흰쥐 두힘살근 지배신경축 규명에 관한 연구

강태천,이흥식,이인세,서제훈,이봉희 대한해부학회 1997 Anatomy & Cell Biology Vol.30 No.6

상악 4절치의 후방견인시 나타나는 현상에 관한 유한요소법적 분석

천옥진,김태우,서정훈 대한치과교정학회 1995 대한치과교정학회지 Vol.25 No.5

상악치열에서 제 1 소구치를 발거하고, 이 위치로 견치를 후방이동시킨 상태에서 retraction archwire를 사용하여 상악 4절치를 한 묶음으로 후방견인시켰을 때 초기에 나타나는 모든 힘 체계와 개개치아의 이동양상을 살펴보고 바람직하지 않은 치아이동을 감소시키기 위한 방안을 모색하고자 본 연구를 시행하였다. 먼저 유한요소법을 이용하여 상악 치아와 치근막의 해부학적 형태 및 생체적 특성을 컴퓨터로 재현시키고 모형화된 브라켓을 부착시킨 후, beam 요소를 사용하여 5종의 retraction loop를 하나씩 부여한 다섯 가지의 탄선을 모형화하고, 브라켓과 탄선간에는 gap 요소를 사용하여 모형화함으로써 전체 유한요소 모형을 완성하였다. loop의 형태, activation의 양, gable bend와 torque의 조건에 따른 차이를 검토하기 위해, 각 조건을 변화시켜 loop를 activation시켰을 때 탄선이 발휘하는 힘과 모멘트, 치아이동의 변위를 3차원적으로 정량적 및 가시적으로 평가하고 비교, 분석한 결과 다음과 같은 결론을 얻었다. 1. tear-drop loop archwire 사용시 각 치아의 근원심이동 및 설측이동이 발치공간 폐쇄에 도움이 되었으나, 바람직하지 못한 상하이동과 각 방향으로의 회전이동이 부가적으로 나타났다. 2. 다섯 가지의 retraction archwire 중 T-loop archwire에서 공간폐쇄에 도움이 되는 치아이동이 가장 작게 나타났으며, 각 방향으로의 회전이동 역시 가장 작게 나타났다. 3. tear-drop loop archwire에서 activation 양을 증가시킴에 따라 공간폐쇄에 도움이 되는 치아이동이 점차 증가했으나, 바람직하지 못한 상하이동과 각 방향으로의 회전이동이 함께 증가했다. 4. tear-drop loop archwire에서 loop의 전후방에 gable bend 부여시 전치에서 근원심방향의 치체이동에 도움이 되었으나, 모든 치아에서 상하이동과 각 방향으로의 회전이동이 함께 증가했다. 5. tear-drop loop archwire의 절치부에 치근 설측 torgue 부여시 이들 치아의 순설경사를 개선시키는 효과를 얻었으나, 그 반작용으로 견치 치관의 설측회전이 크게 증가했으며, 전치의 상하이동과 모든 치아에서 각 방향으로의 회전이동이 증가했다. This study was designed to investigate force systems and tooth movements produced by retraction archwire during retraction of four maxillary incisors after the maxillary canine retraction into the maxillary first premolar extraction space using the computer-aided three-dimensional finite element method. A three-dimensional finite element model, consisting of 2248 elements and 3194 nodes, was constructed. The model consisted of maxillary teeth and surrounding periodontal membranes, .022˝x.028˝-slot brackets, and 5 type of retraction archwires(.019˝x.025˝stainless steel archwire) modeled using the beam elements. The contact between the wire and the bracket slot was modeled using the gap elements because of the non-linear elastic behaviors of the contact between them. The forces and moments, and displacements produced by retraction archwire were measured at various conditions to investigate the difference according to types of loops, magnitudes of activation force, gable angle, and anterior lingual root torque. The results were expressed quantitative and visual in the three-dimensional method. The following conclusions can be drawn form this study : 1. When the tear-drop loop archwire was activated, the mesio-distal and lingual translational movements of the teeth helped to close the extraction space, but unwanted movements of the teeth including intrusions and extrusions, and rotational movements in each direction occurred. 2. Activation of T-loop archwire compared with those of other types of retraction archwires produced the least translational movements of the teeth helped to space closure and also least unwanted movements of the teeth. 3. Increasing amount of activation in the tear-drop archwire led not only to increase of translational movements of the teeth helped to space closure, but also increase if unwanted movements of the teeth. 4. Addition of gable bend in the tear-drop archwire helped anterior teeth to translational movements in the mesio-distal direction, but increased unwanted movements of the teeth. 5. Addition of anterior lingual torque in the tear-drop archwire helped central and lateral incisor to improve their facio-lingual inclination, but increased unwanted movements of the teeth.

Mn이 첨가된 V₂O_(5)/TiO₂ 촉매상에서 질소산화물의 저온 SCR 특성

천태진,최상기,최성우 한국환경과학회 2004 한국환경과학회지 Vol.13 No.6

V₂O_(5)/TiO₂ catalysts promoted with Mn were prepared and tested for selective catalytic reduction of NOx in NH3. The effects of promoter content, degree of catalyst loading were investigated for NOx activity while changing temperatures, mole ratio, space velocity and O₂ concentration. Among the various V₂O_(5) catalysts having different metal loadings, V₂O_(5)(l wt.%) catalyst showed the highest activity(98%) under wide temperature range of 200-250 C. When the V₂O_(5) catalyst was further modified with 5 wt.% Mn as a promoter, the highest activity(90-47%) was obtained over the low temperature windows of 100-2000. From Mn-V₂O_(5)/TiO₂, it was found that by addition of 5 wt.% Mn on V₂O_(5)/TiO₂ catalyst, reduction activity of catalyst was improved, which resulted in the increase of catalytic activity and NOx reduction. According to the results, NOx removal decreased for 10%, but the reaction temperature down to 100℃.

Mn-Ce 복합 산화물에 의한 톨루엔 촉매 산화

천태진,최성우,이창섭 한국환경과학회 2005 한국환경과학회지 Vol.14 No.4

Activity of manganese oxide supported on γ-Al₂O₃ was increased when cerium was added. Also, cerium-added manganese oxide on v-Al₂O₃ was more effective in oxidation of toluene than that without cerium. XRD result, it was observed that MnO₂+CeO₂ crystalline phases were present in the samples. For the used catalyst, a prominent feature has increased by XPS. TPRITPO profiles of cerium-added manganese oxide on γ-Al₂O₃ changed significantly increased at a lower temperature. The activity of 18.2 wt% Mn+10.0 wt% Ce/γ-Al₂O₃ increased at a lower temperature. The cerium added on the manganese catalysts has effects on the oxidation of toluene.

分權化된 組織의 社內對替價格決定方法에 관한 小考

全泰玩 건국대학교 1985 商經論叢 Vol.- No.20

Monotone Chain의 도구경로를 구하는 최적 알고리즘

양태천 慶星大學校 1992 論文集 Vol.13 No.3

Shrinking and expanding solids (called offsetting) is useful in many engineering applications. In CAD/CAM, to find the the tool path (offset) for a given shape, an efficient algorithm is needed. In this paper, we give an optimal linear time algorithm for findidng the tool path for a monotone chain using a stack.

行政電算化가 行政變數에 미치는 影響에 關한 小考

韓奉川 경일대학교 산업정보연구소 1994 産經硏究 Vol.5 No.1

After 1983, Korean Government have carried administration computing program. It is good bet that this program will take various impacts. This study is designed to analyze the impacts of administration computing in administration variable. For the purpose of, this study used the available sundry records bibliography, the previous research articles, the statistical data in administration computing. This study will employ administration variable as a depended variable to analyze. The major implications and results of this study are as follow: (1) administration computing have been effects on civil service. Public servant have learned new knowledges and technologies used of computer, got the information for his decision making, been awaken to its significance by administration computing. (2) administration computing have been effects on administration structure. It was built up new goals in organization, made up new organization and public servant's duties, and made a addition to new roles by administration computing.

복싱 指導者의 職業 價値觀과 職務滿足의 관계

송순천,백태길,김진표 龍仁大學校 武道硏究所 1998 武道硏究所誌 Vol.9 No.1

The purpose of this study was to examine the relationship betwiin work value of boxing coach their job satisfaction. For this purpose, review of the related literatures that work value and job satistaction. This study setting up the population was boxing coaches, and questionnaire survey were conducted to boxing coach who was participated national tournament June 24-29 at SUNG-NAM gymnasium. The subject sampling used cluster sampling method. And data selection considered age, teaching grade of boxing coach. Data selected cluster sampling was 150 and final used data was 107. As an instrument for the collection of data, first, the scale of work value used as a modification Sim, young-gil(1987)'s view by the medel of value of Kluckhohn(1961). And Job satisfaction's scale used the developed JDI(Job Descriptive Index) by Smith (1969) and it translated in Korean and standardized by Cho, young-tak(1996). The Statistics employed in the study were frequencies statistics and one-way ANOVA, ANOVA. As a result of the analysis of collected data, the following conclusions were obtained: 1. A director of boxing, have hegative human relation in relative of coach, others the human relationship of married coach is more actie than single coach. 2. The older boxing coach is satisfied with fob task, satisfaction of task is totally higher than the coach, other and the married coach is higher than single. 3. The positive, active value of job is high the satisfaction about job itself, relative satisfaction of collegue.

골판지상자 제조과정에서 화상처리를 이용한 실시간 마-크코-드 인식

신천우,김태효 慶南大學校 附設 工業技術硏究所 1994 硏究論文集 Vol.12 No.-

골판지상자의 제조에서, 골판지를 상자모형으로 프레스하는 공정이 기계의 진동이나 편차에의하여 골판지의 위치가 어긋나는 경우가 있다. 그러므로 골판지상자 제조에서 골판지의 위치인식이 중요한 포인트가 되며, 이를 실현하기 위하여 화상인식처리를 이용한 소형의 실시간 위치인식 시스템을 구현하고 시험하였다. 실험은, 제조공장의 기기에 설치하여 행하였으며, 골판지의 종류와 밝기, 마-크 코-드의 색상과 밝기 및 단일광원에 대한 골판지의 명도분포등을 측정하였다. In manufacture of corrugated cardboard boxes, the corrugated cardboards are generally cut according to the shape of box by a pressing machine. It is possible to have position error of the corrugated cardboards due to some mechanic vibrations or deviations. Therefore, to recognize the position of them is the main point, In order to realize it, the small and real-time recognition system was realized and tested. The test was practrically proceeded in a factory. In the test, the luminance variation due to some kinds of corrugated cardboards and the mark codes with different colors, and the brightness distributions of the boards by the single light source were measured.

행정의 이념변수로서의 신자유주의 사상에 관한 이론적 소고

한태천 경운대학교 산업기술연구소 2001 産業技術硏究論文誌 Vol.3 No.2(A)

This paper is a theoretical study on the Neo-Liberalism which is Public Administration Ideological Variable. Public Administration is affected by public administration' variable: structure, man, environment, and ideology. Under the influence of Liberalization and Opening which are major logic of Neo-Liberalism Korean Public Administration' function shifted from regulator to coordinator about a people' everyday life. Judging from study result Liberalization and Opening which are major logic of Neo-Liberalism is a ideological variable with efficiency, effectivity, democracy, legality, and neutrality in Korean Public Administration.