• Korean Journal of Computational Design and Engineering
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• v.9 no.4
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• pp.397-405
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• 2004

Texture mapping is the process of covering 3D models with texture images in order to increase the visual realism of the models. For proper mapping the coordinates of texture images need to coincide with those of the 3D models. When projective images from the camera are used as texture images, the texture image coordinates are defined by a camera calibration method. The texture image coordinates are determined by the relation between the coordinate systems of the camera image and the 3D object. With the projective camera images, the distortion effect caused by the camera lenses should be compensated in order to get accurate texture coordinates. The distortion effect problem has been dealt with iterative methods, where the camera calibration coefficients are computed first without considering the distortion effect and then modified properly. The methods not only cause to change the position of the camera perspective line in the image plane, but also require more control points. In this paper, a new iterative method is suggested for reducing the error by fixing the principal points in the image plane. The method considers the image distortion effect independently and fixes the values of correction coefficients, with which the distortion coefficients can be computed with fewer control points. It is shown that the camera distortion effects are compensated with fewer numbers of control points than the previous methods and the projective texture mapping results in more realistic image.

• Journal of the Korea Convergence Society
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• v.9 no.4
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• pp.127-135
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• 2018

Men are ambivalent since they have good and evil at the same time. To concretize this evil further, men created symbolic icons of evil with formative elements by giving shape to it. Thus, this researcher would investigate and analyze the concept of evil and the formativeness appearing when the essence of humans' evil is expressed as symbolic icons. For this purpose, items for the classification of formativeness were constructed, and questionnaires were prepared to draw the results of an analysis as follows. As for the type of composition, symbolic icons of evil were expressed by pictures or signs, rather than letters. The objects of expression were characters and animals in myths. As for the layout, most were expressed in a radial shape. As for the method of description, most were in the forms of simplicity and complexity, and as for the outer form, most were circles. It was noted that the symbolic icons in which items with these types of composition had high scores, were drawn, used and developed in formative relations with each other.

• The Journal of Korean Academy of Orthopedic Manual Physical Therapy
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• v.13 no.2
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• pp.69-78
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• 2007

Purpose: The purpose of this study was to assess the effectiveness of Extracorporea Shock - Wave Therapy (ESWT) on the pain and improvement of shoulder joint function which is one of the available medical treatment in patients with frozen shoulder. Object and Methods: 26 patients with frozen shoulder, with 26 patients assigned to two groups; a control treatment group (n=12) and a ESWT application group (n=14). In the ESWT application group, the patients received general physical therapy, and then they received ESWT. In the control treatment group, the patients received only general physical therapy. These medical treatments was conducted total 6 time for 3 weeks. To investigate the effectiveness of the treatment after the each group's treatment. Pain was measured by Visual Analogue Scale (VAS) which is divided into 10 ranks and shoulder joint function was measured by CSA(Constant Shoulder Assessment scale). Results: 1. There was a statistical significance of measured by shoulder pain degree in both group but, the result of a ESWT application group shows more significance than that of a control treatment group. 2. There was a statistical significance of measured by CSA in both group but, the result of a ESWT application group shows more significance than that of a control treatment group. Conclusion: We think that treatment with General physical therapy and ESWT together for the patients with frozen shoulder is more effective and more safe method to shoulder joint function improvement and decrease of pain.

• Physical Therapy Korea
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• v.23 no.1
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• pp.38-45
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• 2016

Background: Chronic back pain shows a high correlation with lumbar disability, physical disability for daily activities, and psychosocial factors, such as depression. Object: The purpose of this study was to examine the correlation of the level of pain and disability with psychosocial factors, which are potential disturbance variables, in patients with chronic lumbar pain. Method: The sample included 258 patients, who had complained of chronic lumbar pain for more than three months. The Quadruple Visual Analogue Scale was used to measure the level of pain, and a Korean version of Oswestry Disability Index was used to measure the level of disability. Psychosocial factors were measured using the Tampa scale for Kinesiophobia-11, Fear Avoidance Beliefs Questionnaire, and Pain Self-Efficacy Questionnaire. The collected data was analyzed using PASW 18.0, and an independent samples t-test was used to examine frequency, percentage, mean, and standard deviation of sociodemographic characteristics and major variables. Pearson's correlation coefficient was used to investigate the correlation between the level of pain and disability and psychosocial factors. Stepwise multiple regression analysis was done to determine the level of pain and psychosocial factors of functional disorder. The significance level was set at ${\alpha}=.05$. Result: There is a strong correlation between the level of pain and functional disorder and psychosocial factors in patients with chronic lumbar pain. The study also revealed that as the levels of pain and fear avoidance increase, pain self-efficacy decreases. Conclusion: The results suggest that negative perceptions towards pain, limitations of physical movement, and severe fear avoidance directly affect the decrease in pain self-efficacy. Therefore, it is recommended to test pain self-efficacy when measuring the level of pain and disability in patients with chronic low back pain.

• Journal of Digital Convergence
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• v.13 no.6
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• pp.267-273
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• 2015

Recently, a wide range of products incorporating cutting-edge technology are being introduced in various sectors of design. Belkin's WeMo or Phillips' Hue are representative examples. In this context, the color-responsive lighting bookcase is a design product that would satisfy the needs of contemporary consumers who seek entertainment in their purchases. By installing lightings that change color according to the user's behavior, this design reconceptualizes the bookcase as a source of entertainment rather than a mundane object of household furnishing. The lighting apparatus can be detached and reattached, serving as stand-alone equipment. The lighting bookcase is modularized, comprising extensions equipped with MCU (Micro Controller Unit), RGB LED and color sensors. The bookcase as a whole is extendable towards four directions up to nine units with the lighting bookcase at the center. The extended, multiple lighting bookcases are wired to receive power from the main bookcase, and are equipped with RGB LEDs but not with MCUs or color sensors. Receiving power and color signals from the main lighting bookcase, the sub-bookcases feature changing shades of color. Also, it includes IoT(internet of Things). This study is a proposal of a design product, modularized to control the shades of the bookcase lighting using these sensors.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.45 no.6
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• pp.95-101
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• 2008

In this paper, we present a new smoothing algorithm for variable depth mapping for real time stereoscopic image for 3D display. Proposed algorithm is based on the physical concept, called Laplacian equation and we also discuss the mapping of the depth from scene to displayed image. The approach to solve the problem in stereoscopic image which we adopt in this paper is similar to multi-region algorithm which was proposed by N.Holliman. The main difference thing in our algorithm compared with the N.Holliman's multi-region algorithm is that we use the Laplacian equation by considering the distance between viewer and object. We implement the real time stereoscopic image generation method for OpenGL on the circular polarized LCD screen to demonstrate its real functioning in the visual sensory system in human brain. Even though we make and use artificial objects by using OpenGL to simulate the proposed algorithm we assure that this technology may be applied to stereoscopic camera system not only for personal computer system but also for public broad cast system.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2001.11b
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• pp.91-94
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• 2001

MPEG-4 시스템은 장면 자체를 하나의 구성 요소로 여기는 기존의 시스템과는 달리, 그 장면을 구성하는 부호화 또는 복호화된 A/V 객체(Audio/visual Objects)들을 하나의 단위로 인식하여, 다양한 멀티미디어 컨텐츠의 장면을 구성(Scene Composition)하고 표현 하는 것에 그 특징이 있다. 이러한 MPEG-4 시스템의 객체 기반 특징은 다양한 사용자와의 대화성(Interactivity)을 가능하게 하며 , 또한 편리한 컨텐츠 편집 및 재사용 등이 가능하기에 차세대 디지털 방송 컨텐츠 제작에 중요하게 활용될 전망이다. 객체 기반 A/V 편집 도구는 MPEG-4를 기반으로 차세대 디지털 방송 컨텐츠 제작을 용이하게 하기 위한 제작/편집 도구로써 , 장면을 표현하기 위하여 BIFS(Binary Format for Scene description)와 XMT(eXtensible MPEG-4 Textual format) 포맷을 모두 사용하고 있다. BIFS 포맷은 저작된 결과물을 바이너리 형태로 표현하기 때문에, 저작된 결과물을 전송하는 데에는 용이하나, 중간에 저작된 결과물을 확인하기 어렵고, 또한 기존의 다른 어플리케이션과의 상호 작용(Interoperability)과 교환(Exchange)에도 어려움이 따른다. 이에 반해, XMT는 차세대 마크업 언어로 각광 받고 있는 XML 에 그 기반을 두고 있기에 저작된 결과물을 제작자가 쉽게 저작물을 이해할 수 있으며, SMIL 과 X3D 같은 다른 어플리케이션과의 상호작용과 교환 또한 용이하게 한다 XMT는 기술 방법에 따라 XMT-A 와 XMT-0 두 가지 형태가 있으며, XMT-A 포맷은 VRML에서 발전한 X3D(extensible 3D)를 바탕으로 MPEG-4 시스템의 특징들을 수용하여 구성되고 BIFS와 일대일로 대응된다. 반면에 XMT-0는 멀티미디어 문서를 웹문서로 표현하는 SMIL 2.0 을 그 기반으로 하였기에 MPEG-4 시스템의 특징보다는 컨텐츠를 저작하는 제작자의 초점에 맞추어 개발된 형태이다. XMT를 이용하여 컨텐츠를 저작하기 위해서는 사용자 인터페이스를 통해 입력되는 저작 정보들을 손쉽게 저장하고 조작할 수 있으며, 또한 XMT 파일 형태로 출력하기 위한 API 가 필요하다. 이에, 본 논문에서는 XMT 형태의 중간 자료형으로의 저장 및 조작을 위하여 XML 에서 표준 인터페이스로 사용하고 있는 DOM(Document Object Model)을 기반으로 하여 XMT 문법에 적합하게 API를 정의하였으며, 또한, XMT 파일을 생성하기 위한 API를 구현하였다. 본 논문에서 제공된 API는 객체기반 제작/편집 도구에 응용되어 다양한 멀티미디어 컨텐츠 제작에 사용되었다.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.31 no.2
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• pp.159-164
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• 2013

It is well known that a single moving camera video is capable of extracting the 3-dimensional position of an object. With this in mind, current research performed image-based monitoring to establish a floating structure model using a camcorder system. Following this, the present study extracted frame images from digital camcorder video clips and matched the interest points to obtain relative 3D coordinates for both regular and irregular wave conditions. Then, the researchers evaluated the transformation accuracy of the modified SURF-based matching and image-based displacement estimation of the floating structure model in regular wave condition. For the regular wave condition, the wave generator's setting value was 3.0 sec and the cycle of the image-based displacement result was 2.993 sec. Taking into account mechanical error, these values can be considered as very similar. In terms of visual inspection, the researchers observed the shape of a regular wave in the 3-dimensional and 1-dimensional figures through the projection on X Y Z axis. In conclusion, it was possible to calculate the displacement of a floating structure module in near real-time using an average digital camcorder with 30fps video.

• Korean Institute of Interior Design Journal
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• no.25
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• pp.94-102
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• 2000

The line of demarcation separating architecture from the art in recent years has blurred, due to the expantionist aspects between. This is a study of the direction which contemporary architecture and art are now taking. The results of the study are as follows: 1. The direction of contemporary architecture is revealed through the works of deconstructivist architects and Hans Hollein. Deconstructivist architects have incooperated abstract forms and concepts for their expression. Also Hans Hollein has brought a new aspect to architecture by combining the aura of spirituality and the use of collage. 2. The direction of contemporary art is revealed through the works of installation artists. Daniel Buren works on the interactivity between the object and the observer. Dan Graham deals with the social issues which caused by the interrelation between the eyes and the visual media. Jae-en Choi works on the actual architectural site and space capturing the spirit of what the space is for shile Jung-hwa Jung deals with the layers of perception within a particular space. Another realm coming into being is the cooperation between artists and architects. The cooperation of Holl and Acconci is expressed through their joint project Storefront Gallery. It is the development of Accocis concept of boundary and Holls methodology. Another example of this realm is revealed through the Fish Gallery of the Guggenheim Museum Bilbao. Gehry was introduced to the nature of material by Serra and Serra learned of new ways of viewing the existence of space between materials from Gehry. These new relationships between contemporary architecture and art are reciprocal in nature are indicators of a dynamic and new changing cooperation now emerging.

• Journal of KIISE:Software and Applications
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• v.37 no.8
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• pp.611-619
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• 2010

This paper presents an efficient modeling system of virtual pottery in which the user can deform a body of virtual clay with a haptic tool for E-learning. We propose a Circular Sector Element Method (CSEM) which represents the virtual pottery with a set of circular sector elements based on the cylindrical symmetry of pottery. Efficient algorithms for collision detection and response, interactions between adjacent elements, and GPU-based visual-haptic synchronization are designed and implemented for the CSEM. Empirical evaluation showed that the modeling system is computationally efficient with finer details and provides convincing model deformation and force feedback. The developed system, if combined with educational contents, is expected to be used as an effective E-learning platform for elementary school students.