동해 울릉분지 남서주변부의 탄화수소 트랩 분석

이민우,강무희,윤영호,이보연,김경오,김진호,박명호,이금석,Lee, Minwoo,Kang, Moo-Hee,Yoon, Youngho,Yi, Bo-Yeon,Kim, Kyong-O,Kim, Jinho,Park, Myong-ho,Lee, Keumsuk 대한자원환경지질학회 2015 자원환경지질 Vol.48 No.4

동해 울릉분지 남서주변부는 탄화수소의 부존 가능성이 높은 대륙붕 환경으로 1990년대 말에 상업적 생산이 가능한 가스전이 발견된 바 있다. 가스전과 인접한 연구지역에서도 추가적인 가스개발을 위해 침식수로 내부의 조립질 퇴적체를 대상으로 시추가 수행되었지만 경제성이 부족한 것으로 판명되었다. 본 연구에서는 새로 취득된 탄성파 및 기존 시추 자료를 이용하여 울릉분지 남서주변부에 분포하는 침식수로 하부에 탄화수소 트랩 가능성이 있는 지질구조를 탐지하였다. 취득된 심부 탄성파 자료 및 시추자료 해석에 의하면 연구지역에 분포하는 퇴적층은 구조진화와 연계하여 열개동시성 퇴적층군(MS1), 후열개 퇴적층군(MS2), 횡압력 동시성 퇴적층군(MS3), 후횡압력 퇴적층군(MS4)으로 구분된다. 중기 마이오세 이전에 분지형성과 동시에 퇴적된 MS1은 주로 중-저진폭, 저주파수의 캐오틱 음향특성을 나타낸다. 중기 마이오세 동안 분지가 확장되며 다량의 퇴적물이 유입된 MS2는 중-저진폭의 음향특성과 함께 연속성이 양호하며 전진퇴적 양상을 나타낸다. MS3은 고진폭 및 중-고주파수의 연속성이 양호한 반사면을 나타내는데 이는 조립질 퇴적층으로 해석된다. 조립질 퇴적물이 우세한 MS3는 침식수로에 의해 광역적으로 삭박되었으며 침식수로 내부에는 MS4의 세립질 퇴적물이 충전되어 층서트랩을 형성한다. 따라서 연구지역의 트랩 구조는 MS3의 조립질 퇴적층이 저류층을 형성하며 MS4의 세립질 퇴적물로 충전된 침식수로가 덮개암으로 작용하는 층서 트랩으로 트랩 구조 내부에서는 탄화수소 부존을 지시하는 flat-spot 탄성파 이상대가 발달한다. A commercial gas field was found in the southwestern continental shelf of the Ulleung Basin, East Sea in the late 1990s. To develop additional gas field, an exploration well was drilled through the coarse infill of submarine canyon near the gas field, but it was uneconomic to develop hydrocarbons. Using newly acquired deep seismic reflection and previous well data, we have identified additional geological structure which has hydrocarbon potentials below submarine canyons in the southwestern margin of the basin. Based on the interpretation of the deep seismic reflection and well data, the sequences of the study area can be classified into the syn-rift megasequence(MS1), post-rift megasequence(MS2), syn-compressional megasequence(MS3), and post-compressional megasequence(MS4) in relation to the tectonic events. MS1, deposited simultaneously with the basin formation before the middle Miocene, is characterized by chaotic seismic facies with low- to moderate-amplitude and low frequency reflections. MS2 comprises laterally continuous, low- to moderate-amplitude reflections, showing progradational stacking patterns due to high rates of sediment supply during basin expansion in the middle Miocene. MS3 is mainly composed of continuous reflections with high amplitude and moderate- to high-frequency which are interpreted as coarse-grained sediments. The coarse-grained sediments of MS3 sequence is widely truncated by several submarine canyons which filled with fine-grained sediment of MS4 to form a stratigraphic trap of hydrocarbon. Therefore, the reservoir and seal of the hydrocarbon trap in the study area are coarse-grained sediment of MS3 and submarine canyon filled with fine-grained sediment of MS4, respectively. A flat-spot seismic anomaly, which may indicate the presence of hydrocarbon, is observed within the stratigraphic trap.

인공신경망을 활용한 접촉점화 추진제의 점화지연시간 계측 기법 개발

이민우(Minwoo Lee),박성현(Seonghyeon Park),이경환(Kyounghwan Lee),이예진(Yejin Lee),이종광(Jongkwang Lee) 한국항공우주학회 2021 한국항공우주학회 학술발표회 논문집 Vol.2021 No.11

가상 동기 발전기 모사 인버터 제어기의 감쇠계수에 따른 계통 안정도 분석

이민우(MinWoo Lee),백승묵(Seung-Mook Baek),이수형(Soo Hyoung Lee) 대한전기학회 2024 대한전기학회 학술대회 논문집 Vol.2024 No.7

XRD와 XRF를 이용한 무명이(無名異)의 구성 성분 연구

이민우 ( Minwoo Lee ),최고야 ( Goya Choi ),이영종 ( Young-jong Lee ) 대한본초학회 2018 大韓本草學會誌 Vol.33 No.6

Objectives: The aim of the study was to analyze the constituents of Pyrolusitum, which was used to eliminate static blood and inflammation, to establish the basis of clinical application. Methods: Qualitative analysis was performed by X-Ray Diffraction (XRD) using the sample as a powder, and the elemental content of granular sample was measured by X-Ray Fluorescence (XRF). 1 M hydrochloric acid and 5% sodium hydroxide aqueous solution were added to observe the changing shape, respectively. Results: Qualitative analysis by XRD revealed that the Pyrolusitum samples used in the study contained quarts and kaolinite. Quantitative analysis by XRF revealed that the manganese content in the samples used in the study was 6.16% on average, while iron was contained the highest amount of 22.99%. The minor constituents include 1.08% of titanium, 0.30% of barium, 0.18% of lead, 0.06% of zirconium, 0.05% of chromium, 0.04% of zinc, 0.03% of cadnium, 0.02% of nickel, 0.01% of arsenic, 0.01% of copper, 0.01% of rubidium, 0.01% of strontium, 0.00% of molybdenum, respectively. And cobalt, which is reported to be a constituent of Pyrolusitum, was not detected at all in the samples of the study. Pyrolusitum was dissolved in dark brown when it was put into 1 M hydrochlorid acid, and there was brown precipitate when sodium hydroxide solution was added to Pyrolusitum and stirred. Conclusions: It was found that manganese and iron were the major constituents of Pyrolusitum, and it could be identified by using concentrated hydrochloric acid and sodium hydroxide solution.

주파수 재사용을 고려한 HF 통신 전력-대역폭 상충관계 분석

이민우(Minwoo Lee),서현일(Hyounil Seo) 한국정보통신학회 2023 한국정보통신학회 종합학술대회 논문집 Vol.27 No.1

해군은 지휘통제체계 운용을 위해 초가시권과 가시권 무선통신망을 필요로 한다. 이를 위해 위성통신에 너무 의존하지 않기 위해 WBHF (Wideband High Frequency) 기술에 대한 관심이 증가하고 있다. 본 논문에서는 HF 통신에서 대역폭, 송신 출력, 전송속도의 최적화에 대한 고려사항을 분석한다. 또한, 주파수 재사용을 고려하여 전력-대역폭 상충관계 (tradeoff)에 대한 고찰을 제시한다. The Navy requires over-the-horizon and line-of-sight wireless communication networks for command and control operations. To this end, there is a growing interest in WBHF (Wideband High Frequency) technology to avoid excessive reliance on satellite communication. This paper analyzes the considerations for optimizing bandwidth, transmitter power, and transmission speed in HF communications. Additionally, it discusses the power-bandwidth tradeoff, considering frequency reuse techniques.

HybridFTW : 동적 타임 워핑 거리의 하이브리드 계산

이민우(Minwoo Lee),김상필(Sang-Pil Kim),문양세(Yang-Sae Moon),김진호(JinHo Kim) 한국정보과학회 2012 한국정보과학회 학술발표논문집 Vol.39 No.2C

다의 구분과 다의 유형에 대한 연구

이민우(Minwoo Lee),김진해(Jinhae Kim) 한국중원언어학회 2015 언어학연구 Vol.0 No.37

This study aimed to seek a system and a principle to understand “polysemy.” For this goal, two research questions of this study are established as follows: (1) How can various meanings of a word be divided? and (2) How can possible ways that one word has various meanings be categorized? In regard to the first question, we could conclude that there are no criteria to separate meanings explicitly; in other words, our attempts to separate polysemy have always failed. This is due to the probability that the meaning of a word can be ultimately decided by the context and the information on its “referent.” Therefore, in understanding a polysemic word, it is more reasonable to consider the context and the information on its referent. The second research question is relevant to rules such as metonymy and synecdoche. There is polysemy which is created by rules such as conceptual metaphors and metonymy. Meanwhile, it is possible to interpret meanings of a word in various ways by category, context, syntagmatic relation, and structure.

북한의 이동식 미사일 발사대 움직임 분석에 관한 연구

이민우(Minwoo Lee),이춘주(Choonjoo Lee) 육군사관학교 화랑대연구소 2018 한국군사학논집 Vol.74 No.3

North Korea keeps developing nuclear weapon as well as various types of missile launchers, such as Transporter Erector Launcher(TEL), submarine launcher, and solid-fueled missile launcher to evade detection during launch preparation. As a defensive response to North Korea’s nuclear and missile threats, South Korea is continue researching and developing its own Kill-Chain, Korean Air and Missile Defense(KAMD), and Korean Massive Punishment and Retaliation(KMPR). However, South Korea’s Kill-chain system has a limitation on North Korea’s mobile missile launchers if real-time target information is not provided. Therefore, this study propose TEL pattern analysis which models TEL movement to improve this limitation. This study will contribute on strike location tracking and efficient military operation by proposing model which provides estimation on TEL movement pattern and subsequential strike location tracking.

동해 울릉분지 남서주변부의 탄화수소 이동경로 분석

이민우(Minwoo Lee),강문희(Moo-Hee Kang),윤영호(Youngho Yoon),김경오(Kyong-O Kim),김진호(Jinho Kim),박명호(Myong-Ho Park) 대한지질학회 2014 대한지질학회 학술대회 Vol.2014 No.10

HybridFTW를 사용한 효율적인 k-NN 검색

이민우(Minwoo Lee),문양세(Yang-Sae Moon),김진호(Jinho Kim) 한국정보과학회 2013 정보과학회논문지 : 데이타베이스 Vol.40 No.6

시계열 데이터를 대상으로 한 유사 검색에서 동적 타임 워핑(dynamic time warping: DTW) 거리를 효율적으로 계산하기 위해 많은 연구가 수행되었다. DTW 거리는 유사 검색에서 높은 정확도를 제공하지만, 계산이 복잡하여 대용량 데이터베이스에 적용하기 힘든 문제점이 있다. 이러한 DTW 거리의 효율적 계산 방법으로 FastDTW와 FTW가 제안되었고, 최근 이 두 방법의 장점을 취한 HybridFTW가 제안되었다. HybridFTW는 FastDTW의 허용 범위 제한을 통한 빠른 계산의 장점과 FTW의 미리 버림의 장점을 조합한 하이브리드 접근법이다. 본 논문에서는 우선 FTW와 FastDTW의 장점을 각각 분석하고, 이들의 장점을 취한 HybridFTW의 개념을 설명한다. 그런 다음, HybridFTW를 k-NN 검색에 사용하기 위한 주요 절차를 다섯 단계로 나누어 설명한다. 그리고, 이들 다섯 단계를 사용하여 HybridFTW 기반의 k-NN알고리즘을 새롭게 제안하고, 그 정확성을 정리로서 제시하고 증명한다. 마지막으로, 실제 실험을 통해 제안한 알고리즘이 기존의 FastDTW와 FTW를 기반한 알고리즘보다 최대 20배까지 성능을 향상시킴을 보인다. There have been many research efforts on computing the DTW(dynamic time warping) distance efficiently in similarity search on time-series databases. The DTW distance is known to offer the high accuracy in similarity search, but it has a critical problem in supporting the large database due to its high computation complexity. For the fast computation of the DTW distance, FastDTW and FTW have been proposed recently, and HybridFTW has also been proposed to adopt both of their advantages. HybridFTW is a hybrid approach that combines the advantage of FastDTW, which provides the fast computation through the limitation of allowable ranges, and the advantage of FTW, which exploits the early abandon effect. In this paper, we first analyze the computation procedure of FastDTW and FTW in detail and present the concept of HybridFTW by taking both of their advantages. After then, we propose a HybridFTW-based k-NN algorithm. For this, we first explain five major steps to implement the HybridFTW-based k-NN search in detail. We next propose a formal k-NN algorithm exploiting HybridFTW and prove its correctness through a formal theorem. Experimental results for real and synthetic data sets show that the proposed k-NN algorithm improves the search performance by up to 20 times over k-NN algorithms based on FastDTW and FTW.