CINXE.COM
Just a moment...
<!DOCTYPE html><html lang="en-US"><head><title>Just a moment...</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=Edge"><meta name="robots" content="noindex,nofollow"><meta name="viewport" content="width=device-width,initial-scale=1"><style>*{box-sizing:border-box;margin:0;padding:0}html{line-height:1.15;-webkit-text-size-adjust:100%;color:#313131;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans,sans-serif,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol,Noto Color Emoji}body{display:flex;flex-direction:column;height:100vh;min-height:100vh}.main-content{margin:8rem auto;max-width:60rem;padding-left:1.5rem}@media (width <= 720px){.main-content{margin-top:4rem}}.h2{font-size:1.5rem;font-weight:500;line-height:2.25rem}@media (width <= 720px){.h2{font-size:1.25rem;line-height:1.5rem}}#challenge-error-text{background-image:url(data:image/svg+xml;base64,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);background-repeat:no-repeat;background-size:contain;padding-left:34px}@media (prefers-color-scheme:dark){body{background-color:#222;color:#d9d9d9}}</style><meta http-equiv="refresh" content="120"></head><body class="no-js"><div class="main-wrapper" role="main"><div class="main-content"><noscript><div class="h2"><span id="challenge-error-text">Enable JavaScript and cookies to continue</span></div></noscript></div></div><script>(function(){window._cf_chl_opt={cvId: '3',cZone: "publications.waset.org",cType: 'non-interactive',cRay: '9134ef0cbb1fa3d0',cH: 'XalJkvj.nUR68ZmoHqS0ETIFe6JXMbxh1uBO_izYsxs-1739786462-1.2.1.1-OO5oihrBg6XedWQBK4RxoN9DIlsEMTnFlG5TFIEvNIamdBmzTerlRH7vgHq2HThy',cUPMDTk: "\/search?q=Rui%20Cheng&__cf_chl_tk=ZLT0zhpoGPHVT0wPhJu9HA_1sA9BLiF3Q6OC_pKMpBQ-1739786462-1.0.1.1-Dba9caridMCNeFeH1z6sSAmDML2iLqhgGYCS.szQwp8",cFPWv: 'b',cITimeS: '1739786462',cTTimeMs: '1000',cMTimeMs: '120000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/search?q=Rui%20Cheng&__cf_chl_f_tk=ZLT0zhpoGPHVT0wPhJu9HA_1sA9BLiF3Q6OC_pKMpBQ-1739786462-1.0.1.1-Dba9caridMCNeFeH1z6sSAmDML2iLqhgGYCS.szQwp8",md: "Yl9k43XSVQndsL3a8TBTSeS2jvmez5cFgnJsZdFX3rU-1739786462-1.2.1.1-leWHT2AvJnOHLOOnHXGiuz_dqp3I7MRt2X7XhwfhC8fr0pZCVc8alYPJYN3NzTJdvbi_nVIdaSudtdr7QdTp7UAkuW.JjvEHLuYoDOWHbNF8OKJ7YbjpWPR9xaAtHrzEFMJ91tBNJC4WmyCJsnMkhQq3PpwBzqQtBt_HH02G2f6qlAOHCSDFELJ5iRxqnaxwA3MXIVlHCu82AjXDBPCkJUNrcFN3v6jGbwYNf1AzalPoo4FqciC4k9weoDm4PGXVhflPUXNkK6WmsbOdse0SOBvxWkdNeaRqvSwIsrw54X74eh3xBhcLh6cd9vMoSG2k9zLnyuxdgYNZ7ktSeOodTq.xph3Vx331kwr8Q3nxGhWK8T3wi9dGfjoN.NuFS1vEaDGsUmTn323NukNk1bJX3Qre7iEr3wuxw59370s.VYQ_Q5o_ZSStOv_RqQZnPcoZvzRHjnpDgg1qSuAbE_IqgwL.XaQXz6tMxu4S6dUktxlv5seOlUQUSV2VqqoymebBSOVJ3x6Hwor492CPIyOy5DkpbPs27jzRrDQwfEvNKIBQASYOuEpHpde30lJVWhqf5mNCCidZ0hF0dcMB.ux4grmVUDPw4Mh843JriBYWRPL5JAZ53w1GZzsR97.gLT5ruYGWYAemQDHszVq5gp7Z3xzTFItu_4MOH_SaNC0WZwSu5wwbXlkbChHTfHgGtYBAA.znIderaZTOmxv65C_D0Rdgi.woMUIw4gi8b06XIXD0uHaDSHGzj5z8gYfzg7Y9JjtLHSco5Jxl3.8QisGkcP6LHfugoeIgofuRlgfqp4qKvhChGpDPF7y7Lw00LOQsvFNMps9hebk6Edz3RIHHW88Hvp5h.E7A8fLjB_LD2U1CkyPeISOPVs.Elwfqd4mSkW1Wm0O4h60aMAv3TtUHAB1IRmV.vhbAzVTLKwl2UJ3SqgbBasMH2OdX.H6znJEol2jxtrjYM.vMsWFo2nYAsFdoHEXBfcIZ_rYyusBostHOr2uHMcrOK0ihAYrYQI3WO7FyxbmxrU_e1ptSY.FwwOinPSMks4WuQWJ7C9HOFQ0b7rtCDazViUD6jP8di3LSZPE51FzVBO1uaItWXe98krJmpTVLmMmSLu6JTqyz3kDwWPvDig3XplkVe9aOA39i6uTg.g.O2HQH_pl9p7yAOOAr96xdMoGEVc4NRyMIg0OZxhcU0vCCBcb59fbPNlr4GEN3oxhKXP5qGxaVG9TPr.87TQDN8MBnzwxTltzwMF5T2sPq8DCJGkGxnlHB3pLbgiLUxQHDdezUte.225AELurq4mrunHNjwHa3tVoAYADOof5VP_KsSBh_Kkphcipy3n_utrDo4uvfbFf8N4Fbt0jA694rmfKoQJ9bjv6_kNZlMsz8a9noqnwPVhZygFjE.VwZMVzoIE9miZnZ43KtxxwR4p9jRfi.SixFNaXRp5iSqNGDOKvsoGglyxdsOeSYjjmQDiuKo2_7e2my51D8_UaFEpbbdFlv3iOLIQe6gEtQx7sfBBWo1o9kBrgvehZTGvnPvajGBvKYJTFLXnxQ_qnD6E49eGvXQv6YJzUsyp87_72dZzabdAwjuzMtjrADbF2ZQ1pP6If1P1iGLO1MJbk1GcK_3bd6PEBJpdeEH.tjMdA8RTHluFQzzpjvyziCVuafrhGrjZEGGBOVJCUxVsWfoCTFxCgqw5bNjfLlGU6chtu1H.jCMviIU_fsBzc4ylq_9YCVBnwPgimSm4r45EKaNqO2.sXpQDJj2pcATTESUANRMrb6Ij_94z5b3PwCZkODDBWUc8sKEtp_f2WkEUt97nsJKWVlRWwA2GaQUBap.kvi1pWTNYYHQ01609Ot3I1IBn5YFYFwG8RMKjnFd5OPKcgzXmhFID_VAqEIAy0RwK2mdlkjoTFlSIMqStqE",mdrd: "yVYuVGMtDjJ.uPXnJ4iXLgs6vSf31zE_khN0wIeB.OY-1739786462-1.2.1.1-VlpcTMbPUI5YH1Qsuc_sMm5cdWFeoRfTX0LHj_T7t8o_s.LOMhUOKhOcT0Y7DJ.nTVGYsbgs_PwR4e8Qsig5J52nngXsHhJgvBhT07ALJWTgap2_7Xya8oEgZVqAvpCVVUtpUmWa6xeP38PrHDeOYEdTqwRd_iZgsBUKpFhYy9SsGfHmxl6Sdp0R16RDzsyWg.Whl5by7Q69cbrAmVhuXEB.gnzQu3IamFOsfgNtY4bq62plA_FKUz8RhiGcTUOUFKM6Gi7Qb5tecafTrfFc_Plj_5EvCEBA97cQkH5FryTg.id3_YOmCtVI71Jh.Mwr97Xsn2K4nzKWAE8kdJotPQ1YWEyosTuTBvwa4EACaZIyrPOC81gP.DnaF0GbMjBZv35AQiB0CETZIelnFel0Nw9QYMaCihPwzcQ6Sqlcy48i28M078rfr2mdtke5dtaW3hTNbBT_tikLv6HUwgdbPW9iUc_MKbrQl65eqrwqz_pT1x2DtGt9dvTbFC1Zw4t3wCvwOuvVnnXxERMQUpIe88PuFnefo3mvJzeoEOr.1Ern54USUJC3qTez0zLxV_KcrgQNzP4XMZYleEs0nnNoowc3nkVqMhZkydrAXqYBZXmFvcN4m7pwbKPRFV8EfqF.94LEo2k1OOF7CWvCNLQo6PX85g2mPkz9dMywJLQnLPLXdzox8Wyr2fXo2tWOaO8t.Vy1Th6Yci82ZqqqSPUyEsKkmUg.Nt19celbtngse6CUgTXgwxJcB9xJcdhwH9oAOo6bwUeW4z6_b0YshJTQOLAcK8pJYggNemCSg4HoHhMKjyOqQmTckaU6zIm1ewOGcL1J6Qr1d0f21doPbAuYQ.Kvghz.UBPmloa_UstMduCaUtCQ5FpY0zzRCZvmgqS1ddcaYzjuhNQqeEaQ2oqNeGlr9tsRTkz1g1TH0KrGNFUqtkUA75FdwHO9Ew1_VyT_BrvT_8586lRhzJ_X2lSJxuronskp5dOo2n_MZU.X71nCo7Qunq7.d5_DrJQvHaFUIQZiQ1A.JA3guRdfgzRiUdLlArclwXHYwHAbtAX0gmAhkOTMwUAwaavqjBkv3iwvQ4BERQtfjYLiVUjJZc1HHONz5f7OPCb_iqr6kLvViBKd39YabHC568sYZJNNBIjitNLa6d7XrNn.yqstrbOhKAOu3vUj1pBLCaA5ajsyuSSkTl2CyFeoekBRXU_ZnAvXD3tox61s02NnTGdCtFre0lLVGsRPiMvminRpe.FUWbkNxBDl6WAtIa8HS9HBx48V_Gje3_1Hup0Vc98vFuzmFIBppPOuQA9Kzw_whFdgDWRD4wHIL5E9Qqaw7so.HYMz0jIn2BayN5PJWHU5xWUCnXiD.aX9n489QKHRH6u2Uj9Oy7WhEMXERfUvsnwZy7hZ_OjvUN0hWq6KYXBXjh6DirO9NK5fTLID4vf3f01GlkaA37ds.tnX4Wv1kwIjIIP6GhMcliP4xerK_7O9IUSNAOqyPBOCX8Qqb2eibD3J5_MDCpqwcWB4K5jMgPHP0GIhAyFNCgoLhVXtTTMHVoGuBClVdx8wuM4KysW9OMBATUpOxcZ2vR2o4.PSIvWMUBocYVwMzGACnOweLSv4tvoUwKs1KA5J2emq9udNWfNKEi67N.lagigWXQNGQ3Vy56oD.ms6ghelWnknAAm_OUVC_atl_4xz.mpRT33q2wE8Dw0L9ESrq71zpak4rgpSUU9nGe9Oq45LA1lUER8ogUPWqijY745kEuwGvzRqzMyvEX7YP9VKrc2tgGfKhuzsi6QbPE5ePV8fKH0m51di9ymTmkiW8iAkNbleYW1yXxmcRBlIb4Hdiqi2RE06cAi_zyvIf4jCLcrjLvZ_A_g0WY8jmw_a9j1ESATgTouOcGDSzGWsPY65B5Ea2vQODAcnGL9svdIigucjhEOWouFlPnkBOIAsMAFQ0f3fVgpjkLa.C1bHfoRC4.EzpsR0sQbnrAPE"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=9134ef0cbb1fa3d0';window._cf_chl_opt.cOgUHash = location.hash === '' && location.href.indexOf('#') !== -1 ? '#' : location.hash;window._cf_chl_opt.cOgUQuery = location.search === '' && location.href.slice(0, location.href.length - window._cf_chl_opt.cOgUHash.length).indexOf('?') !== -1 ? '?' : location.search;if (window.history && window.history.replaceState) {var ogU = location.pathname + window._cf_chl_opt.cOgUQuery + window._cf_chl_opt.cOgUHash;history.replaceState(null, null, "\/search?q=Rui%20Cheng&__cf_chl_rt_tk=ZLT0zhpoGPHVT0wPhJu9HA_1sA9BLiF3Q6OC_pKMpBQ-1739786462-1.0.1.1-Dba9caridMCNeFeH1z6sSAmDML2iLqhgGYCS.szQwp8" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>