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High Differential Group Index of Dispersion Compensating Fibers for OCDMA Encoder/Decoder

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光学学报 2003年第S1期23卷 221-222页

作者： Tae-Jung Eom Chang-Soo Park un-chul paek Byeong Ha Lee Taesang Park Department of Information and Communications Kwangju Institute of Science and Technology1 Oryong-dong Buk-gu Gwangju KoreaDepartment of Information and Communications Kwangju Institute of Science and Technology1 Oryong-dong Buk-gu Gwangju KoreaDepartment of Information and Communications Kwangju Institute of Science and Technology1 Oryong-dong Buk-gu Gwangju KoreaDepartment of Information and Communications Kwangju Institute of Science and Technology1 Oryong-dong Buk-gu Gwangju KoreaKT corp. 463-1 Jeonmin-dong Yusung-gu Daejeon Korea

We report the LPG pair device that can be used as a pulse duplicator or an OCDMA encoder/decoder. Due to the ring core region of dispersion compensating fiber (DCF), we can shorten the device length by a third and obt... 详细信息

关键词： OCDMA be in on DCF High Differential Group Index of Dispersion Compensating Fibers for OCDMA Encoder/Decoder mode of for

Heat Treatment of the Photonic Crystal Fiber

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光学学报 2003年第S1期23卷 80-81页

作者： Joo Beom Eom Seongwoo Yoo Jinchae Kim Hokyung Kim un-chul paek Byeong Ha Lee Department of Information and Communications Kwangju Institute of Science and Technologyl Oryong-dong Buk-gu Gwangju 500-712 KoreaDepartment of Information and Communications Kwangju Institute of Science and Technologyl Oryong-dong Buk-gu Gwangju 500-712 KoreaDepartment of Information and Communications Kwangju Institute of Science and Technologyl Oryong-dong Buk-gu Gwangju 500-712 KoreaDepartment of Information and Communications Kwangju Institute of Science and Technologyl Oryong-dong Buk-gu Gwangju 500-712 KoreaDepartment of Information and Communications Kwangju Institute of Science and Technologyl Oryong-dong Buk-gu Gwangju 500-712 KoreaDepartment of Information and Communications Kwangju Institute of Science and Technologyl Oryong-dong Buk-gu Gwangju 500-712 Korea

We report heat treatment of the photonic crystal fiber. As the temperature was increased, the transmission of the photonic crystal fiber was increased, unlike conventional single mode fiber. The transmission increase at short wavelength region was larger than long wavelength region for the various temperatures. After crystallization of the silica glass, the spectra of the photonic crystal fiber were just decreased at all wavelength regions, but, in case of the single mode fiber, the absorption in visibl...

关键词： of on in be PCF mode Heat Treatment of the Photonic Crystal Fiber

Methane Emission from Rice Fields:Necessity for Molecular Approach for Mitigation

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Rice science 2024年第2期31卷 159-178页

作者： Sujeevan RAJENDRAN Hyeonseo PARK Jiyoung KIM Soon Ju PARK Dongjin SHIN Jong-Hee LEE Young Hun SONG Nam-Chon paek chul Min KIM Department of Horticulture Industry Wonkwang UniversityIksan 54538Korea Plant Molecular Biology and Biotechnology Research Center Gyeongsang National UniversityJinju 52828Korea Department of Southern Area Crop Science National Institute of Crop ScienceMiryang 50424Korea Department of Agricultural Biotechnology Seoul National UniversitySeoul 08826Korea Department of Plant Science Plant Genomics and Breeding InstituteResearch Institute of Agriculture and Life SciencesSeoul National UniversitySeoul 08826Korea

Anthropogenic methane emissions are a leading cause of the increase in global averagetemperatures,often referred to as global warming.Flooded soils play a significant role in methaneproduction,where the anaerobic conditions promote the production of methane by methanogenicmicroorganisms.Rice fields contribute a considerable portion of agricultural methane emissions,as riceplants provide both factors that enhance and limit methane production.Rice plants harbor both methaneproducingand methane-oxidizing microorganisms.Exudates from rice roots provide source for methaneproduction,while oxygen delivered from the root aerenchyma enhances methane oxidation.Studies haveshown that the diversity of these microorganisms depends on rice cultivars with some genes characterizedas harboring specific groups of microorganisms related to methane emissions.However,there is still aneed for research to determine the balance between methane production and oxidation,as rice plantspossess the ability to regulate net methane production.Various agronomical practices,such as fertilizerand water management,have been employed to mitigate methane emissions.Nevertheless,studiescorrelating agronomic and chemical management of methane with productivity are limited.Moreover,evidences for breeding low-methane-emitting rice varieties are scattered largely due to the absence ofcoordinated breeding programs.Research has indicated that phenotypic characteristics,such as rootbiomass,shoot architecture,and aerenchyma,are highly correlated with methane emissions.This reviewdiscusses available studies that involve the correlation between plant characteristics and methaneemissions.It emphasizes the necessity and importance of breeding low-methane-emitting rice varieties inaddition to existing agronomic,biological,and chemical practices.The review also delves into the idealphenotypic and physiological characteristics of low-methane-emitting rice and potential breeding techniques,drawing from studies conducted with diverse varieties,mutants,and transgenic p

关键词： methane emission rice breeding aerenchyma greenhouse gas radial oxygen loss

Rice ONAC016 promotes leaf senescence through abscisic acid signaling pathway involving OsNAP

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The Crop Journal 2024年第3期12卷 709-720页

作者： Eunji Gi Sung-Hwan Cho Suk-Hwan Kim Kiyoon Kang Nam-Chon paek Department of Agriculture Forestry and BioresourcesPlant Genomics and Breeding InstituteResearch Institute of Agriculture and Life SciencesSeoul National UniversitySeoul 08826Republic of Korea Division of Life Sciences Incheon National UniversityIncheon 22012Republic of Korea

Senescence-induced NAC(senNAC)TFs play a crucial role in senescence during the final stage of leaf development.In this study,we identified a rice senNAC,ONAC016,which functions as a positive regulator of leaf senescence.The expression of ONAC016 increased rapidly in rice leaves during the progression of dark-induced and natural senescence.The onac016-1 knockout mutant showed a delayed leaf yellowing phenotype,whereas the overexpression of ONAC016 accelerated leaf senescence.Notably,ONAC016 expression was upregulated by abscisic acid(ABA),and thus detached leaves of the onac016-1 mutant remained green much longer under ABA treatment.Quantitative RT-PCR analysis showed that ONAC016 upregulates the genes associated with chlorophyll degradation,senescence,and ABA signaling.Yeast one-hybrid and dual-luciferase assays revealed that ONAC016 binds directly to the promoter regions of OsNAP,a key gene involved in chlorophyll degradation and ABA-induced senescence.Taken together,these results suggest that ONAC016 plays an important role in promoting leaf senescence through the ABA signaling pathway involving OsNAP.

关键词： Rice ONAC016 OsNAP Leaf senescence Abscisic acid signaling

Wearable and stretchable conductive polymer composites for strain sensors:How to design a superior one?

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Nano Materials Science 2023年第4期5卷 392-403页

作者： Liwei Lin Sumin Park Yuri Kim Minjun Bae Jeongyeon Lee Wang Zhang Jiefeng Gao Sun Ha paek Yuanzhe Piao Department of Applied Bioengineering Graduate School of Convergence Science and TechnologySeoul National UniversitySeoul08826South Korea Department of Neurosurgery Movement Disorder CenterSeoul National University HospitalHypoxia/Ischemia Disease InstituteCancer Research InstituteSeoul National University College of MedicineSeoul03080South Korea School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhouJiangsu225002China Institute of Textiles and Clothing The Hong Kong Polytechnic UniversityHung HomHong Kong SAR999077China Advanced Institutes of Convergence Technology 145 Gwanggyo-roYeongtong-guSuwon-siGyeonggi-do443-270South Korea

Wearable and stretchable strain sensors have potential values in the fields of human motion and health monitoring,flexible electronics,and soft robotic skin.The wearable and stretchable strain sensors can be directly attached to human skin,providing visualized detection for human motions and personal healthcare.Conductive polymer composites(CPC)composed of conductive fillers and flexible polymers have the advantages of high stretchability,good flexibility,superior durability,which can be used to prepare flexible strain sensors with large working strain and outstanding sensitivity.This review has put forward a comprehensive summary on the fabrication methods,advanced mechanisms and strain sensing abilities of CPC strain sensors reported in recent years,especially the sensors with superior performance.Finally,the structural design,bionic function,integration technology and further application of CPC strain sensors are prospected.

关键词： Wearable strain sensors Conductive polymer composites Mechanism Sensing performance

Advanced flexible humidity sensors:structures,techniques,mechanisms and performances

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Frontiers of Materials Science 2023年第4期17卷 37-53页

作者： Yuzhe Zhang Yuxi Liu Lifei Lin Man Zhou Wang Zhang Liwei Lin Zhongyu Li Yuanzhe Piao Sun Ha paek School of Environmental Science and Engineering Changzhou UniversityChangzhou 213164China Department of Applied Bioengineering Graduate School of Convergence Science and TechnologySeoul National UniversitySeoul 08826Republic of Korea Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology School of Petrochemical EngineeringChangzhou UniversityChangzhou 213164China College of Chemistry and Molecular Sciences Wuhan UniversityWuhan 430072China Department of Neurosurgery Movement Disorder CenterSeoul National University HospitalSeoul 03080Republic of Korea Advanced Institutes of Convergence Technology Suwon-siGyeonggi-do 16229Republic of Korea

Flexible humidity sensors are widely used in many fields,such as environmental monitoring,agricultural soil moisture content determination,food quality monitoring and healthcare services.Therefore,it is essential to measure humidity accurately and reliably in different conditions.Flexible materials have been the focusing substrates of humidity sensors because of their rich surface chemical properties and structural designability.In addition,flexible materials have superior ductility for different conditions.In this review,we have summarized several sensing mechanisms,processing techniques,sensing layers and substrates for specific humidity sensing requirements.Aadditionally,we have sorted out some cases of flexible humidity sensors based on different functional materials.We hope this paper can contribute to the development of flexible humidity sensors in the future.

关键词： flexible composite manufacturing technology sensing mechanism humidity sensor

《双减》政策下中小青少儿英语培训企业的战略调整——以H英语培训机构为例

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《双减》政策下中小青少儿英语培训企业的战略调整——以H英语培...

作者： paek Ryo Yong 北京外国语大学

学位级别：硕士

近年来,由于校外培训机构引发的一系列社会争议,政府经各方面考虑,自2018年开始颁布校外培训机构收紧政策,并在2021年7月颁布了《关于进一步减轻义务教育阶段学生作业负担和校外培训负担的意见》(以下简称《双减》)。因《双减》政策的... 详细信息

近年来,由于校外培训机构引发的一系列社会争议,政府经各方面考虑,自2018年开始颁布校外培训机构收紧政策,并在2021年7月颁布了《关于进一步减轻义务教育阶段学生作业负担和校外培训负担的意见》(以下简称《双减》)。因《双减》政策的遏制对象为K12教育,以K12教育为主营业务的企业纷纷进行战略转型,而业务手段和形式受到部分影响的中小企业选择战略改革和调整。本文以艰难度过《双减》的中型青少儿英语培训企业H公司为分析案例,深度剖析该企业《双减》前后的战略调整与其效果,并通过分析五个业务板块的表现提供各板块的未来战略发展建议。本文的研究模型为SCP模型和GE矩阵。SCP模型通过行业结构、企业行为、企业绩效,分析政策突变下的企业战略行为达到的效果。GE矩阵适用于公司制定成长战略,对选取的现有业务单元进行产业吸引力与自身业务实力两个维度上的分析,判断强项和弱项,并做出决策。首先,本文基于SCP模型,分析在《双减》的政策冲击下行业层面的结构变化以及应对此变化的企业战略行为变化,并通过企业绩效数据来判断企业所采取的战略行为是否有助于提高绩效。公司在业务调整方面,《双减》初期放弃了政策所限制的小班课,把资源投入到大班课及素养课的业务扩张改善上,始终保持稳定价格的同时以独特的课后指导满足客户的需求。在产品方面,H公司加强原有板块,开拓新板块,以产品为媒介保住现金流。在品牌营销方面,H公司拒绝做推销广告,把有限的资源用在教学水平提升和服务改善上。绩效分析结果显示,公司战略调整后订单量与收入逐渐增多,2022年上半年的收益达到《双减》后半年的2.35倍,再次证实了公司战略调整的有效性。之后,本文选取企业未来可扩张的五个业务板块,基于GE矩阵进行定量分析,通过分析结果给出各板块未来发展战略建议。本文提出的战略建议为:公司接下来的发展中,应把课后指导作为公司的主要投入板块,继续保持其订单驱动作用,提升主业务的附加值;视频课程、素养课以及冬夏令营目前既符合政策要求,销量也达标,可适当扩张;建议公司放弃对教育用品业务的投资。本文的意义和创新点在于结合SCP模型和GE矩阵分析了《双减》政策下H公司的战略调整,分析在政策限制下使企业生存的主要因素,并为处于类似困境的企业提供可借鉴的经验和战略建议。

关键词：《双减》政策青少儿英语培训机构战略调整

麦尔维尔中篇小说《贝尼托·塞雷诺》中的奴隶贸易和人道主义

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外国文学研究 2022年第5期44卷 14-30页

作者：白埈杰韩国梨花女子大学

本文追踪麦尔维尔中篇小说《贝尼托·塞雷诺》中很少被人研究过的奴隶贸易的含义。通过对人性和人道主义的历史和理论追踪溯源,本文指出德拉诺不仅认同南方不连贯的、类似人道主义的奴隶监护逻辑,而且拥护奴隶贸易的非人性化条款,以便... 详细信息

本文追踪麦尔维尔中篇小说《贝尼托·塞雷诺》中很少被人研究过的奴隶贸易的含义。通过对人性和人道主义的历史和理论追踪溯源,本文指出德拉诺不仅认同南方不连贯的、类似人道主义的奴隶监护逻辑,而且拥护奴隶贸易的非人性化条款,以便克服因奴隶复活其人性施为而造成的精神危机。结果,尽管巴波精心致力于恢复人的个性,但奴隶叛乱者最终还是悲惨地困入由德拉诺和种族奴隶制度为自身之便而动用的人性与非人性这两个相悖的模式之中。

关键词：麦尔维尔奴隶贸易人性人道主义人的个性

Lattice Boltzmann method for consolidation analysis of saturated clay

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Journal of Ocean Engineering and Science 2019年第3期4卷 193-202页

作者： Pyol Kim Yong-Gun Kim Chung-Hyok paek Jun Ma Faculty of Geology Kim Il Sung UniversityPyongyang 999093Democratic People’s Republic of Korea Faculty of Global Environmental Science Kim Il Sung UniversityPyongyang 999093Democratic People’s Republic of Korea

The lattice Boltzmann method(LBM)has been widely employed in various areas of practical engineering to solve non-linear problems,due to such advantages as the simplicity of programming and the numerical efficiency.In this paper,a new numerical method for onedimensional(1D)consolidation analysis of saturated clay is proposed on the basis of the lattice Boltzmann method.At first,the lattice Bhatnagar-Gross-Krook(LBGK)model is used for 1D consolidation problem of saturated clay subjected to time-dependent loading under different types of initial and boundary conditions.In addition,the multiscale Chapman-Enskog expansion is applied to recover mesoscopic lattice Boltzmann equation to macroscopic consolidation equation.As a result of the numerical simulation for verification,the numerical results are proved to be in good agreement with the analytical solutions available in previous literature.Through the evaluation of convergence and accuracy,it is demonstrated that the proposed method is more accurate and reliable than the finite difference method(FDM)for 1D consolidation analysis of saturated clay.

关键词： Saturated clay Lattice Boltzmann method Consolidation Time-dependent loading