• 자원환경지질
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• 제43권5호
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• pp.523-528
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• 2010

미국발 금융위기 여파로 세계경제가 침체되변서 LME의 base metal 가격이 2008년 4/4, 분기 급락하였으나, 2009년 1-7월 거시경제 회복신호와 함께 base metal 가격이 다시 상승세를 보였다. Base meta1 상승 배경에는 미국 기업들의 개선된 실적 발표로 산업생산 및 제조업지수가 개선된 것 미달러화 약세로 인한 원자재 가격 상승, 그리고 무엇보다도 세계 금융 위기 속에도 경제성장을 위한 중국의 원자재 수요 증가가 주요 원인으로 꼽힌다. 이에 본 논문에서는 base metal 가격상승에 주요 base metal소비국의 수요가 영향을 주었는지를 중국 및 주요국 경제성장률을 가지고 회귀분석 하였다. 분석결과 중국의 경제 성장만이 LME시장의 base metal 가격상승에 영향을 주는 것으로 나타났다. 하지만 이런 결과에도 불구하고, 그동안 중국 상품의 주요 소비시장이었던 미국, 유럽 동 선진국들 경제의 본격적인 회복 없이 중국경제만으로 base metal 가격 상승랠리가 지속될지 여부를 보고자 한다.

• 지역연구
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• 제9권2호
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• pp.27-40
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• 1993

Most studies on regional economic impact have utilized employment or employment income data. Recently, a few scholars have noticed the importance of nonemployment income sources in urban economies. Using decennial census data on Arizona towns from 1970 to 1990, this paper first examines the increasing importance of nonempolyment income sources in urban economies and the associations of nonemployment income sources with elderly population and metropolitan location. Then, this paper investigates the impact of nonemployment income on urban growth in the framework of economic base model. The regression results show that the impact of nonemployment income is significant in the increase of nonbasic income and becomes greater over time, and that the impact of transfer over time, and that the impact of transfer income on nonbasic income of transfer income on nonbasic income is stronger in smaller towns and the impact of investment income is stronger in larger towns.

• Earthquakes and Structures
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• 제22권2호
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• pp.109-120
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• 2022

Older or damaged structures can require significant retrofit to ensure they perform well in subsequent earthquakes. Supplemental damping devices are used to achieve this goal, but increase base shear forces, foundation demand, and cost. Displacement reduction without increasing base shear is possible using novel semi-active and recently-created passive devices, which offer energy dissipation in selected quadrants of the force-displacement response. Combining these devices with large, strictly passive energy dissipation devices can offer greater, yet customized response reductions. Supplemental damping to reduce response without increasing base shear enables a net-zero base shear approach. This study evaluates this concept using two incremental dynamic analyses (IDAs) to show displacement reductions up to 40% without increasing base shear, more than would be achieved for either device alone, significantly reducing the risk of response exceeding the unaltered structural case. IDA results lead to direct calculation of reductions in risk and annualized economic cost for adding these devices using this net-zero concept, thus quantifying the trade-off. The overall device assessment and risk analysis method presented provides a generalizable proof-of-concept approach, and provides a framework for assessing the impact and economic cost-benefit of using modern supplemental energy dissipation devices.

• 경영과학
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• 제27권2호
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• pp.21-29
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• 2010

We consider an economic approach for spectrum operations in mobile networks. We present the investment function of base stations according to the number of FAs assuming the linearity of cell splitting. We show that there is an economic amount of spectrum which corresponds to the optimal number of FAs that minimizes the investment. We analyze the impact of the cost structure and the traffic distribution in base stations on the economic amount of spectrum. This paper is applicable to an economic spectrum operation for mobile operators. In addition, the national regulatory authority can use the economic amount of spectrum as the minimal amount for spectrum allocation.

• Earthquakes and Structures
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• 제9권3호
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• pp.603-623
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• 2015

The scale and nature of the recent earthquakes in the world and the related earthquake disaster index coerce the concerned community to become anxious about it. Therefore, it is crucial that seismic lateral load effect will be appropriately considered in structural design. Application of seismic isolation system stands as a consistent alternative against this hazard. The objective of the study is to evaluate the structural and economic feasibility of reinforced concrete (RC) buildings with base isolation located in medium risk seismic region. Linear and nonlinear dynamic analyses as well as linear static analysis under site-specific bi-directional seismic excitation have been carried out for both fixed based (FB) and base isolated (BI) buildings in the present study. The superstructure and base of buildings are modeled in a 3D finite element model by consistent mass approach having six degrees of freedom at each node. The floor slabs are simulated as rigid diaphragms. Lead rubber bearing (LRB) and High damping rubber bearing (HDRB) are used as isolation device. Change of structural behaviors and savings in construction costing are evaluated. The study shows that for low to medium rise buildings, isolators can reduce muscular amount of base shears, base moments and floor accelerations for building at soft to medium stiff soil. Allowable higher horizontal displacement induces structural flexibility. Though incorporating isolator increases the outlay, overall structural cost may be reduced. The application of base isolation system confirms a potential to be used as a viable solution in economic building design.

• 한국항만경제학회지
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• 제19권2호
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• pp.177-202
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• 2003

Balassian Approach of regional economic integration has been mainly aimed at improving conditions for regional trade since 1960s. After the financial crises of the late 1990s, however, the theoretical approach to regional integration will have to be a different one as regionalism have to offer enhanced protection against crises. The aim of this paper, above all, is to provide a theoretical framework for the emerging new monetary regionalism. Regions that wish to strengthen their co-operation in monetary and financial affairs today have the option of monetary regionalism without trade agreement. East Asian region will become an increasingly important domain within which to explore enhanced protection against financial crises. And as Korea seems to play a crucial role in building regional integration among ASEAN＋3(Korea, China and Japan) countries, alternative policy for Korean economy to be the North-east Asian Economic Base need to be schemed on the basis of Balassian as well as monetary regionalism.

• 대한건축학회논문집:구조계
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• 제35권1호
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• pp.47-56
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• 2019

As the zero interest rate era was over with the end of quantitative easing, the economy of several global markets observed the fluctuations of the base interest rate. Interest rate, which is the change of money value with respect to time, is negatively correlated with construction investment. Considering the characteristics of interest rates and construction investment as economic variables, the necessity of cross-border analysis between base interest rate and construction investment was suggested in this paper. Cross-correlation analysis between base interest rates and construction investment crossing the border was performed. The effective correlations were confirmed with values varying by countries. Similar characteristics were also observed among countries with similar economy, which were then divided into three groups. Additionally, identifying the base interest rate that affects the construction investment of a particular country was made possible by reflecting a self-cycle of base interest rates. Lastly, from the result of examining the influence of each rise and fall of the interest rate, it was verified that the difference was more than twice as large in some countries. These results are expected to contribute to construction-related policy makers or investors to make decisions in response to the economic status of the construction market.

• 지역연구
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• 제35권4호
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• pp.3-18
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• 2019

이 논문은 농촌중심지들을 대상으로 직접설문조사를 시행하여 경제기반승수를 산출하고, 간접추정 방법들을 적용하여 추정한 경제기반승수와 비교하는 것이 주목적이다. 한국의 경제기반 연구에서 직접조사 방법은 본 연구에서 처음 시도되는 것이다. 연구대상지로는 청원군(현 청주시) 5개 면을 선정했으며, 해당 면지역의 직접조사 자료와 사업체 기초통계조사자료를 이용하여 경제기반승수를 추정하였다. 경제기반이론을 실제 사례에 적용하는 직접조사 방법을 통해서 정확한 경제기반승수를 산출하고, 간접적으로 추정한 승수값과 비교하여 간접추정 방법들의 장단점을 검토해 보았다. 임의가정 방법, 입지계수 방법, 최소요구치 방법 등 경제기반승수의 간접추정 방법들은 기본가정에 문제점이 있지만 최소요구치 방법이 다른 방법보다는 현실적 가정 측면에서 우월하며, 가능하다면 직접조사를 하고 역외 통근자와 역내 통근자 자료를 반영하면 더욱 정확한 승수를 추정할 수 있다.

• 복식
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• 제56권1호
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• pp.56-69
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• 2006

The purposes of this study were to identify cosmetics purchasing behavior according the 20-30 year old men's lifestyle. The results were as follows; 1. The factors of men's lifestyle were sense of fashion, participation of social activities, use of web-based information, sense of androgyny, economical efficiency, provision of web-base information, sport activities, and pursuit of change, and they were segmented into a passive stagnant group, a economic web-base information utilizing group, a positive social activity participation group, and a sensitive appearance change pursuit group. 2. Passive stagnant group used less information sources patronized cosmetics specialty store, did not select their cosmetics by themselves, and spent less for their cosmetics. Economic web-base information utilizing group used information sources positively, patronized cosmetics discount store or internet shopping, and spent less for cosmetics. Positive social activity participation group patronized cosmetics specialty store or discount store, but did not select cosmetics by themselves. Sensitive appearance change pursuit group patronized department store or internet shopping for cosmetics, selected cosmetics by themselves, and spent more. 3. Passive stagnant group showed a tendency of older, less educated, and lower incomes, but economic web-base information utilizing group were among the age of 20's, lower educated, and the unmarried with average incomes. Positive social activity participation group showed a tendency of older, highly educated, and the married with jobs, but sensitive appearance change pursuit group were among the age of 20's and university students with more incomes and pocket money.

• 대한토목학회논문집
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• 제13권2호
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• pp.85-93
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• 1993

구조물의 진동을 제어하기 위하여 널리 활용되고 있는 기초분리시스템(base isolation system)는 대상구조물에 경제적이며 효율적으로 적용할 수 있는 장점을 가지고 있다. 본 연구에서는 가장 널리 쓰이고 있는 적층(積層)고무받침(laminated rubber bearing) 방식의 기초분리장치(base isolator)를 제작하여 이에 대한 정적 및 동적 특성실험을 수행하였다. 실험으로부터 얻어진 결과를 통하여 제작된 기초분리 장치의 정적 및 동적특성을 분석하였으며 실제 구조물에 대한 기초분리장치로서의 적용가능성을 고찰하였다. 최종적으로 기초분리장치에서 나타나는 비선형 힘-변위 이력곡선을 수치적으로 이상화하여 실험결과와 비교하였다.