• 제목/요약/키워드: Stagnation

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A Experimental Study on the Field Application of Concrete with $CO_2$ Reduction Materials (탄소 저감형 재료를 활용한 콘크리트의 현장 적용성에 관한 실험적 연구)

  • Jeon, Chanki;Jeon, Joongkyu
    • Journal of the Society of Disaster Information
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    • v.9 no.2
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    • pp.128-136
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    • 2013
  • The current contractor for use in performance compared to the performance study of industrial byproducts. Due to the stagnation of the construction business and the rise of raw materials, the contractor of the cost savings and environmental issues, and present a variety of ways for research actively being. Through special about the compressive strength characteristics of the mixed concrete, carbonation resistance and chloride penetration resistance of this study, previous studies have been a lot of progress, industrial byproducts, fly ash and blast furnace slag concrete structures were applied to evaluate.

A bibliographic study on the external therapy of Acute Mastitis(乳癰Yu-ong) (유선염(乳腺炎) 의 한방(韓方) 외치법(外治法)에 대한 문헌적고찰(文獻的考察))

  • Chang, Sung-Hwan
    • Korean Journal of Korean Medical Institute of Dermatology and Aesthetics
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    • v.1 no.1
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    • pp.177-197
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    • 2005
  • Acute Mastitis(急性乳腺炎=乳癰) is an acute suppurative disease appearing in the breast. It is mostly caused by galactostasis, the stagnation of liver-qi(肝鬱) and stomach-heat(胃熱). It is mostly found in breast feeding women, mostly in primiparae. It usually appears in the third and the fourth weeks of postpartum. At the beginning in the chest there appear induration, distending pain, galactostasis, inversion to cold with fever followed by the enlargement of the masses, burning red, megalgia, not subduing of chills and fever, the accumulation of it to form pus. In the early phase it is advisable to follow the therapeutic principles of soothing the liver and clearing away heat, promoting lactation and subduing swelling. After the formation of pus it is advisable to cut radially and drain the pus. External Therapy(外治法) generally refers to all the methods to treat various diseases and symptoms with application of drugs and manipulation or together with proper instruments on the body surface except the method of taking medicine orally Acute Mastitis has been regarded as surgery or the method of taking medicine orally But, based on many bibliographies, acute mastitis was treated by external therapy. Thus through the historical bibliographic studies of external therapy about acute mastitis, this study was made to help the expanding of the methods of treating acute mastitis.

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Computation of Nonpremixed Methane-Air Diffusion Flames in Microgravity (무중력에서의 비예혼합 메탄-공기 확산화염의 전산)

  • Park, Woe-Chul
    • Journal of the Korean Society of Safety
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    • v.19 no.1
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    • pp.124-130
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    • 2004
  • The structure of the nonpremixed methane-air counterflow flames in microgravity was investigated by axisymmetric simulation with Fire Dynamics Simulator (FDS) to evaluate the numerical method and to see the effects of strain rate and fuel concentration on the diffusion flame structure in microgravity. Results of FDS for the methane mole fractions, $X_m$=20, 50, and 80% in the fuel stream, and the global strain rates $a_g$=20, 50, and $90s^{-1}$ for each methane mole fraction were compared with those of OPPDIF, an one-dimensional flamelet code. There was good agreement in the temperature and axial velocity profiles between the axisymmetric and one-dimensional computations. It was shown that FDS is applicable to the counterflow flames in a wide range of strain rate and fuel concentration by predicting accurately the flame thickness, flame positions and stagnation points.

Research Trends of Interstitial Lung Disease (간질성 폐질환의 연구 동향)

  • Son, Ji-Woo;Lee, Jung-Wook;Lee, Byung-Soon;No, Woon-Serb;Lee, Byung-Ju;Shin, Jo-Young;Lee, Si-Hyeong
    • Journal of the Korean Institute of Oriental Medical Informatics
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    • v.13 no.1
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    • pp.26-38
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    • 2007
  • Interstitial lung disease (ILD) is characterized by progressive scarring of the lung leading to restriction and diminished oxygen transfer. Clinically, the presenting symptoms of ILD are nonspecific (cough and progressive dyspnea on exertion) and are often attributed to other diseases, thus delaying diagnosis and timely therapy. In this study, I analyzed the 10 chinese papers of interstitial lung diseases(ILD). The etiology are body resistance weakness(本虛) and pathogenic factor prevailing(標實). The body resistance weakness(本虛) including deficiency of the lung(肺虛), deficiency of the kidney(腎虛), deficiency of the spleen(脾虛), deficiency of Qi and Yin(氣陰兩虛), pathogenic factor prevailing(標實) including stagnation of phlegm(痰濁), blood stasis(瘀血), noxious heat(熱毒). As an treatment aim at supplementing lung and kidney(益肺腎), resolving phlegm and blood stasis(化痰瘀).

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An Empirical Correlation for Critical Flow Rates of Subcooled Water Through Short Pipes with Small Diameters

  • Park, Choon-Kyung;Park, Jee-Won;Chung, Moon-Ki;Chun, Moon-Hyun
    • Nuclear Engineering and Technology
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    • v.29 no.1
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    • pp.35-44
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    • 1997
  • Critical too-Phase flow rates of subcooled water through Short Pipes (L 140039n) with small diameters (D$\leq$7.15 min) have been experimentally investigated for wide ranges of subcooling (0~199$^{\circ}C$) and pressure (0.5~2.0 MPa). To examine the effects of various parameters (i.e., the location of flashing inception, the degree of subcooling, the stagnation temperature and pressure, and the pipe size) on the critical two-phase flow rates of subcooled water through short pipes with small diameters, a total of 135 runs were made for various combinations of test parameters using four different L/D test sections. Experimental results that show effect of various parameters on subcooled critical two phase flow rates are presented in the form of graphs such as the dimensionless mass flux ( $G^{*}$) versus the dimensionless subcooling ( $T_{sub}$$^{*}$) curve. An empirical correlation expressed in terms of a dimensionless subcooling is also obtained for subcooled two-phase flow rates through present test sections. Comparisons between the mass fluxes calculated by present correlation and a total of 755 selected experimental data points of 9 different investigators show that the agreement is fairly good except for very low subcooling data obtained from small L/D (less than 10) orifices.s.s.s.

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Clinical study on 1 Case of Patient with Obstruction of the retinal artery (網膜中心動脈閉鎖 患者 1例에 對한 臨床的 考察)

  • Lee, Jun-Seong;Ryu, Hyeon-Sin;Seo, Hyeon-Sik;No, Seok-Seon
    • The Journal of Korean Medicine Ophthalmology and Otolaryngology and Dermatology
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    • v.14 no.2
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    • pp.224-230
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    • 2001
  • In the Clinical study on 1 Case of Patient with Obstruction of the retinal artery, the results were as follows. 1. Obstruction of the retinal artery is acute disease that vision isdiminished fastly and become a blindness. 2. It belong to the cathegory of Pock Maeng(暴盲) in Oriental Medicine. 3. The causes of Obstruction of the retinal artery were the yin-deficiency of liver and kidney, the stagnation of vital energy and blood stasis, the abundance of phlegm-heat, the yang-deficiency of spleen and kidney, the yin-deficiency of spleen and kidney, the nonfastness of primordial energy etc. 4. We could get the effective result by providing the patient with Jinkansikpung-tang-gami(鎭肝熄風湯加味) in the acute period 5. In Acupuncture treament and other treament, Electro-acupuncture theraphy ana Lodestone theraphy were useo for neurologic stimulation, Body acupuncture and Auricula-acupuncture were used for promoting the circulation of vital energy and blood.

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CFD Study of the Vacuum-Pump Type Subsonic/Sonic Ejector Flows (진공 펌프형 아음속/음속 이젝터 유동에 관한 수치 해석적 연구)

  • 김희동;권오식;최보규
    • Journal of the Korean Society of Propulsion Engineers
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    • v.4 no.4
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    • pp.26-35
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    • 2000
  • This paper depicts the computational results for the axisymmetric subsonic/sonic ejector systems with a second throat. The numerical simulations are based on a fully implicit finite volume scheme of the compressible Reynolds-Averaged Navier-Stokes equations in a domain that extends from the stagnation chamber to the ejector diffuser exit. In order to obtain practical design factors for the subsonic/sonic ejector systems which are applicable to industrial vacuum pumps, the ejector throat area, the mixing section configuration, and the ejector throat length are changed in computations. For the subsonic/sonic ejector systems operating in the range of low operation pressure ratios, the effects of the design factors on the vacuum performance of the secondary chamber are discussed.

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A Correlation between the Pressure Oscillation of Combustion Chamber and Thrust Response in a 70 N-class Hydrazine Thruster (70 N급 하이드라진 추력기의 연소실 압력진동 강도와 추력 응답특성의 상관관계)

  • Jung, Hun;Kim, Jeong Soo
    • Journal of the Korean Society of Propulsion Engineers
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    • v.19 no.3
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    • pp.1-8
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    • 2015
  • A ground hot-firing test(HFT) was accomplished to draw a correlation between the pressure oscillation intensity of combustion chamber and thrust response characteristics in a 70 N-class hydrazine thruster which has been developed recently. Monopropellant grade hydrazine was adopted as a propellant for the HFT, and combustion-chamber characteristic length, propellant injection pressure were applied as test parameters. It was confirmed that the decrease of thrust-chamber diameter and injection pressure augmented the pressure oscillation of stagnation chamber in the test condition specified, and the oscillation hampered the pulse response performance of test models.

Thrust Vectoring Control by Injection of Secondary Jets Inside Supersonic Nozzle (초음속 노즐 내부 이차제트 분출을 통한 추력편향 제어에 관한 연구)

  • Yoon, Sang-Hoon;Kim, Kuk-Jin;Min, Seong-Kyu;Lee, Yeol;Chun, Dong-Yeon
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2008.11a
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    • pp.349-352
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    • 2008
  • Thrust vectoring control by injection of secondary jet inside a convergent-divergent supersonic nozzle was studied by both experimentally and computationally. For various stagnation pressure of the secondary jet injected at a specific location(12 mm-downstream of throat) in the divergent section of nozzle, the characteristics of thrust vectoring were observed. Present numerical results were compared with previous investigators' results and Schlieren flow visualizations for the identical boundary conditions, and it showed a qualitatively good agreement. It was also noticed that the characteristics of thrust vectoring is strongly related to the reflection structure of oblique shock inside nozzle, ie., the pressure ratio of the secondary jet, SPR.

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Study on the Internal Flow of an Electric Oven with Variation of Steam Outlet Position (전기오븐의 스팀 출구위치에 따른 내부유동에 대한 연구)

  • Park, Young Hun;Kim, Yu Jin;Jung, Young Man;Park, Warn-Gyu
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.25 no.8
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    • pp.450-456
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    • 2013
  • The composite electric oven is one of the fixing utensil, various functions are required. Steam generating function, which is one of its functions, and allows various food cooking. The location of the outlet of the steam generator is designed around ease of installation, consideration of internal fluid is not. Distribution of the steam can not be non-uniformly. Accordingly, cooking time becomes longer, the energy consumption increases. As a result of the analysis, it was confirmed stagnation phenomenon of the internal flow through the interpretation of the calculations for the position of the outlet of the steam generator existing. Further, by computing the analysis of various locations of the outlet of the steam generator, we investigated the distribution and characteristics of the internal flow.