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Special feature on computational photography

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Frontiers of Information Technology & Electronic Engineering 2017年第9期18卷 1205-1206页

作者： qiong-hai dai Tsinghua University Beijing 100084 China

Computational photography is an emerging field targeting for overcoming limitations of conventional photography, and holds great potential for building both new consumer cameras and scientific observa： tion instruments. At the convergence of multiple dis- ciplines, including computer vision, graphics, optics, and signal processing, computational photography has opened new frontiers in the past decade. Aca- demia and industry together witnessed a series of innovative and exciting progress.

关键词：计算机视觉传统摄影科学观测信号处理 ACA

Emerging theories and technologies on computational imaging

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Frontiers of Information Technology & Electronic Engineering 2017年第9期18卷 1207-1221页

作者： Xue-mei HU Jia-min WU Jin-li SUO qiong-hai dai Department of Automation Tsinghua University Beijing 100084 China Zhcjiang Future Technology Institute Jiaxing 314000 China

Computational imaging describes the whole imaging process from the perspective of light transport and information transmission, features traditional optical computing capabilities, and assists in breaking through the limitations of visual information recording. Progress in computational imaging promotes the development of diverse basic and applied disciplines. In this review, we provide an overview of the fundamental principles and methods in computational imaging, the history of this field, and the important roles that it plays in the development of science. We review the most recent and promising advances in computational imaging, from the perspective of different dimensions of visual signals, including spatial dimension, temporal dimension, angular dimension, spectral dimension, and phase. We also discuss some topics worth studying for future developments in computational imaging.

关键词： Computational imaging Multi-scale and multi-dimensional Super-resolution Femto-photography 3D reconstruction Hyperspectral imaging

Causal associations between intermediate very-low-density lipoprotein cholesterol-to-total lipids ratio and peptic ulcer:A bidirectional Mendelian randomization study

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World Journal of Clinical Cases 2024年第25期12卷 5729-5738页

作者： Chun-Mei Lin Qian Meng Ying-Jun Li Shuang-Xi Zhang qiong-Xi Luo Zhen-Yu dai Postgraduate Student Guangzhou University of Chinese MedicineGuangzhou 510006Guangdong ProvinceChina Department of Gastroenterology Guangzhou University of Chinese Medicine Shunde HospitalFoshan 528300Guangdong ProvinceChina

BACKGROUND Previous epidemiologic investigations have consistently demonstrated a strong association between the ratio of cholesterol to total lipids in medium very-lowdensity lipoprotein(VLDL)and the occurrence of peptic ulcers(PU).However,the precise causal relationship between these factors remains ***,this study aims to elucidate the potential correlation between the ratio of cholesterol to total lipids in medium VLDL and the incidence of peptic *** To investigate the ratio of cholesterol to total lipids in medium very-low-density lipoprotein(VLDL)association with PU via genetic methods,guiding future clinical *** Genome-wide association study(GWAS)datasets for the ratio of cholesterol to total lipids in intermediate VLDL and peptic ulcer were retrieved from the IEU OpenGWAS project(https://***).For the forward Mendelian randomization(MR)analysis,72 single nucleotide polymorphisms(SNPs)were identified as instrumental *** SNPs were selected based on their association with the ratio of cholesterol to total lipids in intermediate VLDL,with peptic ulcer as the outcome ***,for the inverse MR analysis,no SNPs were identified with peptic ulcer as the exposure variable and the ratio of cholesterol to total lipids in intermediate VLDL as the *** MR analyses utilized inverse variance weighted(IVW)as the primary analytical ***,weighted median and MR-Egger methods were employed as supplementary analytical approaches to assess causal *** regression was used as a supplementary method to evaluate potential directional *** and multiplicity tests were conducted using the leave-one-out method to evaluate result stability and mitigate biases associated with multiple *** The genetically predicted ratio of cholesterol to total lipids in medium VLDL was significantly associated with an elevated risk of peptic ulcer(IVW:OR=2.557,95%CI=1.274

关键词： Ratio of cholesterol to total lipids in medium VLDL Peptic ulcer Mendelian randomization Casual effect Single nucleotide polymorphism

Time allocation scheme in IEEE 802.15.3 TDMA mechanism

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第Z1期7卷 159-164页

作者： LIU Xin dai qiong-hai WU Qiu-feng Department of Automation Tsinghua University Beijing 100084 China Department of Automation Tsinghua University Beijing 100084 China Department of Automation Tsinghua University Beijing 100084 China

In network with a shared channel in TDMA mechanism, it is a core issue to effectively allocate channel time to provide service guarantees for flows with QoS requirements. This paper proposes a simple and efficient time allocation scheme called MES-ESRPT (MCTA at the End of Superframe-Enhanced Shortest Remaining Processing Time) for delay-sensitive VBR traffic in accordance with IEEE 802.15.3 standard. In this algorithm, PNC (piconet coordinator) allocates one MCTA (Management Channel Time Allocation) for each stream which is the process of communication at the end of superframe. During the MCTA period, each transmitter should report current fragments number of the first MSDU (MAC Service Data Unit) and the fragments number of the remainder MSDUs to PNC. In the next superframe, PNC firstly allocates part CTAs (Channel Time Allocation) for each stream based on the remainder fragments number of the first MSDU by SRPT rule, then allocates remainder CTAs for each stream based on all fragments number of remainder MSDUs by the same SRPT rule. Simulation results showed that our proposed MES-ESRPT method achieves significantly better performance in QoS for multimedia streams compared to the existing schemes.

关键词： Shortest remaining processing time (SRPT), MAC layer, TDMA, Quality of Service (QoS)

BulkTree: an overlay network architecture for live media streaming

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第Z1期7卷 125-130页

作者： GONG An DING Gui-guang dai qiong-hai LIN Chuang Department of Computer Science & Technology Tsinghua University Beijing 100084 China Broadband Networks & Digital Media Laboratory Department of Automation Tsinghua University Beijing 100084 China Broadband Networks & Digital Media Laboratory Department of Automation Tsinghua University Beijing 100084 China Department of Computer Science & Technology Tsinghua University Beijing 100084 China

Peer-to-peer (P2P) systems are now very popular. Current P2P systems are broadly of two kinds, structured and unstructured. The tree structured P2P systems used technologies such as distributed hash tables (DHT) and hierarchical clustering can search the required target quickly, however, in a tree, the internal node has a higher load and its leave or crash often causes a large population of its offspring's problems, so that in the highly dynamic Internet environment the tree structure may still suffer frequent breaks. On the other hand, most widely used unstructured P2P networks rely on central directory servers or massive message flooding, clearly not scalable. So, we consider both of the above systems' advantages and disadvantages and realize that in the P2P systems one node may fail easily, but that when a number of nodes organized as a set, which we call "super node", the set is robust. Super nodes can be created and updated aware of topology-aware, and used with simple protocol such as flooding or "servers" to exchange information. Furthermore the entire robust super node can be organized into exquisite tree structure. By using this overlay network architecture, P2P systems are robust, efficient, scalable and secure. The simulation results demonstrated that our architecture greatly reduces the alteration time of the structure while decreasing the average delay time, compared to the common tree structure.

关键词： Peer-to-peer (P2P), Overlay networks, Scalability, Live media, Distributed hash tables (DHT), Hierarchical clustering

Hg_(0.72)Cd_(0.28)Te扫描隧道谱的模型解释

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红外与毫米波学报 2024年第3期43卷 300-304页

作者：肖正琼戴昊光刘欣扬陈平平查访星上海大学理学院物理系上海200444 中国科学院上海技术物理研究所红外物理国家重点实验室上海200083

本工作利用截面扫描隧道显微镜(XSTM)研究了分子束外延生长的Hg_(0.72)Cd_(0.28)Te薄膜。扫描隧道谱(STS)测量表明,此碲镉汞材料的电流-电压(I/V)隧道谱呈现的零电流平台宽度(隧道谱表观带隙)比其实际材料带隙增大约130%,说明存在明显... 详细信息

本工作利用截面扫描隧道显微镜(XSTM)研究了分子束外延生长的Hg_(0.72)Cd_(0.28)Te薄膜。扫描隧道谱(STS)测量表明,此碲镉汞材料的电流-电压(I/V)隧道谱呈现的零电流平台宽度(隧道谱表观带隙)比其实际材料带隙增大约130%,说明存在明显的针尖诱导能带弯曲(TIBB)效应。扫描隧道谱三维TIBB模型计算发现低成像偏压测量时获取的I/V隧道谱数据与理论计算结果有令人满意的一致性。然而较大成像偏压时所计算的I/V谱与实验谱线在较大正偏压区域存在一定偏离。这是目前的TIBB模型未考虑带带隧穿、缺陷辅助隧穿等碲镉汞本身的输运机制对隧道电流的影响造成的。

关键词：扫描隧道显微镜扫描隧道谱 HgCdTe 针尖诱导能带弯曲

基于省级妇幼信息平台的“两癌”筛查系统设计与实现

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中国卫生信息管理杂志 2024年第2期21卷 228-233页

作者：李燊程凯戴琼湖北省妇幼保健院保健部湖北省武汉市430000

目的利用信息技术推进湖北省宫颈癌、乳腺癌筛查工作,提高筛查效率和质量。方法对宫颈癌、乳腺癌筛查的背景和需求进行综合分析,依托省级妇幼信息平台,建设湖北省宫颈癌、乳腺癌筛查信息系统。结果实现湖北省宫颈癌、乳腺癌筛查“筛—... 详细信息

目的利用信息技术推进湖北省宫颈癌、乳腺癌筛查工作,提高筛查效率和质量。方法对宫颈癌、乳腺癌筛查的背景和需求进行综合分析,依托省级妇幼信息平台,建设湖北省宫颈癌、乳腺癌筛查信息系统。结果实现湖北省宫颈癌、乳腺癌筛查“筛—查—管—治—救”全流程信息的闭环管理,规范筛查工作流程,实现基本信息和检查数据的共享,减轻基层工作人员负担,提升管理效率和服务质量。结论结合省级妇幼信息平台,将信息技术引入业务和管理流程,能够较好地满足筛查工作的管理和服务需求,具有较好的应用效果。

关键词：宫颈癌乳腺癌筛查信息化

从理想到实现:地方院校师范生优秀学业表现的生成机制

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黑龙江高教研究 2024年第2期42卷 130-136页

作者：罗家才朱代琼王彦才韶关学院广东韶关512005

学业表现是评价师范生培养质量的重要指标,探讨师范生优秀学业表现生成的内在机理对师范教育高质量发展具有重要参考价值。通过扎根理论分析发现,学业目标计划与牵引是地方院校师范生优秀学业表现生成的“灯塔”与动力源,决定学习韧性;... 详细信息

学业表现是评价师范生培养质量的重要指标,探讨师范生优秀学业表现生成的内在机理对师范教育高质量发展具有重要参考价值。通过扎根理论分析发现,学业目标计划与牵引是地方院校师范生优秀学业表现生成的“灯塔”与动力源,决定学习韧性;立志个人力与场域力是驱使师范生确立学业目标的关键因素;学习体验与自我认知让学生选择挑战性或者量力性学业目标;学习韧性、调适与支持策略是优秀学业表现生成的前提和保障;学业表现、调适与支持策略、学习体验与自我认知能够调节学习韧性,与其存在交互关系,学业表现反作用于学习体验与自我认知。为此,应通过完善“三全育人”体系增强师范生“立志”教育效能;以“分布式教育”强化教师职业信念与师范专业认同;创设多元发展平台延展师范生兴趣与能力认知空间;建构分类评价体系提升师范生获得感与学习效能感;采取学业援助与个性化指导提升师范生学习策略水平。

关键词：师范生优秀学业表现地方院校

Chimera dynamics in nonlocally coupled moving phase oscillators

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Frontiers of physics 2019年第4期14卷 109-116页

作者： Wen-Hao Wang qiong-Lin dai Hong-Yan Cheng hai-Hong Li Jun-Zhong Yang School of Science Beijing University of Posts and Telecommunications Beijing 100876 China

Chimera states,a symmetry-breaking spatiotemporal pattern in nonlocally coupled dynamical units,prevail in a variety of ***,the interaction structures among oscillators are static in most of studies on chimera *** this work,we consider a population of *** agent carries a phase *** assume that agents perform Brownian motions on a ring and interact with each other with a kernel function dependent on the distance between *** agents are motionless,the model allows for several dynamical states including two different chimera states (the type-Ⅰ and the type-Ⅱ chimeras).The movement of agents changes the relative positions among them and produces perpetual noise to impact on the model *** find that the response of the coupled phase oscillators to the movement of agents depends on both the phase lag α,determining the stabilities of chimera states,and the agent mobility *** low mobility,the synchronous state transits to the type-Ⅰ chimera state for α close to π/2 and attracts other initial states *** intermediate mobility,the coupled oscillators randomly jump among different dynamical states and the jump dynamics depends on α.We investigate the statistical properties in these different dynamical regimes and present the scaling laws between the transient time and the mobility for low mobility and relations between the mean lifetimes of different dynamical states and the mobility for intermediate mobility.

关键词： chimera states Brownian motion nonlocal coupling phase oscillators