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디지털 스캔 데이터를 활용한 무치악 치조제 관계의 평가와 인공치 선택: 편측 교차교합의 가철성 의치 수복 증례
김정훈,김종은,박영범,이근우,Kim, Jeong-Hoon,Kim, Jong-Eun,Park, Young-Bum,Lee, Keun-Woo 대한치과보철학회 2019 대한치과보철학회지 Vol.57 No.3
치아가 발거된 치조제는 수직, 수평적인 골흡수가 점진적으로 일어나게 되며 흡수의 양상은 수평적으로 서로 다르게 나타난다. 이로 인해 상대적으로 하악궁이 상악궁에 비해 확장되는 경향을 보이며, 상악과 하악 치조제 간의 위치관계에 따라 적합한 인공치 배열 방법을 선택하여 의치의 안정을 도모해야 한다. 본 증례는 77세 남자환자로 기존에 사용하던 상악 총의치, 하악 국소의치의 재제작을 희망하였다. 상악과 하악 치조골의 흡수정도에서 차이를 보여 치조제 간의 위치관계에 대한 정확한 평가가 필요하였고, 이를 위해 치과용 CAD 소프트웨어를 활용했다. 교합기에 부착된 주모형과 교합제를 스캔하여 디지털 스캔 데이터로 변환하고, CAD 소프트웨어 상에서 치조정간선의 법칙에 따라 상악과 하악 치조제간의 위치관계를 평가하여 우측 구치부를 편측 교차교합으로 배열하였다. 보철물 완성 후 주기적인 검진을 거친 결과 의치는 적절한 유지, 안정, 지지를 얻었고 환자 또한 심미적, 기능적으로 만족하였다. 본 증례에서는 상악의 완전 무치악, 하악의 부분 무치악 환자에서 치조제간의 위치관계에 대한 정확한 평가를 위해 디지털 기술을 활용하였으며, 이를 통해 보철치료의 임상 및 기공과정을 보다 효율적으로 진행할 수 있었기에 이를 보고하고자 한다. After the teeth were extracted, maxillary and mandibular alveolar ridges show the opposite resorption pattern and as a result, the mandibular arch is enlarged than maxillary arch relatively. In this situation, we should evaluate both alveolar ridge relationship and arrange the artificial teeth properly for stability of removable prosthesis. This case is a 77 years old male patient who wishes to make removable prosthesis and has atrophic alveolar ridge. By use of model scanner and CAD software, the angle between interalveolar crest line and occlusal plane was easily measured. Depending on the measurement, the artificial teeth are arranged in unilateral cross bite and after completion, patient was satisfied with the denture which showed proper stability, retention, support.
THERMAL MODELING TECHNIQUE FOR A SATELLITE IMAGER
김정훈(Jung-Hoon Kim),전형열(Hyoung Yoll Jun),유명종(Myoung-Jong Yu),김병수(Byoungsoo Kim) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.5
Conductive and radiative thermal model configurations of an imager of a geostationary satellite are presented. A two-plane method is introduced for three dimensional conductive coupling which is not able to be treated by thin shell plate thermal modeling technique. Especially the two-plane method is applied to massive matters and PIP(Payload Interface Plate) in the imager model. Some massive matters in the thermal model are modified by adequate correction factors or equivalent thickness in order to obtain the numerical results of thermal modeling to be consistent with the analytic model. More detailed nodal breakdown is specially employed to the object which has the rapid temperature gradient expected by a rule of thumb. This detailed thermal model of the imager is supposed to be used for detailed analyses and test predictions, and be correlated with the thermal vacuum test results before final in-flight predictions.
김정훈(Jeong Hoon Kim),김선기(Sun Ki Kim),조현종(Hyeon Jong Cho),하동윤(Dong Yoon Ha) 대한CT영상기술학회 2007 대한CT영상기술학회지 Vol.9 No.1
Purpose The image quality relies on how it can clearly and correctly present the fine structure of human body into the image and the factors influencing on the quality of CT image are accuracy of CT number, noise, spatial resolution and contrast resolution, artifact, dosimetry and accuracy of device. Among these factors, this paper finds out the change of CT number, spatial resolution, contrast resolution, linearity of CT number, etc. followed by the noise change which is the standard deviation of CT number. Materials and Methods As for CT device, Light speed CT/I/pro of GE medical company was used for the CT device of this experiment. CT phantom used in this experiment is the Nuclear Associates CT for CT performance evaluation designed by the American Association of Physicists in Medicine (AAPM) and manufactured by Victoreen, and it is used for CT performance evaluation in Korea. For the method of experiment, the size of noise in CT Phantom was changed into 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 16, 18 and 20 and its change was compared and recorded by measuring CT number, high contrast spatial resolution, low contrast spatial solution, linearity of CT number, etc. for 4 times. The size of noise was changed with slice thickness, reformative algorithm, kVp, dosimetry, etc. Results 1. CT numb.er CT number in the change of noise changed from 0 to 0.9HU with the noise change from 1 to 10 and changed about -3HU with the noise change from 12 to 20. 2. High contrast resolution The high contrast resolution in the change of noise changed from 0.75 to 1mm with the noise change from 1 to 8 and decreased to 1.25mm with the noise change from 9 to 20. 3. Low contrast resolution The low contrast resolution in the change of noise changed from 3.2 to 6.4mm with the noise change from 1 to 4 and changed from 19. 5 to 25. 4mm with the noise change from 7 to 10. However, the low contrast resolution changed a lot above the scale of measuring Phantom with the noise change up to 12-20. 4. Linearity of CT number The linearity of CT number in the change of noise uniformly showed the change of CT number such as water, acrylic, nylon, polystyrene, polyethylene and lexan which are used for the linearity within the permitted limit with the noise change from 1 to 10, however, CT number rapidly fell down with the noise change from 12 to 20. Conclusion In the CT performance evaluation from the noise change, the result shows that CT. number, high contrast resolution and linearity of CT number maintained their performance recommended by Korean Institute for Accreditation of Medical Image within the permitted limit of noise but low contrast resolution ran off the permitted limit of noise in the noise with over 7. In the experiment, the result does not satisfy the current condition which has the accepTable standard easier than the company’s regulation. Therefore, it is necessary to suggest the performance evaluation list and criteria satisfying the condition used in the real examination for the patients.
LVDC 선로 고장유형에 따른 DC Fuse 용단 특성
김정훈(Jung-Hoon Kim),허종(Jong Heo),진현수(Hyun-Su Jin),이상국(Sang-Gook Lee),장수형(Su-Hyeong Jang),안길영(Kil-Young Ahn),김영근(Young-Geun Kim) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
기술발전에 힘입어 전력산업 역시 기존의 관념이 타파되고 있다. 신재생발전원과 전기자동차의 도입 등 전력시스템 구성과 환경의 변화 속에서 직류시스템의 도입을 피할 수 없게 되었다. 직류배전시스템 실용화를 위해서는 인체안전 및 선로보호를 위한 보호설비의 연구가 필요하다. 아울러 저압직류(LVDC) 배전계통에서는 DC Fuse의 적절한 사용이 매우 중요하다. 현재 Fuse는 지락보호에 적절하지 않다고 보고되고 있어 본 논문에서는 위 사항에 대하여 PSCAD/EMTDC를 활용하여 확인하고자 한다. 따라서, 구현된 Fuse 모델을 전력변환설비를 포함하는 LVDC 시스템에 연결하여 지락고장 위치에 따른 용단 특성을 관찰하였다.