순수 타이타늄 기반 산화물분산강화 합금의 미세조직 및 기계적 특성

박태성,김정한,Park, Taesung,Kim, Jeoung Han 한국분말야금학회 2018 한국분말재료학회지 (KPMI) Vol.25 No.4

This study is conducted as a preliminary research to verify the feasibility of Ti-based Oxide dispersion strengthened (ODS) alloy. Pure-Ti powder is mixed with $Y_2O_3$ powder and subsequently, mechanically alloyed at $-150^{\circ}C$. The Ti-based ODS powder is hot-isostatically pressed and subsequently hot-rolled for recrystallization. The microstructure consists of elongated grains and Y excess fine particles. The oxide particle size is larger than that of the typical Fe-based ODS steel. Tensile test shows that the tensile ductility is approximately 25%, while the strength is significantly higher than that of pure Ti. The high-temperature hardness of the Ti-ODS alloy is also significantly higher than that of pure Ti at all temperatures, while being lower than that of Ti-6Al-4V. The dimple structure is well developed, and no evidence of cleavage fracture surface is observed in the fracture surface of the tensile specimen.

이마티니브 메실레이트에 의한 수정체상피세포의 섬유아세포로의 전환분화억제효과

박태성,태준석,박세민,오중협,Tea Sung Park,Jun Seok Tea,Seh Min Park,Jung Hyub Oh 대한안과학회 2005 대한안과학회지 Vol.46 No.2

Purpose: To investigate whether Imatinib mesylate (IM) could inhibit the transdifferentiation of the lens epithelial cells (LECs) into fibroblasts using the capsular bag model. Methods: In the capsular bag model, LECs were cultured by exposure to IM at various concentrations for 3 min. The effect of IM was analysed by observing the covering area, numbers of α-SMA positive cell, and BrdU incorporated proliferating cells. The same analysis was performed in the culture of LECs with TGF-β. Results: The covering area was significantly decreased by the treatment of 30 ?M IM, and the positive cells for α-SMA and BrdU were also decreased by IM treatment in a dose dependent manner. In addition, increasing TGF-β concentration accelerated transdifferentiation, but suppressed the acceleration of the transdifferentiation induced by TGF-β. Conclusions: In the capsular bag model, IM effectively inhibited not only the transdifferentiation of LECs into fibroblasts but also the TGF-β induced acceleration of the transdifferentiation.

성견 발치와에 매식한 2종의 Bovine Bone Powder가 치유에 미치는 영향에 관한 조직학적 연구

박태성,임성빈,정진형,김종여,Park, Tae-Seong,Lim, Sung-Bin,Chung, Chin-Hyung,Kim, Jong-Yeo 대한치주과학회 2000 Journal of Periodontal & Implant Science Vol.30 No.3

Several extraction cases with advanced bone loss as a result of periodontal disease, root or labial bone fracture, extensive caries, and periapical lesions occur esthetic, functional problems and severe bone loss. Therefore, to treat these cases used several surgical methods and socket preservation among this therapies have been evaluated simple, effective and good prognosis in the implant placement. Socket preservation therapy have been used with barrier membranes or/and graft materials. Deproteinized bovine bone mineral have been evaluated ideal grafting materials. Recently, calcium-phosphate thin film coated bovine bone powders were developed in our country, but the study for these material wasn't reported. When two types of xenograft materials were implanted in extraction sockets of Beagle dogs, the effects of these were analyzed after 4 weeks and 8 weeks histological views. The results of this study were as follows. 1. In control groups, 4 weeks after implantation, the extraction sockets were filled with connective tissue which has dilated vessels and epithelial growth. And after 8 weeks, irregular connective bundles were observed. But new bone formation was not seen. 2. In Bio-Oss groups, epithelial growth was not seen and bone powder was covered with connective tissue fiber. New bone formation was found around the interproximal bone. There was no special change seen after 8 weeks, connective tissue fibers became more regular, and bone growth near bone powder was not made well. 3. In Ca-P BBP groups, epithelial cells didn't grow in the extraction sockets, there was a lot of new bone made around the bone powder after 8 weeks, new bone around bone powder was replaced with mature bone. It is thought that bone powder grafting into the extraction sockets is very useful for conservation of ridge, and Ca-P BBP is more effective in bone formation than Bio-Oss.

금속산화물을 이용한 유동층반응기에서 배연탈황특성

박태성,홍성창 ( Tae Sung Park,Sung Chang Hong ) 한국공업화학회 1998 공업화학 Vol.9 No.2

배출가스중의 SO₂제거를 위하여 다양한 금속산화물로 구성된 천연망간광석, 철광석, CuO/γ-Al₂O₃등을 흡착제로 사용하여 고정층반응기에서 흡착용량실험을 하였다. 또한 흡착제중 흡착용량이 떨어지는 철광석을 제외한 두 가지 흡착제를 이용하여 유동층반응기에서 유속, 온도, 입자크기 등의 조업조건에 따른 SO₂ 흡착실험을 수행하였다. 모든 흡착제에서 온도가 증가할수록 흡착량이 증가하는 화학흡착반응을 보였고 유동층반응기에서 U_0/U_mf및 U_0-U_mf와 같은 유속조건에 따라 입자 크기에 따른 흡착량의 변화가 다르게 나타났으며 유동층반응기 성능식으로부터 반응속도상수를 얻었다. 이 실험을 통하여 천연망간광석이 유동층반응기에서 SO₂ 흡착제로의 사용가능성을 확인할 수 있었다. In a fixed bed reactor, adsorption capacity of SO₂in simulated flue gases was investigated with NMO(natural manganese ore), composed of various metal oxides, iron ore and CuO/ γ-Al₂O₃ as adsorbents. The experiment carried out in a fluidized bed reactor with variables such as gas velocity, temperature and particle size. Iron ore was excluded in the fluidized bed reactor experiment for the lower adsorption capacity. The adsorption of SO₂ in metal oxide is a typical chemisorption because the adsorption capacity of all adsorbents increased with temperature. The effect of particle size on the adsorption capacity was varied with the ratio, U_0/U_mf and the difference of U_0- U_mf. U_0 is the gas velocity, U_mf is the minimum fluidization gas velocity. U_0/U_mf and U_0/U_mf explain the behavior of the gas and solids in the fluidized bed reactor. From the performance equation of the fluidized bed reactor, kinetic reaction rate constants were obtained by the non-linear least square method. The adsorption capacity of NMO proved the potential use of SO₂ adsorbents.

스마트 윈도우용 리튬 전도성 전해질 개발

박태성,백희원,진교원,조봉희,김영호 ( Tae Sung Park,Hee Won Back,Gyo Won Chin,Bong Hee Cho,Young Ho Kim ) 한국전기전자재료학회 1997 한국전기전자재료학회 추계학술대회논문집 Vol.1997 No.1

디지털 장비(FRA 510 S)를 활용한 한국 20대 정상 성인 균형능력 평가 및 지표 개발

박태성,김상훈,강종호,신명준,Park, Tae-Sung,Kim, Sang Hun,Kang, Jong-Ho,Shin, Myung-Jun 중소기업융합학회 2020 융합정보논문지 Vol.10 No.9

This study intends to evaluate the balance ability of Korean adults in their 20s and create balance indicators using digital equipment(FRA 510 S). The study participants participated in 50 men and women in their 20s without musculoskeletal and nervous system diseases. For data analysis, Repeated Measures ANOVA was used. As a result of the study, it was confirmed that the movement of the body weight was higher when the eyes were closed and the test was performed than when the eyes were opened on a flat floor and a balance pad(47cm×39cm×5.5cm). And there was no difference according to the gender of men and women. In a future study, it is considered that the balance ability of normal elderly people will be evaluated, and the balance index of normal adults in Korea will be created and applied to the evaluation of patients with impaired balance ability. 본 연구는 디지털 장비(FRA 510 S)를 활용하여 한국의 20대 정상 성인의 균형능력을 평가하고 균형지표를 만들고자 한다. 본 연구 참여자는 근골격계, 신경계 질환이 없는 20대 정상 성인 남녀 각각 50명씩 참여를 하였다. 데이터 분석은 반복측정 분산분석을 사용하였다. 본 연구 결과 남, 여 모두 평평한 바닥과 밸런스 패드(47cm×39cm×5.5cm)에서 눈을 뜨고 있을 때보다 눈을 감고 검사를 진행하였을 때 체중심의 이동이 많은 것을 확인하였다. 그리고 남, 여 성별에 따른 차이는 없었다. 추후 연구에서는 정상 노인의 균형능력을 평가하여 한국의 정상 성인의 균형지표를 만들고 균형능력이 손상된 환자 평가에 적용이 가능할 것이라고 생각된다.

진공증착법으로 제작한 CdS 박막의 열처리효과

박태성,진교원,김영호,한은주,김근묵,Park, Tae-Seong,Jin, Gyo-Won,Kim, Yeong-Ho,Han, Eun-Ju,Kim, Geun-Muk 한국재료학회 1997 한국재료학회지 Vol.7 No.11

열증착법에 의해서 온도 85$^{\circ}C$인 glass기판 위에 CdS 박막을 제작하였다. 두께가 200nm정도로 측정된 CdS박막은 공기 중에서 온도 25$0^{\circ}C$-55$0^{\circ}C$범위에서 각각 30분간 열처리 되었으며 이들 시료에 대하여 4-point probe, XRD, SEM, UV-Spectrophotometer 및 광발광 측정으로 전기적 광학적 특성을 조사하였다. 이들의 일련의 실험값은 열처리 온도 37$0^{\circ}C$ 근처에서 구조의 변화를 보여주었는데, 열처리 온도에 대한 비저항아니 XRD, SEM 의 측정은 cubic로부터 hexagonal구조로의 변환을 나타내었다. 특히 상온에서 측정한 광발광에서 green edge emission(GEE)피이크가 2.42eV를 나타내었는데 이 때의 발광 중심은 열처리할 때 생긴 S-vacancy에 보상된 산소로 이루어진 'CdO'의 악셉터준위에 기인하는 것으로 해석되며 그 이온화 에너지는 약 0.16eV이었다.

정보화사회에서 여성인력 활용

박태성,Park, Tae-Seong 한국정보통신집흥협회 1996 정보화사회 Vol.104 No.-

이성분입자계 유동층에서의 층팽창 연구

박태성,장현태,홍성창,도동섭 ( T . S . Park,H . T . Jang,S . C . Hong,D . S . Doh ) 한국화학공학회 1996 화학공학의이론과응용 Vol.2 No.2

선회다짐기 다짐곡선을 이용한 아스팔트 혼합물의 소성변형 특성 평가

박태성,이병식,현성철,이관호,Park. Tae-Seong,Lee. Byung-Sik,Hyun. Seong-Cheol,Lee. Kwan-Ho 한국방재학회 2007 한국방재학회논문집 Vol.7 No.3

지금까지 이용된 아스팔트 혼합물 배합설계는 주로 마샬다짐방법을 이용하여 시편을 제작하였고, 정해진 공극률에 맞추어 제작된 시편의 간단한 역학적 특성치를 이용하였다. 선회다짐기를 이용한 다짐방법은 아스팔트 포장의 시공과정 및 시공 후 발생하는 아스팔트 표층의 다짐정도를 실내에서 구현할 수 있는 다짐방법이다. 선회다짐기를 이용하는 슈퍼페이브 배합설계는 주로 아스팔트 포장의 공용성 측면에 맞추어 이용되고 있다. 그러나, 선회다짐기는 아스팔트 혼합물의 다짐특성을 평가할 수 있는 좋은 다짐방법임에도 불구하고, 주로 시편제작용으로만 이용되고 있는 실정이다. 본 연구에서는 슈퍼페이브 선회다짐기의 중요 특징중의 하나인 아스팔트 혼합물의 다짐 특성을 평가할 수 있는 지표를 개발하고, 이를 국내 아스팔트 혼합물 다짐곡선에 적용해 보는 것이다. 선회다짐기의 다짐곡선으로부터 얻을 수 있는 다짐특성지표는 크게 다짐에너지지수와 교통다짐에너지지수가 대표적인 값이다. 이러한 다짐에너지 곡선을 이용하여 아스팔트 혼합물의 소성변형 가능성을 평가하였고, 이를 적용할 수 있는 기준안을 제시하였다. For the time being, HMA test specimen were prepared by Marshall Compaction Method for hot mix asphalt design and evaluated the mechanical properties of HMA at the specified air voids. Gyratory Compaction can simulate the field compaction process and measure the degree of compaction just after field compaction in laboratory. Superpave mix design with Gyratory compactor has been used for characterization of performance. The curve of gyratory compaction can be used to evaluate the permanent deformation potential of hot mix asphalt. In this paper, couple of indices for hot mix asphalt have been showed for hot mix asphalt in Korea. The major properties from gyratory compaction curve are compaction energy index and traffic compaction index. The specific guide line for the potential of hot mix asphalt has been proposed.