A novel semi-fragile forensic watermarking scheme for remote sensing images

Peer-reviewedA semi-fragile watermarking scheme for multiple band images is presented. We propose to embed a mark into remote sensing images applying a tree structured vector quantization approach to the pixel signatures, instead of processing each band separately. The signature of themmultispectral or hyperspectral image is used to embed the mark in it order to detect any significant modification of the original image. The image is segmented into threedimensional blocks and a tree structured vector quantizer is built for each block. These trees are manipulated using an iterative algorithm until the resulting block satisfies a required criterion which establishes the embedded mark. The method is shown to be able to preserve the mark under lossy compression (above a given threshold) but, at the same time, it detects possibly forged blocks and their position in the whole image.Se presenta un esquema de marcas de agua semi-frágiles para múltiples imágenes de banda. Proponemos incorporar una marca en imágenes de detección remota, aplicando un enfoque de cuantización del vector de árbol estructurado con las definiciones de píxel, en lugar de procesar cada banda por separado. La firma de la imagen hiperespectral se utiliza para insertar la marca en el mismo orden para detectar cualquier modificación significativa de la imagen original. La imagen es segmentada en bloques tridimensionales y un cuantificador de vector de estructura de árbol se construye para cada bloque. Estos árboles son manipulados utilizando un algoritmo iteractivo hasta que el bloque resultante satisface un criterio necesario que establece la marca incrustada. El método se muestra para poder preservar la marca bajo compresión con pérdida (por encima de un umbral establecido) pero, al mismo tiempo, detecta posiblemente bloques forjados y su posición en la imagen entera.Es presenta un esquema de marques d'aigua semi-fràgils per a múltiples imatges de banda. Proposem incorporar una marca en imatges de detecció remota, aplicant un enfocament de quantització del vector d'arbre estructurat amb les definicions de píxel, en lloc de processar cada banda per separat. La signatura de la imatge hiperespectral s'utilitza per inserir la marca en el mateix ordre per detectar qualsevol modificació significativa de la imatge original. La imatge és segmentada en blocs tridimensionals i un quantificador de vector d'estructura d'arbre es construeix per a cada bloc. Aquests arbres són manipulats utilitzant un algoritme iteractiu fins que el bloc resultant satisfà un criteri necessari que estableix la marca incrustada. El mètode es mostra per poder preservar la marca sota compressió amb pèrdua (per sobre d'un llindar establert) però, al mateix temps, detecta possiblement blocs forjats i la seva posició en la imatge sencera

The genetics of endophenotypes of neurofunction to understand schizophrenia (GENUS) consortium: a collaborative cognitive and neuroimaging genetics project

Background Schizophrenia has a large genetic component, and the pathways from genes to illness manifestation are beginning to be identified. The Genetics of Endophenotypes of Neurofunction to Understand Schizophrenia (GENUS) Consortium aims to clarify the role of genetic variation in brain abnormalities underlying schizophrenia. This article describes the GENUS Consortium sample collection. Methods We identified existing samples collected for schizophrenia studies consisting of patients, controls, and/or individuals at familial high-risk (FHR) for schizophrenia. Samples had single nucleotide polymorphism (SNP) array data or genomic DNA, clinical and demographic data, and neuropsychological and/or brain magnetic resonance imaging (MRI) data. Data were subjected to quality control procedures at a central site. Results Sixteen research groups contributed data from 5199 psychosis patients, 4877 controls, and 725 FHR individuals. All participants have relevant demographic data and all patients have relevant clinical data. The sex ratio is 56.5% male and 43.5% female. Significant differences exist between diagnostic groups for premorbid and current IQ (both p 10,000 participants. The breadth of data across clinical, genetic, neuropsychological, and MRI modalities provides an important opportunity for elucidating the genetic basis of neural processes underlying schizophrenia

Electric field-induced carbon nanotube junction formation

10.1063/1.1383279Applied Physics Letters792260-262APPL

Synthesis of well-aligned multiwalled carbon nanotubes on Ni catalyst using radio frequency plasma-enhanced chemical vapor deposition

10.1016/S0040-6090(01)00828-8Thin Solid Films3881-273-77THSF

Gas sensing properties of tin oxide nanostructures synthesized via a solid-state reaction method

10.1088/0957-4484/19/25/255706Nanotechnology1925-NNOT

Large damage threshold and small electron escape depth in X-ray absorption spectroscopy of a conjugated polymer thin film

10.1021/la060974qLangmuir22208587-8594LANG

Dual band-notched tapered slot antenna using λ/4 band-stop filters

This study proposed a novel quarter-wavelength band-rejected element for band-notched antennas. It consists of a metal via and a rectangular strip connected to the radiating patch. In order to validate the design, a dual band-notched elliptically tapered slot antenna for ultra-wideband (UWB) applications is designed using the loaded strips. This antenna is capable of filtering the coexistent WLAN802.11a frequency bands 5.15-5.35 and 5.725-5.825 GHz. Compared with other band-notched UWB antennas, this antenna features the merit of easy tuning of each rejected frequency band because of the low mutual coupling between loaded strips at rejected frequencies. Both simulated and measured results confirm that the proposed antenna is able to achieve a wide bandwidth from 3 to over 11 GHz with two unwanted frequency bands notched. Stable radiation patterns are observed across the operational frequency range, with cross-polarisation levels below 220 dB

Robust reproducible large-area molecular rectifier junctions

10.1063/1.2940592Applied Physics Letters9225-APPL