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Woosung Kim,Yoonyoung Jang,Youn-Hee Lim,Bung-Nyun Kim,Choong Ho Shin,Young Ah Lee,Johanna Inhyang Kim,Yun-chul Hong 대한예방의학회 2020 Journal of Preventive Medicine and Public Health Vol.53 No.1
Prenatal cadmium (Cd) exposure may be associated with attention-deficit/hyperactivity disorder (ADHD) in children. Therefore, the objective of this study was to examine the relationship between Cd exposure during gestation and ADHD at 6 years of age.
단조 증가 성질을 지닌 데이터 도메인에서의 집합 유사 시퀀스 매칭 방법
황우성(Woosung Whang),임효상(Hyo-Sang Lim) 한국정보과학회 2021 정보과학회 컴퓨팅의 실제 논문지 Vol.27 No.3
데이터 도메인이 가진 단조 증가 성질이란 시간이 흐름에 따라 도메인의 존재하는 값들이 사라지지 않고 증가하여 도메인이 확장되는 성질을 뜻한다. 본 논문에서는 단조 증가 성질을 가진 도메인에서의 효율적인 집합 유사 시퀀스 매칭 방법을 제안한다. 단조 증가 성질을 활용해 매칭 수행 시 발생하는 후보의 개수를 크게 줄이고, 매칭 수행의 시간을 감소시킨다. 제안하는 방법은 1) 단조 증가 성질을 활용하여 두 집합의 교집합 크기가 허용치 이상일 가능성을 미리 확인하고, 2) 공통 원소 존재 여부를 미리 파악하여 교집합 크기 예측의 정확도를 높임으로써 유사 시퀀스 매칭의 검색 범위를 줄여서 성능을 높일 수 있다는 장점을 가진다. 성능 평가 결과 제안하는 방법이 기존 방법에 비해 약 1.7배의 수행 시간 단축과 후보감축을 보인다. The monotonically increasing nature of a data domain means that the domain expands as new elements are added over time if elements already existing in the domain are never removed. In this paper, we propose an efficient set-based similar sequence matching method that uses the monotonically increasing property. Specifically, by using the monotonically increasing property, the proposed method considerably reduces the number of candidates generated during matching and reduces the processing time needed to perform the matching. The proposed method improves the similar sequence matching efficiency by reducing the search spaces for the matching as follows: 1) determining if two given sets are likely to be above the threshold by utilizing the monotonically increasing property, 2) determining if the intersection size is likely to be above the threshold with higher accuracy by checking for the existence of common elements in the two sets. According to the experimental results, we show that the proposed method reduces the processing time and the number of candidates by about 1.7 times compared to the existing method.
Kim, Woosung,Jang, Yoonyoung,Lim, Youn-Hee,Kim, Bung-Nyun,Shin, Choong Ho,Lee, Young Ah,Kim, Johanna Inhyang,Hong, Yun-Chul The Korean Society for Preventive Medicine 2020 예방의학회지 Vol.53 No.1
Objectives: Prenatal cadmium (Cd) exposure may be associated with attention-deficit/hyperactivity disorder (ADHD) in children. Therefore, the objective of this study was to examine the relationship between Cd exposure during gestation and ADHD at 6 years of age. Methods: As part of an ongoing cohort study (the Environment and Development of Children study), 479 mother-child pairs from Seoul, Korea were included for analysis between 2008 and 2011. The whole blood concentration of Cd was analyzed using atomic absorption spectrophotometry. The parents were surveyed about ADHD behaviors in their children at age 6. Multivariable linear regression models were used to investigate the relationship between prenatal exposure to Cd and ADHD at 6 years of age. Results: Increased prenatal Cd concentrations were associated with increased scores for ADHD for girls, but not for boys, at age 6. A 2-fold increase in the prenatal Cd level was significantly associated with a 22.3% (95% confidence interval, 11.6 to 34.1) increase in ADHD in girls at 6 years of age, as indicated by the linear regression model. Conclusions: Our results identified significant associations between prenatal Cd exposure and ADHD scores in 6-year-old girls.
우주현,임우성 이화여자대학교 의과학연구소 2014 EMJ (Ewha medical journal) Vol.37 No.2
Breast cancer is the second most common cancer in Korean women and its mortality rate has increased steadily. Although breast cancer is heterogeneous tumor, hormone receptor-positive tumors comprise about 75 percent of all breast cancers. Therefore endocrine therapy that works by targeting estrogen receptor is a pivotal treatment for breast cancers. There are selective estrogen receptor modulators, such as tamoxifen and raloxifene, aromatase inhibitors, such as anastrozole, letrozole and exemestane, fulvestrant and luteinizing hormone-releasing hormone agonists used in endocrine therapy. Endocrine therapy is effective in treating early breast cancer as an adjuvant therapy and metastatic breast cancer as a palliative therapy. Also in women who are at high risk for breast cancer, tamoxifen or raloxifene can prevent breast cancer. Studies for neoadjuvant endocrine therapy are emerging. Considering side effects of each drug and overcoming drug resistance are needed to maximize effectiveness of treatment and advance endocrine therapy.
터보직분사 가솔린 엔진에서 저속 조기점화 (LSPI) 방지를 위한 주요 인자 고찰
임기훈(Gihun Lim),시우성(Woosung Si),엄믿음(Midyeum Eum),노성훈(Seonghun Noh),김재진(Jaejin Kim),박문호(Munho Bak) 한국자동차공학회 2017 한국자동차공학회 학술대회 및 전시회 Vol.2017 No.11
Low speed pre-ignition (LSPI) is one of the difficult issue in the turbocharged gasoline direct injection (GDI) engine. Pre-ignition is a kind of heavy knock of which pressure rise starts before ignition by spark plug. High load/low speed condition at high ambient temperature has risk of going into LSPI which makes engine damage such as spark plug and piston and big accident. In this study, the effects of valve timing, start of injection, lambda, and ignition timing on knock/PI characteristics have been investigated to protect LSPI. Knock/PI intensity and frequency could be restrained by valve overlap increase, late injection, rich air/fuel mixture, and retarded ignition timing. Valve overlap increase was one of excellent method to suppress the knock/LSPI without torque reduction.