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Influence of Zn and Mg Alloying on the Corrosion Resistance Properties of Al Coating Applied by Arc Thermal Spray Process in Simulated Weather Solution

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Acta Metallurgica Sinica(English Letters) 2018年第6期31卷 591-603页

作者： han-seung lee seung-Jun Kwon Jitendra Kumar Singh Mohamed A.Ismail Department of Architectural Engineering Hanyang University Department of Civil Engineering Hannam University Department of Civil and Construction Engineering Faculty of Engineering and ScienceCurtin University Malaysia

In this study,Al–Zn and Al–Mg coatings were deposited on steel substrates by an arc thermal spray process.X-ray diffraction and scanning electron microscopy were used to characterize the deposited coatings and corrosion *** circuit potential（OCP）,electrochemical impedance spectroscopy,and potentiodynamic studies were used to assess the corrosion characteristics of these coatings after exposure according to the Society of Automotive Engineers（SAE）J2334 solution of varying *** solution simulates an industrial environment and contains chloride and carbonate ions that induce corrosion of the deposited ***,the Al–Mg alloy coating maintained an OCP of approximately-0.911 V versus Ag/Ag Cl in the SAE J2334 solution even after 792 h of *** indicates that it protects the steel sacrificially,whereas the Al–Zn coating provides only barrier-type protection through the deposition of corrosion *** Al–Mg coating acts as a self-healing coating and provides protection by forming Mg_6Al_2（OH）_（16）CO_3（Al–Mg layered double hydroxides）.Mg_6Al_2（OH）_（16）CO_3has interlocking characteristics with a morphology of plate-like nanostructures and an ion-exchange ability that can improve the corrosion resistance properties of the *** presence of Zn in the corrosion products of the Al–Zn coating allows dissolution,but,at the same time,Zn_5（OH）_6（CO_3）_2and Zn_6Al_2（OH）_（16）CO_3are formed and act to reduce the corrosion rate.

关键词： Self-healing coating Corrosion Arc thermal spray Electrochemical impedance spectroscopy

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一切从“简”一切从“简”

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现代装饰（家居） 2012年第10期 118-123页

作者： Curtis Micklish seung han lee Danya CHILEAN DESIGN

在一个过度消耗的时代里,人们对物质追求的欲望早已超越了生活本身,无止境的物质追求使我们的生态环境每况愈下,而环境一旦遭到破坏是无法逆转的。事实上,我们完全可以用另外一种方式,让生活变得简单。那么,我们可以首先从家居环境入手... 详细信息

在一个过度消耗的时代里,人们对物质追求的欲望早已超越了生活本身,无止境的物质追求使我们的生态环境每况愈下,而环境一旦遭到破坏是无法逆转的。事实上,我们完全可以用另外一种方式,让生活变得简单。那么,我们可以首先从家居环境入手,将简约的设计引入生活,打造无压力感的居室环境。利用简约的家具,让我们的生活变得既时尚又轻松,同时保持不失细节的品质。本期家具栏目为大家呈现的简约风格家具作品分别来自美国CurtisMicklish、韩国设计师seung han lee,以及来自智利的CHILEANDESIGN设计联盟。从他们的设计中能看到具有极高观赏性的艺术造型家具,也能从中了解到简约家具制作材料的创新及工艺的突破。

关键词：家居环境居室环境物质追求艺术造型压力感生态环境简约风格外部造型全手工形式组合

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Macrophage activation syndrome in children with Kawasaki disease: diagnostic and therapeutic approaches

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World Journal of Pediatrics 2020年第6期16卷 566-574页

作者： seung Beom han Soo-Young lee Department of Pediatrics Daejeon St.Mary's Hospital.College of MedicineThe Catholic University of Korea64 Daeheung-ro.Jung-guDaejeon 34943Republic of Korea Department of Pediatrics.Bucheon St.Mary's Hospital College of MedicineThe Catholic University of Korea327 Sosa-roWonmi-gu.Bucheon 14647Republic of Korea

Background Macrophage activation syndrome(MAS)is a rare,life-threatening complication of Kawasaki disease(KD).Early recognition and treatment of MAS are very important,but sometimes it is difficult to distinguish MAS from a severe form of *** sources A PubMed search was performed in Clinical Queries using the key terms“macrophage activation syndrome or secondary hemophagocytic lymphohistiocytosis(HLH)”and“Kawasaki disease”.Results KD patients with MAS show high intravenous immunoglobulin(IVIG)resistance and coronary *** is also as high as MAS in other *** fever greater than 10 days is highly associated with development of MAS in *** is observed in more than two-thirds of KD patients with *** is often the earliest laboratory finding of *** is highly specific and sensitive for detecting MAS in KD;so,ferritin levels should be checked if there are unexplained clinical exacerbations in KD *** the under-recognition of MAS in KD,it is prudent to consider resistant KD as occult/subclinical *** KD patients with MAS have good outcomes on immune ***,if KD patients fulfill the HLH-2004 diagnostic criteria,they may undergo longer and more intensive treatment than *** The possible existence of MAS should be taken into account when a KD patient shows persistent fever,splenomegaly,thrombocytopenia,hyperferritinemia,or IVIG *** under-diagnosis of MAS in patients with KD is an important issue to be ***,however,there is a possibility of over-treatment of MAS in patients with KD.

关键词： Macrophage activation syndrome Kawasaki disease Children

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Absorption-Dominant mmWave EMI Shielding Films with Ultralow Reflection using Ferromagnetic Resonance Frequency Tunable M-Type Ferrites

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Nano-Micro Letters 2023年第6期15卷 1-23页

作者： Horim lee seung han Ryu Suk Jin Kwon Jae Ryung Choi Sang‑bok lee Byeongjin Park Composites Research Division Korea Institute of Materials Science797 ChangwondaeroSeongsan‑GuChangwonGyeongsangnam‑Do 51508Republic of Korea

Although there is a high demand for absorption-dominant electromagnetic interference(EMI) shielding materials for 5G millimeter-wave(mmWave) frequencies, most current shielding materials are based on reflection-dominant conductive materials. While there are few absorption-dominant shielding materials proposed with magnetic materials, their working frequencies are usually limited to under 30 GHz. In this study, a novel multi-band absorption-dominant EMI shielding film with M-type strontium ferrites and a conductive grid is proposed. This film shows ultralow EMI reflection of less than 5% in multiple mmWave frequency bands with sub-millimeter thicknesses, while shielding more than 99.9% of EMI. The ultralow reflection frequency bands are controllable by tuning the ferromagnetic resonance frequency of M-type strontium ferrites and composite layer geometries. Two examples of shielding films with ultralow reflection frequencies, one for 39 and 52 GHz 5G telecommunication bands and the other for 60 and 77 GHz autonomous radar bands, are presented. The remarkably low reflectance and thinness of the proposed films provide an important advancement toward the commercialization of EMI shielding materials for 5G mmWave applications.

关键词： 5G communication MmWave EMI shielding M-type ferrites

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Antibiotic use in children with Kawasaki disease

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World Journal of Pediatrics 2018年第6期14卷 621-622页

作者： seung Beom han Soo-Young lee Department of Pediatrics St.Paul’s HospitalCollege of MedicineThe Catholic University ofK orea180 Wangsan-roDongdaemun-guSeoul 02559RepublicofK orea

As the diagnostic criteria for Kawasaki disease (KD) consist of the clinical features that are shared by other childhood febrile illnesses [1, 2], KD is sometimes confused with a bacterial infection, leading to clinical situations in which children with the disease receive antibiotics (3–5)Here, we report the extent of antibiotic use in children with KD and the clinical parameters confusing KD with a bacterial infection.

关键词： Antibiotic children Kawasaki disease

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Prognostic implication of isolated tumor cells and micrometastases in regional lymph nodes of gastric cancer

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World Journal of Gastroenterology 2005年第38期11卷 5920-5925页

作者： Hye seung lee Min A Kim han-Kwang Yang Byung Lan lee Woo Ho Kim Department of Pathology Department of Pathology and Cancer Research Institute Department of Surgery and Cancer Research Institute Department of Anatomy

AIM： To determine the prognostic significance of isolated tumor cells （ITCs） and lymph node micrometastases in gastric cancer. METHODS： Hematoxylin and eosin-stained slides of lymph node dissections of 632 consecutive gastric cancers were reviewed. Cytokeratin immunostaining was performed in 280 node-negative cases and 5 cases indefinite for lymph node metastases. Lymph node metastases were divided into ITCs, micrometastases, or macrometastases, according to the sizes of tumor deposits in largest dimension. ITCs were further classified into four groups according to metastasis pattern. RESULTS： Lymph node metastases were identified by immunostaining in 58 of 280 node-negative cases （20.7%） and were not significantly associated with patient survival （P = 0.3460）. After cytokeratin immunostaining, 196 cases were classified as pN1, which consisted of 20 cases with micrometastases detected by immunostaining （pNlmi（i＋））, 34 cases with only micrometastases （pNlmi）, and 142 cases with pN1 with one or more macrometastases （pN1）. Cases with pNlmi and pNlmi（i＋） had a significantly better prognosis than the cases with pN1 （P = 0.0037）. ITCs were found in 38 of these 58 cases, and could be divided into four groups： 12 cases with only a single cell pattern, 7 cases with multiple individual cells, 5 cases with single small cluster, and 14 cases with multiple small clusters. Among these four groups, cases with ITCs of multiple individual cell pattern showed the worst survival （median survival： 28 mo, P〈0.0001）.CONCLUSION： Both size and pattern of lymph node metastases can give prognostic information on the survival of gastric cancer patients.

关键词： Immunohistochemistry Cytokeratin Patientsurvival Lymph node metastasis

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Effect of Plastic Anisotropy on the Formability of Aluminum 6016-T4 Sheet Material

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Chinese Journal of Mechanical Engineering 2017年第3期30卷 625-631页

作者： Young-Suk KIM seung-han YANG kyungpook national university Daegu 41566Republic of Korea

Sheet metal formed of lightweight materials such as aluminum sheeting has received great attention related to the reduction of vehicle emissions. This paper evaluates the anisotropic yield locus using Kuwabara＇s biaxial tensile tester and stretches formability using Hecker＇s hemispheri- cal punch stretching test for aluminum 6016-T4 sheet material. The anisotropic yield locus of the A16016-T4 sheet measured is fitted well by the modified Drucker yield func- tion. Moreover the best fitting to the experimental stress- strain curve from the tensile test was obtained by taking an appropriate hardening model. Analytical study to predict the stretch formability by using Hora＇s Modified Maximum Force Criterion （MMFC） was performed. The predicted forming limit curves （FLC） based on various yield functions were compared with the experiments and discussed.

关键词： Anisotropic yield function AluminumA16016-T4 Biaxial tensile test Forming limit curve

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Electrochemical characteristics of HVOF spray coated layer with WC-27NiCr and WC-10Co4Cr for Al bronze

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中国有色金属学会会刊：英文版 2012年第S3期22卷 753-759页

作者： Min-su han seung-jun lee Min-sung KIM Seok-ki JANG Seong-jong KIM Division of Marine Engineering Mokpo Maritime University

Among the environmentally friendly marine energies,tidal current power plants require low cost because they do not need to construct a large *** power is particularly reliable energy source because the power generation capacity is predictable regardless of weather or *** materials or stainless steel have been used as materials of blades for current power ***,their strength and welding performance generated many problems in field *** alloys with excellent cavitation resistance and corrosion resistance were applied as blade materials to improve the durability of copper *** were coated with WC-27NiCr and WC-10Co4Cr using the high velocity oxy-fuel (HVOF) *** metal spray coating technology has the advantage in terms of the selection of materials for cost effectiveness and environmental effects of corrosion because the properties of the coat layer can be controlled *** with WC-27NiCr and WC-10Co4Cr by HVOF,WC-27NiCr shows better corrosion resistance *** reason for this seems to be that corrosion resistance improves and a stable passive film forms due to the effects of Ni and Cr.

关键词： tidal power copper alloys HVOF coating corrosion resistance

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Ultra-thin light-weight laser-induced-graphene (LIG) diffractive optics

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Light(Science & Applications) 2023年第7期12卷 1268-1300页

作者： Younggeun lee Mun Ji Low Dongwook Yang han Ku Nam Truong-Son Dinh Le seung Eon lee Hyogeun han seunghwan Kim Quang Huy Vu Hongki Yoo Hyosang Yoon Joohyung lee Suchand Sandeep Keunwoo lee seung-Woo Kim Young-Jin Kim Department of Mechanical Engineering Korea Advanced Institute of Science and Technology(KAIST)Daehak-roYuseong-guDaejeon 34141Republic of Korea School of Mechanical and Aerospace Engineering Nanyang Technological University(NTU)50 Nanyang Avenue639798 SingaporeSingapore Panasonic Factory Solutions Asia Pacific(PFSAP) 285 Jalan Ahmad Ibrahim639931 SingaporeSingapore Department of Aerospace Engineering Korea Advanced Institute of Science and Technology(KAlST)Daehak-roYuseong-guDaejeon 34141Republic of Korea Department of Mechanical System Design Engineering Seoul National University of Science and Technology(Seuoltech)232 Gongneung-roNowon-guSeoul 01811Republic of Korea LASER N GRAPN INC 193 Munj-roYuseong-guDaejeon 34051Republicof Korea

The realization of hybrid optics could be one of the best ways to fulfll the technological requirements of compact,light-weight,and multi-functional optical systems for modern *** diffractive lens(PDL)such as diffractive lenses,photonsieves,and metasurfaces can be patterned on ultra-thin flexible and stretchable substrates and be conformally attached on top of arbitrarily shaped *** this review,we introduce recent research works addressed to the design and manufacturing of ultra-thin graphene optics,which will open new markets in compact and light-weight optics for next-generation endoscopic brain imaging,space internet,real-time surface proflometry,and multi-functional mobile *** provide higher design flexibility,lower process complexity,and chemical-free process with reasonable investment cost,direct laser writing(DLW)of laser-induced-graphene(LIG)is actively being applied to the patterning of *** realizing the best optical performances in DLW,photon-material interactions have been studied in detail with respect to different laser parameters;the resulting optical characteristics have been evaluated in terms of amplitude and phase.A series of exemplary laser-written 1D and 2D PDL structures have been actively demonstrated with different base materials,and then,the cases are being expanded to plasmonic and holographic *** combination of these ultra-thin and light-weight PDL with conventional bulk refractive or reflective optical elements could bring together the advantages of each optical *** integrating these suggestions,we suggest a way to realize the hybrid PDL to be used in the future micro-electronics surface inspection,biomedical,outer space,and extended reality(XR)industries.

关键词： optics weight holographic

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Estimating the production and mortality of fine roots using minirhizotrons in a Pinus densiflora forest in Gwangneung,Korea

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Journal of Forestry Research 2016年第5期27卷 1029-1035页

作者： seung Hyun han Soonjin Yun Jongyeol lee Seongjun Kim hanna Chang Yowhan Son Department of Environmental Science and Ecological Engineering Graduate SchoolKorea University Department of Forest Conservation Korea Forest Research Institute Department of Biological and Environmental Sciences Qatar University

The aim of this study was to estimate fine root production （FP） and fine root mortality （FM） at 0-10, 10-20, and 20-30 cm soil depths using minirhizotrons in a 75-year-old Pinus densiflora Sieb. et Zucc. forest located in Gwangneung, Korea. We developed the conversion factors （frame cm-2） of three soil depths （0.158 for 0-10 cm, 0.120 for 10-20 cm, and 0.131 for 20-30 cm） based on soil coring and minirhizotron data. FP and FM were estimated using conversion factors from March 26, 2013 to March 2, 2014. The annual FP and FM values at the 0-30 cm soil depth were 3200.2 and 2271.5 kg ha-1 yr -1, respectively. The FP estimate accounted for approximately 17 % of the total net primary production at the study site. FP was highest in summer （July 31-September 26）, and FM was highest in autumn （September 27-November 29）. FP was positively correlated with seasonal change in soil temperature, while FM was not related to that change. The sea- sonality of FP and FM might be linked to above-ground photosynthetic activity. Both FP and FM at the 0-10 cm depth were significantly higher than at 10-20 and 20-30 cm depths, and this resulted from the decrease in nutrient availability with increasing soil depth. The minirhizotron approach and conversion factors developed in this study will enable fast and accurate estimation of the fine root dynamics in P. densiflora forest ecosystems.

关键词： Conversion factor Fine root Minirhizotron Mortality Production

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