• Journal of the Institute of Electronics and Information Engineers
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• v.50 no.11
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• pp.195-205
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• 2013

The analysis of electroencephalographic signal associated with the attention is essential for the understanding of human cognition. In this paper, the characteristic differences between the attention and inattention status in the brain were inspected by nonlinear analysis. The recurrence quantification analysis was applied to the relatively small number of samples of evoked potential having time varying characteristics, where the recurrence plot (RP), the color recurrence plot (CRP), and mean and time-sequential trend parameters were extracted. The dimension and the time delay in phase transformation can be determined by the paired set of extracted parameters. It is observed from RP, CRP, and parameters that the brain dynamics in attention is more complex than that in the inattention, as well as the synchronized brain response is stable in the mean sense but locally time varying. It is feasible that the non-linear analysis method can be useful for the analysis of complex brain dynamics associated during visual attentional task.

• Nuclear industry
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• v.14 no.8 s.138
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• pp.45-51
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• 1994

중국은 원자력법에 의해 원자력관리 주무관청(에너지성 및 그 관할하의 중국핵공업총공사), 안전감독기관(국가핵안전국) 및 기타 원자력안전$\cdot$감독 주무관청(국가환경보호국, 위생성, 공안성, 노동인사성) 등 3부문으로 나누어지는 행정조직을 갖고 있다. 이들은 $\ulcorner$집중관리, 분업협력$\lrcorner$이라는 원칙을 근거로 각 관청이 각각 독립적으로 권한을 행사한다.

• The Monthly Diabetes
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• s.126
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• pp.56-57
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• 2000

뇌호흡은 무엇보다 상상을 통한 수련법이다. 그러니 상상력을 마음껏 발휘해 보자. 초보자의 경우 한번에 20분내지, 30분 정도 집중한다. 그러나 숙달이 되면 5분에서 10분 정도로도 충분하다. 뇌호흡을 하면 깊은 명상 상태에 빠지게 되는데, 그때 몸에서 일어나는 변화를 차분히 관찰해 보자. 아침, 저녁으로 하루 두차례 하면 좋다.

• Journal of the Society of Naval Architects of Korea
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• v.38 no.4
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• pp.39-47
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• 2001

In this paper, the hydroelastic behavior of a mat-type large floating structure is analyzed in time domain by using mode superposition method. The time-memory function is estimated by Fourier transforming the wave damping coefficients, which are computed by a higher-order boundary element method based on potential theory. Meanwhile, the structural response is obtained by time integrating the eigenmodes of the structure. Numerical examples are made for three test cases on the scaled model of a mat-type large floating structure ; weight pull-up case, weight drop case and weight moving case. In all three cases, the numerical results coincide well with experimental data.

• Geotechnical Engineering
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• v.14 no.1
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• pp.93-108
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• 1998

In this study, the analytic solutions and numerical methods were used to estimate the shape and size effects on the stability of underground openings. The stability of underground openings was evaluated by scrutinizing the effects of the rock mass quality, the state of in-situ stresses and the lateral earth pressure coefficient on the displacement, the stress concentration and the plastic region developed in the vicinity of the openings. The analytic solutions have shown that the stress concentration factor is inversely proportional to the radius of curvature of openings. Through parametric study on the various shapes and sizes of underground openings the characteristics of the controlling factors concerned with the stability were analyzed. Then, the study was extended to the horseshoe-shaped openings commonly used for under ground storage. Through the extended study the effects of the stress ratio and the height-towidth ratio of openings on the maximum displacement and plastic region developed around the openings were estimated. The results have shorn that the height-to-width ratio of domestic storage caverns can be increased economically without stability problem, as far as the lateral earth pressure coefficient is appropriate.

• Journal of Music and Human Behavior
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• v.3 no.2
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• pp.1-14
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• 2006

The purpose of this study is to examine the effect of violin learning as to enhance the attention span and impulsiveness of children with Attention Deficit Hyperactivity Disorder(ADHD). Three children with ADHD, grade 2, 3, 4 were selected to participate in the research. A total of 15 session were given during 8 week time span, including a final performance session. For measurement, Korean-Child Behavior Checklist(K-CBCL), Home Situation Questionnaire-Revised (HSQ-R), Conners Teacher Rating Scale-Revised (CTRS-R) were administered before and after the implementation. Other behavioral checklist were used to record inappropriate or interruptive behaviors. The results showed that violin learning has increased attention span and reduced impulsive behaviors of all three children with ADHD. Along with these changes, the identified inappropriate behaviors reduced as sessions progressed. Also the changes observed within the music environment were generalized to non-music environment, such as family and school. These results also indicate that violin can be a therapeutic medium used in music therapy setting to bring positive changes for children with ADHD problems.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2016.05a
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• pp.159-160
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• 2016

본 연구는 우리나라 수출입 컨테이너화물의 5대 내륙기종점 권역별로 항만집중도 및 변이효과를 분석함으로써, 항만간 경쟁 구도 및 효율적인 컨테이너부두 개발 및 운영에 대한 시사점을 도출하고자 한다. 2011년, 2006년, 2011년의 항만별 내륙기종점 조사자료를 바탕으로 허쉬만-허펜달지수 및 변이할당법을 활용하여 분석하였다.

• The Mathematical Education
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• v.38 no.1
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• pp.49-59
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• 1999

This article is to advance the connection between students' achievements and meditation and to explore the direct relationship between two factors by performing meditation in class, which has not been researched. As a result of study, I am convinced that meditation has a positive relation with achievements and many further experiments and researches (This article suggested many kinds of meditation.) will surely confirm this fact.

• Journal of the Society of Naval Architects of Korea
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• v.39 no.1
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• pp.38-48
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• 2002

Theoretical development to generate the directional extreme waves in model basin is established based on wave focusing method. The effects of associated parameters, such as the directional range, frequency width, and center frequency, are investigated in terms of wave focusing efficiency. The two different spectral models of constant wave amplitude and constant wave slope are applied to control the wave characteristics. The wave packets simulated by theory are compared with numerical results based on Boussinesq equation and FEM. Both controls of direction and frequency spectrum are essential to focus directional waves effectively. It is noticed that wave focusing ability depends on the frequency bandwidth of spectrum rather than center frequency, and both spectral models with same parameters result in the equivalent efficiency of wave focusing.

• Journal of Power System Engineering
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• v.8 no.3
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• pp.23-29
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• 2004

In this paper, a finite element formulation using dynamic-explicit time integration scheme is used for numerical analysis of Hydro-forming processes. The lumping scheme is employed for the diagonal mass matrix and dynamic explicit formulation. Hydro-forming process for auto-body panel forming is analyzed by using dynamic-explicit finite element method. Further, the simulated results of the Hydro-forming processes are shown and discussed. Its application is being increased especially in the automotive industrial area for the cost reduction, weight saving, and improvement of strength.