• 자원환경지질
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• 제28권6호
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• pp.559-569
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• 1995

Paleomagnetic data have been obtained from the Upper Carboniferous-Permian Komok and Cheolam Groups which are exposed in the E-W trending Baekunsan syncline comprising the Pyongan Supergroup in eastern Korea. Two ancient components of magnetization are recovered in these groups by detailed thermal demagnetization: a post-folding component and a pre-folding component. The post-folding component $(D/I=54.0/54.6^{\circ},\;{\alpha}_{95}=14.6^{\circ})$ is a magnetic signature of the Oaebo Orogeny and appears to have been confined mainly to Cretaceous Normal Superchron. It has been rotated clockwise since this magnetization has been acquired. The pre-folding components ($D/I=341/-9.2^{\circ},\;{\alpha}_{95}=7.2^{\circ})$, paleopole at $335.7^{\circ}E$, $44.6^{\circ}N$ for Upper Carboniferous; $D/I=358.3/11.5^{\circ},\;{\alpha}_{95}=6.3^{\circ})$, paleopole at $311.9^{\circ}E$, $58.7^{\circ}N$ for Permian) pass fold and reversal tests. These paleopoles correspond only with the contemporaneous poles from the North China Block: they are removed from the poles from the South China Block. If the results of this study are corrected for the clockwise rotation deduced from the prefolding component, the enhanced agreement with North China Block can be achieved. Therefore, a first-order correlation between the Korean Peninsula and North China at least since Upper Paleozoic times is identified in this study.

• 자원환경지질
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• 제26권3호
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• pp.383-393
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• 1993

Paleomagnetic data have been obtained from the Lower Triassic Tonggo formation which is exposed in the E-W trending Baekunsan syncline comprising the Pyongan Supergroup in eastern Korea. Two ancient components of magnetization are recovered in this formation by detailed thermal demagnetization: a post-folding component and a pre-folding component The post-folding component ($D/I=58.8/55.5^{\circ}$) is normally magnetized and appears to acquire in the Cretaceous Normal Superchron. It is a magnetic signature of the Daebo Orogeny and has been rotated clockwise since this magnetization has been acquired, in common with the main synclinal axis. The pre-folding component ($D/I=1.1/19.4^{\circ}$, Paleopole at $306.1^{\circ}E$, $63.2^{\circ}N$) passes fold and reversal tests and is inferred to be a post-depositional or early chemical diagenetic remanence of Lower-Middle Triassic age. This paleopole corresponds only with the Lower Triassic poles from the North China Block: it is removed from the contemporary poles from the South China Block. If the result of this study is corrected for the clockwise rotation deduced from the Cretaceous overprint, the enhanced agreement with the Lower Triassic poles from the North China block can be achieved. Therefore, a first order correlation between the Korean Peninsula and North China at least since Lower Triassic times is identified in this study.

• 한국태양에너지학회 논문집
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• 제35권3호
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• pp.81-91
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• 2015

LED has received intensive research attention due to its long life, high efficacy, fast response and wide colour availability, and has secured extensive application areas. However, LED chips within the modules convert only fraction of electric energy into light, and majority of supplied energy needs to be dissipated as heat, which challenges in the performance and life of the LED modules. IEC 62717 specifies the performance requirements for LED modules together with the test methods and conditions. The present study examined the influence of different design parameters on performance temperature through series of experiments and numerical simulations. The economic means to change the module performance temperature during the measurement of mandatory markings were suggested based on predicted cooling performances.

• World Technopolis Review
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• 제2권2호
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• pp.81-95
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• 2013

This paper seeks to build on previous work conducted by Porter, Devol, Florida, Bahrami and Evans, Wennberg and Lindqvist, and others contained in the literature, to construct a new way of looking at innovation cluster development. It seeks to describe the key elements contained in the research that serve as building blocks for innovation clustering, adding analysis dimensions that aim to further illuminate understanding of this process. It compares those building block characteristics to the innovation topography of U.S. urban centers, to shed light on a new framework through which urban innovation cluster formation can be considered. It identifies three building block analysis categories: 1) Technological Capability and Capacity (TCC); 2) Intellectual Propulsion Capacity (IPC); and 3) Structural Creative Inspiration (SCI). These three pillars form the architecture for creation of a Strategic Innovation Network (SIN), upon which clustering can be systematically analysed and built. The purpose of the SIN is to optimally organize and connect all available resources that include physical, financial, and human, such that innovation clustering is inspired, encouraged, nurtured, and ultimately constructed as fully functioning socio-economic organisms that provide both local and regional benefits. It is designed to aid both private enterprise and public policy leaders in their strategic planning considerations, and to enhance urban economic development opportunities.

• Journal of Electrical Engineering and Technology
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• 제2권4호
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• pp.452-460
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• 2007

The interstate electric power system, as an alternative for energy cooperation under regional economic block, was fervently debated prior to the restructuring of electric power industries and rapidly expanded in many regions since the 1990s. Especially, electric power system interconnection in the Northeast Asia region may bring considerable economic benefits since this region has strong supplementation in resource holdings, load shape, fuel mix, and etc. In this paper, we implement the ORIRES model, proposed by ESI of Russia, in order to analyze the economic feasibility on the Northeast Asia Region Electrical System Ties (NEAREST) project.

• 대한전기학회논문지:전력기술부문A
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• 제55권2호
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• pp.76-84
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• 2006

Interstate electric power system, as an alternative for energy cooperation under regional economic block, has been hotly debated before progressing the restructure in electric power industry and rapidly expanded in many regions after 1990s. Especially, since northeast asia has strong supplementation in resource, load shape, fuel mix etc., interconnection of electric power systems in this region may bring considerable economic benefits. This paper implements a mathematical optimization model, ORIRES, proposed by Russia, in analysing the economic feasibility of system interconnection. Additional analyses on the environmental impact of the system interconnection, and sensitivity of key factor inputs have been performed.

• 한국수자원학회논문집
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• 제52권spc2호
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• pp.823-833
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• 2019

This study presents the impact of natural flow patterns on downstream fish habitat and economic outcomes in the Dal Stream, Korea. The study reach is 3.35 km long, located downstream form the Goesan Dam. To assess such impact, this study performed physical habitat simulations. The River2D model was used for the computation of the flow and the HSI model for the habitat simulation. Two physical habitat variables, flow depth and velocity, were used. The Zacco platypus, Zacco temminckii, Coreoleuciscus splendidus, and Opsariichthys bidens were selected as the target species in the study area. Using the building block approach (BBA), the scenarios for the hydropeaking mitigation were presented. Scenario 1 and scenario 2 were proposed by using the magnitude - duration concept and averaged the hydrologic data over the each month, respectively. Simulation results indicated that the scenarios effects significantly increased by about 18.6% for the weighted usable area (WUA). In addition, hydroelectric power benefits with both scenarios were investigated. It was revealed that the change of storing and releasing water decreased by about 27% for hydroelectric power benefits. In order to increase economic benefits, the scenario was modified with the discharges corresponding to the hydropeaking condition except the flood season. As a result, the hydroelectric power benefits were almost the same, however the aquatic habitat for the target species increased by about 5%. The change of dam re-operations through natural flow patterns provides an opportunity to minimize environmental and economic benefits in order to balance water management.

• 자원환경지질
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• 제49권1호
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• pp.31-41
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• 2016

본 연구는 절리의 방향분포가 절리성 암반의 수리적 특성에 미치는 영향을 평가하기 위하여 등가파이프 연결구조에 기반을 둔 이차원 DFN(discrete fracture network) 유체유동 해석 프로그램 코드를 개발하고 수치실험을 수행하였다. 수치실험에 사용된 이차원 DFN 시스템은 경계효과를 고려하여 $32m{\times}32m$ 영역의 중앙에서 $20m{\times}20m$ 크기의 DFN 블록이다. 두 절리군을 사용하여 절리의 빈도와 길이분포를 고정하고 절리군 선주향의 평균과 표준편차를 달리하며 추계론적으로 생성한 총 15개의 DFN 블록에 대하여 매 $30^{\circ}$ 간격으로 회전하면서 총 12 방향으로 구현한 총 180개 DFN 블록에서 블록수리전도도가 산정되었다. 또한, 각각의 DFN 블록에서 이론적 블록수리전도도, 주 수리전도도텐서 및 평균블록수리전도도를 추정하여 비교분석한 결과, 절리군의 평균 교차각이 작을수록 절리 방향분포의 변동성이 이차원 DFN 시스템의 등가연속체 취급 가능성 및 블록수리전도 특성에 더욱 영향을 미치는 것으로 평가되었다.

• 한국항만경제학회지
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• 제19권2호
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• pp.203-219
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• 2003

The world Economy has rearranged into three economic block. Especially, the nation's economy in Northeast area are an engine of world economic development. Among these nations in Northeast area china has done a main role of the development of world economy. Owing to raising of the China economy, the Export-Import of container load has rapidly increased in this area. So it is very important of the nation to manage a port. Therefore, the purpose of this paper is to analysis a port of Masan and to search the way of development. To accomplish this purpose, I will analyze a logistics circumstance in northeast area and a port of Pusan and Jinhae. In conclusion, government and local government must enlarge the investment to develope the port of Masan. Local government should do its best effort to solve the problem of port of Masan. And all citizen should recognize that a development of the port of Masan will be the engine of the raising of Masan.

• 지질공학
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• 제32권4호
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• pp.661-670
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• 2022

기후변화로 인한 극한 강우 및 지구 온난화로 인해 도심지 홍수 및 열성현상 저감을 위한 대책이 필요한 실정이다. 이에 본 연구에서는 보강섬유(아라미드, 탄소섬유)를 이용한 친환경 투수블록을 개발하고자 하였고, 기존의 투수블록과 비교하여 환경문제 및 구조적인 안정성을 확보할 수 있도록 최적의 시멘트 사용량일 줄이고 산업부산물인 고로슬래브 미분말을 사용한 배합비를 개발하고자 하였다. 실험결과, 일축압축시험을 실시한 결과 재령 28일을 기준으로 섬유를 보강하지 않은 경우는 26.1 MPa, 탄소섬유의 경우는 29.4 MPa, 아라미드섬유의 경우는 31.82 MPa인 것을 확인할 수 있었다. 인터로킹 오차시험의 경우 각 구역에서 1.5 cm, 1.6 cm, 2 cm로 적절한 틈이 있는 모습을 확인할 수 있었다. 투수시험의 결과는 섬유가 보강되지 않은 경우 k = 1.12 × 10^-2 cm/sec, 아라미드섬유는 k = 1.13 × 10^-2 cm/sec, 탄소섬유는 k = 1.11 × 10^-2 cm/sec으로 비슷한 것을 확인할 수 있었으며 기준인, 1.0 × 10^-2 cm/sec 보다는 크게 측정된 것을 확인할 수 있었다.