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RISS 인기검색어
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- 저자 : 오석민(Seokmin Oh) (검색결과 3 건)
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오석민 ( Seokmin Oh ),노규보 ( Kyubo Noh ),설순지 ( Soon Jee Seol ),변중무 ( Joongmoo Byun ) 한국지구물리·물리탐사학회 2017 지구물리와 물리탐사 Vol.20 No.4
Recently, steel casing became an interesting issue when applying controlled-source electromagnetic (EM) method to various fields because effects of steel casing on EM responses are not negligible. This study employed an approach that approximates the steel casing as a series of electric dipole sources in order to develop the numerical algorithm for the efficient simulation of EM responses in the presence of steel casing. After verifying the validity of the developed algorithm, we analyze effects of steel casing on EM responses with the synthetic model simulating geothermal reservoir environment. The analysis showed that the effects of steel casing on EM responses are localized near the casing and increase as the transmitter becomes close to the casing. In addition, through the analysis on the EM responses by the injection of clean water, we confirm that the effects of casing are negligible when interpreting the after-injection data acquired using the transmitter located far enough from the casing. Considering the difference in EM responses between before and after injection in inversion, the effects of the casing can be neglected although after-injection data shows considerable difference due to the close distance between the transmitter and casing. To investigate this kind steel casing effect, the precise analysis on EM responses should be preceded. The algorithm introduced in this study will contribute to the reliable calculations of EM responses distorted by the conductive steel casing.
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무인 항공 전자탐사 이론 연구: 임의 모양의 송신루프에 의한 전자기장 반응 계산 및 분석
방민규 ( Minkyu Bang ),오석민 ( Seokmin Oh ),설순지 ( Soon Jee Seol ),이기하 ( Ki Ha Lee ),조성준 ( Seong-jun Cho ) 한국지구물리·물리탐사학회 2018 지구물리와 물리탐사 Vol.21 No.3
Recently, unmanned aircraft EM (electromagnetic) survey based on ICT (Information and Communication Technology) has been widely utilized because of the efficiency in regional survey. We performed the theoretical study on the unmanned airship EM system developed by KIGAM (Korea Institute of Geoscience and Mineral resources) as part of the practical application of unmanned aircraft EM survey. Since this system has different configurations of transmitting and receiving loops compared to the conventional aircraft EM systems, a new technique is required for the appropriate interpretation of measured responses. Therefore, we proposed a method to calculate the EM field for the arbitrary shaped transmitter and verified its validity through the comparison with analytic solution for circular loop. In addition, to simulate the magnetic responses by three-dimensionally (3D) distributed anomalies, we have adapted our algorithm to 3D frequency-domain EM modeling algorithm based on the edge-FEM (finite element method). Though the analysis on magnetic field responses from a subsurface anomaly, it was found that the response decreases as the depth of the anomaly increases or the flight altitude increases. Also, it was confirmed that the response became smaller as the resistivity of the anomaly increases. However, a nonlinear trend of the out-of-phase component is shown depending on the depth of the anomaly and the used frequency, that makes it difficult to apply simple analysis based on the mapping of the magnitude of the responses and can cause the non-uniqueness problem in calculating the apparent resistivity. Thus, it is a prerequisite to analyze the appropriate frequency band and flight altitude considering the purpose of the survey and the site conditions when conducting a survey using the unmanned aircraft EM system.
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밀레니얼 세대의 멀티 디바이스 미디어 이용에 대한 조사 및 분석
이민규(Mingyu Lee),곽지영(Jiyoung Kwahk),한성호(Sung H. Han),정다운(Dawoon Jeong),박규동(Kyudong Park),김주환(Ju Hwan Kim),오석민(Seokmin Oh),채건호(Gunho Chae) 대한인간공학회 2017 大韓人間工學會誌 Vol.36 No.6
Objective: The aim of this study is to understand the multi-device media usage behaviors of the ’Millennial’ generation, focusing particularly on music, photo, and videos. Background: Millennials are generally defined as those who were born between early 1980’s and early 2000’s, and they are known to be familiar with various digital devices since childhood. Since they constitute more than 30% of the global population, they now became the most important target users for most companies. Therefore, identifying the characteristics of the millennials and reflecting them in product development is now essential to be successful in the market. Although many studies have been conducted to understand the characteristics of the millennials, they focus on the common characteristics of millennials as a whole. Method: In this study, an online survey was conducted with a total 360 millennial users. Participants responded to survey questions including the degree of interest in media and media devices, degree of media usage, types of media devices in use, goals and purposes of media usage, and the pain points of using media in a multidevice environment. Results: The results showed that the millennials were generally interested in new media devices or services and that they were willing to utilize a variety of functions to enrich their media life. Different from our expectations, however, not all of them were so active in investing money to purchase numerous media devices or services. In a multi-device environment, the millennials were consuming media using a variety of wireless devices, such as smartphones, digital camera, tablet PC, and Bluetooth speakers or headphones, but were having difficulty in using them. Conclusion & Application: This study investigated the media usage of the millennial users. The results of this study are expected to help designers to better understand the media-related characteristics of this emerging generation in more precision and to offer devices and services that millennials love.
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