• 한국CDE학회논문집
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• 제21권2호
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• pp.122-129
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• 2016

4D printing is a method that manufactures a programmed transformable 3d printed components that can be transformed in a pre-designed environment. We propose a service-oriented web architecture for supporting 4D printing system. Service model is classified under four kinds of functions: design, sharing, application and production. We designed RESTful web APIs for these functions. Some preliminary designs about the web API architecture and data modeling is discussed.

• 한국정보과학회논문지:소프트웨어및응용
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• 제29권1_2호
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• pp.126-131
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• 2002

주어진 문법이 LL 언어를 생성하는가의 문제를 LL 변환 가능성의 관점에서 조사한다. LL 변환 가능 문법을 특징짓기 위해 기존의 방법은 비결정적인(nondeterministic) 복잡한 파서의 생성을 필요로 한다. 이에 기존 방법으로는 LL 언어의 본질에 대한 직관적인 이해가 어렵다. 이 단점을 극복하고자 본 논문에선 파서의 생성 없이 문법 자체의 분석을 통한 문법 유도(derivation)에 근거한 특징화를 제시한다. 새로운 특징화는 LL 언어의 본질에 대한 직관적인 이해를 도울 수 있다.

• 대한수학회지
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• 제59권2호
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• pp.367-377
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• 2022

Let G be a non-discrete locally compact abelian group, and 𝜇 be a transformable and translation bounded Radon measure on G. In this paper, we construct a Segal algebra S_𝜇(G) in L¹(G) such that the generalized Poisson summation formula for 𝜇 holds for all f ∈ S_𝜇(G), for all x ∈ G. For the definitions of transformable and translation bounded Radon measures and the generalized Poisson summation formula, we refer to L. Argabright and J. Gil de Lamadrid's monograph in 1974.

• Kyungpook Mathematical Journal
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• 제54권1호
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• pp.43-63
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• 2014

The range spaces of Fourier cosine and sine transforms on $L^1$([0, ${\infty}$)) are characterized. Using Fourier cosine and sine type convolutions, Fourier cosine and sine transformable Boehmian spaces have been constructed, which properly contain $L^1$([0, ${\infty}$)). The Fourier cosine and sine transforms are extended to these Boehmian spaces consistently and their properties are established.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2001년도 ICCAS
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• pp.151.1-151
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• 2001

This paper establishes some integral equalities formulated by zeros located in the convergence region of Laplace transformable function. Using the definition of Laplace transform, it is shown that time-domain integral equalities have to be satisfied by the function, and those can be applied to understanding of the fundamental limitations of the control system represented by the transfer function, which has been Laplace transform. In the unity-feedback control scheme, another integral equality is also derived on the output response of the system with open-loop poles and zeros located in the convergence region.

• 한국정밀공학회지
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• 제29권2호
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• pp.178-184
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• 2012

This paper presents a transformable track mechanism for wall climbing robots. The proposed mechanism allows a wall climbing robot to go over obstacles by transforming the track shape, and also increases contact area between track and wall surface for safe attachment. The track mechanism is realized using a timing belt track with one driving actuator. The inner frame of the track consists of serially connected 5R-joints and 1P-joint, and all joints of the inner frame are passively operated by springs, so the mechanism does not require any actuators and complex control algorithms to change its shape. Static analysis is carried out to determine design parameters which enable $90^{\circ}$ wall-to-wall transition and driving over projected obstacles on wall surfaces. A Prototype is manufactured using the transformable track on which polymer magnets are installed for adhesion force. The size of the prototype is $628mm{\times}200mm{\times}150mm$ ($Length{\times}Width{\times}Height$) and weight is 4kgf. Experiments are performed to verify its climbing capability focusing on $90^{\circ}$ wall to wall transition and driving over projected obstacle.

• 한국지능시스템학회논문지
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• 제25권3호
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• pp.236-241
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• 2015

본 논문에서는 로봇 간의 결합과 허리 관절을 이용하여 변형 가능한 다 개체 4족 로봇 플랫폼을 제안하였다. 메카넘 휠을 적용하여 다양한 각도로 주행이 가능하고, 주행으로는 이동할 수 없는 환경을 극복하기 위해 보행도 가능한 복합 이동형 로봇으로 설계하였다. 주행 및 보행을 구현하기 위해 2가지의 기구학을 사용하였으며, 보행은 일정한 패턴을 생성하여 구현하였다. 로봇의 전면부와 후면부에는 결합 모듈을 장착하였고, 두 로봇 간의 결합을 위해 결합 알고리즘을 제시하고 실험하였다. 변형을 위해 로봇의 몸 중간에 허리 관절을 적용하였고, 허리 관절을 이용한 변형을 통해 물건을 옮길 수 있는 새로운 기능을 구현하였다.

• 디자인학연구
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• 제25권5호
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• pp.113-119
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• 2012

Under the paradigm of 'Eco', the core of sustainability management, this study aims to establish both domestic and international markets and secure competitiveness in the global markets through the development of children's furniture composed of recycled and unharmful materials. Currently, in Europe and in the Western regions, the concepts of 'eco-friendly', 'children', and 'DIY' are well-placed in the daily lives of the people. On the other hand, compared to the domestic demand for eco-friendly children's furniture, the essential approach and the qualitative improvements about the subject are being slowly progressed. Particularly, the process of applying eco-friendly materials and finishing materials to the children's furnitures are mostly in a non-existent state. Thus, in this study, simple application of basic eco-friendly materials such as natural woods or imitation of overseas furniture designs were avoided to create transformable eco-friendly one-touch DIY children's furniture for children's growth and development through the application of eco-friendly processes of technology, design, and other stages of the development process. In other words, under the big category of eco-friendly children's furniture, the furniture was developed through an environmentally-friendly process of universal design that is suitable for children of all ages, and thus, ultimately maximizing the economical effective value and reducing consumption of resources and environmental pollutions.

• 로봇학회논문지
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• 제4권4호
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• pp.265-272
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• 2009

IVarious driving mechanisms to adapt to uneven environment have been developed for many urban search and rescue (USAR) missions. A tracked mechanism has been widely used to maintain the stability of robot's pose and to produce large traction force on uneven terrain in this research area. However, it has a drawback of low energy efficiency due to friction force when rotating. Moreover, single tracked mechanism can be in trouble when the body gets caught with high projections, so the track doesn't contact on the ground. A transformable tracked mechanism is proposed to solve these problems. The mechanism is designed with several articulations surrounded by tracks, used to generate an attack angle when the robot comes near obstacles. The stair climbing ability of proposed robot was analyzed since stairs are one of the most difficult obstacles in USAR mission. Stair climbing process is divided into four separate static analysis phases. Design parameters are optimized according to geometric limitations from the static analysis. The proposed mechanism was produced from optimized design parameters, and demonstrated in artificially constructed uneven environment and the actual stairway.

• 제어로봇시스템학회논문지
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• 제4권1호
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• pp.1-9
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• 1998

This paper is focussed on the problem of robustly stabilizing a transformable linear time-varying system. The considered system is a class of state feedback transformable linear systems. First, the real linear time-varying system is transformed into the linear time invariant system composed with the time-invariant linear part and the time-varying uncertainty part. Second, the solution to a quadratic stabilization problem in the transformed linear system is give via' Lyapunov methods. Then this solution is used to construct a stabilizing linear control law for the real linear time-varying system.