• 대한토목학회논문집
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• 제33권1호
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• pp.35-46
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• 2013

본 연구에서는 모듈러 강교량 상부모듈 구성파트의 효율적인 3차원 조립설계를 위하여 BIM(Building Information Modeling)의 핵심기술 요소인 파라메트릭 모델링 방법을 연구하였다. 모듈러 강교량 상부모듈 구성파트의 3차원 조립설계를 위하여 모듈의 조립체계를 상세수준(LoD: Level of Details) 3단계로 정의하였다. 모듈을 구성하는 각 파트들의 3차원 형상구성을 위한 요소들을 추출하여 매개변수, 매개변수에 따라 변하는 종속변수, 매개변수에 따라 변하지 않는 고정 값으로 구분하여 정의하였으며, 조립체계 단계에 따라 파트간의 공간적 조립규칙을 정의하였다. 공간적 위치를 구속하기 위하여 3차원 형상구성 요소간의 위치관계를 정의하였으며, X, Y, Z 축에 대한 자유도를 구속하기 위하여 기하학적 관계를 정의하였다. 또한, 정의한 조립규칙을 적용하여 모듈러 강교량 상부모듈의 3차원 조립설계를 위한 표준템플릿을 구축하였으며, 정의한 매개변수의 변화에 따른 강교량 상부모듈의 형상변화 검토를 통하여 파라메트릭 모델링 방법의 적용성을 검증하였다.

• 한국지능시스템학회논문지
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• 제13권1호
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• pp.6-11
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• 2003

신경회로망은 최근 복잡하고 정형화가 어려운 문제의 해결을 위해 지능적인 기법이 제안되고 있다. 모듈라 네트워크는 복잡한 문제를 부문제로 나누어 해결한다. 퍼지 시스템은 복잡한 문제를 작은 부문제로 나누어 해결한다는 점에서 모듈라 네트워크와 유사하다. 하지만 퍼지 시스템의 경우에도 입력공간을 전문가가 직접 분할하고, 룰을 만들어야 한다는 단점이 있다. 이러한 단점을 해결하기 위해 퍼지 뉴럴 네트워크가 제안되었다. 하지만 입력의 증가에 따른 규칙수가 지수적으로 증가하는 문제점을 안고 있다. 본 논문에서는 이런 문제점을 계층적 구조를 설계함으로서 해결하였다. 또한, 제안된 구조는 앞선 모듈의 출력이 후건부에만 기여하는 구조를 사용하였다. 제안된 구조를 사용함으로써 입출력관계가 더욱 이해하기 쉬워졌으며, 설계의 어려움을 해결했다. 또한 룰이 수가 작다는 장점이 있다.

• 수완나부미
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• 제16권1호
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• pp.39-80
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• 2024

Guided by the prism of cultural studies, this paper takes a look at the Manila Korea Town in Malate, Manila. The location, Manila Korea Town, figures as the paper's object of study by exploring, theorizing, and reflecting on its presence and location within the horizon of the signifying powers of Korea-Philippine relations in the contemporary period. With the subject position of this essay, the paper theorizes by responding to the following questions: How does the meaning-making of South Korea fare with other Koreatowns in the world from the scale of Koreatown in Manila? Subsequently, what happens to a place when a global cultural phenomenon evolves into a form of placemaking in a different nation and territory? As Koreatown finally grounds itself in the anarchic lifeworld of Manila, what does this historical development in our urban lives reveal about our contemporary times? Responding to this set of questions led this paper to foreground the idea of a modular imagined community within a four-part discussion. The body of the essay begins by theorizing on the concept that this paper proposes, modular imagined community, and such a concept work draws from the theories of nationalism by Benedict Anderson and Partha Chatterjee. Subsequently, the antinomy between Anderson and Chatterjee is pursued by looking at the history of such a place, and through this step, the paper unravels the character of the place of Manila Korea Town, which explains the conditions of possibility of such social and communitarian formation. Yet as the public is caught by the presence of such development especially at the heart of Manila, the paper expands the scale and viewpoint by shining light on the globality of South Korea in relation to the Philippines. Lastly, this paper closes with a discussion on the food culture facilitated by this recent development, which also pushes us to imagine its potential, especially in light of the critique raised against South Korea and the popular culture associated with this phenomenon.

• 대한수학회논문집
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• 제23권4호
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• pp.461-468
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• 2008

We define an $\epsilon$-fuzzy congruence, which is a weakened fuzzy congruence, find the $\epsilon$-fuzzy congruence generated by the union of two $\epsilon$-fuzzy congruences on a semigroup, and characterize the $\epsilon$-fuzzy congruences generated by fuzzy relations on semigroups. We also show that the collection of all $\epsilon$-fuzzy congruences on a semigroup is a complete lattice and that the collection of $\epsilon$-fuzzy congruences under some conditions is a modular lattice.

• International Journal of Fuzzy Logic and Intelligent Systems
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• 제7권1호
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• pp.7-16
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• 2007

First, we investigate fuzzy equivalence relations on a set X in the sense of Youssef and Dib. Second, we discuss fuzzy congruences generated by a given fuzzy relation on a fuzzy groupoid. In particular, we obtain the characterizations of ${\rho}\;o\;{\sigma}{\in}$ FC(S) for any two fuzzy congruences ${\rho}\;and\;{\sigma}$ on a fuzzy groupoid ($S,{\odot}$). Finally, we study the lattice of fuzzy equivalence relations (congruences) on a fuzzy semigroup and give certain lattice theoretic properties.

• Geomechanics and Engineering
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• 제24권4호
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• pp.349-358
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• 2021

The Brazilian test has been widely used to determine the indirect tensile strength of rock, concrete and other brittle materials. The basic assumption for the calculation formula of Brazilian tensile strength is that the elastic moduli of rock are the same both in tension and compression. However, the fact is that the elastic moduli in tension and compression of most rocks are different. Thus, the formula of Brazilian tensile strength under the assumption of isotropy is unreasonable. In the present study, we conducted Brazilian tests on flat disk-shaped rock specimens and attached strain gauges at the center of the disc to measure the strains of rock. A tension-compression bi-modular model is proposed to interpret the data of the Brazilian test. The relations between the principal strains, principal stresses and the ratio of the compressive modulus to tensile modulus at the disc center are established. Thus, the tensile and compressive moduli as well as the correct tensile strength can be estimated simultaneously by the new formulas. It is found that the tensile and compressive moduli obtained using these formulas were in well agreement with the values obtained from the direct tension and compression tests. The formulas deduced from the Brazilian test based on the assumption of isotropy overestimated the tensile strength and tensile modulus and underestimated the compressive modulus. This work provides a new methodology to estimate tensile strength and moduli of rock simultaneously considering tension-compression bi-modularity.

• 충청수학회지
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• 제31권3호
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• pp.281-285
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• 2018

Let $S_k(N)$ be the space of cusp forms of weight k for ${\Gamma}_0(N)$. We show that $S_k(N)$ is the direct sum of subspaces $S_k^+(N)$ and $S_k^-(N)$. Where $S_k^+(N)$ is the vector space of cusp forms of weight k for the group ${\Gamma}_0^+(N)$ generated by ${\Gamma}_0(N)$ and $W_N$ and $S_k^-(N)$ is the subspace consisting of elements f in $S_k(N)$ satisfying $f{\mid}_kW_N=-f$. We find generators spanning the space $S_k^-(N)$ from $Poincar{\acute{e}}$ series and give all linear relations among such generators.

• Smart Structures and Systems
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• 제7권3호
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• pp.169-184
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• 2011

We review the current understanding of modularity in biological motor control and its forms, and then relate this modularity to proposed modular control structures for biomimetic robots. We note the features that are different between the robotic and the biological 'designs' with features which have evolved by natural selection, and note those aspects of biology which may be counter-intuitive or unique to the biological controls as we currently understand them. Biological modularity can be divided into kinematic modularity comprised of strokes and cycles: primitives approximating a range of optimization criteria, and execution modularity comprised of kinetic motor primitives: muscle synergies recruited by premotor drives which are most often pulsatile, and which have the biomechanical effect of instantiating a visco-elastic force-field in the limb. The relations of these identified biological elements to kinematic and force-level motor primitives employed in robot control formulations are discussed.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2010년도 제35회 추계학술대회논문집
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• pp.93-97
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• 2010

액체로켓엔진 단계식 연소 사이클에 대한 에너지 발란스 프로그램을 개발하였다. 엔진을 추력실, 터보펌프, 터빈, 예연소기, 공급계 부품 등으로 모듈화 하여 각 모듈 프로그램을 제어하는 방식을 사용하였다. 이를 통해 에너지, 질유량, 압력의 균형을 맞추었으며 대표적인 단계식 연소 사이클인 스페이스 셔틀 메인 엔진의 자료를 바탕으로 비교 검증하였다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 추계학술대회 논문집
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• pp.197-203
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• 2005

This paper presents kinematic calibration of parallel manipulators with partial pose measurements using a device that measures a rotation of the end-effector along with its position. The device contains an LVDT, a biaxial inclinometer, and a rotary sensor and facilitates automation of the measurement procedure. The device is designed in a modular fashion and links of different lengths can be used. The additional kinematic parameters required for the measurement device are discussed, kinematic relations are derived, and cost function is established to perform calibration with the proposed device. The study is performed for a six degree-of-freedom(DOF) fully parallel HexaSlide Mechanism(HSM). Experimental results show significant improvement in the accuracy of the HSM.