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667 results on '"Liu, Liqiang"'

1. Review of Cloud Service Composition for Intelligent Manufacturing

Author

Li, Cuixia, Liu, Liqiang, and Shi, Li

Subjects
Computer Science - Artificial Intelligence
Abstract

Intelligent manufacturing is a new model that uses advanced technologies such as the Internet of Things, big data, and artificial intelligence to improve the efficiency and quality of manufacturing production. As an important support to promote the transformation and upgrading of the manufacturing industry, cloud service optimization has received the attention of researchers. In recent years, remarkable research results have been achieved in this field. For the sustainability of intelligent manufacturing platforms, in this paper we summarize the process of cloud service optimization for intelligent manufacturing. Further, to address the problems of dispersed optimization indicators and nonuniform/unstandardized definitions in the existing research, 11 optimization indicators that take into account three-party participant subjects are defined from the urgent requirements of the sustainable development of intelligent manufacturing platforms. Next, service optimization algorithms are classified into two categories, heuristic and reinforcement learning. After comparing the two categories, the current key techniques of service optimization are targeted. Finally, research hotspots and future research trends of service optimization are summarized.

Published
2024

5. On Deterministically Approximating Total Variation Distance

Author

Feng, Weiming, Liu, Liqiang, and Liu, Tianren

Subjects
Computer Science - Data Structures and Algorithms, Mathematics - Probability
Abstract

Total variation distance (TV distance) is an important measure for the difference between two distributions. Recently, there has been progress in approximating the TV distance between product distributions: a deterministic algorithm for a restricted class of product distributions (Bhattacharyya, Gayen, Meel, Myrisiotis, Pavan and Vinodchandran 2023) and a randomized algorithm for general product distributions (Feng, Guo, Jerrum and Wang 2023). We give a deterministic fully polynomial-time approximation algorithm (FPTAS) for the TV distance between product distributions. Given two product distributions $\mathbb{P}$ and $\mathbb{Q}$ over $[q]^n$, our algorithm approximates their TV distance with relative error $\varepsilon$ in time $O\bigl( \frac{qn^2}{\varepsilon} \log q \log \frac{n}{\varepsilon \Delta_{\text{TV}}(\mathbb{P},\mathbb{Q}) } \bigr)$. Our algorithm is built around two key concepts: 1) The likelihood ratio as a distribution, which captures sufficient information to compute the TV distance. 2) We introduce a metric between likelihood ratio distributions, called the minimum total variation distance. Our algorithm computes a sparsified likelihood ratio distribution that is close to the original one w.r.t. the new metric. The approximated TV distance can be computed from the sparsified likelihood ratio. Our technique also implies deterministic FPTAS for the TV distance between Markov chains.

Published
2023

9. Neural Radiation Fields via Accelerated and High Quality Parallel for Novel View Synthesis

Author

Liu, Liqiang, Yang, Lingling, Fu, Yanfang, Cai, Dongmei, Luo, Qianqing, Cao, Zijian, Goos, Gerhard, Series Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Huang, De-Shuang, editor, Pan, Yijie, editor, and Zhang, Qinhu, editor

Published
2024
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10. Study on VFAs production of sludge fermentation with the immobilization of lysozyme on Noria-PEI modified PVA carrier

Author

WANG Haolong, ZHANG Enze, WANG Zicheng, ZHAO Yuhan, NAN Jun, SUN Yanmin, MA Aijing, ZHOU Lishan, LIU Liqiang, CAI Xiang, and DUAN Xingyu

Subjects
noria, polyvinyl alcohol carrier, immobilized enzyme, residual sludge, volatile fatty acids, Environmental technology. Sanitary engineering, TD1-1066
Abstract

Sludge anaerobic digestion promoted by enzymes has the advantages of mild reaction, high efficiency and environmental protection etc. However, the difficulty of recovery and poor catalytic stability seriously restrict its application. Enzyme immobilization is the key to solve the above problems. A new type of polyvinyl alcohol(PVA) carrier was prepared by Noria and polyethylenimide(PEI) co-deposition. The effect of lysozyme immobilized with Noria-PEI modified PVA carriers on the efficiency of sludge anaerobic fermentation for VFAs production was studied. The results showed that immobilized lysozyme could enhance sludge fermentation to promote SCOD, and SCOD reached the highest concentration of 2 892.4 mg/L within 36 h, which was 3.4 times higher than in the blank(day 6). VFAs concentration peaked at 2 130.8 mg/L on day 4, mainly comprised of acetic acid and propionic acid, accounting for 61.8%-80.7%. The average particle size and specific surface area of sludge in the immobilized enzyme system were 42.957 μm and 0.413 m2/g, indicating that immobilized enzyme enhanced the hydrolysis of granular sludge. Microbial community analysis showed that the hydrolytic acid-producing phyla of Firmicutes, Proteobacteria and Bacteroides accounted for high proportion in the immobilized enzyme system. At the genus level, Macellibacteroides, Petrimona, Lactobacillu, and Clostridium_sensu_stricto_1 were the main genera, which revealed the mechanism of enhanced VFAs production by the immobilized enzyme at microscopic level.

Published
2024
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12. A Gaseous Time Projection Chamber with Micromegas Readout for Low Radioactive Material Screening

Author

Du, Haiyan, Du, Chengbo, Han, Ke, He, Shengming, Liu, Liqiang, Meng, Yue, Wang, Shaobo, Zhang, Tao, Zhang, Wenming, Zhao, Li, and Zhou, Jifang

Subjects
Physics - Instrumentation and Detectors
Abstract

Low radioactive material screening is becoming essential for rare event search experiments, such as neutrinoless double beta decay and dark matter searches in underground laboratories. A gaseous time projection chamber (TPC) can be used for such purposes with large active areas and high efficiency. A gaseous TPC with a Micromegas readout plane of approximately 20$\times$20 cm$^2$ is successfully constructed for surface alpha contamination measurements. We have characterized the energy resolution, gain stability, and tracking capability with calibration sources. With the unique track-related background suppression cuts of the gaseous TPC, we have established that the alpha background rate of the TPC is 0.13$\pm$0.03 $\mu$Bq/cm$^2$, comparable to the leading commercial solutions.

Published
2022

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