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Fabrication of SiC_p/AA5083 composite via friction stir welding

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中国有色金属学会会刊：英文版 2012年第S3期22卷 634-638页

作者： byung-Wook ahn Don-Hyun CHOI Yong-Hwan KIM Seung-Boo JUNG School of Advanced Materials Science and Engineering Sungkyunkwan University

Microstructure and mechanical properties of SiCp /AA5083 composite fabricated by friction stir welding (FSW) were *** influence of the number of FSW passes on the distribution of SiC particles and mechanical properties in the joint was *** one pass,the SiC particles were entangled in the upper side of the stir zone (SZ).However,the particle distribution became more uniform after two passes due to the repeated stirring of the *** the SiC particles facilitate the grain refinement in the SZ by the pinning effect,the particle including region has much smaller grain size than the SZ without SiC *** SiCp /AA5083 composite region exhibits a Vickers hardness of HV90,which is much higher than the value of HV80 in the SZ produced by FSW without SiC particles.

关键词： metal matrix composite SiC particle friction stir welding mechanical property

Researches for higher electrical conductivity copper-based materials

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cMat 2024年第1期1卷 92-107页

作者： Wen-Jing Zhang Lue Huang Xu-Jun Mi Hao-Feng Xie Xue Feng Jee Hyuk ahn State Key Laboratory of Nonferrous Metals and Processes GRINM Group Co.Ltd.BeijingChina GRIMAT Engineering Institute Co. Ltd.BeijingChina General Research Institute for Nonferrous Metals BeijingChina School of Materials Science and Engineering South China University of TechnologyGuangzhouChina Extreme Materials Institute Korea Institute of Materials and ScienceChangwonKorea

Copper and copper-based materials are widely used in power electronics,auto-mobiles,mechanical manufacturing and high-tech manufacturing fields such as aerospace,telecommunications and integrated circuits owing to their compre-hensive advantages in mechanical,electrical conductivity and processing *** the rapid development of technology,many emerging technical fields have introduced more challenging requirements for the electrical conductivity of *** article reviews the research status of high-conductivity copper-based materials and introduces three methods to improve electrical conductivity,including purification,alloying and addition of nanocarbon *** sum-marise the advantages,disadvantages and future development trends of methods for improving copper *** key to producing high-conductivity copper-based materials is development of low-cost,continuous and stable processes.

关键词： copper matrix composite high-strength and high-electrical-conductivity copper alloy higher electrical conductivity pure copper material

Effect of Post-Rolling after ECAP on Superplastic Behavior of Commercial Al-Mg Alloy

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Journal of Rare Earths 2004年第Z2期22卷 53-56页

作者： Dong Hyuk Shin byung Du ahn Hyun Soo Woo Kyeom Kim Kyung-Tae Park Department of Metallurgy and Materials Science Hanyang UniversityAnsan 425-791Korea Department of Metallurgy and Materials ScienceHanyang UniversityAnsan 425-791Korea Department of Metallurgy and Materials ScienceHanyang UniversityAnsan 425-791Korea Department of Metallurgy and Materials ScienceHanyang UniversityAnsan 425-791Korea Division of Advanced Materials Science & EngineeringHanbat National UniversityTaejon 305-719Korea

A commercial Al-Mg alloy was subjected to equal channel angular pressing of 4 passes with and without postrolling, and the effects of post-rolling on the deformation characteristics of the alloy at 723 K were examined. Post-rolling was found to influence the deformation behavior significantly. The deformation behavior of the alloy processed only by equal channel angular pressing was characterized by (a) localized deformation indicated by severe surface prominence and depression, (b) the strain rate sensitivity of 0.33, and (c) moderate high strain rate superplastic elongations. By contrast, that of the alloy processed by equal channel angular pressing and post-rolling (70 % thickness reduction) was manifested by (a) uniform deformation associated with grain boundary sliding throughout the sample, (b) a sigmoidal behavior showing the strain rate sensitivity of 0.45 at the intermediate strain rates in the logarithmic stress-strain rate curve, and (c) very large high strain rate superplastic elongations.

关键词： high superplasticity equal channel angular pressing rolling deformation mechanisms rare earths

A pilot clinical study to evaluate feasibility of using single patient classifier as a prognostic test in stage Ⅱ-Ⅲ gastric cancer patients

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Chinese Journal of Cancer Research 2024年第4期36卷 368-377页

作者： Ji Yeong An Sung Eun Oh Soomin ahn Hyoung-II Kim Yoo Min Kim Minah Cho Keun Won Ryu Hong Man Yoon Young Kyu Park In Gyu Kwon Sung Hoon Noh Kyung Hee Lee In Cho Myoung Won Son Jong Won Kim Young-Woo Kim Department of Surgery Samsung Medical CenterSungkyunkwan University School of MedicineSeoul 06351Republic of Korea Department of Pathology and Translational Genomics Samsung Medical CenterSungkyunkwan University School of MedicineSeoul 06351Republic of Korea Department of Surgery Yonsei University College of MedicineSeoul 03722Republic of Korea Gastric Cancer Center Yonsei Cancer CenterYonsei University Health SystemSeoul 03722Republic of Korea Center for Gastric Cancer National Cancer CenterGoyang 10408Republic of Korea Department of Surgery Chonnam National University Hwasun HospitalChonnam National University College of MedicineGwangju 58128Republic of Korea Department of Surgery Gangnam Severance HospitalYonsei University College of MedicineSeoul 06273Republic of Korea Department of Hematology-Oncology Yeungnam University Medical CenterDaegu 42415Republic of Korea Department of Surgery Soonchunhyang University College of MedicineBucheon 14584Republic of Korea Department of Surgery Soonchunhyang University Cheonan HospitalSoonchunhyang University College of MedicineCheonan 31151Republic of Korea Department of Surgery Chung-Ang University HospitalChung-Ang University College of MedicineSeoul 06973Republic of Korea

Objective:Precision medicine approaches emphasize the importance of reliable prognostic tools for guiding individualized therapy *** this study,we evaluated the clinical feasibility of the single patient classifier(SPC)test,a new clinical-grade prognostic assay,in stageⅡ-Ⅲgastric cancer ***:A prospective multicenter study was conducted,involving 237 patients who underwent gastrectomy between September 2019 and August 2020 across nine *** SPC test was employed to stratify patients into risk groups,and its feasibility and performance were *** primary endpoint was the proportion of the cases in which the test results were timely delivered before selecting postoperative ***,3-year disease-free survivals of risk groups were ***:The SPC test met the primary endpoint *** 99.5%of SPC tests were timely delivered to hospitals before the postoperative treatment *** a clinical setting,the median time from the specimen transfer to laboratory to the result delivery to hospital was 4 ***,3-year disease-free survivals were significantly different between risk groups classified with SPC ***:This study highlights the SPC test's feasibility in offering crucial information timely delivered for making informed decisions regarding postoperative treatment *** also provides evidence to support the implementation of a future prospective clinical trial aimed at evaluating the clinical utility of the SPC test in guiding personalized treatment decisions for gastric cancer patients.

关键词： Prognostic test advanced gastric cancer adjuvant chemotherapy feasibility gastrectomy

Antistatic coating material consisting of poly (butylacrylate-co-styrene) core-nickel shell particle

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中国有色金属学会会刊：英文版 2009年第B9期19卷 119-123页

作者： Min-Yeong JEONG byung-Yoon ahn Sang-Koul LEE Won-Ki LEE Nam-Ju JO Department of Polymer Science and Engineering Pusan National University Kumho Petrochemical Samsung Corning Precision Glass Division of Chemical Engineering Pukyong National University

A transparent and antistatic coating material consisting of polymer core-metal shell particle was prepared. As a polymer core, poly(butylacrylate-co-styrene)s ([P(BA-co-sty)s]) with various compositions of butylacrylate and styrene were synthesized by emulsion polymerization. And the effect of comonomer composition on the thermal property of polymer core particle was investigated. By electroless plating method, the nickel particles were formed and deposited on the surface of P(BA-co-Sty) particles to form P(BA-co-Sty) core-nickel shell composite particles. SEM observation confirms that the nickel particles with size of 15 nm are distributed on the surface of the polymer core particles. The surface resistance of P(BA-co-Sty) core-nickel shell composite is 0.8×108Ω/cm2, enough to act as antistatic coating material.

关键词：复合粒子涂层材料单体组成抗静电苯乙烯丁酯聚合物颗粒镍

Regression of gastric endoscopic submucosal dissection induced polypoid nodular scar after Helicobacter pylori eradication:A case report

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World Journal of Clinical Cases 2022年第34期10卷 12793-12798页

作者： byung Chul Jin Ae Ri ahn Seong-Hun Kim Seung Young Seo Department of Internal Medicine Jeonbuk National University Medical SchoolResearch Institute of Clinical Medicine of Jeonbuk National University-Biomedical Research Institute of Jeonbuk National University HospitalJeonju 54907South Korea Department of Pathology Jeonbuk National University Medical SchoolResearch Institute of Clinical Medicine of Jeonbuk National UniversityBiomedical Research Institute of Jeonbuk National University Hospitaland Research Institute for Endocrine SciencesJeonju 56445South Korea

BACKGROUND Endoscopic submucosal dissection(ESD)is the treatment of choice for early gastric cancer and premalignant gastric *** some cases,ESD induced ulcer heals as a polypoid nodular scar(PNS).These scars may make the physicians raise several clinical implications such as post-ESD neoplastic *** SUMMARY We described a case of gastric ESD induced PNS which is regressed after Helicobacter pylori(***)eradication.A 58-year-old male patient was referred to the outpatient clinic for evaluation and treatment of gastric low-grade dysplasia(LGD).ESD was performed.A PNS was developed at the ESD *** endoscopic biopsy was done and there was no histological evidence of remnant tumor or recurrence but a hyperplastic mucosal *** PNS showed increase in size in follow-up endoscopy,and the biopsy specimen demonstrated *** *** eradication was done and the PNS was *** *** eradication is considerable for the regression of PNS if *** infesta tion is confirmed.

关键词： Polypoid nodular scar Helicobacter pylori Endoscopic submucosal dissection Case report

Perforated duodenal ulcer presenting with massive hematochezia in a 30-month-old child

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World Journal of Gastroenterology 2009年第38期15卷 4853-4855页

作者： Na Mi Lee Sin Weon Yun Soo ahn Chae Byoung Hoon Yoo Seong Jae Cha byung Kook Kwak Department of Pediatrics College of MedicineChung-Ang University Department of General Surgery College of MedicineChung-Ang University Department of Radiology College of MedicineChung-Ang University

Peptic ulcer disease is uncommon in children and rarely suspected as a cause of abdominal complaints in this age group; the diagnosis is therefore made almost exclusively when complications develop. Peptic ulcer disease is usually not considered in the differential diagnosis of pediatric patients. We present the case of a 30-month-old boy with duodenal perforation due to a peptic ulcer without a known etiology. The patient was admitted through the emergency department due to severe hematochezia and ongoing anemia; he presented with neither abdominal pain nor abdominal distension. There were no medical problems, and no drugs, such as corticosteroids or nonsteroidal anti-inflammatory drugs, had been prescribed or administered recently. We tried to control the active bleeding by medical treatment including arterial embolization, but the active bleeding was not controlled. Finally, an exploratory laparotomy was performed. A discrete anterior perforation with active bleeding of the duodenal wall was found. After the operation, there were no complications and the patient recovered fully.

关键词： Duodenal ulcer Peptic ulcer perforation Children Hematochezia Hemorrhage

Effects of Scutellaria baicalensis on neurogenesis in the hippocampal dentate gyrus and on spatial memory of adult rats

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Neural Regeneration Research 2011年第27期6卷 2085-2093页

作者： Sun-Hwa Lee byung-soo ahn Bong-soo Lim Seong-Kyu Kim Sam-Ki Kim Dae-Il Lee Sung-Rae Cho Deok-Gon Kim Jae-Bok Han byung-Il Min Department of East-West Medicine Graduate SchoolKyunghee University Department & Research Institute of Rehabilitation Medicine Yonsei University Department of Oriental Pediatrics Kyunghee Medical CenterKyunghee University Department of Physiology College of MedicineKyunghee University

We investigated the effects of ethanol extracted Scutellaria baicalensis（EESB） on spatial memory function and neurogenesis in the hippocampal dentate *** Sprague-Dawley rats were orally administered 50,100,or 200 mg/kg of EESB for 6 successive *** radial-arm maze test showed that 200 mg/kg of EESB improved the spatial memory of adult *** microscopy results showed that 100 mg/kg of EESB increased the number of bromodeoxyuridine（BrdU）-and neuron-specific nuclear protein-positive cells in the granular cell layer,and that 100 and 200 mg/kg of EESB increased the number of BrdU-/neuron-specific nuclear protein-positive cells in the sub-granular zone.200 mg/kg of EESB increased the number of BrdU-/glial fibrillary acid protein-positive cells in the subgranular *** findings indicate that EESB can effectively promote neurogenesis in the hippocampal dentate gyrus and improve spatial memory function.

关键词： Scutellaria baicalensis neurogenesis dentate gyrus hippocampus bromodeoxyuridine neuron-specific nuclear protein glial fibrillary acidic protein neural regeneration

Effect of electrolyte on mechanical properties of AZ31B Mg alloy in electrolytic plasma processing

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Transactions of Nonferrous Metals Society of China 2014年第S1期24卷 125-128页

作者： byung Hyun ahn Jung Il SONG Bon Heun KOO School of Nano & Advace material engineering Changwon National University Department of Mechanical Engineering Changwon National University

Coatings on Mg alloys were prepared using NaOH + Na2SiO3 as basic electrolyte containing electrolyte of Na2SiF6 or NaF. EPP treatment was carried out on AZ31 Mg alloys matrix under a hybrid voltage of AC of 200 V combined with DC of 260 V for 30 min. Structural and morphological analyses of ceramic coatings were analyzed by XRD and SEM. Wear and hardness of coatings were measured by pin-on disk test and Vickers hardness test. The coatings formed in Na2SiF6 and NaF electrolytes were mainly composed of MgO and Mg2SiO4. The measured micro-hardness of coating formed in Na2SiF6 electrolyte was found to be over HV 1100, while, coating formed in NaF electrolyte possessed micro-hardness of HV ~900. These results show that the mechanical properties of AZ31 B Mg alloys can be enhanced by the proper selection of electrolyte agent.

关键词： AZ31B Mg alloy surface treatment electrolytic plasma processing