• 한국정보통신학회논문지
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• 제13권9호
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• pp.1787-1794
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• 2009

본 논문에서는 거실에서의 가족이 즐길 수 있는 IPTV 게임에 활용될 수 있으며, 유년기 자녀들의 게임 중독을 막을 수 있는 텐저블 전자 주사위 인터페이스를 제안한다. 제안된 텐저블 전자 주사위 인터페이스는 실제 주사위와 가능한 유사하게 설계되어 직접적이고 직관적인 조작으로 사용자들이 사용할 수 있도록 하였다. 제안된 인터페이스는 외부 장치를 필요로 하지 않는 자립식(self-contained) 장치이다. 실험을 통해 제안된 주사위 인터페이스가 PC나 IPTV 환경에서 동작하는 게임에 효과적으로 적용될 수 있음을 확인할 수 있다. 앞으로 이 장치를 현재 개발중인 IPTV 게임 등에 적용하여 실용성을 검증할 예정이다.

• 한국컴퓨터그래픽스학회논문지
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• 제17권1호
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• pp.1-7
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• 2011

본 논문에서는 2-변수 모션 (two-parameter motion)을 이용한 새로운 스윕곡면의 생성 및 편집기법을 제시한다. 먼저, 하나의 변수로 매개화되는 기존의 모션에서 방향곡선 (orientation curve)과 크기 변환곡선 (scaling curve)을 곡면의 형태로 확장한 2-변수 모션의 개념을 소개하고, 이를 이용한 새로운 스윕곡면을 제안한다. 제안된 스윕곡면은 하나의 정점이 2-변수 모션에 적용된 결과이며, u-방향의 등위곡선 (iso-curve)이 매개변수 ${\upsilon}$에 따라 다른 형상을 갖게된다. 또한 이에 대한 효율적인 모델링 및 편집기법은 2-변수모션의 직관적인 제어를 통해서 이루이진다. 본 논문에서는 복잡한 형상에 대한 모델링 및 편집 실험을 통해서 제안된 기법의 효율성 및 편리성을 입증한다.

• Archives of Plastic Surgery
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• 제34권6호
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• pp.785-791
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• 2007

Purpose: Paraffin has been used to augment depressed nasal contour for many years by illegally. Reported complications of nasal paraffinoma were skin thinning, displacement of nasal profile, redness, chronic inflammation and malignant change to skin cancer. The current authors report results of the secondary rhinoplasty after excision of nasal paraffinoma. Methods: Through the open rhinoplasty incision, paraffinoma was removed under direct vision. Saline irrigation and meticulous hemostasis were performed. Simultaneously, the secondary depressed nasal deformity was corrected with autogenous dermofat graft harvested from inferior gluteal fold. The dermofat was fixed to the nasofrontal area with bolster suture, and the interdormal area of the tip. Results: A total of 13 patients underwent secondary augmentation with autogenous dermofat graft after removal of paraffinoma from 2000 to 2004. The mean follow-up period was 15 months. There were no postoperative complications. All patients were satisfied with their surgical results. However, there were 10 to 20 percent resorption of the grafted dermofat. Conclusion: It is suggest that autogenous dermofat be one of good materials for the correction of the secondary deformity after removal of nasal paraffinoma. In addition, autogenous dermofat graft presented easy harvesting and manipulation for transfer, high survival rate by firm fixation to the recipient site and stable surgical results.

• Plant Biotechnology Reports
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• 제4권3호
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• pp.229-235
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• 2010

In this study, we established an in vitro regeneration system to maximize the recovery of leafy perilla (Perilla frutescens L. Britton) plantlets as part of developing a molecular biotechnology-based metabolic engineering program for this crop plant. Hypocotyl segments including the apical buds were used as explants for the direct production of shoots without an interim callus phase. The number of shoots produced from the apical buds peaked within 3-4 weeks, and the shoots were subsequently cultured on Murashige and Skoog (MS) media supplemented with 2 mg $1^{-1}$ benzylaminopurine (BA). Spontaneous rhizogenesis was observed after 7-10 days of culture on MS media without hormonal additives. The rooted shoots developed into normal plants in soil after hardening on distilled water for 3-4 days. The average plantlet regeneration frequency was higher for the apical buds (64.33%) than for the top (15.66%), middle (4%), and basal (1.33%) segments of the hypocotyls. This regeneration system demonstrates a capacity for high-frequency plantlet recovery and thus should be considered for use in the genetic manipulation of leafy perilla.

• 한국CDE학회논문집
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• 제10권2호
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• pp.114-120
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• 2005

This paper presents a novel method for radius measurement of fillet regions of polygonal models by using optimum onhogonal planes. The objective function for finding an optimum onhogonal plane is designed based on the orthogonality between the normal vectors of the faces in a filet region and the plane that is to be found. Direct search methods are employed to solve the defined optimization problem since no explicit derivatives of the object function can be calculated. Once an optimum orthogonal plane is obtained, the intersection between the onhogonal plane and the faces of interest is calculated, and necessary point data in the fillet region for measuring radii are extracted by some manipulation. Then, the radius of the fillet region in question is measured by least squares fitting of a circle to the extracted point data. The proposed radius measuring method could eliminate the burden of defining a plane for radius measurement, and automatically find a necessary optimum orthogonal plane. It has an advantage in that it can measure fillet radii without prior complicated segmentation of fillet regions and explicit information of neighboring surfaces. The proposed method is demonstrated trough some mea-surement examples.

• 생명과학회지
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• 제11권3호
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• pp.259-265
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• 2001

Mercury vapor inhalation-induced acute respiratory failure(ARF) has been reported to be fatal. This study was designed to observe the possible mechanism of inhaled mercury vapor poisoning in the respiratory system. Sixty percent of rats(12/20) exposed to mercury vapor were dead within 72 hours of exposure whereas all the rats(20/20) exposed to mercury vapor combined with dithiothreitol(DTT) vapor survived. The histological observation showed that ARF was a direct cause of the death induced by mercury vapor inhalation, which was significantly circumvented by DTT vapor. Cyclic AMP mediated chloride secretion was inhibited by luminal side but not serosal side sulfhydryl blocking agents (Hf$^{2+}$ $\rho$-chloromercuribenzoic acid or $\rho$-chloromercuriphenyl sulfonic acid) in a dose-dependent manner in a primary cultured rat airway monolayer. The inhibitory component of cAMP induced chloride secretion was completely restored by luminal side DTT(0.5mM). these results suggest that the oxidized form(Hg$^{2+}$) of mercury vapor(Hg0) contribute to ARF and subsequent death. The finding is important as it can provide important information regarding emergency manipulation of ARF patients suffering from by mercury vapor poisoning.ing.

• 한국태양에너지학회 논문집
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• 제31권6호
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• pp.132-138
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• 2011

Inducing the natural lighting into building has been commonly applied to the spaces where artistic objects are displayed to create better visual environment for the appreciation. The direct natural lighting, especially through top lighting system may, however, bring forth discoloing of highly light-sensitive materials such as paintings or demanding additional cooling load. In addition, it causes to create glare against appreciators or to yield in visual distraction due to the extreme contrast on the inner surfaces of the spaces. Shading device such as louver is capable of preventing such voidable cases with careful manipulation. This study aims to provide basic design guide-line when the flat-form louver has to be applied to top lighting system. Interaction between the daylight and louver was simulated by Reluxpro program with variation of the attachment location, the angle of the lover, surface reflectivity, to obtain the illumination of the floor surface. This study yields the louver just under the top lighting window with 90 degree angle gives the most desirable way of employment when the uniform illumination on the floor surface is required.

• 한국멀티미디어학회논문지
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• 제13권11호
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• pp.1715-1727
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• 2010

인간의 손은 현실의 사물과 인터랙션하는 가장 직접적이고 자연스러운 인터페이스라고 할 수 있으나, 가상 환경에서는 인간 손 관절체의 높은 자유도와 관련 인터페이스 장치의 한계로 말미암아 가상현실 애플리케이션에 활발히 도입되고 있지 못한 상황이다. 특히, 가상 조립 시뮬레이션은 제품 개발 단계에서 디지털 목업의 검증을 위한 프로세스로서 가상현실 애플리케이션 중 도전적인 주제라고 할 수 있다. 하지만, 가상의 객체를 파지(grasp)하기 어렵고 지속적으로 세밀하게 조작 할 수 없는 점 등은 핸드 햅틱 인터랙션이 가상 조립 등의 가상현실 애플리케이션에 적용 시 커다란 장벽으로 인식되고 있다. 본 논문에서는 핸드 햅틱 인터랙션을 두 관점에서 분석하여 각 단계별로 단계적 절차를 수행하는 방법을 제안하고자 한다. 인간이 사물을 쥐고 조작할 때, 손 안에서 사물이 빠져나가지 않도록 사물의 외형에 따라 손의 힘의 균형을 조절하는 견고함과 일단 사물을 쥐게 되면 손 안에서 인간의 의도를 반영한 정밀한 사물 조작이 가능한 세밀성이 가능한 핸드 햅틱 인터랙션을 제안하고자 한다. 제안된 알고리즘은 초기 grasp를 용이하게 하기 위해 품질평가척도를 통해 grasp의 견고함을 확보하고, 세밀한 조작성을 확보하기 위해 물리 기반의 시뮬레이션을 수행한다. 제안된 방법의 효율성을 평가하기 위하여 서로 다른 디스플레이 환경-모노, 입체 디스플레이-에서 실험을 수행하였다. 그리고 2-way ANOVA 테스트를 통하여 본 연구에서 제안한 충돌 전 grasp 단계와 충돌 후 조작 단계로 구분된 알고리즘이 앞서 언급한 두 관점을 모두 만족함을 보였다. 마지막으로, 제안된 인터랙션 방법을 이용하여 복잡한 그래픽 모델에 관한 가상 조립 시뮬레이션에 적용된 실 사례를 보였다.

• 대한기계학회논문집A
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• 제36권5호
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• pp.475-479
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• 2012

본 논문은 고차가지구조 폴리머인 AEO3000 를 이용한 UV 광경화 성형 공정을 제안하고자 한다. 이는 기존의 바이오칩 제작에 사용되는 PDMS 보다 경도가 높아 금속 전극 형성이 용이하고 제작 공정이 빠르다는 장점을 갖는다. AEO3000 을 이용하여 본 연구에서는 4 개의 소자를 전기적 유체적으로 연결할 수 있는 전기유체 통합벤치를 제작하고 미소유체 혼합소자와 세포분리소자를 연결, 본 소재와 공정이 바이오칩에 적용될 수 있음을 검증하였다. 전기 유체적 특성 분석 결과 전기적 접촉 저항은 $0.75{\pm}0.44{\Omega}$으로 충분히 작은 값을 보였으며, 유체 접속의 압력 저하는 8.3kPa로 기존의 튜브 연결 방법 대비 39.3% 개선된 값을 보였다. 통합벤치에 접속된 소자에 활성 및 비활성 효모를 주입하여 순차적인 혼합 및 재분리를 성공적으로 구현함으로써 본 소자에 적용된 AEO3000 및 UV 광경화 공정이 생체시료의 처리에 적용될 수 있음을 실험적으로 검증하였다. 이는 바이오 의료 분야에 적용 가능한 생체 친화적 소재의 고속 생산에 응용될 수 있다.

• 한국초등과학교육학회지:초등과학교육
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• 제40권1호
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• pp.22-35
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• 2021

In order to investigate the trends in science education research using AR (Augmented Reality) and derive implications for elementary science education, we analyzed 71 research articles on AR application in science education published in both Korea and abroad from 2010 to August 2020. In quantitative aspects, the number of published articles has steadily increased. For domestic researches, the number of papers targeting for elementary school students was higher than that of middle & high school students. In the research method aspects, qualitative methods were most frequently used. In particular, papers regarding the development of AR program and verification of its effectiveness were most frequently published. The researches using mixed method in domestic field were smaller in number than that of the research in abroad. There were similar trends in research targeting elementary school students. In the aspects of the contents, more researches were performed on biology and earth science areas than others. In case of researches for elementary school students, the proportion of researches on biology and earth science was even higher. Domestically the proportion of studies on the convergence of science and non-science subjects was higher than that of foreign studies. The number of researches exploring the effectiveness on 'non-scientific attitude domain', 'cognitive domain', and 'program domain' were relatively higher than that on 'inquiry & practice domain' and 'science-related attitude domain'. For types of AR contents, 'observation manipulation type' was mostly studied, followed by 'experimental activity type', and 'learning guide type'. In case of studies on elementary school students, the ratio of 'observation manipulation type' contents was higher than that of others, whereas studies on 'field problem solving type' were relatively less reported than others. In addition, studies on 'simple interaction' were most frequently reported. Particularly, there were relatively few studies on 'linear and nonlinear interactions' in domestic field. As a result of analyzing key words, we found that the key words related to the characteristics and implementation of AR frequently occurred, and the key words related to elementary education and the merits of AR had many direct connections with other key words.