• 전기학회논문지
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• 제58권1호
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• pp.23-27
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• 2009

The joint dispatch of regional electricity markets can improve the overall economic efficiency of interconnected markets by increasing the combined social welfare of the interconnected markets. This paper presents a new decentralized optimization technique based on Augmented Lagrangian Relaxation (ALR) to perform the joint dispatch of interconnected electricity markets. The Block Coordinate Descent (BCD) technique is applied to decompose the inseparable quadratic term of the augmented Lagrangian equation into individual market optimization problems. The Interior Point/Cutting Plane (IP/CP) method is used to update the Lagrangian multiplier in the decomposed market optimization problem. The numerical example is presented to validate the effectiveness of the proposed decentralized method.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 1999년도 가을 학술발표회 논문집
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• pp.113-118
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• 1999

The design program of fitting and thrust block including various shapes and sizes was developed for the GMR project (Great Man-made River Project in Lybia). It can automatically recalculated the minimum size of fitting required for the structural performance and can also determine the proper size of fitting for the safe and economic design by users. It was found that the results of this program was accurate and efficient when it was compared to other references. This program is also developed with GUI (Graphic User Interface) technology for the convenience of users.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2019년도 추계 학술논문 발표대회
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• pp.168-169
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• 2019

Recently, the flooding of rivers caused by rainy season and heavy rains in Korea causes economic and environmental problems such as flood damage and urban flooding. Therefore, in order to solve these problems, local governments use landscaping methods and drainage facilities to prevent them, but they are not perfect solutions. Domestic awareness also lacks awareness to worry about flooding only during rainy seasons and heavy rains, and to worry about or prevent flooding in the region. In order to solve this problem, we recognize the importance of permeable blocks nationwide and replace or install permeable paving materials on most sidewalks. However, since existing permeable blocks used cement as the main material, calcium carbonate is produced when reacted with water. Efflorescence occurs, and the resulting calcium carbonate blocks the pores of the permeation block, causing a decrease in permeability.

• 에너지공학
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• 제21권1호
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• pp.81-85
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• 2012

Electricity is the basic building block of economic development, and constitutes one of the vital infra-structural inputs in socio-economic development. The demand for electricity has been increasing due to extensive urbanization, industrialization, and a rise in the standard of living, as is the case with residential electricity consumption. This paper attempts to estimate the consumer surplus and the economic value of the residential consumption of electricity in Seoul to assist in decision-making in electricity management. The estimated consumer surplus represents the value of the area under the demand curve, above the actual price that is paid for residential electricity consumption. The estimated annual consumer surplus and economic value for the year 2005 amount to 2,144.7 and 3,727.4 billion won, respectively. The estimates per kWh were 184.9 and 316.0 won, respectively, which imply that the consumer surplus and the economic value of residential electricity consumption significantly outweigh the average price of electricity in 2005 of 91.1 won per kWh.

• Ecology and Resilient Infrastructure
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• 제2권2호
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• pp.161-166
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• 2015

최근 생태하천 복원 사업용으로 개발된 호안 공법에 대한 수리학적 설계기준이 부적절하여 이 공법이 적용된 하천에서 홍수기에 큰 경제적 손실을 유발하고 있다. 본 연구에서는 생태복원용으로 개발된 무독성 호안 블록을 실규모 수로에 설치하여 최고 유량 $3.0m^3/s$, 최고 유속 3.0 m/s에서 수리적 안정성을 평가하였다. 설치된 무독성 호안 블록은 실험 조건에서 상하 ${\pm}3mm$ 정도로 미미하게 이동하였다. 그러므로 실험에 적용한 무독성 호안 블록은 고유속에서 대규모 이동, 블록 파괴, 침상 침하 등이 나타나지 않는 것으로 보아 충분한 안정성을 확보한 것으로 판단되었다.

• 자원리싸이클링
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• 제4권4호
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• pp.70-75
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• 1995

폐타이어를 처리하는데는 매립, 소각, 재활용법으로 구분되어 있다. 이중 재활용에 대한 관심이 고조됨에 따라 연구가 활발하게 진행되고 있다. 폐타이어 재활용법에는 원형이용, 열이용, 분말가공 이용법이 있고 본 연구에서는 이중 분말가공 방법에 의하여 고무보도블럭 제조에 대한 연구를 수행하였다. 고무보도블럭 제조공정은 폐타이어를 수집하여 분쇄공정에 의해 얻은 폐타이어 고무 분말을 접착제(binder)와 혼합하여 성형하는 방법이다. 본문에서는 binder 종류에 따라 물성의 변화를 비교하여 보았고, 표면 코팅, 2층 구조 고무보도블럭을 다루어 경제적인 고무보도블럭 제조에 대하여 논하였다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2021년도 봄 학술논문 발표대회
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• pp.74-75
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• 2021

In the recent 2017 annual average fine dust concentration (PM2.5) statistics released by the Organization for Economic Cooperation and Development (OECD), Korea has a high concentration of 25.14㎍/m3, which is about twice the average of 12.5㎍/m3 in OECD countries. Fine dust (PM2.5) is the main source of secondary pollutant production by the reaction of primary pollutants emitted from automobiles and thermal power plants, mainly composed of sulfates, nitrates, and organic carbon. The permeable block is an eco-friendly product that prevents rainwater from collecting on the surface of the road because it does not penetrate the groundwater properly, and is widely constructed on sidewalks or parking lots to recharge groundwater in case of rain. In addition, the pavement of the permeable block is a fundamental solution to reduce pollution by preventing rainwater from flowing into the stream, and it also has the advantage of easy replacement as well as low replacement costs. Therefore, this study was a basic experiment to produce permeable blocks mixed with TiO2 and diatomite to improve indoor air quality, and intended to analyze the flexural strength and compressive strength of permeable blocks mixed with TiO2.

• 자원환경지질
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• 제50권1호
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• pp.61-71
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• 2017

본 연구는 절리의 빈도 및 길이분포가 절리암반의 수리지질학적 특성에 미치는 영향을 평가하기 위하여 이차원 불연속절리망 (DFN; discrete fracture network) 유체유동 해석을 바탕으로 한 수치실험을 수행하였다. 두개의 절리군을 사용하여 절리의 빈도와 길이분포를 달리하며 추계론적으로 생성한 총 51개의 DFN 시스템에 대하여 $0^{\circ}$부터 매 $30^{\circ}$ 간격으로 총 12 방향으로 구현한 총 612개의 $20m{\times}20m$ DFN 블록에서 방향에 따른 블록수리전도도가 산정되었다. 또한, 각각의 DFN 시스템에서 이론적 블록수리전도도와 더불어 주 수리전도도텐서, 평균 블록수리전도도 등이 산정되었다. 절리군의 빈도의 증가 또는 길이의 평균 및 표준편차 증가에 따라 임의 방향으로의 블록수리전도도는 증가하며 DFN 시스템에 대한 등가연속체 취급 가능성이 높아지지만, 절리군 간의 빈도 차이가 커지면 블록수리전도도의 이방성 증대로 인하여 등가연속체 취급 가능성이 낮아질 수 있는 것으로 평가되었다. 두 절리군의 교차각이 작을수록 등가연속체 특성은 빈도 및 길이분포의 변화에 상대적으로 더욱 영향을 받는 것으로 평가되었다. 등가연속체로 취급하기 어려울 정도로 두 절리군의 교차각이 작아도 절리군의 빈도 또는 길이 분포가 증가하면 등가연속체 취급 가능성은 높아진다.

• Journal of Evidence-Based Herbal Medicine
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• 제1권2호
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• pp.17-26
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• 2008

Nowadays the flow of international trade is that there seems to appear economic block significantly because most countries contract FTAs, so our market condition is changing to a severe competitive situation. Korea which has 70% of foreign dependence of trade must get involved in regionalism, and also actively promote FTA more than any other countries. FTA on February in 2006, the pharmaceutical industry are anxious. The pharmaceutical industry in Korea has recently come to a crisis that it is hard to expect a growth due to structure of profit and a change for the worse of management. If Korea-U.S. FTA are contracted in this kind of situation, domestic pharmaceutical companies will be at stake. We can anticipate that FTA with the country that has a strong competitive power like U.S. affect negatively on pharmaceutical industry, because the industry doesn't have enough self-competitiveness. Considering this kind of surroundings, we need to present the policy to enhance competitiveness for damage limitation on pharmaceutical industry by Korea-U.S. FTA. Under this background, this research has groped for a direction to strengthen the competitiveness to develop pharmaceutical industry in quality. The competitive enhancement plan is presented which is divided into the government policy part, the R&D part, and the management part. Although Korea-U.S. FTA is analyzed to wither the pharmaceutical industry, it would be thought that it is a good chance to upgrade domestic pharmaceutical industry if we make the best use of it, and also to make in roads into foreign market.

• 자원환경지질
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• 제31권1호
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• pp.45-52
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• 1998

Paleomagnetic data have been obtained from the Lower Triassic Tonggo Formation which is exposed in Tanyang area comprising the Pyeongan Supergroup in eastern Korea. Mean characteristic direction of the Tonggo Formation is declination/inclination=$121.4^{\circ}/-26.4^{\circ}$ (k=52.7, ${\alpha}_{95}=7.2^{\circ}$, N=9 Sites) and paleopole at longitude/latitude=$30.7^{\circ}E/33.3^{\circ}N$ ($dp/dm=4.2^{\circ}/7.8^{\circ}$). The mean direction passes reversal test and fold test at 99% confidence level. Therefore, it is inferred to be a pre-folding component. The paleopole position of this study is close to the Triassic pole positions of the North China Block; it is far from those of the South China Block. Therefore, a first order correlation between the Korean Peninsula and North China at least since Lower Triassic times is identified in this study.