Implementation of online model updating with ANN method in substructure pseudo-dynamic hybrid simulation

Yan Hua Wang,Jing Lv,Yan Feng,Bo Wen Dai,Cheng Wang,Jing Wu,Zi Yan Chen 국제구조공학회 2021 Smart Structures and Systems, An International Jou Vol.28 No.2

Substructure pseudo-dynamic hybrid simulation (SPDHS) is an advanced structural seismic testing method which combines physical experiment and numerical simulation. Generally, the key components which display nonlinearity first are taken as experimental substructures for actual test, and the remaining parts are modeled in simulation. Model updating techniques can be effectively applied to enhance the model precision of nonlinear numerical elements. Specifically, the constitutive model of the experimental substructure is identified online by the instantaneously-measured data, and the corresponding numerical elements with similar hysteretic behaviors are updated synchronously. Artificial neural network (ANN) can recognize the system which cannot be represented by definite numerical model, and thus avoids the structural response distortion caused by the inherent numerical model defects. In this study, a framework for online model updating in SPDHS with ANN method is expanded to implement actual test validation. Moreover, the effectiveness of ANN method is demonstrated by practical tests of a two-story frame model with bending dampers. Additionally, the unscented Kalman filter technique and offline ANN identification approach are both examined in the test validation. The experimental results show that, under the identical loading history, the online ANN method can significantly reduce the model errors and improve the accuracy of SPDHS.

Anti-inflammatory effect of Allium hookeri in the OVA-induced allergic rhinitis mouse model

Yan Jing Fan,Chun Hua Piao,Thi Van Nguyen,Ji Hyun Kim,Eui Hyeog Han,Hyoung Tae Kim,Yun Ho Choi,Ok Hee Chai,Chang Ho Song 대한체질인류학회 2019 대한체질인류학회 학술대회 연제 초록 Vol.62 No.-

Wireless Network based Formation Control for Multiple Agents

Jing Yan,Xian Yang,Xiao-yuan Luo,Xin-Ping Guan,Chang-chun Hua 제어·로봇·시스템학회 2014 International Journal of Control, Automation, and Vol.12 No.2

Motivated by the potentially application merits of wireless networked control systems (WNCSs), this paper presents a network-based formation framework for multi-agent systems. First, we construct a discrete formation protocol by integrating 802.11b. Meanwhile, one agent is considered as the reference, and the other ones keep a desired formation with the reference via communication net-works. Using Lyapunov stability theory, sufficient convergence conditions are derived, and the verifi-cation problem of the sufficient conditions can be transformed as a linear matrix inequality (LMI) feasibility problem. Solving this LMI feasibility problem, a networked-based feedback controller can be easily obtained. Finally, simulation studies are provided to demonstrate the effectiveness of the pro-posed method.

Design and Implementation of Secure Cloud Storage System Based on Elliptic Encryption

Jing Yan,Zhi-heng Lin,Yong-zhen Li ASCONS 2021 IJASC Vol.3 No.1

Background/Objectives: With the rapid development of Internet technology, more and more Internet users tend to store their data and information in the cloud, and the security of the existing cloud storage system has been criticized by people, which is not conducive to protecting the data and information security of users. Therefore, how to effectively guarantee the security of cloud user data becomes more and more important. Security cloud storage system is the key to solve this problem. Methods/Statistical analysis: A secure cloud storage system is implemented for the user’s cloud data security. Its main function is: in the user login phase, the strict user identity authentication method is adopted to control the user’s access rights and prevent illegal users from logging in. Firstly, the identify authentication scheme based on zero knowledge proof is proposed. Secondly, in the user data upload stage, the user data is split. Finally, the encryption algorithm based on elliptic curve is proposed to encrypt the user’s file splitting table. Findings: The experimental results show that, in the user identify authentication stage, compared with the traditional user authentication method, the security of user identify authentication can be greatly improved by using the identify authentication method based on zero-knowledge proof. Improvements/Applications: The secure cloud storage system based on ellipse encryption developed in this thesis can realize the security of user's data by encryption while considering the efficiency of data upload and download, and has a broad application prospect.

Freestanding supercapacitor electrode applications of carbon nanofibers based on polyacrylonitrile and polyhedral oligomeric silsesquioxane

Yan, Jing,Choi, Jae-Hak,Jeong, Young Gyu Elsevier 2018 Materials & Design Vol.139 No.-

<P><B>Abstract</B></P> <P>The microstructures and electrochemical performance of polyacrylonitrile/polyhedral oligomeric silsesquioxane (PAN/POSS)-derived carbon nanofibers (CNFs) were investigated in terms of POSS content (0–60wt%) and activation process for their potential utilization as freestanding supercapacitor electrodes. For the purpose, a series of CNFs were manufactured by stabilization and carbonization of electrospun PAN/POSS nanofibers. The CNFs were then activated by potassium hydroxide (KOH) treatment to etch carbon and by hydrofluoric acid (HF) treatment to remove the POSS filler. Scanning electron microscopic images and energy dispersive X-ray spectra of PAN/POSS-based CNFs revealed the efficient removal of the POSS filler by KOH and HF treatments. The effect of POSS content on the porous structures of KOH/HF-treated CNFs was also confirmed by the specific surface area and pore size distribution analyses. The electrochemical performance of the CNFs was evaluated by using cyclic voltammetry (CV) and galvanostatic charge/discharge (GCD) test. KOH/HF-treated CNFs, which were fabricated from electrospun nanofibers with 40wt% POSS, were found to have high specific capacitance of 257.7Fg<SUP>−1</SUP> at a scan rate of 5mVs<SUP>−1</SUP> and 116.9Fg<SUP>−1</SUP> at 100mVs<SUP>−1</SUP>. The GCD results demonstrated that the CNFs have high specific capacitance of 138.7Fg<SUP>−1</SUP>, energy density of 12.2Whkg<SUP>−1</SUP>, and power density of 79.6Wkg<SUP>−1</SUP>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Precursor nanofibers were prepared by electrospinning of PAN/POSS solutions. </LI> <LI> Carbon nanofibers (CNFs) were fabricated by carbonizing the precursor nanofibers. </LI> <LI> KOH and HF treatments were effective for activating CNFs. </LI> <LI> Activated CNFs can serve as self-standing high performance supercapacitor electrodes. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Patterns of endoscopy during COVID-19 pandemic: a global survey of interventional inflammatory bowel disease practice

( Yan Chen ),( Qiao Yu ),( Francis A. Farraye ),( Gursimran S. Kochhar ),( Charles N. Bernstein ),( Udayakumar Navaneethan ),( Kaicun Wu ),( Jie Zhong ),( David A. Schwartz ),( Hao Wu ),( Jing-jing Zh 대한장연구학회 2021 Intestinal Research Vol.19 No.3

Background/Aims: Performance of diagnostic or therapeutic endoscopic procedures in inflammatory bowel disease (IBD) patients can be challenging during a viral pandemic; the main concerns being the safety and protection of patients and health care providers (HCP). The aim of this study is to identify endoscopic practice patterns and outcomes of IBD and coronavirus disease 19 (COVID-19) with a worldwide survey of HCP. Methods: The 20-item survey questionnaire was sent to physician members of the American Society for Gastrointestinal Endoscopy Special Interest Group in Interventional IBD, Chinese IBD Society Endoscopy Interest Group, and the China Crohn’s and Colitis Foundation. Results: A total of 141 respondents submitted valid responses. Nighty-five respondents (67.9%) reported that at least 25% of their scheduled emergent endoscopic procedures were canceled or postponed during the pandemic. Fifty-six respondents (40.0%) have performed emergent endoscopy during the pandemic. A few respondents (9/140, 6.4%) estimated that more than 25% of their patients had worsened disease due to delayed or canceled emergent endoscopy procedures. More than 80% of respondents believed that personal protective equipment (PPE) for the endoscopy team, room sterilization, and pre-procedure screening of patients for COVID-19 were necessary. Out of 140 respondents, 16 (11.4%) reported that several of their patients had COVID-19. Eight clinicians (5.7%) reported that they or their endoscopy colleagues developed work-related COVID-19. Conclusions: Cancellation of elective and emergent endoscopy in IBD care during the pandemic was common. Few respondents reported that their patients’ disease conditions worsened due to the cancellation of the endoscopy procedure. Most respondents voiced the need for proper PPE during the procedure regardless of patients’ COVID-19 status and screening the patients for COVID-19. (Intest Res 2021;19:332-340)

Gallic Acid alleviates inflammation in an OVA-induced allergic rhinitis mouse model by regulating of Th1/Th2/Th17 cytokines production

Yan Jing Fan,Eui-Hyeog Han,Hyoung-Tae Kim,Chang Ho Song,Ok Hee Chai 대한체질인류학회 2018 대한체질인류학회 학술대회 연제 초록 Vol.61 No.-

Allium hookeri Inhibits Inflammation in OVA-induced Allergic Rhinitis in Mice via NF-κB Pathway

Yan Jing Fan,Juan Jin,Chun Hua Piao,Thi Van Nguyen,김유석,채옥희,송창호 대한체질인류학회 2023 해부·생물인류학 (Anat Biol Anthropol) Vol.36 No.3

Allium hookeri (A. hookeri) has been used as a traditional medicine for many years in the Southeast Asian region. Multiple investigations have demonstrated its role in preventing of microbial infection, immune regulation, coronary thrombosis, and atherosclerosis has been demonstrated by several studies. Therefore, this study aims to investigate the suppressing effect of A. hookeri on the ovalbumin (OVA)-induced allergic rhinitis (AR) murine model. In this study, AR was induced in BALB/c mice by using OVA emulsified in aluminum on days 1, 8 and 15. Then, nasally challenged with OVA on days 22 to 28. On days 16 to 28, OVA-induced mice were treated either with A. hookeri (50, 100, 200 mg/kg) or Dexamethasone (Dex, 2.5 mg/kg) by oral gavage. On days 22 to 28, mice received either A. hookeri (50, 100, 200 mg/kg) or Dexamethasone (Dex, 2.5 mg/kg) an hour before the OVA challenge. The mice in the control group were not sensitized, treated, or tested. In this study, A. hookeri ameliorated nasal symptoms include rubbing and sneezing; reduced thickness of nasal mucosa; alleviated goblet cell hyperplasia and eosinophil infiltration in the nasal mucosa; decreased levels of OVA-specific IgE and OVA-specific IgG1 in serum; and suppressed Th2 (IL-4, IL-5, and IL-13) cytokines level in nasal lavage fluid (NALF). In addition, A. hookeri recovered the production of Th1 (IL-12 and IFN-γ) cytokines level in NALF, inhibited the inflammation through NF-κB pathway. Collectively, our results suggest that A. hookeri effectively protects against AR by regulating Th1/Th2 cytokines imbalance and NF-κB mechanisms. These observations suggest A. hookeri as a potential therapeutic option for AR.

By the Translators’ Discretion: A Study of Xíngshì yán into Hangeul

Jing Yan,조지은 한국학중앙연구원 한국학중앙연구원 2020 THE REVIEW OF KOREAN STUDIES Vol.23 No.1

This paper examines the transmission of Xíngshì yán in Joseon Korea and the roles of the translator in late Joseon literary culture. Through a comparative study of the Chinese vernacular short story collection, Xíngshì yán 型世言, alongside its Korean translation, we show how the translator in question went further than simply transferring the text from Chinese to Korean. Rather, the translator also acted as a text moderator and an editor, domesticating the text for its readers, mainly royal and gentry women. In the capacity as a textmoderator, the translator made a creative contribution in reconstructing the narrative style and in the use of lexical items and speech style. Simultaneously, as an editor, the translator omitted parts of the text that required an advanced contextual knowledge of Chinese language or culture to comprehend, while also adapting parts of the text that relate to story background, conversations between characters, description of story details, and characters’ psychological processes. Drawing upon Skopos theory, we argue that the act of translating Xíngshì yán was motivated by the goal of presenting the story to a new audience, that is royal and gentry women.

Therapeutic effects of lysophosphatidylcholine in experimental sepsis

Yan, Ji-Jing,Jung, Jun-Sub,Lee, Jung-Eun,Lee, Jongho,Huh, Sung-Oh,Kim, Hee-Sung,Jung, Kyeong Cheon,Cho, Jae-Young,Nam, Ju-Suk,Suh, Hong-Won,Kim, Yung-Hi,Song, Dong-Keun Nature Publishing Group 2004 Nature medicine Vol.10 No.2

Sepsis represents a major cause of death in intensive care units. Here we show that administration of lysophosphatidylcholine (LPC), an endogenous lysophospholipid, protected mice against lethality after cecal ligation and puncture (CLP) or intraperitoneal injection of Escherichia coli. In vivo treatment with LPC markedly enhanced clearance of intraperitoneal bacteria and blocked CLP-induced deactivation of neutrophils. In vitro, LPC increased bactericidal activity of neutrophils, but not macrophages, by enhancing H<SUB>2</SUB>O<SUB>2</SUB> production in neutrophils that ingested E. coli. Incubation with an antibody to the LPC receptor, G2A, inhibited LPC-induced protection from CLP lethality and inhibited the effects of LPC in neutrophils. G2A-specific antibody also blocked the inhibitory effects of LPC on certain actions of lipopolysaccharides (LPS), including lethality and the release of tumor necrosis factor-α (TNF-α) from neutrophils. These results suggest that LPC can effectively prevent and treat sepsis and microbial infections.