Jin Wook Kim

Temperature, pressure, and time have been thought to control the smectite-to-illite (S-I) reaction, an important diagenetic process used for petroleum exploration. We demonstrated that microorganisms can promote the S-I reaction by dissolving smectite through reduction of structural Fe(III) at room temperature and 1 atmosphere within 14 days. This reaction typically requires conditions of 300 degrees to 350 degrees C, 100 megapascals, and 4 to 5 months in the absence of microbial activity. These

Effective removal or dissolution of large blood clots remains a challenge in clinical treatment of acute thrombo-occlusive diseases. Here we report the development of an intravascular microbubble-mediated sonothrombolysis device for improving thrombolytic rate and thus minimizing the required dose of thrombolytic drugs. We hypothesize that a sub-megahertz, forward-looking ultrasound transducer with an integrated microbubble injection tube is more advantageous for efficient thrombolysis by enhanc

본 연구의 목적은 여성의 경제참여 증가에 따른 무급가사노동의 분담정도를 설명하고 있는 세 가지 가설을 한국 상황에서 실증적으로 검증해 보는 것이다. 이 세 가지 가설이란 기혼여성이 취업할 경우 남성배우자가 적극적으로 가사노동을 분담한다는 협조적 적응 가설, 남성배우자의 가사노동분담이 이루어지지 않아 근로기혼여성은 유급과 무급의 이중적인 노동부담에 처하게 된다는 이중노동부담 가설, 그리고 어느 한 시점에서 근로기혼여성의 이중노동부담이 나타나는 것은 사실이나 그 정도는 세대간에 달라질 수 있으며, 장기적인 추세를 관찰하면 맞벌이 남성의 가사노동분담도 역시 증가해 왔다는 적응지체가설이다. 이상의 세 가설을 검증하기 위한 핵심 독립변수로 성별, 연령, 맞벌이 여부가, 종속변수로는 총 노동시간과 무급가사노동시간이 설정되었고, 분석자료는 1999년 통계청의 생활시간조사 원자료가 이용되었다. 연구결과, 근로기혼여성은 남성배우자에 비하여 하루 평균 100분 이상을 더 일하고 있었으며, 한국 남성들

The occurrence of microbially induced smectite-to-illite (S-I) reaction has challenged both the notions of solely inorganic chemical control for this reaction and the conventional concept of a semiquantitative illite geothermometer for the reconstruction of the thermal and tectonic histories of sedimentary basins. Here, we present evidence for a naturally occurring microbially induced S-I transition, via biotic reduction of phyllosilicate structural Fe(III), in mudstones buried at the Nankai Tro

소득이전 제도는 공적이전과 사적이전과 같은 이전소득 체계뿐만 아니라, 직접세와 사회보장기여로 구성되는 이전지출을 포함한다. 이 연구는 이러한 소득이전 제도의 효과성을 소득불평등 및 빈곤의 감소라는 측면에서 분석하고, 이에 근거하여 소득재분배 정책의 개선방향을 제시하는 것을 목적으로 한다. 이를 위해 본 연구는 전국 가구를 대표할 수 있는 유일한 자료원인 통계청의 2000년 가구소비실태조사를 이용하여, 소득분위분배율, 지니계수, 빈곤율, 빈곤갭을 측정, 소득불평등 및 빈곤감소 효과성의 주요 지표로 분석하였다. 분석결과, 한국의 소득이전 제도는 전반적인 소득불평등 수준 및 빈곤의 규모를 감소시키는 효과가 있는 것으로 나타났지만, 이러한 효과는 대부분 이전소득의 재분배 효과에 기인하는 것이며, 또 이전소득 중에서는 사적이전이 공적이전의 효과성을 압도하는 것으로 분석되었다. 한편, 이전지출의 경우 소득불평등 감소 효과성은 미미하였으나, 빈곤 규모의 변화에는 상당한 영향을 미치는 것으로 분석

This manuscript provides a review of candle-soot nanoparticle (CSNP) composite laser ultrasound transmitters (LUT), and compares and contrasts this technology to other carboncomposite designs. Among many carbon-based composite LUTs, a CSNP composite has shown its advantages of maximum energy conversion and fabrication simplicity for developing highly efficient ultrasound transmitters. This review focuses on the advantages and challenges of the CSNP-composite transmitter in the aspects of nanostr

Cavitation is an important phenomenon in biomedical acoustics. It can produce both desired outcomes (i.e., local therapeutic effects in vivo) and undesired outcomes (i.e., tissue damage), and it is, thus, important to both understand and direct cavitation fields. Through the use of three-dimensional-printed acoustic lenses and cavitation-sensitive acoustic phantoms, we demonstrate the generation of arbitrary shape two-dimensional (2D) microbubble cavitation fields. In this study, we demonstrate

Abstract Microstructural changes induced by the microbial reduction of Fe(III) in nontronite by Shewanella oneidensis were studied using environmental cell (EC)-transmission electron microscopy (TEM), conventional TEM, and X-ray powder diffraction (XRD). Direct observations of clays by EC-TEM in their hydrated state allowed for the first time an accurate and unambiguous TEM measurement of basal layer spacings and the contraction of layer spacing caused by microbial effects, most likely those of

A laser-generated-focused ultrasound (LGFU) transducer generates high-pressure (up to 20 MPa), high-frequency (>10 MHz) shock waves with a tight focal spot. In this work, we aim to demonstrate the feasibility of using LGFU transducers for sonothrombolysis in vitro. A carbon black LGFU transducer was designed, fabricated and characterized. The prototyped LGFU was applied with in-vitro thrombolysis tests involving microbubble contrast agent (MCA). A conventional piezo ultrasound transducer was use

Abstract Recent recession of the Larsen Ice Shelf C has revealed microbial alterations of illite in marine sediments, a process typically thought to occur during low-grade metamorphism. In situ breakdown of illite provides a previously-unobserved pathway for the release of dissolved Fe 2+ to porewaters, thus enhancing clay-rich Antarctic sub-ice shelf sediments as an important source of Fe to Fe-limited surface Southern Ocean waters during ice shelf retreat after the Last Glacial Maximum. When s

OBJECTIVE: It is technically difficult to treat wide-necked intracranial aneurysms by the endovascular method. Various tools and techniques have been introduced to overcome the related technical limitations. The purpose of this study was to evaluate the radiologic and clinical results of wide-necked intracranial aneurysm treatment using the endovascular method. METHODS: Fifteen aneurysms in 15 patients were treated by the endovascular method from October 2009 to August 2010. Seven patients prese