• 자원환경지질
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• 제20권4호
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• pp.223-234
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• 1987

This paper describes the mode of occurrence and mineralogical properties of electrum from the Namseong Gold-Silver deposits, for the purpose of obtaining data on the characteristics of the ore deposits and the behavior of gold and silver during the mineralization. The gangue minerals are quartz, calcite, fluorite. Ore minerals are mainly composed of pyrite, sphalerite, chalcopyrite and galena with minor amount of argentite, electrum, pyrargyrite, native silver and unidenfied mineral(Cu-Fe-Ag-S series). Three stage of mineralization recognized are, from early to later, (I) pyrite-electrum stage (II) sphalerite-chalcopyrite-galena-argentite-electrum stage (III) sulfosalts stage. The filling temperature of fluid inclusions in quartz ranges from $225^{\circ}$ to $335^{\circ}C$. The value of sulfur fugacity estimated by means of electrum-tarnish method ranges from $10^{-11.5}$ to $10^{-14}$ atm. The compositional heterogeneity within a single grain with respect to gold concentration is common in the Namseong electrums Chemical composition of electrum ranges generally between 25~45 atom% Au. Its gold content decreases in late stages of mineralization.

• 자원환경지질
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• 제21권2호
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• pp.117-129
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• 1988

The purpose of this study is to determine the stratigraphy of the volcanic rocks in the Chilpo-Weolpo area, the north of Pohang basin, based on field survey and lithological properties of the rocks. The volcanic pile(Chilpo tuff) overlies the Cretaceous sedimentary formation and is unconformably overlain by the Miocene Yeonil Group. The Chilpo tuff comprises a thick sequence(>200m) of pyroclastic flow deposits. Five members are distinguished, each representing separate flow units, comprising none(or weakly) to densely welded rhyolite tuff. The Chilpo tuff consists of, in ascending order, greenish weakly welded tuff, volcanic conglomerate, alternation of tuff breccias and fine tuffs, greenish none to densely welded tuff and red-brownish densely to weakly welded vitric tuff. This study revealed that the volcanic rocks in this area were formed by 4 volcanic stages. On the basis of K-Ar age($44.7{\pm}1.1\;Ma$) and lithologic data, geological age of the Chilpo tuff may be Eocene.

• 대한전기학회논문지:전력기술부문A
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• 제48권7호
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• pp.872-880
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• 1999

This paper presents an algorithm that can calculate the evaluation index of power system from the transfer capability point of view. The algorithm adopts a successive linear programming skill to solve an optimal solution. Two indices which are transfer margin index and economic matching index have been developed. Prior to calculating these indices, Maximum Load supplying Capability(MLSC) and Economic Load Supplying Capability(ELSC) are utilized as basic data. For man-machine interface, graphical user interface has been implemented so that an unified software package PSTCP(Power System Transfer Capability Program) has been developed. KEPCO systems planned up to 2006 year have been tested to show effectiveness and usefulness of the PSTCP for power system planning stages.

• 대한가정학회지
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• 제30권1호
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• pp.199-217
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• 1992

The purpose of this study was to examine changes in the household investment planning according to the family life cycle, to improve the household investment planning process, and to develop research model. The results were as follows : Household investment planning varied with stages of the family life cycle because the stock of resources shifted and financial goals changed as the family life cycle stage changed. The main financial goals of family in each stage of the life cycle were the purchasing of house in the establishing stage, children's education and marriage in the extending stage, and the elderly's economic welfare in the diminishing stage. Also, in the Ⅰ & Ⅱ stage the most important investment goals were the purchasing of house, children's education in the Ⅲ stage, children's marriage in the Ⅳ stage, and the elderly's economic welfare in the Ⅴ stage. Therefore, the financial goals were recognized as the important goals underlain the investment-planning goals, and alternatives for the accomplishment of investment-planning goals were determined. The results of this study can contribute to establish the long-run investment planning process and improve the level of household's financial well-being.

• 대한가정학회지
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• 제38권2호
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• pp.91-107
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• 2000

The purpose of this study is to understand the familial and economic problems(household-financial management) came out as a result of inheritance in household with a qualitative Ethnographic interview analysis method. As a result of interview, we found out three results; first, inheritance consciousness, attitude of predecessor(parents generation) second, the changes in familial economic relationship by inheritance stages (pre-inheritance stage, inheritance progressing stage, post-inheritance stage) third, the emotional changes of predecessor(paraents generation). The results indicated that there were significant importance and influence of household inheritance, therefore, the necessities of definite and systemic old-aged plan with financial management of inheritance should be introduced.

• 국제학술발표논문집
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• The 6th International Conference on Construction Engineering and Project Management
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• pp.445-449
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• 2015

Construction industry is one of the most significant sector in national economic, but the portion of construction has been falling regularly with the regional development. In spite of decrease in economic portion, role of construction industry does not changed irrespective of development, as the foundation of development. To distinguish each state of the maturity, countries are grouped on GDP per capita, than compared with variance of GVA in construction and GFCF per GDP as level of construction industry. GVAc% and GFCF% shows corn-shaped plotting in increase of GDP per capita, and each value converge to around 20% and 5% as GDP per capita increase. The definition of maturity is consist of 4 stages; pre-developing, ascending, stabilization, and maturement. Maturity of construction industry is a term of broad sense of construction industry that is easily to figure current state of regional construction and shows what normal condition of construction is in regional economy.

• International Journal of Industrial Entomology and Biomaterials
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• 제34권2호
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• pp.23-31
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• 2017

Bumblebees, more efficient than honeybees, provide important services for pollination especially in tomato, pepper, cucumber, strawberries and other crops grown under tunnel farming or glasshouse conditions to yield maximization. These bees require pollen and nectar to meet their dietary needs and maintain their colony structure, development and reproduction. Keeping in view their economic importance, the effect of five concentrations of sugar and honey solutions (1:1, 1:1.5, 1:2, 2:1,1.5:1) each as alternative to nectar were used to observe their effect on life history parameters of Bombus terrestris. The 1:1 ratio of sugar solution was found most effective followed by 1.5:1, 1:1.5, 1:2 and 2:1 and also more effective of all five concentrations of honey solutions on all three stages of colony development i.e., at colony initiation, colony development and colony maturation stages. At colony initiation stage, early pre-oviposition period ($6.40{\pm}0.97$ days), early emergence of first worker in the first batch ($25.40{\pm}1.21$ days) and maximum numbers of workers ($6.20{\pm}0.24$) emergence in the first batch were observed at 1:1 ratio of sugar solution. Colonies reared on 1:1 ratio of sugar solution reached earlier ($52.13{\pm}1.28$ days) at colony foundation stage with minimum mortality ($3.27{\pm}0.54$ workers). At colony maturation stage, maximum numbers of workers, sexual (males, queens) and maximum mother queen longevity was observed at the same 1:1 ratio of sugar solution. It can be suggested from present study that sugar solution as alternative of nectar at 1:1 ratio was better than other sugar concentration levels and also from those of honey solution.

• 한국산업정보학회논문지
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• 제25권1호
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• pp.71-87
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• 2020

새로운 고용창출과 경제성장의 핵심동력으로서 스타트업의 중요성이 더욱 강조됨에 따라 본 연구는 국내 스타트업의 현황과 성공요인을 분석하고자 하였다. 스타트업으로 시작해 유니콘기업으로 성장한 (주)우아한형제들의 성공요인을 ERIS모델과 성장단계별 모델로 구분하여 성공요인을 도출하였다. ERIS모델 성공요인은 창업자요인과 독특한 문화를 고유한 자원으로 인식한 자원요인, 블랜딩을 통한 산업환경 요인과 사업 확장으로 플랫폼 다각화를 진행한 전략요인이 주축이 되었다. 성장단계별 성공요인은 기존의 경쟁자와 차별화를 두었다는 점이며 상업화단계에서는 새로운 사업모델이 시장의 신뢰를 얻으면서 수익을 상승시켰고, 젊은 층의 공감을 얻은 공격적인 마케팅은 국내·외 투자사로부터 대규모의 투자금을 유치할 수 있었고, 성장단계에서는 매니아 중심의 마케팅을 유지하면서 플랫폼 다각화 전략을 펼친 것이 중요한 성공요인으로 작용하였다. 이와 같은 (주)우아한형제들의 성공요인 분석이 더 많은 국내 유니콘기업의 탄생을 위한 밑거름이 되었으면 하는 바램이다.

• 국제지역연구
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• 제16권3호
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• pp.323-341
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• 2012

최근 중국에 있어서 지속적 발전을 위한 중요한 이슈로 도시화가 대두되고 있다. 다른 국가와 마찬가지로 중국의 도시화도 국내시장의 발전, 산업구조의 개선 그리고 지역간, 도 농간 소득격차의 축소와 밀접한 관계를 갖고 있다. 본 연구는 중국의 성시 중에서 가장 먼저 해외투자가 진행되었고 그로 인하여 각종 산업이 상대적으로 빨리 발전한 동부해안지역과 중국지역전체(통합)를 대상으로 하여 이들 지역 및 전체의 도시화와 경제성장의 관계를 분석하여 Williamson의 가설이 적용되는 지를 파악하고자 하였다. 이를 위하여 연구대상지역의 횡단면 자료와 시계열 자료를 활용하였다. 본 연구의 결과 10개 성 시(城 市)자료를 사용한 동부지역은 경제성장에 대한 도시화의 영향이 나타나고 있음을 확인하였다. 회귀분석의 결과는 추정방법에 관계없이 Williamson가설이 명확하지 않은 것으로 나타났다. 그러므로 분석결과는 경제성장에 대한 도시화의 영향이 중국의 동부해안지역에서 역 U자형이 아님을 보여주었다. 한편 중국통합모형에서도 비슷한 결과를 보여주고 있어 아직도 도시화가 경제성장에 영향을 주고 있는 것으로 판단할 수 있다.

• 국제지역연구
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• 제16권1호
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• pp.147-171
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• 2012

2000년 이후 오늘날에도 중국, 인도 등을 비롯한 신흥시장국의 경제규모가 날로 확대되면서 국제적으로 석유에 대한 수요가 크게 증가해온 반면 그 공급은 주요 산유국인 중동국가의 정세불안 등으로 차질이 발생하는 상황이 빈발함에 따라 스태그플레이션 위험은 항상 개연성이 높은 경제현상으로 인식되고 있다. 그러나 일반 사람들이 고유가가 지속되는 시기에 흔히 높은 인플레이션과 경기침체가 공존하는 현상을 스태그플레이션으로 쉽게 거론하더라도 스태그플레이션에 관한 학술적인 정의는 분명하지 않으며 현실적인 경제통계의 흐름을 보고 그러한 상황을 식별하기도 쉽지 않다. 본고에서는 경기국면으로서 스태그플레이션의 상황을 보다 구체적으로 정의한 연구사례들을 면밀히 살펴보고 월별로 조기에 입수 가능한 경제통계들을 종합하여 스태그플레이션의 상황을 체계적으로 식별할 수 있는 방법론을 제시하였다. 경기상황, 인플레이션 상황을 나타내는 월별 통계지표를 이용하여 스태그플레이션 상황을 나타내는 정도를 평가한 후 이 결과를 종합하여 스태그플레이션 종합지수를 산출하였다. 그 결과 한국에서 스태그플레이션 여부에 대한 논란이 많았던 2008년 상반기가 엄밀한 의미에서 스태그플레이션 상황은 아니었음을 규명하였다.