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이한남 ( John Rhee ),곽동민 ( Dong-min Kwak ),박세원 ( Sewon Park ),엄진희 ( Jin-hee Um ) 한국정보처리학회 2015 한국정보처리학회 학술대회논문집 Vol.22 No.1
본 연구에서는 글의 구성요소를 추측하는 가장 높은 성능을 나타내는 알고리즘을 제시한다. 실험 방법은 글의 각 문장에 대한 자질을 추출, 자질 선택, 그리고 데이터에 대해 여러 기계학습 알고리즘을 학습시킨 후 성능을 비교하여 진행하였다. 또한 이 중 가장 높은 성능을 보이는 CRF 를 기존에 연구되어 있는 성능과도 비교하였다. 마지막으로 CRF 가 구성요소를 추측하는 데 있어서 가장 높은 성능을 보이는 이유에 대해 분석하였다. 국내의 유명 어학원 및 토플 웹사이트를 통해 1969 개의 토플 에세이를 수집했으며 2 명의 전문 평가자를 통해 각 문장을 8 개의 분류로 나누었다. 이를 CRF 를 적용한 결과 87.2%의 F score 가 나왔으며 기존 연구결과, 그리고 다른 알고리즘보다 높은 성능을 보였다.
Assessment of Great Vessels for Anterior Access of L5/S1 Using Patient Positioning
Choi John,Rhee Isaac,Ruparel Sameer 대한척추외과학회 2020 Asian Spine Journal Vol.14 No.4
Study Design: This was a prospective cross-sectional study.Purpose: The aim was to describe the effect of patient positioning, from supine to lateral decubitus position, on the width of the L5/S1 anterior disk space defined by the great vessels.Overview of Literature: The application of the lateral decubitus position interbody fusion has been rapidly increasing; however, there are concerns regarding the access to the lumbosacral region due to the great vessels, which necessitates further morphometric data.Methods: A total of 20 consecutive live patients awaiting lumbar surgery were subjected to two magnetic resonance imaging scans on the same day in both supine and lateral decubitus positions at a single center to investigate the anterior L5/S1 disk space.Results: The bare anterior L5/S1 disk window was present in all patients of this study population, and the mean width was 27 mm in the supine and 22 mm in the lateral decubitus position, with a mean reduction of 5.2 mm between the positions. The oblique corridor angle was measured at a mean of 33°.Conclusions: The bare window of L5/S1 disk space was present within this population group, and it was found to be mobile and changed significantly with patient positioning. Therefore, the spine surgeon or the access surgeon must consider the increased potential vascular risk during disk access in lateral decubitus anterior lumbar interbody spinal fusion surgery.
Dolan, John R,Yang, Eun Jin,Kang, Sung-Ho,Rhee, Tae Siek Springer Science and Business Media LLC 2016 The ISME journal Vol.10 No.9
<P>The latitudinal diversity gradient is a well-known biogeographic pattern. However, rarely considered is how a cline in species richness may be reflected in the characteristics of species assemblages. Fewer species may equal fewer distinct ecological types, or declines in redundancy (species functionally similar to one another) or fewer trace species, those occurring in very low concentrations. We focused on tintinnid ciliates of the microzooplankton in which the ciliate cell is housed inside a species-specific lorica or shell. The size of lorica oral aperture, the lorica oral diameter (LOD), is correlated with a preferred prey size and maximum growth rate. Consequently, species of a distinct LOD are distinct in key ecologic characteristics, whereas those of a similar LOD are functionally similar or redundant species. We sampled from East Sea/Sea of Japan to the High Arctic Sea. We determined abundance distributions of biological species and also ecological types by grouping species in LOD size-classes, sets of ecologically similar species. In lower latitudes there are more trace species, more size-classes and the dominant species are accompanied by many apparently ecologically similar species, presumably able to replace the dominant species, at least with regard to the size of prey exploited. Such redundancy appears to decline markedly with latitude in assemblages of tintinnid ciliates. Furthermore, the relatively small species pools of the northern high latitude assemblages suggest a low capacity to adapt to changing conditions.</P>