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THE STRUCTURE OF THE MANDIBULAR CONDYLE IN THE PANORAMIC RADIOGRAPH (파노라마방사선 사진에서의 하악과두구조)

  • Choi Soon-Chul
    • Journal of Korean Academy of Oral and Maxillofacial Radiology
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    • v.20 no.2
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    • pp.163-167
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    • 1990
  • The author has evaluated the panoramic image of the mandibular condyle according to its horizontal condylar angle (0˚, 10˚, 20°, 30°, 40°) and mandibular position (standard, 25㎜ forward and reverse position). The results were as follows: 1. The larger the horizontal condylar angle was, the larger the horizontal magnification was in all positions. 2. In case of small horizontal condylar angle, profile view could be obtained in 25㎜ forward and reverse position. 3. In case of large horizontal condylar angle, profile view could not be obtained in any positions.

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The Talus-1st Metatarsal Angle, the Talo-Horizontal Angle and Calcaneal Pitch Angle of Young Men in Korea (한국 정상 젊은 남성에서의 거골-제 1 중족골간 각과 거골 수평각 및 종골 경사각)

  • Lee, Young-Koo;Yim, Soo-Jae;Lee, Sang-Hyok;Park, Chan-Ho;Lee, Sang-Hun
    • Journal of Korean Foot and Ankle Society
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    • v.14 no.2
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    • pp.161-164
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    • 2010
  • Purpose: The purpose of this study is to find out the normal angles of the talus-1st metatarsal angle, the talo-horizontal angle and calcaneal pitch angle for diagnosis of foot deformity in Korea. This would be helpful as it would provide a basic angular measurement of flat and cavus foot that indicates the need for operation. Materials and Methods: Within a period of four months from January 2007 to April 2007, We have established 600 feet of 300 males without trauma history of foot. The source to image distance is 40 inches and erect weight bearing radiographs are obtained in anteroposterior and lateral projections. The significant angular measurements that define flat or cavus foot are the talus-1st metatarsal angle, the talo-horizontal angle and calcaneal pitch angle. Results: The mean age was 21 years (19-22 years) old. The mean talus-1st metatarsal angle was $0{\pm}6.9{^{\circ}}$, the mean talo-horizontal angle was $25.8{\pm}4.5{^{\circ}}$ and the mean calcaneal pitch angle was $23.9{\pm}5.1{^{\circ}}$. Conclusion: We can consider that mean talus-1st metatarsal angle, talo-horizontal angle and calcaneal pitch angle are $0{\pm}6.9{^{\circ}}$, $25.8{\pm}4.5{^{\circ}}$ and $23.9{\pm}5.1{^{\circ}}$ as an normal angle limit of young age in Korea.

Development of Optical Sighting System for Moving Target Tracking

  • Jeung, Bo-Sun;Lim, Sung-Soo;Lee, Dong-Hee
    • Current Optics and Photonics
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    • v.3 no.2
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    • pp.154-163
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    • 2019
  • In this study, we developed an optical sighting system capable of shooting at a long-distance target by operating a digital gyro mirror composed of a gyro sensor and an FSM. The optical sighting system consists of a reticle part, a digital gyro mirror (FSM), a parallax correction lens, a reticle-ray reflection mirror, and a partial reflection window. In order to obtain the optimal volume and to calculate the leading angle range according to the driving angle of the FSM, a calculation program using Euler rotation angles and a three-dimensional reflection matrix was developed. With this program we have confirmed that the horizontal leading angle of the developed optical sighting system can be implemented under about ${\pm}8^{\circ}$ for the maximum horizontal driving angle (${\beta}={\pm}12.5^{\circ}$) of the current FSM. Also, if the ${\beta}$ horizontal driving angle of the FSM is under about ${\pm}15.5^{\circ}$, it can be confirmed that the horizontal direction leading angle can be under ${\pm}10.0^{\circ}$. If diagonal leading angles are allowed, we confirmed that we can achieve a diagonal leading angle of ${\pm}10.0^{\circ}$ with a vertical driving angle ${\alpha}$ of ${\pm}7.1^{\circ}$ and horizontal driving angle ${\beta}$ of ${\pm}12.5^{\circ}$.

Development of Horizontal Attitude Monitoring System for Agricultural Robots (농업 로봇 용 수평 자세 모니터링 시스템 개발)

  • Kim, Sung Deuk;Kim, Cheong Worl;Kwon, Ik Hyun;Lee, Young Tae
    • Journal of the Semiconductor & Display Technology
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    • v.18 no.2
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    • pp.87-91
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    • 2019
  • In this paper, we have development of horizontal attitude monitoring system for agricultural robots. A two-axis gyro sensor and a two-axis accelerometer sensor are used to measure the horizontal attitude angle. The roll angle and pitch angle were measured through the fusion of the gyro sensor signal and the acceleration sensor signal for the horizontal attitude monitoring of the robot. This attitude monitoring system includes GPS and Bluetooth communication module for remote monitoring. The roll angle and pitch angle can be measured by the error of less than 1 degree and the linearity and the reproducibility of the output signal are excellent.

THE STRUCTURE OF THE MANDIBULAR CONDYLE IN THE PANORAMIC RADIOGRAPH -Ⅱ- (파노라마방사선사진에서의 하악과두구조 -Ⅱ-)

  • Choi Soon-Chul
    • Journal of Korean Academy of Oral and Maxillofacial Radiology
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    • v.23 no.2
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    • pp.207-211
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    • 1993
  • The auther has evaluated the panoramic image of the mandibular condyle according to its horizontal codylar angle(0°, 10°, 20°, 30°, 40°) and intercondylar distance( 9.5, 11.0, 12.5, 14.0㎝). The Results were as follows: 1. In all horizontal condylar angle, the farther the intercondylar distance was, the smaller the horizontal length in radiogram was. 2. The increased the horizontal condylar angle was, the longer in horizontal direction and the shorter in vertical direction the image of superior condylar surface was. 3. In case of large horizontal condylar angle, the real mesial surface of condyle was projected to the posterior surface on radiograph.

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STUDY ON THE CHARACTERISTICS OF CRANIOFACIAL SKELETON OF ANGLE'S CLASS III MALOCCLUSION CASES (Angle III급 부정교합자의 악안면골격 특성에 관한 연구)

  • Yoo, Young-Jae;Cha, Kyung-Suk
    • The korean journal of orthodontics
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    • v.21 no.2
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    • pp.457-468
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    • 1991
  • This investigation was designed to categorize Angle's class III malocclusion groups through analyzing horizontal and vertical components of craniofacial skeleton in Angle's class III malocclusion. The material selected for this study consisted in standard lateral cephalogram of one hundred and fifty five children, seventy four boys and eighty one girls, aged 6 through 15 years, having Angle's class III malocclusion. On the basis of findings of this study, the following results were obtained. 1. In horizontal skeletal classifications,16 groups were classified FMN-A-B, SE-FMN-A according to the Ba-SE-Me, Ba-SE/R. 2. The sequences that have relatively high frequency are as follow; a) Horizontal Group l b) Horizontal Group 3 c) Horizontal Group 5 d) Horizontal Group 9 e) Horizontal Group 4 3. In vertical skeletal classification, 8 groups were classified according to the PMV/PP, PMV/OP, PMV/MP. 4. The sequences that relatively high are as follows; a) Vertical Group 1 b) Vertical Group 3 c) Vertical Group 4 d) Vertical Group 8.

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A STUDY ON THE CHARACTERISTICS OF CRANIOFACIAL SKELETON OF ANGLE'S CLASS II MALOCCLUSION CASES (Angle II급 부정교합자의 악안면골격 특성에 관한 연구)

  • Lee, Jin-Woo;Cha, Kyung-Suk
    • The korean journal of orthodontics
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    • v.21 no.1
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    • pp.171-183
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    • 1991
  • This investigation was designed to categorize Angle's class II malocclusion groups through analyzing horizontal and vertical components of craniofacial skeleton in Angle's class II malocclusion. The material selected for this study consisted in standard lateral cephalogram of two hundred and twenteen children, eighty eight boys and one hundred twenty four girls, aged 6 through 18 years, having Angle's class II malocclusion. On the basis of findings of this study, the following results were obtained. 1. In horizontal skeletal classifications, 16 groups were classified according to FMN-A-B, SE-FMN-A, Ba-SE-Me, Ba-Se/Ra P. The sequences that have relatively high frequency are as follows: a) Horizontal Group 16 b) Horizontal Group 12 c) Horizontal Group 13 d) Horizontal Group 9 & 15 2. In vertical skeletal classification, 8 groups were classified according to the PMV/PP, PMV/Occ. P. PMV/Mn. P. The sequences that relatively high frequency are as follows; a) Vertical Group A b) Vertical Group D c) Vertical Group C d) Vertical Group H 3. In vertical and horizontal skeletal classifications, the sequence that relatively high frequency are as follows; a) Group13-A b) Group16-A & 9-A c) Group12-A & 15-A d) Group16-C

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INTERRELATION BETWEEN THE ANGLE FORMED BY THE MIDSAGITTAL PLANE AND THE MANDIBULAR ANGLE AND THE HORIZONTAL INCLINATION OF THE CONDYLAR LONG AXIS (시상정중면에서 하악우각부 사이의 각도와 하악과두장축의 수평경사도간의 상호관계)

  • Oh Wan Soo;Choi Soon Chul
    • Journal of Korean Academy of Oral and Maxillofacial Radiology
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    • v.22 no.1
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    • pp.109-116
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    • 1992
  • To determine the horizontal inclination of the condylar long axis without taking the submentovertex radiograph, the author studied the interrelation between the angle formed by the midsagittal plane and the mandibular angle and the horizontal inclination of the condylar long axis. In 56 subjects, the author measured the angle formed by the midsagittal plane and both mandibular angle using the modified Twirl Bow and the horizontal inclination of the both condylar long axis from submentovertex radiographs. The result were as follows: The mean value of the angle formed by the midsagittal plane and the mandibular angle was l8.50±1.48° in right side and 19.30±1.55° in left side. The mean value of the horizontal inclination of the condylar long axis was 19.25±7.56° in right side and 20.27±7.050 in left side. The interrelation of the two angles was represented as follows: y = 20.31-0.0094× (r = -0.482, p<0.01) in right side and y = 20.64-0.066×(r =-0.301, p<0.05) in left side (y; the horizontal inclination of the condylar long axis, x; the angle formed by the midsagittal plane and the mandibular angle).

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A Characteristics of Horizontal Swing Angle of Suspension Clamp in V type Suspension String Sets (V련 현수애자장치의 클램프 횡진 특성)

  • Sohn Hong-Kwan;Lee Hyung-Kwon;Min Byeong-Wook
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.54 no.3
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    • pp.133-138
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    • 2005
  • This paper presents a characteristics of horizontal swing angle in V type suspension string sets for 765kV T/L. The design of V type suspension string set does not differ from that of general string set for general towers, but it prevents instabilities from swing motion by the horizontal angle and by the wind pressure. We were designed specially 6 conductor yoke, arcing horn and earth horn. And we were decided to 550mm for a distance of strings. We were carried out characteristics of horizontal swing test and movement of mass center test for V-string sets of 400kN single, 300kN double and 400kN double. This products will be used for 765kV T/L of 1 circuit in suspension towers.

An Experimental Study on Flow Angle with Swirl in a Horizontal Circular Tube (수평 원통 관에서 선회를 동반한 유동각에 대한 실험적 연구)

  • Chang, Tae-Hyun
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.2 no.4
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    • pp.82-87
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    • 2003
  • Flow angle with Swirl in a horizontal circular tube and a cylindrical annuli were experimentally studied for its visualization. This present investigation deals with flow angle, flow visualization studies and vortex core by using oil smoke and a hot wire anemometer for Re = 40,000 and 50000 at X/D = 41, 59 and 71 in a horizontal circular tube. In the swirl air flow, a vortex core was formed at high swirl intensity along the test tube. The flow angle and the vortex core depended on the swirl intensity along the test tube. The results of flow angles with swirl measured by flow visualization and hot wire reasonably agree with those of Sparrow One of the primary objectives of this research was to measure the flow angle with swirl in a cylindrical annuli along the test tube for different Reynolds numbers. The Reynolds number for these measurements ranged from 60,000 to 100,000 with L/D = a to 4.

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