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- 저자 : 박영옥 (검색결과 421 건)
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박영옥,구철오,임정환,김홍룡,손재익,이영우 한국에너지학회 1998 에너지공학 Vol.7 No.1
A neutralized fabric filter of which major raw materials were polyester and stainless steel fibers was developed and its physiochemical properties and basic filter characteristics were investigated. Four finds of dusts generated in the typical domestic industry were used, which were coke dust from a steel manufacturing process, cement dust from a cement manufacturing process, flu ash from a fluidized-bed combustor, and incinerator ash from a waste plastics incinerator. The physicochemical properties of the neutralized fabric filter were analyzed in terms of changes in tensile strength and initial elastic modulus under $SO_2$ and $NO_2$ atmospheres, mean flow pore pressure, bubble point pore diameter, mean flow pore diameter, and pore size distribution. In addition, the pressure drop, dust penetration, and figure of merit for the fabric filter were investigated in a bench-scale filter testing unit. The pressure drop increased as the filtration velocity and dust loading increased, and its increasing shape depended on the type of dust. The dust penetration rapidly decreased as the dust loading increased irrespective of the type of dust. The figures of merit for the fabric filters increased in the early stage of filtration and then showed rapid decreases followed maintaining a constant level.
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박영옥,구철오,임정환,김홍룡,손재익,이영우 한국에너지학회 1998 에너지공학 Vol.7 No.1
A high temperature fabric filter was developed and characterized in order to solve the various problems encountered in the operation of industrial fabric filters. Four kinds of dusts generated in the typical domestic industry were used for its characterization, coke dust from a steel manufacturing process, cement dust from a cement manufacturing process, fly ash from a fluidized-bed combustor, and incinerator ash from a waste plastics incinerator. The physical and chemical properties of the high temperature fabric filter were analyzed in terms of mean flow pore pressure, bubble point pore diameter, mean flow pore diameter, pore size distribution, and the changes in tensile strength and initial elastic modulus under $SO_2$ and $NO_2$ atmospheres. Pressure drop, dust penetration, and figure of merit for the fabric filter were also investigated in a bench-scale filter testing unit. The fabric filter developed in this study had good physical and chemical filter properties and showed a very applicability to typical industrial dusts treatments.
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유연하고 얇은 알루미늄 포일을 사용한 다공성 알루미나 막 제작
박영옥,김승우,고태준,Park, Young-Ok,Kim, Seung-Woo,Kouh, Tae-Joon 한국자기학회 2007 한국자기학회지 Vol.17 No.2
We have fabricated porous aluminum oxide using flexible and thin aluminum foils with thickness of 0.025 and 0.2 mm. These foils were anodized with 0.3 M oxalic acid solution after being electropolished with ethanol/perchloric acid. During the anodization, the temperature of the electrolyte was maintained at $9^{\circ}C$ and the anodization voltage was varied between 0.4 and 40 V The surface of the anodized aluminum oxide was studied with a scanning electron microscope. From the scanning electron micrograph, we observed that when the voltage applied was above 1 V for a long period of time, due to a strong electrolysis reaction in electrolyte, the surface of the anodized oxide was destroyed. However, when the anodization voltage was less than 1 V, the anodization process was very stable and lasted much longer. Our results show that for a thin aluminum foil, unlike a thick plate, one requires small anodization voltage less than 1 V to form a porous aluminum oxide for long anodization time.
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박영옥,김은정,김현정,김영진,남순현 大韓小兒齒科學會 2004 대한소아치과학회지 Vol.31 No.3
쇄골두개 이형성증은 골격과 치아 이상을 동반하는 선천성 질환으로서 다수의 조직과 장기에 직접적인 영향을 주는 중배엽성 기능장애이다. 쇄골두개 이형성증에서 일반적인 골격 결함은 두개 봉합과 천문의 지연 폐쇄, wormian bone, clavicle aplasia가 나타날 수 있다. 또한 장골, 지골, 척추, 골반 등의 전체 골격 뿐 아니라 근육, 중앙 신경계 등에 영향을 줄 수 있다. 구강내 특징으로 유치의 만기잔존, 다수의 과잉치, 미맹출된 영구치, 낭 형성 등이 나타난다. 그러나 쇄골두개 이형성증 환아의 경우 정신적 및 신체적으로 특별한 이상을 나타내지 않아 스스로 질환을 인식하지 못하는 경우가 많으며 이의 결과 유치 탈락 후 영구치의 미맹출로 인하여 저작 및 심리적인 문제가 초래되는 경우가 많다. 따라서 쇄골두개 이형성증은 조기진단이 필요하며, 적절한 시기에 과잉치 제거 및 영구치 맹출을 유도하는 치료를 시행하여 저작기능의 회복 뿐 아니라 환자의 안모도 개선시킬 수 있어야 한다. Cleidocranial dysplasia(CCD) is a congenital disorder of skeletal and dental abnormality, which is mesodermal dysfunction influencing many tissues and organs. Skeletal abnormalities in CCD are delayed closure of cranial suture and fontanelle, presence of wormian bone and clavicle aplasia. And CCD has an effect on the long bones, phalanges, spine, pelvis, muscles, and central nervous system. Dental manifestations include retention of deciduous teeth, multiple supernumerary teeth and formation of cysts around nonerupted teeth. But as a result in common with a lack of medical and physical disability, patient may have no substantive complaint, there are many masticatory and psychological problem by absent eruption of permanent teeth after exfoliation of deciduous teeth. For this reason CCD is necessary fo early diagnosis and must be improvement of the patient's appearance as well as provision of a functioning masticatory mechanism by treatment of surgical removal of supernumerary teeth, followed orthodontically eruption of the natural permanent teeth at adequate time.
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