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고속 Embedded Processor에서 EMI 최소화 회로
김성식,정의석,조경록,Kim, Sung-Sik,Cheong, Eui-Seok,Cho, Kyoung-Rok 대한전자공학회 1999 電子工學會論文誌, C Vol.c36 No.1
휴대용 통신장비를 비롯한 각종 전자기기는 고집적화 및 소형화 되고 있으며, 이러한 전자기기는 무수히 많은 원하지 않은 전자파를 발생시키고 있다. 이에 따라 EMI 영향을 최소화 하기 위한 연구가 요구되며, 본 연구에서는 전자기기를 구성하는 각 회로들의 반도체 설계 단계에서의 EMI발생 원인을 분석하여 병렬 버퍼의 출력 구동회로와 decoupling 커페시터를 이용하여 EMI를 최소화하는 회로를 제안한다. 이를 i8052에 적용하여 칩을 제작하고 측정한 결과 delta 전류는 1/3으로 감소하였고 EMI는 10dBuV 이상 개선된 결과를 얻었다. All kinds of electronic machinery including portable communication system are being smaller size and are used at high frequency. It generates a lot of unwanted noise signals called electromagnetic interface (EMI). This paper presents an analysis result of EMI generation in VLSI and propose new circuits to minimize of EMI using I/O driver with parallel buffer architecture and distributed decoupling capacitor in a chip. The proposed circuits are evaluated with i8052 MCU which is shown reducing of delta current 1/3 times and improvement of EMI more 10dBuV compared with conventional processors.
Photoaddition Reactions of p-Quinones to Conjugated Diyne
김성식,유동열,김애란,조인호,심상철,Kim Sung Sik,Yoo Dong Yeol,Kim Ae Rhan,Cho In Ho,Shim Sang Chul Korean Chemical Society 1989 Bulletin of the Korean Chemical Society Vol.10 No.1
Irradiation of solutions of p-quinones and conjugated diyne, 1,4-diphenylbutadiyne, with 350 nm UV light gave the photoproducts such as quinomethane in good yields (70-85%).
김성식,임시연,정풍만,Kim, Sung-Sik,Rhim, Si-Youn,Jung, Poong-Man 대한소아외과학회 2008 소아외과 Vol.14 No.1
From 1979 to 2006, fifty eight patients with esophageal atresia were treated by one pediatric surgeon at Hanyang University Hospital. We analyzed the clinical findings and outcome of these 58 patients. There were 30 males and 28 females. Their mean birth weight was $2,960{\pm}400g$ (1,170~4,020 g). The most common type of anomaly was Gross type C (49 patients; 84.5 %). There was no type B. Fifty-two patients underwent definitive surgery. Postoperative complications were as follows: anastomotic leakage in 17 patients (32.7 %), anastomotic site stricture in 15 (28.8 %), gastroesophageal reflux in 10 (19.2 %) and recurrent TEF in 1 (1.9 %). A total of 152 associated anomalies were detected from 48 patients (82.2 %). The cardiovascular system was the most commonly affected (30 patients with 46 anomalies). The VACTERL association was present in 14 patients (24.1 %). Operative mortality was 17.3 % including self-discharge patients after operation.
Lipo-PGE<sub>1</sub>의 투여경로가 흰쥐의 횡복직근피판의 생존률에 미치는 효과
김성식,변준희,유결,한기택,Kim, Sung-Sik,Byeon, Jun-Hee,Yoo, Gyeol,Han, Ki-Taik 대한성형외과학회 2005 Archives of Plastic Surgery Vol.32 No.1
The Transverse rectus abdominis musculocutaneous (TRAM) flap has been commonly used for autologous breast reconstruction. Despite these clinical usefulness, the TRAM flap is prone to partial flap or fat necrosis in especially pedicled flap. To improve flap survival, the surgical delay procedures and pharmacological treatments have been developed. In many studies for the pharmacological treatment, Lipo-$PGE_1$ has demonstrated a marked ability to improve flap survival and it's effect has been proved similar to surgical delay procedure. The purpose of this study is to determine the most effective route of Lipo-$PGE_1$ administration as a pharmacological treatment in TRAM flap of the rat. Fifty male Sprague-Dawley rats weighing 300-350 gm were divided into five groups, One week before flap elevation, Lipo-$PGE_1$($2{\mu}g/kg$) was injected three times in a week and than the left inferior epigastric vessel based TRAM flap ($5.0{\times}3.0cm$) elevated; group I: no procedure before flap elevation; group II: intraperitoneal injection; group III: intravenous injection; group IV: subcutaneous injection; group V: topical application. A flap was assessed at postoperative 7 days by comparison of flap survival rate, vessel counts(H-E stain), and vascular endothelial growth factor(VEGF) protein expressed by Western blot. The results demonstrated that the mean percentages of the flap survival area in group III were significantly higher than that of any other group(p<0.05). The vessel counts of all experimental groups were statistically higher than that of control group(p<0.05). Only in group III, the VEGF protein expression was increased significantly than control group and there are no difference in other experimental groups. In conclusion, the intravenous administration of the Lipo-$PGE_1$ is the most effective on flap survival, and the VEGF induced by Lipo-$PGE_1$ has some positive effects on new vessel formation and flap survival.
Photoaddition Reactions of Alkynes to Quinonoid Compounds
김성식,김애란,조인호,심상철,Kim Sung Sik,Kim Ae Rhan,Cho In Ho,Shim Sang Chul Korean Chemical Society 1989 Bulletin of the Korean Chemical Society Vol.10 No.1
UV irradiation of anthraquinone and diphenylacetylene in benzene gave 1:1 photoadduct (7) and cyclization product (8). The photoreaction of anthrone and diphenylacetylene in dichloromethane afforded the photooxidation products (7, 8, and 9) in air. The photoproduct (7) underwent the cyclization reaction during the purification by the column chromatography (silica gel). When irradiated with 350 nm UV light, the product (11) of benzil reacted with diphenylacetylene to give a photoadduct(12).
김성식,Kim, Sung-Sik 대한예방의학회 1979 Journal of Preventive Medicine and Public Health Vol.12 No.1
부산지역 산업장에서 근무하고 있는 근로자 32,786명을 조사대상으로 하여 환경요인이 고혈압에 미치는 영향을 구명할 목적으로 동년 10월까지 고혈압의 유병율을 조사하였다. 제조업에 근무하고 있는 근로자는 전 조사대상자의 72.4%였으며 연령별로는 20-29세군이 39.9%로 가장 많았으며 이들의 성별 분포는 남녀 모두 20-29세 군에서 가각 36.8%, 46.1%로 가장 근로자가 많은 연령층이였다. 고혈압증의 유병율은 15.9였고 가장 유병율이 높은 업종은 도 소매 및 음식, 숙박업으로 51.5였다. 이 유병율은 연령이 많아 질수록 높아지는 경향이 있었다. A survey was performed from April 1975 to Oct. 1978, on the high blood pressure of workers employed at industries in Busan area in order to seek for the environmental factors on blood pressure. The number of workers surveyed in the manufacturing industries occupied 72.4 percent of the total. By the age group of all workers, 39.9 percent belonged to the 20-29 year group. For the age distribution and sex of the workers, the highest frequency was found in the 20-29 year group in both sexes and was 36.8% and 46.1% in male and female, respectively. The prevalence rate of hypertension among the workers was 15.9. The industries showing the highest prevalence rate equivalent to wholesale, retail trades, restaurants, and hotels. This survey presented a tendency of increasing prevalence rate as the age increases.
자료구조 수업에서 온라인 자동평가용 문제해결 프로그래밍 문제은행 개발 및 적용
김성식(Seong-Sik Kim),오소희(So-Hee Oh),정상수(Sang-Su Jeong) 한국컴퓨터교육학회 2018 컴퓨터교육학회 논문지 Vol.21 No.6
본 연구에서는 교원양성 대학에서 정보과학적 문제 해결력의 기본이 되는 자료구조 강의를 수강하는 학생들에게 학습 동기를 부여하고 몰입도를 증가시킬 수 있는 방안의 하나로서, 문제해결 프로그래밍 자동평가 시스템을 적용하기 위해 자료구조의 주요 토픽별 문제 은행을 개발하였다. 자료구조의 주요 토픽에 적합한 프로그래밍 평가 문제은행 70여 문항을 개발하여, 이를 온라인 자동평가 시스템에 탑재하고, 실제 수업에 적용하였다. 수업 적용 후 결과에 따른 학습동기와 몰입도 등을 분석함으로써, 교원양성 대학에서 문제해결 프로그래밍, 자료구조 수업에서 활용할 수 있는 ‘학습 동기를 부여하며, 몰입하여 해결하는’ 교수-학습 콘텐츠와 활용방법을 제시하였다. This study is to propose a problem bank of problem solving programming using Online Judge System as one of the ways to motivate learners and increase for immersion to students who take Data Structure lecture that is the basis of problem solving ability using information science. In order to do this, we developed a question bank for each major topic in the Data Structure, by developing 70 problem solving programming problems suitable for the main topics of the Data Structure. By mounting it on an Online Judge System and applying to actual classes, and by analyzing the motivation for learning and the degree of immersion according to the result after the application of the lesson, we propose a teaching-learning contents and usage for problem solving programming and Data Structure classes at the teacher training university which give motivation for learning and immerse in problem solving programming.
공공투자 프로젝트에서 적정규모산정 방법에 따른 경제적 타당성분석 - 청소년 수련관 건립을 중심으로 -
김성식(Kim Sung-Sik),이상범(Lee Sang-Beom) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.12
A construction project have various characteristic different from other industry because are saved technology of several a division Especially, public projects that create a base of society alike youth complex project are spent a much of fund Therefore, a various effort to reduction of money and time are demanded<br/> The study arrange a problem in the feasibility analysis procedure of public construction project, having the presentation of basis information for our object, to analyze the economical feasibility and confirm rightness apply to economical feasibility analysis on the construction of youth complex