Yong Ma

This page is a disambiguation page, it actually contains mutiple papers from persons of the same or a similar name.

Bibliography

2025
A novel image dehazing algorithm for complex natural environments.
Pattern Recognit., 2025

Artificial bee colony algorithm based on multi-neighbor guidance.
Expert Syst. Appl., 2025

2024
Deep semantic learning for acoustic scene classification.
EURASIP J. Audio Speech Music. Process., December, 2024

Dense video super-resolution time-differential network with feature enrichment module.
Signal Image Video Process., November, 2024

Online channel configuration strategy considering contract manufacturer encroachment and green investment.
Electron. Commer. Res., September, 2024

The optimal encroachment strategy of private-label considering the quality effort and platform's e-word-of-mouth.
Electron. Commer. Res., September, 2024

Production of Annual Nighttime Light Based on De-Difference Smoothing Algorithm.
Remote. Sens., August, 2024

RPPM: A Reputation-Based and Privacy-Preserving Platoon Management Scheme in Vehicular Networks.
IEEE Trans. Intell. Transp. Syst., June, 2024

YOLOv7oSAR: A Lightweight High-Precision Ship Detection Model for SAR Images Based on the YOLOv7 Algorithm.
Remote. Sens., March, 2024

Establishing Trustworthy and Privacy-Preserving SAGIVNs in 6G: Architectures, Requirements, and Solutions.
IEEE Netw., March, 2024

Lightweight ship target detection algorithm based on improved YOLOv5s.
J. Real Time Image Process., February, 2024

Lightweight and Privacy-Preserving Dual Incentives for Mobile Crowdsensing.
IEEE Trans. Cloud Comput., 2024

Multimodal Speech Emotion Recognition Based on Large Language Model.
IEICE Trans. Inf. Syst., 2024

A novel prompt-tuning method: Incorporating scenario-specific concepts into a verbalizer.
Expert Syst. Appl., 2024

TL-TSD: A two-layer traffic sub-area division framework based on trajectory clustering.
Eng. Appl. Artif. Intell., 2024

HESSO: Towards Automatic Efficient and User Friendly Any Neural Network Training and Pruning.
CoRR, 2024

CodePrompt: Improving Source Code-Related Classification with Knowledge Features through Prompt Learning.
CoRR, 2024

DPD-Net: Dual-path Proposal Discriminative Network for abnormal cell detection in cervical cytology images.
Biomed. Signal Process. Control., 2024

Adaptive multi-population artificial bee colony algorithm based on fitness landscape analysis.
Appl. Soft Comput., 2024

Human-centered AI Technologies in Human-robot Interaction for Social Settings.
Proceedings of the International Conference on Mobile and Ubiquitous Multimedia, 2024

Workflow Task Offloading Upon MEC: A Novel Mobility-Aware and Clustering-Based Approach.
Proceedings of the Web Services - ICWS 2024, 2024

A Novel Redundant Service Caching and Task Offloading Method in Mobile Edge Computing.
Proceedings of the Web Services - ICWS 2024, 2024

Screening for Alzheimer's Disease in Mainland China Based on Syntax Impairment.
Proceedings of the International Conference on Asian Language Processing, 2024

2023
Large Environment Indoor Localization Leveraging Semi-Tensor Product Compression Sensing.
IEEE Internet Things J., October, 2023

A Performance and Reliability-Guaranteed Predictive Approach to Service Migration Path Selection in Mobile Computing.
IEEE Internet Things J., October, 2023

Tabu search for proactive project scheduling problem with flexible resources.
Comput. Oper. Res., May, 2023

Temporal Co-Attention Guided Conditional Generative Adversarial Network for Optical Image Synthesis.
Remote. Sens., April, 2023

SA-GAN: A Second Order Attention Generator Adversarial Network with Region Aware Strategy for Real Satellite Images Super Resolution Reconstruction.
Remote. Sens., March, 2023

Strategies for the retail platform to counteract match uncertainty: Virtual showroom and return or exchange policy.
Comput. Ind. Eng., February, 2023

Passive Target Positioning on Uncertain Detection Path Based on Entangled Light Quantum.
IEEE Trans. Instrum. Meas., 2023

Automatic High-Accuracy Sea Ice Monitoring in the Arctic Using MODIS Data.
IEEE Trans. Geosci. Remote. Sens., 2023

Robust Deep Learning Seismic Velocity Inversion Over Varying Acquisitions.
IEEE Geosci. Remote. Sens. Lett., 2023

Strengthened multiple correlation for multi-label few-shot intent detection.
Neurocomputing, 2023

A decomposition-based two-stage online scheduling approach and its integrated system in the hybrid flow shop of steel industry.
Expert Syst. Appl., 2023

Automated Verification of an In-Production DNS Authoritative Engine.
Proceedings of the 29th Symposium on Operating Systems Principles, 2023

Reinforcement Learning based Tree Decomposition for Distance Querying in Road Networks.
Proceedings of the 39th IEEE International Conference on Data Engineering, 2023

Female Menstrual Emergency Service Experience Design for College Students.
Proceedings of the Design, User Experience, and Usability, 2023

A Multi-Agent Deep Reinforcement Learning-Based Approach to Mobility-Aware Caching.
Proceedings of the Collaborative Computing: Networking, Applications and Worksharing, 2023

DQN-Based Applications Offloading with Multiple Interdependent Tasks in Mobile Edge Computing.
Proceedings of the Collaborative Computing: Networking, Applications and Worksharing, 2023

Edge Server Deployment Approach Based on Uniformity and Centrality.
Proceedings of the Collaborative Computing: Networking, Applications and Worksharing, 2023

Silence is not Golden: Disrupting the Load Balancing of Authoritative DNS Servers.
Proceedings of the 2023 ACM SIGSAC Conference on Computer and Communications Security, 2023

Cervical Cytology Classification with Coarse Labels Based on Two-Stage Weakly Supervised Contrastive Learning Framework.
Proceedings of the IEEE International Conference on Bioinformatics and Biomedicine, 2023

2022
A novel fault-tolerant scheduling approach for collaborative workflows in an edge-IoT environment.
Digit. Commun. Networks, December, 2022

Novel Workload-Aware Approach to Mobile User Reallocation in Crowded Mobile Edge Computing Environment.
IEEE Trans. Intell. Transp. Syst., 2022

Optimal Dynamic Supply of Parking Permits Under Uncertainties: A Stochastic Control Approach.
IEEE Trans. Intell. Transp. Syst., 2022

Detection of Interturn Short-Circuit Faults in DFIGs Based on External Leakage Flux Sensing and the VMD-RCMDE Analytical Method.
IEEE Trans. Instrum. Meas., 2022

Low-Resource Language Discrimination toward Chinese Dialects with Transfer Learning and Data Augmentation.
ACM Trans. Asian Low Resour. Lang. Inf. Process., 2022

Estimation of Photovoltaic Energy in China Based on Global Land High-Resolution Cloud Climatology.
Remote. Sens., 2022

A dual-rail/single-rail hybrid system using null convention logic circuits.
Microelectron. J., 2022

Review of Research on Vision-Based Parking Space Detection Method.
Int. J. Web Serv. Res., 2022

A Control-Chart-Based Detector for Small-Amount Electricity Theft (SET) Attack in Smart Grids.
IEEE Internet Things J., 2022

DoSRA: A Decentralized Approach to Online Edge Task Scheduling and Resource Allocation.
IEEE Internet Things J., 2022

A wearable-based posture recognition system with AI-assisted approach for healthcare IoT.
Future Gener. Comput. Syst., 2022

Research on Intelligent Evaluation System of Sports Training based on Video Image Acquisition and Scene Semantics.
Adv. Multim., 2022

The New Model of Game Cross Efficiency DEA With Index Groups and an Application to Land Utilization Efficiency.
IEEE Access, 2022

A Comparative Study of the Educational Practice of Industrial Design Majors for New Engineering Disciplines.
Proceedings of the IEEE International Conference on Teaching, 2022

Zero-Shot Object Detection with Multi-label Context.
Proceedings of the 34th International Conference on Software Engineering and Knowledge Engineering, 2022

An Encrypted Abnormal Stream Detection Method Based on Improved Skyline Computation.
Proceedings of the International Conference on Networking and Network Applications, 2022

Edge Computing-Based Multitasking Strategies in Smart Grids.
Proceedings of the Mobile Networks and Management - 12th EAI International Conference, 2022

A Cloud-Side Task Scheduling Algorithm with Multiple Evaluation Metrics.
Proceedings of the Mobile Networks and Management - 12th EAI International Conference, 2022

FRSM: A Novel Fault-Tolerant Approach for Redundant-Path-Enabled Service Migration in Mobile Edge Computing.
Proceedings of the Web Services - ICWS 2022, 2022

A Novel Approach for User Demand-aware Data Center Construction and Service Consolidation.
Proceedings of the Web Services - ICWS 2022, 2022

A Mobility-Aware and Fault-Tolerant Service Offloading Method in Mobile Edge Computing.
Proceedings of the IEEE International Conference on Web Services, 2022

A fault-tolerant workflow scheduling method on deep reinforcement learning-based in edge environment.
Proceedings of the IEEE International Conference on Networking, Sensing and Control, 2022

Workload-Aware Shortest Path Distance Querying in Road Networks.
Proceedings of the 38th IEEE International Conference on Data Engineering, 2022

Huffman Tree Based Multi-resolution Temporal Convolution Network for Electricity Time Series Prediction.
Proceedings of the Green, Pervasive, and Cloud Computing - 17th International Conference, 2022

2021
Research Review on Parking Space Detection Method.
Symmetry, 2021

Automatic, Illumination-Invariant and Real-Time Green-Screen Keying Using Deeply Guided Linear Models.
Symmetry, 2021

Global Land High-Resolution Cloud Climatology Based on an Improved MOD09 Cloud Mask.
Remote. Sens., 2021

Automatic High-Accuracy Sea Ice Mapping in the Arctic Using MODIS Data.
Remote. Sens., 2021

Human posture tracking with flexible sensors for motion recognition.
Comput. Animat. Virtual Worlds, 2021

Online user allocation in mobile edge computing environments: A decentralized reactive approach.
J. Syst. Archit., 2021

Composite Heuristics for Scheduling Tasks in Mobile Edge Computing by Considering Security.
J. Circuits Syst. Comput., 2021

Electronic phenotyping of health outcomes of interest using a linked claims-electronic health record database: Findings from a machine learning pilot project.
J. Am. Medical Informatics Assoc., 2021

Research Review on the Application of Homomorphic Encryption in Database Privacy Protection.
Int. J. Cogn. Informatics Nat. Intell., 2021

Residential Electricity Classification Method Based On Cloud Computing Platform and Random Forest.
Comput. Syst. Sci. Eng., 2021

Direct selling, agent selling, or dual-format selling: Electronic channel configuration considering channel competition and platform service.
Comput. Ind. Eng., 2021

Improving Unmanned Aerial Vehicle (UAV) remote sensing of rice plant potassium accumulation by fusing spectral and textural information.
Int. J. Appl. Earth Obs. Geoinformation, 2021

SecSky: A Secure Dynamic Skyline Query Scheme With Data Privacy.
IEEE Access, 2021

Our Learned Lessons from Cross-Lingual Speaker Verification: The CRMI-DKU System Description for the Short-Duration Speaker Verification Challenge 2021.
Proceedings of the 22nd Annual Conference of the International Speech Communication Association, Interspeech 2021, Brno, Czechia, August 30, 2021

2020
A Comparative Assessment of Measures of Leaf Nitrogen in Rice Using Two Leaf-Clip Meters.
Sensors, 2020

Multipath TCP-Based IoT Communication Evaluation: From the Perspective of Multipath Management with Machine Learning.
Sensors, 2020

Research on the Influence of Vehicle Speed on Safety Warning Algorithm: A Lane Change Warning System Case Study.
Sensors, 2020

A Novel Coevolutionary Approach to Reliability Guaranteed Multi-Workflow Scheduling upon Edge Computing Infrastructures.
Secur. Commun. Networks, 2020

Analysis of Ice Storm Impact on and Post-Disaster Recovery of Typical Subtropical Forests in Southeast China.
Remote. Sens., 2020

Trends in the Stability of Antarctic Coastal Polynyas and the Role of Topographic Forcing Factors.
Remote. Sens., 2020

Effect of manufacturing technics on the microstructure and temperature-affected electrical performance of D-type latch devices.
Microelectron. J., 2020

DRGAN: a deep residual generative adversarial network for PET image reconstruction.
IET Image Process., 2020

Prototype Relaxation With Robust Principal Component Analysis for Zero Shot Learning.
IEEE Access, 2020

Safeguarding Multi-UAVs Relaying Communications via Joint Trajectory Design and Power Control.
Proceedings of the 2020 International Conference on Wireless Communications and Signal Processing (WCSP), 2020

A Stochastic-Performance-Distribution-Based Approach to Cloud Workflow Scheduling with Fluctuating Performance.
Proceedings of the Web Services - ICWS 2020, 2020

Scheduling Multi-workflows over Edge Computing Resources with Time-Varying Performance, A Novel Probability-Mass Function and DQN-Based Approach.
Proceedings of the Web Services - ICWS 2020, 2020

A Decentralized Collaborative Approach to Online Edge User Allocation in Edge Computing Environments.
Proceedings of the 2020 IEEE International Conference on Web Services, 2020

Zero-Shot Restoration of Underexposed Images via Robust Retinex Decomposition.
Proceedings of the IEEE International Conference on Multimedia and Expo, 2020

Oecs: Towards Online Extrinsics Correction For The Surround-View System.
Proceedings of the IEEE International Conference on Multimedia and Expo, 2020

A Study Of Parking-Slot Detection With The Aid Of Pixel-Level Domain Adaptation.
Proceedings of the IEEE International Conference on Multimedia and Expo, 2020

Correlation Analysis of Internet Addiction with Daily Behavior: A Data-Driven Method.
Proceedings of the ICBDT 2020: 3rd International Conference on Big Data Technologies, 2020

A Network Traffic Classification Method Based on Hierarchical Clustering.
Proceedings of the Frontiers in Cyber Security - Third International Conference, 2020

Location-Aware Edge Service Migration for Mobile User Reallocation in Crowded Scenes.
Proceedings of the Collaborative Computing: Networking, Applications and Worksharing, 2020

A Novel Probabilistic-Performance-Aware Approach to Multi-workflow Scheduling in the Edge Computing Environment.
Proceedings of the Collaborative Computing: Networking, Applications and Worksharing, 2020

A Novel Probabilistic-Performance-Aware and Evolutionary Game-Theoretic Approach to Task Offloading in the Hybrid Cloud-Edge Environment.
Proceedings of the Collaborative Computing: Networking, Applications and Worksharing, 2020

Sensock: 3D Foot Reconstruction with Flexible Sensors.
Proceedings of the CHI '20: CHI Conference on Human Factors in Computing Systems, 2020

Deep Semantic Encoder-Decoder Network for Acoustic Scene Classification with Multiple Devices.
Proceedings of the Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, 2020

2019
An Approach to Segment and Track-Based Pedestrian Detection from Four-Layer Laser Scanner Data.
Sensors, 2019

Can Investors on P2P Lending Platforms Identify Default Risk?
Int. J. Electron. Commer., 2019

Law, discipline and governance based on cognitive process simulation - analysis of legal forms in the modern rights relationship.
Cogn. Syst. Res., 2019

An Intelligent Artificial Neural Network Modeling of a Magnetorheological Elastomer Isolator.
Algorithms, 2019

Verifiable Subgraph Matching With Cryptographic Accumulators in Cloud Computing.
IEEE Access, 2019

Integrated Application of Blockchain in the Electric Information Management System.
Proceedings of the 7th International Conference on Information Technology and Quantitative Management, 2019

Code-Switching Sentence Generation by Bert and Generative Adversarial Networks.
Proceedings of the 20th Annual Conference of the International Speech Communication Association, 2019

Effective L-Diversity Anonymization Algorithm Based on Improved Clustering.
Proceedings of the Cyberspace Safety and Security - 11th International Symposium, 2019

A Novel Artificial Bee Colony Algorithm with Division of Labor for Solving CEC 2019 100-Digit Challenge Benchmark Problems.
Proceedings of the IEEE Congress on Evolutionary Computation, 2019

Identification of Alzheimer's Disease Patients Based on Oral Speech Features.
Proceedings of the 2019 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, 2019

Focal Loss for End-to-end Short Utterances Chinese Dialect Identification.
Proceedings of the 2019 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, 2019

A Study on Low-resource Language Identification.
Proceedings of the 2019 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, 2019

2018
Monitoring Quarry Area with Landsat Long Time-Series for Socioeconomic Study.
Remote. Sens., 2018

An Elite Group Guided Artificial Bee Colony Algorithm with a Modified Neighborhood Search.
Proceedings of the PRICAI 2018: Trends in Artificial Intelligence, 2018

Accelerating Artificial Bee Colony Algorithm with Elite Neighborhood Learning.
Proceedings of the Algorithms and Architectures for Parallel Processing, 2018

K-Anonymity Algorithm Based on Improved Clustering.
Proceedings of the Algorithms and Architectures for Parallel Processing, 2018

Short-Text Sentiment Analysis Based on Windowed Word Vector.
Proceedings of the Communications, Signal Processing, and Systems, 2018

2017
Chinese Dialects Identification Using Attention-Based Deep Neural Networks.
Proceedings of the Communications, Signal Processing, and Systems, 2017

2016
Crowdsourcing Rapid Assessment of Collapsed Buildings Early after the Earthquake Based on Aerial Remote Sensing Image: A Case Study of Yushu Earthquake.
Remote. Sens., 2016

An Automatic Procedure for Early Disaster Change Mapping Based on Optical Remote Sensing.
Remote. Sens., 2016

Structural credit risk modelling with Hawkes jump diffusion processes.
J. Comput. Appl. Math., 2016

The Approach to Detect Abnormal Access Behavior Based on Naive Bayes Algorithm.
Proceedings of the 10th International Conference on Innovative Mobile and Internet Services in Ubiquitous Computing, 2016

The Scheme of Detecting Encoded Malicious Web Pages Based on Information Entropy.
Proceedings of the 10th International Conference on Innovative Mobile and Internet Services in Ubiquitous Computing, 2016

2015
Comprehensive Improved Simulated Annealing Optimization for Floorplanning of Heterogeneous 3D Networks-on-Chip.
J. Interconnect. Networks, 2015

2013
Parameter Identification for Iron and Steel Enterprise Steam Network Model.
J. Networks, 2013

Minimum Error Tree Decomposition
CoRR, 2013

Study on the Value Promotion and Development Strategy of Smart Tourism.
Proceedings of the 12th Wuhan International Conference on E-Business, 2013

2012
Research on heart sound identification technology.
Sci. China Inf. Sci., 2012

Management Innovation Capabilities Evaluation of Small and Medium-sized High-tech Enterprises in Shanghai.
Proceedings of the Fifth International Conference on Business Intelligence and Financial Engineering, 2012

2011
Terahertz spectroscopic uncertainty analysis for explosive mixture components determination using multi-objective micro-genetic algorithm.
Adv. Eng. Softw., 2011

Speaker segmentation and clustering based on the improved spectral clustering.
Proceedings of the 2011 IEEE International Workshop on Machine Learning for Signal Processing, 2011

Face alignment via joint-AAM.
Proceedings of the 1st International Conference on Multimedia Retrieval, 2011

Person-specific age estimation under ranking framework.
Proceedings of the 1st International Conference on Multimedia Retrieval, 2011

Local primitive code mining for fast and accurate face recognition.
Proceedings of the 18th IEEE International Conference on Image Processing, 2011

2010
Algorithmic Exploration and Implementation of a MIMO-OFDM Equalizer.
J. Signal Process. Syst., 2010

An Adaptive Fast Algorithm for Coding Block Mode Selection.
Proceedings of the Third International Symposium on Intelligent Information Technology and Security Informatics, 2010

A New Structured Peer-to-Peer Architecture Based on Physical Distance.
Proceedings of the 16th IEEE International Conference on Parallel and Distributed Systems, 2010

Local binary pattern probability model based facial feature localization.
Proceedings of the International Conference on Image Processing, 2010

Design of Wireless Sensor Networks in prevention of combustion on coal gangue based on pseudo-parallel genetic algorithms.
Proceedings of the Third International Workshop on Advanced Computational Intelligence, 2010

2009
Model and Evaluation of Redundant Data Organization for High Availability in Structured Overlay Networks.
Proceedings of the 10th ACIS International Conference on Software Engineering, 2009

P2P-Based Single Sign-On.
Proceedings of the Eighth IEEE International Conference on Dependable, 2009

Scalable Image Retrieval Based on Feature Forest.
Proceedings of the Computer Vision, 2009

2008
Static Web Protection Algorithm based on Chord Ring.
Proceedings of the Fourth International Conference on Semantics, Knowledge and Grid, 2008

The Coarse-grained Computing P2P Algorithm Based on Load Balance Tree.
Proceedings of the International Conference on Parallel and Distributed Processing Techniques and Applications, 2008

Adaptive video watermarking algorithm based on MPEG-4 streams.
Proceedings of the 10th International Conference on Control, 2008

Re-weighting Linear Discrimination Analysis under ranking loss.
Proceedings of the 2008 IEEE Computer Society Conference on Computer Vision and Pattern Recognition (CVPR 2008), 2008

2007
Evaluation of Hydrodynamic Performance of the Sailboard.
Proceedings of the 2007 International Conference on Intelligent Pervasive Computing, 2007

Evaluation of the Performance of the Double Rowing Hull.
Proceedings of the 2007 International Conference on Intelligent Pervasive Computing, 2007

Development of Intelligent Testing and Assessment System of Power Ability.
Proceedings of the 2007 International Conference on Intelligent Pervasive Computing, 2007

Study on the Division Tactics of Top Swimming Athletes Home and Abroad in the 400m Freestyle Swimming Race.
Proceedings of the 3rd International Conference on Intelligent Information Hiding and Multimedia Signal Processing (IIH-MSP 2007), 2007

Discriminant analysis in correlation similarity measure space.
Proceedings of the Machine Learning, 2007

Person-Specific SIFT Features for Face Recognition.
Proceedings of the IEEE International Conference on Acoustics, 2007

Model reduction of nonreversible Markov chains.
Proceedings of the 46th IEEE Conference on Decision and Control, 2007

An Adaptive Nonparametric Discriminant Analysis Method and Its Application to Face Recognition.
Proceedings of the Computer Vision, 2007

2006
Sparse Bayesian Regression for Head Pose Estimation.
Proceedings of the 18th International Conference on Pattern Recognition (ICPR 2006), 2006

The Coarse-Grained Computing P2P Algorithm Based on SPKI.
Proceedings of the Advances in Natural Computation, Second International Conference, 2006

A fast and robust 3D head pose and gaze estimation system.
Proceedings of the 8th International Conference on Multimodal Interfaces, 2006

2005
Deep into the Framework for Different Coarse-grained P2P Computing Based on JXTA.
Proceedings of the 2005 International Conference on Semantics, 2005

A middleware-based agent of online integrate and instant collaboration for transparent CAD applications.
Proceedings of the Ninth International Conference on Computer Supported Cooperative Work in Design, 2005

Using a Middleware Agent to Bridge Standalone CAD Systems for Distributed and Collaborative Applications.
Proceedings of the Computer Supported Cooperative Work in Design II, 2005

2004
System Lifetime Optimization for Heterogeneous Sensor Networks with a Hub-Spoke Topology.
IEEE Trans. Mob. Comput., 2004


Robust Precise Eye Location Under Probabilistic Framework.
Proceedings of the Sixth IEEE International Conference on Automatic Face and Gesture Recognition (FGR 2004), 2004

2003
Robust real-time face detection based on cost-sensitive AdaBoost method.
Proceedings of the 2003 IEEE International Conference on Multimedia and Expo, 2003

Real-time rotation invariant face detection based on cost-sensitive AdaBoost.
Proceedings of the 2003 International Conference on Image Processing, 2003

2002
Face Detection Based on Cost-Sensitive Support Vector Machines.
Proceedings of the Pattern Recognition with Support Vector Machines, 2002

Face Detection Based on Hierarchical Support Vector Machines.
Proceedings of the 16th International Conference on Pattern Recognition, 2002

1994
The Refinement of Probabilistic Rule Sets: Sociopathic Interactions.
Artif. Intell., 1994

1991
Improving the Performance of Inconsistent Knowledge Bases via Combined Optimization Method.
Proceedings of the Eighth International Workshop (ML91), 1991

Induction of Uncertain Rules and the Sociopathicity Property in Dempster-Shafer Theory.
Proceedings of the Symbolic and Quantitative Approaches to Reasoning and Uncertainty, 1991


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