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성윤경,이규태 朝鮮大學校 機械技術硏究所 2004 機械技術硏究 Vol.7 No.1
The paper presents the modeling and optimal control for the reduction of transverse vibration of simply supported beam under a moving mass. The equations of motion are derived by using assumed mode method. The coriolis and centripetal accelerations are accommodated in the equations of motion to account for the dynamic effect of the traveling mass. In order to reduce the transverse vibration of the beam, an optimal controller with full state feedback is designed based on the linearized equations of motion. The optimal actuator locations are determined with the evaluation of an optimal cost functional defined by the worst initial condition with the trade-off of controlled mode performance. Numerical simulations are performed with respect to various velocities and different traveling masses. Even if the velocity of the traveling mass reaches to the critical speed which can cause the resonance of the beam, the controller with two piezoelectric actuators shows the excellent performance under severe time-varying disturbances of the system.
성일용,류성호,신상훈,김욱규,김종렬,정인교,변기정 大韓顎顔面成形再建外科學會 2003 Maxillofacial Plastic Reconstructive Surgery Vol.25 No.1
The authors analyzed retrospectively the 60 patients with ameloblastoma who were treated at Department of Oral and Maxillofacial Surgery, Pusan National University Hospital from MArch, 1990 to December, 1995. The results obtained were as follows: There were 26 males (43.3%) and 34 females (56.7%). The peak age of patients was the third decade (41.7%). The majority of cases occurred in the mandible 93.3%, especially in the angle region (91.1%). Eighteen of 60 patients (30.0%) were associated with an impacted tooth, by impacted 3rd molar teeth (16.6%), molar (10.0%), and premolar and canine (3.4%) in order., Fifteen of 60 patients (25%) were associated with an odontogenic cyst, by dentigenous cyst(13.3%), odontogenic keratocyst(8.4%), and radicular cyst(3.3%) in order. Radiographically, there were 32 unilocular types(54.2%) with average age of 24.9±10.8 years, 14 multilocular types(23.7%) with average age of 35.7±17.7 and 13 mixed types(22.0%) with average age of 41.4±15.8. Histopathologically, there were 42 follicular types(70.0%) with average age of 33.7±15.1 years and 18 plexiform types(30.0%) with average age of 26±14.6. Conservertive treatment was performed in the 33 patients(55.0%) and their average age was 25.2±13.9 years and radical treatment in the 27 patients(45.0%) and their average age was 39.3±41.8. Overall recurrence rate was 10%. A consistent correlation between the age of the patient and the radiographic or histologic type of mandibular ameloblastoma was observed. There was a tendency for ameloblastomas of the follicular type to show a multilocular or mixed appearance and for those of the plexiform type to show a unilocular appearance.
위 MALT 림프종에서 다발성 림프절 전이로 오인된 동시성 림프절 결핵 1예
김성은,김규종,김도현,송준영,문대성,장리라,유찬희,문원,박무인,박선자,김영옥 고신대학교의과대학 2008 고신대학교 의과대학 학술지 Vol.23 No.2
28세 남자가 내시경적 점막절제술을 통해 저등급 위MALT 림프종으로 진단되었다. 병기설정을 위해 18F-FDG PET 검사를 시행하였고 우측 쇄골상부, 우측상/하부 기관주위, AP window 부위에 강한 섭취가 관찰되어 전이성 림프절로 판단하였다. 그러나, 우측 쇄골상부 림프절에서 시행한 절제생검에서 만성육아종성염증소견이 관찰되었고 조직의 결핵 중합효소연쇄반응에서도 양성 반응을 보였다. 2개월간 항결핵제의 사용 후 시행한 추적 컴퓨터단층촬영 검사에서 림프절 크기의 감소를 보여 최종적으로 위 MALT 림프종에서 광범위 림프절 전이로 오인된 동시성 림프절 결핵으로 진단되었다. A 28-year-old man was diagnosed as gastric MALT lymphoma in diagnostic EMR (endoscopic mucosal resection). He subsequently underwent an 18F-FDG PET. 18F-FDG PET showed intense multifocal uptake in right supraclavicular, right upper and lower paratracheal, and AP window areas that was considered radiologically to represent widespread metastatic lymphadenopathy. Excisional biopsy of a supraclavicular lymph node, however, revealed chronic granulomatous lymphadenitis with a positive reaction of Tb-nested PCR. After antituberculosis treatment for 2 months, a follow-up CT scan showed complete resolution of the lesions. Intense 18F-FDG uptake could be due to an infectious process such as synchronous tuberculous lymphadenitis. Therefore, this could mimic a malignant condition such as lymphoma with extensive lymph node metastasis due to a false-positive finding, which may lead to a misdiagnosis.
로봇의 3D 물체인식을 위한 Vision Algorithm
성윤경,이규태 朝鮮大學校 機械技術硏究所 2006 機械技術硏究 Vol.9 No.1
The robot and machine vision technology has been developed for automatic fruit harvest. The most important subject in developing fruit harvesting robots is accurately to locate fruits on the given coordinate system. In this paper, we employ average color values (Red. Green, Blue), area, center position, compactness, perimeter and chain-coding information of specific regions, to detect and locate fruits in space. Especially, a new approach is presented to judge whether an extracted region is, overlapped or partially occluded by deleting or separating the region of an image.
트랙터의 로터리 驅動을 위한 PTO 시스템과 油壓驅動 시스템의 性能 試驗에 關한 硏究
成始興,崔圭洪 建國大學校 附設 自然科學硏究所 1993 建國自然科學硏究誌 Vol.4 No.-
엔진 회전속도 변동에 따른 PTO 회전수, PTO 토크, PTO 출력 및 연료 소비율을 측정하여 기계식과 유압식의 동력 특성을 비교, 분석한 결과는 다음과 같다. 1) 기계식, 유압식 모두 엔진의 회전 속도가 증가할수록 PTO 회전수는 증가하는 경향으로 나타났으며, 기계식이 변속단수 변동에 따른 엔진의 회전속도 폭이 안정적으로 나타난 대 반하여 유압식은 다소 크게 나타났다. 2) 엔진의 회전속도가 증가할수록 기계식, 유압식의 토크는 반비례 관계로 나타났다. 3) 최대 출력은 기계식의 경우 PTO 1, 2, 3단 순으로 나타난 데 비하여 유압식은 PTO 3, 2, 1단 순으로 나타나 PTO 변속 단수가 증가될수록 출력도 증가하는 것으로 나타났다. 4) 연료 소비율은 기계식, 유압식 모두 엔진의 회전수가 증가됨에 따라 연료 소비율은 어느 일정한 회전수 부근에서 최소가 된 후 다시 증가하는 경향으로 나타났다. 5) 유압구동 로터리의 효과적인 이용을 위해서는 유압펌프가 항상 고속으로 회전할 수 있도록 로터리는 어느 일정 회전속도를 유지시켜 작업하는 것이 필요할 것으로 판단되었다. 6) 유압식의 경우 유압펌프의 회전속도가 증가함에 따라 출력 및 연료 소비율이 향상되는 성으로 나타나 기계식에 비하여 효율이 크게 뒤떨어지지 않아 실용화의 가능성이 큰 것으로 생각되었다. The speed of revolution, the PTO torque, the PTO output power, and the specific fuel consumption caused by the variation in the revolution of an engine speed were measured. Therefore, the overall dynamic performance of the hydraulic PTO system was compared and analyzed with that of mechanical PTO system. The results are summarized as follows : 1) Both RPM of the hydraulic PTO and that of the mechanical one increased linearly as the engine speed increased. The engine speed from the variation of a mechanical type was saftly and small changed, but that of a hydraulic type was high changed. 2) Both torques of the hydraulic PTO system and those of the mechanical one decreased linearly as the engine speed increased. 3) The maximum power of the mechanical PTO system was the highest at the first gear of the mechanical one followed by the second one and the third one. However, that of the hydraulic PTO system was at the third gear followed by the second one and the first one. It means that the output power of a hydraulic PTO system increased as the variable PTO gear was increased. 4) After the specific fuel consumption decreased gradually to the specific point, which was required the lowest fuel consumption, then it increased as the engine speed increased. 5) To utilize effectively the hydraulic drive system, this system needs always to be kept revoluting constantly at an engine speed for hydraulic pump to rotate at the high speed. 6) The output power and the specific fuel consumption were improved by using the hydraulic system as the revolution of the engine speed was increased. The performance of hydraulic system was not significant of that of mechanical system. Therefore a hydraulic PTO system, which is convenient for a machine attached it to control automatically, would be utilized in future.
일반 또래 아동과의 상호작용을 통한 정신지체아동의 언어 유형 분석
최성규,김홍도 한국특수교육문제연구소 2001 특수교육저널 : 이론과 실천 Vol.2 No.1
The purpose of this study was to analyze the language categories of children with mental retardation in the application of dynamic language programs. Three children with mental retardation were participated to analyze the language categones. The dynamic language programs were developed to apply between normal children and the subjects. Three normal children who were attending same classes with the subjects used the programs to interact with the three subjects. The investigation design without any research design was utilized for experimental research. Total ten sessions were applied. The time of each sessions was thirty minutes. The language categories based on B. F. Skinner's verbal behavior such as echoic, mand, tact, intraverbal, codic, and autoclitic were collected from thc three children with mcntal retardation when the three children interact with the three normal children responded from the normal children’s asking by thc language programs. The results were that: (a) language categories were analyzed by the programs; and (b) the most frequently language was intraverbal, and the second frequency of the language responses was autoclitic, howcver, the other four language categories were not presented. Thcrefore. this study concluded that the intraverbal is most important language cate당 ory for the children with mental retarded 본 연구의 목적은 정신지체아동과 또래아동과의 상호작용 프로그램을 적용하여 정신지체이동의 언어유형을 분석하고자 하였다. 언어유형은 B. F. Skinner의 Verbal Behavior 역동적 이론에 기초한 복제, 명령, 지칭, 상호, 기호, 자발언어 등이다. 프로그램 적용 방법은 역동적 방법을 이용하여 접근하였다. 연구대상은 초등학교 특수학급에 재학중인 정신지체아동 3 명이었다. 정신지체아동의 또래 아동과의 상호적용에서 나타난 언어유형은 상호언어와 자발언어였다. 상호언어와 자빌언어의 증감은 상호 영향을 미치고 있었다. 따라서 상호작용을 통한 언어지도 방안이 정신지체아동의 언어지도의 기초가 될 수 있음을 본 연구결과는 시사하고 있다.