| 1. |
- Zhang, Zhuo, et al.
(författare)
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Iterative point-wise reinforcement learning for highly accurate indoor visible light positioning
- 2019
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Ingår i: Optics Express. - : OPTICAL SOC AMER. - 1094-4087 .- 1094-4087. ; 27:16, s. 22161-22172
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Tidskriftsartikel (refereegranskat)abstract
- Iterative point-wise reinforcement learning (IPWRL) is proposed for highly accurate indoor visible light positioning (VLP). By properly updating the height information in an iterative fashion, the IPWRL not only effectively mitigates the impact of non-deterministic noise but also exhibits excellent tolerance to deterministic errors caused by the inaccurate a priori height information. The principle of the IPWRL is explained, and the performance of the IPWRL is experimentally evaluated in a received signal strength (RSS) based VLP system and compared with other positioning algorithms, including the conventional RSS algorithm, the k-nearest neighbors (KNN) algorithm and the PWRL algorithm where iterations exclude. Unlike the supervised machine learning method, e.g., the KNN, whose performance is highly dependent on the training process, the proposed IPWRL does not require training and demonstrates robust positioning performance for the entire tested area. Experimental results also show that when a large height information mismatch occurs, the IPWRL is able to first correct the height information and then offers robust positioning results with a rather low positioning error, while the positioning errors caused by the other algorithms are significantly higher.
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| 2. |
- Liang, Jiamin, et al.
(författare)
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A phylogenetic framework of Palaearctic and Indomalayan Limacodidae (Lepidoptera, Zygaenoidea) based on sequence capture data
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Ingår i: Systematic Entomology. - 0307-6970.
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Tidskriftsartikel (refereegranskat)abstract
- The slug moth family Limacodidae is a cosmopolitan group of economic importance, but its higher level systematics remains poorly understood. Here, we present a robust, higher level phylogenetic framework for Palaearctic and Indomalayan members of the family using sequence capture data of 148 nuclear protein-coding and 13 mitochondrial markers from 145 samples of 126 species in 67 genera representing all five morphologically delineated limacodid lineages. Our results strongly support the monophyly of Limacodidae in which six major clades are recognized. The relationships among these clades are revealed, with Phrixolepia-clade being the most basal group followed by Apoda-clade, Euphlyctinides-clade, Cania-clade and Phlossa-clade + Parasa-clade, respectively. We also add publicly available DNA barcode sequences from additional species worldwide to this phylogenetic framework to infer the most completely sampled phylogeny of Limacodidae to date. Our work provides a major step towards understanding the systematics and evolution of slug moths.
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| 3. |
- Sun, Jinghao, et al.
(författare)
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On Computing Exact WCRT for DAG Tasks
- 2020
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Ingår i: 57th ACM/IEEE Design Automation Conference, DAC 2020, San Francisco, CA, USA, July 20-24, 2020. - : IEEE. - 9781728110851 ; , s. 1-6
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Konferensbidrag (refereegranskat)abstract
- Most current real-time parallel applications can be modeled as a directed acyclic graph (DAG) task. Existing worst-case response time (WCRT) bounds (e.g., Graham's bound) derived for DAGs may be very pessimistic. No one precisely knows the gap between the WCRT bound and the actual WCRT. In this paper, we aim to derive the exact WCRT of a DAG task under the list scheduling upon multi-core platforms. We encode the WCRT analysis problem into a satisfaction modular theoretical (SNIT) formulation based on insights into the list scheduling algorithm, and prove that our SMT program can solve the WCRT precisely, providing an accurate baseline to measure the tightness of the existing WCRT bounds. Experiments show that our method significantly improves the tightness of the WCRT bound, and is practically quite efficient, e.g., it can analyze DAGs with more than 40 vertices in a few seconds.
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| 4. |
- Zhang, Lixiu, et al.
(författare)
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Advances in the Application of Perovskite Materials
- 2023
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Ingår i: NANO-MICRO LETTERS. - : SHANGHAI JIAO TONG UNIV PRESS. - 2311-6706. ; 15:1
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Forskningsöversikt (refereegranskat)abstract
- Nowadays, the soar of photovoltaic performance of perovskite solar cells has set off a fever in the study of metal halide perovskite materials. The excellent optoelectronic properties and defect tolerance feature allow metal halide perovskite to be employed in a wide variety of applications. This article provides a holistic review over the current progress and future prospects of metal halide perovskite materials in representative promising applications, including traditional optoelectronic devices (solar cells, light-emitting diodes, photodetectors, lasers), and cutting-edge technologies in terms of neuromorphic devices (artificial synapses and memristors) and pressure-induced emission. This review highlights the fundamentals, the current progress and the remaining challenges for each application, aiming to provide a comprehensive overview of the development status and a navigation of future research for metal halide perovskite materials and devices.
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