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Electrically focus-tuneable ultrathin lens for high-resolution square subpixels

Light(Science & Applications) 2020年第1期9卷 1066-1078页

作者： Sehong park Gilho Lee Byeongho park Youngho Seo Chae bin park Young Tea Chun Chulmin Joo junsuk Rho Jong Min Kim James Hone Seong Chan jun School of Mechanical Engineering Yonsei University50 Yonsei-roSeodaemun-guSeoul 03722Republic of Korea Electrical Engineering Division Engineering DepartmentUniversity of Cambridge9 JJ Thomson AvenueCambridge CB3 OFAUK Department of Electronic Material Engineering Korea Maritime and Ocean UniversityBusan 49112Republic of Korea Department of Mechanical Engineering Pohang University of Science and Technology(POSTECH)77 Cheongam-roNam-guPohang 37673Republic of Korea Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)77 Cheongam-roNam-guPohang 37673Republic of Korea Institute for Convergence Research and Education in Advanced Technology Yonsei University50 Yonsei-roSeodaemun-guSeoul 03722Republic of Korea Department of Mechanical Engineering Columbia University500 West 120th StreetMudd 220New YorkNY 10027USA

Owing to the tremendous demands for high-resolution pixel-scale thin lenses in displays,we developed a graphenebased ultrathin square subpixel lens(USSL)capable of electrically tuneable focusing(ETF)with a performance competitive with that of a typical mechanical refractive *** fringe field due to a voltage bias in the graphene proves that our ETF-USSL can focus light onto a single point regardless of the wavelength of the visible light—by controlling the carriers at the Dirac point using radially patterned graphene layers,the focal length of the planar structure can be adjusted without changing the curvature or position of the lens.A high focusing efficiency of over 60% at a visible wavelength of 405 nm was achieved with a lens thickness of <13 nm,and a change of 19.42% in the focal length with a 9% increase in transmission was exhibited under a driving *** design is first presented as an ETF-USSL that can be controlled in pixel units of flat panel displays for visible *** can be easily applied as an add-on to high resolution,slim displays and provides a new direction for the application of multifunctional autostereoscopic displays.

关键词： visible driving competitive

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Effect of Doubling the Ensemble Size on the Performance of Ensemble Prediction in the Warm Season Using MOGREPS Implemented at the KMA

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Advances in Atmospheric Sciences 2013年第5期30卷 1287-1302页

作者： jun Kyung KAY Hyun Mee KIM Young-Youn park Joohyung SON Department of Atmospheric Sciences Yonsei University Korea Meteorological Administration

Using the Met Office Global and Regional Ensemble Prediction System （MOGREPS） implemented at the Korea Meteorological Administration （KMA）, the effect of doubling the ensemble size on the performance of ensemble prediction in the warm season was evaluated. Because a finite ensemble size causes sampling error in the full forecast probability distribution function （PDF）, ensemble size is closely related to the efficiency of the ensemble prediction system. Prediction capability according to doubling the ensemble size was evaluated by increasing the number of ensembles from 24 to 48 in MOGREPS implemented at the KMA. The initial analysis perturbations generated by the Ensemble Transform Kalman Filter （ETKF） were integrated for 10 days from 22 May to 23 june 2009. Several statistical verification scores were used to measure the accuracy, reliability, and resolution of ensemble probabilistic forecasts for 24 and 48 ensemble member forecasts. Even though the results were not significant, the accuracy of ensemble prediction improved slightly as ensemble size increased, especially for longer forecast times in the Northern Hemisphere. While increasing the number of ensemble members resulted in a slight improvement in resolution as forecast time increased, inconsistent results were obtained for the scores assessing the reliability of ensemble prediction. The overall performance of ensemble prediction in terms of accuracy, resolution, and reliability increased slightly with ensemble size, especially for longer forecast times.

关键词： ensemble prediction ensemble size ensemble transform Kalman filter

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Secondary endoscopic submucosal dissection for locally recurrent or incompletely resected gastric neoplasms

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World Journal of Gastroenterology 2018年第33期24卷 3776-3785页

作者： Da Hyun jung Young Hoon Youn Jie-Hyun Kim Jae jun park Hyojin park Department of Internal Medicine Gangnam Severance Hospital Yonsei University College of Medicine

AIM To investigate the feasibility and safety of secondary endoscopic submucosal dissection(ESD) for residual or locally recurrent gastric tumors. METHODS Between 2010 and 2017, 1623 consecutive patients underwent ESD for gastric neoplasms at a single tertiary referral center. Among these, 28 patients underwent secondary ESD for a residual or locally recurrent tumor. Our analysis compared clinicopathologic factors between primary ESD and secondary ESD groups. RESULTS The en bloc resection and curative rate of resection of secondary ESD were 92.9% and 89.3%, respectively. The average procedure time of secondary ESD was significantly longer than primary ESD(78.2 min vs 55.1 min, P = 0.004), and the adverse events rate was not significantly different but trended slightly higher in the secondary ESD group compared to the primary ESD group(10.7% vs 3.8%, P = 0.095). Patients who received secondary ESD had favorable outcomes without severe adverse events. During a mean follow-up period, no local recurrence occurred in patients who received secondary ESD. CONCLUSION Secondary ESD of residual or locally recurrent gastric tumors appears to be a feasible and curative treatment though it requires greater technical efficiency and longer procedure time.

关键词： Secondary endoscopic submucosal dissection Endoscopic submucosal dissection Gastric neoplasms Residual tumors Recurrent tumors

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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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Dynamics of ecosystems and anthropogenic drivers in the Yellow Sea Large Marine Ecosystem

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Acta Oceanologica Sinica 2022年第6期41卷 1-3页

作者： jun Sun Yinfeng Guo Gyung Soo park Andrew Hudson Institute for Advanced Marine Research China University of GeosciencesGuangzhou 511462China National Marine Hazard Mitigation Service Ministry of Natural ResourcesBeijing 100194China Department of Marine Biotechnology Anyang UniversityAnyang 14028R.O.Korea Bureau for Policy and Programme Support United Nations Development ProgrammeNew York 10017USA

In the developed world,governance of marine ecological environment is the important part of the national ecological and economic *** Yellow Sea is one of large marine ecosystems in the seas of East Asia,which is an extension of one of the largest continental shelf areas,and forms a huge but shallow sediment body in its south area which is geographically unique in the *** a region with the most fragile natural environment,unparalleled global ecological significance and the most urgent protection needs,the Yellow Sea ecological zone is becoming a common concern of countries around the Yellow Sea and beyond,such as tidal flats and the staging migratory birds(Murray et al.,2015).

关键词： shallow tidal shelf

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Study on the Confidentiality in International Commercial Arbitration

Study on the Confidentiality in International Commercial Arb...

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作者： park Hyung jun 中国政法大学

学位级别：硕士

虽然学界对于国际商事仲裁的保密性问题尚无定论,世界各国对于仲裁保密性问题的态度也各不相同,但是国际商事仲裁保密性问题的存在是毋庸置疑的。然而究竟什么是国际商事仲裁的保密性,它的价值何在,它的法律基础又是什么?这些都是值得... 详细信息

虽然学界对于国际商事仲裁的保密性问题尚无定论,世界各国对于仲裁保密性问题的态度也各不相同,但是国际商事仲裁保密性问题的存在是毋庸置疑的。然而究竟什么是国际商事仲裁的保密性,它的价值何在,它的法律基础又是什么?这些都是值得我们认真思考的问题。此外,由于保密义务是保密性问题的具体化,它的主要方面也体现了保密性的内涵,因此,保密义务在国际商事仲裁中发挥着举足轻重的作用。本文拟从国际商事仲裁保密性的法律性质,适用范围,主体,限制与例外,违反保密义务的救济措施,保密义务的执行及其在实践中的影响等角度对国际商事仲裁的保密性问题进行阐释,在此基础上提出如何完善当前的国际商事仲裁保密性制度的建议,从而满足当事人对国际商事仲裁的新需求并且发挥仲裁所具有的其它纠纷解决方式无法比拟的优势。遵循以上脉络,本文分四章进行阐述：第一章是国际商事仲裁保密性问题的概述。本章着重介绍了国际商事仲裁中保密性问题的基本概念。在厘清私人性与保密性关系的基础上分析国际商事仲裁保密性的现状并阐述了保密性在国际商事仲裁中的价值包括维护公共形象以及保护商业秘密和敏感信息。最后,分别从仲裁机构的规则和主权国家的法律两方面来讨论国际商事仲裁保密性的法律基础。第二章讨论了国际商事仲裁保密性的具体事项。本章主要涉及五个方面：第一,国际商事仲裁保密性的法律性质;第二,国际商事仲裁保密性的适用范围,包括仲裁的存在本身,与仲裁程序相关的资料和信息,仲裁裁决,仲裁庭的所有决定;第三,国际商事仲裁保密义务的主体;第四,国际商事仲裁保密义务的限制与例外;第五,违反保密义务的救济措施;第六,国际商事仲裁中保密义务的执行与期限。第三章主要分析了在实践中仲裁保密性的消极影响,仲裁的保密性不利于困际商事惯例的形成和仲裁的公正与高效,并妨碍公众获得信息。此外,本章还探讨了保密性制度的施行后果例如对双方当事人提供不平等的保护以及对双方当事人违反保密义务施加不同的影响,甚至挫伤当事人选择仲裁来解决纠纷的积极性。第四章提出了如何完善国际商事仲裁保密性制度的建议。本章共提出四条改良途径包括当事人在合同中约定,在仲裁机构的仲裁规则中加以规定,以及在内国法和国际条约中规定,并且分析了在国际商事仲裁中如何把握仲裁的保密性与透明性之间的平衡。在此基础上,提出了具有实践意义的保护仲裁保密性的建议。

关键词：国际商事仲裁的保密性影响及后果完善

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Mathematical Modeling of Cell Polarity Establishment of Budding Yeast

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Communications on Applied Mathematics and Computation 2024年第1期6卷 218-235页

作者： Yue Liu jun Xie Hay-Oak park Wing-Cheong Lo Department of Mathematics City University of Hong KongTat Chee AvenueKowloonHong KongChina Department of Molecular Genetics The Ohio State UniversityColumbusOHUSA

The budding yeast Saccharomyces cerevisiae is a powerful model system for studying the cell polarity *** cell polarization process is regulated by signaling molecules,which are initially distributed in the cytoplasm and then recruited to a proper location on the cell membrane in response to spatial cues or *** of these signaling molecules involves complex regulation,so the mathematical models become a useful tool to investigate the mechanism behind the *** this review,we discuss how mathematical modeling has shed light on different regulations in the cell *** also propose future applications for the mathematical modeling of cell polarization and morphogenesis.

关键词： Budding yeast Cdc42 Morphogenesis Septin Mathematical models

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Restoration of common bile duct diameter within 2 weeks after endoscopic stone retraction is a preventive factor for stone recurrence

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Hepatobiliary & Pancreatic Diseases International 2018年第3期17卷 251-256页

作者： Jin Jeon Sung Uk Lim Chang-Hwan park Chung-Hwan jun Seon-Young park Jong-Sun Rew Department of Internal Medicine Chonnam National University Hospital Department of Internal Medicine Mokpo Hankook Hospital

Background： Little information is available about the relationship between restoration of common bileduct （CBD） diameter after endoscopic stone retraction and recurrence of CBD stones in elderly *** present study was to determine whether restoration of CBD diameter is a preventive factor for CBDstone recurrence in elderly patients who underwent endoscopic retrograde cholangiopancreatography（ERCP）.

关键词： Restoration Common bile duct Endoscopic retrograde cholangiopancreatography Common bile duct stone

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Atomically thin heterostructure with gap-mode plasmon for overcoming trade-off between photoresponsivity and response time

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Nano Research 2021年第5期14卷 1305-1310页

作者： Khang june Lee Cheolmin park Hyeok jun Jin Gwang Hyuk Shin Sung-Yool Choi School of Electrical Engineering Center for Advanced Materials Discovery towards 3D DisplaysKorea Advanced Institute of Science and Technology291 Daehak-roYuseong-guDaejeon34141Republic of Korea

Two-dimensional(2D)materials have recently provided a new perspective on optoelectronics because of their unique layered structure and excellent physical ***,their potential use as optoelectric devices has been limited by the trade-off between photoresponsivity and response ***,based on a vertically stacked atomically thin p-n junction,we propose a gap-mode plasmon structure that simultaneously enables enhanced responsivity and rapid *** atomically thin 2D materials act as a spacer for enhancing the gap-mode plasmons,and their short transit length in the vertical direction allows fast photocarrier *** demonstrate a high responsivity of up to 8.67 A/W with a high operation speed that exceeds 35 MHz under a 30 nW laser *** photocurrent,absorption,and a numerical simulation are used to verify the effectiveness of the gap-mode plasmons in the *** believe that the design strategy proposed in this study can pave the way for a platform to overcome the trade-off between responsivity and response time.

关键词： atomically thin heterostructure gap-mode plasmons photodetectors high responsivity fast response time

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Amorphous BaTiO_(3) Electron Transport Layer for Thermal Equilibrium-Governed γ-CsPbl_(3) Perovskite Solar Cell with High Power Conversion Efficiency of 19.96%

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Energy & Environmental Materials 2024年第3期7卷 291-302页

作者： Changhyun Lee Chanyong Lee Kyungjin Chae Taemin Kim Seaeun park Yohan Ko Yongseok jun Department of Energy Environment Policy and Technology Graduate School of Energy and Environment(KU-KIST Green School)Korea UniversitySeoul 02841Republic of Korea Nano Electronic Materials and Components Research Center Gumi Electronics and Information Technology Research Institute(GERI)Gumi 39171Republic of Korea Energy Materials Research Center Clean Energy Research DivisionKorea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea

Compared to organic-inorganic hybrid perovskites,the cesium-based allinorganic lead halide perovskite(CsPbI_(3))is a promising light absorber for perovskite solar cells owing to its higher resistance to thermal ***,additional research is required to reduce the nonradiative recombination to realize the full potential of CsPbI_(3).Here,the diffusion of Cs ions participating in ion exchange is proposed to be an important factor responsible for the bulk defects inγ-CsPbI_(3)*** based on first-principles density functional theory reveal that the[PbI_(6)]^(4-)octahedral tilt modifies the perovskite crystallographic properties inγ-CsPbI_(3),leading to alterations in its bandgap and crystal *** addition,by substituting amorphous barium titanium oxide(a-BaTiO_(3))for TiO_(2)as the electron transport layer,interfacial defects caused by imperfect energy levels between the electron transport layer and perovskite are ***-resolution transmission electron microscopy and electron energy loss spectroscopy demonstrate that a-BaTiO_(3)forms entirely as a single phase,as opposed to Ba-doped TiO_(2)hybrid nanoclusters or separate domains of TiO_(2)and BaTiO_(3)***,inorganic perovskite solar cells based on the a-BaTiO_(3)electron transport layer achieved a power conversion efficiency of 19.96%.

关键词： amorphous BaTiO_(3) electron transport layer moisture γ-CsPbI_(3)

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