• 제어로봇시스템학회논문지
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• 제8권8호
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• pp.698-705
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• 2002

The redundant sensor configuration problem of inertial navigation system(INS) is considered and analyzed the navigation and fault detection performance according to various sensor configurations. We considered various kinds of redundant sensor configurations for symmetric, cone, and orthogonal configurations and compare the navigation and fault detection performance for the configurations. We show that the navigation and fault detection performance is not affected by the coordinate change for a fixed configuration.

• Journal of applied mathematics & informatics
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• 제18권1_2호
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• pp.685-689
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• 2005

We find some Hilbert functions of codimension 4, which are obtained from only k-configurations in $\mathbb{P}^{3}$ and support the $3^{rd}$ linear syzygy.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 ITC-CSCC -3
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• pp.2047-2050
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• 2002

At present, many applications independently provide access control for their own resources, for example Web, Databases and Operating Systems, etc. Such independent access control systems result in multiple access control configurations each of which deals with the access control in its own application context. Since those multiple configurations are operated in isolation, and maintained by possibly different administrators, they are likely to be incoherent. In this paper, we propose a logical specification to reason about multiple access control configurations. Our specification can be used to detect the incoherence in multiple configurations. Furthermore, it of offers many kinds of policies for multiple configurations that can capture several kinds of requirements for multiple access control systems.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2001년도 ICCAS
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• pp.116.5-116
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• 2001

When inertial navigation system(INS) employ more sensors that mutually orthogonal sets to three, the redundant sensor system can have improved reliability and accuracy. For the redundant system the placement of redundant sensors is related to the system performance and also the number and proper orientation of sensors are important. We consider INS sensor configurations using two IMUs comprised mutually orthogonal sets of three. We suggest several configurations using two IMUs and analyze the system performance and the FDI(fault detection and isolation) properties from suggested configurations.

• Structural Engineering and Mechanics
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• 제7권6호
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• pp.601-614
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• 1999

The mechanical behaviours of the structure made from composite materials or the structure with periodic configurations depend not only on the macroscopic conditions of structure, but also on the detailed configurations. The Two-Scale Analysis (TSA) method for these structures, which couples the macroscopic characteristics of structure with its detailed configurations, is configurations, is presented for 2 or 3 dimensional case in this paper. And the finite element algorithms based on TSA are developed, and some results of numerical experiments are given. They show that TSA with its finite element algorithms is more effective.

• 로봇학회논문지
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• 제11권3호
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• pp.163-171
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• 2016

A modular manipulator in serial-chain structure usually consists of a series of modularized revolute joint and link modules. The geometric shapes of these modules affect the number of possible configurations of modular manipulator after assembly. Therefore, it is important to design the geometry of the joint and link modules that allow various configurations of the manipulators with minimal set of modules. In this paper, a new 1-DoF(degree of freedom) joint module and simple link modules are designed based on a methodology of joint configurations using a series of Rotational(type-R) and Twist(type-T) joints. Two of the joint modules can be directly connected so that two types of 2-DoFs joints could be assembled without a link module between them. The proposed geometries of joint and link modules expand the possible configurations of assembled modular manipulators compared to existing ones. Modular manipulator system of this research can be a cornerstone of user-centered markets with various solution but low-cost, compared to conventional manipulators of fixed-configurations determined by the provider.

• 한국과학교육학회지
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• 제39권6호
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• pp.755-765
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• 2019

이 연구는 초등학교 교사의 관점에서 융합인재교육의 실행 형태를 측정하기 위한 측정도구를 개발하고 이를 활용하여 실행 형태와 관련 배경 요인이 실행 수준에 미치는 영향을 조사하였다. 실행형태의 측정도구는 다양한 선행 연구 및 심층면접 등의 분석을 기반으로 개발되었고, '수업준비', '수업설계', '수업운영', '평가'의 4개 세부 요인으로 구성되었다. 사전 개발된 측정 문항을 바탕으로 전국의 융합인재교육 연구·선도학교의 교사, 융합인재교육 교사연구회 활동을 하는 교사, 그리고 융합인재교육을 실시하고 있는 일반 초등학교 교사 266명을 대상으로 융합인재교육 실행 형태를 조사하였다. 탐색적 요인분석 및 신뢰도 분석을 통하여 융합인재교육의 실행 형태를 측정을 위한 총 19개의 측정 문항을 확정하였다. 초등교사의 융합인재교육의 실행형태와 그 실제 실행수준의 관계를 조사하기 위해 먼저, 실행형태의 4개 세부 요인과 실행수준의 직접적 영향을 조사하고, 배경 요인으로 고려한 초등교사의 교육경력, 융합인재교육 연수경험이 이 실행형태 각 세부 요인과 실행수준에 미치는 영향을 조사하였다. 마지막으로 실행형태 4개 세부 요인과 배경요인의 상호작용을 동시에 고려하여 실행수준과의 관계를 분석하였다. 분석의 결과, 초등교사의 융합인재교육의 실행수준을 개선시키기 위한 방안으로 실행형태의 '수업운영' 요소와 배경변인 중 '연수경험'의 유의미한 상관이 도출되었으며, 이 연구를 통하여 개발된 측정도구는 초등교사의 관점에서 융합인재교육의 실행을 분석하는 데에 유용할 뿐 아니라, 바람직한 개선 추구에 기여할 수 있을 것이다.

• Structural Engineering and Mechanics
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• 제6권5호
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• pp.543-554
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• 1998

Space truss structures may be fabricated in any of several common grid configurations. With different configurations, the truss performance varies considerably affecting both its competitiveness and suitability for specific applications. The work presented in this paper is an assessment of the most commonly adopted truss configurations and their effect on truss characteristics such as the stiffness/weight value, member stress distribution, number of joints and members, degree of redundancy and cost. The study is parametric and covers wide variations of truss aspect ratios, boundary conditions and span/depth ratios. The results of this study could be of significant value to the design of space truss structures.

• 대한수학회논문집
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• 제31권4호
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• pp.683-693
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• 2016

In [1], the authors proved that the finite union of linear star-configurations in $\mathbb{P}^2$ has a generic Hilbert function. In this paper, we find the minimal graded free resolution of the union of two linear star-configurations in $\mathbb{P}^2$ of type $s{\times}t$ with $\(^t_2\){\leq}s$ and $3{\leq}t$.

• Steel and Composite Structures
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• 제19권1호
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• pp.173-190
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• 2015

This study presents an analytical investigation on the seismic response of a medium-rise buckling-restrained braced frame (BRBF) under the near-fault ground motions. A seven-story BRBF is designed as per the current code provisions for five different combinations of brace configurations and beam-column connections. Two types of brace configurations (i.e., Chevron and Double-X) are considered along with a combination of the moment-resisting and the non-moment-resisting beam-to-column connections for the study frame. Nonlinear dynamic analyses are carried out for all study frames for an ensemble of forty SAC near-fault ground motions. The main parameters evaluated are the interstory and residual drift response, brace displacement ductility, and plastic hinge mechanisms. Fragility curves are developed using log-normal probability density functions for all study frames considering the interstory drift ratio and residual drift ratio as the damage parameters. The average interstory drift response of BRBFs with Double-X brace configurations significantly exceeded the allowable drift limit of 2%. The maximum displacement ductility characteristics of BRBs is efficiently utilized under the seismic loading if these braces are arranged in the Double-X configurations instead of Chevron configurations in BRBFs located in the near-fault regions. However, BRBFs with the Double-X brace configurations exhibit the higher interstory drift and residual drift response under near-fault ground motions due to the formation of plastic hinges in the columns and beams at the intermediate story levels.