• 설비공학논문집
• /
• 제23권11호
• /
• pp.726-732
• /
• 2011

The aerodynamic and aeroacoustic performance of discharge grille of outdoor unit of air-conditioner was investigated in this study. Discharge grille is one of outdoor unit's important parts to affect the flow rate and Overall Sound Pressure Level(OSPL). New type of discharge grille was suggested based on the results of numerical simulation. To simulate the flow pattern near the propeller fan, commercial flow solver FLUENT was used. Sliding mesh method was used for rotating propeller fan and initial condition for unsteady model was calculated by Multiple Reference Frame(MRF) method. To minimize the interaction noise between fan blade wake and discharge grille, new discharge grille has radial rib which is aligned with trailing edge of fan blade. And inclined radial rib was adopted for reducing flow rate drop in discharge grille. The optimization of inclined angle of radial grille was performed experimentally.

• Smart Structures and Systems
• /
• 제18권3호
• /
• pp.525-540
• /
• 2016

The CFRP-confined circular concrete-filled steel tubular column is composed of concrete, steel, and CFRP. Its failure mechanics are complex. The most important difficulties are lack of an available method to establish a relationship between a specific damage mechanism and its acoustic emission (AE) characteristic parameter. In this study, AE technique was used to monitor the evolution of damage in CFRP-confined circular concrete-filled steel tubular columns. A fuzzy c-means method was developed to determine the relationship between the AE signal and failure mechanisms. Cluster analysis results indicate that the main AE sources include five types: matrix cracking, debonding, fiber fracture, steel buckling, and concrete crushing. This technology can not only totally separate five types of damage sources, but also make it easier to judge the damage evolution process. Furthermore, typical damage waveforms were analyzed through wavelet analysis based on the cluster results, and the damage modes were determined according to the frequency distribution of AE signals.

• Smart Structures and Systems
• /
• 제30권1호
• /
• pp.49-62
• /
• 2022

Experimental and discrete element methods were used to investigate the effects of triple joints lengths and triple joint angle on the failure behavior of rock mass under uniaxial compressive test. Concrete samples with dimension of 20 cm × 20 cm × 5 cm were prepared. Within the specimen, three imbedded joint were provided. The joint lengths were 2 cm, 4cm and 6 cm. In constant joint lengths, the angle between middle joint and other joints were 30°, 60°, 90°, 120° and 150°. Totally 15 different models were tested under compression test. The axial load rate on the model was 0.05 mm/min. Concurrent with experimental tests, the models containing triple joints, length and joint angle are similar to the experiments, were numerical by Particle flow code in two dimensions (PFC2D). Loading rate in numerical modelling was 0.05 mm/min. Tensile strength of material was 1 MPa. The results show that the failure behaviors of rock samples containing triple joints were governed by both of the angle and the length of the triple joints. The uniaxial compressive strengths (UCS) of the specimens were related to the fracture pattern and failure mechanism of the discontinuities. Furthermore, it was shown that the compressive behavior of discontinuities is related to the number of the induced tensile cracks which are increased by decreasing the joint length. Along with the damage failure of the samples, the acoustic emission (AE) activities are excited. There were only a few AE hits in the initial stage of loading, then AE hits rapidly grow before the applied stress reached its peak. In addition, every stress drop was accompanied by a large number of AE hits. Finally, the failure pattern and failure strength are similar in both methods i.e., the experimental testing and the numerical simulation methods.

• 한국의류산업학회지
• /
• 제13권5호
• /
• pp.734-742
• /
• 2011

This study has been undertaken as a basic research for automatic pattern design for baseball uniforms manufactured under custom-MTM system, propose building up of a system whereby various partial patterns are combined under an automatic design system and develop a multi-combination type pattern searching algorithm which allows development of a various designs. As a result of this, type classification based on pattern design elements includes side, open, collar, facing and panel type. Design have been divided into coarse classification ranging from level 1 to 7 according to pattern design elements, based on a design distribution chart. Out of 7 such levels, 3 major types determining design which are, more specifically, level 1 sleeve type, level 2 open type and level 3 collar type, have been taken and combined to determine a total of 12 types to be used for design classification codes. Respective name of style and patterns have been coded using alphabet and numerals. Totally, pattern searching algorithm of multi-combination type has been developed whereby combination of patterns belonging to a specific style can be retrieved automatically once that style name is designated on the automatic pattern design system.

• 한국항행학회논문지
• /
• 제15권6호
• /
• pp.1163-1172
• /
• 2011

본 논문은 여전히 큰 영향력을 가지고 있는 매체인 TV와 가족, 특히 아동과의 관계에 대해서 살펴보고자 하였다. 지금까지는 주로 TV의 시청이 가족 또는 가족의 구성원에 어떠한 영향을 미치는가를 살펴보았다면 본 연구에서는 가족의 형태에 따라서 TV의 시청행태가 어떻게 달라지는지를 규명해보고자 하였다. 특히 TV의 시청에 많은 시간을 할애하고 TV 프로그램 선호에 민감한 아동들을 대상으로 하여 가족의 유형과 가족 커뮤니케이션 패턴에 따라서 아동의 TV 시청이 어떻게 달라지는지를 연구하고자 하였다.

• 한국언어정보학회:학술대회논문집
• /
• 한국언어정보학회 2002년도 Language, Information, and Computation Proceedings of The 16th Pacific Asia Conference
• /
• pp.157-165
• /
• 2002

This paper describes our ongoing Korean-Chinese machine translation system, which is based on verb patterns. A verb pattern consists of a source language pattern part for analysis and a target language pattern part for generation. Knowledge description on lexical level makes it easy to achieve accurate analyses and natural, correct generation. These features are very important and effective in machine translation between languages with quite different linguistic structures including Korean and Chinese. We performed a preliminary evaluation of our current system and reported the result in the paper.

• 대한기계학회논문집
• /
• 제17권7호
• /
• pp.1783-1793
• /
• 1993

Pattern recognition technique using fuzzy c-means algorithm and multilayer perceptron was applied to classify tool wear states in turning. The tool wear states were categorized into the three regions 'Initial', 'Normal', 'Severe' wear. The root mean square(RMS) value of acoustic emission(AE) and current signal was used for the classification of tool wear states. The simulation results showed that a fuzzy c-means algorithm was better than the conventional pattern recognition techniques for classifying ambiguous informations. And normalized RMS signal can provide good results for classifying tool wear. In addition, a fuzzy c-means algorithm(success rate for tool wear classification : 87%) is more efficient than the multilayer perceptron(success rate for tool wear classification : 70%).

• 한국생활과학회지
• /
• 제22권4호
• /
• pp.667-676
• /
• 2013

The purpose of this study is to establish a new method to develop the textile pattern design using Saengbul flower in Seo-cheon flower garden of Jeju Myth, in other words, to create mythic textile patterns by borrowing effectively from the mythic image of Saengbul flower. Seo-cheon flower garden is an incantation space and Saengbul flower means pregnance. Therefore, we drew Camellia flower motifs from a mythic image based on archetypal symbols about the Saengbul flower, and created mythic patterns. In order to achieve this textile pattern design, Adobe CS5(Photoshop, Illustrator) and Texpro were used to design the motifs of Saengbul flower, and then they were arranged in a square pattern and diamond pattern of Richard M. Proctor' set layout. And to conclude, development of the creative textile pattern design using the mythic contents of the Jeju Myth contribute to invigoration the fashion industry and regional culture contents projects in Jeju, and also become the basis of creating added valued to it.

• 한국생활과학회지
• /
• 제22권4호
• /
• pp.651-665
• /
• 2013

The purpose of this research was to investigate preference and clothing images for T-shirts utilizing Hyojemunja Textile Pattern. The results of this study showed that the secondary students who participate in the study had low interest in Folk-painting and that the female students were more willing to buy T-shirts utilizing The Hyojemunja Textile Pattern than the others. Secondary students preferred letters-pattern to other ones of T-shirts and they opted for the patterns with black curve scripts and the patterns located in upper parts of T-shirts. However, the participants considered straight scripts more sophisticated, unique and feminine than curve scripts and therefore, this awareness helped them become more interested in Hyojemunja Textile Pattern. The findings of the study may suggest T-shirts utilizing Hyojemunja Textile Pattern can give those who have a low interest in Folk-painting increased chances to learn Folk-painting in secondary education.

• 한국생활과학회지
• /
• 제22권6호
• /
• pp.649-658
• /
• 2013

Various paper ornaments appear in Gut, the rite of shaman in Jeju, and these are frequently called Gime, Gimekijeon or Gimejeonji. Gime are slips of white or colored paper, made to resemble the shape of god and used in the ritual shaman dances of Jeju. These Gime are hung around an altar, fastened to the end of a green bamboo pole, or held in the shaman's hands when they dance. The purpose of the study is to develop textile design based on the formative features of Gime, as a way of using Myth of shaman in Jeju. This study is used Gime made by 'Kim Yoon-Su' Simbang (shaman) who plays a role of Intangible Cultural Assets of The 71th 'Jeju Chilmeoridang Yeongdeunggut'. As a result, it was to develop the Komusaljang pattern, Seongjukkot pattern, Jijeon pattern, Jowoangki pattern and Cheoljjukdae pattern design of Jeju image using Gime that is one of the unique, indigenous pattern of Jeju.