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        검색결과 126

        1.
        2023.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        본고는 『헨리 6세』 2부와 3부가 가부장제의 이념을 바탕으로 남녀 간의 뚜렷한 역할 구분에 기초하고 있다고 보고 전통적인 성 역할에 따르지 않는 마가렛과 같은 여성의 양상을 살핀다. 주로 마가렛의 용맹성, 전투력과 성적 매력과 방종이 주변 남성 인물의 가부장적인 가치에 대립되는 모습을 추적한다. 마가렛과 일리노어 등이 권력을 추구하는 과정에서 남성들, 특히 영국 남성을 대표하는 기사도적 영웅들과 대항하는 양상을 보이는데 이 여성 전사들이 대표하는 가치가 어떻게 남성들의 이상적 영웅주의나 부자간의 혈연 중심 관계에 대립하는지도 살핀다. 일부 남성 인물들이 감정에 치중하는 연인의 모습을 보이며 남성간의 유대를 약화시키는 결과에 이르는 아이러니한 상황 또한 살펴본다. 남성들이 이들 여성과 관련하여 남성성을 잃게 되는 과정을 분석함으로써 『헨리 6세』 2부와 3부에 담긴 가부장제의 양상과 여성 전사의 전복적 힘을 충실히 고찰하고자 한다.
        4,600원
        3.
        2023.06 KCI 등재 구독 인증기관 무료, 개인회원 유료
        This review comprehensively summarizes the livestock odor reduction method by dietary manipulation, in-housing management, and manure management. The gut microbial metabolism of animals can be stimulated by low-crude protein feeding and the addition of probiotics, enzymes, plant extracts, and/or organic acids to their feed. These methods can result in reduced odor emissions from manure. For in-housing management, it is important to maintain the proper breeding density in the barn facilities, regularly remove dust and manure, and periodically clean the barn facilities. A barn using litter on the floor can reduce odor at a relatively low cost by adding adsorbents such as zeolite, biochar, etc. Although masking agent spraying can be the simplest and quickest way to control odors, it is not a fundamental odor mitigation strategy. Odor emissions can be reduced by installing covers on manure slurry storage facilities or by acidifying the manure slurry. It is necessary to install a solid-liquid separator in an enclosed facility to minimize odor emissions. Other methods for reducing odor emissions include covering manure composting plants with semi-permeable membranes or using reactor composting technology. In order to minimize odor emissions in the liquid manure composting, sufficient oxygen must be supplied during the fermentation process. Furthermore, the odor reduction effect can be achieved through the liquid manure pit recharge system which supplies matured liquid manure fertilizer to the slurry pit in the pig house.
        5,500원
        4.
        2023.05 구독 인증기관·개인회원 무료
        Plutonium exhibits a variety of oxidation states and has a strong affinity for complexation with organic ligands. Isosaccharinic acid (ISA) is a major degradation product of cellulose materials present in the low to intermediate radioactive wastes. The interaction between trivalent plutonium and ISA can significantly impact the migration and containment of plutonium in the repository environment. In this study, formation of Pu(III) and ISA complexes was investigated at an ionic strength of 1 M of NaClO4 using UV-Vis absorption spectrophotometry. To exclude the effect of the Pu(III) oxidation, absorption spectra were measured within 10 min after adding ISA into Pu(III) solution and processed using HYPSPEC software for deconvolution after baseline correction. Several previous studies showed that the presence of ligands accelerates the oxidation of Pu(III) to Pu(IV). To investigate whether ISA complexation can also accelerate the Pu(III) oxidation, UV-Vis absorption spectra changes over 24 hours were analyzed as a function of the ratio of ISA to plutonium concentration.
        5.
        2023.05 구독 인증기관·개인회원 무료
        Mobility of radionuclides (RNs) in natural water systems can be increased by complex formation with organic materials. In alkaline cement pore-water conditions, cellulose materials in radwastes such as woods and papers are degraded fast to small organic materials. As a major cellulose degradation product, isosaccharinate (ISA) has been paid attention recently due to its effect on facilitating RNs migration. ISA contains a carboxyl and four hydroxyl functional groups, which cooperatively interact to form chelating bonds with positively charged radionuclides. In our previous study, we determined thermodynamic formation constants, reaction enthalpy and entropy of trivalent americium complexes with ISA, Am(ISA)n (3-n)+ (n=1, 2), in weak acidic condition by conducting temperature-dependent UVVis absorption spectroscopy. Based on those thermodynamic constants along with the experimental results from time-resolved laser induced fluorescence spectroscopy and DFT calculations, we suggested two different chelating-modes of ISA on Am(III). It is more relevant to study Am(III)-ISA complexation under alkaline conditions around pH 12.5, which correspond to the pore-water condition of calciumsilicate- hydrate. Under the alkaline conditions, deprotonated hydroxyl groups of ISA can form more strong interactions with Am. Aquatic hydroxide group can also act as a ligand to form ternary Am(III) -ISA-OH complexes. In this study, absorption spectra of Am-ISA systems were monitored with two variations: first, pH variation (5.5–13) in the presence of constant 30 mM ISA, and second, ISA concentration variation (20 μM – 30 mM) at constant pH of 12.5. As increasing the pH at constant 30 mM ISA, absorption spectra of Am(ISA)2 + were red-shifted from 506.3 to 509.5 nm. The samples showed stable absorption spectra over 30 days. On the other hand, samples with lower ISA concentrations below 10 mM at pH 12.5, showed gradual decrease in the absorbance as sample aging time. By examining filtrates after ultrafiltration (1 kDa), we confirmed that aqueous Am(III)-ISA complexes were formed in the presence of 30 mM ISA at pH 12.5, while colloidal particles and precipitations were formed in the conditions of ISA concentrations lower than 10 mM. In this presentation, we will discuss about probable ternary complex forms of Am(III)-ISA-OH, colloidal forms, and solubility of Am(III) as a function of ISA concentration under alkaline conditions. Absorption and luminescence spectroscopic properties of the Am(III)-ISA-OH ternary system will also be presented.
        6.
        2022.12 KCI 등재 SCOPUS 구독 인증기관 무료, 개인회원 유료
        Carbonates are inorganic ligands that are abundant in natural groundwater. They strongly influence radionuclide mobility by forming strong complexes, thereby increasing solubility and reducing soil absorption rates. We characterized the spectroscopic properties of Am(III)-carbonate species using UV-Vis absorption and time-resolved laser-induced fluorescence spectroscopy. The deconvoluted absorption spectra of aqueous Am(CO3)2 − and Am(CO3)3 3− species were identified at redshifted positions with lower molar absorption coefficients compared to the absorption spectrum of aqua Am3+. The luminescence spectrum of Am(CO3)3 3− was red-shifted from 688 nm for Am3+ to 695 nm with enhanced intensity and an extended lifetime. Colloidal Am(III)-carbonate compounds exhibited absorption at approximately 506 nm but had non-luminescent properties. Slow formation of colloidal particles was monitored based on the absorption spectral changes over the sample aging time. The experimental results showed that the solubility of Am(III) in carbonate solutions was higher than the predicted values from the thermodynamic constants in OECD-NEA reviews. These results emphasize the importance of kinetic parameters as well as thermodynamic constants to predict radionuclide migration. The identified spectroscopic properties of Am(III)-carbonate species enable monitoring time-dependent species evolution in addition to determining the thermodynamics of Am(III) in carbonate systems.
        4,800원
        7.
        2022.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Submarining is a phenomenon in that the lap belt goes over the pelvis of the occupant during a frontal crash. It is known to be one of the causes of serious abdominal injuries for the belted occupant. The goal of the current study was to investigate the effect of both the belt geometry and dummy variations on the occurrence of submarining. A series of quasi-static belt-pull tests were performed to evaluate the influence of the parameters on the occurrence of the submarining. The main influencing factor of the submarining was the lap belt angle. The tear or wrinkle of the dummy clothing and torso angle relative to the pelvis also affected the propensity of the submarining. Therefore, these parameters need to be closely monitored to obtain repeatable test results.
        4,000원
        8.
        2022.08 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Under anoxic conditions, this study investigated removal of dissolved As(III) by Si and Al oxides including natural sand, chemically washed sand (silica), alumina, and activated alumina. Despite the similar surface area, natural sand showed greater extents of As(III) sorption than chemically washed sand. This was likely due to the high reactivity of Fe(oxyhydr)oxide impurities on the surface of natural sand. For both sands, As(III) sorption was the greatest at pH 7.1, in agreement with the weakly dissociating tendency of arsenous acid. Also, the least sorption was observed at pH 9.6. At basic pH, elevated silicate, which originated from the dissolution of silica in sands, would compete with As(III) for sorption. Due to the highest surface area, activated alumina was found to quantitatively immobilize the initially added As(III) (6.0×10−7 -2.0×10−5 M). Alumina showed As(III) sorption compared to or greater than chemically washed sand, although the former had less than 6% of the surface of area the latter. The greater reactivity of alumina than chemically washed sand can be explained by using the shared charge of oxygen.
        4,000원
        9.
        2022.05 구독 인증기관·개인회원 무료
        Complexation of actinides and lanthanides with carboxylic organic ligands is known to facilitate migration of radionuclides from deep geological disposal systems of spent nuclear fuel. In order to examine the ligand-dependent structures of trivalent actinides and lanthanides, a series of Eu(III)-aliphatic dicarboxylate compounds, Eu2(oxalate)3(H2O)6, Eu2(malonate)3(H2O)6, and Eu2(succinate)3(H2O)2, were synthesized and characterized by using X-ray crystallography and time-resolved laser fluorescence spectroscopy. Powder X-ray diffraction results captured the transition of the coordination modes of aliphatic dicarboxylate ligands from side-on to end-on binding as the carbon chain length increases. This transition is illustrated in malonate bindings involving a combination of side-on and end-on modes. Strongly enhanced luminescence of these solid compounds, especially on the hypersensitive peak, indicates a low site symmetry of these solid compounds. Luminescence lifetimes of the compounds were measured to be increased, which is ascribed to the displacement of water molecules in the innersphere of Eu center upon bindings of the organic ligands. The numbers of remaining bound water molecules estimated from the increased luminescence lifetimes were in good agreement with crystal structures. The excitation-emission matrix spectra of these crystalline polymers suggest that oxalate ligands promote the sensitized luminescence of Eu(III), especially in the UV region. In the case of malonate and succinate ligands, charge transfer occurs in the opposite direction from Eu(III) to the ligands under UV excitation, resulting in weaker luminescence.
        10.
        2021.09 KCI 등재 SCOPUS 구독 인증기관 무료, 개인회원 유료
        Legacy waste from the decommissioned A-1 nuclear power plant in the Slovak Republic is scheduled for immobilisation within a tailored alkali borosilicate glass formulation, as part of ongoing site cleanup. The aqueous durability and characterisation of a simulant glass wasteform for Chrompik III legacy waste, was investigated, including dissolution experiments up to 112 days (90°C, ASTM Type 1 water). The wasteform was an amorphous, light green glassy product, with no observed phase separation or crystalline inclusions. Aqueous leach testing revealed a suitably durable product over the timescale investigated, comparing positively to other simulant nuclear waste glasses and vitreous products tested under similar conditions. Iron and titanium rich precipitates were observed to form at the surface of monolithic samples during leaching, with the formation of an alkali deficient alteration layer behind these at later ages. Overall this glass appears to perform well, and in line with expectations for this chemistry, although longer-term testing would be required to predict overall durability. This work will contribute to developing confidence in the disposability of vitrified Chrompik legacy wastes.
        4,600원
        12.
        2020.08 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Natural gas is the most realistic fuel among eco-friendly fuels. Natural gas production is limited, and in Korea, it is supplied and utilized in the form of liquefied natural gas (LNG). In the case of LNG, the vaporization point is 163 degrees below zero, so ordinary metal cannot be used due to its brittleness. The International Maritime Organization (IMO) defines metals that can be used in the IGC Code, and is used for storage containers, transportation containers, etc. based on the metals. Welding is essential in the manufacture of large structures such as LNG storage tanks. In this study, weldability studies related to cryogenic materials were conducted. In Part I of this study, high-manganese steel and part II were studied for two types of stainless steel (STS304L, STS316L), and in Part III, aluminum (AL5083). During laser welding, the shape of the Bead on Plate (BOP) was analyzed, and a total of nine cases were analyzed using laser power and welding speed as variables. It was confirmed that the penetration and the width of the welding width were linearly proportional to the amount of heat input. Based on this study, it is possible to conduct a follow-up study to find the optimal welding conditions for butt welding and fillet welding.
        4,000원
        13.
        2019.10 KCI 등재 SCOPUS 구독 인증기관 무료, 개인회원 유료
        In this study, we investigate the effect of Al/N source ratios and growth rates on the growth and structural properties of AlN films on c-plane sapphires by plasma-assisted molecular beam epitaxy. Both growth rates and Al/N ratios affect crystal qualities of AlN films. The full width at half maximum (FWHM) values of (1015) X-ray rocking curves (XRCs) change from 0.22 to 0.31° with changing of the Al/N ratios, but the curves of (0002) XRCs change from 0.04 to 0.45° with changing of the Al/N ratios. This means that structural deformation due to dislocations is slightly affected by the Al/N ratio in the (1015) XRCs but affected strongly for the (0002) XRCs. From the viewpoint of growth rate, the AlN films with high growth rate (HGR) show better crystal quality than the low growth rate (LGR) films overall, as shown by the FWHM values of the (0002) and (1015) XRCs. Based on cross-sectional transmission electron microscope observation, the HGR sample with an Al/N ratio of 3.1 shows more edge dislocations than there are screw and mixed dislocations in the LGR sample with Al/N ratio of 3.5.
        4,000원
        14.
        2019.06 KCI 등재 SCOPUS 구독 인증기관 무료, 개인회원 유료
        Using ALMA observations of the 13CN and DCN lines in the massive star-forming region G33.92+0.11A, we investigate the CN/HCN abundance ratio, which serves as a tracer of photodissociation chemistry, over the whole observed region. Even considering the uncertainties in calculating the abundance ratio, we fi nd high ratios (》1) in large parts of the source, especially in the outer regions of star-forming clumps A1, A2, and A5. Regions with high CN/HCN ratios coincide with the in infows of accreted gas suggested by Liu et al. (2015). We conclude that we found strong evidence for interaction between the dense gas clumps and the accreted ambient gas which may have sequentially triggered the star formation in these clumps.
        4,000원
        16.
        2018.09 KCI 등재 구독 인증기관 무료, 개인회원 유료
        본 논문은 존 던이 『드러나는 일들에 대한 묵상』 III에서 인간의 나약성, 죄, 그리고 한계성의 인식에서 비롯된 내적 분란을 어떻게 형상화하고 있는가를 보여주는데 있다. 또한 이러한 내적 혼돈과 불편함을 전지전능하신 신의 목적과 현시에 대한 명상을 통해 어떻게 저항하고 극복해 가는가를 분석한다. 존 던의 이 작품 여러 곳에서는 영적 불안정성, 인간 삶의 유한함, 인간사의 여러 한계에 대한 생각으로 인하여 비롯된 영적 불안함을 성스러운 신에 대한 통찰을 통해 대면하고 극복해 나가는 영적 순례를 보여주고 있다. 이 작품의 세 부분을 통하여 던은 구원에 대한 신성한 묵상을 통하여 내적으로 자기 파멸적인 고뇌를 해결하고자 노력하고 있음을 보여준다.
        5,700원
        17.
        2018.03 KCI 등재 구독 인증기관 무료, 개인회원 유료
        본 논문의 목적은 바이런이 쓴 『차일드 헤럴드의 순례』 III-IV 칸토에 주인공인 헤럴드가 인간의 명예, 권력, 유한성, 그리고 삶의 생명력과 관련하여 상실, 고통 그리고 영적인 깨달음에 대해 어떻게 인식하고 있는가를 다루는데 있다. 바이런이 살던 당대와 현대 비평가들은 이 부분에 대해 간략하게 언급해 오고 있으며, 특히 이를 바이런적 인물들의 특성으로 치부하는 경향이 있다. 즉, 바이런 시인 자신의 음울하고 고독한 면모의 일부가 드러난 것으로 폄훼하여 작품 자체의 역동성을 간과하고 있다. 이에 본 논문은 헤럴드가 칸토 네 개를 통해 어떻게 내면 및 외부세계와의 다양한 관계 속에서 상실, 고난, 영적 각성을 밀도 있게 드러내는 가에 초점을 두고 있다. 이를 바이런이 쓴 다른 작품들과의 상호연관성 속에서 심도 있게 다룸과 아울러 헤럴드가 사랑, 삶의 활력과 불멸의 세계를 상실과 고난에 대한 인식과 더불어 어떻게 받아들이고 있는가도 다루어 본다.
        5,800원
        18.
        2018.02 KCI 등재 SCOPUS 구독 인증기관 무료, 개인회원 유료
        Detecting exoplanets around giant stars sheds light on the later-stage evolution of planetary systems. We observed the M giant HD 18438 and the K giant HD 158996 as part of a Search for Exoplanets around Northern circumpolar Stars (SENS) and obtained 38 and 24 spectra from 2010 to 2017 using the high-resolution Bohyunsan Observatory Echelle Spectrograph (BOES) at the 1.8m telescope of Bohyunsan Optical Astronomy Observatory in Korea. We obtained precise RV measurements from the spectra and found long-period radial velocity (RV) variations with period 719.0 days for HD 18438 and 820.2 days for HD 158996. We checked the chromospheric activities using Ca ii H and H lines, HIPPARCOS photometry and line bisectors to identify the origin of the observed RV variations. In the case of HD 18438, we conclude that the observed RV variations with period 719.0 days are likely to be caused by the pulsations because the periods of HIPPARCOS photometric and H EW variations for HD 18438 are similar to that of RV variations in Lomb-Scargle periodogram, and there are no correlations between bisectors and RV measurements. In the case of HD 158996, on the other hand, we did not find any similarity in the respective periodograms nor any correlation between RV variations and line bisector variations. In addition, the probability that the real rotational period can be as longer than the RV period for HD 158996 is only about 4.3%. Thus we conclude that observed RV variations with a period of 820.2 days of HD 158996 are caused by a planetary companion, which has the minimum mass of 14.0 MJup, the semi-major axis of 2.1 AU, and eccentricity of 0.13 assuming the stellar mass of 1.8 M⊙. HD 158996 is so far one of the brightest and largest stars to harbor an exoplanet candidate.
        4,000원
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