• 대한수학회지
• /
• 제44권2호
• /
• pp.373-391
• /
• 2007

We study an (n+3)($n\;{\geq}\;7-dimensional$ real submanifold of a (4m+3)-unit sphere $S^{4m+3}$ with Sasakian 3-structure induced from the canonical quaternionic $K\"{a}hler$ structure of quaternionic (m+1)-number space $Q^{m+1}$, and especially determine contact three CR-submanifolds with (p-1) contact three CR-dimension under the equality conditions given in (4.1), where p = 4m - n denotes the codimension of the submanifold. Also we provide necessary conditions concerning sectional curvature in order that a compact contact three CR-submanifold of (p-1) contact three CR-dimension in $S^{4m+3}$ is the model space $S^{4n_1+3}(r_1){\times}S^{4n_2+3}(r_2)$ for some portion $(n_1,\;n_2)$ of (n-3)/4 and some $r_1,\;r_2$ with $r^{2}_{1}+r^{2}_{2}=1$.

• Korean Journal of Mathematics
• /
• 제30권1호
• /
• pp.1-10
• /
• 2022

In the present paper, we have studied conformal Ricci solitons on f-Kenmotsu manifolds of dimension three. Also we have studied 𝜙-Ricci symmetry, 𝜂-parallel Ricci tensor, cyclic parallel Ricci tensor and second order parallel tensor in f-Kenmotsu manifolds of dimension three admitting conformal Ricci solitons. Finally, we give an example.

• 한국소성가공학회:학술대회논문집
• /
• 한국소성가공학회 2007년도 추계학술대회 논문집
• /
• pp.195-200
• /
• 2007

We analyzed a sequence of multi-stage automatic cold forging processes composed of four axisymmetric processes followed by a non-axisymmetric process using rigid-plastic finite element based forging simulators. The forging sequence selected for an example involves a piercing process and a heading process accompanying folding or overlapping, which all make it difficult to simulate the processes. To reduce computational time and to enhance the solution reliability, only the non-symmetric process was analyzed by the three-dimensional approach after the axisymmetric processes were analyzed by the two-dimensional approach. It has been emphsized that this capability is very helpful in simulating the multi-stage automatic forging processes which are next to axisymmetric.

• 한국안전학회지
• /
• 제8권4호
• /
• pp.54-60
• /
• 1993

The purpose of this study is to develop a CAD/CAM system for automatic creation and manufacturing of three dimension objects. The computer system used in this study made RAM 2M, CPU 80386, VGA graphic card. The results in this paper are as follows ; 1. By interconnect PC(personal computer) and NC(numerical control) milling machine with RS232C connector, we was constructed with CAD/CAM system. 2. The developed algorithm in this study is able to be design of three dimension object on the computer CRT and manufacturing of NC milling machine. 3. Because of design and modifying on the PC of objects, we can be saving time, cost and improvable precision of objects. 4. Essentially, we expect industrial accident to reduse according as we takes advantage of CAD/CAM system.

• 대한간호학회지
• /
• 제50권1호
• /
• pp.81-100
• /
• 2020

Purpose: The purpose of this study was to define and clarify the concept of political competence for nurses. Methods: A hybrid model method was used to investigate the dimensions, attributes, and definitions of the concept. In the theoretical stage of the study, literature on nursing, politics, and other discipline were reviewed. In the fieldwork stage, individual in-depth interviews and focus groups interviews were conducted with politically seasoned experts or activists who had an understanding of the concept of political competence for extensive descriptions in nursing and field of health care. Results: The concept of political competence was represented in four dimensions as political knowledge, political efficacy, political interaction, and political activity. In the political knowledge dimension, there were three attributes, namely, political knowledge, political information and systematic analysis ability. The political efficacy dimension had three attributes of internal political efficacy, external political efficacy, and self-pride of nursing profession. The political interaction dimension had three attributes of organizations and community service, networking, and persuasive power. The political activity dimension had six attributes of political leadership, political expression, assertive behavior, political advocacy, political participation, and policy intervention. Conclusion: This concept development might provide a basic understanding of developing a measurement tool and for constructing a theory promoting nurses' political competence.

• Communications for Statistical Applications and Methods
• /
• 제23권2호
• /
• pp.105-117
• /
• 2016

In the paper, as a sequence of the first tutorial, we discuss sufficient dimension reduction methodologies used to estimate central subspace (sliced inverse regression, sliced average variance estimation), central mean subspace (ordinary least square, principal Hessian direction, iterative Hessian transformation), and central $k^{th}$-moment subspace (covariance method). Large-sample tests to determine the structural dimensions of the three target subspaces are well derived in most of the methodologies; however, a permutation test (which does not require large-sample distributions) is introduced. The test can be applied to the methodologies discussed in the paper. Theoretical relationships among the sufficient dimension reduction methodologies are also investigated and real data analysis is presented for illustration purposes. A seeded dimension reduction approach is then introduced for the methodologies to apply to large p small n regressions.

• 패션비즈니스
• /
• 제22권1호
• /
• pp.135-147
• /
• 2018

Since the 20th century, there has been a growing interest in the new concept of fractals, a combination of mathematics and art, and the attempt to study the creative spatial aspects of the concept is being made. The purpose of this research is to examine artistic characteristics of fractal dimension and then analyze the types of fractal dimensions expressed in the fashion. Previous literature on fractals and dimension, and visual data on art and fashion collected over the Internet were used for analysis. Fractal dimension refers to the spatial concept of structural dimension of geometrical self-similarity. An analysis of the types of fractals seen in fashion revealed spatial expansion, the repetition in continual figures, superposition accordant to different sizes, and shades of different shapes. The aesthetic characteristics of fractal dimension appearing in fashions were examined based on analyses of fractal dimension types; the inherent characteristics of self-similarity, superimposition, and atypicality were found. Results obtained from this study are expected to be used as basic materials for the application of the design of fractal dimension into various perspectives of fashion.

• 한국지능시스템학회논문지
• /
• 제21권5호
• /
• pp.537-542
• /
• 2011

거울 신경 세포는 동물이 어떤 동작을 할 때와 그 동물이 다른 동물의 동일한 동작을 하는 것을 관찰 할 때, 똑같은 세포 발화를 하는 신경세포이다. 본 논문에서는 거울 신경 세포의 발화 원리를 이용하여 비슷한 방법으로 보이지 않는 부분에 대한 객체의 움직임을 추적하는 방법을 3차원 재구축 방법을 통해 제안한다. 거울 신경 세포 시스템과 같은 발화 원리를 통해 의도 인지 시스템을 구축하기 위해, 스테레오 카메라를 통해 획득한 두 개의 이미지 데이터를 통해 깊이 정보를 계산하여 3차원으로 재구축한다. 3차원 재구축을 통해 만들어진 이미지 데이터를 옵티컬 플로우를 사용하여 3차원 이미지에서 객체의 움직임 방향을 추정한다. Estimation 알고리즘인 칼만 필터를 사용하여 객체의 움직임 추정을 잡음에 강인하게 한다. 객체의 움직임 추정을 통하여 객체의 움직임에 따라 구축된 이미지 데이터를 히스토리화 하여 데이터를 저장한다. 객체의 일부분 혹은 전체가 다른 물체로 인해 가려져 스테레오 카메라 시야에서 사라졌을 때, 과거에 저장된 히스토리로 부터 데이터를 가져와 가려진 부분에 대한 객체의 원래의 모습을 복원한다. 이 복원을 통하여 움직임 추정을 한다.

• 한국측량학회지
• /
• 제21권1호
• /
• pp.81-87
• /
• 2003

Web 기반 네트워크 환경에서 3차원의 실세계를 파악하는 것은 매우 어려운 과제이다. 그러나 최근의 시뮬레이션 도구들은 여러 가지 3차원 구현 기술들을 접목하여 제한된 2차원 화면 속에서 3차원 요소들을 효율적으로 구현시켜 나가고 있는 추세이다. 많은 GIS 도구들이 3차원 자료 생성을 위한 훌륭한 기능들을 제공하고 있다. 그러나 웹 환경에서 가상현실기법을 이용한 3차원 CIS의 설계에 대한 연구는 미진한 상태이다. 그래서 이 연구에서는 고가의 Map전용 프로그램의 지원 없이 웹상에서 원하는 방향, 시점에 대한 시각적 정보를 제공할 수 있는 능동적 3차원 VR지도를 제작하기 위해 가상현실모델링언어를 이용하여 3차원 지형 Map을 구현하였으며, 이러한 3D Web-Map은 차세대 지도매체로서 그 가능성이 충분하다고 여겨진다.

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 2005년도 ICCAS
• /
• pp.1115-1117
• /
• 2005

This paper describes the three dimension model and simulation results of a thermal actuator based on polyMUMPs process, known as thermal multimorph actuator. The device has potential application in micro-transducers such as atomic force microscope (AFM) tip and scanning tunneling microscope (STM) tip. This device made of a multi-layer materials stack together with consisted of polysilicon, $SiO_2$ and gold. A mask layout design, three dimension model and simulation results are reported and discussed.