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Effects of Chairside Polishing and Brushing on SurfaceRoughness of Acrylic Denture Base Resins

Journal of Wuhan University of Technology(Materials Science) 2009年第1期24卷 100-105页

作者： Seung-kyun Kim ju-Mi Park Min-Ho Lee jae-Youn jung Shipu Li Xinyu Wang Department of Prosthodontics and Institute of Oral Bioscience School of Dentistry Chonbuk National University Jeonju Republic of Korea Department of Dental Biomaterials and Institute of Oral Bioscience School of Dentistry Chonbuk National University Jeonju Republic of Korea Division of Mechanical & Aerospace System Engineering and RCIT Chonbuk National University Jeonju Republic of Korea Biomedical Materials and Engineering Research Center Wuhan University of Technology Wuhan 430070 China

The effects of 3 chairside polishing kits and mechanical brushing on the surface roughness of 3 different acrylic denture base resins were compared. Acrylic denture base resins （auto-polymerizing, heat-polymerizing, injected heat-polymerizing resins） were examined after a tungsten carbide bur, and after chairside polishing using 3 polishing kits and pumice. The specimens were subjected to mechanical brushing using a wear tester to simulate 30 000 strokes of brushing. The surface roughness of the acrylic denture base resin specimens was measured using a contact pro-filometer. After the test, the random polished acrylic resins were evaluated by scanning electron mi-croscopy （SEM） and atomic force microscopy （AFM）. Acrylic denture base resins polished using the 3 types of polishing kits had a smoother surface than those finished with the tungsten carbide bur （p〈0.05）. The surface of the resin polished by a TC cutter exceeded the Ra of 0.2 μm （p〈0.05）. The auto-polymerizing resin showed a significantly higher surface roughness than the heat-polymerizing resin and injected heat-polymerizing resin （p〉0.05）. In the case of polishing step wise, there was almost no change in surface roughness after brushing （p〉0.05）.

关键词： acrylic denture base resin polishing brushing surface roughness

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Nature Experience, Recreation Activity and Health Benefits of Visitors in Mountain and Urban Forests in Vienna, Zurich and Freiburg

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Journal of Mountain Science 2015年第6期12卷 1551-1561页

作者： ju-hyoung LEE Duk-jae LEE Department of Forest Resources Faculty of Natural Resources Yeungnam University Department of Forest Resources College of Life & Environmental Science Daegu University

Mountain forests are managed for various purposes. Of these, recreation, leisure, and ecotourism are increasingly gaining prominence. Yet, with the development of new techniques for creating and managing urban forests, the perception of the public with regard to mountain forests and such urban forests is narrowing. For the purpose of this study, eight mountain forests and urban forests located in Zurich(Switzerland), Vienna(Austria) and Freiburg(Germany) were shortlisted. These places are renowned for their well-functioning management of mountain forests and creation of urban forests. As the study was to focus on the comparison of the perceptions of visitors in terms of their satisfaction in urban and mountain forests, the interview covered the following questions:(i) how satisfactory was the nature experience;(ii) how satisfactory were the outdoor recreational activities;(iii) whether the nature experiences influenced the mental and physical health of visitors. Responses thus received for each of the mountain forests and urban forests were assessed, with the total number of respondents being 247. Tourists visiting the selected areas were randomly chosen for a one-on-one interview survey. Results of the survey show that there is a clear perceptions of visitors differed between urban and mountain forests. However, the gap is insignificant or almost nonexistent with respect to satisfaction level of outdoor recreational activities and health benefits. These results are contrary to the findings of previous studies, which argued that the natural landscape of mountain areas is superior to other artificially built green spaces. Visitors did not perceive significant differences in outdoor recreational activities and health effects between the two spaces.

关键词： Europe Satisfaction Outdoor recreation Interview survey Preference

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miR-215 overexpression distinguishes ampullary carcinomas from pancreatic carcinomas

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Hepatobiliary & Pancreatic Diseases International 2015年第3期14卷 325-329页

作者： Dong Ho Choi Sang jae Park Hark kyun Kim Department of Surgery Hanyang University School of Medicine Center for Liver Cancer National Cancer Center Biomolecular Function Research Branch National Cancer Center

Distinguishing ampullary carcinoma from pancreatic carcinoma is important because of their different prognoses. microRNAs are differentially expressed according to the tissue of origin. However, there is rare research on the differential diagnosis between the two types of cancers by microRNA in periampullary cancers. The present study was undertaken to compare microRNA profiles between ampullary and pan- creatic carcinomas using microarrays, miR-215 was most significantly overexpressed in ampullary carcinomas; whereas the expressions of miR-134 and miR-214 were significantly lower in ampuUary carcinomas than in pancreatic carcino- mas. When these discriminatory microRNAs were applied to liver metastases, they were correctly predicted for the tissue of origin. Although this study is limited by small sample size, striking difference in microRNA expression and concordant expression of discriminating microRNAs in primary tumors and metastases suggest that these novel discriminatory mi- croRNAs warrant future validation.

关键词： ampulla of Vater pancreatic cancer gene expression

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Endoscopic stenting for recurrence-related colorectal anastomotic site obstruction:Preliminary experience

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World Journal of Gastroenterology 2014年第38期20卷 13936-13941页

作者： jung Ho Kim Jong Joon Lee jae Hee Cho Kyoung Oh Kim jun-Won Chung Yoon jae Kim Kwang An Kwon Dong kyun Park ju Hyun Kim Department of Internal Medicine Gachon University Gil Medical Center

AIM: To evaluate the efficacy of stents in treating patients with anastomotic site obstructions due to cancer recurrence following colorectal surgery.

关键词： Colorectal neoplasms Endoscopy Intestinal obstruction Stents Surgical anastomosis

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Effect of a seasonal diffuse pollution migration on natural organic matter behavior in a stratified dam reservoir

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Journal of Environmental Sciences 2010年第6期22卷 908-914页

作者： Soon ju Yu jae Yil Lee Sung Ryong Ha National Institute of Environmental Research Department of Urban Engineering Chungbuk National University

This article aims to describe the influence of diffuse pollution on the temporal and spatial characteristics of natural organic matter （NOM） in a stratified dam reservoir, the Daecheong Dam, on the basis of intensive observation results and the dynamic water quality simulation using CE-QUAL-W2. Turbidity is regarded as a comprehensive representation of allochothonous organic matter from diffuse sources in storm season because the turbidity concentration showed reasonable significance in a statistical correlation with the UV absorbance at 254 nm and total phosphorus. CE-QUAL-W2 simulation results showed good consistency with the observed data in terms of dissolved organic matter （DOM） including refractory dissolved organic carbon （RDOC） and labile DOC and also well explained the internal movement of constituents and stratification phenomenon in the reservoir. Instead turbidity and NOM were related well in the upper region of the reservoir according to flow distance, gradually as changing to dissolved form of organic matter, RDOM affected organic matter concentration of reservoir water quality compared to turbidity. To control the increase of soluble organic matters in the dam reservoir, appropriate dam water discharge gate operation provided effective measurement. Because of the gate operation let avoid the accumulation of organic matter within a dam reservoir by shorten of turbid regime retention time.

关键词： CE-QUQL-W2 natural organic matter stratified dam reservoir turbidity flow

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Endoscopic features suggesting gastric cancer in biopsy-proven gastric adenoma with high-grade neoplasia

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World Journal of Gastroenterology 2014年第34期20卷 12233-12240页

作者： jung Ho Kim Yoon jae Kim jungsuk An Jong Joon Lee jae Hee Cho Kyoung Oh Kim jun-Won Chung Kwang An Kwon Dong kyun Park ju Hyun Kim Department of Internal Medicine Gachon University Gil Medical CenterNamdong-guIncheon 405-760South Korea Department of Pathology Gachon University Gil Medical Center21 Namdong-daero 774 beon-gilNamdong-guIncheon 405-760South Korea

AIM: To elucidate the endoscopic features that predict the cancer following endoscopic submucosal dissection (ESD) in patients with high-grade neoplasia (HGN).

关键词： Stomach Neoplasms Carcinoma Adenoma Endoscopy Dissection Risk factors

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Dilute H_2SO_4 solution for copper seed cleaning in electroplating

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Transactions of Nonferrous Metals Society of China 2013年第2期23卷 562-566页

作者： Youn-Seoung LEE jae-Sik YOON Yang-Rae JO Heesoo LEE Sa-kyun RHA Department of Information Communication Engineering Hanbat National University School of Materials Science and Engineering Pusan National University Department of Materials Science and Engineering Hanbat National University

The effects of surface cleaning to eliminate the surface oxides formed on Cu seed layer with dilute H2SO4 solution were investigated. Cu seed layer formed on Ti/Si（100） wafer by sputter deposition was exposed to air to grow native Cu oxide. Dilute H2SO4 solutions and/or TS-40A alkaline soak cleaner were used to remove the native Cu-oxide. After mainly carbon groups （such as C=O） on surface of Cu seed layer were removed by pretreatment of TS-40A alkaline solution, subsequently, dilute H2SO4 acid solution removed Cu-oxides （Cu20 and CuO） as well as a lot of O=C and Cu（OH）2.

关键词： pretreatment copper-oxide H2SO4 XPS sheet resistance

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Numerical evaluation of buckling behavior in space structure considering geometrical parameters with joint rigidity

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Journal of Central South University 2014年第3期21卷 1115-1124页

作者： Su-Deok Shon kyung-ju Hwang Seung-jae Lee School of Architectural Engineering Korea University of Technology and Education School of Architecture University of Seoul

The buckling behavior of single layer space structure is very sensitive. The joint rigidity, moreover, is one of the main factors of stability which may determine the entire failure behavior. Thus, the reasonable stiffness of joint system, which is neither total pin assumption nor perfect fix condition, is very important to apply to the real single layer space one. Therefore, the purpose of this work was to investigate the buckling behavior of single layer space structure, using the development of the upgraded stiffness matrix for the joint rigidity. To derive tangential stiffness matrix, a displacement function was assumed using translational and rotational displacement at the node. The geometrical nonlinear analysis was simulated not only with perfect model but also with imperfect one. As a result, the one and two free nodal numerical models were investigated using derived stiffness matrix. It was figured out that the buckling load increases in proportion to joint rigidity with rise-span ratio. The stability of numerical model is very sensitive with the initial imperfection, responding of bifurcation in the structure.

关键词： space frame geometric nonlinearity snap-through bifurcation initial imperfection joint rigidity

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Corrosion characteristics of single-phase Mg-3Zn alloy thin film for biodegradable electronics

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Journal of Magnesium and Alloys 2023年第9期11卷 3241-3254页

作者： Ji-Woo Gu jae-Young Bae Guangzhe Li Hae Won Hwang So-Hyeon Lee Sung-Geun Choi ju-Young Kim Myoung-Ryul Ok Yu-Chan Kim Seung-kyun Kang Department of Materials Science and Engineering Seoul National University(SNU)Seoul 08826Republic of Korea Research Institute of Advanced Materials(RIAM) Seoul National UniversitySeoul 08826Republic of Korea Soft Foundry Nano Systems Institute(NSI) Seoul National UniversitySeoul 08826Republic of Korea Biomaterials Research Center Biomedical Research DivisionKorea Institute of Science and Technology(KIST)Seoul 34141Republic of Korea Division of Bio-Medical Science and Technology KIST SchoolKorea University of Science and TechnologySeoul 02792Republic of Korea Department of Materials Science and Engineering Ulsan National Institute of Science and Technology(UNIST)Ulsan 44919Republic of Korea

Biodegradable metals as electrodes, interconnectors, and device conductors are essential components in the emergence of transient electronics, either for passive implants or active electronic devices, especially in the fields of biomedical electronics. Magnesium and its alloys are strong candidates for biodegradable and implantable conducting materials because of their high conductivity and biocompatibility, in addition to their well-understood dissolution behavior. One critical drawback of Mg and its alloys is their considerably high dissolution rates originating from their low anodic potential, which disturbs the compatibility to biomedical applications. Herein, we introduce a single-phase thin film of a Mg-Zn binary alloy formed by sputtering, which enhances the corrosion resistance of the device electrode, and verify its applicability in biodegradable electronics. The formation of a homogeneous solid solution of single-phase Mg-3Zn was confirmed through X-ray diffraction and transmission electron microscopy. In addition, the dissolution behavior and chemistry was also investigated in various biological fluids by considering the effect of different ion species. Micro-tensile tests showed that the Mg-3Zn alloy electrode exhibited an enhanced yield strain and elongation in relation to a pure Mg electrode. Cell viability test revealed the high biocompatibility rate of the Mg-3Zn binary alloy thin film. Finally, the fabrication of a wireless heater demonstrated the integrability of biodegradable electrodes and highlighted the ability to prolong the lifecycle of thermotherapy-relevant electronics by enhancing the dissolution resistance of the Mg alloy.

关键词： Biodegradable alloy Mg-3Zn binary alloy Solid-solution thin film electrode Biodegradable conductor Transient electronics

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Colo-colonic intussusception with post-polypectomy electrocoagulation syndrome:A case report

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World Journal of Clinical Cases 2022年第25期10卷 8939-8944页

作者： jae Young Moon Min-Ro Lee Sung kyun Yim Gi Won Ha Department of Surgery Jeonbuk National University HospitalJeonju 561-180JeonbukSouth Korea Research Institute of Clinical Medicine of Jeonbuk National University-Biomedical Research Institute of Jeonbuk National University Hospital Jeonju 561-180JeonbukSouth Korea Department of Internal Medicine Biomedical Research InstituteJeonbuk National University Hospital and Medical SchoolJeonju 54907JeonbukSouth Korea

BACKGROUND Post-polypectomy electrocoagulation syndrome(PPES)can occur after colonoscopic polypectomy and is usually treated conservatively with a positive ***,there can be cases with complications *** SUMMARY A 58-year-old woman,who had no previous medical history,visited the Emergency Department of another hospital with symptoms of abdominal pain and fever,1 d after multiple colonoscopic *** abdominopelvic computed tomography(CT)scan demonstrated colo-colonic intussusception,and she was transferred to our hospital to consider an *** showed colocolonic intussusception with PPES and no evidence of *** physical examination showed localized mild tenderness on the right sided *** patient fasted and was admitted for treatment with intravenous antibiotics(piperacillin/tazobactam 4.5 g each 8 h,ornidazole 500 mg each 12 h).After admission,the symptoms got better and a follow-up CT scan demonstrated resolution of the PPES and *** patient was discharged on hospital day *** Colo-colic intussusception can occur with PPES,and it can be properly treated conservatively.

关键词： Intussusception Endoscopy Colonoscopy Colonic polyps Intestinal polyps Case report

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