Earticle

For the vertical and horizontal dual 5-axis system of a new turning-milling compound machining center, the dedicated post processor for 5-axis is developed by C++ programming language, B-axis pendulum angle error measurement technology and nonlinear error compensation algorithm are studied; and also analyzed and verified in actual processing; Researches show that: the dual 5-axis post processor works correctly and efficiently, better processing accuracy than 0.05mm can be obtained by nonlinear interpolation compensation for B-axis pendulum angle for 3 times, which meets the demand of crafts machining.

This study deals with the method of post-processing in the automatic tool path generation for 5-axis NC machining. The 5-axis NC machining cannot only cope with the manufacturing of complicated shapes, but also offers numerous advantages such as reasonable tool employment, great reduction of set-up process and so on. Thus 5-axis NC machining has been used fur aircraft parts, mold and die as well as for complicated shapes such as impeller, propeller and rotor. However, most of the present CAM systems for 5-axis NC machining have limited functions in terms of tool collision, machine limits and post-processing. Especially 5-axis machine configurations are various according to the method which the rotational axes are adapted with the table and spindle. For that reason, in many cases the optimal numerical control (NC) data cannot be obtained or considerable time is consumed. To solve this problem, we applied a general post-processor fur 5-axis NC machining. The validity of this post-processor should be experimentally confirmed by successfully milling to a helix shaped workpiece.

When caught in a fire inside a building or a tunnel the generated smoke is the main cause of the bad visibility, which makes difficult for a person to find escape route. Therefore it is required to visualize the simulated results of smoke realistically from a viewpoint of a person caught in a fire. In the present study, demonstrated is a CFD post-processor which can visualize the objects through smoke from the results of CFD fire simulation.

Handy paint rollers with simple or no patterns are generally used to transcribe its design to a wall just after painting. However, the types of the patterns are limited to several conventional ones, so that interior planners' or decorators' demands are gradually tending to getting attractive roller designs. In order to obtain abundant kinds of the roller designs, a new advanced 3D machining method should be established for cylindrical models. In this paper, a post-processor that can generate suitable NC data is proposed for multi-axis NC machine tools with a rotary unit. The 3D machining system with the post-processor is also presented for an attractive interior decorating. The machining system allows us to easily transcribe the relief designs from on a flat model to on a cylindrical model. The effectiveness of the proposed 3D machining system using the post-processor is demonstrated through some machining experiments.

This study deals with the method of post-processing in the automatic tool path generation for 5-axis NC machining. The 5-axis NC machining cannot only cope with the manufacturing of complicated shapes, but also offers numerous advantages such as reasonable tool employment, great reduction of set-up process and so on. Thus 5-axis NC machining has been used for aircraft parts, mold and die as well as for complicated shapes such as impeller, propeller and rotor. However, most of the present CAM systems for 5-axis NC machining have limited functions in terms of tool collision, machine limits and post-processing. Especially 5-axis machine configurations are various according to the method which the rotational axes are adapted with the table and spindle. For that reason, In many cases the optimal numerical control (NC) data cannot be obtained or considerable time is consumed. To solve this problem, we applied a general post-processor for 5-axis NC machining. The validity of this post-processor should be experimentally confirmed by successfully milling to a helix shaped workpiece.

A pre/post processor program based GUI(Graphic User Interface) by using the MFC and OpenGL library in the Windows OS have been developed for the analysis of the passenger flow. Using this program, users are able to generate and modify the meshes of multi-storied subway station, set all the parameters for the solver, and obtain the results of the simulation such as transient passenger motions and passenger streak lines in 3-dimensional graphic view.

언어를 컴퓨터로 처리하기 위한 방법으로 격문법(Case Grammar)을 사용하는 것이 있다. 격문법은 동사에 대한 격틀(Case Frame)을 기술함으로써 그 동사와 의미적으로 관계를 가지는 명사들에 대해 표현하는 것이다. 따라서 이러한 격 문법을 사용하기 위해서는 동사에 대한 격틀을 기술하는 것이 필수 과제이다. 본 연구에서는 동사에 대한 격틀을 기술하기 위해서 말뭉치에서 직접 사용된 명사-조사 쌍과 동사를 추출하여 이들의 격관계를 결정하고 이 자료들을 모두 동사의 격틀 정보로 사용하였다 이렇게 구축된 격틀 자료를 구문분석의 후처리 단계에 적용하여 구문분석 결과 잘못된 명사-조사 쌍 의존관계를 수정하였다.

Performance-Based Seismic Design (PBSD) is an approach that evaluates how structures will perform under different levels of seismic activity. It focuses on ensuring that buildings not only withstand earthquakes but also meet specific performance objectives, such as minimizing damage or maintaining functionality after the event. Unlike traditional methods, PBSD allows for more tailored, cost-effective designs by considering varying degrees of acceptable damage based on the structure's importance and use. PBSD was introduced in Korea in 2016 to replace elastic design, which is inevitable to over-design to cope with all variables such as earthquakes and winds. When PBSD is applied to the structural design new building, One of the challenges of PBSD is the complexity involved in creating accurate inelastic analysis models. The process requires significant time and effort to analyze the results, as it involves detailed simulations of how structures will behave under seismic stress. Additionally, organizing and interpreting the analysis data to meet performance objectives can be labor-intensive and technically demanding. In order to solve this problem, a post-processor program was developed in this study. A post-processor was developed based on Excel program using Visual Basic for Applications(VBA). Because analysis outputs of Perform-3D, that is a commercial software for structural analysis and design, are very complicated, generation of tables and graphs for report is significant time and effort consuming task. When the developed post-processor is used to make the seismic design report, the required task time is significantly reduced.

CAFPlot has been developed for visualizing a wide range of technical data. It offer 2D and 3D plot in a variety of formats.

A GUI based pre/post processor program, which is based on the MFC and OpenGL library in the Windows O/S, hee been developed for NUFLEX Using this program, users are able to generate and modify structured or unstructured grid geometries, set all the parameters for the solver, and observe the results of the simulation in graphic view by vector or scalar plots. The mesh geometry data can be imported from or exported to other programs by supporting functions for reading from and writing to CGNS data format files.

분포형 수문모형인 WEP(Water and Energy transfer Processes)는 일본토목연구소의 물순환 해석 모형으로써, 짧은 구동시간에도 불구하고 물과 열에너지의 순환을 파악하는 데 효과적인 것으로 알려져 있다, 그러나 모의에 필요한 자료입력 과정이 매우 복잡하고 불편할 뿐 아니라 획득된 결과를 효율적으로 표현하지 못한다는 약점을 가지고 있어 활용도가 높지 않았다, WEP 사용성 향상에 관한 요구가 높아짐에 따라, WEP 전 후처리 프로그램인 WEP+가 개발되었다. WEP+의 개발은 WEP 모형에 대한 방대한 양의 입력 자료를 효과적으로 구축하고, 다양한 기능을 통해 모의 결과에 대한 분석을 용이하게 할 수 있도록 하여 사용자가 직관적으로 모형을 적용할 수 있도록 하는데 그 목적을 두고 있다. WEP+는 기존 WEP의 복잡한 입력과정을 체계화 하여, 사용자가 쉽게 접근할 수 있도록 설계되었으며, 입력 자료의 편집기능을 도입하였다. 또한 복잡하게 연관된 매개변수들의 적합성 여부를 사전에 점검 할 수 있는 기능을 부여하여 모의 도중 오류가 발생하거나 잘못된 모의 결과를 생산할 가능성을 최소화 하고자 하였다. 모의 결과에 대해서는 하천 유출, 지표면 유출, 지하수 유출, 토양수분, 지하수위, 증발산 등 세부 수문요소에 대한 모의 결과를 지점별 시계열과 전체 유역에대한 분포형 자료로 확인할 수 있다. 본 연구에서는 새로 개발된 WEP+ 각 모듈의 기능과 인터페이스를 살펴보고 적용사례를 중심으로 결과분석과 활용방법에 대해 고찰해 보도록 한다.

In the present study a pre/post-processor program has been developed to be used with a general CFD code. This program is capable of performing the basic functions of the pre/post-processing, which include mesh generation and post processing plots. Also through perspective projection, this program can be used to check the quality of generated mesh by moving around inside the mesh. The smoke visualization can be also performed with the present program to visualize the smoke behavior in the case of fire simulation. The examples of the program execution are given in paper.

Power system fault analysis has been based on symmetrical component method, which describes power system elements by positive, negative and zero sequence impedance. Obtaining accurate line impedances as possible are very important for estimating fault current magnitude and setting distance relay accurately. Especially, accurate calculation of zero sequence impedance is important because most of transmission line faults are line-to-ground faults, not balanced three-phase fault. Since KEPCO has started measuring of transmission line impedance at 2005, it has been revealed that the measured and calculated line impedances are well agreed within reasonable accuracy. In case of underground transmission lines, however, large discrepancies in zero sequence impedance were observed occasionally. Since zero sequence impedance is an important input data for distance relay to locate faulted point correctly, it is urgently required to analyze, detect and consider countermeasures to the source of these discrepancies. In this paper, development of pre/post processor to ATP (Alternative Transient Program) version of EMTP (Electro-Magnetic Transient Program) for sequence impedance calculation was described. With the developed processor ATP-cable, effects of ground resistance and ECC (Earth Continuity Conductor) on sequence impedance were analyzed.

In structural analysis using FEM or BEM, pre_ and post_processor is necessary pre_ and post_processor and analyzer use same structural model. But many other tasks related to structural design, such as optimization, design of layout, etc, do not share that model in spite of their resemblance of requiring data. So, a pre_ and post_ processor was developed using a relational database managing system. Developed system uses the DBMS as a data storage and interacts with it using SQL interface. In this way, many other tasks that uses same structural data can be developed.

본 논문에서는 잡음에 강건한 적응 알고리즘을 이용하여 음향 반향을 제거하고 추정 오타 신호와 마이크 입력 신호간의 상관도를 이용한 후처리기로 잔여 반향을 감쇠시킴으로써 통화의 품질을 향상시키는 음향반향 제거기를 ADSP-2181을 이용하여 구현하였다. 제안하는 음향 반향제거기는 기존의 적응 필터를 이용한 음향 반향 제거기예 비해 계산량이 크게 종가하지 않으면서 잔여 반향을 제거하여 통화 품질을 개선하며, 감쇠기를 통과함으로써 원래 신호가 왜곡이 되는 현상을 방지하기 위하여 두 개 의 문턱치를 사용하여 후처리 여부를 결정하여 신호의 왜곡을 막아준다. 그리고 16 비트 고정 소수점 DSP를 이용한 실험 결과를 통하여 잡음에 강건한 적응 알고리즘이 동시 통화 상황에서도 우수하게 동작하고, 수렴 속도도 NLMS 알고리즘에 떨어지지 않음을 보았다. 그리고 후처리기를 사용함으로써 ERLE가 평균 20 dB 이상 향상되었다. 그리고 제안하는 후처리기를 사용하는 반향 제거기의 출력이 기존 후처리기를 통과한 출력보다 신호의 왜곡이 줄어 기존의 음향 반향 제거기에 비해서 성능이 향상됨을 보였다.

In this paper, an acoustic echo canceller(AEC) is implemented by ADSP-2181. This AEC uses a noise robust adaptive algorithm and a postprocessing method which attenuates residual echo using cross-correlation between estimated error signal and microphone input signal. We propose new postprocessing method that uses two thresholds to prevent signal distortion after postprocessing and to improve the performance of AEC without extra computational burden. Through experiments using a 16 bit fixed-point DSP board (ADSP-2181 EZ-KIT Lite board), it is shown that the noise robust adaptive algorithm performs well in the double-talk situations and the convergence speed is comparable to NLMS. Using the postprocessor, ERLE is improved about 20 dB. As a result, the AEC with a postprocessor shows better performance than conventional ones.

The programmable logic controller(PLC) programming has been manually carried out, which might cause the productivity decrease by omission and repetition of instruction. Recently, the knowledge-based automatic programming system is introduced. In the system, input/output(I/O) addresses are input by user. In this study, we developed the prototype system for automatic I/O addressing using knowledge-based technology, With the developed system, the PLC addressing task can he consistently and effectively performed.

셀룰러 신경회로망(CNN)은 일반적인 신경회로망과는 다른 형태의 회로구조를 가진다. 이것은 간단한 처리요소인 셀들의 배열로 이루어져 있으며, 각 셀들은 국부적인 연결특성과 공간불변 템플릿 특성을 갖는다. 본 논문에서는 소규모의 CNN셀 블록을 사용하여 대규모의 입력영상을 블록으로 처리하는 실용적인 시다중화 영상처리 기법을 적용하였다. 그리고, C프로그램과 Matlab모델로 구현된 시뮬레이터를 사용하여 윤곽선 검출 시뮬레이션을 하였다. 또한 5$\times$5 CNN 하드웨어와 전ㆍ후 처리기를 설계하여 시험중에 있다.

The cellular neural networks have the circuit structure that differs from the form of general neural network. It consists of an array of the same cell which is a simple processing element, and each of the cells has local connectivity and space invariant template property. In this paper, time-multiplex image processing technique is applied for processing large images using small size CNN cell block, and we simulate the edge detection of a large image using the simulator implemented with a c program and matlab model. A 5$\times$5 CNN hardware and pre post processor is also implemented and is under test.