http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 김성오(Seong O Kim) (검색결과 134 건)
- 무료
- 기관 내 무료
- 유료
-
Second Order Model for Free Surface Convection
김성오(Seong-O Kim) 한국전산유체공학회 1997 한국전산유체공학회지 Vol.2 No.2
VOF 방법에 의한 자유표면 유동계산의 정확성을 개선하기 위해 이차정도 모델을 개발하였다. 개발된 이차원 모델의 정확성을 비교하기 위하여 여러 가지 크기의 원형 및 Solitary wave 형상의 자유표면 유동을 통하여 기존에 개발된 두 가지의 일차정도 모델과 비교하였다. 비교결과 반경이 큰 원과 같이 곡률이 작은 형상의 경우에는 일차정도 모델도 비교적 정확한 결과를 보여주고 있으나 작은 반정의 원형이나 Solitary wave 와 같이 곡률이 큰 형상의 경우 일차정도 모델은 많은 오차를 보여주는 반면에 이차정도 모델은 어느 경우에나 매우 정확한 결과를 보여준다.
-
-
Second Order Model for Free Surface Convection
김성오(Seong-O Kim) 한국전산유체공학회 1997 한국전산유체공학회지 Vol.2 No.2
VOF 방법에 의한 자유표면 유동계산의 정확성을 개선하기 위해 이차정도 모델을 개발하였다. 개발된 이차원 모델의 정확성을 비교하기 위하여 여러 가지 크기의 원형 및 Solitary wave 형상의 자유표면 유동을 통하여 기존에 개발된 두 가지의 일차정도 모델과 비교하였다. 비교결과 반경이 큰 원과 같이 곡률이 작은 형상의 경우에는 일차정도 모델도 비교적 정확한 결과를 보여주고 있으나 작은 반정의 원형이나 Solitary wave 와 같이 곡률이 큰 형상의 경우 일차정도 모델은 많은 오차를 보여주는 반면에 이차정도 모델은 어느 경우에나 매우 정확한 결과를 보여준다.
-
-
김성오(Seong-O Kim),어재혁(Jae-Hyuk Eoh),최훈기(Hoon-Ki Choi) 한국전산유체공학회 2002 한국전산유체공학회지 Vol.7 No.3
An analytic methodology was developed for free surface motions between liquid metal coolant and cover gas in order to calculate the phenomena of gas entrainment in hot pool surface through IHX EMF and reactor core. The methodology was setup by applying the first order VOF convection model to CFX4 general purpose fluid dynamics analysis code. The methodology was validated by applying it to an experimental apparatus designed for free surface motions of KALIMER reactor. The distributions of free surface calculated by the present methodology were almost coincident with the experimental data. The developed methodology was applied to the KALIMER reactor of full power operating condition. The shapes of the free surface were nearly uniform. From the results, it was found that the altitude of the free surface from the IHX inlet nozzle of KALIMER reactor is high enough not to affect to free surface motions of generating gas bubbles from the turbulent shear flows such as hydraulic jump and water falls.
-
-
Second Order method for Free Surface Convectiona
김성오(Seong-O. Kim) 한국전산유체공학회 1997 한국전산유체공학회 학술대회논문집 Vol.1997 No.-
To improve the numerical analysis of free surface convection and its reconstruction, a second-order algorithm was developed based on the volume of fraction method. The second-order method is compared with the first-order methods through the simulation of the convection for various sizes circles and solitary waves. For the small curvature of a free surface, e. g. circles with a large diameter, the first order method such as the FLAIR's and the centered slope method, show relatively good predictions. However, for large curvature configurations, the first order methods show large distortion of free surface. On the contrary, the second-order model always shows powerful prediction capabilities of free surface convection.
-
치아의 견인을 위한 버튼 접착시 오염이 인장강동에 미치는 영향
김성오,최병재,이제호,손흥규,Kim, Seong-Oh,Choi, Byung-Jai,Lee, Jae-Ho,Sohn, Heung-Kyu 대한소아치과학회 1998 大韓小兒齒科學會誌 Vol.25 No.2
We already know that it is very difficult to obtain an "isolated field" for direct bonding during the surgical exposure of unerupted teeth. The aim of this in-vitro study is to simulate the clinical situation of forced eruption and to evaluate the tensile strengths of preligatured button with several types of contamination which can happen during the surgical exposure of unerupted teeth. Four orthodontic direct bonding systems were used. ($Ortho-One^{TM}$, $Rely-a-Bond^{(R)}$, $Ortho-Two^{TM}$, Phase $II^{(R)}$) Each material was divided into four groups(n=20) : Group 1. (Control, no contamination), Group 2. (Rinse etching agent with saline instead of water), Group 3. (Blood contamination of etched surface for 30 seconds), Group 4. (Blood contamination of primed surface for 30 seconds) 320 bovine anterior permanent teeth were divided into the above mentioned 16 groups. Enamel surface was flattened and ground under water coolant. Pre-ligatured buttons were prepared to the same form. (Cut 0.25 ligature wire 10 cm in length. Twist the ligature wire 30 times clockwise. Mark the wire 15mm and 35mm points from button. Make a loop sticking two points together and twist the loop 6 times counterclockwise.) The bonded specimens were stored at $37^{\circ}C$ saline solution for 3 days. Then the tensile strength of each sample was measured with Instron universal testing machine, crosshead speed of 0.5mm/min. The following results were obtained: 1. As compared to control groups (Group 1) of each material, Rely-a-Bond had a significantly lower mean tensile strengths than other material. (p<0.01) 2. In Group 2. of Ortho-One and Rely-a-Bond, the mean tensile strengths decreased about 7.7% and 11.1%, respectively with statistical significances. (p<0.05) 3. In Group 2. of Ortho-Two and Phase II, the mean tensile strengths did not decrease. 4. In Group 3. of Ortho-One, Rely-a-Bond, Ortho-Two, and Phase II, the mean tensile strengths decreased about 60.8%, 56.1%, 60.2%, and 46.0%, respectively with statistical significances. (p<0.01) 5. In Group 4. of Ortho-One and Rely-a-Bond, the mean tensile strengths did not decrease. 6. In Group 4. of Ortho-Two and Phase II, the mean tensile strengths were decreased about 20.95% and 22.28%, respectively with statistical significances. (p<0.01) There were formations of a hump shaped mass from bonding resin under blood contamination which disturbed direct bonding procedure. According to Reynolds, the proper bond strength for clinical manipulation should be at least 45N or about 4.5Kg.F. According to these results, it can be concluded that Ortho-One could be used during surgical exposure of unerupted teeth. In any case, blood contamination of the etched surface should be avoided, but the blood contamination of primed surface of Ortho-One may not decrease bond strength. Just 'blowing-out' is enough to remove blood from primed surface of Ortho-One. You can verify the clean surface of the primer of Ortho-One after blowing out the blood contamination.
-
얼굴의 수직성장을 이용하여 III급 부정교합을 치료하는 구강내 가철식 장치의 치료기간분석
송지혜,김성오,송제선,이제호,최형준,Song, Jihyeo,Kim, Seong-Oh,Song, Je Seon,Lee, Jaeho,Choi, Hyung-jun 대한소아치과학회 2019 大韓小兒齒科學會誌 Vol.46 No.2
Vertical facial growth triggers the rotation of mandible to move the chin point to the downward and backward direction, which showed remarkably effective result making the less prominent chin. Recently, the intraoral removable appliance utilizing class III elastic demonstrated the vertical growth trigger mechanism. The treatment change was very fast and wearing was quite easy, compared to extraoral appliances. The purpose of this study was to verify the duration of the treatment on class III malocclusion using intraoral removable appliances, which designed to accelerate vertical facial growth. 56 patients were selected with the complaint of the protruded mandible and class III malocclusion (overjet : -3 - 0 mm, overbite : 0 - 4 mm). Information like; age at start, duration of the treatment events, type of the treatment, overjet, overbite etc. was collected and calculated. The average age of the patients delivering the initial brace was $8.75{\pm}1.10year$. Most of the anterior crossbite was resolved within 6 months. The total treatment period was $21.79{\pm}10.73months$ with the additional procedures like the alignment of anterior teeth and torque control using additional removable and fixed orthodontic appliances. The correlation study showed that patient's cooperation (p = 0.000) and the use of fixed appliance (p = 0.032) were significantly influenced on treatment duration. 본 연구의 목적은 혼합치열기 초기에 III급 부정교합을 보이는 어린이에서 수직성장을 유도하는 III급 고무줄을 걸 수있도록 고안된 구강내 가철식장치를 사용하여 반대교합을 치료시, 그 구체적인 치료기간을 알아보고, 이에 영향을 주는 변수를 확인하는 것이다. 본 소아치과에 III급 부정교합을 주소로 내원하여 구강내 가철식 장치로 치료를 완료한 56명의 환자를 대상으로 치료개시 연령, 치료기간 및 치료유형, 수평피개량, 수직피개량 등의 자료를 수집하였다. 환자군의 교정개시 연령은 8.75세이었고, 교합이 넘어갈때까지 3.31개월, 이후 정상 피개까지 1.90개월이 소요되어, 대부분이 개시 6개월 이내에 개선되었다. 전체 치료기간은 21.79개월이었고 환자의 협조도(p = 0.000)와 고정식 교정장치의 여부(p = 0.032)가 치료기간에 유의하게 영향을 주었다. 결론적으로 본 연구의 가철식장치는 수년간 장시간 장착하며 악정형력을 주는 구강외 장치에 비해서 그 치료기간이 6개월 이내로 짧으며, 혼합치열기 III급 부정교합 어린이에서 효과적으로 이용할 수 있다.
-
한윤범,김성오,이제호,최형준,손흥규,최병재,Han, Yoon-Beum,Kim, Seong-Oh,Lee, Jae-Ho,Choi, Hyung-Jun,Sohn, Hyung-Kyu,Choi, Byung-Jai 대한소아치과학회 2009 大韓小兒齒科學會誌 Vol.36 No.1
Tooth impaction refers to situations where a tooth fails to erupt due to mechanical blocking and remains unerupted beyond the normal time of eruption. It is commonly found in permanent dentition, but rarely in deciduous dentition. Tooth impaction is caused by systemic or local factors, and most common etiology is odontoma. Odontoma is also commonly found in permanent dentition, and rarely in deciduous dentition. We are presenting case of 4 year and 4 month year old girl, who had impacted and disto-angulated lower left deciduous second molar due to odontoma. We removed odontoma and performed orthodontic traction of impacted lower left deciduous second molar. Then, the impacted primary molar was erupted and acceptable occlusion was obtained. 치아매복이란 물리적인 장벽으로 치아맹출에 장애가 발생하는 것으로, 정상 맹출 시기까지 치아가 맹출하지 못하는 상태를 말하며, 영구치열기에서 주로 관찰되고, 유치열기에서는 드물다. 치아매복은 전신적 그리고 국소적인 요인에 의하여 일어나고, 치아종에 의한 매복이 자주 발생하는 것으로 보고되었으며, 치아종에 의한 매복 또한 대부분 영구치열기에 나타나고, 유치열기에서는 드물게 발생한다. 이 증례는 하악 좌측 제2유구치의 맹출지연을 주소로 내원한 4세 4개월 된 여아에서, 임상 및 방사선학적 검사 결과 매복된 하악 좌측 제2유구치와 제1대구치 교합면 상방에서 치아종을 관찰할 수 있었으며, 하악 좌측 제2유구치는 치아종에 의해 하악 제1대구치 방향으로 원심경사 되어 있었다. 이에 저자들은 치아종을 제거한 후 매복된 하악 좌측 제2유구치를 교정적으로 견인하고 맹출을 유도하여, 양호한 교합 관계를 얻었기에 이를 보고하는 바이다.
ScienceON연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
