• 소성∙가공
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• 제33권2호
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• pp.123-131
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• 2024

Plastic, the main material of FFF-type 3D printing, exhibits lower strength compared to metal. research aimed at increasing strength is needed for use in various industrial fields. This study analyzed three X-shape infill patterns(grid, lines, zigzag) with similar internal lattice structure. Moreover, tensile test considering weight and printing time was conducted based on the infill line multiplier and infill overlap percentage. The three X-shape infill patterns(grid, lines, zigzag) showed differences in nozzle paths, material usage and printing time. When infill line multiplier increased, there was a proportional increase in tensile strength/weight and tensile strength/printing time. In terms of infill overlap percentage, the grid pattern at 50% and the zigzag and lines patterns at 75% demonstrated the most efficient performance.

• International Journal of Naval Architecture and Ocean Engineering
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• 제9권6호
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• pp.677-692
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• 2017

A numerical approach based on a potential flow method is developed to simulate the unsteady interaction between propeller and rudder. In this approach, a panel method is used to solve the flow around the rudder and a vortex lattice method is used to solve the flow around the propeller, respectively. An iterative procedure is adopted to solve the interaction between propeller and rudder. The effects of one component on the other are evaluated by using induced velocities due to the other component at every time step. A fully unsteady wake alignment algorithm is implemented into the vortex lattice method to simulate the unsteady propeller flow. The Rosenhead-Moore core model is employed during the wake alignment procedure to avoid the singularities and instability. The Lamb-Oseen vortex model is adopted in the present method to decay the vortex strength around the rudder and to eliminate unrealistically high induced velocity. The present methods are applied to predict the performance of a cavitating horn-type rudder in the presence of a 6-bladed propeller. The predicted cavity patterns compare well with those observed from the experiments.

• 충청수학회지
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• 제26권1호
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• pp.53-69
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• 2013

Topology may described a pattern of existence of elements of a given set X. The family ${\tau}(X)$ of all topologies given on a set X form a complete lattice. We will give some topologies on this lattice ${\tau}(X)$ using a topology on X and regard ${\tau}(X)$ a topological space. A topology ${\tau}$ on X can be regarded a map from X to ${\tau}(X)$ naturally. Such a map will be called topology field. Similarly we can also define pe-topology field. If X is a topological flow group with acting group T, then naturally we can get a another topological flow ${\tau}(X)$ with same acting group T. If the topological flow X is minimal, we can prove ${\tau}(X)$ is also minimal. The disjoint unions of the topological spaces can describe some topological systems (topological organisms). Here we will give a definition of topological organism. Our purpose of this study is to describe some properties concerning patterns of relationship between topology fields and topological organisms.

• 설비공학논문집
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• 제23권2호
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• pp.103-110
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• 2011

A two-dimensional immiscible droplet deformation phenomena on moving wall in a channel has been investigated by using lattice Boltzmann method involving two-phase model. The dependence of the deformation of the droplet with different sizes on the contact angle and the velocity of bottom wall has studied. When the bottom wall starts to move, the deformation of the droplet occurs. For the largest bottom wall velocity, eventually, the deformation of the droplet is classified into the three patterns according to the contact angle.

• 한국가구학회지
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• 제28권2호
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• pp.126-134
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• 2017

This study explores PyeongSang, a piece of traditional Korean furniture, in order to make people know the details about what the piece is in the first paper. And based on the paper, PyeongSang will be developed as moulded multi-useful beds and sofas adapting the joint and ornament from the structure and pattern of the piece in the next paper. As the result, it appeared as two styles such as bed types mentioned as SalPyeongSang and ttulmaru in Korean. The pieces have been used from the three Kingdoms period in Korean history. The styles appeared as the structure of four parts with the lower fences called as nangan, the seats jointed by thin wood pieces, the wind hole, and the legs of foot types. The parts were beautifully carved with the ornament such as lattice patterns like geokjamun and manjamun, flower patterns like dangchomun, elephant eyes patterns like ansangmun from the Korean tradition. And the legs showed various shapes such as supports transformed from horse foots, tiger legs and bamboo, and board types carved with elephant eyes and geometric patterns. Hence, in the next paper based on this paper, PyeongSang will be developed as moulded multi-useful beds and sofas adapting the joints and ornaments from the structure and patterns of the piece.

• Applied Microscopy
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• 제28권3호
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• pp.415-424
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• 1998

[ $Pb(Mg_{1/3}Nb_{2/3})O_3$ ] (PMN) 고용체의 고분해능 격자 이미지에 있어서 장거리 규칙도의 의존성을 컴퓨터 이미지 시뮬레이션을 이용하여 연구하였다. 컴퓨터 이미지 시뮬레이션은 multislice 방법으로 시편 두께, 초점 거리, 장거리 규칙도를 변화시켜 실시하였다. PMN에 있어서, 규칙격자 구조를 가지는 격자 이미지는 장거리 규칙도에 주로 의존하는 것을 발견하였다. 완전한 규칙격자 구조를 가지는 이미지는 유사 육방정 형태를 보였다 장거리 규칙도가 감소함에 따라, 유사 육방정 형태로부터 직사각형 형태로 변화되었고, 완전한 불규칙격자 구조를 가지는 이미지는 직사각형 형태를 보였다. 또한, 한 주어진 장거리 규칙도에서 시뮬레이션으로 얻은 이미지는 B-위치 양이온의 함량에 관계없이 거의 동일하였다.

• 건축역사연구
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• 제10권1호
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• pp.9-23
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• 2001

This study is for the Kyungduk-Dan(as a altar of Milsung-Daegun) and The Manun-Jae the characteristics(lay out and planning, window patterns, structure, materials) of the the Korean traditional house during the modern era. Before Manun-Jae was used for the house. The Kyungduck-Dan was constructed in August according to the Lunar Calender in 1927. The Manun-Jae(house for Ki-hun Kang, millionaire ) was completed in 1924. Modern Architectures brought to Korea with the bricks, the tiles, the flash doors, the plate grasses, the brass hardwares. These architectural material was used in positive. During the construction of Manun-Jae in 1924, it happened the architectural exchage among a korean, a chinese and a japanese constructor. Though using the air exhaust valve at the kitchen of Ukyung-Kak( old Anchae), it could be assume that the modern convenience and the improvement of residential environments was considered at that period during the construction of Manun-Jae. That construction was elected with the brick($222mm{\times}106mm{\times}50mm$), the chinese colored tile and plate glass such a modem materials. The new shape of the korean lattice window and the wooden flash-door with glass was used. In Ukyung-Kak, the Chan-Maru(service space) and the kitchen such as a service space or concise utility zone was organically connected. Especially, considered the domesitic activity and circulation, the western kitchen sink and the Chan-Maru(service space) was rationally placed. At the Manun-Jae and the Kyungduck-Dan, the architectural characteristic is that the new shape of windows was used. The lattice window at the Ondol room of Ukyung-Kak, was rgadually added the plate glass and the wood plate. The lattice window with the grid shape at kitchen of that building was adapted japanese grid lattice window in korea at that period. It is the sample that korean traditional house was typically influenced from the japanese resident culture. The Manun-Jae and the Kyungduck-Dan as the modern house kept the form of korean traditional architecture, and was partially adapted a modern characteristic space and modern architectural materials. During the japanese occupancy, these residence can be showed the transition in formally.

• 한국전통조경학회지
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• 제36권3호
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• pp.160-171
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• 2018

꽃창살은 사찰경관을 구성하는 조형요소이며 조망시점이 외부에서 형성되는 장식적 경관요소라는 인식 아래, 경북 영주시 성혈사 나한전의 꽃창살에 표현된 연지의 생태미학적 특성과 도입된 소재의 상징성을 분석 해석한 본 연구의 결과는 다음과 같다. 나한전 정칸 창호에는 사각형 2개가 연속된 문틀 등 비목재 부분을 제외하고 총 176개의 순수 문양이 조각되어 있다. 그 중 중문 어칸(御間) 문살의 기본 개념은 전통정원에서 방지(方池)를 상징하는 연지의 설계언어로 판단된다. 창살 어칸에서 가장 비중이 높은 식물인 연꽃은 '청정(淸淨)'과 '불염(不染)' 그리고 불교의 극락세계인 연화장세계로 인식되며 꽃창살에 묘사된 연꽃은 생성소멸의 특징을 담은 다채로운 형태로 펼쳐져 있어 불연일체(佛蓮一體)의 경관상(景觀像)이 잘 드러나고 있다. 또한 네가래와 벗풀은 실제 연못 주변에서 발견되는 수생식물로 생태적 측면에서도 연지의 수생태계와도 부합되는 사실적 표현일 뿐 아니라 물총새, 백로, 왜가리 등 날짐승의 표현은 정적인 수생태계에 동세와 활력을 불어넣고자 한 생태미학적 발상이다. 또한 동자승을 비롯하여 수(壽) 부(富) 귀(貴) 다남(多男) 등의 기복사상을 구현하고자 한 것으로 판단되는 물총새, 기러기(백로), 물고기, 참게, 개구리 그리고 용 등 7개 분류형의 동물들과 식물이 공생하는 연지풍경을 꽃창살에 연출하였다. 성혈사 나한전 어칸의 꽃창살은 연과 연잎의 생성과 소멸, 서식처의 생태적 적지(敵地), 공생과 먹이연쇄 등 수생태계 측면에서도 매우 부합되는 표현으로 가득하며 이는 상징과 생태미학의 총화이자연지 풍경의 총합적 어울림이다.

• 복식문화연구
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• 제15권6호
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• pp.1053-1062
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• 2007

This study purposed to restructure representative traditional patterns formatively, manufacture actual cultural products with traditional dyeing technique using persimmon, and commercialize the results of the research. Traditionally in Korea, the dying of natural fiber such as cotton, flax and silk with persimmon was called Galmul dyeing, and clothes made through Galmul dyeing were called Galot. Galot was very useful because it is strong, does not pick up dirt easily, dries easily, and is cool in summer. In addition, cloth dyed with persimmon becomes stiff, so it does not need to be starched or ironed after washing. Moreover, it does not transmit heat under direct rays and is highly air-permeable, so it is cool and useful for standing the heat. In this study, we used traditional persimmon dyeing technique, printing traditional patterns fit for contemporary people's aesthetic sense not through dip-dying but through printing. When persimmon dyeing is used in expressing patterns, it produces not only visual effect but also embossing effect due to the characteristic of persimmon that makes printed patterns stiff, so we can obtain unique texture distinguished from other printing methods. We chose seven motive patterns, which were lotus pattern symbolizing eternal life, peony pattern symbolizing wealth and rank and prosperity, character Su(壽) pattern widely used as a symbol of health, bird and cloud pattern in the Goryeo Dynasty, Sahapyeoeuisohwa(四合如意小花) pattern printed on brocade in the Goryeo Dynasty, lattice pattern, cloth pattern on wall paintings from the Period of the Three Kingdoms. From each pattern chosen as a motive was extracted unit patterns and the original pattern was restored using Adobe Illustrator. Restored patterns were restructured to be applied to cultural products fit for contemporary formative sense. Fabrics used in dyeing were cotton, linen, ramie, silk, and polyester. Although the same persimmon dyeing was applied, we produced different feelings of patterns using various fabrics and in some cases gold and silver powder was added for the effect of gloss in addition to the embossing of patterns. Using printed fabrics we manufactured tea pads, place mats, cushions, wrapping cloth for gifts, wallet, lampshades.

• 응용통계연구
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• 제10권1호
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• pp.121-136
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• 1997

공간자료는 공간 위치의 변화에 따라 관찰되는 자료이다. 본 논문에서는 공간자료를 가지고 행 방향, 열 방향, 대각선 방향으로 나누어 시계열의 모형 식별에서 사용되는 Box-Jenkins 방법과 식별통계량, 행태인식법을 공간 자기회귀모형에 적용하여 모형을 식별해 보고 모의실험을 통하여 식별 방법들을 비교해 보았다.