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Photonics Research 2018年第9期6卷 918-924页

作者： HAYOUNG JEONG PAULSON BJORN seongjin hong SEUNGUK CHEON KYUNGHWAN OH Photonic Device Physics Laboratory Institute of Physics and Applied Physics Yonsei University50 Yonsei-ro Seodaemun-guSeoul 120-749South Korea

The denaturation of double-stranded deoxyribonucleic acid(ds-DNA) has been well known to break nucleobase bonds, resulting in single-stranded deoxyribonucleic acid(ss-DNA) in solutions, which can recombine to form ds-DNA in a reversible manner. We developed an efficient process to irreversibly maintain various DNA denaturation levels in thin solid films in order to investigate the impacts of the denaturation on the optical properties of DNA films. By adding NaOH in an aqueous solution of salmon testis DNA, we flexibly controlled the level of denaturation in the solution, which was then spin-coated on Si and silica substrates to irreversibly bind ss-DNAs in a thin solid film. The denaturation of DNA in thin solid films was experimentally confirmed by ultravioletvisible and Fourier transform infrared spectroscopic investigations, whose level could be controlled by the NaOH content in the aqueous solution precursor. By this irreversible denaturation process, we developed a new method to flexibly vary the refractive index of DNA thin solid films in a wide range of Δn > 0.02 in the visible to nearinfrared range. Thermo-optic coefficients dn/d T of the films were also experimentally measured in the temperature range from 40℃ to 90℃ to confirm the significant impacts of denaturation. Detailed thin film processes and optical characterizations are discussed.

关键词：二氧化硅光学特性通讯技术技术创新

Laser-driven self-exfoliation of graphene oxide layers on a fiber facet for Q switching of an Er-doped fiber laser at the longest wavelength

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Photonics Research 2020年第8期8卷 1324-1332页

作者： BYUNGJOO KIM seongjin hong JAEDEOK PARK YONGSOO LEE DONG-IL YEOM KYUNGHWAN OH Photonic Device Physics Laboratory Institute of Physics and Applied PhysicsYonsei UniversitySeoul 03722South Korea Department of Physics and Energy Systems Research Ajou UniversitySuwon 16499South Korea

A new method to make an all-fiber nonlinear optic device for laser pulse generation is developed by depositing multi-layer graphene oxide(GO)selectively onto the core of the cleaved fiber facet by combining the electrical arc discharge and the laser-driven *** the GO colloid droplet with sub-nanoliter volume,we obtained a GO bulk layer deposited on a fiber facet of the order of milliseconds by using an electric *** prepared fiber facet was then included in an Er-doped fiber laser(EDFL)cavity and we obtained a few layers of GO having nonlinear optic two-dimensional(2D)characteristics selectively on the fiber core by the laser-driven *** 2D GO layers on the fiber core served as a stable and efficient saturable absorber enabling robust pulse train generation atλ1600.5 nm,the longest Q-switched laser wavelength in *** characteristics were analyzed as we varied the pump power atλ980 nm from 105.2 mW to 193.6 mW,to obtain the maximum repetition rate of 17.8 kHz and the maximum output power of 2.3 mW with the minimum pulse duration of 7.8μ*** proposed method could be further applied to other novel inorganic 2D materials opening a window to explore their novel nonlinear optic laser applications.

关键词： fiber laser switched

Nanoliter liquid refractive index sensing using a silica V-groove fiber interferometer

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Photonics Research 2019年第7期7卷 107-112页

作者： Quan Chai Hyeonwoo Lee seongjin hong Yongsoo Lee Junbum Park Jianzhong Zhang Kyunghwan Oh Photonic Device Physics Laboratory Institute of Physics and Applied PhysicsYonsei UniversitySeoul 03722South Korea Key Laboratory of In-Fiber Integrated Optics of Ministry of Education School of ScienceHarbin Engineering UniversityHarbin 150001China

A unique all-fiber interferometric sensor was proposed and successfully demonstrated efficient low-refractiveindex liquid sensing in the range from 1.33 to 1.37, which is compatible with those of bio-liquids.A special silica coreless optical fiber with an open V-groove was used as an optical sensing medium, which provided a high sensitivity for a minute liquid volume in the nanoliter *** V-groove fiber (VGF) was serially concatenated between two single-mode fibers (SMFs).The LPOi mode guided along the input SMF excited the higherorder inodes in the VGF to generate multimode interference,whose spectrum was transmitted through the output SMF. A single liquid droplet with volume of ~80 nanoliters wet the entire hydrophilic surface of the VGF, and the transmission spectra shifted corresponding to its refractive index in a very linear manner. The sensor also showed a negligible temperature cross-sensitivity in the range 25℃-75℃, which overlaps with the biological temperature window such that the sensitivity of 159.696 nm per refractive index unit(nm/RIU) remained independent of the temperature variation. Modal properties of VGF were thoroughly analyzed numerically, and detailed processes for the sensor fabrication and sensing experiments were reported.

关键词： interferometer processes fabrication

Electrically tunable third-harmonic generation using intersubband polaritonic metasurfaces

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Light(Science & Applications) 2024年第8期13卷 1666-1674页

作者： seongjin Park Jaeyeon Yu Gerhard Boehm Mikhail A.Belkin Jongwon Lee Department of Electrical Engineering Ulsan National Institute of Science and Technology(UNIST)UlsanRepublic of Korea Walter Schottky Institute Technical University of MunichGarchingGermany

Nonlinear intersubband polaritonic metasurfaces,which integrate giant nonlinear responses derived from intersubband transitions of multiple quantum wells(MQWs)with plasmonic nanoresonators,not only facilitate efficient frequency conversion at pump intensities on the order of few tens of kW cm^(-2)but also enable electrical modulation of nonlinear responses at the individual meta-atom level and dynamic beam *** electrical modulation characteristics of the magnitude and phase of the nonlinear optical response are realized through Stark tuning of the resonant intersubband *** this study,we report,for the first time,experimental implementations of electrical modulation characteristics of mid-infrared third-harmonic generation(THG)using an intersubband polaritonic metasurface based on MQW with electrically tunable third-order nonlinear ***,we achieved a 450%modulation depth of the THG signal,86%suppression of zero-order THG diffraction tuning based on local phase tuning exceeding 180 degrees,and THG beam steering using phase *** work proposes a new route for electrically tunable flat nonlinear optical elements with versatile functionalities.

关键词： tunable tuning pump

Use of Asian selected agricultural byproducts to modulate rumen microbes and fermentation

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Journal of Animal Science and Biotechnology 2017年第2期8卷 317-326页

作者： Yasuo Kobayashi seongjin Oh Htun Myint Satoshi Koike Lab of Animal Function and Nutrition Research Faculty of AgricultureHokkaido UniversitySapporo 060-8589 Japan

In the last five decades, attempts have been made to improve rumen fermentation and host animal nutrition through modulation of rumen microbiota. The goals have been decreasing methane production, partially inhibiting protein degradation to avoid excess release of ammonia, and activation of fiber digestion. The main approach has been the use of dietary supplements. Since growth-promoting antibiotics were banned in European countries in2006, safer alternatives including plant-derived materials have been explored. Plant oils, their component fatty acids,plant secondary metabolites and other compounds have been studied, and many originate or are abundantly available in Asia as agricultural byproducts. In this review, the potency of selected byproducts in inhibition of methane production and protein degradation, and in stimulation of fiber degradation was described in relation to their modes of action. In particular, cashew and ginkgo byproducts containing alkylphenols to mitigate methane emission and bean husks as a source of functional fiber to boost the number of fiber-degrading bacteria were highlighted. Other byproducts influencing rumen microbiota and fermentation profile were also described. Future application of these feed and additive candidates is very dependent on a sufficient, cost-effective supply and optimal usage in feeding practice.

关键词： Agricultural byproduct Fermentation Fiber degradation Methane mitigation Microbiota Plant secondary metabolites Rumen

Characterization of Viromes of the Ticks in Central and Eastern China

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Characterization of Viromes of the Ticks in Central and East...

作者： seongjin WANG 上海交通大学

学位级别：硕士

蜱是对人类和动物健康构成威胁的各种传染病的主要传播媒介。到目前为止,还没有发表过使用高通量二代测序研究中国东中部不同动物寄生蜱中病毒多样性的论文。本研究使用宏基因组学方法来揭示2017年和2018年蜱类病毒的多样性和丰富性。从... 详细信息

蜱是对人类和动物健康构成威胁的各种传染病的主要传播媒介。到目前为止,还没有发表过使用高通量二代测序研究中国东中部不同动物寄生蜱中病毒多样性的论文。本研究使用宏基因组学方法来揭示2017年和2018年蜱类病毒的多样性和丰富性。从犬,牛,山羊/绵羊和猪等宿主身上鉴定出四种蜱,包括血红扇头蜱、图兰扇头蜱、长角血蜱和黄血蜱。通过Miseq平台测序,在由258个蜱虫构建的40个蜱虫库中获得了15,020,533个高质量序列。修剪后得到7,578,983个序列,其中128,799个序列可以注释为病毒。属于ss RNA病毒的序列占93.08%（99,489/106,882）,属于ss DNA病毒的序列占3.67%（3,926/106,882）。多样性分析表明,与昌平蜱病毒2型（Changping tick virus 2）、伯乐蜱病毒3型（Bole tick virus 3）相关的大量非分类病毒的存在,似乎是区分类群间病毒多样性的重要因素。病毒谱分析研究表明,大多数病毒序列与未分类的病毒具有最接近的序列一致性。随后,与动物病毒中白纤病毒科（Phenuiviridae）、圆环病毒科,及植物病毒中的virgaviridae病毒重叠群序列相似病毒也被确定为第二常见的病毒序列。部分病毒序列与昆虫病毒、噬菌体和巨型病毒具有同源性。这些结果反映了寄主的饮食和生活习惯。对布尼亚病毒属的系统进化分析表明,已鉴定的重叠群与白纤病毒科（phenuiviridae,）,内罗病毒科（nairoviridae,）,泛布尼亚病毒科（peribunyaviridae）和未分类家族具有亲缘关系。但这些新发现的布尼亚病毒对人类和动物健康的意义还有待进一步研究。还确定了代表三个病毒科的大型重叠群,包括猪流感病毒科,细小病毒科和非分类家族。这些重叠群的一些序列与现有的病毒序列具有高度分歧的氨基酸特征。此外,我们还在警犬的蜱虫中发现了第一株犬圆环病毒,表明,蜱可以携带犬圆环病毒,而这种病毒可能是通过这些蜱为载体进行传播,这突出了它感染其他犬科宿主的能力。综上所述,我们的研究揭示了中国东中部蜱虫中存在多种病毒群落。我们的研究增加了对病毒多样性的了解,并扩展了对中国东中部蜱虫所携带的病毒谱的认识。

关键词：蜱宏基因组学生物信息学布尼亚病毒犬圆环病毒蜱病毒

Bioinspired magnetic cilia:from materials to applications

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Microsystems & Nanoengineering 2023年第6期9卷 107-128页

作者： seongjin Park Geonjun Choi Minsu Kang Woochan Kim Jangho Kim Hoon Eui Jeong Department of Mechanical Engineering Ulsan National Institute of Science and Technology(UNIST)Ulsan44919Republic of Korea Department of Convergence Biosystems Engineering Chonnam National UniversityGwangju61186Republic of Korea Interdisciplinary Program in IT-Bio Convergence System Chonnam National UniversityGwangju61186Republic of Korea

Microscale and nanoscale cilia are ubiquitous in natural systems where they serve diverse biological *** artificial magnetic cilia have emerged as a highly promising technology with vast potential applications,ranging from soft robotics to highly precise *** this review,we comprehensively discuss the roles of cilia in nature and the various types of magnetic particles utilized in magnetic cilia;additionally,we explore the top-down and bottom-up fabrication techniques employed for their ***,we examine the various applications of magnetic cilia,including their use in soft robotics,droplet and particle control systems,fluidics,optical devices,and ***,we present our conclusions and the future outlook for magnetic cilia research and development,including the challenges that need to be overcome and the potential for further integration with emerging technologies.

关键词： magnetic overcome precise

Changes in the distribution of South Korean forest vegetation simulated using thermal gradient indices

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Science China(Life Sciences) 2010年第7期53卷 784-797页

作者： CHOI Sungho LEE Woo-Kyun SON Yowhan YOO seongjin LIM Jong-Hwan Department of Environmental Science and Ecological Engineering Korea University Korea Forest Research Institute

To predict changes in South Korean vegetation distribution,the Warmth Index(WI) and the Minimum Temperature of the Coldest Month Index(MTCI) were *** climate data of the past 30 years,from 1971 to 2000,was obtained from the Korea Meteorological *** Fifth-Generation National Center for Atmospheric Research(NCAR) /Penn State Mesoscale Model(MM5) was used as a source for future climatic data under the A1B scenario from the Special Report on Emission Scenario(SRES) of the Intergovernmental Panel on Climate Change(IPCC).To simulate future vegetation distribution due to climate change,the optimal habitat ranges of Korean tree species were delimited by the thermal gradient indices,such as WI and *** categorize the Thermal Analogy Groups(TAGs) for the tree species,the WI and MTCI were orthogonally plotted on a two-dimensional grid *** TAGs were then designated by the analogue composition of tree species belonging to the optimal WI and MTCI *** a result of the clustering process,22 TAGs were generated to explain the forest vegetation distribution in *** primary change in distribution for these TAGs will likely be in the shrinkage of areas for the TAGs related to Pinus densiflora and ***,and in the expansion of the other TAG areas,mainly occupied by evergreen broad-leaved trees,such as Camellia japonica,Cyclobalanopsis glauca,and Schima *** the TAGs to explain the effects of climate change on vegetation distribution on a more regional scale resulted in greater detail than previously used global or continental scale vegetation models.

关键词： climate change forest distribution warmth index minimum temperature thermal analogy group

Estimation of carbon storage based on individual tree detection in Pinus densiflora stands using a fusion of aerial photography and LiDAR data

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Science China(Life Sciences) 2010年第7期53卷 885-897页

作者： KIM So-Ra KWAK Doo-Ahn LEE Woo-Kyun SON Yowhan BAE Sang-Won KIM Choonsig YOO seongjin Division of Environmental Science and Ecological Engineering Korea University Forest Practice Research Center Korea Forest Research Institute Departement of Forest Resources Jinju National University

The objective of this study was to estimate the carbon storage capacity of Pinus densiflora stands using remotely sensed data by combining digital aerial photography with light detection and ranging(LiDAR) data.A digital canopy model(DCM),generated from the LiDAR data,was combined with aerial photography for segmenting crowns of individual *** eliminate errors in over and under-segmentation,the combined image was smoothed using a Gaussian filtering *** processed image was then segmented into individual trees using a marker-controlled watershed segmentation *** measuring the crown area from the segmented individual trees,the individual tree diameter at breast height(DBH) was estimated using a regression function developed from the relationship observed between the field-measured DBH and crown *** above ground biomass of individual trees could be calculated by an image-derived DBH using a regression function developed by the Korea Forest Research *** carbon storage,based on individual trees,was estimated by simple multiplication using the carbon conversion index(0.5),as suggested in guidelines from the Intergovernmental Panel on Climate *** mean carbon storage per individual tree was estimated and then compared with the field-measured *** study suggested that the biomass and carbon storage in a large forest area can be effectively estimated using aerial photographs and LiDAR data.

关键词： LiDAR aerial photograph region growing marker-control watershed segmentation carbon storage

Optical Vernier sampling using a dual-comb-swept laser to solve distance aliasing

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Photonics Research 2021年第5期9卷 657-667页

作者： seongjin BAK GYEONG HUN KIM HANSOL JANG CHANG-SEOK KIM Department of Cogno-Mechatronics Engineering Pusan National UniversityBusan 46241Republic of Korea

Optical interferometry using comb-swept lasers has the advantage of efficiently reducing the acquisition bandwidth for high-speed and long-range detection. However, in general, the use of a comb-swept laser involves a critical limitation in that the absolute distance cannot be measured, and, thus, multiple layers cannot be distinguished when measuring each position. This is because of the distance ambiguity induced by optical aliasing, in which there is periodic repetition of the frequency of an interferometric signal owing to discrete spectral sweeping, which does not occur in conventional optical interferometry that uses a continuous swept laser. In this paper, we introduce an optical Vernier sampling method using a dual-comb-swept laser to measure the absolute distances in a multi-layer target. For this, we designed a new type of dual-comb-swept laser to include two different free spectral ranges(FSRs) in separated wavelength bands to provide a stable lasing condition. Using a principle similar to that of a Vernier caliper for length measurement, the two different FSRs can be used to recover a higher frequency of an optical interferometric signal to measure longer distances from different layers in a *** the dual-comb-swept laser in optical interferometry, we solved the optical aliasing issue and measured the absolute distances of three layers separated over 83 mm using a point-scanning imaging setup and the simultaneous absolute distance of the top surfaces separated over 45 mm using a full-field imaging setup at14 and 8 times lower acquisition bandwidth than a conventional continuous swept laser that is based on optical interferometry.

关键词： laser interferometry absolute