Focus and Shoot:Efficient Identification Over RFID Tags 357 Acknowledgement.This work is partially supported by the National Natural Science Foundation of China under Grant No.61100196,61073028,61021062;the JiangSu Nat- ural Science Foundation under Grant No.BK2011559;and NSF grants ECCS 1231461, ECCS1128209,CNS1138963,CNS1065444,and CCF1028167. References 1.Vogt,H.:Efficient object identification with passive RFID tags.In:Mattern, F.,Naghshineh,M.(eds.)PERVASIVE 2002.LNCS,vol.2414,p.98.Springer, Heidelberg (2002) 2.Maguire,Y.,Pappu,R.:An optimal q-algorithm for the ISO 18000-6C RFID pro- tocol.IEEE Trans.Autom.Sci.Eng.6(1),16-24(2009) 3.Zhen,B.,Kobayashi,M.,Shimuzu,M.:Framed aloha for multiple RFID objects identification.IEICE Trans.Commun.E80-B(3),991-999(2005) 4.Lee,S.,Joo,S.,Lee,C.:An enhanced dynamic framed slotted ALOHA algorithm for RFID tag identification.In:Proceedings of MobiQuitous,pp.166-172.IEEE (2005) 5.Tan,C.C.,Sheng,B.,Li,Q.:How to monitor for missing RFID tags.In:IEEE ICDCS,pp.295-302.IEEE(2008) 6.Li,T.,Chen,S.,Ling,Y.:Identifying the missing tags in a large RFID system.In: ACM MobiHoc,pp.1-10.ACM(2010) 7.Zheng,Y.,Li,M.:Fast tag searching protocol for large-scale RFID systems.In: IEEE ICNP,pp.363-372.IEEE (2011) 8.Kodialam,M.,Nandagopal,T.:Fast and reliable estimation schemes in RFID systems.In:ACM MobiCom,pp.322-333.ACM(2006) 9.Qian,C.,Ngan,H.,Liu,Y.,Ni,L.M.:Cardinality estimation for large-scale RFID systems.IEEE Trans.Parallel Distrib.Syst.22(9),1441-1454(2011) 10.Zheng,Y.,Li,M.,Qian,C.:PET:probabilistic estimating tree for large-scale RFID estimation.In:IEEE ICDCS,pp.37-46.IEEE(2011) 11.Buettner,M.,Wetherall,D.:An emprical study of UHF RFID performance.In: Proceedings of MobiCom,pp.223-234.ACM(2008) 12.Arror,S.R.,Deavours,D.D.:Evaluation of the state of passive UHF RFID:an experimental approach.IEEE Syst.J.1(2),168-176 (2007) 13.Jeffery,S.R.,Garofalakis,M.,Franklin,M.J.:Adaptive cleaning for RFID data streams.In:Proceedings of VLDB,pp.163-174.ACM(2006) 14.Xu,X.,Gu,L.,Wang,J.,Xing,G.:Negotiate power and performance in the reality of RFID systems.In:IEEE PerCom,pp.88-97.IEEE (2010)Focus and Shoot: Efficient Identification Over RFID Tags 357 Acknowledgement. This work is partially supported by the National Natural Science Foundation of China under Grant No. 61100196, 61073028, 61021062; the JiangSu Nat￾ural Science Foundation under Grant No. BK2011559; and NSF grants ECCS 1231461, ECCS 1128209, CNS 1138963, CNS 1065444, and CCF 1028167. References 1. Vogt, H.: Efficient object identification with passive RFID tags. In: Mattern, F., Naghshineh, M. (eds.) PERVASIVE 2002. LNCS, vol. 2414, p. 98. Springer, Heidelberg (2002) 2. Maguire, Y., Pappu, R.: An optimal q-algorithm for the ISO 18000-6C RFID pro￾tocol. IEEE Trans. Autom. Sci. Eng. 6(1), 16–24 (2009) 3. Zhen, B., Kobayashi, M., Shimuzu, M.: Framed aloha for multiple RFID objects identification. IEICE Trans. Commun. E80–B(3), 991–999 (2005) 4. Lee, S., Joo, S., Lee, C.: An enhanced dynamic framed slotted ALOHA algorithm for RFID tag identification. In: Proceedings of MobiQuitous, pp. 166–172. IEEE (2005) 5. Tan, C.C., Sheng, B., Li, Q.: How to monitor for missing RFID tags. In: IEEE ICDCS, pp. 295–302. IEEE (2008) 6. Li, T., Chen, S., Ling, Y.: Identifying the missing tags in a large RFID system. In: ACM MobiHoc, pp. 1–10. ACM (2010) 7. Zheng, Y., Li, M.: Fast tag searching protocol for large-scale RFID systems. In: IEEE ICNP, pp. 363–372. IEEE (2011) 8. Kodialam, M., Nandagopal, T.: Fast and reliable estimation schemes in RFID systems. In: ACM MobiCom, pp. 322–333. ACM (2006) 9. Qian, C., Ngan, H., Liu, Y., Ni, L.M.: Cardinality estimation for large-scale RFID systems. IEEE Trans. Parallel Distrib. Syst. 22(9), 1441–1454 (2011) 10. Zheng, Y., Li, M., Qian, C.: PET: probabilistic estimating tree for large-scale RFID estimation. In: IEEE ICDCS, pp. 37–46. IEEE (2011) 11. Buettner, M., Wetherall, D.: An emprical study of UHF RFID performance. In: Proceedings of MobiCom, pp. 223–234. ACM (2008) 12. Arror, S.R., Deavours, D.D.: Evaluation of the state of passive UHF RFID: an experimental approach. IEEE Syst. J. 1(2), 168–176 (2007) 13. Jeffery, S.R., Garofalakis, M., Franklin, M.J.: Adaptive cleaning for RFID data streams. In: Proceedings of VLDB, pp. 163–174. ACM (2006) 14. Xu, X., Gu, L., Wang, J., Xing, G.: Negotiate power and performance in the reality of RFID systems. In: IEEE PerCom, pp. 88–97. IEEE (2010)