지혈적 치수 절단술의 효과에 관한 조직학적 연구

김종여,김종수,김용기,최장규 大韓小兒齒科學會 1998 大韓小兒齒科學會誌 Vol.25 No.1

The efficacy of several polpotomy methods were svaluated histologically on animal model using 6 beagles. At 1, 4, 6 weeks after pulpotomy, animals were sacreficed by perfusion method. Histomorphometric analysis was performed using computerized image analyzing system. Statistical comparisons were done using SPSS program. The following results were obtained: 1. Tissue responses after ferric sulfate treatment mainly consisted of fibrous ourface layer with the underneath pulpal tissue layer containing well-preserved odontoblasts. 2. Bleeding, fibrosis and necrosis are the main reactions obsereved in electrosurgical pulpotomy and the normal pulpal tissues were limited to the apical portion. 3. In the aspect of preserving the normal pulpal tissue, ferric sulfate pulpotomy was evaluated to be superior to formocresol or electrosurgical pulpotomy.

내구성을 고려한 표면피복재의 성능평가에 관한 실험적 연구

김영덕,조봉석,윤종기,김용로,장종호,김무한 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2

It is recognized that reinforcement corrosion is the main distress behind the present concern regarding concrete durability. The basic method to prevent reinforcement corrosion is coating the reinforcement concrete with surface coating materials but evaluating their performance is necessary to the work satisfactory because they have different performance for each other. In this study. to evaluate performance of surface coating materials, we compare their properties in terms of sticking strength and permeability of carbonation, chloride ion and water with actual reinforcement corrosion under environment of complex deterioration. The results showed that an increase in age also decreases Carbonation velocity coefficients, increases Chloride ion diffusion coefficients and increases water absorption coefficients. As well, an increase in age also increases corrosion of reinforcement due to permeability of carbonation and chloride ion. And sticking strength of inorganic coating material is higher than organic coating material.

數種의 弗素製材에 의해 前處置 再植 齒牙의 祖織學的 反應에 關한 硏究

金鐘秀,金殷淑,金鐘好,金容琦 大韓小兒齒科學會 1997 大韓小兒齒科學會誌 Vol.24 No.2

The effect of fluoride pretreatment upon root resorption after delayed replantation was studied in beagle dogs. Upper and lower incisors were extracted and bench dried for 45minutes. 1% Stannous Fluoride solution, 2% neutral sodium fluoride gel and 1.23% acidulated phosphate fluoride gel were used for the pre-treatment of replanted root surface in the experimental groups. Replantation was done with no treatment in control group. After of an experimental periods 3 weeks, animals were sacrificed by perfusion followed by sample preparation. A histomorphometric method was applied for evaluation of tissue reactions observed in each group under light microscope. Scanning electron microscopic observation was done to find out any different surface topography between groups. The results were as follows: 1. Fluoride-treated groups showed in general the better healing patterns than untreated control group. 2. Comparisons between three experimental groups revealed the superiority of APF-treated group over the other groups in terms of tissue healing reaction by showing the highest frequency in uncomplicated healing pattern and surface resorption and the lowest in inflammatory resorption, but with no statistical significance(p>.05) 3. Scanning elecron micrographs showed the irregular distribution of resorption cavitie s and the attached bone of variable size and shape in all groups. 4. It can be conclued that the types of fluoride did not have significant impact on the early tissue reactions after delayed replantation under the condition of the present experiment.

Lip Bumper를 이용한 치료의 성공과 실패

김용기,김종수,김종빈,맹명호 大韓小兒齒科學會 1999 大韓小兒齒科學會誌 Vol.26 No.3

혼합치열기의 소아환자의 경미한 하악 전치부의 총생을 해결하는 문제와 하악 제 2 유구치의 조기 상실로 인한 하악 제 1 대구치의 근심경사 그리고 이에 따른 제 2 소구치의 맹출 공간 부족등을 해소하기 위한 여러가지의 방법들이 시도되어왔지만 저마다 그 술식의 적용범위나 방법 등에는 많은 어려움 들이 있어왔다. 이 연구의 목적은 이런 선택이 어려움을 가만하여 실제 임상에서 보다 간편하고 환자의 불편감을 줄여줄 수 있는 한 방법으로 Lip bumper를 이용한 술식을 소개하고 그 적용례를 통하여 성공과 실패 사례들을 소개함으로써 임상가들에게 보다 유익한 정보를 주기 위함이다. In the mixed dentition,many chidren have mild crowing of anterior dentition on the mandibular arch and mesial of mandibular molar.Lip bumper have been used to gain arch length for the alignment of mild to moderate crowded dental arches.As such,they may provide an alternative to extraction therapy.The claimed therapeutic effect of the lip bumper is bodily forward incisor movement,flaring of the low incisors,and distal tipping of the molar.The dental changes can be attributed to removal of lip pressure on the lower anterior dentition and the distal forces exerted at the molar at the abutment.The purpose of this study is to show more easily method of treatment for mild anterior crowding of mandible.

DIFOTI 영상 최적화를 위한 광량에 대한 연구

김종빈,김종수,유승훈,김용기 大韓小兒齒科學會 2010 大韓小兒齒科學會誌 Vol.37 No.1

기존 DIFOTI 시스템의 문제점 중 디지털 영상 처리의 개선을 위하여 light emitting diode(LED)를 광원으로 사용하여 prototype DIFOTI 시스템을 개발하였다. 효율적이고 우수한 화질을 제공 할 수 있는 광량을 산출하기 위해 1일부터 20일까지 유치 법랑질을 Carbopol 907 인공 우식 용액을 사용하여 탈회시키고 실험 기간에 따른 법랑질 탈회 정도를 기존의 DIFOTI 시스템과 영상 분석을 통해 비교 평가하였으며, 탈회 정도에 대한 gold standard로 사용된 편광 현미경 소견과 비교하여 다음과 같은 결론을 얻었다. 1. 탈회 기간에 따라 두 시스템 모두 탈회 법랑질의 광도가 감소하는 양상을 보였다. 2. 정상 및 탈회 법랑질간의 광도의 차이는 DIFOTI 시스템이 prototype DIFOTI 시스템보다 더 큰 값을 보였다. 3. 편광현미경 관찰 소견과 비교해 볼 때, DIFOTI 시스템은 병소 깊이와 매우 유사한 변화 양상을 보여준 반면, prototype DIFOTI 시스템은 병소 깊이의 변화를 충분히 반영하지 못하였다. 보다 우수한 영상을 얻기 위해서는 광량의 최적화 과정과 함께 디지털 카메라의 조리개 조절도 병행되어야 할 것으로 판단되며, 이러한 단점은 소프트웨어적인 보완을 통해 개선될 수 있을 것으로 사료된다. This study was performed to compare the quality of image processing between the newly developed prototype using light emitting diode(LED) and the conventional DIFOTI system(EOS Inc., USA). To estimate the optimal light emitting power for the improved images, primary enamel surfaces treated under Carbopol 907 de-mineralizing solution were taken daily during 20 days of experimental periods by both DIFOTI systems. The results of comparative analyses on the images obtained from both systems with polarized image as gold standard can be summarized as follows: 1. Trans-illumination indices of images taken from primary enamel surfaces were decreased with time in both systems. 2. The differences of intensity of luminance between sound and de-mineralized enamel surface in prototype DIFOTI system was shown to be relatively smaller than conventional DIFOTI system. 3. From the comparative analysis of images from both DIFOTI system with polarized images as gold standard, the difference between sound and de-mineralized enamel surface of intensity of luminance of DIFOTI system was more correlated to polarized images than prototype of DIFOTI system. With the optimal LED emitting power, the control of aperture of digital camera is considered as the another key factor to improve the DIFOTI images. For the best image quality and analysis, the development of the improved image processing software is required.

遲延再植 時 齒根處理에 따른 齒周組織의 治癒에 關한 硏究

김종여,김종수,김용기,임성수 大韓小兒齒科學會 1998 大韓小兒齒科學會誌 Vol.25 No.1

The purpose of this study was to analyze comparatively the effect of various root pretreatments prior to delayed replantation. Total 6 beagle dogs were used for the experiment and 8 teeth per each animal were treated by several prepared regimens before replantation. After 3 & 6 weeks of experimental periods, animals were sacrificed by perfusion method. The results obtained form the present study can be summarized as follows: 1. All root pretreatment regimen used in this experiment showed effectiveness in the periodontal repair of delayed replanted teeth. 2. The teeth treated by the regimen of stannous fluoride combined with tetracycline revealed more favorable tissue response and less frepuent root resorption or ankylosis than other groups. 3. The long term effect of Group Ⅳ-regimen seems to be worth further study since the result at 6-weeks showed the significant progress in periodontal healing when compared to 3-week result which was not indicated in any other group.

한국 정신장애의 역학 조사 연구[I] : 각 정신장애의 유병률

조맹제,함봉진,김장규,박강규,정은기,서동우,김선욱,조성진,이준영,홍진표,최용성,박종익,이동우,이기철,배재남,신정호,정인원,박종한,배안,이충경 大韓神經精神醫學會 2004 신경정신의학 Vol.43 No.4

Objectives : This study aims to estimate the prevalence of the DSM-IV psychiatric disorders in Korean population using the Korean version of Composite International Diagnostic Interview (K-CIDI). Methods : Subjects were selected by taking multi-stage, cluster samples of 7,867 adult household residents, 18 to 64 years of age, in ten catchment areas. Total 78 trained interviewers administered the K-CIDI to the selected respondents, from June 1 to November30,2001. Results : Total 6,275 respondents completed the interview. Some 33.5% of respondents reported at least one lifetime disorder, 20.6% reported at least one-year disorder, and 16.7% reported at least one-month disorder. The most common lifetime disorders were alcohol abuse/dependence (17.24%), nicotine dependence/withdrawal (11.19%), specific phobia (5.16%), and major de-pressive disorder (4.25%). The lifetime prevalence of substance abuse/dependence (0.25%) and schizophrenia (0.16%) was very low. Nicotine and alcohol use disorder showed very high male/female ratio. Mood disorder and anxiety disorder were more prevalent among female than male. Conclusion : The prevalence of psychiatric disorders was high. In comparison with other studies, remarkable differences in distributions of psychiatric disorders across the areas and times were observed.

超高層 아파트의 火災 安全 對策에 關한 硏究

金鍾培,李東基 대구산업정보대학 1995 논문집 Vol.9 No.2

As high-rise buildings increase rapidly, the importance of fire prevention grows. Hower, the present methods for fire prevention usually trend to meet the minimum requirements based on the existing laws and regulations. The only requirement in the law for fire prevention in these high buildings is that sprinkler system should be made in the buildings 16-stories high and over. The reliable measures to escape from a fire in the buildings 16-stories high and over should be considered and the measures which are more reliable and intensive than in the existing high apartment houses are desired because fire fighting activities are restricted due to the difficulty in reaching the high buildings and negative factors.

방울토마토와 오이의 선도유지를 위한 포장용 플라스틱 필름 선발

김종기,황병호,이정용 中央大學校 食糧資源硏究所 2003 食糧資源硏究所 論文集 Vol.15 No.1

방울토마토와 반백다다기오이의 유통기간 중 상품성유지를 위한 MAP용 필름을 선발하고자 시중에 사용되는 식품용 포장필름 10종을 공시하여 수확한 과실을 밀봉하여 상온에서 저장하면서 품질을 비교하였다. 방울토마토의 포장용 필름중에서 OPP는 과실색상의 발현을 억제하였지만, 당도 및 과실 경도가 감소가 두드러지게 나타났고, PE계 필름은 당도 및 경도 면에서는 우수하였지만, 착색이 상대적 빠르게 진행되었다. 방울토마토의 유통기간을 연장하기 위해서는 PP계 필름이 우수하나, 맛 등의 품질유지 측면에서는 PE계 필름이 상대적으로 우수하였다. 유통중인 오이의 과피의 황화 및 중량 감소를 억제하고 과실의 경도를 유지하기 위한 MAP용 필름으로는 CPP나 PP가 가장 우수한 것으로 나타났으며, 25°C 상온하에서 2주간 상품성이 유지되었다. In an effort to select a optimum plastic film for modified atmosphere packaging (MAP), cherry tomato and cucumber fruit were harvested at commercially ripe stage and packaged with 10 different kind of films. At the end of storage at 25 C, quality of fruits were examined. Development of red pigment of cherry tomato was significantly delayed in fruit packaged with an oriented polypropylene(OPP) film compared to control fruit. However, firmness and sweetness of fruit treated with OPP was inferior to fruit stored in air. Fruit kept in polyethylene(PE) film exhibited better quality in firmness and sweetness, however, fruit color changed faster than the other films. Cucumber fruit packaged with a casted polypropylene(CPP) and OPP showed a best quality in keeping freshness, tissue firmness and skin color among films tested, maintaining marketability for two weeks at 25 C. The data suggests that it is of importance to use an optimum film for applying a MAP to different type of fruit.

Chloral Hydrate를 이용한 직장투여 진정요법의 임상적 연구보고

김용기,박희승,김종수 大韓小兒齒科學會 1990 大韓小兒齒科學會誌 Vol.17 No.2

The purpose of this study was to evaluate overall clinical effect of conscious sedation performed by chloral hydrate adminstered through rectum. Patients with uncontrollable behavior were treated under sedation and treatment effect was evaluated using 5 rating scales modified by Lunt and recorded by operator subjectively. Very effective and effective cases were 35 out of 86 cases revealing 40.7% of success rate. Treatment effect of high dosage groups(75mg/Kg) was shown to be superior to low dosage groups(mg/Kg), but with no statistically significant differences between them. Vital signs were recorded to be relatively stable throughout procedure and no remarkable side effect was checked except a few cases of mild vomitting and dry mouth.