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Two-Way Interactions Between Equatorially-Trapped Waves and the Barotropic Flow

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Chinese Annals of Mathematics,Series B 2009年第5期30卷 539-568页

作者： James FERGUSON Boualem KHOUIDER Maryam NAMAZI Department of Mathematics and Statistics University of Victoria Department of Mathematics and Statistics University of VictoriaPO BOX 3045 STN CSC Victoria

Lateral energy exchange between the tropics and the midlatitudes is a topic of great importance for understanding Earth＇s climate system. In this paper, the authors address this issue in an idealized set up through simple shallow water models for the interactions between equatorially trapped waves and the barotropic mode, which supports Rossby waves that propagate poleward and can excite midlatitude teleconnection patterns. It is found here that the interactions between a Kelvin wave and a fixed meridionai shear （mimicking the jet stream） generates a non-trivial meridional velocity and meridional convergence in phase with the upward motion that can attain a maximum of about 50%, which oscillates on frequencies ranging from one day to 10 days. When, on the other hand, the barotropic flow is forced by slowly propagating Kelvin waves a complex flow pattern emerges; it consists of a phase-locked barotropic response that is equatoriaily trapped and that propagates eastward with the forcing Kelvin wave and a certain number of planetary Rossby waves that propagate westward and toward the poles as seen in nature. It is suggested here that the poleward propagating waves are to some sort of multi-way resonant interaction with the phase locked response. Moreover, it is shown here that a numerical scheme with dispersion properties that depend on the direction perpendicular to the direction of propagation, namely the 2D central scheme of Nessyahu and Tadmor, can artificially alter significantly the topology of the wave fields and thus should be avoided in climate models.

关键词： Equatorially trapped waves Wave interactions Jet stream Rossby waves Phase locked Dispersion relation Central scheme Climate modeling

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Event-triggered robust MPC of nonlinear cyber-physical systems against DoS attacks

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Science China(Information Sciences) 2022年第1期65卷 22-38页

作者： Qi SUN Jicheng CHEN Yang SHI Department of Mechanical Engineering University of Victoria

This paper proposes an event-triggered robust nonlinear model predictive control(NMPC) framework for cyber-physical systems(CPS) in the presence of denial-of-service(Do S) attacks and additive disturbances. In the framework, a new robustness constraint is introduced to the NMPC optimization problem in order to deal with additive disturbances, and a packet transmission strategy is designed for NMPC such that Do S attacks can be tackled. Then, an event-triggered mechanism, which accommodates Do S attacks occurring in the communication network, is proposed to reduce the communication cost for resource-constrained CPSs. Besides, we prove that the NMPC algorithm is recursively feasible and the closed-loop system is input-to-state practical stable under some sufficient conditions. Simulation examples and comparisons are conducted to show the effectiveness of the proposed NMPC algorithm.

关键词： cyber-physical systems nonlinear model predictive control event-triggered mechanism robust control denial-of-service attacks

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From common gardens to candidate genes:an elegant case of homoploid hybrid speciation

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Molecular Plant 2021年第2期14卷 200-201页

作者： Gregory L.Owens Department of Biology University of VictoriaVictoriaBCCanada

Homoploid hybrid speciation(HHS),where genetic contributions from two species combine to produce a third species without a change in pioidy,remains an intriguing and enigmatic evolutionary *** studies in the past decade have shown that introgression and admixture between species is common,and yet well documented cases of HHS remain rare(Schumer et al.,2014;Marques et al.,2019).This strikes at a key feature of HHS;it is a far higher bar to prove that hybridization was critical for speciation than it is to show that introgression *** former requires us to know how reproductive isolation(RI)is achieved,identify hybrid ancestry,and definitively link hybrid ancestry with reproductive *** this in mind,the work by Wang et al.(2020)fully documenting a case of HHS is particularly impressive in terms of both the scope and clarity of the results.

关键词： al. combine intro

The Best Answers？ Think Twice： Identifying Commercial Campagins in the CQA Forums

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Journal of Computer Science & Technology 2015年第4期30卷 810-828页

作者：陈诚吴逵 Venkatesh Srinivasan Kesav Bharadwaj R Department of Computer Science University of Victoria Victoria V8P 5C2 Canada

In an emerging trend, more and more Internet users search for information from Community Question and Answer （CQA） websites, as interactive communication in such websites provides users with a rare feeling of trust. More often than not, end users look for instant help when they browse the CQA websites for the best answers. Hence, it is imperative that they should be warned of any potential commercial campaigns hidden behind the answers. Existing research focuses more on the quality of answers and does not meet the above need. Textual similarities between questions and answers are widely used in previous research. However, this feature will no longer be effective when facing commercial paid posters. More context information, such as writing templates and a user’s reputation track, needs to be combined together to form a new model to detect the potential campaign answers. In this paper, we develop a system that automatically analyzes the hidden patterns of commercial spam and raises alarms instantaneously to end users whenever a potential commercial campaign is detected. Our detection method integrates semantic analysis and posters’ track records and utilizes the special features of CQA websites largely different from those in other types of forums such as microblogs or news reports. Our system is adaptive and accommodates new evidence uncovered by the detection algorithms over time. Validated with real-world trace data from a popular Chinese CQA website over a period of three months, our system shows great potential towards adaptive detection of CQA spams.

关键词： CQA forum anomaly detection paid poster online detection system

Forging an easier path through graduation:Improving the patient transition from paediatric to adult critical care

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World Journal of Critical Care Medicine 2025年第1期14卷 82-90页

作者： Stephen Warrillow Ben Gelbart Jess Stevens Gordon Baikie Mark E Howard Department of Intensive Care Austin HealthHeidelberg 3084VictoriaAustralia Department of Critical Care The University of MelbourneParkville 3010VictoriaAustralia Department of Intensive Care Royal Children’s HospitalParkville 3010VictoriaAustralia Living with Disability Research Centre La Trobe UniversityBundoora 3086VictoriaAustralia Department of Neurodevelopment&Disability Royal Children’s HospitalParkville 3010VictoriaAustralia Department of Paediatrics The University of MelbourneParkville 3010VictoriaAustralia Department of Respiratory and Sleep Medicine Austin HealthHeidelberg 3084VictoriaAustralia Department of Medicine Austin HealthThe University of MelbourneHeidelberg 3084VictoriaAustralia

Adolescence and the journey to adulthood involves exciting opportunities as well as psychosocial stress for young people growing *** normal experiences are potentially magnified for teenagers living with chronic illness or disability and their *** in care have improved survival for children with a variety of serious chronic medical conditions such that many who may once have died in childhood now survive well into adulthood with ongoing *** those with highly complex needs,care is often provided at major paediatric hospitals with expertise,specially trained personnel,and resources to support young people and their families for the first decades of *** the end of adolescence,however,it is generally appropriate and necessary for young adults and their caregivers to transition to the care of clinicians trained in the care of adults at general *** there are some well-managed models to support this journey of transition,these are often specific to certain conditions and usually do not involve intensive *** patients may encounter considerable challenges during this *** may include the loss of established therapeutic relationships,a perception of austerity and reduced amenity in facilities oriented to caring for adult patients,and care by clinicians with less experience with more common paediatric *** addition,there is a risk of potential conflict between clinicians and families regarding goals of care in the event of a critical illness when it occurs in a young adult with major disability and long-term health *** challenges present genuine opportunities to better understand the transition from paediatric to adult-based care and to improve processes that assist clinicians who support patients and families as they shift between healthcare settings.

关键词： Paediatric intensive care Disability Adult intensive care Transition Critical care

Smart mid-infrared metasurface microspectrometer gas sensing system

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Microsystems & Nanoengineering 2024年第3期10卷 273-281页

作者： Jiajun Meng Sivacarendran Balendhran Ylias Sabri Suresh K.Bhargava Kenneth B.Crozier School of Physics University of MelbourneVictoriaAustralia Australian Research Council(ARC)Centre of Excellence for Transformative Meta-Optical Systems(TMOS) University of MelbourneVictoriaAustralia Centre for Advanced Materials&Industrial Chemistry(CAMIC) STEM collegeRMIT UniversityVictoriaAustralia Department of Electrical and Electronic Engineering University of MelbourneVictoriaAustralia

Smart,low-cost and portable gas sensors are highly desired due to the importance of air quality monitoring for environmental and defense-related ***,electrochemical and nondispersive infrared(IR)gas sensors are designed to detect a single specific *** IR spectroscopy-based sensors provide superior performance,their deployment is limited due to their large size and high *** this study,a smart,low-cost,multigas sensing system is demonstrated consisting of a mid-infrared microspectrometer and a machine learning *** microspectrometer is a metasurface filter array integrated with a commercial IR camera that is consumable-free,compact(~1 cm^(3))and lightweight(~1 g).The machine learning algorithm is trained to analyze the data from the microspectrometer and predict the gases *** system detects the greenhouse gases carbon dioxide and methane at concentrations ranging from 10 to 100%with 100%*** also detects hazardous gases at low concentrations with an accuracy of 98.4%.Ammonia can be detected at a concentration of 100 ***,methyl-ethyl-ketone can be detected at its permissible exposure limit(200 ppm);this concentration is considered low and *** study demonstrates the viability of using machine learning with IR spectroscopy to provide a smart and low-cost multigas sensing platform.

关键词： Smart gases system

Saposhnikoviae divaricata:a phytochemical,pharmacological,and pharmacokinetic review

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Chinese Journal of Natural Medicines 2017年第4期15卷 255-264页

作者： Jenny Kreiner Edwin Pang George Binh Lenon Angela Wei Hong Yang School of Health and Biomedical Sciences RMIT UniversityVictoria 3001Australia School of Science RMIT UniversityVictoria 3001Australia

Saposhnikoviae divaricata(Turcz.) Schischk(SD) is a traditional Chinese herb commonly used to treat clinical conditions such as rheumatism and allergic rhinitis. This review article evaluates a collection of works on in vitro and biochemical studies of SD. The discourse on the diverse class of chromones and coumarins in SD offers an insight to the pharmacological effects of these bioactive constituents as anti-inflammatory, analgesic, immunoregulatory, antioxidative, and anti-proliferative agents. It is highlighted that there is a structural relationship between the constituents and bioactive activities, which in effect provides a valid reasoning and reaffirm the use of SD in the treatment of the pathologies in Chinese medicine.

关键词： Saposhnikoviae divaricata Chinese herbal medicine Anti-inflammatory Analgesic Immunomodulatory Anti-proliferative

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Determinants of male health： the interaction of biological and social factors

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Asian Journal of Andrology 2010年第3期12卷 291-297,I0007页

作者： David M. de Kretser（澳大利亚） Monash university Clayton Victoria 3168 Australia

This review discusses the social and biological factors that may influence male development from conception to adulthood and also underlie the development of health disorders. It will provide assistance to those who may be considering the formulation of a male health policy. It aims to emphasize that social determinants function on a bio- logical background that is profoundly influenced by a male＇s genome, inherited from his parents. The importance of the male-specific reproductive disorders is emphasized, but these also affect somatic structures through the secretion of androgens secreted from the testes. In turn, the function of the cardiovascular and nervous systems can signifi- cantly influence reproductive processes such as erectile dysfunction.

关键词： infertility genetics impotence health policy

Lightweight privacy-preserving truth discovery for vehicular air quality monitoring

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Digital Communications and Networks 2023年第1期9卷 280-291页

作者： Rui Liu Jianping Pan Department of Computer Science University of VictoriaVictoriaBCV8P 5C2Canada

Air pollution has become a global concern for many *** crowdsensing systems make it possible to monitor air quality at a fine *** better utilize the sensory data with varying credibility,truth discovery frameworks are ***,in urban cities,there is a significant difference in traffic volumes of streets or blocks,which leads to a data sparsity problem for truth *** the privacy of participant vehicles is also a crucial *** first present a data masking-based privacy-preserving truth discovery framework,which incorporates spatial and temporal correlations to solve the sparsity *** further improve the truth discovery performance of the presented framework,an enhanced version is proposed with anonymous communication and data *** frameworks are more lightweight than the existing cryptography-based *** also evaluate the work with simulations and fully discuss the performance and possible extensions.

关键词： Privacy preserving Truth discovery Crowdsensing Vehicular networks

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