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Complete characterization of ultrafast optical fields by phase-preserving nonlinear autocorrelation

Light(Science & Applications) 2022年第10期11卷 2451-2462页

作者： Alexander Gliserin Soo Hoon Chew Seungchul kim Dong eon kim Department of Optics and Mechatronics Engineering College of Nanoscience and NanotechnologyPusan National University2 Busandaehak-ro 63beon-gilBusan 46241South Korea Department of Cogno Mechatronics Engineering College of Nanoscience and NanotechnologyPusan National University2 Busandaehak-ro 63beon-gilBusan 46241South Korea Max Planck Center for Attosecond Science Max Planck POSTECH/Korea Research Initiative77 Cheongam-roPohang 37673South Korea Department of Physics Center for Attosecond Science and TechnologyPohang University of Science and Technology77 Cheongam-roPohang 37673South Korea

Nonlinear autocorrelation was one of the earliest and simplest tools for obtaining partial temporal information about an ultrashort optical pulse by gating it with ***,since the spectral phase is lost in a conventional autocorrelation measurement,it is insufficient for a full characterization of an ultrafast electric field,requiring additional spectral information for phase ***,we show that introducing an intensity asymmetry into a conventional nonlinear interferometric autocorrelation preserves some spectral phase information within the autocorrelation signal,which enables the full reconstruction of the original electric field,including the direction of time,using only a spectrally integrating *** call this technique Phase-Enabled Nonlinear Gating with Unbalanced Intensity(PENGUIN).It can be applied to almost any existing nonlinear interferometric autocorrelator,making it capable of complete optical field characterization and thus providing an inexpensive and less complex alternative to methods relying on spectral measurements,such as frequency-resolved optical gating(FROG)or spectral phase interferometry for direct electric-field reconstruction(SPIDER).More importantly,PENGUIN allows the precise characterization of ultrafast fields in non-radiative(e.g.,plasmonic)nonlinear optical interactions where spectral information is *** demonstrate this novel technique through simulations and experimentally by measuring the electric field of~6-fs laser pulses from a Ti:sapphire *** results are validated by comparison with the well-established FROG method.

关键词： autocorrelation nonlinear characterization

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Manifestation of attosecond XUV fields temporal structures in attosecond streaking spectrogram

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Chinese Optics Letters 2011年第6期9卷 100-103页

作者：陈光龙曹云玖 Dong eon kim School of Fundamental Studies Shanghai University of Engineering Science Department of Physics Center for Attosecond and Technology (POTECH)

The features of an attosecond extreme ultraviolet （XUV） field are encoded in the attosecond XUV spectrogram. We investigate the effect of the temporal structures of attosecond XUV fields on the attosecond streaking spectrogram. Factors such as the number of attosecond XUV pulses and the temporal chirp of attosecond XUV pulses are considered. Results indicate that unlike the attosecond streaking spectrogram for an attosecond XUV field with two pulses of a half-cycle separation of streaking field, the spectrogram for the attosecond XUV field with three pulses demonstrates fine spectral fringes in separated traces.

关键词： Manifestation of attosecond XUV fields temporal structures in attosecond streaking spectrogram NIR

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Differential ligand binding/trafficking for distinct CTLA-4 fates: is it an expandable mechanism?

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Cellular & Molecular Immunology 2023年第1期20卷 1-2页

作者： Ji eon kim Eunmi kim Jung Weon Lee Department of Pharmacy Research Institute of Pharmaceutical SciencesCollege of PharmacySeoul National UniversitySeoul08826Republic of Korea

In a recent issue of Nature Immunology,Kennedy et *** that CTLA-4(CD152)differentially targets two distinct ligands,CD80 and CD86,on antigen-presenting cells(APCs)for destruction or recycling following transendocytosis(TE),resulting in separate fates for CTLA-4 on T_(reg) cells and thereby regulating ***,whereas CTLA-4 tightly binds CD80 for TE and causes ubiquitination and trafficking to late endosomes and lysosomes for degradation,CTLA-4 weakly binds CD86 for TE,resulting in dissociation under acidic conditions(pH<6)and recycling of CTLA-4 to the plasma membrane for further CD86 ***,CD86 targeting by CTLA-4 regulates T-cell function in autoimmunity[1]and presumably immune surveillance of cancer cells(Fig.1).

关键词： thereby traffic weakly

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Effect of heating rate on the properties of silicon carbide fiber with chemical-vapor-cured polycarbosilane fiber

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Journal of Advanced Ceramics 2017年第1期6卷 59-66页

作者： Tae-eon kim Khos-Erdene KHISHIGBAYAR Kwang Youn CHO Ceramic Fiber and Composite Materials Center Korea Institute of Ceramic Engineering and Technology 101 Soho-ro Jinju-si Gyeongsangnam-do 660-031 R.O.Korea

Silicon carbide (SiC) fiber has recently received considerable attention as promising next-generation fiber because of its high strength at temperatures greater than 1300 ℃ in ***-quality SiC fiber is primarily made through a curing and heat treatment *** this study,the chemical vapor curing method,instead of the thermal oxidation curing method,was used to prepare cured polycarbosilane (PCS) *** the high temperature heat treatment of the cured PCS fiber,varied heating rates of 10,20,30,and 40 ℃/min were *** the process,the fiber remained in the amorphous silicon carbide phase,and the measured tensile strength was the greatest when the oxygen content in the heat-treated fiber was low,due to the rapid heating *** fiber produced through this method was also found to have excellent internal oxidation *** fast,continuous process shows a great promise for the production of SiC fiber and the development of high-quality products.

关键词： polycarbosilane (PCS) silicon carbide (SiC) fiber chemical vapor curing rapid heating rate high temperature tensile strength

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Ultrasensitive and Highly Stretchable Multiple‑Crosslinked Ionic Hydrogel Sensors with Long‑Term Stability

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Nano-Micro Letters 2023年第4期15卷 85-96页

作者： Jin‑Young Yu Seung eon Moon Jeong Hun kim Seong Min Kang Department of Mechanical Engineering Chungnam National UniversityDaejeon 34134Korea Emerging Nano‑Materials Research Section Electronics and Telecommunications Research InstituteDaejeon 305‑700Republic of Korea

Flexible hydrogels are receiving significant attention for their application in wearable ***,most hydrogel materials exhibit weak and one-time adhesion,low sensitivity,ice crystallization,water evaporation,and poor self-recovery,thereby limiting their application as *** issues are only partly addressed in previous ***,a multiplecrosslinked poly(2-(methacryloyloxy)ethyl)dimethyl-(3-sulfopropyl)ammonium hydroxide-co-acrylamide)(P(SBMA-co-AAm))multifunctional hydrogel is prepared via a one-pot synthesis method to overcome the aforementioned ***,ions,glycerol,and 2-(methacryloyloxy)ethyl)dimethyl-(3-sulfopropyl)ammonium hydroxide are incorporated to reduce the freezing point and improve the moisture retention *** proposed hydrogel is superior to existing hydrogels because it exhibits good stretchability(a strain of 2900%),self-healing properties,and transparency through effective energy dissipation in its dynamic crosslinked ***,2-(methacryloyloxy)ethyl)dimethyl-(3-sulfopropyl)ammonium hydroxide as a zwitterion monomer results in an excellent gauge factor of 43.4 at strains of 1300-1600%by improving the ion transportability and achieving a strong adhesion of 20.9 kPa owing to the dipole-dipole *** proposed hydrogel is promising for next-generation biomedical applications,such as soft robots,and health monitoring.

关键词： Hydrogel sensors Biocompatibility Multifunction High-sensitivity sensors Multiple-crosslink association

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UBVVI Surface Photometry of the Spiral Galaxy NGC 300 in the Sculptor Group

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Chinese Journal of Astronomy and Astrophysics 2004年第4期4卷 299-310页

作者： Sang Chul kim Hwankyung Sung Hong Soo Park eon-Chang Sung Korea Astronomy Observatory Taejon 305-348Republic of KoreaDepartment of Astronomy and Space ScienceSejong University98 Gunja-dongGwangjin-guSeoul 143-747Republic of KoreaAstronomy ProgramSEESSeoul National UniversitySeoul 151-742Republic of KoreaKorea Astronomy ObservatoryTaejon 305-348Republic of Korea

We present UBVI surface photometry over a 20.5' × 20.5' area of the late-type spiral galaxy NGC 300. We have derived isophotal maps, surface brightness profiles, ellipticity profiles, position angle profiles, and color profiles. By merging our I-band measurements with those of Boker et al. based on Hubble Space Telescope observations, we have obtained combined I-band surface brightness profiles for the region 0.02' have decomposed the profiles into three components: a nucleus, a bulge, and an exponential disk.

关键词： galaxies: spiral - galaxies: photometry - galaxies: individual(NGC 300) - galaxies: nuclei

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Strong-field photoelectron holography in the subcycle limit

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Light(Science & Applications) 2024年第6期13卷 1032-1040页

作者： Tsendsuren Khurelbaatar Jaewuk Heo ShaoGang Yu XuanYang Lai XiaoJun Liu Dong eon kim Center for Attosecond Science and Technology Department of PhysicsPohang University of Science and TechnologyPohangGyeongbuk37673Korea Max Planck POSTECH/KOREA Research Initiative PohangGyeongbuk37673Korea State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsInnovation Academy for Precision Measurement Science and TechnologyChinese Academy of Sciences430071WuhanChina Wuhan Institute of Quantum Technology 430206WuhanChina

Strong-field photoelectron holography is promising for the study of electron dynamics and structure in atoms and molecules,with superior spatiotemporal resolution compared to conventional electron and X-ray ***,the application of strong-field photoelectron holography has been hindered by inter-cycle interference from multicycle ***,we address this challenge by employing a near-single-cycle field to suppress the inter-cycle *** observed and separated two distinct holographic patterns for the first *** measurements allow us not only to identify the Gouy phase effect on electron wavepackets and holographic patterns but also to correctly extract the internuclear separation of the target molecule from the holographic *** work leads to a leap jump from theory to application in the field of strong-field photoelectron holography-based ultrafast imaging of molecular structures.

关键词： photoelectron holographic cycle

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PIF1 Regulates Plastid Development by Repressing Photosynthetic Genes in the Endodermis

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Molecular Plant 2016年第10期9卷 1415-1427页

作者： Keunhwa kim Jinkil Jeong Jeongheon kim Nayoung Lee Mi eon kim Sangil Lee Sun Chang kim Giltsu Choi Department of Biological Sciences Korea Advanced Institute of Science and Technology (KAIST) Daejeon 305-701 Republic of Korea Center for Gas Analysis Division of Metrology for Quality of Life Korea Research Institute of Standards and Science (KRISS) Daejeon 305-340 Republic of Korea

Mutations in Phytochrome Interacting Factors （PIFs） induce a conversion of the endodermal amyloplasts necessary for gravity sensing to plastids with developed thylakoids accompanied by abnormal activation of photosynthetic genes in the dark. In this study, we investigated how PIFs regulate endodermal plastid development by performing comparative transcriptome analysis. We show that both endodermal expression of PIF1 and global expression of the PIF quartet induce transcriptional changes in genes enriched for nuclear-encoded photosynthetic genes such as LHCA and LHCB. Among the 94 shared differentially expressed genes identified from the comparative transcriptome analysis, only 14 genes are demonstrated to be direct targets of PIF1, and most photosynthetic genes are not. Using a co-expression analysis, we identified a direct target of PIF, whose expression pattern shows a strong negative correlation with many photo- synthetic genes. We have named this gene REPRESSOR OF PHOTOSYNTHETIC GENES1 （RPGE1）. Endodermal expression of RPGE1 rescued the elevated expression of photosynthetic genes found in the pff quadruple （pifQ） mutant and partly restored amyloplast development and hypocotyl negative gravitropism. Taken together, our results indicate that RPGE1 acts downstream of PIF1 in the endodermis to repress photosynthetic genes and regulate plastid development.

关键词： phytochrome PIF1 hypocotyl negative gravitropism photosynthetic gene

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Endoscopic submucosal dissection for early gastric cancer:It is time to consider the quality of its outcomes

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World Journal of Gastroenterology 2023年第43期29卷 5800-5803页

作者： Gwang ha kim Internal Medicine Pusan National University School of Medicine and Biomedical Research InstitutePusan National University HospitalBusan 47241South Korea

Endoscopic resection,particularly endoscopic submucosal dissection(ESD),is widely used as a standard treatment modality for early gastric cancer(EGC)when the risk of lymph node metastasis is *** with surgical gastrectomy,ESD is a minimally invasive procedure with additional advantages,such as preservation of the entire stomach and maintenance of the patient’s quality of ***,not all patients achieve curative resection after ESD of *** patients require surgical gastrectomy after ESD to achieve a curative *** surgery after ESD,owing to non-curative resection,places considerable emotional and financial burdens on ***,as the number of endoscopists performing ESD has increased,the rate of non-curative resection after ESD has increased *** order to decrease the non-curative resection rate,as well as determine the ideal rate of non-curative resection after ESD,it is time to consider quality indicators for the outcomes of ESD for EGC.

关键词： Early gastric cancer Endoscopic resection Quality indicator

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A nanofilter composed of carbon nanotube-silver composites for virus removal and antibacterial activity improvement

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Journal of Environmental Sciences 2016年第4期28卷 275-283页

作者： Jun Pyo kim Jae ha kim Jieun kim Soo No Lee han-Oh Park Nano Development Team Bioneer Corporation Daejeon 306-220 Republic of Korea

We have developed a new nanofilter using a carbon nanotube-silver composite material that is capable of efficiently removing waterborne viruses and *** nanofilter was subjected to plasma surface treatment to enhance its flow rate,which was improved by approximately 62%.Nanoscale pores were obtained by fabricating a carbon nanotube network and using nanoparticle fixation technology for the removal of *** pore size of the nanofilter was approximately 38 nm and the measured flow rate ranged from 21.0 to 97.2 L/（min·m^2）under a pressure of 1–6 kgf/cm^2 when the amount of loaded carbon nanotube-silver composite was 1.0 mg/cm^*** nanofilter was tested against Polio-,Noro-,and Coxsackie viruses using a sensitive real-time polymerase chain reaction assay to detect the presence of viral particles within the *** trace of viruses was found to flow through the nanofilter with carbon nanotube-silver composite loaded above 0.8 mg/cm^***,the surface of the filter has antibacterial properties to prevent bacterial clogging due to the presence of 20-nm silver nanoparticles,which were synthesized on the carbon nanotube surface.

关键词： Carbon nanotube Silver nanoparticle Virus removal Nanofilter Water purification

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