윤이상의 주요음기법을 통하여 나타난 도교사상(Interludium A를 중심으로)

양윤선 ( Yun Seon Yang ) 한국피아노학회 2009 피아노음악연구 Vol.3 No.-

Isang Yun is one of the great artists from 20th century who combined East Asian art and philosophy to Western music, and produced a music that is performed by Western instruments. In Germany, he got the title of `The Most Important 56 composers in 20th century`, `Living 5th Composer in Europe`, and `The Most Important Composer in 20th century`. Isang Yun`s musics are considerable to European artists. His musics contain unique characteristics in which artists from Europe can not modify. Isang Yun who recognized Western and Eastern culture in a principle of music got spotlight from European musicians. Ideas Isang Yun focused on are Taoism, Buddhism, and `tone` concept from East Asia. He concentrated especially on Taoism. Idea of `Hauptton` which is basis of Isang Yun`s music originated from Eastern sound concept. Therefore, this thesis will be discussed on musical presentation and Taoism that are indulged in Isang Yun`s music through "Interludium A". This piece was created with creativity and unique characteristics of Isang Yun. His life in Korea and Europe, style of music during his life time, what is Taoism and balance of yin and yang, and analysis of hauptton in each parts will be discussed to prove the understanding and hidden meaning of "Interludium A".

Calabi-Yau Manifolds, Hermitian Yang-Mills Instantons, and Mirror Symmetry

Yang, Hyun Seok,Yun, Sangheon Hindawi Limited 2017 Advances in high energy physics Vol.2017 No.-

<P>We address the issue of why Calabi-Yau manifolds exist with a mirror pair. We observe that the irreducible spinor representation of the Lorentz group Spin(6) requires us to consider the vector spaces of two forms and four forms on an equal footing. The doubling of the two-form vector space due to the Hodge duality doubles the variety of six-dimensional spin manifolds. We explore how the doubling is related to the mirror symmetry of Calabi-Yau manifolds. Via the gauge theory formulation of six-dimensional Riemannian manifolds, we show that the curvature tensor of a Calabi-Yau manifold satisfies the Hermitian Yang-Mills equations on the Calabi-Yau manifold. Therefore, the mirror symmetry of Calabi-Yau manifolds can be recast as the mirror pair of Hermitian Yang-Mills instantons. We discuss the mirror symmetry from the gauge theory perspective.</P>

Effect of Al on the Microstructure and Mechanical Properties of Mg–Sn–Ca–Mn Wrought Alloy

Yun Feng,Yuanyuan Yang,Zongqi Xiao,Xianglong Meng,Guorong Zhou,Jinfeng Leng,Xinying Teng 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.6

Mg–Sn–Ca–Mn–xAl (x = 0,1.5 wt%) alloys with ultra-fine recrystallized grains were prepared by conventional extrusion(400 °C, 0.5 mm/s). Effects of aluminum (Al) on mechanical properties and microstructure of the Mg–1Sn–1Ca–0.5Mn(wt%) alloy were systematically investigated. By the addition of 1.5 wt% Al, the yield strength of the as-extruded alloysignificantly increased from 183 to 237 MPa. The as-cast alloys show a dendritic structure consists of α-Mg, (Mg, Al)2Ca,and CaMgSn phases. The as-extruded Mg–1Sn–1Ca–0.5Mn–1.5Al alloys exhibit a bimodal grain structure composed ofdynamic recrystallized (DRXed) fine grains and coarse unDRXed grains. Compared with Al free alloy, a lot of nano-scaleplanar Al2Caand rectangle shape Al8Mn5precipitated in the as-extruded alloy with 1.5 wt% Al. Meanwhile, the addition ofAl significantly strengthened alloys’ fiber texture with < 10–10 >//ED.

TGA 방법을 이용한 플라스틱과 하수·분뇨슬러지의 열분해 반응속도 연구

윤효숙,최성필,김성탁,원양수,신부영 嶺南大學校 環境問題硏究所 1997 環境硏究 Vol.16 No.2

요약문 도시 고형폐기물의 열분해 특성에 대한 기초 자료를 제시하고자 열중량분석기를 이용하여 가열속도를 실험변수로 하여 하수 및 분뇨슬러지와 5대 범용 플라스틱인 LDPE, HDPE, PP, PS 와 PVC의 열분해 반응속도인자 및 분해특성을 파악하였다. 활성화에너지는 가열속도에 상관없이 일정한 값을 나타내었으며 분해속도가 최고일때의 온도는 가열속도가 증가함에 따라 증가하였다. LDPE, HDPE, PP와 PS는 1단계 분해반응으로 350∼520 ℃에서 대부분이 완전분해되었으며, PVC는 2단계 분해반응으로 250∼550 ℃에서 분해가 진행되었다. 슬러지는 여러 단계의 분해반응으로 특정한 분해구간이 없이 전구간에 걸쳐서 분해가 진행되었다. PVC를 제외한 플라스틱은 완전분해되었으며, PVC는 약 10%의 잔류량이 있었고, 슬러지의 잔류량은 D 하수, S 하수, T 분뇨 슬러지의 순으로 43, 70, 28.5%를 나타내었다.Abstract The thermal decomposition of sewage/night soil sludge and LDPE, HDPE, PP, PS and PVC was studied by using a conventional dynamic thermogravimetric analyzer (TGA) in a flowing nitrogen environment at several heating rates between 5 ℃ and 40 ℃/min. The dynamic thermogravimetric analysis curve was analyzed to obtain the information on the kinetic parameters such as activation energy, reaction order, and Arrhenius preexponential factor. The activation energy keeps constant regardless of heating rates, and the temperature of he fastest decomposition increases with the heating rate. LDPE, HDPE, PP and PS were completely decomposed in the temperature range of 350∼520 ℃ including as the first step decomposition and PVC was decomposed in the temperature range of 250∼550 ℃ including the second step decomposition. Sludge was decomposed without specific temperature range as several decomposition step. Except of PVC, all plastics were decomposed completely. PVC keeps the remains of about 10%, and sludge keeps the remains of 43% for D sewage sludge, 70% for S sewage sludge, 28.5% for T night soil sludge.

레진모형근관에서 엔진구동형 및 수동형 ProTaper 파일로 근관성형 후 근관형태 변화에 대한 비교연구

양인석,강인철,황윤찬,황인남,오원만 大韓齒科保存學會 2005 Restorative Dentistry & Endodontics Vol.30 No.5

본 연구는 형태 및 재질이 동일한 엔진구동형 ProTaper 파일과 수동형 ProTaper 파일을 이용하여 레진모형근관을 성형한 후 근관형태 변화를 비교 분석하고자 시행되었다. 본 연구에서는 레진모형근관으로 총 40개의 J자와 S자의 근관형태가 재현된 ENDO-TRAINING BLOC을 사용하였다. 근관 성형 기구로는 엔진구동형 Ni-Ti 파일로 ProTaper^(TM), 수동형 Ni-Ti 파일로 ProTaper^(®) For Hand Use를 사용하였다. 사용된 레진모형근관과 파일의 종류에 따라 10개씩 4개의 그룹으로 나누어 근관성형을 시행하였다. 근관 성형 전 · 후 이미지를 스캐너 (Color scanner, UMAX Techologies, Inc., USA)를 이용하여 얻은 후, Photoshop 7.0 프로그램 (Adobe System Inc., USA)을 이용하여 이미지를 중첩하였다. 이미지 분석 프로그램 (Image-Pro^(®) Plus, Media Cybernetic, USA)을 이용하여 치근단 쪽에서부터 0, 1, 2, 3, 4, 5, 6 및 7 ㎜ 수준에서 근관 성형에 따른 근관의 내측 및 외측 폭경의 변화량, 근관 총폭경의 변화량, 근관 중심축의 변위량을 측정하였다. 또한 근관 성형 시간을 기록하였다. 두 기구 사이의 유의성 검정을 위해 독립 표본 t-검정을 시행하여, 근관 성형 시 수동형 ProTaper 파일에 엔진구동형 ProTaper 파일에 비해 근관 중심축의 변위가 유의하게 덜 일어나며 근관의 원래 형태를 더욱 잘 유지할 수 있지만, 근관 성형시간은 길어질 수 있다는 결론을 얻었다. The purpose of this study was to compare the canal configuration after shaping by ProTaper rotary files and ProTaper hand files in resin simulated canals. Forty resin simulated canals with a curvature of J-shape and S-shape were divided into four groups by 10 blocks each. Simulated root canals in resin block were prepared by ProTaper rotary files and ProTaper hand files using a crown-down pressureless technique. All simulated canals were prepared up to size #25 file at end-point of preparation. Pre- and post-instrumentation images were recorded with color scanner. Assessment of canal shape was completed with an image analysis program. Measurements were made at 0, 1, 2, 3, 4, 5, 6 and 7 ㎜ from the apex. At each level, outer canal width, inner canal width, total canal width, and amount of transportation from original axis were recorded. Instrumentation time was recorded. The data were analyzed statistically using independent t-test. The result was that ProTaper hand files cause significantly less canal transportation from original axis of canal body and maintain original canal configuration better than ProTaper rotary files, however ProTaper hand files take more shaping time.

에멀젼 연료의 성능평가에 관한 연구

양원호,이동원,김홍석,박윤범,현명택 제주대학교 공과대학 첨단기술연구소 2005 尖端技術硏究所論文集 Vol.16 No.2

Emulsified fuel (mixed fuels with a small quantity of water) is suggested as a way of simultaneously diminishing NO_(x) and particulate matter. It is, therefore, an eco-friendly fuel and economical energy source. In this research, a comparative analysis between diesel fuel and emulsified fuel on their characteristics and the performance was done.

초음파 트랜스듀서용 PZT-고분자 1-3-0형 복합압전체의 유전 및 압전특성

양윤석,최헌일,사공건 東亞論叢 1999 東亞論叢 Vol.36 No.-

In this study, piezoelectric composites with 1-3-0 connectivity have been studied. A piezoelectric ceramic PZT prepared by the Wet-Dry Combination method is used as a filler phase in mixture of the third filler phase and Eccogel polymer matrix. The density and stiffness of 1-3-0 type composites were decreased with increasing the third phase.

신장내 국소혈류량 조절에 대한 신교감신경의 영향

양훈모,민영기,김동진,송호연,송윤섭 순천향의학연구소 2001 Journal of Soonchunhyang Medical Science Vol.7 No.2

Control of blood pressure is affected by regulation of intrarenal blood flow. Renal sympathetic nerve simulation inhibits pressure-depressor mechanism of kidney. This antidepressor mechanism was known as happening to due to a decrease the blood supply of renal medulla. It is not known whether renal sympathetic nerve innervation of renal medulla is and it affects regulation of medullary blood flow. We tried to measure total renal blood flow(TRBF), cortical blood flow(CBF), papillary blood flow(PBF) by ultrasonic and laser Doppler techniques in Wistar rats during 3 kinds of renal sympathetic nerves stimulation. The simulation orders are tried randomly and each stimulation period is 15 minute. TRBF and CBF decreased at 1 Hz by 2 and 2%, 3Hz by 18 and 15%, 5Hz by 49 and 44%, respectively as similar to each other. But PBF increased by 1% at 1 Hz and 4% at 3 Hz, while it decreased by 4% at 5 Hz. Therefore, it seems superficial renocortical and total renal blood flows are closely regulated by renal sympathetic nerves with increasing vasoconstriction at 5 Hz, onthe other hand while medullary blood flow seems to be under strong local control, tending to offset neurogenic flows restrictions.

노즐형상비에 따른 디젤분무의 특성

양윤석,이창수,허종철 濟州大學校 産業技術硏究所 2001 산업기술연구소논문집 Vol.12 No.1

In this study. diesel spray characteristics has been conducted to investigate the effect on nozzle aspect ratio(L/D). A single hole nozzle which is 0.45mm in diameter and 2.78. 3.89. 5 in the nozzle aspect ratio is used. Injection pressure is 14MPa and ambient pressure are 0.1MPa and 3MPa. By nozzle aspect ratio. the disintegration process of a diesel spray was observed. The double flash method has been employed to visualize the developing process of the diesel spray.

Delphi방법을 이용한 일차의료 고혈압 진료지침 개발 및 적용

양윤준,홍명호 한국의료QA학회 1995 한국의료질향상학회지 Vol.2 No.1

background: Guideline for practice is useful because it can be the standard for assessment and way to improve quality. We need to take account of expert opinion and consensus as well as scientific evidences to develope practice guideline because it should be practical. Delphi method has been developed to gather opinions from experts fairly. This study was designed to develop practice guideline and apply it to practices as a method to improve quality in primary medical care. Methods: Hypertension(in adults over 18 years old) was selected as a target problem. Self questionnaires about management of hypertensive patients were developed by a researcher with advice of 11 experts. The questionnaires were designed to response as a 5 pont scale. The results of previous questionary were given to respondents in second and third questionnaires. If needed, the questionnaires were changed on the previous responses. The items with medium greater than or equal to 4 point in 1st and 2nd responses were accepted in guideline. The items with medium lesser than or equal to 3 point were questioned again about whether they can be excluded or not. The criteria for assessment was made with reference to guideline and applied to 85 hypertensive patients of 9 family practitioners. At 3 months after practice guideline had been given to family practitioners, performance of same practitioners was assessed with 36 new hypertensive patients. Results: 23 professors in family medicine, 22 family practitioners and 6 cardiologists. responded among 50, 50, 15 respectively. Practice guideline with 33 items was developed as a result of 3 times questionaires. The difference of responses between professors in family medicine, family practitioners and cardiologists was not significant. Performance of practice was improved in diagnosis, history taking about 6 fields, Jaboratory examination and decision making about time fo pharmaceutical prescription. It was not improved in physical examination, life style modification, method of pharmaceutical prescription, choice of initial antihypertensives and history taking about duration of disease and diet habit. It was decreased in history taking about psychosocial factors. The assessment scores were low in history taking, physical examination and life style modification before and after use of practice guideline. Conclusion: Practice guideline for hypertension could be developed by Delphi method. Performance of practice improved partially after use of guideline.