법랑아세포종의 임상병리학적 연구

성일용,류성호,신상훈,김욱규,김종렬,정인교,변기정 大韓顎顔面成形再建外科學會 2003 Maxillofacial Plastic Reconstructive Surgery Vol.25 No.1

The authors analyzed retrospectively the 60 patients with ameloblastoma who were treated at Department of Oral and Maxillofacial Surgery, Pusan National University Hospital from MArch, 1990 to December, 1995. The results obtained were as follows: There were 26 males (43.3%) and 34 females (56.7%). The peak age of patients was the third decade (41.7%). The majority of cases occurred in the mandible 93.3%, especially in the angle region (91.1%). Eighteen of 60 patients (30.0%) were associated with an impacted tooth, by impacted 3rd molar teeth (16.6%), molar (10.0%), and premolar and canine (3.4%) in order., Fifteen of 60 patients (25%) were associated with an odontogenic cyst, by dentigenous cyst(13.3%), odontogenic keratocyst(8.4%), and radicular cyst(3.3%) in order. Radiographically, there were 32 unilocular types(54.2%) with average age of 24.9±10.8 years, 14 multilocular types(23.7%) with average age of 35.7±17.7 and 13 mixed types(22.0%) with average age of 41.4±15.8. Histopathologically, there were 42 follicular types(70.0%) with average age of 33.7±15.1 years and 18 plexiform types(30.0%) with average age of 26±14.6. Conservertive treatment was performed in the 33 patients(55.0%) and their average age was 25.2±13.9 years and radical treatment in the 27 patients(45.0%) and their average age was 39.3±41.8. Overall recurrence rate was 10%. A consistent correlation between the age of the patient and the radiographic or histologic type of mandibular ameloblastoma was observed. There was a tendency for ameloblastomas of the follicular type to show a multilocular or mixed appearance and for those of the plexiform type to show a unilocular appearance.

아연계 탈황제의 장기연속 반응성 연구

박노국,이종욱,이승철,이종대,류시옥,이태진 영남대학교 공업기술연구소 2000 工業技術硏究所論文集 Vol.28 No.2

The zinc titanate sorbents(ZTG40) were prepared and the tests for durability and attrition resistance were carried out to develop the highly effective desulfurization sorbents. In the attrition tests for ZTG40 the results showed that the attrition resistance was 94.08% and that the sulfur capacity was maintained above 15g S/100g sorbent throughout the 100-cycle test, its maximum being 23.05g S/100g sorbent. As compared to sorbents developed by the developed countries, ZTG40 showed superior performances. In the advanced countries 15g S/100g sorbent is a yardstick of excellency for the sulfur capacity of desulfurization sorbents. Therefore, ZTG40 developed in this study has the desirable physical and chemical properties for fluidized desulfurization of coal gases.

2형 당뇨 환자에 있어서 C형 간염의 유병률에 관한 연구

김구영,서광섭,유광렬,임병욱,채선애,강남훈,김창훈,권영우,김희수,류성태,이정환,박성우,오웅식,김정한 중앙대학교 의과대학 의과학연구소 2003 中央醫大誌 Vol.28 No.1

Background: We have doubt about the truth that Type 2 DM is associated with chronic hepatitis C infection. The aim of our study was to prove a close relationship between chronic HCV infection and type 2 DM in korean patients. Methods: We reviewed the out-patient's medical records of 466 patients with type 2 DM who visit the Sung-ae hospital from March 2000 to August 2001. Diabetic patients were analyzed for the following variables: age, sex, waist circumference, weight, waist/hip ratio, using of self monitoring of blood glucose, method of therapy, duration of disease, experience of previous transfusion, major surgical procedure, accompanied disease, liver function tests (LFT), HbA1 c. We ruled out patients with liver cirrhosis. Results: Hepatitis C virus infection was observed more frequently in patient with Type 2 DM. Of 466 Type 2 DM patients, 13 patients were infected with Hepatitis C virus (2.79%). Compared with mean prevalence of Korean population (1.3~1.6%), it's value is very high. the other hand, 21 patients were infected with Hepatitis B virus (4.5%). Such results are similar to mean prevalence of the general public (4~5%). Conclusions: Prevalence of hepatitis C was closely associated in korean patients with type 2 DM. And an increased prevalence is independent of cirrhosis.

Experimental study on the direct contact condensation of steam jet in the passive safety injection tank

Ryu, Sung Uk,Jeon, Byong Guk,Kim, Seok,Kim, Jaemin,Euh, Dong-Jin Atomic Energy Society of Japan 2018 Journal of nuclear science and technology Vol.55 No.1

Herniated Discs at the Cervicothoracic Junction

Ryu, Dal-Sung,Paik, Ho-Kyu,Ahn, Sang-Soak,Kim, Kyung-Hyun,Chin, Dong-Kyu,Kim, Keun-Su,Cho, Yong-Eun,Kuh, Sung-Uk Elsevier 2018 World neurosurgery Vol.118 No.-

<P><B>Background</B></P> <P>Disc herniations at the cervicothoracic junction (C7–T1 level) are unusual, and there have only been a few studies of patients with herniated C7–T1 discs. In addition, previous studies did not focus on the mechanism and causes of solitary cervicothoracic junction disc herniation. The authors investigated the characteristics, symptom duration, clinical course, and biomechanics of cervicothoracic junction disc herniation by comparing patients with C7–T1 disc herniation (C7–T1 group) with control groups.</P> <P><B>Methods</B></P> <P>Thirty-six patients who underwent solitary C7–T1 single-level disc surgery between 2006 and 2015 were included. For radiographic comparison, patients in a herniated C5–C6 disc group and the healthy control group were cohort matched.</P> <P><B>Results</B></P> <P>In the C7–T1 group, the disc herniation mainly occurred in the foraminal space (<I>P</I> < 0.0001). The C7–T1 group was significantly associated with a history of trauma (<I>P</I> < 0.0001). In addition, the cervical vertebral body was more readily observed on plain lateral radiographs in the C7–T1 group (7.36 ± 0.068). Patients in the C5–C6 group tended to have the sternal notch more frequently located above the T2–T3 disc space than other groups (<I>P</I> = 0.014).</P> <P><B>Conclusions</B></P> <P>C7–T1 disc herniation demonstrates unique characteristics. Understanding the features of disc herniation at the cervicothoracic junction would be helpful for optimal care.</P> <P><B>Highlights</B></P> <P> <UL> <LI> C7–T1 disc herniation demonstrates unique characteristic aspects that contrast with the other disc herniations. </LI> <LI> C7–T1 disc herniation mainly occurs in the foraminal space (<I>P</I> < 0.0001). </LI> <LI> The C7–T1 group was significantly associated with a history of trauma (<I>P</I> < 0.0001). </LI> <LI> The cervical vertebral body was more readily observed on plain lateral radiograph in the C7–T1 group (7.36 ± 0.068). </LI> </UL> </P>

Preliminary Investigation on Spread-Splash Criterion of an Electrically Charged Droplet

( Sung Uk Ryu ),( Sang Yong Lee ) 한국액체미립화학회 2006 한국액체미립화학회 학술강연회 논문집 Vol.2006 No.-

A study on the lift-off diameter of bubbles generated on horizontal tube

Ryu, Sung Uk,Kim, Seok,Euh, Dong-Jin Elsevier 2018 Annals of nuclear energy Vol.111 No.-

<P><B>Abstract</B></P> <P>In this study, experiments and a theoretical analysis on the lift-off diameter of bubbles generated on a horizontal tube were conducted. A force balance analysis in the direction normal to the heated surface at the moment of the bubble lift-off was performed to develop the model. According to the developed model, the bubble lift-off diameter strongly depends on the azimuthal position of the horizontal tube, the relative velocity between a bubble and the surrounding liquid, and the properties of the bubble and liquid. To validate the prediction performance of the proposed model, the dynamics of the bubble growth and sliding process was visualized using a high-speed digital video camera. The proposed model agrees well with the experimental data within an averaged relative deviation of 19.6%.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A theoretical correlation for the bubble lift-off diameter on a horizontal tube. </LI> <LI> Growth and lift-off phenomena of bubbles generated on a horizontal tube. </LI> <LI> Bubble lift-off diameter depends on the azimuthal position of the horizontal tube. </LI> </UL> </P>

Does minimally invasive fusion technique influence surgical outcomes in isthmic spondylolisthesis?

Ryu, Dal-Sung,Ahn, Sang-Soak,Kim, Kyung-Hyun,Park, Jeong-Yoon,Kuh, Sung-Uk,Chin, Dong-Kyu,Kim, Keun-Su,Cho, Yong-Eun 0 2019 MINIMALLY INVASIVE THERAPY AND ALLIED TECHNOLOGIES Vol.28 No.1

열수력 종합효과 시험장치를 이용한 SMART(일체형 원자로)의 소형파단사고 모의에 대한 실험적 연구

류성욱(Sung Uk Ryu),배황(Hwang Bae),유효봉(Hyo Bong Ryu),김우식(Woo Shik Kim),신용철(Yong-Cheol Shin),이성재(Sung-Jae Yi),박현식(Hyun-Sik Park) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11

The experimental study on the thermal-hydraulic characteristics of passive safety injection systems (PSISs) was conducted using the SMART-ITL (System-Integrated Modular Advanced ReacTor-Integral Test Loop) facility which was constructed by KAERI. The objective of this study is to investigate the effects of the flow rate of PSISs on the small-break loss-of-coolant accident (SBLOCA) scenario of the safety injection system (SIS) line break. The steady-state condition was maintained for 600 seconds before the break. When the major parameters were compared between the target value and test result, most of the thermal-hydraulic parameters agree well with each other. The water level of reactor pressure vessel (RPV) was maintained higher than that of a fuel assembly plate during the transient for the present CMT (Core Makeup Tank) and SIT (Safety Injection Tank) flow rates condition. It can be seen that the capability of an emergency core cooling system is sufficient with the PSISs of SMART during the transient.

An Experimental Investigation of Core Makeup Tank Behavior using SMART-ITL during Small Break Loss-of-Coolant Accident

Hyobong Ryu(유효봉),Byong-Guk Jeon(전병국),Hwang Bae(배황),Sung-Uk Ryu(류성욱),Sun-Joon Byun(변선준),Sung-Jae Yi(이성재),Hyun-Sik Park(박현식) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11

An integral type reactor, SMART (System-integrated Modular Advanced ReacTor) has been recently equipped with an additional passive safety system, which maintains the reactor in a safe condition during the design basis accident without any AC power to drive the safety injection pumps and operator action. For verification of the SMART passive safety system, a single train of a passive safety system consisting of a core makeup tank (CMT), a safety injection tank (SIT), and two stages of an automatic depressurization system (ADS) were additionally attached to the existing SMART-ITL (Integral Test Loop for SMART) facility. In this paper, we describe the test procedure and test result of a SBLOCA simulation to evaluate the performance of the CMT, which has a flow distributor in the upper part. The test was carried out according to the sequence of events (SOE) for an SBLOCA scenario. Most of the thermal-hydraulic properties of the CMT, such as the pressure, temperature, injection flow rate, and water level were obtained during the test with the operation of the passive safety system. We conducted experiments using two types of CMT, which have the same volume but different aspect ratio, called CMT #1-1 and CMT #1-2 for a better understanding of the shape effect. Characteristic properties such as the pressure, thermal stratification, and injection behavior were studied and compared.