• 전자공학회논문지A
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• 제28A권9호
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• pp.761-773
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• 1991

In this paper, an algorithm for automatic schematic generation which creates schematic diagram from netlist are proposed. The important objectives on schematic generation are readability and clarity of resulting schematics. Each stage of generation should aim at enhancing these objectives. For this reason, schematic generation problem is divided into 5 subproblems` preprocessing, logical placement, pin assignment and improvement of placement, global routing, and detailed routing. The algorithm is implemented in C language, and it generates schematics from the results of logic synthesis in order to make it east for designers to understand the design and reflect their knowledge into design.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2001년도 춘계학술대회논문집C
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• pp.269-274
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• 2001

In order to reduce trial-and-errors in the die design and production, CAE systems for analysis of stamping tools have been introduced at the initial design stage recently. For optimal design, the CAE engineers may need to correct the meshes generated by automatic mesh generation programs. However, they may need help of CAD engineers as they are usually not skilled in manipulation of CAD systems. In order to get around these problems, automatic shell mesh modification method is proposed, which utilizes existing CAD/CAE package (in this study, I-DEAS) without user interaction. The developed method and optimization techniques are applied to a stamping die rounding optimization problem. The optimization results show that the manpower and the time required at virtual tryout can be reduced by using the developed systems.

• 한국멀티미디어학회:학술대회논문집
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• 한국멀티미디어학회 2001년도 추계학술발표논문집
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• pp.890-895
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• 2001

In this paper, we address on the problem of automatic scheduling and motion generation of multiple mobile robots fur collecting material parts. We propose a model and so]union algorithm for the system. The formulated problem is divided into two kinds of problems; assignment problem and planning problem of robot motion. In this paper, several approaches to solution methods are presented and compared through computer simulation.

• 대한기계학회논문집A
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• 제25권6호
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• pp.1004-1014
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• 2001

The fully automatic algorithm from initial finite element mesh generation to remeshing in two dimensional geometry is introduced using bubble packing method (BPM) for finite element analysis. BPM determines the node placement by force-balancing configuration of bubbles and the triangular meshes are made by Delaunay triangulation with advancing front concept. In BPM, we suggest two node-search algorithms and the adaptive/recursive bubble controls to search the optimal nodal position. To use the automatically generated mesh information in FEA, the new enhanced bandwidth minimization scheme with high efficiency in CPU time is developed. In the remeshing stage, the mesh refinement is incorporated by the control of bubble size using two parameters. And Superconvergent Patch Recovery (SPR) technique is used for error estimation. To verify the capability of this algorithm, we consider two elasticity problems, one is the bending problem of short cantilever beam and the tension problem of infinite plate with hole. The numerical results indicate that the algorithm by BPM is able to refine the mesh based on a posteriori error and control the mesh size easily by two parameters.

• 대한기계학회논문집A
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• 제25권12호
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• pp.1926-1932
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• 2001

In this second part of the paper, the automatic mesh generation and remeshing algorithm using bubble packing method is applied to the nonlinear problem. The remeshing/refinement procedure is necessary in the large deformation process especially because the mesh distortion deteriorates the convergence and accuracy. To perform the nonliear analysis, the transfer of state variables such as displacement and strain is added to the algorithm of Part 1. The equilibrium equation based on total Lagrangian formulation and elasto-viscoplastic model is used. For the numerical experiment, the upsetting process including the contact constraint condition is analyzed by two refinement criteria. And from the result, it is addressed that the present algorithm can generate the refined meshes easily at the largely deformed area with high error.

• 소성∙가공
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• 제12권3호
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• pp.194-201
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• 2003

An automatic quadrilateral mesh generator for large deformation finite element analysis such as metal forming simulation was developed. The NURBS interpolation method is used for modeling arbitrary 2-D free surface. This mesh generation technique is the modified paving algorithm, which is an advancing front technique with element-by-element resolving method for paving boundary intersection problem. The mesh density for higher analysis accuracy and less analysis time can be easily controlled with high-density points, maximum and minimum element size. A couple of application to large deformation finite element analysis is given as an example, which shows versatility and applicability of the proposed approach and the developed mesh generator for large deformation finite element analysis.

• 한국항행학회논문지
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• 제14권5호
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• pp.618-624
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• 2010

본 논문에서는 다중물체를 추적하기 위해서 적합한 것으로 알려진 condensation 알고리즘의 자동 코드 발생기를 연구한 결과를 보인 것이다. 일반적으로 condensation 알고리즘은 일반인이 구현하기 매우 어려워 실제 유비쿼터스 상황인지를 위하여 필요한 기술임에도 불구하고 널리 이용되지 못하고 있다. 본 논문에서는 이 같은 문제점을 개선하기 위하여 시스템 다이나믹스 모델과 측정 모델이 주어지면 요구하는 성능을 만족하는 condensation algorithm이 내장된 필터를 자동으로 만들어주는 MATLAB 코드를 발생하도록 설계하였다. 일단 발생된 MATLAB 코드는 C, C++ 언어 등으로 변환되므로 원하는 소스를 얻을 수 있다.

• 한국산학기술학회논문지
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• 제8권5호
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• pp.1092-1097
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• 2007

온톨로지의 구축은 상당한 시간과 비용을 소모하기 때문에 상업적인 시맨틱 웹의 구축은 매우 어려운 작업이다. 이러한 문제의 해결 방법은 온톨로지를 자동적으로 구축하는 것이다. 본 논문에서는 대부분의 중요한 정보를 포함하고 있는 웹 문서를 분석하여 온톨로지를 자동으로 생성하는 시스템을 제안한다. 제안하는 시스템은 한국어 문장을 분석하여 문서 내 모든 문장을 단문으로 재구성하는 단문화 과정과 변환 규칙을 이용한 온톨로지 자동 생성 과정의 두 단계로 구성된다. 이러한 시스템은 온라인 쇼핑몰처럼 비슷한 내용을 포함하는 문서가 대다수 존재하고, 문서의 갱신 및 추가가 빈번한 응용 분야에서 매우 유용하게 사용될 수 있다.

• Journal of Information Processing Systems
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• 제18권6호
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• pp.784-793
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• 2022

Grid-connected distributed power generation has been widely used in green energy generation. However, due to the distributed characteristics, distributed power generation is difficult to be dynamically allocated and monitored in the electrical control process. In order to solve this problem, this research combined the Internet of Things (IoT) with the automatic control system of electrical engineering to improve the control strategy of the power grid inverter according to the characteristics of the IoT system. In the research, a connection system of the power grid inverter and the IoT controller were designed, and the application effect was tested by simulation experiments. The results showed that the power grid inverter had strong tracking control ability for current and power control. Meanwhile, the electrical control system of the IoT could independently and dynamically control the three-phase current and power. The given value was reached within 50 ms after the step signal was input, which could protect the power grid from being affected by the current. The overall system could realize effective control, dynamic control and protective control.

• 대한전자공학회논문지
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• 제27권7호
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• pp.1118-1127
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• 1990

In this paper a new test generation method for Domino CMOS logic circuits is proposed. Because the stuck-at type fault is not adequate for Domino CMOS circuits the stuck-open fault, stuck-on fault and bridging fault are considered as fault models. It is shown that the test generation problem of Domino CMOS circuits results in functional block test generation problem. Test set is generated by using the logic minimizer which is a part of logic design system. An algorithm for reduction of test set is described. The proposed test method can be easily applied to various figures of circuits and make it easy to construct automatic test generator in design system. The proposed algorithms are programed and their efficiency is confirmed by examples.