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Formation of interfacial brittle phases sigma phase and IMC in hybrid titanium-to-stainless steel joint

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Transactions of Nonferrous Metals Society of China 2011年第A1期21卷 7-11页

作者： Min Ku lee Jung Gu lee Jong Keuk lee Sung Mo HONG Sang Hoon lee Jin Ju PARK Jae woo KIM Chang Kyu RHEE Nuclear Materials Research Division Korea Atomic Energy Research Institute Daejeon 305-353 Korea

The microstructures of the brazed joints for commercially pure Ti and stainless steel were investigated by the applications of various filler alloys including Ag-, Ti-, Zr- and Ni-based alloys. Generally, the dissimilar joints between Ti and stainless steel were dominated by the Ti-based intermetallic compounds （IMCs）, e.g. （Ti, Zr）2（Fe, Ni）, TiFe, TiCu, and Ti2（Fe, Ni）, due to a significant dissolution of Ti from the base metal. The （Fe-Cr） cr phase was also observed near the stainless steel due to a segregation of Cr into the interface region. This research demonstrates empirically that the brittleness of the Ti and stainless steel joint can not be avoided only by applying single braze alloy or single insert metal, and thus an introduction of additional suitable interlayer between the filler alloy and the base metal is necessary to prevent the brittleness of the joint.

关键词： brazing titanium stainless steel intermetallic compounds (IMCs)

Collision tumor of the rectum: A case report of metastatic gastric adenocarcinoma plus primary rectal adenocarcinoma

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World Journal of Gastroenterology 2006年第34期12卷 5569-5572页

作者： Young-Hoon Roh Hyoun-wook lee Min-Chan Kim Kyeong-woo lee Mee-Sook Roh Department of Surgery Dong-A University College of Medicine Busan 602-715 South Korea Department of Pathology Dong-A University College of Medicine Busan 602-715 South Korea Department of Rehabilitation Medicine Dong-A University College of Medicine Busan 602-715 South Korea Department of Pathology Dong-A University College of Medicine Busan 602-715 South Korea Medical Research Center for Cancer Molecular Therapy Dong-A University College of Medicine Busan 602-715 South Korea

Collision tumors are thought to arise from the accidental meeting and interpenetration of two independent tumors. We report here a highly unusual case of a 61-year old man who had a unique tumor that was composed of a metastatic adenocarcinoma from the stomach to the rectum, which harbored a collision tumor of primary rectal adenocarcinoma. The clonalities of the two histologically distinct lesions of the rectal mass were confirmed by immunohistochemical and molecular analysis. Although histologic examination is the cornerstone in pathology, immunohistochemical and molecular analysis can provide evidence regarding whether tumors originate from the same clone or different clones. To the best of our knowledge, this is the fi rst reported case of such an occurrence.

关键词： Collision tumor Rectum Clonality

A Furan-Substituted Polymeric Hole-Transporting Material for Energy Level Regulation and Less Planarity in Colloidal Quantum Dot Solar Cells

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Energy & Environmental Materials 2023年第5期6卷 340-346页

作者： Jun woo lee Duck Hoon lee Younghoon Kim Jin Young Park Hyung Ryul You Taiho Park Minjun Kim Jongmin Choi Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)77 Cheongam-RoNam-GuPohang Gyeongbuk 37673Korea Department of Chemical and Environmental Engineering Yale UniversityNew Haven CT 06511USA Department of Energy Science and Engineering Daegu Gyeongbuk Institute of Science and Technology(DGIST)Daegu 42988Korea Department of Chemistry Kookmin UniversitySeoul 02707Korea RIKEN Center for Emergent Matter Science(CEMS) 2-1 HirosawaWako Saitama 351-0198Japan

For efficient colloidal quantum dot(CQD)solar cells(CQD-SCs),thiol-passivated p-type CQDs are generally used as a hole-transporting material(HTM);however,there are issues with the control of optoelectrical properties,low thiol passivation rate,and poor morphology with a power conversion efficiency(PCE)of approximately 11%.Although polymeric HTMs have been introduced to address these issues,maximizing efficiency and achieving green-solvent processability and thermal stability for commercialization is ***,we synthesize a novel benzodifuran(BDF)-based HTM(asy-ranPBTBDF)showing an electron-deficient state,low steric hindrance,and low planarity compared to those of a typical benzodithiophene(BDT)-based HTM(asy-ranPBTBDT).BDF properties lead to deep high occupied molecular orbital(HOMO)levels,closeπ-πstacking,excellent solubility,and amorphous properties related to efficiency,green-solvent processability,and thermal *** these benefits,the asy-ranPBTBDF-based CQD-SC showed enhanced open-circuit voltage(Voc)(0.65 V)and PCE(13.29%)compared to those of the asy-ranPBTBDT-based device(0.63 V and 12.22%)in toxic processes with *** asy-ranPBTBDF-based CQD-SC showed a PCE of 12.51%in a green-solvent process with 2-methylanisole and improved thermal stability at 80℃(83.8%retaining after 24 h)owing to less lateral crystallization than the asy-ranPBTBDT-based device(60.8%retaining after 24 h).

关键词： colloidal quantum dot green-solvent photovoltaics semiconducting polymers stability

High-index-contrast photonic structures:a versatile platform for photon manipulation

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Light(Science & Applications) 2022年第11期11卷 2617-2632页

作者： Young-Bin Kim Jin-woo Cho Yun-Jo lee Dukkyu Bae Sun-Kyung Kim Department of Applied Physics Kyung Hee UniversityYonginGyeonggido 17104Republic of Korea Hexa Solution Co. LtdSuwonGyeonggi-do 16229Republic of Korea

In optics,the refractive index of a material and its spatial distribution determine the characteristics of light ***,exploring both low-and high-index materials/structures is an important consideration in this *** cavities,which are defined as low-index bases,exhibit a variety of unusual or even unexplored optical characteristics and are used in numerous functionalities including diffraction gratings,localised optical antennas and low-loss *** this report,we discuss the fabrication of hollow cavities of various sizes(O.2-5μm in diameter)that are supported by conformal dielectric/metal shells,as well as their specific applications in the ultraviolet(photodetectors),visible(light-emitting diodes,solar cells and metalenses),near-infrared(thermophotovoltaics)and mid-infrared(radiative coolers)*** findings demonstrate that hollow cavities tailored to specific spectra and applications can serve as versatile optical platforms to address the limitations of current optoelectronic ***,hollow cavity embedded structures are highly elastic and can minimise the thermal stress caused by high *** such,future applications will likely include high-temperature devices such as thermophotovoltaics and concentrator photovoltaics.

关键词： versatile index ultraviolet

New strategy for reversal tolerant anode for automotive polymer electrolyte fuel cell

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Chinese Chemical Letters 2019年第6期30卷 1186-1189页

作者： Chanho Pak Seung woo lee Chaekyung Baik Bong Ho lee Dae Jong You Eunyoung You Graduate Program of Energy Technology School of Integrated Technology Institute of Integrated Technology Gwangju Institute of Science and Technology Gwangju 61005 Republic of Korea Fuel Cell Engineering Core Technology Team Division of Electric Powertrain Hyundai Mobis Co. Ltd. Yongin Gyeonggi-do 16891 Republic of Korea

Since the commercialization of the fuel cell electric vehicles (FCEVs), the polymer electrolyte membrane fuel cell system has been actively improved as a powertrain for ultimate environment-friendly vehicle. During the FCEV operation, various transient conditions such as start-up/shut-down and fuel starvation occur irregularly, which deteriorates the durability of the membrane electrode assembly. In particular, when fuel starvation occurs, the carbon support in the anode is oxidized within few minutes, thus the mitigation of this phenomenon is essential for securing the durability. This short review introduces the concept of reversal tolerant anode (RTA), which is a mitigation method using an oxygen evolution catalyst and reviews some previous reports. In addition, new approach for RTA suggested by authors recently, which is the replacement of Pt anode catalyst by multifunctional IrRu alloy catalyst that simultaneously exhibits the activities for the hydrogen oxidation reaction and the oxygen evolution reaction is introduced.

关键词： Multifunctional IrRu alloy catalyst Reversal tolerant anode Hydrogen oxidation reaction catalyst Oxygen evolution reaction catalyst Cell reversal durability Polymer electrolyte membrane fuel cell

Hepatic angiosarcoma manifested as recurrent hemoperitoneum

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World Journal of Gastroenterology 2008年第18期14卷 2935-2938页

作者： Seung-woo lee Chun-Young Song Young-Hwa Gi Sang-Beom Kang Yon-Soo Kim Soon-woo Nam Dong-Soo lee Jong-Ok Kim Division of Gasroenterology and Hepatology Departments of Internal Medicine The Catholic University of Korea College of Medicine Seoul 301-723 Korea Department of pathology The Catholic University of Korea College of Medicine Seoul 301-723 Korea

Angiosarcoma is a rare tumor that account for less than 1% of all sarcomas. Although hepatic angiosarcoma usually presents with unspecific symptoms, it rapidly progresses and has a high mortality. We report a rare cas... 详细信息

关键词： Angiosarcoma Hemoperitoneum Primary hepatic tumor

Human neural stem cells promote proliferation of endogenous neural stem cells and enhance angiogenesis in ischemic rat brain

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Neural Regeneration Research 2016年第2期11卷 298-304页

作者： Sun Ryu Seung-Hoon lee Seung U.Kim Byung-woo Yoon Department of Neurology and Clinical Research Institute Seoul National University Hospital Seoul National University Medical Research Center Seoul National University Medical Research Institute Chung-Ang University School of Medicine Department of Neurology UBC Hospital University of British Columbia

Transplantation of human neural stem cells into the dentate gyrus or ventricle of rodents has been reportedly to enhance neurogenesis. In this study, we examined endogenous stem cell proliferation and angiogenesis in the ischemic rat brain after the transplantation of human neural stem cells. Focal cerebral ischemia in the rat brain was induced by middle cerebral artery occlusion. Human neural stem cells were transplanted into the subventricular zone. The behavioral performance of human neural stem cells-treated ischemic rats was significantly improved and cerebral infarct volumes were reduced compared to those in untreated animals. Numerous transplanted human neural stem cells were alive and preferentially localized to the ipsilateral ischemic hemisphere. Furthermore, 5-bromo-2′-deoxyuridine-labeled endogenous neural stem cells were observed in the subventricular zone and hippocampus, where they differentiated into cells immunoreactive for the neural markers doublecortin, neuronal nuclear antigen Neu N, and astrocyte marker glial fibrillary acidic protein in human neural stem cells-treated rats, but not in the untreated ischemic animals. The number of 5-bromo-2′-deoxyuridine-positive ？ anti-von Willebrand factor-positive proliferating endothelial cells was higher in the ischemic boundary zone of human neural stem cells-treated rats than in controls. Finally, transplantation of human neural stem cells in the brains of rats with focal cerebral ischemia promoted the proliferation of endogenous neural stem cells and their differentiation into mature neural-like cells, and enhanced angiogenesis. This study provides valuable insights into the effect of human neural stem cell transplantation on focal cerebral ischemia, which can be applied to the development of an effective therapy for stroke.

关键词： nerve regeneration focal cerebral ischemia middle cerebral artery occlusion human neural stem cells transplantation differentiation infarct size behavioral analysis endogenous neurogenesis angiogenesis rats neural regeneration

Covalent organic frameworks:Design and applications in electrochemical energy storage devices

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InfoMat 2022年第6期4卷 1-35页

作者： Shikai Jin Omar Allam Seung Soon Jang Seung woo lee George W.woodruff School of Mechanical Engineering Georgia Institute of TechnologyAtlantaGeorgiaUSA Computational NanoBio Technology Laboratory School of Material Science and EngineeringGeorgia Institute of TechnologyAtlantaGeorgiaUSA

As an emerging class of crystalline organic material,covalent organic frameworks(COFs)possess uniform porosity,versatile functionality,and precise control over designated *** from the favorable charge and mass transport pathways offered by the porous framework,COFs can also exhibit designed reversible redox *** the past few years,their potential has attracted a great deal of attention for charge storage and transport applications in various electrochemical energy storage devices,and numerous design strategies have been proposed to enhance the corresponding electrochemical *** review summarizes the working principle and synthesis methods of COFs and discusses significant findings for supercapacitors and various rechargeable battery systems,emphasizing the representative design strategies and their underlying relationship with electrochemical *** addition,key advances achieved by computations are highlighted along with the challenges and prospects in this field.

关键词： covalent organic frameworks rechargeable batteries redox-active electrodes solid electrolyte supercapacitors

ABA Signaling in Guard Cells Entails a Dynamic Protein-Protein Interaction Relay from the PYL-RCAR Family Receptors to Ion Channels

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Molecular Plant 2013年第2期6卷 528-538页

作者： Sung Chul lee Chae woo Lim Wenzhi Lan Kai He Sheng Luan Department of Plant and Microbial Biology University of California Berkeley CA 94720 USA School of Biological Sciences (BK21 Program) Chung-Ang University Seoul 156-756 Korea Plant Molecular Biology Institute and College of Life Sciences Nanjing University China WCU Program Chonnam National University Gwangju Korea

Plant hormone abscisic acid （ABA） serves as an integrator of environmental stresses such as drought to trig-ger stomatal closure by regulating specific ion channels in guard cells. We previously reported that SLAC1, an outward anion channel required for stomatal closure, was regulated via reversible protein phosphorylation events involving ABA signaling components, including protein phosphatase 2C members and a SnRK2-type kinase （OST1）. In this study, we reconstituted the ABA signaling pathway as a protein-protein interaction relay from the PYL/RCAR-type receptors, to the PP2C-SnRK2 phosphatase-kinase pairs, to the ion channel SLAC1. The ABA receptors interacted with and inhibited PP2C phosphatase activity against the SnRK2-type kinase, releasing active SnRK2 kinase to phosphorylate, and activate the SLAC1 channel, leading to reduced guard cell turgor and stomatal closure. Both yeast two-hybrid and bimolecular fluorescence complementation assays were used to verify the interactions among the components in the pathway. These biochemical assays demonstrated activity modifications of phosphatases and kinases by their interaction partners. The SLAC1 channel activity was used as an endpoint readout for the strength of the signaling pathway, depending on the presence of different combinations of signaling components. Further study using transgenic plants overexpressing one of the ABA receptors demonstrated that changing the relative level of interacting partners would change ABA sensitivity.

关键词： abscisic acid ABA receptor protein kinase protein phosphatase SLAC1.