• 정보처리학회논문지C
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• 제16C권6호
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• pp.747-752
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• 2009

AUTOSAR는 자동차용 공개 소프트웨어 플랫폼으로서 차세대 자동차용 네트워크 표준인 FlexRay 모듈을 포함하고 있다. 본 연구는 AUTOSAR 규격을 기반으로 FlexRay 기본 소프트웨어 모듈들인 FlexRay State Manager, FlexRay Transport, FlexRay Interface, FlexRay Transceiver Driver, FlexRay Driver 모듈들을 개발하였다. 또한 개발 과정에서 얻은 설계와 구현 방법을 함께 제시하고, 개발된 모듈들을 마이크로컨트롤러에 탑재하여 동작을 검증하였다.

• 한국가구학회지
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• 제17권4호
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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.

• 한국진공학회지
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• 제16권4호
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• pp.305-310
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• 2007

W-target 투과양극형 x-ray tube를 개발하고, 특성을 조사하였다. 관전압이 12kV이하에서는 연속 x-ray만 방출되었고, 12kV 이상에서부터 특성 x-ray가 관측되었다. 연속 x-ray와 특성 x-ray의 에너지 분포 및 선량 특성을 조사한 결과 알려진 결과와 잘 일치함을 알 수 있었다. 또한 상용화된 제품과의 비교에서, 기존 제품 이상의 성능을 가질 수 있음을 확인하였다. 따라서 본 연구에서 개발된 x-ray tube는 상용화할 수 있을 만큼 충분히 우수한 특성을 가지고 있음을 확인하였다.

• 유체기계공업학회:학술대회논문집
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• 유체기계공업학회 2006년 제4회 한국유체공학학술대회 논문집
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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.

• 천문학회보
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• 제35권2호
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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.

• 한국인터넷방송통신학회논문지
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• 제14권2호
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• pp.53-58
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• 2014

차량 내 ECU간의 데이터가 많아지면서 기존의 CAN방식보다 넓은 대역폭을 갖는 통신방식인 FlexRay 네트워크 시스템이 FlexRay 컨소시엄을 중심으로 제안되었다. 그러나 FlexRay 부품의 수급이나 구현 비용 등의 문제로 당분간은 FlexRay-CAN 게이트웨이를 사용한 FlexRay와 CAN의 혼재 네트워크 시스템이 사용될 것으로 예측된다. 본 논문에서는 다중모터 시스템을 대상으로 실시간 제어를 위한 FlexRay-CAN 게이트웨이를 구현하고 제어 데이터의 구성방법을 제시하며, 제안한 게이트웨이와 다중모터시스템을 이용하여 실시간 제어 실험을 수행한다.

• 동의생리병리학회지
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• 제19권5호
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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.

• 디지털콘텐츠학회 논문지
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• 제8권4호
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• pp.459-465
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• 2007

본 논문에서는 다중 벽면 구조의 실내 환경에서 전파의 전달특성을 모델링하기 위해 ray-launching 기반의 광선추적법을 이용한 2차원 ray-tracing 시뮬레이터를 구현하였고, 이를 통해 ray의 전파 경로를 분석하고 평가하였다. 실험 결과, 구현된 광선추적법의 경로 패턴 및 시간지연 분포는 동일한 무선 환경에서 수행된 이전의 실험 결과와 비슷한 결과가 나타남을 확인하였으며, 송수신 거리 및 방사각에 따른 수신반경의 조정이 타당함을 확인하였다. 특히 비가시거리 송수신 환경에서 다중 벽면을 투과한 ray가 반사와 투과를 형성하여 수신기에 도달할 때까지의 ray의 impulse response는 기존 연구의 실험 결과와 대부분 일치하였으며, 송신기에서 발사되는 ray의 방사각을 $1^{\circ}$에서 $7^{\circ}$까지 달리하여 실험한 경우 도출된 channel profile이 서로 유사함을 확인하였다.

• 대한방사선기술학회지:방사선기술과학
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• 제20권2호
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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.

• 대한방사선기술학회지:방사선기술과학
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• 제6권1호
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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.