• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1990년도 한국자동제어학술회의논문집(국제학술편); KOEX, Seoul; 26-27 Oct. 1990
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• pp.1071-1076
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• 1990

This paper proposes a navigation strategy of multiple autonomous mobile robots with communication within a specified space. Assuming that each robot has complete detectability with finite range, simple navigation strategy is derived by introducing repulsive forces between robots and attractive force between a robot and its goal point analogous to those between electric charges. When a robot is close to its goal point, a pseudo-domain based on the distance between the closest point of the domain boundary and the goal point is proposed to enhance its convergence to the goal state. This paper concludes with the results of computer simulation studies on the dynamic behavior of multiple interacting robots with the proposed navigation strategy.

• Structural Engineering and Mechanics
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• 제53권4호
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• pp.745-765
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• 2015

A nonlinear Finite Element (FE) algorithm is proposed to analyze the Reinforced Concrete (RC) columns subjected to Cyclic Loading (CL), Cyclic Oriented Lateral Force and Axial Loading (COLFAL), Monotonic Loading (ML) or Oriented Pushover Force and Axial Loading (OPFAL) in any direction. In the proposed algorithm, the following parameters are considered: uniaxial behavior of concrete and steel elements, the pseudo-plastic hinge produced in the critical sections, and global behavior of RC columns. In the proposed numerical simulation, the column is discretized into two Macro-Elements (ME) located between the pseudo-plastic hinges at critical sections and the inflection point. The critical sections are discretized into Fixed Rectangular Finite Elements (FRFE) in general cases of CL, COLFAL or ML and are discretized into Variable Oblique Finite Elements (VOFE) in the particular cases of ML or OPFAL. For pushover particular case, a fairly fast converging and properly accurate nonlinear simulation method is proposed to assess the behavior of RC columns. The proposed algorithm has been validated by the results of tests carried out on full-scale RC columns.

• 한국수학교육학회지시리즈B:순수및응용수학
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• 제25권2호
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• pp.149-160
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• 2018

In this paper, we prove a strong convergence result under an iterative scheme for N finite asymptotically $k_i-strictly$ pseudo-contractive mappings and a firmly nonexpansive mappings $S_r$. Then, we modify this algorithm to obtain a strong convergence result by hybrid methods. Our results extend and unify the corresponding ones in [1, 2, 3, 8]. In particular, some necessary and sufficient conditions for strong convergence under Algorithm 1.1 are obtained.

• Imaging Science in Dentistry
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• 제48권1호
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• pp.73-77
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• 2018

Organized hematoma is a pseudo-tumorous lesion mostly occurs at sinonasal cavity and often confused with malignant neoplasm. The initiation of this lesion is blood accumulation, probably due to trauma, and this hematoma develops into organized hematoma as it encapsulated with fibrous band and neo-vascularized. Since it is uninformed at temporomandibular joint (TMJ) region, imaging diagnosis might be challenging. Also, delayed detection of mass involving TMJ is not uncommon due to confusion with joint disorder. Thus, this report introduced the rare pathology, organized hematoma on TMJ with advanced imaging features. Also, diagnostic point for early detection was described for the TMJ tumors and pseudo-tumors considering complexity of surgical intervention in this region.

• 대한수학회지
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• 제53권5호
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• pp.1077-1100
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• 2016

We develop an invariant local theory of Lorentz surfaces in pseudo-Euclidean 4-space by use of a linear map of Weingarten type. We find a geometrically determined moving frame field at each point of the surface and obtain a system of geometric functions. We prove a fundamental existence and uniqueness theorem in terms of these functions. On any Lorentz surface with parallel normalized mean curvature vector field we introduce special geometric (canonical) parameters and prove that any such surface is determined up to a rigid motion by three invariant functions satisfying three natural partial differential equations. In this way we minimize the number of functions and the number of partial differential equations determining the surface, which solves the Lund-Regge problem for this class of surfaces.

• International Journal of Advanced Culture Technology
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• 제9권4호
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• pp.86-93
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• 2021

This paper aims to investigate a novel affix prevalently and productively used in social media, which is assumed to be borrowed from English into Korean loanblens. The novel affix is composed of a prefix-like and a suffix-like elements, but it seems to be distinguished from other regular combinations of a prefix and a suffix. In analyzing the affix, we attempt to highlight its peculiarities of the affix with empirical data. First, the seemingly borrowed affix does not behave like affixes found in the donor language (English) or the recipient language (Korean) from a linguistic point of view. Both languages have circumfixation rarely available in productive word-formation processes. Second, no regular assimilation rules of Korean apply to the affix boundary, which would otherwise be mandatory to such syllable contact contexts. Last but not least, the affix form has no correspondence to the donor language, and therefore it is claimed to be derived through secretion and taken as a case of pseudo-anglicisms.

• East Asian mathematical journal
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• 제25권4호
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• pp.415-423
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• 2009

In this paper, we consider the hybrid monotone projection algorithm for asymptotically quasi-pseudocontractive mappings. A strong convergence theorem is established in the framework of Hilbert spaces. Our results mainly improve the corresponding results announced by [H. Zhou, Demiclosedness principle with applications for asymptotically pseudo-contractions in Hilbert spaces, Nonlinear Anal. 70 (2009) 3140-3145] and also include Kim and Xu [T.H. Kim, H.K. Xu, Strong convergence of modified Mann iterations for asymptotically nonexpansive mappings and semigroups, Nonlinear Anal. 64 (2006) 1140-1152; Convergence of the modified Mann's iteration method for asymptotically strict pseudo-contractions, Nonlinear Anal. 68 (2008) 2828-2836] as special cases.

• 대한수학회지
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• 제54권1호
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• pp.69-86
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• 2017

The point $P{\in}{\mathbb{P}}^2$ is referred to as a Galois point for a nonsingular plane algebraic curve C if the projection ${\pi}_P:C{\rightarrow}{\mathbb{P}}^1$ from P is a Galois covering. In contrast, the point $P^{\prime}{\in}C^{\prime}$ is referred to as a weak Galois Weierstrass point of a nonsingular algebraic curve C' if P' is a Weierstrass point of C' and a total ramification point of some Galois covering $f:C^{\prime}{\rightarrow}{\mathbb{P}}^1$. In this paper, we discuss the following phenomena. For a nonsingular plane curve C with a Galois point P and a double covering ${\varphi}:C{\rightarrow}C^{\prime}$, if there exists a common ramification point of ${\pi}_P$ and ${\varphi}$, then there exists a weak Galois Weierstrass point $P^{\prime}{\in}C^{\prime}$ with its Weierstrass semigroup such that H(P') = or , which is a semigroup generated by two positive integers r and 2r + 1 or 2r - 1, such that P' is a branch point of ${\varphi}$. Conversely, for a weak Galois Weierstrass point $P^{\prime}{\in}C^{\prime}$ with H(P') = or , there exists a nonsingular plane curve C with a Galois point P and a double covering ${\varphi}:C{\rightarrow}C^{\prime}$ such that P' is a branch point of ${\varphi}$.

• 대한원격탐사학회지
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• 제17권1호
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• pp.33-44
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• 2001

본 논문은 지상기준접의 취득이 어려운 비접근 지역에 대한 위성영상에서 지형정보를 획득하기 위한 방법을 제시하였다. 먼저, 공선조건식을 기반으로 10개의 위성센서모델을 개발하고, 개발된 센서모델의 거동을 부석하기 위하여 Space Resection 및 Space Intersection을 통해 각각의 센서모델에 대한 적합성을 실험하였다. 이를 바탕으로 비접근 지역에 대한 지형정보를 취득하기 위하여 영상을 재구성하거나 Pseudo영상을 제작하고, 이에 대한 센서모델의 거동 및 정확도를 분석.제시하였다. 공선조건식을 이용한 Pushbroom 위성영상의 센서모델은 투영중심의 위치와 회전요소에 대한 6개의 외부표정요소를 영상의 행에 대한 1차, 2차 함수 또는 3차 함수로 구성하였으며, 또한 외부표정요소의 위치요소와 상관도가 높은 회전요소($\omega$, $\Phi$)를 고정된 값으로 사용하는 센서모델을 개발하였다. 비접근 지역을 위한 영상의 재구성은 동일 패스의 지상기준접이 있는 영상과 비접근 지역의 영상을 연결시켜 하나의 영상으로 재구성하거나, 지상기준점이 있는 영상과 비접근 지역의 영상으로부터 Pseudo영상을 임의로 제작하여 패스내에서 중복영역을 갖도록 구성하였다. 본 연구에서 이용한 인공위성 데이터는 서로 다른 패스에서 동일한 지역을 촬영한 SPOT 영상이며, 각각의 패스에서 두장의 연속된 영상을 이용하였다. 개발된 10개의 센서모델과 5가지의 영상 재구성 방법에 따라 비접근 지역에서의 정확도는 다르게 나타났으며, 그 중 투영중심의 위치 및 회전요소 k를 1차 함수로 표현하고 회전요소 $\omega$, $\Phi$를 고정시킨 센서모델과 Pseudo영상을 이용한 방법이 비접근 지역 30km, 60km지점의 검사점에서 각각 최대오차 30m, 60m의 결과를 보였다. 얻어진 극한하중 보다 적은 경향을 나타냈다.aeuntang were higher than the recommended value per meal. Vitamin A, vitamin C, vitamin B$_1$, vitamin B, niacin, calcium, phosphorus and iron were rich in chwotang and minmulgokimaeuntag. Onhuk contains plenty of vitamin C, vitamin B$_1$, vitamin B$_2$and the contents of vitamin A, vitamin B$_1$, and niacin in baekhapapchuk were over the recommended values per meal. The foods contained large percentage of aspartic acid and glutamic acid, and major essential amino acids appeared to be leucine and lysine. On the other hand, major fatty acids were oleic acid, linoleic acid and plamitic acid. Among them the content of oleic acid was the highest in chuotang, ochuk and baekhapchuk, whereas linoleic acid and palmitic acid were the most rich fatty acids in baekhapchuk and dasulgitang respectively.한 있을 것으로 생각된다. 그리고 본 조사는 5월부터 7월중에 실시하였는데, 한국의 경우 계절에 따라 섭취 식품의 종류가 다

• Journal of applied mathematics & informatics
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• 제29권3_4호
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• pp.603-619
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• 2011

To the best of our knowledge, it would probably be the first time in the literature that we clarify the relationship between Yamada's method and viscosity iteration correctly. We design iterative methods based on the hybrid steepest descent algorithms for solving variational inclusions, equilibrium problems. Our results unify, extend and improve the corresponding results given by many others.