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Development of FlexRay Module based on the AUTOSAR (AUTOSAR 기반의 FlexRay 모듈 개발)

  • Ju, Hong-Taek;Jeong, Seol-Young;Lee, Myung-Suk
    • The KIPS Transactions:PartC
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    • v.16C no.6
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    • pp.747-752
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    • 2009
  • The AUTOSAR(AUTOmotive Open System ARchitecture) is an open software platform for automotive. The AUTOSAR contains the modules of FlexRay that is the next generation automotive network protocol. We have developed the modules including FlexRay State Manager, FlexRay Transport, FlexRay Interface, FlexRay Transceiver Driver and FlexRay Driver based on the standard of the module. This thesis presented not only the result of development but the result of design and implementation. And the developed modules were ported to the microcontroller board and verified.

Ray Parenchyma and Ray Tracheid Structure of Four Korean Pine Wood Species

  • Ahmed, Sheikh Ali;Chong, Song-Ho;Chun, Su-Kyoung;Park, Byung-Su
    • Journal of the Korea Furniture Society
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    • v.17 no.4
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    • pp.101-107
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    • 2006
  • To know the structural difference between the ray parenchyma and ray tracheid among Pinus densiflora, Pinus rigida, Pinus koraiensis and Larix kaempferi, an observation was carried out under the FE-SEM. The longest ray parenchyma and ray tracheid were found in Pinus koraiensis species while the shortest ray tracheid and ray parenchyma were found in Pinus densiflora and Larix kaempferi. Larix kaempferi had more than one endwall pit in its ray parenchyma. Pinus densiflora was found highest in the pit aperture diameter in ray tracheid and aperture diameter in the cross-field pit. The pit border width in ray tracheid and lumen diameter of ray parenchyma were found highest in Pinus rigida. The cell wall thickness of ray parenchyma and pit aperture diameter in endwall pit of ray tracheid were found highest in Pinus koraiensis compared to other species.

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Development and Characteristics of the Soft x-ray transmission W-target tube (W-target 투과 양극형 Soft x-ray tube의 개발 및 특성분석)

  • Kim, Sung-Soo;Kim, Do-Yun
    • Journal of the Korean Vacuum Society
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    • v.16 no.4
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    • pp.305-310
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    • 2007
  • The x-ray transmission W-target tube was developed and its characteristics were evaluated. The continuous x-ray was emitted at the tube voltage less than 12kV, and the characteristic x-ray was emitted more than 12kV. From the measurement of the energy distribution and dose of x-ray, it was confirmed that our results are a good agreement with the blown ones. Moreover, in comparison with commercial x-ray tube, it was also found that the characteristics of our x-ray tube is better than the commercial one. Therefore we confirmed that the x-ray tube developed in this study is so good that it can be commercialized.

Development of X-ray PIV System Using a Medical X-ray Tube (임상용 X-선관을 이용한 X-ray PIV시스템의 개발)

  • Yim, Dae-Hyun;Kim, Guk-Bae;Kim, Do-Il;Lee, Hyong-Koo;Lee, Sang-Joon
    • 유체기계공업학회:학술대회논문집
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    • 2006.08a
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    • pp.403-406
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    • 2006
  • A new medical X-ray PIV technique was developed using a conventional medical X-ray tube. To acquire images of micro-scale particles, the X-ray PIV system consists of an x-ray CCD camera with high spatial resolution, and a X-ray tube with small a focal spot. A new X-ray exposure control device was developed using a rotating disc shutter to make double pulses which are essential for PIV application. Synchronization methodology was also developed to apply the PIV technique to a conventional medical X-ray tube. In order to check the performance and usefulness of the developed X-ray PIV technique, it was applied to a glycerin flow in an opaque silicon tube. Tungsten particles which have high X-ray absorption coefficient were used as tracer particles. Through this preliminary test, the spatial resolution was found to be higher than ultrafast MRI techniques, and the temporal resolution was higher than conventional X-ray PIV techniques. By improving its performance further and developing more suitable tracers, this medical X-ray PIV technique will have strong potential in the fields of medical imaging or nondestructive inspection as well as diagnosis of practical thermo-fluid flows.

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Detection Probabilities of the X-ray Point Sources in X-ray Extended Sources

  • Kim, Min-Sun;Kim, Eun-Hyeuk
    • The Bulletin of The Korean Astronomical Society
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    • v.35 no.2
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    • pp.33.2-33.2
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    • 2010
  • Galaxy clusters are known to be very bright in X-ray and contain a large number of X-ray point sources within the X-ray emission. However, due to the fluctuations of the X-ray emission, it is very difficult to detect faint X-ray sources and to extract accurately the photometric properties of the X-ray point sources in galaxy clusters. In addition, the most X-ray telescopes show spatially varying point spread function (PSF) and suffer from severe vignetting. The Chandra Archival Survey of Galaxy Clusters project is a wide-area ($\sim40deg^2$) survey of serendipitous Chandra X-ray sources in galaxy cluster fields, containing ~58,000 X-ray point sources in ~800 Chandra ACIS observations of ~600 galaxy clusters. This project aim to investigate the density environmental effects on the physical properties of the X-ray point sources, comparing physical properties of the X-ray point sources in galaxy clusters to those in typical fields. To utilize the sensitivity and detection probability of the X-ray point sources in galaxy clusters, we perform extensive Monte-Carlo simulations. In this poster, we compare the detection probability of the X-ray point sources in galaxy clusters to that of typical fields, and discuss quantitatively the difference between them.

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Design and Implementation of a FlexRay-CAN gateway for Real-Time Control (실시간 제어를 위한 FlexRay-CAN 게이트웨이 설계 및 구현)

  • Park, JeongHoon;Moon, Chan-Woo
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.14 no.2
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    • pp.53-58
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    • 2014
  • As the amount of data between ECUs has increased, the FlexRay consortium proposed FlexRay network system which has larger bandwidth than CAN. But because of implementation cost, CAN and FlexRay hybrid network with FlexRay-CAN gateway will make up the largest part of in-vehicle networks for the present. In this paper, a FlexRay-CAN gateway for a real time feedback control system is implemented, and a data packing algorithm is presented. Finally, a real control experiment with multi-motor system is conducted to verify the proposed gateway system.

Immunostimulating Effects of Angelica Gigas by Radio-Protective (당귀의 방사선 방호에 의한 생체면역 증진 효과)

  • Kim Kyung-Yoon;Jeong Hyun-Woo;Kim Gye-Yeop
    • Journal of Physiology & Pathology in Korean Medicine
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    • v.19 no.5
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    • pp.1256-1260
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    • 2005
  • The purpose of this study was to investigate the effects of Angelica gigas on jejunal survival, endogenous spleen colony formation and jejunal crypt cells of mice irradiated with Gamma-ray irradiation. The subject of this study includes 42 mice which were divided into each 7 groups. Angelica gigas experiment groups were Angelica gigas + Gamma-ray(10Gy), Angelica gigas + Gamma-ray(3Gy), Angelica gigas. Gamma-ray(1 Gy), Gamma-ray control (10Gy), Gamma-ray control(3Gy), Gamma-ray control(1Gy), Normal groups. In the present study to evaluate the effect of Angelica gigas on jejunal crypt survival, endogenous spleen colony formation, and apoptosis in jejunal crypt cells of mice Gamma-ray with each dose of Gamma-ray irradiation. The results of this study were as follows: In low-dose(1Gy) Gamma-ray radiation were treatment of Angelica gigas showed significantly increased(p<0.05) on the cell death apoptosis in crypt, intestine crypts survival of intestine after gamma-ray irradiation. High-dose(10Gy) Gamma-ray, treatment of Angelica gigas showed significantly increased(p<0.05) on the leukocyte. The above results suggest that Angelica gigas were immunostimulating effectively reduced Gamma-ray irradiation.

Implementation and Simulation of 2D Ray-tracing Technique in Multiple-wall Indoor Environment (다중 벽면 구조의 실내 환경에서 2차원 광선추적법 구현 및 시뮬레이션)

  • Jeong, Seung-Heui;Kang, Chul-Gyu;Oh, Chang-Heon
    • Journal of Digital Contents Society
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    • v.8 no.4
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    • pp.459-465
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    • 2007
  • In this paper, we implemented a ray-tracing simulator with a ray-launching technique and generated the propagation path of each ray in a multiple-wall indoor environment. In this simulator, we adopted two dimension ray-tracing techniques considering the reflection and penetration were dominant propagation factor in the indoor channel. From the result, we verified that this ray-tracing simulator shows the similar path pattern and delay distribution with the experiment results of the previous research. Especially, impulse responses of the ray were corresponding to reference result in non-line of sight of multiple-wall indoor environment. Furthermore, we confirmed that channel profiles having respectively different departure angle 1 degree to 7 degree were similar between them.

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A Comparative Study on Output of Four Type Diagnostic X-ray Equipments (정류방식에 따른 진단용 X-선 장치의 출력비교)

  • Kim, Jung-Min
    • Journal of radiological science and technology
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    • v.20 no.2
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    • pp.34-43
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    • 1997
  • There are 4 types of equipment in diagnostic radiography. These are single phase, three phase, inverter type and condenser type X-ray generators. It is very confusing to make an adequate exposure factor and to know the usage of different type of X-ray generators. In this experiment, I explored a comparative study of outputs in 4 different type of X-ray units. I expect that this experiment could be helpful for manufacturer to make both the X-ray equipment better, In terms of Ideal exposure factors, thereby reducing the patient dose. Experimental results are as follow : 1) X-ray output The ratio of X-ray output of single, three phase and inverter type of X-ray generator was 1 : 1.6 : 2 without absorber and 1 : 2 : 2.6 with 20 mm aluminium absorber. 2) Beam quality The X-ray beam quality of single phase generator was proved to be softer than three phase and inverter type of generators by 0.4 mmAL and 0.55 mmAl HVL respectively. 3) Reproducibility Linearity of X-ray output Retroducibility of X-ray output met the regulation below CV 0.05 and linearity also met the regulation below 0.1 in 4 types of diagnostic X-ray generators. 4) The comparison of incident dose Three phase X-ray generator was 20% higher than two other X-ray generators in radiation dose to make same film density.

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A Study on the Scattered-ray Content in Transmitted-ray (산란선함유율(散亂線含有率)에 관(關)한 연구(硏究))

  • Kim, Chang-Kyun;Huh, Joon
    • Journal of radiological science and technology
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    • v.6 no.1
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    • pp.81-84
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    • 1983
  • Scattered-rays are produced from objects in x-ray diagnosis and the quality of x-ray image is influenced by presence of the scattered-ray. Therefore, constant ways and means to suppress and to eliminate the scattered-ray were devised. Authors made an experimental study on the scattered-ray content in transmitted-ray using acryl phantoms and obtained the results as follows: 1. The scattered-ray content in transmitted-ray is not influenced by filtration and tube voltage. 2. Irradiated field size and the thickness of object are a potent influence to scattered-ray content.

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