정중과잉치로 인해 회전된 상악 중절치의 치험례

이범의,김영재,김정욱,장기택,이상훈,김종철,한세현 大韓小兒齒科學會 2004 大韓小兒齒科學會誌 Vol.31 No.4

정중과잉치의 원인은 잘 알려지지는 않았지만 dental lamina의 hyperactivity에 의해 발생한다는 가설이 가장 많이 받아들여지고 있다. 이러한 정중과잉치의 병발증으로는 주변 영구절치의 맹출 장애, 만곡 치근, 치근흡수, primordial 혹은 follicular cyst의 형성, 회전, 이환된 부위의 총생 및 비정상적인 정중이개를 일으킬 수 있다. 이러한 이유로 영구전치의 회전이 야기되면 보통 공간의 부족은 적거나 없으며 재발이 흔하므로 과개선이 요구된다. 재발의 방지를 위해서는 조기치료, 과개선, 긴 보정기간, 적절한 접촉면의 형성, 짝힘의 사용, 그리고 수술적인 방법 등이 제안되어왔다. 이에 저자는 정중과잉치로 인하여 심하게 회전된 상악중절치를 주소로 내원한 환아에서 교정적, 외과적 술식을 이용하여 양호한 결과를 얻은 두 증례를 보고하는 바이다. The etiology of mesiodens is unknown but the most widely accepted theory is the hyperactivity of the dental lamina. Complications of mesiodens are delayed or prevented eruption of maxillary central incisors, displacement or rotation of permanent teeth, crowding of affected region, abnormal diastema or permanent space closure, dilaceration or abnormal root development of permanent teeth, primordial or follicular cyst formation, root resorption of adjacent teeth, eruption into nasal cavity. If mesiodens rotate the maxillary central incisors, space deficiency is not common and relapse is very common. So overcorrection is needed. To prevert the rotational relapse, early treatment, overcorrection, long retention period, properly formed proximal surface, use of coupled force, and surgical techniques have been suggested. The authors present two cases, whose chief complain were severely rotated maxillary incisors by mesiodens, treated by orthodontic and surgical technique and showed good results.

행정개혁과 저항 : Evaluations on the Activities of the Presiential Commission for Administrative Reform 행정쇄신위원회의 3년간 활동을 중심으로

이종범 高麗大學校 行政問題硏究所 1996 行政과 政策 Vol.- No.2

昭陽댐의 取水口 水深調節에 따른 放流水溫變化 시뮤레이션

이종범 江原大學校 附設 環境硏究所 1989 環境硏究 Vol.6 No.-

Since the Soyang multi-purpose dam was designed to discharge deep lake water to downstream area, the microclimatic changes in this area, such as relatively cold water during summer season and frequent fog formation during winter season, has been arised. The intake of surface water, instead of deep lake water, would mitigate such changes. In order to compare the microclimatic aspects caused by both cases, the temperatures of dischange water were simulated utilizing the Water Quality for Fiver and Reservoir System(WQRRS) model. From the simulation results, the followings are concludel: The discharge water temperature for the case of the surface water intake would increase upto 10C during summer. This will mitigate the cold thermal impact on downstream ecosystems. The sidcharge water temperature for the case of the surface water ntake would decrease about 2 C during winter. This will mitigate fog and cloud formation in the downstream area. The surface water intake would would reduce the evaporation on the surface of the Lake Soyang especially during summer. This will mitigate the fog formation on the lake. The results suggest that the surface water intake would be desirable to mitigate the microclimatic changes in the downstream area.

中部地方 客地의 大氣汚染潛在力에 관한 硏究

李鍾範 江原大學校 附設 環境硏究所 1991 環境硏究 Vol.8 No.-

Air pollution potentials of the 7 cities in the central part of Korea were obtained with the mean wind speed within the mixed layer and the mixed layer height calculated by the Jump Model. Seasonal variation of the afternoon mixed layer height in Seoul area shows that low in winter and high in summer. Annual mean of the morning air pollution potential was lowest in Incheon and highest in Wonju. On the other hand annual mean of the afternoon air pollution potential was lowest in Incheon and highest in Chuncheon. Relatively low air pollution potential in Incheon can be explained as high mixed layer height and the effect of sea breeze.

Pasquill 安定度階級의 評價와 安定度 Parameter 推定方法의 開發

李鍾範,金龍國 江原大學校 附設 環境硏究所 1990 環境硏究 Vol.7 No.-

Pasquill stability class (PSC) was evaluated with Monin-Obukhov length (L) using the data observed at a height of 213m meteorological tower in Tsukuba, Japan. PSC was determined with wind speed and insolation (net radiation at night), and L was calculated with the heat flux and the friction velocity obtained at 25 m by the eddy correlation method. To evaluate PSC with L, for every class of Pasquill stability(from A to F class), percentiles and median of L were used. Results show that for every class of Pasquill stability, L varies so widely that PSC does not adequately represent the atmospheric stability conditions. The scheme which estimates L using air temperature at two levels and wind speed at single level was developed. Comparison between estimated L by the scheme and observed L reveals that the scheme is better than PSC. Furthermore, the scheme is more advantage than PSC because it uses air temperature at two levels instead of insolation shich is more difficult to observe in the ifeld than air temperature.

大氣汚染濃度의 發生顔度特徵및 推定法의 評價

이종범,강인구 江原大學校 附設 環境硏究所 1989 環境硏究 Vol.6 No.-

The aspects of the occurence frequency of SO_(2) concentration were studied with the observed data in Seoul and the scheme that is capable of estimating not only highest concentration for a variety of averaging times but also concentrations for arbitary occurrence frequency with long term arithmatic mean and geometric standard deviation data, was evaluated. The results of the statistical analysis show that the occurrence frequency is almost log normal except a few cases, and 3rd highest values of daily mean concentration were about 4.2∼5.2times higher than annual arithmatic mean. The evaluation with the observed hourly concentration shjows that the scheme fairly well estimate the short term concentration of arbitary occurrence frequence and it can be used for air quality management and environmental impact assessment.

댐건설에 따른 국지기후의 변화실태

이종범,봉종헌,조하만 江原大學校 附設 環境硏究所 1990 環境硏究 Vol.7 No.-

Local climatic change due to the artificial lakes formed by dams was studied for 5 areas in Korea. At the lake side station there were remarkable increase of frequency of fog and decreases of sunshine du-ration and summertime air temperature. At the down stream area of dam. for frequency was increased while sunshine duration was decreased as those at the lake side. Analysis of hourly solar radiation and cloud amount data shows that at Chunchon. amount of solar radiation is less and cloud amount is more than those at the iniand areas in the morning time in autumn. The reason for these considered to be due to the evaporation from the relatively warm water surface discharged from the Lake soyang in autumn.

소양호의 수온 垂直分布에 관한 熱收支的 硏究

이종범 江原大學校 附設 環境硏究所 1989 環境硏究 Vol.6 No.-

호수의 수온 수직분포는 WQRRS모델에 의ㅣ하여 계산되지만 오차가 크므로 WQRRS모델의 수온 수직분포 계산의 정확도를 향상시키기 위하여 수표면의 열수지 산출방법 및 열 확산계수 산정방법을 개선하였다. 열수지 산출방법은 接水氣層에서의 flux-profile relationship을 이용하고 氣層을 bulk 的으로 취급하였으며 열 확산계수에는 풍속에 의한 확산 水層의 安定度에 의한 확산을 함께 고려하였다. 이와 같이 개선한 WQRRS모델에 의한 수온계산 결과를 소양호의 水溫實測資料로서 평가한 결과 기존 WQRRS모델에 비하여 현저히 향상되었다. 수온 실측자료와 개선되 WQRRS모델에 의하여 소양호의 열수지를 조사한 결과는 다음과 같다. 1)수온이 상승하는시기는 표층에서 3월경, 수심 30m 에서는 4월 경이며 하가하는 시기는 표층에서 8월경, 수심 30m에서는 9월경이다. 2) 호수면에서의 순복사랑은 3월에서 10월까지는 양이며 11월에서 2월까지는 음이다. 3) 증발잠열은 춘계와 하계에 작고 추계와 동계에 크며 연간 증발량은 822mm이다. 3) 연 평균 Bowen ratio는 0.31로서 호수의 냉각에는 현열보다 잠열이 크게 기여한다. The heat budget was studied in a deep warm monomictic reservoir, Lake Soyang, and the water temperature profiles were simulated by a lake ecosystem model, WQRRS. The original WQRRS that employs heat budget muthod for the temperature simulation was modified in this study in order to in corporate the concept of flux-profile relationship and the bulk method at the surface boundary layer. The WQRRS modified in this study proved to simulate temperature profiles better than the original model from the verification with 4 years'observations of temperature profile in Lake Soyang. The net radiations were positive from March to October. However, cooling started in September due to large sensible and latent heat flux.

서울지역의 광화학 오염농도 추정을 위한 중희귀 모델 개발

이선기,이종범 江原大學校 附設 環境硏究所 1991 環境硏究 Vol.8 No.-

The purpose of the study is to develop a multiple regression model for photochemical pollutants in Seoul. Date on daily maximum ozone concentrations measured at 10 air quality monitoring stations in Seoul in case of easterly wind case and westerly wind case were analyzed using principal components analysis. Three orthogonal factors representing ozone area distribution characteristics of each group for wind case were derived using the statistical package, SPSS. These factors accounted for over two-thirds of the distributions at 10 stations. The analysis confirmed that ozone distributions are similar among stations within defined geographical area and depended on wind directions. A stepwise multiple regression procedure was employed to develop the best fit equation relating maximum afternoon ozone concentration to meteorological and pollutant factors. The resulting correlation coefficients for each group were 0.69, 0.58, 0.46 for all wind case, 0.81, 0.85. 0.76 for easterly wind case and 0.78, 0.67, 0.47 for westerly wind case. The multiple regression model could be a potentially useful tool for air pollution forecasters in predicting daily maximum ozone concentrations for each group in Seoul.

정규기상관측자료를 이용한 주간의 현열 플럭스 추정

이종범,김용국,박철용 한국환경과학회 2000 한국환경과학회지 Vol.9 No.2

The purpose of the present study is to develope the estimation scheme for sensible heat flux by semi-empirical approach using routine meteorological data such as solar radiation and air temperature. To compare observed sensible heat flux with estimated sensible heat flux, the sensible heat fluxes were measured by three dimensional sonic anemometer-thermometer. The field observation was performed during 1 year from December 1, 1995 to November 30, 1996 on a rice paddy field in Chunchon basin. The heat fluxes were measured at a heights of 5m and mean meteorological variables were obtained at two levels, 2.5m(or 1.5m) and 10m. Since condition of rice paddy field such as, wetness of the field, roughness length, vary widely, we devided annual data to 5 periods. Comparing with two sensible heat fluxes, the results showed that the correlation coefficients were more than 0.86. Thus, we can conclude that the estimation method of sensible heat fluxes using routine meteorological data is practical and reliable enough.