| 1. |
- Yang, Ying, et al.
(författare)
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Harnessing the power of Machine learning for AIS Data-Driven maritime Research: A comprehensive review
- 2024
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Ingår i: Transportation Research Part E: Logistics and Transportation Review. - 1366-5545. ; 183
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Tidskriftsartikel (refereegranskat)abstract
- Automatic Identification System (AIS) data holds immense research value in the maritime industry because of its massive scale and the ability to reveal the spatial–temporal variation patterns of vessels. Unfortunately, its potential has long been limited by traditional methodologies. The emergence of machine learning (ML) offers a promising avenue to unlock the full potential of AIS data. In recent years, there has been a growing interest among researchers in leveraging ML to analyze and utilize AIS data. This paper, therefore, provides a comprehensive review of ML applications using AIS data and offers valuable suggestions for future research, such as constructing benchmark AIS datasets, exploring more deep learning (DL) and deep reinforcement learning (DRL) applications on AIS-based studies, and developing large-scale ML models trained by AIS data.
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| 2. |
- Zhang, Guoqing, et al.
(författare)
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Extensive and drastically different alpine lake changes on Asia's high plateaus during the past four decades
- 2017
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Ingår i: Geophysical Research Letters. - 0094-8276. ; 44:1, s. 252-260
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Tidskriftsartikel (refereegranskat)abstract
- Asia's high plateaus are sensitive to climate change and have been experiencing rapid warming over the past few decades. We found 99 new lakes and extensive lake expansion on the Tibetan Plateau during the last four decades, 1970–2013, due to increased precipitation and cryospheric contributions to its water balance. This contrasts with disappearing lakes and drastic shrinkage of lake areas on the adjacent Mongolian Plateau: 208 lakes disappeared and 75% of the remaining lakes have shrunk. We detected a statistically significant coincidental timing of lake area changes in both plateaus, associated with the climate regime shift that occurred during 1997/1998. This distinct change in 1997/1998 is thought to be driven by large-scale atmospheric circulation changes in response to climate warming. Our findings reveal that these two adjacent plateaus have been changing in opposite directions in response to climate change. These findings shed light on the complex role of the regional climate and water cycles, and provide useful information for ecological and water resource planning in these fragile landscapes.
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| 3. |
- Morris, Simon, et al.
(författare)
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The ELT-MOS (MOSAIC) : towards the construction phase
- 2018
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Ingår i: GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY VII. - : SPIE-INT SOC OPTICAL ENGINEERING. - 9781510619586 ; 10702
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Konferensbidrag (refereegranskat)abstract
- When combined with the huge collecting area of the ELT, MOSAIC will be the most effective and flexible Multi-Object Spectrograph (MOS) facility in the world, having both a high multiplex and a multi-Integral Field Unit (Multi-IFU) capability. It will be the fastest way to spectroscopically follow-up the faintest sources, probing the reionisation epoch, as well as evaluating the evolution of the dwarf mass function over most of the age of the Universe. MOSAIC will be world-leading in generating an inventory of both the dark matter (from realistic rotation curves with MOAO fed NIR IFUs) and the cool to warm-hot gas phases in z=3.5 galactic haloes (with visible wavelenth IFUs). Galactic archaeology and the first massive black holes are additional targets for which MOSAIC will also be revolutionary. MOAO and accurate sky subtraction with fibres have now been demonstrated on sky, removing all low Technical Readiness Level (TRL) items from the instrument. A prompt implementation of MOSAIC is feasible, and indeed could increase the robustness and reduce risk on the ELT, since it does not require diffraction limited adaptive optics performance. Science programmes and survey strategies are currently being investigated by the Consortium, which is also hoping to welcome a few new partners in the next two years.
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| 4. |
- Xu, Dequan, et al.
(författare)
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Inlet layout effects on the mixing performance with a novel mixing evaluation in a powder-fueled ramjet
- 2022
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Ingår i: Fuel. - : Elsevier BV. - 0016-2361. ; 327
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Tidskriftsartikel (refereegranskat)abstract
- Mixing process is crucial for ignition and combustion in powder-fueled ramjets. The mixing performance depends mainly on the inlet layout. In this study, the effects of four popular inlet layouts were investigated and were found to significantly influence the particle distribution. In this study, the Savitzky-Golay approach was used to handle large amounts of data on particles to obtain clear peaks and smooth curves. A novel mixing evaluation method was proposed for exploring the mixing enhancement mechanism further. The mixing performance analysis in the X-direction was conducted using the mixing quality index. The four-inlets scheme has similar mixing quality with the two-inlets scheme with an inlet angle of 180°, and higher than the others. The qualitative and quantitative evaluations in the Y- and Z-directions were conducted using the percent frequency and the Kullback-Leibler divergence. The Kullback-Leibler divergence of the four-inlets scheme was more than 29.9% lower than the others. However, a considerable momentum loss and travelling time through entire turbulent eddy cannot be prevented in this scheme.
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