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Jeon, Sehyun,Hwang, Seok‐,Il,Son, Young Don,Kim, Young‐,Bo,Lee, Yu Jin,Kim, Seog Ju FOLIA PUBLISHING SOCIETY 2019 PSYCHIATRY AND CLINICAL NEUROSCIENCES Vol.73 No.6
<P><B>Aim</B></P><P>The aim of this study was to assess neuropsychological correlations with the T2* relaxation time (T2*‐RT) of hippocampal subregions in adolescents using ultra‐high‐field (UHF) 7.0‐T magnetic resonance imaging (MRI).</P><P><B>Methods</B></P><P>We assessed the T2*‐RT of hippocampal subregions in 31 healthy 11th‐ or 12th‐grade high school students using an UHF 7.0‐T MRI system. T2*‐RT of the cornu ammonis (CA) 1, CA2, CA3, and CA4 subregions and the subiculum were calculated for both the left and right hippocampus. Seven subtests of the Cambridge Neuropsychological Test Automated Battery were administered to the subjects to assess visuospatial memory.</P><P><B>Results</B></P><P>Poor performances in delayed recall in the pattern‐recognition test were significantly correlated with longer T2*‐RT in the bilateral subiculum (right, <I>r</I> = −0.480, <I>P</I> = 0.006; left, <I>r</I> = −0.648, <I>P</I> < 0.001) and the left CA2 (<I>r</I> = −0.480, <I>P</I> = 0.006).</P><P><B>Conclusion</B></P><P>This study showed that longer T2*‐RT in the subiculum were associated with poorer performances in delayed recall in the visual memory tasks. This finding suggests that the subiculum might play a predominant role in delayed recall in adolescents.</P>
최세현(Choi SeHyun),이상학(Lee SangHak),손찬수(Son ChanSoo) 한국농식품정책학회 2011 한국농식품정책학회 학술대회 논문집 Vol.2011 No.4
Record-keeping is one of the most fundamental practices in good farm management as it shows a systemic managerial and analytic data essential for a successful farm operation. Despite such obvious benefits in record-keeping, however, todays farmers do not take advantage of this practice for various reasons. Currently the government does provide farmers with a few samples of record-keeping books through agricultural development and technology center of cities and counties. However, these samples are too difficult for farmers to understand and utilize, or they are not practical enough to reflect the day-to-day reality of their individual farm operation. To make the matter worse, not much research has been done to resolve this incompatibility. Therefore, it is urgent for both the government and the farmers to come up with a better method or book of record-keeping that will show the farmers where their operation has been in the past, where it is now, and where it is heading in the future. This study will survey and analyze the current status of record-keeping practice among farmers and then it will suggest improvements in farm record-keeping. In particular, it will collect and analyze data from individual farmers about how they maintain their own farming records - to ultimately develop a model of an ideal farm record-keeping book, easy to use and understand and at the same time practical in their everyday use. Finally, this study will also suggest how to supply this revised record-keeping book to farmers.
B-spline Curve Fitting과 심플렉스법을 적용한 자동차 록업클러치 피스톤 형상최적설계에 관한 연구
김철(Choel Kim),현석정(Seokjeong Hyun),손종호(Jongho Son),신세현(Sehyun Shin) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
An efficient method is developed for the shape optimization of 2-D structures. The sequential linear<br/> programming is used for minimization problems. Selected set of master nodes are employed as design<br/> variables and assigned to move towards the normal direction. After adapting the nodes on the design<br/> boundary, the B-spline curves and mesh smoothing schemes are used to maintain the finite element in<br/> good quality. Finally, a numerical implementation of optimum design of an automobile torque converter<br/> piston subjected to pressure and centrifugal loads is presented. The results shows additional weight up<br/> to 13% may be saved after the shape optimization.