• 천문학회보
• /
• 제43권1호
• /
• pp.34.2-35
• /
• 2018

Galaxy transition from star-forming to quiescent, accompanied with morphology transformation, is one of the key unresolved issues in extragalactic astronomy. Although several environmental mechanisms have been proposed, a deeper understanding of the impact of environment on galaxy transition still requires much exploration. My Ph.D. thesis focuses on which environmental mechanisms are primarily responsible for galaxy transition in different environments and looks at what happens during the transition phase using multi-wavelength photometric/spectroscopic data, from UV to mid-infrared (MIR), derived from several large surveys (GALEX, SDSS, and WISE) and our GMOS-North IFU observations. Our multi-wavelength approach provides new insights into the *late* stages of galaxy transition with a definition of the MIR green valley different from the optical green valley. I will present highlights from three areas in my thesis. First, through an in-depth study of environmental dependence of various properties of galaxies in a nearby supercluster A2199 (Lee et al. 2015), we found that the star formation of galaxies is quenched before the galaxies enter the MIR green valley, which is driven mainly by strangulation. Then, the morphological transformation from late- to early-type galaxies occurs in the MIR green valley. The main environmental mechanisms for the morphological transformation are galaxy-galaxy mergers and interactions that are likely to happen in high-density regions such as galaxy groups/clusters. After the transformation, early-type MIR green valley galaxies keep the memory of their last star formation for several Gyr until they move on to the next stage for completely quiescent galaxies. Second, compact groups (CGs) of galaxies are the most favorable environments for galaxy interactions. We studied MIR properties of galaxies in CGs and their environmental dependence (Lee et al. 2017), using a sample of 670 CGs identified using a friends-of-friends algorithms. We found that MIR [3.4]-[12] colors of CG galaxies are, on average, bluer than those of cluster galaxies. As CGs are located in denser regions, they tend to have larger early-type galaxy fractions and bluer MIR color galaxies. These trends can also be seen for neighboring galaxies around CGs. However, CG members always have larger early-type fractions and bluer MIR colors than their neighboring galaxies. These results suggest that galaxy evolution is faster in CGs than in other environments and that CGs are likely to be the best place for pre-processing. Third, post-starburst galaxies (PSBs) are an ideal laboratory to investigate the details of the transition phase. Their spectra reveal a phase of vigorous star formation activity, which is abruptly ended within the last 1 Gyr. Numerical simulations predict that the starburst, and thus the current A-type stellar population, should be localized within the galaxy's center (< kpc). Yet our GMOS IFU observations show otherwise; all five PSBs in our sample have Hdelta absorption line profiles that extend well beyond the central kpc. Most interestingly, we found a negative correlation between the Hdelta gradient slopes and the fractions of the stellar mass produced during the starburst, suggesting that stronger starbursts are more centrally-concentrated. I will discuss the results in relation with the origin of PSBs.

• 한국작물학회지
• /
• 제58권1호
• /
• pp.71-77
• /
• 2013

본 연구는 바이오에탄올 생산용 작물 선발을 위해 국내재배 가능한 일년생 작물중에서 바이오매스 생산량이 우수한 수수-수단그래스 교잡종에 대한 바이오에탄올 생산성을 조사하였으며 그 결과는 다음과 같다. 1. 총 11 품종의 수수-수단그래스 교잡종 대한 화학적 특성 검증 결과 셀룰로오스 함량은 Green Star 품종이 가장 높았으며 발효율 검정을 위해 Green Star, Revolution, KF429 그리고 SS504 4품종을 선발하였다. 2. 선발된 4품종으로부터 발효 당을 추출하기 위해 시료와 1 M NaOH 용매를 1:14의 비율로 혼합하고 $150^{\circ}C$에서 30분간 전처리하였을 때 시료내 셀룰로오스 함량은 55%이상 이였으며, 발효 저해 작용을 하는 리그닌 및 회분 함량은 65%이상 제거 되었다. 3. 전처리물의 당화율 검정을 위해 celli CTEC II 효소 30 FPU/g-cellulose를 사용하였으며 4품종의 당화율은 평균 86%이었다. 4. 수수-수단그래스 교잡종의 발효율 검정은 동시당화발효(SSF)방법으로 수행하였으며 발효균주로는 Saccharomysis cerevisiae CHY1011를 사용하였고, 결과적으로 Green Star의 발효율이 92.4%로 가장 높았으며 에탄올 생산량은 6,206 L/ha임을 확인하였다.

• 한국실내디자인학회논문집
• /
• 제18권1호
• /
• pp.99-107
• /
• 2009

In order to prepare future green hospital architecture authentication system, this study is a comparative year report to Korean, the United States, Japanese, British, Canadian and Australian green building authentication systems. Also, the United States and Australian Green hospital authentication systems were examined, and the authentication items of hospitals were compared with those of civil architecture. Though the examination and analysis, the portion of indoor environmental quality section commonly shows the average of 20.7 percent in all 6 countries. Especially, IAQ(Indoor Air Quality) among inside IEQ(Indoor Environment Quality) is overwhelmingly much treated in Korea, the U.S.A, Canada and Australia. In Japan, heat, light and sound are the important factors for authentication evaluation, while in the U.K light are more emphasized for the authentication. 'LEED for Healthcare' as a hospital evaluation authentication system subdivided currently most. The system includes the detailed and extensive evaluation items ranging from hospital management, traffic, emission, water resources utilization to integrated design and furnishing. These overseas systems should be carefully investigated, researched and analyzed for an appropriate improvement of domestic green hospital authentication system. Also the current evaluation method of IEQ section of Korean GBCC needs to be modified. That's why the method puts too much importance on IAQ in IEQ section.

• 원예과학기술지
• /
• 제35권4호
• /
• pp.418-430
• /
• 2017

The objective of this study was to understand the combined effect of shading treatment and harvest time on pungency, ascorbic acid content, market-quality pepper yield, and photosynthetic activity in a yellow 'Star Flame' and 'Fire Flame' F1 hybrid pepper cultivar (Capsicum annuum). Plants were cultivated in a greenhouse under white, red, and green shading nets and compared to those grown under unshaded control conditions. The ascorbic acid and pungency parameters were analyzed by high-performance liquid chromatographic methods. Ascorbic acid, a compound of high nutritive value in pepper, was highest in fruits gathered during the first summer harvest in both hybrids. The ascorbic acid content was found to be further increased in fruits from plants grown under white net shading in both 'Star Flame' and 'Fire Flame'. Total capsaicinoid contents in 'Star Flame' were influenced by the interaction of shading treatment and harvest time (p = 0.004), with the lowest amounts ($241.2-251.5mg{\cdot}kg^{-1}$ fresh weight) resulting from white and red shading treatments at the early autumn harvest. In 'Fire Flame', both shading treatment (p = 0.009) and harvest time (p < 0.001) affected total capsaicinoid contents. We observed significantly higher total capsaicinoid contents in control fruits compared to that resulting from red and green shading treatments at the second harvest, and that resulting from red shading treatment at the third harvest. Analysis of photosynthetic activity revealed a significant and negative correlation between Fv/Fm values and total capsaicinoid contents in both hybrids (p < 0.001). Based on the obtained results, the harvest of peppers during summer should be promoted to produce fruits with high pungency.

• 대한조선학회논문집
• /
• 제52권3호
• /
• pp.198-205
• /
• 2015

In this study, numerical studies using a Computational Fluid Dynamics(CFD) method were carried out to estimate the green water load acting on the breakwater plate of bow deck of container carrier, KCS. For the green load water load analysis, a full load condition was considered. The relative motions at bow deck were calculated from the seakeepig analysis. Statistical analysis were carried out to estimate the long term response of the relative motions with the North Atlantic wave scatter diagram. The equivalent design wave was determined from the RAO of the relative motions at bow and the long term responses. CFD geometry modeling with three different locations and simulations for the green water loads were carried out in the equivalent design waves. A commercial CFD program, STAR-CCM+ Ver. 8.04, was used and the green water pressures on the breakwater plate were calculated successfully. The CFD analysis for green water loads can be used as a useful design tool for the evaluation of the breakwater plate of the container vessel.

• 보건의료산업학회지
• /
• 제5권2호
• /
• pp.199-208
• /
• 2011

The purpose of this study is to investigate the strategies and the experiences of 3 university hospitals relevant to environmentally-friendly strategy in their hospitals and to find out the implication for spreading the environmentally-friendly hospital management to other Korean hospitals. The study was progressed from October to November 2010 through the in depth interview with middle manager of the hospitals. Interview items about environmentally-friendly hospital management were selected from ISO 14001, Korean Green Management Certification Scheme, Green Guide Operation Version 2.2 of GGHC, Eco-ChecklistTM, Self-Assessment Tool of "Practice Greenhealth" and some accreditation credits of LEED, BREEAM, GreenStar. The case study result implies that the following strategies are so critical to settle environmentally-friendly hospitals in Korea: 1)understanding about fundamental concept of environmentally-friendly hospital, 2)organizing green teams, 3)purchasing environmentally-friendly goods, 4)benchmarking other successful hospitals, 5)adopting easy & reasonable policy first, 6)managing accumulated data & performance about energy efficiency, and 7)educating the employee about environmentally-friendly hospitals strategies. Hospitals have to keep in pace with the change in government policy and scheme like as GHG & Energy Target Management System, Korean Green Management Certification Scheme, ESCO, and so on for achieving the successful environmentally-friendly hospitals.

• 생물환경조절학회지
• /
• 제22권3호
• /
• pp.209-213
• /
• 2013

아티초크는 가을에 정식하여 겨울철 월동 중에 화아분화가 이듬해 5월경에 수확이 가능하다. 본 시험은 아티초크 육묘 중 저온처리를 하여 생산시기를 7월로 늦추고자 수행하였다. 시험품종은 '그린글로브' 및 '임페리얼스타'를 이용하였다. 파종은 72공 플러그 트레이를 이용하여 2월 10일에 파종하였고 4주간 $17^{\circ}C$에서 육묘한 후 3, 6, 9, $12^{\circ}C$에서 4주간 육묘하였으며 4월 8일에 노지 포장에 정식하였다. 재식거리는 이랑폭 150cm에 주간거리 50cm(1,523주/10a), 1조식으로 하였다. 온도 처리별로는 $6^{\circ}C$ 처리에서 화뢰 발생이 63%로 가장 많았고 $12^{\circ}C$에서는 33%로 가장 낮았으며 무처리의 경우는 5%의 화뢰가 형성되어 저온에 민감한 품종임을 알 수 있었다. '그린글로브' 품종의 경우 $9^{\circ}C$에서 화뢰 형성율이 가장 높아 28%였고 $12^{\circ}C$에서는 10%로 가장 낮았으며 무처리의 경우는 화뢰가 전혀 형성되지 않았다. 화뢰중은 '임페리얼스타' 품종이 97g 내외였고 '그린글로브' 86g 내외로 자랐다. 수량은 '임페리얼스타'에서 215kg, '그린글로브'에서는 108kg을 보였다.

• 한국전산유체공학회지
• /
• 제20권2호
• /
• pp.96-102
• /
• 2015

In this study, the green water phenomena on rectangular shaped structure is numerically simulated by STAR-CCM+ to investigate the flow pattern including the velocity profiles in bubbly water flow. 5 phases of the formation of green water in front of and over the rectangular shaped structure is simulated at the design condition which is scaled down by 1:125 from FPSO operating in GOM. All numerical results are compared with the experimental results performed in a two dimensional wave flume. The water deformation due to the green water are obtained by the high speed CCD camera with employing the shadow graphy technique, which is allowed to take the bubbly water flow into images. A series of image taken by shadow graphy technique is analyzed with MQD method to calculate the velocity in bubbly water flow.

• 천문학회보
• /
• 제35권2호
• /
• pp.28.1-28.1
• /
• 2010

Recent surveys have shown that many early-type galaxies have signatures of ongoing or recent star formation (RSF). These RSF galaxies show blue integrated UV-optical colours that set them aside in the NUV integrated colour-magnitude relation. Among them, NGC 4150 has been observed using the Wide Field Camera 3 (WFC3) on board the Hubble Space Telescope to inspect the galaxy with higher spatial resolution. In the WFC3 data, the galaxy reveals ubiquitous near-UV emission and remarkable dusty substructure. Our analysis shows this galaxy to lie in the near-UV green valley, and its pixel-by-pixel photometry exhibits a narrow range of UV-optical colours that are similar to those of nearby E+A (post-starburst) galaxies, and lie between those of M83 (an actively star-forming spiral) and the local quiescent early-type galaxy population. This work reaffirms our hypothesis that minor mergers play a significant role in the evolution of early-type galaxies at late epochs.

• 한국초지조사료학회지
• /
• 제41권2호
• /
• pp.110-118
• /
• 2021

본 연구는 시화간척지에서 하계 사료작물의 초종 및 품종이 생육특성 및 생산성에 미치는 영향을 구명하기 위하여 수행하였다. 시험에 공시된 하계사료작물은 옥수수, 수수×수단그라스 교잡종 및 기장이었다. 시험에 공시된 각각의 품종은 옥수수는 광평옥, P15453, P1952 및 P2088을 이용하였고, 수수×수단그라스 교잡종은 877F, Green star, Honey chew 및 Turbo gold 품종을 이용하였다. 기장은 국립식량과학원에서 육성한 이백찰, 금실찰 및 만홍찰 품종을 이용하였다. 사료작물의 파종은 옥수수와 수수×수단그라스 교잡종은 2019년 5월 21일 그리고 기장은 6월 4일에 하였으며 수확은 9월 2일에 하였다. 옥수수의 초장 및 착수고는 품종간에 유의성이 없었으며 수량은 P1543 품종이 가장 많았고 P2088 품종이 가장 적었으나 처리간 유의성은 나타나지 않았다. 수수×수단그라스 교잡종은 877F의 초장이 가장 컸으며 Turbo gold 품종이 가장 작았다(p<0.05). 건물수량은 877F가 3,862 kg/ha로 가장 많았고 Green star가 2,669 kg/ha로 가장 낮았다(p<0.05). 기장의 초장은 이백찰이 138cm로 가장 컸으며 나머지 품종은 유의적인 차이가 없었다. 기장의 생초수량은 평균 15,778 kg/ha로 옥수수나 수수×수단그라스 교잡종보다 많았으며, 건물수량은 평균 4,780 kg/ha이었으며 이백찰 품종이 다른 품종들에 비해 가장 많았다(p<0.05). 옥수수의 사료가치에서 TDN 함량은 P2088품종이 가장 높았고 광평옥이 가장 낮았다(p<0.05). 수수×수단그라스 교잡종은 Green star 및 Honey chew 품종이 유의적으로 높았으며 RFV 값은 Turbo gold가 가장 낮았다. 기장은 평균 조단백질 함량은 7.03%이었고 TDN 및 RFV 값은 금실찰이 64.36% 및 106으로 가장 높았다. 염농도에 따른 하계 사료작물의 발아율 조사에서 옥수수는 0.4%까지는 83.1%의 발아율을 나타내었다. 특히 P2088 및 P1921 품종은 0.6% 농도에서도 발아율이 80% 이상이었다. 수수×수단그라스 교잡종은 877F 품종의 발아율이 0.8% 농도에서도 93.3% 이었으며 Honey chew는 88.3%로 나타나 다른 품종에 비해 염 농도에 대한 저항성이 높은 것으로 나타났다. 기장은 0.6%의 염 농도에서도 84.0-88.7%의 높은 발아율을 나타내었다. 이상의 결과를 종합하여 볼 때 염농도가 높은 시화 간척지에서 가장 적합한 초종은 기장이 추천되었으며, 이백찰은 수량이 높아 적합한 품종으로 권장되었다.