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박진식,유왕근,정현숙,한종만,양경한,Park, Jin-Sik,Yoo, Wang-Keun,Jung, Hyun-Suk,Han, Jong-Man,Yang, Kyung-Han 대한예방한의학회 2008 대한예방한의학회지 Vol.12 No.3
The purpose of this study was to investigate the effect of aqua exercise on women 50 years of age or older with knee degenerative arthritis, and then examining the therapeutic value of aqua exercise in degenerative arthritis of the knee. The subjects of the study were 115 residents 50 years of age or older who had been diagnosed as degenerative arthritis of the knee by doctors from medical institutions and applied for the aqua exercise program in the Public Health Care Center in Suseong-gu in 2006 and 2007. Experiments were conducted to all the subjects with the application of the 8-week aqua exercise program (2 times a week, 50 minutes a time), designed in the study, and the differences before and after the aqua exercise were compared through questionnaires for measuring the state of the body such as the knee extension angles, weight, body fat, and abdominal obesity. The data was analyzed by t-test and the Wilcoxon method through SPSS 14.0 and the statistical significance level ${\alpha}$ was set at 0.05 and 0.01. The results of the study are as the following. First, In comparison of before and after the aqua exercise, there was improvement in the extension angle of the right knee(p<0.01), while there was some improvement in the extension angle of the left knee, it was not significant. Second, In comparison of before and after the aqua exercise there were statistically significant differences in weight(p<0.05), body fat ratio, and abdominal obesity(p<0.01). The results of this study showed that the aqua exercise program to female patients with knee degenerative arthritis significantly increased the extension angle of the knee. Therefore it is thought that aqua exercise is an effective meditating method to improve their symptoms of female patients 50 years of age or older
힐버트 변환을 이용한 디지털 모드형성기용 위상 천이기 설계
박진식(Jin-sik Park),서상규(Sang-kyu Seo),정봉식(Bongsik Jeong) 한국정보기술학회 2011 Proceedings of KIIT Conference Vol.2011 No.5
본 논문은 스파이럴안테나용 디지털 모드형성기에 적용할 디지털 위상천이기로서 힐버트 변환(Hilbert transform)을 이용하였다. 힐버트 변환된 신호는 입력신호의 모든 주파수 성분을 90° 위상천이 시키는 성질을 갖는다. 힐버트 변환은 콘벌루션 형태 혹은 FFT-IFFT 형태로 구현할 수 있다. 여기서는 FFT-IFFT 형태의 힐버트 변환 알고리즘에 대해서 원하지 않는 주파수 성분과 잡음에 따른 위상천이 특성을 분석하고, 다른 방식의 위상천이기와 비교하고자 한다. In this paper, Hilbert transform was used to digital phased shifter for digital mode-former in the input port of spiral antenna. All frequency components of input sinusoidal signal and its Hilbert transformed signal have a phase difference of 90 degree. Hilbert transform can be implemented by convolution or FFT-IFFT combination. The effects of unwanted frequency component and noise are analyzed with Hilbert transform based on FFT-IFFT combination and compared with simulation results of other type phase shifter.
한국인에서 안지오텐신 전환효소와 산화질소 합성효소의 유전적 다형성이 관동맥성형술 후 재협착에 미치는 영향과 유전자 다형성 간의 상호작용에 대한 연구
박진식(Jin Sik Park),최영진(Young Jin Choi),최수연(Soo Yeon Choi),성지동(Ji Dong Seong),채인호(In Ho Chae),김효수(Hyo Soo Kim),오병희(Byung Hee Oh),이명묵(Myung Mook Lee),박영배(Young Bae Park),최윤식(Yun Shik Choi),이영우(Young Woo 대한내과학회 2000 대한내과학회지 Vol.58 No.4
Background : Intimal hyperplasia and vascular remodeling are major mechanisms of restenosis after coronary artery angioplasty. Angiotensin II causes restenosis by stimulating cell proliferation and vascular constriction and nitric oxide prevents restenosis by inhibiting cell proliferation and stimulating vascular dilatation. Angiotensin converting enzyme (ACE) and nitric oxide synthase (NOS) are the main determinants of the activity of the angiotensin II and the nitric oxide. In this study, we tested whether the genetic polymorphisms of the ACE and the NOS gene are the risk factors of restenosis and whether the effect of the genetic polymorphisms in stent group is different from that in balloon angioplasty group. We also tested whether there are interactions among the polymorphisms. Methods : We determined ACE I/D polymorphism and NOS A/B and G/T polymorphism in 219patients (77 patients (81 lesions) in stent group and 142 patients (181 lesions) in balloon angioplasty group) who underwent PTCA and follow up coronary angiography in Seoul national university hospital from January 1996 to May 1999. Results : Restenosis (50% of reference diameter) was observed in 78/262(30%) lesions (18/81(22%) lesions in stent group, 60/181(33%) lesions in balloon angioplasty group). ACE DD genotype is the significant risk factor for increment of late luminal loss and loss index in stent group. In stent group, means of the late luminal loss and loss index of the lesions of the DD genotype are 1.12±0.61mm and 74.7±38.3% and those of the non-DD genotype are 0.72±0.77mm and 44.9±67.5% but DD genotype is not the risk factor for restenosis after balloon angioplasty. The restenosis rate, late luminal loss and loss index are not significantly different according to NOS polymorphisms. No significant interaction among the polymorphisms is observed. Conclusion : ACE DD genotype is a significant risk factor for restenosis after stent insertion but is not a risk factor for restenosis after balloon angioplasty in Korean. This result reflects the different mechanism of restenosis after stent insertion and balloon angioplasty. NOS polymorphisms are not associated with restenosis and no interaction between the polymorphisms is observed.(Korean J Med 58:402-410, 2000)
인터랙티브 시청자 참여 방송프로그램 포맷 제작과 수익성 관계에 대한 연구
박진식(Jin-Sik PARK) 동국대학교 영상문화콘텐츠연구원 2016 영상문화콘텐츠연구 Vol.11 No.-
최근 10년간 독일 ‘콜 티브이(Call TV: 인터랙티브 형태의 시청자 참여 방송 프로그램 포맷 형태) 산업은 연간 5조 규모의 시장을 형성하고 있다. 특히, 시청자들이 방송 프로그램에 유료로 참여함으로써 방송 프로그램을 통한 수익을 새로운 방송 프로그램 비즈니스로 활발하게 활성화되고 있다. 이러한 시점에서 국내에서 유일하게 엔데몰(Endemol)의 시청자 참여 방송 프로그램 포맷의 비즈니스 구성과 실질적인 국내사례를 통해서 시청자들의 참여가 제작영역과 그 외 방송제작 외 부분의 관계를 살펴보고자 한다. 다만, 특정 장르(상담 쇼)프로그램에 국한되어 있지만, 이러한 사례를 통해서 향후 다양한 장르로 인터랙티브 방송 프로그램의 수익성과 시청률을 담보할 수 있는 콘텐츠 개발을 위해서 유의미한 연구라 할 수 있겠다. There has been an increase in the format industry of Call TV (a format of interactive TV show) over the last decade with a scale of 5 trillion annual market. Especially, broadcasters are looking for new broadcasting program business through the audience participate in the pay-TV. This study must look at the relationship between production field (Front-end) and the part out of production (Back-end) through case study of the audience participation format business composition and the effective domestic case study of Endemol. It is relevant that Korean broadcasters will be obtainable profitability and viewer ratings through the program of a specific genre (consulting show as Call TV).
Speed Control of PMSM with Current Controller in Overmodulation Region
박진식(Jin-Sik Park),김학원(Hag-Wone Kim),윤명중(Myung-Joong Youn) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
This paper presents a study on a current control of a PM synchronous motor which is fed by two-level voltage source inverter in the high modulation index area. In order to increase dynamic response and extend speed limit caused by voltage limit, overmodulation method is generally used. The current control in overmodulation have voltage limit. So larger voltage command than voltage limit should be diminished. In this paper, the problem conventional normalization method is analyzed and New normalization method in overmodulation region is proposed.