Class information for:
Level 1: OPTICAL PICKUP//OPTICAL HEAD//DIGITAL VERSATILE DISC

Basic class information
Bar chart of Publication_year

Last years might be incomplete

Hierarchy of classes
The table includes all classes above and classes immediately below the current class.


Cluster id Level Cluster label #P
1 4 PHYSICS, CONDENSED MATTER//PHYSICS, APPLIED//MATERIALS SCIENCE, MULTIDISCIPLINARY 2188495
556 3       CHALCOGENIDE GLASSES//CHALCOGENIDES//PHASE CHANGE MEMORY 18113
1276 2             PHASE CHANGE MEMORY//OPTICAL DISK//GE2SB2TE5 9078
21864 1                   OPTICAL PICKUP//OPTICAL HEAD//DIGITAL VERSATILE DISC 426

Terms with highest relevance score


rank Category termType chi_square shrOfCwithTerm shrOfTermInClass termInClass
1 OPTICAL PICKUP authKW 721757 5% 49% 20
2 OPTICAL HEAD authKW 485908 4% 39% 17
3 DIGITAL VERSATILE DISC authKW 435181 2% 59% 10
4 PICKUP HEAD authKW 435181 2% 59% 10
5 OPTICAL PICKUP ACTUATOR authKW 394566 2% 67% 8
6 OPTICAL PICKUP HEAD authKW 372982 3% 46% 11
7 LENS ACTUATOR authKW 369911 1% 100% 5
8 VOICE COIL MOTOR VCM authKW 336272 2% 45% 10
9 INFORMAT STORAGE DEVICE address 327894 6% 18% 25
10 HOLOGRAPHIC OPTICAL ELEMENT HOE authKW 308258 1% 83% 5

Web of Science journal categories


chi_square_rank Category chi_square shrOfCwithTerm shrOfTermInClass termInClass
1 Physics, Applied 3788 60% 0% 255
2 Engineering, Electrical & Electronic 1949 40% 0% 172
3 Optics 580 16% 0% 70
4 Nanoscience & Nanotechnology 246 9% 0% 39
5 Engineering, Mechanical 195 8% 0% 33
6 Automation & Control Systems 162 4% 0% 19
7 Engineering, Manufacturing 60 2% 0% 10
8 Materials Science, Multidisciplinary 58 12% 0% 50
9 Telecommunications 49 4% 0% 15
10 Instruments & Instrumentation 49 4% 0% 18

Address terms


chi_square_rank term chi_square shrOfCwithTerm shrOfTermInClass termInClass
1 INFORMAT STORAGE DEVICE 327894 6% 18% 25
2 CISD 186480 3% 23% 11
3 OMNERC SHENZHEN BRANCH 147964 0% 100% 2
4 VIDEO MEDIA MULTIMEDIA BUSINESS 147964 0% 100% 2
5 ENVIRONM TEST 98642 0% 67% 2
6 MFG TECHNOL RD 95117 1% 43% 3
7 PRECIS TECHNOL DEV 92470 1% 25% 5
8 ADV CORE TECHNOL GRP 73982 0% 100% 1
9 ADV TRANSPORTAT VEHICLE 73982 0% 100% 1
10 AN DONG INFORMAT 73982 0% 100% 1

Journals


chi_square_rank term chi_square shrOfCwithTerm shrOfTermInClass termInClass
1 JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS 25813 24% 0% 104
2 MICROSYSTEM TECHNOLOGIES-MICRO-AND NANOSYSTEMS-INFORMATION STORAGE AND PROCESSING SYSTEMS 24254 8% 1% 35
3 IEEE TRANSACTIONS ON MAGNETICS 12532 18% 0% 76
4 MECHATRONICS 4585 3% 1% 11
5 JOURNAL OF INFORMATION STORAGE AND PROCESSING SYSTEMS 3284 0% 2% 2
6 IEEE TRANSACTIONS ON CONSUMER ELECTRONICS 2555 3% 0% 13
7 OPTICAL REVIEW 1700 2% 0% 7
8 JOURNAL OF MAGNETICS 1104 1% 1% 3
9 PHILIPS JOURNAL OF RESEARCH 882 0% 1% 2
10 JSME INTERNATIONAL JOURNAL SERIES III-VIBRATION CONTROL ENGINEERING ENGINEERING FOR INDUSTRY 874 0% 1% 2

Author Key Words


chi_square_rank term chi_square shrOfCwithTerm shrOfTermInClass termInClass LCSH search Wikipedia search
1 OPTICAL PICKUP 721757 5% 49% 20 Search OPTICAL+PICKUP Search OPTICAL+PICKUP
2 OPTICAL HEAD 485908 4% 39% 17 Search OPTICAL+HEAD Search OPTICAL+HEAD
3 DIGITAL VERSATILE DISC 435181 2% 59% 10 Search DIGITAL+VERSATILE+DISC Search DIGITAL+VERSATILE+DISC
4 PICKUP HEAD 435181 2% 59% 10 Search PICKUP+HEAD Search PICKUP+HEAD
5 OPTICAL PICKUP ACTUATOR 394566 2% 67% 8 Search OPTICAL+PICKUP+ACTUATOR Search OPTICAL+PICKUP+ACTUATOR
6 OPTICAL PICKUP HEAD 372982 3% 46% 11 Search OPTICAL+PICKUP+HEAD Search OPTICAL+PICKUP+HEAD
7 LENS ACTUATOR 369911 1% 100% 5 Search LENS+ACTUATOR Search LENS+ACTUATOR
8 VOICE COIL MOTOR VCM 336272 2% 45% 10 Search VOICE+COIL+MOTOR+VCM Search VOICE+COIL+MOTOR+VCM
9 HOLOGRAPHIC OPTICAL ELEMENT HOE 308258 1% 83% 5 Search HOLOGRAPHIC+OPTICAL+ELEMENT+HOE Search HOLOGRAPHIC+OPTICAL+ELEMENT+HOE
10 COMPATIBLE PICKUP 295929 1% 100% 4 Search COMPATIBLE+PICKUP Search COMPATIBLE+PICKUP

Core articles
The table includes core articles in the class. The following variables is taken into account for the relevance score of an article in a cluster c:
(1) Number of references referring to publications in the class.
(2) Share of total number of active references referring to publications in the class.
(3) Age of the article. New articles get higher score than old articles.
(4) Citation rate, normalized to year.

Classes with closest relation at Level 1


rank cluster_id2 link
1 25865 LAND GROOVE RECORDING//DVD PICKUP HEAD//DWDD
2 15091 SOLID IMMERSION LENS//NEAR FIELD RECORDING//INFORMAT STORAGE DEVICE
3 33815 OPTICAL TAPE//PARALLEL RECORDING//BIT SKEW COMPENSATION
4 25645 CAMLESS ENGINE//THOMSON COIL ACTUATOR//VARIABLE VALVE TIMING VVT
5 12636 HARD DISK DRIVE//DUAL STAGE ACTUATOR//HARD DISK DRIVES HDDS
6 25050 VIDEO STABILIZATION//DIGITAL IMAGE STABILIZATION//DIGITAL VIDEO STABILIZATION
7 36843 NII FOOLIOS//ALL RUSSIA STATE//INFRARED SCANNING SYSTEM
8 34426 CONCURRENT DAMPERS//CONCURRENT SPRINGS//DUFFING SPRING
9 26284 SPHERICAL ACTUATOR//SPHERICAL MOTOR//TORQUE MODEL
10 31198 WRITTEN POLE MOTOR//POST ASSEMBLY MAGNETIZATION//MAGNETIC ENCODER

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