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479 results on '"Huang Huanhuan"'

23. Throughput and Delay Analysis of Slotted Aloha with Batch Service

Author

Huang, Huanhuan, Ye, Tong, and Lee, Tony T.

Subjects
Computer Science - Performance
Abstract

In this paper, we study the throughput and delay performances of the slotted Aloha with batch service, which has wide applications in random access networks. Different from the classical slotted Aloha, each node in the slotted Aloha with batch service can transmit up to M packets once it succeeds in channel competition. The throughput is substantially improved because up to M packets jointly undertake the overhead due to contention. In an innovative vacation model developed in this paper, we consider each batch of data transmission as a busy period of each node, and the process between two successive busy periods as a vacation period. We then formulate the number of arrivals during a vacation period in a renewal-type equation, which characterizes the dependency between busy periods and vacation periods. Based on this formulation, we derive the mean waiting time of a packet and the bounded delay region for the slotted Aloha with batch service. Our results indicate the throughput and delay performances are substantially improved with the increase of batch sizeM, and the bounded delay region is enlarged accordingly. As M goes to infinity, we find the saturated throughput can approach 100% of channel capacity, and the system remains stable irrespective of the population size and transmission probability.

Published
2019

29. Deep Reinforcement Learning with Two-Stage Training Strategy for Practical Electric Vehicle Routing Problem with Time Windows

Author

Chen, Jinbiao, Huang, Huanhuan, Zhang, Zizhen, Wang, Jiahai, Goos, Gerhard, Founding 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, Rudolph, Günter, editor, Kononova, Anna V., editor, Aguirre, Hernán, editor, Kerschke, Pascal, editor, Ochoa, Gabriela, editor, and Tušar, Tea, editor

Published
2022
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30. Extreme Learning Machine with Local Connections

Author

Li, Feng, Yang, Sibo, Huang, Huanhuan, and Wu, Wei

Subjects
Computer Science - Learning, Computer Science - Artificial Intelligence, Statistics - Machine Learning
Abstract

This paper is concerned with the sparsification of the input-hidden weights of ELM (Extreme Learning Machine). For ordinary feedforward neural networks, the sparsification is usually done by introducing certain regularization technique into the learning process of the network. But this strategy can not be applied for ELM, since the input-hidden weights of ELM are supposed to be randomly chosen rather than to be learned. To this end, we propose a modified ELM, called ELM-LC (ELM with local connections), which is designed for the sparsification of the input-hidden weights as follows: The hidden nodes and the input nodes are divided respectively into several corresponding groups, and an input node group is fully connected with its corresponding hidden node group, but is not connected with any other hidden node group. As in the usual ELM, the hidden-input weights are randomly given, and the hidden-output weights are obtained through a least square learning. In the numerical simulations on some benchmark problems, the new ELM-CL behaves better than the traditional ELM.

Published
2018

33. Optimum Transmission Window for EPONs with Gated-Limited Service

Author

Huang, Huanhuan, Ye, Tong, Lee, Tony T., and Hu, Weisheng

Subjects
Computer Science - Networking and Internet Architecture, Computer Science - Performance
Abstract

This paper studies the Ethernet Passive Optical Network (EPON) with gated-limited service. The transmission window (TW) is limited in this system to guaranteeing a bounded delay experienced by disciplined users, and to constrain malicious users from monopolizing the transmission channel. Thus, selecting an appropriate TW size is critical to the performance of EPON with gated-limited service discipline. To investigate the impact of TW size on packet delay, we derive a generalized mean waiting time formula for M/G/1 queue with vacation times and gated-limited service discipline. A distinguished feature of this model is that there are two queues in the buffer of each optical network unit (ONU): one queue is inside the gate and the other one is outside the gate. Furthermore, based on the Chernoff bound of queue length, we provide a simple rule to determine an optimum TW size for gated-limited service EPONs. Analytic results reported in this paper are all verified by simulations., Comment: 14 pages, 10 figures, IEEE transaction on networking

Published
2017

40. The relationships between quality of life with health literacy, social support and resilience in older stroke survivors: A structural equation model.

Author

Chen, Mei, Li, Jinghong, Chen, Chunyan, Zhao, Qinghua, and Huang, Huanhuan

Subjects
HEALTH literacy, PSYCHOLOGICAL resilience, CROSS-sectional method, PEARSON correlation (Statistics), RESEARCH funding, GERIATRIC nursing, QUESTIONNAIRES, STRUCTURAL equation modeling, CHI-squared test, DESCRIPTIVE statistics, QUALITY of life, SOCIAL support, STROKE patients, DATA analysis software
Abstract

Aim: To the determinants and the underlying mechanism of health literacy, social support, and resilience on the health‐related quality of life (HRQoL) among older stroke survivors. Design: A cross‐sectional design was applied at four comprehensive hospitals in Chongqing via convenience sampling from January 2020 to June 2021. Methods: Health literacy, social support, and resilience were designed as independent variables, and HRQoL was measured as a dependent variable. Structural equation modelling with the bootstrap method was used to test the hypotheses. Results: The theoretically derived model exhibited a good fit (χ2/df ratio = 2.830, GFI = 0.987, CFI = 0.978, RMSEA = 0.066). Health literacy (β = 0.12, p < 0.05) and social support (β = 0.14, p < 0.05) directly affect HRQoL. Resilience (β = 0.40, p < 0.01) also mediated the relationship between health literacy, social support, and HRQoL. The three variables explaining 29.0% of HRQoL variance. Patient or Public Contribution: There was no direct patient or public involvement in the design, conduct, or reporting of this study. Participants were recruited through convenience sampling from four comprehensive hospitals in Chongqing, and their perspectives or contributions were not explicitly sought. The study focused on examining the determinants and underlying mechanism of health literacy, social support, and resilience on the health‐related quality of life among older stroke survivors. Nonetheless, the findings of this research may inform the development of interventions aimed at improving the health‐related quality of life in post‐stroke older patients. [ABSTRACT FROM AUTHOR]

Published
2024
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