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Infectious Disease Modelling 2022年第1期7卷 184-198页

作者： Nicholas Steyn Audrey Lustig Shaun C.Hendy Rachelle N.Binny Michael J.Plank Department of Physics University of AucklandNew Zealand School of Mathematics and Statistics University of CanterburyNew Zealand te punaha matatini Centre of Research Excellence in Complex SystemsNew Zealand Manaaki Whenua LincolnNew Zealand

We couple a simple model of quarantine and testing strategies for international travellers with a model for transmission of SARS-CoV-2 in a partly vaccinated *** use this model to estimate the risk of an infectious traveller causing a community outbreak under various border control strategies and different levels of vaccine coverage in the *** are calculated from N¼100,000 independent realisations of the stochastic *** find that strategies that rely on home isolation are significantly higher risk than the current mandatory 14-day stay in government-managed ***,combinations of testing and home isolation can still reduce the risk of a community outbreak to around one outbreak per 100 infected *** also find that,under some circumstances,using daily lateral flow tests or a combination of lateral flow tests and polymerase chain reaction(PCR)tests can reduce risk to a comparable or lower level than using PCR tests *** with controls on the number of travellers from countries with high prevalence of COVID-19,our results allow different options for managing the risk of COVID-19 at the border to be *** can be used to inform strategies for relaxing border controls in a phased way,while limiting the risk of community outbreaks as vaccine coverage increases.

关键词： vaccine testing border

A Novel Method for Resolving and Completing Authors' Country Affiliation Data in Bibliographic Records

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Journal of Data and Information Science 2020年第3期5卷 97-115页

作者： Ba Xuan Nguyen Jesse David Dinneen Markus Luczak-Roesch School of Information Management Victoria University of WellingtonWellingtonNew Zealand Posts and telecommunications Institute of technology Ho Chi Minh CityVietnam Berlin School of Library and Information Science Humboldt-Universitat zu BerlinBerlinGermany te punaha matatini-The New Zealand Centre of Research Excellence for Complex Systems and Networks New Zealand

Purpose: Our work seeks to overcome data quality issues related to incomplete author affiliation data in bibliographic records in order to support accurate and reliable measurement of international research collaboration(IRC).Design/methodology/approch: We propose, implement, and evaluate a method that leverages the Web-based knowledge graph Wikidata to resolve publication affiliation data to particular countries. The method is tested with general and domain-specific data ***: Our evaluation covers the magnitude of improvement, accuracy, and consistency. Results suggest the method is beneficial, reliable, and consistent, and thus a viable and improved approach to measuring *** limitations: Though our evaluation suggests the method works with both general and domain-specific bibliographic data sets, it may perform differently with data sets not tested here. Further limitations stem from the use of the R programming language and R libraries for country identification as well as imbalanced data coverage and quality in Wikidata that may also change over *** implications: The new method helps to increase the accuracy in IRC studies and provides a basis for further development into a general tool that enriches bibliographic data using the Wikidata knowledge ***: This is the first attempt to enrich bibliographic data using a peer-produced, Webbased knowledge graph like Wikidata.

关键词： International research collaboration measurement Bibliographic data Country identification Knowledge graphs Wikidata Open data

Safe-event pruning in spacecraft conjunction management

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Astrodynamics 2023年第4期7卷 401-413页

作者： Sébastien Henry Roberto Armellin Thibault Gateau Guggenheim School of Aerospace Engineering Georgia Institute of TechnologyAtlantaGA 30332USA te punaha Atea-Space Institute The University of AucklandAuckland 1010New Zealand Department of Aerospace Vehicles Design and Control Institut Superieur de I'Aeronautique et de I'EspaceToulouse 31055France

Spacecraft conjunction management plays a crucial role in the mitigation of space *** a conjunction event occurs,resources and time are spent analyzing,planning,and potentially maneuvering the *** work contributes to a subpart of the problem:Confidently identifying events that will not lead to a high collision probability,and therefore do not require further *** method reduces the dimensionality of the data via principal component analysis(PCA)on a subset of ***-risk regions are then determined by clustering the projected data,and events that do not belong to a high-risk cluster are pruned.A genetic algorithm(GA)is developed to optimize the number of clusters and feature selection of the ***,an ensemble learning framework is proposed to combine the suboptimal models for better *** results show that the first set of parameters pruned approximately 50%of the events in the testing set with no false negatives,whereas the second set of parameters pruned 70%of the events and maintained a near-perfect *** results could benefit the optimization of operational resources and allow operators to focus better on the events of interest.

关键词： space situational awareness collision avoidance genetic algorithm(GA) ensemble learning

Are the well-fed less thirsty?Effects of drought and salinity on New Zealand mangroves

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Journal of Plant Ecology 2022年第1期15卷 85-99页

作者： Sridevi Ravi Martin K-FBader Tim Young Mark Duxbury Michael Clearwater Cate Macinnis-Ng Sebastian Leuzinger School of Science Auckland University of TechnologyAucklandNew Zealand Department of Forestry and Wood technology Linnaeus UniversityVäxjöSweden Centre for Biomedical and Chemical Sciences School of ScienceAuckland University of TechnologyAucklandNew Zealand School of Science and Environmental Research Institute University of WaikatoPrivate Bag 3105HamiltonNew Zealand School of Biological Sciences and te Pūnaha matatini University of AucklandAucklandNew Zealand

Despite a large number of studies examining the effects of abiotic stress factors on plants,the mechanistic explanations of drought-induced tree mortality remain inconclusive and even less is known about how multiple stressors *** role of non-structural carbohydrates(NSCs)in preventing or postponing drought mortality is gaining ***,we tested the role of NSCs in mitigating the effects of drought and salinity in New Zealand mangroves,Avicennia marina *** experimentally manipulated plant NSC levels,prior to subjecting them to combinations of drought and *** growth and survival rates were 2-and 3-fold higher in the high-NSC(H-NSC)group than in the low-NSC(L-NSC)group under high salinity and drought conditions,*** 12 weeks under high salinity-high drought conditions,the H-NSC group showed higher stem hydraulic conductivity(281±50 mmol cm^(−1)s^(−1)MPa^(−1))compared with the L-NSC group(134±40 mmol cm^(−1)s^(−1)MPa^(−1)).Although starch levels remained relatively constant,we found a 20%increase in soluble sugars in the stems of H-NSC group under high drought and high salinity in week 8 compared with week *** results suggest(i)an important role of NSCs in mitigating the effects of low soil water potential caused by drought and salinity,and(ii)sink-limited growth under conditions of combined salinity and drought.

关键词： non-structural carbohydrates Avicennia marina subsp.australasica drought and salt tolerance carbon limitation temperate mangroves

Message from the Guest Editors of the Special Issue on Space Traffic Management

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Astrodynamics 2023年第4期7卷 381-381页

作者： Yu Jiang Roberto Armellin Zhihui Li State Key Laboratory of Astronautic Dynamics Xi’an Satellite Control CenterXi’an 710043China te punaha Atea–Space Institute the University of AucklandAuckland 1010New Zealand China Aerodynamics Research and Development Center Beijing BranchBeijing 100191China

Dear authors and readers,Since 1957,over 6400 rocket launches have deployed more than 15,900 satellites into the Earth’s *** then,there have been more than 600 fragmentation events caused by collisions,explosions,aerodynamic break-ups,and other *** that the space environment is a finite and shared resource,there is a growing need for space traffic management(STM).

关键词： fragmentation finite break

Research topics in the international research collaboration measurement domain

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Data Science and Informetrics 2022年第1期2卷 1-9页

作者： Ba Xuan Nguyen Jesse David Dinneen Markus Luczak-Roesch School of Information Management Victoria University of WellingtonWellingtonNew Zealand Berlin School of Library and Information Science Humboldt-Universitat zu BerlinBerlinGermany te Pūnaha matatini Aotearoa New Zealand's Centre of Research Excellence for Complex SystemsNew Zealand Posts and telecomm unications In stitute of tech no logy Ho Chi Minh CityVietnam

Here we report on a study that combined a scoping review with co-occurrence analysis to assess the current state of publications and research topics in the area of international research collaboration measurement(IRCM).Our study found that IRCM studies have been published in source titles of diverse subject areas and that there are two core research topics that have been commonly discussed across different subject areas in the IRCM domain-scientific productivity measurement and scientific impact *** appearance of papers about IRCM in venues beyond those concerned only with bibliometric measures indicates the broad importance of IRCM for diverse research subjects,and that studies of IRC within particular fields should draw on diverse venues to provide a holistic and interdisciplinary picture of IRCM.

关键词： International research collaboration Measurement Research topic Scoping review Co-occurrence analysis

Design and guidance of a multi-active debris removal mission

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Astrodynamics 2023年第4期7卷 383-399页

作者： Minduli C.Wijayatunga(B) Roberto Armellin Harry Holt Laura Pirovano Aleksander A.Lidtke te Pūnaha Atea–Space Institute The University of AucklandAuckland 1010New Zealand Astroscale Japan Inc. 1-16-4-16 KinshiSumida-kuTokyoJapan

Space debris have become exceedingly dangerous over the years as the number of objects in orbit continues to *** debris removal(ADR)missions have gained significant interest as effective means of mitigating the risk of collision between objects in *** study focuses on developing a multi-ADR mission that utilizes controlled reentry and *** mission comprises two spacecraft:a Servicer that brings debris to a low altitude and a Shepherd that rendezvous with the debris to later perform a controlled reentry.A preliminary mission design tool(PMDT)was developed to obtain time and fuel optimal trajectories for the proposed mission while considering the effect of J2,drag,eclipses,and duty *** PMDT can perform such trajectory optimizations for multi-debris missions with computational time under a *** guidance schemes are also studied,taking the PMDT solution as a reference to validate the design methodology and provide guidance solutions to this complex mission profile.

关键词： active debris removal(ADR) trajectory design optimization autonomous guidance low-thrust electric propulsion △u-law guidance Q-law guidance