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A high-efficiency simulation method of wind field and its application on transmission line
Xing Fu,Xing-Heng Zhang,Hong-Nan Li,Gang Li,Hui-Juan Liu 한국풍공학회 2021 Wind and Structures, An International Journal (WAS Vol.33 No.4
Generally, the fluctuating wind is simplified as several independent one-dimensional multivariate stationary Gaussian processes in simulating a natural wind field. The correlation in the lateral, longitudinal and vertical directions should all be considered in the simulation of longitudinal wind field for the large-span spatial structures. In fact, this type of structure has lots of simulation points. The calculation amount of wind field simulation by the harmonic superposition method depends on the scale of cross-spectral density matrix, which is directly related to the number of simulated points, leading to a low efficiency when generating the time-varying wind speed. This paper innovatively proposes a high-efficiency simulation method for the longitudinal wind field based on Taylor’s hypothesis. Subsequently, the effectiveness of the proposed wind field method was verified by the numerical simulation. Finally, the dynamic responses of a transmission tower-line system under the wind loadings generated with the new method and traditional method are calculated and compared. The percentages difference of the mean and maximum axial force at the main tower members are less than 0.02% and 1%, respectively, indicating the effectiveness of the proposed time delay method. The results also show that the proposed simulation method of wind field can not only ensure the simulation accuracy, but also significantly improve the efficiency of wind speed generation, which is suitable for the wind load simulation of large-span spatial structures.
Xing Fu,Run Hu,Xiaobing Luo 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.2
Acquiring the junction temperature of light emitting diode (LED) is essential for performanceevaluation. But it is hard to get in the multipleLED applications. In this paper, an engineeringmethod is presented to estimate the junction temperatures of LEDs in multiple LED applications. This method is mainly based on an analytical model, and it can be easily applied with some simplemeasurements. Simulations and experiments were conducted to prove the feasibility of the method,and the deviations among the results obtained by the present method with those by simulationas well as experiments are less than 2% and 3%, respectively. In the final part of this study, theengineering method was used to analyze the thermal resistances of a street lamp. The materialof leadframe was found to affect the system thermal resistance mostly, and the choice of soldermaterial strongly depended on the material of the leadframe.
Effect of fangchinoline on root resorption during rat orthodontic tooth movement
Xingfu Bao,Min Hu,Yi Zhang,Ferdinand Machibya,Ying Zhang,Huan Jiang,Dongsheng Yu 대한치과교정학회 2012 대한치과교정학회지 Vol.42 No.3
Objective: To evaluate the short-term effect of fangchinoline, an antiinflammatory drug widely used in Asia, on root resorption that is associated with orthodontic tooth movement. Methods: Twenty-four Wistar rats were randomly divided into 6 groups. Mesial forces of 0, 50, or 100 g were applied to the maxillary first molar of the rats in each group for 14 days by activating nickel-titanium closed-coil springs. One-half of the rats receiving each of these treatments also received injections of 200 μL fangchinoline every 2 days. Finally, movement of the maxillary first molars was measured using digitized radiographs. The molars were extracted and the surfaces of the root resorption craters were recorded using a scanning electron microscope. The distance the molars moved and resorptionarea ratio was measured, and results were analyzed using 2-way ANOVA tests. Results: There were no statistical differences in the distances the first molars moved under 50 or 100 g force, regardless of treatment with fangchinoline. However, the resorption area ratios were significantly smaller in those rats that were treated with both tension and fangchinoline than in those rats treated by tension alone. Conclusions: Fangchinoline reduced the resorption area ratio in rats and is therefore an important means of alleviating root resorption.
Anti-Diabetic Effect of Aster sphathulifolius in C57BL/KsJ-db/db Mice.
Yin, Xingfu,Huang, Yuhua,Jung, Da-Woon,Chung, Hee Chul,Choung, Se Young,Shim, Jae-Hoon,Kang, Il-Jun Mary Ann Liebert, Inc 2015 Journal of medicinal food Vol.18 No.9
<P>In this study, we investigated the anti-diabetic effect of Aster sphathulifolius (AS) extract in C57BL/KsJ-db/db mice. The db/db mice were orally administered with AS 50% ethanol extract at concentrations of 50, 100, and 200?mg/kg/day (db/db-AS50, db/db-AS100, and db/db-AS200, respectively) for 10 weeks. Food and water intake, fasting blood glucose concentrations, blood glycosylated hemoglobin levels, and plasma insulin levels were significantly lower in the db/db-AS200 group than in the vehicle-treated db/db group; whereas glucose tolerance was significantly improved in the db/db-AS200 group. Moreover, AS dose dependently increased both insulin receptor substrate 1 and glucose transporter type 4 expression in skeletal muscle, significantly increased glucokinase expression, and decreased glucose 6-phosphatase and phosphoenolpyruvate carboxykinase expressions in the liver. The expressions of transcription factors, such as sterol-regulatory element-binding protein, peroxisome proliferator-activated receptor γ, and adipocyte protein 2, were upregulated in adipose tissue. Furthermore, immunohistochemical analysis showed that AS upregulated insulin production by increasing pancreatic β-cell mass. In summary, AS extract normalized hyperglycemia by multiple mechanisms: inhibition of glyconeogenesis, acceleration of glucose metabolism and lipid metabolism, and increase of glucose uptake. Using in vivo assays, this study has shown the potential of AS as a medicinal food and suggests the efficacy of AS for the use of prevention of diabetes.</P>
Effect of fangchinoline on root resorption during rat orthodontic tooth movement
Bao, Xingfu,Hu, Min,Zhang, Yi,Machibya, Ferdinand,Zhang, Ying,Jiang, Huan,Yu, Dongsheng The Korean Association Of Orthodontists 2012 대한치과교정학회지 Vol.42 No.3
Objective: To evaluate the short-term effect of fangchinoline, an anti-inflammatory drug widely used in Asia, on root resorption that is associated with orthodontic tooth movement. Methods: Twenty-four Wistar rats were randomly divided into 6 groups. Mesial forces of 0, 50, or 100 g were applied to the maxillary first molar of the rats in each group for 14 days by activating nickel-titanium closed-coil springs. One-half of the rats receiving each of these treatments also received injections of 200 ${\mu}L$ fangchinoline every 2 days. Finally, movement of the maxillary first molars was measured using digitized radiographs. The molars were extracted and the surfaces of the root resorption craters were recorded using a scanning electron microscope. The distance the molars moved and resorption-area ratio was measured, and results were analyzed using 2-way ANOVA tests. Results: There were no statistical differences in the distances the first molars moved under 50 or 100 g force, regardless of treatment with fangchinoline. However, the resorption area ratios were significantly smaller in those rats that were treated with both tension and fangchinoline than in those rats treated by tension alone. Conclusions: Fangchinoline reduced the resorption area ratio in rats and is therefore an important means of alleviating root resorption.
굴행보 ( Qu Xingfu ) 영산대학교 동양문화연구원 2017 동양문화연구 Vol.27 No.-
劉國松現代水墨畵的探索是開拓性的, 他以具有實驗性的“畵若布?”反對傳統文人畵的臨摹觀, 幷推進中國畵工具、材料傳統及觀念的革新, 解構傳統的筆墨觀。 劉國松創立的現代水墨畵試圖在超越文人畵, 消解文人畵傳統的影響。 同時, 受現代抽象藝術的啓發, 劉國松創造了新的現代水墨語言體系, 建構了與文人畵的歷史和體系幷立的新傳統, 涵盖了從圖式系統到其背后的思想觀念。 應該說, 劉國松堅持文化本位, 兼容中國古典?畵與西方現代藝術的觀念, 開啓了一條新的中國畵之路。 Liu Guosong's exploration of modern ink paintings is pioneering. He against the copying of traditional literati paintings by the experimental‘ paintings as buyi’,and promote the innovation of Chinese ink painting’s tool, material, tradition and concept. Liu Guosong deconstructed traditional idea of brush and ink. Modern Chinese ink paintings attempted to beyond the literati paintings and dispel the influence of literati paintings tradition. Simultaneously, inspired by modern abstract art, Liu Guosong created a new modern ink language system and the new tradition exist side by side with the history and system of literati paintings. The new tradition covered the schematic system and the idea behind it.It can be said that Liu Guosong Adhered to cultural standards and fused the idea of Chinese classical paintings and western modern art.He opened a new way of Chinese paintings.
Effect of Short-Time Carburizing Treatment on Microstructure and Mechanical Properties of M50 Steel
Yinghua Wei,Xingfu Yu,Shuai Wang,Xiangyang Shen,Wenzeng Zhao,Yong Su,Yu Yang,Xiaochuan Feng 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.6
By using scanning electron microscope (SEM), transmission electron microscope (TEM), X-Ray diffraction (XRD), and hardnessand rotational bending fatigue tests, the effect of short-time carburizing treatment on the microstructure and mechanicalproperties of bearing steel was studied. The results show that when the M50 steel is not carburized, the hardness is 750 HV,the rotational bending fatigue limit is 1100 MPa, and the impact absorption energy is 15.46 J. After short-time carburizationwith the carbon potential of 0.6%, the maximum hardness in the carburized area, the rotational bending fatigue limitand the impact absorption energy are all increased to be 807.7 HV, 1210 MPa and 16.72 J respectively. When the carbonpotential is further enhanced to be 0.8%, the maximum hardness of the carburized area of the steel is further enhanced to be813.4 HV, but the rotational bending fatigue strength and the impact absorption energy are both decreased to be 1125 MPaand 13.65 J respectively, which has close relations with the increasement of undissolved carbides and the precipitation ofacicular carbides.
Topological entropy of switched systems
Yu Huang,Xingfu Zhong 대한수학회 2018 대한수학회지 Vol.55 No.5
For a switched system with constraint on switching sequences, which is also called a subshift action, on a metric space not necessarily compact, two kinds of topological entropies, average topological entropy and maximal topological entropy, are introduced. Then we give some properties of those topological entropies and estimate the bounds of them for some special systems, such as subshift actions generated by finite smooth maps on $p$-dimensional Riemannian manifold and by a family of surjective endomorphisms on a compact metrizable group. In particular, for linear switched systems on $\mathbb R^p$, we obtain a better upper bound, by joint spectral radius, which is sharper than that by Wang et al. in \cite{Wang-Ma2015, Wang-Ma-Lin2016}.
Jinxin Yao,Xingfu Lu,Fengxian Qiu 서울시립대학교 도시과학연구원 2022 도시과학국제저널 Vol.26 No.4
China’s migrant workers, the majority of whom are residents of rural China, have poured in to urban centres. Despite this influx, migrant workers have not integrated into urban society; rather, rural migrant life in cities is characterized by residential segregation and widespread social exclusion. This study explores the effect of residential segregation on the employment stability of China’s migrant population and investigates the intergenerational differences in this effect. Data were obtained from China’s 2014 special investigation on the social interactions and mental health of migrant workers and covered 6,805 and 3,237 people from the new generation (born in 1980 or later) and first-generation (born before 1980) migrant populations, respectively. Propensity score matching was employed to match those living in and outside of residentially segregated areas. Residential segregation had a significant adverse effect on the total sample’s employment stability. The negative effect of residential segregation on employment stability among the first-generation migrant population was found to be nonsignificant, but was significant for the new generation of migrants.