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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.
Jiwon Choi(최지원),Chanjoo Kim(김찬주),Yunhee Ko(고윤희),Hyeji Im(임혜지),Yoo-Jin Moon(문유진),Reid McLain(뤼드 맥클레인) 한국컴퓨터정보학회 2021 韓國컴퓨터情報學會論文誌 Vol.26 No.11
이 논문은 데이터 큐잉 알고리즘과 의약품 빅데이터를 통해 약품 성분-성분 간의 정보와 질병-성분 간의 정보를 지원함으로써 의약품 다약제 복용 시 부작용이 발생 가능한 약물 정보를 사용자에게 제공하기 위한 시스템을 제안하고 구현한다. 또한, 의약품 성분에 더하여 복용이 금지된 의약품, 공급업체, 유통업체의 정보 등을 제공함으로써 의료 전문가뿐만 아니라 일반 사용자의 의약품 복용에 대한 불안감을 덜어줄 수 있다. 제공되는 대표적인 정보는 두 가지 약물 사이에서 일어나는 부작용, 특정 의약품의 주성분과 효능, 동일한 제약회사에서 제조된 의약품, 만성 질환 환자가 주의해야 할 약품 성분 정보이다. 앞으로, 희귀병 약이나 신약에 대한 정보를 수집하여 데이터를 업데이트하는 것이 필요하다. In this paper, we designed and implemented the integrated system to prevent adverse drug reactions of polypharmacy components in medicine by supporting component-component information and disease-component information, through data queuing algorithm and vast amounts of pharmaceutical big data. In addition, by providing information for drugs, drug components, prohibited drugs, as well as suppliers and distributors, it could help ease anxiety about taking drugs not only for health-care professionals but also for general users. The representative information provided were side effects between two drugs, main components and effectiveness of particular drugs, drugs manufactured by the same pharmaceutical company, and drug component information for patients with chronic diseases. The future work is to update the database by collecting information on rare & new diseases and new drugs.
A Rare Case of Methotrexate Induced Pancreatitis in Ectopic Pregnancy
Jiwon Choi,Mina Kang,Young Min Hur,Young Ju Kim,Sunwha Park Ewha Womans University School of Medicine 2023 EMJ (Ewha medical journal) Vol.46 No.2
Ectopic pregnancy (EP) refers to blastocyst implantation outside the uterine endometrium. EP is major cause of maternal morbidity and mortality. Treatment options include surgery, medical therapy with methotrexate, or expectant management. Methotrexate is the primary regimen used in cases of early, unruptured ectopic pregnancies. Most side effects of methotrexate are minor, including nausea, vomiting, abdominal discomfort, and photosensitive skin reaction. Serious side effects, including bone marrow suppression, and pulmonary fibrosis, are invariably observed when methotrexate is administered in high doses with frequent dosing intervals, in chemotherapeutic protocols for malignancy. These side effects are uncommon with the doses used to treat ectopic pregnancies. Since cases of methotrexate-induced pancreatitis are rare, we report a case of pancreatitis in a patient with EP treated with methotrexate and expect to consider pancreatitis as a side effect of methotrexate in a patient with upper abdominal pain undergoing methotrexate chemotherapy.
3',4'-Dihydroxyl Groups in Luteolin are Important for Its Inhibitory Activities against ADAMTS-4
Jiwon Choi,정기웅,Jin-Kyoung Kim,Byung Ha Chang,Jee-Young Lee,김양미 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.9
A disintegrin and metalloprotease with thrombospondin domains (ADAMTS) are a member of peptidase and involved in processing of von Willebrand factor as well as cleavage of aggrecan, versican, brevican and neurocan. Among 19 subfamilies of human ADAMTS, ADAMTS-4 is a zinc-binding metalloprotease and is a famous therapeutic target for arthritis. It has been reported that a flavonoid luteolin shows inhibitory activity against ADMATS-4. In this study, we verified that luteolin is a potent inhibitor of ADAMTS-4 and probed the molecular basis of its action. On the basis of a docking study, we proposed a binding model between luteolin and ADAMTS-4 in which 3',4'-dihydroxyl groups in luteolin formed hydrogen bonding with ADMATS-4 and these interactions are important for its inhibitory activity against ADAMTS-4..
( Jiwon Choi ),( Myoung Kyu Lee ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Background: Acute exacerbations of chronic obstructive pulmonary disease (AECOPD) are important causes of hospital admission and mortality. We evaluated CAT score and mMRC as prognostic factors associated the readmission or mortality due to re-exacerbation of COPD within 6 months. Methods: Prospective study was enrolled 314 patients who hospitalized with severe AECOPD. We collected demographic, clinical and laboratory .findings at admission. Lung function was evaluated using the COPD assessment test (CAT) questionnaire, the modi- fied Medical Research Council (mMRC) dyspnea scale, and spirometry in the stable state. Results: The mean age was 72.2 ± 9.4 years (76.4% of male), and the rate of readmission within 6 months was 50.0% and 180-day-mortality rate was 18.2%.The baseline CAT score categorized into four groups (0-9, 10-19, 20-29, and 30-40) and mMRC was also categorized into 4 groups (0-1, 2, 3 and 4) as a dyspnea scale. The 180-day-mortality according CAT score was 0/11 (0%) 9/102 (8.8%), 30/146 (20.5%) and 18/55 (32.7%) and re-admission was 0/11 (0%), 20/102 (19.6%), 91/146 (62.3%) and 46/55 (83.6%) respectively. The 180-day-mortality according mMRC was 1/29 (3.4%), 25/158 (15.8%), 19/100 (19.0%) and 12/27 (44.4%) and re-admission was 2/29 (6.9%), 63/158 (39.9%), 70/100 (70.0%) and 22/27 (81.5%) respectively. CAT score (P < 0.001) and mMRC (P < 0.001) were significantly associated with both 180.day-mortality and readmission due to severe AECOPD in multivariate analysis and showed a good accuracy to predict the mortality and readmission due to severe AECOPD. Conclusions: Our study suggested that CAT and mMRC could be valid prognostic factors to identify patients at further risk of exacerbation and mortality so can be used in clinical practice for more appropriate management and follow up on patient with severe AECOPD.