• Korean Journal of Acupuncture
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• 제22권3호
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• pp.27-40
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• 2005

Objective : The purpose of this study was to verify the effect of pressing at Kyeun-Jung$(G_{21})$, Gok-Ji$(LI_{11})$ and Zok-Sam-Li$(S_{36})$ with Si-acupuncture on the decreasing of blood pressure and headache on the stroke patients. Methods : This study was one-group pretest-posttest experimental design. The subjects of this study were 30 patients who were hospitalized in stroke center of hospital located in Ulsan from September 27, to November 12, 2004. They had over 160/90mmHg blood pressure but didn't take any hypotensive drugs. The instruments were the Si-acupuncture. the blood pressure and headache scale using Visual Analogue Scale(VAS). Results : 1. With administration of Si-acupuncture, the blood pressure intensity decreased statistical significantly(systolic blood pressure: t=13.310, p=0.000, diastolic blood pressure: t=11.788, p=0.000). After 30 minutes with administration of Si-acupuncture, the blood pressure intensity decreased statistical significantly(systolic blood pressure: t=15.130, p=0.000, diastolic blood pressure: t=12.479, p=0.000). 2. With administration of Si-acupuncture, the headache intensity not decreased statistical significantly'(t=0.372, p=0.712). After 30 minutes with administration of Si-acupuncture, the headache intensity decreased statistical significantly'(t=7.370, p=0.000) Conclusion : According to above, it was verified that the pressing at Kyeun-Jung, Gok-Ji and Zok-Sam-Li with Si-acupuncture was effective in decreasing of blood pressure and headache on the stroke patients.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 A
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• pp.164-166
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• 1999

In this study, dynamic analysis of Linear DC motor has been performed. Dynamic characteristic is carried out from coupling the electrical circuit equation and mechanical kinetic equation. Trust constant and circuit parameters are obtained by FE analysis and static characteristic experiment. From the previous results, dynamic analysis is performed and the appropriateness of analysed result is verified by comparing with experimental result.

• 한국결정성장학회지
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• 제20권1호
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• pp.7-11
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• 2010

단결정 실리콘 태양전지의 광학적 손실을 감소시키는 표면 텍스쳐링은 최종 셀의 효율을 향상시키기 위하여 매우 중요하다. 본 연구에서는 2-step texturing의 공정으로 기존의 텍스쳐링에서 이루어진 피라미드에 수 많은 sub-micrometer 사이즈의 구조를 형성시켰다. $AgNO_3$ 용액으로 웨이퍼 표면에 Ag코팅을 한 후, 그 웨이퍼를 다시 HF/$H_2O_2$ 용액으로 수십초 동안 식각을 거치게 된다. 결과적으로, 피라미드 위에 생성된 수 nm사이즈의 구조물들은 $AgNO_3$의 농도 및 식각 시간의 변화에 의해 그 크기와 굵기가 변화하는 것을 알 수 있었다. 웨이퍼의 표면이 2-step texturing에 의해 식각이 이루어지면 연잎의 거친 표면과 비슷해지고, 그 결과 평균 10% 이상의 반사율을 보이던 기존 웨이퍼에서 3% 이하의 낮은 반사율을 얻을 수 있었다. 이는 일반적인 텍스쳐링과 anti-reflection coating을 거친 웨이퍼의 반사율보다 낮은 결과이다.