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Femtosecond laser-mediated anchoring of polymer layers on the surface of a biodegradable metal

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Journal of Magnesium and Alloys 2021年第4期9卷 1380-1388页

作者： Jaeho Park Bo-In Park young Ju Son Sun Hee Lee Seung-hoon Um Yu-Chan Kim Myoung-Ryul Ok jeong-Yun Sun Hyung-Seop Han Hojeong jeon Center for Biomaterials Korea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea Department of Materials science and Engineering Seoul National University(SNU)Seoul 08826Republic of Korea Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea Division of Bio-Medical Science and Technology KIST SchoolKorea University of Science and TechnologySeoul 02792Republic of Korea KU-KIST Graduate School of Converging Science and Technology Korea UniversitySeoul 02841Republic of Korea

Mg has received much attention as a next-generation implantable material owing to its biocompatibility,bone-like mechanical properties,and biodegradability in physiological *** application of various polymer coatings has been conducted in the past to reduce the rapid formation of hydrogen gas and the local change in pH during the initial phase of the chemical reaction with the body ***,we propose femtosecond(fs)laser-mediated Mg surface patterning for significant enhancement of the binding strength of the coating material,which eventually reduces the corrosion *** of the structural,physical,crystallographic,and chemical properties of the Mg surface have been conducted in order to understand the mechanism by which the surface adhesion increases between Mg and the polymer coating *** on the fs laser conditions,the surface structure becomes rough owing to the presence of several microscaled pits and grooves of nanoporous MgO,resulting in a tightly bonded poly(lactic-co-glycolic acid)(PLGA)*** corrosion rate of the PLGA-coated,fs laser-treated Mg is considerably slow compared with the non-treated Mg;the treated Mg is also more biocompatible compared with the non-treated *** fs laser-based surface modification technique offers a simple and quick method for introducing a rough coating on Mg;further,it does not require any chemical treatment,thereby overcoming a potential obstacle for its clinical use.

关键词： Femtosecond laser Biodegradable metal Polymer coating Surface modification Surface adhesion

Efficacy of Helicobacter pylori eradication for the prevention of metachronous gastric cancer after endoscopic resection for early gastric cancer

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World Journal of Gastroenterology 2014年第11期20卷 2760-2764页

作者： Jae young Jang hoon Jai Chun Division of Gastroenterology Department of Internal MedicineCollege of MedicineKyung Hee UniversitySeoul 136-705South Korea Division of Gastroenterology and Hepatology Department of Internal MedicineInstitute of Digestive Disease and NutritionKorea University College of MedicineSeoul 136-705South Korea

Helicobacter pylori(***)plays an important role in gastric carcinogenesis,as the majority of gastric cancers develop from ***-infected gastric *** rate of early gastric cancer diagnosis has increased in Japan and Korea,where *** infection and gastric cancer are highly *** intestinal-type gastric cancer without concomitant lymph node metastasis is usually treated by endoscopic *** metachronous gastric cancers often develop because atrophic mucosa left untreated after endoscopic treatment confers a high risk of gastric *** efficacy of *** eradication for the prevention of metachronous gastric cancer remains ***,in patients who undergo endoscopic resection of early gastric cancer,*** eradication is recommended to suppress or delay metachronous gastric *** and regularly scheduled endoscopy should be performed to detect minute metachronous gastric cancer after endoscopic resection.

关键词： Helicobacter pylori Gastric cancer Endoscopic resection Metachronous cancer

Appropriate empirical antibiotic use and 30-d mortality in cirrhotic patients with bacteremia

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World Journal of Gastroenterology 2015年第12期21卷 3587-3592页

作者： Hyun Park Ki Jun Jang Won Jang Sang hoon Park Ji young Park Tae Joo jeon Tae hoon Oh Won Chang Shin Won-Choong Choi Dong Hyun Sinn Department of Internal Medicine Sanggye Paik Hospital Inje University Department of Medicine Samsung Medical Center Sungkyunkwan University School of Medicine

AIM: To analyze whether prompt and appropriate empirical antibiotic(AEA) use is associated with mortality in cirrhotic patients with bacteremia. METHODS: A total of 102 episodes of bacteremia in 72 patients with cirrhosis were analyzed. AEA was defined as a using or starting an antibiotic appropriate to the isolated pathogen at the time of bacteremia. The primary endpoint was 30-d mortality. RESULTS: The mortality rate at 30 d was 30.4%(31/102 episodes). Use of AEA was associated with better survival at 30 d(76.5% vs 46.9%, P = 0.05), and inappropriate empirical antibiotic(IEA) use was an independent factor associated with increased mortality(OR = 3.24; 95%CI: 1.50-7.00; P = 0.003, adjusted for age, sex, ChildPugh Class, gastrointestinal bleeding, presence of septic shock). IEA use was more frequent when the isolated pathogen was a multiresistant pathogen, and when infection was healthcare-related or hospital-acquired. CONCLUSION: AEA use was associated with increased survival of cirrhotic patients who developed bacteremia. Strategies for AEA use, tailored according to the local epidemiological patterns, are needed to improve survival of cirrhotic patients with bacteremia.

关键词： Liver cirrhosis Bacteremia Appropriate antibiotics

Life-threatening stress-induced cardiomyopathy combined with acute adrenal crisis

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Journal of Geriatric Cardiology 2017年第6期14卷 423-424页

作者： Ae-young Her Yong hoon Kim Division of Cardiology Department of Internal Medicine Kangwon National University School of Medicine Chuncheon South Korea

Stress-induced cardiomyopathy, also known as Takotsubo cardiomyopathy and left ventricular apical ballooning syndrome, is characterized by transient systolic dysfunction of the apical and mid-segments of the left ventricle with the abscence of coronary occlusion, This disease typically occurs in postmenopausal women of an advanced age after emotional or physical stress. Although the prognosis is generally favorable, acute fatal complications have been reported in a small subset of patients. Some patients died with acute cardiac complications, on the other hand, other patients died with underlying critical illness which triggered stress-induced cardiomyopathy.

关键词： Adrenal crisis Cardiomyopathy

Concomitant acute myocardial infarction and descending thoracic aorta penetrating ulcer

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Journal of Geriatric Cardiology 2016年第11期13卷 935-937页

作者： Yong hoon Kim Ae-young Her Division of Cardiology Department of Internal Medicine Kangwon National University School of Medicine Chuncheon South Korea

Acute coronary syndrome （ACS） refers to a spectrum of clinical presentations ranging from unstable angina to non-ST-segment elevation myocardial infarction （NSTEMI） to ST-segment elevation myocardial infarction （STEMI）. Aortic dissection, intramural hematoma and penetrating atherosclerotic ulcer （PAU） are three major acute aortic syndromes （AAS）.

关键词： Myocardial infarction Penetrating aortic ulcer Stent grafts

Bowel preparations as quality indicators for colonoscopy

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World Journal of Gastroenterology 2014年第11期20卷 2746-2750页

作者： Jae young Jang hoon Jai Chun Division of Gastroenterology Department of Internal MedicineCollege of MedicineKyung Hee UniversitySeoul 130-701South Korea Division of Gastroenterology and Hepatology Department of Internal MedicineInstitute of Digestive Disease and NutritionKorea University College of MedicineSeoul 136-705South Korea

Colonoscopy is the principal investigative procedure for colorectal neoplasms because it can detect and remove most precancerous *** effectiveness of colonoscopy depends on the quality of the *** preparation is an essential part of high-quality colonoscopies because only an optimal colonic cleansing allows the colonoscopist to clearly view the entire colonic mucosa and to identify any polyps or other *** bowel preparation not only prolongs the overall procedure time,decreases the cecal intubation rate,and increases the costs associated with colonoscopy but also increases the risk of missing polyps or adenomas during the ***,a repeat examination or a shorter colonoscopy follow-up interval may be suitable strategies for a patient with suboptimal bowel preparation.

关键词： Colonoscopy Colorectal neoplasm Bower preparation Quality

Absence of enhancement in a lesion does not preclude primary central nervous system T-cell lymphoma:A case report

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World Journal of Clinical Cases 2024年第2期12卷 374-382页

作者： Chan-Seop Kim Chi-hoon Choi Kyung Sik Yi Yook Kim Jisun Lee Chang Gok Woo young Hun jeon Department of Radiology Chungbuk National University HospitalChungbuk National University College of MedicineCheongju-si 28644Chungcheongbuk-doSouth Korea Department of Pathology Chungbuk National University HospitalChungbuk National University College of MedicineCheongju-si 28644Chungcheongbuk-doSouth Korea Department of Radiology Seoul National University HosptialSeoul 03080South Korea

BACKGROUND Primary central nervous system lymphoma(PCNSL)is a non-Hodgkin lymphoma that originates in the central nervous system(CNS)and is exclusively limited to the *** most PCNSLs are diffuse large B-cell lymphomas,primary CNS T-cell lymphomas(PCNSTLs)are *** typically demonstrate some degree of enhancement on contrast-enhanced magnetic resonance imaging(MRI).To the best of our knowledge,non-enhancing PCNSTL has not been reported *** SUMMARY A 69-year-old male presented to the neurology department with complaints of mild cognitive impairment and gradual onset of left lower leg weakness over a span of two *** MRI showed asymmetric T2-hyperintense lesions within the *** enhancement was observed on the contrast-enhanced T1 *** initial diagnosis was neuro-Behçet’s *** high-dose steroid therapy,no alterations in the lesions were identified on initial *** patient’s symptoms deteriorated *** MRI performed one month after the initial scan revealed an increased lesion ***,brain biopsy confirmed the diagnosis of *** patient underwent definitive combined ***,the patient developed bacteremia and died of septic shock approximately three months after *** The absence of enhancement in the lesion did not rule out PCNSTL.A biopsy approach is advisable for pathological confirmation.

关键词： Central nervous system neoplasms Non-Hodgkin Lymphoma T-cell Lymphoma Primary central nervous system lymphoma Primary central nervous system T-cell lymphoma Case report

The association between vitamin D levels and burn factors in different burn types

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Burns & Trauma 2020年第1期8卷 285-292页

作者： Yoon Soo Cho Cheong hoon Seo So young Joo Suk hoon Ohn Department of Rehabilitation Medicine Burn CenterHangang Sacred Heart Hospital94-200 Yeongdeungpo-dongYeongdeungpo-guSeoul 07247Republic of Korea Department of Physical Medicine and Rehabilitation Hallym University Sacred Heart Hospital22 Gwanpyeong-ro 170 Beon-gil Dongan-gu Anyang Gyeonggi-do 14068Republic of Korea

Background:Patients with burns present with different clinical features depending on the types of burn injury and burn patients with lower levels of vitamin D have worse prognoses and more *** study aims to investigate the association between vitamin D levels and burn factors according to each burn type in relation to early intensive rehabilitation therapy initiated for inpatients with ***:In this retrospective study,we enrolled 757 of 1716 inpatients who underwent rehabilitative therapy between May 2013 and April *** types were divided into flame burn,electrical burn and other burns,including scalding,contact and chemical ***,burned body surface area(BSA),wound healing time(WHT),length of hospital stay(LOS)and body mass index were analysed between vitamin D deficient and non-deficient patient groups using Student’s ttests,or Mann-Whitney U test and among three burn types using one-way analysis of variance(ANOVA)or Kruskal-Wallis one-way *** relationship between vitamin D levels and burn factors was evaluated using Pearson’s or Spearman’s correlation coefficient tests,and multiple linear regression analysis in different burn ***:In total,88.9%patients were vitamin D deficient,and these patients had a larger burned BSA(p=0.015)and longer WHT and LOS(all p<0.001)than non-deficient *** BSA,WHT and vitamin D levels showed significant differences in their mean values according to three burn types(all p<0.001).WHT was a communal factor significantly associated with vitamin D levels in all three burn types(p<0.05).The WHT cut-off points to predict vitamin D deficiency were 55 days for flame burn(p<0.001)and 62.5 days for electrical burn(p=0.001).Conclusions:WHTacross all three burn typeswas a common factor associated with vitamin D levels for inpatients with burns who had undergone rehabilitative *** burn patients with vitamin D deficiency,even those with a low burned BSA percentage,showed prol

关键词： Burn factors Vitamin D deficiency Burn type Wound healing time Rehabilitation

Selective laser melting of Fe-Ni-Cr layer on AISI H13 tool steel

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中国有色金属学会会刊：英文版 2009年第4期19卷 921-924页

作者： Byeong-Don JOO jeong-Hwan JANG Jae-Ho LEE young-Myung SON young-hoon MOON School of Mechanical Engineering Pusan National University

An attempt to fabricate Fe-Ni-Cr coating on AISI H13 tool steel was performed with selective laser ***-Ni-Cr coating was produced by experimental facilities consisting of a 200 W fiber laser which can be focused to 80 μm and atmospheric chamber which can control atmospheric pressure with N2 or *** layer was fabricated with various process parameters such as laser power,scan rate and fill *** quality and coating thickness were measured and *** different surface patterns,such as typeⅠ,typeⅡand type Ⅲ,are shown with various test conditions and smooth regular pattern is obtained under the conditions as 10 μm of fill spacing,50-350 mm/s of scan rate and 40 μm of fill spacing,10-150 mm/s of scan *** maximum coating thickness is increased with power elevation or scan rate drop,and average thickness of 10 μm fill spacing is lower than that of 40 μm fill spacing.

关键词：镍铬涂层工具钢激光熔融社会扫描速度铁涂层厚度光纤激光器