• Proceedings of the Korean Institute of Industrial Safety Conference
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• 2000.06a
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• pp.120-123
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• 2000

최근 첨단 과학기술의 급속한 발전에 따라 각종 화학물질이 여러분야에서 제조되고 또한 취급되고 있다. 이들 화학물질은 그 합성, 정제 및 사용법 등에 대해서는 각종 문헌에 잘 기재되어 있으나 그 위험성에 대해서는 충분히 파악되어 있지 않았거나 발표되어 있지 않은 것이 많아 대상이 되는 반응조건 이나 제조조건을 변경해야하는 경우 제조자 스스로 결정해야 하는 경우가 많아 뜻하지 않은 재해가 발생하는 예가 증가하고 있다. 따라서 본 연구에서는 의약품 및 농약 등 합성시 중간체로서 널리 사용되고 있으나 구조적인 특성상 열에 매우 불안정하여 산안법상 위험물중 폭발성물질로 분류되어 있는 니트로페닐하이드라진에 대한 열분해 특성을 시차주사열량계(DSC) 및 가속 속도열량계(ARC) 이용하여 그 위험성을 평가하였다. (중략)

• Economic and Environmental Geology
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• v.43 no.5
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• pp.477-490
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• 2010

The Gagok stratabound skarn deposit is the result of the intrusion of the Cretaceous granitic pluton into the Paleozoic calcareous rocks. The subvolcanic intrusion ranges in composition from quartz monzonite to granite porphyry with I-type, calc-alkaline and weakly peraluminous characteristics. Both endoskarn and exoskarn are developed at the Gagok Zn-(Pb) deposit, with more exoskarn than endoskarn. Geochemical and mineralogical characteristics in the Seongok and Wolgok orebodies can be treated in terms of self-organization. Sphalerites in the Gagok ore can also incorporate minor amounts of Mn, Cd, Cu and In. Trace element concentrations in different orebodies vary because fractionation of a given element into sphalerite is influenced by formation temperature and the amount of sphalerite in the ore. A group of high In/Zn and Cd/Zn ratios in ores, and low Mn/Fe ratios in sphalerites are correlated with proximal processes of a magmatic source. The pattern of minor/trace element variations in ores and sphalcrites can be used for petrogenetic interprctation, e.g., orebody zonation related to crystallization temperature and fluid d sources.

• Journal of the Mineralogical Society of Korea
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• v.18 no.3 s.45
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• pp.165-181
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• 2005

The granitic rocks distributed in the southern part of the Yangsan Fault are classified into five distinct rock facies based on the field relation, petrography and geochemical characteristics. These five different rock facies can be grouped into two considering their origins. Group I, which reveals various evidences of magma mixing, includes three rock facies of granodiorite, enclave-rich porphyritic granite, and enclave-poor porphyritic granite. Group H intruding Croup I includes equigranular granite and micrographic granite with no evidence of magma mixing. It is suggested that the distinctively different trace element and isotopic chemistries between group I and II, support evolution from the different parental magma. It is suggested that the three rock facies in group I were generated by different degrees of magma mixing in addition to fractionation of plagioclase. MMEs experienced fractionation of biotite. The two facies in group H seem to have been generated from different parent magma from group I and evolved by fractionation of K-feldspar. The Rb-Sr whole-rock ages of the group I rocks yield $59.2\~58.9Ma$, and those of the group II rocks give 53. $3\~51.7Ma$, regardless of their distribution whether they occur in the eastern or western parts of the Yangsan Fault. Based on Sm-Nd isotope compositions, depleted mantle model ages $(T_2DM)$ of the group I range $0.8\~0.9Ga$, while those of the group II$0.6\~0.7Ga$.

• The Journal of the Petrological Society of Korea
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• v.28 no.2
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• pp.85-109
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• 2019

Various Mesozoic igneous rocks such as biotite granite, leucogranites, granodiorite, hornblende gabbros, quartz gabbros and tonalite are identified in the Dangjin area, the western Gyeonggi Massif, Korea. The major Mesozoic igneous activities in the Dangjin area are recognized as periods of ca. 227 Ma, ca. 190 Ma, ca. 185 Ma and ca. 175 Ma. Gabbroic rocks consist mainly of hornblende gabbros and quartz gabbros which are characterized by dominant hornblende and occur as small stocks. The gabbroic rocks have intrusion ages between 185 and 175 Ma. Triassic biotite granite ($225{\pm}2.3Ma$) is considered to be a post-collisional granite similar in geochemistry to the southern Haemi granite ($233{\pm}2Ma$, Choi et al., 2009). Although the main magma source of biotite granite appears to be a granitic continental crust, the biotite granite could have a small amount of mafic rocks as a magma source, or a small amount of mantle-derived melts (i.e., mafic melts) could have contributed to the formation of primitive granite magma in composition. Jurassic granitoids and gabbroic rocks in the Dangjin area are considered to be continental arc igneous rocks associated with the subduction of the Paleo-Pacific plate. It is presumed that the leucogranites are formed by crustal anatexis of granitic materials and the gabbroic rocks are formed by partial melting of enriched mantle.

• Journal of Korean Society of Forest Science
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• v.101 no.2
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• pp.324-332
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• 2012

The purpose of this study was to evaluate the effects of container types on seedling growth of Betula costata, Liriodendron tulipifera, Fraxinus rhynchophylla, Fraxinus mandshurica, Zelkova serrata, and Ulmus parvifolia in the container nursery system. We used three container types [20 cavities (150 seedlings/$m^2$-400 mL), 24 cavities (200 seedlings/$m^2$-320 mL), and 35 cavities (260 seedlings/$m^2$-240 mL)] and measured root collar diameter (RCD), height, biomass, seedling quality index (SQI), and root density. The root collar diameter, height, biomass, SQI, and root density of seedlings were the highest at 20 cavities/tray in all six species because this container type has the largest volume and lowest seedling density. However, F. rhynchophylla growth at both 20 and 24 cavities/tray, Z. serrata growth at both 24 and 35 cavities/tray and B. costata growth at all sizes were not significantly different. As expected, container volume was positively correlated with RCD, height, and biomass of five species except for Z. serrata, but seedling density negatively did. Based on these results, 20 cavities/tray are optimal for L. tulipifera, F. mandshurica, and U. parvifolia, 20 or 24 cavities/tray for F. rhynchophylla, 24 or 35 cavities/tray for Z. serrata, and 35 cavities/tray for B. costata, respectively. Usage of optimal container will make us get good quality seedlings as well as reduction of production costs in the container nursery.

• Journal of the Korean Institute of Gas
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• v.20 no.4
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• pp.15-24
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• 2016

In the semiconductor industry, the risk of chemical accidents due to miscibility between the many types of chemicals and leakage of toxic chemicals has increased. In order to evaluate the reactivity with miscibility of chemicals, experimental method is the most reliable, but there is a time and cost limitations to be evaluated through experiment all the chemicals. In the study, the reactivity of process gases in the semiconductor industry was considered by the CRW (Chemical Reactivity Worksheets) 3.0 program developed by US NOAA (National Oceanic and Atmospheric Administration) and EPA. The reactivity informations with the miscibility of process gases for semiconductor industry provided, and also a KOSHA guide for the storage/separation of gas cylinders in dispensing cabinets in the semiconductor industry was proposed.

• Proceedings of the Korean Fiber Society Conference
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• 2003.04a
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• pp.283-286
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• 2003

PCP(pentachlorophenol)는 독일 법규 혹은 에코라벨 부여기준 시 고려되는 항목으로서, 인체에 유해한 물질로 규정되어 섬유제품 내에 0.5 ppm 이상 존재해서는 안 되며 특히, 유아복은 0.05 ppm 이하로 검출되어야 한다. 유럽 수출시 PCP의 검출로 인해 수출 장벽이 되었던 한 원단제품의 경우를 보면, 외국 시험기관에서 positive 혹은 negative의 판정만을 알려주므로, 원단을 생산한 염색공장이나 원단을 구매하여 수출한 바이어 모두 해결책을 찾기에 애로사항이 있는 경우가 적지 않게 발생하고 있다. (중략)

• Proceedings of the Korean Institute of Industrial Safety Conference
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• 2003.05a
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• pp.289-296
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• 2003

산업발전과 신제품 개발에 따른 연구업무의 중요성이 증가함에 따라 실험실의 수행 업무도 복잡 다양해져 새로운 형태의 잠재위험 요소가 증가되고 있다 실험실의 위험요소는 기계·물리적, 화학적 및 생물학적 위험이 있으며, 주로 화재·폭발, 중독 둥 실험실 사고에 따른 인명손실이 발생되고 있어 실험실 사고예방을 위한 자율적인 실험실 안전관리를 위한 노력이 필요하다. 또한, 실험실에서 사용되는 각종 유해화학물질, 설비 및 기기사용에 따른 위험성 등 실험실의 안전보건에 관한 관심이 고조되고 있다.(중략)

• Proceedings of the Korea Contents Association Conference
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• 2017.05a
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• pp.325-326
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• 2017

물은 색, 맛, 향이 없는 물질이지만 인간을 구성하는 주요 요소이며 모든 생명력의 근원이다. 물은 여러 성질을 지니고 있지만 그 중 물의 운동성에서 호기심이 자극된다. 또한 물은 형체가 없을 뿐만 아니라 스스로의 운동성이 없고 물과 에너지의 관계는 어떤 면에서 무용수와 안무가의 관계와 많은 유사성을 가지고 있다. 무용수는 안무가의 의도와 만나 움직임으로 표현하며 그 움직임들은 각 무용수 개성에 따라 또 다른 이미지를 발산하게 된다. 본 연구는 심상으로부터 인지되는 수류(Flow of Water)가 다양한 움직임의 이미지로 만들어지는 과정을 표현한다.

• Proceedings of the Korean Institute of Industrial Safety Conference
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• 2002.05a
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• pp.143-148
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• 2002

산업발전에 다른 연구업무의 중요성이 증가함에 따라 실험실의 수행업무도 복잡 다양해져 새로운 형태의 잠재위험 요소가 증가되고 있다. 실험실의 사고는 기계$\cdot$물리적, 화학적 및 생물학적 위험이 있으며, 주로 화재$\cdot$폭발사긴 등 인명손실이 발생되고 있어 실험실 위험 평가에 대한 필요성이 고조되고 있다 또한, 실험실에서 사용되는 각종 유해화학물질, 설비, 및 기기사용에 따른 위험성 등 실험실의안전보건에 관한 관심이 고조되고 있다.(중략)