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Sound-Environment Monitoring Method Based on Computational Auditory Scene Analysis

Journal of Signal and information processing 2017年第2期8卷 65-77页

作者： Mitsuru Kawamoto Service Sensing Assimilation and Modeling Research Group Human Informatics Research Institute National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Japan

Monitoring techniques are a key technology for examining the conditions in various scenarios, e.g., structural conditions, weather conditions, and disasters. In order to understand such scenarios, the appropriate extraction of their features from observation data is important. This paper proposes a monitoring method that allows sound environments to be expressed as a sound pattern. To this end, the concept of synesthesia is exploited. That is, the keys, tones, and pitches of the monitored sound are expressed using the three elements of color, that is, the hue, saturation, and brightness, respectively. In this paper, it is assumed that the hue, saturation, and brightness can be detected from the chromagram, sonogram, and sound spectrogram, respectively, based on a previous synesthesia experiment. Then, the sound pattern can be drawn using color, yielding a “painted sound map.” The usefulness of the proposed monitoring technique is verified using environmental sound data observed at a galleria.

关键词： Sound-Environment visualization Environmental Sounds Monitoring Painted Sound Patterns Synesthesia

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All-optical Switches for optical Soliton Interactions in a Birefringent Fiber

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Chinese Physics Letters 2023年第12期40卷 51-55页

作者：张鑫伊厚会姚延立王树斌石领先 School of Intelligent Manufacturing Weifang University of Science and TechnologyWeifang 262700China Institute of Aeronautical Engineering Binzhou UniversityBinzhou 256603China Flight College Binzhou UniversityBinzhou 256603China

Interactions among optical solitons can be used to develop photonic information processing devices such as alloptical switches and all-optical logic gates. It is the key to achieve high-speed, high-capacity all-optical networks and optical computers, which is also important in academy. We study the properties of all-optical switches of optical solitons in birefringent fibers, based on the coupled nonlinear Schr¨odinger equations. It is found that under different initial conditions we can achieve all-optical switching functions. We also study the influence of different physical parameters of birefringent fibers on all-optical soliton switching. The relevant conclusions are conducive to achieving the all-optical switching function of optical solitons in birefringent fibers, providing useful guidance for widespread applications of optical soliton all-optical switches in birefringent fibers of communications.

关键词： fibers soliton solitons

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On-chip photonic Fourier transform with surface plasmon polaritons

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Light(Science & Applications) 2016年第1期5卷 618-623页

作者： Shan Shan Kou Guanghui Yuan Qian Wang Luping Du Eugeniu Balaur Daohua Zhang Dingyuan Tang Brian Abbey Xiao-Cong Yuan Jiao Lin Department of Chemistry and Physics La Trobe Institute for Molecular Science(LIMS)La Trobe UniversityMelbourneVIC 3086Australia Australian Research Council Centre of Excellence for Advanced Molecular Imaging Australia School of Physics The University of MelbourneVIC 3010Australia Centre for Disruptive Photonic Technologies Nanyang Technological UniversitySingapore 637371Singapore Institute of Materials Research and Engineering A*STAR3 Research LinkSingapore 117602Singapore Nanophotonics Research Centre Shenzhen University&Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore 639798Singapore School of Engineering RMIT UniversityMelbourneVIC 3001Australia

The Fourier transform(FT),a cornerstone of optical processing,enables rapid evaluation of fundamental mathematical operations,such as derivatives and ***,a converging lens performs an optical FT in free space when light passes through *** speed of the transformation is limited by the thickness and the focal length of the *** using the wave nature of surface plasmon polaritons(SPPs),here we demonstrate that the FT can be implemented in a planar configuration with a minimal propagation distance of around 10 mm,resulting in an increase of speed by four to five orders of *** photonic FT was tested by synthesizing intricate SPP waves with their Fourier *** reduced dimensionality in the minuscule device allows the future development of an ultrafast on-chip photonic information processing platform for large-scale optical computing.

关键词： diffraction Fourier optics optical computing optical information processing surface plasmon polaritons

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Three-dimensional visualization of the functional fascicular groups of a long-segment peripheral nerve

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Neural Regeneration Research 2018年第8期13卷 1465-1470页

作者： Jian Qi Wei-Ya Wang Ying-Chun Zhong Jia-Ming Zhou Peng Luo Ping Tang Cai-Feng He Shuang Zhu Xiao-Lin Liu Yi Zhang Department of Orthopedics and Microsurgery First Affiliated Hospital of Sun Yat-sen University Department of Plastic Surgery Nanxishan Hospital of Guangxi Zhuang Autonomous Region Automation College Guangdong University of Technology Scientific Research Department Sixth Affiliated Hospital of Sun Yat-sen University Department of Orthopedics Shenzhen Nanshan People's Hospital Zhongshan University Medical Equipment Co. Ltd. Department of Joint and Orthopedics Orthopedic Center Zhujiang Hospital of Southern Medical University Department of Plastic Surgery First Affiliated Hospital of Sun Yat-sen University

The three-dimensional（3D） visualization of the functional bundles in the peripheral nerve provides direct and detailed intraneural spatial information. It is useful for selecting suitable surgical methods to repair nerve defects and in optimizing the construction of tissue-engineered nerve grafts. However, there remain major technical hurdles in obtaining, registering and interpreting 2D images, as well as in establishing 3D models. Moreover, the 3D models are plagued by poor accuracy and lack of detail and cannot completely reflect the stereoscopic microstructure inside the nerve. To explore and help resolve these key technical problems of 3D reconstruction, in the present study, we designed a novel method based on re-imaging techniques and computer image layer processing technology. A 20-cm ulnar nerve segment from the upper arm of a fresh adult cadaver was used for acetylcholinesterase（ACh E） staining. Then, 2D panoramic images were obtained before and after ACh E staining under the stereomicroscope. Using layer processing techniques in Photoshop, a space transformation method was used to fulfill automatic registration. The contours were outlined, and the 3D rendering of functional fascicular groups in the long-segment ulnar nerve was performed with Amira 4.1 software. The re-imaging technique based on layer processing in Photoshop produced an image that was detailed and accurate. The merging of images was accurate, and the whole procedure was simple and fast. The least square support vector machine was accurate, with an error rate of only 8.25%. The 3D reconstruction directly revealed changes in the fusion of different nerve functional fascicular groups. In conclusion. The technique is fast with satisfactory visual reconstruction.

关键词： nerve regeneration peripheral nerve ulnar nerve three-dimensional reconstruction functional fascicular group registration segmentation locating spots auto-registration acetylcholinesterase neural regeneration

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天空光遮挡法水体光谱测量便携版漂浮式光学浮标研发与应用

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遥感学报 2022年第1期26卷 211-220页

作者：田礼乔李森孙相晗孙兆华宋庆君武汉大学测绘遥感信息工程国家重点实验室武汉430079 Easy Ocean technology Ltd. Halifax B3H1N4Canada 自然资源部国家卫星海洋应用中心北京100081

离水辐亮度L_(w)(Water-leaving radiance)是水色遥感现场观测中的关键物理量之一,由其计算获得的遥感反射率R_(rs)(Remote sensing reflectance)是水色遥感参数反演的最基本参数。天空光遮挡法SBA(Skylightblocked approach)可以直接测量水体离水辐亮度,作为一种新兴方法具有较强的推广应用潜力。本文介绍了基于天空光遮挡法的便携版漂浮式光学浮标FOBY-P(the Portable Floating optical Buoy),其具有浮体自阴影小、布放简便等优势,在中国近海开展的现场观测实验结果表明:(1)FOBY-P结构设计上能在一定程度上避免太阳天顶角较大条件下浮体的自阴影遮挡影响,初步评估结果表明其400—700 nm自阴影影响在浑浊水体0.9),在490—565 nm波长范围内R_(rs)的偏差<5%,差异可能由观测方法不同引起,水面之上法水—气界面校正的不确定性可能是引起部分偏差的重要因素之一。该研究表明便携版漂浮式光学浮标(FOBY-P)可满足近海较高等级海况(3—4级)下的复杂水体现场观测需求,随着针对FOBY-P的数据质量控制与处理方法的不断优化,有望获取更高质量的现场水体光谱观测结果。

关键词：水色遥感水体光谱现场测量天空光遮挡法便携版漂浮式光学浮标

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