yusuke1997/dblp-id-title huggingface dataset:
From LLMs to Randomness: Analyzing Program Input Efficacy With Resource and Language Metrics
HEAP: An Efficient and Fault-Tolerant Authentication and Key Exchange Protocol for Hadoop-Assisted Big Data Platform
Budgeted Profit Maximization Under the Multiple Products Independent Cascade Model
Collaborative Decision-Making Method for Multi-UAV Based on Multiagent Reinforcement Learning
Optimized Design and Control for Hybrid MMC With Reduced Capacitance Requirements
Skeleton-Based ST-GCN for Human Action Recognition With Extended Skeleton Graph and Partitioning Strategy
Leveraging on the Impact of Imperfect Channel Estimation for MIMO Relaying Systems
Learning Multi-Scale Features and Batch-Normalized Global Features for Person Re-Identification
A Novel HF Broadband Frequency-Reconfigurable Whip Antenna With Radiation Blades Loading
Ensemble of Instance Segmentation Models for Polyp Segmentation in Colonoscopy Images
Multiple Drone-Cell Deployment Analyses and Optimization in Drone Assisted Radio Access Networks
Sampled-Data Resilient Control for Hybrid Nonlinear Stochastic Systems Under Periodic DoS Attacks
Antenna for Ultra-Wideband Applications With Non-Uniform Defected Ground Plane and Offset Aperture-Coupled Cylindrical Dielectric Resonators
Industrial Robot Kinematic Calibration: Generation of Optimal Calibration Configuration Set Based on Cartesian Space Constraints
A Novel Marine Oil Spillage Identification Scheme Based on Convolution Neural Network Feature Extraction From Fully Polarimetric SAR Imagery
Color Consistency Anime Style Transfer Based on Hybrid Structural Decomposition Network
Optimization of the Virtual Scene Layout Based on the Optimal 3D Viewpoint
An Efficient Two-Server Ranked Dynamic Searchable Encryption Scheme
Fault-Tolerant Control of a Quadrotor Unmanned Aerial Vehicle With Single Rotor Failure in Dense Obstacle Environments
Mobility-Aware Fog Computing in Dynamic Environments: Understandings and Implementation
Designing Adaptive Extended Reality Training Systems Based on Expert Instructor Behaviors
Low Energy Interleaved Chaotic Secure Image Coding Scheme for Visual Sensor Networks Using Pascal's Triangle Transform
Reliability Varying Characteristics of PV-ESS-Based Standalone Microgrid
Games for Teaching Mathematics in Nigeria: What Happens to Pupils' Engagement and Traditional Classroom Dynamics?
Multilevel Programming-Based Coordinated Cyber Physical Attacks and Countermeasures in Smart Grid
Machine Learning for Plasma Disruption Prediction in TCABR
On-Line Obstacle Detection, Avoidance, and Mapping of an Outdoor Quadrotor Using EKF-Based Fuzzy Tracking Incremental Control
Topology Optimization of the IPMSM for HEVs Using a Normalized Gaussian Network With Divided Region Method for Weighting Coefficients
Progressive Guided Fusion Network With Multi-Modal and Multi-Scale Attention for RGB-D Salient Object Detection
High-Frequency-Based Transmission Line Percentage Differential Protection With Traveling Wave Alignment
Multiservice-Oriented Framework for Enhanced Data Collection and Visualization in Smart City Applications
Analysis of Hybrid PAPR Reduction Methods of OFDM Signal for HPA Models in Wireless Communications
Quantifying and Mitigating Cascading Impacts in HVdc-Interconnected Power Grids
Physical Layer Spoofing Attack Detection in MmWave Massive MIMO 5G Networks
Modeling and Optimization of Two-Sided Disassembly Line Balancing Problem Considering Interactions Among Precedence Free Tasks
Improved Transcription and Speaker Identification System for Concurrent Speech in Bahasa Indonesia Using Recurrent Neural Network
Handmade Trileaflet Valve Design and Validation for Pulmonary Valved Conduit Reconstruction Using Taguchi Method and Cascade Correlation Machine Learning Model
Analysis of Limiting Output Capacity of Low-Speed and High-Torque Surface-Mounted Permanent Magnet Motor Considering Resistance Voltage Drop
Enhancing the Detection of Misogynistic Content in Social Media by Transferring Knowledge From Song Phrases
DEDU: Dual-Enhancing Dense-UNet for Lowlight Image Enhancement and Denoise
Fault Interruption Scheme for HVDC System Using SiC-MESFET and VCB Based Hybrid Circuit Breaker
City Hotspot Identification Using Smart Cyber-Physical Social System
UniHENN: Designing Faster and More Versatile Homomorphic Encryption-Based CNNs Without im2col
Target Recognition of Multi Source Machine Vision Pan Tilt Integrated Inspection Robot for Power Inspection
Single Switch Module Type DC-DC Converter With Reduction in Voltage Stress
Reliability Estimation of Reciprocating Seals Based on Multivariate Dependence Analysis and Its Experimental Validation
Assessing Notification Timing Strategies for Improved Micro-Learning Engagement
Optimized Algorithm for RFID-Based Activity Recognition of the Elderly
ERT Based Computation of Solid Phase Fraction in Solid-Liquid Flow With Various Object Sizes
Implementing Relevance Feedback for Content-Based Medical Image Retrieval
Spectrum Sharing Between Radar and Communication Systems Based on Overlapped Virtual Subarrays
YOLO-FES: An Improved Elephant Intrusion Detector Based on YOLOv8n
Reduced Complexity Detection Schemes for Golden Code Systems
A Compact High-Performance Orthomode Transducer for the Atacama Large Millimeter Array (ALMA) Band 1 (31-45 GHz)
Leap2Trend: A Temporal Word Embedding Approach for Instant Detection of Emerging Scientific Trends
Establishment of the Model for Estimating the Organic Carbon Content of Forest Topsoil Based on Remote Sensing Data
A Systematic Review of Access Control Models: Background, Existing Research, and Challenges
Contextual Homogeneity-Based Patch Decomposition Method for Higher Point Cloud Compression
Road Traffic Anomaly Detection Based on Fuzzy Theory
Field Evaluation of Path-Planning Algorithms for Autonomous Mobile Robot in Smart Farms
Orbital Angular Momentum (OAM) Generation by Cylinder Dielectric Resonator Antenna for Future Wireless Communications
Radar Signal Recognition Based on CSRDNN Network
Risk Aversion Operator for Addressing Maximization Bias in Q-Learning
A Novel Convex Combination-Based Mixed Centrality Measure for Identification of Influential Nodes in Complex Networks
A Multi-View Co-Training Clustering Algorithm Based on Global and Local Structure Preserving
Exploring Deep Spectrum Representations via Attention-Based Recurrent and Convolutional Neural Networks for Speech Emotion Recognition
Improving Adaptability in Optimization-Based Decision Support Systems Through Large Language Models
Large-Scale Fading Characteristics and Models for Vehicle-to-Pedestrian Channel at 5-GHz
Volumetric Barrier Cutting Plane Algorithms for Stochastic Linear Semi-Infinite Optimization
A Virtual Reality Approach to the Assessment of Damage Effectiveness of Naval Artillery Ammunition Against Unmanned Surface Vessels
Server Placement and Task Allocation for Load Balancing in Edge-Computing Networks
Comprehensive Data-Driven Framework for Detecting and Classifying Non-Technical Distribution Losses
A Novel Multi-Image Encryption Scheme Using Generalized Rectangular Transform and Advanced 5-D Hyperchaotic Map
Deep Learning Models Based on Distributed Feature Representations for Alternative Splicing Prediction
Super-Energy-Resolution Material Decomposition for Spectral Photon-Counting CT Using Pixel-Wise Learning
Real-Time Vehicular Wireless System-Level Simulation
Similarity Calculation of 3D Model By Integrating Improved ACO Into HNN
Quality Assessment of Selective Laser Melting Components Using Quantitative Ultrasound Measurements and Image Texture Analysis
Real-Time Scheduling for Optimal Energy Optimization in Smart Grid Integrated With Renewable Energy Sources
On Total Transmission Power Minimization Approach to Decentralized Beamforming in Single-Carrier Asynchronous Bidirectional Relay-Assisted Communication Networks
Levelized Cost of Energy-Oriented Modular String Inverter Design Optimization for PV Generation System Using Geometric Programming
1DCNN-Residual Bidirectional LSTM for Permanent Magnet Synchronous Motor Temperature Prediction Based on Operating Condition Clustering
Experimental Setup for Online Fault Diagnosis of Induction Machines via Promising IoT and Machine Learning: Towards Industry 4.0 Empowerment
A Directed Acyclic Graph Network Combined With CNN and LSTM for Remaining Useful Life Prediction
Quantum Inspired Genetic Algorithm for Double Digest Problem
Cyber Threat Intelligence for Hybrid Attacks: Leveraging LLMs and Data Spaces
Analysis and Control of Switching Circulating Currents in Multi-Module Parallel SPWM Converters
Immersive Virtual Reality for Foreign Language Education: A PRISMA Systematic Review
Analysis of the Limitations of Further Improvement of the Efficiency of VVC-CABAC
Efficient Authentication of Multi-Dimensional Top-k Queries
Green Multistage Upgrade of Switches and Controllers for Bundled-Links SDNs
Energy Management in Microgrids Using Model-Free Deep Reinforcement Learning Approach
Automated Stroke Prediction Using Machine Learning: An Explainable and Exploratory Study With a Web Application for Early Intervention
Two-Stage Optimal Economic Scheduling for Commercial Building Multi-Energy System Through Internet of Things
An Improved Product Recommendation Method for Collaborative Filtering
Identifying Experts in Community Question Answering Website Based on Graph Convolutional Neural Network
Mission-Compliant Optimal Sensor Formation Positioning for Range-Based Underwater Localization
A Wideband and High-Gain All-Metallic Perpendicular-Corporate-Fed Multi-Layered Parallel-Plate Slot Array Antenna
Hybrid Control Scheme for Grasping a Non-Cooperative Tumbling Satellite
LU-NET: An Improved U-Net for Ventricular Segmentation
Doppler Shift and SFO Robust Synchronization for LoRa-Like Acoustic Underwater Communication
Physics-Based AI-Driven Surrogate Modeling for Structural Displacement Prediction in Mechanical Systems With Limited Sensor Data
Investigation on Formation Mechanisms of Methanol During Cellulose Insulation Aging Based on Molecular Dynamics Simulation
A Smart Automated Signature Extraction Scheme for Mobile Phone Number in Human-Centered Smart Home Systems
Solution of Nonlinear Reaction-Diffusion Model in Porous Catalysts Arising in Micro-Vessel and Soft Tissue Using a Metaheuristic
Formation Control of High-Order Swarm Systems With Time-Varying Delays and Switching Interconnections
On the Energy Efficiency of Interference Alignment in the $K$ -User Interference Channel
Multiple Attributes Decision Fusion for Wireless Sensor Networks Based on Intuitionistic Fuzzy Set
Software Standards and Software Failures: A Review With the Perspective of Varying Situational Contexts
Hardware Evaluation of Cluster-Based Agricultural IoT Network
Trustworthiness Evaluation of Large Language Models Using Multi-Criteria Decision Making
Online Decentralized Multi-Agents Meta-Learning With Byzantine Resiliency
A Family of Binary Memristor-Based Low-Pass Filters With Controllable Cut-Off Frequency
Autonomous Self-Reconfigurable Floor Cleaning Robot
An Intelligent Load Management System With Renewable Energy Integration for Smart Homes
Real-Time SOSM Super-Twisting Combined With Block Control for Regulating Induction Motor Velocity
Evaluation of Generative AI Models in Python Code Generation: A Comparative Study
A New 5-D Multistable Hyperchaotic System With Three Positive Lyapunov Exponents: Bifurcation Analysis, Circuit Design, FPGA Realization and Image Encryption
Constructing Large Transmission Matrix of Scattering Sample Based on Super-Resolution Algorithm
Joint Price Control and Service Distribution Scheme for User-Centric Cell-Free Network Systems
Enabling the Electric Future of Mobility: Robotic Automation for Electric Vehicle Battery Assembly
An Efficient Access Control Scheme With Outsourcing and Attribute Revocation for Fog-Enabled E-Health
Anodal Electrical Stimulation Enhances the Perceived Piquancy Induced by Chili Peppers and Wasabi
Recent Advancements in Quasi-Isotropic Antennas: A Review
Hybrid of Harmony Search Algorithm and Ring Theory-Based Evolutionary Algorithm for Feature Selection
Low-Cost CNN for Automatic Violence Recognition on Embedded System
FogChain: A Fog Computing Architecture Integrating Blockchain and Internet of Things for Personal Health Records
Scalable Contact-Capacitive MEMS Switches With High Capacitance Ratio for Millimeter-Wave Applications
Influence of PWM Torque Control Frequency in DC Motors by Means of an Optimum Design Method
Hyperspectral Anomaly Detection With Morphological Random Walker
VVC/H.266 Intra Mode QTMT Based CU Partition Using CNN
Supply Chain Management, Game-Changing Technologies, and Physical Internet: A Systematic Meta-Review of Literature
A Predictive Data Feature Exploration-Based Air Quality Prediction Approach
IEEE Access Special Section Editorial: Human-Centered Smart Systems and Technologies
Radiation Enhancement of an Ultrawideband Unidirectional Folded Bowtie Antenna for GPR Applications
A Real-Time Indoor Scene Analysis Method Based on RGBD Stream
PoBiTag: Toward Unobtrusive and Customizable Tag-Based Interaction With Optical Polarization and Birefringence
Reinforcement Learning-Based Control of Signalized Intersections Having Platoons
Predicting Chinese Phrase-Level Sentiment Intensity in Valence-Arousal Dimensions With Linguistic Dependency Features
Information Diffusion Predictive Model Using Radiation Transfer
Evolving Ensemble Models for Image Segmentation Using Enhanced Particle Swarm Optimization
Carbon Heating Tube Used for Rapid Heating System
Developing a Transparent Anaemia Prediction Model Empowered With Explainable Artificial Intelligence
Battery Internal-Heating Method via SW Mode Switching of the Drive Inverter During Electric Vehicle Stoppage
Energy-Efficient D2D Communication Based Retransmission Scheme for Reliable Multicast in Wireless Cellular Network
Distribution Games: A New Class of Games With Application to User Provided Networks
A New Degradation Model for Imaging in Natural Water and Validation Through Image Recovery
Transmission and Distribution Smart Grid System Based on Self-Hailing Controllable Crowbar
An Overview of Integrating Deep Learning Methods With Close-Range Hyperspectral Imaging for Agriculture
Unmanned Aerial System Trajectory Tracking Based on Diversified Grey Wolf Optimization Algorithm
Automatic Modulation Classification Using Compressive Convolutional Neural Network
Human Sensing by Using Radio Frequency Signals: A Survey on Occupancy and Activity Detection
Effect of Magnetic Field on Different Opening Processes of Multi-Break Vacuum Gaps
Design and Control for Piezoelectric Energy Harvester Based on a Heuristic Optimization Algorithms
Wave Excitation Force Estimation Using an Electrical-Based Extended Kalman Filter for Point Absorber Wave Energy Converters
Evolution Toward Data-Driven Spectrum Sharing: Opportunities and Challenges
Differential Evolution Algorithm Based on Coupling-Coordination-Based Mutation Strategy
Noisy-LSTM: Improving Temporal Awareness for Video Semantic Segmentation
Reset Control for DC-DC Converters: An Experimental Application
Multi-Path Relationship Preserved Social Network Embedding
Neurosurgical Craniotomy Localization Using Interactive 3D Lesion Mapping for Image-Guided Neurosurgery
Generative Private Synthetic Student Data for Learning Analytics: An Empirical Study
Simplified Approach for the Grounding Grid Design of Oil Onshore Site
Artificial Intelligence and Structural Health Monitoring of Bridges: A Review of the State-of-the-Art
Enhancing Honey Adulteration Detection With Optimal Subspace Wavelength Reduction in Vis-NIR Reflection Spectroscopy
SgWalk: Location Recommendation by User Subgraph-Based Graph Embedding
Spatial Distribution of Poverty Clusters and Its Prediction Algorithms: A Visual Analytics Approach to Understanding the Disparities of Poverty Across Zones
A Novel Capacity Estimation Method for the Lithium Batteries Using the Enhanced Coulomb Counting Method With Kalman Filtering
Intelligent Adaptive Jerk Control With Dynamic Compensation Gain for Permanent Magnet Linear Synchronous Motor Servo System
An Exploratory Study on Artifacts for Cyber Attack Attribution Considering False Flag: Using Delphi and AHP Methods
Two-Layer Nonlinear FIR Filter and Unscented Kalman Filter Fusion With Application to Mobile Robot Localization
Digital Twin for Railway: A Comprehensive Survey
Cycle Maximum Queue Length Estimation: An Integrated Deep Learning and Adaptive Neuro-Fuzzy Inference System Framework
A Novel Random Forest-SMOTE Framework With Polynomial Feature Engineering for Early Detection of Gastrointestinal Disorders
Logical Scenarios Parameterization for Automated Vehicle Safety Assessment: Comparison of Deceleration and Cut-In Scenarios From Japanese and German Highways
Asymmetric Physical Layer Encryption for Wireless Communications
Multi-Scale Semantic Fusion of a Large Receptive Field for Irregular Pelvic X-Ray Landmark Detection
An Efficient ISAR Imaging Method for Space Maneuvering Target Based on Multisynchrosqueezing Transform
Tumor Depth and Size Perception Using a Pneumatic Tactile Display in Laparoscopic Surgery
Adaptive Elastic GAN for High-Fidelity Blood Cell Image Hallucination and Classification
Compact, Popularity-Aware and Adaptive Hybrid Data Placement Schemes for Heterogeneous Cloud Storage
An Agent-Based Dynamic Framework for Population Evacuation Management
The Ultimate Evaluation of Current Consumption and QoS Metrics in 5G Mobile Networks Over IP Multimedia Subsystem (IMS)
ISO-Compatible Personal Temperature Measurement Using Visual and Thermal Images With Facial Region of Interest Detection
Analysis of the GNSS Code-Carrier Hardware Delay Difference in RTK Process: Effect, Measurement and Calibration
Hybrid Naïve Bayes Models for Scam Detection: Comparative Insights From Email and Financial Fraud
An Efficient Fuzzy-Logic Based Variable-Step Incremental Conductance MPPT Method for Grid-Connected PV Systems
AR P ILC: An Approach for Short-Term Prediction of Freeway Entrance Flow
Advanced Human Pose Estimation and Event Classification Using Context-Aware Features and XGBoost Classifier
Development of a 3D Printed Structural Electronics Force Sensor
Latent Feature Decentralization Loss for One-Class Anomaly Detection
Learning From Oracle Demonstrations - A New Approach to Develop Autonomous Intersection Management Control Algorithms Based on Multiagent Deep Reinforcement Learning
A Two-Stage Approach of Joint Route Planning and Resource Allocation for Multiple UAVs in Unmanned Logistics Distribution
Speed Control for SRM Drive System Based on Switching Variable Proportional Desaturation PI Regulator
Multi-Modal Registration Using a Block-Wise Coarse-to-Fine Approach
Hephaistos: A Data Flow Analysis Framework for Identifying Browser Fingerprinting Functions in JavaScript
Proactive Cable Replacement Planning Using Neural Weibull Proportional Hazard Modeling and Bayesian Nested Monte Carlo Simulation Under Data Deficiencies
Synthetization, Distortion, and Geometric Correction of Isoelectric Focusing Gels for Newborn Screening
On Similarity Measures of Complex Picture Fuzzy Sets With Applications in the Field of Pattern Recognition
An FPGA Compliant Single-Rail Encoded Asynchronous Pipeline
Cnnformer: Transformer-Based Semantic Information Enhancement Framework for Behavior Recognition
Voice-Activated Smart Home Controller Using Machine Learning
New Quantum Codes and (θ, δ, β)-Cyclic Codes
Machine Learning Approach for Graphical Model-Based Analysis of Energy-Aware Growth Control in Plant Factories
Space Object Recognition With Stacking of CoAtNets Using Fusion of RGB and Depth Images
Cross-Domain Limitations of Neural Models on Biomedical Relation Classification
Adaptive Nonlinear Control of Unified Model of Fuel Cell, Battery, Ultracapacitor and Induction Motor Based Hybrid Electric Vehicles
Big Data and I2X Communication Infrastructure for Traffic Optimization and Accident Prevention on Automated Roads
A Novel Variable Flux Spoke Type Permanent Magnet Motor With Swiveling Magnetization for Electric Vehicles
Convergence Analysis of Caputo-Type Fractional Order Complex-Valued Neural Networks
Particle PHD Filter Based Multiple Human Tracking Using Online Group-Structured Dictionary Learning
Optimal Modified Performance of MIMO Networked Control Systems With Packet Dropouts and Bandwidth Constraints
A Metasurface-Based MIMO Antenna With Compact, Wideband, and High Isolation Characteristics for Sub-6 GHz 5G Applications
Improved Jaya Algorithm for Economic Dispatch Considering Valve-Point Effect and Multi-Fuel Options
Early-Stage Risk Prediction of Non-Communicable Disease Using Machine Learning in Health CPS
A Link Quality Prediction Method for Wireless Sensor Networks Based on XGBoost
ML-Based Classification of Device Environment Using Wi-Fi and Cellular Signal Measurements
Blurring-Effect-Free CNN Network of Structural Edge for Focus Stacking
Novel Diplexer and Triplexer Designs Avoiding Additional Matching Circuits Outside Filters
Hybrid Symbiotic Differential Evolution Moth-Flame Optimization Algorithm for Estimating Parameters of Photovoltaic Models
Multiscale Block Fusion Object Detection Method for Large-Scale High-Resolution Remote Sensing Imagery
Solar Probability Density Estimation Using Adaptive Parametric/Nonparametric Hybrid Model
Applying Machine Learning on Big Data With Apache Spark
Learning Camera Parameters With Weighted Edge Attention From Single-View Images
Research on Intelligent Constellation Map Monitoring for Fiber Optic Communication Based on Small Sample Learning Network
Enhanced Industrial Machinery Condition Monitoring Methodology Based on Novelty Detection and Multi-Modal Analysis
Multimodal Coherence-Correlation Fusion of EEG and ECoG Signals for Enhanced Epileptic Seizure Detection Using Discrete Lyapunov Wavelet Transform
Efficient Real-Time Pathfinding for Visually Impaired Individuals
Fuzzy Based Particle Swarm Optimization for Modeling Home Appliances Towards Energy Saving and Cost Reduction Under Demand Response Consideration
Assessment of Scientific Creative-Potential by Near-Infrared Spectroscopy Using Brain-Network-Based Deep-Fuzzy Classifier
Improved Deep Neural Network for OFDM Signal Recognition Using Hybrid Grey Wolf Optimization
On the Connectivity of Vehicular Ad Hoc Network Under Various Mobility Scenarios
A Third Harmonic Current Elimination Strategy for Symmetrical Six-Phase Permanent Magnet Synchronous Motor
Predicting Ultra-Short-Term Wind Power Combinations Under Extreme Weather Conditions
A Hierarchical Data-Partitioning Algorithm for Performance Optimization of Data-Parallel Applications on Heterogeneous Multi-Accelerator NUMA Nodes
Porosity Prediction and Uncertainty Estimation in Tight Sandstone Reservoir Using Non-Deterministic XGBoost
Production Wastage Avoidance Using Modified Multi-Objective Teaching Learning Based Optimization Embedded With Refined Learning Scheme
Graph Deep Learning: State of the Art and Challenges
Positive Streamer Initiation in SF 6 /CO 2 Based on Zener's Field Ionization
Research on Vertical Overlap of the Paired Approach Based on QAR
Multi-Model Attentional Fusion Ensemble for Accurate Skin Cancer Classification
Effective Inertial Response With New Coordinated Control for Multiple WPPs
Meta Lifelong-Learning With Selective and Task-Aware Adaptation
An Embedded System for Acoustic Data Processing and AI-Based Real-Time Classification for Road Surface Analysis
SHA-2 Acceleration Meeting the Needs of Emerging Applications: A Comparative Survey
Generalized Circuit Topology of Qn-Hybrid-NPC Multilevel Converter With Novel Decomposed Sensor-Less Modulation Method
Assessing the Value of Proactive Microgrid Scheduling
Frequency-Multiplexed Array Digitization for MIMO Receivers: 4-Antennas/ADC at 28 GHz on Xilinx ZCU-1285 RF SoC
Parabolic Airdrop Trajectory Planning for Multirotor Unmanned Aerial Vehicles
CPFuzz: Combining Fuzzing and Falsification of Cyber-Physical Systems
Latency-Aware Dynamic Resource Allocation Scheme for Multi-Tier 5G Network: A Network Slicing-Multitenancy Scenario
A Systematic Study of Tiny YOLO3 Inference: Toward Compact Brainware Processor With Less Memory and Logic Gate
Multi-Depot Split-Delivery Vehicle Routing Problem