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Ignition Pattern Analysis for Automotive Engine Trouble Diagnosis Using Wavelet Packet Transform and Support Vector Machines

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Chinese Journal of Mechanical Engineering 2011年第5期24卷 870-878页

作者： VONG Chi-man wong Pak-kin TAM Lap-mou ZHANG Zaiyong Department of Computer and Information Science Faculty of Science and Technology University of Macao Macao China Department of Electromechanical Engineering Faculty of Science and Technology University of Macao Macao China

Engine spark ignition is an important source for diagnosis of engine *** on the waveform of the ignition pattern,a mechanic can guess what may be the potential malfunctioning parts of an engine with his/her experience and ***,this manual diagnostic method is imprecise because many spark ignition patterns are very ***,a diagnosis needs many trials to identify the malfunctioning *** the mechanic needs to disassemble and assemble the engine parts for *** tackle this problem,an intelligent diagnosis system was established based on ignition ***,the captured patterns were normalized and *** wavelet packet transform（WPT） was employed to extract the representative features of the ignition ***,a classification system was constructed by using multi-class support vector machines（SVM） and the extracted *** classification system can intelligently classify the most likely engine fault so as to reduce the number of diagnosis *** results show that SVM produces higher diagnosis accuracy than the traditional multilayer feedforward neural *** is the first trial on the combination of WPT and SVM to analyze ignition patterns and diagnose automotive engines.

关键词： automotive engine ignition pattern diagnosis pattern classification wavelet packet transform support vector machines.

Multi scale risk measurement in electricity market:a wavelet based value at risk approach

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Journal of Southeast University(English Edition) 2008年第S1期24卷 54-59页

作者： Guu Sy-ming Lai kin Keung College of Management Yuan Ze University School of Business Administration Hunan University

Value at risk (VaR) is adopted to measure the risk level in the electricity market. To estimate VaR at higher accuracy and reliability, the wavelet variance decomposed approach for value at risk estimates (WVDVaR) is proposed. Empirical studies conduct in five Australian electricity markets, which evaluate the performances of both the proposed approach and the traditional ARMA-GARCH approach using the Kupiec backtesting procedure. Experimental results suggest that the proposed approach measures electricity market risks at higher accuracy and reliability than the bench mark ARMA-GARCH approach, as indicated by the higher p values during the Kupiec backtesting procedure. In addition, the new approach also provides more insight into the risk evolution process over time and helps in adjusting VaR estimates to the time horizons that best suit investor interests. The distribution of risk according to investor preferences is shown by decomposing VaR across different time horizons. This also provides important information for the appropriate aggregation of risk measures based on investor investment preferences.

关键词： wavelet analysis value at risk risk management Australian electricity market

Deep learning for diagnosis of precancerous lesions in upper gastrointestinal endoscopy:A review

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World Journal of Gastroenterology 2021年第20期27卷 2531-2544页

作者： Tao Yan Pak kin wong Ye-Ying Qin School of Mechanical Engineering Hubei University of Arts and ScienceXiangyang 441053Hubei ProvinceChina Department of Electromechanical Engineering University of MacaoTaipa 999078MacaoChina

Upper gastrointestinal(GI)cancers are the leading cause of cancer-related deaths *** identification of precancerous lesions has been shown to minimize the incidence of GI cancers and substantiate the vital role of screening ***,unlike GI cancers,precancerous lesions in the upper GI tract can be subtle and difficult to *** intelligence techniques,especially deep learning algorithms with convolutional neural networks,might help endoscopists identify the precancerous lesions and reduce interobserver *** this review,a systematic literature search was undertaken of the Web of Science,PubMed,Cochrane Library and Embase,with an emphasis on the deep learning-based diagnosis of precancerous lesions in the upper GI *** status of deep learning algorithms in upper GI precancerous lesions has been systematically *** challenges and recommendations targeting this field are comprehensively analyzed for future research.

关键词： Artificial intelligence Deep learning Convolutional neural network Precancerous lesions Endoscopy

Early-onset primary torsional dystonia in a 4-generation Chinese family with a mutation in the DYT1 gene

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Chinese Medical Journal 2005年第10期118卷 873-876页

作者： YEUNG Wai Lan LAM Ching Wan CHENG Wai Tsoi SIN Ngai Chuen wong Wing kin wong Chun Nei TSE Ka ming FOK Tai Fai Departments of Paediatrics Prince of Wales HospitalThe Chinese University of Hong KongHong KongChina Chemical Patholog Prince of Wales HospitalThe Chinese University of Hong KongHong KongChina Department of Paediatrics and Adolescent Medicine Queen Mary HospitalUniversity of Hong Kong Nuclear Medicine&PET Division Scanning DepartmentSt.Teresa’s HospitalHong KongChina

Primary torsion dystonia(PTD)is a clinically and genetically heterogeneous movement *** least thirteen different types of dystonia can be distinguished on a genetic basis.~1 The DYT1 gene was first mapped by Ozelius et al in 1989.~2(Kramer et)al^3 linked the same locus to PTD in 12 Ashkenazi Jewish families in *** patients with early-onset generalized PTD were caused by the same three base pair(GAG)deletion in the DYT1 gene on chromosome 9q34.^(1,4,5)The product of the gene is a protein called torsinA.~5(Although the)function of this protein is as yet uncertain,it is widely distributed throughout the brain with high levels in the substantia nigra compacta dopamine neurones.

关键词： DYT1 gene dystonia positron emission tomography

Static-Output-Feedback Based Robust Fuzzy Wheelbase Preview Control for Uncertain Active Suspensions With Time Delay and Finite Frequency Constraint

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IEEE/CAA Journal of Automatica Sinica 2021年第3期8卷 664-678页

作者： Wenfeng Li Zhengchao Xie Jing Zhao Pak kin wong Hui Wang Xiaowei Wang School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhouand Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced ManufacturingSouth China University of TechnologyGuangzhou 510641China Department of Electromechanical Engineering University of MacaoMacao 999078 Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing South China University of TechnologyGuangzhou 510641China Department of Electromechanical Engineering University of MacaoMacao 999078China School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou 510641China School of Mechanical Engineering and Automation Northeastern UniversityShenyang 110819China

This paper proposes a static-output-feedback based robust fuzzy wheelbase preview control algorithm for uncertain active suspensions with time delay and finite frequency ***,a Takagi-Sugeno(T-S)fuzzy augmented model is established to formulate the half-car active suspension system with consideration of time delay,sprung mass variation and wheelbase preview ***,in view of the resonation between human’s organs and vertical vibrations in the frequency range of 4–8 Hz,a finite frequency control criterion in terms of H∞norm is developed to improve ride ***,other mechanical constraints are also considered and satisfied via generalized H2 ***,in order to maintain the feasibility of the controller despite of some state variables are not online-measured,a two stage approach is adopted to derive a static output feedback ***,numerical simulation results illustrate the excellent performance of the proposed controller.

关键词： Active suspension finite frequency output feedback Takagi-Sugeno(T-S)fuzzy model time delay wheelbase preview

Impact of IPMOE on nursing tasks in the medical ward: A time-motion study

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International Journal of Nursing Sciences 2018年第1期5卷 50-56页

作者： ming Leung Kenny kin Chung Chan Wing Leung wong Alexander Chun Bon Law Princess Margaret Hospital Hong KongChina Tuen Mun Hospital Hong KongChina Hong Kong Baptist University Hong KongChina

Introduction:The In-patient Medication Order Entry System (IPMOE) was first implemented in the medical ward of Princess Margaret Hospital,Hong *** was a local developed close-loop system including prescription,dispensing and administration *** on its impact on nursing tasks would be important for practice improvement and subsequent system ***:The study was conducted to quantify the nursing times across medication-associated tasks for paper-based MAR and computer-based IPMOE,including change in the tasks and time patterns before and after IPMOE ***:This was a prospective observation study in medical wards before (Jan 2014-Jun 2014) and after (Mar 2015-Jun 2015) the implementation of *** conducted 8-hr observation studies of individual nurses with a customized application to time various pre-categorized nursing *** inferences and interrupted time series analysis was performed to identify the change in the intercept and trends over time after ***:The average number of medication-related tasks was significantly reduced from 61.07 to 29.81,a reduction of 31.26 episodes per duty (P < 0.001,95% CI 22.9-39.63).The time for the medication-related tasks was reduced from 32 min (SD =21.57) to 26.57 min (SD =11.35) and the medication administration time increased from 37.93 min (SD-14.78) to 44.37 min (SD 19.45),but there was no overall significant difference in the time spent on each duty (P =0.315) between the two *** improving trend in the delayed effect was observed (P =0.03),which indicated a run-in period for new application was needed in clinical ***:Our study had shown the time motion observation could be applied to measure the impact of the IPMOE in a busy clinical *** classification of activities,validation,objective measurement and longitudinal evaluation,the method could be applied in various systems as well as different clinical settings in

关键词： In-patient medication order entry system Medication systems Nursing Time and motion studies

Design, Synthesis, Photophysical Studies and Electrochemistry of Carbazole-, Oxadiazole-, and Oxadiazole-Triarylamine-Containing Rhenium(Ⅰ) Diimine Alkynyl Complexes

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Chinese Journal of Chemistry 2014年第10期32卷 1015-1021页

作者： Wai-kin Chung Keith Man-Chung wong Vivian Wing-Wah Yam and Department of ChemistryThe University of Hong KongPokfulam RoadHong KongChina

A series of rhenium(I)diimine alkynyl complexes with various electron-and hole-transporting moieties has been synthesized and *** electronic absorption,emission and electrochemical properties have also been studied.

关键词： electrochemistry luminescence metal alkynyl rhenium(Ⅰ)diimine,UV/Vis spectroscopy

Protective effects and microarray-based mechanism of sea cucumber hydrolysates against high-glucose induced nephrotoxicity in mouse glomerulus mesangial cells

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未来食品学报(英文) 2024年第3期4卷 233-240页

作者： Lingxin Geng Jiaojiao Han Jun Zhou Ye Li Tinghong ming Zhen Zhang Chenyang Lu Xiurong Su State Key Laboratory for Quality and Safety of Argo-products School of Marine ScienceNingbo UniversityNingbo 315211China

Diabetic nephropathy(DN)is a common type of end-stage renal disease and glomerular mesangial cells(GMCs)are widely used as a cell model for *** study firstly investigated the inhibitory effects of the Apostichopus japonicus and Acaudina leucoprocta hydrolysates on cellular growth under high-glucose treatment,better inhibitory effect of *** hydrolysate was observed compared to that of *** ***,the global transcription profiles obtained via microarray analysis showed that 6070 and 7015 genes were identified in the *** and *** groups compared with the model group,*** them,transcriptions of the slc30a4,slc35dl,tppp3,tp53inpl,bcl-2,apafl,alox12b and adrala genes were restored from the levels of the model group to those of the control group,contributed to cell mitosis and proliferation in both treatment *** addition,other apoptosis-related genes,such as bcl-6,clu,foxo3 and akt,showed opposite trends between two groups,which might cause the difference in inhibitory *** preliminarily proposed that the regulation effects of *** and *** on the genes involved in cellular mitosis,proliferation and apoptosis,might contribute to their inhibitory activity on GMCs under high-glucose environment.

关键词： Diabetic nephropathy Apostichopus japonicus Acaudina leucoprocta Hydrolysate Rat mesangial cell Microarray

Diffuse Reflectance Fourier Transform Infrared Spectrometry of BN Films Deposited on Steels by Remote Microwave Plasma CVD from Borazine

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Chinese Physics Letters 1996年第4期13卷 309-312页

作者： LEI ming-kai MA Teng-cai V.A.Emel'kin National Laboratory of Material Modification Dalian University of TechnologyDalian 116024 Institute of Thermophysics Siberian Branch of Russian Academy of SciencesNovosibirsk 630090Russia

The diffuse reflectance Fourier trmisfonn infrared spectra of the boron nitride(BN)films deposited on steels by remote microwave plasma chemical vapour deposition(CVD)from borazine with nitrogen,hydrogen and argon were investigated in the wavenumber range of 400-4000 cm^(-1).It was found that the cubic BN for million depends on production of the intermediate species of cyclo triborazane((BH2NH2)3)and its *** structuml bonds of cydotriborazane are similar to that of cubic *** conditions for deposited BN films were found to be the bora,zine-nitrogen mixture at the substrate *** of 550℃.The BN films were n mixture of crystalline cubic BN accounting for the major content and hexagonal BN with relatively low hydrogen content.

关键词： cubic Infrared tempera