CINXE.COM

<!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: '91353cd4efed5fdb',cH: 'fQ_MptugVhSfPAoUpieXZ_BIttpnAVlZWd8v3_O8wy4-1739789648-1.2.1.1-qFNl54MPUssLGV.we4uULHlwZTlCqGIOP0kw8TezDmrZyklC5EYFFjVhzuXPUCCV',cUPMDTk: "\/abstracts\/search?q=RyongJin%20Ri&__cf_chl_tk=H8ETD47pNTdtvbSkI2tldPGI8R5sHYb2Pm25vJKMnR0-1739789648-1.0.1.1-j12psQ2MROuFVvNBhxpNgJ4eyFJZ_Ev.C2E2n22LcJs",cFPWv: 'b',cITimeS: '1739789648',cTTimeMs: '1000',cMTimeMs: '120000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/abstracts\/search?q=RyongJin%20Ri&__cf_chl_f_tk=H8ETD47pNTdtvbSkI2tldPGI8R5sHYb2Pm25vJKMnR0-1739789648-1.0.1.1-j12psQ2MROuFVvNBhxpNgJ4eyFJZ_Ev.C2E2n22LcJs",md: "jePliihZqQ5cV0Tve.rq3huSTG3b1iQ9oEi_32vPiZY-1739789648-1.2.1.1-bqCgvbDBWeGjFPyzJCtHBAYVFHRqcVVBLnwhLJT9oXUFA9zf6OUPTpRuuyMGALpHlIErUK_lh3C49lm2Eg1t5IbF5VMrVzK9ZtR0OlOh7b_fbgk8MEosfV2Z8VgnEFFr4sWnRBWGnSS9ElyrDEoa41Vc4.K.al.MVlK.ThUh5hViqfVmjKDKBEXzncP69SlT8f5bejAMjKWhSw6iWR6u7BS0GxykEeDpRxB04AO1xBxsKvWOQmiQfgrjZkVu0TBmQKexFArh03P1BZGDXqUE21H4.R7L.0AA76Ru3aPyh_evp_eB2Fi2XwBWA9NEkTkbCWooorCfvKBI27UPQjv9uRpZsaiu0YUwRJTZ6kf0d7ONt7tl9OyL9dm9.E74d9H.RsX2P_YDpztfnL5vkX7lxqc.J.ZqkWBktUp8DdthoHhRNU1RA_TYYXOMCs5pDXKlUCUFgRe86375Bk2j2N_vxUgf1NI7Ac_buufcPApIZ9v55XNpesKO5nQFBv1GnhUhqaoQ1RL7MyTfTX2GHHx2fdYgpgmSvyaxp7Zr2o.6giCyQonSyIOfsFasMD7GXFxIHc3VSof_Mry6NtgRWh6UeEUyg46z_Ahz7i8XzCBdqLlhuRAIbCtVxoFAIndul0lT8.ggPRo4BE7WYWOhyGXFiknLNv_44Pl6rAC3O43UnjpKWWZlNwDawqK8gFJurNEbPh7b4fIlqhLkavsHTJIfcYACM4xNTNPiBrCcG1mg8TVzvKE3._MROXYNfcdv1OkFLHTWxw44cP_unOxA2m73PDHmhNguddKICQ7d3PZ4nHoA1pKcU4IFDUXNd8MfuFAe6.D4lFTj637crE7f2t5PcsaFCGvKep0f4pVGaT4Bbh9uNrErxymtblWp5P4psoX0._MqEqVWnh9uJhGqhSgSS91mvHkCuviDRM7m4Z67ocnvyTnkA6DaKtbC0ecmbvx34oVdRKS76Zme3xL2SnoofU.nCrA8LEFwMfY9zVRnJ2TqVqMlzpdbKKoTUPA_PlcYnmG2nWzBPqHJ3rKQ260t2JbQS2KmGA7WW3i5eKwUMF3CptfOrnwraoOWlkFOZcpiGmNEReIip.9VjibBA0E21JJCLilUQT8Bghkel3IblhKGFRb2HuawNNFS9137ke80f.zDGvWBq0WqMdsgWNRDDSKOoXNNQJHDjGTw9SG8DCv74sT.JThigJSAy9IyZuOVHgOvXzTzK0BhNMshumGl.3g65IWLXfucO4HHxRO4m_yZznS6Ah64Z5iyHK6Bu0BqYil4KMjCcBNmSwp0MZYKXfHK35CzmQ0.zQ6KraaiA7TXuJHH.IrJJ4DojGxtGW2z1mvjuBR0YPOdfhaVjJnWZ16to4jnnM61wsanN0RSjOcCz7ijl4DCCbxCSGNXb.AOqaUH2Yzjm4mNwEAFYRLdFioaNL666pBos57pJNzzORPaIR8Jdt5H.otQP_Ch71ENARN51aSorHjJxXHe69m0xoyYLynZwCkLsdYWWdSVV7vTtv5pu.gQ.LOJVOHvfBfzYuvT.kJHCsqThPX8CpsUDWpiYKks_qBNogpPJFcV_DYLfQSiqvs4kYnv.xS6En7_M_3gcvEDx.SzxQ9kmSgG8bY.3wFk1owRgmyn7PVfe5dNMAGLF_6SbpOWEX7IBAFBuhZ0_aeu4aiAScIZLvrpIFMGviHhuty4cb48Mnr0hWPpgt0yrrweQTkeqXpe9BAokUlIs.FMZSuuXznvcGcz9VI9KvOEzARC9zjwg_ZerTxPXA0YwqFJSeqGo5lkkbPdX2EnJzXgFGAvkJpvcR0o8X8sLzQMajIRk7SysxKYKCTF.Iyupr2syZqVCD006vaoKURmiD0Otyo6VUkrjlaTU6QPBAmarg9qa.3OiTLh_F6WBEbL08q16XsWM9rhpdRrJlyt2z98k6H2.d8iBKAWk_FBZ.rSu_tiJ5oXGlyxEe0",mdrd: "LiN.xBn3MG0f4a5so1D5E0rY5Q7kAwk83OXH7YUXCsc-1739789648-1.2.1.1-w8b1dYTDlYdcCPJQQCuDsYlZW7RhaAZFsttPQAK1NXvmVb2sXHyOmRE_50ORkVfOKnFn7SrTw04o0ZaKQMD.KfVsezpA5stitmCCugKcdw4N9GgU6ysHtZlb5lMhX9a6kfxg6JsKZbS2vjkZyKE0q_sc39TeKEjGMLhRLXhDaXkVA17P4XGP4dy7rhRedBE00Z4KE00rp2V4I5kWgpGW_XngRimaRpc2MA5RmDmHmpmslywctXFLjFku0xDgzDwHcHJrabXXHY7FV.GaA2K0N1nO2yJhBIAHw0BAcilMYJWKMaVeJvcyRCRksEUyZpT9gNPEChzuJjkpp4r6OC05KWss3iAY.D0FYfSLuptM94O_9Fopl7DwDI5s.HSkJiM5kgaGB0RhBmjZd_6cFb_WyGzy3f92_pFRBNIi2JIN7u4C29azhykBSjt9i6pxyQO3WhdVPZm3mNDEICGwJAwTRVvgMS6skT8RELV4m1EJp.TY3zg5q.QRs.dXL8F7z2TocMZ5P1xHJymte4brxeRFsZWAy9HBx5L_6XoecR_FUkoct6iWdmBKnx.wcdjBCZJVVoCX447WGu_wtOBaLHk4FsRgZHsUObTqRSZilgCTmhGLhh726gzxAilVlfgJy4G9frpl79xD69f7hWFC3dogXeD6fo9Bs0hHTzdA7d7VsRmJdX2Yxr6CxFXKaRZa_VWaaU4hu3UaZvxuwT2e9Hk9l4obmJzZ8JerQqvkQYa7vjoiCaw1_.kQjEm2iL37Euuf_aAY_WxgS80HLSfCyncNDgb.Dgbroa_qEoQKIT6dszIs1Md2DweJVmU5zjgHsQrK6Vb8rmUHo6GzkU.tBAd.Z4HMCSn5FlVBDNRB7x6gPklKia6Yvqb6RzOwxSl6cTX6qDKODT975UwaS5qSijHAoY28Bu56WgMQlDAoedWoERRhS_dl_1aNYxBwlRaiyPFT3cS9mSsYWc9Qee_570MbugHV2nfgu3L_.N6COa3zv6pQbK_cRbNaVL_z1n6VgupVtEgeVhIJudak_h90dpY5y05ZYzsWGH2w3W4Cu9oJKQ6Lj8uUf_cIcoqe12Z6WTX75ET4cCsA_HzebncO.CFJjvGnO0YMRpeDuVEnWR4gSbuZQbaPW0QW_XpzPM0tvK1GbQo8aRPKDZYydgn9g60aP9jnnwHbHnuLpn3WMrl_5um6TAXvI9_pGCg.ljtDGMSMHCHyBYwBKaYiW5_G1e5lp9tA4U9zjDTTm6E6TYQSt4XubZdSMUe4JUrVId4E23C0TrS2eeiUDq9n.iuUlDYTRs5XrkfCIaJJeAnSb1lfdcGN1WG6XOcMDfS8RhruD4w0c2BwgAMcG0FatknhtRrsV3qZgV.IhHf4axedA18V22.H1LXfG5KWrJFVx8lY99eUUBCe5t0bd61egnWPupRsTNnSl9gl_c0r0oEUAgZVZKOSYQH0_Kq21MmNWz2HZ8hbZgGO3WGHyq6N1Bq_DHAATwyOne5KkkoJDuBErhpal.YI8Lp0sU4L9Z8hcJnHSWXUKoYMAnfovrTezeSnnRyBV6dtvpYbKRFR5cNn3aQswKbuoRiZm1qcRrCF0Sr_b.5h7has3LvMxmZqgz9nr6n.kt.FJXVbT43DqTMnNCVPU_gDXeA7vhoWVknXn.ZsHwazU9ONhP9K8_IxSxPTXsPJI_riLVYYvzy3rA5LvpxNi8813SjhTBZ.F1WxmSLrgl4aHLHExYBUzqzZLZ_8kTBDlhSLeMggOWcu4fWr7qzKlzqSdAXBdHPuuMo5KhiCRwhfBv0mBLoG1bqdyJrm5zqvnmUd.add2Dz7D5YVxBsBL1gVqY8CME1MPnH_RbQ8ECW2c1SaznYkHNnKY_LB63O.Jj3STtfXXxC7MqHHD6lzadBbnW3_XdwDUUWKz88.cwUTpKlzPNnXaOHExbx.r.PSOUuf5PVsYkQ3tx_bAnuBb1edMFY.x9kco1DyL2OBti3M"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=91353cd4efed5fdb';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, "\/abstracts\/search?q=RyongJin%20Ri&__cf_chl_rt_tk=H8ETD47pNTdtvbSkI2tldPGI8R5sHYb2Pm25vJKMnR0-1739789648-1.0.1.1-j12psQ2MROuFVvNBhxpNgJ4eyFJZ_Ev.C2E2n22LcJs" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>