Subspace Projection-Based Collision Detection for Physical Interaction Tasks of Collaborative Robots
In recent years, various collision detection methods have been proposed for safe human–robot collaboration; these methods are usually model-based. However, most tasks conducted by collaborative robots involve a physical robot–environment interaction, and it is very difficult to design a model of suc...
        Saved in:
      
    
          | Published in | International journal of precision engineering and manufacturing Vol. 20; no. 7; pp. 1119 - 1126 | 
|---|---|
| Main Authors | , , | 
| Format | Journal Article | 
| Language | English | 
| Published | 
        Seoul
          Korean Society for Precision Engineering
    
        01.07.2019
     Springer Nature B.V  | 
| Subjects | |
| Online Access | Get full text | 
| ISSN | 2234-7593 2005-4602  | 
| DOI | 10.1007/s12541-019-00130-z | 
Cover
| Abstract | In recent years, various collision detection methods have been proposed for safe human–robot collaboration; these methods are usually model-based. However, most tasks conducted by collaborative robots involve a physical robot–environment interaction, and it is very difficult to design a model of such interaction that varies depending on the external environment. Therefore, this study proposes a method for detecting collision between a human and a robot while the robot executes a task involving physical interaction with an unknown environment. To this end, a collision detection index is suggested based on the subspace projection technique. The proposed collision detection scheme is verified experimentally using a 7-DOF robot arm, and the experimental results show that collisions can be detected reliably by the proposed method. | 
    
|---|---|
| AbstractList | In recent years, various collision detection methods have been proposed for safe human–robot collaboration; these methods are usually model-based. However, most tasks conducted by collaborative robots involve a physical robot–environment interaction, and it is very difficult to design a model of such interaction that varies depending on the external environment. Therefore, this study proposes a method for detecting collision between a human and a robot while the robot executes a task involving physical interaction with an unknown environment. To this end, a collision detection index is suggested based on the subspace projection technique. The proposed collision detection scheme is verified experimentally using a 7-DOF robot arm, and the experimental results show that collisions can be detected reliably by the proposed method. | 
    
| Author | Song, Jae-Bok Lee, Sang-Duck Ahn, Kuk-Hyun  | 
    
| Author_xml | – sequence: 1 givenname: Sang-Duck surname: Lee fullname: Lee, Sang-Duck organization: Logistics System Research Division, Korea Railroad Research Institute – sequence: 2 givenname: Kuk-Hyun surname: Ahn fullname: Ahn, Kuk-Hyun organization: School of Mechanical Engineering, Korea University – sequence: 3 givenname: Jae-Bok orcidid: 0000-0002-5818-1938 surname: Song fullname: Song, Jae-Bok email: jbsong@korea.ac.kr organization: School of Mechanical Engineering, Korea University  | 
    
| BookMark | eNp9kE1LAzEQhoNUsNb-AU8Bz9F8bLK7R61fhYJF6zkk2US3rpuapEL76912BcFDTzPDzDPvzHsKBq1vLQDnBF8SjPOrSCjPCMKkRBgThtH2CAwpxhxlAtNBl1OWoZyX7ASMY6w1ZoQKxgsxBNXLWseVMhbOg19ak2rfohsVbQUnvmnq2NXw1qa-A50PcP6-ibVRDZy2yQbVNxYqfkTo3Z5S2geV6m8Ln732KZ6BY6eaaMe_cQRe7-8Wk0c0e3qYTq5nyLCSJiSMEk5XlTJ5WVCLS5EbYUqu86zA1ApCmOOkypzRLmNFWeVa50VlKkOJKyhnI3DR710F_7W2McmlX4e2k5SUcixowcusm6L9lAk-xmCdXIX6U4WNJFjuDJW9obIzVO4NldsOKv5Bpk5q93oKqm4Oo6xHY6fTvtnwd9UB6gcYQ46J | 
    
| CitedBy_id | crossref_primary_10_1016_j_mechatronics_2022_102895 crossref_primary_10_1007_s40684_020_00214_6 crossref_primary_10_1109_ACCESS_2021_3099287 crossref_primary_10_1108_IR_08_2019_0163 crossref_primary_10_1177_16878140211035996 crossref_primary_10_1007_s12541_020_00370_4 crossref_primary_10_1007_s12541_021_00537_7 crossref_primary_10_1016_j_mechatronics_2021_102603  | 
    
| Cites_doi | 10.1109/TIE.2012.2189534 10.1109/LRA.2017.2789249 10.1109/3516.653047 10.1007/s12541-017-0201-6 10.1080/01691864.2012.685259 10.1007/s12541-016-0002-3 10.1109/TRO.2017.2723903 10.1002/rob.1029 10.1017/S0263574703005204 10.1109/IRDS.2002.1044021 10.1109/ROBOT.1997.606724 10.1109/IECON.1989.69669 10.1109/AIM.2013.6584178 10.1109/ICRA.2015.7139726 10.1109/CoASE.2012.6386389 10.1109/ROBOT.2010.5509295 10.1109/IROS.2008.4650764 10.1109/ROBOT.1999.774098  | 
    
| ContentType | Journal Article | 
    
| Copyright | Korean Society for Precision Engineering 2019 Copyright Springer Nature B.V. 2019  | 
    
| Copyright_xml | – notice: Korean Society for Precision Engineering 2019 – notice: Copyright Springer Nature B.V. 2019  | 
    
| DBID | AAYXX CITATION  | 
    
| DOI | 10.1007/s12541-019-00130-z | 
    
| DatabaseName | CrossRef | 
    
| DatabaseTitle | CrossRef | 
    
| DatabaseTitleList | |
| DeliveryMethod | fulltext_linktorsrc | 
    
| Discipline | Engineering | 
    
| EISSN | 2005-4602 | 
    
| EndPage | 1126 | 
    
| ExternalDocumentID | 10_1007_s12541_019_00130_z | 
    
| GroupedDBID | -EM .UV 06D 0R~ 203 29J 29~ 2JY 2KG 30V 4.4 406 408 5GY 5VS 67Z 8TC 9ZL AACDK AAHNG AAIAL AAJBT AAJKR AANZL AARTL AASML AATNV AATVU AAUYE AAWCG AAYIU AAYQN AAYTO AAYZH AAZMS ABAKF ABDZT ABECU ABFTV ABHLI ABJNI ABJOX ABKCH ABMQK ABQBU ABSXP ABTEG ABTHY ABTKH ABTMW ABXPI ACAOD ACDTI ACGFO ACGFS ACHSB ACIWK ACKNC ACMDZ ACMLO ACOKC ACPIV ACREN ACZOJ ADHHG ADHIR ADINQ ADKNI ADKPE ADRFC ADTPH ADURQ ADYFF ADYOE ADZKW AEFQL AEGNC AEJHL AEJRE AEMSY AENEX AEOHA AEPYU AESKC AETCA AEVLU AEXYK AFBBN AFQWF AFWTZ AFYQB AFZKB AGAYW AGDGC AGMZJ AGQEE AGQMX AGRTI AGWZB AGYKE AHAVH AHBYD AHKAY AHYZX AIAKS AIGIU AIIXL AILAN AITGF AJRNO AJZVZ ALFXC ALMA_UNASSIGNED_HOLDINGS AMKLP AMTXH AMXSW AMYLF AMYQR ANMIH AOCGG ASPBG AVWKF AXYYD AYJHY AZFZN BA0 BGNMA CSCUP DDRTE DNIVK DPUIP DU5 EBLON EBS EIOEI EJD ESBYG FERAY FFXSO FIGPU FINBP FNLPD FRRFC FSGXE FYJPI GGCAI GGRSB GJIRD GQ6 GQ7 HG6 HLICF HMJXF HRMNR HZ~ I0C IKXTQ IWAJR IXC IXD J-C J0Z JBSCW JZLTJ KOV LLZTM M4Y MA- NPVJJ NQJWS NU0 O9J P2P P9P PT4 R9I RLLFE ROL RSV S27 S3B SDH SEG SHX SISQX SJYHP SNE SNPRN SNX SOHCF SOJ SPISZ SRMVM SSLCW STPWE T13 TDB TSG U2A UG4 UOJIU UTJUX UZXMN VC2 VFIZW W48 WK8 Z45 Z7R Z7V Z7W Z7X Z7Y Z7Z Z83 Z85 Z88 ZMTXR ~A9 0VY 2VQ 96X AAPKM AARHV AAYXX ABBRH ABDBE ABFSG ABRTQ ACBXY ACSTC AEBTG AEKMD AEZWR AFDZB AFGCZ AFHIU AFLOW AFOHR AGJBK AHPBZ AHSBF AHWEU AIXLP AJBLW ATHPR AYFIA CAG CITATION COF DBRKI FEDTE GW5 H13 HF~ HVGLF I~X O9- S1Z  | 
    
| ID | FETCH-LOGICAL-c392t-6ca6fbddac7982e0967c6c95b74802e6113f51d4fcbf4389d7bb78dcdc21f8253 | 
    
| IEDL.DBID | U2A | 
    
| ISSN | 2234-7593 | 
    
| IngestDate | Wed Sep 17 23:56:07 EDT 2025 Thu Apr 24 22:52:09 EDT 2025 Wed Oct 01 02:05:37 EDT 2025 Fri Feb 21 02:35:05 EST 2025  | 
    
| IsPeerReviewed | true | 
    
| IsScholarly | true | 
    
| Issue | 7 | 
    
| Keywords | Collision safety Physical interaction tasks Human–robot collaboration Collaborative robots  | 
    
| Language | English | 
    
| LinkModel | DirectLink | 
    
| MergedId | FETCHMERGED-LOGICAL-c392t-6ca6fbddac7982e0967c6c95b74802e6113f51d4fcbf4389d7bb78dcdc21f8253 | 
    
| Notes | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14  | 
    
| ORCID | 0000-0002-5818-1938 | 
    
| PQID | 2250628594 | 
    
| PQPubID | 2043903 | 
    
| PageCount | 8 | 
    
| ParticipantIDs | proquest_journals_2250628594 crossref_primary_10_1007_s12541_019_00130_z crossref_citationtrail_10_1007_s12541_019_00130_z springer_journals_10_1007_s12541_019_00130_z  | 
    
| ProviderPackageCode | CITATION AAYXX  | 
    
| PublicationCentury | 2000 | 
    
| PublicationDate | 2019-07-01 | 
    
| PublicationDateYYYYMMDD | 2019-07-01 | 
    
| PublicationDate_xml | – month: 07 year: 2019 text: 2019-07-01 day: 01  | 
    
| PublicationDecade | 2010 | 
    
| PublicationPlace | Seoul | 
    
| PublicationPlace_xml | – name: Seoul – name: Heidelberg  | 
    
| PublicationTitle | International journal of precision engineering and manufacturing | 
    
| PublicationTitleAbbrev | Int. J. Precis. Eng. Manuf | 
    
| PublicationYear | 2019 | 
    
| Publisher | Korean Society for Precision Engineering Springer Nature B.V  | 
    
| Publisher_xml | – name: Korean Society for Precision Engineering – name: Springer Nature B.V  | 
    
| References | Yamada, Hirasawa, Huang, Umetani, Suita (CR3) 1997; 2 CR2 Lee, Song (CR8) 2016; 17 CR4 CR6 CR19 CR7 Kouris, Dimeas, Aspragathos (CR17) 2018; 3 CR18 Haddadin, De Luca, Albu-Schäffer (CR1) 2017; 33 CR9 CR15 CR14 CR13 Terra, Tinos (CR11) 2001; 18 CR20 Safa, Ebrahimi, Zarchi, Abshari (CR5) 2017; 18 Cho, Kim, Kim, Song, Kyung (CR16) 2012; 26 Capisani, Ferrara, Loza, Fridman (CR10) 2012; 59 Vemuri, Polycarpou (CR12) 2004; 22 CN Cho (130_CR16) 2012; 26 Y Yamada (130_CR3) 1997; 2 HH Safa (130_CR5) 2017; 18 A Kouris (130_CR17) 2018; 3 130_CR20 LM Capisani (130_CR10) 2012; 59 130_CR9 SD Lee (130_CR8) 2016; 17 130_CR19 MH Terra (130_CR11) 2001; 18 130_CR13 AT Vemuri (130_CR12) 2004; 22 130_CR14 S Haddadin (130_CR1) 2017; 33 130_CR2 130_CR4 130_CR18 130_CR7 130_CR15 130_CR6  | 
    
| References_xml | – ident: CR19 – ident: CR18 – volume: 59 start-page: 3979 issue: 10 year: 2012 end-page: 3986 ident: CR10 article-title: Manipulator fault diagnosis via higher order sliding mode observers publication-title: IEEE Transactions on Industrial Electronics doi: 10.1109/TIE.2012.2189534 – volume: 3 start-page: 720 issue: 2 year: 2018 end-page: 727 ident: CR17 article-title: A frequency domain approach for contact type distinction in human–robot collaboration publication-title: IEEE Robotics and Automation Letters doi: 10.1109/LRA.2017.2789249 – ident: CR4 – ident: CR14 – ident: CR15 – ident: CR2 – volume: 2 start-page: 230 issue: 4 year: 1997 end-page: 236 ident: CR3 article-title: Human–robot contact in the safeguarding space publication-title: IEEE/ASME Transactions on Mechatronics doi: 10.1109/3516.653047 – volume: 18 start-page: 1731 issue: 12 year: 2017 end-page: 1737 ident: CR5 article-title: Eccentricity fault detection in permanent magnet synchronous generators using stator voltage signature analysis publication-title: International Journal of Precision Engineering and Manufacturing doi: 10.1007/s12541-017-0201-6 – ident: CR13 – ident: CR9 – ident: CR6 – volume: 26 start-page: 1825 issue: 16 year: 2012 end-page: 1840 ident: CR16 article-title: Collision detection algorithm to distinguish between intended contact and unexpected collision publication-title: Advanced Robotics doi: 10.1080/01691864.2012.685259 – ident: CR7 – volume: 17 start-page: 11 issue: 1 year: 2016 end-page: 17 ident: CR8 article-title: Sensorless collision detection based on friction model for a robot manipulator publication-title: International Journal of Precision Engineering and Manufacturing doi: 10.1007/s12541-016-0002-3 – volume: 33 start-page: 1292 issue: 6 year: 2017 end-page: 1312 ident: CR1 article-title: Robot collisions: a survey on detection, isolation, and identification publication-title: IEEE Transactions on Robotics doi: 10.1109/TRO.2017.2723903 – volume: 18 start-page: 357 issue: 7 year: 2001 end-page: 374 ident: CR11 article-title: Fault detection and isolation in robotic manipulators via neural networks: A comparison among three architectures for residual analysis publication-title: Journal of Robotic Systems doi: 10.1002/rob.1029 – ident: CR20 – volume: 22 start-page: 419 issue: 4 year: 2004 end-page: 438 ident: CR12 article-title: A methodology for fault diagnosis in robotic systems using neural networks publication-title: Robotica doi: 10.1017/S0263574703005204 – volume: 17 start-page: 11 issue: 1 year: 2016 ident: 130_CR8 publication-title: International Journal of Precision Engineering and Manufacturing doi: 10.1007/s12541-016-0002-3 – ident: 130_CR14 doi: 10.1109/IRDS.2002.1044021 – ident: 130_CR4 doi: 10.1109/ROBOT.1997.606724 – ident: 130_CR2 doi: 10.1109/IECON.1989.69669 – volume: 2 start-page: 230 issue: 4 year: 1997 ident: 130_CR3 publication-title: IEEE/ASME Transactions on Mechatronics doi: 10.1109/3516.653047 – ident: 130_CR6 – volume: 26 start-page: 1825 issue: 16 year: 2012 ident: 130_CR16 publication-title: Advanced Robotics doi: 10.1080/01691864.2012.685259 – ident: 130_CR9 doi: 10.1109/AIM.2013.6584178 – ident: 130_CR20 – ident: 130_CR18 doi: 10.1109/ICRA.2015.7139726 – ident: 130_CR15 doi: 10.1109/CoASE.2012.6386389 – volume: 3 start-page: 720 issue: 2 year: 2018 ident: 130_CR17 publication-title: IEEE Robotics and Automation Letters doi: 10.1109/LRA.2017.2789249 – volume: 59 start-page: 3979 issue: 10 year: 2012 ident: 130_CR10 publication-title: IEEE Transactions on Industrial Electronics doi: 10.1109/TIE.2012.2189534 – ident: 130_CR13 doi: 10.1109/ROBOT.2010.5509295 – volume: 22 start-page: 419 issue: 4 year: 2004 ident: 130_CR12 publication-title: Robotica doi: 10.1017/S0263574703005204 – volume: 33 start-page: 1292 issue: 6 year: 2017 ident: 130_CR1 publication-title: IEEE Transactions on Robotics doi: 10.1109/TRO.2017.2723903 – ident: 130_CR7 doi: 10.1109/IROS.2008.4650764 – volume: 18 start-page: 357 issue: 7 year: 2001 ident: 130_CR11 publication-title: Journal of Robotic Systems doi: 10.1002/rob.1029 – ident: 130_CR19 doi: 10.1109/ROBOT.1999.774098 – volume: 18 start-page: 1731 issue: 12 year: 2017 ident: 130_CR5 publication-title: International Journal of Precision Engineering and Manufacturing doi: 10.1007/s12541-017-0201-6  | 
    
| SSID | ssib031263586 ssib036278122 ssib053376809 ssj0068040  | 
    
| Score | 2.221188 | 
    
| Snippet | In recent years, various collision detection methods have been proposed for safe human–robot collaboration; these methods are usually model-based. However,... | 
    
| SourceID | proquest crossref springer  | 
    
| SourceType | Aggregation Database Enrichment Source Index Database Publisher  | 
    
| StartPage | 1119 | 
    
| SubjectTerms | Collaboration Engineering Industrial and Production Engineering Materials Science Regular Paper Robot arms Robots Unknown environments  | 
    
| Title | Subspace Projection-Based Collision Detection for Physical Interaction Tasks of Collaborative Robots | 
    
| URI | https://link.springer.com/article/10.1007/s12541-019-00130-z https://www.proquest.com/docview/2250628594  | 
    
| Volume | 20 | 
    
| hasFullText | 1 | 
    
| inHoldings | 1 | 
    
| isFullTextHit | |
| isPrint | |
| journalDatabaseRights | – providerCode: PRVLSH databaseName: SpringerLink Journals customDbUrl: mediaType: online eissn: 2005-4602 dateEnd: 99991231 omitProxy: false ssIdentifier: ssj0068040 issn: 2234-7593 databaseCode: AFBBN dateStart: 20090101 isFulltext: true providerName: Library Specific Holdings – providerCode: PRVAVX databaseName: SpringerLINK - Czech Republic Consortium customDbUrl: eissn: 2005-4602 dateEnd: 99991231 omitProxy: false ssIdentifier: ssj0068040 issn: 2234-7593 databaseCode: AGYKE dateStart: 20090101 isFulltext: true titleUrlDefault: http://link.springer.com providerName: Springer Nature – providerCode: PRVAVX databaseName: SpringerLink Journals (ICM) customDbUrl: eissn: 2005-4602 dateEnd: 99991231 omitProxy: true ssIdentifier: ssj0068040 issn: 2234-7593 databaseCode: U2A dateStart: 20090101 isFulltext: true titleUrlDefault: http://www.springerlink.com/journals/ providerName: Springer Nature  | 
    
| link | http://utb.summon.serialssolutions.com/2.0.0/link/0/eLvHCXMwlV1LS8NAEF60vehBfGK1lj1404VuXps9ttpaFEuRFuopZF8XpRUTPfTXO7tJGhUVPCWwj8DMZJ473yJ0zlWsUy4YMcILSMAlI1wrRqLYUN2VXFJXwb8fR6NZcDsP52VTWFaddq9Kkk5T181uEMvY0JcTV24jq03UDC2cF0jxzOtVUuRTi69Sg6KBhmZgxdZGHPwbcLEtaFWhr-HdtU2CnQwIC7lfttb8_M2v5qv2Sb-VUZ11Gu6indKtxL1CDvbQhl7so-1PYIMHSFkdARGyxpMi-wIcIX0wYgrb7IHrMcfXOi9GMDizeFIyEbu8YdECgadp9pThpXGrShF61_hhKZZ5dohmw8H0akTKOxaIBM8oJ5FMIyOUSiXjsachoGEykjwULIi7no4o9U1IVWCkMPaidMWEYLGSSnrUQHTpH6HGYrnQxwjHwqRaG8O4gxE0XBsqhQx8D3buMq-FaEW6RJYA5PYejOekhk625E6A3Ikjd7JqoYv1mpcCfuPP2e2KI0n5K2YJKCzXJ8qDFrqsuFQP_77byf-mn6ItzwmKPcrbRo389U2fgcOSiw5q9ob9_tg-bx7vBh0nrx_J_OEq | 
    
| linkProvider | Springer Nature | 
    
| linkToHtml | http://utb.summon.serialssolutions.com/2.0.0/link/0/eLvHCXMwlV07T8MwELagDMCAeIpCAQ9sYKnOy_FYHlWBtqpQK3WL4tcCahEJDP31nJ2kAQRIbJEcO9Ld5R4-f58ROucq1ikXjBjhBSTgkhGuFSNRbKhuSy6p6-APhlFvEtxPw2kJCsuq0-5VS9J56hrsBrWMLX05ce02slhFa5bAyjLmT7xOZUU-tfwqNSkaeGgGUWwZxCG_gRTbklYV_hqeHWwS4mRAWMj9Elrz8ze_hq86J_3WRnXRqbuNtsq0EncKO9hBK3q2izY_kQ3uIWV9BFTIGo-K3RfQCLmCIKaw3T1wGHN8o_NiBEMyi0elErHbNywgEHicZk8Znhs3qzShd40f52KeZ_to0r0dX_dIeccCkZAZ5SSSaWSEUqlkPPY0FDRMRpKHggVx29MRpb4JqQqMFMZelK6YECxWUkmPGqgu_QPUmM1n-hDhWJhUa2MYdzSChmtDpZCB78HKbeY1Ea1El8iSgNzeg_Gc1NTJVtwJiDtx4k4WTXSxnPNS0G_8-Xar0khS_opZAg7L4UR50ESXlZbq4d9XO_rf62dovTce9JP-3fDhGG14zmjssd4WauSvb_oEkpdcnDpb_QBeTuEG | 
    
| linkToPdf | http://utb.summon.serialssolutions.com/2.0.0/link/0/eLvHCXMwlV1JS8QwFA4uIHoQVxzXHLxpcNJmmuboNrgziANzK812UdrBVg_z631J26mKCt4KaVJ47_Utefm-IHQodGxSITmxMmCECcWJMJqTKLbUdJVQ1Hfw7x-iqyG7GfVGn1D8_rR705KsMA2OpSkrT8banrTAN6hrXBksiG-9kcksmmeOKAEsehicNhYVUse10hKkgbfmENGmAR1yHUi3HYFV5bvh2UMoIWYywnsirGE2P3_zayhr89NvLVUfqforaLlOMfFpZROraMZka2jpE_HgOtLOX0C1bPCg2okB7ZAzCGgau50EjzfHF6asRjAktnhQKxT7PcQKDoGf0uK5wLn1s2pzejf4MZd5WWygYf_y6fyK1PctEAVZUkkilUZWap0qLuLAQHHDVaRET3IWdwMTURraHtXMKmndpemaS8ljrbQKqIVKM9xEc1memS2EY2lTY6zlwlMKWmEsVVKxMICVuzzoINqILlE1Gbm7E-MlaWmUnbgTEHfixZ1MOuhoOmdcUXH8-fZuo5Gk_i2LBJyXx4wK1kHHjZba4d9X2_7f6wdoYXDRT-6uH2530GLgbcad8N1Fc-Xrm9mDPKaU-95UPwCjvuVC | 
    
| openUrl | ctx_ver=Z39.88-2004&ctx_enc=info%3Aofi%2Fenc%3AUTF-8&rfr_id=info%3Asid%2Fsummon.serialssolutions.com&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.atitle=Subspace+Projection-Based+Collision+Detection+for+Physical+Interaction+Tasks+of+Collaborative+Robots&rft.jtitle=International+journal+of+precision+engineering+and+manufacturing&rft.au=Lee%2C+Sang-Duck&rft.au=Ahn%2C+Kuk-Hyun&rft.au=Song%2C+Jae-Bok&rft.date=2019-07-01&rft.pub=Korean+Society+for+Precision+Engineering&rft.issn=2234-7593&rft.eissn=2005-4602&rft.volume=20&rft.issue=7&rft.spage=1119&rft.epage=1126&rft_id=info:doi/10.1007%2Fs12541-019-00130-z&rft.externalDocID=10_1007_s12541_019_00130_z | 
    
| thumbnail_l | http://covers-cdn.summon.serialssolutions.com/index.aspx?isbn=/lc.gif&issn=2234-7593&client=summon | 
    
| thumbnail_m | http://covers-cdn.summon.serialssolutions.com/index.aspx?isbn=/mc.gif&issn=2234-7593&client=summon | 
    
| thumbnail_s | http://covers-cdn.summon.serialssolutions.com/index.aspx?isbn=/sc.gif&issn=2234-7593&client=summon |