Dynamics of Nonlinear System Based on a CMOS Array Circuit with Quantized Internal States

Jun Qi Zhu,Katsufusa Shono 대한전자공학회 1994 대한전자공학회 세미나 Vol.1994 No.-

Inhibition of quorum sensing, biofilm, and spoilage potential in Shewanella baltica by green tea polyphenols

Junli Zhu,Xuzheng Huang,Fang Zhang,Lifang Feng,Jianrong Li 한국미생물학회 2015 The journal of microbiology Vol.53 No.12

We investigated the quorum sensing (QS) system of Shewanella baltica and the anti-QS related activities of green tea polyphenols (TP) against spoilage bacteria in refrigerated large yellow croaker. Autoinducer-2 (AI-2) and the diketopiperazines (DKPs) cyclo-(L-Pro-L-Leu) and cyclo-(L-Pro-L-Phe) were detected in the culture extract of S. baltica XH2, however, no N-acylhomoserine lactones (AHLs) activity was observed. Green TP at sub-inhibitory concentrations interfered with AI-2 and DKPs activities of S. baltica without inhibiting cell growth and promoted degradation of AI-2. The green TP treatment inhibited biofilm development, exopolysaccharide production and swimming motility of S. baltica in a concentration- dependent manner. In addition, green TP decreased extracellular protease activities and trimethylamine production in S. baltica. A transcriptional analysis showed that green TP repressed the luxS and torA genes in S. baltica, which agreed with the observed reductions in QS activity and the spoilage phenotype. Epigallocatechin gallate (EGCG)-enriched in green TP significantly inhibited AI-2 activity of S.baltica. These findings strongly suggest that green TP could be developed as a new QS inhibitor for seafood preservation to enhance shelf life.

Design and Optimization of a New Half Direct-Driven MW-Scale Axial Flux Permanent Magnet Generator for Wind Turbine

Zhu Jun,Nan Huaichun,Guo Xiangwei,Liu Penghui,Du Shaotong,Yang Ming 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.5

This paper designs a new MW-scale half direct-driven axial flux permanent magnet generator (HDDAFPMG), which incorporates the merits of compact structure and high power density.In order to improve the output voltage quality of the generator,a multi-objective optimization method of parameter hierarchical optimization mechanism and NSGA-II is used to optimize the key design parameters of the generator.By comparing the performance of initial and optimization model using Finite Element Method (FEM), it is found that the output voltage quality of the optimization model is significantly improved.In addition,the Halbach permanent magnet (PM) array is used to decrease the total harmonic distortion (THD) of voltage waveform and decrease the thickness of back iron.It is concluded that the generator with 60° magnetized Halbach PM array can decrease the THD of voltage waveform decreases from 2.27% to 0.46% and decrease the thickness of back iron from 36 mm to 15 mm, which is reduced by 58.33%.

Preparation of Flame Retardant and Antibacterial Wood with Composite Membrane Coating

( Jun-xian Xu ),( Yang Liu ),( Ming-yu Wen ),( Hee-jun Park ),( Jia-zhi Zhu ),( Yu-nan Liu ) 한국목재공학회 2021 목재공학 Vol.49 No.6

A novel flame retardant and antibacterial composite membrane coating for wood surfaces was prepared by adding POSS-based phosphorous nitrogen flame retardant (later referred to as NH₂-POSS) and silver nanoparticles (Ag NPs) to chitosan (CS). The effects of NH₂-POSS content (mass fractions of CS 0%, 0.5%, 1%, 3%, 5%, and 7%) on the structure and properties of the composite membrane coating on wood were investigated. The composite film was prepared by the method of blending and ducting. Contact angle, tensile property and antibacterial effects of the composite film were measured, and infrared spectroscopy was used. The results show that the addition of NH₂-POSS can not only improve the toughness of the membrane, but also the flame retardancy of the membrane, which improves the application of the membrane in wood products. However, with the addition of NH₂-POSS, the transparency of the composite membrane was weakened. The inhibitory effect of the composite membrane on the growth of Escherichia coli was enhanced with the increase in Ag NPs. This research provides a foundation for the application of functional wood.

An eigenspace projection clustering method for structural damage detection

Jun-hua Zhu,Ling Yu,Li-li Yu 국제구조공학회 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.44 No.2

An eigenspace projection clustering method is proposed for structural damage detection by combining projection algorithm and fuzzy clustering technique. The integrated procedure includes data selection, data normalization, projection, damage feature extraction, and clustering algorithm to structural damage assessment. The frequency response functions (FRFs) of the healthy and the damaged structure are used as initial data, median values of the projections are considered as damage features, and the fuzzy c-means (FCM) algorithm are used to categorize these features. The performance of the proposed method has been validated using a three-story frame structure built and tested by Los Alamos National Laboratory, USA. Two projection algorithms, namely principal component analysis (PCA) and kernel principal component analysis (KPCA), are compared for better extraction of damage features, further six kinds of distances adopted in FCM process are studied and discussed. The illustrated results reveal that the distance selection depends on the distribution of features. For the optimal choice of projections, it is recommended that the Cosine distance is used for the PCA while the Seuclidean distance and the Cityblock distance suitably used for the KPCA. The PCA method is recommended when a large amount of data need to be processed due to its higher correct decisions and less computational costs.

Generalized Area Spectral Efficiency of Wireless Ad-hoc Networks over Rayleigh Fading

Jun Zhu,Lei Zhang,Hong-Chuan Yang,Mazen O. Hasna 한국통신학회 2020 Journal of communications and networks Vol.22 No.4

Generalized area spectral efficiency (GASE) was introduced as a metric to quantify the spectral utilization efficiency ofwireless transmissions. Unlike other performance metrics, GASEtakes into account the spatial property of wireless transmissions. In this paper, we extend the research on GASE from link levelto network level. In particular, we consider a wireless ad-hoc network with Poisson distributed nodes. We take into account the cochannel interference and derive the generic closed-form momentgenerating function (MGF) expression of aggregate interferencein such network. With the interference statistics, we calculate theergodic capacity, affected area, and GASE of the network overRayleigh fading channels. Furthermore, we analyze the effect ofcarrier sense multiple access with collision avoidance (CSMA/CA)mechanism on the GASE performance of such network. Finally,we propose a new cognitive paradigm that allows the secondarytransmitters that are located outside the primary affected area totransmit. With this paradigm, we can achieve high ergodic capacitywhile effectively utilizing the space-spectrum resource of primarynetwork. Besides, through mathematical analysis and numericalexamples, we show that GASE provides a new perspective on transmission power selection and secondary network optimization.

A Model Transfer Learning Based Fault Diagnosis Method for Chemical Processes With Small Samples

Jun-Wei Zhu,Bo Wang,Xin Wang 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.12

Traditional fault diagnosis methods relies on sufficient fault samples, but it is unrealistic since the fault is a low possibility event in real industrial scenes. To address the above issue, this paper proposed a fault diagnosis method for chemical processes with small samples. First, a data self-generating-based transfer learning (DSGTL) method is presented to expand the fault samples. The characteristic of fault data is learned by adversarial relation and transferred to the generated data. Moreover, a model-based transfer learning strategy is adopted to improve the robustness of the proposed method to the quality of generated data. Second, the sample reconstruction-based convolutional neural network (SR-CNN) is proposed which adaptively extracts features from both spatial domain and time domain and identifies the fault type of industrial process with small samples. Finally, the experimental result of the Tennessee Eastman (TE) process proves the validity and the feasibility of the proposed method.

“(是)……的”句中“的”与宾语的位置关系 --以“S(是)AVO的”和“S(是)AV的O”句式为主

Zhu-jun Lian 한국중국언어학회 2022 중국언어연구 Vol.- No.98

“(是)……的”焦点句中宾语可以放在“的”之前,也可以放在“的”之后,我们将前者称为“VO的”句式,后者为“V的O”句式。本文通过语料库考察了以下三种情况:(1)采用“VO的”句式、不采用“V的O”句式的情况,(2)采用“V的O”句式、不采用“VO的”句式的情况,(3)两种句式都可采用的情况。 通过考察我们详细列出了属于(1)和(2)两种情况的语义和句法条件,发现”V的O“句式比”VO的“句式具有更强的构式义,能够把进入其中的不符合条件的V和O强制解读为符合条件的成分。 对于第(3)种情况,本文证实并分析了以下三种倾向性:(A)当“VO”为动宾式离合词时,人们倾向于采用“V的O”句式,(B)当宾语为代词时,人们倾向于采用“VO的”句式,(C)当动词后同时出现结果补语和宾语时,人们倾向于采用“VO的”句式,不管宾语是特指性成分还是泛指性成分。此外,我们还发现话者的态度也会影响到选择哪种句式。当话者对言及的事件十分在意时,往往会采用“VO的”句式,而当话者要客观陈述某个事件或对某个事件不太在意时,则往往采用“V的O”句式。因为存在这种区别,这两种句式在对话语体中会带来不同的语用效果:采用“VO的”句式可以让话者的言语带上某种比较强烈的感情,而采用“V的O”句式则会拉开话者与听者的距离,使话者听起来显得冷淡、冷漠。

Clinicopathological characteristics, treatment and outcomes in uterine carcinosarcoma and grade 3 endometrial cancer patients: a comparative study

Jun Zhu,Hao Wen,Rui Bi,Xiaohua Wu 대한부인종양학회 2016 Journal of Gynecologic Oncology Vol.27 No.2

Objective: Uterine carcinosarcoma (UCS) shared the same staging system with endometrial carcinoma in the International Federation of Gynecology and Obstetrics 2009. The aim of the present study was to compare the clinicopathological and prognostic characteristics between UCS and grade 3 endometrioid endometrial carcinoma (G3EC). Methods: A retrospective analysis of 60 UCS and 115 G3EC patients with initial treatment at the Department of Gynecology in the Fudan University Shanghai Cancer Center between February 2006 and August 2013. Chi-square analysis was used to compare differences between variables. Prognostic factors were determined using univariate/multivariate analysis, and the survival rates were assessed using the Kaplan-Meier method. The Cox regression model was used to assess the independent prognostic factor. Results: UCS had significantly worse overall survival (OS) compared with G3EC. Carcinosarcoma subtype was an independent factor (hazard ratio [HR], 2.4; 95% confidence interval [CI], 1.0 to 5.8; p=0.039), stratified based on stage. Compared with G3EC, UCS patients had a greater incidence of ascites fluid (55.0% vs. 15.7%, p<0.001) and adnexal involvement (20.0% vs. 8.7%, p=0.048) and larger median tumor volume (4.6 cm vs. 4.0 cm, p=0.046). Subgroup analysis of the prognostic factors revealed that UCS patients exhibited worse OS than G3EC patients in such specific subgroups as patients at younger ages, with postmenopausal status, without ascites fluid, with early stage diseases, without vagina invasion, without lymph node metastases and receiving adjuvant chemo/radiotherapy. Adjuvant radiotherapy with chemotherapy was predictive of better survival in UCS patients compared with chemotherapy or radiotherapy alone (5-year OS, 71.0% vs. 35.8%, p=0.028). Multivariate Cox regression revealed that tumor mesenchymal component (HR, 4.6; 95% CI, 1.4 to 15.8; p=0.014) was an independent prognostic factor for UCS, whereas advanced stages (HR, 5.9; 95% CI, 1.0 to 33.9; p=0.046) and ascites fluid (HR, 5.1; 95% CI, 1.1 to 22.7; p=0.032) were independently correlated with poor prognosis for G3EC patients. Conclusion: The distinctions in both clinicopathological and prognostic characteristics between UCS and G3EC suggest that this subtype should be treated separately from high-risk epithelial endometrial carcinoma.

Fault-tolerant Control for Linear System Under Sensor Saturation Constraint

Jun-Wei Zhu,Qiao-Qian Zhou,Jianming Xu,Jian-Wei Dong 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.1

An observer-based fault-tolerant control method is proposed for a linear system with sensor saturationconstraint. Considering the linear system with simultaneous actuator faults and sensor faults, the sensor saturation would bring the output measurement error of the system, which would result in the estimation performancedegradation. Firstly, the intermediate estimator is modified to estimate the system states and fault signals at thesimultaneous time, and the fault-tolerant controller is designed based on the estimation to compensate the effectof actuator faults effectively. Through Lyapunov stability analysis, the sufficient conditions are obtained to ensurethe states of closed-loop system to be uniformly ultimately bounded. The effect of sensor saturation error can besuppressed by adjusting some specified parameters directly without introducing any performance index. Finally, theeffectiveness and superiority of the proposed method are verified by a simulation example