82 research outputs found
Na'an cong gao /
No full textNa'an cang ben.Each work has special t.p.Double leaves, oriental style, in case.Blockprint.Mode of access: Internet
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Dynamics of Advice Network and Knowledge Contribution: A Longitudinal Social Network Analysis
No full textOnline communities have become an increasingly popular channel for social interaction, enabling knowledge and opinion sharing across a board range of topics and contexts. Their viability and sustainability depends largely on contributions from community members in terms of time, resources, and knowledge. However, how individuals' knowledge contribution behavior changes over time and what network structural characteristics influence individuals' contribution behavior is not well understood. This study investigates "co-evolution" of social networks (i.e. advice network) and knowledge contribution behavior thorough a lens of social selection and social influence mechanism. This study are particularly interested in examining the dynamics of the advice network ties and the knowledge contribution behavior in the context of virtual financial communities in which people voluntarily participate to exchanges investing-related information. Unlike popular friendship-based online social networks, virtual financial communities in this study enables members to construct their own advice network by adding, maintaining, or terminating advice ties. Changes in network ties are referred to as social selection, while changes in individuals' behavior in response to the current network position are referred to as social influence. Dynamic network modeling is applied to investigate effects of social selection and influence separately and then examine the interplay between social selection and behavioral influence. Examination of such effects both separately and simultaneously requires a longitudinal data that capture dynamic changes in both the advice ties and the behavior under study.Release after 09-Aug-2014Originally embargoed until 09-Aug-2014; further restricted on 22-Jan-2016 per author request / K
Amaurodera smetanai Pace
No full textAmaurodera smetanai Pace Figs 2 B, 6 Amaurodera smetanai Pace, 1992: 129. Material examined. 3 ♂♂, 1 ♀, 4 sex? labeled ‘ CHINA: Hainan Province, Wuzhishan, Mt. Reservior Road, 18 ° 53 ’N, 109 ° 36 ’E, alt. 650–700 m, 21 -IV- 2012, Zhong Peng & Cong-Cao Dai leg’. 2 ♂♂, 1 ♀, 5 sex? labeled ‘ CHINA: Hainan Province, Wuzhishan, Mt. 18 ° 54 ’N, 109 ° 41 ’E, alt. 700–1300 m, 18 -IV- 2012, Zi-Wei Yin leg’. 14 sex?: same labeled as above-mentioned, but the date of these specimens is 19 -IV- 2012 or 20 -IV- 2012. 1 sex?: labeled ‘ CHINA: Hainan Province, Jianfengling N. R., Mingfeng Gu Valley, 18 ° 44 ’N, 108 ° 50 ’E, alt. 950 m, 29 - IV- 2012, Zhong Peng & Cong-Cao Dai leg’. 3 sex?: labeled ‘ CHINA: Hainan Province, Jianfengling N. R., No. 5 Region, 18 ° 44 ’N, 108 ° 50 ’E, alt. 900 m, 02-V- 2012, Yu-Hong Pan & Zi-Wei Yin leg’. Measurements. BL: 3.73–4.28; FBL: 2.01–2.20; HW: 0.61–0.65; PL: 0.87–0.97; PW: 0.58–0.65; EL: 0.74–0.81; EW: 0.63–0.76; SL: 0.47–0.54. Comments. This species (Figs 2 B, 6) was originally described from Nepal, it is newly recorded in Hainan, southern China.Published as part of Yan, Zhu-Qi & Li, Li-Zhen, 2015, New species and additional records of Amaurodera Fauvel in southern China (Coleoptera, Staphylinidae, Aleocharinae), pp. 272-278 in Zootaxa 3931 (2) on pages 276-277, DOI: 10.11646/zootaxa.3931.2.6, http://zenodo.org/record/23252
A 2-stage vision-based localization methodology for efficient automatic charging of electric vehicles in uncertain environments
No full textData availability statement:
The data that support the findings of this study are available from the corresponding author upon reasonable request.Automatic visual localization of electric vehicle (EV) charging ports presents significant challenges in uncertain environments, such as varying surface textures, reflections, lighting and observation distance. Existing methods require extensive real-world training data and well-focused images to achieve robust and accurate localization. However, both requirements are difficult to meet under variable and unpredictable conditions. This paper proposes a 2-stage vision-based localization approach. Firstly, the image synthesis technique is used to reduce the cost of real-world data collection. A task-oriented parameterization protocol (TOPP) is proposed to optimize the quality of the synthetic images. Secondly, an autofocus and servoing strategy is proposed. A hybrid detector is employed to enhance sharpness assessment performance, while a visual servoing method based on single exponential smoothing (SES) is developed to enhance stability and efficiency during the search process. Experiments were conducted to evaluate image synthesis efficiency, detection accuracy, and servoing performance. The proposed method achieved 99% detection accuracy on the real-world port images, and guided the robot to the optimal imaging position within 16 s, outperforming comparable approaches. These results highlight its potential for robust automated charging in real-world scenarios.Funding Research supported by the State Key Laboratory of Digital Manufacturing Equipment and Technology, Grant No. DMETKF2021018. GJYC program of GuangZhou, Grant ID. 2024D03J0005. Chunhui Project Foundation of the Education Department of China, Grant No. 202201789
Spectral compression of chirp-free optical pulses in fibers with exponentially increasing dispersion
No full textWe numerically demonstrate high-degree spectral compression of chirp-free optical pulses in fibers with exponentially increasing dispersion. The spectral compression factor and brightness-enhanced factor can exceed 10, and the suggested fiber is a 0.8 km dispersion exponentially increasing fiber. We find that the input pulses finally evolve into the self-similar soliton as they propagate in the fiber. The pulse chirp is generated, although the input pulse is chirp-free, and the detailed evolution of the chirp parameter is discussed. The exponentially increasing dispersion has enabled the efficient spectral compression, and some key parameters such as the initial pulse width, initial dispersion value, and dispersion exponentially increasing rate also affect the spectral compression process for the hyperbolic secant and Gaussian input pulses. Wavelength tunability and effect of third-order dispersion also are discussed. We further provide a comparison between the numerical results from the generalized nonlinear Schrodinger equation and pulse parameter equations. (C) 2017 Optical Society of AmericaNational Natural Science Foundation of China (NSFC) [61675008]SCI(E)ARTICLE91796-18043
Identifiability and estimation of probabilities from multiple databases with incomplete data and sampling selection
No full textFor an application problem, there may be multiple databases, and each database may not contain complete variables or attributes, that is, some variables are observed but some others are missing. Further, data of a database may be collected conditionally on some designed variables. In this paper, we discuss problems related to data mining from such multiple databases. We propose an approach for detecting identifiability of a joint distribution from multiple databases. For an identifiable joint distribution, we further present the expectation-maximization (EM) algorithm for calculating the maximum likelihood estimates (MLEs) of the joint distribution.Computer Science, Artificial IntelligenceComputer Science, Theory & MethodsSCI(E)CPCI-S(ISTP)
Application of waveform inversion with prior geologic imformation in dolomite reservoir characterization: A case study in southwest area of Sichuan Basin
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