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Wei T.,Sun Yat Sen University | Lu Y.,Sun Yat Sen University | Chang H.,Sun Yat Sen University | Zhou Q.,Sun Yat Sen University | Bao X.,Shenzhen Academy of Inspection and Quarantine
Expert Systems with Applications | Year: 2015

Traditional clustering algorithms do not consider the semantic relationships among words so that cannot accurately represent the meaning of documents. To overcome this problem, introducing semantic information from ontology such as WordNet has been widely used to improve the quality of text clustering. However, there still exist several challenges, such as synonym and polysemy, high dimensionality, extracting core semantics from texts, and assigning appropriate description for the generated clusters. In this paper, we report our attempt towards integrating WordNet with lexical chains to alleviate these problems. The proposed approach exploits ontology hierarchical structure and relations to provide a more accurate assessment of the similarity between terms for word sense disambiguation. Furthermore, we introduce lexical chains to extract a set of semantically related words from texts, which can represent the semantic content of the texts. Although lexical chains have been extensively used in text summarization, their potential impact on text clustering problem has not been fully investigated. Our integrated way can identify the theme of documents based on the disambiguated core features extracted, and in parallel downsize the dimensions of feature space. The experimental results using the proposed framework on reuters-21578 show that clustering performance improves significantly compared to several classical methods. © 2014 The Authors.

Zhang J.X.,Guangdong Academy of Agricultural Sciences | Lin B.R.,Guangdong Academy of Agricultural Sciences | Shen H.F.,Guangdong Academy of Agricultural Sciences | Pu X.M.,Guangdong Academy of Agricultural Sciences | And 2 more authors.
Plant Disease | Year: 2012

Potato (Solanum tuberosum L.) is a major crop in China, with 80.0 million tons being produced in 2010 on 3.3 million ha. Pectobacterium carotovorum subsp. carotovorum Jones 1901; Hauben et al. 1999 causes soft rot worldwide on a wide range of hosts including potato, carrot, and cabbage. During spring 2010, a soft rot with a foul smell was noted in stored potato tubers of different cultivars in the Guangdong Province. Symptoms on tubers appeared as tan, water-soaked areas with watery ooze. The rotted tissues were white to cream colored. Stems of infected plants with typical inky black symptoms could also be found in the fields prior to harvest. Three different potato fields were surveyed, and 13% of the plants had the symptoms. Twenty-seven samples (three symptomatic tubers per sample) were collected. Bacteria were successfully isolated from all diseased tissues on nutrient agar media supplemented with 5% sucrose and incubated at 26 ± 1°C for 36 h. After purification on tripticase soy agar media, four typical strains (7-3-1, 7-3-2, 8-3-1, and 8-3-2) were identified using the following deterministic tests: gram-negative rods, oxidase negative, facultatively anaerobic, able to degrade pectate, sensitive to erythromycin, negative for phosphatase, unable to produce acid from?-methyl-glucoside, and produced acid from trehalose. Biolog analysis (Ver 4.20.05, Hayward, CA) identified the strains as P. carotovorum subsp. carotovorum (SIM 0.808, 0.774, 0.782, and 0.786, respectively). The identity of strains 7-3-1 (GenBank Accession No. JX258132), 7-3-2 (JX258133), and 8-3-1 (JX196705) was confirmed by 16S rRNA gene sequencing (4), since they had 99% sequence identity with other P. carotovorum subsp. carotovorum strains (GenBank Accession Nos. JF926744 and JF926758) using BLASTn. Further genetic analysis of strain 8-3-1 was performed targeting informative housekeeping genes, i.e., acnA (GenBank Accession No. JX196704), gabA (JX196706), icdA (JX196707), mdh (JX196708), mtlD (JX196709), pgi (JX196710), and proA (JX196711) (2). These sequences from strain 8-3-1 were 99 to 100%, homologous to sequences of multiple strains of P. carotovorum subsp. carotovorum. Therefore, strain 8-3-1 grouped with P. carotovorum subsp. carotovorum on the phylogenetic trees (neighbor-joining method, 1,000 bootstrap values) of seven concatenated housekeeping genes when compared with 60 other strains, including Pectobacterium spp. and Dickeya spp. (3). Pathogenicity of four strains (7-3-1, 7-3-2, 8-3-1, and 8-3-2) was evaluated by depositing a bacterial suspension (106 CFU/ml) on the potato slices of cultivar 'Favorita' and incubating at 30 ± 1°C. Slices inoculated with just water served as non-inoculated checks. The strains caused soft rot within 72 h and the checks had no rot. Bacteria were reisolated from the slices and were shown to be identical to the original strains based on morphological, cultural, and biochemical tests. Although this pathogen has already been reported in northern China (1), to our knowledge, this is the first report of P. carotovorum subsp. carotovorum causing bacterial soft rot of potato in Guangdong Province of China.

Bao X.Y.,Shenzhen Academy of Inspection and Quarantine | Zhong J.Z.,Shenzhen Academy of Inspection and Quarantine | Feng Q.,Shenzhen Entry Exit Inspection and Quarantine Bureau | Guo Y.,Shenzhen Academy of Inspection and Quarantine
Applied Mechanics and Materials | Year: 2014

This paper proposed an efficient electronic seal system based on Near Field Communication (NFC), which utilized by NFC mobile phone, RSA encryption, authentication and anti-counterfeiting validation. The system has the advantages of high security and low cost. In addition, the whole process of logistics could be supervised without special equipment. These lay a solid foundation for "release through" supervision of agricultural products supplied to Hong Kong. © (2014) Trans Tech Publications, Switzerland.

Bao X.,Shenzhen Academy of Inspection and Quarantine | Wu S.,Shenzhen Academy of Inspection and Quarantine
Lecture Notes in Electrical Engineering | Year: 2012

An embedded mobile Internet supervision system was developed for the whole process of food traceability, in order to ensure food safety supplied to Hong Kong. The modulated design of each functional unit and Intel X86 architecture gives a compact 205mm×115mm×22m unit with data process and control by both Atom Z530 and SCH US15W, memory, power management, LVDS input/output, RFID data collection, and mobile Internet. Therefore, the system could work independently as a hand-held supervision device or directly tied to the cross-border vehicles, suitable for the border inspection, record access and browsing, and peccancy vehicles positioning and tracking. © 2012 Springer-Verlag GmbH.

Bao X.,Tsinghua University | Bao X.,Shenzhen Academy of Inspection and Quarantine | Zheng W.,Tsinghua University | Lu Q.,Shenzhen Academy of Inspection and Quarantine
Qinghua Daxue Xuebao/Journal of Tsinghua University | Year: 2012

An embedded mobile supervision system was developed for the entire exported food traceability process based on the Intel Centrino Atom processor technology to ensure exported food safety and meet the needs of general-purpose hardware and compatible software. The different hardware unit designs were based on the X86 Intel architecture (IA) and modulated function. Software was used for the pressure data processing of the touch screen. The system was tested for the fruit and vegetable traceability system for food supplied to Hong Kong from Shenzhen ports. The results demonstrate the effectiveness and practicality of the developed system.

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