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Dispersion of ultrafine SiC particles in molten Al-12Si alloy

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Transactions of Nonferrous Metals Society of China 2011年第A1期21卷 33-36页

作者： Jin-Ju PARK Sang-Hoon lee min-ku lee Chang-Kyu RHEE Nuclear Materials Research Division Korea Atomic Energy Research Institute Daejeon 305-353 Korea

The bulk A1-12 Si eutectic composites were fabricated through a conventional liquid metal casting route, especially with the help of ultrafine ceramic powders made by self-propagating high-temperature synthesis （SHS） process. The SHS powders were fabricated by the chemical reaction between micro-sized SiC and A1 particles at very high combustion temperatures, producing the coarse A1 particles （several tens of microns） containing ultrafine SiC ceramic particles. Microstructural observation revealed that the addition of ultrafine SiC particles has a crumbling tendency of Si eutectic phase. It is suggested that the casting method combined with SHS process is promising for fabricating the Al-based MMC with ultrafine ceramic particles.

关键词： AI-12Si alloy dispersion self-propagating high-temperature synthesis (SHS) ultrafine ceramic SiC

Fabrication of cast carbon steel with ultrafine TiC particles

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Transactions of Nonferrous Metals Society of China 2011年第A01期21卷 54-57页

作者： Sang-Hoon lee Jin-Ju PARK Sung-Mo HONG Byoung-Sun HAN min-ku lee Chang-Kyu RHEE Nuclear Materials Research Division Korea Atomic Energy Research Institute Daejeon 305-353 Korea

The carbon steels dispersed with ultrafine TiC particles were fabricated by conventional casting method. The casting process is more economical than other available routes for metal matrix composite production, and the large sized components to be fabricated in short processing time. However, it is extremely difficult to obtain uniform dispersion of ultrafine ceramic particles in liquid metals due to the poor wettability and the specific gravity difference between the ceramic particle and metal matrix. In order to solve these problems, the mechanical milling (MM) and surface-active processes were introduced. As a result, Cu coated ultrafine TiC powders made by MM process using high energy ball milling machine were mixed with Sn powders as a surfactant to get better wettability by lowering the surface tension of carbon steel melt. The microstructural investigations by OM show that ultrafine TiC particles are distributed uniformly in carbon steel matrix. The grain sizes of the cast matrix with ultrafine TiC particles are much smaller than those without ultrafine TiC particles. This is probably due to the fact that TiC particles act as nucleation sites during solidification. The wear resistance of cast carbon steel composites added with MMed TiC/Cu-Sn powders is improved due to grain size refinement.

关键词： TiC particles mechanical milling carbon steel casting dispersion wettability

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A01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)

RGB Color-Discriminable Photonic Synapse for Neuromorphic Vision System

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Nano-Micro Letters 2025年第4期17卷 39-62页

作者： Bum Ho Jeong Jaewon lee Miju ku Jongmin lee Dohyung Kim Seokhyun Ham Kyu-Tae lee Young-Beom Kim Hui Joon Park Department of Organic and Nano Engineering&Human-Tech Convergence Program Hanyang UniversitySeoul 04763Korea Department of Semiconductor Engineering Hanyang UniversitySeoul 04763Korea Department of Mechanical Engineering Hanyang UniversitySeoul 04763Korea Department of Physics Inha UniversityIncheon 22212Korea

To emulate the functionality of the human retina and achieve a neuromorphic visual system,the development of a photonic synapse capable of multispectral color discrimination is of paramount ***,attaining robust color discrimination across a wide intensity range,even irrespective of medium limitations in the channel layer,poses a significant ***,we propose an approach that can bestow the color-discriminating synaptic functionality upon a three-terminal transistor flash memory even with enhanced discriminating *** incorporating the strong induced dipole moment effect at the excitation,modulated by the wavelength of the incident light,into the floating gate,we achieve outstanding RGB color-discriminating synaptic functionality within a remarkable intensity range spanning from 0.05 to 40 mW cm^(-2).This approach is not restricted to a specific medium in the channel layer,thereby enhancing its *** effectiveness of this color-discriminating synaptic functionality is demonstrated through visual pre-processing of a photonic synapse array,involving the differentiation of RGB channels and the enhancement of image contrast with noise ***,a convolutional neural network can achieve an impressive inference accuracy of over 94%for Canadian-Institute-For-Advanced-Research-10 colorful image recognition task after the *** proposed approach offers a promising solution for achieving robust and versatile RGB color discrimination in photonic synapses,enabling significant advancements in artificial visual systems.

关键词： Organic field-effect transistor Photonic synapse Excited-state dipole moment RGB color discrimination Neuromorphic visual system

Clinical utility of glycated albumin and 1,5-anhydroglucitol in the screening and prediction of diabetes:A multi-center study

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World Journal of Diabetes 2025年第4期16卷 178-188页

作者： Kam-Ching ku Junda Zhong Erfei Song Carol Ho-Yi Fong Karen Siu-Ling Lam Aimin Xu Chi-Ho lee Chloe Yu-Yan Cheung Cheung Department of MedicineUniversity of Hong KongHong Kong 999077China State Key Laboratory of Pharmaceutical Biotechnology University of Hong KongHong Kong 999077China Guangdong-Hong Kong Joint Institute of Metabolic Medicine University of Hong KongHong Kong 999077China

BACKGROUND Despite being the gold standard,the use of glycated hemoglobin(HbA1c)and fasting plasma glucose(FPG)for diagnosing dysglycemia is *** particular,a low level of agreement between HbA1c and FPG in detecting prediabetes and diabetes has led to difficulties in clinical *** albumin(GA)and 1,5-anhydroglucitol(1,5-AG)may potentially serve as biomarkers for the detection and prediction of diabetes,as well as glycemic *** To explore the diagnostic performance of GA and 1,5-AG for screening dysglycemia;assess whether they can be used for glycemic monitoring in Chinese morbidly-obese patients;and examine their predictive ability for incident diabetes in a Chinese community-based *** GA and 1,5-AG concentrations were measured in 462 morbidly-obese patients from the Obese Chinese Cohort(OCC).A sub-group of diabetes subjects(n=24)was prospectively followed-up after bariatric *** between baseline and post-surgery biomarker values were converted to percentage change from baseline to assess the response to glycemic *** ability of the biomarkers was assessed in 132 incident diabetes cases and 132 matched non-diabetes controls in the community-based Cardiovascular Risk Factor Prevalence Study(CRISPS).A prediction model was developed and compared with clinical models based on conventional risk *** GA exhibited an excellent diagnostic value with an area under the receiver operating characteristic curve(AUC)of 0.919(95%CI:0.884-0.955)for identifying diabetes and a high agreement in the classification of diabetes with both FPG and HbA1c in the *** demonstrated the fastest response to glycemic *** CRISPS,the‘B3A’prediction model,which consisted of body mass index(BMI)and 3 biomarkers(HbA1c,GA and 1,5-AG),achieved a comparable predictive value[AUC(95%CI):0.793(0.744-0.843)]to that of a clinical model comprising BMI,HbA1c,FPG and 2-hour glucose(2hG)[AUC(95%CI):0.783(0.733-0.834)

关键词： Diabetes Biomarkers Prediction Glycated albumin 1,5-anhydroglucitol

Preparation of AChE Inhibitors From Jujubogenin

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Chinese Chemical Letters 2000年第8期11卷 671-674页

作者： Yu ZHAO Yuan Ling ku Shoei Sheng lee Laboratory of Phytochemistry Kunnming Institute of BotanyChinese Academy of SciencesKunming 650204 School of Pharmacy College of MedicineNational Taiwan UniversityTaipei 10018

A dammarane derivative dihydrojujubogenin-2-en-1-one, which possesses a skeleton and pharmacophore partially similar to those of Territrem B, a potent AChE inhibitor, was synthesized via three different paths. The ant... 详细信息

关键词： Alzheimer disease (AD) acetylcholinesterase AChE inhibitor pharmaceutical chemistry jujubogenin Territrem B analogues

Mimetic Preparation of Analogues of Territrem B, A Potent Acetylcholinesterase Inhibitor

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Chinese Chemical Letters 2000年第12期11卷 1045-1048页

作者： Yu ZHAO Yuan Ling ku Shoei Sheng lee Laboratory of Phytochemistry Kunming Institute of BotanyChinese Academy of SciencesKunming 650204 School of Pharmacy College of MedicineNational Taiwan UniversityTaipei 10018

A mimetic synthesis of a potent acetylcholinesterase inhibitor, Territrem B, was carried out from the naturally occurring jujubosides. The anti-AChE activity of the product, which possesses the 2-en-1-one pharmacophore and the aromatic ring, was measured. The aromatic ring moiety seemed to be less influencing when comparing with the 2-en-1-one moiety.

关键词： acetylcholinesterase inhibitor territrem B analogues jujubosides

Challenges for clinicians treating autoimmune pancreatitis:Current perspectives

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World Journal of Clinical Cases 2023年第1期11卷 30-46页

作者： Seong-Hun Kim Yun Chae lee Hyung ku Chon Division of Gastroenterology Department of Internal MedicineJeonbuk National University Medical SchoolJeonju 54907South Korea Department of Internal Medicine Institution of Wonkwang Medical ScienceWonkwang University School of Medicine and HospitalIksan 54538South Korea

Autoimmune pancreatitis(AIP)is a rare disease clinically characterized by obstructive jaundice,unintentional weight loss,acute pancreatitis,focal pancreatic mass,and *** is classified into two subtypes-type 1 and type 2-according to pathological findings,clinical features,and serology test results,but some cases may be defined as type not otherwise in the absence of pathological findings and inflammatory bowel *** address the differences in diagnostic criteria by country,standard diagnostic criteria for AIP were proposed in 2011 by an international consensus of expert *** diagnosis of AIP from pancreatic ductal adenocarcinoma is important but remains challenging for ***,all subtypes of AIP show dramatic response to steroid *** review discusses the current perspectives on the diagnosis and management of AIP in clinical practice.

关键词： Autoimmune pancreatitis Pancreatic cancer International consensus diagnostic criteria Steroid

Spontaneous aortic pseudoaneurysm rupture into the sigmoid colon in Behcet's disease patient

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World Journal of Gastroenterology 2015年第46期21卷 13201-13204页

作者： Su Lim lee Young Mi ku Yoodong Won Department of Radiology College of MedicineThe Catholic University of Korea

Beh?et's disease(BD) is a multisystem autoimmune disorder characterized by recurrent orogenital ulcers,uveitis,and skin lesions. The vascular manifestations include thrombophlebitis,stenosis,occlusion,and pseudoaneurysm. BD infrequently precipitates aortic pseudoaneurysm rupture into the sigmoid mesocolon and lumen of the adjacent colon. Here we report an extremely rare case of spontaneous abdominal aortic pseudoaneurysm rupture via the sigmoid mesocolon into the lumen of the sigmoid colon in a 37-year-old patient with BD.

关键词： Behcet's disease Aorta Pseudoaneurysm Lower gastrointestinal bleeding Multi-detector computed tomography