialei Jin,Ping Shang,Huazi Xu,Liyan Shen,Yu Zhang,Haixiao Liu 생화학분자생물학회 2018 Experimental and molecular medicine Vol.50 No.-
The Masquelet’s induced membrane technique for repairing bone defects has been demonstrated to be a promising treatment strategy. Previous studies have shown that the vessel density of induced membrane is decreased in the late stage of membrane formation, which consequently disrupts the bone healing process. However, relatively little is known about certain mechanisms of vessel degeneration in the induced membrane tissue and whether promotion of angiogenesis in induced membranes can improve bone regeneration. Here, we showed that the Delta-like ligand 4/ Notch homolog 1 (Dll4/Notch1) pathway was relatively activated in the late stage of induced membrane, especially at the subcutaneous site. Then, DAPT, a classical γ-secretase inhibitor, was applied to specifically inhibit Notch1 activation, followed by up-regulation of vascular endothelial growth factor receptor 2 (VEGFR2) and CD31 expression. DAPTmodified induced membranes were further confirmed to contribute to bone regeneration after autogenous bone grafting. Finally, in vitro experiments revealed that knocking down Notch1 contributed to the functional improvement of endothelial progenitor cells (EPCs) and that DAPT-treated induced membrane tissue was more favorable for angiogenesis of EPCs compared with the vehicle group. In conclusion, the present findings demonstrate that Dll4/ Notch1 signaling is negatively associated with the vessel density of induced membrane. Pharmacological inhibition of Notch1 attenuated the vessel degeneration of induced membrane both in vitro and in vivo, which consequently improved bone formation at the bone defect site and graft resorption at the subcutaneous site.