检索结果-南通市图书馆

Science China(Information Sciences) 2024年第11期67卷 354-356页

作者： baoquan chen Zhouchen LIN Peng XI Yebin LIU Xiaodian chen School of Intelligence Science and Technology Peking University College of Future Technology Peking University Department of Automation Tsinghua University National Astronomical Observatories Chinese Academy of Sciences

Imaging is the foundational tool for scientists to observe and understand the world. It has served as the basis for scientific discoveries over human history. In recent years, with the rapid advancement of artificial intelligence and computing technologies, a new interdisciplinary field, computational imaging, has emerged and developed. By jointly optimizing imaging hardware and processing algorithms, computational imaging continuously breaks through the physical limits of traditional imaging systems in aspects such as resolution,dimension, contrast, and throughput.

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Quasi-holography computational model for urban computing

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Visual Informatics 2019年第2期3卷 81-86页

作者： baoquan chen Qiong Zeng Zhanglin cheng Peking University China Shandong University China Shenzhen Institutes of Advanced Technology Chinese Academy of SciencesChina

Vast amounts of data are produced with the development of smart cities and urban computing *** data is often captured from multiple sensors,with heterogeneous structures and highly decentralized *** data representation and smart computational models are required for more complex tasks in urban *** dwell deeply on two fundamental questions—can we provide an integrated data representation for the whole cyber–physical–social system?And,can we provide an integrated framework to choose the appropriate data for understanding a specific urban event?A holography data representation and the quasi-holography computational model have been proposed to address these *** describe case studies using the quasi-holography computational model,and discuss further problems to solve regarding our model.

关键词： Holography model Urban data representation

MDISN:Learning multiscale deformed implicit fields from single images

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Visual Informatics 2022年第2期6卷 41-49页

作者： Yujie Wang Yixin Zhuang Yunzhe Liu baoquan chen Peking University China Shandong University China

We present a multiscale deformed implicit surface network(MDISN)to reconstruct 3D objects from single images by adapting the implicit surface of the target object from coarse to fine to the input *** basic idea is to optimize the implicit surface according to the change of consecutive feature maps from the input *** with multi-resolution feature maps,the implicit field is refined progressively,such that lower resolutions outline the main object components,and higher resolutions reveal fine-grained geometric *** better explore the changes in feature maps,we devise a simple field deformation module that receives two consecutive feature maps to refine the implicit field with finer geometric *** results on both synthetic and real-world datasets demonstrate the superiority of the proposed method compared to state-of-the-art methods.

关键词： Single-view 3D reconstruction Implicit neural representation Multiscale deformation

Group optimization for multi-attribute visual embedding

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Visual Informatics 2018年第3期2卷 181-189页

作者： Qiong Zeng Wenzheng chen Zhuo Han Mingyi Shi Yanir Kleiman Daniel Cohen-Or baoquan chen Yangyan Li School of Computer Science&Technology Shandong UniversityQingdaoChina Department of Computer Science University of TorontoTorontoCanada Viterbi School of Engineering University of Southern CaliforniaCAUnited States DNEG Visual Effects LondonUnited Kingdom School of Computer Science Tel Aviv UniversityTel AvivIsrael

Understanding semantic similarity among images is the core of a wide range of computer graphics and computer vision ***,the visual context of images is often ambiguous as images that can be perceived with emphasis on different *** this paper,we present a method for learning the semantic visual similarity among images,inferring their latent attributes and embedding them into multi-spaces corresponding to each latent *** consider the multi-embedding problem as an optimization function that evaluates the embedded distances with respect to qualitative crowdsourced *** key idea of our approach is to collect and embed qualitative pairwise tuples that share the same attributes in *** ensure similarity attribute sharing among multiple measures,image classification clusters are presented to,and solved by *** collected image clusters are then converted into groups of tuples,which are fed into our group optimization algorithm that jointly infers the attribute similarity and multi-attribute *** multi-attribute embedding allows retrieving similar objects in different attribute *** results show that our approach outperforms state-of-the-art multi-embedding approaches on various datasets,and demonstrate the usage of the multi-attribute embedding in image retrieval application.

关键词： Embedding Semantic similarity Visual retrieval

Synthesis and Antitumor Activities of 1,3,4-Thiadiazole Derivatives Possessing Benzisoselenazolone Scaffold

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Chemical Research in Chinese Universities 2014年第5期30卷 764-769页

作者： ZHAO Jie XUAN Lina ZHAO Haichuan chenG Ji FU Xiaoyun LI Sha JING Fen LIU Yuming chen baoquan School of Chemistry and Chemical Engineering Tianjin University of Technology Tianjin 300384 P. R. China

A series of novel 1,3,4-thiadiazole derivatives possessing benzisoselenazolone scaffold were designed and synthesized, and their antitumor activities against human cervix adenocarcinoma（HeLa）, human liver cancer cell（SMMC-7721）, human breast cancer cell（MCF-7） and human lung cancer cell（A549） lines were evaluated by CCK-8 assay, The bioassay results demonstrate that most of the tested compounds showed potent antiproliferative effects against various cell lines. Furthermore, compounds 7c, 7e, 7h, 7i and 7k showed significant antiproliferative activities against SMMC-7721 cells, with IC5o values of 2.38, 2.67, 1.35, 2.75 and 2.48 μmol/L, respectively. Com- pounds 7a, 7e, 7j and 71 exhibited highly effective antitumor activities against MCF-7 cells, with IC50 values of 2.89, 2.95, 1.12 and 2.75 μmol/L, respectively. Compound 7j was found to be the most potent compound against A549 cells, with an IC50 value of 1.25 μmol/L. The pharmacological results suggest that the substituents of benzylthio-moiety at position 2 on 1,3,4-thiadiazole are vital for modulating antitumor activities against various cancer cell lines.

关键词： 1,3,4-Thiadiazole derivative Benzisoselenazolone Antitumor activity

3D visual processing and reconstruction

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Virtual Reality & Intelligent Hardware 2020年第3期2卷 I0001-I0002页

作者： baoquan chen Peking University Beijing 100871China

3D sensing represents the main channel through which humans,or robotics agents,understand and interact with each other and with the real *** such,many 3D acquisition technologies and devices have been developed and applied in emerging applications,such as autonomous systems,augmented reality and digital production.A typical 3D visual system takes RGB and/or range images of an object or scene and generates 3D geometry.

关键词： visual autonomous processing

100 GHz silicon–organic hybrid modulator

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Light(Science & Applications) 2014年第1期3卷 196-199页

作者： Luca Alloatti Robert Palmer Sebastian Diebold Kai Philipp Pahl baoquan chen Raluca Dinu Maryse Fournier Jean-Marc Fedeli Thomas Zwick Wolfgang Freude Christian Koos Juerg Leuthold Institutes IPQ and IMT Karlsruhe Institute of Technology(KIT)76131 KarlsruheGermany Institute IHE Karlsruhe Institute of Technology(KIT)76131 KarlsruheGermany GigOptix Inc. BothellWAUSA CEA Leti38054 GrenobleFrance Institute of Photonic Systems Swiss Federal Institute of

Electro-optic modulation at frequencies of 100 GHz and beyond is important for photonic-electronic signal processing at the highest *** date,however,only a small number of devices exist that can operate up to this *** this study,we demonstrate that this frequency range can be addressed by nanophotonic,silicon-based *** exploit the ultrafast Pockels effect by using the silicon–organic hybrid(SOH)platform,which combines highly nonlinear organic molecules with silicon *** now,the bandwidth of these devices was limited by the losses of the radiofrequency(RF)signal and the RC(resistor-capacitor)time constant of the silicon *** RF losses are overcome by using a device as short as 500 μm,and the RC time constant is decreased by using a highly conductive electron accumulation layer and an improved gate *** this method,we demonstrate for the first time an integrated silicon modulator with a 3dB bandwidth at an operating frequency beyond 100 *** results clearly indicate that the RC time constant is not a fundamental speed limitation of SOH devices at these *** device has a voltage–length product of only V_(π)L=11 V mm,which compares favorably with the best silicon-photonic modulators available *** cladding materials with stronger nonlinearities,the voltage–length product is expected to improve by more than an order of magnitude.

关键词： 100GHz high-speed silicon modulator nanophotonics silicon–organic hybrid

Message from the Best Paper Award Committee

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Computational Visual Media 2024年第3期10卷 397-397页

作者： Ming C.Lin baoquan chen Ying He Wenping Wang Kun Zhou Ralph Martin Associate Editor-in-Chief University of Maryland at College Park USA 不详

Following the success of the past eight years,Tsinghua University Press has continued to sponsor an annual award for the best papers published in Computational Visual *** papers in 2023 from Computational Visual Media were recommended by Associate Editors as candidate papers for the Best Paper *** Editors-in-Chief Ming *** and Ralph Martin led the Best Paper Award Committee to select the Best *** careful deliberation,the following paper was chosen with the unanimous consensus as the winner.

关键词： Visual Award Message

锦屏一级高拱坝整体稳定物理与数值模拟综合分析

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水利学报 2017年第2期48卷 175-183页

作者：杨宝全张林陈媛陈建叶董建华四川大学水力学与山区河流开发保护国家重点实验室水利水电学院四川成都610065 诺丁汉大学诺丁汉岩土力学中心工程学院

高拱坝的整体稳定是工程建设中的关键问题之一,地质力学模型试验和数值计算是研究这一问题的重要方法。通过理论推导建立了基于综合法的大坝稳定安全系数评定关系式。针对锦屏一级高拱坝坝肩地质条件复杂,影响拱坝整体稳定的断层、岩脉... 详细信息

高拱坝的整体稳定是工程建设中的关键问题之一,地质力学模型试验和数值计算是研究这一问题的重要方法。通过理论推导建立了基于综合法的大坝稳定安全系数评定关系式。针对锦屏一级高拱坝坝肩地质条件复杂,影响拱坝整体稳定的断层、岩脉、节理裂隙众多,坝高库大和加固难度大,工程安全稳定问题十分突出等特点,采用综合法地质力学模型试验与三维非线性有限元相结合的方法,对加固处理后的锦屏一级高拱坝整体稳定性开展研究。获得了拱坝在正常工况下的工作性态,以及在结构面强度参数降低约30%后坝肩的超载变形失稳过程和最终破坏形态,提出拱坝与地基综合法整体稳定安全度为5.2~6.0(试验值)和5.98(计算值)。通过综合分析模型试验和数值计算的成果,评价了锦屏一级高拱坝工程的安全性和加固效果。研究成果为锦屏一级拱坝工程的安全监测和运行管理提供了科学依据,同时也为其他类似高拱坝工程的稳定分析提供参考。

关键词：高拱坝工程整体稳定性物理模拟数值计算综合分析

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面向数据可视化的色彩计算

计算机辅助设计与图形学学报 2020年第10期32卷 1549-1559页

作者：曾琼汪云海屠长河陈宝权山东大学计算机科学与技术学院青岛266000 北京大学前沿计算研究中心北京100871

色彩在数据可视化中发挥着重要作用,是人们读取数值、感知趋势、发现异常的关键视觉编码元素.然而,色彩设计过程需要较多人为干预,存在低效耗时、难以拓展且易产生色彩的误用、滥用等问题.近年来兴起的数据可视化评估理论为解决上述问... 详细信息

色彩在数据可视化中发挥着重要作用,是人们读取数值、感知趋势、发现异常的关键视觉编码元素.然而,色彩设计过程需要较多人为干预,存在低效耗时、难以拓展且易产生色彩的误用、滥用等问题.近年来兴起的数据可视化评估理论为解决上述问题提供了思路,即将色彩设计表达为在数据、用户、任务、设备等可视化应用环境下的最优决策.文中回顾了数据可视化领域色彩设计相关工作,主要包括色彩设计准则及其量化表达、自动色彩设计(色彩选择、色彩优化、色彩生成、色彩迁移)以及自适应色彩设计,论述了现有色彩计算研究对于探索智能化色彩设计的意义与启发,总结并分析了该领域未来发展趋势.

关键词：数据可视化色彩设计色彩计算