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A Simple Configuration for 40 Gbit/s CSRZ Signal Generation with Electrical Band-Limiting to Achieve Large Dispersion Tolerance

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光学学报 2003年第S1期23卷 643-644页

作者： Dong-Soo lee Man seop lee Ampalavanapillai Nirmalathas OIRC Information and Communications University 58-4 Hwaam Yuseong Daejeon 305-732 KoreaOIRC Information and Communications University 58-4 Hwaam Yuseong Daejeon 305-732 KoreaAustralian Photonics Cooperative Research Centre Photonics Research Laboratory Department of Electrical and Electronic Engineering The University of Melbourne Victoria 3010 Australia

We present a novel configuration for carrier suppressed return-to-zero (CSRZ) signal generation, which only requires a single stage Mach-Zehnder (MZ) modulator in conjunction with an electrical mixer. Electrical band-limiting is also introduced to increase dispersion tolerance without causing additional penalty due to nonlinear effects in long haul dense wavelength division multiplexed (DWDM) CSRZ systems using conventional launch power levels.

关键词： CSRZ EB LPF on A Simple Configuration for 40 Gbit/s CSRZ Signal Generation with Electrical Band-Limiting to Achieve Large Dispersion Tolerance NRZ for with

Advances in the surface modification techniques of bone-related implants for last 10 years

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Regenerative Biomaterials 2014年第1期1卷 67-79页

作者： Zhi-Ye Qiu Cen Chen Xiu-Mei Wang in-seop lee Institute for Regenerative Medicine and Biomimetic Materials School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Beijing Allgens Medical Science and Technology Co. LtdBeijing 100176China Bio-X Center School of Life ScienceZhejiang Sci-Tech UniversityHangzhou 310018China Institute of Natural Sciences Yonsei UniversitySeoul 120-749Korea

At the time of implanting bone-related implants into human body,a variety of biological responses to the material surface occur with respect to surface chemistry and physical *** commonly used biomaterials(*** and its alloy,Co–Cr alloy,stainless steel,polyetheretherketone,ultra-high molecular weight polyethylene and various calcium phosphates)have many drawbacks such as lack of biocompatibility and improper mechanical *** surface modification is very promising technology to overcome such problems,a variety of surface modification techniques have been being *** review paper covers recent advances in surface modification techniques of bone-related materials including physicochemical coating,radiation grafting,plasma surface engineering,ion beam processing and surface patterning *** contents are organized with different types of techniques to applicable materials,and typical examples are also described.

关键词： surface modification physicochemical coating radiation grafting plasma surface engineering ion beam processing surface patterning bone-related materials

Characterization of Micro-arc Oxidized Titanium

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Journal of Wuhan University of Technology(Materials Science) 2005年第B12期20卷 178-180页

作者： Inho Han Jai Hyuk Choi Bao Hong Zhao Hong Koo Baik in-seop lee Department of Metallurgical Engineering Yonsei University Seoul 120-749 Korea Atomic-scale Surface Science Research Center Yonsei University Seoul 120-749 Korea Institute of Physics ＆ Applied Physics Yonsei University Seoul 120-749 Korea

The observation of the sparkling discharges during the micro-arc oxidation process in KOH aqueous electrolyte was achieved. The change of surface morphology was progressively observed and a plausible pore formation mechanism is proposed. Cell proliferation and ALP activity of micro- arc oxidized titanium was evaluated by human body derived osteoblasts and sligtaly better than those of blasted surface.

关键词： Micro-arc oxidation titanium oxide dental implant morphology

3D printed porous titanium filled with mineralized UV-responsive chitosan hydrogel promotes cell proliferation and osteogenesis in vitro

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Journal of Materials Science & Technology 2023年第11期142卷 34-44页

作者： Jiazhao Yang Fan Liu Changshun Zhou Hejie Li Gaolin Yang Shiyuan Fang in-seop lee Yi Liu Hao Bai Cen Chen The First Affiliated Hospital of USTC Division of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefei 230001China Department of Orthodontics School of StomatologyChina Medical UniversityShenyang 110002China College of Life Sciences and Medicine Zhejiang Sci-Tech UniversityHangzhou 310018China Institute of Laser Advanced Manufacturing Zhejiang University of TechnologyHangzhou 310023China Institute of Human Materials Suwon 16514Republic of Korea State Key Laboratory of Chemical Engineering College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027China Zhejiang Provincial Key Laboratory of Silkworm Bioreactor and Biomedicine Hangzhou 310018China

The modification of 3D printed porous titanium(Ti),especially for the internal pore structure,is critical and has received more attention to promoting its osteogenesis for clinical ***-violet(UV)responsive chitosan(CSMA),as an injectable filling material,was firstly incorporated into porous Ti,and then CSMA was in-situ mineralized by carbon oxide(CO_(2))diffusion(CSMA/CaCO_(3)).Their physical-chemical and biological properties were investigated in ***_(3) crystals within CSMA hydrogels were successfully deposited into pores of porous Ti,which exhibited favorable *** implants filled with CSMA/CaCO_(3) promoted adhesion and proliferation of bone mesenchymal stem cells(BMSCs).Moreover,Ti implant filled CSMA/CaCO_(3) hydrogels could increase alkaline phosphatase(ALP)activities,up-regulate osteopontin(OPN)and osteocalcin(OCN)expression levels,and enhance extracellular mineralization.3D printed porous Ti filled with mineralized UV-responsive chitosan hydrogel could promote proliferation and osteogenesis of BMSCs,and have great potential for the modification of porous Ti implants in bone tissue engineering.

关键词： Porous titanium Chitosan Ultraviolet(UV)-responsive Mineralization Osteogenesis

Influence of dehydrating agents on the oxidative carbonylation of methanol for dimethyl carbonate synthesis over a Cu/Y-zeolite catalyst

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Chinese Journal of Chemical Engineering 2018年第5期26卷 1059-1063页

作者： Dong-Ho lee Jiin You Je-Min Woo Jung Yoon Seo Young Cheol Park Jong-seop lee Hyunuk Kim Jong-Ho Moon Seung Bin Park Greenhouse Gas Laboratory Korea Institute of Energy Research Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology Energy Material Laboratory Korea Institute of Energy Research

The influence of the dehydration by metal oxides on the synthesis of dimethyl carbonate （DMC） via oxidative carbonylation of methanol was studied. A Cu/Y-zeolite catalyst was prepared by the ion exchange method from CuCl2.2H2O and the commercial NH4-form of the Y type zeolite, The catalyst was characterized by X-ray fluorescence （XRF）, N2 adsorption （BET method）, X-ray diffraction （XRD）, and temperature-programmed de- sorption of ammonia （NH3-TPD） to evaluate its Cu and Cl content, surface area, structure, and acidity. Reaction tests were carried out using an autoclave （batch reactor） for 18 h at 403 K and 5.5 MPa （2CH3OH ＋ 1/2O2 ＋ CO （CH3O）2CO ＋ H2O）. The influence of various dehydrating agents （ZnO, MgO, and CaO） was examined with the aim of increasing the methanol conversion （XMeOH, MeOH conversion）. The MeOH conversion increased upon addition of metal oxides in the order CaO 〉〉 MgO 〉 ZnO, with the DMC selectivity （SDMC） following the order MgO 〉 CaO 〉 ZnO. The catalysts and dehydrating agents were characterized before and after the oxidative carbonylation of methanol by thermogravimetric and differential thermogravimetric （TG/DTG）, and XRD to con- firm that the dehydration reaction occurred via the metal oxide （MO ＋ H2O →M（OH）2）. The MeOH conversion increased from 8.7% to 14.6% and DMC selectivity increased from 39.0% to 53.1%, when using the dehydrating azent CaO.

关键词： Carbon monoxide Zeolite Catalyst Dimethyl carbonate Oxidative carbonylation Dehydrating agent

Additional Sensitivity Penalty of Burst Mode Receivers in Ethernet PON due to Extinction Ratio

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光学学报 2003年第S1期23卷 647-648页

作者： Sub Han Ja-Won Seo Tae-Whan Yoo Man-seop lee Information and Communications University (ICU) 58-4 Hwaam-Dong Yuseong-Gu Daejeon 305-732 KOREAInformation and Communications University (ICU) 58-4 Hwaam-Dong Yuseong-Gu Daejeon 305-732 KOREAElectronics and Telecommunications Research Institute (ETRI)Information and Communications University (ICU) 58-4 Hwaam-Dong Yuseong-Gu Daejeon 305-732 KOREA

An additional sensitivity penalty of burst mode receivers due to the extinction ratio is analyzed considering the specific transmitter control in Ethernet PON. For an extinction ratio of 6dB, a penalty of 8dB occurs a... 详细信息

关键词： PON of Additional Sensitivity Penalty of Burst Mode Receivers in Ethernet PON due to Extinction Ratio in

PMMA基底含氢非晶碳膜的结构和摩擦学性能

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材料研究学报 2008年第4期22卷 429-432页

作者：蔺增李明吕少波林铁源巴德纯 in-seop lee 东北大学真空与流体工程研究中心沈阳110004 塑性成形模拟及模具技术国家重点实验室武汉430074 Institute of Physics ＆ Applied Physics and Atomic-scale Surface Science Research CenterYonsei University Seoul 120-752

分别用磁控溅射和等离子体增强化学气相沉积方法在PMMA基底上沉积硅膜和含氢非晶碳(a-C:H)膜.用氩离子溅射硅靶制备硅膜,以甲烷和氢气为反应气体在不同自偏压下制备非晶碳膜.分别用原子力显微镜、X射线光电子能谱和紫外拉曼光谱表征薄... 详细信息

分别用磁控溅射和等离子体增强化学气相沉积方法在PMMA基底上沉积硅膜和含氢非晶碳(a-C:H)膜.用氩离子溅射硅靶制备硅膜,以甲烷和氢气为反应气体在不同自偏压下制备非晶碳膜.分别用原子力显微镜、X射线光电子能谱和紫外拉曼光谱表征薄膜的形貌和结构,并分别用纳米压痕仪和栓盘摩擦磨损试验机测试其机械和摩擦学性能.结果表明,沉积碳膜的PMMA基底呈现出高硬度、低摩擦系数和低磨损率的特性.碳膜的显微结构、机械和摩擦学特性均显著依赖薄膜沉积过程中使用的自偏压,其摩擦系数和磨损率与其硬度和sp^3含量密切相关.

关键词：无机非金属材料含氢非晶碳膜等离子体增强化学气相沉积 PMMA 自偏压硬度摩擦学性能

Strength and fatigue properties of three-step sintered dense nanocrystal hydroxyapatite bioceramics

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Frontiers of Materials Science 2013年第2期7卷 190-195页

作者： Wen-Guang GUO Zhi-Ye QIU Han CUI Chang-Ming WANG Xiao-Jun ZHANG in-seop lee Yu-Qi DONG Fu-Zhai CUI School of Materials Science and Engineering Tsinghua University Beijing 100084 China Beijing AIIgens Medical Science and Technology Co. Ltd. Beijing 100085 China Institute of Natural Science and Atomic-scale Surface Science Research Center Yonsei University Seoul 120-749 Korea Department of Orthopedics Renji Hospital Affiliated with Shanghai Jiao Tong University School of Medicine Shanghai 200127 China

Dense hydroxyapatite （HA） ceramic is a promising material for hard tissue repair due to its unique physical properties and biologic properties. However, the brittleness and low compressive strength of traditional HA ceramics limited their applications, because previous sintering methods produced HA ceramics with crystal sizes greater than nanometer range. In this study, nano-sized HA powder was employed to fabricate dense nanocrystal HA ceramic by high pressure molding, and followed by a three-step sintering process. The phase composition, microstructure, crystal dimension and crystal shape of the sintered ceramic were examined by X-ray diffraction （XRD） and scanning electron microscopy （SEM）. Mechanical properties of the HA ceramic were tested, and cytocompatibility was evaluated. The phase of the sintered ceramic was pure HA, and the crystal size was about 200 nm. The compressive strength and elastic modulus of the HA ceramic were comparable to human cortical bone, especially the good fatigue strength overcame brittleness of traditional sintered HA ceramics. Cell attachment experiment also demonstrated that the ceramics had a good cytocompatibility.

关键词： nanocrystal hydroxyapatite ceramic three-step sintering mechanicalproperty fatigue strength cytocom patibility

Outdoor cultivation of microalgae in a coal-fired power plant for conversion of flue gas CO_(2)into microalgal direct combustion fuels

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Systems Microbiology and Biomanufacturing 2021年第1期1卷 90-99页

作者： Young Joon Sung Jeong seop lee Hong Ki Yoon Hyunjin Ko Sang Jun Sim Department of Chemical and Biological Engineering Korea University145Anam-roSeongbuk-guSeoul 02841Republic of Korea Korea Western Power Co. Ltd.285Jungang-roTaean-eupTaean-gunChungcheongnam-do 32140Republic of Korea

Microalgae have piqued renewed interest as a sustainable biofuel feedstock owing to their high CO_(2)conversion ***,the major limitation of microalga-based biofuel production is low *** this study,CO_(2)in flue gas emitted from the coal-fired power plants was fixed through mass microalgal cultivation using only sunlight as an energy *** minimize the cost and energy required to supply the flue gas and efficiently utilize the microalgal biomass,a polycarbonate(PC)greenhouse and polymeric photobioreactors were installed near the power plant *** different microalgal strains(Chlamydomonas reinhardtii,Chlorella sorokiniana,Neochloris oleoabundans,and Neochloris oleoabundans#13)were subjected to semi-continuous culturing for 1 *** maximum biomass productivity was achieved by the ***-dans#13 strain(0.703 g L^(−1)day^(−1)).Additionally,polymerase chain reaction analysis revealed that the individual microalgal culture was not cross-contaminated with other microalgal cultures in this cultivation system,owing to the structural proper-ties of photobioreactor comprising individual *** lipid content and calorific productivity of ***#13 biomass were 45.70%and 3.553 kJ L^(−1)day^(−1),respectively,which indicate satisfactory performance of biomass as a direct combustion *** CO_(2)fixation rate,which was calculated based on the carbon content in the biomass,was 0.309 g CO_(2)L^(−1)day^(−1).Therefore,large amounts of CO_(2)can be reduced using the large-scale microalgal cultivation system,which enables efficient biological CO_(2)conversion and maximizes microalgal biomass utilization.

关键词： Microalgae Coal-fired power plant CO_(2)conversion process Direct combustion fuel