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Damage Detection of Composite Plates Using Finite Element Analysis Based on Structural Health Monitoring

材料科学与工程（中英文B版） 2011年第1期1卷 14-21页

作者： Kyoung-Tak Kang Heoung-Jae Chun Jin Ah Lee Joon-Hyung Byun moon-kwang um Sang-Kwan Lee Byung-SunKim School of Mechanical Engineering Yonsei University 262 Seongsanno Seodaemun-Gu Seoul 120-749 Korea Korea Institute of Materials Science 66 Sangnam-Dong Changwon Kyungnam 641-010 Korea

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Settling and dewatering characteristics of granulated methane-oxidizing bacteria

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Journal of Environmental Sciences 2013年第2期25卷 280-286页

作者： kwang Ho Ahn kwang Soo Kim Sung Won Kang Chul Yong um Won Tae Lee kwang Baik Ko Korea Institute of Construction Technology 283Goyangdae-RoIlsanseo-GuGoyang-SiGyeonggi-Do 411-712Korea School of Civil and Environmental Engineering Yonsei UniversitySinchondong 134SudaemunguSeoul 120-749Korea School of Civil and Environmental Engineering Kumoh National Institute of TechnologyDaehak-ro 61GumiGyeongbuk 730-701Korea

We evaluated the settling ability and dewaterability of granulated methane-oxidizing bacteria （GMOB） after granulation using a continuous-flow reactor. A comparative analysis on settling and dewatering characteristics due to changes in sludge retention time （SRT, 10, 15 and 20 days） during cultivation of GMOB was conducted. In assessing dewaterability, the specific resistance to filtration （SRF） of activated sludge and GMOB was found to be 8.21×1013-2.38×1014 and 4.88 × 1012-1.98×1013 m/kg, respectively. It was confirmed that as SRT decreased, SRF of GMOB increased. In the case of bound extracellular polymeric substance （EPS）, activated sludge registered 147.5 mg/g-VSS while GMOB exhibited 171-177.2 mg/g-VSS. In the case of extracellular polymeric substance soluble EPS in effluent, activated sludge measured 62 mg/L and GMOB had 17.4-21.4 mg/L. The particle size analysis showed that mean particle diameters of GMOB were 402, 369, and 350 μm, respectively, at SRTs of 20, 15 and 10 days. In addition, it was found that GMOB had a larger mean particle diameter and exhibited much better settleability and dewaterability than activated sludge did.

关键词： methane-oxidizing bacteria dewaterability specific resistance to filtration extracellular polymeric substances

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Voxelated opto-physically unclonable functions via irreplicable wrinkles

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Light(Science & Applications) 2023年第11期12卷 2378-2390页

作者： Kitae Kim Se-um Kim moon-Young Choi Mohsin Hassan Saeed Youngmin Kim Jun-Hee Na Department of Convergence System Engineering Chungnam National University99 Daehak-roYuseong-guDaejeon 34134Republic of Korea Department of Electrical and Information Engineering Seoul National University of Science&Technology232 Gongneung-roNowon-guSeoul 01811Republic of Korea Department of Electrical Electronicsand Communication Engineering EducationChungnam National University99 Daehak-roYuseong-guDaejeon 34134Republic of Korea Hologram Research Center Korea Electronics Technology InstituteWorld Cup buk-ro 54-gilMapo-guSeoul 03924Republic of Korea

The increased prevalence of the Internet of Things(IoT)and the integration of digital technology into our daily lives have given rise to heightened security risks and the need for more robust security *** response to these challenges,physical unclonable functions(PUFs)have emerged as promising solution,offering a highly secure method to generate unpredictable and unique random digital values by leveraging inherent physical ***,traditional PUFs implementations often require complex hardware and circuitry,which can add to the cost and complexity of the *** present a novel approach using a random wrinkles PUF(rw-PUF)based on an optically anisotropic,facile,simple,and cost-effective *** wrinkles contain randomly oriented liquid crystal molecules,resulting in a two-dimensional retardation map corresponding to a complex birefringence ***,our proposed technique allows for customization based on specific requirements using a spatial light modulator,enabling fast *** random wrinkles PUF has the capability to store multiple data sets within a single PUF without the need for physical ***,we introduce a concept called‘polyhedron authentication,’which utilizes three-dimensional information storage in a voxelated random wrinkles *** approach demonstrates the feasibility of implementing high-level security technology by leveraging the unique properties of the rw-PUF.

关键词： hardware functions utilize

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A hydrometallurgical method of energy saving type for separation of rare earth elements from rare earth polishing powder wastes with middle fraction of ceria

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Journal of Rare Earths 2016年第5期34卷 536-542页

作者： um Namil HIRATO Tetsuji Resource Recirculation Research Division National Institute of Environmental Research Department of Energy Science and Technology Graduate School of Energy ScienceKyoto University

This study described a hydrometallurgical method to investigate the separation of rare earth elements（REEs）from rare earth polishing powder wastes（REPPWs）containing large amounts of rare earth oxides with a major phase of CeO2 and minor phases of La2O3,Pr2O3,and Nd2O3 using a process devised by the *** suggested approach consisted of five processes：the synthesis of NaR E（SO4）2·xH2O from rare earth oxides in Na2SO4-H2SO4-H2 O solutions（Process 1）,the conversion of NaR E（SO4）2·xH2O into RE（OH）3 using NaO H（Process 2）,and the oxidation of Ce（OH）3 into Ce（OH）4 using air with O2 injection（Process 3）,followed by Processes 4 and 5 for separation of REEs by acid leaching using HCl and H2SO4,*** confirm the high yield of NaR E（SO4）2·xH2O in Process 1,experiments were carried out under various Na2SO4 concentrations（0.4–2.5 mol/L）,sulfuric acid concentrations（6–14 mol/L）,and reaction temperatures（95–125 oC）.In addition,the effect of the pH value on the separation of Ce（OH）4 in HCl-H2 O solutions with Ce（OH）4,La-,Pr-,and Nd（OH）3 in Process 4 was also *** the basis of above results,the possibility of effective separation of REEs from REPPWs could be confirmed.

关键词： rare earth elements(REEs) rare earth polishing powder wastes(REPPWs) separation sodium cerium sulfate hydrometallurgical process

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Indolo[3,2,1-jk]carbazole-derived planar electron transport materials realizing high efficiency in green phosphorescent organic light-emitting diodes

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Science China Materials 2023年第11期66卷 4437-4444页

作者： Sejeong um Unhyeok Jo Jun Yeob Lee School of Chemical Engineering Sungkyunkwan University 2066Seobu-roJangan-guSuwonGyeonggi16419Republic of Korea SKKU Advanced Institute of Nano Technology Sungkyunkwan University 2066Seobu-roJangan-guSuwonGyeonggi16419Republic of Korea SKKU Institute of Energy Science and Technology Sungkyunkwan University 2066Seobu-roJangan-guSuwonGyeonggi16419Republic of Korea

Two novel electron transporting materials(ETMs),2-(4,6-diphenyl-1,3,5-triazin-2-yl)indolo[3,2,1-jk]-carbazole(DPTrz-ICz)and 5,11-bis(4,6-diphenyl-1,3,5-triazin-2-yl)-2-phenylindolo[3,2,1-jk]carbazole(2DPTrz-ICz),were developed based on the indolo[3,2,1-jk]carbazole(ICz)core,combined with 2,4-diphenyl-1,3,5-triazine(DPTrz).The introduced ICz core in ETM exhibited enhanced intermolecular charge transport properties owing to its planar and rigid geometry and high triplet energy,demonstrating the potential of designing ***,2DPTrz-ICz,featuring high triplet energy of 2.84 eV,effectively prevented triplet exciton quenching and showed increased electron mobility owing to the activation of intermolecular hopping charge transfer facilitated by stacking *** two materials were utilized as ETMs in green phosphorescent organic light-emitting diodes.2DPTrz-ICz exhibited a superior external quantum efficiency of 21.5%,higher than that of the spirobifluorene-derived ETM.

关键词： electron transport layer indolocarbazole efficiency OLED

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Proline Accumulation,Photosynthetic Abilities and Growth Characters of Sugarcane(Saccharum officinarum L.) Plantlets in Response to Iso-Osmotic Salt and Water-Deficit Stress

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Agricultural Sciences in China 2009年第1期8卷 51-58页

作者： Suriyan Cha-um Chalermpol Kirdmanee National Center for Genetic Engineering and Biotechnology(BIOTEC) National Science and Technology Development Agency(NSTDA)

The aim of this study was to investigate the biochemical, physiological and morphological responses of sugarcane to iso- osmotic salt and water-deficit stress. Disease-free sugarcane plantlets derived from meristem cuttings were photo- autotrophically grown in MS media and subsequently exposed to -0.23 （control）, -0.67 or -1.20 MPa iso-osmotic NaCl （salt stress） or mannitol （water-deficit stress）. Chlorophyll a （Chl a）, chlorophyll b （Chl b）, total carotenoids （Cx＋c）, maximum quantum yield of PSII （Fv/Fm）, photon yield of PSII （ΦPSII）, stomatal conductance （Gs） and transpiration rate （E） in the stressed plantlets were significantly reduced when compared to those of plantlets of the control group （without mannitol or NaCl）, leading to net-photosynthetic rate （Pn） and growth reduction with positive correlation. In addition, physiological changes and growth parameters of plantlets in the salt stress conditions were more sharply reduced than those in waterdeficit stress conditions. On the other hand, the proline content and non-photochemical quenching （NPQ） in the leaves of stressed plantlets increased significantly, especially in response to iso-osmotic salt stress. The chlorophyll pigments in iso-osmotic stressed leaves were significantly degraded （r^2 = 0.93）, related to low water oxidation （r^2 = 0.87）, low net- photosynthetic rate （r^2 = 0.81）, and growth reduction （r^2 = 0.97）. The multivariate biochemical, physiological and growth parameters in the present study should be further used to develop salt, or drought, tolerance indices in sugarcane breeding programs.

关键词： growth performances net-photosynthetic rate pigment degradation proline water oxidation

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Malaria parasite status and cholesterol level of malaria patients in parts of the IMO River Basin of Nigeria

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Asian Pacific Journal of Tropical Medicine 2011年第12期4卷 993-996页

作者： Chukwuocha um Eke KN Department of Public Health Technology Federal University of Technology OwerriNigeria

Objective:To investigate the relationship between malaria parasite status and cholesterol level of 110 consenting subjects(55 patients and 55 controls) in parts of the Imo River Basin of Nigeria. Methods:Giemsa staining was used for malaria parasite examination while Randox cholesterol kit was used for cholesterol level ***:About 49 persons(90%) with malaria had low cholesterol(<180 mg/dL).Highest mean cholesterol levels were 274 mg/dL for study patients and 220 mg/dL for controls respectively;Lowest mean cholesterol levels were 168 mg/dL (patienls) and 138 mg/dL(controls) *** cholesterol levels(< 180 mg/dL) were found in patients(84%) and controls(6%) ***.16.4%of controls and 6%of patients had borderline cholesterol level(200-239 mg/dL).This study establishes a significant correlation(12.9%.P<0.01) between malaria parasite status and cholesterol ***: These findings imply that choleslerol level estimation may be a potential concurrent and valuable diagnosis for malaria status.

关键词： Malaria Cholesterol Lipids Liver cells Parasiteamia

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TGF-β2 downregulates osteogenesis under inflammatory conditions in dental follicle stem cells

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International Journal of Oral Science 2018年第4期10卷 232-243页

作者： Soyoun um Joo-Hee Lee Byoung-Moo Seo Biotooth Engineering Lab Dental Research InstituteDental Regenerative BiotechnologyDepartment of Dental ScienceSchool of DentistrySeoul National University Biotooth Engineering Lab Department of Oral and Maxillofacial Surgery and Craniomaxillofacial Life ScienceDental Research InstituteSchool of DentistrySeoul ational University

Bone formation is important for the reconstruction of bone-related structures in areas that have been damaged by *** conditions such as those that occur in patients with rheumatoid arthritis, cystic fibrosis, and periodontitis have been shown to inhibit osteoblastic differentiation. This study focussed on dental follicle stem cells(DFSCs), which are found in developing tooth germ and participate in the reconstruction of alveolar bone and periodontal tissue in periodontal disease. After bacterial infection of inflamed dental tissue, the destruction of bone was observed. Currently, little is known about the relationship between the inflammatory environment and bone formation. Osteogenic differentiation of inflamed DFSCs resulted in decreased alkaline phosphatase(ALP) activity and alizarin red S staining compared to normal DFSCs. Additionally, in vivo transplantation of inflamed and normal DFSCs demonstrated severe impairment of osteogenesis by inflamed DFSCs. Protein profile analysis via liquid chromatography coupled with tandem mass spectrometry was performed to analyse the differences in protein expression in inflamed and normal tissue. Comparison of inflamed and normal DFSCs showed significant changes in the level of expression of transforming growth factor(TGF)-β2. Porphyromonas gingivalis(P.g.)-derived lipopolysaccharide(LPS) was used to create in vitro inflammatory conditions similar to periodontitis. The osteogenic differentiation of LPS-treated DFSCs was suppressed, and the cells displayed low levels of TGF-β1 and high levels of TGF-β2. DFSCs treated with TGF-β2 inhibitors showed significant increases in alizarin red S staining and ALP activity. TGF-β1 expression was also increased after inhibition of TGF-β2. By examining inflamed DFSCs and LPS-triggered DFSCs, these studies showed both clinically and experimentally that the increase in TGF-β2 levels that occurs under inflammatory conditions inhibits bone formation.

关键词： TGF downregulates osteogenesis under inflammatory conditions in dental follicle stem cells

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Surface properties of Al-doped ZnO thin film before and after CF_4/Ar plasma etching

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Plasma Science and Technology 2022年第7期24卷 194-200页

作者： Young-Hee JOO Gwan-Ha KIM Doo-Seung um Chang-Il KIM School of Electrical and Electronics Engineering Chung-Ang UniversitySeoul 06974Republic of Korea Department of Semiconductor Materials and Applications Korea PolytechnicSeongnam 13122Republic of Korea Department of Electrical Engineering Sejong UniversitySeoul 05006Republic of Korea

Al-doped ZnO(AZO) is considered as an alternative to transparent conductive oxide *** and achieving a stable surface are important challenges in the development and optimization of dry etching processes, which must be overcome for the application of AZO in various devices. Therefore, in this study, the etch rate and surface properties of an AZO thin film after plasma etching using the adaptive coupled plasma system were investigated. The fastest etch rate was achieved with a CF_(4)/Ar ratio of 50:50 sccm. Regardless of the ratio of CF_(4) to Ar,the transmittance of the film in the visible region exceeded 80%. X-ray photoelectron spectroscopy analysis of the AZO thin film confirmed that metal-F bonding persists on the surface after plasma etching. It was also shown that F eliminates O vacancies. Consequently, the work function and bandgap energy increased as the ratio of CF-4 increased. This study not only provides information on the effect of plasma on AZO thin film, but identifies the cause of changes in the device characteristics during device fabrication.

关键词： Al-doped ZnO plasma etching F-based plasma surface characteristics X-ray photoelectron spectroscopy ultraviolet photoelectron spectroscopy

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Potential Alzheimer’s disease therapeutic nano-platform: Discovery of amyloid-beta plaque disaggregating agent and brain-targeted delivery system using porous silicon nanoparticles

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Bioactive Materials 2023年第6期24卷 497-506页

作者： Jaehoon Kim Hyeji um Na Hee Kim Dokyoung Kim Department of Biomedical Science Graduate SchoolKyung Hee UniversitySeoul02447Republic of Korea Medical Research Center for Bioreaction to Reactive Oxygen Species and Biomedical Science Institute Kyung Hee UniversitySeoul02447Republic of Korea Department of Anatomy and Neurobiology College of MedicineKyung Hee UniversitySeoul02447Republic of Korea Center for Converging Humanities Kyung Hee UniversitySeoul02447Republic of Korea KHU-KIST Department of Converging Science and Technology Kyung Hee UniversitySeoul02447Republic of Korea UC San Diego Materials Research Science and Engineering Center 9500 Gilman Drive La JollaCA92093USA

There has been a lot of basic and clinical research on Alzheimer’s disease(AD)over the last 100 years,but its mechanisms and treatments have not been fully *** some controversies,the amyloid-beta hypothesis is one of the most widely accepted causes of *** this study,we disclose a new amyloid-beta plaque disaggregating agent and an AD brain-targeted delivery system using porous silicon nanoparticles(pSiNPs)as a therapeutic nano-platform to overcome *** hypothesized that the negatively charged sulfonic acid functional group could disaggregate plaques and construct a chemical *** a result of the in vitro assay of amyloid plaques and library screening,we confirmed that 6-amino-2-naphthalenesulfonic acid(ANA)showed the highest efficacy for plaque disaggregation as a hit *** confirm the targeted delivery of ANA to the AD brain,a nano-platform was created using porous silicon nanoparticles(pSiNPs)with ANA loaded into the pore of pSiNPs and biotin-polyethylene glycol(PEG)surface *** resulting nano-formulation,named Biotin-CaCl2-ANA-pSiNPs(BCAP),delivered a large amount of ANA to the AD brain and ameliorated memory impairment of the AD mouse model through the disaggregation of amyloid plaques in the *** study presents a new bioactive small molecule for amyloid plaque disaggregation and its promising therapeutic nano-platform for AD brain-targeted delivery.

关键词： Alzheimer’s disease Plaques disaggregation Nanotherapeutics Brain-targeted drug delivery Porous silicon nanoparticles

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