Strategic Plans for the Fusion DEMO Program of Korea
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 433-440
Power Plant, Demo, and FNSF / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST60-433
Fusion Nuclear Science Facility (FNSF) Before Upgrade to Component Test Facility (CTF)
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 441-448
Power Plant, Demo, and FNSF / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST60-441
Fusion Nuclear Science Facility - Advanced Tokamak Option
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 449-453
Power Plant, Demo, and FNSF / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST60-449
Development of an Extreme Environment Materials Research Facility at Princeton
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 454-458
Power Plant, Demo, and FNSF / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST60-454
Development of a Visualization Tool for the ARIES Systems Code
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 459-463
Power Plant, Demo, and FNSF / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST60-459
FRC Based Fusion Neutron Source for Materials Evaluation
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 464-469
Power Plant, Demo, and FNSF / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST60-464
A Technique for Producing Large Dual-Layer Pellets in Support of Disruption Mitigation Experiments
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 473-479
Plasma Engineering - Fueling and Diagnostics / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST60-473
Modeling of an Ablation-Free Electrothermal Plasma Pellet Accelerator
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 480-485
Plasma Engineering - Fueling and Diagnostics / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST60-480
Visco-Plastic Flow Predictions of Solidified Deuterium-Tritium Mixtures
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 486-490
Plasma Engineering - Fueling and Diagnostics / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST60-486
Development of PC-Based Control System in JT-60SA
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 491-495
Plasma Engineering - Fueling and Diagnostics / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST60-491
Architecture Plan of the Real-Time Diagnostic Signals Acquisition System Toward JT-60SA Project
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 496-500
Plasma Engineering - Fueling and Diagnostics / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST60-496
Development of a Compact Diagnostic System for Monitoring Hard X-Rays
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 501-505
Plasma Engineering - Fueling and Diagnostics / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST60-501
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 506-510
Plasma Engineering - Fueling and Diagnostics / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST60-506
3D Numerical Study of MHD Flow in a Rectangular Duct with a Flow Channel Insert
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 513-517
Blanket Design and Experiments / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12433
Stability Analysis for Buoyancy-Opposed Flows in Poloidal Ducts of the DCLL Blanket
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 518-522
Blanket Design and Experiments / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST60-518
Feasibility Study of Flibe Blanket with Cs
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 523-527
Blanket Design and Experiments / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12435
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 528-532
Blanket Design and Experiments / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12436
Impact of Neutronics on the Determination of a Radial Build of Tokamak Reactor Systems
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 533-537
Blanket Design and Experiments / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12437
Evaluation of the Electroforming Technique for IFMIF-EVEDA Beam Dump Manufacturing
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 538-543
Blanket Design and Experiments / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12438
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 544-548
Blanket Design and Experiments / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12439
Design Study of Remote Handling System for Lower Divertor Cassettes in JT-60SA
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 549-553
Blanket Design and Experiments / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12440
Mock-up Divertor of KTM Tokamak on the Basis of Lithium CPS
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 554-557
Blanket Design and Experiments / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12441
Design of Tritium Collecting System from LiPb and LiPb Dropping Experiment
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 558-562
Blanket Design and Experiments / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12442
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 565-569
IFE Design & Technology / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12443
Three-Dimensional `Textured' Coatings as First-Wall Materials: Exposure to Energetic Ions on RHEPP-1
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 570-578
IFE Design & Technology / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12444
Waste Management Assessment of Candidate Materials for HiPER Reaction Chamber
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 579-584
IFE Design & Technology / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12445
Investigation of Condensed Liquid Film Flow on Chamber Ceiling of Laser-Fusion Reactor
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 585-589
IFE Design & Technology / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12446
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 590-594
IFE Design & Technology / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12447
Planning Tools for Estimating Radiation Exposure at the National Ignition Facility
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 595-599
IFE Design & Technology / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST10-196
Benchmarks for Verification of HEDP/IFE Codes
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 600-604
IFE Design & Technology / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12449
New Insight into Gridded Inertial Electrostatic Confinement (IEC) Fusion Devices
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 607-614
Alternate Concepts & Magnets / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST10-283
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 615-619
Alternate Concepts & Magnets / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12451
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 620-624
Alternate Concepts & Magnets / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12452
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 625-629
Alternate Concepts & Magnets / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12453
A Verification Scenario of Ion-Heating Enhancement due to Nuclear Plus Interference Scattering
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 630-634
Alternate Concepts & Magnets / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12454
Status of High Temperature Superconducting Fusion Magnet Development
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 635-642
Alternate Concepts & Magnets / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12455
Stellarator Configuration Improvement Using High Temperature Superconducting Monoliths
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 643-647
Alternate Concepts & Magnets / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12456
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 648-652
Alternate Concepts & Magnets / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST60-648
Integration of the ITER in Vessel Coil System
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 653-657
Alternate Concepts & Magnets / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12458
Analysis of NSTX Upgrade OH Magnet and Center Stack
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 658-663
Alternate Concepts & Magnets / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12459
Thermal, Electromagnetic and Structural Analysis of NSTX TF Coil
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 664-668
Alternate Concepts & Magnets / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12460
Neutronics Analysis in Support of the Fusion Development Facility Design Evolution
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 671-675
Nuclear Analysis & Experiments / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12461
Global Evaluation of Prompt Dose Rates in ITER Using Hybrid Monte Carlo/Deterministic Techniques
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 676-680
Nuclear Analysis & Experiments / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12462
Measurement of Reaction Rates in Li/V-Alloy Assembly with 14 MeV Neutron Irradiation
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 681-686
Nuclear Analysis & Experiments / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12463
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 687-691
Nuclear Analysis & Experiments / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12464
Adjoint-Based Uncertainty Analysis for Essential Reactions in a Laser Inertial Fusion Engine
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 692-697
Nuclear Analysis & Experiments / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST10-291
Investigation of Observed Peaking in Nuclear Parameters at Steel/Water Interfaces
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 698-702
Nuclear Analysis & Experiments / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12466
Assessment of the Surface Source Approach in 3-D Fusion Neutronics Analysis
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 703-707
Nuclear Analysis & Experiments / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12467
Neutronic Analyses for the Upper Ports in the Neutral Beam Cell of ITER
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 708-714
Nuclear Analysis & Experiments / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12468
Activation and Radiation Damage Characteristics of W-Based Divertor of ARIES Power Plants
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 715-719
Nuclear Analysis & Experiments / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12469
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 720-724
Nuclear Analysis & Experiments / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12470
Neutronics Studies for a Compact, High-Field Tokamak Neutron Source
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 725-729
Nuclear Analysis & Experiments / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12471
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 730-737
Nuclear Analysis & Experiments / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12472
Activation Analysis for a He/LiPb Dual Coolant Blanket for DEMO Reactor
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 738-742
Nuclear Analysis & Experiments / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST60-738
Exploration of Clearance Strategy for an Advanced-Fuel Fusion Experimental Device
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 743-747
Nuclear Analysis & Experiments / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12474
Challenges of Fusion Power Plant Licensing: Differences and Commonalities with Existing Systems
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 751-759
Safety & Environment / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12475
Post-Shot Radiation Environment Following Low-Yield Shots Inside the National Ignition Facility
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 760-764
Safety & Environment / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST10-192
Radioactive Safety Estimates for ITER TBM Systems
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 765-770
Safety & Environment / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12477
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 771-775
Safety & Environment / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12478
Personnel Dose Assessment at the PRIMA Neutral Beam Test Facility
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 776-780
Safety & Environment / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12479
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 781-785
Safety & Environment / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12480
Safety Analyses for CANDOR, an Advanced-Fuel Fusion Device
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 786-790
Safety & Environment / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12481
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 793-797
Computational Tools, Modeling & Validation / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12482
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 798-803
Computational Tools, Modeling & Validation / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12483
Aerosol Formation and Hydrogen Co-Deposition by Colliding Ablation Plasma Plumes of Carbon
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 804-808
Computational Tools, Modeling & Validation / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12484
Tritium Transport in Poloidal Flows of a DCLL Blanket
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 809-813
Computational Tools, Modeling & Validation / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST10-309
Modeling Tritium Transport in PbLi Breeder Blankets Under Steady State
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 814-818
Computational Tools, Modeling & Validation / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST60-814
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 819-824
Computational Tools, Modeling & Validation / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12487
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 825-829
Computational Tools, Modeling & Validation / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12488
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 830-834
Computational Tools, Modeling & Validation / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12489
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 835-839
Computational Tools, Modeling & Validation / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12490
Experimental Investigation on Anisotropic Effective Thermal Conductivity of Pebble Bed
Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 840-844
Computational Tools, Modeling & Validation / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2) / dx.doi.org/10.13182/FST11-A12491