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TMS320C67x 기반 병렬신호처리시스템의 설계와 성능분석
박준석(J. S. Park),전창호(C. H. Jeon),박성주(S. J. Park),이동호(D. H. Lee),오원천(W. C. Oh),한기택(K. T. Han) 한국정보과학회 1999 한국정보과학회 학술발표논문집 Vol.26 No.1A
본 논문에서는 고속신호처리를 위한 TMS320C67x 기반 병렬신호처리시스템의 구조를 제안하고 성능을 분석한다. 특히 신호처리부의 보드회로를 메모리의 구성 및 그에 따른 버스연결 방식 면에서 서로 다른 네 가지의 모델로 제안하고, 신호처리 분야의 대표적인 연산이 2D FFT를 사용하여 성능을 비교 · 분석한다. 이를 위하여 제안하는 시스템 상에서 2D FFT를 병렬로 처리할 수 있는 여러 가지의 방식을 제시하고, 네 가지 보드 모델의 지역메모리의 사용, 프로세서간 통신, 그리고 보드간 통신에 소요되는 시간을 척도로 하여 성능을 비교한다. 성능분석 결과 어느 한 모델이 절대적으로 우월하게 나타나지는 않았으나 시간적인 면에서의 성능과 구현 할 경우의 하드웨어 복잡도를 종합적으로 고려할 때 지역메모리와 공유메모리를 함께 가지고 있는 모델이 가장 바람직하다는 결론을 얻었다.
문병표(B. P. Moon),박준석(J. S. Park),오대식(D. S. Oh),전창호(C. H. Jeon),박성주(S. J. Park),이동호(D. H. Lee),오원천(W. C. Oh),한기택(K. T. Han) 한국정보과학회 1998 한국정보과학회 학술발표논문집 Vol.25 No.2Ⅲ
본 논문에서는 방대한 양의 데이터를 실시간으로 처리하기 위한 병렬 디지털신호처리시스템을 제안한다. 버스와 메모리의 구조가 다른 네 가지 신호처리부 모델을 제안하고 그들의 성능을 분석한다. 신호처리부의 분석은 소나 알고리즘을 실행하는데 소요되는 하드웨어 지연시간과 버스 지연시간의 합을 척도로 한 성능분석과 보드의 복잡도를 비교하는 방법을 통하여 이루어졌다. 성능분석한 결과, 지역메모리와 공유메모리를 함께 사용하는 모델이 가장 효율적인 것으로 나타났다.
Osteovit가 가토의 두개골 결손부 치유과정에 미치는 영향
위성신,한기택,임풍,조성필 大韓成形外科學會 1989 Archives of Plastic Surgery Vol.16 No.2
For many years, surgeons, bioengineers and related biomedical personnel have been striving to find a suitable material for the replacement of lost bone. Recently, Osteovit (purified collagen matrix of bovine origin, B. Braun, Melsungen AG) has been developed as a useful material for bone substitute. Implanted collagen material is absorbed itself by the enzymatic activity and phagocytosis of host tissue, and promotes the early ingrowth of vascularity and cell producing elements, and then induces the early healing of defects and new bone formation. The present study was designed to inveatigate the effect of Osteovit on the osteogenesis at the calvarial bone defect and to compare the osteogenetic effect of Osteovit with that of control and autogenous bone graft groups. In 25 rabbits, three full thickness bony defects measuring about 1 cm in diameter were made on the parietal bone of each rabbit and these bony defects were treated as followings and divided into three groups: 1) one hole as non-treated control group, 2) another hole as autogenous tibial bone grafted group and 3) the third hole as Osteovit treated group. Radiographic, macroscopic and histologic examinations were performed in 5 rabbits at 1, 2, 4, 8 and 12 weeks respectively after the operation. The results were as follows; 1. The control group began osteoid formation at 2 weeks. The new bone formation and initiation of lamellation was found at 4 weeks. At 8 weeks, the bone defect site was replaced partially by calcified and lamellated new bone. And then newly formed bone was converted into thin trabecular bone at 12 weeks. 2. The bone regeneration in the autogenous bone graft group showed more rapid and better than that in control and Osteovit treated groups. The newly formed bone was mainly compsoed of thick compact bone, like the surrounding normal cortical bone at 12 weeks. 3. In the early stage of Osteovit treated group, the osteoid formation and calcification were not rapid in comparison with that of bone graft group. But in the late stage, the extensive formation of osteoid, calcification and lamellae could be observed as a result of progressive absorption of Osteovit and on significant difference was found in healing rate between the Osteovit treated and bone graft groups. In summary, Osteovit promotes good bony regeneration comparable to autogenous bone graft when it is used in bone defect instead of bone graft, and can be used as a bone substitute.
임풍,조성필,한기택,이종건 大韓成形外科學會 1989 Archives of Plastic Surgery Vol.16 No.4
In the cleft lip patients, several anatomical, functional and embryological deformities in the midface are usually present. Among them, deformities of the ala, septal cartilage and maxillary hypoplasia are more prominent according to its degree of deformity. The complex nasal deformity associated with unilateral cleft lip is frequently exasperating as a surgical problem to those who attempt a primary or secondary correction. Numerous procedures were advocated for the correction of nasal deformity, but with general dissatisfaction of the results, it became obvious that no one procedure is the ideal one. Thomson presented a three-phase correction technique for the residual unilateral cleft lip nasal deformity in 1985. The authors used this procedure principally and added other procedures, such as alar cartilage repositioning by suture fixation techique, conchal cartilage graft and Z-plasty on lateral nasal vestibule. In both primary and secondary correction, the authors got a good result, so we present our techniques and cases with a review of literatures.
마흥수,임풍,안상태,한기택,오영환 大韓成形外科學會 1990 Archives of Plastic Surgery Vol.17 No.4
A prominent mandibular angle produces a characteristic quadrangular, coares and muscular appearance. Reduction of a prominent mandibular angle and partial resection of hypertrophic masseter muscle were frequently performed for cosmetic reasons. We discussed the complications and their causes and methods of prevention through the experiences of 87 patients of mandibular angle reduction from March, 1984 to September, 1989. The complications were divided into aestheic(asymmerty 3, undercorrection 1, secondary angle formation 2) and surgical(infection 2, subcondylar fracture 2, transient facial palsy 1, massive hemorrhage 2, trismus 10)
임진수,조성필,오영환,한기택,임풍 大韓成形外科學會 1991 Archives of Plastic Surgery Vol.18 No.2
Recently, as increasing traffic accidnets, facial trauma is confronted frequently. Although frontal sinus fractures are less common than other facial bone fractures, they can cause severe craniofacial injuries and also, untreated frontal sinus fractures can cause severe complications. When the extent of injury to the sinus is surveyed, each wall of the sinus must be evaluated individually and fractures of the anterior and posterior tables may necessitate surgery for reconstruction of anatomical alignment. And the importance of the patency of the nasofrontal duct in preventing compication in the injured sinus has been well documented clinically and experimentally. Authors have experienced 29 frontal fractures from 1984 to 1988 and performed various operative managements based on the facial bone CT and intraoperative findings. So we present the cases of the frontal sinus fractures with a review of literature.