The Study of International Cooperation on Emergencies

An Chen,Jing Rui Chen,Fei Chi 위기관리 이론과 실천 2017 Journal of Safety and Crisis Management Vol.7 No.1

International cooperation on emergencies is significant to the response of these emergencies. Firstly, the connotation and characteristics of international cooperation on emergencies were analyzed. Secondly, the typical types of emergencies in need of international cooperation, the types of countries involved in international cooperation and the typical types of international cooperation modes on emergencies were analyzed in order to explain the mechanism of international cooperation. Finally, some strategies of international cooperation on emergencies were proposed. The result shows that, in order to have a better international cooperation, international cooperation modes on emergencies should be determined according to the types of emergencies, the situations of countries and organizations involved in it.

Dislocation Density-Based Constitutive Model and Processing Map for T2 Copper During Isothermal and Time-Variant Deformation

Gang Chen,Yu Jin,Jing Wang,Cheng Zhang,Qiang Chen,Hongming Zhang,Xingjian Zhao,Zhiyong Li,Changhai Xie,Zhiming Du 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.9

Isothermal compression tests were carried out to study the hot deformation behavior of T2 copper under various conditions. The deformation parameters, such as temperature and strain rate, have strong influence on flow stress and microstructureevolution of the alloy. A unified dislocation density-based model considering dynamic recovery and recrystallization wasestablished. And material parameters of the developed model were optimized by genetic algorithm. Comparisons betweenthe experimental and model data demonstrates that the developed model can precisely describe the flow behavior at quitewide range of deformation conditions. Meanwhile, the designed iterative procedure allows the model to be applied in timevariantdeformation conditions. Processing map and microstructure examination were constructed to optimize the processingwindow of the studied alloy. According to the processing maps, flow instability mainly appeared at low temperatures of500–650 °C and strain rates higher than 0.1 s−1. The optimum deformation parameters of T2 copper was concluded as thetemperature range of 700–800 °C and the strain rate of 0.1–1 s−1.

Breviscapine Ameliorates Fear Extinction and Anxiety in BALB/cJ Mice

Wei Liang(Wei Liang),Jing Huang(Jing Huang),Shuya Yang(Shuya Yang),Peng Huang(Peng Huang),Jun Chen(Jun Chen),Chen Chen(Chen Chen),Qun Yang(Qun Yang),Fengzhan Li(Fengzhan Li) 대한신경정신의학회 2023 PSYCHIATRY INVESTIGATION Vol.20 No.3

Objective In this research, the influence of breviscapine on anxiety, fear elimination, and aggression and the potential mechanism was investigated. Methods Anxiety and locomotion were analyzed by elevated plus maze and open field test in mice. Bussey-Saksida Mouse Touch Screen Chambers were used to perform fear conditioning. Territorial aggression was assessed by resident intruder test. Protein levels were evaluated by Western blot. Breviscapine improved fear-extinction learning in BALB/cJ mice. Results Breviscapine at 20-100 mg/kg increased center cross number, total distance traveled, and velocity in a dose-dependent manner. On the other hand, breviscapine at 20-100 mg/kg decreased the immobility time in open field test. In addition, breviscapine at 20-100 mg/kg increased the ratio of time on the open arm, time on the distal parts of the open arm, and total distance traveled in elevated plus maze. Breviscapine at 100 mg/kg increased the average attack latency and decreased the number of attacks over the last 3 days of resident intruder test. In hippocampus, protein levels of postsynaptic density protein-95 and synaptophysin were elevated by breviscapine at these three doses. Conclusion The administration of breviscapine alleviates fear extinction, anxiety, and aggression, while increases locomotor in a dose-dependent manner, which might be associated with its influence on synaptic function.

Efficient degradation of imidacloprid in wastewater by a novel p-n heterogeneous Ag2O/BiVO4/diatomite composite under hydrogen peroxide

Jing Chen,Qifang Ren,Chunshan Xu,Bin Chen,Shaohua Chen,Yi Ding,Zhen Jin,Wanmi Guo,Xinyu Jia 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.123 No.-

In this study, Ag2O/BiVO4/diatomite composite with p-n heterojunction structure was synthesized bysimple hydrothermal method with diatomite as carrier. It was found that under the action of hydrogenperoxide (H2O2), the imidacloprid (IMD) could be effectively degraded by the composite. Systemic evaluationswas conducted on effects of pH value, catalyst dosage, H2O2 concentration, initial IMD concentration,and anion on how effeciently this new photocatalytic composite can degrade IMD. The results showthat the p-n heterojunction formed between the two contact surfaces of Ag2O nanoparticle and BiVO4promotes the charge transfer between the interfaces, inhibits recombination of electrons and holes,and thus significantly improves the catalytic performance. The stability and reusability of Ag2O/BiVO4/diatomite composites were tested with ICP experiment and cyclic experiment. Active substancecapture experiment and ESR reveal the photocatalytic reaction mechanism and confirm that superoxideradical (O2), hydroxyl radical (OH), and h+ can promote the degradation of IMD. The degradation productsand the intermediates of IMD were identified through LC-MS, on a basis of which the possible transformationpathway was proposed. In situ synthesis of p-type Ag2O and n-type BiVO4 heterojunctioncomposites has opened a new direction for photocatalytic degradation of organic pollutants.

Computed Tomography Manifestations of Histologic Subtypes of Retroperitoneal Liposarcoma

Lu, Jing,Qin, Qin,Zhan, Liang-Liang,Yang, Xi,Xu, Qing,Yu, Jing,Dou, Li-Na,Zhang, Hao,Yang, Yan,Chen, Xiao-Chen,Yang, Yue-Hua,Cheng, Hong-Yan,Sun, Xin-Chen Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.15

Objective: Liposarcoma (LPS) is the most common soft tissue sarcoma and accounts for approximately 20% of all mesenchymal malignancies, often occurring in deep soft tissue of retroperitoneal space. Accurate preoperative diagnosis is therefore necessary. We explored whether computed tomography (CT) could be used to differentiate between the various types of retroperitoneal liposarcoma (RPLS). Method: Forty-seven cases of RPLS, diagnosed surgically and histologically, were analyzed retrospectively. CT features were correlated with postoperative pathological appearance. Results: The study radiologist identified 29, 11, 2, 2 and 3 RPLS as atypical lipomatous tumor/well-differentiated liposarcoma (ALT/WDL), dedifferentiated liposarcoma (DDL), myxoid/round cell liposarcoma (ML/RCL), pleomorphic liposarcoma (PL) and mixed-type liposarcoma. Analysis of CT scans revealed the following typical findings of the different subtypes of RPLS: ALT/WDL was mainly visible as a well-delineated fatty hypodense tumor with uniform density and integrity margin; DDL was marked by the combination of focal nodular density and hypervascularity. ML/RCL, PL and mixed liposarcoma showed malignant biological behaviour and CT findings need further studies. Conclusions: CT scanning can reveal important details including internal components, margins and surrounding tissues. Based on CT findings, tumor type can be roughly evaluated and biopsy location and therapeutic scheme guided.

중국인 초급 학습자를 위한 한국어 연어 교육 연구

진정정 ( Jing Jing Chen ) 연세대학교 언어연구교육원 한국어학당 2015 외국어로서의 한국어교육 Vol.42 No.-

I think that collocation should be introduced in the early stage of learning. Beginner level students have lack of ability to organize sentences because their vocabulary power is weak and their understanding of grammar is also poor. Teaching collocation as a lump, it will be relatively easy to organize sentences. In particular, there is need to emphasize on collocation education for the Chinese students who are good at memorizing since their early stage of education. The similarity between Korean and Chinese language is the existence of Chinese character in the vocabulary system of both languages, which is why it makes more difficult for Chinese students than English speaking learners. While teaching to the beginner level students, many such cases occur where collocation is not appropriate. This is because there is no list of collocation prepared for beginner level Chinese students. It will be very beneficial for the beginner level Chinese students and to the field of Korean teaching in China, If a list of collocation is selected, classified from Chinese grammar pattern and compared with Chinese expression and then the course is designed keeping target to make it easy to catch mistakes made by beginner level Chinese students. (Kyunghee University)

정사각형 단면을 갖는 180° 곡관에서 위치별 속도분포특성 및 직관거리의 유효성에 관한 연구

진정정(Jing-Jing Chen),윤준규(Jun-Kyu Yoon) 한국산학기술학회 2016 한국산학기술학회논문지 Vol.17 No.10

본 연구는 정사각형 단면 180° 곡관 내의 유동특성을 파악하기 위해 RSM 난류모델을 이용하여 작동유체, 입구의 공기속도, 관내의 표면조도, 곡률반경 및 수력직경 등의 다양한 유동인자를 변경하여 각도 위치별 속도분포특성을 수치해석을 통하여 고찰하였다. CFD 해석시 경계조건은 공기와 물의 입구온도를 288 K, 293 K로 설정하였고, 입구의 공기속도, 관내의 표면조도, 곡률반경 및 수력직경은 각각 3∼15 m/s, 0∼0.001 mm, 2.5∼4.5D, 70∼100 mm로 적용하여 해석을 수행하였다. 그 결과를 정리하면, 작동유체의 유동특성은 유체의 점성력 차이로 속도분포가 크게 달라짐을 알 수 있었고, 곡관부 내에서의 최대 속도프로파일은 90° 단면위치에서 X/D=0.8 영역으로 나타났으며, 180° 단면위치에서는 Y/D=0.8 영역으로 나타났다. 그리고 관내의 표면조도가 낮고, 곡률반경이 클수록 속도변화율은 크게 변하여 나타냈다. 또한 곡관후류의 직관부에서 유동편차가 안정화되는 직관거리는 L/D=30 영역에서 나타내어 유량 계측시 유효한 측정위치로 잘 제시할 수 있었으며, 수력직경에 따라 곡관후류 직관부의 표준편차특성은 동일한 유속일 때 최소의 편차영역은 대체로 직관거리 L/D=15∼30 범위로 나타났다. This study numerically analyzes the characteristics of the velocity distribution for each location of a square-sectional 180° bent duct using a Reynolds Stress Turbulent model. The flow parameters were varied, including the working fluids, inlet velocity, surface roughness, radius of curvature, and hydraulic diameter. The boundary conditions for computational fluid dynamics analysis were inlet temperatures of air and water of 288 K and 293 K, inlet air velocity of 3-15 m/s, inner surface roughness of 0-0.001 mm, radius of curvature of 2.5-4.5 D, and hydraulic diameter of 70-100 mm. The working fluid characteristics were highly affected by changes in the viscous force. The maximum velocity profiles in the bent duct were indicated when the 90° section was in the region of X/D=0.8 and the 180° section was in the region of Y/D=0.8. Lower surface roughness and higher radius of curvature resulted in a higher rate of velocity change. Also, an efficient measuring location downstream of the bent duct is suggested since the flow deviations were the most stable when the straight duct length was in the region of L/D=30. The minimum deviations at the same velocity conditions according to the hydraulic diameter were mostly indicated in the range of L/D=15-30 based on the standard deviation characteristics.

Analysis on the Current Situation and Countermeasures of the Risk of "City Besieged by Garbage" in China’s Capital Cities

Chen JingRui,Cui Jing,Chen An 위기관리 이론과 실천 2017 위기관리 이론과 실천 학술대회 Vol.2017 No.12

The rapid development of the Chinese is under the risk of "city besieged by garbage", although the local government introduced the relevant policies to work out this problem ,the risk of "city besieged by garbage" should be taken seriously with the status of city population continue to accumulate. This research choose 31 provincial capital of China as sample, using multidimensional spatial data software identify the number and size of informal landfill space around the sample, gets the index of "trash stock index". On this basis, establish the index system of the risk of "city besieged by garbage" to identify risks for 31 provincial capital of China, according to ranking and status give suggestion for government and improve garbage disposal issues.

NUMERICAL SIMULATION FOR LOW SPEED SEPARATED FLOWS PAST AIRFOILS WITH SPOILERS

Jing Song Chen,Shao Peng Sun 대한기계학회 1992 International Conference on Fluid Machinery Vol.1 No.1

Vibration characteristics of functionally graded carbon nanotube-reinforced composite double-beams in thermal environments

Jing-Lei Zhao,Xu Chen,Gui-Lin She,Yan Jing,Ru-Qing Bai,Jin Yi,Hua-Yan Pu,Jun Luo 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.43 No.6

This paper presents an investigation on the free vibration characteristics of functionally graded nanocomposite double-beams reinforced by single-walled carbon nanotubes (SWCNTs). The double-beams coupled by an interlayer spring, resting on the elastic foundation with a linear layer and shear layer, and is simply supported in thermal environments. The SWCNTs gradient distributed in the thickness direction of the beam forms different reinforcement patterns. The materials properties of the functionally graded carbon nanotube-reinforced composites (FG-CNTRC) are estimated by rule of mixture. The first order shear deformation theory and Euler-Lagrange variational principle are employed to derive the motion equations incorporating the thermal effects. The vibration characteristics under several patterns of reinforcement are presented and discussed. We conducted a series of studies aimed at revealing the effects of the spring stiffness, environment temperature, thickness ratios and carbon nanotube volume fraction on the nature frequency.