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Ultrasonic Approach of Rayleigh Pitch-Catch Contact Ultrasound Waves on CFRP Laminated Composites

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Journal of Materials Science & Technology 2008年第3期24卷 407-409页

作者： In-Young Yang Kwang-Hee Im Uk Heo David K Hsu Je-Woong Park hak-Joon Kim Sung-Jin Song School of Mechanical Eng. Chosun Univ Department of Automotive Eng. Woosuk Univers-ity Center for Nondestructive Evaluation Iowa State University Dept.of Naval Arch.and Ocean Eng. Chosun Univ School of Mechanical Eng. Sungkyunkwan University

CFRP （carbon fiber reinforced plastics） composite materials have wide applicability because of their inherent design flexibility and improved material properties. However, impacted composite structures have 50%-75% less strength than undamaged structures. In this work, a CFRP composite material was nondestructively characterized in order to ensure product quality and structural integrity of CFRP and one-sided pitch-catch technique was developed to measure impacted-damaged area by using an automated-data acquisition system in an immersion tank. A pitch-catch signal was found to be more sensitive than normal incidence backwall echo of longitudinal wave under defect conditions in the composite.

关键词： Impact damages C-scanner Carbon fiber reinforced plastics (CFRP) Pitchcatch mode

Electrodeposited copper oxides with a suppressed interfacial amorphous phase using mixed-crystalline ITO and their enhanced photoelectrochemical performances

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Journal of Energy Chemistry 2023年第7期82卷 277-286,I0007页

作者： Ji Hoon Choi Hae-Jun Seok Dongchul Sung Dong Su Kim hak Hyeon Lee Suklyun Hong Han-Ki Kim Hyung Koun Cho School of Advanced Materials Science and Engineering Sungkyunkwan University2066Seobu-roJangan-guSuwon-siGyeonggi-do 16419Republic of Korea Department of Physics Graphene Research Instituteand GRI-TPC International Research CenterSejong UniversitySeoul 05006Republic of Korea

The effectiveness of photoelectrochemical(PEC)water splitting is significantly restricted by insufficient light harvesting,rapid charge recombination,and slow water reduction *** the presence of amorphous phases in the interfaces hinders the overcome of these inherent limitations,a photoelectrode must be built ***,we artificially controlled the crystallographic orientation of indium tin oxide(ITO)to determine the orientation with the smallest lattice mismatch at the Cu_(2)O interface,thus significantly reducing the amorphous phase in the early stage of electrodeposition ***[222]/[400]mixed orientation ITO primarily exposed the{400}surface planes and accelerated charge transfer by forming an optimal interface with preferentially grown(111)oriented Cu_(2)O and minimized amorphous *** addition,the ITO surface energy was calculated using density functional theory to theoretically verify which plane is more active for growing the photoactivation *** rationally designed ITO/Cu_(2)O/Al-dope Zn O/TiO_(2)/Rh-P device,with each layer serving a specific purpose,achieved a photocurrent density of 8.23 mA cm^(-2)at 0 VRHEunder AM 1.5 G illumination,providing a standard method for effective solar-to-hydrogen conversion photocathodes.

关键词： Photoelectrochemical water splitting Cu_(2)O ITO Hydrogen Surface energy DFT

“Listening to the Sounds of the Water”:Bringing Together Local Knowledge and Biophysical Data to Understand Climate-Related Hazard Dynamics

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International Journal of Disaster Risk Science 2021年第3期12卷 326-340页

作者： Natasha Pauli Mark Williams Savuti Henningsen Kevin Davies Chanchhaya Chhom Floris van Ogtrop Sochanny hak Bryan Boruff Andreas Neef UWA School of Agriculture and Environment The University of Western AustraliaCrawleyWestern Australia 6009Australia Department of Geography and Planning School of Social SciencesThe University of Western AustraliaCrawleyWestern Australia 6009Australia School of Geosciences The University of SydneySydneyNew South Wales 2006Australia Faculty of Development Studies Royal University of Phnom PenhPhnom Penh 12150Cambodia School of Life and Environmental Sciences The University of SydneySydneyNew South Wales 2006Australia Development Studies School of Social SciencesThe University of AucklandAuckland 1142New Zealand

Integrating local knowledge and scientific information can aid in co-developing locally relevant approaches for climate change adaptation and disaster risk *** along the Mekong River have adapted to variability in temperature,rainfall,and flooding patterns over *** environmental change in the Mekong Basin presents a new set of challenges related to drought,altered seasonal rainfall,more frequent high-flow flood events,and water withdrawals for hydropower and *** present a multi-method approach to understand how local knowledge of the spatial and temporalpatterns of floods,droughts,and rainfall can be integrated with scientific information along a flood-prone section of the lower Mekong River in Kratie Province,*** hazard mapping of community members’knowledge of the movement of floodwaters through the landscape enabled interpretation of flood extent mapping using Synthetic Aperture Radar images from the Sentinel-1A *** calendars of weather patterns and livelihood activities,together with local indicators of flooding,rainfall,and drought were compared with trends in 35 years of rainfall data,and highlighted"pressure points"at the beginning and end of the rainy season where agriculture may be particularly impacted by climate *** discuss potential applications of our findings for adaptation and hazard planning.

关键词： Cambodia Local knowledge Mekong River Natural hazards Participatory mapping Remote sensing

Highly Aligned Ternary Nanofiber Matrices Loaded with MXene Expedite Regeneration of Volumetric Muscle Loss

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Nano-Micro Letters 2024年第4期16卷 269-292页

作者： Moon Sung Kang Yeuni Yu Rowoon Park Hye Jin Heo Seok Hyun Lee Suck Won Hong Yun hak Kim Dong‑Wook Han Department of Cogno‑Mechatronics Engineering College of Nanoscience and NanotechnologyPusan National UniversityBusan 46241Republic of Korea Medical Research Institute School of MedicinePusan National UniversityYangsan 50612Republic of Korea Department of Anatomy School of MedicinePusan National UniversityYangsan 50612Republic of Korea Engineering Research Center for Color‑Modulated Extra‑Sensory Perception Technology Pusan National UniversityBusan 46241Republic of Korea Department of Biomedical Informatics School of MedicinePusan National UniversityYangsan 50612Republic of Korea Periodontal Disease Signaling Network Research Center and Dental and Life Science Institute School of DentistryPusan National UniversityYangsan 50612Republic of Korea BIO‑IT Fusion Technology Research Institute Pusan National UniversityBusan 46241Republic of Korea Present Address:Osstem Implant Inc. Seoul 07789Republic of Korea

Current therapeutic approaches for volumetric muscle loss(VML)face challenges due to limited graft availability and insufficient *** overcome these limitations,tissue-engineered scaffolds have emerged as a promising *** this study,we developed aligned ternary nanofibrous matrices comprised of poly(lactide-co-ε-caprolactone)integrated with collagen and Ti_(3)C_(2)T_(x)MXene nanoparticles(NPs)(PCM matrices),and explored their myogenic potential for skeletal muscle tissue *** PCM matrices demonstrated favorable physicochemical properties,including structural uniformity,alignment,microporosity,and *** vitro assays revealed that the PCM matrices promoted cellular behaviors and myogenic differentiation of C2C12 ***,in vivo experiments demonstrated enhanced muscle remodeling and recovery in mice treated with PCM matrices following VML *** insights from next-generation sequencing revealed that MXene NPs facilitated protein and ion availability within PCM matrices,leading to elevated intracellular Ca^(2+)levels in myoblasts through the activation of inducible nitric oxide synthase(i NOS)and serum/glucocorticoid regulated kinase 1(SGK1),ultimately promoting myogenic differentiation via the m TOR-AKT ***,upregulated i NOS and increased NO–contributed to myoblast proliferation and fiber fusion,thereby facilitating overall myoblast *** findings underscore the potential of MXene NPs loaded within highly aligned matrices as therapeutic agents to promote skeletal muscle tissue recovery.

关键词： Ti_(3)C_(2)T_(x)MXene nanoparticle Ternary nanofibrous matrices Myogenesis Regeneration of volumetric muscle loss Next generation sequencing

Novel predictors for lymph node metastasis in submucosal invasive colorectal carcinoma

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World Journal of Gastroenterology 2017年第32期23卷 5936-5944页

作者： Kwangil Yim Daeyoun David Won In Kyu Lee Seong-Taek Oh Eun Sun Jung Sung hak Lee Department of Hospital Pathology Seoul St.Mary’s HospitalCollege of MedicineThe Catholic University of Korea Department of Surgery Seoul St.Mary’s HospitalCollege of MedicineThe Catholic University of Korea Department of Surgery Uijeongbu St.Mary’s HospitalCollege of MedicineThe Catholic University of Korea

AIM To evaluate a novel grading system to predict lymph node metastasis(LNM) in patients with submucosal invasive colorectal carcinoma(SICRC).METHODS We analyzed the associations between LNM and various clinicopathological features in 252 patients with SICRC who had undergone radical surgery at the Seoul Saint Mary's hospital between 2000 and *** LNM was observed in 31 patients(12.3%). The depth and width of the submucosal invasion, lymphatic invasion, tumor budding, and the presence of poorly differentiated clusters(PDCs) were significantly associated with the incidence of LNM. Using multivariate analysis, the receiver operating characteristic curvewas calculated and the area under curve(AUC) was used to compare the ability of the different parameters to identify the risk of LNM. The most powerful clinicopathological parameter for predicting LNM was lymphatic invasion(difference AUC = 0.204), followed by the presence or absence of tumor budding(difference AUC = 0.190), presence of PDCs(difference AUC = 0.172) and tumor budding graded by the Ueno method(difference AUC = 0.128). CONCLUSION Our results indicate that the tumor budding and the depth multiplied by the width measurements of submucosal invasion can provide important information for patients with SICRC.

关键词： Colorectal cancer Neoplasm invasion Lymph node Metastasis

Analytical solution for one-dimensional nonlinear consolidation of saturated multi-layered soil under time-dependent loading

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Journal of Ocean Engineering and Science 2021年第1期6卷 21-29页

作者： Pyol Kim Hyong-Sik Kim Chol-U Pak Chung-Hyok Paek Gun-Hyang Ri hak-Bom Myong Faculty of Geology Kim Il Sung UniversityPyongyang 999093Democratic People’s Republic of Korea

This paper presents analytical solutions for one-dimensional nonlinear consolidation of saturated multi-layered soil under time-dependent *** solutions are derived for one-dimensional nonlinear consolidation of multi-layered soil subjected to constant loading and ramp *** proposed solutions are verified through the comparison with the existing solutions for double-layered soil and singlelayered soil,which shows the proposed solutions are more general ones for one-dimensional nonlinear consolidation of saturated soils subjected to time-dependent *** on the proposed solutions,nonlinear consolidation behavior of saturated multi-layered soil under time-dependent loading is investigated.

关键词： Saturated soil Multi-layered Nonlinear consolidation Analytical solution

NLRP3 inflammasome activation and NETosis positively regulate each other and exacerbate proinflammatory responses:implications of NETosis inhibition for acne skin inflammation treatment

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Cellular & Molecular Immunology 2024年第5期21卷 466-478页

作者： Hyo Jeong Kim Yun Sang Lee Bok-Soon Lee Chang-hak Han Sang Gyu Kim Chul-Ho Kim Department of Otolaryngology School of MedicineAjou UniversitySuwonRepublic of Korea Department of Molecular Science and Technology Ajou UniversitySuwonRepublic of Korea

Inflammasomes are multiprotein complexes involved in the host immune response to pathogen ***,inflammasomes participate in many conditions,such as ***,it was shown that NETosis,a type of neutrophil cell death,is induced by bacterial infection and is involved in inflammatory diseases such as delayed wound healing in patients with ***,the relationship between inflammasomes and NETosis in the pathogenesis of inflammatory diseases has not been well *** this study,we determined whether NETosis is induced in ***-induced skin inflammation and whether activation of the nucleotide-binding domain,leucine-rich family,and pyrin domain-containing-3(NLRP3)inflammasome is one of the key factors involved in NETosis induction in a mouse model of acne skin *** found that NETosis was induced in ***-induced skin inflammation in mice and that inhibition of NETosis ameliorated ***-induced skin *** addition,our results demonstrated that inhibiting inflammasome activation could suppress NETosis induction in mouse *** results indicate that inflammasomes and NETosis can interact with each other to induce ***-induced skin inflammation and suggest that targeting NETosis could be a potential treatment for inflammasome-mediated diseases as well as NETosis-related diseases.

关键词： P.acnes NETosis NLRP3 inflammasome Skin inflammation

Surgical palliation of unresectable pancreatic head cancer in elderly patients

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World Journal of Gastroenterology 2009年第8期15卷 978-982页

作者： Sang Il Hwang Hyung Ook Kim Byung Ho Son Chang hak Yoo Hungdai Kim Jun Ho Shin Department of Surgery Kangbuk Samsung Hospital Sungkyunkwan University School of Medicine Seoul 110-746 South Korea

AIM: To determine if surgical biliary bypass would provide improved quality of residual life and safe palliation in elderly patients with unresectable pancreatic head cancer. METHODS: Nineteen patients, 65 years of age or older, were managed with surgical biliary bypass (Group A). These patients were compared with 19 patients under 65 years of age who were managed with surgical biliary bypass (Group B). In addition, the results for group A were compared with those obtained from 17 patients, 65 years of age or older (Group C), who received percutaneous transhepatic biliary drainage to evaluate the quality of residual life. RESULTS: Five patients (26.0%) in Group A had complications, including one intraabdominal abscess, one pulmonary atelectasis, and three wound infections. One death (5.3%) occurred on postoperative day 3. With respect to morbidity, mortality, and postoperative hospitalization, no statistically significant difference was noted between Groups A and B. The number of readmissions and the rate of recurrent jaundice were lower in Group A than in Group C, to a statistically significant degree (P = 0.019, P = 0.029, respectively). The median hospital-free survival period and themedian overall survival were also signifi cantly longer in Group A (P = 0.001 and P < 0.001, respectively). CONCLUSION: Surgical palliation does not increase the morbidity or mortality rates, but it does increase the survival rate and improve the quality of life in elderly patients with unresectable pancreatic head cancer.

关键词： Adenocarcinoma Elderly Palliative surgery Pancreas neoplasms

Text-mining analysis using national R&D project data of South Korea to investigate innovation in graphene environment technology

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International Journal of Innovation Studies 2023年第1期7卷 87-99页

作者： Ji Yeon Lee Jung Woo Choi Jae-hak Choi Byeong-Hee Lee NTIS Center Korea Institute of Science and Technology InformationDaejeon34141South Korea Department of Science and Technology Management Policy University of Science and TechnologyDaejeon34113South Korea Department of Polymer Science and Engineering Chungnam National UniversityDaejeon34134South Korea

This study investigates the possibilities offered by the development of graphene environment technology that can contribute to new and effective approaches for the transition to an ecologically benign *** analyze the research and development progress in graphene environment technology,graphene environment technology research trends of South Korea for the years 2009e2020 are investigated by acquiring information pertaining to national research and development projects related to graphene environment technology from the National Science and Technology Information *** structured and unstructured data are analyzed using diverse text-mining methods,such as keyword frequency analysis,association rule mining,and topic *** results indicate that graphene research in South Korea is focused primarily on graphene use in batteries and energy-storage devices,such as solar cells,fuel cells,and secondary *** study can help understand the manner by which the South Korean government has been investing in the research and development of graphene environment technology;additionally,it discusses the future applications and prospects of graphene for the next decade.

关键词： Graphene technology Environmental transition National R&D project information Text mining Trend analysis