• 제목/요약/키워드: post data processing

검색결과 558건 처리시간 0.026초

3D numerical simulation of temperature on Pilot tube

  • Ying Wang;Baogeng Ding
    • 한국전산유체공학회:학술대회논문집
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    • 한국전산유체공학회 2006년도 PARALLEL CFD 2006
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    • pp.248-251
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    • 2006
  • Multi-physics problem is considered for the Pitot tube located in uniform freon gas flow with high Mach number and the 3D numerical results of temperature on Pitot tube is given. The model is created by using structural module of ANSYS, the grids are obtained by ICEM, and the problem is solved and the data post-processing is done by CFX.

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고속철도 시운전시험 및 평가용 측정시스템 개발(II) - 소프트웨어 (Development of Measuring System for On-Line Test and Evaluation of High Speed Rail(II) - Software)

  • 김석원;김진환;최강윤;박찬경;김기환
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2002년도 추계학술대회 논문집(I)
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    • pp.174-181
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    • 2002
  • In this paper, we introduce the software of the measuring system for on-line test and evaluation of high speed rail. This software should set and control the hardware of the measuring system, perform the analysis and calculation of measuring data and interface between users and the measuring system. For this purpose, three programs, such as a measuring program, a monitoring program and post-processing program, have developed.

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입체적인 데이터에서 애매성-프리 표면 재구성 (An Ambiguity-free Surface Construction from Volume Data)

  • 이의택;오광만;박규호
    • 한국컴퓨터그래픽스학회논문지
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    • 제4권1호
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    • pp.55-66
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    • 1998
  • This paper presents a simple method for relieving the ambiguity problems within the sub-voxel based surface-fitting approach for the surface construction. ECB algorithm is proposed to avoid the ambiguity problem which is the root of the holes within the resulting polygon based approximation. The basic idea of our disambiguation strategy is the use of a set of predefined modeling primitives (we call SMP) which guarantees the topological consistency of resulted surface polygons. 20 SMPs are derived from the extension of the concept of the elementary modeling primitives in the CB algorithm [3], and fit one to five faces of them to the iso-surface crossing a cell with no further processing. A look-up table which has a surface triangle list is pre-calculated using these 20 SMPs. All of surface triangles in the table are from the faces of SMPs and are stored in the form of edge list on which vertices of each surface triangle are located. The resulted polygon based approximation is unique at every threshold value and its validity is guaranteed without considering the complicated problems such as average of density and postprocessing. ECB algorithm could be free from the need for the time consuming post-processing, which eliminates holes by revisiting every boundary cell. Through three experiments of surface construction from volume data, its capability of hole avoidance is showed.

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광센서를 이용한 지문인식 시스템의 구현에 관한 연구 (A Study on Implementation of Finger-Print Identification System Using Optical Sensor)

  • 신기봉;정경훈;강동욱;김기두
    • 한국방송∙미디어공학회:학술대회논문집
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    • 한국방송공학회 2005년도 학술대회
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    • pp.67-69
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    • 2005
  • 지문인식 시스템이란 저장되어서 가지고 있는 지문data와 지금 현재sensor로 입력받은 지문data의 유사도를 측정하는 system이다. 현 시대의 보안에 관한 요구가 많아지면서, 개인password나PIN(Personal Identification Number)같이 외워서 사용해야만 하는 불편함이 없고, 본인임을 쉽게 증명할 수 있는 생체정보를 이용한 ID system이 각광을 받고 있다. 이러한 상황 속에서 가장 손쉽게 접할 수 있는Finger-print Identification system을 구현할 것이다. 지문인식 시스템은 sensor의 방식에 따라 여러가지로 분류되는데, 본 논문에서는 광학방식 센서를 이용한 지문인식 시스템을 구현 하였다. 본 지문인식 시스템은 처음 지문영상을 센서로 입력 받고 그 입력된 영상을 전처리(pre-processing)해서 지문의 특징점을 추출한다. 이렇게 특징점들을 획득한 후, 후처리(post-processing)과정을 거쳐서 database에 저장 한다. 이렇게 지문영상의database를 구성한 후, 비교하고자 하는 지문영상을 센서로 입력 받아 지문영상을 획득할 때와 같은 processing과정을 거치고, 그 결과물과 database에 저장되어있는 지문과 1:N matching을 한다. 이렇게 해서 유사한 지문영상을 유사도에 따라 출력한다.

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경찰관의 외상성 사건 경험이 외상후 스트레스 증상에 미치는 영향에 있어 스트레스 대처양식의 매개효과 (The Mediating Effect of Stress Management Format on Influence Over Post Traumatic Stress Disorder on Traumatic Case Experience of Police Officers)

  • 양경미;오창홍;박정환
    • 한국산학기술학회논문지
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    • 제16권1호
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    • pp.116-128
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    • 2015
  • 본 연구의 목적은 외상성 사건 경험이 외상 후 스트레스 장애에 미치는 영향에 있어서 스트레스 대처양식의 매개효과를 알아보고자 하는데 있다. 연구목적을 달성하기 위해 제주지역 경찰관서 4개소에서 경찰관을 대상으로 총 297명의 사례를 분석하였다. 연구가설을 검증하기 위하여 Baron & kenny의 회귀분석 4단계를 거쳐 매개 효과를 검증하였고, Sobel Test를 실시하여 매개효과에 대한 유의도를 검증하였다. 외상성 사건 경험 이후 외상 후 스트레스 장애 증상의 발현 사이의 경로를 확인함으로써 적절한 외상 후 스트레스 장애에 대한 개입 프로그램을 설정하는데 도움을 주고, 궁극적으로 제주지역 경찰관들이 외상 후 스트레스에서 벗어나 긍정적이고 역동적인 근무 환경을 조성하는데 도움을 줄 것이다.

STEP AP214 자동차 설계 데이터 정리 시스템 (Healing of STEP AP214 Automotive CAD Data)

  • 양정삼;한순흥
    • 한국CDE학회논문집
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    • 제7권3호
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    • pp.170-176
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    • 2002
  • To exchange CAD data between heterogeneous CAD systems, we generally use a neutral format especially STEP, which is the international standard (ISO-10303) for product model data exchange. AP214 (Application Protocol) for the automotive industry not only takes into account geometry and organizational data, but also provides a classification mechanism for product modeling. When reading a STEP file during a design process that is exported from other CAD systems, it is a burden to a designer to go through the tedious process of removing duplicate or non-manifold entities, adjusting parts, and rearranging text. We analyze the structure of AP214 and develop a healing tool to solve the following problem. Without the assembly information in the Master workspace of CATIA, or to read a STEP file from Pro/Engineer, a designer should do a repetitive process of disintegrating an assembly into parts one by one. We have developed a post-processing tool for STEP AP214 that separates out a part from an assembly model and adjusts superfluous or useless entities using the ACIS kernel.

Effect of rinsing time on the accuracy of interim crowns fabricated by digital light processing: An in vitro study

  • Lee, Beom-Il;You, Seung-Gyu;You, Seung-Min;Kang, Seen-Young;Kim, Ji-Hwan
    • The Journal of Advanced Prosthodontics
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    • 제13권1호
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    • pp.24-35
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    • 2021
  • PURPOSE. This study was to evaluate the effect of rinsing time on the accuracy of interim crowns fabricated by digital light processing. MATERIALS AND METHODS. The maxillary right first molar master die was duplicated using a silicone material, while a study die was produced using epoxy resin. Scans of the epoxy resin die were used in combination with CAD software to design a maxillary right first molar interim crown. Based on this design, 24 interim crowns were fabricated with digital light processing. This study examined the trueness and precision of products that were processed with one of the three different postprocessing rinsing times (1 min, 5 min, and 10 min). Trueness was measured by superimposing reference data with scanned data from external, intaglio, and marginal surfaces. Precision was measured by superimposing the scan data within the group. The trueness and precision data were analyzed using Kruskal-Wallis, nonparametric, and post-hoc tests, and were compared using a Mann-Whitney U test with Bonferroni correction (α=.05). RESULTS. The trueness of the external and intaglio surfaces of crowns varied significantly among the different rinsing times (P=.004, P=.003), but there was no statistically significant difference in terms of trueness measurements of the marginal surfaces (P=.605). In terms of precision, statistically significant differences were found among the external, intaglio, and marginal surfaces (P=.001). CONCLUSION. Interim crowns rinsed for 10 minutes showed high accuracy.

그래픽처리장치를 이용한 레이놀즈 방정식의 수치 해석 가속화 (Accelerating Numerical Analysis of Reynolds Equation Using Graphic Processing Units)

  • 명훈주;강지훈;오광진
    • Tribology and Lubricants
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    • 제28권4호
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    • pp.160-166
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    • 2012
  • This paper presents a Reynolds equation solver for hydrostatic gas bearings, implemented to run on graphics processing units (GPUs). The original analysis code for the central processing unit (CPU) was modified for the GPU by using the compute unified device architecture (CUDA). The red-black Gauss-Seidel (RBGS) algorithm was employed instead of the original Gauss-Seidel algorithm for the iterative pressure solver, because the latter has data dependency between neighboring nodes. The implemented GPU program was tested on the nVidia GTX580 system and compared to the original CPU program on the AMD Llano system. In the iterative pressure calculation, the implemented GPU program showed 20-100 times faster performance than the original CPU codes. Comparison of the wall-clock times including all of pre/post processing codes showed that the GPU codes still delivered 4-12 times faster performance than the CPU code for our target problem.

자동 초음파 검사를 위한 결함 영상 처리 시스템의 설계 및 구현 (Design and Implementation of Flaw Image processing System for Automated Ultrasonic Testing System)

  • 김한종;박종훈;김철원
    • 한국정보통신학회논문지
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    • 제14권1호
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    • pp.225-232
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    • 2010
  • 용접부 내에 존재하는 결함의 형태, 위치, 크기 등의 정보를 정량적으로 파악하기 위하여 초음파 탐상 검사가 많이 활용되는데, 최근 들어 용접부의 결함 탐상을 위해, 검사과정을 기계적 스캐너로 자동화한 자동 초음파 탐상 시스템이 많은 산업 분야에서 활용되고 있고, 특히 배관 용접부의 건전성 평가를 위한 비파괴안전진단에서 그 활용 폭이 커지고 있다. 본 논문에서는 배관 용접부의 자동 초음파 검사를 위한 알고리즘 구현과 결함 영상을 보정하여 주는 결함영상 처리 시스템을 설계 및 구현하였다. 적용된 기법으로는 초음파 A-Scan 압축 알고리즘, Synthetic Aperture Focusing 알고리즘, 결함영상증폭 알고리즘과 이와 관련된 소프트웨어 설계 및 구현에 대하여 논한다.

Combination of Array Processing and Space-Time Coding In MC-CDMA System

  • Hung Nguyen Viet;Fernando W. A. C
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 2004년도 ICEIC The International Conference on Electronics Informations and Communications
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    • pp.302-309
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    • 2004
  • The transmission capacity of wireless communication systems may become dramatically high by employ multiple transmit and receive antennas with space-time coding techniques appropriate to multiple transmit antennas. For large number of transmit antennas and at high bandwidth efficiencies, the receiver may become too complex whenever correlation across transmit antennas is introduced. Reducing decoding complexity at receiver by combining array processing and space-time codes (STC) helps a communication system using STC to overcome the big obstacle that prevents it from achieving a desired high transmission rate. Multi-carrier CDMA (MC-CDMA) allows providing good performance in a channel with high inter-symbol interference. Antenna array, STC and MC-CDMA system have a similar characteristic that transmit-receive data streams are divided into sub-streams. Thus, there may be a noticeable reduction of receiver complexity when we combine them together. In this paper, the combination of array processing and STC in MC-CDMA system over slow selective-fading channel is investigated and compared with corresponding existing MC-CDMA system using STC. A refinement of this basic structure leads to a system design principle in which we have to make a trade off between transmission rate, decoding complexity, and length of spreading code to reach a given desired design goal.

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