human: Given a hyperedge-centered hypergraph: <hypergraph>, where the center hyperedge is induced by one source paper and its member nodes are the cited papers.

Details of the hypergraph:
Center hyperedge (induced by source paper "finger stylus for non touch enable systems"):
  Abstract: Since computer was invented, people are using many devices to interact with computer. Initially there were keyboard, mouse etc. but with the advancement of technology, new ways are being discovered that are quite usual and natural to the humans like stylus, touch-enable systems. In the current age of technology, user is expected to touch the machine interface to give input. Hand gesture is such a way to interact with machines where natural bare hand is used to communicate without touching machine interface. It gives a feeling to user that he is interacting in natural way to some human, not with traditional machines. This paper presents a technique where user needs not to touch the machine interface to draw on screen. Here hand finger draws shapes on monitor like stylus, without touching the monitor. This method can be used in many applications including games. The finger was used as an input device that acts like paint-brush or finger-stylus and is used to make shapes in front of the camera. Fingertip extraction and motion tracking were done in Matlab with real time constraints. This work is an early attempt to replace stylus with the natural finger without touching screen.

Includes members:
  Member "intelligent approaches to interact with machines using hand gesture recognition in natural way a survey":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "solargest ubiquitous and battery free gesture recognition using solar cells")
  Member "automated switching system for skin pixel segmentation in varied lighting":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "android based portable hand sign recognition system")
  Member "a health monitoring system for elder and sick persons":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "gui system for elders patients in intensive care")
  Member "fingertip detection a fast method with natural hand":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "fingers angle calculation using level set method")
  Member "an efficient real time method of fingertip detection":
    also connected through other hyperedges:
      (none)

Question: Please tell me which class the source paper 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.HC(Human-Computer Interaction)