• 복식문화연구
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• 제16권4호
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• pp.661-680
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• 2008

The purpose of this study is to examine to change in the Chinese women's clothing according to the inflow of Western culture in the first half of the both century As for the research method, both literature and visual data are reviewed. Research results are as follows: The Step of transition in clothing by period followed beginning stage, adopted stage, early developed stage, fully developed stage, and static stage. fully developed stage showed a perfect compromise while being applied to Chinese costume with being introduced a three-dimensional cutting method of western clothing even to the constitution as well as to the appearance. Design elements from western clothing are as follows. The transition of silhouette is box silhouette, trapeze silhouette, shift silhouette, and fitted silhouette. In detail and trimming, tailored, band, convertible, shirts collar and zigzag, scallop, camisole neckline and puff, cap sleeve and flounced, bell shaped cuffs and western button, zipper, etc. are adopted. Finally, the Chinese modern style are formed by accepting and transforming the western clothing based on the traditional Chinese clothing.

• Structural Engineering and Mechanics
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• 제63권2호
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• pp.171-180
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• 2017

Static and dynamic instability of a viscoelastic carbon nanotube (CNT) embedded on a thermo-elastic foundation are investigated, in this research. The CNT is modeled based on Euler-Bernoulli beam (EBB) and nonlocal small scale elasticity theory is utilized to analyze the structure. Governing equations of the system are derived using Hamilton's principle and differential quadrature (DQ) method is applied to solve the partial differential equations. The effects of variable axial load and diverse boundary conditions on static/vibration instability are studied. To verify the result of the DQ method, the Galerkin weighted residual approach is used for the instability analysis. It is observed appropriate agreement for results of two different solution methods and satisfactory accuracy with those obtained in prior studies. The results of this work could be useful for engineers and designers in order to produce and design nano/micro structures in thermo-elastic medium.

• 대한조선학회논문집
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• 제42권6호
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• pp.551-558
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• 2005

In this paper, horizontal manoeuvrability of an underwater vehicle near free surface was investigated. Planar Motion Mechanism(PMM) tests were performed at the shallow depth within 4.5 times of vehicle's diameter. Hydrodynamic coefficients related to the horizontal movement were estimated from the measured data using Least SQuare(LS) method and analyzed at each submerged depth. Furthermore, horizontal dynamic stability, trajectory of turning and zigzag test were investigated for the various depths. As underwater vehicle is positioned nearer to the free surface, forces increase and moment decreases. Tested model was found to be stable only at the depth 0.5 times of vehicle's diameter.

• 한국시뮬레이션학회논문지
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• 제14권3호
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• pp.21-31
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• 2005

In state-of-the-art games, characters can move in a goal-directed manner so that they can move to the goal position without colliding obstacles. Many path-finding methods have been proposed and implemented for these characters and most of them use the A* search algorithm. When .the map is represented with a regular grid of squares or a navigation mesh, it often takes a long time for the A* to search the state space because the number of cells used In the grid or the mesh increases for higher resolution. Moreover the A* search on the grid often causes a zigzag effect, which is not optimal and realistic. In this paper we propose to use visibility graphs to improve the search time by reducing the search space and to find the optimal path. We also propose a method of taking into account the size of moving characters in the phase of planning to prevent them from colliding with obstacles as they move. Simulation results show that the proposed method performs better than the grid-based A* algorithm in terms of the search time and space and that the resulting paths are more realistic.

• Archives of Reconstructive Microsurgery
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• 제14권2호
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• pp.131-137
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• 2005

The extensor digitorum brevis (EDB) muscle island flap is a reliable, safe method for coverage of foot and ankle. There are many variation in approach such as curvilinear, zigzag, L-shaped or vertical longitudinal incision for exposure of the EDB muscle. These approaches use only single incision excluding the distal incision for exposure of the distal tendon. Since dorsalis pedis artery vascular bundle and sinus tarsi branch of the lateral tarsal artery both requires careful dissection, single incision alone may cause not only difficulty in exposure but also skin sloughing at donor site. So we tried to modify the approach into two parallel longitudinal incision, one for dorsalis pedis vascular bundle and the other for sinus tarsi branch exposure. The author treated 9 patient with EDB muscle flap. We used single incision in six patients, and two parallel incision in three patients. All the flap survived. In two parallel incision group, dissection was more easy and rapid. So we would like to suggest that two parallel longitudinal incision approach is better method than the single incision technique for exposure of the EDB muscle flap.

• 소성∙가공
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• 제30권6호
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• pp.284-290
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• 2021

Manufacturing using a 3D printer has recently increased in many fields and the material extrusion method, which is a lamination method, is commonly used. Since it uses a plastic material, the strength of the output of 3D printing is lower than that of steel material. For this reason, research on improving the mechanical properties of the output of 3D printing is continuously being conducted. In this study, tensile strength was compared with changes in the material type (PLA+, ABS) and density (60, 80, and 100%), layer height (0.1, 0.2, and 0.3 mm), layer direction (transverse and lengthwise), and fill pattern (zigzag, honeycomb, and concentric) among 3D printing output conditions. Tensile tests according to 3D printing output conditions were performed using a Universal Testing Machine. The results showed that tensile strength ranged from 21.10 MPa to 43.65 MPa according to the 3D printing output conditions.

• Acta Via Serica
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• 제7권2호
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• pp.39-64
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• 2022

Ancient Iranians highly esteemed the horse and horse tacks, one of which is the jul (saddlecloth). It is a felt, sheepskin, or woven pad placed between the horse's back and saddle. The aim of this paper is to identify and categorize jul designs in the Sāsānian period. The research questions are about the variety of jul designs and how to categorize them. This is fundamental research and the method is descriptive and analytical. Neither a jul nor a saddle-cover remains from the Sāsānian period, therefore the statistical population includes all available items, such as metal and stone items and parget and plasterworks, in which juls are recognizable. Due to the scarcity of such items, all the available samples were studied; so the sampling method is a total enumeration. This is documentary research by means of note-taking and using reliable websites; the data has been analyzed qualitatively. The results show that jul designs were not diverse in the Sāsānian period. All-over designs were dominant. In terms of pattern types, these designs are classified into five groups, each of which has its own formal and aesthetic characteristics: all-over design with a four-petal flower pattern, allover design with a checkered pattern, all-over design with a spotted pattern, allover design with a tiger stripe pattern, and all-over design with a zigzag pattern.

• 대한조선학회논문집
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• 제61권4호
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• pp.247-257
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• 2024

The present study suggests a data-driven multivariate identification method based on principal component analysis and shows an application to ship dynamics modeling in maneuver. A reduced order model of ship dynamics is built by linear combination of three principal components acquired from large angle zigzag maneuver test. For a given kinematic state with three variables, a proper span is found by least square method, therefore accompanying hydrodynamic force and moment is determined. Suggested dynamics model correctly estimates hydrodynamic force and moment, thus it showed good agreement in maneuver simulation with that of conventional ship dynamics model obtained by system identification of captive model tests.

• 컴퓨터교육학회논문지
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• 제16권3호
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• pp.49-60
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• 2013

본 연구는 블렌디드 이러닝이 대학의 강의실 위주의 수업에서 효과성을 향상시킬 수 있는지를 검증하고자 하였다. 먼저, 수업 사례를 분석하여 블렌디드 이러닝 운영방식으로 CbE(Class based E-learning)와 EbC(E-learning based Class) 방식을 도출하고, 수업구조로 Z형(Zigzag model)과 H형(Ladder model)을 정의하였다. 연구의 목적을 달성하기 위하여 A대학의 "엑셀실무" 과목에 CbE 방식의 H형 블렌디드 이러닝을 운영하였다. 집단은 사이버강의 학습참여비율의 50%이상인 집단(그룹 1)과 그렇지 않은 집단(그룹 2)으로 나누고, 자료의 분석은 $x^2$-검정, t -검정으로 학업 성취도를 비교하였다. 사이버강의 학습참여비율과 합격여부의 관계를 규명하기 위해 로지스틱 회귀분석을 실시하였다. 검정 결과, 그룹 1이 학업 성취도에서 통계적으로 유의하게 높게 나타났다. 로지스틱 회귀분석 결과에서 사이버강의 학습참여비율은 합격여부를 예측하는 유의미한 변인으로 규명됨에 따라, 블렌디드 이러닝의 효과성이 확증되었다. 연구 결과, H형 블렌디드 이러닝은 강의실 수업의 단점을 보완하여 학업 성취도와 학습 만족도를 향상시키고, 학습자가 블렌디드 이러닝 수업 방식에 대해 긍정적인 인식을 갖도록 한 것으로 나타났다. 끝으로 성공적으로 블렌디드 이러닝을 운영하기 위한 전략과 대학에서의 활성화 방안에 대해 제언하였다.

• Advances in nano research
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• 제8권3호
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• pp.215-228
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• 2020

In this paper, a new method based on the Sander theory is developed for SWCNTs to predict the vibrational behavior of length and ratio of thickness-to-radius according to various end conditions. The motion equation for this system is developed using Rayleigh-Ritz's method. The proposed model shows the vibration frequencies of armchair (5, 5), (7, 7), (9, 9), zigzag (12, 0), (14, 0), (19, 0) and chiral (8, 3), (10, 2), (14, 5) under different support conditions namely; SS-SS, C-F, C-C, and C-SS. The solutions of frequency equations have been given for different boundary condition, which have been given in several graphs. Several parameters of nanotubes with characteristic frequencies are given and vary continuously in length and ratio of thickness-to-radius. It has been illustrated that an enhancing the length of SWCNTs results in decreasing of the frequency range. It was demonstrated by increasing of the height-to-radius ratio of CNTs, the fundamental natural frequency would increase. Moreover, effects of length and ratio of height-to-radius with different boundary conditions have been investigated in detail. It was found that the fundamental frequencies of C-F are always lower than that of other conditions, respectively. In addition, the existence of boundary conditions has a significant impact on the vibration of SWCNTs. To generate the fundamental natural frequencies of SWCNTs, computer software MATLAB engaged. The numerical results are validated with existing open text. Since the percentage of error is negligible, the model has been concluded as valid.