43 research outputs found

    [개ꡐ 70μ£Όλ…„ 기념] λ„μ„œκ΄€ μ „μ‹œνšŒ 개졜 및 70년사 λ°œκ°„

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    μ„œμšΈλŒ€ν•™κ΅ 개ꡐ 70주년을 λ§žμ΄ν•˜μ—¬ ν•™λ‚΄μ—μ„œλŠ” λ§Žμ€ 기념사업듀이 κΈ°νšγƒ»μΆ”μ§„λ˜μ—ˆλ‹€. λ„μ„œκ΄€μ—μ„œλ„ 개ꡐ 70주년을 기념할 뿐만 μ•„λ‹ˆλΌ λ„μ„œκ΄€ κ°œκ΄€ 70주년을 κΈ°λ…ν•˜λŠ” μ „μ‹œνšŒλ₯Ό κΈ°νšν•˜μ˜€λ‹€. μ „μ‹œ μ£Όμ œλŠ” λ„μ„œκ΄€ 70λ…„! 세계λ₯Ό ν’ˆλ‹€λ‘œ μ •ν•˜μ˜€λ‹€. μ΄λŠ” μ„œμšΈλŒ€ν•™κ΅μ™€ ν•¨κ»˜ μ„±μž₯ν•΄μ˜¨ μ€‘μ•™λ„μ„œκ΄€ 70λ…„μ˜ 역사λ₯Ό λŒμ•„λ³΄λ©°μ„Έκ³„λ₯Ό ν’ˆκ³  미래둜 λ‚˜μ•„κ°€λŠ” λ„μ„œκ΄€ λͺ¨μŠ΅μ„ κ΅¬ν˜„ν•˜κ³ μž ν•¨μ΄μ—ˆλ‹€. λ˜ν•œ κΈ°λ…μ‚¬μ—…μ˜ μΌν™˜μœΌλ‘œ λ„μ„œκ΄€ κ°œκ΄€ 이후 70λ…„κ°„μ˜ 역사λ₯Ό μ •λ¦¬ν•˜μ—¬ ν›„λŒ€μ— μ „ν•˜κΈ° μœ„ν•΄ γ€Žμ„œμšΈλŒ€ν•™κ΅ λ„μ„œκ΄€ 70년사』 λ°œκ°„λ„ μΆ”μ§„ν•˜μ˜€λ‹€. 이번 개ꡐ 70μ£Όλ…„ 기념 μ „μ‹œνšŒμ™€ λ„μ„œκ΄€ 70년사 λ°œκ°„μ— λŒ€ν•œ μ „λ°˜μ μΈ 좔진 과정이 ν–₯ν›„ λ„μ„œκ΄€ 역사에 μžˆμ–΄ μ€‘μš”ν•œ 기둝이 되기 λ•Œλ¬Έμ— κ·Έ 쀀비과정을 λ‹€μŒκ³Ό 같이 μ •λ¦¬ν•˜κ³ μž ν•œλ‹€

    Synthetic and Biological Studies of Sphingosine-1-phosphate Analogues

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    Maste

    κ΅­λ―Όκ±΄κ°•λ³΄ν—˜κ³΅λ‹¨ μš΄μ˜κ²½ν—˜(The empirical review of national health insurance in Korea)

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    λ…ΈνŠΈ : μ •λΆ€κ°„ν–‰λ¬Όλ²ˆν˜Έ 11-1051000-000577-01λ³Έ λ³΄κ³ μ„œλŠ” μ˜λ¬Έλ³΄κ³ μ„œλ₯Ό μΆ•μ•½ν•˜μ—¬ μž‘μ„±ν•œ κ²ƒμœΌλ‘œ ꡬ체적인 λ‚΄μš©μ€ μ˜λ¬Έλ³΄κ³ μ„œλ₯Ό μ°Έκ³ ν•˜μ‹œκΈ° λ°”λžλ‹ˆλ‹€

    Chimera grid

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    μ΄ˆμŒμ† μ˜μ—­μ„ λΉ„ν–‰ν•˜λŠ” λ‘œμΌ“ 본체와 2개의 λΆ€μŠ€ν„°κ°€ λΆ€μ°©λ˜μ–΄ μžˆλŠ” 3λ‹¨ν˜• λ‘œμΌ“ μ£Όμœ„μ˜ μœ λ™μž₯을 수치적으둜 해석할 수 μžˆλŠ” μ••μΆ•μ„± Euler μ½”λ“œλ₯Ό κ°œλ°œν•˜μ˜€λ‹€. λ˜ν•œ μœ λ™μž₯ ν•΄μ„κ²°κ³Όλ‘œ 3λ‹¨ν˜• λ‘œμΌ“μ˜ 곡λ ₯ νŠΉμ„±μ—°κ΅¬λ₯Ό μˆ˜ν–‰ν•˜μ˜€λ‹€ 계산 κ²©μžκ³„ ν˜•μ„± 방법은 overlapping κ²©μžκ΅¬μ„± 기법 μ€‘μ˜ ν•˜λ‚˜μΈ Chimera 기법을 μ‚¬μš©ν•˜μ˜€λ‹€. 이 방법은 3λ‹¨ν˜• λ‘œμΌ“κ³Ό 같은 λ³΅μž‘ν•œ 물체 μ£Όμœ„λ‚˜ μƒλŒ€μš΄λ™μ„ ν•˜λŠ” 물체 μ£Όμœ„μ— μ–‘μ§ˆμ˜ 격자λ₯Ό 얻을 수 μžˆλ‹€λŠ” μž₯점이 μžˆλ‹€. 각 κ²©μžκ³„ μ‚¬μ΄μ˜ 정보 전달은 적용이 κ°„λ‹¨ν•˜λ©΄μ„œλ„ κ°•κ±΄ν•œ trilinear μ‚½κ°„ 방법을 μ‚¬μš©ν•˜μ˜€λ‹€. 곡간 μ΄μ‚°ν™”μ˜ λ°©λ²•μœΌλ‘œλŠ” λ­‰λšν•œ 물체 μ£Όμœ„μ— μƒκΈ°λŠ” κ°•ν•œ 좩격파λ₯Ό 진동없이 잘 포착할 수 μžˆλŠ” AUSMPW+ 기법을 μ΄μš©ν•˜μ—¬ μœ ν•œμ²΄μ λ²•μ„ μ μš©ν•˜μ˜€κ³ οΌŒ MUSCL 기법을 Minmod μ œν•œμžμ™€ ν•¨κ»˜ μ‚¬μš©ν•˜μ—¬ 고차의 곡간 정확도λ₯Ό μ–»μ—ˆλ‹€. 음적 λΆ€λΆ„μ˜ ν–‰λ ¬ ꡬ성은 van Leerκ°€ μ œμ•ˆν•œ FVS ν•΄λ²•μ˜ ν”ŒλŸ­μŠ€ μ„ ν˜•ν™” 행렬을 μ‚¬μš©ν•˜μ—¬ κ΅¬μ„±ν•˜μ˜€λ‹€. λ˜ν•œ 음적 λΆ€λΆ„μ˜ 계산을 μœ„ν•΄ Beam-Warming의 AF 기법이 μ‚¬μš©λ˜μ—ˆλ‹€. KSR-III와 H-2 λ‘œμΌ“μ— λŒ€ν•΄ Chimera κ²©μžκ³„λ₯Ό κ΅¬μ„±ν•˜κ³  κ°œλ°œν•œ μ½”λ“œλ₯Ό μ μš©ν•˜μ—¬ λ‘œμΌ“μ£Όμœ„μ˜ μœ λ™μž₯을 μœ λ™ 쑰건을 λ³€ν™”μ‹œμΌœ 해석을 μˆ˜ν–‰ν•˜μ˜€λ‹€. 또 이 해석을 λ°”νƒ•μœΌλ‘œ ν•˜μ—¬ λ‘œμΌ“λͺ¨λΈλ“€μ˜ 곡λ ₯κ³„μˆ˜λ₯Ό κ³„μ‚°ν•˜μ˜€κ³ , λ§€κ°œλ³€μˆ˜μ— λ”°λ₯Έ 곡λ ₯ κ³„μˆ˜μ˜ λ³€ν™” κ²½ν–₯을 μ‚΄νŽ΄λ³΄μ•˜λ‹€.The three-dimensional compressible Euler code was developed for the analysis of the supersonic flow field around 3-stage rocket system with boosters. Numerical simulations were performed at various angles of attack and Mach numbers. In order to analyze these flow fields, an overlapped grid system, called '01imera grid system', is applied to the 3-dimensional EuJer equation. This grid system is quite efficient for the analysis of flows around complex geometry and flows under relative solid body motion, so is very appropriate for the present research objects. Communications between overlapped grids is achieved by the trilinear interpolation method which is robust and easily applicable to any code. AUSMPW+ scheme is used for spatial discretization, and MUSCL interpolation with Minmod limiter is applied for a higher order spatial accuracy. The split flux Jacobian of van Leer's Flux Vector Splitting(FVS) algorithm is used for the matrix computation of the implicit part. Also Beam-Warming's approximate factorization(AF) scheme is used for the efficient calcuJation of the implicit part. Chimera grid scheme was applied to KSR-III and H-2 geometry under various flow conditions. Aerodynamic coefficients and their characteristics were examined from the numerical results.OAIID:oai:osos.snu.ac.kr:snu2000-01/102/0000004648/1SEQ:1PERF_CD:SNU2000-01EVAL_ITEM_CD:102USER_ID:0000004648ADJUST_YN:NEMP_ID:A001138DEPT_CD:446CITE_RATE:0FILENAME:Chimera_κ²©μžκΈ°λ²•μ„_μ΄μš©ν•œ_3λ‹¨ν˜•_λ‘œμΌ“μ˜_비점성_μœ λ™_해석.pdfDEPT_NM:기계항곡곡학뢀EMAIL:[email protected]:
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