• 한국진공학회지
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• 제21권2호
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• pp.69-77
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• 2012

전자기장을 포함한 대부분의 물리학적 시스템이 벡터 미분 연산자들로 기술되며 또한 벡터연산을 통하여 계산된다. 그러므로 이들 벡터장들이 유전 및 자성물질 시스템들과 상호작용할 때 물리적 체계를 기술하고 계산하려면 정확한 전자기 벡터장의 지식체계를 이해할 필요가 있다. 그런데 이들 대부분 추상적 개념들을 직관적으로 이해하기에는 쉽지 않기 때문에 이들 추상적 개념의 시각화 표현 작업은 오늘날 지식정보화 수행과정에서 매우 중요한 과제의 하나다. 우리는 전자기학 체계를 구성하는 가장 기본적인 벡터장: $\vec{E}=-\vec{\nabla}_{\varphi}$, $\vec{D}={\epsilon}\vec{E}$, $\vec{\nabla}{\times}\vec{A}$, $\vec{B}={\mu}\vec{H}$, $\vec{B}={\mu}_0(\vec{\nabla}_{\varphi}{^*}+\vec{M})$들의 가시화 시뮬레이션을 Mathematica 프로그램으로 작성하여 추상적인 전자기벡터장의 시각화 모델을 제시하였다. 이 시뮬레이션을 전자기 벡터장의 물리학적 지식체계를 탐구해 가는 기본 플랫폼으로 활용할 수 있다.

• Progress in Superconductivity
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• 제6권2호
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• pp.129-132
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• 2005

The formation behavior of $YBa_2Cu_3O_{7-x}$(Y123) and CuO phases in the heat-treated Cu-sheathed YBCO thick films was studied. The thick films were prepared by screen-printing method using $BaCO_3$ and Y211 powders on Cu tapes. The screen-printed thick films were placed at the center of the tube furnace, heated to $930^{\circ}C$ in air atmosphere and then maintained at the temperature for 60 sec - 300 sec. The microstructure and phases formed in the thick films were investigated by using optical microscope, X-ray diffraction (XRD) and SEM image analysis. During the heat treatment, partial melting occurred rapidly in the printed layers by peritectic reaction between CuO and precursor powders, and then YBCO superconducting phases nucleated from the Cu tapes and grew in a form of thick films.

• 인문언어
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• 제1권2호
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• pp.179-196
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• 2001

According to Formalist theory, form is not separate from content. Form does not merely convey or express content but can itself produce meaning. The close correlation of the narrative structure, more specifically the time structure of the narrative, and the narrative style of Kim Seung-Ok′s short story′"Travel in Mujin" provides a good example of this argument. The story opens with the first-person narrator, currently living in the bustling city of Seoul, back in his small provincial home town Mujin, where he brings up memories that had been hitherto suppressed. The revived memories are ordered into the narrator′s present thought structure, in effect bridging the vast psychological rift between the lost past and the present. The narrator′s travel in Mujin thus becomes a psychological journey, and Mujin becomes a psychological space where the narrator can experience the continuity of his own being. The "narrating I" excludes the principles of reality from his narrative, concentrating on the inner thoughts, recollections, psychological experience, and the level of consciousness of the "narrated I." This narrative attitude or style expresses the narrator-protagonist′s acceptance and affirmation of the thoughts and actions occur in Mujin (which he had till now been resistant to). It is also an affirmation of the narrative act itself. Before the travel back to Mujin, the narrator-protagonist′s thoughts about his home town was ambivalent-an attitude originating from nostalgia, together with the narrator-protagonist′s ambivalent attitude toward his youthful past. It is a reflection of the narrator-protagonist′s desire for purity intermingled with a disdain for his enervated existence in Seoul. This ambivalence is resolved by the "I" of the narrative present, and Mujin enables him to come to a renewed affirmation of his life.

• 한국운동역학회지
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• 제15권3호
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• pp.105-115
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• 2005

This study was investigated the kinematic factors of the last approach strides and. take off motion for the skill improving of BKH elite male athlete. 'The subjects chosen for the study were BKH and. KASZCZYK Emillian male athletes who were participated in 2003 Dae-Gu Universiad Games. Three high speed video cameras set in 60frames/s setting were used. for recording from the last approach strides to the apex position. After digitizing motion, the Direct Linear Transformation(DLT) technique was employed to obtain 3-D position coordinates, The kinematic factors of the distance, velocity and angle variable were calculated for Kwon3D 3.1. The following conclusions were drawn; 1. It showed longer stride length, as well as faster horizontal and lateral velocity than the success trial during the approach phase. For consistent of the approach rhythm, it appeared that the subject should a short length for obtain the breaking force by the lower COG during the approach phase. 2. The body lean angle showed a small angle by a high COG during the take-off phase. For obtain the vertical displacement of the COG and a enough space form the bar after take-off, it appeared that the subject should increase the body lean angle. 3. For obtain the vertical force during the takeoff phase, it appeared that the subject should keep straight as possible the knee joint. Therefor, the subject can be obtain a enough breaking force at the approach landing.

• 한국운동역학회지
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• 제12권1호
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• pp.15-30
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• 2002

The purpose of this study was analyzed the effect of kinematical and kinetical factors of lower extremity of form change in the cause of growth an unborn child during in pregnancy. Three pregnant women were selected from pregnant 24 weeks as subjects. Each subjects were required to walk with usual walking speed. Cinematographic and GRF data were collected during walking, and the kinematical and kinetical variables were calculated using Kwon3d. Based on the results of the study, the following conclusions were drawn : 1. Step width and Step length The change of form during the period of pregnancy was not statistically found significant in the step width and the step length. 2. Angle of lower extremity 1) The change of form during the period of pregnancy was not statistically found significant in the hip angle at right heel contact, mid stance, but it was statistically found significant in the hip angle at toe off on p<.05. 2) The change of form during the period of pregnancy was not statistically found significant in the knee angle at right heel contact, mid stance, but it was statistically found significant in the knee angle at toe off on p<.05. 3) The change of form during the period of pregnancy was not statistically found significant in the ankle angle at right heel contact, mid stance, but it was statistically found significant in the ankle angle at toe off on p<.05. 3. Ground reaction force 1) The change of form during the period of pregnancy was statistically found significant in medial-lateral force(Fx) on p<.001. 2) The change of form during the period of pregnancy was not statistically found significant in post-anterior force(Fy). 3) The change of form during the period of pregnancy was statistically found significant in impulse force and minimum peak of vertical reaction force on p<.001, p<.01 but it was not statistically found significant in second maximum force.

• 한국운동역학회지
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• 제12권2호
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• pp.33-49
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• 2002

본 연구는 골프스윙 시 체형별로 나타나는 운동학적 요인을 분석하여 비교함으로써 체형별 골프지도를 위한 기초자료를 제공하는데 있다. 이를 위해 현재 남자 프로골프선수 9명을 대상으로 각자의 체중과 신장 그리고 상완둘레등을 고려하여 외배엽, 내배엽, 중배엽으로 체형을 나누었다. 각자의 골프스윙동작을 비디오 카메라로 촬영하여 스윙동작을 8개의 구간으로 나누어 분석하였으며 다음과 같이 결론에 도달하였다. 골프스윙 소요시간은 내배엽형이 가장 길었으며 다음으로 중배엽형, 마지막으로 외배엽형이 가장 짧은 스윙시간을 보이고 있었다. 좌우이동변위가 가장 크게 나타나는 체형은 중배엽형이었으며, 다음으로는 내배엽형, 그리고 외배엽형이 가장 작게 움직이는 것으로 나타났다. 내배엽형은 임팩트 시 상하변위가 상승쪽으로 향하고 있었으며 내배엽형과 중배엽형은 임팩트 시 거의 일정한 높이를 유지하여 안정감을 높이는 것으로 나타났다. 상체회전각도와 골반회전각도는 임팩트 시 외배엽형의 상체와 골반이 미리 돌아가는 형태를 취하고 있어 내배엽과 중배엽형에 비해 다소 다른 특징을 보이고 있었다. 이러한 스윙에 대한 체형별 운동학적 특징을 이론을 제시함에 있어 보다 근본적인 힘의 이동을 알아야 할 필요가 있다. 따라서, 차후 연구에서는 지면반력을 이용하여 압력중심점(COP)의 분석이 함께 이루어져야 할 것으로 판단된다.

• 한국결정성장학회지
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• 제13권3호
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• pp.122-126
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• 2003

본 연구에서는 두께가 0.7 $\mu \textrm{m}$인 $Zn_{0.86}Mn_{0.14}$Te 에피막을 GaAs(100) 기판 위에 열벽 적층 성장하였다. 선택에칭용액에 의하여 GaAs 기판이 제거된 X-선 회절 패턴으로부터 $Zn_{0.86}Mn_{0.14}$Te에피막의 결정구조는 zincblende 이었으며 격자상수는 6.140 $\AA$으로 계산되었다. 이러한 격자상수 값과 Vegard 법칙으로부터 Mn의 조성비 x=0.14임을 알았다. 성장된 에피막의 결정성은 이중결정요동 곡선의 반폭치 값이 256 arcsec인 것으로부터 양호하다는 것이 확인되었다 상온에서 10K 까지 $Zn_{0.86}Mn_{0.14}$Te에피막의 온도에 따른 띠 간격 에너지를 측정하기 위하여 투과 스펙트럼으로부터 흡수 스펙트럼이 얻어졌다 온도가 감소할수록 흡수 스펙트럼에서 강하게 흡수가 일어나는 영역은 에너지가 큰 쪽을 향하여 이동하였고 흡쑤단 근처에서 자유 엑시톤 형성을 의미하는 흡수 피크가 생겨났다. $Zn_{0.86}Mn_{0.14}$Te에피막의 온도에 따른 자유 엑시톤 피크 에너지로부터 OK와 300 K일 때 띠 간격 에너지는 각각 2.4947 eV와 2.330 eV로 구하여졌다. 10 K에서 기판이 제거된 $Zn_{0.86}Mn_{0.14}$Te 에피막의 흡수 스펙트럼의 자유 엑시톤 피크 에너지는 광발광 피크 에너지보다 15.4 meV 정도 크다. 이 에너지 차이는 흡수 스펙트럼과 발광 피크 사이의 에너지 차이를 의미하는 Stokes shift를 나타낸다.