• Title/Summary/Keyword: 설계알고리즘

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Design Optimization Method of Inertial Parameters of Serial Manipulators for Improving the Energy Efficiency (에너지 효율 향상을 위한 직렬형 머니퓰레이터의 관성 파라미터 설계 최적화 방법)

  • Hwang, Soon-Woong;Kim, Hyeon-Guk;Choi, Youn-Sung;Shin, Kyoo-Sik;Han, Chang-Soo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.11
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    • pp.395-402
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    • 2016
  • This paper presents a design methodology for improving the energy efficiency by considering the inertial properties of serial manipulators. This method employed is to put the inertia matrix, which has a critical effect on the equation of motion, into the constraints of the optimization problem. Through the optimization process, we propose a design algorithm that can double-check whether the optimized parameters satisfy the required performance or not by using an auxiliary index associated with the inertia and energy. Using this design algorithm, we were able to improve the energy efficiency by minimizing the torque. We applied this method to a 3 degrees of freedom serial manipulator and simulated it.

Optimum Design of Reinforced Concrete Plane Frames Based on Section Database (데이터베이스에 기반한 RC 평면 프레임 구조물의 최적설계)

  • Kwak, Hyo-Gyoung;Kim, Ji-Eun
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.20 no.2
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    • pp.165-179
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    • 2007
  • For the purpose of optimum design of reinforced concrete structures, pre-determined section database of column and beam are constructed and arranged in order of the resisting capacity. Then, regression equations representing the relation between section number and section resisting capacity are derived. In advance, effective optimization algorithms which search optimized solution quickly using direct search method from these database are proposed. In practice, from the fact that engineers conduct member design close to capacity optimization rather than cost optimization, both capacity and cost optimization using proposed algorithms are performed, and the review for the obtained results are followed. Moreover, the investigation for the applicability and effectiveness of the Introduced design procedure is conducted through correlation study for example structures. Because of no restriction in constructing objective functions with very simple optimization processes and fast convergence, the introduced method can effectively be used in the preliminary design stage. Especially, selected solutions from database are directly applicable in practice because these sections already satisfy all the requirements in design codes and practical restrictions.

Optimum Structural Design of Sinusoidal Corrugated Web Beam Using Real-valued Genetic Algorithm (실변수 유전자 알고리즘을 이용한 사인형 주름 웨브 보의 최적구조설계)

  • Shon, Su-Deok;Lee, Seung-Jae
    • Journal of Korean Society of Steel Construction
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    • v.23 no.5
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    • pp.581-593
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    • 2011
  • The underlying advantages of using thin-walled corrugatedwebs instead of plate girders with stiffeners are the elimination of instability problems associated with buckling of the thin-walled flat plate, and elimination of the need for transverse stiffeners, which alsoresults in economic advantages. This paper focuses on two aspects related to the structural design technique forsinusoidal corrugated web steel beams, and the optimum design of the beams using real-value genetic algorithms. The structural design process and design variables used in this optimization werecomposed with EN 1993-1-5, DASt-R015 standard and Pasternak et al. (2004), and the valid design capacity of shear buckling of the standards were compared. For the optimum structural design, the objective function, presented as the fullweight of the sinusoidal corrugated web beams, and the slenderness, member forces, and maximum deflection of the beam, were considered constraints. Finally, the simple beam under the uniform load was adopted as a numerical example, and the effective probability parameters of the genetic operators were considered to find the global minimum point.

Study on a Model-based Design Technique for Monitoring and Control of a Vehicle Cluster (자동차 클러스터의 감시 및 제어를 위한 모델기반설계 기법 연구)

  • Kim, Dong Hun
    • Journal of the Korean Institute of Intelligent Systems
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    • v.27 no.1
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    • pp.35-41
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    • 2017
  • This paper presents the development of a monitoring and control system for a vehicle cluster using a model-based design technique. For MBD(model-based design), MATLAB GUI(Graphic User Interface), M programs, simulink, state flow, and tool boxes are used to monitor a number of data such as warning, interrupts, and etc. connected to a real vehicle cluster. As a monitoring tool, a PC(Personal Computer) station interworks with the real vehicle cluster through the interface commands of tool boxes. Thus, unlike existing text-based designs, the MBD based vehicle cluster system provides very easy algorithm updates and addition, since it offers a number of blocks and state flow programs for each functional actions. Furthermore, the proposed MBD technique reduces the required time and cost for the development and modification of a vehicle cluster, because of verification and validation of the cluster algorithm on the monitor through a PC.

Optimal Structural Design Framework of Composite Rotor Blades Using PSGA (PSGA를 이용한 복합재료 블레이드의 최적 구조설계 프레임워크 개발 연구)

  • Ahn, Joon-Hyek;Bae, Jae-Seong;Jung, Sung Nam
    • Composites Research
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    • v.35 no.1
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    • pp.31-37
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    • 2022
  • In this study, an optimal structural design framework has been developed for the structural design of composite helicopter blades. The optimal design framework is constructed using PSGA (Particle Swarm assisted Genetic Algorithm), which combines the genetic algorithm and particle swarm optimizer. The optimization process consists of a finite element (FE) modeling over the blade section, two-dimensional (2D) cross-sectional FE analysis, and 1D rotating blade analysis. In the design process, the geometric curves and surfaces are formed using the B-spline scheme while discretizing the sections via a FE mesh generation program Gmsh. The blade cross-sections are created in accordance with the design variables when performing the blade structural analysis. The proposed optimization design framework is applied to a modernization of the HART II (Higher-harmonic Aeroacoustics Rotor Test II) blades. It is demonstrated that an improved blade design is reached through the current optimization framework with the satisfaction of all design requirements set for the study.

The Risk Assessment for Structures by the Response Surface Method Combined with Genetic Algorithm (유전자 알고리즘과 결합된 응답면기법을 이용한 구조물의 위험성 평가)

  • Cho, Tae-Jun;Han, Shocky
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2009.04a
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    • pp.392-395
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    • 2009
  • 응답면 기법을 활용하여 댐구조물과 같은 사회간접자본 시설물의 파괴확률을 구할 수 있다. 본 위험성 평가과정에서 응답면기법으로 구성한 한계상태 방정식을 유전자알고리즘의 적합도 방정식으로 사용하면, 핵심타입이나 지반종류, 지반다짐정도 등의 입력설계변수의 최적화 과정 속도를 더욱 신속화 시킬 수 있다. 제안된 응답면 기법과 유전자알고리즘의 복합해석기법은 신뢰성기반 최적화프로그램으로 기존의 유전자알고리즘의 수렴속도를 더욱 빠르게 하여주고, 특히 입력변수의 상하한계가 불확실한 경우에도 만족스러운 수렴성을 보장하여준다. 한계상태 방정식의 목표신뢰도 지수를 변화시켜면 해당하는 입력변수의 최적값을 출력하여주므로, 입력변수의 제약조건에 가격함수와 같은 가중치를 벌칙함수로 부여하면 가격최적화 프로그램으로 작용하게 되며, 시설물 운영자에게는 목표신뢰도에 대한 유지관리 기법과 정도를 의사결정 할 수 있도록 하여주는 기능을 가지게 된다. 조사된 많은 댐구조물의 파괴모드가 시간에 독립적으로 시공중 또는 시공완료 후 5년이내에 다수 발생하는바, 파괴모드를 조사하고 중요한 파괴모드인 파이핑 현상에 대해서 파괴확률을 계산하고 최적유지관리를 위한 개선된 유전자알고리즘 최적화 연산을 수행하였다. 기존 댐구조물과 같이 설계변수와 하중의 변동성을 알기가 어려운 경우에 유지관리비용 최소화를 위해서 본 제안 프로그램의 확장된 버젼은 중요한 기준을 제시하여줄 것으로 기대한다.

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An FPGA Implementation of Acoustic Echo Canceller Using S-LMS Algorithm (S-LMS 알고리즘을 이용한 음향반향제거기의 FPGA구현)

  • 이행우
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.41 no.9
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    • pp.65-71
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    • 2004
  • This paper describes a new adaptive algorithm which can reduce the required computation quantities in the adaptive filter. The proposed S-LMS algorithm uses only the signs of the normalized input signal rather than the input signals when coefficients of the filter are adapted. By doing so, there is no need for the multiplications and divisions which are mostly responsible for the computation quantities. To analyze the convergence characteristics of the proposed algorithm, the condition and speed of the convergence are derived mathematically. Also, we simulate an echo canceller adopting this algorithm and compare the performances of convergence for this algorithm with the ones for the other algorithm. As the results of simulations, it is proved that the echo canceller adopting this algorithm shows almost the same performances of convergence as the echo canceller adopting the SIA algorithm.

Design and Implementation of Simulator for Topology Aggregation in Private Networks to Networks Interface and Performance Analysis of TA Algorithms (사설망 인터페이스에서 토폴로지 요약 테스트를 위한 시뮬레이터 설계 구현 및 TA 알고리즘 성능분석)

  • Kim, Nam-Hee;Kim, Byun-Gon;Seo, Hae-Young;Park, Ki-Hong
    • The Journal of the Korea Contents Association
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    • v.7 no.5
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    • pp.1-9
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    • 2007
  • Topology information can be constructed hierarchically in the networks and the process of aggregating topology information is known as TA(Topology Aggregation). It is very important for scalability in networks. In paticular, routing and TA algorithm are very much elements on networks performance in private networks to networks interface. Therefore, in this paper, we designed and implemented routing simulator for TA in private networks to networks interface. And we evaluated and analyzed the existent TA algorithm using the implemented simulator. The implemented simulator can be used valuably to developing TA algorithm.

A Dynamic Hardware Allocation and Binding Algorithm for SOC Design Automation (SOC 설계 자동화를 위한 동적인 하드웨어 할당 및 바인딩 알고리즘)

  • Eom, Kyung-Min;Lin, Chi-Ho
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.9 no.3
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    • pp.85-93
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    • 2010
  • This paper proposes a new dynamic hardware allocation and binding algorithm of a simultaneous allocation and binding for SOC design automation. The proposed algorithm works on scheduled input graph and simultaneously allocates binds functional units, interconnections and registers by considering interdependency between operations and storage elements in each control step, in order to share registers and interconnections connected to functional units, as much as possible. This paper shows the effectiveness of the proposed algorithm by comparing experiments to determine number of function unit in advance or by comparing separated executing allocation and binding of existing system.

Design of Pattern Classification Rule based on Local Linear Discriminant Analysis Classifier by using Differential Evolutionary Algorithm (차분진화 알고리즘을 이용한 지역 Linear Discriminant Analysis Classifier 기반 패턴 분류 규칙 설계)

  • Roh, Seok-Beom;Hwang, Eun-Jin;Ahn, Tae-Chon
    • Journal of the Korean Institute of Intelligent Systems
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    • v.22 no.1
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    • pp.81-86
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    • 2012
  • In this paper, we proposed a new design methodology of a pattern classification rule based on the local linear discriminant analysis expanded from the generic linear discriminant analysis which is used in the local area divided from the whole input space. There are two ways such as k-Means clustering method and the differential evolutionary algorithm to partition the whole input space into the several local areas. K-Means clustering method is the one of the unsupervised clustering methods and the differential evolutionary algorithm is the one of the optimization algorithms. In addition, the experimental application covers a comparative analysis including several previously commonly encountered methods.