Inter-Satellite Cooperative Computing Scheme Driven by Business Graph in LEO Satellite Network by Xiaobo GUO, Zhiyuan REN, Wenchi CHENG, Zhe JI

“…Low earth orbit-satellite network (LEO-SN) has the advantages of wide coverage and short satellite-to-earth link, and has become a current hot research fi eld.A business graph-driven inter-satellite collaborative computing method in LEO-SN was proposed to solve the problem of high transmission delay when the task was offl oaded to the cloud computing center.This method shielded the dynamics of LEO-SN by relying on the weighted time expansion graph model, combined multiple satellite computing resources, and dispatches tasks in the form of a directed acyclic graph to the satellites in the transmission path, thereby realizing the ＆quot;computing while transmitting” of user services in the satellite cluster.The simulation results showed that when the data volume was 5 MB, the latency performance of on-orbit collaborative computing was improved by 58.9% compared to ground cloud computing.…”
Get full text

Research on LEO Satellite Network Routing Security by Wenhao XUE, Tian PAN, Chengcheng LU, Fan YANG, Tao HUANG, Yunjie LIU

“…The design of secure mechanisms and failure recovery mechanisms for inter-satellite routing has become pivotal in maintaining dependable communication within the LEO satellite network.To address the potential security threats faced by satellite networks, the impact of different routing attack behaviors on a typical inter-satellite routing protocol was analyzed and differentiated packet security authentication mechanisms and link failure recovery mechanisms were designed.Additionally, a satellite network emulation platform based on virtualization technology was constructed, enabled the verification of the effectiveness of the designed inter-satellite routing security mechanisms through the emulation of various routing attack scenarios.Furthermore, performance metrics such as CPU utilization and packet processing time were also evaluated before and after the introduction of security mechanisms.Experimental results demonstrated that the proposed inter-satellite routing security mechanism effectively mitigated multiple security threats in the space network environment while reduced communication latency caused by sudden link failures, thereby ensured secure and reliable communication within the LEO satellite network.…”
Get full text

Leo Frobenius auf der Suche nach Timbuktu by Maryse Staiber

“…Cette contribution s’attache à dégager l’intérêt d’un chercheur atypique du début du XXe siècle : Leo Frobenius. À partir de l’étude du 13e chapitre, « L’Arrivée à Tombouctou », de l’ouvrage Auf dem Wege nach Atlantis, nous tenterons de mettre en lumière les ambivalences symptomatiques de la complexité d’une approche préscientifique de l’ethnologie. …”
Get full text

Application Status and Analysis of Starlink Constellation by Yu WANG, Qing LI, Kejun LI, Changlin JIANG, Ye WANG, Yong JIANG, Mingwei XU

Subjects: Get full text

André Léo journaliste. Engagement et témoignage (1866-1871) by Charlotte Cosset, Gilles Malandain

“…L’article propose une contribution à l’histoire du journalisme au xixe siècle à travers le corpus d’un auteur, André Léo, c’est-à-dire Léodile Champseix, née Béra (1824-1900), longtemps oubliée mais aujourd’hui reconnue comme une des voix majeures du féminisme et du socialisme des années 1860 et 1870. …”
Get full text

Inter-satellite link connection strategy for large-scale low earth orbit satellite networks by YAN Feng, NIE Haojian, XIA Weiwei, SHEN Lianfeng

Subjects: “…LEO satellite network…”
Get full text

Analysis on Low-Earth-Orbit Constellation Networking and Adaptability of Ground IP Routing Technology by Ci HE, Yasheng ZHANG, Chenhua SUN, Xudong LI

Subjects: “…LEO constellation system with inter-satellite communication…”
Get full text

Specifying High‐Altitude Electrons Using Low‐Altitude LEO Systems: The SHELLS Model by S. G. Claudepierre, T. P. O'Brien

“…We demonstrate that the model can accurately specify outer radiation belt ( L∼3–7) electron fluxes at two energies, 350 keV and 1 MeV. …”
Get full text

Multi‐Year Statistics of LEO Energetic Electrons as Observed by the Korean NextSat‐1 by Jaeheung Park, Kyoung Wook Min, Hoonkyu Seo, Eo‐Jin Kim, Kwangsun Ryu, Jongdae Sohn, Jongho Seon, Ji‐Hyeon Yoo, Seunguk Lee, Brian Kress, Junchan Lee, Changho Woo, Dae‐Young Lee

“…For <80 keV electrons, the slot‐region outer edge at LEO moves inward with increasing geomagnetic activity, which agrees with previous Van Allen Probes reports. …”
Get full text

Geomagnetic Storm Effects on the LEO Proton Flux During Solar Energetic Particle Events by Kirolosse M. Girgis, Tohru Hada, Akimasa Yoshikawa, Shuichi Matsukiyo, Viviane Pierrard, Susan W. Samwel

“…Abstract During a few solar energetic particle (SEP) events, solar protons were trapped within the geomagnetic field and reached the outer edge of the inner radiation belt. We reproduced this phenomenon by modeling the proton flux distribution at the Low‐Earth Orbit (LEO) for different geomagnetic conditions during solar particle events. …”
Get full text

Research on Coded Caching-Enabled Cooperative Transmission Mechanism in LEO Small Satellite Network by Jian LI, Kaiping XUE, Hancheng LU

“…Along with the rapid development of low earth orbit (LEO) small satellite network, users can access content retrieval service through dense-deployed LEO satellite networks in the future.Due to the long propagation delay of satellite-to-terrestrial link, and also the constraint of limited communication resource and energy resource, it is diffi cult for satellites to provide effi cient content transmission service when facing the pressure of onboard overhead.A coded caching-based cooperative transmission mechanism was proposed in dense-deployed LEO small satellite network to achieve effi cient content distribution.By adopting fi ne-grained coded caching scheme, users could simultaneously receive cached packets from multiple LEO satellites to mitigated the cost of satellite backhaul link and improved the caching effi ciency.The simulation results showed that, after deploying onboard caching, the cost of content transmission could be reduced at least 39%.When coded caching-based transmission scheme was adopted, the cost of content transmission could be further reduced by 9%-42% with the increase of satellites providing cooperative transmission.…”
Get full text

Specifying High Altitude Electrons Using Low‐Altitude LEO Systems: Updates to the SHELLS Model by A. J. Boyd, J. C. Green, T. P. O’Brien, S. G. Claudepierre

Get full text

Development conception of space-ground inteyrated information network LEO mobile and broadband internet constellation by Chenhua SUN, Yongwei XIAO, Weisong ZHAO, Po ZHOU

“…With the extension of global internet and IoT (internet of things),LEO (low earth orbit) communication constellation which can achieve seamless coverage of the world including the two poles once again meets the opportunity for development.An innovative scheme of LEO mobile and broadband internet constellation was proposed after analyzing the characteristics of typical foreign constellations and combining with Science and Technology Innovation 2030 Major Project:Space Integrated Ground Network.Development suggestions that can lay the foundation for relevant research and system construction were presented.…”
Get full text

Une Afrique indienne ? De l’exotisme au syncrétisme chez Leo Frobenius et Leni Riefenstahl by Antoine Menant

“…Dans Les Noubas – Des hommes d’une autre planète (1973) Leni Riefenstahl fait référence à Und Afrika sprach de Leo Frobenius. …”
Get full text

Leo Perutz (1882-1957): Nachts unter der steinernen Brücke. Ein Roman aus dem alten Prag (1953) by Annie Zdenek

“…En situant l’action principale de son roman historique Nachts unter der steinernen Brücke. Ein Roman aus dem alten Prag (1953) dans le ghetto juif des kabbalistes et alchimistes de l’ancienne capitale culturelle des Habsbourg au XVIe siècle, Leo Perutz (1882-1957) s’inscrit dans la tradition de la littérature fantastique du début du siècle dernier où les sciences occultes occupent une place de choix, en relation avec les sphères du pouvoir et de la religion, mais aussi d’autres sciences et savoirs nouveaux. …”
Get full text

Repeated heart rate variability monitoring after myocardial infraction – Cohort profile of the MI-ECG study by Teemu Pukkila, Jani Rankinen, Leo-Pekka Lyytikäinen, Niku Oksala, Kjell Nikus, Esa Räsänen, Jussi Hernesniemi

Get full text

Patients’ experiences in early satiety after total gastrectomy for gastric cancer: a phenomenological study by Salvatore Vaccaro, Matías Eduardo Díaz Crescitelli, Stefano Mastrangelo, Nadia Fornaciari, Elisabetta Reverberi, Silvia Di Leo, Luca Ghirotto

Get full text

START—the Swiss tele-assisted rehabilitation and training program to support transition from inpatient to outpatient care in the subacute phase after a stroke: feasibility, safety... by Szabina Gäumann, Carina Ziller, Carina Ziller, Nele Paulissen, Nele Paulissen, Frank Behrendt, Frank Behrendt, Zorica Suica, Zorica Suica, Björn Crüts, Luana Gammerschlag, Katrin Parmar, Katrin Parmar, Hans Ulrich Gerth, Hans Ulrich Gerth, Leo H. Bonati, Leo H. Bonati, Leo H. Bonati, Corina Schuster-Amft, Corina Schuster-Amft, Corina Schuster-Amft

Get full text

Successful Vaginal Delivery after Induction of Labour in a Patient Treated for Non-Hodgkin’s Lymphoma of the Cervix: A Case Report and Literature Review by Paola Quaresima, Gabriele Saccone, Valeria Zuccalà, Giuseppe Guarascio, Livio Leo, Giuseppina Amendola, Fulvio Zullo, Michele Morelli, Roberta Venturella

Get full text

Combined Dexamethasone Suppression-Corticotropin-Releasing Hormone Stimulation Test in Studies of Depression, Alcoholism, and Suicidal Behavior by Leo Sher

Get full text