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블록 분류와 적응적 필터링을 이용한 후처리에서의 양자화 잡음 제거 방법
이승진,이석환,권성근,이종원,이건일,Lee, Seung-Jin,Lee, Seok-Hwan,Gwon, Seong-Geun,Lee, Jong-Won,Lee, Geon-Il 대한전자공학회 2001 電子工學會論文誌-SP (Signal processing) Vol.38 No.4
본 논문에서는 블록 분류와 적응적 필터링을 이용하여 블록 기반 부호화에서의 양자화 잡음을 제거하는 후처리 방법을 제안하였다. 제안한 방법에서는 블록 분류, 적응적인 블록 간 필터링, 및 블록 내 필터링의 단계로 이루어진다. 먼저, 각 블록을 8x8 DCT 계수 분포에 따라 7개의 클래스로 분류하고, 인접한 두 클래스 정보에 따라 적응적인 블록 간 필터링을 수행한다. 그리고 에지 블록으로 분류된 블록에 대하여 에지맵을 이용한 블록 내 필터링을 수행한다. 실험결과로부터 제안한 방법이 기존의 방법에 비하여 객관적 화질 측면에서는 유사하지만, 주관적 화질 측면에서 보다 우수함을 확인하였다. In this paper, we proposed a postprocessing algorithm for quantization effects reduction in block coded images using the block classification and adaptive filtering. The proposed method consists of classification, adaptive inter-block filtering, and intra-block filtering. First, each block is classified into one of seven classes based on the characteristics of 8$\times$8 DCT coefficients. Then each block boundary is filtered by adaptive inter-block fitters according to the block classification. finally for blocks which are classified into edge block, intra-block filtering is performed. Experimental results show that the proposed method gives better results than the conventional methods from both a subjective and an objective viewpoint.
이승진,강봉화,조민현,Lee, Seung Jin,Kang, Bong Hwa,Cho, Min Hyun Korean Society of Pediatric Nephrology 2014 Childhood kidney diseases Vol.18 No.2
다형 홍반은 피부, 구강, 입술 및 생식기 등을 침범하는 급성 피부점막 질환으로 점막 침범 여부에 따라 다형 홍반 minor와 다형 홍반 major로 분류된다. 스티븐스-존슨 증후군과 독성표피괴사용해는 다형 홍반 major에 속하는데, 이들은 증상이 심하고 진행성이며 높은 사망률을 보인다. 코르티코스테로이드는 현재 다형 홍반의 치료제로 사용되고 있다. 저자들은 신증후군을 가진 소아 환자에서 경구 코르티코스테로이드인 데플라자코트를 사용하던 중 발생된 3개의 다형 홍반 증례를 보고하는 바이다. Erythema multiforme (EM) is an acute mucocutaneous disorder involving the skin, mouth, eyes, and genital organs. It is classified into EM minor and EM major according to the involvement of the mucosal membrane. Stevens-Johnson syndrome (SJS) and toxic epidermal necrosis (TEN) belong to EM major. Compared to EM minor, SJS presents with more severe and progressive symptoms, and has a higher mortality rate. Corticosteroids are used in the treatment of EM. We report three cases of EM (two cases of EM minor and one case of SJS) that developed during treatment with oral corticosteroid (deflazacort; $Calcort^{(R)}$) in children with nephrotic syndrome.
삼피질골의 분절성형 골이식을 통한 거골 거대 동맥류성 골낭종의 치료 1예: 증례 보고
이승진,이효범,김갑래,김동현,Lee, Seung-Jin,Lee, Hyobeom,Kim, Gab-Lae,Kim, Donghyeon 대한족부족관절학회 2021 대한족부족관절학회지 Vol.25 No.4
An aneurysmal bone cyst (ABC) can occur in many parts of the human body, but a primary ABC of the talus is extremely rare. ABCs are benign, but aggressively growing tumors that usually occur in the first two decades of life. Patients mainly complain of pain, limited movement of the involved joint or a palpable mass. Pain may worsen suddenly because of pathological fractures. If not treated properly, ABC has a risk of local recurrence, followed by the destruction of the joint and a significant functional deficit. While the complete removal of the bone tumor is essential, it is also important to treat the resultant bone defect after removal. The talus has an important part to play in weight-bearing. Therefore, an appropriate bone graft is required for large bone defects that occur after an ABC removal from the talus. We report a primary ABC of the talus in a 28-year-old male that was treated by curettage and a bone pillar pattern graft of autologous tricortical iliac crest bone. The patient had an excellent functional outcome with early weight-bearing, and there was no recurrence at 16 months of follow-up.
가죽나무 추출물의 꽃매미 유인효과, 항산화 활성 및 국소자극성시험
이승진,박승춘,Lee, Seung-Jin,Park, Seung-Chun 대한수의학회 2013 大韓獸醫學會誌 Vol.53 No.4
This study aimed to assess the attraction effect against Lycorma delicatula and antioxidant activity of hexane, chloroform, butanol and water fraction obtained from Ailanthus altissima methanol extract. The attraction effect of chloroform fraction showed the highest activity (47%) as compared to that of other fractions. In the DPPH radical scavenging activity, methanol and butanol fraction showed higher antioxidant activity than other solvent fractions. From the above results, the potential chloroform fraction was further performed by local irritation test in New Zealand white rabbits. In eye irritation test, chloroform fraction showed moderate irritant at high concentration 0.5 g/site/mL, but there was no eye irritation at low concentration (0.05 g/site/mL). In accordance with the Draize evaluation of skin irritation, the primary irritation index was calculated to 3.3 and 0.68 at high (0.5 g/site/mL) and low concentration (0.05 g/site/mL) causing moderate and mild irritation, respectively. On the basis of this study, Ailanthus altissima chloroform fraction could be safely considered to be a candidate of attractant against Lycorma delicatula.
접이식 직렬날개형 공중투하 무인비행체의 공력 모델링 및 시뮬레이션
이승진,이정민,안정우,박진용,Lee, Seungjin,Lee, Jungmin,Ahn, Jeongwoo,Park, Jinyong 한국시뮬레이션학회 2018 한국시뮬레이션학회 논문지 Vol.27 No.4
The aerial launching UAV(Unmanned Aerial Vehicle) mainly uses a set of folding tandem wings to maximize flight performance and minimize the space required for mounting in a mothership. This folding tandem wing has a unique aerodynamic problem that is different from the general type of fixed wing aircraft, such as the rear wing interference problem caused by the wing of the front wing wake and vortex, and the imbalance of the pivot moment applied to the front and rear wings when the wing is deployed. In this paper, we have modeled and simulated various cases through computational fluid dynamics based on the finite volume method and analyzed various aerodynamic phenomena of the tandem wing type aircraft. We find that the front wing shall be installed higher than the rear for minimizing the wake influence and the rear wing can be deployed faster than the front because of the pivot moment due to aerodynamic forces. Also, considering the pivot moment due to aerodynamic force, the rear wing can be deployed much faster than the front wing. Therefore, it is necessary to consider it when developing the wing deploy mechanism. 공중투하형 무인비행체는 비행성능의 극대화 및 모기체 탑재시의 소요공간 최소화를 위하여 접이식 직렬날개를 주로 사용한다. 이러한 접이식 직렬날개는 전방날개의 후류에 의한 후방날개 간섭문제, 날개 전개시 전후방 날개에 걸리는 피봇 모멘트의 불균형 등 일반적인 형태의 고정익 비행체와 다른 독특한 공기역학적 문제를 가지고 있다. 이에 본 논문에서는 유한체적법 기반의 전산유체역학을 통하여 여러 경우에 대하여 모델링 및 시뮬레이션을 수행하였으며 접이식 직렬날개 방식 비행체의 여러 공기역학적 현상에 대해 분석하였다. 그 결과 받음각 변화에 따른 전방날개에 의한 후류영향을 최소화하기 위하여 전방 날개를 후방날개보다 수직방향으로 높게 설치할 필요가 있었다. 또한 공력에 의한 피봇모멘트를 고려시 전방날개에 비하여 후방날개가 훨씬 빠른 속도로 펼쳐질 수 있으므로 날개 펼침 기구 개발 시 이에 대한 고려가 필요함을 확인하였다.
Phantom를 이용한 Precision의 측정과 서로 다른 DEXA System의 BMD 교차보정의 유용성
이승진,최유진,이평재,권영호,정은선,서길원,황승연,Lee seung un,Choi yu jin,Lee pyeong jae,Kwon young he,Jung sun sun,Seo kil won,Whang seung yeon 대한방사선사협회 2004 대한방사선사협회지 Vol.30 No.1
To know the Difference of BMD value actually measured by the Hologic equipment and the Lunar equipment that is the latest machine due to the acknowledgement for the difference of value when the follow-up test was performed by other different equipment aft
이승진,유주순,정수열,최용락 ( Seung Jin Lee,Ju Soon Yoo,Soo Yeol Chung,Yong Lark Choi ) 한국응용생명화학회 1997 Applied Biological Chemistry (Appl Biol Chem) Vol.40 No.2
A screening was performed to isolate the cellulose-producing microorganisms from vinegar in Korea. The isolated strain was identified as Acetobacter sp. with respect to physiological and biochemical characteristics and designated as Acetobacter CBI-2. Cellulose production of Acetobacter CBI-2 was equal with the well known cellulose-producing bacteria, A. xylinum. The result of separation on thin layer chromatography(TLC) was consistent with the degradation product of native cellulose. The presence of genes required for the cellulose biosynthesis in Acetobacter CBI-2 was confirmed by Southern hybridization.