human: Given a node-centered hypergraph: <hypergraph>, where nodes represent papers and hyperedges represent sets of papers co-cited by a source paper.

Details of the hypergraph:
Center node: "patents as instruments for exploring innovation dynamics geographic and technological perspectives on photovoltaic cells"
  Abstract: The dynamics of innovation are nonlinear and complex: geographical, technological, and economic selection environments can be expected to interact. Can patents provide an analytical lens to this process in terms of different attributes such as inventor addresses, classification codes, backward and forward citations, etc.? Two recently developed patent maps with interactive overlay techniques--Google Maps and maps based on citation relations among International Patent Classifications (IPC)--are elaborated into dynamic versions that allow for online animations and comparisons by using split screens. Various forms of animation are explored. The recently developed Cooperative Patent Classifications (CPC) of the U.S. Patent and Trade Office (USPTO) and the European Patent Office (EPO) provide new options for a precise delineation of samples in both USPTO data and the Worldwide Patent Statistics Database (PatStat) of EPO. Among the "technologies for the mitigation of climate change" (class Y02), we zoom in on nine material technologies for photovoltaic cells; and focus on one of them (CuInSe2) as a lead case. The longitudinal development of Rao-Stirling diversity in the IPC-based maps provides a heuristics for studying technological generations during the period under study (1975-2012). The sequencing of generations prevails in USPTO data more than in PatStat data because PatStat aggregates patent information from countries in different stages of technological development, whereas one can expect USPTO patents to be competitive at the technological edge.

Connected through hyperedge HE-1 (induced by source paper "data mining the foundational patents of photovoltaic materials an application of patent citation spectroscopy"):
  with members:
    - "strategic intelligence on emerging technologies scientometric overlay mapping"
    - "patent citation spectroscopy pcs algorithmic retrieval of landmark patents"
    - "citation algorithms for identifying research milestones driving biomedical innovation"
    - "introducing citedreferencesexplorer crexplorer a program for reference publication year spectroscopy with cited references standardization"
    - "detecting the historical roots of research fields by reference publication year spectroscopy rpys"
    - "publish or patent bibliometric evidence for empirical trade offs in national funding strategies"

Connected through hyperedge HE-2 (induced by source paper "mapping patent classifications portfolio and statistical analysis and the comparison of strengths and weaknesses"):
  with members:
    - "measuring technological distance for patent mapping"
    - "strategic intelligence on emerging technologies scientometric overlay mapping"
    - "generating clustered journal maps an automated system for hierarchical classification"
    - "patent portfolio analysis of cities statistics and maps of technological inventiveness"
    - "journal portfolio analysis for countries cities and organizations maps and comparisons"
    - "can technology life cycles be indicated by diversity in patent classifications the crucial role of variety"
    - "science visualization and discursive knowledge"
    - "a unified approach to mapping and clustering of bibliometric networks"

Connected through hyperedge HE-3 (induced by source paper "strategic intelligence on emerging technologies scientometric overlay mapping"):
  with members:
    - "what is an emerging technology"
    - "interactive overlays of journals and the measurement of interdisciplinarity on the basis of aggregated journal journal citations"
    - "bibliometric perspectives on medical innovation using the medical subject headings mesh of pubmed"
    - "a new methodology for constructing a publication level classification system of science"
    - "mapping uspto patent data using overlays to google maps"
    - "the detection of hot regions in the geography of science a visualization approach by using density maps"
    - "mapping the geography of science distribution patterns and networks of relations among cities and institutes"
    - "science overlay maps a new tool for research policy and library management"

Connected through hyperedge HE-4 (induced by source paper "a review of theory and practice in scientometrics"):
  with members:
    - "identifying research fields within business and management a journal cross citation analysis"
    - "the operationalization of fields as wos subject categories wcs in evaluative bibliometrics the cases of library and information science and science technology studies"
    - "do altmetrics point to the broader impact of research an overview of benefits and disadvantages of altmetrics"
    - "a systematic empirical comparison of different approaches for normalizing citation impact indicators"
    - "which percentile based approach should be preferred for calculating normalized citation impact values an empirical comparison of five approaches including a newly developed citation rank approach p100"
    - "the revised snip indicator of elsevier s scopus"
    - "interactive overlays of journals and the measurement of interdisciplinarity on the basis of aggregated journal journal citations"
    - "how to improve the prediction based on citation impact percentiles for years shortly after the publication date"

Connected through hyperedge HE-5 (induced by source paper "the globalization of academic entrepreneurship the recent growth 2009 2014 in university patenting decomposed"):
  with members:
    - "journal portfolio analysis for countries cities and organizations maps and comparisons"

Connected through hyperedge HE-6 (induced by source paper "scientometric mapping as a strategic intelligence tool for the governance of emerging technologies"):
  with members:
    - "interactive overlays of journals and the measurement of interdisciplinarity on the basis of aggregated journal journal citations"
    - "bibliometric perspectives on medical innovation using the medical subject headings mesh of pubmed"
    - "the detection of"
    - "mapping uspto patent data using overlays to google maps"
    - "the detection of hot regions in the geography of science a visualization approach by using density maps"
    - "mapping the geography of science distribution patterns and networks of relations among cities and institutes"
    - "science overlay maps a new tool for research policy and library management"

Connected through hyperedge HE-7 (induced by source paper "can technology life cycles be indicated by diversity in patent classifications the crucial role of variety"):
  with members:
    - "knowledge generating efficiency in innovation systems the relation between structural and temporal effects"
    - "interactive overlays of journals and the measurement of interdisciplinarity on the basis of aggregated journal journal citations"
    - "interactive overlay maps for us patent uspto data based on international patent classifications ipc"
    - "how journal rankings can suppress interdisciplinary research a comparison between innovation studies and business management"

Question: Please tell me which class the center node belongs to. The 40 classes are: cs.NA(Numerical Analysis), cs.MM(Multimedia), cs.LO(Logic in Computer Science), cs.CY(Computers and Society), cs.CR(Cryptography and Security), cs.DC(Distributed, Parallel, and Cluster Computing), cs.HC(Human-Computer Interaction), cs.CE(Computational Engineering, Finance, and Science), cs.NI(Networking and Internet Architecture), cs.CC(Computational Complexity), cs.AI(Artificial Intelligence), cs.MA(Multiagent Systems), cs.GL(General Literature), cs.NE(Neural and Evolutionary Computing), cs.SC(Symbolic Computation), cs.AR(Hardware Architecture), cs.CV(Computer Vision and Pattern Recognition), cs.GR(Graphics), cs.ET(Emerging Technologies), cs.SY(Systems and Control), cs.CG(Computational Geometry), cs.OH(Other Computer Science), cs.PL(Programming Languages), cs.SE(Software Engineering), cs.LG(Machine Learning), cs.SD(Sound), cs.SI(Social and Information Networks), cs.RO(Robotics), cs.IT(Information Theory), cs.PF(Performance), cs.CL(Computation and Language), cs.IR(Information Retrieval), cs.MS(Mathematical Software), cs.FL(Formal Languages and Automata Theory), cs.DS(Data Structures and Algorithms), cs.OS(Operating Systems), cs.GT(Computer Science and Game Theory), cs.DB(Databases), cs.DL(Digital Libraries), cs.DM(Discrete Mathematics). Directly output the class name.

gpt: cs.CY(Computers and Society)