• 인터넷정보학회논문지
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• 제17권4호
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• pp.35-42
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• 2016

최근 제한적인 마커기반 증강현실의 여러 가지 단점들을 보완하기 위해 사용자의 얼굴, 발, 손 등을 활용한 비 마커기반 증강현실 시스템에 관한 연구들이 활발하게 진행되고 있는 추세이다. 또한 대부분의 기존 증강현실 시스템들은 사용자에게 보여주는 것과 기본적인 상호작용에 목표를 두고 강체를 증강하여 수행되는 경우가 많았다. 본 논문에서는 단지 보여주는 것에 국한되는 것이 아니라 여러 분야에서 활용이 가능한 변형물체를 사용자와의 상호작용을 바탕으로 시뮬레이션을 제공하는 비 마커기반의 증강현실 시스템을 설계 및 구현하였다. 변형물체는 질량-스프링 모델, 유한 요소 모델 두 가지 방법을 주로 사용하여 구현한다. 질량-스프링 모델은 실시간 시뮬레이션에 장점이 있으며 유한 요소 모델은 변형물체의 정밀함을 나타낼 때 장점을 가진다. 본 논문에서는 실시간으로 시뮬레이션을 목표로 하고 있기 때문에 질량-스프링 모델을 기반으로 하는 테트라헤드론 구조를 이용하여 변형물체를 구현하였다. 변형물체의 자연스러운 움직임을 실시간으로 시뮬레이션하기 위해 키넥트 SDK를 통해 사용자의 손의 위치를 추적 하고, 손의 위치 변화량을 바탕으로 힘을 계산한다. 이를 바탕으로 $4^{th}$ order Runge-Kutta Integration 수치적분법을 이용하여 물체의 다음 위치를 계산하여 시뮬레이션 하도록 하였다. 그리고 자연스러운 동작을 표현하기 위해서 사용자의 손을 통해 물체에 작용하는 힘이 너무 많이 작용하지 않기 위해 제스처에 임계값을 정하였으며 해당 임계값을 넘는 힘이 작용할 경우 임계값으로만 적용되도록 설정하였다. 각 실험을 5회씩 반복하였으며 실험에 따른 시뮬레이션 연산속도를 분석하였다. 본 논문을 통해 구현한 변형물체를 활용한 비 마커기반 증강현실 시스템을 바탕으로 기존의 강체 기반의 증강현실에서 활용하기 힘들었던 의료, 교육 및 다양한 방면으로 시뮬레이션이 가능할 것으로 기대한다.

• 한국연소학회:학술대회논문집
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• 한국연소학회 2012년도 제45회 KOSCO SYMPOSIUM 초록집
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• pp.329-332
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• 2012

The droplet behavior of 83.9 wt.% HAN water solution was investigated experimentally with various ambient temperature and nitrogen environment. At the initial stage of evaporation under thermal decomposition temperature of HAN, gradual decreasing of droplet diameter was observed. After that, the droplet started to expand due to the internal pressure build up by water nucleation inside the droplet. The micro explosion was observed at higher temperature than the decomposition temperature of HAN and the remaining droplet showed similar behavior of single composition droplet. The decreasing rate was augmented as the ambient temperature increasing.

• The Journal of Asian Finance, Economics and Business
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• 제9권4호
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• pp.109-120
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• 2022

This study has incorporated the mechanics-dynamics-emotions (MDE) and two behavioral learning paths to investigate the customers' co-creation behavior in Taiwan. The intuitive path begins with a gamification design that reflects the customers' proactive and innovative behavior; the cognitive path begins with persuasion knowledge remarks based on rational and reactive reasoning. These two paths conclude what forms user co-creation. The study collects data of 505 active social media users in Taiwan and employs structural equation modeling. The empirical findings demonstrate persuasive knowledge and gamification design are significantly associated with self-reference, and in turn, positively associated with co-creation. It indicates that cognitive behavior plays the main role in forming co-creation. Participants are more drawn to co-creation behaviors by the marketing contents that prompt reactive behaviors than proactive ones. Therefore, marketing managers can use appropriate stimuli to enhance co-creation behavior. Companies can design activities related to users, and more accessible for reactive, instead of proactive behavior, i.e., asking for their initiatives. It also suggests that companies' marketing campaigns should involve key opinion leaders matching the product image and the target audience's preferences. The novelty of this study is to introduce a novel augmented MDE framework to extend the "dynamics" into the incubation and implementation stage.

• 패션비즈니스
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• 제14권5호
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• pp.78-92
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• 2010

The culture phenomenon, which the desire of self expression is noticeable and the diversity of gender identity is widely accepted, simply makes a difference in the lifestyle of one human being rather than the dichotomous classification of male and female. Now, the delicate and aesthetic sensitivity classified as the feminine characteristics is no longer the exclusive property of female and this refers to substituting it as a social gender from the concept of biological sex. This phenomenon has influenced on the male culture and is creating various codes according to the cultural gender extended from the gender as a social role. Also, the transition into the western lifestyle has extended the aesthetic emotion to accommodate new codes from the diversification and globalization of lifestyle. The mansumer power, which does not care too much about the money for the emotionally attached items, has enabled various fashion styles. After analyzing the diversified clothing behavior conducted by these people in connection with the social phenomenon, First, this shows the phenomenon of emotional value pursuit that finds pleasure over the clothing as the item of augmented reality is added to the concept of play, in which the real space referred to as garment and virtual space of playing the rock, paper and scissors game meet together within the augmented reality. Second, the convergence concept has enabled the coordination of new style by obscuring the area of design concept and this refers to the changes in design from the development of new items and transformation into double-style details. Third, the divergence that intensively provides specific use/convenience and specialized value shows a change in the fashion market from the phenomenon that admits various gene rations of culture and specifically, takes differently about the recognition of middle-aged males. Fourth, the variety seeking tendency receives attention as the value of future design together with the phenomenon of discriminative value pursuit. In the male fashion, it is linked to the collaboration with the design area and this tells that the fashion with the narcissistic cross-dressing and motto of neutral gender without being sided to male/female is rising.

• 한국정밀공학회지
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• 제31권1호
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• pp.21-28
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• 2014

Recently, several researchers made their endeavor to manufacture the photobioreactor(PBR) with characteristic shapes form vacuum and blow forming process. Hence, behaviors of the transparent polycarbonate(PC) plate in the high temperature region should be examined to obtain the desired PBR case via vacuum and blow forming processes. The aim of this paper is to investigate tensile behavior of PC plate in the high temperature. Various tensile tests were performed using high temperature tensile testing machine. The influence of tensile speed, thickness and ambient temperature on tensile behavior in the high temperature was examined. The flow stress and tensile strength augmented when the tensile speed increased. In order to obtain proper flow curves with strain rate effects for different temperature of specimen, G'sell-Jonas model was adopted. The material constants of the G'sell-Jonas model were estimated. The flow curves of the PC plate considering the tensile speed, specimen thickness and temperature were obtained.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 1996년도 추계학술대회논문집
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• pp.38-47
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• 1996

Sectional analysis program for plane strain or axisymmetric geometry of aluminum alloy sheet metals was developed. For modeling the anomalous behavior of aluminum alloy, Barlat's strain rate potential and Hill's 1990 non-quadratic yield theory arranged under the plane stress assumption were employed. 2-D rigid-viscoplastic FEM formulation based on the bending-augmented membrane theory was derived, solving simultaneously force equilibrium as well as non-penetration condition. Isotropic hardening law was also assumed for yielding behavior. To verify the validity and availability of the developed program, 2-D stretch/draw forming process for plane strain geometry and cylindrical cup deep drawing process for axisymmetric geometry were simulated.

• Structural Engineering and Mechanics
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• 제84권6호
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• pp.767-782
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• 2022

In this paper, the nonlinear vibration behavior of the spiral stiffened multilayer functionally graded (SSMFG) cylindrical shells exposed to the thermal environment and a uniformly distributed harmonic loading using a semi-analytical method is investigated. The cylindrical shell is surrounded by a nonlinear viscoelastic foundation consisting of a two-parameter Winkler-Pasternak foundation augmented by a Kelvin-Voigt viscoelastic model with a nonlinear cubic stiffness. The distribution of temperature and material constitutive of the stiffeners are continuously changed through the thickness direction. The cylindrical shell has three layers consisting of metal, FGM, and ceramic. The interior layer of the cylindrical shell is rich in metal, while the exterior layer is rich in ceramic, and the FG material is located between two layers. The nonlinear vibration problem utilizing the smeared stiffeners technique, the von Kármán equations, and the Galerkin method has been solved. The multiple scales method is utilized to examine the nonlinear vibration behavior of SSMFG cylindrical shells. The considered resonant case is 1:3:9 internal resonance and subharmonic resonance of order 1/3. The influences of different material and geometrical parameters on the vibration behavior of SSMFG cylindrical shells are examined. The results show that the angles of stiffeners, temperature, and elastic foundation parameters have a strong effect on the vibration behaviors of the SSMFG cylindrical shells.

• 감성과학
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• 제22권3호
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• pp.65-76
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• 2019

AR (Augmented Reality; 증강현실)은 가상의 이미지를 현실 세계에 덧붙이는 기술이다. 본 연구는 온라인으로 활발히 소비되는 품목인 음식을 AR로 제시했을 때의 효과를 살펴보고자 한다. 본 연구에서는 AR 음식 이미지가 구매 의사와 사용자 참여에 미치는 영향을 정적인 음식 이미지와 비교하여 알아보았고, 이미지 제시 방식과 구매 의사와의 관계를 사용자 참여가 매개하는지도 살펴보았다. 참가자는 두 조건 중 하나로 무선할당되어 AR 조건은 AR로 음식 이미지를 보고 정적 조건은 정적인 음식 이미지를 보았다. 그 후 참가자들은 사용자 참여와 구매 의사를 묻는 설문에 응답했다. 실험 결과, AR로 음식을 본 조건이 정적인 이미지를 본 조건보다 사용자 참여가 더 높았고, 구매 의사 또한 더 높은 것으로 나타났다. 매개 분석 결과, 사용자 참여의 간접효과는 통계적으로 유의했으며, 사용자 참여는 이미지 제시 방법과 구매 의사 간의 관계를 완전매개하는 것으로 나타났다. 하위요인별로 매개 분석을 진행한 결과, 사용자 참여의 하위 척도 중에서도 심미성의 완전매개 효과가 나타났다. 연구 결과를 정리하면, AR로 음식 이미지를 보게 되면 심미성이 높아지며, 높은 심미성은 음식에 대한 높은 구매 의사로 이어진다. 따라서 본 연구는 음식 이미지를 제시하는 방법으로 AR 기술이 효과적으로 사용될 수 있음을 밝히고 있다.

• 한국의류산업학회지
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• 제15권5호
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• pp.733-742
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• 2013

This research explores the relationship between body image and clothing behavior in order to enhance self-efficacy among multicultural children based on a survey of 167 children. The statistical analysis indicated that children value(in decreasing order)family-esteem, friend-esteem, self-esteem, and school-esteem. School-esteem is the lowest, with boys displaying slightly higher levels of esteem than girls. A boys' self-esteem appears enhanced by higher satisfaction with overall appearance and weight; however, girls' self-esteem helped them address appearance and physical characteristics with positive attitudes. In addition, the clothing behavior of children significantly influenced self-esteem to differing degrees based upon gender. A boys' self-esteem can be increased by having them show interest in clothes rather than letting them wear similar clothes to their friends because their self-esteem can be heightened by higher interests and lower similarity. A girls' self-esteem can be augmented by the clean management of clothes and comfortable wearing due to their emphasis on manageability and comfort. This survey was limited to the Gyeonggi and Inchon area and leaves room for future studies.

• 정보처리학회논문지:소프트웨어 및 데이터공학
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• 제5권5호
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• pp.243-250
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• 2016

최근 가상현실(VR, virtual reality)이나 증강현실(AR, augmented reality)이 주목받으면서 이에 관한 컴퓨터 그래픽스(computer graphics)연구들이 활발히 진행되고 있다. 특히, 인간의 동작을 가상의 공간에서 구현하는 방법에 관한 연구들이 활발히 진행되고 있다. 하지만 많은 연구가 인간의 일반적인 동작에 한정되어 있다. 본 연구에서는 역운동학(IK, inverse kinematics)을 이용한 스포츠클라이밍 자세생성과 동작제어를 통해 인간의 일반적인 동작 이외에 스포츠클라이밍과 같은 특수 목적의 다양한 동작들을 삼차원의 가상공간에서 가상 인물(virtual character)의 자세 및 동작을 생성하는 시스템을 제안한다. 역운동학(IK, inverse kinematics) 기법을 통한 자세 생성은 역운동학 함수(IK function)와 실제 데이터를 통한 기본자세 애니메이션을 제작, 이를 활용하여 사실성을 더하고 자연스러운 자세 및 동작을 생성한다. 본 논문에서는 스포츠 클라이밍의 기본동작을 이용하여 올바른 자세와 함께 실제와 유사한 동작을 생성하는 시스템을 설계하였다. 이를 통해 클라이머를 위한 학습 프로그램이나 클라이밍 게임 같은 다양한 형태의 스포츠 클라이밍 콘텐츠를 제작하는데 도움이 되고자 한다.