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Effects of TiN film coating on electrochemical behaviors of nanotube formed Ti-xHf alloys

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中国有色金属学会会刊：英文版 2009年第4期19卷 857-861页

作者： Kang LEE won-gi kim Joo-Young CHO Sang-won EUN Han-Cheol CHOE Department of Dental Materials & Research Center of Nano-Interface Activation for Biomaterials College of DentistryChosun University Department of Applied Advanced Materials Korea Polytechnic Ⅴ Colleges

Ti-xHf(x=10%,20%,30% and 40%,mass fraction) alloys were prepared by arc melting,and the microstructure was controlled for 24 h at 1 000 ℃ in argon *** formation of nanotube was conducted by anodizing on Ti-Hf alloys in 1.0 mol/L H3PO4 electrolytes with small amounts of NaF at room *** then TiN coatings were coated by DC-sputtering on the anodized *** and nanotube morphology of the alloys were examined by field emission scanning electron microscopy(FE-SEM) and X-ray diffractometry(XRD).The corrosion properties of the specimens were examined through potentiodynamic test(potential range from -1 500 to 2 000 mV) in 0.9 % NaCl solution by *** microstructure shows the acicular phase and α' phase with Hf *** amorphous oxide surface is transformed to crystalline anatase *** coated nanotube surface has a good corrosion resistance.

关键词：氮化钛涂层合金制备纳米管电化学行为薄膜包衣 0.9%NaCl溶液扫描电子显微镜微观结构

Surface characteristics of HA coated Ti-Hf binary alloys after nanotube formation

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中国有色金属学会会刊：英文版 2009年第4期19卷 852-856页

作者： Yong-Hoon JEONG won-gi kim Geun-Hyeong PARK Han-Cheol CHOE Yeong-Mu KO Department of Dental Materials & Research Center of Nano-Interface Activation for Biomaterials College of DentistryChosun University Research Center for Oral Disease Regulation of the Aged College of DentistryChosun University

Ti-Hf binary alloys contained 10%,20%,30% and 40%(mass fraction)Hf were manufactured in the vacuum furnace *** then,specimens were homogenized for 24 h at 1 000 ℃ in argon *** formation of oxide nanotubes was conducted by anodic oxidation on the Ti-Hf alloy in 1 mol/L H3PO4 electrolytes containing small amounts of NaF at room *** hydroxyapatite(HA) coating made of tooth ash prepared by electron-beam physical vapor deposition(EB-PVD) *** corrosion behaviors of the specimens were examined through potentiodynamic test in 0.9% NaCl solution by *** microstructures of the alloys were examined by field emission scanning electron microscopy(FE-SEM) and x-ray diffractometer(XRD).It was observed that the lamellar structure translated to needle-like structure with Hf *** formed and HA coated Ti-xHf alloys had a good corrosion resistance.

关键词：二元合金 HA涂层纳米管表面特性管形 0.9%NaCl溶液物理气相沉积铪

Variation in dynamic deformation behavior and resultant yield asymmetry of AZ80 alloy with extrusion temperature

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Journal of Materials Science & Technology 2020年第11期42卷 225-236页

作者： Sang-Hoon kim Sang won Lee Byoung gi Moon Ha Sik kim Sung Hyuk Park School of Materials Science and Engineering Kyungpook National UniversityDaegu702701South Korea Implementation Research Division Korea Institute of Materials ScienceChangwon51508South Korea

In this work,variation in the dynamic recrystallization(DRX)and dynamic precipitation behavior of AZ80 alloy during extrusion due to changes in extrusion temperature was investigated,and the resultant microstructure and yield asymmetry were *** the extrusion temperature increases from 250℃to 350℃,the primary DRX mechanism changes from twin-induced DRX to discontinuous DRX,resulting in an increase in the DRX area fraction and un DRXed grain *** addition,as the extrusion temperature rises,Mg17Al12 precipitation during extrusion decreases sharply throughout the extruded *** reduction in the compressive yield strength(CYS)with increasing extrusion temperature is more pronounced than it is for the tensile yield strength(TYS),which ultimately increases the yield asymmetry of the extruded *** higher extrusion temperature has less of an influence on the TYS due to the promotion of certain hardening *** the other hand,the greater reduction in the CYS is attributed to the increased fraction and size of regions in which{1012}twins predominantly form and the lower amount of precipitates,which effectively facilitates{1012}twinning.

关键词： Magnesium alloys Extrusion Recrystallization Precipitation Yield asymmetry

Cholecystocolic fistula caused by gallbladder carcinoma:Preoperatively misdiagnosed as hepatic colon carcinoma

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World Journal of Gastroenterology 2015年第15期21卷 4765-4769页

作者： gi won Ha Min Ro Lee Jong Hun kim Research Institute of Clinical Medicine Chonbuk National University Medical School

Cholecystocolic fistula secondary to gallbladder carcinoma is extremely rare and has been reported in very few studies. Most cholecystocolic fistulae are late complications of gallstone disease, but can also develop following carcinoma of the gallbladder when the necrotic tumor penetrates into the adjacent colon. Although no currently available imaging technique has shown great accuracy in recognizing cholecystocolic fistula, abdominopelvic computed tomography may show fistulous communication and anatomical *** we report an unusual case of cholecystocolic fistula caused by gallbladder carcinoma, which was preoperatively misdiagnosed as hepatic flexure colon carcinoma.

关键词： Cholecystocolic fistula Gallbladder carcinoma Misdiagnosed Hepatic colon carcinoma Abdominopelviccomputed tomography

A new hemostatic clip for endoscopic surgery that can maintain blood flow after clipping

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World Journal of Gastroenterology 2014年第5期20卷 1325-1331页

作者： Kyoung won Nam Sang Bong Lee In Young kim Kwang gi kim Sang Jae Park Department of Biomedical Engineering Hanyang University Biomedical Engineering Branch National Cancer Center Center for Liver Cancer National Cancer Center

AIM: To develop a new hemostatic device for endoscopic surgery that can control the bleeding without completely occluding the bleeding vessel.

关键词： Vessel bleeding Hemostasis Hemostatic clip Laparoscopic surgery Endoscopic surgery

Synthesis of Al-doped ZnO Nanorods via Microemulsion Method and Their Application as a CO Gas Sensor

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Journal of Materials Science & Technology 2015年第6期31卷 639-644页

作者： Sang Kyoo Lim Seong Hui Hong Sung-Ho Hwang won Mi Choi Soonhyun kim Hyunwoong Park Min gi Jeong Division of Nano & Bio Technology Daegu Gyeongbuk Institute of Science and Technology(DGIST) School of Energy Engineering Kyungpook National University Department of Advanced Organic Materials Engineering Yeungnam University

Aluminum doped ZnO(AZO) nanorods were synthesized by microemulsion method with different types of *** phase and the morphology of the above nanorods were investigated by scanning electron microscopy(SEM) and X-ray diffraction(XRD).SEM observations showed that the ZnO nanorods had diameters around about 50—200 nm and lengths up to several *** CO gas sensing properties of the AZO nanorods were tested at operating temperatures of 200,300,350 and 400 ℃.It was found that AZO nanorods based sensor exhibited the highest sensitivity to CO at 350℃.

关键词： Zinc oxide Nanorod Microemulsion Aluminum CO and g

Creep and tensile properties of press molding joined GMT-sheets

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Transactions of Nonferrous Metals Society of China 2011年第A1期21卷 170-174页

作者： Jin-Woo kim Dong-gi LEE Center for NDE Iowa State University Department of Mechatronics Engineering Chosun University

GMT-sheet is used in automobile bumper with high rigidity and strength, and its joining strength is influenced by lap length, one of the joined molding conditions. Fracture strength was calculated by dividing fracture load with cross-sectional area. Total five repeated measurements were made to obtain the average value. Tensile test was conducted at room temperature for 10 specimens. In addition, the effect of compression ratio on creep and tensile performance during lap joined molding was discussed. With increasing lap length, the lap joining efficiency of GMT-sheet was increased. However, higher compression ratio reduced the joining efficiency. Creep test on GMT-sheet showed abrupt fracture without tertiary creep. This can be explained by the weak thermal resistance of the resin. If GMT-sheet was exposed to high temperature for a long time, it was easily failed by external force.

关键词： GMT-sheet randomly oriented composite unidirectional oriented composite compression ratio lap joint

Recovery of brachial plexus injury after bronchopleural fistula closure surgery based on electrodiagnostic study:A case report and review of literature

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World Journal of Clinical Cases 2022年第30期10卷 11090-11100页

作者： Young-In Go Da-Sol kim gi-Wook kim Yu Hui won Sung-Hee Park Myoung-Hwan Ko Jeong-Hwan Seo Department of Physical Medicine&Rehabilitation Jeonbuk National University Medical SchoolJeonju 54907South Korea Research Institute of Clinical Medicine of Jeonbuk National University Biomedical Research Institute of Jeonbuk National University HospitalJeonju 54907South Korea

BACKGROUND Axillary thoracotomy and muscle flap are muscle-and nerve-sparing methods among the surgical approaches to bronchopleural fistula(BPF).However,in patients who are vulnerable to a nerve compression injury,nerve injury may *** this report,we present a unique case in which the brachial plexus(division level),suprascapular,and long thoracic nerve injury occurred after BPF closure surgery in a patient with ankylosing spondylitis and concomitant multiple joint *** SUMMARY A 52-year-old man with a history of ankylosing spondylitis with shoulder joint contractures presented with right arm weakness and sensory impairment immediately after axillary thoracotomy and latissimus dorsi muscle flap surgery for BPF *** the surgery,the patient was positioned in a lateral decubitus position with the right arm hyper-abducted for approximately 6 *** resonance imaging and ultrasound revealed subclavius muscle injury or myositis with brachial plexus(BP)compression and related *** electrodiagnostic study confirmed the presence of BP injury involving the wholedivision level,long thoracic,and suprascapular nerve *** was treated with medication,physical therapy,and ultrasound-guided *** steroid injection at the BP,hydrodissection with 5%dextrose water at the BP and suprascapular nerve,and intra-articular steroid and hyaluronidase injection at the glenohumeral joint were *** postoperative day 194,the pain and arm weakness were resolved,and a follow-up electrodiagnostic study showed marked *** Clinicians should consider the possibilities of multiple nerve injuries in patients with joint contracture,and treat each specific therapeutic target.

关键词： Brachial plexus Electrodiagnosis Physical therapy Surgical flaps Thoracotomy Case report

Synthesis and Gas Sensing of TiO_2 Ultrafine Powders by Precipitating

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稀有金属材料与工程 2006年第A3期35卷 163-164页

作者： Min-Hyun Seo Bong-Ho Lee Jong-won kim gi-Hong Rue Duk-Dong Lee Jeung-Soo Huh Department of Sensor and Display Engineering Kyungpook National UniversitySangyuk-DongBukguDaegu 1370Korea Department of Materials Science and Metallurgy Kyungpook National UniversitySangyuk-DongBukguDaegu 1370Korea Department of Nano-science and Technology Kyungpook National UniversitySangyuk-DongBukguDaegu 1370Korea School of Electronic Engineering Kyungpook National UniversitySangyuk-DongBukguDaegu 1370Korea Department of Sensor and Display Engineering Kyungpook National UniversitySangyuk-DongBukguDaegu 1370Korea.Department of Nano-science and TechnologyKyungpook National UniversitySangyuk-DongBukguDaegu 1370Korea

We investigated the gas sensing characteristics of rutile and anatase TiO_2 nano-particle sensors for chemical warfare ***_2 nano-powders with rutile and anatase structure were fabricated by controlling pH value without heat treatment *** mean particle size of TiO_2 powders were below 10 ***-prepared TiO_2 powders have several advantages of nano particle size and high surface area and could be a prominent candidate for ***_2 sensors were examined with DMMP for chemical warfare agents detection.

关键词： TiO2 chemical warfare agents sensor nano-sensor pH