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Secure multi-party computation protocol for sequencing problem

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Science china(Information sciences) 2011年第8期54卷 1654-1662页

作者： TANG ChunMing 1,2,SHI GuiHua 1 & YAO ZhengAn 3 1 school of Mathematics and Information Science,guangzhou university,guangzhou 510006, china 2state key laboratory of Information Security, Institute of Software Science,Chinese Academy of sciences,Beijing 100080,china 3 school of Mathematics and Computational Science,sun yat-sen university,guangzhou 510275,china 1. school of Mathematics and Information Science Guangzhou University Guangzhou 510006 China2. State Key Laboratory of Information Security Institute of Software Science Chinese Academy of Sciences Beijing 100080 China3. School of Mathematics and Computational Science Sun Yat-Sen University Guangzhou 510275 China

In the field of multi-party computation,an important problem is how to construct an efficient and secure multi-party computation protocol for certain specific *** the present study,we make use of a secret sharing scheme to construct an efficient and secure multi-party computation protocol for sequencing *** protocols are perfectly secure against both a passive adversary that can corrupt at most t (n-1)/2 participants, and an active adversary that can corrupt at most t < n/3 *** simplest sequencing problem is the Millionaires' problem.

关键词： secure multi-party computation sequencing problem secret sharing

Study on the SiN_x/Al rear reflectance performance of crystalline silicon solar cells

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Science china(Technological sciences) 2010年第12期53卷 3209-3213页

作者： LIANG ZongCun, CHEN DaMing, ZHU YanBin & SHEN Hui Institute for Solar Energy Systems, state key laboratory of Optoelectronic Materials and Technologies, sun yat-sen university, guangzhou 510275, china 1. Institute for Solar Energy Systems State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-Sen University Guangzhou 510275 China

The performance of internal rear surface reflectance of crystalline silicon solar cells is becoming more and more important with the decrease of thickness of the silicon wafers. In this paper PC1D was used to simulate the correlations between the rear surface reflectance and the electrical as well as optical properties of the solar cells. The results showed that the short circuit current, open circuit voltage and quantum efficiency were all enhanced with the increase of the rear reflectance. When the rear reflectance increased from 60% to 100%, the short circuit current, open circuit voltage and maximum output power were improved by about 0.128 A, 0.007 V, and 0.066 W, respectively. The internal quantum efficiency was improved by 39.9%, the external quantum increased by 17.4%, and the efficiency of the solar cells was enhanced by 0.4% at 1100 nm wavelength. The screen-printing was selected to prepare SiNx/Al reflector, and experimental results showed that the SiNx/Al reflector has desired characteristic of internal rear reflectance, with the reflectivity of 15% higher than that of conventional aluminum BSF at 1100 nm wavelength.

关键词： crystalline silicon solar cells rear reflectance PC1D simulation rear reflector

Ecdysteroids in the adults and eggs of Opogona sacchari (Bojer),an invasive alien pest

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Science china(life sciences) 2008年第2期51卷 140-144页

作者： WANG FangHai, ZHANG GuRen, WEN RuiZhen & HE GuoFeng state key laboratory for Biological Control and Institute of Entomology, sun yat-sen university, guangzhou 510275, china 1. state key laboratory for Biological Control and Institute of Entomology Sun Yat-sen University Guangzhou 510275 China

In order to understand the composition and quantitative variation of ecdysteriods in the adults and eggs of Opogona sacchari (Bojer), an invasive alien pest, we analyzed the ecdysteroid composition and titers in the adult and egg of this pest. On day 4 after eclosion, the titer of ecdysteriods in the male adult was 0.080 ng/adult, much lower than 5.978 ng/adult in the female adult. During the development of ovaries, the titer of ecdysteriods was low on the first two days, and high in the late period, with the peak (10.48 ng/ovary) appearing on day 3. During the development of eggs, the titer of ecdysteriods was about 0.010 ng/egg from day 1 to day 3, and then decreased to 0.006 ng/egg on day 4. In both adults and eggs, three main components of ecdysteriods were found by identification of HPLC/RIA. They were 20-hydroxyecdysone, 26-hydroxyecdysone, and an unidentified component.

关键词： Opogona sacchari ecdysteroids adults eggs

Low-temperature Synthesis of Large-area Films of Molybdenum Trioxide Microbelts in Air and the Dependence of Their Field Emission Performance on Growth Conditions

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Journal of Materials Science & Technology 2010年第7期26卷 584-588页

作者： Dongmei Ban,Ningsheng Xu,Shaozhi Deng,Jun Chen and Juncong She state key Lab of Optoelectronic Materials and Technologies,Guangdong Province key laboratory of Display Material and Technology,school of Physics and Engineering,sun yat-sen university,guangzhou 510275,china [a] state key Lab of Optoelectronic Materials and Technologies Guangdong Province key laboratory of Display Material and Technology school of Physics and Engineering sun yat-sen university guangzhou 510275 china

A simple method is introduced for the preparation of large-area films of molybdenum trioxide （MoO3） microbelts. It is found that such films can be grown on indium tin oxide （ITO） glasses or silicon substrates at low temperatures by thermal evaporation deposition in air without using catalyst. Field emission measurements show that the turn-on field of the MoO3 microbelts is as low as 2.2 V/μm required to obtain a current density of 10 μA/cm^2, The combination of the simplicity of the growth method and the attractive field emission performance makes it a potential low-cost technique for the preparation of large-area field emission cold cathode material.

关键词： Field emission Large-area film Molybdenum trioxide Microstructures and synthesis

^(40)Ar/^(39)Ar chronology and geochemistry of high-K volcanic rocks in the Mangkang basin, Tibet

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Science china Earth sciences 2005年第1期48卷 1-12页

作者： ZHANG Huihua, HE Huaiyu, WANG Jianghai & XIE Guanghong guangzhou Institute of Geochemistry, Chinese Academy of sciences, guangzhou 510640, china Institute of Geology and Geophysics, Chinese Academy of sciences, Beijing 100029, china College of life sciences, sun yat-sen university, guangzhou 510275, china 1. Chinese Academy of sciences Guangzhou Institute of Geochemistry 510640 Guangzhou China 2. Chinese Academy of sciences Institute of Geology and Geophysics 100029 Beijing China 3. College of life sciences Sun Yat-Sen University 510275 Guangzhou China

Our two newly obtained high-quality 40Ar/39Ar ages suggest that the high-K volcanic rocks of the Lawuxiang Formation in the Mangkang basin, Tibet were formed at 33.5 ( 0.2 Ma. The tracing of elemental and Pb-Sr-Nd isotopic geochemistry indicates that they were derived from an EM2 enriched mantle in continental subduction caused by transpression. Their evidently negative anomalies in HFSEs such as Nb and Ta make clear that there is an input of continental material into the mantle source. The high-K rocks at 33.5 ( 0.2 Ma in the Mangkang basin may temporally, spatially and compositionally compare with the early one of two-pulse high-K rocks in eastern Tibet distinguished by Wang J. H. Et al., implying that they were formed in the same tectonic setting.

关键词： Cenozoic high-K volcanic rocks, 40Ar/39Ar chronology, Mangkang basin, Tibet.

Vegetation Restoration and its effect on Carbon Balance in Guangdong Province,china

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Vegetation Restoration and its effect on Carbon Balance in G...

Promoter polymorphism of MRP1 associated with reduced survival in hepatocellular carcinoma

中国生态学会2006学术年会

作者： SHAOLIN PENG (state key laboratory of biocontrol,school of life sciences,sun yat-sen university,guangzhou 510275,china)

The significance of the regional carbon(C)balance of vegetation restoration to global change was studied in the most populated Guangdong *** percentage of the forest land cover of the province increased steadily from 26.23% in 1979 to 50.11% in 1998 owing to restoration of *** this period,the area increase in the conifer forest was 424.83 10hm,while the

关键词： CO2 sequestration global change vegetation restoration forest

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World Journal of Gastroenterology 2010年第48期16卷 6104-6110页

作者： Jing Zhao,Bing-Yun Yu,Jin-E Yang,key laboratory of Gene Engineering of the Ministry of Education,school of life sciences,sun yat-sen (Zhongshan) university,guangzhou 510275,Guangdong Province,china Dao-Yuan Wang,Department of Medical Oncology,The First Affiliated Hospital of guangzhou Medical College,guangzhou 510120,Guangdong Province,china key laboratory of Gene Engineering of the Ministry of Education School of Life Sciences Sun Yat-sen (Zhongshan) University Xin Gang Xi Road 135# Guangzhou 510275 Guangdong Province China. lssyje@***

AIM:To investigate the effect of the G-1666A polymorphism in the multidrug resistance related protein-1 (MRP1) on outcome of hepatocellular carcinoma (HCC). METHODS:A cohort of 162 patients with surgically resected HCC who received no postsurgical treatment until relapse was studied. Genotyping was performed by polymerase chain reaction-restriction fragment length polymorphism analysis. Electrophoretic mobility shift assay (EMSA) was used to evaluate the influence of the G-1666A polymorphism on the binding affinity of the MRP1 promoter with its putative transcription factors. RESULTS:Kaplan-Meier analysis showed that patients with GG homologues had a reduced 4-year disease-free survival compared with those carrying at least one A allele (P = 0.011). Multivariate Cox regression analysis indicated that the-1666GG genotype represented an independent predictor of poorer disease-free survival [hazard ratio (HR) = 3.067,95% confidence interval (CI):1.587-5.952,P = 0.001],and this trend became worse in men (HR = 3.154,95% CI:1.604-6.201,P = 0.001). A similar association was also observed between 4-year overall survival and the polymorphism in men (HR = 3.342,95% CI:1.474-7.576,P = 0.004). Moreover,EMSA suggested that the G allele had a stronger binding affinity to nuclear proteins. CONCLUSION:The MRP1-1666GG genotype predicted a worse outcome and was an independent predictor of poor survival in patients with HCC from Southeast china.

关键词： Multidrug resistance related protein-1 Single nucleotide polymorphism Hepatocellular carcinoma Prognosis

Perceptual video hashing robust against geometric distortions

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Science china(Information sciences) 2012年第7期55卷 1520-1527页

作者： XIANG ShiJun 1,4 ,YANG JianQuan 2 & HUANG JiWu 3 1 school of Information Science and Technology,Jinan university,guangzhou 510632,china 2 Shenzhen Institutes of Advanced Technology,Chinese Academy of sciences,Shenzhen 518055,china 3 school of Information Science and Technology,sun yat-sen university,guangzhou 510275,china 4 state key laboratory of Information Security,Institute of Software,Chinese Academy of sciences,Beijing 100049,china 1. school of Information Science and Technology Jinan University Guangzhou 510632 China4. State Key Laboratory of Information Security Institute of Software Chinese Academy of Sciences Beijing 100049 China2. Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 China3. School of Information Science and Technology Sun Yat-sen University Guangzhou 510275 China

In this paper,we propose a robust perceptual hashing algorithm by using video luminance histogram in *** underlying robustness principles are based on three main aspects:1) Since the histogram is independent of position of a pixel,the algorithm is resistant to geometric deformations; 2) the hash is extracted from the spatial Gaussian-filtering low-frequency component for those common video processing operations such as noise corruption,low-pass filtering,lossy compression,etc.; 3) a temporal Gaussian-filtering operation is designed so that the hash is resistant to temporal desynchronization operations,such as frame rate change and *** a result,the hash function is robust to common geometric distortions and video processing *** results show that the proposed hashing strategy can provide satisfactory robustness and uniqueness.

关键词： video hashing geometric distortion histogram Gaussian filtering

The spatial and temporal distribution of microalgae in the South china Sea:evidence from GIS-based analysis of 18S rDNA sequences

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Science china(life sciences) 2008年第12期51卷 1121-1128页

作者： LI LüYan1, HUANG QiaoJuan1, WU ShuHui1, LIN Duan2, CHEN JiaHui2 & CHEN YueQin1 1 key laboratory of Gene Engineering of the Ministry of Education, state key laboratory for biocontrol, sun yat-sen university, guangzhou 510275, china 2 South china Sea Environmental Monitoring Center, state Oceanic Administration, guangzhou 510300,china 1. key laboratory of Gene Engineering of the Ministry of Education State Key Laboratory for Biocontrol Sun Yat-Sen University Guangzhou 510275 China 2. South china Sea Environmental Monitoring Center State Oceanic Administration Guangzhou 510300 China

The purpose of this study was to estimate the spatial and temporal variation of microalgae in the South china Sea and to demonstrate the environmental factors controlling the diversity of microalgae by GIS (geographic information system)-based analysis of 18S rDNA sequences. Six 18S rDNA libraries were constructed from environmental samples collected at different sites in the study area, and more than 600 18S rDNA sequences were determined. The rDNA sequence data were then analyzed by DIVA-GIS software to display the spatial and temporal variation of phytoplankton’s composition. It was shown that the autotrophic eukaryotic plankton dominated over the heterotrophic cells in most of our clone libraries, and the dominating phytoplankton was Dinophyceae except for Bacillariophyta at the Xiamen harbor. The percentages of these two groups were controlled by water temperature and salinity. Our results also revealed that the species composition of Chlorophyta showed a close relationship with latitude, changing from Prasinophyceae at the high latitude to Trebouxiophyceae at the low latitude. Several newly classified picoplankton lineages were first uncovered in the South china Sea, including the pico-sized green alga Ostreococcus sp. and Picochlorum eukaryotum, and picobiliphytes, which was just discovered in 2007 with unknown affinities to other eukaryotes. Their spatial and temporal variation were also analyzed and discussed.

关键词： microalgae GIS-based analysis 18S rDNA South china Sea