{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,17]],"date-time":"2026-07-17T21:08:14Z","timestamp":1784322494677,"version":"3.55.0"},"reference-count":33,"publisher":"Institute of Electrical and Electronics Engineers (IEEE)","issue":"3","license":[{"start":{"date-parts":[[2021,9,1]],"date-time":"2021-09-01T00:00:00Z","timestamp":1630454400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/ieeexplore.ieee.org\/Xplorehelp\/downloads\/license-information\/IEEE.html"},{"start":{"date-parts":[[2021,9,1]],"date-time":"2021-09-01T00:00:00Z","timestamp":1630454400000},"content-version":"stm-asf","delay-in-days":0,"URL":"https:\/\/doi.org\/10.15223\/policy-029"},{"start":{"date-parts":[[2021,9,1]],"date-time":"2021-09-01T00:00:00Z","timestamp":1630454400000},"content-version":"stm-asf","delay-in-days":0,"URL":"https:\/\/doi.org\/10.15223\/policy-037"}],"funder":[{"DOI":"10.13039\/501100012166","name":"National Key Research and Development Program of China","doi-asserted-by":"publisher","award":["2019YFC1511302"],"award-info":[{"award-number":["2019YFC1511302"]}],"id":[{"id":"10.13039\/501100012166","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["61971060"],"award-info":[{"award-number":["61971060"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IEEE Trans. on Green Commun. Netw."],"published-print":{"date-parts":[[2021,9]]},"DOI":"10.1109\/tgcn.2021.3068333","type":"journal-article","created":{"date-parts":[[2021,3,24]],"date-time":"2021-03-24T19:28:38Z","timestamp":1616614118000},"page":"1236-1247","source":"Crossref","is-referenced-by-count":107,"title":["Trajectory Optimization for UAV Emergency Communication With Limited User Equipment Energy: A Safe-DQN Approach"],"prefix":"10.1109","volume":"5","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0694-5844","authenticated-orcid":false,"given":"Tiankui","family":"Zhang","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1422-5385","authenticated-orcid":false,"given":"Jiayi","family":"Lei","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6389-8941","authenticated-orcid":false,"given":"Yuanwei","family":"Liu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4277-6857","authenticated-orcid":false,"given":"Chunyan","family":"Feng","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8337-5884","authenticated-orcid":false,"given":"Arumugam","family":"Nallanathan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"263","reference":[{"key":"ref33","doi-asserted-by":"publisher","DOI":"10.1017\/CBO9780511804441"},{"key":"ref32","first-page":"8092","article-title":"A Lyapunov-based approach to safe reinforcement learning","author":"chow","year":"2018","journal-title":"Advances in neural information processing systems"},{"key":"ref31","author":"liang","year":"2018","journal-title":"Accelerated primal-dual policy optimization for safe reinforcement learning"},{"key":"ref30","article-title":"Study on enhanced LTE support for aerial vehicles (Release 15)","year":"2017"},{"key":"ref10","doi-asserted-by":"publisher","DOI":"10.1109\/MWC.2018.1800196"},{"key":"ref11","doi-asserted-by":"publisher","DOI":"10.1109\/TVT.2019.2952549"},{"key":"ref12","doi-asserted-by":"publisher","DOI":"10.1109\/JSAC.2018.2874145"},{"key":"ref13","article-title":"Machine learning empowered trajectory and passive beamforming design in UAV-RIS wireless networks","author":"liu","year":"2020","journal-title":"IEEE J Sel Areas Commun"},{"key":"ref14","doi-asserted-by":"publisher","DOI":"10.1109\/JSAC.2018.2844979"},{"key":"ref15","doi-asserted-by":"publisher","DOI":"10.1109\/JSAC.2017.2680898"},{"key":"ref16","doi-asserted-by":"publisher","DOI":"10.1109\/TCOMM.2016.2611512"},{"key":"ref17","doi-asserted-by":"publisher","DOI":"10.1109\/TWC.2020.3011881"},{"key":"ref18","doi-asserted-by":"publisher","DOI":"10.1109\/TII.2019.2948406"},{"key":"ref19","doi-asserted-by":"publisher","DOI":"10.1109\/TWC.2018.2838134"},{"key":"ref28","doi-asserted-by":"publisher","DOI":"10.1109\/MWC.2018.1800160"},{"key":"ref4","doi-asserted-by":"publisher","DOI":"10.1109\/ICCNC.2016.7440563"},{"key":"ref27","doi-asserted-by":"publisher","DOI":"10.1109\/LCOMM.2019.2906194"},{"key":"ref3","doi-asserted-by":"publisher","DOI":"10.1109\/MPRV.2017.11"},{"key":"ref6","doi-asserted-by":"publisher","DOI":"10.1109\/JSYST.2009.2026783"},{"key":"ref29","doi-asserted-by":"publisher","DOI":"10.1109\/JIOT.2020.2979521"},{"key":"ref5","doi-asserted-by":"publisher","DOI":"10.1109\/COMST.2019.2906228"},{"key":"ref8","doi-asserted-by":"publisher","DOI":"10.1109\/TCOMM.2019.2895831"},{"key":"ref7","doi-asserted-by":"publisher","DOI":"10.1109\/MCOM.2016.7470933"},{"key":"ref2","doi-asserted-by":"publisher","DOI":"10.1109\/MWC.2019.1800467"},{"key":"ref9","doi-asserted-by":"publisher","DOI":"10.1109\/TVT.2020.3015578"},{"key":"ref1","author":"munich","year":"2015","journal-title":"Natcatservice Loss Events Worldwide 1980–2014"},{"key":"ref20","doi-asserted-by":"publisher","DOI":"10.1109\/JPROC.2019.2954595"},{"key":"ref22","doi-asserted-by":"publisher","DOI":"10.1109\/TVT.2019.2923214"},{"key":"ref21","doi-asserted-by":"publisher","DOI":"10.1109\/TII.2020.2985715"},{"key":"ref24","doi-asserted-by":"publisher","DOI":"10.1109\/JSAC.2018.2864373"},{"key":"ref23","doi-asserted-by":"publisher","DOI":"10.1109\/TWC.2019.2935201"},{"key":"ref26","doi-asserted-by":"publisher","DOI":"10.1109\/MVT.2016.2589970"},{"key":"ref25","doi-asserted-by":"publisher","DOI":"10.1109\/TVT.2019.2920284"}],"container-title":["IEEE Transactions on Green Communications and Networking"],"original-title":[],"link":[{"URL":"http:\/\/xplorestaging.ieee.org\/ielx7\/7511293\/9520384\/09385412.pdf?arnumber=9385412","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2022,5,10]],"date-time":"2022-05-10T14:54:09Z","timestamp":1652194449000},"score":1,"resource":{"primary":{"URL":"https:\/\/ieeexplore.ieee.org\/document\/9385412\/"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2021,9]]},"references-count":33,"journal-issue":{"issue":"3"},"URL":"https:\/\/doi.org\/10.1109\/tgcn.2021.3068333","relation":{},"ISSN":["2473-2400"],"issn-type":[{"value":"2473-2400","type":"electronic"}],"subject":[],"published":{"date-parts":[[2021,9]]}}}