• Korean Journal of Acupuncture
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• 제25권2호
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• pp.225-232
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• 2008

Objectives : The aim of this study is to investigate the possibility of acupuncture to influence thyroglossal cyst. Methods : Acupuncture treatment was applied on several acupoints in the afternoon three to four times a week for 12 weeks. The effect of acupuncture treatment was evaluated with Visual Analogue Scale(VAS) and THYROID USG manipulated by a specialist in radiology. Results : VAS was decreased from 10 to 2, and this effect occurred in the first half of the treatment period. THYROID USG scan has shown that acupuncture treatment reduced the depth of the cyst approximately 6 ㎜ in the first half of the period, but not in the latter half. Conclusions : From this study, we suggest that acupuncture may take part in the treatment of thyroglossal cyst.

• 대한조선학회지
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• 제5권1호
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• pp.1-7
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• 1968

In this problem the ragid punch in the form of a flat-ended circular cylinder of unit radius is cemented to the stress free surface of an elastic half-space. An axial load P is then applied to the punch to force it into half-space to depth $\varepsilon$. It is assumed that the adhesive between the punch and can be reduced to the system of Abel type integral equations which are equation (13) and (14). It is also shown that the stress and displacement components on the portions of boundary where they are not prescribed can be expressed in terms of $\phi(t)$ and/or $\phi(t)$ which are introduced in equation (9) and (10). Those functions can be obtained from the solution of the system of integral equations (13) and (14).

• 한국진공학회:학술대회논문집
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• 한국진공학회 2013년도 제45회 하계 정기학술대회 초록집
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• pp.274.1-274.1
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• 2013

We report the circumferential alignment of human aortic smooth muscle cells (HASMCs) in an orthogonally micropatterned circular microfluidic channel to form an in vivo-like smooth muscle cell layer. To realize a biomimetic smooth muscle cell layer which is aligned perpendicular to the axis of blood vessel, we first fabricated a half-circular polydimethylsiloxane (PDMS) microchannel by soft lithography using a convex PDMS mold. The orthogonally micro wrinkle patterns were generated inside the half-circular microchannel by stretching-releasing operation under UV irradiation. Upon UV treatment with uniaxial 40 % stretch of a PDMS substrate and releasing process, the microwrinkle patterns perpendicular to the axial direction of the circular microchannel were generated, which could guide the circumferential alignment of HASMCs successfully during cultivation. The analysis of orientation angle, shape index, and contractile protein marker expression indicates that the cultured HASMCs revealed the in vivo-like cell phenotype. Finally, we produced circular microchannels by bonding two half-circular microchannels, and cultured the HASMCs circumferentially with high alignment and viability for 5 days. These results are the first demonstration for constructing an in vivo-like 3D smooth muscle cell layer in the circular microfluidic channel which can provide novel bioassay platforms for in-depth study of HASMC biology and vascular function.

• International Journal of Internet, Broadcasting and Communication
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• 제15권2호
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• pp.181-186
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• 2023

With the development of VR technology, the visual immersion of VR games has been greatly enhanced nowadays. There has been an issue that has been troubling players in previous VR games, which is motion sickness. Therefore, VR games have been limited in terms of game mechanics, game duration, and game scale, greatly reducing the immersive experience of visual immersion. However, <Half-Life: Alyx> is different from previous VR games in that players can actually perform spatial displacement in the game scene, rather than being fixed in one place for 360-degree observation and interaction. At the same time, compared to traditional games, VR games no longer need to rely on screens, and the complete visual immersion enhances the fun and playability of the game. This research focuses on the VR game <Half-Life: Alyx> to explore its immersive factors in terms of visual perception. Through in-depth analysis of elements such as color, texture mapping, lighting, etc. in VR games, it was found that the game creates a strong sense of visual immersion in these aspects. Through analysis, it is helpful to gain a deeper understanding of the factors that contribute to visual immersion in VR games, which has certain reference value for game developers and related professionals.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 1996년도 가을 학술발표회 논문집
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• pp.202-209
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• 1996

In this paper, two dimensional vertical and comer infinite elements which can include multiple wave components to model underlying half space are developed. These elements are natural and economical to model underlying stiff half space or rock. To verify the behavior of these infinite elements, vertical, horizontal, and rocking compliances of a rigid strip foundation on a viscoelastic soil profile are analyzed and compared with those of Tzong and Penzien who used the boundary solution method. Good agreements are noticed between the two methods. The influence of material properties like Poisson's ratio, material damping, and stiffness ratio of layers as well as the influence of geometrical properties such as layer thicknesses and depth of foundation embedment are studied. Example analysis is carried out for the shaking table which is located in KIMM(Korea Institute of Machinery and Materials), and the vertical and horizontal displacements of the analysis are compared with the measured, and show good results and demonstrate the efficiency of the proposed method.

• 대한가정학회지
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• 제37권9호
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• pp.57-71
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• 1999

This study was intended to find the body pattern of the middle-aged women and to make new experimental basic pattern for upper-half of the body for them. To analyze the body pattern of middle-aged women, the methodologies of measurement of the individual part of the body, group aged-analysis, Rohrer Index, Vervaeck Index, factor analysis, discriminant analysis, cluster analysis and girth index were used. The comparison of the twentieth to the thirtieth, the fortieth and the fiftieth showed bigger change in the thirtieth and the biggest change in the fortieth in girth. The fiftieth showed thick body pattern by increasing the depth but decreasing the girth. Body types were divided into three groups, thin, standard and fatty troupes by Rohrer index. With Rohrer Index, there was no difference for back length in three groups, but girth showed shorter in thin and standard groups but longer in fatty group.

• Interaction and multiscale mechanics
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• 제6권1호
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• pp.1-14
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• 2013

The aim of this paper is to study the propagation of torsional surface waves in non-homogeneous isotropic layer of finite thickness placed over a homogeneous viscoelastic half-space, when both density and rigidity of the non-homogeneous medium are assumed to vary exponentially with depth. The frequency equations are obtained by using simple method of separation of variables. Further, it is seen that when viscoelastic parameter and non-homogeneity parameter is neglected, the dispersion equation gives the dispersion equations of Love waves in homogeneous, elastic and isotropic layer placed over homogeneous viscoelastic medium. The problem has been solved numerically and the effects of various inhomogeneities of the medium on torsional waves have been illustrated graphically.

• 한국염색가공학회지
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• 제9권2호
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• pp.50-56
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• 1997

Poly(ethylene terephthalate) (PET) has been etched by sputtering in the presence of argon gas and the resulting surface modifications investigated via weight loss, time of water permeation, half value period, scanning electron microscope(SEM) and color difference measurements. According to increasing sputter etching time, weight loss increased, the time of water permeation and half value period of the sputter etched PET fabrics decreased. Color depth of fabrics increased by increasing sputter etching time. We investigated the fabric surface modification by SEM. Many microcraters on the fabric surface formed by the sputter etching resulted in increase of surface area of the fabric and wettability.

• 한국HCI학회논문지
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• 제8권2호
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• pp.21-27
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• 2013

최근 플로팅 방식의 홀로그램이 전시, 교육, 광고 등에 많이 활용되고 있다. 그중에 하프 미러 방식은 플로팅 홀로그램 중 가장 널리 쓰이는 방식 중 하나이다. 하지만 하프 미러 방식은 완벽한 3차원 홀로그램의 경험을 주지는 못한다. 이미지가 공중에 떠 있는 것처럼 보이기는 하나, 홀로그램의 궁극적 목표인 공간상에 가상 이미지를 표현하지는 못한다. 더욱이 하프 미러 후면에 실제 오브젝트를 두고 가상의 이미지와 결합하여 함께 보여주고자 할 때, 두 객체가 공간상에서 불일치되는 현상이 발생한다. 본 논문에서는 스테레오 증강현실 홀로그래피에서의 삼차원 공간감 비교를 위한 연구를 진행하였다. 3차원 공간에서의 정확하고 효율적인 증강현실 구현을 위하여 하프 미러 기반 홀로그래픽 시스템에 입체 영상기법을 적용하였다. 이는 하프 미러 필름 후면에 위치한 실제 오브젝트와 하프 미러를 통해 반사된 가상 이미지가 같은 공간상에 함께 어우러져 있는 것처럼 표현할 수 있다. 또한, 뎁스 카메라를 사용하여 사용자의 움직임에 맞게 가상 카메라를 조절함으로써 자연스러운 패러럭스 표현이 가능하도록 하였다. 본 연구에서 제안하는 방법은 별도의 추가 장치 없이, 단지 하프 미러 필름을 통해서 비교적 간단하고 정확하게 실제 객체의 위치와 같은 공간상에 증강된 시각 정보를 표현한다. 제안한 증강현실 홀로그래피에서의 삼차원 공간감에 대해 비교 실험을 한 결과, 2D 이미지를 적용한 경우 보다 3D 이미지 혹은, 3D 이미지와 사용자 인터랙션을 함께 적용한 경우, 사용자에게 3차원 공간감, 현실감(realism)을 더 정확하고 효과적으로 제공할 수 있음을 확인하였다.

• 한국전자통신학회논문지
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• 제8권4호
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• pp.535-540
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• 2013

본 논문에서는 슬롯의 깊이를 변화시켜 X-밴드에서 동작하는 1.4m길이의 도파관 슬롯배열 안테나를 설계하였다. 54개의 슬롯배열이 모델링되어 CST로 시뮬레이션 되었으며 부엽레벨은 주어진 주파수 범위에서 효과적으로 억압되었다. 안테나의 측정 결과 이득은 21.8dB, 최대 부엽레벨은 -31dB, 반전력빔폭은 $2.0^{\circ}$의 결과를 얻을 수 있었다.