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RISS 인기검색어
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- 저자 : 박해균(Hae Kyoon Park) (검색결과 5 건)
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지대치 coping형태에 따른 overdenture하에서 하악 응력에 관한 유한요소법적 분석
박해균,정재헌,조규종,Park Hae-Kyoon,Chung Chae-Heon,Cho Kyu-Zong 대한치과보철학회 1991 대한치과보철학회지 Vol.29 No.3
This study was to analyze the displacement and the magnitude and mode of distribution of the stresses in the lower overdenture, the mucous membrane, the abutment teeth and the mandibular supporting bone when various abutment designs were subjected to different loading schemes. For this study, the two-dimensional finite element method was used. The models of overdenture and mandibe with the canine and the second premolar remaining, were fabricated. In the first design, a 1 mm space was prepared between the denture and the dome abutment with the height of 2 mm(OS). In the second design, a contact between the denture and the occlusal third of the dome abutment with the hight of 2 mm was prepared(OC). In the third design, a 0.5 mm space was prepared between the denture and 8 degree tapered cylindrical abutments with the height of 7 mm(TS). In the fourth design, a contact between the denture and the occlusal two thirds of the conical abutments with the height of 7 mm was prepared(TC). In order to represent the same physiological condition as the fixed areas of the mandible under loading schemes, the eight nodes which lie at the mandibular angle, the coronoid process and the mandibular condyle were assumed to be fixed. Each model was loaded with a magnitude of 10 Kgs on the first molar region (P1) and 7 Kgs on the central incisor region (P2) in a vertical direction. The force of 10 Kgs was then applied distributively from the first premolar to the second molar of each motel in a vertical direction (P3). The results were as follows: 1. The vertical load on the central incisor region(P2) produced the higher displacement and stress concentration than that on the posterior region(P1, P3). 2. The case of space between abutment and denture base produced higher displacement than that of contact, and the case of long abutment produced higher displacement than that of short abutment because of low rigidity of denture base. 3. The magnitude of the torque and vertical force to the abutment teeth and the stress distribution to the denture base was higher in the telescope coping than in the overdenture coping. 4. The vertical load on the central incisor region(P2) produced higher equivalent stress in the mandible than that on the posterior region(P1, P3). 5. The case of space between abutment and denture base produced better stress distribution to the farther abutment from the loading point than that of contact. 6. In case of sound abutment teeth, the type of telescope coping can be used, hilt in case of weak abutment, the type of overdenture coping is considered to be favorable generally.
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박해균,정재헌,Park, Hae-Kyoon,Chung, Chae-Heon 대한치과보철학회 1988 대한치과보철학회지 Vol.26 No.1
The purpose of this investigation was to analyze the color of natural teeth by means of the OFC-1001 DP colorimeter which could measure in Adams Coordinate System (L,a,b system). The subjects were the 164 persons (82 men and 82 women) ranged from the teen to the sixtieth who had come to infirmary of dental college, Chosun University. The colors of incisal third, middle third and cervical third of maxillary right incisor, maxillary right canine and maxillary right second premolar were examined after the teeth were cleaned, polished and dried. The data were analyzed statistically by means of SPSS (Statistical Package For the Social Science). The results were as follows. 1. The means of L(lightness), a (red chromaticity), b (yellow chromaticity) of all teeth were measured (Table 2,3,4). 2. The color of teeth was yellowish-gray or bluish-gray. 3. The L value and b value of the cervical third was greater than those of the incisal and middle third. 4. The L value of maxillary 2nd premolar was greater than those of maxillary incisor md maxillay canine. 5. The a & b values of maxillary canine were greater than those of maxillary incisor and maxillary 2nd premolar. 6. The average values of L,a,b of teeth between male and female were not significant. 7. The L values of teeth were decreasing and the b values of teeth were increasing as the age was increased, but there was no corelation between the a values and aging.
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박해균(Hae kyoon Park),김종석(Jong Seok Kim) 한국환경에너지공학회 2022 한국열환경공학회 학술대회지 Vol.2022 No.2
이전의 음식폐기물 처리 방식(사료화, 퇴비화)의 한계로 국내외에서 다양한 문제점이 발생되고 있습니다. 국내에서는 돼지열병 및 조류독감의 원인으로 지목되기도 하여 직접사료화 금지 등의 조치가 이루어 졌지만 음식폐기물은 계속적으로 발생 될 수밖에 없고, 발생된 움식폐기물을 적절하게 처리 가능한 기술이 요구되고 있습니다. 비츠로넥스택의 풀라즈마 저온탄화 및 열분해 기술은 처리 반응로의 온도를 저온으로 운전가능하며 기존 처리방식(건조 등)의 문제점인 처리부산물의 미부숙, 보관 및 재활용의 한계를 극복하고자 개발된 기술입니다. 질소(N2) 플라즈마 열원을 이용하여 직접 탄화하여 소각이 아닌 열분해방식으로 다량의 탄소 상태로 처리되어 처리 부산물의 재활용성을 극대화 하는 기술입니다. 조금 전까지 사람들이 섭취하던 께끗한 음식물 쓰레기를 자원화 하여 지구환경을 살리고 갈 곳이 없는 음식폐기물을 재활용 하여 인간의 삶과 지구환경을 더욱 윤택하게 하는 기술입니다. • 해당 기술 특징 1) 처리대상 : 일반음식폐기물, 생선뼈, 조개껍질류, 양파껍질류, 파뿌리 둥 2) 구성품 : 풀라즈마 발생기, N2 발생기, 냉각수 Tank, 분진 및 가스처리 장치류 동 3) CO2 발생 량 : 약0. 5% (열분해 설 비 특성) • 특허 1) 특허 제 10-1987334호 I 고온 플라즈마를 이용한 유기성물질의 탄화장치 및 이를 이용한 탄화방법 2) 특허 제 10-2279175호 I 공동형 비이송식 움극전방 텅스텐봉 삽입형 폴라즈마 토치 3) 특허 제 10-229 94 15호 I 고온 플라즈마를 이용한 배치식 복합온도 처리기 및 이의 배가스 처리 방법
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FBW 항공기의 DDV 구동장치에 대한 구동전류 고장 모니터 설계
남윤수(Yoonsu Nam),박해균(Hae Kyoon Park),안종민(Jongmin Ahn),최섭(Sup Choi),권종광(Jongkwang Kwon) 한국항공우주학회 2006 韓國航空宇宙學會誌 Vol.34 No.3
본 논문은 유압 공급 변에서는 2중으로 전기제어 면에서는 3중으로 다중화된 DDV 구동장치에 대한 구동전류 고장 모니터 설계에 관한 논문이다. 다중화된 신호들 가운데 어느 한 채널에 고장이 발생한다면, 이 신호는 정확히 감지되어야 하고, 시기적절하게 제거 되어야 하며, 남겨진 정상채널들은 그 기능이 재조정되어야 한다. 조종면 구동장치의 고장 모니터 설계는 비행체 역학, 비행제어법칙, 그리고 유압 구동장치 운통특성이 모두 고려된 통합적 관점에서 수행되어야 한다. MIL-F-8785C에서 규정하고 있는 고장에 따른 비행체 천이 응답 요구조건으로부터 조종면 구동장치의 고장이탈 한계를 결정하는 설계 방법이 제시되었다. This paper deals with a driving current fault monitor design methodology for a DDV actuation system which has a dual hydraulic power supply system, and triplex electric control capability. A fault existing among these redundant channels should be detected accurately and removed timely, and the remaining channels are to be reconfigured in order to compensate the role of a removed faulty channel. An integrated analysis on the aerodynamics, flight control laws, and DDV actuation system is essential for the design of an actuation system fault monitor. A method to define a fault transient boundary which specifies a maximum travel of an actuation system caused by the first faulty operation is proposed based on the top level requirement on the fault effect specified in MIL-F-878SC.
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증분 엔코더에서 발생하는 진동에 의한 에러와 해결방안에 관한 연구
남윤수(Yoon su Nam),박해균(Hae kyoon Park) Korean Society for Precision Engineering 2008 한국정밀공학회지 Vol.25 No.6
Incremental encoder is a common choice for measuring the rotational angle of an axis. It produces, however, some measurement errors, if some kinds of rotational vibration are occurred. Even by increasing the number of slits on the circular peripheral, these kinds of error can not be removed. It only decreases the probability of the error being generated by making the magnitude of encoder resolution smaller than that of the axial vibration. This paper investigates the error mechanism of incremental encoder and suggests a digital logic circuit that prevents the measurement error to happen.
RISS
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