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비디오 시퀸스에서 움직임 객체 분할과 VOP 추출을 위한 강력한 알고리즘
김준기,이호석,Kim, Jun-Ki,Lee, Ho-Suk 한국정보과학회 2002 정보과학회 컴퓨팅의 실제 논문지 Vol.16 No.2
비디오 객체 분할은 MPEG-4와 같은 객체기반 비디오 코딩을 위한 중요한 구성 요소이다. 본논문은 비디오 시퀸스에서 움직임 객체 분할을 위한 새로운 알고리즘과 VOP(Video Object Plane)추출 방법을 소개한다. 본 논문의 핵심은 시간적으로 변하는 움직임 객체 에지와 공간적 객체 에지 검출 결과를 효율적으로 조합하여 정확한 객체 경계를 추출하는 것이다. 이후 추출된 에지를 통하여 VOP를 생성한다. 본 알고리즘은 첫 번째 프레임을 기준영상으로 설정한 후 두 개의 연속된 프레임 사이의 움직임 픽셀 차이 값으로부터 시작된다. 차이영상을 추출한 후 차이영상에 Canny 에지 연산과 수리형태 녹임 연산(erosion)을 적용하고, 다음 프레임의 영상에 Canny 에지 연산과 수리형태 녹임 연산을 적용하여 두 프레임 사이의 에지 비교를 통하여 정확한 움직임 객체 경계를 추출한다. 이 과정에서 수리형태학 녹임 연산은 잘못된 객체 에지의 검출을 방지하는 작용을 한다. 두 영상 사이의 정확한 움직임 객체 에지(moving object edge)는 에지 크기를 조절하여 생성한다. 본 알고리즘은 픽셀 범위까지 고려한 정화한 객체의 경계를 얻음으로서 매우 쉬운 구현과 빠른 객체 추출을 보였다. Video object segmentation is an important component for object-based video coding scheme such as MPEG-4. In this paper, a robust algorithm for segmentation of moving objects in video sequences and VOP(Video Object Planes) extraction is presented. The points of this paper are detection, of an accurate object boundary by associating moving object edge with spatial object edge and generation of VOP. The algorithm begins with the difference between two successive frames. And after extracting difference image, the accurate moving object edge is produced by using the Canny algorithm and morphological operation. To enhance extracting performance, we app]y the morphological operation to extract more accurate VOP. To be specific, we apply morphological erosion operation to detect only accurate object edges. And moving object edges between two images are generated by adjusting the size of the edges. This paper presents a robust algorithm implementation for fast moving object detection by extracting accurate object boundaries in video sequences.
정부업무의 외부위탁비용에 관한 연구 : 계약이론의 관점에서
김준기(Jun Ki Kim),조일홍(Il Hong Cho),송하중(Hah Zoong Song) 한국행정학회 1999 韓國行政學報 Vol.33 No.4
정부는 공공부문의 효율성 향상을 위해 정부업무의 외부위탁을 과감하게 추진하고 있다. 본 논문은 공공서비스 업무를 외부에 위탁할 경우 발생하는 비용을 생산비용, 거래비용, 기회주의적 비용 등으로 유형화하여 계약이론(contract theory)의 관점에서 분석해 보고 이러한 비용에 영향을 미치는 주요한 요인을 분석하였다. 연구결과 정부는 위탁사업 선정에 있어서 위탁비용에 대한 체계적 고려를 해야하며 이러한 고려사항에는 해당업무의 산출물 또는 성과측정의 용이성, 경쟁 및 경합 가능성 그리고 자산의 특화여부(매물비용의 존재여부) 등을 포함시켜야 한다. 따라서 비용측면에서 위탁 대상사업 선정기준은 위탁관리비용을 포함한 총 위탁비용이 정부가 내부적으로 생산하였을 때 발생하는 비용보다 작아야 한다. 그리고 외부위탁을 활성화하기 위해서 정부는 정부계약제도의 내용을 수정하여 담당 공무원에게 재량권을 부여함과 동시에 사후 성과평가체계를 명확하게 하는 것이 중요하며 영국의 의무경쟁입찰(CCT)제도를 도입하여 행정기관의 자발적인 참여를 유도해야 한다.
단계 분리형 최소 자승법을 이용한 탄도 미사일의 발사지점 예측 연구
김준기(Jun-ki Kim),이동관(Dong-kwan Lee),조길석(Kil-seok Cho),송택렬(Taek-Lyul Song) 제어로봇시스템학회 2014 제어·로봇·시스템학회 논문지 Vol.20 No.4
This paper presents a method of ballistic missile launch point estimation using phase division least squares. The proposed algorithm employs smoothing to enhance estimation accuracy and generates functions of time for total velocity, flight path angle and heading angle, allowing extrapolation to estimate the launch point. Performance of the proposed algorithm is tested in conjunction with the extended Kalman filter and the Kalman filter.
한국농어촌공사 지사 조직의 효율성 및 성과평가의 비교 분석
김준기(Kim Jun ki),김성섭(Kim Seong sup),서상택(Seo Sang taek) 한국농식품정책학회 2017 농업경영정책연구 Vol.44 No.3
This study analyzed the technical efficiency of Korea Rural Community Corporation (KRC) branch offices from 2013 to 2015 and compared the efficiency with the performance evaluation of the same offices. For the study, input oriented Data Envelopment Analysis (DEA) approach was adopted because KRC is a public corporation depending on government budget allocation with output variable uncontrollable. Input variables included labor force and total cost and output variables included gross margin and area under control. The results showed that average technical efficiency of the branch offices ranged from sixty one percent to sixty eight percent during the period, which implied that the brach offices could increase technical efficiency by reallocating both inputs. In addition, the rankings between performance evaluation result and technical efficiency were not identical among branch offices. This meant that the performance evaluation system was not appropriate for increasing management efficiency. We suggested the mixed use of both measures to increase a mid- and longterm management efficiency and reach a short-term management goal.
소아와 성인에서 태선양 비강진의 임상 및 병리조직학적 차이에 대한 고찰
김준기 ( Jun Ki Kim ),이지연 ( Ji Yeoun Lee ),윤태영 ( Tae Young Yoon ) 대한피부과학회 2015 대한피부과학회지 Vol.53 No.9
Background: Pityriasis lichenoides, an inflammatory skin condition of unknown etiology affecting both children and adults encompasses a clinical spectrum between pityriasis lichenoides et varioliformis acuta (PLEVA) and pityriasis lichenoides chronica (PLC). Although reported to follow a more self-limiting course in children compared with adults, there are a few studies comparing pityriasis lichenoides in both age groups in Korea. Objective: The aim of this study was to evaluate the clinicopathological features, overall efficacy of treatments, and disease outcomes in children and adults diagnosed with pityriasis lichenoides. Methods: This was a retrospective study of pityriasis lichenoides at our center between January 2003 and December 2013. Clinical manifestations and histopathological features of 54 patients with pityriasis lichenoides were analyzed. We also evaluated the clinical course in children and adults according to Gelmetti’s classification. Results: In this study, 36 patients were children (mean age 11.6 years, range 3∼18 years) and 18 patients were adults (mean age 34.7 years, range 19∼55 years). Lesions on the face were observed more commonly in children (n=18, 50%) compared with adults (n=1, 5.5%). Of the clinical features, vesiculation, crust and pigmentary changes were significantly more common in children than in adults. After treatment, 12 children (33.3%) and 10 adults (55.6%) went into complete remission. Histopathological features were not significantly different between children and adults. They just showed the difference between PLEVA and PLC. Dyskeratosis, epidermal necrosis, intraepidermal red blood cell (RBC) trapping, and RBC extravasation in the dermis were more prominent in PLEVA than in PLC. By Gelmetti’s classification, disease duration was longer in children with the peripheral type (38.5 months) than in children with the diffuse and central types. In adults, the diffuse type lasted longer (24.5 months) than the central and peripheral types. Conclusion: This study suggests that, compared with adults, pityriasis lichenoides in children is more likely to follow an unremitting course, with more facial/acral involvement and pigmentary changes and a poorer response to conventional treatment modalities. Applying the Gelmetti``s classification, disease duration was longer in children with the peripheral type than other types. However, in adults, the duration was longer with the diffuse type. (Korean J Dermatol 2015;53(9):693∼699)
Blaschko선을 따라 두피에 도너츠 모양 탈모반으로 발생한 홍반루푸스지방층염
김준기 ( Jun Ki Kim ),최기화 ( Gi Hwa Choi ),이지연 ( Ji Yeoun Lee ),김미경 ( Mi Kyoung Kim ),윤태영 ( Tae Young Yoon ) 대한피부과학회 2015 대한피부과학회지 Vol.53 No.3
A 9-year-old girl presented with a 2-year history of doughnut-shaped hair loss on the frontal scalp, resembling the symmetric distribution of Blaschko`s lines. Physical examination showed an alopecic patch with mild scalp induration. Histopathology revealed lymphoplasmacytic infiltration of the perifollicular dermis and subcutaneous lobules with abundant mucin deposition, consistent with a diagnosis of lupus erythematosus panniculitis. Three cases of linear lupus erythematosus panniculitis of the scalp presenting as alopecia along Blaschko`s lines have been documented in Korean dermatologic literature. However, there have been no reports of doughnut-shaped alopecia until now. Herein, we present an interesting case of a pediatric patient with a unique feature of doughnut-shaped alopecia along Blaschko`s lines. (Korean J Dermatol 2015;53(3):235∼238)