World

i10 Productivity
Rankings

Institute of Management ScientistsOthers i10 Productivity Rankings 2024

Productivity Rankings is a unique service offered only by “AD Scientific Index”. This is a ranking system derived from the i10 index in order to show the productivity of the scientist in publishing scientific articles of value. Productivity Rankings is an instrument that lists productive scientists in a given area, discipline, university, and country and can guide the development of meaningful incentives and academic policies. The world rankings, regional rankings, and university rankings of scientists in this table are developed based on the total i10 index. Click for "last 6 years' i10 index". Also see: Universities Rankings 2024 (Sort by : Total i10 Index)  and Universities Rankings 2024 (Sort by : Last 6 Years i10 Index)

search
×
Total 1,480 scientist
Christoph Hegg
Christoph Hegg
Swiss Federal Institute for Forest, Snow and Landscape Research WSL
Swiss Federal Institute for Forest, Snow and Landscape Research WSL
Switzerland
Others
natural hazards
management of research institutions
i10 Productivity Rankings
University / Institution:
# 70
Country:
# 5,066
Region:
# 168,719
World:
# 460,461
i10 Index
Total:
30
Last 6 Year:
11
Last 6 Year/Total:
0.367
H-Index
Total:
18
Last 6 Year:
10
Last 6 Year/Total:
0.556
Citation
Total:
1,696
Last 6 Year:
475
Last 6 Year/Total:
0.280
Zhenis Kembayev
Zhenis Kembayev
Kazakhstan Institute of Management Economics and Strategic Research KIMEP University
Kazakhstan Institute of Management Economics and Strategic Research KIMEP University
Kazakhstan
Others
i10 Productivity Rankings
University / Institution:
# 2
Country:
# 169
Region:
# 94,288
World:
# 461,072
i10 Index
Total:
30
Last 6 Year:
8
Last 6 Year/Total:
0.267
H-Index
Total:
17
Last 6 Year:
9
Last 6 Year/Total:
0.529
Citation
Total:
876
Last 6 Year:
336
Last 6 Year/Total:
0.384
Chotchai Charoenngam
Chotchai Charoenngam
Asian Institute of Technology Thailand
Asian Institute of Technology Thailand
Thailand
Others
Project Management
i10 Productivity Rankings
University / Institution:
# 30
Country:
# 1,076
Region:
# 96,196
World:
# 468,655
i10 Index
Total:
29
Last 6 Year:
22
Last 6 Year/Total:
0.759
H-Index
Total:
21
Last 6 Year:
16
Last 6 Year/Total:
0.762
Citation
Total:
1,779
Last 6 Year:
836
Last 6 Year/Total:
0.470
Piyush Kant Pandey
Piyush Kant Pandey
Indian Institute of Management Indore
Indian Institute of Management Indore
India
Others
Environmental Health & Pollution
Strategic Organizational Behaviour
i10 Productivity Rankings
University / Institution:
# 5
Country:
# 15,090
Region:
# 96,903
World:
# 471,917
i10 Index
Total:
29
Last 6 Year:
17
Last 6 Year/Total:
0.586
H-Index
Total:
22
Last 6 Year:
15
Last 6 Year/Total:
0.682
Citation
Total:
1,810
Last 6 Year:
650
Last 6 Year/Total:
0.359
Shivika Mittal
Shivika Mittal
Indian Institute of Management Ahmedabad
Indian Institute of Management Ahmedabad
India
Others
i10 Productivity Rankings
University / Institution:
# 13
Country:
# 15,211
Region:
# 97,551
World:
# 475,839
i10 Index
Total:
28
Last 6 Year:
28
Last 6 Year/Total:
1.000
H-Index
Total:
23
Last 6 Year:
21
Last 6 Year/Total:
0.913
Citation
Total:
1,628
Last 6 Year:
1,480
Last 6 Year/Total:
0.909
Sayantani Dutta
Sayantani Dutta
National Institute of Food Technology Entrepreneurship and Management
National Institute of Food Technology Entrepreneurship and Management
India
Others
Extraction
supercritical
encapsulation
liposome
food fortification
i10 Productivity Rankings
University / Institution:
# 14
Country:
# 15,278
Region:
# 98,117
World:
# 477,753
i10 Index
Total:
28
Last 6 Year:
27
Last 6 Year/Total:
0.964
H-Index
Total:
17
Last 6 Year:
16
Last 6 Year/Total:
0.941
Citation
Total:
1,377
Last 6 Year:
1,319
Last 6 Year/Total:
0.958
Matteo Sottocornola
Matteo Sottocornola
Waterford Institute of Technology
Waterford Institute of Technology
Ireland
Others
carbon and water cycles
ecosystem productivity and functioning
ecosystems' sustainable management
eddy-covariance
plant ecol
i10 Productivity Rankings
University / Institution:
# 14
Country:
# 2,218
Region:
# 174,778
World:
# 477,898
i10 Index
Total:
28
Last 6 Year:
26
Last 6 Year/Total:
0.929
H-Index
Total:
24
Last 6 Year:
18
Last 6 Year/Total:
0.750
Citation
Total:
4,269
Last 6 Year:
2,163
Last 6 Year/Total:
0.507
Liangchao Zou
Liangchao Zou
Royal Institute of Technology
Royal Institute of Technology
Sweden
Others
coupled processes in fractured rocks
rock grouting
groundwater flow management
i10 Productivity Rankings
University / Institution:
# 616
Country:
# 7,142
Region:
# 179,885
World:
# 492,355
i10 Index
Total:
27
Last 6 Year:
26
Last 6 Year/Total:
0.963
H-Index
Total:
19
Last 6 Year:
19
Last 6 Year/Total:
1.000
Citation
Total:
1,372
Last 6 Year:
1,228
Last 6 Year/Total:
0.895
Christine Nya Ling Tan|Tan Nya Ling, Nya Ling Tan, Christine Tan Nya Ling
Christine Nya Ling Tan|Tan Nya Ling, Nya Ling Tan, Christine Tan Nya Ling
Auckland Institute of Studies
Auckland Institute of Studies
New Zealand
Others
Knowledge management (knowledge sharing)
information systems
consumer behaviour
tech management
i10 Productivity Rankings
University / Institution:
# 1
Country:
# 2,808
Region:
# 23,074
World:
# 496,433
i10 Index
Total:
27
Last 6 Year:
22
Last 6 Year/Total:
0.815
H-Index
Total:
22
Last 6 Year:
20
Last 6 Year/Total:
0.909
Citation
Total:
1,906
Last 6 Year:
1,455
Last 6 Year/Total:
0.763
Jagat J Rath
Jagat J Rath
Institute of Infrastructure Technology Research and Management
Institute of Infrastructure Technology Research and Management
India
Others
Estimation & Control
Autonomous Vehicles
Shared Control
i10 Productivity Rankings
University / Institution:
# 9
Country:
# 16,008
Region:
# 102,400
World:
# 496,820
i10 Index
Total:
27
Last 6 Year:
22
Last 6 Year/Total:
0.815
H-Index
Total:
19
Last 6 Year:
18
Last 6 Year/Total:
0.947
Citation
Total:
1,271
Last 6 Year:
1,011
Last 6 Year/Total:
0.795
Adscientificindex
Adscientificindex

Click for INSTITUTIONAL BULK REGISTRATION and PREMIUM MEMBERSHIP advantages

Jay Singh
Jay Singh
GL Bajaj Institute of Technology and Management
GL Bajaj Institute of Technology and Management
India
Others
Model Order Reduction
TDF IMC
i10 Productivity Rankings
University / Institution:
# 7
Country:
# 16,132
Region:
# 103,111
World:
# 499,854
i10 Index
Total:
27
Last 6 Year:
19
Last 6 Year/Total:
0.704
H-Index
Total:
16
Last 6 Year:
13
Last 6 Year/Total:
0.813
Citation
Total:
1,197
Last 6 Year:
765
Last 6 Year/Total:
0.639
Nicolas Mayer
Nicolas Mayer
Luxembourg Institute of Science and Technology
Luxembourg Institute of Science and Technology
Luxembourg
Others
Information security
Risk management
GRC
i10 Productivity Rankings
University / Institution:
# 72
Country:
# 289
Region:
# 183,673
World:
# 503,370
i10 Index
Total:
27
Last 6 Year:
13
Last 6 Year/Total:
0.481
H-Index
Total:
18
Last 6 Year:
11
Last 6 Year/Total:
0.611
Citation
Total:
1,411
Last 6 Year:
532
Last 6 Year/Total:
0.377
Shikha Singh
Shikha Singh
Indian Institute of Technology IIT Kanpur
Indian Institute of Technology IIT Kanpur
India
Others
Product Lifecycle Management
Business Process Management
i10 Productivity Rankings
University / Institution:
# 213
Country:
# 16,330
Region:
# 103,969
World:
# 504,400
i10 Index
Total:
27
Last 6 Year:
11
Last 6 Year/Total:
0.407
H-Index
Total:
11
Last 6 Year:
10
Last 6 Year/Total:
0.909
Citation
Total:
1,442
Last 6 Year:
711
Last 6 Year/Total:
0.493
Rayees Farooq
Rayees Farooq
Indian Institute of Technology IIT Guwahati
Indian Institute of Technology IIT Guwahati
India
Others
Knowledge Management
Performance Management
Counterproductive work behaviors
Scale Development
i10 Productivity Rankings
University / Institution:
# 89
Country:
# 16,373
Region:
# 104,184
World:
# 505,909
i10 Index
Total:
26
Last 6 Year:
26
Last 6 Year/Total:
1.000
H-Index
Total:
23
Last 6 Year:
23
Last 6 Year/Total:
1.000
Citation
Total:
1,745
Last 6 Year:
1,664
Last 6 Year/Total:
0.954
Payal Mazumder
Payal Mazumder
Indian Institute of Technology IIT Guwahati
Indian Institute of Technology IIT Guwahati
India
Others
Environmental microbiology
Bioremediation
Antibiotic resistance
Solid waste management
i10 Productivity Rankings
University / Institution:
# 94
Country:
# 17,015
Region:
# 107,857
World:
# 522,294
i10 Index
Total:
25
Last 6 Year:
25
Last 6 Year/Total:
1.000
H-Index
Total:
20
Last 6 Year:
20
Last 6 Year/Total:
1.000
Citation
Total:
1,916
Last 6 Year:
1,873
Last 6 Year/Total:
0.978
Ningyuan Guo（郭宁远）
Ningyuan Guo（郭宁远）
Beijing Institute of Technology
Beijing Institute of Technology
China
Others
vehicle dynamics control
distributed drive electric vehicles
energy management
autonomous
i10 Productivity Rankings
University / Institution:
# 289
Country:
# 25,201
Region:
# 107,889
World:
# 522,396
i10 Index
Total:
25
Last 6 Year:
25
Last 6 Year/Total:
1.000
H-Index
Total:
20
Last 6 Year:
20
Last 6 Year/Total:
1.000
Citation
Total:
1,325
Last 6 Year:
1,308
Last 6 Year/Total:
0.987
Abdul Latif
Abdul Latif
National Institute of Technology Silchar
National Institute of Technology Silchar
India
Others
Demand side management
Microgrid frequency response analysis
Automatic power-frequency management
i10 Productivity Rankings
University / Institution:
# 51
Country:
# 17,017
Region:
# 107,904
World:
# 522,433
i10 Index
Total:
25
Last 6 Year:
25
Last 6 Year/Total:
1.000
H-Index
Total:
20
Last 6 Year:
20
Last 6 Year/Total:
1.000
Citation
Total:
1,122
Last 6 Year:
1,119
Last 6 Year/Total:
0.997
Prasanna Kumar GV
Prasanna Kumar GV
National Institute of Food Technology Entrepreneurship and Management
National Institute of Food Technology Entrepreneurship and Management
India
Others
Post Harvest Engineering
Design of Food Processing Equipment
Renewable sources of energy
Waste recycling
Soft computing Appl
i10 Productivity Rankings
University / Institution:
# 19
Country:
# 17,269
Region:
# 109,674
World:
# 529,470
i10 Index
Total:
25
Last 6 Year:
20
Last 6 Year/Total:
0.800
H-Index
Total:
18
Last 6 Year:
15
Last 6 Year/Total:
0.833
Citation
Total:
1,295
Last 6 Year:
684
Last 6 Year/Total:
0.528
Rahul Kumar Roy
Rahul Kumar Roy
Indian Institute of Management Calcutta
Indian Institute of Management Calcutta
India
Others
System dynamics modelling
Information Technology adoption and use
Health Services Systems
i10 Productivity Rankings
University / Institution:
# 10
Country:
# 17,615
Region:
# 111,288
World:
# 537,332
i10 Index
Total:
25
Last 6 Year:
9
Last 6 Year/Total:
0.360
H-Index
Total:
16
Last 6 Year:
9
Last 6 Year/Total:
0.563
Citation
Total:
1,079
Last 6 Year:
233
Last 6 Year/Total:
0.216
Osamu Akashi
Osamu Akashi
National Institute of Informatics, Japan
National Institute of Informatics, Japan
Japan
Others
Network Architecture
Network Management
i10 Productivity Rankings
University / Institution:
# 50
Country:
# 11,620
Region:
# 111,295
World:
# 537,379
i10 Index
Total:
25
Last 6 Year:
9
Last 6 Year/Total:
0.360
H-Index
Total:
15
Last 6 Year:
9
Last 6 Year/Total:
0.600
Citation
Total:
2,977
Last 6 Year:
2,118
Last 6 Year/Total:
0.711
Naga Vamsi Krishna Jasti
Naga Vamsi Krishna Jasti
Birla Institute of Technology & Science Pilani
Birla Institute of Technology & Science Pilani
India
Others
Lean Thinking
Green Thinking
Total Quality Management
Manufacturing Excellence and World Class Manufacturing
i10 Productivity Rankings
University / Institution:
# 148
Country:
# 17,732
Region:
# 112,170
World:
# 541,087
i10 Index
Total:
24
Last 6 Year:
23
Last 6 Year/Total:
0.958
H-Index
Total:
18
Last 6 Year:
17
Last 6 Year/Total:
0.944
Citation
Total:
2,048
Last 6 Year:
1,486
Last 6 Year/Total:
0.726
Rebekka Volk
Rebekka Volk
Karlsruhe Institute of Technology (Universität Karlsruhe)
Karlsruhe Institute of Technology (Universität Karlsruhe)
Germany
Others
resource management
circular economy
built environment
i10 Productivity Rankings
University / Institution:
# 534
Country:
# 18,635
Region:
# 197,728
World:
# 543,511
i10 Index
Total:
24
Last 6 Year:
22
Last 6 Year/Total:
0.917
H-Index
Total:
13
Last 6 Year:
13
Last 6 Year/Total:
1.000
Citation
Total:
3,374
Last 6 Year:
2,456
Last 6 Year/Total:
0.728
Nb Dev Choudhury
Nb Dev Choudhury
National Institute of Technology Silchar
National Institute of Technology Silchar
India
Others
Deregulated power system
smart grid
energy management
Power system Reliability
i10 Productivity Rankings
University / Institution:
# 55
Country:
# 18,111
Region:
# 114,217
World:
# 549,674
i10 Index
Total:
24
Last 6 Year:
17
Last 6 Year/Total:
0.708
H-Index
Total:
15
Last 6 Year:
12
Last 6 Year/Total:
0.800
Citation
Total:
1,152
Last 6 Year:
948
Last 6 Year/Total:
0.823
Fang Zheng
Fang Zheng
Georgia Institute of Technology
Georgia Institute of Technology
United States
Others
Parallel I/O
Scientific Data Management
Data Stream Processing
i10 Productivity Rankings
University / Institution:
# 983
Country:
# 146,769
Region:
# 165,849
World:
# 553,270
i10 Index
Total:
24
Last 6 Year:
12
Last 6 Year/Total:
0.500
H-Index
Total:
17
Last 6 Year:
12
Last 6 Year/Total:
0.706
Citation
Total:
1,774
Last 6 Year:
424
Last 6 Year/Total:
0.239
Christian Johansson|Christian Johansson Askling, Christian M Johansson
Christian Johansson|Christian Johansson Askling, Christian M Johansson
Blekinge Institute of Technology
Blekinge Institute of Technology
Sweden
Others
Knowledge Management
Product Development
Engineering Design
Decision Making
Product-Service Systems
i10 Productivity Rankings
University / Institution:
# 47
Country:
# 8,029
Region:
# 201,239
World:
# 553,571
i10 Index
Total:
24
Last 6 Year:
12
Last 6 Year/Total:
0.500
H-Index
Total:
15
Last 6 Year:
10
Last 6 Year/Total:
0.667
Citation
Total:
685
Last 6 Year:
405
Last 6 Year/Total:
0.591
AD Scientific Index - World Scientists i10 Productivity Rankings - 2024 i10 INDEX H INDEX CITATION
University Country Region World Name Country University / Institution Subject Total Last 6 Year Last 6 year/total Total Last 6 year Last 6 year/total Total Last 6 year Last 6 year/total
70 5,066 168,719 460,461
Christoph HeggChristoph Hegg
Switzerland Switzerland Swiss Federal Institute for Forest, Snow and Landscape Research WSL Swiss Federal Institute for Forest, Snow and Landscape Research WSL Others

natural hazards | management of research institutions |

30 11 0.367 18 10 0.556 1,696 475 0.280
2 169 94,288 461,072
Zhenis KembayevZhenis Kembayev
Kazakhstan Kazakhstan Kazakhstan Institute of Management Economics and Strategic Research KIMEP University Kazakhstan Institute of Management Economics and Strategic Research KIMEP University Others

30 8 0.267 17 9 0.529 876 336 0.384
30 1,076 96,196 468,655
Chotchai CharoenngamChotchai Charoenngam
Thailand Thailand Asian Institute of Technology Thailand Asian Institute of Technology Thailand Others

Project Management |

29 22 0.759 21 16 0.762 1,779 836 0.470
5 15,090 96,903 471,917
Piyush Kant PandeyPiyush Kant Pandey
India India Indian Institute of Management Indore Indian Institute of Management Indore Others

Environmental Health & Pollution | Strategic Organizational Behaviour |

29 17 0.586 22 15 0.682 1,810 650 0.359
13 15,211 97,551 475,839
Shivika MittalShivika Mittal
India India Indian Institute of Management Ahmedabad Indian Institute of Management Ahmedabad Others

28 28 1.000 23 21 0.913 1,628 1,480 0.909
14 15,278 98,117 477,753
Sayantani DuttaSayantani Dutta
India India National Institute of Food Technology Entrepreneurship and Management National Institute of Food Technology Entrepreneurship and Management Others

Extraction | supercritical | encapsulation | liposome | food fortification |

28 27 0.964 17 16 0.941 1,377 1,319 0.958
14 2,218 174,778 477,898
Matteo SottocornolaMatteo Sottocornola
Ireland Ireland Waterford Institute of Technology Waterford Institute of Technology Others

carbon and water cycles | ecosystem productivity and functioning | ecosystems' sustainable management | eddy-covariance | plant ecol |

28 26 0.929 24 18 0.750 4,269 2,163 0.507
616 7,142 179,885 492,355
Liangchao ZouLiangchao Zou
Sweden Sweden Royal Institute of Technology Royal Institute of Technology Others

coupled processes in fractured rocks | rock grouting | groundwater flow management |

27 26 0.963 19 19 1.000 1,372 1,228 0.895
1 2,808 23,074 496,433
Christine Nya Ling Tan|Tan Nya Ling, Nya Ling Tan, Christine Tan Nya LingChristine Nya Ling Tan|Tan Nya Ling, Nya Ling Tan, Christine Tan Nya Ling
New Zealand New Zealand Auckland Institute of Studies Auckland Institute of Studies Others

Knowledge management (knowledge sharing) | information systems | consumer behaviour | tech management |

27 22 0.815 22 20 0.909 1,906 1,455 0.763
9 16,008 102,400 496,820
Jagat J RathJagat J Rath
India India Institute of Infrastructure Technology Research and Management Institute of Infrastructure Technology Research and Management Others

Estimation & Control | Autonomous Vehicles | Shared Control |

27 22 0.815 19 18 0.947 1,271 1,011 0.795
Adscientificindex

Click for INSTITUTIONAL BULK REGISTRATION and PREMIUM MEMBERSHIP advantages

 Adscientificindex
7 16,132 103,111 499,854
Jay SinghJay Singh
India India GL Bajaj Institute of Technology and Management GL Bajaj Institute of Technology and Management Others

Model Order Reduction | TDF IMC |

27 19 0.704 16 13 0.813 1,197 765 0.639
72 289 183,673 503,370
Nicolas MayerNicolas Mayer
Luxembourg Luxembourg Luxembourg Institute of Science and Technology Luxembourg Institute of Science and Technology Others

Information security | Risk management | GRC |

27 13 0.481 18 11 0.611 1,411 532 0.377
213 16,330 103,969 504,400
Shikha SinghShikha Singh
India India Indian Institute of Technology IIT Kanpur Indian Institute of Technology IIT Kanpur Others

Product Lifecycle Management | Business Process Management |

27 11 0.407 11 10 0.909 1,442 711 0.493
89 16,373 104,184 505,909
Rayees FarooqRayees Farooq
India India Indian Institute of Technology IIT Guwahati Indian Institute of Technology IIT Guwahati Others

Knowledge Management | Performance Management | Counterproductive work behaviors | Scale Development |

26 26 1.000 23 23 1.000 1,745 1,664 0.954
94 17,015 107,857 522,294
Payal MazumderPayal Mazumder
India India Indian Institute of Technology IIT Guwahati Indian Institute of Technology IIT Guwahati Others

Environmental microbiology | Bioremediation | Antibiotic resistance | Solid waste management |

25 25 1.000 20 20 1.000 1,916 1,873 0.978
289 25,201 107,889 522,396
Ningyuan Guo（郭宁远）Ningyuan Guo（郭宁远）
China China Beijing Institute of Technology Beijing Institute of Technology Others

vehicle dynamics control | distributed drive electric vehicles | energy management | autonomous |

25 25 1.000 20 20 1.000 1,325 1,308 0.987
51 17,017 107,904 522,433
Abdul LatifAbdul Latif
India India National Institute of Technology Silchar National Institute of Technology Silchar Others

Demand side management | Microgrid frequency response analysis | Automatic power-frequency management |

25 25 1.000 20 20 1.000 1,122 1,119 0.997
19 17,269 109,674 529,470
Prasanna Kumar GVPrasanna Kumar GV
India India National Institute of Food Technology Entrepreneurship and Management National Institute of Food Technology Entrepreneurship and Management Others

Post Harvest Engineering | Design of Food Processing Equipment | Renewable sources of energy | Waste recycling | Soft computing Appl |

25 20 0.800 18 15 0.833 1,295 684 0.528
10 17,615 111,288 537,332
Rahul Kumar RoyRahul Kumar Roy
India India Indian Institute of Management Calcutta Indian Institute of Management Calcutta Others

System dynamics modelling | Information Technology adoption and use | Health Services Systems |

25 9 0.360 16 9 0.563 1,079 233 0.216
50 11,620 111,295 537,379
Osamu AkashiOsamu Akashi
Japan Japan National Institute of Informatics, Japan National Institute of Informatics, Japan Others

Network Architecture | Network Management |

25 9 0.360 15 9 0.600 2,977 2,118 0.711
148 17,732 112,170 541,087
Naga Vamsi Krishna JastiNaga Vamsi Krishna Jasti
India India Birla Institute of Technology & Science Pilani Birla Institute of Technology & Science Pilani Others

Lean Thinking | Green Thinking | Total Quality Management | Manufacturing Excellence and World Class Manufacturing |

24 23 0.958 18 17 0.944 2,048 1,486 0.726
534 18,635 197,728 543,511
Rebekka VolkRebekka Volk
Germany Germany Karlsruhe Institute of Technology (Universität Karlsruhe) Karlsruhe Institute of Technology (Universität Karlsruhe) Others

resource management | circular economy | built environment |

24 22 0.917 13 13 1.000 3,374 2,456 0.728
55 18,111 114,217 549,674
Nb Dev ChoudhuryNb Dev Choudhury
India India National Institute of Technology Silchar National Institute of Technology Silchar Others

Deregulated power system | smart grid | energy management | Power system Reliability |

24 17 0.708 15 12 0.800 1,152 948 0.823
983 146,769 165,849 553,270
Fang ZhengFang Zheng
United States United States Georgia Institute of Technology Georgia Institute of Technology Others

Parallel I/O | Scientific Data Management | Data Stream Processing |

24 12 0.500 17 12 0.706 1,774 424 0.239
47 8,029 201,239 553,571
Christian Johansson|Christian Johansson Askling, Christian M JohanssonChristian Johansson|Christian Johansson Askling, Christian M Johansson
Sweden Sweden Blekinge Institute of Technology Blekinge Institute of Technology Others

Knowledge Management | Product Development | Engineering Design | Decision Making | Product-Service Systems |

24 12 0.500 15 10 0.667 685 405 0.591