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Application of laser-induced breakdown spectroscopy to Arctic sediments in the Chukchi Sea
Han, Dukki,Joe, Young Jin,Ryu, Jong-Sik,Unno, Tatsuya,Kim, Gibaek,Yamamoto, Masanobu,Park, Kihong,Hur, Hor-Gil,Lee, Ji-Hoon,Nam, Seung-Il Elsevier 2018 Spectrochimica acta. Part B, Atomic spectroscopy Vol.146 No.-
<P><B>Abstract</B></P> <P>Physical and geochemical investigations coupled with laser-induced breakdown spectroscopy (LIBS) were performed on three surface sediment cores (ARA02B/01A, ARA02B/02, and ARA02B/03A) recovered from the western Arctic Ocean (Chukchi Sea) during the IBRV ARAON 2011 expedition. The LIBS technique was applied to conduct elemental analysis of the Arctic sediments and compare the results to those obtained using an X-ray fluorescence (XRF) core scanner and inductively coupled plasma (ICP) system. The LIBS technique showed an elemental composition similar to that using XRF and ICP in each sediment core. Qualitative and semi-quantitative LIBS analyses provide distinguishable patterns between sediment cores, similar to those observed in the ICP analysis. In particular, the elemental pattern of LIBS responded to the color change of the sediment cores. Dark brown layers in the upper parts of the cores were indicated by the color indices and showed elevated Mn/Al ratios, suggesting the influence of regional variation in terrestrial input since the deglacial period. In this study, grain size distribution and contents of detrital dolomite and organic carbon as well as elemental composition (LIBS) were considered to determine sediment provenance and sedimentation environments during the Holocene. Furthermore, the present study showed that the LIBS technique may be used as an applicable method to unravel regional variations in sedimentary composition in the Arctic Ocean.</P> <P><B>Highlights</B></P> <P> <UL> <LI> LIBS may be an alternative method for the Arctic sediment with reasonable accuracy. </LI> <LI> Mn/Al and Fe/Al are responsive to the sediment provenance in the Chukchi Sea. </LI> <LI> Grain size and mineral influence LIBS spectra in the Arctic sediments. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
이경호(Kyungho Lee),윤덕기(Dukki Yoon),김경수(Kyungsu Kim),박우찬(Woo Chan Park) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
In this paper, we proposed internal SRAM storage scheme with data compression for depth. We compressed depth data using DDPCM lossless coding. The experiment result shows that our system achieve high hit rate of 94.4% depth data. The compression ratio for depth data is 3.48 times better than original data. It also showed that it decrease 95% of demanding external memory bandwidth.
알코올 의존자의 Mindfulness와 정신 증상, 알코올 사용, 성격 차원의 상관관계
정재웅(JaeWoong Jeong),이덕기(DukKi Lee),이성근(SeongKeun Lee),조현기(HyunKi Cho),서재원(JaeWon Suh) 한국중독정신의학회 2012 중독정신의학 Vol.16 No.2
Objective : The purpose of this study is to measure mindful-ness in alcohol- dependent patients and examine its correlation with psychiatric symptoms, alcohol use. and personality traits. Method : We enrolled 180 alcohol-dependent patients (164males, 16 females) by the Diagnostic and Statistical Manual of Mental Disorders-IV (DSM-IV) criteria. This study was a cross-sectional design, and used the Five Facet Mindfulness Questionnaire (FFMQ), Symptom Checklist-90-Revision (SCL-90-R), Alcohol Use Inventory (AUI). And a Korean version of the Eysenck Personality Questionnaire (K-EPQ) as the self-re-ported questionnaires. The scores of these questionnaires were evaluated with Pearson Correlation Analysis in order to com-pare the relationship of mindfulness and psychiatric symptoms, alcohol use. and personality traits. Results : 1) The FFMQ sum score had a negative correlation with the SCL-90-R symptom scale. In particular, ‘somatization’, obsessive-compulsive’, ‘in-terpersonal sensitivity’, ‘depression’, ‘anxiety’, ‘hostility’, and ‘psychoticism’ were strong negative correlation with the FFMQ sum score. 2) The FFMQ sum score had a negative correlation with the 2nd-level scale and 3rd-level scale of AUI (except for ‘ENHANCED’ of the 2nd-level scale). In particular, ‘DISRUPT2’, ‘ANXCONCN’, and ‘ANCINVOL’ were strong negative correlations with the FFMQ sum score. 3) The FFMQ sum score had a strong negative correlation with ‘psychotisim’, ‘neuroticism’, ‘ad-diction’, and ‘criminality’ of K-EPQ, whereas ‘extraversion-intra-version’ and, ‘lie’ of K-EPQ had strong positive correlation with the FFMQ sum score. Conclusion : In this study, mindfulness had a significant correlation with psychiatric symptoms, alcohol use, and personalitytrait. The investigation effect of the mindfulness program for alcohol dependent patients should be a priority.
Di, Doris Y. W.,Lee, Anna,Jang, Jeonghwan,Han, Dukki,Hur, Hor-Gil American Society for Microbiology 2017 Applied and environmental microbiology Vol.83 No.3
<P>IMPORTANCE The presence of enteropathogenic Vibrio species (Vibrio cholerae, Vibrio parahaemolyticus, and Vibrio vulnificus), which cause acute diarrheal infection, septicemia, and wound infections upon ingestion through food and water, is usually associated with temperature. The World Health Organization (WHO) has estimated that there are 1.4 to 4.3 million cases and 28,000 to 142,000 deaths per year worldwide caused by cholera disease. In South Korea alone, consumption is as much as 52.4 kg of fish and shellfish per year per capita. Our findings suggested that seasonally specific acceleration of these possible pathogenic Vibrio spp. may threaten seafood safety and increase the risk of illness in South Korea, where local people consume raw fish during warmer months.</P>
Unno, Tatsuya,Han, Dukki,Jang, Jeonghwan,Lee, Sun-Nim,Ko, GwangPyo,Choi, Ha Young,Kim, Joon Ha,Sadowsky, Michael J.,Hur, Hor-Gil American Society for Microbiology 2009 Applied and environmental microbiology Vol.75 No.17
<B>ABSTRACT</B><P>Multiplex PCR analyses of DNAs from genotypically unique <I>Escherichia coli</I> strains isolated from the feces of 138 humans and 376 domesticated animals from Jeonnam Province, South Korea, performed using primers specific for the <I>chuA</I> and <I>yjaA</I> genes and an unknown DNA fragment, TSPE4.C2, indicated that none of the strains belonged to <I>E. coli</I> phylogenetic group B2. In contrast, phylogenetic group B2 strains were detected in about 17% (8 of 48) of isolates from feces of 24 wild geese and in 3% (3 of 96) of isolates obtained from the Yeongsan River in Jeonnam Province, South Korea. The distribution of <I>E. coli</I> strains in phylogenetic groups A, B1, and D varied depending on the host examined, and there was no apparent seasonal variation in the distribution of strains in phylogenetic groups among the Yeongsan River isolates. The distribution of four virulence genes (<I>eaeA</I>, <I>hlyA</I>, <I>stx</I>1, and <I>stx</I>2) in isolates was also examined by using multiplex PCR. Virulence genes were detected in about 5% (38 of 707) of the total group of unique strains examined, with 24, 13, 13, and 9 strains containing <I>hlyA</I>, <I>eaeA</I>, <I>stx</I>2, and <I>stx</I>1, respectively. The virulence genes were most frequently present in phylogenetic group B1 strains isolated from beef cattle. Taken together, results of these studies indicate that <I>E. coli</I> strains in phylogenetic group B2 were rarely found in humans and domesticated animals in Jeonnam Province, South Korea, and that the majority of strains containing virulence genes belonged to phylogenetic group B1 and were isolated from beef cattle. Results of this study also suggest that the relationship between the presence and types of virulence genes and phylogenetic groupings may differ among geographically distinct <I>E. coli</I> populations.</P>