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Modeling dual-scale epidemic dynamics on complex networks with reaction diffusion processes

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Journal of Zhejiang University-Science C(Computers and Electronics) 2014年第4期15卷 265-274页

作者： Xiao-gang jin yong MIN AI Institute in College of Computer Science and Technology Zhejiang University College of Computer Science and Technology Zhejiang University of Technology

The frequent outbreak of severe foodborne diseases(e.g., haemolytic uraemic syndrome and Listeriosis) in 2011 warns of a potential threat that world trade could spread fatal pathogens(e.g., enterohemorrhagic Escherichia coli). The epidemic potential from trade involves both intra-proliferation and inter-diffusion. Here, we present a worldwide vegetable trade network and a stochastic computational model to simulate global trade-mediated epidemics by considering the weighted nodes and edges of the network and the dual-scale dynamics of epidemics. We address two basic issues of network structural impact in global epidemic patterns:(1) in contrast to the prediction of heterogeneous network models, the broad variability of node degree and edge weights of the vegetable trade network do not determine the threshold of global epidemics;(2) a ‘penetration effect', by which community structures do not restrict propagation at the global scale, quickly facilitates bridging the edges between communities, and leads to synchronized diffusion throughout the entire network. We have also defined an appropriate metric that combines dual-scale behavior and enables quantification of the critical role of bridging edges in disease diffusion from widespread trading. The unusual structure mechanisms of the trade network model may be useful in producing strategies for adaptive immunity and reducing international trade frictions.

关键词： Worldwide trade networks Foodbome diseases Scale-free networks Mean-field analysis

Clinicopathological features of familial adenomatous polyposis in Korean patients

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World Journal of Gastroenterology 2016年第17期22卷 4380-4388页

作者： Sung Min jung yong Sik Yoon Seok-Byeong Lim Chang Sik Yu jin Cheon Kim Division of Colon and Rectal Surgery Department of Surgery University of Ulsan College of Medicine Seoul 05505 South Korea Asan Medical Center Seoul 05505 South Korea

AIM: To identify prognostic factors and to correlate APC mutations with clinical features, including extracolic manifestations. METHODS: One hundred thirty-five patients who underwent surgical procedures for familial adenomatous polyposis(FAP) were included. FAP was diagnosed when the number of adenomatous polyps was > 100. Data related to patient, extracoloic manifestations, cancer characteristics, operative procedure, follow up and surveillance were collected. APC mutation testing was performed in the 30 most recent patients. DNA was extracted from peripheral blood and polymerase chain reaction products using 31 primer pairs on APC gene were sequenced. A retrospective study was performed to investigate a causal relationship between prognosis and feature of ***: The mean age of the 51 patients with colorectal cancer(CRC) was older than that of those without CRC(30.5 vs 36.9, P = 0.002). Older individuals were more likely to have colon cancer at the time of FAP diagnosis [odds ratio, 4.75(95%CI: 1.71-13.89) and 5.91(1.76-22.12) for 40-49 years and age > 50 vs age < 30). The number of confirmed deaths was 13 and the median age at death was 40 years(range, 27 to 85 years). Ten of the deaths(76.9%) were from CRC. Another cause of two cases of death were desmoid tumors(15.4%). Development of cancer on remnant rectal or ileal mucosa after surgery was not observed. The APC mutation testing revealed 23 pathogenic mutations and one likely pathogenic mutation, among which were four novel mutations. The correlation between mutational status and clinical manifestations was investigated. Mutations that could prodict poor prognosis were at codon 1309 which located on mutation cluster region, codon 1465 and codon ***: Identification of APC mutations should aid in the diagnosis and counseling of family members in terms of early diagnosis and management of FAP.

关键词： Adenomatous polyposis coli Colorectal neoplasms APC gene Prognosis Survival

Voltage-induced material removal mechanism of copper for electrochemical-mechanical polishing applications

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中国有色金属学会会刊：英文版 2009年第B9期19卷 262-265页

作者： Sang-Jun HAN yong-jin SEO Nano-Information Material ＆ Device Laboratory Daebul University Chonnam 526-702 Korea School of Fusion Technology Daebul University Chonnam 526-702 Korea

The current-voltage (I-V) curves, such as linear sweep voltammetry (LSV) and cyclic voltammetry (CV), were employed to evaluate the effect of electrolyte concentration on the electrochemical reaction trend. From the I-V curve, the electrochemical states of active, passive, transient and trans-passive region could be characterized. And then, the mechanism of the process of voltage-induced material removal in electrochemical mechanical polishing (ECMP) of copper was investigated. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) analyses were used to observe the surface profile. Finally, the oxidation and reduction processes of the Cu surface were monitored by the repetition of anodic and cathodic potential from cyclic voltammetry (CV) method in acid-and alkali-based electrolyte.

关键词：电化学机械抛光材料去除机理铜电极电压诱导线性扫描伏安法扫描电子显微镜循环伏安法

Multi-View Multi-Modal Head-Gaze Estimation for Advanced Indoor User Interaction

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Computers, Materials & Continua 2022年第3期70卷 5107-5132页

作者： jung-Hwa Kim jin-Woo Jeong Department of Computer Engineering Kumoh National Institute of TechnologyGumi39177Korea Department of Data Science Seoul National University of Science and TechnologySeoul01811Kore

Gaze estimation is one of the most promising technologies for supporting indoor monitoring and interaction ***,previous gaze estimation techniques generally work only in a controlled laboratory environment because they require a number of high-resolution eye *** makes them unsuitable for welfare and healthcare facilities with the following challenging characteristics:1)users’continuous movements,2)various lighting conditions,and 3)a limited amount of available *** address these issues,we introduce a multi-view multi-modal head-gaze estimation system that translates the user’s head orientation into the gaze *** proposed system captures the user using multiple cameras with depth and infrared modalities to train more robust gaze estimators under the aforementioned *** this end,we implemented a deep learning pipeline that can handle different types and combinations of *** proposed system was evaluated using the data collected from 10 volunteer participants to analyze how the use of single/multiple cameras and modalities affect the performance of head-gaze *** various experiments,we found that 1)an infrared-modality provides more useful features than a depth-modality,2)multi-view multi-modal approaches provide better accuracy than singleview single-modal approaches,and 3)the proposed estimators achieve a high inference efficiency that can be used in real-time applications.

关键词： Human-computer interaction deep learning head-gaze estimation indoor monitoring

Microglia in neurodegenerative diseases

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Neural Regeneration Research 2021年第2期16卷 270-280页

作者： Yu Xu Ming-Zhu jin Ze-yong Yang Wei-Lin jin Department of Anesthesiology International Peace Maternity and Child Health HospitalShanghai Jiao Tong University School of MedicineShanghai Key Laboratory of Embryo Original DiseaseShanghai Municipal Key Clinical SpecialtyShanghaiChina Shanghai Jiao Tong University School of Medicine ShanghaiChina Institute of Nano Biomedicine and Engineering Department of Instrument Science and EngineeringKey Laboratory for Thin Film and Microfabrication Technology of Ministry of EducationSchool of Electronic Information and Electronic EngineeringShanghai Jiao Tong UniversityShanghaiChina National Centers for Translational Medicine Shanghai Jiao Tong UniversityShanghaiChina Shaanxi Key Laboratory of Brain Disorders&Institute of Basic and Translational Medicine Xi’an Medical UniversityXi’anShaanxi ProvinceChina

A major feature of neurodegeneration is disruption of central nervous system homeostasis,during which microglia play diverse *** the central nervous system,microglia serve as the first line of immune defense and function in synapse pruning,injury repair,homeostasis maintenance,and regulation of brain development through scavenging and *** pathological conditions or various stimulations,microglia proliferate,aggregate,and undergo a variety of changes in cell morphology,immunophenotype,and *** review presents the features of microglia,especially their diversity and ability to change dynamically,and reinterprets their role as sensors for multiple stimulations and as effectors for brain aging and *** review also summarizes some therapeutic approaches for neurodegenerative diseases that target microglia.

关键词： central nervous system microglia neurodegeneration neuroinflammation plasticity

Study of engine noise based on independent component analysis

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第5期8卷 772-777页

作者： HAO Zhi-yong jin Yan YANG Chen School of Mechanical and Energy Engineering Zhejiang University Hangzhou 310027 China

Independent component analysis was applied to analyze the acoustic signals from diesel engine. First the basic prin-ciple of independent component analysis (ICA) was reviewed. Diesel engine acoustic signal was decomposed into several inde-pendent components (ICs); Fourier transform and continuous wavelet transform (CWT) were applied to analyze the independent components. Different noise sources of the diesel engine were separated, based on the characteristics of different component in time-frequency domain.

关键词： Acoustic signals Independent component analysis (ICA) Wavelet transform Noise source identification

Semantic and Structural Analysis of TV Diving Programs

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Journal of Computer Science & Technology 2004年第6期19卷 928-935页

作者： FeiWang jin-TaoLi yong-DongZhang Shou-XunLin InstituteofComputingTechnology TheChineseAcademyofSciencesBeijing100080P.R.China

Automatic content analysis of sports videos is a valuable and challenging task. Motivated by analogies between a class of sports videos and languages, the authors propose a novel approach for sports video analysis based on compiler principles. It integrates both semantic analysis and syntactic analysis to automatically create an index and a table of contents for a sports video. Each shot of the video sequence is first annotated and indexed with semantic labels through detection of events using domain knowledge. A grammar-based parser is then constructed to identify the tree structure of the video content based on the labels. Meanwhile, the grammar can be used to detect and recover errors during the analysis. As a case study, a sports video parsing system is presented in the particular domain of diving. Experimental results indicate the proposed approach is effective. Keywords sports video - event detection - grammar - video retrieval - content analysis and index This work was supported in part by the State Physical Culture Administration of China under Grant No.02005.Fei Wang was born in 1977. He is a Ph.D. candidate at Institute of Computing Technology (ICT), the Chinese Academy of Sciences (CAS). He received the B.S. degree in electrical engineering from Zhejiang University in 1999 and the M.S degree in computer science from Graduate School of the Chinese Academy of Sciences in 2001. His current research interests include content-based video analysis and retrieval.jin-Tao Li was born in 1962. He is a professor and Ph.D. supervisor at ICT, CAS. His main research areas include multimedia data compression, virtual reality, and home network.yong-Dong Zhang was born in 1973. He is an associate professor at ICT, CAS. His main research areas include multimedia data compression and multimedia information retrieval.Shou-Xun Lin was born in 1948. He is a professor and Ph.D. supervisor at ICT, CAS. His main research areas include multimedia technology and system

关键词： sports video event detection grammar video retrieval content analysis and index

Comparison of different techniques for time-frequency analysis of internal combustion engine vibration signals

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第7期12卷 519-531页

作者： Yang jin Zhi-yong HAO Xu ZHENG Department of Energy Engineering Zhejiang University Hangzhou 310027 China Department of Automotive Engineering Hubei University of Automotive Technology Shiyan 442002 China

In this study,we report an analysis of cylinder head vibration signals at a steady engine speed using short-time Fourier transform(STFT).Three popular time-frequency analysis techniques,i.e.,STFT,analytic wavelet transform(AWT) and S transform(ST),have been *** and ST are often applied in engine signal *** particular,an AWT expression in terms of the quality factor Q and an analytical relationship between ST and AWT have been *** time-frequency resolution of a Gaussian function windowed STFT was studied via numerical *** on the simulation,the empirical limits for the lowest distinguishable frequency as well as the time and frequency resolutions were *** can provide insights for window width selection,spectrogram interpretation and artifact *** function windowed STFTs were applied to some cylinder head vibration *** spectrograms of the same signals from ST and AWT were also determined for *** results indicate that the uniform resolution feature of STFT is not necessarily a disadvantage for time-frequency analysis of vibration signals when the engine is in stationary state because it can more accurately localize the frequency components excited by transient excitations without much loss of time resolution.

关键词： Short-time Fourier transform(STFT) Gaussian window Time-frequency resolution limits Internal combustion(IC) engine Vibration signals Analytic wavelet transform(AWT) S transform(ST)

Development of a skill assessment tool for the Korea operational oceanographic system

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Acta Oceanologica Sinica 2013年第9期32卷 74-81页

作者： CHO Kyoung-Ho CHOI jin-yong JEONG Sang-Hun CHOI jung-Woon KWON Jae-Il PARK Kwang-Soon Coastal Disaster Research Center Korea Institute of Ocean Science and Technology

A standard skill assessment （SA） tool was developed and implemented to evaluate the performance of op- erational forecast models in the Korea operational oceanographic system. The SA tool provided a robust way to assess model skill in the system by comparing predictions and observations, and involved the com- putation of multiple skill metrics including correlation and error skills. User- and system-based acceptance criteria of skill metrics were applied to determine whether predictions were acceptable for the system. To achieve this, the tool produced a time series comparison plot, a skill score table, and an advanced sum- marized diagram to effectively demonstrate the multiple skill scores. Moreover, the SA was conducted to evaluate both atmospheric and hydrodynamic forecast variables. For the atmospheric variables, acceptable error criteria were preferable to acceptable correlation criteria over short timescales, since the mean square error overwhelmed the observation variance. Conversely, for the hydrodynamic variables, acceptable root mean square percentage error （e.g., perms） criteria were preferable to acceptable error （e.g., erms） criteria owing to the spatially variable tidal intensity around the Korean Peninsula. Furthermore, the SA indicated that predetermined acceptance error criteria were appropriate to satisfy a target central frequency （fc） for which errors fell within the specified limits （i.e., the .fc equals 70%）.

关键词： skill assessment tool operational forecast system Korea operational oceanographic system