Typicality and Centrality of Although and Though for Chinese English Learners

Wang Guofeng 새한영어영문학회 2023 새한영어영문학회 학술발표회 논문집 Vol.2023 No.5

An improved dynamic milling force coefficients identification method considering edge force

Guofeng Wang,Dongbiao Peng,Xuda Qin,Yinhu Cui 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.5

"The identification of the dynamic coefficients is the key to realize accurate simulation of dynamic milling process. To enlarge the scope of dynamic simulation without ignoring edge force, an improved method is presented to calculate milling force coefficients. In this method, linear approximation of average milling force is integrated with multiple linear regressions by supposing that milling force coefficients are time invariant for small variation of feed rate. Therefore, both the shear coefficients and the edge coefficients can be calculated simultaneously. A comparison of simulated milling force with and without the edge force is illustrated and the result shows that the accuracy is higher if the edge force coefficients are considered. This method casts new light on fast and accurate simulation of the dynamic milling force in real industrial environment."

Tool wear prediction considering uncovered data based on partial least square regression

Guofeng Wang,Zhiwei Guo,Lei Qian 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.1

Tool wear prediction plays an important role in guaranteeing the workpiece quality and improving the production efficiency. However,because of the uncertainty and complexity of tool wear process, it is hard to ensure that the samples related to all tool wear values can becollected during the training stage. Therefore, the accuracy of tool wear prediction for these uncovered data will deteriorate severely. Inthis paper, partial least square regression is presented to realize the tool wear prediction based on force signal. The main characteristic ofthis method is that the regression analysis is in the principal component space so that the multicollinearity between explanatory variablescan be avoided effectively. Side milling experiment was carried out to validate the effectiveness of the proposed model. The analysis andcomparison under different number of uncovered data show that the partial least square regression based tool wear prediction is moreaccurate.

中国河南省高校就业竞争力实证研究

王淼丹(Miaodan Wang),商敏(Min Shang),范国锋(Guofeng Fan),王梦洁(Mengjie Wang),彭丽玲(Liling Peng),尚莫依(Moyi Shang) YIXIN 출판사 2023 教育教学研究论丛 Vol.1 No.2

随着高校“扩招”的推行,中国高校毕业生数量骤增,就业市场遭受冲击,高校毕业生就业问题日益凸显。以高考大省河南省为例,结合当今时代教育的发展以及社会对人才的需求,首先通过灰色关联度模型确定 12 个指标与就业竞争力的关联程度;其次采用 G1-熵权组合赋权法对各指标赋予权值大小,然后采用 WRSR 综合评价法对省内本科院校就业竞争力进行分档和评价分析。结果表明,同档次学校具备着类似的问题,可以相互交流,对其相关重要指标,结合学科特点可开展组团式发展和提升。 With the implementation of “enrollment expansion” in universities, the number of college graduates in China has increased sharply, the job market has been impacted, and the employment problem of college graduates has become increasingly prominent. We take Henan Province, a major province of the college entrance examination, as an example to study employment competitiveness of undergraduate colleges and universities, combined with the development of education in the current era and the social demand for talents. Firstly, the correlation degree between 12 indicators and employment competitiveness was determined by the grey correlation degree model; Secondly, the G1-entropy weight combination weighting method was used to assign weights to each index; and then the WRSR comprehensive evaluation method was used to classify and evaluate the employment competitiveness of undergraduate universities in the province. The results show that colleges and universities of the same grade have similar problems and can communicate with each other, and can carry out group development and promotion of the relevant important indicators combined with subject characteristics.

L-Leucine increases the daily body temperature and affords thermotolerance in broiler chicks

Guofeng Han,Hui Yang,Yunhao Wang,Shogo Haraguchi,Takuro Miyazaki,Takashi Bungo,Kosuke Tashiro,Mitsuhiro Furuse,Vishwajit S. Chowdhury 아세아·태평양축산학회 2019 Animal Bioscience Vol.32 No.6

Objective: Heat stress poses an increasing threat for poultry production. Some amino acids have been found to play critical roles in affording thermotolerance. Recently, it was found that in ovo administration of L-leucine (L-Leu) altered amino acid metabolism and afforded thermotolerance in heat-exposed broiler chicks. Methods: In this study, two doses (35 and 70 μmol/egg) of L-Leu were administered in ovo on embryonic day 7 to determine their effect on rectal temperature (RT), body weight (BW) and thyroid hormones at hatching. Changes in RT, BW, and thermotolerance in post-hatched chicks were also analyzed. Results: It was found that in ovo administration of L-Leu dose-dependently reduced RT and plasma thyroxine (T4) level just after hatching. In post-hatched neonatal broiler chicks, however, the higher dose of L-Leu administered in ovo significantly increased RT without affecting BW gain. In chicks that had been exposed to heat stress, the RT was significantly lowered by in ovo administration of L-Leu (high dose) in comparison with the control chicks under the same high ambient temperature (HT: 35°C±1°C, 120 min). Conclusion: In ovo administration of L-Leu in a high dose contributed to an increased daily body temperature and afforded thermotolerance under HT in neonatal broiler chicks.

Green algae dominance quickly switches to cyanobacteria dominance after nutrient enrichment in greenhouse with high temperature

Wang, Xiaodong,Liu, Xingguo,Qin, Boqiang,Gu, Zhaojun,Wu, Zongfan,Xu, Hao,Zhu, Hao,Cheng, Guofeng,Liu, Huang The Ecological Society of Korea 2015 Journal of Ecology and Environment Vol.38 No.3

In order to understand the mechanisms of conversion between different algal dominance, an experiment was performed in a greenhouse from 22 June to 10 July 2011. The experiment included a treatment group subjected to three instances of nutrient enrichment and a control with no nutrient enrichment. The initial water was dominated by Ankistrodesmus of Chlorophyta. The average water temperature at 08:30 h and 14:00 h during the experiment was $31.6^{\circ}C$ and $34.6^{\circ}C$, respectively. The results showed that the total nitrogen (TN), total phosphorus (TP), dissolved total nitrogen (DTN), dissolved total phosphorus (DTP), and soluble reactive phosphorus (SRP) concentrations in the treatment were significantly higher than in the control (P < 0.05). However, the TN/TP and DTN/DTP in the control was higher than in the treatment (P < 0.05). The dominant algae in the control did not change during the experiment, while the dominant algae in the treatment switched to Planktothrix of Cyanophyta on day 9. The chlorophyll a (Chl-a), wet weight of all algae, wet weight of Cyanophyta, and percentage of Cyanophyta in the control were all significantly lower than in the treatment (P < 0.05). Amounts of zooplankton, especially rotifers, were present at the end of the experimental period. The density of rotifers between the control and treatment was not significantly different (P > 0.05), while the copepod density in the treatment was higher than in the control (P < 0.05). We conclude that green algae dominance quickly switches to cyanobacteria dominance after nutrient enrichment in a greenhouse with elevated temperature.

Green algae dominance quickly switches to cyanobacteria dominance after nutrient enrichment in greenhouse with high temperature

Xiaodong Wang,Xingguo Liu1,Boqiang Qin,Zhaojun Gu,Hao Xu,Hao Zhu,Guofeng Cheng,Huang Liu 한국생태학회 2015 Journal of Ecology and Environment Vol.38 No.3

In order to understand the mechanisms of conversion between different algal dominance, an experiment was performed in a greenhouse from 22 June to 10 July 2011. The experiment included a treatment group subjected to three instances of nutrient enrichment and a control with no nutrient enrichment. The initial water was dominated by Ankistrodesmus of Chlorophyta. The average water temperature at 08:30 h and 14:00 h during the experiment was 31.6°C and 34.6°C, respec¬tively. The results showed that the total nitrogen (TN), total phosphorus (TP), dissolved total nitrogen (DTN), dissolved total phosphorus (DTP), and soluble reactive phosphorus (SRP) concentrations in the treatment were significantly higher than in the control (P < 0.05). However, the TN/TP and DTN/DTP in the control was higher than in the treatment (P < 0.05). The dominant algae in the control did not change during the experiment, while the dominant algae in the treat¬ment switched to Planktothrix of Cyanophyta on day 9. The chlorophyll a (Chl-a), wet weight of all algae, wet weight of Cyanophyta, and percentage of Cyanophyta in the control were all significantly lower than in the treatment (P < 0.05). Amounts of zooplankton, especially rotifers, were present at the end of the experimental period. The density of rotifers between the control and treatment was not significantly different (P > 0.05), while the copepod density in the treatment was higher than in the control (P < 0.05). We conclude that green algae dominance quickly switches to cyanobacteria dominance after nutrient enrichment in a greenhouse with elevated temperature

Hierarchical porous composites derived from spent tire char for CO2 capture: K-N co-doped, process intensification and thermodynamic analysis

Hongguan Wang,Guofeng Qiu,Yanjie Niu,Liqing Chen,Yan Li,Sixi Guo,Yixin Zhang,Jianjun Wu,Fanhui Guo 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.125 No.-

Spent tire is a kind of solid waste with large production, accumulation and great pollution. Spent tire charis the primary product of tire harmless disposal. Its commercial value is enhanced by modification. In thisstudy, K-N co-doped activated carbon was prepared by using spent tire char as raw material, KOH andmelamine as activator and dopant to enhance CO2 capture. In comparison with traditional process, thereasons for the decrease in specific surface area and pore volume caused by K doped have been identified,and a potential doped mechanism has been proposed. It was determined that pyridine nitrogen in theamino functional group played a key role in CO2 adsorption. Meanwhile, the synergistic intensificationof CO2 adsorption by potassium phenolic and pyridine nitrogen was verified by simplified model simulation. The precise K-N doping significantly intensify the CO2 adsorption capacity of spent tire char from0.45 to 2.60 mmol/g (1 bar, 0℃), an increase of 4.78 times. Thermodynamic studies have demonstratedthat the Langmuir model accurately describes the adsorption process, and the adsorption reaction takesplace spontaneously at temperatures below 80.52 C. This work presents an efficient process for upgradingspent tire char, and a novel method of co-treating waste and CO2.

Mussel Adhesive Protein/platelet-rich Plasma Composite-coated Titanium Surfaces Increase Functionality of Dermal Fibroblasts

Zhongshan Wang,Haiyan Qin,Zhihong Feng,Guofeng Wu,Shizhu Bai,Yan Dong,Yimin Zhao 한국생물공학회 2015 Biotechnology and Bioprocess Engineering Vol.20 No.3

Bacterial invasion and epithelial downgrowth with pocket formation are still severe clinical challenges for transcutaneous implants, and both have a close relationship with the lack of a stable biological seal around the transcutaneous parts. Dermal fibroblasts are the main cells in the skin tissue and have been proven to play vital roles in the formation of biological seals. In this work, platelet-rich plasma (PRP), which can release high concentrations of natural cytokines upon activation, was used to stimulate rapid fibroblast growth. Mussel adhesive proteins (MAPs) were used as mediators to anchor the platelets in the PRP onto Ti surfaces, and MAP/PRP composite-coated Ti surfaces were constructed successfully. This in vitro study indicated increased fibroblast adhesion (P < 0.05), spreading, and proliferation (P < 0.05) and upregulated extracellular matrix-related gene expression (P < 0.05) on a MAP/PRP composite-coated Ti surface compared with a control smooth Ti surface. Our results suggest that MAP/PRP composite-coated Ti surfaces are potentially useful for the formation of a stable biological seal in transcutaneous areas.

A Novel Torque Ripple Suppression Scheme of Switched Reluctance Motors Based on Unipolar Sinusoidal Current Excitation

Liu Jian,Wang Guofeng,Liu Di,Fan Yunsheng,Sheng Linhao 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.4

This paper presents a novel control strategy for switched reluctance motors under unipolar sinusoidal excitation to minimize torque ripple at medium and low speeds. This strategy focuses on enhancing both the accuracy of the conversion process and the performance of current tracking. For the conversion scheme, a modifi ed back propagation neural network that considers the magnetic saturation characteristic is proposed. The lightweight network structure of this conversion allows for seamless integration into the unipolar sinusoidal excitation strategy, enabling fast and accurate online calculation of the q-axis current. Additionally, to improve the current tracking capability, an improved predictive current controller is designed, with a Luenberger disturbance observer incorporated to address predictive model mismatch. The stability of the system is proven in the discrete-time domain using the Jury criterion. Experimental results demonstrate that the proposed method can eff ectively suppress both torque ripple and disturbances, achieving good overall performance.