This paper presents a new method for tumor classification using gene expression data. In the proposed method, we first select genes nonnegative matrix factorization (NMF) or sparse NMF (SNMF), and then extract features from selected by virtue of SNMF. At last, apply support vector machines (SVM) to classify samples extracted features. order better classification, modified SNMF algorithm is also proposed. The experimental results on benchmark three microarray data sets validate that...

Inverse Synthetic Aperture Radar (ISAR) images of space targets and their key components are very important. However, this method suffers from numerous drawbacks, including a low Signal-to-Noise Ratio (SNR), blurred edges, significant variations in scattering intensity, limited data availability, all which constrain its recognition capabilities. The terahertz (THz) regime has reflected excellent capacity for detection terms showing the details target structures. ISAR images, as observation...

Airborne terahertz video synthetic aperture radar (THz-ViSAR) exhibits excellent superiorities in the dynamic situation awareness and moving targets detection. However, limited by recording precision of inertial navigation system (INS) or global positioning (GPS), data-driven motion compensation (MOCO) methods are challenging to eliminate errors for THz band. Particularly, platform vibrations that previously negligible microwave band, become non-negligible, drastically degrading focusing...

Fast raw-signal simulation is of considerable value for missile-borne synthetic aperture radar (SAR) algorithm development. On the basis two-dimensional (2-D) Fourier method stripmap SAR, we present a fast echo suitable SAR diving with constant acceleration. The analytical expression 2-D signal spectrum derived and then converted to one. Simulation results point target real scene demonstrate its validity effectiveness.

In recent years, various fast imaging algorithms have been developed for near-field millimeter-wave (MMW) sparse multiple-input–multiple-output synthetic aperture radar (MIMO-SAR) system, and most of them are implemented through Fourier transform (FFT). However, these strict requirements on the uniformity sparsity MIMO arrays, hardly guarantee high-quality image reconstruction under a large dynamic range. This article proposes an efficient MMW algorithm based alternating direction method...

Short-range millimeter-wave (MMW) multiple-input multiple-output synthetic aperture radar (MIMO-SAR) imaging technology has great development opportunities in the areas of security monitoring, medical diagnosis, and nondestructive evaluation. However, existing MIMO-SAR fast algorithms typically employ Fourier transform (FFT) to invert target image, which a serious influence on quality under highly displayed dynamic range. To address this deficiency, article presents an adaptive alternating...

Different from conventional millimeter-wave (MMW) holographic 3-D imaging, a new technique that can produce accurate point cloud and the surface model of target based on cylindrical MMW holography system is proposed. The precision obtained much higher than resolution image since phase information in echoes utilized more sufficiently. Compared with some optic-based reconstruction methods, proposed method independent ambient light conditions capable to penetrate clothes wrappers. An overall...

Abstract Background Abnormal glucose metabolism is one of the determinants maintaining malignant characteristics cancer. Targeting cancer regarded as a new strategy for treatment. Our previous studies have found that TOP1MT crucial gene inhibits glycolysis and cell metastasis gastric (GC) cells, but mechanism its regulation remains unclear. Methods Transcriptome sequencing data, clinic-pathologic features GC from variety public databases, WGCNA were used to identify novel targets TOP1MT....

In this letter, an efficient millimeter-wave (MMW) frequency-domain imaging algorithm is presented for 3-D object reconstruction of the near-field multiple-input–multiple-output synthetic aperture radar (MIMO-SAR) with nonuniform transmitting array. For each single-input–multiple-output (SIMO) case MIMO-SAR setup, precise spectral echo expression derived by spherical-wave decomposition and fast Fourier transform (FFT) operations. To obtain linear phase in range direction, multiorder...

Video synthetic aperture radar (ViSAR) operating at low-frequencies generally suffers from low frame-rate and high latency due to its wide long dwell time. To conquer the problems mentioned above, this article proposes a ViSAR imaging processing framework based on terahertz (THz) regime. The proposed method only needs data repetition ratio of 0% rather than 80% for microwave reach 0.2m resolution 5Hz frame rate with thanks designed pulse frequency (PRF) system short wavelength THz wave....

Different from conventional radar systems, for the single-photon radar, a detector acts as receiver to detect echo signal with only few photons, which can be used achieve ultrahigh sensitivity long-distance target detection. In this letter, heterodyne at terahertz frequencies is studied, first time. First, working principle of developed presented, and derived. Subsequently, estimation method distance Doppler frequency proposed, performance analyzed by probability density function (PDF)...

Conventional polar format algorithm (PFA) and its variations normally assume an ideal imaging geometry of a linear flight path, which cannot counteract the non-uniformity samples existing in circumstance highly non-linear aperture. This scenario may occur because various factors such as rugged topography, atmospheric turbulence intended manoeuvres. To address this challenge, study develops novel PFA with aperture accommodation for spotlight synthetic radar (SAR) imaging. The proposed...

To deal with the perfect electric conductor rough targets' scattering problem, which is basic premise of radar applications at terahertz frequencies, a hierarchical semideterministic modeling and full-wave-algorithm-based computation method was proposed. The fields phase information synthetic aperture images electrically large cubes different surface characteristics were obtained. influence roughness can be easily observed. According to imaging results, we predict that other than calculation...