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RISS 인기검색어
- 검색키워드
- 저자 : Beyer J. (검색결과 4 건)
- 무료
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- 유료
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Exploring the Connectome: Petascale Volume Visualization of Microscopy Data Streams
Beyer, J.,Hadwiger, M.,Al-Awami, A.,Won-Ki Jeong,Kasthuri, N.,Lichtman, J. W.,Pfister, H. IEEE 2013 IEEE computer graphics and applications Vol.33 No.4
<P>Recent advances in high-resolution microscopy let neuroscientists acquire neural-tissue volume data of extremely large sizes. However, the tremendous resolution and the high complexity of neural structures present big challenges to storage, processing, and visualization at interactive rates. A proposed system provides interactive exploration of petascale (petavoxel) volumes resulting from high-throughput electron microscopy data streams. The system can concurrently handle multiple volumes and can support the simultaneous visualization of high-resolution voxel segmentation data. Its visualization-driven design restricts most computations to a small subset of the data. It employs a multiresolution virtual-memory architecture for better scalability than previous approaches and for handling incomplete data. Researchers have employed it for a 1-teravoxel mouse cortex volume, of which several hundred axons and dendrites as well as synapses have been segmented and labeled.</P>
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Lee, J. Y.,Alenkov, V.,Ali, L.,Beyer, J.,Bibi, R.,Boiko, R. S.,Boonin, K.,Buzanov, O.,Chanthima, N.,Cheoun, M. K.,Chernyak, D. M.,Choi, J.,Choi, S.,Danevich, F. A.,Djamal, M.,Drung, D.,Enss, C.,Fleisc IEEE 2016 IEEE transactions on nuclear science Vol.63 No.2
<P>A calcium molybdate (CaMoO4) crystal scintillator, with molybdenum enriched in Mo-100 and calcium depleted in Ca-48 ((CaMoO4)-Ca-40-Mo-100), was developed by the Advanced Molybdenum based Rare process Experiment (AMoRE) collaboration to search for a neutrinoless double beta (0 nu beta beta) decay of Mo-100. We are planning to use about 10 kg of (CaMoO4)-Ca-40-Mo-100 crystals as cryogenic bolometers for the first phase of the experiment (AMoRE-I) at the Yang Yang underground laboratory (Y2L) in Korea. This experiment calls for an extremely low level of radioactive contamination in detectors, particularly by thorium, uranium, and radium decay chains. We measured scintillation properties and radioactive contamination of CaMoO4 and (CaMoO4)-Ca-40-Mo-100 crystals at the Y2L. We also estimated the acceptable level of internal radioactive background using Monte Carlo simulation for the AMoRE-I.</P>
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Hadwiger, M.,Beyer, J.,Won-Ki Jeong,Pfister, H. IEEE 2012 IEEE transactions on visualization and computer gr Vol.18 No.12
<P>This paper presents the first volume visualization system that scales to petascale volumes imaged as a continuous stream of high-resolution electron microscopy images. Our architecture scales to dense, anisotropic petascale volumes because it: (1) decouples construction of the 3D multi-resolution representation required for visualization from data acquisition, and (2) decouples sample access time during ray-casting from the size of the multi-resolution hierarchy. Our system is designed around a scalable multi-resolution virtual memory architecture that handles missing data naturally, does not pre-compute any 3D multi-resolution representation such as an octree, and can accept a constant stream of 2D image tiles from the microscopes. A novelty of our system design is that it is visualization-driven: we restrict most computations to the visible volume data. Leveraging the virtual memory architecture, missing data are detected during volume ray-casting as cache misses, which are propagated backwards for on-demand out-of-core processing. 3D blocks of volume data are only constructed from 2D microscope image tiles when they have actually been accessed during ray-casting. We extensively evaluate our system design choices with respect to scalability and performance, compare to previous best-of-breed systems, and illustrate the effectiveness of our system for real microscopy data from neuroscience.</P>
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Development of Industrial-Scale Fission 99Mo Production Process Using Low Enriched Uranium Target
이승곤,Gerd J. Beyer,이준식 한국원자력학회 2016 Nuclear Engineering and Technology Vol.48 No.3
Molybdenum-99 (99Mo) is the most important isotope because its daughter isotope,technetium-99m (99mTc), has been the most widely used medical radioisotope for morethan 50 years, accounting for > 80% of total nuclear diagnostics worldwide. In this review,radiochemical routes for the production of 99Mo, and the aspects for selecting a suitableprocess strategy are discussed from the historical viewpoint of 99Mo technology developments. Most of the industrial-scale 99Mo processes have been based on the fission of235U. Recently, important issues have been raised for the conversion of fission 99Mo targetsfrom highly enriched uranium to low enriched uranium (LEU). The development of newLEU targets with higher density was requested to compensate for the loss of 99Mo yield,caused by a significant reduction of 235U enrichment, from the conversion. As the dramaticincrement of intermediate level liquid waste is also expected from the conversion, aneffective strategy to reduce the waste generation from the fission 99Mo production isrequired. The mitigation of radioxenon emission from medical radioisotope productionfacilities is discussed in relation with the monitoring of nuclear explosions and comprehensivenuclear test ban. Lastly, the 99Mo production process paired with the Korea AtomicEnergy Research Institute's own LEU target is proposed as one of the most suitable processesfor the LEU target.
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