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Towards an ultrafast 3D imaging scanning LiDAR system: a review

Photonics Research 2024年第8期12卷 1709-1729页

作者： ZHI LI YAQI HAN LICAN WU ZIHAN ZANG MAOLIN DAI SZE YUN SET shinji yamashita QIAN LI H.Y.FU Tsinghua Shenzhen International Graduate School Tsinghua University Department of Electrical Engineering and Information Systems The University of Tokyo Research Center for Advanced Science and Technology The University of Tokyo School of Electronic and Computer Engineering Peking University

Light detection and ranging (LiDAR), as a hot imaging technology in both industry and academia, has undergone rapid innovation and evolution. The current mainstream direction is towards system miniaturization and integration. There are many metrics that can be used to evaluate the performance of a LiDAR system, such as lateral resolution, ranging accuracy, stability, size, and price. Until recently, with the continuous enrichment of LiDAR application scenarios, the pursuit of imaging speed has attracted tremendous research interest. Particularly, for autonomous vehicles running on motorways or industrial automation applications, the imaging speed of LiDAR systems is a critical bottleneck. In this review, we will focus on discussing the upper speed limit of the LiDAR system. Based on the working mechanism, the limitation of optical parts on the maximum imaging speed is analyzed. The beam scanner has the greatest impact on imaging speed. We provide the working principle of current popular beam scanners used in LiDAR systems and summarize the main constraints on the scanning speed. Especially, we highlight the spectral scanning LiDAR as a new paradigm of ultrafast ***, to further improve the imaging speed, we then review the parallel detection methods, which include multiple-detector schemes and multiplexing technologies. Furthermore, we summarize the LiDAR systems with the fastest point acquisition rate reported nowadays. In the outlook, we address the current technical challenges for ultrafast LiDAR systems from different aspects and give a brief analysis of the feasibility of different approaches.

关键词： Frequency combs High speed imaging Optical access networks Remote sensing Single pixel imaging Spatial light modulators

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Wide and Fast Wavelength-Swept Fiber Lasers Based on Dispersion Tuning and Their Application to Optical Coherence Tomography

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Photonic Sensors 2013年第4期3卷 320-331页

作者： shinji yamashita Yuya TAKUBO Research Center for Advanced Science and Technology (RCAST) The University of Tokyo 4-6-1 Komaba Meguro-kuTokyo 153-8904 Japan

We recently proposed a new class of wavelength-swept lasers for swept-source optical coherence tomography （SS-OCT）. It uses the same gain medium with the conventional swept lasers, but does not require any tunable filters. It is based on a principle called ＂dispersion tuning＂, in which a highly dispersive medium is inserted in the laser cavity, and loss/gain modulation is applied to mode-lock the laser. Since the cavity contains no mechanical components, such as tunable filters, we could achieve the very high sweep rate. In this review paper, we describe the principle of the dispersion-tuned swept lasers in detail and present our recent work on the application to the SS-OCT system.

关键词： OCT swept lasers dispersion tuning

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Effect of precipitation/re-dissolution processes from the supersaturated solution on the intestinal absorption of poorly water-soluble drugs

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Asian Journal of Pharmaceutical Sciences 2016年第1期11卷 68-69页

作者： Haruki Higashino Keiko Minami Makoto Kataoka shinji yamashita Faculty of Pharmaceutical Sciences Setsunan University

As one of the possible technologies to improve the oral absorption of poorly water-soluble drugs, supersaturable formulation, which enables to dissolve the drug to the higher concentration than their equilibrium solubility, is now attracting the attention (1)This include salt-formation, soliddispersion, co-crystallization or the use of amorphous *** supersaturation is a thermodynamically metastable state,supersaturated solution has a high potential to precipitate. Some pharmaceutical excipients.

关键词： Supersaturation Oral absorption Precipitation Re-dissolution HPMC

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High-power sub-picosecond all-fiber laser source at 1.56 μm

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Chinese Optics Letters 2014年第11期12卷 53-55页

作者：戴雯宋有建徐博 Amos Martinez shinji yamashita 胡明列王清月 Ultrafast Laser Laboratory Key Laboratory of Opto-electronic Information Science and Technology of Ministry of Education College of Precision Instruments and Opto-electronics Engineering Tianjin University Department of Electronic Engineering The University of Tokyo

We demonstrate an all-fiber, high-power, and high stability ultrafast laser source operating at 1563 nm. A highly stable, self-starting carbon nanotube（CNT） mode-locked femtosecond fiber laser is used as the seed source. The amplifier stage uses a fiber chirped pulse amplification configuration. The main power amplifier is based on a cladding-pumped Er–Yb co-doped fiber with 10 μm active single-mode core diameter. The laser source provides 3.4 W average output power at 75 MHz repetition rate. The pulses are compressed to 765 fs by a low-loss transmission grating pair. The robust, compact, and high-power 1560 nm fiber laser source can be used for eye surgery and solar cell micromachining.

关键词： mode rate CNT High-power sub-picosecond all-fiber laser source at 1.56 high pair

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西南日本秋吉带石炭系高山(Ko-yama)灰岩群的石炭纪(Visean-Moscovian)牙形石序列(英文)

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地球学报 2012年第S1期33卷 25-28页

作者： Keisuke ISHIDA Sigeyuki SUZUKI Noriyuki INADA shinji yamashita Laboratory of Geology Institute of SASTokushima University770-8502TokushimaJapan Dept.Earth Sci. Okayama University700-8530OkayamaJapan

The Carboniferous conodont faunal succession of the lower part of Ko-yama Limestone Group was *** confirmed upper Visean-lower Moscovian lithostratigraphy of the group is characterized by the clastic carbonates with common association of the basaltic pyroclastics and some intercalation of spicular chert *** faunal succession of Gnathodus semiglaber(upper Visean),Gnathodus praebilineatus-Lochriea multinodosa(upper Visean),Lochriea ziegleri-Gnathodus girtyi girtyi s.l.(lower Serpukhovian),Neoganthodus symmetricus-Idiognathodus primulus(middle-upper Bashkirian),and Idiognathoides convexus-Gondolella clarki(lower Moscovian) faunas,appears in concordance with the lithostratigraphic *** faunas are correlative with those from the conodont zones of the Hina,Atetsu,Akiyoshi and Omi limestone groups in the Akiyoshi *** Visean/Serpukhovian boundary of the section was recognized by the FAD of Lochriea ziegleri.

关键词： conodont Ko-yama Limestone Carboniferous Akiyoshi Belt SW Japan

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NDRG2 expression may be one of the prognostic biomarkers of glioma

NDRG2 expression may be one of the prognostic biomarkers of ...

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中国抗癌协会神经肿瘤专业委员会第八届学术会议

作者： shinji yamashita Kiyotaka Yokogami Go Takeishi Hisao Uehara Hideo Takeshima Depertment of Neurosurgery Faculty of Medicine University of Miyazaki

＜正＞Background Oncogene Myc exerts its biological functions mainly through transcriptional regulation of its target genes, which are involved in cellular interaction, proliferation and apoptosis. N-Myc downstream-re...

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多文化共生：跨国移民与多元文化的新日本

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北方民族大学学报（哲学社会科学版） 2011年第1期 15-21页

作者： [日]山下晋司东京大学大学院日本东京

美国人类学家玛格丽特.米德60年前在其未出版的一本著作题目中使用了"学习共同生活在一个世界"。60年后的今天,这个题目还是那么贴切。日本近年展开的"多文化共生"项目就是走向"全人类生活在一个世界"之基本目标的一个尝试。

关键词：移民新日本多元文化一个世界

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NDRG2 closely related with differentiation and cell proliferation in gliomas

NDRG2 closely related with differentiation and cell prolifer...

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中国抗癌协会神经肿瘤专业委员会第八届学术会议

作者： Kiyotaka Yokogami shinji yamashita Go Takeishi Singo Nakahata Kazuhiro Morishita Hideo Takeshima Depertment of Neurosurgery Faculty of MedicineUniversity of Miyazaki Division of Tumor and Cellular Biochemistry Department of Medical SciencesFaculty of MedicineUniversity of Miyazaki

＜正＞Background and purpose: N-Myc downstream-regulated gene 2（NDRG2）,together with NDRG1, NDRG3,and NDRG4,constitute the NDRG gene family,a new class of Myc-repressed ***,well known as earliest oncogenes,has a strong

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Two cases of rare sellar tumors mimicking invasive pituitary adenoma

Two cases of rare sellar tumors mimicking invasive pituitary...

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中国抗癌协会神经肿瘤专业委员会第八届学术会议

作者： Go Takeishi Takeya Niibo shinji yamashita Sayaka Moriguchi-Goto Kiyotaka Yokogami Hisao Uehara Hideo Takeshima Department of Neurosurgery Faculty of MedicineUniversity of Miyazaki Department of Pathology Faculty of MedicineUniversity of Miyazaki

＜正＞Solitary seller and/or parasaller lesion includes a rare entity,which makes preoperative diagnosis difficult. Here we report two cases of rare such tumors mimicking invasive pituitary adenoma;*** sellar neurobla...

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西南日本秋吉带石炭系高山(Ko-yama)灰岩群的褶皱构造(英文)

西南日本秋吉带石炭系高山(Ko-yama)灰岩群的褶皱构造(英文)

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国际地学计划IGCP-589项目“亚洲特提斯域的演化：成因，过程和结果”第一次国际学术研讨会

作者： Noriyuki INADA Shigeyuki SUZUKI Keisuke ISHIDA shinji yamashita Dept. Earth Sci. Okayama University700-8530OkayamaJapan Laboratory of Geology Institute of SASTokushima University770-8502TokushimaJapan

The study area is located in Kawakami-cho,Okayama Prefecture,which is occupied by Lower Carboniferous to Middle Permian Ko-yama Limestone Group (Yokoyama et al.,1979),Permian Yoshii Group (Sano et al.,1987) and Triassic Nariwa Group (Teraoka,1959).The Nariwa Group unconformably covers the Paleozoic successions (Otoh,1985).These successions belong to the Akiyoshi *** Ko-yama

关键词： folded structure Ko-yama Limestone Carboniferous Akiyoshi Belt

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