• 원예과학기술지
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• 제16권3호
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• pp.358-360
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• 1998

본 실험은 자생나리인 땅나리의 기내 대량생산 체계를 확립하기 위한 기초 연구로서 배양환경중 광환경 및 배양 절편체의 분화 능력 조건을 유도하여 자구의 생장을 촉진시킬 수 있는 방법을 모색하기 위하여 실시하였다. 광조건은 24시간 지속적인 일장처리와 2,500~5,000 Lux 정도의 광도가 자구의 발달에 효과적이었다. 계대배양시 번무한 지상부를 자구의 연접부위까지 완전히 절단해 줌으로써 전반적인 식물체 생육을 촉진시킬 수 있었고, 절편체의 크기가 클수록 자구수가 많았으나, 자구의 비대는 모인편의 크기가 작은 처리구에서 약간 우수하였다. 광을 많이 필요로 하는 땅나리는 기내 인편 배양시 치상방법을 배지면 위에 노출시켜 치상하는 것이 자구생산면에 있어서 효율적이었다.

• 대한환경공학회지
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• 제35권9호
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• pp.660-665
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• 2013

소화설비내 스케일 형성의 주요 원인을 파악하기 위하여 스케일 성분분석 및 음식물류 폐수에 대한 혐기소화 실험을 하였다. 성분분석결과, 음식물류 폐수 중 유분이 스케일의 유기성분과 밀접한 연관이 있었다. 또한, 소화실험시 소화조내 결정체의 발생량은 음식물류 폐수중 유분을 사전에 제거한 경우가 제거하지 않은 원수를 소화한 경우의 58.9% 수준으로 나타나 유분이 스케일 형성의 중요한 요인임을 알 수 있었다. 아울러, 유분을 제거한 음식물류 폐수는 68.7 L-gas/kg-COD 그리고 음식물류 폐수 원수는 67.7 L-gas/kg-COD로서 유분의 사전제거가 소화가스 생산에 부정적 영향을 주지 않았다.

• 천문학회지
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• 제29권spc1호
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• pp.71-72
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• 1996

We show that the star formation activity of spiral galaxies has a great variety. The star formation variation in a time scale of $10^8$ yr and the mechanism responsible for the variation are discussed.

• 한국지구과학회지
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• 제30권5호
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• pp.605-610
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• 2009

Cupressinocladus sp. found from the upper part of the Jinju Formation of the Shindong Group, Korea is described here based on the newly found leafy shoots. This species is characterized by the branched leafy shoot with decussate scale leaves. The presence of Cupressinocladus in the Jinju Formation indicates that the Early Cretaceous flora-sites in Eastern Eurasia are in a close association with territories of the mixed-type floras. The finding of this species records the first report for the Nakdong flora.

• 천문학회보
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• 제44권2호
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• pp.68.3-68.3
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• 2019

We present the preliminary results on the formation of star clusters by cloud-cloud collision. For this purpose, we perform sub-parsec scale, radiation-hydrodynamic simulations of giant molecular clouds using a sink particle algorithm. The simulations include photo-ionization, direct radiation pressure, and non-thermal radiation pressure from infrared and Lyman alpha photons. We confirm that radiation feedback from massive stars suppresses accretion onto sink particles. We examine the collision-induced star formation and discuss the possibility on the formation of a globular cluster.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2005년도 추계종합학술대회
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• pp.611-614
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• 2005

In this paper, investigated is the relationship between the formation temperature and the thermal stability of Ni silicide formed with Ni-V (Nickel Vanadium) alloy target. The sheet resistance after the formation of Ni silicide with the Ni-V showed stable characteristic up to RTP temperature of $700\;^{\circ}C$ while degradation of sheet resistance started at that temperature in case of pure-Ni. Moreover, the Ni silicide with Ni-V indicated more thermally stable characteristic after the post-silicidation annealing. It is further found that the thermal robustness of Ni silicide with Ni-V was highly dependent on the formation temperature. With the increased silicidation temperature (around $700\;^{\circ}C$), the more thermally stable Ni silicide was formed than that of low temperature case using the Ni-V.

• 패션비즈니스
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• 제5권3호
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• pp.73-84
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• 2001

The purpose of this study is to apply fundamental data of impression formation research by analysing and observing the various facial image that can be effected from hair style as well as be helpful for choosing suitable hair style for T.P.O in modern society. This study targeted 305 college women in Daegu and Gyung-book area. Hair Style Image Scale(HSIS)was used the scale of seven point modified the S-D(Semantic Differential) method. The analysis of impression formation effect of hair style using SPSS WIN package have completed from the principal component analysis by Varimax perpendicular rotation method and ANOVA was used to recognize the difference in impression formation according to hair style change. In the case of statistical difference was appeared, LSD post-verification was applied for that. The conclusions of this study is as followed ; 1. The factors of impression formation effected by hair style were classified as goodwill factor, refinement factor, elegance factor and individuality factor. 2. In terms of goodwill factor, long hair style showed highest level and short cut hair, bobbed hair in an order. In refinement factor, there was no difference between short cut hair and bobbed hair and both of them was higher than long hair. In elegance factor, long hair was highest and bobbed hair was lowest. In individuality factor, short cut hair and bobbed hair higher than long hair and no difference between short cut hair and bobbed hair.

• 펄프종이기술
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• 제38권4호
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• pp.24-30
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• 2006

Formation which is an indicator of nonuniformity in fiber distribution is concerned with small scale variation in roughness, optical properties, print density, and so on. This study evaluated the formation of sheets which were made usning handsheet former and paper-machine with hydraulic headbox. Optical method and ${\beta}-ray$ method were used for formation test. The fiber type, freeness and basis weight of sheet were considered as variables. The formation of handsheet was affected by fiber type and freeness, and floe size distribution was influenced by basis weight. For machine made sheet, its formation seemed to be dependent on the hydraulic forces in headbox and former. When two formation test methods were compared, there was the highest relationship between optical formation index and normalized standard deviation from ${\beta}-ray$ method.

• 대한환경공학회지
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• 제33권4호
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• pp.258-266
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• 2011

수중 경도물질에 의해 유발된 스케일은 수질 저해는 물론 배관의 기능에 막대한 손실을 초래할 수 있어 관리가 필요하다. 특히 온수시스템의 경우, 온도에 의해 스케일화작용이 가속화되므로 관리가 필요한 시설 중 하나이다. 현재까지는 화학약품이나 에너지가 소모되는 화학적, 물리적, 전자기적 방법과는 다른 무전원방식의 Frequency Driver (FD)를 이용하여 스케일 생성 방지 효과를 확인하고자 하였다. 500 mg/L의 경수에 33일간 3종류의 관 시편을 침지시켜 관 재질별 스케일 형성도를 비교하기 위해 XRD와 SEM을 이용하여 표면을 분석하였다. 주철관에서는 경도에서 유발된 스케일인 calcite ($CaCO_3$)가 형성되었고, 구리나 스테인리스관에 비해 부식율이 높았다. 온수순환장치를 제작하여 경도 300 mg/L로 $50^{\circ}C$의 조건에서 FD 설치 유무에 따른 주철관의 스케일 형성도와 수질 변화를 비교하였다. XRD 결과에서 FD를 설치하였을 경우 calcite의 생성은 비교적 적은 반면, 좋은 부식생성물인 magnetite ($Fe_3O_4$)의 생성을 확인할 수 있었으며, SEM 사진에서도 FD의 스케일 저감 효과를 확인할 수 있었다. 관 내부의 스케일 양의 경우, FD를 설치하지 않은 경우에 비해 FD를 설치하였을 경우 관 연결부분에서는 16%, 관 전체길이에서는 14%, 열교환기에서는 42%의 적은 스케일이 형성되어 FD의 스케일 저감효과를 확인할 수 있었다. 또한 FD 설치 유무에 따른 수질분석 결과를 토대로 FD가 수질의 화학적 변화 없이 경도물질의 결정화를 방지하는 것으로 나타나 환경적으로도 안전함을 확인하였다.

• 천문학회보
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• 제45권1호
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• pp.38.2-38.2
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• 2020

Horizon Run 5 (HR5) is a cosmological hydrodynamical simulation which captures the properties of the Universe on a Gpc scale while achieving a resolution of 1 kpc. This enormous dynamic range allows us to simultaneously capture the physics of the cosmic web on very large scales and account for the formation and evolution of dwarf galaxies on much smaller scales. Inside the simulation box. we zoom-in on a high-resolution cuboid region with a volume of 1049 × 114 × 114 Mpc3. The subgrid physics chosen to model galaxy formation includes radiative heating/cooling, reionization, star formation, supernova feedback, chemical evolution tracking the enrichment of oxygen and iron, the growth of supermassive black holes and feedback from active galactic nuclei (AGN) in the form of a dual jet-heating mode. For this simulation we implemented a hybrid MPI-OpenMP version of the RAMSES code, specifically targeted for modern many-core many thread parallel architectures. For the post-processing, we extended the Friends-of-Friend (FoF) algorithm and developed a new galaxy finder to analyse the large outputs of HR5. The simulation successfully reproduces many observations, such as the cosmic star formation history, connectivity of galaxy distribution and stellar mass functions. The simulation also indicates that hydrodynamical effects on small scales impact galaxy clustering up to very large scales near and beyond the baryonic acoustic oscillation (BAO) scale. Hence, caution should be taken when using that scale as a cosmic standard ruler: one needs to carefully understand the corresponding biases. The simulation is expected to be an invaluable asset for the interpretation of upcoming deep surveys of the Universe.