• Bulletin of the Korean Chemical Society
• /
• 제21권1호
• /
• pp.39-43
• /
• 2000

New coordination polymers of general form, $$[CoL_2X_2]_n$$ (L = 3,3'-oxybis(pyridine) (obp), 1,4-bis(3-pyri-doxy) benzene (bpob); X = Cl, NCS), have been prepared via a slow diffusion method. The reaction of the present linkers with cobalt(II) ion affords infinite 2-dimensional sheet products. For $[Co(obp) $_2Cl_2]_n$$, the local geometry of the cobalt center is an octahedral arrangement with four nitrogen donors and two chlorine ions in trans positions. $$[Co(bpob)_2(NCS)_2]_n$$ has provided a similar structure: the local geometry of the cobalt atom is an octahedral arrangement with four pyridine units and two NCS groups in transpositions. The obp and bpob linkers connect two cobalt(II) ions defining the edges of 40- and 60-membered $[Co(II)]_4$ ring, respectively. Thermal analyses of the coordination polymers show significant thermal behavior associated with the characteristic structures.

• Journal of Advanced Marine Engineering and Technology
• /
• 제33권1호
• /
• pp.44-51
• /
• 2009

The Characteristics of the flowfield through tube banks with in-line and staggered arrangements were investigated by PIV. Strouhal numbers, velocity vectors and velocity profiles around the cylinders with in-line and staggered arrangements were observed at the pitch ratio Pt/D=2.0 and Reynolds number of Re=$Re=4.0{\times}10^3$. As the results The flow patterns through tube banks were almost a straight line in case of the in-line arrangement while it was almost 八 type in case of the staggered arrangement in the direction of the wake. The average velocity in the rear region of the tube banks with the staggered arrangement was far smaller than that with the in-line arrangement. The Strouhal number in the last rank was far smaller than that in the front ranks in both of the in-line and staggered arrangements. The wake of each cylinder changed with time and with the position of the cylinder.

• 복식문화연구
• /
• 제22권5호
• /
• pp.776-793
• /
• 2014

This study attempted to figure out the usage of the modular system in other fields through literature review and empirical study, analyze its structural method in fashion. After analyzing architecture & product-related books, the Internet data and previous studies, the modular system's five structural methods were obtained. Then, 991 photos of women's clothes from 2003 to 2014 were collected through the fashion websites in Korea and abroad. The results can be summarized as follows: First, the following five structures were derived: assembling structure, overlapping structure, arrangement structure, inserting structure and folding structure. Second, according to analysis on the structural method of the modular system in modern fashion, overlapping structure (34%) was the most common. Third, in fashion, the use of fastener for installation and removal is important for assembling structure. In terms of overlapping structure, 3D volume by vertical accumulation was commonly observed. Arrangement structure revealed a horizontal and flat shape through simple arrangement. In inserting structure, on the contrary, non-standardized modules were used as a part of clothes or decorative elements. In folding structure, origami technique for reduction and expansion was used.

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2008년도 추계학술대회B
• /
• pp.2530-2535
• /
• 2008

The Visualizations of the flowfield through tube banks with in-line and staggered arrangements were investigated by PIV. Strouhal numbers, velocity vectors and velocity profiles around the cylinders with in-line and staggered arrangements were observed at the pitch ratio $P_t/D=2.0$ and Reynolds number of $Re=4.0{\times}10^3$. As the results The flow patterns through tube banks were almost a straight line in case of the in-line arrangement while it was almost 八 type in case of the staggered arrangement in the direction of the wake. The average velocity in the rear region of the tube banks with the staggered arrangement was far smaller than that with the in-line arrangement. The Strouhal number in the last rank was far smaller than that in the front ranks in both of the in-line and staggered arrangements. The wake of each cylinder changed with time and with the position of the cylinder.

• 한국고분자학회:학술대회논문집
• /
• 한국고분자학회 2006년도 IUPAC International Symposium on Advanced Polymers for Emerging Technologies
• /
• pp.173-173
• /
• 2006

We have explored a strategy to control the supramolecular nano-structures self-assembled from rigid segments through attachment of flexible chains through microphase separation and anisotropic arrangement. Supramolecular structures formed by self-assembly of rigid building blocks can be precisely controlled from 1-D layered, 3-D bicontinuous cubic to 2-D cylindrical structures by systematic variation of the type and relative length of the respective blocks. Furthermore, depending on the individual molecular architectures, rigid building blocks self-assemble into a wide range of supramolecular structures such as honeycomb, disk, cylinder, helix, tube, barrel stave, and nano-cage.

• 한국수자원학회논문집
• /
• 제49권1호
• /
• pp.51-60
• /
• 2016

본 연구에서는 투과성 잠제의 형상 및 평면배치에 따른 방류 흐름제어 기능을 분석하기 위하여 유체 투과성 구조물 해저지반의 비선형 상호간섭을 직접해석 할 수 있는 PBM (Porous Body Model) 기반의 3차원 수치파동수조(NWT; numerical water tank) LES-WASS-3D를 이용하였다. 먼저 이용하는 LES-WASS-3D의 타당성 및 유효성을 확보하기 위하여 투과성 구조물를 통과하는 댐 붕괴파의 전파특성에 관한 수리모형실험과 계산결과를 비교 분석하였다. 투과성 잠제를 고려한 방류시뮬레이션으로부터 투과성 잠제의 적절한 형상 및 평면배치는 방류유속을 저감하고 흐름을 유도하는 데 상당히 효과적인 것을 알 수 있었다. 또한 투과성 잠제의 형상 및 평면배치에 따른 흐름제어에 대한 적용성은 평균류분포, 연직유속분포를 통하여 확인할 수 있었다.

• 한국콘텐츠학회논문지
• /
• 제12권2호
• /
• pp.78-85
• /
• 2012

본 논문은 3D 컴퓨터 게임 개발에 있어서 필수적인 3D 지형 툴 개발을 위한 효율적인 알고리즘을 제안한다. 특히 본 논문은 Picking 속도를 향상시키기 위한 교차검출 기법에 대하여 제안한다. 즉, 본 논문에서는 기존의 광선과 삼각형으로 구성된 교차검출 기법보다 광선과 평행사변형으로 구성된 효율적인 교차검출 기법을 제안함으로서 보다 빠른 Picking 속도를 확인할 수 있었다. 본 논문에서 제안하는 기법이 기존의 기법과 비교하여 더 빠른 Picking 속도를 내고 있다는 것을 확인하기 위해서는 DirectX SDK의 샘플들 중 Picking 예제를 실험에 사용하였다. 또한 기존의 기법과 본 논문에서 제안하는 기법으로 교차검출을 위한 함수 호출 횟수를 비교해본 결과 본 논문에서 제안하는 기법이 기존의 기법보다 약 50% 줄어든 것을 확인할 수 있었다. 그리고 이를 시간적으로 계산해 보았을 때에는 기존의 기법보다 1~2초 정도 단축되었음을 확인할 수 있었다. 추가적으로 본 논문에서는 3D 지형 툴로서 갖추어야할 기능들 중 텍스처 스플래팅, 지형의 높낮이 조절, 객체 배치 및 사실적인 물 효과 등의 기능들을 보다 개선된 알고리즘으로 제공함으로서 실제 3D 컴퓨터 게임 개발에 효율적으로 사용가능하도록 하였다.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
• /
• 제49권3호
• /
• pp.138-144
• /
• 2000

The detent force caused by the interaction of magnets with the teeth of a armature core deteriorates the driving performance of a permanent magnet linear synchronous motor. In this paper, we analyze the fields and forces of a linear synchronous motor with segmented or skewed magnet arrangement according to lateral overhang length of permanent magnets. For the analysis, the 3-dimensional equivalent magnetic circuit network method is used. The detent force and the static thrust are analyzed according to the segmented or skewed angle and the overhang length of permanent magnets, and the optimal angles that the detent force is minimized are found out in each case. The analysis results are compared with the experimental ones and shown a reasonable agreement.

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2001년도 춘계학술대회논문집E
• /
• pp.555-559
• /
• 2001

A new stereoscopic PIV is developed using two CCD cameras, stereoscopic photogrammetry, and a 3D-PTV principle. The wake of a circular cylinder is measured by the developed stereoscopic PIV technique. The B mode vortical structure of the wake over the Reynolds number 300 is clearly seen by the developed technique. The arrangement of the two cameras is based on angular position. The calibration of cameras and the pair-matching of the three-dimensional velocity vectors are based on 3D-PTV technique.

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2002년도 학술대회지
• /
• pp.471-474
• /
• 2002

A new stereoscopic PIV has been constructed using two CCD cameras, stereoscopic photogrammetry, and 3D-PTV principle. The capability of the developed stereoscopic PIV was verified through a test on the Standard Images which are provided on the website of VSJ. The arrangement of the two cameras was based on angular position For the acquisition of 3D velocity vectors, 2D velocity vectors were obtained using the gray-level cross-correlation method from the two camera images and they were matched stereoscopically. The wake of a circular cylinder was measured and turbulent properties were presented.