http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Qi Dong,Dan Zu,Lingqiang Kong,Sunfang Chen,Jun Yao,Jiawei Lin,Lei Lu,Bing Wu,Bin Fang 한국생체재료학회 2022 생체재료학회지 Vol.26 No.3
Background: Hydrogels loaded with antimicrobial agents have been widely used for treating infected wound defects. However, hydrogels derived from a porcine dermal extracellular matrix (PADM), containing silver nanoparticles (AgNPs), have not yet been studied. Therefore, we investigated the therapeutic effect of an AgNP-impregnated PADM (AgNP–PADM) hydrogel on the treatment of infected wounds. Methods: An AgNP–PADM hydrogel was synthesized by embedding AgNPs into a PADM hydrogel. We examined the porosity, moisture retention, degradation, antibacterial properties, cytotoxicity, antioxidant properties, and ability of the PADM and AgNP–PADM hydrogels to treat infected wounds in animals. Results: The PADM and AgNP–PADM hydrogels were pH sensitive, which made them flow dynamically and solidify under acidic and neutral conditions, respectively. The hydrogels also exhibited porous network structures, satisfactory moisture retention, and slow degradation. Additionally, the AgNP–PADM hydrogel showed a slow and sustained release of AgNPs for at least 7 days without the particle size changing. Thus, the AgNPs exhibited adequate antibacterial ability, negligible toxicity, and antioxidant properties in vitro. Moreover, the AgNP–PADM hydrogel promoted angiogenesis and healed infected skin defects in vivo. Conclusions: The AgNP–PADM hydrogel is a promising bioderived antibacterial material for clinical application to infected wound dressings
Qidong Geng,Wei Wang 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.3
7075-T651 aluminum alloy, which is is widely used in aircraft structural parts, exhibits high-strength deformation. This study proposes using ultrasonic impact enhancement technology to improve the fatigue resistance of this alloy and extend its service life. The principle of ultrasonic impact enhancement is based on equivalent impedance control. The surface-strengthening effect is verified via experiments. Results revealed that the surface roughness of the workpiece decreases from an original value of 0.713 μm to as low as 0.353 μm. The microhardness of the surface increases from 201 to 260 HV 0.1 . The residual stress of the surface also increases from −25 to −312 MPa. Under the constant impedance threshold, the surface roughness of the workpiece decreases and the surface microhardness as well as residual stress increase with increasing current output. Under the constant output current, the surface roughness of the workpiece decreases to its minimum value, the microhardness gradually increases, and the residual stress reaches its maximum value with increasing impedance threshold.
朱其东(Qidong Zhu),王连浩(Lianhao Wang) YIXIN 출판사 2024 Journal of China Studies Vol.2 No.1
制度理论的多维建构,是当前思想政治教育研究的重要内容和主要论域。然而现有学科理论的建构还存有理论规范性、认同性、整合性等亟需解决的问题。因而,需要进一步提升制度思维和逻辑能力,强化问题意识和实践意识,实现制度研究方法论的创新,以此加快思想政治教育制度理论的学科构建。 The multidimensional construction of institutional theory is an important content and main field of research in current ideological and political education. However, there are still urgent issues to be addressed in the construction of existing disciplinary theories, such as theoretical standardization, identity, and integration. Therefore, it is necessary to further enhance institutional thinking and logical abilities, strengthen problem awareness and practical awareness, and achieve innovation in institutional research methodology, in order to accelerate the disciplinary construction of ideological and political education system.
Research on damage of 3D random aggregate concrete model under ultrasonic dynamic loading
Lixiao Wang,Qidong Chen,Xin Liu,Bin Zhang,Yichen Shen 사단법인 한국계산역학회 2020 Computers and Concrete, An International Journal Vol.26 No.1
Concrete are the most widely used manmade materials for infrastructure construction across the world. These constructions gradually aged and damaged due to long-term use. However, there does not exist an efficient concrete recycling method with low energy consumption. In this study, concrete was regarded as a heterogeneous material composed of coarse aggregate and cement mortar. And the failure mode of concrete under ultrasonic dynamic loading was investigated by finite element (FE) analysis. Simultaneously, a 3D random aggregate concrete model was programmed by APDL and imported into ABAQUS software, and the damage plastic constitutive model was applied to each phase to study the damage law of concrete under dynamic loading. Meanwhile, the dynamic damage process of concrete was numerically simulated, which observed ultrasonic propagating and the concrete crushing behavior. Finally, the FE simulation considering the influence of different aggregate volume and aggregate size was carried out to illustrate the damage level of concrete.
Tingfang Zhang,Qidong Wang,Linfeng Zhao,Wuwei Chen,Bixin Cai,Mingyue Yan 한국자동차공학회 2024 International journal of automotive technology Vol.25 No.2
In the longitudinal driving of a heterogeneous platoon, external disturbances of local vehicles can cause safety problemsof the intended functionality. Therefore, a cooperative control method based on situation assessment is proposed. First, theminimum safe distance is determined according to the state of adjacent vehicles. A novel situation assessment model isestablished to characterize the stability of the platoon. Vehicle spacing, speed, and acceleration are selected as evaluationindicators. Then, an improved active disturbance rejection controller (IADRC) is designed to improve platoon stabilitythrough feedback compensation control. In addition, considering the unnecessary continuous involvement of the IADRC,its intervention time is determined by the situation assessment results. Finally, simulation and hardware-in-the-loop (HIL)experiments are carried out under two communication topologies. The results show that the proposed method can eff ectivelyimprove the stability and safety of the platoon.
Zhiyu Qian,Weihong Ding,Qidong Zhou,Shengyang Ge,Chuanyu Sun,Ke Xu 대한신경정신의학회 2021 PSYCHIATRY INVESTIGATION Vol.18 No.8
Objective The primary aim was to evaluate the influence of depressive and anxiety symptoms on the 1-year recurrence rate of non-muscle invasive bladder cancer (NMIBC) patients. The secondary aim was to examine the risk factors leading to psychological distress. Methods A total of 104 NMIBC patients were enrolled for interviews, and the Hospital Anxiety and Depression Scale (HADS) questionnaire survey was administered 1 month after their operation. Their cystoscopy results were followed up. The risk factors affecting their 1-year recurrence rate were evaluated through univariate analysis, Cox regression and Kaplan-Meier analysis. The risk factors causing depressive and anxiety symptoms were evaluated through univariate analysis and logistic regression. Results In addition to American Urological Association risk stratification, depressive symptoms were another independent risk factor for recurrence in NMIBC patients (HR: 2.493, 95% CI: 1.048-5.930, p=0.039), and the increase in the recurrence rate was highly significant in intermediate-risk patients (HR: 8.496, 95% CI: 2.178-33.138, p=0.019). Anxiety symptoms were not an independent risk factor for recurrence (HR: 1.655, 95% CI: 0.714-3.837, p=0.240). We also observed that the burden of medical expenses of NMIBC on the family was an independent risk factor for depressive symptoms (p=0.029) and anxiety symptoms (p=0.048); chronic pain was an independent risk factor for anxiety symptoms (OR: 3.447, 95% CI: 1.182-10.052, p=0.023). Conclusion Depression symptoms are an independent risk factor for recurrence in NMIBC patients. Moreover, the burden of medical expenses on the family is an independent risk factor for depressive and anxiety symptoms in NMIBC patients. Additionally, chronic pain is a risk factor for anxiety symptoms in NMIBC patients. This study provided a theoretical foundation for clinical oncologists to pay more attention to the mental health of NMIBC patients.
A THEORETICAL MODEL FOR OPTIMIZATION OF ROLLING SCHEDULE PROCEDURE PARAMETERS IN ERP SYSTEMS
Bai, Xue,Cao, Qidong,Davis, Steve 한국전산응용수학회 2003 Journal of applied mathematics & informatics Vol.12 No.1
The rolling schedule procedure has been an important part of the Enterprise Resource Planning (ERP) systems. The performance of production planning in an ERP system depends on the selection of the three parameters in rolling schedule procedure: frozen interval, replanning interval, and planning horizon (forecast window). This research investigated, in a theoretical approach, the combined impact of selections of those three parameters. The proven mathematical theorems provided guidance to re-duction of instability (nervousness) and to seek the optimal balance between stability and responsiveness of ERP systems. Further the theorems are extended to incorporate the cost structure.