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Inorganic shell nanostructures to enhance performance and stability of metal nanoparticles in catalytic applications

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Rare Metals 2020年第7期39卷 767-783页

作者： Inhee Choi Hyeon Kyeong lee Gyoung Woo lee Jiyull Kim Ji Bong joo Department of Life Science University of SeoulSeoul 02504Republic of Korea Division of Chemical Engineering Konkuk UniversitySeoul 05029Republic of Korea

In this article,we review the recent progress and our research activity on the synthesis of inorganic shell nanostructures to enhance the catalytic performance and stability of metal nanoparticles in catalytic ***,we introduce general synthetic strategies for the fabrication of inorganic nanoscale shell layers,including template-assisted sol-gel coating,hydrothermal(or solvothermal)synthesis and the self-templating *** also discuss recent examples of metal nanoparticles(NPs)with nanoscale shell layers,namely core-shell,yolk-shell and multiple NPs-embedded nanoscale *** then discuss the performance and stability of metal particles in practical catalytic ***,we conclude with a summary and perspective on the further progress of inorganic nanostructure with nanoscale shell layers for catalytic applications.

关键词： Nanostructures Inorganic shell Metal nanoparticle Stabilization Performance enhancement Catalyst

Hepatic fat quantification magnetic resonance for monitoring treatment response in pediatric nonalcoholic steatohepatitis

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World Journal of Gastroenterology 2015年第33期21卷 9741-9748页

作者： hong Koh Seung Kim Myung-joon Kim Hyun Gi Kim Hyun joo Shin Mi-Jung lee Department of Pediatrics Severance Pediatric Liver Disease Research GroupSeverance Children’s HospitalYonsei University College of Medicine Department of Radiology and Research Institute of Radiological Science Severance Pediatric Liver Disease Research GroupSeverance Children’s HospitalYonsei University College of Medicine

AIM: To evaluate the possibility of treatment effect monitoring using hepatic fat quantification magnetic resonance(MR) in pediatric nonalcoholic steatohepatitis(NASH).METHODS: We retrospectively reviewed the medical records of patients who received educational recommendations and vitamin E for NASH and underwent hepatic fat quantification MR from 2011 to *** fat fraction(%) was measured using dual- and triple-echo gradient-recalled-echo sequences at *** compliant and non-compliant groups were compared clinically,biochemically,and ***: Twenty seven patients(M:F = 24:3; mean age: 12 ± 2.3 years) were included(compliant group = 22,non-compliant = 5).None of the baseline findings differed between the 2 groups,except for triglyceride level(compliant vs non-compliant,167.7 mg/d L vs 74.2 mg/d L,P = 0.001).In the compliant group,high-density lipoprotein increased and all other parameters decreased after 1-year ***,there were various changes in the non-compliant *** fat fraction(-19.2% vs 4.6,P leecho fat fraction(-13.4% vs 3.5,P < 0.001),alanine aminotransferase(-110.7 IU/L vs-10.6 IU/L,P = 0.047),total cholesterol(-18.1 mg/d L vs 3.8 mg/d L,P = 0.016),and triglyceride levels(-61.3 mg/d L vs 11.2 mg/d L,P = 0.013) were significantly decreased only in the compliant *** change in body mass index and dual-echo fat fraction showed a positive correlation(ρ = 0.418,P = 0.030).CONCLUSION: Hepatic fat quantification MR can be a non-invasive,quantitative and useful tool for monitoring treatment effects in pediatric NASH.

关键词： Nonalcoholic fatty liver disease Steatohepatitis H

Endoscopic diverticulotomy with an isolated-tip needle-knife papillotome (Iso-Tome) and a fitted overtube for the treatment of a Killian-Jamieson diverticulum

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World Journal of Gastroenterology 2008年第42期14卷 6589-6592页

作者： Chang Kyun lee Il-Kwun Chung Ji-Young Park Tae Hoon lee Suck-Ho lee Sang-Heum Park hong-Soo Kim Sun-joo Kim Division of Gastroenterology Department of Internal Medicine Soonchunhyang University College of Medicine Cheonan Hospital Cheonan Choongnam 330-721 South Korea

A Killian-Jamieson diverticulum （KID） is an unfamiliar and rare cervical esophageal diverticulum. This diverticulum originates on the anterolateral wall of the proximal cervical esophagus through a muscular gap （the Killian-Jamieson space） below the cricopharyngeal muscle and lateral to the longitudinal muscle of the esophagus. To date, only surgical treatment has been recommended for a symptomatic KJD due to its close proximity to the recurrent laryngeal nerve and the concern of possible nerve injury. Recently, traditional open surgery for a symptomatic KJD is being challenged by the development of new endoscopic techniques and devices. We present here a case of a symptomatic KID that was successfully treated with the flexible endoscopic diverticulotomy using two new devices. An isolated-tip needle-knife papillotome （Iso-Tome） was used for the dissection of the tissue bridge of the diverticulum. And a flexible overtube with a modified distal end （a fitted overtube） was used for adequate visualization of the tissue bridge of the diverticulum and protection of the surrounding tissue during dissection of the tissue bridge. Our successful experience suggests that the flexible endoscopic diverticulotomy with the use of appropriate endoscopicdevices can be a safe and effective method for the treatment of a symptomatic KJD.

关键词： Esophagus Diverticulum Killian-Jamieson diverticulum Endoscopy Diverticulotomy

Prostate only radiotherapy using external beam radiotherapy:A clinician’s perspective

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World Journal of Clinical Cases 2022年第29期10卷 10428-10434页

作者： Jeong Won lee Mi joo Chung Department of Radiation Oncology Daegu Catholic University School of MedicineDaegu 42472South Korea Department of Radiation Oncology Hanyang University Hanmaeum Changwon HospitalChangwon 51139South Korea

Prostate-only radiotherapy(PORT) is widely used as the definitive treatment for localized prostate *** cancer has an α/β ratio;therefore,radiotherapy(RT) with a large fraction size is biologically effective for tumor *** current external beam RT technique for PORT has been improved from threedimensional conformal RT to intensity-modulated,stereotactic body,and imageguided *** methods are associated with reduced radiation exposure to normal tissues,decreasing urinary and bowel *** trials have shown improved local control with dose escalation through the aforementioned methods,and the efficacy and safety of intensity-modulated and stereotactic body RTs have been ***,the management of RT in patients with prostate cancer has not been fully *** a clinician,there are several concerns regarding the RT volume and dose considering the patient’s age and ***,this review aimed to discuss the radiobiological basis and external beam technical advancements in PORT for localized prostate cancer from a clinician’s perspective.

关键词： Prostate cancer Radiotherapy Radiation dose Radiation technique Radiation volume

Cryptogenic organizing pneumonia associated with pregnancy:A case report

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World Journal of Clinical Cases 2022年第6期10卷 1946-1951页

作者： Young joo lee Young Sun Kim Department of Obstetrics and Gynecology Kyung Hee University Medical CenterSeoul 02447South Korea

BACKGROUND Cryptogenic organizing pneumonia(COP),formerly known as bronchiolitis obliterans organizing pneumonia,is an extremely rare disease in *** this case,we report on COP diagnosed in recurrent pneumonia that does not respond to antibiotics in pregnant *** SUMMARY A 35-year-old woman with no prior lung disease presented with concerns of chest pain with cough,sputum,dyspnea,and mild fever at 11 wk’*** was diagnosed with community-acquired pneumonia and treated with antibiotics;her symptoms improved *** weeks after discharge,she was readmitted with aggravated *** computed tomography demonstrated multifocal patchy airspace consolidation and ground-glass opacities at the basal segments of the right lower lobe,at the lateral basal segment of the lower lobe,and at the lingular segment of the left upper *** lavage revealed an increased lymphocyte count and a decreased CD4/CD8 ***(0.5 mg/kg/d)was administered for 10 d after the second *** improved after 3 d of steroid treatment and other symptoms improved on the 5th day of steroid ***-delivery transbronchial lung biopsy further revealed the presence of granulation tissue with fibroblasts in smallbronchiole *** This case suggests that it is important to differentiate COP from atypical pneumonia in the deteriorated condition despite antibiotic treatment.

关键词： Antibiotics Bronchiolitis obliterans organizing pneumonia Corticosteroid Cryptogenic organizing pneumonia Pregnancy Case report

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

Some remarks on one-sided regularity

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Frontiers of Mathematics in China 2018年第4期13卷 833-847页

作者： Tai Keun KWAK Yang lee Young joo SEO Department of Mathematics Daejin University Pocheon 11159 Korea Institute of Basic Science Daejin University Pocheon 11159 Korea Department of Mathematics Hanyang University Seoul 04763 Korea

A ring is said to be right （resp., left） regular-duo if every right （resp., left） regular element is regular. The structure of one-sided regular elements is studied in various kinds of rings, especially, upper triangular matrix rings over one-sided Ore domains. We study the structure of （one-sided） regular-duo rings, and the relations between one-sided regular-duo rings and related ring theoretic properties.

关键词： right (left) regular element right (left) regular-duo ring uppertriangular matrix ring right (left) Ore domain

Effect of polyethylene glycol on electrochemically deposited trivalent chromium layers

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中国有色金属学会会刊：英文版 2009年第4期19卷 819-823页

作者： joo-Yul lee Man KI M Sik-Chol KWON Department of Surface Technology Korea Institute of Materials Science

The structural characteristics of the trivalent chromium deposits and their interfacial behavior in the plating solution with and without polyethylene glycol molecules were observed by using various electrochemical methods such as cyclic voltammetry,open circuit potential transition,electrochemical impedance spectroscopy,scanning electron microscopy and X-ray photoelectron *** is shown that the polyethylene glycol molecules make the reductive current density lower in the trivalent chromium plating system and promote a hydrogen evolution reaction through their adsorption on the electrode *** the trivalent chromium layer formed from the polyethylene glycol-containing solution has somewhat higher density of cracks on its surface and results in a lower film resistance,lower polarization resistance,and higher capacitance in a corrosive *** is also revealed that the formation of chromium carbide layer is facilitated in the presence of polyethylene glycol,which means easier electrochemical codeposition of chromium and carbon,not single chromium deposition.

关键词：聚乙二醇电沉积层三价铬扫描电子显微镜电化学阻抗谱电极表面电化学方法乙二醇溶液

A neural network model for high entropy alloy design

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npj Computational Materials 2023年第1期9卷 1734-1746页

作者： Jaemin Wang Hyeonseok Kwon Hyoung Seop Kim Byeong-joo lee Department of Materials Science and Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Graduate Institute of Ferrous and Energy materials Technology(GIFT) Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Center for Heterogenic Metal Additive Manufacturing Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Institute for Convergence Research and Education in Advanced Technology Yonsei UniversitySeoul 03722Republic of Korea Advanced Institute for Materials Research(WPI-AIMR) Tohoku UniversitySendai 980-8577Japan

A neural network model is developed to search vast compositional space of high entropy alloys(HEAs).The model predicts the mechanical properties of HEAs better than several other ***’s because the special structure of the model helps the model understand the characteristics of constituent elements of *** addition,thermodynamics descriptors were utilized as input to the model so that the model predicts better by understanding the thermodynamic properties of HEAs.A conditional random search,which is good at finding local optimal values,was selected as the inverse predictor and designed two HEAs using the *** experimentally verified that the HEAs have the best combination of strength and ductility and this proves the validity of the model and alloy design *** strengthening mechanism of the designed HEAs is further discussed based on microstructure and lattice distortion *** present alloy design approach,specialized in finding multiple local optima,could help researchers design an infinite number of new alloys with interesting properties.

关键词： alloy alloys microstructure