Neural Network를 이용한 거리영상의 표면 특징 추출과 표면 분할 ( Range Surface Characterization and Segmentation Using Neural Networks )

김순백,김두영 대한전자공학회 1997 대한전자공학회 학술대회 Vol.1997 No.1

모멘트 기반형 신경망에 의한 거리 영상 분할 ( Segmentation of Range Image Using Moment-based Neural Network )

김순백,김근중,김두영 대한전자공학회 1997 대한전자공학회 학술대회 Vol.1997 No.1

SAR 영상에서 MRF 기반 도로 검출에 관한 연구

김순백,김두영 한국융합신호처리학회 2001 융합신호처리학회 논문지 (JISPS) Vol.2 No.2

본 논문에서는 스페클 노이즈를 포함하는 SAR 영상에서 도로망과 같은 선형 구조를 검출하기 위하여 하이브리드 특징 검출 방법을 사용하였다. 먼저 국소적으로 이웃한 영역에 대하여 평균 밝기 비율 또는 통계적 특성을 고려하여 국소적 에지를 검출하였고, 도로에 대한 많은 정보를 위하여 양 검출기로부터 검출된 응답을 결합하였으며, 결합된 에지 세그먼트 중 도로에 일치하는 세그먼트를 결정하고, 연결하여 완전한 도로망을 검출하였다. 본 논문에서 도로망의 검출 방법으로 도로에 대한 일반적인 사전 지식을 MRF 모델로 정의하고, 제안한 세그먼트의 상호 작용 포인터 프로세서에 의한 에너지 함수를 최적화하여 도로망을 검출하였다. In this paper, an estimation method of hybrid feature was proposed to detect linear feature such as the road network from SAR(synthetics aperture radar) images that include speckle noise. First we considered the mean intensity ratio or the statistical properties of locality neighboring regions to detect linear feature of road. The responses of both methods are combined to detect the entire road network. The purpose of this paper is to extract the segments of road and to mutually connect them according to the identical intensity road from the locally detected fusing images. The algorithm proposed in this paper is to define MRF(markov random field) model of the priori knowledge on the roads and applied it to energy function of interacting density points, and to detect the road networks by optimizing the energy function.

에지와 영역 정보를 이용한 거리 영상 분할

김순백,김두영 東亞大學校 附設 情報通信硏究所 1997 情報通信硏究所論文誌 Vol.5 No.1

This paper presents integrated neural net-based approach to segmentation of range image, which is used for recognition of 3-D objects. The proposed segmentation procedure consist of two-step NN. At first step, DPNN model extracts local surface features from input range image. The projection coefficient of surface fitting equation is determined by optimally projecting the local image intensity profile onto a set of moment-generating polynomials. Both the surface normals as well as surface discontinuity values can be obtained as liner combination of optimally projection coefficient. At second step, these features are used KSNN model to group image pixels into different surface patches through local interaction of the features. Thus, NN-based method is a useful description method of range image for the recognition of 3-D objects and we proved the usefulness of it in experiments

Range data의 표면분할과 파라메타 추출

김근중,김두영,김명기,김순백 東亞大學校 附設 情報通信硏究所 1993 情報通信硏究所論文誌 Vol.1 No.1

최근 컴퓨터 시각 분야에 기존의 영상 데이터가 아니고 range data가 이용되기도 한다. 본 논문에서는 range data를 이용한 3차원 물체 인식의 중간 단계로 표면 분할과 표면을 수식적으로 기술할 수 있는 파라메타 추출방법을 연구 하였다. range data의 특성을 이용하여 곡률 계산에 의해 표면을 몇개의 조각(patch)으로 분할하고 이를 수식적으로 기술하는 방법을 제시하였다. 표면의 특징점을 정확히 추출하기 위해 곡률 계산시 가우시안 평활화와 공간 scaling 기법을 도입하였고, 4가지 방향에 대한 곡률을 계산하여 jump 경계와 crease 경계를 찾은 후 이들을 폐곡선으로 연결하여 표면 조각을 얻었다. 표면 조각들은 labeling 기법에 의해 분리되고 각 표면 조각을 수식적으로 기술하기 위해 표면 근사화 기법을 사용하였다. 표면의 분할과 수식적 기술의 타당성을 확인하기 위해 복원 처리 결과를 검토 하였다.

대상포진 환자에서의 급성 동통 및 포진후 신경통에 대한 임상적 고찰

김도원,권순백,정상립,이석종 대한피부과학회 2000 대한피부과학회지 Vol.38 No.3

Background:Pain in the form of acute neuritis and postherpetic neuralgia is by far the most frequent and most debilitating complication of herpes zoster. The pain of acute herpes zoster may be severe, but it is usually transitory. Some patients, with the elderly at particular risk, go on to develop postherpetic neuralgia. Postherpetic neuralgia is often severe and, unfortunately, refractory to most forms of treatment. Objective:The purpose of this study was to compare the severity of acute pain and incidence of postherpetic neuralgia by age group, dermatomal distribution and the presence and absence of associated diseases. Methods:We observed the severity of initial pain, changes in severity of pain during treatment, and the incidence of postherpetic neuralgia in 105 patients with herpes zoster with the same therapeutic measures (systemic steroid, acyclovir, analgesics, and tricyclic antidepressant). And we compared them by age group (the young & middle age vs the old age group), dermatomal distribution(trigeminal, cervical, thoracic, and lumbosacral), and the the presence and absence of associated diseases respectively. And we also analyzed the relationship between the incidence of postherpetic neuralgia and the severity of initial pain. Results: 1. Sixty-six patients (63%) of the total number of subjects complained of initial `severe pain', and the incidence of initial `severe pain' was significantly higher in the old age group (78%) compared with the young & middle age group (48%). But, there was no significant difference by dermatomal distribution and the presence and absence of associated diseases. 2. The duration of pain was 2-4 weeks in 27 patients (26%), 1-2weeks in 26 (25%), more than 8 weeks(postherpetic neuralgia) in 24 (23%). 3. The mean comparative value of the severity of pain was 38% of initial pain after 3 days of treatment, 22% 1 week, 15% 2 weeks, 8% 4 weeks, and 5% 8 weeks, respectively. But, there was no significant difference in changes of severity of pain by age group, dermatomal distribution, and the presence and absence of associated diseases. 4. The incidence of postherpetic neuralgia was significantly higher in the old age group (35%) compared with the young & middle age group (11%). But there was no significant difference by dermatomal distribution and presence and absence of associated disease. And the incidence of postherpetic neuralgia was also significantly higher in the initial 'severe' pain group (33.3%) than in the initial 'mild' pain group (14.3%) and the `moderate' pain group (3.1%). Conclusions:Older patients with herpes zoster showed severer initial pain and a higher incidence of postherpetic neuralgia. But there was no significant difference in the severity of initial pain and incidence of postherpetic neuralgia by dermatomal distribution and the presence and absence of associated diseases. And patients with initial severe pain showed a higher incidence of postherpetic neuralgia than those with mild and moderate pain, respectively.

제50차 춘계학술대회 : 아토피 피부염 심포지움 ; 자유연제 2 : 청년기 지루피부염 환자의 아토피 증상 조사 및 혈중 IgE치와 호산구수 측정

권순백,김태훈,김도원,정상립 대한피부과학회 1998 초록집 Vol.36 No.10

구진성 점액증 2 예

김도원,전재복,장재원,권순백,정상립 대한피부과학회 2000 大韓皮膚科學會誌 Vol.38 No.8

Scleromyxedema is a rare fibromucinous disorder that is often difficult to treat and is associated with significant morbidity and mortality. Clinically, it shows white or flesh colored, dome-shaped waxy papules on the hands, arms, face, neck and upper trunk. There are proliferation of fibroblasts and mucin deposition in dermis and presence of serum paraproteins. It should be differentiated from scleroderma because of sclerotic skin changes. Patients were a 70 year old male and a 45 year old female. They showed multiple confluent or linearly arranged waxy papules on the head, neck and extremities. Sclerotic plaques were also seen. Abnormal findings were not detected in laboratory tests and bone marrow biopsy. Histologically, mucin deposition and marked proliferation of fibroblasts were seen in dermis. Therapy was performed with 200 mg/day of cyclophosphamide. Both patients showed good response and had no recurrence. The latter one had shown improvement of skin lesions but subsequently she developed leukocytopenia. Cyclophosphamide was stopped temporarily until the abnormal leukocytes count recovered. During therapy, mild hemiparesis developed. We could not find the cause of the symptom through physical examination and radiologic studies.

피부 과립세포성 육종 2 예

김도원,전재복,장재원,권순백,정상립 대한피부과학회 2000 大韓皮膚科學會誌 Vol.38 No.9

Granulocytic sarcoma (GS), also known as chloroma, is an extramedullary tumor of granulocytic lineage. It usually occurs in patients with acute myelogenous leukemia (AML), myeloproliferative disorder, or myelodysplasia but can develop in patients with no known hematologic disorder (isolated chloroma). The sites of predilection are bone and periosteum, and the next most common sites are soft tissues of the skin, kidneys, gut and lymph nodes. We report herein two cases of GS in a 36 year-old male and a 39 year-old female. The former had been treated for AML for 4 months before GS developed as an exophytic and multiple cutaneous masses on his left arm. In the latter, whose chief complaint was plum-colored nodules on her trunk, the initial diagnosis was malignant lymphoma. A follow-up after chemotherapy revealed that she had AML and reversely the final diagnosis of GS could be made for her skin tumor.

Range data의 표면분할과 표면 파라메타 추출 ( Surface Segmentation and Surface Parameter Extraction in Range Data )

김근중,김순백,김명기,김두영 한국통신학회 1994 한국통신학회 워크샵 Vol.- No.-