그라프를 이용한 치태조절이 동기유발에 미치는 영향에 관한 연구

김성식,신형식,Kim, Sung-Sik,Sim, Hyoung-Shik 대한치주과학회 1989 Journal of Periodontal & Implant Science Vol.19 No.1

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.

부산지역 근로자들의 고혈압에 관한 조사

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.

Lipo-PGE₁의 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 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%).

선천성 식도 폐쇄증에 대한 임상적 고찰

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.

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).

방과후학교 효과성 평가를 위한 모형 탐색

김성식(Kim, Sung Sik) 한국방과후학교학회 2016 방과후학교연구 Vol.3 No.2

이 글에서는 학교 효과 연구를 통하여 발전되어온 학교 효과의 의미를 검토하고 방과후학교의 효과성을 측정・평가하기 위한 방법을 논의하였다. 먼저, 학교 효과의 개념을 가산적 효과, 상대적 효과, 차별적 효과 등 세 가지 측면에서 검토하였다. 다음으로 방과후학교 운영 목표를 고려하여 창의 인재로의 성장, 사교육 참여 여부(정도), 보호 및 돌봄 정도, 교육격차 해소 등을 산출(결과) 지표로 제시하고, 이와 관련된 가정 배경, 학교교육(정규 교육과정), 방과후학교의 구조적 관계를 모형화하여 방과후학교 효과성 측정‧평가모형으로 제안하였다. 구체적으로 보면, 방과후학교의 효과성을 파악할 수 있는 요소로서 산출지표에 대한 직접적 효과, 가정 배경 영향력의 완화 효과, 학교 기능의 확대 및 강화 효과 등을 제시하였다. 마지막으로 방과후학교 성과 평가모형을 적용하기 위한 조건으로서 대표성 있는 데이터 수집, 단위 학교에서의 활용 가능성, 관리‧지원 체제 구축 등을 논의하였다. This study has discussed the method to measure and evaluate effectiveness of after school programs, referring to the concept of school effect. The meaning of school effect has been reviewed from three aspects: additive effect, relative/individual effect, and differential effect. Based on the concept of school effect, the evaluation model of after school program was proposed. In the model, development of students’ creativeness, decrease of demand for private education out of school, providing care and protection, and supplement of educational gap were suggested as a goal and outcome of after school. And then, it is proposed that the effects of after school program should be analysed on three elements: direct effect on outputs, compensatory effect on socioeconomic background influences, and expanding effect of school function. Finally, conditions to apply the evaluation model was discussed.

차량 구동용 모터의 극/슬롯 및 토폴로지에 따른 전자계 성능 분석

김성식(Sung-Sik Kim),강승구(Seung-Gu Kang),장도현(DoHyun Jang),황영호(Young-Ho Hwang),정상용(Sang-Yong Jung) 대한전기학회 2022 대한전기학회 학술대회 논문집 Vol.2022 No.7

STS 304를 이용한 플라즈마 아크용접에서 용접부의 기계적 특성에 관한 실험적 연구

김성식(Sung-Sik Kim) 산업기술교육훈련학회 2011 산업기술연구논문지 (JITR) Vol.16 No.4

This research tried to find an optimum condition of plasma arc welding. To investigate the effect of welding travel rate, wire feed rate and welding current on weld metal, tensile strength, hardness and microstructure were evaluated under various welding conditions using austenitic stainless steel STS 304 plate with 3 mm thickness.