Objective: The aim of this survey was to determine improved diagnostics through digital mammography with assistance of computer algorithms and new investigation techniques. Material and methods: In general, the presen...
详细信息
Objective: The aim of this survey was to determine improved diagnostics through digital mammography with assistance of computer algorithms and new investigation techniques. Material and methods: In general, the presented procedures are practicable with all digital mammography procedures. In our clinic the largest clinical experience exists with the only FDA certified full field mammography device Senographe 2000D (GE Medical Systems). Results: First results from initial studies are shown, which are to evaluate the new procedures. The so-called post processing with visualization of microcalcifications, computer-assisted diagnosis, tomosynthesis, energy subtraction, contrast media in mammography and teleradiology are considered in particular. Conclusion: Digital mammography represents a promising procedure, opening new possibilities for improved diagnostic in mammography.
Geometry has been extensively studied for centuries, almost exclusively from a differential point of view. However, with the advent of the digital age, the interest directed to smooth surfaces has now partially shifte...
详细信息
Geometry has been extensively studied for centuries, almost exclusively from a differential point of view. However, with the advent of the digital age, the interest directed to smooth surfaces has now partially shifted due to the growing importance of discrete geometry. From 3D surfaces in graphics to higher dimensional manifolds in mechanics, computational sciences must deal with sampled geometric data on a daily basis-hence our interest in Applied Geometry.
A new and efficient multiscale model for the segmentation of synthetic aperture radar imagery namely the mixture multiscale autoregressive (MMAR) model, is presented. The estimation of parameters is easily performed v...
详细信息
A new and efficient multiscale model for the segmentation of synthetic aperture radar imagery namely the mixture multiscale autoregressive (MMAR) model, is presented. The estimation of parameters is easily performed via expectation maximisation algorithm. Experimental results of the MMAR model are proposed and compared with those of previous methods.
Atomistic simulations of protein folding have the potential to be a great complement to experimental studies, but have been severely limited by the time scales accessible with current computer hardware and algorithms....
详细信息
Atomistic simulations of protein folding have the potential to be a great complement to experimental studies, but have been severely limited by the time scales accessible with current computer hardware and algorithms. By employing a worldwide distributed computing network of tens of thousands of PCs and algorithms designed to efficiently utilize this new many-processor, highly heterogeneous, loosely coupled distributed computing paradigm, we have been able to simulate hundreds of microseconds of atomistic molecular dynamics. This has allowed us to directly simulate the folding mechanism and to accurately predict the folding rate of several fast-folding proteins and polymers, including a nonbiological helix, polypeptide alpha-helices, a beta-hairpin, and a three-helix bundle protein from the villin headpiece. Our results demonstrate that one can reach the time scales needed to simulate fast folding using distributed computing, and that potential sets used to describe interatomic interactions are sufficiently accurate to reach the folded state with experimentally validated rates, at least for small proteins. (C) 2002 Wiley Periodicals, Inc.
Lack of or improper commissioning, the inability of the building operators to grasp the complexity controls, and lack of proper maintenance lead to inefficient operations and reduced lifetimes of equipment. If regular...
详细信息
Lack of or improper commissioning, the inability of the building operators to grasp the complexity controls, and lack of proper maintenance lead to inefficient operations and reduced lifetimes of equipment. If regularly scheduled manual maintenance or recommissioning practices are adopted, they can be expensive and time consuming. Automated proactive commissioning and diagnostic technologies applied to parts of the commissioning process address two of the main barriers to commissioning cost and schedules. Automated proactive commissioning and diagnostic tools can reduce both the cost and time associated with commissioning, as well as enhance the persistence of commissioning fixes. In the long run, automation even offers the potential for automatically correcting problems by reconfiguring controls or changing control algorithms dynamically. This paper discusses procedures and processes that can be used to automate and continuously commission the economizer operation and outdoor-air ventilation systems of an air-handling unit.
暂无评论