H.264에서 다중참조 프레임을 이용한 효율적인 움직임 예측

김성은,한종기,Kim Sung-Eun,Han Jong-Ki 한국통신학회 2006 韓國通信學會論文誌 Vol.31 No.9C

H.264에서 다중참조 프레임을 사용한 움직임 예측 방법은 단일 참조프레임을 이용한 움직임 예측보다 더 많은 시간적 중복성을 제거하여 부호화 효율을 높이거나 채널에러에 강인하게 부호화하기 위해 사용된다. 하지만 다중 참조 프레임을 이용하여 움직임 예측을 하는 것은 단일의 참조 프레임을 이용하는 것보다 많은 계산량을 요구하기 때문에 비디오 인코더의 복잡도를 증가시키게 된다. 본 논문에서는 다중참조 프레임을 사용한 움직임 예측을 화질 열화 없이 적은 복잡도로서 가능하게 하는 알고리즘을 제안한다. 움직임 예측 절차의 복잡도를 줄이기 위해, 제안한 알고리즘에서는 연속되는 프레임 사이에 구성된 움직임 벡터맵을 이용하여 움직임벡터를 추정한다. 제안한 방식은 추정된 움직임벡터를 작은 탐색영역에서 보정하는 방식을 적용하기 때문에 기존의 방식들에 비해 적은 복잡도가 요구된다. 제안된 방법으로 추정된 움직임벡터는 각 참조프레임들에 대해 최적의 움직임 벡터를 효과적으로 추적하기 때문에 부호화 된 영상의 화질은 전 탐색영역 움직임 예측 알고리즘을 이용한 결과와 매우 비슷하다. 제안된 방식은 세가지 단계로 구성된다. (a) 연속되는 두 개의 프레임 사이에 벡터맵을 구성한다. (b) 벡터맵에 있는 요소벡터를 이용하여 시간적 움직임 벡터를 구성한다. (c) 마지막으로, 임시 움직임 벡터를 좁은 탐색영역에서 보정한다. 컴퓨터 실험을 통해 제안된 방식의 효율성을 입증하였다. 제안된 방식과 기존의 방식들과의 비교를 위해 H.264 부호화기에서 움직임 예측 모듈에 의해 소비된 CPU 시간을 측정하였다. 컴퓨터 실험을 통해 알 수 있듯이 제안된 방식에 의해 부호화된 영상의 화질은 기존 방식과 을 통해 얻은 영상화질과 거의 같으면서 알고리즘 복잡도는 크게 줄어드는 것을 볼 수 있다.

측두하악관절에서 발생한 골연골종과 활액막 연골종증

김성은,김재덕,Kim Sung-Eun,Kim Jae-Duk 대한영상치의학회 2002 Imaging Science in Dentistry Vol.32 No.1

Osteochondroma is a benign lesion of osseous and cartilagenous origin. It is a relatively common benign tumor of the skeleton, occurring most often in the metaphyseal region of long bone. However, it is rare in the facial bones. Reported foci in the mandible were the condyle, coronoid process, and symphysis region. Synovial chondromatosis is an uncommon benign condition of unknown etiology which affects the articular joints. Foci of cartilage develop through metaplasia in the underlying connective tissue of the synovial membrane. These cartilagenous foci and fragments may undergo calcification and ossification. We experienced 4 patients with abnormal appearance of mandibular condyle. This report describes 3 cases of osteocondroma and 1 case of synovial chondromatosis of the mandibular condyle with review of the literature.

Stage 3 플러스 징후를 동반한 미숙아 망막병증에서 일차 유리체강내 베바시주맙 주입술의 효과

김성은,임형택,이승규,Sung Eun Kim,Tyler Hyung Taek Rim,Christopher Seungkyu Lee 대한안과학회 2015 대한안과학회지 Vol.56 No.1

Purpose: To evaluate the efficacy and safety of primary intravitreal bevacizumab injection in stage 3 retinopathy of prematurity with plus signs. Methods: We reviewed retrospectively the medical records of 30 eyes of 16 patients diagnosed with stage 3 retinopathy of prematurity with plus signs treated with primary intravitreal bevacizumab injection between March 1, 2011 and February 28, 2013 and followed up for at least 9 months. Results: Mean gestational age was 26 + 4 weeks ± 11 days and mean birth weight was 822 ± 251.4 g. The locations of disease were zone II in 24 eyes and zone III in 6 eyes. Intravitreal bevacizumab injection was performed after the mean 1.3 ± 1 day after plus signs were detected. Mean postconceptional age at treatment was 38 + 2 weeks ± 16 days. Mean follow-up period was 16.6 ± 6.9 months. Plus signs started to regress after the mean 4.6 ± 2.3 days after injection and completely regressed after the mean 24.3 ± 12.4 days. Cataract extraction was performed in 1 eye due to a cataract that appeared not associated with the injection procedure, but was regarded as a treatment failure. There were no local or systemic complications. Conclusions: Primary intravitreal bevacizumab injection in stage 3 retinopathy of prematurity with plus signs demonstrated excellent short-term efficacy and safety. J Korean Ophthalmol Soc 2015;56(1):62-69

두 가지 유전적 변이가 동반된 선천성 적혈구조혈성 포르피린증 1예

김성은,이형근,Sung Eun Kim,Hyung Keun Lee 대한안과학회 2009 대한안과학회지 Vol.50 No.3

Purpose: Congenital erythropoietic porphyria (CEP) is a rare disorder inherited as an autosomal recessive trait, which is characterized by almost complete reduction of uroporphyrinogen III synthase (UROS) activity. The authors of the present study report a case of congenital erythropoietic porphyria with severe ocular involvement. Case summary: A 27-year-old male patient diagnosed with congenital erythropoietic porphyria was referred to our clinic with a history of ocular pain, and foreign body sensation in both eyes. Visual acuity was light perception in both eyes. Severe scarring of eyelids, corneal leukoma with neovascularization, total limbal deficiency and scleromalacia were observed in both eyes. Identification of the uroporphyrinogen III synthase (UROS) gene mutation revealed the patient had a compound heterozygote mutation at p.Q249X (c.745C>T) and p.L237P (c.710T>C) in exon 10. Conclusions: CEP is clinically characterized by severe cutaneous photosensitivity, hemolytic anemia and porphyriuria. In addition to these manifestations, the authors report a severe ocular involvement in a patient with CEP who had a compound heterozygote mutation at p.Q249X (c.745C>T) and p.L237P (c.710T>C) in exon 10.

위암 선별검사 현황

김성은,Sung Eun Kim 대한소화기암연구학회 2016 Journal of digestive cancer reports Vol.4 No.2

Gastric cancer is the fifth most common malignancy in the world and still remains the third and fifth leading cause of cancer death in male and female, respectively. In terms of the cancer survival, the survival of gastric cancer is low in the West with showed 5-year survival rates of 10-30%, whereas the survival rates in Asia is more than 50%. The reason of the higher survival rate from gastric cancer in Asia partially related with the availability of gastric cancer screening programs, however, the population-based screening for gastric cancer has been conducted just in Korea and Japan. Therefore, more effective method for detecting the gastric cancer is needed for countries without a population-based gastric cancer screening. Endoscopy is the most effective method for diagnosis of gastric cancer however, it requires a large infrastructure including a large number of endoscopic equipment and well-trained endoscopists. To overcome these problems, several noninvasive methods (such as serologic markers, biomarkers, cancer autoantibodies, and exhaled breath analysis) for diagnosis of gastric cancer screening are suggested. This review addresses the conventional methods and the emerging methods for gastric cancer screening.

회원작품 - 안산어린이집

김성은,Kim, Sung-Eun 대한건축사협회 1998 建築士 Vol.1998 No.7

공정 개선에 따른 사고저항성 CrAl 코팅 피복관의 내마모성 향상

김성은,이영호,김대호,김현길,Kim, Sung Eun,Lee, Young-Ho,Kim, Dae Ho,Kim, Hyun-Gil 한국트라이볼로지학회 2022 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.38 No.4

This paper investigates the enhanced wear performance of a CrAl coated accident tolerant fuel (ATF) cladding. In the wake of the Fukushima accident, extensive research on ATF with respect to improving the oxidation resistance of cladding materials is ongoing. Since coated Zr claddings can be applied without major changes to the criteria for reactor core design, many researchers are studying coatings for claddings. To improve the quality of the CrAl coating layer, optimization of the manufacturing process is imperative. This study employs arc ion plating to obtain improved CrAl coated claddings using CrAl binary alloy targets through an improved coating method. Surface roughness and adhesion are improved, and droplets are reduced. Furthermore, the coated layer has a dense and fine microstructure. In scratch tests, all the tested CrAl coated claddings exhibit a superior resistance compared to the Zr cladding. In a fretting wear test, the wear volume of the CrAl coated claddings is smaller compared to the Zr cladding. Furthermore, the coated cladding manufactured through the improved process exhibits better wear resistance than other CrAl coated claddings. Based on these results, we suggest that fine microstructure is attributed to a mechanically and microstructurally robust CrAl coating layer, which enhances wear resistance.

대학생의 정보활용능력 교수학습모형 개발에 관한 기초연구

김성은,이명희,Kim, Sung-Eun,Lee, Myeong-Hee 한국비블리아학회 2006 한국비블리아학회지 Vol.17 No.2

This research has been done to develope a curricular model for the Information Literacy Course as one of liberal arts courses in Korean universities. This curricular model had resulted from investigating the standards and models for Information Literacy at the 4 standards(ACRL in USA, CAUL in Australia ANZILL in Australia and New Zealand, and SCONUL in the United Kingdom), 5 syllabi for Information Literacy used by 5 American universities and 33 syllabi by 23 Korean universities. On the basis of these educational results of the Information Literacy syllabi, a learning-instruction model has come into being for the Information Literacy Course that includes 7 core areas : information sources, information need, information access. information analysis, information management, information transfer and communication, and information ethics.

소엽 Ethyl acetate 분획의 세포독성 평가

김성은,천현자,김일광,한두석,이현옥,안종웅,이미희,백승화,Kim Sung-Eun,Chun Hyun-Ja,Kim Il-Kwang,Han Du-Seok,Lee Hyun-Ok,Ahn Jong-Woong,Lee Mee-Hee,Baek Seung-Hwa 대한예방한의학회 2001 대한예방한의학회지 Vol.5 No.2

The Cytotoxic activity of the ethyl acetate soluble fraction of Perilla frutescens on human oral epithelioid carcinoma cell lines was evaluated by 3-(4,5-dimethylthiazol- 2-yl)-2,5-diphenyl-2H-tetrazalium bromide (MTT) colorimetric method. The light microscopic study was carried out to observe the morphological changes of cultured human oral epitheloid carcinoma cell lines (KB) These results were obtained as follows; 1. subfraction 1 of the ethyl acetate soluble fraction of perilla frutescens was shown significant cytotoxic activity (p<0.001) at 10-2 mg/ml concentration, this concentration was decreased the cytotoxic activity of 70.3% . 2. The comparison of IC50 values of various subfractions in human oral epithelioid carcinoma cell lines was exhibited that their susceptibility to these subfractions decreased in the following order ; subfraction 5 > subfraction 4 > subfraction 3 > subfraction 2 > subfraction 1 by MTT assay. In light microscopy, the subfraction 1 of the ethyl acetate soluble fraction of Perilla frutescens showed the highest cytotoxic activity. These findings suggest that subfraction 1 possessed the most cytotoxic constituents.

신생아 로타바이러스 감염 진단에서 효소면역법과 중합효소연쇄반응과의 비교

김성은,김미옥,박선영,정원조,마상혁,김윤정,김선주,Kim, Sung Eun,Kim, Mi Ok,Park, Sun Young,Jung, Won Jo,Ma, Sang Hyeok,Kim, Yun Jung,Kim, Sun Ju 대한소아감염학회 2000 Pediatric Infection and Vaccine Vol.7 No.1

Purpose : Rotavirus is a most common etiologic agent of pediatric gastroenteritis. The standard method to diagnose rotavirus infection was the detection of viral particles in specimens through electron microscopy. But it was complex. Enzyme immunoassay and latex agglutinin are preferred because they are relatively handy, inexpensive and take a short time, in comparison with electron microscopy. However, several reports have shown that the use of ELISA to diagnose rotavirus infection in neonates can result in false positive reactions. The main purpose of this study is to compare ELISA and RT-PCR in the diagnosis of neonatal rotavirus infection. Methods : Data presented in this study were obtained form 123 newborn babies in the nursery of the Fatima Hospital, Masan, Korea, form Jury to December, 1997. We obtained two samples of stool from each of the newborn babies and then performed the Rotazyme test and the RT-PCR. In the Rotazyme test, the results were interpreted according to visual findings. The samples were used for the RT-PCR test after at stock $-30^{\circ}C$ to identify rotavirus group A. The result of the two tests were compared. Results : The informations are divided into 73 males and females. Out of the total informations 15 were transferred from other hospitals. Their average gestational age was $38.5{\pm}1.6$ weeks. The average birth weight was $3134.8{\pm}539gm$. In the Rotazyme test, 75 samples turned out to be positive. Out of them, 55 samples(75.3%) were positive and 18 samples(24.7%) were negative in the RT-PCR. On the other hand, in the Rotazyme test, 50 samples turned out be negative. Out of them, 27 samples(54%) were positive and 23 samples(46%) were negative in the RT-PCR. Conclusion : Rotavirus infection in uncommon in neonates. The diagnosis based on visual findings using Rotazyme test has a disadvantage in the sense that it can result in false positive reactions and false negative reactions in the diagnosis of neonatal rotavirus infection.