• Journal of the Korean Society for Precision Engineering
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• v.32 no.1
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• pp.97-105
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• 2015

Recently, there have been many researches about applications of origami to mechanical engineering, which realizes a 30 sturcture by folding a 20 plane material. With this simple manufacturing process, origami was even adopted by some roboticists as a way to build an entirely new robot with benefits in terms of cost, weight, and structural simplicity In this paper, we propose a new type of a walking robot based on origami structure. Because all the components of the robot that generate gait motion are mechanically connected, it can actually walk fotward with only a single actuator. We also showed the similarity of gait trajectories between a kinematic analysis and the actual gait motion measured by video tracking. This result proved the possibility of designing an origami-based robot with the identical gait trajectory as we plan.

• Communications of Mathematical Education
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• v.13 no.2
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• pp.457-475
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• 2002

수학사를 통해 볼 때 눈금 없는 자와 컴퍼스를 이용한 작도 가능성의 문제는 여러 면에서 의미가 있었다. 종이 접기는 수학과는 무관하게 나름대로 많은 흥미를 끌어 왔다. 그러나 종이 접기가 기하학적 작도와 흥미 있는 관련이 있음이 알려지면서 수학적으로도 연구되었고 더 나아가 수학 학습에의 유의미한 활용 가능성이 제안되었다. 본 글에서는 종이 접기에서 괄목할 만한 수학적 성질을 고전적인 작도 가능성의 문제와 다항식의 거듭 제곱근에 의한 가해성 등과 관련하여 고찰한다. 또, 초 ${\cdot}$ 중등 학교에서 활용 가능한 가상의 수업 프로토콜도 제시한다.

• The Mathematical Education
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• v.41 no.1
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• pp.79-90
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• 2002

In this article we study on connecting paper 131ding activities of triangle with mathematical proof Folding median, bisector of angle, and hight of paper triangle, we from and extract some ideas that help us to proof some important theorems of plane geometry. In this study using formed ideas in the process of paper folding activities, we suggest some interesting new mathematical proofs of the following theorems: 1. three medians of triangle are intersect in a point; 2. three bisectors of interior angles of triangle are intersect in a point; 3. three heights of triangle are intersect in a point.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.44 no.3
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• pp.228-239
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• 2016

CNUSAIL-1 is a 3U-sized cube satellite with $4m^2$ small solar sail which is currently being developed at the Chungnam National University. The primary purpose of the CNUSAIL-1 is successful sail deployment in LEO and its operation for investigating its effect on satellite orbit and attitude as well as performing de-orbiting using the sail membranes as drag sail at the final phase. The system design and mechanism of solar sail deployment is introduced, and optical and tensile tests are carried out for the material of membranes and booms for its safety and performance verification. The ground test is carried out to verify its performance for sail deployment and satellite through comparison between folding methods by determining its folding patterns, thickness of spiral spring and angular velocity measurement in a low-friction environment.

• Food Science of Animal Resources
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• v.26 no.4
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• pp.431-440
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• 2006

This study was carried out to compare of yield, physico-chemical and sensory characteristics for chicken surimi manufactured by alkaline (pH 11) adjustment with different raw materials. Four experimental groups were surimi with chicken breast (T1) and chicken leg (T2) by spent hen, SF-MDCM (T3) and JY-MDCM (T4). Yield was higher in order of T1>T2>T3>T4 (p<0.05). The yield, physico-chemical and sensory characteristics of T1 were significantly higher than those of other treatments. Especially, $L^*$ and W value, shear force, textural properties, folding test, breaking force, gel strength, breaking $force{\times}deformation$, flavor, color and overall acceptability were higher in T1 but ar value, cooking loss, collagen and myoglobin content of T1 were lower than those of other treatments (p<0.05). Deformation, aroma, juiciness, tenderness were higher but met-myoglobin and yield of T4 were lower than those of T2 and T3 (p<0.05). Crude fat cooking loss and met-myoglobin content were higher in T2 but $b^*$ value, brittleness, hardness, gumminess, chewiness, folding test, breaking $force{\times}deformation$ and aroma of T2 were lower than those of other treatments (p<0.05). pH, collagen and moisture content and br value were higher but crude protein, folding test, $L^*$ and W value, cohesiveness, tenderness of T3 were lower than those of other treatmene (p<0.05). Correlation coefficients (r>0.8) between folding test and other items was positive in crude protein $L^*$ value, shear force and cohesiveness but negative in moisture content (p<0.05).

• Korean Journal of Human Ecology
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• v.22 no.2
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• pp.357-363
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• 2013

The purpose of this study is to suggest a new method to develop the apparel design applied construction of traditional swimsuit wearing Jeju woman divers known as Haenyeo. Jeju Haenyeos are represented as an image of the diligent and strong woman. With such an image, they have become the symbol of Jeju women. Furthermore, Jeju Haeyeo culture will be rebranded. The Jeju woman divers wear special swimsuit (Mul-sojungii) when harvesting the various sea products. The Mul-sojungii was buttoned down the right side so that it could be easily removed. Therefore, it is to review the fashion design products for effective item applied the original or modified folding technique of Mul-sojungii. As a result, it was to develop the bolero, jump suit and dress design of Korean image using folding technique(Guljapgi) of Mul-sojungii that is one of the unique, indigenous construction of Jeju.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1997.10a
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• pp.684-688
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• 1997

The human species has been able to fly for about a century - with the help of aircraft of various kinds. Recently. air vehicles which are like an insect or a bird with flapping wings have been appeared, although many of them are experimental flight vehicle. However, the rubber-powered flapping vehicle is put to practical use such as toy, which flies for some seconds. In this paper, we analyze and evaluate above the rubber-powered flight vehicle using axiomatic design and will present new four flapping wing model.

• Communications of Mathematical Education
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• v.20 no.3 s.27
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• pp.469-482
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• 2006

It ill give much interest both to the teacher and student that paper crane makes interesting mathematical investment possible. It is really possible for the middle school students to invest mathematical activity such as the things about triangle and square, resemblance, Pythagorean theorem. I reserched how this mathematical investment possible through folding and unfolding paper crane and analyzed the mathematical meaning.

• Journal of Gifted/Talented Education
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• v.20 no.2
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• pp.461-486
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• 2010

By learning math, constructing math problems helps us to improve analytical thinking ability and have a positive attitude and competency towards math leaning. Especially, gifted students should create math problems under certain circumstances beyond the level of solving given math problems. In this study, I examined the math problems made by the gifted students after the process of raising questions and discussing them for themselves by doing origami. I intended to get suggestions by analyzing of problem posing strategy and method facilitating the thinking of mathematics gifted students in an origami program.

• Proceedings of the Korean Institute of Interior Design Conference
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• 2007.11a
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• pp.118-121
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• 2007

Modem society has been complicated and diverse, and then various paradigms coexist. We can see Postmodernism moving in the flows of modern architecture. Therefore looming large is the Fold architecture that can surmount the limit of design in Postmodernism and Deconstruction and suits to the modern culture as an architectural alternative. So I believe this research can make us perceive the streams of modern interior space by considering the features and meanings of Fold conception which has been noticeable in the overall architecture and culture since the middle of 1990's with analyzing and defining atypical organic Fold characteristics appearing in modern interior since 2000, and also predict the next changing direction.