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Investigation of Domain Wall Velocity to External Fields for High-Quality Waveguide-Type Periodically Poled LiNbO_(3) Fabrication

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Journal of Rare Earths 2006年第z1期24卷 131-135页

作者： Soo Woo Kwon Woo Seok Yang H M Lee Woo Kyung kim Hang Yong Lee Dae Ho Yoon Yo Seung Song Department of Materials Engineering Hankuk Aviation UniversityGoyang 412-791Korea Nano Bio-Photonics Team Korea Electronics Technology InstituteBundang 463-816Korea Department of Advanced Material Engineering Sungkyunkwan UniversitySuwon 440-746Korea

The Ti-doped waveguide-type periodically poled LiNbO_(3)(PPLN)were fabricated and the dependence of domain wall velocity on an external field applied for domain inversion was *** whole polarization reversal process was computer-controlled to regulate domain wall expansion at a feedback time shorter than 5μ*** coercive voltage and several values of excess voltage were applied on 500μm-thick wafers serially connected to a 1-MOhm external resistor which had an effect of the poling current reduction,*** deceleration of domain wall *** domain wall velocity is sensitive to the poling voltage,precisely speaking,to the excess *** domain wall velocities were 28.70,16.02 and 5.75μm·s^(-1)under poling field of 23.5,22.0 and 21.0 kV·mm^(-1),***,average duty cycle of PPLN is about 49.93%.

关键词： periodically poled lithium niobate coerciv field duty cycle domain wall velocity quasi phase matching

Investigation of the CO<sub>2</sub>Sequestration by Indirect Aqueous Carbonation of Waste Cement

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American Journal of Climate Change 2017年第1期6卷 132-150页

作者： Myoungwook Mun Heechan Cho Jihoe Kwon Kihong kim Rina kim Department of Energy Resources Engineering Seoul National University Seoul Republic of Korea

Mineral carbonation of CO2 with fine-grained waste cement was investigated using NH4Cl as a recyclable extracting agent. The amount of calcium extracted with NH4Cl was not as high as with more commonly used extraction agents such as HCl and CH3COOH. NH4Cl also exhibited high selectivity in the calcium extraction process, such that calcium ions comprised over 99% of the leaching solution. Another positive benefit of using NH4Cl was that precipitation of calcium carbonate by CO2 injection was possible without the addition of basic reagents. Moreover, the NH4Cl regenerated during carbonation can be reused for calcium extraction. However, test results using regenerated NH4Cl solution in a cyclic fashion revealed that the process was not perfectly cyclic, but rather the calcium amount after precipitation increased as the cycle proceeded. The geochemical computer simulation PHREEQC was utilized to gain better insight into the cyclic mineral carbonation processes using NH4Cl solution. The simulation was based on thermodynamic equilibrium so that the amount of Ca in the solution fluctuated between specific values in a periodic fashion, unlike the experimental results of calcium accumulation in the extraction solution. One reason for this phenomenon was the kinetic/thermodynamic balance controlled by the amount of Ca2+ and CO2 present in the solution. However, it was feasible to use a geochemical model to evaluate the mineral carbonation process with the correction factors since the deviation between the experimental and the simulation results remained fairly constant throughout the cycle.

关键词： CO2 Sequestration Mineral Carbonation Waste Cement Ammonium Chloride PHREEQC

Heterogeneous Oxidation of Methylene Blue with Surface-Modified Iron-Amended Activated Carbon

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American Journal of Analytical Chemistry 2013年第7期4卷 115-122页

作者： Jihyun R. kim Branden Santiano Hyosang kim Eunsung Kan Department of Molecular Bioscience and Bioengineering University of Hawaii at Manoa Honolulu USA

The present study aims to develop effective adsorption and oxidation of synthetic dye in wastewater by using the newly synthesized iron-amended activated carbon. Recently synthetic dye-containing wastewater has gained more attention due to its mass discharge, high toxicity and low biodegradation. For enhancing adsorption of dye and oxidative regeneration of dye-exhausted activated carbon, the novel amendment of iron-deposited granular activated carbon (GAC) was developed. It was to amend ferrous ion onto the acid-pretreated GAC when pH of iron solution was higher than the pH at point of zero charge (pH, pzc) of the GAC. Methylene blue (MB) in water was adsorbed onto the acid-treated iron- amended GAC (Fe-GAC) followed by single or multiple applications of H2O2. Batch experiments were carried out to study the adsorption isotherm and kinetics indicating adsorption of MB onto the Fe-GAC followed Langmuir isotherm and the pseudo-second order kinetics. The Fe-GACshowed the maximum adsorption capacity (qm) of 238.1 ± 0.78 mg/g which was higher than the virgin GAC with qm of 175.4 ± 13.6 mg/g at 20?C, pH 6 and the initial concentration of 20 - 200 mg/L. The heterogeneous Fenton oxidation of MB in the Fe-GAC revealedthat increasing the H2O2 loading from 7 to 140 mmol H2O2/mmol MB led to enhancing the oxidation efficiency of MB in the GAC from 62.6% to 100% due to the increased generation of hydroxyl radicals. Further enhancement of oxidation of MB in the Fe-GAC was made by the multiple application of H2O2 while minimizing OH radical scavenging often occurring at high concentration of H2O2. Therefore, the acid-treated iron-amended GAC would provide excellent adsorption capacity for MB and high oxidation efficiency of MB in the GAC with multiple applications of H2O2 and optimum iron loading.

关键词： Adsorption Activated Carbon Iron-Amended Activated Carbon Heterogeneous Oxidation Fenton Oxidation Methylene Blue

VHF meteor radar at King Sejong Station,Antarctica

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Advances in Polar Science 2013年第4期24卷 241-247页

作者： Jeong-Han kim Geonhwa Jee Changsup Lee Yong-Ha kim Division of Polar Climate Research Korea Polar Research Institute26 Songdomirae-roIncheon 406-840Korea Department of Astronomy and Space Science Chungnam National University79 DaehangnoYuseong-guDaejeon 305-764Korea

Since 2002, we have been observing the mesosphere and lower thermosphere （MLT） region over King Sejong Station （KSS; 62.22°S, 58.78°W）, Antarctica, using various instruments such as the Spectral Airglow Temperature Imager （SATI）, All Sky Camera （ASC） and VHF meteor radar. The meteor radar, installed in March 2007, continuously measures neutral winds in the alti- tude region 70-110 km and neutral temperature near the mesopause 24 h.d-1, regardless of weather conditions. In this study, we present results of an analysis of the neutral wind data for gravity wave activity over the tip of the Antarctic Peninsula, where such activity is known to be very high. Also presented is temperature estimation from measurement of the decay times of meteor trails, which is compared with other temperature measurements from SATI and the Sounding of the Atmosphere using Broadband Emis- sion Radiometry （SABER） instrument onboard the Thermosphere Ionosphere Mesosphere Energy and Dynamics （TIMED） satel- lite.

关键词： meteor radar gravity wave mesosphere and lower thermosphere region Antarctica

Synchronization of an optical frequency comb and a microwave oscillator with 53 zs/Hz^(1/2) resolution and 10^(-20) -level stability

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Photonics Research 2022年第2期10卷 365-372页

作者： Changmin Ahn Yongjin Na Minji Hyun Jinho Bae Jungwon kim School of Mechanical and Aerospace Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea

Precise and stable synchronization between an optical frequency comb(femtosecond mode-locked laser oscillator or microresonator-based comb) and a microwave oscillator is important for various fields including telecommunication, radio astronomy, metrology, and ultrafast X-ray and electron science. Timing detection and synchronization using electro-optic sampling with an interferometer has been actively used for low-noise microwave generation, long-distance timing transfer, comb stabilization, time-of-flight sensing, and laser-microwave synchronization for ultrafast science facilities. Despite its outstanding performance, there has been a discrepancy in synchronization performance of more than 10 dB between the projected shot-noise-limited noise floor and the measured residual noise floor. In this work, we demonstrate the shot-noise-limited performance of an electro-optic timing detector-based comb-microwave synchronization, which enabled an unprecedented residual phase noise floor of -174.5 dBc∕Hz at 8 GHz carrier frequency(i.e., 53 zs∕Hz^(1/2)timing noise floor), integrated rms timing jitter of 88 as(1 Hz to 1 MHz), rms timing drift of 319 as over 12 h, and frequency instability of 3.6 × 10^(-20) over 10,000 s averaging time. We identified that bandpass filtering of the microwave signal and optical pulse repetition-rate multiplication are critical for achieving this performance.

关键词： synchronization interferometer Synchronization

简单水热法合成石墨-CdSe复合材料及其光催化降解有机染料(英文)

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催化学报 2011年第10期32卷 1577-1583页

作者： OH Won-Chun CHEN Mingliang CHO Kwangyoun kim Cheolkyu MENG Zeda Department of Advanced Materials Science & Engineering Hanseo UniversityChungnam 356-706Korea Korea Institute of Ceramic Engineering and Technology Seoul 153-801Korea Department of Environmental Engineering Hanbat National UniversityDajeon 305-719Korea

A graphene-CdSe composite was synthesized by a facile hydrothermal method,and characterized by X-ray diffraction,scanning electron microscopy with energy dispersive X-ray analysis,transmission electron microscopy and UV-vis diffuse reflectance *** graphene-CdSe composite efficiently catalyzed the photodegradation of methylene blue(MB),methyl orange(MO) and rhodamine B(Rh.B) in aqueous solution under UV or visible light *** graphene-CdSe composite exhibited a higher photocatalytic activity for the MB solution.

关键词：催化活性有机染料镉元素石墨晶体

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番茄果实颜色形成的分子机制及调控研究进展

园艺学报 2020年第9期47卷 1689-1704页

作者：刘昕陈韵竹 kim Pyol kim Min-Jun Song Hyondok 李玉花王宇东北林业大学生命科学学院东北盐碱植被恢复与重建教育部重点实验室哈尔滨150000

番茄果实颜色主要包括绿色、黄色、红色、粉色和紫色等,这些颜色的形成是叶绿素、类胡萝卜素、番茄红素、黄酮类化合物等多种次生代谢物质积累综合呈现的结果。针对近年来关于控制番茄果实颜色形成的相关基因、生物合成途径及其调控机... 详细信息

番茄果实颜色主要包括绿色、黄色、红色、粉色和紫色等,这些颜色的形成是叶绿素、类胡萝卜素、番茄红素、黄酮类化合物等多种次生代谢物质积累综合呈现的结果。针对近年来关于控制番茄果实颜色形成的相关基因、生物合成途径及其调控机制的研究进展进行综述,旨在为今后通过生物技术手段进行番茄果色农艺性状改良提供参考。

关键词：番茄果色次生代谢途径调控机制

Comparison of School Building Construction Costs Estimation Methods Using Regression Analysis, Neural Network, and Support Vector Machine

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Journal of Building Construction and Planning Research 2013年第1期1卷 1-7页

作者： Gwang-Hee kim Jae-Min Shin Sangyong kim Yoonseok Shin Department of Architectural Engineering Graduate School of Kyonggi University Suwon-Si Korea Department of Plant & Architectural Engineering Kyonggi University Suwon-Si Korea School of Construction Management and Engineering University of Reading Reading UK

Accurate cost estimation at the early stage of a construction project is key factor in a project’s success. But it is difficult to quickly and accurately estimate construction costs at the planning stage, when drawings, documentation and the like are still incomplete. As such, various techniques have been applied to accurately estimate construction costs at an early stage, when project information is limited. While the various techniques have their pros and cons, there has been little effort made to determine the best technique in terms of cost estimating performance. The objective of this research is to compare the accuracy of three estimating techniques (regression analysis (RA), neural network (NN), and support vector machine techniques (SVM)) by performing estimations of construction costs. By comparing the accuracy of these techniques using historical cost data, it was found that NN model showed more accurate estimation results than the RA and SVM models. Consequently, it is determined that NN model is most suitable for estimating the cost of school building projects.

关键词： Estimating Construction Costs Regression Analysis Neural Network Support Vector Machine

Expanded natural killer cells augment the antimyeloma effect of daratumumab, bortezomib, and dexamethasone in a mouse model

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Cellular & Molecular Immunology 2021年第7期18卷 1652-1661页

作者： Jaya Lakshmi Thangaraj Seo-Yeon Ahn Sung-Hoon Jung Manh-Cuong Vo Tan-Huy Chu Minh-Trang Thi Phan Minsuk Kwon Kyung-Hwa Lee Mihee kim Ga-Young Song Deok-Hwan Yang Jae-Sook Ahn Hyeoung-Joon kim Duck Cho Je-Jung Lee Research Center for Cancer Immunotherapy Chonnam National University Hwasun Hospital and Chonnam National University Medical SchoolGwangjuKorea Department of Hematology-Oncology Chonnam National University Hwasun Hospital and Chonnam National University Medical SchoolGwangjuKorea Department of Molecular Medicine Chonnam National UniversityGwangjuKorea Stem Cell&Regenerative Medicine Institute Samsung Medical CenterSeoulKorea View author publications Division of Hematology-Oncology Department of MedicineSamsung Medical CenterSungkyunkwan University School of MedicineSeoulKorea Department of Pathology Chonnam National University Medical SchoolGwangjuKorea Department of Health Sciences and Technology SAIHSTSungkyunkwan UniversitySeoulKorea Department of Laboratory Medicine and Genetics Samsung Medical CenterSungkyunkwan University School of MedicineSeoulKorea

The use of natural killer(NK)cells is a promising and safe immunotherapeutic approach in the field of cancer ***,combination treatments are required to enhance the effector functions and therapeutic efficacy of NK *** this study,we investigated the potential of daratumumab(Dara),bortezomib,and dexamethasone(Dvd)to augment the antitumor effects of NK cells in a multiple myeloma(MM)xenograft mouse *** cells were expanded and activated using the K562-OX40 ligand and membrane-bound IL-18 and IL-21 in the presence of IL-2 and IL-15 from peripheral blood mononuclear cells from MM patients.A human MM xenograft model was established using human RPMI8226-RFP-FLuc cells in NOD/SCID IL-2Rγnull(NSG)***-bearing mice were divided into six treatment groups:no treatment,expanded NK cells(eNKs),Dara,Dara+eNKs,Dvd,and Dvd+*** treatment strongly enhanced the cytotoxicity of eNKs by upregulating expression of NK cell activation ligands,downregulating expression of NK cell inhibitory ligands,and promoting antibody-dependent cellular *** combination of eNKs with Dvd significantly prolonged mouse survival and reduced the tumor burden and serum M-protein ***,Dvd pretreatment significantly increased eNK persistence and homing to MM *** findings suggest that Dvd treatment potentiates the antimyeloma effects of NK cells expanded and activated ex vivo by modulating immune responses in MM-bearing mice.

关键词： Multiple myeloma Natural killer cell Chemotherapy