• The Journal of the Petrological Society of Korea
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• v.14 no.1
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• pp.73-81
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• 2005

K-Ar ages have been determined for the submarine basalts dredged from the P2 and P3 segments of the Phoenix Ridge, Drake Passage, Antarctica, for better understanding on the extinction of seafloor spreading. At the P3 segment, the K-Ar ages of the rifted ridge basalts are 3.5-6.4 Ma, and those for the axial seamount basalts are 1.5-3.1 Ma. The K-Ar ages for the basalts at the rifted ridge and axial central high in the P2 segment are 2.1 and 1.4-1.9 Ma, respectively. We suggest that the extinction of seafloor spreading at the P3 and P2 segments occurred at 3.3 and 2.0 Ma, respectively, on the basis of ridge structure and formation time of basalts. This result favors a stepwise extinction model rather than a simultaneous one on the extinction of the Phoenix Ridge.

• Korean Journal of Mineralogy and Petrology
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• v.35 no.3
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• pp.235-258
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• 2022

We interpreted the evolutionary history of the southwestern part of the Pohang Basin, the largest Miocene basin in the southeastern part of the Korean Peninsula, based on the detailed geological mapping and analysis of the geological structures. The southwestern part of the Pohang Basin can be divided into the Bomun Domain in the west and Ocheon Domain in the east by an NNE-trending horst-in-graben. These two domains have different geometries and deformation histories. The Bomun Domain was rarely deformed after the incipient extension of the basin, whereas the Ocheon Domain is an area where continued and overlapped deformations occurred after the basin fill deposition. Therefore, the Bomun Domain provides critical information on the initial extension mode of the Pohang Basin. The subsidence of the Bomun Domain was led by the zigzag-shaped western border fault that consists of NNE-striking normal and NNW-striking dextral strike-slip fault segments. This border fault is connected to the Yeonil Tectonic Line (YTL), a regional dextral principal displacement zone and the westernmost limit of Miocene crustal deformation in SE Korea. Therefore, it is interpreted that the Pohang Basin was initially extended in WNW-ESE direction as a transtensional fault-termination basin resulting from the movement of NNE-striking normal and/or oblique-slip faults formed as right-stepover in the northern termination of the YTL activated since approximately 17-16.5 Ma. As a result, an NNE-trending asymmetric graben or half-graben exhibiting an westward deepening of basin depth was formed in the Bomun Domain. Afterward, crustal extension and deformation were migrated to the east, including the Ocheon Domain.

• KIPS Transactions on Software and Data Engineering
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• v.6 no.4
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• pp.185-192
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• 2017

In various fields of science, 2-dimensional array data is being generated actively as a result of measurements and simulations. Although various query processing techniques for array data are being studied, the problem of finding similar regions, whose sizes are not known in advance, in 2-dimensional array has not been addressed yet. Therefore, in this paper, we propose an efficient method for finding regions with similar element values, whose size is larger than a user-specified value, for a given 2-dimensional array data. The proposed method, for each pair of elements in the array, expands the corresponding two regions, whose initial size is 1, along the right and down direction in stages, keeping the shape of the two regions the same. If the difference between the elements values in the two regions becomes larger than a user-specified value, the proposed method stops the expansion. Consequently, the proposed method can find similar regions efficiently by accessing only those parts that are likely to be similar regions. Through theoretical analysis and various experiments, we show that the proposed method can find similar regions very efficiently.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2023.05a
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• pp.13-14
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• 2023

IALA에서는 관제구역의 원활한 정보 공유를 위해 IVEF 모델을 사용하고 있다. 우리나라는 선박교통관제 기본계획에 따라 연안구역을 모두 관제구역으로 확장할 예정이다. 이에 따라 원활한 정보 공유의 중요성은 높아지고 있다. 그러나 우리나라는 다양한 제조사의 VTS 시스템을 사용하고 있어 타제조사를 사용하는 관제구역간의 정보 교환은 원활하지 않다. 원활하지 않은 정보공유 시스템은 동일한 작업을 반복해야 하므로 관제사의 효율 및 집중도를 떨어뜨릴 수 있다. 이에 본 연구는 관제구역 간 원활한 정보 공유의 필요성 확보를 위해 AIS 데이터를 활용하여 관제구역 간 선박 이동량 및 연결성을 분석하고자 한다.

• Proceedings of the Korean Information Science Society Conference
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• 2000.04a
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• pp.630-632
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• 2000

경합은 공유메모리 병렬프로그램의 비결정적인 수행결과를 초래하므로, 디버깅을 위해서 경합탐지는 중요하다. 임계구역을 가진 병렬프로그램을 위한 수행중 경합 탐지 기법은 공유 자료구조를 사용하므로, 매 접근 사건 시에 병목현상을 유발한다. 본 연구에서는 동기화가 있는 병렬프로그램에서 매 반복을 수행할 때마다 공유 자료구조의 접근 횟수를 기껏해야 임계구역의 수에 비례하도록 매 접근사건을 검사한다. 그러므로 이 기법은 수행중 경합탐지의 확장성과 효율성을 제공한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.9
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• pp.298-303
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• 2018

This study discusses the conceptual definition of a balcony and the emergence of basic-type and expansion-type floor plans according to the balcony utilization. In addition, the change in building density is analyzed with regard to real cases, and base data are offered for future urban policies in Incheon Metropolitan City. The context of the Building Acts could be understood through the analysis of various balcony definitions and characteristics, and the analysis was divided into basic and extension types according to the legalization that occurred in 2005. The issue of density according to balcony expansion is discussed through theories, and a planned attempt at density management in the target area is investigated. The building area, floor area, and floor area ratio are discussed with regard to the target area, and the density management is empirically proven, which is different from the Unit Plan.

• Journal of the Korean Institute of Traditional Landscape Architecture
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• v.37 no.2
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• pp.54-65
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• 2019

China government recently tries to preserve not only the famous national historic-culture cities, but also the small and medium-sized cities due to the damages and destruction of the cities by the rapid economic development, urban expansion and the development of tourism industry. Hence, this study chose 'Zhoucun ancient mall' which is one of the hotness of cultural heritage located in a mid-sized city named 'Zhoucun district Zibo city Shandong province' that has continuously cared historical landscapes by the protective policy regarding the city as a historic-culture resource from '80s, and considered the character of the city's development process on how the historical landscapes were well protected. In fact, the protection policy in Zhoucun ancient mall had been started in early '80s, however, the viable plan was established in 2001 entitled 'Historical block protection planning of Zhoucun Da street'. And then, 'Regulatory plan for the ancient mall site of Zhoucun Da street' established in 2008 has expanded the area of the blocks for protection. However, this plan organized area only block-by-block so that the small blocks couldn't have the unity when expanded. Later in 2015, 'Regulation Organization Plan' hastried to expanded the protect-area to solve the unity problem. As a result of the study, the historical landscape management plan of Zhoucun in Zibo city has been systematically changed in 2001 after. In other words, this 2001's plans established buffer zones for the maintenance of protected areas and the surrounding environment. And then the detailed regulatory plan for 2008 led to a concrete urban management plan. After that, in 2015, it was found that the expansion plan to protect and manage the whole area of Zhoucun disrict is to manage the landscape of the surrounding area including the historical landscape of 'Zhoucun ancient mall'.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2017.05a
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• pp.417-419
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• 2017

In natural disasters and industrial accidents, by using unmanned exploratory robots to investigate the affected area, prevent damage to the second person and learn detailed information about the area.

• Proceedings of the Korea Water Resources Association Conference
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• 2018.05a
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• pp.470-470
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• 2018

본 연구는 2014년 부산지역에서 발생한 집중호우에 따른 피해상황을 읍 면 동 단위의 행정구역에 대해 조사하고, 각 행정구역별 수해복구사업의 우선순위를 결정 할 수 있는 방법을 모색하는 것을 목표로 한다. 피해현황은 인명피해(사망, 이재민 수), 건물 및 선박, 농경지 침수에 의한 피해, 공공시설물에 대한 피해를 조사하였다. 또한 피해 요인별 피해액을 집계하여 수해복구사업의 평가기준으로 이용하였다. 사업의 경제성은 B/C분석 결과를 통해 반영하였다. 각 행정구역에 대한 우선순위는 다기준분석 중 PROMETHEE, ELECTRE 방법으로 분석하였고 표준화 방식은 T-Score방식을, 가중치는 엔트로피 방식으로 결정하여 분석에 반영하였다. 본 연구에서는 실제 발생한 호우에 대한 피해복구사업에 적용하여 검증을 시도하였으나, 향후 치수사업의 다양한 대안을 선정하고 우선순위를 결정하여 실제 도시개발 및 정비 사업 등으로 분야를 확장할 수 있을 것으로 기대한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2023.11a
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• pp.940-942
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• 2023

교통사고 통계에 따르면 비보호 구역 내 도로에서 발생하는 교통사고 발생률이 일반 도로보다 30% 높은 수준임이 밝혀졌다. 기존 첨단 운전자 지원 시스템(ADAS: Advanced Driver Assistance Systems)은 다양한 사고 시나리오가 존재하는 비보호 구역에 적용하기에는 한계가 있다. 본 논문은 이러한 문제에 대응하기 위해 기존 ADAS 기능을 확장하여 예측과 판단이 어려운 비보호 구역에서 AI 분석을 통해 운전자에게 주행 가능 여부를 시각적으로 제공하는 시스템을 개발하고자 한다. 이 시스템은 운전자에게 경고와 지원을 제공함으로써 비보호 구역 내 교통사고를 예방할 수 있다.