當歸水鍼이 鎭痛效果에 미치는 影響에 關한 硏究

朴快煥,姜成吉 慶熙大學校韓醫科大學韓醫學硏究所 1984 慶熙韓醫大論文集 Vol.7 No.-

특징 거리와 방향성을 이용한 필기체 수식 인식

강경완,이우선,정성환 국립7개대학공동논문집간행위원회 2004 공업기술연구 Vol.4 No.-

We propose the recognition method of hand written numerical formula using the feature distance and the directionality. The proposed method uses the real time concept that is characteristic of on-line hand written character recognition. First, it receives the pixel coordinates of a numerical formula from a tablet. Secondly, it achieves the separation process on the inputed formula. Thirdly, it supplies sequentially one completed mathematical formula unconcerned with notes order. Finally, using the pattern conformity of feature distance and directionality, we recognize a completed mathematical formula. In the experiment using 100 mathematical formulas, the proposed method showed the recognition rate of about 98%

방사선조사가 당뇨 백서의 치수조직에 미치는 영향

강호덕,황의환,이상래 대한구강악안면방사선학회 2005 Imaging Science in Dentistry Vol.35 No.1

Purpose : To observe the histopathological changes in the pulp tissues of mandibular molars in streptozotocininduced diabetic rats after irradiation. Materials and Methods : The male Sprague-Dawley rats weighing approximately 250 gm were divided into four groups: control, diabetes, irradiation, and diabetes-irradiation groups. Diabetes mellitus was induced in the rats by injecting streptozotocin. Rats in control and irradiation groups were injected with citrate buffer only. After 5 days, the head and neck region of the rats in irradiation and diabetes-irradiation groups were irradiated with a single absorbed dose of 10 Gy. All the rats were sacrificed at 3, 7, 14, 21, and 28 days after irradiation. The specimen including the mandibular molars were sectioned and observed using a histopathological method. Results : In the diabetes group, capillary dilatation was observed. However, there was no obvious morphologic alteration of the odontoblasts. In the irradiation group, generalized necrosis of the dental pulp tissues was observed. Vacuolation of the odontoblasts and dilatation of the capillaries were noted in the early experimental phases. In the diabetes-irradiation group, generalized degeneration of the dental pulp tissues was observed. Vacuolation of the dental pulp cells and the odontoblasts was noted in the late experimental phases. Conclusion : This experiment suggests that dilatation of the capillaries in the dental pulp tissues is induced by diabetic state, and generalized degeneration of the dental pulp tissues is induced by irradiation of the diabetic group.

특징 영역 기반의 칼라 얼굴 영상 인식

강영미,정성환 國立 昌原大學校 精報通信硏究所 1998 精報通信論文集 Vol.2 No.-

In this paper, a face recognition system is proposed, which extracts the feature region in a color face image an recognizes a face using neural net. First, we transform RGB color model into HSI and seek a facial region by hue component range. Next, using Wavelet transform, we remove unnecessary details and extract a feature region. Finally, we recognize the face of an extracted feature region using ART2 neural net. The proposed method does not require individual feature extraction because a feature region preserves its detailed information for each face. It can also process the information in Wavelet transform domain. Therefore, the proposed method can extract features efficiently in large image databases. In the experiment with 150 facial images, the proposed method shows about 93% recognition rate.

특허 및 기술정보의 연계 검색에 관한 연구

강윤희,궁상환 호서대학교 반도체제조장비국산화연구센터 2001 반도체장비학술심포지움 Vol.2001 No.-

최근 정보통신을 비롯한 다양한 분야에서 새로운 기술과 아이디어를 이용한 기술개발이 활발하게 이루어짐에 따라 창의적 연구결과에 따른 특허 출원도 급격히 증가하고 있다.본 논문에서는 사용자의 특허검색 과정에서 특허와 관련된 기술문서를 동시에 검색이 용이하도록 지원하는 방식을 개발하는 것을 목적으로 한다.특허 및 기술정보 연계 시스템은 신규 특허 문서에 대한 분류를 위해 주제별 주요용어를 추출하고 특허 문서와 유사한 기술 문서를 코사인 유사도 기법을 사용하여 유사도에 따라 기술 문서를 사용자에게 제공할 수 있도록 설계하였다.

Vision을 이용한 고정밀도 Solder Cream 인쇄기 개발에 관한 연구

강상철,허봉식,김민환 부산대학교 1995 生産技術硏究所論文集 Vol.48 No.-

The solder cream printer requires the high speed and high precision operation. In this paper, we developed a high precision solder cream printer using vision in PC-based developing environment. The most important part of this machine is the vision part that recognizes the fiducial mark of a PCB and that of a matal mask and repositions the PCB to match the former to the latter. In this paper, a multi-resolutional and hierarchial correlation method named HCR is explained as a high-speed matching method and a repositioning method and a repositioning data learning method are suggested and explained. Through experiments, it is verified that this machine has a 19 μm error tolerance in 5.578 seconds. Solder cream 인쇄기는 빠른 속도와 높은 정밀도를 요구한다. 본 연구에서는 PC환경을 기반으로 하여 vision을 이용하는 solder cream 인쇄기를 개발하였다. 이 장비의 가장 중요한 부분은 PCB의 기준마크와 metal mask의 기준마크를 인식하여 PCB를 metal mask와 정확히 일치하도록 위치보정하는 부분이다. 본 논문에서는 고속의 정합방법으로서 다해상도 영상표현법에 의한 단계적 정합방법인 HCR(hierarchial correlation) 방법을 설명하고, 또한 PCB의 패턴과 metal mask의 패턴이 일치되도록 위치보정하는 방법 및 이를 위한 데이터를 학습에 의해 구하는 방법을 제시하고 설명한다. 본 연구에서 개발된 시스템은 약 5.578초의 처리시간에 19μm이내의 허용오차를 갖는 것을 실험 및 분석을 통해 검증하였다.

풍력 발전 시스템의 피치제어

강상수,강승균,임종환,허종철 濟州大學校工科大學産業技術硏究所 1999 尖端技術硏究所論文集 Vol.10 No.1

Wind turbine system converts wind energy into electric energy. Since the velocity of wind is random in nature, control of the angular velocity of the blade is necessary in order to generate high quality electric power. The control of the blade can be divided into the stall regulation type and the pitch control type. The stall regulation type which utilizes an aerodynamic stall is simple and cheap, but it suffers from fluctuation of the resulting power. On the contrary, pitch control type is based on the fact that the torque of the blade can be changed by varying the pitch angle of the blade. It is mechanically and mathematically complicated, but the control performance is better than that of the stall regulation type. This paper derives a mathematical modeling of the wind turbine system, and suggests a pitch control algorithm. The validity of the algorithm is demonstrated with the results produced through sets of experiments.

지면판위 복수장애물 주위 유동장의 가시화 (Ⅱ)

강성환,김계현,이동환 울산대학교 1992 공학연구논문집 Vol.23 No.1

地面板위에 모양이 서로 다른 복수 장애물을 바람방향과 평행으로 배열한 후(Tandem Arrangement)액체4염화 티타늄은 관찰대상 표면에 직접 도색하여 2차원 및 3차원 유동장을 효과적으로 可視化하였다. 유동장의 動的特性, 즉 박리영역의 양상, 방출 후류의 모양이 구조물의 배치모양과 구조물 사이의 간격에 크게 영향을 받고, 慝히 박리영역 내부의 역유가 확인 되었다. Flow patterns around two-bluff cyliders in the tandem arrangements on a gound plane are effectively visualized using liquid titanium tetrachloride. As results, it was observed that the form of seperated lines on the ground plane and the shedding of vortices from two cylinders were varied with both the gap width anda pair of different cylinders.

상악 골절단 및 급속구개확장(SARME)을 이용한 술전 치성보상의 해소와 악교정 치험 2례 : REPORT OF 2 CASES

강상원,김명래,김기환,김한석,김채두 大韓顎顔面成形再建外科學會 2003 Maxillofacial Plastic Reconstructive Surgery Vol.25 No.4

This is to review the surgically assisted rapid maxillary expansion followed by orthodontic treatment for malocclusion with maxillary narrow-arch. Two patients who presented with narrow-arch maloccluson and transverse maxillary deficiency underwent a Lefort I osteotomy extending to the zygomatico-maxillary but-trees and splitting of the midpalates. Orthopedic expansion was initiated with one complete rotation 0.8㎜ of the expansion screw on the day, and followed by two quarter-turn 0.4㎜ each day thereafter untill the arch expanded to preplanned level. Changes of the mid-incisal gap space. intermolar width. incisal inclination, TMJ symptoms and reapse tendency were examined periodically. After the surgico-orthodontic leveling and alignment. pre-planned orthognathic surgeries (maxillary & mandibular osteotomies) were rendered to correct the maxillofacial deformites. Results:Intermolar width (IMW) was increased to 13㎜ within 20 days and the gap between to cen-tral incisors was declined to5-7^。. There were neither complaints nor signs of TMJ disorders during treatment. The amount of relapse was less than 0.5㎜ in a year. Therefore, the surgically assisted rapid palatal expansion(SARME) can be a pre-orthodontic option to gain the interdental space in narrow-arch malocclusion with crowding and to reduce the labial inclination of upper incisors without extraction of premolars.

결핵성 척추염에서 양측 접근법에 의한 전방척추융합술의 수술적치험 1예

강중식,조준,윤승환,문창택,장상근 건국대학교 의과학연구소 2001 건국의과학학술지 Vol.11 No.-

In the treatment of tuberculous spondylitis, posterior spinal fusion is more simple and safe procedures than anterior spinal fusion. We performed bilateral anterior spinal fusion with autologous iliac bone graft and concomitant with psoas muscle abscess drainage and antituberculosis drug. As a result, patient was possible early ambulation and he had no recurrence, no complication such as resorption of bone fragment and kyphotic angle change. This article describeds the advantage of bilateral anterior approach in tuberculous spondylitis wish psoas abscess.