수직적 안모형태와 치아성숙도의 상관관계에 대한 연구

구용한,현홍근,김정욱,장기택,이상훈,한세현,김종철 大韓小兒齒科學會 2010 大韓小兒齒科學會誌 Vol.37 No.1

본 연구는 수직적 안모형태와 치아성숙도의 관계를 평가하고 이러한 연관성에 대한 사춘기 성장의 영향을 평가하기 위한 것이다. 이번 연구를 위해 7세에서 9세, 13세에서 15세 환자 1306명을 Ricketts의 VERT index를 이용하여 수직적 안모 형태를 분류하였고 환자들의 치령을 Demirjian법으로 평가하여 다음과 같은 결과를 얻었다. 1. 모든 군에서 치령이 역령과 비교 시 통계적으로 유의한 수준에서 크게 측정되었다. 2. 사춘기 연령군에서 brachyfacial type의 경우가 dolichofacial type 보다 치아성숙도가 크게 나타나는 경향을 보였다. 여성의 경우는 통계적으로 유의성있게 차이가 나타났으며, 남성의 경우는 통계적 유의성은 보이지 않았다. 3. Brachyfacial type의 경우 사춘기전 군들과 비교 시 사춘기 군들에서 치아성숙도가 유의성있게 높게 나타났으며, dolichofacial type의 경우는 연령층간 치아성숙도의 차이를 보이지 않았다. The purpose of this investigation was to study the relationship between vertical facial pattern and dental maturation in children in pubertal and pre-pubertal periods. The material consisted of lateral head films and panoramic radiographs of 1306 patients. The subjects were selected according to Ricketts's VERT index and other including criteria. These subjects were divided by VERT index to brachyfacial group and dolichofacial group. In each selected subject, dental age was determined according to Demirjian's dental maturity score. All subjects were distributed according to age, vertical facial type and sex, mean and standard deviation of chronological age, dental age and age difference were determined in each group. And the data were analysed to find the difference of tooth maturation by facial pattern. Findings of this study include: 1. In all groups, dental age was determined higher than chronological age in statistically significant level. 2. Compared by vertical facial pattern, in pubertal age groups, it seems that subjects with brachyfacial type presented the tendency to have an advanced dental maturation, only in female group. 3. Compared by pubertal period, brachyfacial groups presented more advanced dental maturation in pubertal groups than pre-pubertal groups.

間接 色分解에 있어서 Masking의 Data에 關한 硏究

具哲會,李相南 釜山工業大學校 1984 論文集 Vol.26 No.-

Following results about Y, M, C mask are obtained by the Indirect-Screen Color Separation Method. We make use of experimental systems which are in use for the student education. -------------------------------------------------------------------------------- MASK Kodak wratten filter No. Exp. time Dev. time A M B A-B range Mask. No. -------------------------------------------------------------------------------- Y 58 50 sec. 4min. 30 sec 0.80 0.49 0.5 0.55 -0.07 -------------------------------------------------------------------------------- M 23A 20 sec. 4min. 0.81 0.48 0.27 0.57 -0.09 -------------------------------------------------------------------------------- C 23A 25sec. 4mim. 0.81 0.51 0.23 0.60 -0.04 -------------------------------------------------------------------------------- In the Projection Method of transparency copy, the results are summerized as follow; ------------------------------------------------------------------------------- MASK Kodak wratten filter No. Exp. time Dev. time A M B A-B range Mask. No. -------------------------------------------------------------------------------- Y 58+0.3ND 45sec. 4min. 30sec. 1.10 0.70 0.18 0.92 0.12 -------------------------------------------------------------------------------- M 33+81EF+0.3ND 45sec. 6min. 1.09 0.71 0.18 0.91 0.15 -------------------------------------------------------------------------------- C 85B+81EF+1.0ND 35sec. 6min. 1.13 0.72 0.19 0.94 0.12 --------------------------------------------------------------------------------

자기공명영상을 이용한 정신분열병 환자의 뇌량크기 측정

성상율,구자섭,조근호,원승희,이종훈,박종한 대한생물치료정신의학회 2004 생물치료정신의학 Vol.10 No.1

Objectives : Nowadays many studies with MRI have reported structurai abnormalltles of corpus callosum of schizophrenic patients. However, the results are various and inconstant. In this study, we attempted to identify structural change of C O ~ U S cailosurn. Method : We measured the size of corpus callosum of the 24 schizophrenia patients (male 11, female 18) who were diagnosed by DSM-IV (19943, visited at department of psychiatry, catholic university hospital of Daegu from January 2002 to December 2003, by using midline sagittal slice of MRI. These results were compared with the size of corpus callosum of 25 controls (male 7, female 78). We divided corpus callosurn into 7 areas. We calculated and compared the areas of each subregion, mid-sagittal cerebral area, and entire corpus callosum. The results were analyzed by independent t-test. Result :When we compared subregion to corpus callosum adjusted wth mid-sagittal cerebral area, schlzoph-renia patients had significantly smaller genu (1.64k0.32 vs. 1.43k0.26 p<O.O5) and splenium (2.16f0.27 VS. 1.96+0.30 ; ~(0.05). Similarly, the ratio of total corpus callosum to midline sagittal cerebral area (%)(7.50*0.72 vs. 6.90t0.82 ~(0.05) was significantly smaller In schizophrenia than control group. Conclusion : In this study, we found significant differences in corpus callosum between schizophrenic patients and normal control group.

장간막의 염증성 근섬유모세포종 - 1예 보고 -

임성직,김교영,박재훈,김윤화,박용구,이주희,양문호 대한병리학회 1999 Journal of Pathology and Translational Medicine Vol.33 No.9

컴퓨터 게임과 학업성취도와의 관계 연구

구성옥,맹승렬,유관희 한국컴퓨터교육학회 2005 컴퓨터교육학회 논문지 Vol.8 No.4

초음파 반사 패턴과 주파수 대역 분할 신호처리를 이용한 다층구조인 노내 간극 측정

구길모,심철무,김종환,김상백,김희동,박치승 한국비파괴검사학회 2000 한국비파괴검사학회지 Vol.20 No.4

모의 원자로내 용융물 냉각 실증 실험 결과 용융물 Al₂O₃/Fe themite 와 lower head vessel사이에 간극이 발생된다. 간극을 정량적으로 측정하기 위한 기존의 초음파 방법은 구조물의 복잡성과 2300℃ 에서 용융되는 thermite Al₂O₃/Fe, Al₂O₃의 영향으로 발생되는 lower head의 열영향부위(HAZ)의 금속학적인 결정입자 크기의 변화로 결정 계면으로부터 발생되는 잡음신호와 초음파 산란, 감쇠, 모드 변환 등이 발생되어 신뢰성이 떨어지고 있다. 간극을 정량적으로 측정하기 위해서 thermite와 lower head 사이에 물이 체워진 형태의 즉 고체, 액체, 고체의 다층구조에서 초음파의 진행 및 반사 형태를 분류 및 분석하였다. 결정립의 잡음을 억제하기 위하여 주파수대역의 확률 처리 방식인 PT(polarity threshold) 알고리즘을 이용하여 약 6dB 신호 대 잡음비의 개선효과를 가져왔다.

觀光호텔의 TQM戰略에 關한 硏究

구경원,이상우 韓國食飮料經營硏究會 1996 食飮料經營硏究 Vol.6 No.-

TQM is a whole process of systemizing, documenting and measuring of service quality scientifically to achieve zero defects in product quality and to continue to improve the body of the product quality by itself. To have this process be improved continuously, first of all it needs to prepare an ideal environment to understand and to conform to its internal and external customers', that is every guests' and employees' expectations and demands. Then it has to be followed by the next step removing some negative aspects that could be derived from the first mentioned process The third step is to cut the cost by suitable compensation rather than an attitude trying to solve the problems in an easy way. The last essential factor for setting up TQM system is to make good use of the outstanding feature or process as it is reviewed against the superior benchmark. The purpose of this study is meet the customers' expectations and to maximize the hotel 's profits by searching TQM(total quality management) strategy in hotels. To attain this research's objective, it follows these three details. Firstly, it defines TQM and its contents. Secondly, it provides the standard of hotel TQM throughout some case studies. Thirdly, it suggests TQM strategic plan in tourism hotel as one of professional management strategies. Two useful methods are used together to achieve the goal of this study. To confirm its theoretical consideration, descriptive studies by the research documents published in arid out of the country is used. The other is case studies of TQM execution in real hospitality industry, which present the cases of the airline, Jefferson Memorial and the hotel. This research is targeting to demonstrate the successful TQM's exercise ill a hotel industry by completing the theoretical studies and case studies on service product quality with an understanding of its importance. As it is said earlier, to lead to the successful TQM's practice, it is necessary to maintain a constant training of the employees. Secondly, it also must identify where it has to focus on to deliver a professional quality management. Thirdly, effective quality management organization needs to be build up. The manager's strong will to accomplish and the employee' active participations are the last condition to be succeed. Once again this study places an emphasis on the fact that TQM is critical to maximize the customers' satisfaction and the hotel's profitability. It is also very worthwhile to have every people working on front line recognize why the TQM is important and further more how they can contribute to improve their service quality by a positive participation and a careful observation of TQM 's operating in their property.

Ball-bar Artifact 를 이용한 CMM의 공간 오차 측정 및 분석

구상서,이응석 한국공작기계학회 2001 한국공작기계학회 춘계학술대회논문집 Vol.2001 No.-

Volumetric error measurement and calibration of a coordinate measuring machine are studied by using a Ball-Bar artifact. Examples of the Ball-Bar design are shown using in bar materials and precision steel balls. Also, for the uncertainty error using the Ball-Bar is discussed. Method of Ball-Bar artifact and the analysis of the error vectors are proposed. Using the Ball-Bar data, we studied the method of volumetric errors analysis of a coordinate measuring machine.

日本腦炎管理를 爲한 金堤郡內 殺蟲劑 殘留噴霧作業에 關한 考察

具聖會 서울大學校 保健大學院 1968 公衆保健雜誌 Vol.5 No.2

The insecticide residual spraying operation to the cowsheds and pigsties was carried out to evaluate the residual effect of three kind of insecticides and to find out the possible way of control of Japanese encephalitis transmission at Kimje-gun, Chollapuk-do, from 22 June to 5 July 1967. On 21 June, 170 village chiefs in Kimje-gun were trained on the inescticide residual spraying operation by three technical staffs of the National Malaria Eradication Service. By using of Hudson X-pert sprayer with HSS 8002 nozzle tip, all the sprayable surfaces of 4,810 cowsheds and 14,890 pigsties in Kimje-gun were covered. In order to evaluate of the reducing the density of mosquitoes, day time resting place mosquitoes collection in selected cowsheds was carried out after and before insecticides spraying operation. The results can be summarized as follows: 1. One spray man could cover 45∼46 sheds on an average per day. 2. The amount of insecticide consumed per shed was 54.68gm of DDT(75%), 17.24cc. of Sumithion(50%) or 22cc. of DDVP(25%). 3. In comparison with control counties, the morbidity late of Kimje-gun was the lowest at 11 per 100 thousand while those of Kochang and Jungup-gun were 32 and 19 respectively. 4. In comparison with three kinds of insecticides, the morbidity rate of DDVP area was the highest at 17, while those of DDT and Sumithion areas were 11 and 7 respectively. 5. The residual activity on Culex tritaeniorhyncus of DDVP continued less than 10 days.

결합제를 이용한 국산 플라이애쉬이 고형화와 그 강도에 관한 연구

구상만,이재준 한양대학교 에너지·환경기술연구소 1997 에너지·環境技術論文集 Vol.3 No.-

결합제로서 물유리를 이용하여 영동, 서천, 그리고 삼천포의 플라이애쉬를 경화시켜 그 강도와 안정성을 조사하였다. 첨가제로써 CaO, NaOH, 물, 및 물유리의 양을 변화하면서 실험하였다. 영동 플라이애쉬를 이용한 시편 (영3d)에서 양생 28일후의 최고 강도가 218㎏f/㎠였다. 다음에 이들 시편들을 용출시켜 용출수의 pH 와 Ca 함량 등을 조사하여 안정성을 조사하여본 결과, 높은강도를 보인 시편들이 상대적으로 안정함을 알 수 있었다. Solidifications of Youngdong, Seocheon, and Samcheonpo fly ashes were carried out using liquid sodium silicate as a binder. The compressive strengths with different times and stabilities of solidified products were investigated. Liquid sodium silicate, CaO, NaOH, and water content were varied as experimental parameters. The highest strength of samples after 28days-curing was 218㎏f/㎠. After these samples were leached, the stability was investigated through the tests of pH, Ca content, and so on. Samples with the higher strength exhibited better stabilities.