Application of Improved Neural Network in the Automotive Engine Fault Diagnosis

Di Lu,Jing Liu 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.4

A meta-analysis on advantages of peripheral nerve block post-total knee arthroplasty

( Di You ),( Lu Qin ),( Kai Li ),( Di Li ),( Guoqing Zhao ),( Longyun Li ) 대한통증학회 2021 The Korean Journal of Pain Vol.34 No.3

Background: Postoperative pain management is crucial for patients undergoing total knee arthroplasty (TKA). There have been many recent clinical trials on post-TKA peripheral nerve block; however, they have reported inconsistent findings. In this meta-analysis, we aimed to comprehensively analyze studies on post-TKA analgesia to provide evidence-based clinical suggestions. Methods: We performed a computer-based query of PubMed, Embase, the Cochrane Library, and the Web of Science to retrieve related articles using neurothe following search terms: nerve block, nerve blockade, chemodenervation, chemical neurolysis, peridural block, epidural anesthesia, extradural anesthesia, total knee arthroplasty, total knee replacement, partial knee replacement, and others. After quality evaluation and data extraction, we analyzed the complications, visual analogue scale (VAS) score, patient satisfaction, perioperative opioid dosage, and rehabilitation indices. Evidence was rated using the Grading of Recommendations Assessment, Development, and Evaluation approach. Results: We included 16 randomized controlled trials involving 981 patients (511 receiving peripheral nerve block and 470 receiving epidural block) in the final analysis. Compared with an epidural block, a peripheral nerve block significantly reduced complications. There were no significant between-group differences in the postoperative VAS score, patient satisfaction, perioperative opioid dosage, and rehabilitation indices. Conclusions: Our findings demonstrate that the peripheral nerve block is superior to the epidural block in reducing complications without compromising the analgesic effect and patient satisfaction. Therefore, a peripheral nerve block is a safe and effective postoperative analgesic method with encouraging clinical prospects.

Modeling and Design Adaptive Double Neural Network Controller for Eight-Rotor Micro Aircraft Vehicle

Di Li,Zhihong Lu,Xiang-jian Chen 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.11

In this article, a dynamic model of a six degrees of freedom (6 DOF) Eight-Rotor MAV (micro aerial vehicles) is derived on the basis of the Newton-Euler formalism. The derivation comprises determining equations of the motion of the Eight-Rotor MAV in three dimensions and approximating the actuation forces through the modelling of aerodynamic coefficients and electric motor dynamics. For Eight-Rotor MAV is inherently unstable as they are highly sensitive to external perturb, here provides an adaptive double neural network controller for the motion control of the Eight-Rotor MAV autonomous flight. This controller is developed in three parts around each of the variables. The experimental results show that the proposed adaptive double neural network controller outperforms the conventional PID controller due to its fast adaptive qualities in the presence of sensor measurement noise and the parameters variations of Eight-Rotor MAV.

Feasibility of Atmospheric-Pressure CO Cold Plasma for Reduction of Supported Metal Ions

Di, L.,Zhang, X.,Lee, B.,Lu, P.,Ahn, W. S.,Park, D. W. Springer Science + Business Media 2017 Plasma chemistry and plasma processing Vol.37 No.6

<P>An atmospheric pressure (AP) carbon monoxide (CO) cold plasma method was developed and employed to reduce supported metal ions for the first time. HAuCl4, AgNO3, H2PtCl6, and Pd(NO3)(2) ions supported on a commercial sample of TiO2 (Degussa P25) were reduced by AP CO cold plasma. The results of UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS) and X-ray photoelectron spectroscopy (XPS) indicate that the supported metal ions are reduced to their metallic states. Au/P25-CP and Au/P25-HP were prepared by CO and H-2 cold plasma, respectively, to investigate the reduction ability of CO cold plasma. XPS and transmission electron spectroscopy analyses show that the gold nanoparticles in Au/P25-CP and Au/P25-HP exist in the form of metallic gold, and exhibit similar size. Interestingly, a blue shift of the surface plasmon resonance peak was observed for Au/P25-CP because of the amorphous carbon formed by CO dissociation. In situ optical emission spectrum of the CO cold plasma was recorded and excited CO molecules were deemed to be the reducing agents. CO cold plasma was also adopted to reduce P25 supported copper ions, while metallic copper nanoparticles were obtained accompanied by a certain amount of oxidized copper species. AP CO cold plasma is as effective as H-2 plasma for reducing supported metal ions, and has great potential for tuning the SPR absorption.</P>

Experimental and theoretical analysis of element mercury adsorption on Fe3O4/Ag composites

Lu Dong,Jiangkun Xie,Guangping Fan,Yaji Huang,Jun Zhou,Qingke Sun,LiangWang,Zhengwen Guan,Di Jiang,Ye Wang 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.11

A novel magnetic nano-sorbent Fe3O4/Ag was synthesized and applied to capture the elemental mercury from the simulated flue gas. The morphology, components and crystal phase of the sorbents were characterized by transmission electron microscope (TEM), energy dispersive spectrometry (EDS) and X-ray diffraction (XRD), respectively. The mercury removal performance of the sorbents was investigated through the fixed-bed tests. The results indicated that silver was successfully loaded on the surface of Fe3O4 particles, which could significantly enhance the Hg0 removal performance of the sorbents. Flue gas components, including CO2, SO2, and NO, have little impact on the Hg0 removal performance of Fe3O4/Ag sorbents, while O2 has a slightly positive effect. The Hg0 removal efficiency decreased with the increasing of temperature, Hg0 inlet concentration and gas hourly space velocity. Only one broad mercury desorption peak at approximately 210 oC could be observed during the temperature-programmed desorption (TPD) process, which indicated that mercury species existing on the surface of Fe3O4/Ag sorbents might be elemental mercury instead of oxidized mercury. Furthermore, the reusability tests showed that the Fe3O4/Ag sorbents could be efficiently regenerated and reused. Finally, the theoretical analysis based on the DFT method showed that a weak chemisorption of Hg0 on Fe3O4 sorbents changed to a strong chemisorption when silver was loaded. The results of theoretical analysis conformed to the experiments results well.

Relationship between ICT supporting conditions and ICT application in Chinese urban and rural basic education

Di Wu,Cong‑Cong L,Wen‑Ting Zhou,Chin‑Chung Tsai,Chun Lu 서울대학교 교육연구소 2019 Asia Pacific Education Review Vol.20 No.1

To investigate the relationships between schools’ ICT supporting conditions and ICT application, a total of 2567 primary and secondary schools from 47 prefecture-level cities were surveyed. The questionnaire was administered to collect the ICT supporting conditions in school (ISCS) and the ICT application in school (IAIS) for each school. Among the ISCS factors, the ICT Environment and School Scale were indicated as being significant predictors of IAIS. In addition, the significant predictive relationship between the ISCS and the IAIS factors for rural schools was much stronger than for urban schools. This indicates that the rural and urban schools in China are now at different ICT development stages. Furthermore, rural schools should focus on the improvement of physical ICT infrastructure and the quality digital resources, whereas urban schools should try to improve teachers’ inadequate epistemic beliefs and design thinking ability. Nevertheless, there are other external and individual-level factors that could directly and indirectly influence schools’ ICT application in education.

Vibration behavior of trapezoidal sandwich plate with functionally graded-porous core and graphene platelet-reinforced layers

Di Liang,Qiong Wu,Xuemei Lu,Vahid Tahouneh 국제구조공학회 2020 Steel and Composite Structures, An International J Vol.36 No.1

In this study, free vibration behavior of trapezoidal sandwich plates with porous core and two graphene platelets (GPLs) reinforced nanocomposite outer layers are presented. The distribution of pores and GPLs are supposed to be functionally graded (FG) along the thickness of core and nanocomposite layers, respectively. The effective Young’s modulus of the GPL-reinforced (GPLR) nanocomposite layers is determined using the modified Halpin-Tsai micromechanics model, while the Poisson’s ratio and density are computed by the rule of mixtures. The FSDT plate theory is utilized to establish governing partial differential equations and boundary conditions (B.C.s) for trapezoidal plate. The governing equations together with related B.C.s are discretized using a mapping- generalized differential quadrature (GDQ) method in the spatial domain. Then natural frequencies of the trapezoidal sandwich plates are obtained by GDQ method. Validity of current study is evaluated by comparing its numerical results with those available in the literature. A special attention is drawn to the role of GPLs weight fraction, GPLs patterns of two faces through the thickness, porosity coefficient and distribution of porosity on natural frequencies characteristics. New results show the importance of this permeates on vibrational characteristics of porous/GPLR nanocomposite plates. Finally, the influences of B.C.s and dimension as well as the plate geometry such as face to core thickness ratio on the vibration behaviors of the trapezoidal plates are discussed.

Enhanced Photocatalytic Activity and Selectivity of a Novel Magnetic PW@PEDOT Imprinted Photocatalyst with Good Reproducibility

Ziyang Lu,Zehui Yu,Jinbo Dong,Xinyu Xiong,Lin Gao,Minshan Song,Yang Liu,Di Fan,Yongsheng Yan,Pengwei Huo 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.2

The novel magnetic PW-doped PEDOT (PW@PEDOT) imprinted photocatalyst with good reproducibility was prepared by the surface imprinting technique and microwave heating method. Due to the existence of PW@PEDOT and imprinted cavity in the imprinted layer, the as-prepared magnetic PW@PEDOT imprinted photocatalyst not only had higher photocatalytic activity, but also had the excellent specific recognition ability for selective photodegradation of TC. This paper proposed a new idea to prepare the imprinted photocatalysts.

Proteomic Analysis of the Triglyceride-Rich Lipoprotein-Laden Foam Cells

Yanjun Lu,Jianli Guo,Yong Di,Yiqiang Zong,Shen Qu,Jun Tian 한국분자세포생물학회 2009 Molecules and cells Vol.28 No.3

In hypertriglyceridaemic individuals, atherosclerogenesis is associated with the increased concentrations of very low density lipoprotein (VLDL) and VLDL-associated rem-nant particles. In vitro studies have suggested that VLDL induces foam cells formation. To reveal the changes of the proteins expression in the process of foam cells formation induced by VLDL, we performed a proteomic analysis of the foam cells based on the stimulation of differentiated THP-1 cells with VLDL. Using two-dimensional gel electro-phoresis (2-DE) and matrix-assisted laser-desorption ioni-zation time-of-flight mass spectrometry (MALDI-TOF MS) analysis, 14 differentially expressed proteins, containing 8 up-regulated proteins and 6 down-regulated proteins were identified. The proteins are involved in energy metabolism, oxidative stress, cell growth, differentiation and apoptosis, such as adipose differentiation-related protein (ADRP), enolase, S100A11, heat shock protein 27 and so on. In addition, the expression of some selected proteins was confirmed by Western blot and RT-PCR analysis. The re-sults suggest that VLDL not only induces lipid accumula-tion, but also brings about foam cells diverse characteris-tics by altering the expression of various proteins.

An Evaluation Framework for the Public Information Guidance System

Linjun Lu,Ziyuan Gu,Di Huang,Zhiyuan Liu,Jun Chen 대한토목학회 2017 KSCE Journal of Civil Engineering Vol.21 No.5

The public information guidance system is of considerable significance to the proper operation of regional public facilities. Despite relevant standards and studies, limited evaluation frameworks are currently available that focus on an analytical multidimensional approach to assess the system performance. This paper aims to propose such an evaluation framework to facilitate the design and improvement of the public information guidance system. Sixteen evaluation factors are selected, quantified and normalized, based on which a hierarchical structure is proposed and a composite evaluation index is developed as the representative of the system performance. The public information guidance system in the Suzhou zoo is taken to demonstrate the feasibility and effectiveness of the proposed approach.