• Title/Summary/Keyword: Automatic Interpretation

Search Result 84, Processing Time 0.023 seconds

A Study of Feedrate Optimization for Tolerance Error of NC Machining (NC가공에서 허용오차를 고려한 가공속도 최적화에 관한 연구)

  • Lee, Hee-Seung;Lee, Cheol-Soo;Kim, Jong-Min;Heo, Eun-Young
    • Journal of the Korean Society of Manufacturing Technology Engineers
    • /
    • v.22 no.5
    • /
    • pp.852-858
    • /
    • 2013
  • In numerical control (NC) machining, a machining error in equipment generally occurs for a variety of reasons. If there is a change in direction in the NC code, the characteristics of the automatic acceleration or deceleration function cause an overlap of each axis of the acceleration and deceleration zones, which in turn causes a shift in the actual processing path. Many studies have been conducted for error calibration of the edge as caused by automatic acceleration or deceleration in NC machining. This paper describes a geometric interpretation of the shape and processing characteristics of the operating NC device. The paper then describes a way to determine a feedrate that achieves the desired tolerance by using linear and parabolic profiles. Experiments were conducted by the validate equations using a three-axis NC machine. The results show that the machining errors were smaller than the machine resolution. The results also clearly demonstrate that the NC machine with the developed system can successfully predict machining errors induced with a change in direction.

Change Detection Using the IKONOS Satellite Images (IKONOS 위성영상을 이용한 변화 탐지)

  • Kang, Gil-Seon;Shin, Sang-Cheul;Cho, Kyu-Jon
    • Journal of Korean Society for Geospatial Information Science
    • /
    • v.11 no.2 s.25
    • /
    • pp.61-66
    • /
    • 2003
  • The change detection using the satellite imagery and airphotos has been carried out in the application of terrain mapping, environment, forestry, facility detection, etc. The low-spatial resolution data such as Landsat, NOAA satellite images is generally used for automatic change detection, while on the other hand the high-spatial resolution data is used for change detection by image interpretation. The research to integrate automatic method with manual change detection through the high-spatial resolution satellite image is performed. but the problem such as shadow, building 'lean' due to perspective geometry and precision geocorrection was found. In this paper we performed change detection using the IKONOS satellite images, and present the concerning problem.

  • PDF

A Study on the Verification Scheme of SMS Encoding and Decoding Module (SMS 부호화 복호화 모듈 검증 방법에 대한 연구)

  • Choi, Kwang-Hoon
    • Journal of the Korea Society of Computer and Information
    • /
    • v.15 no.6
    • /
    • pp.1-9
    • /
    • 2010
  • This paper proposes a test method for compliance of SMS encoder and decoder modules with 3GPP (3rd Generation Partnership Project) specification on SMS PDU (Protocol Data Unit). The existing tools have focused on providing an SMS gateway and on helping to view and edit a single SMS PDU, which rarely help to resolve the compliance test problem. The proposed compliance test method is based on an automatic generation of SMS PDUs fully compliant with the 3GPP specification by using QuickCheck library written in Haskell. By applying the proposed method to a C-based SMS encoder and decoder in Linux Mobile platform, we have found out several critical bugs such as wrong interpretation of time stamps in BCD format. The automatic SMS PDU generator is reusable in that it only depends on the 3GPP SMS specification. The QuickCheck library is also applicable for testing other network protocol data encoders and decoders, as used in this paper.

Sequence Planning of Machining Features using STEP AP224 (STEP AP224를 이용한 특징 형상의 가공 순서 계획)

  • 강무진
    • Korean Journal of Computational Design and Engineering
    • /
    • v.9 no.2
    • /
    • pp.175-182
    • /
    • 2004
  • As a bridge between design and manufacturing, process planning is to generate a sequenced set of instructions to manufacture the specified part. Automatic interpretation of manufacturing information incorporated in the design documentation such as CAD file has been a knotty subject for manufacturing engineers since no current data exchange format for product data provides a perfect interface between heterogeneous systems. The recent neutral data exchange format STEp, standard for the exchange of product model data, includes not only geometry but also technical and managerial information. STEP AP(Application Protocol) 224 is specifically dedicated to the mechanical product definition for process planning using machining features. Given a design information in STEP AP 224 format, process planning can be made without human intervention. This paper describes a method to determine the sequence of machining features by using the machining features and the manufacturing information expressed in STEP AP224.

The estimation of tool wear and fracture mechanism using sensor fusion in micro-machining (미세형상가공시 센서융합을 이용한 공구 마멸 및 파손 메커니즘 검출)

  • 임정숙;왕덕현;김원일;이윤경
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
    • /
    • 2002.04a
    • /
    • pp.245-250
    • /
    • 2002
  • A successful on-line monitoring system for conventional machining operations has the potential to reduce cost, guarantee consistency of product quality, improve productivity and provide a safer environment for the operator. In fee-shape machining, typical signs of tool problems such as vibration, noise, chip flow characteristics and visual signs are almost unnoticeable without the use of special equipment. These characteristics increase the importance of automatic monitoring in fine-shape machining; however, sensing and interpretation of signals are more complex. In addition, the shafts of the micro-tools break before the typical extensive cutting edge of the tool gets damaged. In this study, the existence of a relationship between the characteristics of the cutting force and tool usage was investigated, and tool breakage detection algorithm was developed and the fellowing results are obtained. In data analysis, didn't use a relative error compare which mainly used in established experiment and investigated tool breakage detection algorithm in time domain which can detect AE and cutting force signals more effective and accurate.

  • PDF

Speckle noise reduction in SAR images using an adaptive wavelet Shrinkage method

  • Kim, Kwang-Yong;Jeong, Soo;Kim, Kyung-Ok
    • Proceedings of the KSRS Conference
    • /
    • 2002.10a
    • /
    • pp.303-307
    • /
    • 2002
  • Although Synthetic Aperture Radar(SAR) is a very powerful and attractive tool, automatic interpretation of SAR images is extremely difficult because of several reason. Spatially, speckle noise reduction in SAR images is important step to interpret the SAR image at the preprocessing step. The speckle noise in SAR images is modeled to be multiplicative, and therefore, a signal-dependent noise. So, it has deflated many image-denoising algorithms that are based on additive noise model. In this paper, we propose an adaptive wavelet shrinkage method for speckle noise reduction in SAR images by analyzing the high frequency level in detail. We first decompose minutely the high frequency level to analyze the noise level. And then, we determine the weighting threshold value per the level, and layer. Finally, using those weighting threshold, we produce the efficient wavelet shrinkage method. So, this method not only reduces the speckle noise, but also preserves image detail and sharpness.

  • PDF

GEOLOGICAL LINEAMENTS ANALYSIS BY IFSAR IMAGES

  • Wu Tzong-Dar;Chang Li Chi
    • Proceedings of the KSRS Conference
    • /
    • 2005.10a
    • /
    • pp.169-172
    • /
    • 2005
  • Modem SAR interferometry (IFSAR) sensors delivering intensity images and corresponding digital terrain model (DTM) allow for a thorough surface lineament interpretation with the all-weather day-night applicability. In this paper, an automatic linear-feature detection algorithm for high-resolution SAR images acquired in Taiwan is proposed. Methodologies to extract linear features consist of several stages. First, the image denoising techniques are used to remove the speckle noise on the raw image. In this stage, the Lee filter has been chosen because of its superior performance. After denoising, the Coefficient of Variation Detector is performed on the result images for edge enhancements and detection. Dilation and erosion techniques are used to reconnect the fragmented lines. The Hough transform, which is a special case of a more general transform known as Radon transform, is a suitable method for line detection in our analysis. Finally, linear features are extracted from the binary edge image. The last stage contains many substeps such as edge thinning and curve pruning.

  • PDF

Recognition and classification of dimension set for automatic input of mechanical drawings (기계 도면의 자동 입력을 위한 치수 집합의 인식 및 분류)

  • 정윤수;박길흠
    • Journal of the Korean Institute of Telematics and Electronics S
    • /
    • v.34S no.11
    • /
    • pp.114-125
    • /
    • 1997
  • This paper presents a method that automatically recognizes dimension sets from the mechanical drawings, and that classifies 6 types dimension sets according to functional purpose. In the proposed method, the object and closed-loop symbols are separated from the character-free drawings. Then object lines and interpretation lines are vectorized. And, after recognizing dimension sets(consistings of arrowhead, shape line, tail lines, extension lines, text-string, and feature control frame), we classify recognized dimension sets as horizontal, vertical, angular, diametral, radial, and leader dimension sets. Finally the proposed method converts classified dimension sets into AutoCAD data by using AutoLisp language. By using the methods of geometric modeling, the proposed method readily recognized and classifies dimension sets from complex drawings. Experimetnal results are presented, which are obtained by applying the proposed method to drawings drawn in compliance with the KS drafting standard.

  • PDF

Investigations about 5 Clinical Cases with Bexel-IRINA Iridoscopy (자동홍체진단기에 의한 임상 진단 사례 5건 고찰)

  • Chi, Gyoo-Yong;Kim, Dae-Hoon;Park, Seong-Il;Lee, Young-Bin
    • Proceedings of the KOSOMBE Conference
    • /
    • v.1997 no.11
    • /
    • pp.305-314
    • /
    • 1997
  • This study was purposed to observe the advantages obtained from iridodiagnostics and automatic iridoscope or oriental medical doctors. In order to study the iridodiagnostics, 5 case-researches were made as the first step. The results were obtained as follows. 1. First of all, the formation of darkening area must be paid attentionally with toxic spot and lacunain relation to the interpretation of present illness. 2. The theoretical concepts about structure in iridodiagnostics and oriental medicine were same. 3. The constitutional type of iridodiagnostics played a important role in concluding the nature and background of symptoms. 4. Most of iris signs reflected the histological changes of body structure equally, and successive study about the difference of visceral scheme between iridology and Oriental Medicine would be needed in the future.

  • PDF

Airac: Static Analyzer for Automatic Verification of Array Index Ranges in C Programs (아이락: C 프로그램의 메모리 오류 정적 분석기)

  • Jung Yungbum;Kim Jaehwang;Shin Jaeho;Yi Kwangkeun
    • Proceedings of the Korean Information Science Society Conference
    • /
    • 2005.11b
    • /
    • pp.964-966
    • /
    • 2005
  • 아이락(Airac)은 C 프로그램의 버퍼오버런(buffer overrun)오류를 찾아주는 정적 프로그램 분석기(static program analyzer)이다. 아이락은 요약해석(abstract interpretation)의 틀 속에서 디자인되었다. 설계 및 구현 과정에서 프로그램 분석 분야에서 축적되어온 다양한 기술들을 적용하여 분석의 성능 및 정확도 향상을 이룩하였다. 아이락은 리눅스 커널(linux kernel), GNU 소프트웨어, 상용 소프트웨어등에 적용되어 오류를 찾아냈다.

  • PDF