The prediction of the tooth size in the mixed dentition for Korean

Moon, Sung-Hwan,Kim, Seong-Oh,Yu, Hyung-Seong,Choi, Byung-Jai,Choi, Hyung-Jun,Lee, Jae-Ho 大韓小兒齒科學會 2006 大韓小兒齒科學會誌 Vol.33 No.2

이번 연구의 목적은 혼합치열기 아동에서 미맹출된 견치와 소구치의 크기를 예측하는데 있어서 한국인에 맞는 방정식을 만들기 위함이다. 미맹출 치아의 크기를 예측하는 것은 혼합치열기 교정 진단과 치료계획 수립에 있어서 매우 중요하다. 미맹출된 견치와 소구치 크기를 예측하는 방법은 몇가지가 있지만 그중에서도 가장 흔하게 쓰이는 것이 모이어의 예측표와 다나카와 존스턴의 방정식이 있다. 하지만 그것들은 백인을 위해서 제작된 것이고 치아 크기는 인종에 따라서 다르다고 알려져 있다. 이번 연구에서는 치아크기를 측정하여 하악 영구 절치의 크기 합과 견치 및 소구치의 크기 합 사이의 상관관계를 구하고 회귀방정식을 이용해서 한국인에 맞는 예측표를 만들었다. 연세대학교 치과대학에 재학중인 178명의 한국 학생(남 108명, 여 70명, 평균연령 21.63)을 대상으로 실험하였다. 영구치의 근원심 폭경을 석고모형상에서 calipers를 이용해서 측정하였다. 성별간의 치아 크기는 차이가 있었다(p<0.05). Correlation coefficient는 0.57에서 0.64의 범위였고, standard errors of the estimates 는 여성에서 0.6으로써 남성보다 우수하였다. r^(2)값은 0.27에서 0.41의 범위를 나타내었다. Estimating the size of unerupted teeth is an essential aspect of orthodontic diagnosis and treatment planning in the mixed dentition. Several methods were introduced and used for the prediction. The most common methods among these would be Moyers probability chart and Tanaka and Johnston equations. These are currently used widely, but they were developed for Caucasians. Because there are clear racial differences in teeth size, the objectives of this study were to produce correlation coefficients between the combined mesiodistal widths of the permanent mandibular incisors and those of the canines and premolars for each quadrant, and prediction tables with regression equations, specifically for Korean. 178 young adults (70 women, 108 men, mean age 21.63 years) were selected from the College of Dentistry, Yonsei University, Seoul, Korea. The mesiodistal crown diameters of the permanent teeth were measured with calipers. Significant sexual dimorphism was found in tooth sizes. The correlation coefficients between the total mesiodistal width of the mandibular permanent incisors and those of the maxillary and mandibular canines and premolars were found to be between 0.52 and 0.64. The standard error of the estimatation was better (0.60) for women and the r^(2) values ranged from 0.27 to 0.41 for both sexes, Prediction tables were prepared for Korean. This study showed larger canine and premolar diameters than Tanaka and Johnston's and Moyers' studies which might be due to the racial differences. Further investigations with a larger sample size will be needed for more representative data on the Korean population.

치과진료실에서 황색 포도구균의 감염유형 분석

문상은,이동근,권경환,김강주 大韓顎顔面成形再建外科學會 2003 Maxillofacial Plastic Reconstructive Surgery Vol.25 No.1

To investigate the cross contamination in the dental clinic, Staphylococcus aureus, the pathogen in acute pyogenic infection and one of the important microbes causing nosocomial infection, was isolated from the mouth and anterior nare of healthy personnel and patients and the air in the dental clinic. The patterns of antibiotic susceptibility of the isolated staphylococci were examined. mecA gene from the MRSA was detected by polymerase chain reaction (PCR). The isolation rate of S. aureus in the dental clinic was the highest in the mouth of dentists (29.4%) and the lowest in the air of the dental clinic (1.3%). In the study of PCR, MRSA and some methicillin susceptible staphylococci had mecA positive gene. These results suggest that staphylococci in the dental environment might be one of the important causes of nosocomial infection in the dental clinic.

Crawford Ⅲ형과 Ⅳ형 흉복부 대동맥류 4예 보고

문성민,손민수,이길연,이상목,고석환,홍성화,윤충,오수명,박호철 대한혈관외과학회 2003 Vascular Specialist International Vol.19 No.2

우리나라 일별 강수발생의 확률과 주기성의 특성

문승의,김백조,하창환 한국환경과학회 1997 한국환경과학회지 Vol.6 No.2

The characteristics on the transtion probabilities and periodicity for the daily precipitation occurrence in Korean peninsula are investigated by applying the Markov chain properties to daily precipitation occurrence. In order to examine the responses of Markov Chain properties to the applied period and their magnitudes, three cases (Case A: 1956∼1985 at 14 stations, Case B: 1965∼1994 at 14 stations, and Case C: 1985∼1994 at 63 stations) are considered in this study. The transition probabilities from wet day to wet day for all cases are about 0.50 and in summer, especially July, are higher. In addition, considering them in each station we can find that they are the highest at Ullung-do and lowest at Inchon for all cases. The annual equilibrium probabilities of a wet day appear 0.31 in Case A, 0.30 Case B, and 0.29 Case C, respectively. This may explain that as the data-period used becomes shorter, the higher the equilibrium probability is. The seasonal distributions of equilibrium probabilities are appeared the lowest(0.23∼0.28) in winter and the highest(more than 0.39) in spring and monthly in July and in October, repectively. The annual mean wet duration for all cases is 2.04 days in Case A, 1.99 Case B, and 1.89 Case C, repectively. The weather cycle obtained from the annual mean wet and dry duration is 6.54∼6.59 days, which are closely associated with the movement of synoptic systems. And the statistical tests show that the transitions of daily precipitation occurrence for all cases may have two-state first Markov chain property, being the stationarity in time and heterogeneity in space.

적응 Simplex-Mesh 기술에 기반한 3차원 물체 복원과 자료압축

문성환,강훈,조용군 중앙대학교 생산공학연구소 1999 생산공학연구소 논문집 Vol.8 No.1

대부분의 3차원 물체 복원 기술은 물체를 다수의 평면으로 나누어 물체의 표면을 근사시켜 표현한다. 주어진 분류치를 사용하여 mesh를 초기화시키는 Marching Cubes 알고리듬과 Delaunay Tetrahedrisation이 널리 사용되고 있다. 이와 더불어 deformable 모델은 적은 수의 가정만으로도 다양한 종류의 데이터들에 대한 복원 및 재구성을 할 수 있기 때문에 일반적인 물체 복원에 적합하다. 본 논문에서는 곡면으로 이루어진 물체에 대해서 적응 simplex mesh 기술을 기반으로 3차원 물체를 압축 복원하는 방법을 제시한다. 이 방법은 미리 정해진 mesh 구조를 변형시키고 곡률과 같은 기하학적인 특성들을 다시 설정하면서 본래의 3차원 물체로 접근시킨다. 시뮬레이션을 통해서 높은 압축률로 물체를 복원하고, 물체의 모양을 최적으로 기술하기 위해 정점들이 곡률이 높은 곳으로 집중되는 것을 보인다. Most of the 3D object reconstruction techniques divide the object into multiplane and approximate the surfaces of the object. The Marching Cubes Algorithm which initializes the mesh structure using a given isovalue, and Delaunay Tetrahedrisation are widely used. Deformable models are well-suited for general object reconstruction because they make little assumptions about the shape to recover and they can reconstruct objects from various types of datasets. In this paper, we propose a novel method for reconstruction of 3D objects. This method, for a 3D object composed of curved planes, compresses the 3D object based on the adaptive simplex-mesh technique. It changes the pre-defined mesh structure, so that it may approach to the original object. Also, we redefine the geometric characteristics such as curvatures. As results of simulations, we show reconstruction of the original object with high compression and concentration of vertices towards parts of high curvature in order to optimize the shape description.

회전근 개 파열 관절중에서 시행한 역구형 관절 치환술 : 2례 보고

문영래,이상홍,노경환 朝鮮大學校 附設 醫學硏究所 2009 The Medical Journal of Chosun University Vol.34 No.1

Microfiber직물의 염색성 개선을 위한 분산 및 산성염료의 염색법 연구

文昇玉,柳德桓 啓明大學校 生活科學硏究所 1995 科學論集 Vol.21 No.-

This study was performed to determine the optimum condition for dyeing to improve dye-ability of polyester/nylon split microfibers. The samples were dyed with disperse and acid dyes, varying time, temperature, washing method, and heat-set condition and then dye-ability and color fastness of the samples were evaluated. The results were as follows: (1) There was no tendency of types of disperse dyes on the stain to nylon side, but azo-type dyes had the samples stain more than anthraquinone-type dyes had. (2) It was found that the acid-reduction washing was effective method for washing in terms of dye ability and color fastness. (3) The optimum conditions of temperature and time were 120℃ and 30min. for polyester-side and 70℃ and 30min. for nylon-side. (4) It could be obtained that the lowest variation of apparent color strength of the samples when the heat-set condition was 170℃-180℃ for 25sec. of which condition was lower than traditional polyester.

우리나라 사고다발지점 선정방법의 문제점 및 개선대안

성낙문,이환승 한국안전교육학회 2002 한국안전교육학회지 Vol.5 No.2

In conducting traffic safety programs, it is very important to identify hazardous sites in appropriate manner. Many experts in the traffic safety fields have performed researches to choose hazardous sites. The method of identifying hazardous sites which prevails in Korea is based on the traffic crash frequencies, which is inevitable because of insufficient database associated with the traffic crash data. This paper analyzed problem related to the method based on accident frequencies, and established an alternative which is named as frequency-quality control method, to make up for the weak points in the current method. As a result of test, the proposed method was reliable enough to be applied in the traffic safety program.

액체막법에 의한 중금속이온의 분리 및 회수

曺文換,丁學鎭,이상인,金振浩,金始中 江原大學校 附設 環境硏究所 1994 環境硏究 Vol.11 No.-

거대고리 리간드는 금속이온과 선택적으로 결합하는데, 이를 이용하여 에멀젼 액체막을 통한 금속이온의 이동에 관하여 연구를 수행하였다. 금속이온은 유기층에 있는 운반체에 의하여 source phase에서 receiving phase으로 이동한다. 운반체로는 거대고리 리간드인 DBN_(3)O_(3)를 사용하였다. 여기에서 에멀젼 액체막을 통한 금속이온의 이동에 관한 요인과 어떤 금속이온의 선택적 분리에 관하여 검토하였다. 금속이온과 거대고리 리간드 그리고 금속이온과 receiving phase내에 있는 음이온에 대한 안정도 상수를 금속이온의 선택적 이동에 대한 척도로 조사하였다. 납이온이 혼합 용액에서 다른 금속이온보다 높은 이동속도를 나타내었다. Receiving phase내의 음이온이 금속이온의 이동에 중요한 역할을 한다. Receiving phase내에 있는 NO_(3)^(-)을 S_(2)O_(3)^(2-) 대치하면 이동량이 증가함을 보였는데 이는 Pb^(2-)-S_(2)O_(3)^(2-) 상호작용이 Pb^(2+)-NO_(3)^(-) 상호작용보다 크기 때문이다. Macrocyclic ligand has been know to selectively bind with metal ions so that ability applied for the transport of metal ions across the emulsion liquid membrane in this study. The metal ions are transproted from the source phase to the receiving phase by the carrier of the organic phase. Several factors involved in the transport of metal ions acrose the emulsion membrane we reported here and these factors proveided the informations for the selective seperation of some metal ion. Stability constants for cation-macrocyclic ligand and metal ion-anion receiving phase interaction are examined as parameters for the prediction of metal ion transport selectivities Pb^(2+) was transported higher rates than the other metal ions in the mixture solution. The interaction of metal ion to anion in receiving phase is important. S_(2)O_(3)^(2-) in replacement of NO_(3)^(-) in the receiving phase enhances the transport of pb^(2-) since Pb^(2-)-S_(2)O_(3)^(2-) interaction is greater than Pb^(2+)-NO_(3)^(+) interaction.

3차원 물체 복원과 자료 압축을 위한 적응 Simplex-Mesh 기술의 응용

문성환,조용군,강훈 중앙대학교 정보통신연구소 1999 정보통신연구소논문집 Vol.1 No.1

대부분의 3차원 물체 복원 기술은 물체를 다수의 평면으로 나누어 물체의 표면을 근사시켜 표현한다. 주어진 분류치를 사용하여 mesh를 초기화시키는 Marching Cubes 알고리듬과 Delaunay Tetrahedrisation이 널리 사용되고 있다. 이와 더불어 deformable 모델은 적은 수의 가정만으로도 다양한 종류의 데이터들에 대한 복원 및 재구성을 할 수 있기 때문에 일반적인 물체 복원에 적합하다. 현재 deformable 모델이 기반이 된 복원 시스템에 대한 연구가 활발히 진행중이다. 본 논문에서는 곡면으로 이루어진 물체에 대해서 적응 simplex mesh 기술을 바탕으로 3차원 물체를 압축, 복원하는 방법을 제시한다. 이 방법은 미리 정해진 mesh 구조를 변형시키고 곡률과 같은 기하학적인 특성들을 다시 설정하면서 본래의 3차원 물체로 접근시킨다. 시뮬레이션을 통해서 높은 압축률로 물체롤 복원하고, 물체의 모양을 최적으로 기술하기 위해 정점들이 곡률이 높은 곳으로 집중되는 것을 보인다. Most of the 3D object reconstruction techniques divide the object into multiplane and approximate the surfaces of the object. The Marching Cubes Algorithm which initializes the mesh structure using a given isovalue, and Delaunay Tetrahedrisation are widely used. Deformable models are well-suited for general object reconstruction because they make little assumptions about the shape to recover and they can reconstruct objects from various types of datasets. Now, many researchers are studying the reconstruction systems based on a deformable model. In this paper, we propose a novel method for reconstruction of 3D objects. This method, for a 3D object composed of curved planes, compresses the 3D object based on the adaptive simplex-mesh technique. It changes the pre-defined mesh structure, so that it may approach to the original object. Also, we redefine the geometric characteristics such as curvatures. As results of simulations, we show reconstruction of the original object with high compression and concentration of vertices towards parts of high curvature in order to optimize the shape description.