Délimitation d'unités de paysage sur des photographies aériennes. Eléments de reflexion pour la définition d'une méthode de tracé (interprétation, limite de sol, croisement de carrés, SIG mode vecteur)

National audienc

Transputer based distributed cartographic image processing

Image processing requires large amounts of memory (main memory and mass storage) and important processing power. Digital signal processors (DSP) can increase processing speeds, but they don't provide any facilities for multiprocessing and for the management of mass storage devices. The present project requires the processing of large aerial photographs (20000×20000 pixels) for the automatic computation of terrain elevation. Currently, a CCD camera scans image parts of 512 by 480 pixels and transmits them to the image processing array. A processing array based on transputers was chosen for the parallelization of image processing operations. Such an architecture can easily be expanded if more processing power and storage capacity are required. The authors describe the message passing system ensuring communications between any processors of the network and several image processing algorithms running in a network which currently includes twenty transputer

THE G-FACTOR AND LIFETIME OF THE 3- (298 KEV) STATE IN N-16

The g-factor of the 3- (298 keV) state in 16N has been measured by observing the hyperfine modulation of the γ-ray anisotropy in one-electron ions recoiling in vacuum following the 2H(15N, p)16N reaction. From the observed spatial frequency the g-factor was deduced to be |g| = 0.532±0.020. Simultaneous lifetime determinations for this state and the 1- (397 keV) state in 16N gave values of τm = 131.7±1.9 ps and τm = 5.63±0.05 ps, respectively. These and other electromagnetic observables associated with the lowest four levels in 16N are compared to shell-model calculations. © 1984

Graphic stereo raster injected verification subsystem for photogrammetric acquisition

Summary form only given. The Laboratories of Photogrammetry and Microinformatics of the Swiss Federal Institute of Technology of Lausanne have developed, in collaboration with the industry, a graphical verification system. The main innovations of this system, in comparison with the above cited existant systems, are full editing facilities, the possibility to include the height information, and a rather low price. Furthermore, the system can be used as a peripheral for analytical or analog stereo plotters. These innovations are due to the development of a powerful display architecture with build-in dedicated panning functionality. This paper describes the characteristics of the hardware and the possibilities provided by the software. The system is based on a Motorola microprocessor and NEC graphical controller chips. It allows the operator to move in real-time (panning) in a virtual working space of 32000×32000 pixels, with a vertical and horizontal resolution of 1 pixe

Prognostic significance of tumor angiogenesis in epithelial ovarian cancer

The tumor microenvironment determines development and progression of many cancers. Epithelial-mesenchymal transition (EMT) is fundamental to tumor progression and metastasis not only by increasing invasiveness but also by increasing resistance to cell death, senescence, and various cancer therapies; determining inflammation and immune surveillance; and conferring stem cell properties. It does this by enabling polarized epithelial cells to transform into cells with a mesenchymal, and therefore motile, phenotype. Tumor-associated macrophages (TAMs) are key cells of the tumor microenvironment that orchestrate the connection between inflammation and cancer. Activation of EMT often requires crosstalk between cancer cells and components of the local tumor microenvironment, including TAMs. In this review, clinical and experimental evidence is presented for control of TAMs in promoting cancer cell invasion and migration and their interaction with the EMT process in the metastatic cascade. The translational significance of these findings is that the signaling pathways that interconnect TAMs and EMT-modified cancer cells may represent promising therapeutic targets for the treatment of tumor metastasis

Prevention of heterotopic ossification in high-risk patients with total hip arthroplasty: the experience of a combined therapeutic protocol

The combination of radiotherapy and indomethacin for the prevention of heterotopic ossification (HO) in high-risk patients undergoing total hip arthroplasty (THA) has not been reported. The aim of the present study was to present the experience of our department with this combined therapeutic protocol. Fifty-four patients who underwent THA received a single dose of 7 Gy of postoperative radiotherapy and 75 mg of indomethacin for 15 days. Patients were analyzed for clinical and radiographical evidence of HO development at 1 year postoperatively. The overall radiographical incidence of HO was 20.4% (95% CI 10.6–33.5%), while only 1 patient with clinically significant HO was seen. Patients with secondary arthritis due to congenital hip disease had a statistically significantly higher incidence of HO compared with those with osteoarthrosis. The clinical assessment with the Merle d’Aubigné score showed that patients with radiographic documentation of HO had a lower mean score compared with those with no evidence of HO. No treatment-related side effects were seen. Combined radiotherapy and indomethacin was effective in preventing heterotopic ossification after total hip arthroplasty. The evaluation of this efficacy compared with radiotherapy or NSAIDs alone should be the future target of larger randomized designs