Super-efficiency DEA in the presence of infeasibility: One model approach

A two-stage procedure is developed by Lee et al. (2011) [European Journal of Operational Research doi:10.1016/j.ejor.2011.01.022] to address the infeasibility issue in super-efficiency data envelopment analysis (DEA) models. We point out that their two-stage procedure can be solved in a single DEA-based model.     

Synergistic effect of the simultaneous chemometric analysis of H NMR spectroscopic and stable isotope (SNIF-NMR,O, C) data: Application to wine analysis

It is known that ¹H NMR spectroscopy represents a good tool for predicting the grape variety, the geographical origin, and the year of vintage of wine. In the present study we have shown that classification models can be improved when ¹H NMR profiles are fused with stable isotope (SNIF-NMR, ¹⁸O, ¹³C) data. Variable selection based on clustering of latent variables was performed on ¹H NMR data. Afterwards, the combined data of 718 wine samples from Germany were analyzed using linear discriminant analysis (LDA), partial least squares-discriminant analysis (PLS-DA), factorial discriminant analysis (FDA) and independent components analysis (ICA). Moreover, several specialized multiblock methods (common components and specific weights analysis (ComDim), consensus PCA and consensus PLS-DA) were applied to the data.     

Fast and Selective Determination of Pesticides in Water by Automated On-Line Solid Phase Extraction Liquid Chromatography Tandem Mass Spectrometry

An automated on line-solid phase extraction (SPE) liquid chromatography-tandem mass spectrometry (LC-MS/MS) method was developed for the determination of 17 polar pesticides in water. Minimizing sample pretreatment and using a fast chromatographic separation, the method allowed a sample to be processed in 15 minutes. The MS analysis was performed by Data Dependent Acquisition, using the triggered Multiple Reaction Mode function that provided analyte confirmation, thus enhancing selectivity without compromising sensitivity. In fact, the optimized method enabled the determination of the considered pesticides at the ultratrace level, with detection limits in the range 0.07–1.65 ng/L (propazine and atrazine-desisopropyl, respectively); the only exception was linuron that showed a slightly higher detection limit (12.2 ng/L). The optimized method was then applied to real water samples; five pesticides were determined in river water, in the range 1.17–14.2 ng/L, while four were measured in drinking water, in the range 0.91–2.25 ng/L.     

空间调制型干涉光谱成像仪数据压缩方法研究

干涉型光谱成像技术是一种新型的光谱成像技术,近些年来发展迅速。在星载使用时,由于卫星数据传输容量的限制,需要对干涉成像光谱仪获得的原始干涉数据进行压缩,然后经过数据传输,到地面进行解压缩,再进行光谱复原处理,才能交给用户使用,干涉数据的压缩是一项新的技术,国内外很少有专门的文献进行介绍,基于该单位对此技术多年的研究,针对空间调制型干涉光谱成像仪数据的特点,结合环境与灾害监测预报小卫星星座A星超光谱成像仪的数据,提出了一种针对空间调制型干涉成像光谱仪的数据压缩方法,获得了很好的结果。     

空间调制型干涉光谱成像仪数据处理方法

干涉型光谱成像技术是一种新型的光谱成像技术,近些年来发展迅速。干涉成像光谱仪获得的是间接数据干涉图,不能被用户直接使用,需要进行干涉数据反演处理,包括数据预处理(干涉图修正)、切趾、相位修正、傅里叶变换、光谱辐射定标等一系列复杂的处理,目前国内外尚未有文献对干涉数据处理技术进行全面的分析,文章基于作者单位对此技术多年的研究,针对空间调制型干涉光谱成像仪的数据处理方法,结合环境与灾害卫星超光谱成像仪的数据,提出了一套有效的数据反演方法和流程,获得了很好的数据反演结果。     

Data processing in BOTDR distributed strain measurement based on pattern recognition

As a distributed fiber optic sensor able to monitor strain distribution within dozens of miles, BOTDR is widely applied in structural health monitoring (SHM). However, the difficulty of data processing has been in the way of health monitoring of civil structures and hence an obstacle against BOTDR’s development. In order to realize the rapid processing of distributed strain data, the strain measurement line was divided into a series of waveform units to confirm whether waveform units are normal or not by pattern recognition while taking both mean and standard deviation of characteristic vector into consideration, as well as combine neighboring abnormal units as abnormal area and give evaluation and warning to this area by the correspondence between waveforms and fiber deformation. The application of data processing in distributed monitoring of a certain tunnel showed that the abnormal area can be located fast and accurately and the deformation of optical fiber and structure can be evaluated with this technology.     

Resources scheduling for data relay satellite with microwave and optical hybrid links based on improved niche genetic algorithm

The formation of the Space-based Information System with the technology of high performance optical inter-satellite communication and the realization of global seamless coverage and mobile terminal accessing are the necessary trend of the development of optical and microwave hybrid communication. Considering the resources, missions and restraints of data relay satellite optical and microwave hybrid links system, a model of hybrid links resources scheduling is established and a scheduling algorithm based on an improved niche genetic algorithm is put forwarded. According to the multi-user-satellite, multi-time-window, multi-class-antenna and a number of missions with priority weight, the scheduling schemes are generated randomly to begin with and evaluated with the fitness functions. To obtain an optimal scheduling result, an improved niche genetic algorithm is adopted to optimize the scheduling schemes. The simulation result reveals that a satisfactory result is obtained and the improved niche genetic algorithm has advantages in both efficiency and performance in a scenario including a relay satellite with 2 optical antennas and 1 microwave antenna for user satellites connection, 8 user satellites with 64 missions. The simulation indicates that the model and the optimization algorithm are suitable for multi-user, multi-mission and multi-class-antenna hybrid communication recourses scheduling problem.     

Demosaicking authentication codes using adaptive step via color difference estimation

In this paper, data hiding is used for raw images instead of the full-resolution color version. Among various color filter array patterns, we choose the most popular Bayer pattern and cover authentication codes in the pseudo host from original sampling in terms of high correlation within red, blue and green channels. pseudo host is based on a transient image that is created by interpolating in this pattern by selecting the key. This procedure confirms the security, in the meantime, and less brings the artifact of embedding codes. This process exploits spatial correlations both red and blue channel to adaptively tune quantization scale parameter and suppresses visual distortion. Core structure presents a watermarking to jointly resist to demosaicking and JPEG compression approach. It can carry visual distortion as small as possible. The simulations test the robustness and transparency after some demosaicking methods and JPEG compression. These results imply that hiding data accompany with less demosaicking traces and the better robustness via various demosaicking methods.