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Femtosecond laser-mediated anchoring of polymer layers on the surface of a biodegradable metal

Journal of Magnesium and Alloys 2021年第4期9卷 1380-1388页

作者： Jaeho Park Bo-In Park Young Ju Son Sun Hee lee Seung-Hoon Um Yu-chan Kim Myoung-Ryul ok Jeong-Yun Sun Hyung-Seop Han Hojeong Jeon Center for Biomaterials Korea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea Department of Materials science and Engineering Seoul National University(SNU)Seoul 08826Republic of Korea Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea Division of Bio-Medical Science and Technology KIST SchoolKorea University of Science and TechnologySeoul 02792Republic of Korea KU-KIST Graduate School of Converging Science and Technology Korea UniversitySeoul 02841Republic of Korea

Mg has received much attention as a next-generation implantable material owing to its biocompatibility,bone-like mechanical properties,and biodegradability in physiological *** application of various polymer coatings has been conducted in the past to reduce the rapid formation of hydrogen gas and the local change in pH during the initial phase of the chemical reaction with the body ***,we propose femtosecond(fs)laser-mediated Mg surface patterning for significant enhancement of the binding strength of the coating material,which eventually reduces the corrosion *** of the structural,physical,crystallographic,and chemical properties of the Mg surface have been conducted in order to understand the mechanism by which the surface adhesion increases between Mg and the polymer coating *** on the fs laser conditions,the surface structure becomes rough owing to the presence of several microscaled pits and grooves of nanoporous MgO,resulting in a tightly bonded poly(lactic-co-glycolic acid)(PLGA)*** corrosion rate of the PLGA-coated,fs laser-treated Mg is considerably slow compared with the non-treated Mg;the treated Mg is also more biocompatible compared with the non-treated *** fs laser-based surface modification technique offers a simple and quick method for introducing a rough coating on Mg;further,it does not require any chemical treatment,thereby overcoming a potential obstacle for its clinical use.

关键词： Femtosecond laser Biodegradable metal Polymer coating Surface modification Surface adhesion

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Tetradentate Pt(Ⅱ)complex as a singlet exciton sensitizing host for highly efficient green fluorescent organic light-emitting diodes

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Science China Materials 2024年第8期67卷 2618-2627页

作者： Unhyeok Jo Seung chan Kim chan Hee Ryu Kang Mun lee Jae-Min Kim Jun Yeob lee School of Chemical Engineering Sungkyunkwan University2066Seobu-roJangan-guSuwon-siGyeonggi-do 16419Republic of Korea Department of Chemistry Institute for Molecular Science and Fusion TechnologyKangwon National UniversityChuncheonGangwon 24341Republic of Korea Department of Advanced Materials Engineering Chung-Ang University4726Seodong-daeroDaedeok-myeonAnseong-siGyeonggi-do 17546Republic of Korea SKKU Advanced Institute of Nano Technology Sungkyunkwan University2066Seobu-roJangan-guSuwonGyeonggi 16419Republic of Korea SKKU Institute of Energy Science and Technology Sungkyunkwan University2066Seobu-roJangan-guSuwonGyeonggi 16419Republic of Korea

Efficient green fluorescent organic light-emitting diodes were designed with a phosphorescent metal complex as a singlet exciton sensitizing host(SESH)for achieving high efficiency and low efficiency roll-off through exciton and polaron *** Pt(Ⅱ)complex(Pt-Trz)possessing a tetradentate ligand with a bulky blocking group not only suppresses the severe formation of excimer or dimer itself but also transfers radiative excitons to fluorescent dopant *** SESH assisted fluorescence(SESHF)device with Pt-Trz as the host exhibits the maximum external quantum efficiency of 13.3%and a lower efficiency roll-off compared with exciplex host device which is a general approach for harvesting triplet *** exciton dynamics modeling unravels that the SESHF device effectively utilizes triplet excitons in the host by intersystem crossing and resonance energy transfer from the triplet state of the host to the singlet state of the terminal *** quenching rates of the SESHF device are reduced by 11 times for triplet-triplet annihilation and 1.8 times for tripletpolaron annihilation compared with the exciplex device,which demonstrates that Pt-Trz could be a platform to be used as an efficient host for fluorophores.

关键词： singlet annihilation polaron

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Continuous Tracking of GPS Signals with Data Wipe-Off Method

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Computers, Materials & Continua 2022年第5期71卷 3803-3820页

作者： Dah-Jing Jwo Kun-chan lee Department of Communications Navigation and Control EngineeringTaiwan Ocean UniversityKeelung202301Taiwan

The decentralized pre-filter based vector tracking loop(VTL)configuration with data wipe-off(DWO)method of the Global Positioning System(GPS)receiver is proposed for performance *** is a challenging task to continuously track the satellites’signals in weak signal environment for the GPS *** is a very attractive technique as it can provide tracking capability in signal-challenged *** the VTL,each channel will not form a loop *** the contrary,the signals in the channels of VTL are shared with each other;the navigation processor in turn predicts the code ***,the receiver can successfully track signals even the signal strength from individual satellite is *** tracking loop based on the pre-filter provides more flexible adjustment to specific environments to reduce noise ***,even if the signals from some satellites are very weak the receiver can track them from the navigation results based on the other *** navigation data,which contains information necessary to perform navigation computations,are binary phase-shift keying(BPSK)modulated onto the GPS carrier phase with the bit duration of 20 ms(i.e.,50 bits per second)for the GPS L1 C/A *** coherent integration interval can be extended for improved tracking performance in signal-challenged ***,tracking accuracy is decreased by possible data bit sign *** DWO algorithm can be employed to remove the data bit in I and Q correlation values so as to avoid energy loss due to bit transitions when the integration interval of the correlator is extended over 20 ms under the low carrier-to-noise ratio(C/No)*** proposed method has an advantage to provide continuous tracking of signals and obtain improved navigation *** evaluation of the tracking capability as well as positioning accuracy will be presented.

关键词： Global positioning system(GPS) vector tracking loop pre-filter data wipe-off weak signal

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Cloud Radiative Effects and changes Simulated by the Coupled Model Intercomparison Project Phase 5 Models

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Advances in Atmospheric Sciences 2017年第7期34卷 859-876页

作者： Sun-Hee SHIN ok-Yeon KIM Dongmin KIM Myong-In lee Climate Research Department APEC Climate Center Busan 48058 Republic of Korea School of Urban and Environmental Engineering Ulsan National Institute of Science and Technology Ulsan 44919 Republic of Korea

Using 32 CMIP5（Coupled Model Intercomparison Project Phase 5） models, this study examines the veracity in the simulation of cloud amount and their radiative effects（CREs） in the historical run driven by observed external radiative forcing for 1850-2005, and their future changes in the RCP（Representative Concentration Pathway） 4.5 scenario runs for2006-2100. Validation metrics for the historical run are designed to examine the accuracy in the representation of spatial patterns for climatological mean, and annual and interannual variations of clouds and CREs. The models show large spread in the simulation of cloud amounts, specifically in the low cloud amount. The observed relationship between cloud amount and the controlling large-scale environment are also reproduced diversely by various models. Based on the validation metrics,four models-ACCESS1.0, ACCESS1.3, Had GEM2-CC, and Had GEM2-ES-are selected as best models, and the average of the four models performs more skillfully than the multimodel ensemble *** models project global-mean SST warming at the increase of the greenhouse gases, but the magnitude varies across the simulations between 1 and 2 K, which is largely attributable to the difference in the change of cloud amount and distribution. The models that simulate more SST warming show a greater increase in the net CRE due to reduced low cloud and increased incoming shortwave radiation, particularly over the regions of marine boundary layer in the subtropics. Selected best-performing models project a significant reduction in global-mean cloud amount of about-0.99% K^-1and net radiative warming of 0.46 W m^-2K^-1, suggesting a role of positive feedback to global warming.

关键词： warming cloud radiative historical CMIP interannual greenhouse ACCESS oceans seasonal

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Improved Dual-image Quality with Reversible Data Hiding Using Translocation and Switching Strategy

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Computer Systems Science & Engineering 2023年第2期44卷 1551-1566页

作者： Chin-Feng lee Kuo-Chung chan Department of Information Management Chaoyang University of TechnologyTaichung41349Taiwan

Dual-image reversible data hiding(RDH)is a technique for hiding important *** technology can be used to safely deliver secret mes-sages to the recipient through dual images in an open network without being easily *** recipient of the image must receive the two stego-images before the secret message can be completely *** is one of the main advantages of data hiding technology;to increase the imperceptibility,the quality requirements of the stego-images are relatively important.A dual ste-ganographic image RDH method,called a DS-CF scheme that can achieve a bet-ter steganographic image quality using the center folding(CF)*** this paper,we developed a translocation and switching strategy(TaS)to shorten the distances between the stego-pixel coordinates and the cover pixel coordinates after information being *** with the DS-CF scheme,our proposed DS-TaS scheme can effectively improve the quality of the steganographic images at the same level of embedding *** experimental results show that the PSNR of our DS-TaS scheme at k=1 was 55.66 dB,which is an increase of 1.5 dB,and is 51.43 dB for k=2,46.66 dB for k=3,and 40.91 dB for k=*** addition,the PSNR values of the stego images was increased by 1.5,0.29,0.29,and 0.19 dB,*** shows that our proposed dual-image RDH method can optimize the visual quality of the stego-images and is better than many other dual-image RDH techniques.

关键词： Information hiding reversible data hiding(RDH) dual-image RDH center folding(CF)strategy

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Regulation of cell locomotion by nanosecond-laser-induced hydroxyapatite patterning

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Bioactive Materials 2021年第10期6卷 3608-3619页

作者： Seung-Hoon Um Jaehong lee In-Seok Song Myoung-Ryul ok Yu-chan Kim Hyung-Seop Han Sang-Hoon Rhee Hojeong Jeon Center for Biomaterials Biomedical Research InstituteKorea Institute of Science and Technology(KIST)Seoul02792Republic of Korea Department of Dental Biomaterials Science Dental Research InstituteSchool of DentistrySeoul National UniversitySeoul03080Republic of Korea Department of Oral and Maxillofacial Surgery Korea University Anam HospitalSeoul02841Republic of Korea Division of Bio-Medical Science and Technology KIST SchoolKorea University of Science and TechnologySeoul02792Republic of Korea KU-KIST Graduate School of Converging Science and Technology Korea UniversitySeoul02841Republic of Korea

Hydroxyapatite,an essential mineral in human bones composed mainly of calcium and phosphorus,is widely used to coat bone graft and implant surfaces for enhanced biocompatibility and bone *** a strong implant-bone bond,the bone-forming cells must not only adhere to the implant surface but also move to the surface requiring bone ***,strong adhesion tends to inhibit cell migration on the surface of ***,a cell migration highway pattern that can promote cell migration was prepared using a nanosecond laser on hydroxyapatite *** developed surface promoted bone-forming cell movement compared with the unpatterned hydroxyapatite surface,and the cell adhesion and movement speed could be controlled by adjusting the pattern ***-cell microscopy,cell tracking,and serum protein analysis revealed the fundamental principle of this *** findings are applicable to hydroxyapatite-coated biomaterials and can be implemented easily by laser patterning without complicated *** cell migration highway can promote and control cell movement while maintaining the existing advantages of hydroxyapatite ***,it can be applied to the surface treatment of not only implant materials directly bonded to bone but also various implanted biomaterials implanted that require cell movement control.

关键词： Nanosecond laser Laser engraving Hydroxyapatite patterning Cell migration control Cell tracking

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Simulation of Storm Surge and Wave Due to Typhoon Isewan(5915)

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China Ocean Engineering 2015年第4期29卷 473-488页

作者： Jin-Hee YUK Kyeong ok KIM Han Soo lee Byung Ho CHOI Disaster Management HPC Technology Research Center Korea Institute of Science and Technology Information Marine Radionuclide Research Center Korea Institute of Ocean Science & Technology Graduate School of Science and Engineering Saitama University Department of Civil and Environmental Engineering Sungkyunkwan University

An integrally coupled wave-tide-surge model was developed and then applied to the simulation of the wave-typhoon surge for the typhoon Isewan （typhoon Vera （5915））, which is the strongest typhoon that has struck Japan and caused incalculable damage. An integrally coupled tide-surge-wave model using identical and homogeneous meshes in an unstructured grid system was used to correctly resolve the physics of wave-circulation interaction in both models. All model components were validated independently. The storm surge and wave properties such as the surge height, the significant wave height, wave period and direction were reproduced reasonably under the meteorological forcing, which was reprocessed to be close to the observations. The resulting modeling system can be used extensively for the prediction of the storm surge and waves and the usual barotropic forecast.

关键词： typhoon Isewan storm surge wave tide coupled wave-tide-surge model

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Performance of LIDAR- and radar-based turbulence intensity measurement in comparison with anemometer-based turbulence intensity estimation based on aircraft data for a typical case of terrain-induced turbulence in association with a typhoon

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2013年第7期14卷 469-481页

作者： P.W.chan Y.F.lee Hong Kong Observatory

The Hong Kong Observatory (HKO) provides low-level turbulence alerting service for the Hong Kong International Airport (HKIA) through the windshear and turbulence warning system (WTWS). In the WTWS, turbulence intensities along the flight paths of the airport are estimated based upon correlation equations established between the surface anemometer data and the turbulence data from research aircraft before the opening of the airport. The research aircraft data are not available on day-to-day basis. The remote sensing meteorological instruments, such as the Doppler light detection and ranging (LIDAR) and radar, may be used to provide direct measurements of turbulence intensities over the runway corridors. The performances of LIDAR- and radar-based turbulence intensity data are studied in this paper based on actual turbulence intensity measurements made on 423 commercial jets for a typical case of terrain-induced turbulence in association with a typhoon. It turns out that, with the tuning of the relative operating characteristic (ROC) curve between hit rate and false alarm rate, the LIDAR-based turbulence intensity measurement performs better than the anemometer-based estimation of WTWS for turbulence intensity at moderate level or above. On the other hand, the radar-based measurement does not perform as well when compared with WTWS. By combining LIDAR- and radar-based measurements, the performance is slightly better than WTWS, mainly as a result of contribution from LIDAR-based measurement. As a result, the LIDAR-based turbulence intensity measurement could be used to replace anemometer-based estimate for non-rainy weather conditions. Further enhancements of radar-based turbulence intensity measurement in rain would be necessary.

关键词： Fault tolerant High availability quadruple vital computer (HAQVC) Reliability availability maintainability and safety (RAMS)

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Deformation prediction of porcelain-enameled steels with strain history by press forming and high-temperature behavior of coating layer

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中国有色金属学会会刊：英文版 2012年第S3期22卷 838-844页

作者： Young-Ki SON chan-Joo lee Jung-Min lee Byung-Min KIM School of Mechanical Engineering Pusan National University Dongnam Regional Division Korea Institute of Industrial Technology

Porcelain enamel coatings were widely applied for the protection of steel products because they offered high corrosion protection,resistance to heat and abrasion,high hardness,hygiene and ease of *** typical process to produce enameled steels is roughly divided into two stages:the first stage consists of a forming process to give the desired shape to a steel substrate,and the second stage consists of a firing process to bond enamel frits on the *** firing process requires a high temperature above 800 °C,which may lead to austenitic transformation and severe thermal deformation of the steel *** aim of this study is to develop a finite element analysis (FE analysis) technique to predict the mechanical and thermal deformations of the enameled steels during forming and any further enameling process,including *** FE analysis involves analyzing the strain history of the steel substrate,which comprises the stress and thickness distributions of the substrate and its deformed shape,and the high-temperature behavior of the enamel coating *** validity of the FE analysis is verified through the U-bending test and firing test with various numbers and positions of enamel coating layers on the *** results reveal that the FE analysis results agree well with the experimental results with 8% error.

关键词： porcelain enamel firing process finite element analysis enameled steel thermal deformation

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Colonoscopy-induced ischemic colitis in patients without risk factors

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World Journal of Gastroenterology 2014年第13期20卷 3698-3702页

作者： Sang ok lee Sae Hee Kim Sung Hee Jung chan Woong Park Min Ji lee Jin A lee Hyun Cheol Koo Anna Kim Hyun-Young Han Dong-Wook Kang Division of Gastroenterology Department of Internal MedicineEulji University College of MedicineEulji University HospitalDaejeon 302-779South Korea Department of radiology Eulji University College of MedicineEulji University HospitalDaejeon 302-779South Korea Department of pathology Eulji University College of MedicineEulji University HospitalDaejeon 302-779South Korea

Ischemic colitis is the most common form of intestinal *** is a condition that is commonly seen in the elderly and among individuals with risk factors for *** predisposing conditions for ischemic colitis are major vascular occlusion,small vessel disorder,shock,some medications,colonic obstructions and hematologic *** colitis following colonoscopy is ***,we report two cases of ischemic colitis after a routine screening colonoscopy in patients without risk factors for ischemia.

关键词： Ischemic colitis Colonoscopy Hematochezia

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