Jaemin Lee

이 연구는 국내에서 운용되고 있는 지하수 장기관측망의 자동 관측자료를 이용하여, 발생빈도가 상대적으로 높은 M3.0내외의 소규모 지진에 의한 영향과 지진 전조현상에 의한 지하수의 변화 관측 및 구분가능성을 평가하고자 수행되었다. 사용된 지하수 관측자료는 2012년 4월~6월 기간의 1시간 단위로 김천지좌, 강진성전, 공주정안 3개 관측소의 암반관측공에서 관측된 자료이다, 지하수위, 수온 및 EC 값의 시계열 자료에서 부분적으로 급격한 이상변동이 관측되었으며, 이변동은 2012년 5월 30일 경북 영덕에서 발생한 M3.1 지진의 전조와 그 영향으로 해석된다. 그럼에도 불구하고 지진의규모 및 발생위치와 관측공까지의 거리와 지하수 변동의 크기는 선형관계를 보이지 않으며, 이는 관측공 자체의 구조적특성과도 연관된다. 따라서 지진관측을 고유목적으로 하는 관측공의 설치, 운용이 필요하며, 이를 통한 장기적 모니터링은 지진 재난지역에서의 비상수자원 확보와 지하공간 안전성 확보의 기반정보를 제공할

As a preliminary survey to improve efficiency of well-based permeable reactive barrier system for groundwater remediation, this site-scale study was carried to identify the flowpaths and controlling factors of plume at a remediation site in Suwon City, Korea. A total of 22 monitoring wells were installed as a grid system in the 4 m × 4 m square area by 1-m interval. For the groundwater characterization, various tests were performed including water-level monitoring, water sampling & analysis, pum

The AmonRa instrument, the primary payload of the international EARTHSHINE mission, is designed for measurement of deep space albedo from L1 halo orbit. We report the optical design, tolerance analysis and the optical performance of the breadborad AmonRa imaging channel instrument optimized for the mission science requirements. In particular, an advanced wavefront feedback process control technique was used for the instrumentation process including part fabrication, system alignment and integrat

This study was conducted to test the field applicability of a well-type barrier system containing Slowly Released Molasses (SRM) as an extra carbon and energy source to promote the indigenous bacterial denitrification activity. A total of 22 wells were placed as a grid system in the 4 m × 4 m square by 1-m interval in one alluvial area. A total of 70 SRM rods were placed in the center of the grid system to consist of a field-scale SRM system. Nitrate-N plume (72 mg N L−1 of nitrate-N) was introd

The purpose of this study was to correlate between photoelectrochemcial hydrogen production rate and electron transfer with various types of metal doped TiO_2 nanotubes as photoanodes. In order to fabricate light sensitized photoanode, CdS, WO_3, and Pt were doped by electrodeposition method. As the results of experiments, the electron transfer was favorable from higher position to lower position of conduction band (CB). In consequence, the higher hydrogen production rate was as follows, CdS/TiO

Effects of climate change on groundwater system requires understanding the groundwater system in temporal and spatial scales through the long-term monitoring. In this study, the spatio-temporal variations of groundwater were analyzed through the continuous observation of water level, electrical conductivity (EC) and water temperature with automatic dataloggers and sampling in a Gwangneung catchment, Korea, for the four years from 2008 to 2011. Groundwater monitoring were performed at the nest-ty

Anodized tubular TiO_2 electrodes (ATTEs) with three noticeably different lengths are prepared to determine their optimum length for the photo-driven activity in the reaction of Cr(VI) reduction and hydrogen evolution. The ATTEs with ethylene glycol have longer TiO_2 tubes (7-15.6 μm) than those with hydrfluoric acid (0.6-0.8 μm). These samples, which differ only in the length of the tubes, with a wall thickness of ca. 20 nm, consist mainly of an anatase crystalline phase after heat treatment at

The international EARTHSHINE mission is to measure 1% anomaly of the Earth global albedo and total solar irradiance using Amon-Ra instrument around Lagrange point 1. We developed a new ray tracing based integrated end-to-end simulation tool that overcomes the shortcomings of the existing end-to-end performance simulation techniques. We then studied the in-orbit radiometric performance of the breadboard Amon-Ra visible channel optical system. The TSI variation and the Earth albedo anomaly, report

This study was objected to provide suggestions for best management practices to restore the cultural and historical values of the wells in Palaces as well as their water qualities. Water resources in the five Palaces in Seoul Metropolitan, including Gyeongbokgung, Changdeokgung, Changgyeonggung, Jongmyo Shrine, and Deoksugung, were surveyed for their physical flows and chemical compositions from April to July in 2010. Ground waters in most wells were found at depths within 5 m from the ground su

We describe the preparation of superparamagnetic nanoclusters (SNCs) by fine-tuning of the seed Fe3O4 nanoparticle sizes to enhance and their T2 relaxivity can be increased by > 4-fold. Therefore, with 11 nm seed core and PVA coating, SNC-11 exhibit a higher T2 relaxivity than other cluster condition. So fabricating the cluster, seed size is the most important influence the T2 relaxivity. As well as, in vitro cellular imaging results demonstrated the strong potential of SNCs for clinical applica

Hyperhomocysteinemia is an independent risk factor for cerebrovascular disease. Hyperhomocysteinemia can be caused by the defect of the remethylation pathway including the 5,10-methylenetetrahydrofolate reductase (MTHFR) gene or the transsulfuration pathway including the cystathionine ß-synthase (CBS) gene of homocysteine metabolism. The major cause of severe hyperhomocysteinemia is CBS gene mutation. A 16-year-old male was admitted with vertigo. Brain MRI showed right cerebellar infarction. The

Dens invaginatus is a developmental variation resulting from the infolding of the dental papilla before calcification of the dental tissue. Permanent maxillary lateral incisors are most commonly affected. The most widely used classification system for dens invaginatus was described by Oehlers. The purpose of this paper was to describe treatments of 2 cases on Type II dens invaginatus with open apex. In the first case, the invaginated barrier was removed, apexification and nonsurgical endodontic