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저강도 초음파 조사시 MC3T3-E1 세포의 활성에 미치는 영향
최유성,이상철,Choi, You-Sung,Lee, Sang-Chull 대한구강악안면외과학회 2001 대한구강악안면외과학회지 Vol.27 No.2
This study was performed to observe the effect of ultrasound(1.0MHz, $0.75W/cm^2\;and\;1.0W/cm^2$) irradiation on cultured MC3T3-E1 cell, osteoblastic like cell with respect to the proliferation, protein synthesis, and alkaline phosphatase activity of the cells. The results were as follows: 1. The proliferation of MC3T3-E1 cells was increased on ultrasound irradiated group compared with control group. 2. The protein synthesis was not apparently increased on ultrasound irradiated group compared with control group. 3. The alkaline phosphatase activity level was not apparently increased on ultrasound irradiated group compared with control group. From the above results and other literatures, we could suggest that the ultrasound with the appropriate intensity and frequency may have important roles in stimulation of cell proliferation. Therefore the ultrasound may be used in the acceleration of the bone regeneration and bone fracture healing.
원전 습분분리재열기 튜브 번들 교체를 위한 열전달 고찰
최유성,최광희,이상국,Choi, You-Sung,Choi, Kwang-Hee,Lee, Sang-Guk 한국압력기기공학회 2010 한국압력기기공학회 논문집 Vol.6 No.1
The plugging rate of reheater tubes of Wolsung unit 1 nuclear power plant has been increased by corrosion and erosion since 1990. As the dimensions of the new first stage reheater bundle tubes which were supplied by Hanjung company to replace were different from old one, numerical calculations are carried out for flow and heat transfer in the reheater bundle tubes of the N.P.P. Numerical calculations consists of thermal performance, drain line pressure drop, flow change by pressure drop of line, stress analysis of finned tubes and analysis of flow induced vibration. Computational analysis using heat transfer research institute program is adopted to verify the results of the numerical calculations. It contains the evalution of performance in the system with view to location of the new reheater bundle and it shows the differences between the numerical calculation results and heat transfer research institute program output.
최유성(You-Sung Choi),지유진(Yu-Jin Jee),송현철(Hyun-Chul Song) 대한구강악안면외과학회 2004 대한구강악안면외과학회지 Vol.30 No.6
The displacement of an entire tooth into the adjacent anatomical area is an uncommon complication of a tooth extraction. We encountered a 23-year-old woman who had previously undergone surgery under local anesthesia to remove the lower third molar about 12 weeks prior and the upper third molar was extracted 2 days prior to visiting this hospital. Upon admission, she complained of a swallowing discomfort and a mouth opening limitation. Panoramic radiograph and a CT scan revealed a displacement of the entire tooth into the lateral pharyngeal space. The tooth was retrieved via the transoral approach under general anesthesia. The removed tooth had an indentation formed by a dental bur. Therefore, it was concluded that the tooth displaced into the lateral pharyngeal space was the lower third molar. This report describes an unusual case of a third molar that was displaced into the lateral pharyngeal space with a review of the relevant literature.
악관절 내장증 환자의 하악지 수직골절단술후 초기 악관절 증상의 변화에 대한 연구
최유성(You Sung Choi),김성곤(Seong Gon Kim) 대한구강악안면외과학회 1999 대한구강악안면외과학회지 Vol.25 No.2
TMJ internal derangement has been treated by the conservative methods and the surgical methods according to the clinical state. There are several surgical methods for treatment of TMJ internal derangement, such as disk repositioning and repair, diskectomy with and without grafts, articular surface contouring, high condylectomy, condylotomy, and arthroscopic surgery etc. Especially, it has been reported that the condylotomy produced the increase of the joint space, the pain relief, the elimination of the joint dysfunction due to the antero-inferiorly movement of the condyle, and the condylar morphologic change resulted from the progressive remodeling in TMJ without the surgical intervention within the TMJ. We have performed EVRO(extraoral vertical ramus osteotomy) to the 5 patients diagnosed as ADDWR(Anterior disk displacement with reduction) from June 1997 to December 1997 in the Chin-Hae military hospital. We diagnosed them with MRI and clinical examination. And we compared the preoperative symptoms with postoperative 2 months symptoms. They were compared by Helkimo index, mandibular mobility index, and pain scale. Anamnestic Index(Ai) was changed from 20 preoperatively to 1.2 postoperatively, clinical dysfunction score from 11.8 to 2.8, and Clinical Dysfunction Index(Di) from 2.8 to 1 2. The pain scale of the affected side was changed from 4.4 to 2.6 and that of the nonaffeted side from 2.2 to 2.6. The maximal mouth opening was changed from 35.2㎜ to 40.9㎜, right lateral excursion from 7.8㎜ to 8.0㎜, left from 8.8㎜ to 7.0㎜, and protrusion from 6.2㎜ to 6.2㎜. In these results, we could not expect any excellent improvement of the clinical symptoms during the immediate postoperative periods. But we could observe the disappearance of the joint noise and the improvement of the clinical dysfunction score. On the basis of the results of the previous investigations about condylotomy effect which presented the condyle position were changed antero-inferiorly in the articular fossa during the immediate postoperative period, the displaced condyles may prevent wide mouth opening. Therefore it is elucidated that the improvement of the maximal mouth opening and other functions were restricted during the immediate postoperative periods. After long term follow-up period, the symptomatic and functional improvement will be expected by the passive repositioning of the proximal segment. We report the preliminary results with the related references.
팬과 플랫폼 내부 구조물 간의 거리에 따른 강제대류냉각 전자장비의 열적 안정성
최유성(You-Sung Choi),김창성(Chang-Sung Kim),강성욱(Sung-Wook Kang),최혜윤(Hye-Yoon Choi),김수진(Su-Jin Kim) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12
The operating conditions of the electronic equipment vary depending on mounting environment due to the limited internal space in the platform. The present paper investigated the effect of the distance between the fan and the internal structure in the platform(D<SUB>fs</SUB>) on thermal stability of the forced convective cooling electronic equipment. Four conditions were considered. One of them was without any internal structure. The others were in the Dfs range of 10.0-50.0mm. In order to analyze the stability of fan operation, the fan performance curve and the system impedance curve were used. Temperature of each module was considered for the thermal stability. As the D<SUB>fs</SUB> increased, the fan operation became stable and the heat dissipation effect became improved. It was necessary to secure the distance at least 30.0mm for the stable fan operation.
아토피피부염의 중증도에 따른 임상 및 검사실 소견에 관한 연구
최유성 ( Yu Sung Choi ),유충의 ( Chung Eui You ),박미연 ( Mi Youn Park ),손숙자 ( Sook Ja Son ),황규왕 ( Kyu Uang Whang ) 대한피부과학회 2006 대한피부과학회지 Vol.44 No.7
Background: Although atopic dermatitis (AD) is a very common disease, there is no specific diagnostic or prognostic marker for it. Minor clinical features and a few laboratory findings can be used as ancillary diagnostic criteria and reflect the present state of AD, but cannot predict the disease severity. Objective: We performed this study to find out if there is any correlation among minor clinical features, laboratory findings such as blood eosinophil count and serum IgE levels, and the severity of AD. Methods: One hundred patients with AD were involved in the study. They were divided into two groups by the age of 12 years; group 1(≤12-year-old, n=47) represented childhood AD and group 2 (≥12-year-old, n=53) represented adolescence and adult AD. Subsequently, the severity of AD was assessed by the SCORAD index, and then all the patients were classified into 3 subgroups; mild, moderate and severe groups. They were evaluated for 28 minor clinical features of AD. In addition, blood samples were measured for blood eosinophil count and serum IgE levels. Results: The pattern of minor clinical features correlated significantly with the disease severity was quite different between the two groups, except ventral wrist eczema and eyelid eczema. Blood eosinophil count and serum IgE levels increased significantly as the SCORAD index increased. While perifollicular accentuation was a significant minor clinical feature that correlated with blood eosinophil count in the both groups, there were no minor features showing statistically significant correlation with serum IgE levels. In group 1, keratosis pilaris and infragluteal eczema appeared more frequently as all 3 variables such as the SCORAD index, blood eosinophil count and serum IgE levels, increased simultaneously. However, no minor clinical features which correlated significantly with all variables were observed in group 2. Conclusion: We concluded that minor clinical features such as keratosis pilaris and infragluteal eczema reflect the disease severity and can be used as an anticipating sign of severe disease, especially in childhood AD. (Korean J Dermatol 2006;44(7):824~829)
개재골 이식술을 이용한 만성재발성 악관절 탈구의 외과적 처치
김성곤,최유성,Kim, Seong-Gon,Choi, You-Sung 대한악안면성형재건외과학회 1999 Maxillofacial Plastic Reconstructive Surgery Vol.21 No.2
Chronic recurrent TMJ dislocation results in difficulty of mastication, speaking, and swallowing due to the limitation of the mandibular movement. Etiologic factors are considered as the looseness of the capsule and ligaments, the decrease of the articular eminence, condylar morphologic change, muscular disharmony near by TMJ, and the decrease of the vertical length of the mandibular ramus. Treatment approach has been suggested that surgical methods are selected for the correction of the etiologic factors when conservative treatments are not effective. Many surgical methods have been reported such as eminectomy, eminence augmentation, condylotomy, and zygomatic arch down fracture technique. We performed the eminence augmentation through interpositional bone graft in chronic recurrent TMJ dislocation. This method leads to favorable postoperative result without recurrence and complication, so we report the case with related references.