두부규격방사선사진에서 정상 sella turcica의 형태 및 크기에 관한 연구

최욱진,황의환,이상래 대한구강악안면방사선학회 2001 Imaging Science in Dentistry Vol.31 No.1

Purpose : To investigate the shape and size of normal sella turcica on cephalometric radiograms. Materials and Methods : Cephalometric radiograms of 200 orthodontic patients of age ranging 6-42 years were examined. All subjects were divided into 5 groups by age, the dimensional change of sella turcica was examined according to age, and the configurations of sella turcica floor, tuberculum sella, and anterior and posterior clinoid process were also observed. Results : The contours of sella turcica floor were flat type in 54% and concave type in 46%. The contours of tuberculum sella were right angle type in 55% and obtuse angle type in 44%; Acute angle type and plane type were very rare comprising 0.5%, 0.5% each. The configurations of anterior clinoid process were point type in 80% and round type In 20% of cases, and those of posterior clinoid processes were point type in 60% and round type in 40% of cases. The dimensional change of sella turcica according to age range had significantly positive linear trend to sella turcica length, height, and width until 25 years. After 26 years, no significant increase was found in sella turcica dimension. Especially, the sella turcica length had more proportional increase than that of sella turcica height and width. Conclusion : The results of this study revealed that the configuration of normal sella turcica was variable and the dimensional change of normal sella turcica had a linear tendency with age until 26 years.(Korean J Oral Maxillofac Radiol 2001;31:43-9)

상표를 통한 후발자 견제전략에 관한 연구

오환종,이상욱 군산대학교 지역개발연구소 1998 地域開發硏究 Vol.10 No.-

The first step into a new market is very attractive to a company although it involves many risk factors. This is due to the fact that there are many pioneer it has been believed, by the business circle and the academic circle, that the company is continuously on top when it comes to competition compared to follower companies. However on the contrary some studies show that market pioneers don't always have more advantage rather than followers. Pioneer is solve the problem. This study shows the brand strategy. Especially, brand extension strategy is very important. A major factor in brand extension is the cost of marketing. Therefore, pioneer must be consider the brand extension strategy to defense that follower's attack. Before setting about any practical extension, there are one preparatory stage.

약물의 in vitro 투과 실험을 위한 사람의 비강점막상피세포 단층막의 일차배양

유진욱,김유선,이민기,노환중,이치호,김대덕 한국약제학회 2002 Journal of Pharmaceutical Investigation Vol.32 No.1

The primary culture of human nasal epithelial cell monolayer was performed on a Transwell. The effect of various factors on the tight junction formation was observed in order to develop an in vitro experimental system for nasal transport studies. Human nasal epithelial cells, collected from human normal inferior turbinates, were plated onto diverse inserts. After 4 days, media of the apical surface was removed for air-liquid interface (ALI) culture. Morphological characteristics was observed by transmission electron microscopy (TEM). A polyester membrane of 0.4 μm pore size was determined as the most effective insert based on the change in the transepithelial electric resistance (TEER) value as well as the ^14C-mannitol transport study. The ALI method was effective in developing the tight junction as observed in the further increase in the TEER value and reduction in the permeability coefficient (P_app) of ^14C-mannitol transport. Results of the transport study of a model drug, budesonide, showed that the primary culture system developed in this study could be further developed and applied for in vitro nasal transport studies.

SCR制御의 單相, 並列 R-L回路의 定常狀態 解析

金煥溶,朴鍾旭 圓光大學校 1981 論文集 Vol.15 No.1

The currents and load voltage of a 2-branch resistance-Inductance parallel circuit controlled by an SCR pair in the supply line are deduced. while the SCRs are nonconducting, current decays exponentially around the load loop. The extinction angle is a transcendental function of the load impedances and the supply voltage. There is close agreement between measured and calculated results. The system cannot be analyzed in terms of a single-impedance eguivalent load.

12주간의 감각-운동 기능적 훈련이 중학교 수영선수의 체력, 스타트 및 경기기록에 미치는 영향

최종환, 이욱우 忠北大學校 平生體育硏究所 2014 平生體育硏究所 論文集 Vol.26 No.-

The purpose of this study was to investigate how much sensory-motor functional training had a positive effect on the physical fitness(power, muscular, muscular endurance, and flexibility), start, and swimming record of middle school swimmers as well as to provide first-line coaches. with training indicators of sensory-motor functional training. For this study, twenty subjects(n=20), middle school swimmers, were divided into two groups; sensory-motor functional training(SMFT) group(n=10) and circuit training(CT) group(n=10), and ten subjects in each group were trained for 12 weeks (3time/week, 90min/day). For data processing, two-way ANOVA was implemented to find out the change of physical fitness, and the difference of start and swimming record with respect to two groups SMFT and CT, and time interval for measurement-before and after training through using SPSS WIN ver 12.0 program. Besides, independent sample t-test as post test was carried out when the effect of interaction between them was appeared. The results of this study are like these; first, after 12-week training, physical fitness was improved in both SMFT and CT. Second, the SMFT group participants were improved much more than the ones in the CT group in power, strength of lower extremity of muscular strength, trunk flexion forward of flexibility, and start. Therefore, the result of this search shows that SMFT is more effective for middle school swimmers.

Shape Recognition에 의한 한글 Pattern Recognition

朴鍾旭,金煥溶 圓光大學校 1981 論文集 Vol.15 No.1

Korean Characters are formed into pattern groups composed of two or more consonant and vowel elemnts Thus this paper describe a technique for character recognition of 24-cononnant and vowel element of korean character(Han-guel) that does not require the thinning process. Our approach to shap description of Han-guel is a formal mode of a shape consisting of a set of primitive their properties. and their interrelationships. Index Terms-Decomposition, matching, shape description, shape recognition, tree search, syntactic recognition

Barbituric acid 개시계 레진의 치질 접착성에 미치는 가교제의 영향

나환욱,이은경,김교한,강인규 대한치과기재학회 2001 대한치과재료학회지 Vol.28 No.2

Degree of polymerization, surface hardness and tensile bond strength of the bonding resin were carried out to examine the effect of crosslinking agent, triethylene glycol dimethacrylate(TEGDMA), on the adhesion of barbituric acid-initiated resin to dentin. As the results, degree of conversion and surface hardness increased with increasing the concentration of TEGDMA. Tensile bond strength of the resin increased with increasing the concentration of TEGDMA up to 6 wt% and, thereafter, decreased.

하악과두에 발생된 골연골종의 증례보고

최욱진,황의환,이상래 대한구강악안면방사선학회 2000 Imaging Science in Dentistry Vol.30 No.2

The osteochondroma, also known as osteocartilagenous exostosis, is one of the most common benign tumors of the axial skeleton, but is rarely found in the facial bones. When present, the tumor is most often reported to affect the mandibular coronoid process. Osteochondroma of the mandibular condyle is extremely rare and may cause signs and symptoms like those seen in patients with temporomandibular joint dysfunction. Sometimes, differentiation between osteochondroma and condylar hyperplasia is not possible on histologic grounds alone, but the radiographic and intraoperative findings together are usually sufficient to establish a definite diagnosis, This report reviews the literature concerning osteochondroma, especially of the maxillofacial region, and describes a case of osteochon droma of the condyle. (Korean J Oral Maxillofac Radiol 2000; 30: 138-143)

Mg이 흡착된 Si(111)7×7 표면 재배열 구조

안기석,여환욱,이경원,이순보,박종윤 성균관대학교 기초과학연구소 1993 論文集 Vol.44 No.1

Si(111)7×7 위에 Mg을 흡착시켜 표면 구조의 변화를 RHEED(Reflection High Energy electron Diffraction)와 XPS(X-ray Photoelectron Spectroscopy)를 이용하여 연구하였다. RT∼200℃까지의 기판온도에서 증착량의 증가에 따라 표면구조는 7×7에서 diffused 1×1, 그리고 2√3/3×2√3/3-R30° 구조로 변화하였다. 이를 thermal annealing하여 3-Domain 3×1 구조를 관측하였고, 이 결과는 J. Quinn등의 결과와 일치함을 알 수 있다. 또한, 기판온도를 증가시킴에 따라 diffuse 1×1, Single domain 3×1구조(450℃)에 대하여 Mg(KLL)/Si(2p) peak intensity ratio를 증착량 증가에 따라 측정하여 각기 다른 온도에서의 Mg 흡착에 대한 mechanism을 제시하였다. Change of the Si(111)7×7 surface structure upon Mg adsorption was studied by RHEED(Reflection HI호 Energy Electron Diffraction) and XPS(X-ray Photoelectron Spectrocopy). The RHEED patterns of Si(111)7×7 were changed to the diffuse 1×1 and 2√3/3×2√3/3-R30° patterns with increasing the deposition times of Mg at RT. The diffuse 1×1, 3-domain, and single domain 3×1 structures appeared successively at the adsorption temperature of 300, 350 and 450℃, respectively. We could find the relative coverages of these structures by measuring Mg(KLL)/Si2p XPS intensity ratio.

항정신병 약물이 Cyclooxygenase-2 유전자 발현과 Prostaglandin E_2 농도에 미치는 영향

김종우,조성욱,범재명,윤도준,장환일,송지영 대한생물치료정신의학회 2001 생물치료정신의학 Vol.7 No.2

Objectives : Cyclooxygenase(COX) is the central enzyme in the biosynthetic pathway to prostaglandins from arachidonic acids. The action mechanism of nonsteroidal anti-inflammatory drugs is through inhibition of COX activity and prostanoid biosynthesis including prostaglandin E_2(PGE_2). The antipsychotic drugs are known having an analgesic effects, however its mechanisms of actions of action to pain control was not still clearly proved. In the present study, the effects of antipsychotic drugs(chlorpromazie and clozapine) on the production of PGE_2 and the expression of COX-2mRNA and protein in P815 cell line were studied. Methods : For that purpose, the methods of RT-PCR, western blot and prostagalndin E_2 enzymeimmunoassay were applied. Results : The results showed tha tin P815 cells treated with chlorpromazine, the level of COX2 mRNA was significantly decreased compared to the control cells. And total cellular PGE_2 levels were significantly decreased after treatment with chlorpromazine and clozapine. Conclusion : These results suggest that antipsychotic drugs have revealed their analgesic effect through the inhibition of COX-2 activity and PGE_2 production. And also, these results partly supports the excess theory of prostaglangdins in the pathogenesis of schizophrenia.