• Resources Recycling
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• v.22 no.1
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• pp.48-54
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• 2013

A laboratory study was carried out to recover KI crystals with high purity by using fractional crystallization method from a waste solution generated from the production of polarizing film for LCD industry. The waste solution contains 1.3% KI, and other impurities such as B, Na, and PVA etc. With purity higher than 99.5% KI crystals were produced through refining process such as vacuum evaporation, fractional crystallization, filtering, and 24hr aging. Also the concentrated impurities were eliminated about 70% by recrystallization.

• Proceedings of the Korean Information Science Society Conference
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• 2002.04b
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• pp.457-459
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• 2002

뜻풀이에서 추출한 의미 정보를 이용만 통계시인 방법의 기존 동형이의어 분별 시스템에는 불필요한 의미 정보들을 많이 가지고 있었다. 그리고 동형이의어간의 의미정보가 서로 교차하는 부분이 많아 확률적인 결정에 오류를 발생시켰다. 본 논문에서는 뜻풀이에서 구문패턴을 분석하여 보다 정제된 의미 정보를 추출하였고, 구문패턴에 속하는 어휘들의 하위어를 사전에서 자동 추출하여 부족한 의미 정보를 보완하였다. 또한, 구문패턴으로 분별할 수 없는 일부 동형이의어들은 순환 뜻풀이 망(RDN)을 이용하여 동형이의어를 분별하였다. 이러한 방법으로 동형이의어 분별을 통해 기존 연구보다 8%의 정확률 향상을 가져왔다.

• Proceedings of the KSEEG Conference
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• 2007.04a
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• pp.605-605
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• 2007

• Clean Technology
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• v.28 no.2
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• pp.103-109
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• 2022

Nd-Fe-B waste permanent magnet contains about 20~30% rare earth elements and about 60~70% iron elements, and the rare earth and iron components were recovered through sulfuric acid leaching and fractional crystallization. Oxidation roasting was not performed for separation and recover of the rare earth and iron elements. The leaching characteristics were confirmed by using as variables the sulfuric acid concentration and the mineral solution concentration ratio. Sulfuric acid leaching was carried out for 3 hours for each sulfuric acid concentration. The leached solid phase was characterized for its crystalline phase, composition, and quantitative components by XRD and XRF analysis, and the filtrate was analyzed for components by ICP analysis. With sulfuric acid leaching at 3M sulfuric acid concentration, neodymium compounds were formed, the iron content was the least, and the recovery rate was high. After the filtrate remaining after sulfuric acid leaching was subjected to fractional crystallization through evaporation and concentration, the neodymium component was found to be concentrated 7.0 times and the iron component 2.8 times. In this study, the recovery rate of waste permanent magnets through sulfuric acid leaching and a fractional crystallization method without an oxidation and roasting process was confirmed to be about 99.4%.

• The Journal of the Petrological Society of Korea
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• v.27 no.3
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• pp.121-138
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• 2018

We have examined the petrotectonic setting and magmatic evolution from petrochemical characteristics of major and trace elements for the Cretaceous volcanic rocks in and around the Mireukdo Island. The volcanic rocks, can be devided into Jusasan, Unmunsa, Yokji and Saryang subgroups on the ascending order, are classified as basalt, basaltic andesite, andesite, dacite and rhyolite on TAS diagram. Petrochemical data show that the rocks are calc-alkaline series, and suggest that erupted earlier medium-K series and later high-K series. The volcanic rocks provide a case in which the calc-alkaline magma are formed, not only from separate protoliths, but following separate paths from source to surface. Earlier and later subgroups take different paths to the surface respectively, and are emplaced in the shallow crust as a series of discrete magma chambers through the volcanic processes. After emplacement, each chamber evolves indepently through fractional crystallization with a little assimilation of wall rock. The volcanic rocks have close petrotectonic affinities with orogenic suite and subduction-related volcanic arc. The rhyolitic magma can be derived from calc-alkaline andesitic magma by fractional crystallization with crustal assimilation, which may be derived from a partial melt of peridotite in the upper mantle.

• Resources Recycling
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• v.21 no.2
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• pp.53-58
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• 2012

A laboratory study was carried out to recover KI crystals with high purity from a waste solution generated from the production of polarizing film for LCD industry. The waste solution contains 1 to 4% KI, and other impurities such as B, PVA and etc. More than 95% purity of KI crystals were produced through refining process such as vacuum evaporation and fractional crystallization. Most of B compounds and impurities were removed by concentrating the waste solution until KI content reached about 50%. The KI crystals were washed with solvents to remove most of PVA which gave result in producing 99.5% purity of crystals. The overall recovery of KI was about 90% during the concentration process.

• Proceedings of the Korea Information Processing Society Conference
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• 2000.04a
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• pp.83-88
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• 2000

본 논문은 mobile agent 시스템 설계의 예를 보인다. 본 시스템 설계에서 구축될 시스템의 사양은 자연어로 묘사되어 있다고 가정한다. 본 시스템 설계 과정은 다음과 같다. 첫째, 시스템 사양으로부터 필요한 사이트들을 분별하고, 둘째, 사이트간에 송수신 되는 정보들을 분별해, 이들 정보 개체들을 각각 한 개의 agent로 구현한다. 셋째, 각 Agent가 수행할 과업을 Petri net으로 정확히 표현한다. Agent가 정의되는 위치에 따라 필요한 통신량이 좌우됨으로 통신량을 최소화시키는 관점에서 Agent 정의의 위치를 결정한다.

• Economic and Environmental Geology
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• v.27 no.5
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• pp.459-467
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• 1994

The Gadaeri granite near Ulsan mine is an oval-shape isolated granitic body, and is genetically related to the iron-tungsten mineralization. The Gadaeri granite exhibits calc-alkaline and I-type characteristics, and generally shows the micrographic texture which indicates the shallow depth of emplacement. Consideration of the stratigraphic thickness of Ulsan formation and minimum-melt compositions suggests that the bulk magma crystallized at pressure of 0.5~2.0 kbar under water saturated condition. The evolutionary trend observed in the studied rocks represents that feldspar fractional crystallization has been a major magmatic process at the Gadaeri granite pluton. Different chemical characteristics between the Gadaeri and the Masan-Kimhae granites cannot be explained by fractional crystallization or different degrees of partial melting, and it reflects that the magma source for Gadaeri granite was different from that of the Masan and Kimhae granites.

• Proceedings of the Korea Water Resources Association Conference
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• 2008.05a
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• pp.1254-1258
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• 2008

본 연구에서는 대표적인 준분포 장기유출모형으로 널리 쓰이는 SWAT-K와 HSPF를 이용하여 충주댐유역을 대상으로 2000년부터 2006년까지의 총유출량 산정을 산정하고, 두 모형간의 총 유출량 차이를 분석하기 위해 증발산량, 지표유출량, 중간유출량, 기저유출량 등 각 수문성분별 모의결과를 비교하고, 모형별 유출특성을 분석하였다. 모의기간 연평균 유출량은 SWAT-K는 관측치에 비해 약 2%과다, HSPF는 약 3% 과소하게 모의되었고 모형의 적용 타당성을 가늠할 수 있는 결정계수는 SWAT-K가 0.78, HSPF가 0.88로 나타났다. 수문성분별로 모의치를 비교한 결과 중간 유출은 SWAT-K가, 지하수유출은 HSPF가 크게 산정되는 등 수문성분별 크기에 차이를 드러냄에 따라, 각 모형에서 수문성분을 도출하는 구조의 차이와 계산과정 등의 상세한 비교분석이 필요한 것으로 판단된다.

• The Journal of the Petrological Society of Korea
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• v.5 no.2
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• pp.188-199
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• 1996

Boeun granodiorite, which intruded into the metasedimentary rocks of the Ogcheon Group, show chemical natures of metaluminous and calc-alkaline. Generating and emplacing environment of the Boeun granodiorite would have been a active continental margin. Comparing to the contemporaneous Inje-Hongcheon granodiorite in the Gyeonggi massif, the Boeun granodiorite seems likely to have formed under more immature continental arc environment. Compositional changes of major, trace and rare earth elements in granodiorite and felsic dyke are not certain to indicate crystallization differentiation. From this fact, the simple fractional crystallization model would be in question to explain the magma process which controlled the formation of the Boeun granitic mass. The model calculations for Rayleigh fractionation, fractionation with variable major-component composition, assimilation-fractional crystallization (AFC) were carried out to examine the magma process of the mass. The results of former two models do not agree with the compositional variations in the mass. The AFC model can be, however, applied to the magma process. The conditions for AFC process are (1) composition of assimilated wallrock is similar to that of primary magma. (2) assimilating rate is similar to crystallizing rate, and (3) mass of assimilated wallrock is about 10% of that of the magma. These conditions deny a possibility that the assimilated wallrock was the metasedimentary rocks of the Ogcheon Group. This indicates that after having experienced the assimilation process in deeper crust, the granodiorite magma intruded into the Ogcheon group. Every model calculating suggests that the felsic dyke was differentiated not from the granodiorite magma, but from a different source magma.