SPIE Defense + Commercial Sensing最新文献_第7页

Development and performance of the Fast Neutron Imaging Telescope for SNM detection 用于SNM探测的快中子成像望远镜的研制与性能

SPIE Defense + Commercial Sensing Pub Date : 2008-04-25 DOI: 10.1117/12.777699

J. Ryan, U. Bravar, E. Flückiger, J. Macri, M. McConnell, B. Pirard, R. Woolf

引用次数: 5

Extended depth of field imaging at 94 GHz 扩展景深成像在94千兆赫

SPIE Defense + Commercial Sensing Pub Date : 2008-04-25 DOI: 10.1117/12.775180

J. Mait, D. Wikner, M. Mirotznik, J. van der Gracht, G. Behrmann, B. Good, S. Mathews

引用次数: 0

A comparative study of 3.6μm and 1.55μm atmospheric transmission 3.6μm和1.55μm大气透射率的对比研究

SPIE Defense + Commercial Sensing Pub Date : 2008-04-24 DOI: 10.1117/12.783839

R. Mahon, H. R. Burris, M. Ferraro, C. Moore, W. Rabinovich, M. Suite, W. Bewley, C. Canedy, D. Larrabee, J. R. Meyer, I. Vurgaftman

{"title":"A comparative study of 3.6μm and 1.55μm atmospheric transmission","authors":"R. Mahon, H. R. Burris, M. Ferraro, C. Moore, W. Rabinovich, M. Suite, W. Bewley, C. Canedy, D. Larrabee, J. R. Meyer, I. Vurgaftman","doi":"10.1117/12.783839","DOIUrl":"https://doi.org/10.1117/12.783839","url":null,"abstract":"The use of 1.55μm lasers for free space optical links has become well established. While one expects there to be advantages to operating at 3.6μm, namely higher transmission through water vapor and reduced scintillation, the availability of both lasers and detectors at the mid IR wavelength is not as mature as those available at the telecomm choice of 1.55μm. However, there are potential schemes for using frequency conversion to probe the atmosphere in the mid-ir but to detect back in the near-ir. A sequence of experiments has been conducted, over a 16km one-way link across the Chesapeake Bay, to directly compare the intensity variances and the power spectrum imposed by the atmosphere at the two wavelengths. An interband cascade laser was used which operated at a wavelength of 3.6μm and had an output power of 100mW. The 1.55μm system used standard telecomm parts. Data were recorded simultaneously from both systems at 4kHz and were digitized using a 16-bit card. A telescope measured the angle-of-arrival variance of the 1.55mm beam in order to give a measure of the atmospheric structure constant Cn2. In addition a visibility monitor and weather station were usually operational at each end of the link.","PeriodicalId":133868,"journal":{"name":"SPIE Defense + Commercial Sensing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114392205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

The spatial-temporal evolution of the far field irradiance distribution from a Gaussian beam due to atmospheric turbulence in the boundary layer 边界层大气湍流作用下高斯光束远场辐照度分布的时空演化

SPIE Defense + Commercial Sensing Pub Date : 2008-04-24 DOI: 10.1117/12.777967

R. Oermann

引用次数: 1

Mirage effects in the marine layer across Chesapeake Bay 切萨皮克湾海洋层的海市蜃楼效应

SPIE Defense + Commercial Sensing Pub Date : 2008-04-24 DOI: 10.1117/12.800782

C. Font, C. A. Armstrong, G. C. Gilbreath, L. Parchment, M. Suite, H. R. Burris

引用次数: 0

Quantum lattice gas algorithm for quantum turbulence and vortex reconnection in the Gross-Pitaevskii equation Gross-Pitaevskii方程中量子湍流和涡旋重连的量子点阵气体算法

SPIE Defense + Commercial Sensing Pub Date : 2008-04-23 DOI: 10.1117/12.777722

G. Vahala, J. Yepez, L. Vahala

引用次数: 3

Combining advanced imaging processing and low cost remote imaging capabilities 结合先进的成像处理和低成本的远程成像能力

SPIE Defense + Commercial Sensing Pub Date : 2008-04-23 DOI: 10.1117/12.778480

Matthew J. Rohrer, B. Mcquiddy

引用次数: 1

Multi-objects recognition for distributed intelligent sensor networks 分布式智能传感器网络的多目标识别

SPIE Defense + Commercial Sensing Pub Date : 2008-04-23 DOI: 10.1117/12.783105

Haibo He, Sheng Chen, Yuan Cao, S. Desai, Myron E. Hohil

{"title":"Multi-objects recognition for distributed intelligent sensor networks","authors":"Haibo He, Sheng Chen, Yuan Cao, S. Desai, Myron E. Hohil","doi":"10.1117/12.783105","DOIUrl":"https://doi.org/10.1117/12.783105","url":null,"abstract":"This paper proposes an innovative approach for multi-objects recognition for homeland security and defense based intelligent sensor networks. Unlike the conventional way of information analysis, data mining in such networks is typically characterized with high information ambiguity/uncertainty, data redundancy, high dimensionality and real-time constrains. Furthermore, since a typical military based network normally includes multiple mobile sensor platforms, ground forces, fortified tanks, combat flights, and other resources, it is critical to develop intelligent data mining approaches to fuse different information resources to understand dynamic environments, to support decision making processes, and finally to achieve the goals. This paper aims to address these issues with a focus on multi-objects recognition. Instead of classifying a single object as in the traditional image classification problems, the proposed method can automatically learn multiple objectives simultaneously. Image segmentation techniques are used to identify the interesting regions in the field, which correspond to multiple objects such as soldiers or tanks. Since different objects will come with different feature sizes, we propose a feature scaling method to represent each object in the same number of dimensions. This is achieved by linear/nonlinear scaling and sampling techniques. Finally, support vector machine (SVM) based learning algorithms are developed to learn and build the associations for different objects, and such knowledge will be adaptively accumulated for objects recognition in the testing stage. We test the effectiveness of proposed method in different simulated military environments.","PeriodicalId":133868,"journal":{"name":"SPIE Defense + Commercial Sensing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124150978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Dependent component analysis applied to lesions' characterization in breast MRI 依赖成分分析在乳腺MRI病变表征中的应用

SPIE Defense + Commercial Sensing Pub Date : 2008-04-23 DOI: 10.1117/12.777288

A. Meyer-Bäse, O. Lange, T. Schlossbauer, A. Wismueller

{"title":"Dependent component analysis applied to lesions' characterization in breast MRI","authors":"A. Meyer-Bäse, O. Lange, T. Schlossbauer, A. Wismueller","doi":"10.1117/12.777288","DOIUrl":"https://doi.org/10.1117/12.777288","url":null,"abstract":"An application of dependent component analysis techniques is reported for the detection and characterization of small indeterminate breast lesions in dynamic contrast-enhanced MRI. These techniques enable the extraction of spatial and temporal features of dynamic MRI data stemming from patients with confirmed lesion diagnosis. By revealing regional properties of contrast-agent uptake characterized by subtle differences of signal amplitude and dynamics, this method provides both a set of prototypical time-series and a corresponding set of cluster assignment maps which further provides a segmentation with regard to identification and regional subclassification of pathological breast tissue lesions. We present two different segmentation methods for the evaluation of signal intensity time courses for the differential diagnosis of enhancing lesions inStarting from the conventional methodology, we proceed by introducing the separate concepts of threshold segmentation and dependent component analysis and in the last step by combining those two concepts. The results suggest that the dependent component approach has the potential to increase the diagnostic accuracy of MRI mammography by improving the sensitivity without reduction of specificity.","PeriodicalId":133868,"journal":{"name":"SPIE Defense + Commercial Sensing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132614013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Model link and knot mapping in quantum electrodynamics 量子电动力学中的模型链接和结映射

SPIE Defense + Commercial Sensing Pub Date : 2008-04-23 DOI: 10.1117/12.775740

H. Brandt

引用次数: 0