Rui Chen’s research while affiliated with East China University of Technology and other places

Molecular images of documents were obtained by sequentially scanning the surface of the document using desorption atmospheric pressure chemical ionization mass spectrometry (DAPCI-MS), which was operated in either a gasless, solvent-free or methanol vapor-assisted mode. The decay process of the ink used for handwriting was monitored by following the signal intensities recorded by DAPCI-MS. Handwritings made using four types of inks on four kinds of paper surfaces were tested. By studying the dynamic decay of the inks, DAPCI-MS imaging differentiated a 10-min old from two 4 h old samples. Non-destructive forensic analysis of forged signatures either handwritten or computer-assisted was achieved according to the difference of the contour in DAPCI images, which was attributed to the strength personalized by different writers. Distinction of the order of writing/stamping on documents and detection of illegal printings were accomplished with a spatial resolution of about 140 µm. A Matlab® written program was developed to facilitate the visualization of the similarity between signature images obtained by DAPCI-MS. The experimental results show that DAPCI-MS imaging provides rich information at the molecular level and thus can be used for the reliable document analysis in forensic applications. © 2013 The Authors. Journal of Mass Spectrometry published by John Wiley & Sons, Ltd.

Based on the analysis of current zip code, this article put forward a new encoding algorithm of the address tree - the largest matching algorithm. This algorithm combines the characteristics of the address tree, considering the uniqueness of the address tree, raises a best matching theory, and taking into the matching speed of the address tree, brings in the associate floors of the node of the address tree to improve the efficiency of the match. Because of the change of the address tree, the address tree’s thesaurus in order to timely update its information, increase unknown node by intelligent means automatically.

This paper describes the method of radioactivity measurement to eliminate the outliers in experiment. The value of radon concentration can cause deviation in the process of transmission because the FH-463 is interfered in the process of measurement by external factors such as electromagnetic waves etc. It makes measurements vary greater than the Expectations. And it can only process 10% or less Outlier when using Grubbs’ criterion directly. In order to meet the Radon Concentration for inspection, the paper makes some necessary improvement on the criterion to adapt itself and estimates the sample data with linear regression. The experimental results show that the method is very convenient to reject the data with deviation more effective. The method in this paper can also be used in other fields.

The unbalanced signal is common in communication signal analysis. The paper apply FFT and wavelet to analyze the unbalanced signal, the simulation show that wavelet analysis is more suitable for emergency signal analysis.

In order to improve the working efficiency of every department and employee in Fuzhou Mobile Company of China, a performance appraisal approach based on unified modeling language is proposed. The performance appraisal indictors is defined by link relative method, the dimension of indictor will be eliminated by mathematical transformation. The relative management system is developed, the required data is collected and computed by the system . The evaluation result provided decision support for the supervisor of company .

This paper discusses the application of the process monitoring and control for Radon Chamber with WinCC, configuration software with a human-machine interface (HMI) and Supervisory Control and Data Acquisition (SCADA), which is used to monitor the dynamical industrial process. Both software and hardware-based implementations of this system are described in detail, including the dynamic replenishment model. The paper also presents the every component of radon chamber structure exhaustively.