176 research outputs found

    Topology dictionary with Markov model for 3D video content-based skimming and description

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    This paper presents a novel approach to skim and de-scribe 3D videos. 3D video is an imaging technology which consists in a stream of 3D models in motion captured by a synchronized set of video cameras. Each frame is composed of one or several 3D models, and therefore the acquisition of long sequences at video rate requires massive storage de-vices. In order to reduce the storage cost while keeping rele-vant information, we propose to encode 3D video sequences using a topology-based shape descriptor dictionary. This dictionary is either generated from a set of extracted pat-terns or learned from training input sequences with seman-tic annotations. It relies on an unsupervised 3D shape-based clustering of the dataset by Reeb graphs, and features a Markov network to characterize topological changes. The approach allows content-based compression and skimming with accurate recovery of sequences and can handle com-plex topological changes. Redundancies are detected and skipped based on a probabilistic discrimination process. Semantic description of video sequences is then automat-ically performed. In addition, forthcoming frame encoding is achieved using a multiresolution matching scheme and allows action recognition in 3D. Our experiments were per-formed on complex 3D video sequences. We demonstrate the robustness and accuracy of the 3D video skimming with dramatic low bitrate coding and high compression ratio. 1

    Cross-Strait Relations and Regional Integration: A Review of the Ma Ying-jeou Era (2008-2016)

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    Despite the signing of the Economic Cooperation Framework Agreement (ECFA) between mainland China and Taiwan in 2010, Taiwan’s future status in the field of Asian regional integration remains unclear. While Taiwan remains outside the Trans-Pacific Partnership (TPP) and the Regional Comprehensive Economic Partnership (RCEP), China’s rise and continued expansion in regional integration put increasing pressure on Taiwan to confront its political differences with China. This paper discusses the interconnection between regional integration and cross-Strait relations and seeks to address the implications such linkage entails. The authors note the exploitation of a two-pronged strategy by Beijing to pressure Taibei into confronting the political problem between China and Taiwan. In addition, the authors assess Taiwan’s performance in terms of its progress in the establishment of preferential trade agreements (PTAs) from 2008 to 2016 under the Ma Ying-jeou (Ma Yingjiu) administration and identify the hurdles and prospects for Taiwan’s future integration efforts. This paper concludes with a brief consideration of Taiwan’s New Southward Policy

    A case study: patient-centered hospital design

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    Health care is a dynamic industry constantly shaped by external factors such as governmental regulations, competitions, and consumer trends. Today, as health care consumers become more informed and engaged in their medical care than ever before, health care organizations are focusing on improving the patient experience. Allegheny Health Network, a multi-hospital health system, is currently building a 160-bed hospital in Wexford, Pennsylvania to provide patient-centered care to their communities. The patient-centered design of Wexford Hospital includes a variety of unique facility and technology features such as the rooftop garden, smart television, mobile app, and patient room control. The purpose of this paper is to evaluate the patient-centered design of Wexford Hospital by comparing the various features as well as the workflow design to 8 different dimensions of patient-centered care. Overall, the Wexford Hospital design addresses all the dimensions and provides a patient-centered experience from arrival to discharge. PUBLIC HEALTH RELEVANCE In relation to health care, one of the major focuses of public health is the Triple Aim. It is part of the national strategy for addressing the health care issues of population health, experience of care, and per capital cost. Patient-centered care is an evidence-based approach to health care that aligns with the Triple Aim by improving the experience of care and reducing costs

    A study of mechanics of triaxial fabrics

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    M.S.W. Denney Freeston, Jr

    3D video performance segmentation

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    We present a novel approach that achieves segmentation of subject body parts in 3D videos. 3D video consists in a free-viewpoint video of real-world subjects in motion immersed in a virtual world. Each 3D video frame is composed of one or several 3D models. A topology dictionary is used to cluster 3D video sequences with respect to the model topology and shape. The topology is characterized using Reeb graph-based descriptors and no prior explicit model on the subject shape is necessary to perform the clustering process. In this frame-work, the dictionary consists in a set of training input poses with a priori segmentation and labels. As a consequence, all identified frames of 3D video sequences can be automatically segmented. Finally, motion flows computed between consec-utive frames are used to transfer segmented region labels to unidentified frames. Our method allows us to perform robust body part segmentation and tracking in 3D cinema sequences. Index Terms — 3D video, topology dictionary, shape matching, body segmentation 1

    VIVE3D: Viewpoint-Independent Video Editing using 3D-Aware GANs

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    We introduce VIVE3D, a novel approach that extends the capabilities of image-based 3D GANs to video editing and is able to represent the input video in an identity-preserving and temporally consistent way. We propose two new building blocks. First, we introduce a novel GAN inversion technique specifically tailored to 3D GANs by jointly embedding multiple frames and optimizing for the camera parameters. Second, besides traditional semantic face edits (e.g. for age and expression), we are the first to demonstrate edits that show novel views of the head enabled by the inherent properties of 3D GANs and our optical flow-guided compositing technique to combine the head with the background video. Our experiments demonstrate that VIVE3D generates high-fidelity face edits at consistent quality from a range of camera viewpoints which are composited with the original video in a temporally and spatially consistent manner.Comment: CVPR 2023. Project webpage and video available at http://afruehstueck.github.io/vive3

    NMR structural studies of mismatched DNA base pairs and their interaction with E. coli MutS protein

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    Escherichia coli MutS is a DNA binding repair protein (97 kDa, monomer) and its biological significance arises from its recognition of mismatches which occur as errors during DNA replication. Mismatches and mutagenic bases represent a fascinating and diverse range of shapes and sizes and it is not obvious how a single protein (MutS) can recognise such molecular diversity against a huge background of canonical Watson-Crick base pairs. In this project, the structure of a 17mer mismatch GT DNA was carried out using NMR spectroscopy to identify the differences caused by the introduction of a non-canonical base pair on helical structure. The resulting structure was B-form in conformation and local helical distortions were observed about the GT mispair due primarily to its sheared orientation. The effect of mismatch orientation, sequence context and oligonucleotide length on mismatch stability was also investigated using UV absorbance melting and NMR spectroscopy. The results showed that substitution of a TG mispair for a GT mispair was accompanied by a small drop in melting temperature. It was also discovered that sequences in which purine-purine or pyrimidine-pyrimidine stacking occurred induced additional stability of the mismatch resulting in a higher melting temperature of the duplex.Affinity of mismatch GT DNA and its mismatch orientation, sequence context and length analogues for MutS was investigated by monitoring changes to the chemical shifts and linewidths of imino protons resonances during NMR titration. The results showed that MutS displayed higher affinity towards sequences which involved better stacking between the flanking base pairs and the GT/TG mispair.Analogous NMR structural investigations of 6-thioguanine modified 13mer GC DNA and its oxidised derivatives have been successfully carried out. The NMR structure was successfully determined of the former and the results obtained showed the effect on helical structure induced by the substitution of a different DNA lesion.Although the crystal structures of MutS bound to DNA mismatches have been known for a number of years, the analogous crystal structures of uncomplexed apo MutS have not been determined to date. Consequently, vital structural knowledge on the large change in conformation of MutS upon binding to the DNA mismatch is seriously lacking. We have successfully isolated the structurally and functionally important NTD of E. coli MutS and its labelled (13C, 15N) analogues and have shown that it is endowed with a stable, tertiary structural fold and well suited to NMR structure determination. This is exemplified by the assignments of several backbone amide and side chain resonances using isotope aided 3D NMR techniques.EThOS - Electronic Theses Online ServiceGBUnited Kingdo
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