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An Efficient Implementation of LDPC Decoder with Partial Parallel Algorithm for DVB-S2 System
Suksoon Choi1,Minhyuk Kim,Jongtae Bae,Taedoo Park,Namsoo Kim,Jiwon Jung 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
In this paper, we investigate the encoding and decoding method of the irregular LDPC (Low Density Parity Check) codes that offer diverse coding rates from 1/2 to 9/10 defined in the Digital Video Broadcasting (DVB-S2) standard. We study the efficient memory assignment and the implementing method in the LDPC codes.
Jiwon Choi(Jiwon Choi),Keesin Jeong(Keesin Jeong),Haiyoung Jung(Haiyoung Jung) 한국화재소방학회 2022 International Journal of Fire Science and Engineer Vol.36 No.4
Dust and fine dust exist in various forms and can lead to various problems such as dust explosion and air pollution. To reduce them, recently, research on electrospray electric precipitation, among various dust collection methods, has been actively conducted. In this study, comparative analysis experiments were performed on microdroplet generation characteristics for direct and indirect charging methods of electrospray electric precipitation. A visualization device was fabricated to generate microdroplets, and microdroplets were photographed with a high-magnification camera according to each charging method. The size and number of microdroplets were then analyzed via ImageJ software.
Young Children’s Metacognition Expressed during Coding Play
Han Jiwon(Jiwon Han),Choi Younchul(Younchul Choi) The Pacific Early Childhood Education Research Ass 2023 Asia-Pacific journal of research in early childhoo Vol.17 No.3
The purpose of this study is to explore young children’s metacognition expressed during coding play. The children participating in this study consisted of 13 five-year children(6 males and 7 females) at H Kindergarten in S City. Various data, such as observation records, researcher’s own journals, and informal consultation meeting records were collected and analyzed. The results of this study are as follows: First, metacognitive planning can be further activated in coding play while children create their own meaning through judgment and selection. Second, children are engaged in monitoring the degree to which performance is progressing towards a desired goal. Third, metacognitive control actively appeared in coding play while children changed ways of conducting tasks. Fourth, children review task performance and evaluate the quality of performance in coding play. The results of this study are expected to help understand how young children’s metacognition appears in coding play, and further reveal the educational value of coding play that helps young children activate their metacognition.
A Longitudinal Study of Adult Patients with Staphylococcus aureus Bacteremia over 11 Years in Korea
Choi Seong-Ho,Lee Jeongsoo,Jung Jiwon,Kim Eun Sil,Kim Min Jae,Chong Yong Pil,Kim Sung-Han,Lee Sang-Oh,Choi Sang-Ho,Woo Jun Hee,Kim Yang Soo 대한의학회 2021 Journal of Korean medical science Vol.36 No.16
Background: The temporal changes in the Staphylococcus aureus genotypes causing S. aureus bacteremia (SAB) and the corresponding clinical changes over the last decade in South Korea are rarely investigated. Methods: A longitudinal study of adult SAB patients was conducted in a large referral hospital in Seoul, South Korea. Adult monomicrobial SAB patients were enrolled between August 2008 and December 2018. Genotyping was performed by multilocus sequence typing (MLST) and staphylococcal protein A (spa) typing. Trends in changes were identified by linear regression analysis. Results: Of 1782 adult SAB patients, the blood isolates of 1,778 (99.8%) and 1,634 (91.7%) were determined to be MLST and spa type, respectively. ST5 (–2.626%/year) and ST239 (–0.354%/year) decreased during the study period (P < 0.001 for both), but ST72 (2.009%/ yr)-and ST8 (0.567%/yr) increased (P < 0.001 for both). The most common genotype was changed from ST5 in 2008 (44.9%) to ST72 in 2018 (36.3%). Panton-Valentine leukocidinpositive spa-t008-MRSA (USA300) was found in 28.6%. Central venous catheter (CVC)-related SAB (–2.440%/yr) and persistent SAB (–1.016%/yr) decreased, but mortality and recurrence rates were unchanged. Conclusion: Over the last decade, the hospital clones ST5 and ST239 have been replaced by community genotype ST72. This was associated with decreased CVC-related and persistent SAB. Increased USA300 was observed in community and hospital settings. Further research is required to identify the reasons for the ST72 epidemic and predict the impending epidemic of ST8 strains, including USA300.
Determining the Existence of Objects in an Image and Its Application to Image Thumbnailing
Jiwon Choi,Chanho Jung,Jaeho Lee,Changick Kim IEEE Signal Processing Society 2014 IEEE signal processing letters Vol. No.
<P>In recent years, computer vision applications dealing with foreground objects are becoming more important with an increasing demand of advanced intelligent systems. Most of these applications assume that an image contains one or more objects, which often produce undesired results when noticeable objects do not appear in the image. In this letter, we address the problem of ascertaining the existence of objects in an image. In the first step, the input image is partitioned into nonoverlapping local patches, then the patches are categorized into three classes, namely natural, man-made, and object to estimate object candidates. Then a Bayesian methodology is employed to produce more reliable results by eliminating false positives. To boost the object patch detection performance, we exploit the difference between coarse and fine segmentation results. To demonstrate the effectiveness of the proposed method, extensive experiments have been conducted on several benchmark image databases. Furthermore, we have shown the usefulness of our approach by applying it to a real application (i.e., image thumbnailing).</P>
Analysis of a-IGZO channel layer deposited via Pulsed-DC sputtering
Jiwon Choi,Jaemin Kim,Eun-Chel Cho,Junsin Yi 한국진공학회 2021 한국진공학회 학술발표회초록집 Vol.2021 No.2
The characteristics of a-IGZO thin films deposited by Pulsed-DC magnetron sputtering and RF magnetron sputtering were analyzed. The effect of the characteristics of thin films on the electrical characteristics of TFT devices according to the sputtering method was investigated. It has been confirmed that the characteristics of the transistor fabricated using Pulsed-DC are better. This result will be helpful in the research on the fabrication of oxide semiconductors.
Jiwon Choi(최지원),Wooje Cho(조우제),Yoonhyuk Jung(정윤혁),YoungOk Kwon(권영옥) 한국지능정보시스템학회 2022 지능정보연구 Vol.28 No.1
최근 몇 년간 많은 인터넷 대기업이 인공 지능 기술을 기반으로 한 개인화 서비스를 제공하여 온라인 사용자를 끌어들이는 자체 콘텐츠 서비스를 제공하고 있다. 본 연구에서는 기업의 온라인 서비스 네트워크에서 콘텐츠 서비스의 역할을 분석한다. 네이버의 서비스 포트폴리오에서 전문 제작 콘텐츠로 특징지어질 수 있는 웹툰의 역할과 구글 서비스 포트폴리오에서 사용자 제작 콘텐츠로 구분될 수 있는 유튜브의 역할을 확인한다. 네이버와 구글 서비스 이용에 관한 설문 조사 데이터를 바탕으로 방향성 계량 서비스 네트워크를 분석한다. 온라인 서비스 네트워크에서 노드는 온라인 서비스를 나타내고, 노드 간의 관계는 포트폴리오 내의 특정 서비스를 순차적으로 사용하는 것을 나타낸다. 연구 결과, 웹툰과 유튜브 모두 내향중심성보다 외향중심성이 더 높다는 것을 알 수 있다. 즉, 콘텐츠 서비스는 기업의 양방향 네트워크에서 도착 서비스의 역할보다 시작 서비스의 역할을 수행할 가능성이 높다. 유튜브의 외향중심성과 내향중심성의 차이는 웹툰의 외향중심성과 내향중심성의 차이보다 상대적으로 적다. 구글의 서비스 포트폴리오에서 유튜브의 높은 중심성은 엔터테인먼트 위주였던 초기 역할에서 검색 플랫폼으로 성장하였음을 보여준다. In recent years, many Internet giants have begun providing their own content services, which attract online users by offering personalized services based on artificial intelligence technologies. This study investigates the role of two firms’ content services within the firms’ online service network. We examine the role of Naver Webtoon, which can be characterized as a professional-generated content, within Naver’s service portfolio, and that of Google YouTube, which can be characterized as a user-generated content, within Google’s service portfolio. Using survey data on viewers’ use of the two services, we analyze a valued directed service network, where a node denotes an online service and a relationship between two nodes denotes a sequential use of two services. We found that both Webtoon and YouTube show higher out-degree centrality than in-degree centrality, which implies these content services are more likely to be starting services rather than arriving services within the firms’ interactive network. The gap between the out-degree and in-degree centrality of YouTube is much smaller than that of Webtoon. The high centrality of YouTube, a user-generated content service, within the Google service network shows that YouTube’s initial role of providing specific-content videos (e.g., entertainment) has expanded into a general search service for users.
Jiwon Choi,Hyun Ju Kang,김성주,권태오,Seung-Il Jeong,Seon Il Jang 대한약학회 2013 Archives of Pharmacal Research Vol.36 No.7
We evaluated the antioxidant properties ofmulberry leaves extract (MLE) and flavonoids isolatedfrom MLE. MLE was prepared by extraction with methanol. Flavonoids were analyzed by high-performance liquidchromatography. Oxidative hemolysis of normal humanred blood cells (RBCs) was induced by the aqueousperoxyl radical [2,20-Azobis (2-amidinopropane) dihydrochloride,AAPH]. MLE contained three flavonoids in theorder quercetin (QC)[kaempferol (KF)[astragalin(AG). Oxidative hemolysis of RBCs induced by AAPHwas suppressed by MLE, AG, KF, and QC in a time- anddose-dependent manner. MLE and these three flavonoidsprevented the depletion of cystosolic antioxidant glutathione(GSH) in RBCs. AG had the greatest protective effectagainst AAPH-induced oxidative hemolysis and GSHdepletion in RBCs.
Imaging Characteristics of Perosomus elumbis in a Puppy
Choi, Sooyoung,Lee, Byungho,Lee, Byungdon,Seo, Jiwon,Park, Hyunyoung,Kwon, Kyunghun,Lee, Youngwon,Choi, Hojung The Korean Society of Embryo Transfer 2015 한국동물생명공학회지 Vol.30 No.4
A 4-day-old, male Poodle dog was presented with dull, depressed and exhausted activity after the birth. On physical examination, the puppy showed arthrogryposis, muscular atrophy and no movement of hindlimbs. Palpation on dorsum revealed an absence of lumbar and sacral vertebrae. On prenatal and postnatal radiography, lumbar vertebrae, sacrum and coccygeal vertebrae were not visualized. On ultrasonography, bilateral kidney and urinary bladder were observed. On computed tomography, there were no apparent abnormalities in the forelimbs, cervical vertebrae or head, while lumbar vertebrae, sacrum and coccygeal vertebrae were not observed. At necropsy examination, the liver, stomach, intestine, kidney and urinary bladder were normal. This congenital anomaly was consistent with Perosomus elumbis. Perosomus elumbis in dogs is a rare condition of unknown etiology. In this report, Perosomus elumbis was evaluated with radiography, ultrasound and computed tomography.