• Journal of Korean Port Research
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• v.10 no.1
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• pp.37-51
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• 1996

2차의 섭동법과 경계요소법에 기초한 시간영역해석법은 불규칙파의 파동장에 있어서 파-구조물의 비선형간섭을 해석할 수 있는 해석법이지만. 파와 구조물의 운동이 정상상태에 도달하기까지 시간스텝으로 계산을 수행하여야 하므로 계산시간이 매우 길어지고, 각 성분파와 그에 의한 운동요소를 평가하는 것이 어렵다. 반면에 주파수영역해석법은 계산시간이 짧고, 각 성분요소들의 변화특성을 쉽게 판단할 수 있지만, 불규칙파동장으로의 적용이 현실적으로 어렵다는 단점을 가진다. 본 연구에서는 잠제 등에 대해서 전개되어 있는 주파수영역해석법을 임의형상의 부체 구조물에 대해 새롭게 수식의 전개를 수행하고, 압축공기주입 부체구조물에 적용하여 실험 및 이론해석결과로부터 그의 타당성을 확인한다. 이 때 압축공기의 거동은 Boyle법칙을 사용하여 평가한다.

• Bulletin of the Society of Naval Architects of Korea
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• v.26 no.2
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• pp.25-31
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• 1989

Two-dimensional large-amplitude motions in regular harmonic wave are treated in time domain, by satisfying the exact body boundary condition and the linear free surface condition. For the present numerical calculation, the method of free-surface spectral representation with simple source distribution on the instantaneous body surface has been extended to include the effect of the incident wave. Calculations of the wave exciting force are performed for a submerged circular cylinder fixed or oscillating with large amplitude. Especially, nonlinear effects on the time-mean forces are studied in detail. It is shown that relative motion between the body and the fluid particle gives a significant effect on the lift and drift forces. Also, large-amplitude motion of a submerged circular cylinder and that of a floating Lewis-form cylinder are directly simulated in time domain. In the calculation results, some nonlinear effects are shown.

• Proceedings of the Korea Information Processing Society Conference
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• 2010.11a
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• pp.728-731
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• 2010

현대 사회에서 운동 부족의 원인은 바로 빠른 삶을 추구하는 우리나라 사람들의 성향에 있다고 볼 수 있다. 이런 현대사회에서 빠른 삶을 추구할수록 사람들은 단기간에 많은 효과를 보려고 무리한 운동을 한다. 갑작스러운 운동은 우리 몸에 이로운 것이 아니라 스트레스를 쌓이게 하고 이렇게 쌓인 스트레스는 고혈압, 심근경색, 뇌졸중 등 심혈관계 질환에 영향을 미치는 중요한 위험요인이다. 혈압은 정서적 긴장이나 주위 환경 및 활동에 따라서 변동하기 때문에 갑작스런 운동은 혈압에 좋지 않은 영향을 줄 수 있다. 이에 본 논문에서는 갑작스런 운동량에 따른 혈압 변화와 얼굴색과의 상관성을 알아보기 위해 운동량에 따른 혈압 변화와 얼굴 영역 추출 후 얼굴영역에 나타나는 색상 변화를 Lab 값 중 a값의 변화를 비교, 분석하였다.

• Korean Journal of Cognitive Science
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• v.25 no.3
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• pp.259-276
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• 2014

Artists such as Duchamp and Balla tried to portray moving objects on static canvases by superimposing snapshots of moving objects. Previously, our group showed the influence of prior experience on brain responses within a motion-sensitive area MT+ to abstr act paintings with or without implied motion. In the present study, we went further to investigate whether the differential MT+activation between observers is originated from differential eye movement patterns. Prior experience was defined operationally with major in art. In addition, we examined whether perceiver's awareness of artist's intention concerning the implied motion, as well as expertise in art, affects the way he/she views the artwork. Results showed that the number and the duration of fixation on the abstract paintings tended to differ between participants based on art major. The awareness of artist's intention was not related to such differences. In contrast, observers' awareness of artist's intention of implying motion affected eye movement patterns in specific regions of the abstract paintings where the motion was portrayed. In other words, observers with awareness focused more on the parts of paintings portraying motion and moved their eyes in the direction corresponding to the direction of moving objects than observers without awareness. Expertise was not related to such specific eye movement patterns. The present study implies that art expertise and awareness of artist's intention play differential roles in observers' perception of paintings with implied motion. Namely, it suggests that expertise is related to the overall perception of paintings, while awareness of implied motion is related to perception of the specific spatial information in those paintings.

• Proceedings of the Korea Multimedia Society Conference
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• 2004.05a
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• pp.251-254
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• 2004

환자의 체동은 MRl에 의해 제공된 화질을 저하시키는 주된 원인이 되고 있다. 본 연구에서는 MRI에 있어서 3차원 강체운동에 기인한 아티팩트를 수정하는 기법을 제안한다. 이러한 목표를 달성하기위해 MR 화상 데이터를 얻기위한 2차원 다-슬라이스 기법(a multiple 2-D slice technique)이 사용되어왔다. 대상물체의 운동에 해당하는 수집된 MRI 데이터는 불균일 표본화와 위상오차에 의해 영향을 받게된다. 3차원 운동에 대해 주어진 운동 파라메타와 장면간의 영향이라는 가정하에 양선형보간법과 중첩법으로 다-슬라이스 데이터를 사용하는 방법에 기반한 재구성 알고리즘을 MRI 아티팩트를 수정하는데 사용한다. 미지의 체동 파라메타들을 추정하기위해 3차원 강체운동은 다-슬라이스 취득기법의 각 영상과 결합된 관심영역 바깥쪽에서의 측정된 에너지를 증가시킨다는 사실을 이용하는 최소에너지법을 적용한다.

• Proceedings of the Korea Water Resources Association Conference
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• 2018.05a
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• pp.271-271
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• 2018

그래픽 처리 장치(GPU: Graphic Processing Units)는 그래픽 처리에 특화된 수많은 산술논리연산자 (ALU: Arithmetic Logic Unit)와 이에 관련된 인스트럭션Instruction)으로 인해 중앙 처리 장치(CPU: Central Processing Units) 보다 훨씬 빠른 계산 처리를 수행할 수 있다. 최근에는 FORTRAN에 의해 구현된 많은 수치모형들이 현실적인 모델링 방법의 발달로 인해 더 많은 계산량과 계산시간을 필요로 한다. 이 연구에서는 GPU 상의 범용 계산GPGPU : General-Purpose computing on Graphics Processing Units) 기반 운동파 강우유출모형(Kinematic Wave Rainfall-Runoff Model)이 CUDA(Compute Unified Device Architecture) FORTRAN을 사용하여 구현되었다. CUDA FORTRAN 운동파 강우유출모형의 계산 결과는 검증된 CPU 기반 운동파 강우유출모형의 계산 결과와 비교하여 검증되었으며, 잘 일치함을 보여 주었다. CUDA FORTRAN 운동파 강우유출모형은 CPU 기반 모형에 비해 약 20 배 더 빠른 계산 시간을 보였다. 또한 계산 영역이 커짐에 따라 CPU 버전에 비해 CUDA FORTRAN 버전의 계산 효율이 향상되었다.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.34 no.4
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• pp.447-456
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• 2010

The application of a reliable motion simulator can contribute effectively in the evaluation of the performance of a vehicle platform in the development stage of a small unmanned aerial vehicle (UAV). Therefore, the research on a reliable motion simulator can accelerate the development of UAV and decrease the relevant cost. In this paper, the design factors considered in the preliminary design stage of a 6 degree-of freedom motion simulator are defined and the motion range of the simulator is described on the basis of these design factors. The length, acceleration, and the required thrust of actuators with respect to the motion simulator under development are also predicted. The motion range can be increased and a suitable actuator can be selected and produced by applying these results in the manufacturing process of the motion simulator. Thus, the reliability of the motion simulators can be achieved during the actual design operation of the UAV.

• The Journal of Korean Academy of Sensory Integration
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• v.16 no.2
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• pp.15-25
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• 2018

Objective : The purpose of this study was to examine the differences between motor functions and executive functions according to the timing of children with attention deficit hyperactivity disorder (ADHD). Methods : The subjects were 32 children with ADHD aged between 6 and 12 living Busan. To assess the timing, Long Form Assessment (LFA) of Interactive Metronome (IM) was used. Bruininks-Oseretsky of Motor Proficiency, Second Edition (BOT-2) were also used to assess motor functions. STROOP Color and Word Test and Children's Color Trails Test were used to evaluate executive functions. Mann-Whitney U tests were used to determine the differences between the executive functions and the motor functions according to the timing. Results : Comparing the inter-group motor functions according to the timing, there was a statistically significant difference in the Fine manual control and Fine motor precision in BOT-2 (p<.05). Comparing the inter-group executive functions according to the timing, there was not statistically significant difference (p>.05). Conclusion : Among the deficits in ADHD children, we could see the differences between motor function and executive function according to timing function. This study would be meaningful in that the results could be a basic data for study on the timing of children of ADHD in the future.

• 한국노년학
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• v.25 no.2
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• pp.95-108
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• 2005

This study was done to explore the level of physiologic health status and health promotion lifestyle, and its contributing factors of Korean older adults. A total of 209 older adults participated in this study that ran from July 2 to July 6, 2004 in the waiting area of the subways of Seoul. The average age of the respondents was 67 years old with 39.2% considering themselves as healthy, 71.3% stating they regularly exercised and 71.8% knowing their own blood pressure. Among the participants 44% were classified as having high or low blood pressure and 44.5% showing abnormal blood sugar. The mean score of health promotion lifestyle was 2.75 and the order of its subcategories was interpersonal relationship, nutrition, stress management, spiritual growth, physical activities, and health responsibilities. This score was altered by exercise and knowing personal blood pressure. As a result of this study, it is important for older adults to know their own blood pressure and to exercise regularly to promote good health. In addition, health promotion programs should be developed and implemented based on the influencing factors.

• Journal of Gifted/Talented Education
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• v.15 no.1
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• pp.1-10
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• 2005

Overexcitaility (OE) as a concept that is related to developmental potential, has been shown to differ by intelligence, gender, involvement in school programs and artistic interest in American populations of students. Overexitability, used to describe the five ways that people might experience developmental potential for emotional growth, are emotional, intellectual, imaginational, sensual, and psychomotor. Little is known about the profiles of groups of gifted learners outside of studies conducted in the United States. In order to better understand the emotional needs of Korean students, the purpose of this study was to determine the overexcitability profiles of students enrolled in four high schools, each with a different domain focus: math and sciences, visual and performing arts, and foreign languages. 341 subjects of this study completed the Overexcitability Questionnaire II. Multivariate Analysis of Variance (MANOVA) was conducted to determine statistical differences. The results showed that Mean scores of psychomotor, sensual and imaginational are highest in the Art High School, intellectual is highest in the Science High School and emotional is highest in the Foreign Language High School. There were significant differences among the schools. Each major also showed significant difference. The results showed that mean score of psychomotor is highest in the Dance major, sensual, imaginational and emotional are highest in the Drama majore and intellectual is highest in the Science major. The results showed that the mean scores of psychomotor, imaginational and intellectual are higher in the male students than female students. On the other hand the mean scores of sensual and emotional are higher in the female students than in the male students.