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      • KCI등재

        성견 일벽성 치주 결손부에 이식한 biphasic calcium phosphate의 조직계측학적 평가

        연제영,김동진,홍성배,홍지연,김성태,이용호,조규성,김종관,최성호,Yon, Je-Young,Kim, Dong-Jin,Hong, Sung-Bae,Hong, Ji-Yeon,Kim, Sung-Tae,Lee, Yong-Ho,Cho, Kyu-Sung,Kim, Chong-Kwan,Choi, Seong-Ho 대한치주과학회 2008 Journal of Periodontal & Implant Science Vol.38 No.2

        Purpose: The aim of this study was to evaluated biphasic calcium phosphate applied in surgically created 1-wall periodontal intrabony defects in dogs by histometrical analysis. Material and Method: Critical sized($4\;mm\;{\times}\;4\;mm$), one wall periodontal intrabony defects were surgically produced at the proximal aspect of mandibular premolars in either right and left jaw quadrants in four canines. The control group was treated with debridement alone, and experimental group was treated with debridement and biphasic calcium phosphate application. The healing processes were histologically and histometrically observed after 8 weeks. Results: In biphasic calcium phosphate group, more new bone and cementum formation, less epithelium and connective tissue attachment were observed compared to other groups. But there was no statistical significance. Conclusion: Though the statistically significant difference could not be found, it seemed that there was more new bone and cementum formation with applying biphasic calcium phosphate in 1 wall intrabony defects in dogs by preventing junctional epithelium migration.

      • KCI등재

        측방 접근법에 의한 상악동 거상술을 이용하여 식립된 골내 임플란트의 10년간 후향적 연구

        연제영,채경준,정의원,김창성,최성호,조규성,김종관,채중규,Yon, Je-Young,Chae, Gyung-Joon,Jung, Ui-Won,Kim, Chang-Sung,Choi, Seong-Ho,Cho, Kyoo-Sung,Kim, Chong-Kwan,Chai, Jung-Kiu 대한치주과학회 2007 Journal of Periodontal & Implant Science Vol.37 No.4

        Between 1997 May and 2007 May, One hundred and seventeen patients were treated. There were 129 cases of sinus elevation using a lateral window opening procedure and 258 implants placed simultaneously or delayed. The cumulative survival rate of the implants calculated. The implants were evaluated according to surgical site, quality and quantity of bone, graft material, membrane used, the length and diameter of the implant and complications. 1. The 10-year cumulative survival rate of the implants by sinus augmentation using lateral window approach was 96.90%. 2. There was no difference in the survival rate between the implant placed simultaneously with sinus elevation (one stage) and the procedure performed in the delayed procedure (two stage). 3. There was no difference in the survival rate according to the type and amount of graft materials. 4. There was no difference in the survival rate according to the implant site, bone quality and quantity. 5. There was no difference in the survival rate when the $CollaTape^{(R)}$ or Gore-Tex was placed in the window of the lateral wall. 6. There was no difference in the survival rate of the implant length and diameter. 7. The survival rate was as low as 75.00% when there were more than two complications. Implant placement with sinus augmentation using the lateral window approach is a predictable treatment method. Although the vertical height of residual ridge is insufficient and the quality of bone is poor, the normal survival rate of the implants would be expected if an appropriate graft material and membrane is used with greater effort to prevent complications.

      • KCI등재후보

        유화제의 HLB에 따른 O/W 및 W/S 에멀젼의 유화 안정성에 관한 연구

        연제영,신보람,김타곤,서정민,이청희,이상길,표형배 사단법인 대한화장품학회 2014 대한화장품학회지 Vol.40 No.3

        In this study, O/W and W/S emulsions were prepared by combining oils having different required hydrophilic lipophilic balance (HLB) values under the diverse conditions of HLB values composed of a hydrophilic surfactant and a lipophilic surfactant and their stability was investigated. Results showed that the higher the viscosity of O/W emulsions was as the lower the HLB value of emulsifier and emulsion particle showed a tendency to be a smaller and compact and stabler in centrifugal filtration. W/S emulsions also showed a similar tendency to be a smaller and compact as HLB values of emulsifier was higher and stabler in centrifugal filtration. However, the viscosity of W/S emulsion tended to get lower in HLB conditions of all emulsifiers as the time passed. This indicated that the emulsions had an unstable feature in long-term stability. In conclusion, the results showed opposite to the known theory that O/W emulsion is proper to be applied by nonionic surfactant with a high HLB value and W/S emulsion to be applied by nonionic surfactant with a low HLB value and provide useful information for the cosmetics research and related areas. 본 연구에서는 친수성 계면활성제와 친유성 계면활성제가 조합된 다양한 HLB (Hydrophilic Lipophilic Balance) 값을 갖는 유화 시스템의 조건에서, required HLB 값이 각기 다른 오일들을 적용하여 제조한 O/W 및 W/S 에멀젼들의 특성 및 유화 안정성을 조사해 보았다. 그 결과 O/W 에멀젼은 유화제의 HLB 값이 낮을수록 점도가 높고, 유화입자는 작고 조밀한 경향을 나타내었으며, 원심분리에서도 더 안정한 경향을 나타내었다. W/S에멀젼은 유화제의 HLB 값이 높을수록 유화입자는 작고 조밀해지는 경향을 나타내었으며, 원심분리에서도 더 안정한 경향을 나타내었다. 그러나 W/S 에멀젼은 시간이 경과할수록 모든 유화제의 HLB 조건에서 점도가 낮아지는 경향이 나타나 장기 안정도에서는 불안정한 특성을 나타내었다. 이번 연구의 결과는 O/W 에멀젼은 HLB 값이 높은 비이온 계면활성제의 적용이 적합하며 W/S 에멀젼은 HLB 값이 낮은 비이온 계면활성제의 적용이적합하다는 기본 이론과 상반되는 결과로서 앞으로의 화장품 연구 개발 시 유용한 연구 자료가 될 것으로 사료된다.

      • KCI등재

        콘크리트내에 표면매입 보강된 FRP의 내화성능 향상을 위한 내화단열재 열저항성능 평가

        연제영,서수연 한국구조물진단유지관리공학회 2014 한국구조물진단유지관리공학회 논문집 Vol.18 No.5

        This paper presents a fire exposure test result to evaluate fire resistance capacity of retrofit method using FRP (Fiber ReinforcedPolymer) in reinforcement concrete structure. Especially, this paper focused on near-surface-mounted retrofit method; FRP ismounted into the groove after making a groove in concrete. In the test, main parameters are retrofit method and materials for fireproofing. Spray type of perlite and board type of calcium silicate were considered as external fire proof on surface while particleof calcium silicate and polymer mortar as internal one in groove. By increasing the temperature of inside heating furnace, thetransfer of temperature from surface of fire proofing material to groove in specimen was measured. As a result, fire proofing using the board of calcium silicate was more effective to delay the heat transfer from outside thanspraying with perlite. It was found that the fire proofing could resist outside temperature of 820℃ at maximum to keep thetemperature of epoxy below glass transit temperature (GTT). 본 연구에서는 철근콘크리트 구조의 FRP를 이용한 보강에서 낮은 내화성능을 개선하기 위한 방안을 찾기 위하여, 보강된 FRP의 외부를 내화보강하는 방법에 대한 내화실험을 실시하였다. 특히 철근콘크리트 부재의 피복에 홈을 형성하여 FRP를 매입하는 보강 즉, NSM보강을 대상으로 하였다. 실험에서의 주요 변수는 보강방법과 사용 내화재료로서, Perlite계 재료를 표면에 분사하여 보강하는 방법,Calcium silicate계 보드로 표면에 부착하는 방법, 그리고 추가로 홈내부에 Polymer mortar 또는 Calcium silicate조각을 삽입하여 보강하는 방법으로 보강한 뒤 가열로 내부의 온도변화에 따른 열전달을 관찰하였다. 실험결과, Perlite계 내화뿜칠로 표면을 보강하는 경우보다 Calcium Silicate계 내화보드로 표면을 보강하는 방법이 효과적인 것으로 나타났다. 홈 내부의 에폭시가 유리전이온도에 도달할 때의 외부 표면온도 820℃까지 내화단열성능을 확보할 수 있는 것으로 나타났다.

      • KCI등재

        자외선 차단제품에서 자외선차단지수(SPF)와 자외선A차단등급(PA)에 영향을 주는 인자에 관한 연구

        연제영,서정민,배준태,이청희,이상길,표형배,홍진태,Yeon, Jae-Young,Seo, Jeong-Min,Bae, Jun-Tae,Lee, Cheong-Hee,Lee, Sang-Gil,Pyo, Hyeong-Bae,Hong, Jin-Tae 한국응용과학기술학회 2014 한국응용과학기술학회지 Vol.31 No.3

        본 연구에서는 자외선 차단제품에서 오일의 극성도, 에멀젼의 종류, 제품의 점도, 증점제의 종류 그리고 광안정제 등이 자외선 차단 효율에 미치는 영향을 조사해 보았다. 그 결과 오일의 극성도가 높으면 자외선 차단 효과는 높게 측정되었으며(Butyloctyl salicylate: SPF 44.10, PA 7.93), 반대로 오일의 극성도가 낮으면 자외선 차단 효과는 낮게 측정되었다(Dimethicone: SPF 16.40, PA 5.57). 에멀젼의 종류는 O/W 에멀젼보다 유기 자외선 차단제가 외상에 존재하는 W/O 에멀젼에서 자외선 차단 효율이 더 높게 측정되었다. 제품의 점도는 높아질수록 자외선 차단 효율이 비례적으로 상승하는 경향을 나타내었으며, 증점제의 종류 및 유화입자 크기는 자외선 차단 효과에 미치는 영향이 크지 않았다. 또한 광안정제의 함유 여부도 자외선 차단 효율에 영향을 미치는 중요한 인자 중의 하나로 나타났다. 이러한 결과들은 자외선 차단제의 추가적인 증량이 없어도 자외선 차단 효율을 더 높일 수 있음을 의미하는 것으로, 앞으로 자외선 차단제품 개발 시 경제적 효율성을 높이는데 큰 도움이 될 것으로 사료된다. In this study, we measured the effects of UV protection efficiency of the polarity of oil, the type of emulsion, the viscosity of product, the type of thickener and light stabilizer in sunscreen. As a result, even higher polarity of the oil, UV protection efficiency is measured high (Butyloctyl salicylate: SPF 44.10, PA 7.93). In case of low, it was measured low conversely (Dimethicone: SPF 16.40, PA 5.57). In case of emulsion types, UV protection efficiency of W/O emulsion which organic sunscreen agent is based in the outer phase is measured higher than O/W emulsion. According to increasing of viscosity, UV protection efficiency tends to increase proportionally. However, the size of emulsion particles and the kinds of thickener has no effect to UV protection efficiency. Also light stabilizer was found to be an important factor affecting the UV protection efficiency. As a result, it is able to improve UV protection efficiency and it has potential which improve the economical effect of the sunscreen without increasing sunscreen agents.

      • KCI등재후보

        후방통동맥류 결찰술 후 편측성 동안신경마비의 회복양상

        연제영,홍승철,김종수 대한신경외과학회 2004 Journal of Korean neurosurgical society Vol.35 No.2

        Objective : The most common cause of sudden unilateral oculomotor nerve palsy is aneurysms of the internal carotid-posterior communicating artery. But their post-operative clinical courses are not well known. The aim of this study is to evaluate clinical courses of oculomotor palsy after aneurysmal neck clipping and importance of early treatment. Methods : Ten patients who had unilateral oculomotor palsy and angiographically demonstrated internal carotidposterior communicating artery aneurysm are reviewed. All patients were women and their median age was 55 years. Five patients showed complete oculomotor palsy. All aneurysms were unruptured state and had narrow, long neck and their mean size was 7.8mm(5-10mm). Craniotomy and aneurysm clipping was performed emergently in all patients. Seven patients(group A) were operated within 8 days after the onset of oculomotor palsy and three patients(group B) were operated at 15, 25 and 35 days, respectively. Results : First noticeable change was improvement of ptosis(mean duration : >13.6 weeks) and followed by improvement of horizontal gaze(>19.4 weeks) and vertical gaze(>23.9 weeks). Recovery time for pupillary light reflex varied greatly(>14.2 weeks). Complete palsy usually took more time to recover when compared with incomplete palsy. Among group A patients 4 patients recovered completely(57%). In case of group B, 2 of 3(67%) patients recovered completely but their mean recovery time was longer than group A patients. Conclusion : Oculomotor palsy associated with internal carotid-posterior communicating artery aneurysms usually takes a long time to recover completely. Only the early surgical intervention would solve this problem.

      • KCI등재

        朝鮮時代 甘露幀畵 下段場面과 社會相의 相關性

        연제영 서울대학교 규장각한국학연구원 2010 한국문화 Vol.49 No.-

        Nectar Ritual Paintings are religious painting used in ceremonies for the dead. The paintings contain a depiction of Buddha in the upper part, and scenes related to the rituals in the middle. The lower part shows scenes of beings in the six paths of transmigration, focusing mainly on the human level. Especially the scenes in the lower part are subject to change over time, and reflect the society of the time they were made. By focusing on the specific features that appear in the lower part of the nectar ritual paintings, this paper studies the relationship between the contents of the paintings and the societal features of the Chosŏn Dynasty. In considering the changing meaning of scenes represented in the paintings, those paintings that have title captions have been retained as primary sources. However, in order to analyze phenomena related to the contents, paintings without title captions have been used as secondary source material. The relationship between the scenes in the lower part of the nectar ritual painting and society can be summarized as follows:First, it reflects the gruesome lives of those who lost their jobs and roamed around those who died because of starvation and diseases. Second, it reflects several phenomena related to the development of markets, such as evils such as burglary, fights and gambling. Third, it documents the itinerant entertainment groups that were prevalent in the late Chosŏn dynasty and shows their variety. Fourth, it shows conflicts between masters and servants, which arouse in a society where the status system still existed. Fifth, it contains images related to the criminal law system of the Chosŏn Dynasty. These elements clearly shows the correlation between the scenes in the lower part of the nectar ritual paintings and the society of the time. It is striking that the contents of the lower parts of the nectar paintings is so diverse that even elements that are not even found in the Yŏje (rituals for wandering ghost) appear here. For example, not only those who died alone without anyone looking after them, those without abode who died while wandering around, and those who died of starvation are depicted, but also shamans revered as divine women (Samu sinnyŏ), people selling divination signs, a blind fortuneteller couple, and several games such as diceplay and go. From the Buddhist perspective, these characteristics can be explained as an attempt to sympathize with the plight of the people and cure their suffering through the nectar paintings. Moreover, this aspect of Buddhism was a factor in the continuing survival and religious vitality of Buddhism at a time when Buddhism suffered from exclusion, suppression, and even the threat of extinction. Considering the characteristics of the nectar paintings, we would like to point to the necessity of creating a form of nectar painting to match modern society. In that case, shouldn't the lower part of the nectar ritual paintings depict the development from an agricultural to an industrial society, the ideological conflict among peoples, those who suffered for the development of democracy and those who died unjustly in accidents? This paper would like to contribute to the creation of a new, contemporary nectar ritual painting.

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