| 1. |
- Kristanl, Matej, et al.
(author)
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The Seventh Visual Object Tracking VOT2019 Challenge Results
- 2019
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In: 2019 IEEE/CVF INTERNATIONAL CONFERENCE ON COMPUTER VISION WORKSHOPS (ICCVW). - : IEEE COMPUTER SOC. - 9781728150239 ; , s. 2206-2241
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Conference paper (peer-reviewed)abstract
- The Visual Object Tracking challenge VOT2019 is the seventh annual tracker benchmarking activity organized by the VOT initiative. Results of 81 trackers are presented; many are state-of-the-art trackers published at major computer vision conferences or in journals in the recent years. The evaluation included the standard VOT and other popular methodologies for short-term tracking analysis as well as the standard VOT methodology for long-term tracking analysis. The VOT2019 challenge was composed of five challenges focusing on different tracking domains: (i) VOT-ST2019 challenge focused on short-term tracking in RGB, (ii) VOT-RT2019 challenge focused on "real-time" short-term tracking in RGB, (iii) VOT-LT2019 focused on long-term tracking namely coping with target disappearance and reappearance. Two new challenges have been introduced: (iv) VOT-RGBT2019 challenge focused on short-term tracking in RGB and thermal imagery and (v) VOT-RGBD2019 challenge focused on long-term tracking in RGB and depth imagery. The VOT-ST2019, VOT-RT2019 and VOT-LT2019 datasets were refreshed while new datasets were introduced for VOT-RGBT2019 and VOT-RGBD2019. The VOT toolkit has been updated to support both standard short-term, long-term tracking and tracking with multi-channel imagery. Performance of the tested trackers typically by far exceeds standard baselines. The source code for most of the trackers is publicly available from the VOT page. The dataset, the evaluation kit and the results are publicly available at the challenge website(1).
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| 2. |
- Kristan, Matej, et al.
(author)
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The first visual object tracking segmentation VOTS2023 challenge results
- 2023
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In: 2023 IEEE/CVF International conference on computer vision workshops (ICCVW). - : Institute of Electrical and Electronics Engineers Inc.. - 9798350307443 - 9798350307450 ; , s. 1788-1810
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Conference paper (peer-reviewed)abstract
- The Visual Object Tracking Segmentation VOTS2023 challenge is the eleventh annual tracker benchmarking activity of the VOT initiative. This challenge is the first to merge short-term and long-term as well as single-target and multiple-target tracking with segmentation masks as the only target location specification. A new dataset was created; the ground truth has been withheld to prevent overfitting. New performance measures and evaluation protocols have been created along with a new toolkit and an evaluation server. Results of the presented 47 trackers indicate that modern tracking frameworks are well-suited to deal with convergence of short-term and long-term tracking and that multiple and single target tracking can be considered a single problem. A leaderboard, with participating trackers details, the source code, the datasets, and the evaluation kit are publicly available at the challenge website1
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| 3. |
- Zhao, Bing, 1990, et al.
(author)
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Electrically controlled spin-switch and evolution of Hanle spin precession in graphene
- 2019
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In: 2D Materials. - : IOP Publishing. - 2053-1583. ; 6:3
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Journal article (peer-reviewed)abstract
- Next generation of spintronic devices aims to utilize the spin-polarized current injection and transport to control the magnetization dynamics in the spin logic and memory technology. However, the detailed evolution process of the frequently observed bias current-induced sign change phenomenon of the spin polarization has not been examined in details and the underlying microscopic mechanism is not well understood. Here, we report the observation of a systematic evolution of the sign change process of Hanle spin precession signal in the graphene nonlocal spintronic devices at room temperature. By tuning the interface tunnel resistances of the ferromagnetic contacts to graphene, different transformation processes of Hanle spin precession signal are probed in a controlled manner by tuning the injection bias current/voltage. Detailed analysis and first-principles calculations indicate a possible magnetic proximity and the energy dependent electronic structure of the ferromagnet-graphene interface can be responsible for the sign change process of the spin signal and open a new perspective to realize a spin-switch at very low bias-current or voltage.
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| 4. |
- Chen, Wenjun, et al.
(author)
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A typological framework of non-floodplain wetlands for global collaborative research and sustainable use
- 2022
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In: Environmental Research Letters. - : IOP Publishing. - 1748-9326. ; 17:11
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Research review (peer-reviewed)abstract
- Non-floodplain wetlands (NFWs) are important but vulnerable inland freshwater systems that are receiving increased attention and protection worldwide. However, a lack of consistent terminology, incohesive research objectives, and inherent heterogeneity in existing knowledge hinder cross-regional information sharing and global collaboration. To address this challenge and facilitate future management decisions, we synthesized recent work to understand the state of NFW science and explore new opportunities for research and sustainable NFW use globally. Results from our synthesis show that although NFWs have been widely studied across all continents, regional biases exist in the literature. We hypothesize these biases in the literature stem from terminology rather than real geographical bias around existence and functionality. To confirm this observation, we explored a set of geographically representative NFW regions around the world and characteristics of research focal areas. We conclude that there is more that unites NFW research and management efforts than we might otherwise appreciate. Furthermore, opportunities for cross-regional information sharing and global collaboration exist, but a unified terminology will be needed, as will a focus on wetland functionality. Based on these findings, we discuss four pathways that aid in better collaboration, including improved cohesion in classification and terminology, and unified approaches to modeling and simulation. In turn, legislative objectives must be informed by science to drive conservation and management priorities. Finally, an educational pathway serves to integrate the measures and to promote new technologies that aid in our collective understanding of NFWs. Our resulting framework from NFW synthesis serves to encourage interdisciplinary collaboration and sustainable use and conservation of wetland systems globally.
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| 5. |
- Grönstedt, Tomas, 1970, et al.
(author)
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First and Second Law Analysis of Future Aircraft Engines
- 2013
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In: ASME Turbo Expo, 2013. - 9780791855133 ; 2:GT2013-95516
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Conference paper (peer-reviewed)abstract
- An optimal baseline turbofan cycle designed for a performance level expected to be available around year 2050 is established. Detailed performance data are given in take-off, top of climb and cruise to support the analysis. Losses are analyzed based on a combined use of the first and second law of thermodynamics, to establish a basis for discussion on future radical engine concepts and to quantify loss levels of very high performance engines. In the light of the performance of the future baseline engine, three radical cycles designed to reduce the observed major loss sources are introduced. The combined use of a first and second law analysis of an open rotor engine, an intercooled recuperated engine and an engine working with a pulse detonation combustion core is presented. In the past, virtually no attention has been paid to the systematic quantification of the irreversibility rates of such radical concepts. Previous research on this topichas concentrated on the analysis of the turbojet and the turbofan engine. In the framework developed, the irreversibility rates are quantified through the calculation of the exergy destruction per unit time. A striking strength of the analysis is that it establishes a common currency for comparing losses originating from very different physical sources of irreversibility. This substantially reduces the complexity of analyzing and comparing losses in aero engines. In particular, the analysis sheds new light on how the intercooled recuperated engine establishes its performance benefits.
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| 6. |
- He, Yibo, et al.
(author)
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A subset of antibodies targeting citrullinated proteins confers protection from rheumatoid arthritis.
- 2023
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In: Nature communications. - : Springer Science and Business Media LLC. - 2041-1723. ; 14:1
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Journal article (peer-reviewed)abstract
- Although elevated levels of anti-citrullinated protein antibodies (ACPAs) are a hallmark of rheumatoid arthritis (RA), the in vivo functions of these antibodies remain unclear. Here, we have expressed monoclonal ACPAs derived from patients with RA, and analyzed their functions in mice, as well as their specificities. None of the ACPAs showed arthritogenicity nor induced pain-associated behavior in mice. However, one of the antibodies, clone E4, protected mice from antibody-induced arthritis. E4 showed a binding pattern restricted to skin, macrophages and dendritic cells in lymphoid tissue, and cartilage derived from mouse and human arthritic joints. Proteomic analysis confirmed that E4 strongly binds to macrophages and certainRA synovial fluid proteins such as α-enolase. The protective effect of E4 was epitope-specific and dependent on the interaction between E4-citrullinated α-enolase immune complexes with FCGR2B on macrophages, resulting in increased IL-10 secretion and reduced osteoclastogenesis. These findings suggest that a subset of ACPAs have therapeutic potential in RA.
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| 7. |
- Song, Kai, 1988-, et al.
(author)
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Improve the roles of nature reserves in conservation of endangered pheasant in a highly urbanized region
- 2020
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In: Scientific Reports. - : Springer Nature. - 2045-2322. ; 10:1
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Journal article (peer-reviewed)abstract
- Nature reserves play an extraordinarily important role in conserving animal populations and their habitats. However, landscape change and unreasonable zoning designations often render these protected areas inadequate. Therefore, regular evaluation of the efficacy of protected lands is critical for maintaining and improving management strategies. Using species distribution models and GAP analysis, we assessed the changes in suitable habitat for the Brown Eared-pheasant (Crossoptilon mantchuricum) in two Chinese nature reserves between 1995 and 2013. Our results showed that the habitat suitability of Brown Eared-pheasant has changed dramatically during this period, and fragmentation analyses showed an increase in concentration area and decrease in patch area. In particular, our findings show that the national nature reserves need to adjust their ranges to ensure the conservation of this flagship species. Our study further provides a new viewpoint for evaluating the efficacy of protected lands, particularly in highly urbanized regions where conservation goals must be balanced with changing landscapes.
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| 8. |
- Xu, Lei, 1988, et al.
(author)
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A Contra-rotating Variable Cycle Turbofan Engine
- 2009
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In: ISABE-2009-1161.
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Conference paper (peer-reviewed)abstract
- In a variable core flow engine, the corrected mass flow canbe adjusted according to the flight conditions. The thermal efficiency can then be improved by decouplingthe unfavorable relation between pressure ratio and corrected mass flow that exists in conventionalturbofan engines. An innovative variable core flow engine using a statorless turbine and a variable inlet guide vane (VIGV) is investigated. The performance of the important components is studied and the working principle of theengine system is analyzed. The effects of this configuration on engine fuel consumption and weightare studied. The use of a contrarotating variable cycle turbofan is discussed in the light of theconclusions drawn from the statorless configuration.
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| 9. |
- Xu, Lei, 1988
(author)
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Analysis and Evaluation of Innovative Aero Engine Core Concepts
- 2011
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Doctoral thesis (other academic/artistic)abstract
- Turbofan engines, which power the majority of the modern aircraft today, have achieved such a high maturity that small improvements of the engine performance requires a large investment. More innovative technologies, including those related to the engine cores, become increasinglyattractive due to the high fuel price in recent years as well as the strict regulations on emissions. In this thesis three different innovative core concepts based on alternative cycles are analysed. The first requires introducing an intercooler into a high bypass ratio engine. Intercooling can reduce the high pressure compressor exit temperature and enables a very high overallpressure ratio and thus also high thermal efficiency. The second innovative concept is the intercooled recuperated core. Recuperation can recover energy from the exhausts and improve the engine thermal efficiency. The third innovative concept makes use of a variable core cycle.By adopting a variable core cycle, one can keep the thermal efficiency at a relatively high level during cruise conditions. To analyse and evaluatethese concepts, the performance, dimensions and weight of the relevant components have been modelled with empirical correlations, industrial input and with CAD/CFD tools. These component models were integrated into system simulation tools and multidisciplinary optimisationstudies were carried out to explore the design space. The potential of the innovative core concepts are evaluated and they demonstrate fuel reduction potential to a varying degree. The complicated interrelationship between the design parameters of these engineshas also been analysed. Furthermore, it was found that modification of the engine gas path is necessary due to the influence from the new components. The knowledge accumulated in this thesis helps the engine designers enhance the understanding of these new concepts andselect a better approach for future air transport.
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| 10. |
- Xu, Lei, 1988, et al.
(author)
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Analysis of an Intercooled Recuperated Aero-engine
- 2011
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In: ISABE 2011 Proceedings, ISABE-2011-1318.
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Conference paper (peer-reviewed)abstract
- The multi-disciplinary tool TERA2020 is employed to explore the design space of the Intercooled Recuperated Aero-engine being studied in the NEWAC project. To have a better understanding of the design space, a parametric analysis was conducted. This allows selecting of an engine close to optimal performance. Within the constraints, a 4.61% of fuel saving was observed compared to the baseline engine.
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