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타타늄의 열처리 조건에 따른 동전위 양극분극특성 및 표면 미세구조 변화
주동현,이용렬,정영화,양홍서,박상원,이도재,송호준,박영준 大韓齒科器材學會 2002 대한치과재료학회지 Vol.29 No.2
The corrosion resistance of metallic implants is essential for successful implant osseointegration. Moreover, the implant surface should have appropriate surface roughness for the attachment of the osteoblast and collagen fibrils. When titanium is exposed to air a thermodynamically very stable oxide film is formed at once. This oxide is very thin and yet it protects the metal from corrosion instantaneously. However, the oxide would not be ideal, and it would be supposed that the state of oxide film would be various by the different conditions when it is formed. The objective of this study was to evaluate the electrochemical properties and surface microstructural changes of titanium after passivation treatment or exposure to high heat (in vacuum or in air). ASTM grade 2 commercially pure titanium (Ti) disks of 10㎜ diameter were wet ground and polished with 240 and 600 grit SiC, and then ultrasonically cleaned with distilled water and ethanol. Cleansed as-received samples (As-R group) were passivated with 30% nitric acid solution at 50℃ for 15 minutes to make the Pas group. The Std-V samples were made by treating the Ti disks in vacuum quartz tube (10^-8 Torr) at 530℃ for 40 min for stress relieving, followed by annealing at 700℃ for 90 min, and then slow cooling to room temperature. The Std-A samples undergo identical procedure as the Std-V group except that it is done in air. For 530℃-V samples, Ti disks were heated at 530℃ for 40 minutes and slow cooled to room temperature. The 1000℃-V samples were produced by heating Std-V specimens again at 1000℃ for 2 hr, followed by cooling to room temperature. 530℃-A and 1000℃-A samples were also prepared. Potentiodynamic anodic polarization measurement, SEM, AFM and XRD analysis were performed to evaluate the effects of the various treatments. The difference in the mean values of E_corr between groups showed statistically significant difference (P<0.05), but that of I_corr did not show significance (P>0.05). When Ti surface was passivated there was a shift of corrosion potential (E_corr) in the noble direction and a lower corrosion current density (I_corr) value. Std-A samples showed most noble E_corr value among the tested groups. 530℃-V samples showed more noble E-corr than other tested groups except Std-A group. 1000℃-V samples showed more noble E-corr than those of Std-V sample. In the case of Std-, 530℃- and 1000℃-groups, -A sub-groups showed better corrosion resistant characteristics than -V sub-groups in regard to E-corr and I_corr values. In the SEM observations, the surfaces of the As-R samples showed only scratch line on smooth surface. In Pas samples, thick oxide layer covered the surface under high magnification observation. 530℃-A samples were covered by oxide granules, and Std-A samples had 25~50 nm-thick acicular oxides. The 1000℃-A samples were covered by coarse oxide crystals with a granule diameter of 0.1~0.6 μm having a gross appearance of milky white color, which was identified by XRD as a rutile. On the other hand, 1000℃-V samples showed an Widmansta¨tten structrue of which the orientation of the lattice is formed along crystallographic planes of the parent crystals. On the AFM observation, 530℃-A samples showed RMS roughness of 79.38 nm which is 5 times rougher than those of the As-R samples. Std-A sample had a roughness of 330.47 nm which is about 20-times rougher than that of the As-R sample. 1000℃-A samples were covered by coarse granular oxides and the roughness were about 0.56 μm. Vacuum sub-group samples showed a more smooth surface than air sub-group samples, and the oxide film was more dense. Due to variability of the surface treatment and heat treatment conditions, the process of the oxide formation seems to be affected thereby making the corrosion properties and surface micro-morphology different. However, more various electrochemical analysis together with surface analysis, and an investigation for the effects of those on the osteoblast cell adhesion and calcium phosphate apposition are needed for the improvement of the osseointegration rates of the titanium implants.
Kim, Woong Ji,Kim, So Ri,Choe, Yeong Hun,Lee, Ka Young,Park, Seoung Ju,Lee, Heung Bum,Chung, Myoung Ja,Jin, Gong Yong,Lee, Yong Chul The Korean Academy of Medical Sciences 2008 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.23 No.6
<P>Clear cell tumor of the lung is a rare and very unusual benign pulmonary tumor. As clear cell tumor of the lung contains abundant cytoplasmic glycogen, this tumor is called 'sugar tumor'. We report a case of sugar tumor in a 64-yr-old man presenting as a round pulmonary nodule. On dynamic computed tomography (CT) scans, the solitary pulmonary nodule showed early wash-in enhancement with an early washout pattern like a lung malignancy. The patient underwent wedge resection for the tumor. Pathologic examination, including immunohistochemical studies, revealed that the nodule was a benign clear cell tumor, so-called 'sugar tumor'. Because only a small number of cases have been reported previously, clinical aspects, radiological characteristics on dynamic contrast-enhanced CT, and differential diagnosis of the tumor are not well established. Herein we present a clear cell tumor of the lung and discuss the clinical, radiological, and pathological features of the tumor.</P>
컴퓨터 작업 시 의자 등받이 위치가 근육 활성도에 미치는 영향
김민우,변승진,이경은,정소영,조주영,최원자,최찬양,김경 대구대학교 특수교육재활과학연구소 2011 再活科學硏究 Vol.29 No.1
이 연구는 컴퓨터 작업시 의자 등받이 위치가 근육활성도에 미치는 영향을 알아보기 위해 36명의 근골격에 문제가 없는 성인 남녀가 참가하였으며 대상자들은 등받이가 뒤에 있는 의자와 등받이가 없는 의자, 등받이가 앞에 있는 우리들 의자를 무작위로 배정하고 동일한 컴퓨터 작업을 실시하게 하였다. 실험 중, 표면근전도기를 사용하여 의자에 따른 위등세모근, 머리널판근 그리고 척주세움근의 근활성도 변화를 측정하였다. 이 연구의 결과를 종합해보면 등받이가 앞에 있는 의자는 허리 근육의 부담을 줄이지만 목근육에 부담이 늘어나고 등받이가 뒤에 있는 의자와 없는 의자는 허리근육에는 다소 무리가 가지만 목근육에는 부담이 덜하다는 것을 알 수 있었다. 이러한 결과로 환자의 증상에 다라 컴퓨터 작업을 하는 동안 의자 등받이의 위치를 조절하여 치료에 도움이 될 수 있다고 생각되어진다. Objective : In this study, we checked and observed people's change of body muscle and muscle activity who do computer work on different chairs. We set three kind of chairs which one is a stool and another one is the back is fixed, and the other one is the back is fixed in front of chair. Subject : Accounting for 36 health men and women, we divided these people to 3 groups and put them on the three cases(position 1, position 2, position 3). We measured muscle activity of upper trapezius, Splenius Cervics, Erector Spinae from the groups by using surface electromyogram system. Methods : The standard of the electromyogram was 'reference voluntary contraction', and we carried out 'one way anova' to compare muscle activity of three groups. Results : In position 1, reference voluntary contraction of upper trapezius muscle activity was 123.2821%, Splenius Cervics was 141.7526%, and Erector Spinae was 254.5233%. In position 2, reference voluntary contraction of upper trapezius muscle activity was 132.9395%, Splenius Cervics was 141.7526%, and Erector Spinae was 246.6540%. In position 3, reference voluntary contraction of upper trapezius muscle activity was 190.6487%, Splenius Cervics was 270.2332%, and Erector Spinae was 182.1021%. Both upper trapezius and Splenius Cervics muscle activity of position 3 group was higher than the others groups. In position 1 group, Erector Spinae muscle activity was hight than the other groups. And either was position 2 group's(p<0.05). Conclusion : Therefore the chair which is the back is fixed in front is more comfortable for waist muscle but it's not good for neck. And the other chairs are better in waist muscle but not in neck muscle. So far, when we do a computer work, it's prefer to sit on the group 1&2's chairs to reduce neck muscle's stress and sit on group 3's chair to reduce waist muscle's stress.
Preparation of GF37 for the improvement of respiratory inflammation
Ju Yeong So,Min Jung Kim,Go Woo Choi,You Jin Lee,Yun Ho Jo,Sejeong Kim,Danhui Kim,Sang Hun Lee,Een Yeong Park,Dae Seok Yoo,Jin Seong Kim,Sang Won Cho,Young Soo Kim,Hak Joo Choi,Mi Kyung Pyo 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10
Panax ginseng (PG) and Perilla frutesens (PF) leaves have antioxidant and anti-inflammatory action, which can alleviate various diseases caused by fine dust. Therefore, the purpose of this study is to find the optimal ratio of ginseng and perilla leaves to maximize the anti-inflammatory action. PG and PF were extracted three times for 6 h at 70℃ with 70% ethanol and concentrated in vacuum, respectively, and then powdered by spray dryer. PG:PF were each made at different ratios to make 9 samples; CHJ1 (1:9), CHJ2 (2:8), CHJ3 (3:7), CHJ4 (4:6), CHJ5 (5:5), CHJ6 (6:4), CHJ7 (7:3), CHJ8 (8:2), CHJ9 (9:1). Each sample was measured TNF-a, IL-6, and ROS against fine dust (PM10) using MH-S cells. Among the 9 mixed samples, CHJ2 and CHJ3 inhibited the inflammation and oxidative stress induced by fine dust the best. In a confirmation experiment comparing these samples with PG and PF samples, the CHJ2 sample was finally selected because it had the best anti-inflammatory and antioxidant effects at a low concentration. Finally, a CHJ2 sample in which PG and PF were mixed in a 3:7 ratio was selected as a material for improving respiratory inflammation, and was named GF37.
일반연제 발표 : 당뇨병성 미세 혈관 합병증에서 Glucose transporter(GLUT-1) 유전자의 polymorphism에 대한 연구
강영선 ( Kang Yeong Seon ),지이화 ( Ji I Hwa ),이소영 ( Lee So Yeong ),한상엽 ( Han Sang Yeob ),신진호 ( Sin Jin Ho ),권영주 ( Kwon Yeong Ju ),차대룡 ( Cha Dae Lyong ),조원용 ( Jo Won Yong ),표희정 ( Pyo Hui Jeong ),김형규 ( Kim H 대한신장학회 2002 춘계학술대회 초록집 Vol.21 No.1
급성 위식도정맥류 출혈에 내시경 N-butyl-2-cyanoacryl주입요법의 효과 TIPS의 치료 효과와의 비교 검토
노두영 ( No Du Yeong ),박선영 ( Park Seon Yeong ),주소영 ( Ju So Yeong ),박창환 ( Park Chang Hwan ),이완식 ( Lee Wan Sig ),주영은 ( Ju Yeong Eun ),김현수 ( Kim Hyeon Su ),최성규 ( Choe Seong Gyu ),유종선 ( Yu Jong Seon ),김세종 ( 대한소화기학회 2004 대한소화기학회지 Vol.43 No.3
Background/Aims: Though endoscopic therapies such as variceal ligation and sclerotherapy has been performed, bleeding from the large esophageal and gastric varices still poses significant risk of death. Decrease of portal pressure by TIPS (transjugular intrahepatic portosystemic shunt) or surgical shunt was indicated as cause of failure of endoscopic therapies. Treatment of N-butyl-2-cyanoacrylate has been especially effective for gastric variceal bleeding, but comparison with other treatments had not been reported yet. In this study, the effect of cyanoacrylate injection therapy was cross-examined with the result of TIPS in acute esophagogastric variceal bleedings. Methods: From April 1995 to June 2002, endoscopic cyanoacrylate injection therapy (43 cases) and TIPS (63 cases) were performed in our hospital. Each group was analysed regarding their clinical results including initial hemostasis rate, rebleeding rate, survival duration, mortality and morbidity. Results: Initial hemostasis rate was 95.3% in cyanoacrylate group and 92.1% in TIPS group. Cumulative probability of rebleeding was not different between two groups. Overall complication rates associated with the procedure were 50.8% in TIPS group and 9.3% in cyanoacrylate group. There was no significant difference between two groups in their survival rates. Conclusions: Cyanoacrylate injection therapy was relatively safe, and has comparable results with TIPS for uncontrollable and severe esophagogastric variceal bleedings. (Korean J Gastroenterol 2004;43:186-195)
췌담도 ; 간세포암에 의해 발생된 간외담관종괴의 관강내 세경초음파검사(IDUS)의 소견
문종호 ( Mun Jong Ho ),주종우 ( Ju Jong U ),권계원 ( Kwon Gye Won ),진소영 ( Jin So Yeong ),차상우 ( Cha Sang U ),천영국 ( Cheon Yeong Gug ),김영석 ( Kim Yeong Seog ),조영덕 ( Jo Yeong Deog ),김연수 ( Kim Yeon Su ),이준성 ( Lee Ju 대한소화기학회 2003 대한소화기학회 추계학술대회 Vol.2003 No.-
<목적> 간세포암으로 인한 간외담관폐쇄는 간세포암의 1∼5% 정도에서 관찰되는 비교적 드문 병변이다. 이러한 병변은 수술적 절제가 가능한 경우가 많아(?) 수술전 진단이 중요하나 지금까지의 영상진단 방법으로는 간외담관암과의 감별이 어려웠다. 이에 연자 등은 간외담관협착으로 유도선하 관강내 세경초음파검사(intraductal US, 이하 IDUS)를 시행한 환자 중 간세포암으로 인한 간외담관폐쇄 소견을 보인 환자들을 후향적으로 조사하여 IDUS상 특징적인