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Fast Fourier-Galerkin methods for first-kind logarithmic-kernel integral equations on open arcs

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science china Mathematics 2010年第1期53卷 1-22页

作者： WANG Bo1,WANG Rui2 & XU YueSheng3,4,1Academy of Mathematics and Systems science,Chinese Academy of sciences,Beijing 100190,china 2school of information science and Engineering,Graduate university of the Chinese Academy of sciences,Beijing 100190,china 3Department of Mathematics,Syracuse university,Syracuse,NY 13244,USA 4Department of Scientific Computing and Computer Applications,sun yat-sen university,guangzhou 510275,china 1. Academy of Mathematics and Systems science Chinese Academy of Sciences Beijing 100190 China2. School of Information Science and Engineering Graduate University of the Chinese Academy of Sciences Beijing 100190 China3. Department of Mathematics Syracuse University Syracuse NY 13244 USA4. Department of Scientific Computing and Computer Applications Sun Yat-sen University Guangzhou 510275 China

We propose a fully discrete fast Fourier-Galerkin method for solving an integral equation of the first kind with a logarithmic kernel on a smooth open arc,which is a reformulation of the Dirichlet problem of the Laplace equation in the *** optimal convergence order and quasi-linear complexity order of the proposed method are established.A precondition is *** this method with an efficient numerical integration algorithm for computing the single-layer potential defined on an open arc,we obtain the solution of the Dirichlet problem on a smooth open arc in the *** examples are presented to confirm the theoretical estimates and to demonstrate the efficiency and accuracy of the proposed method.

关键词： Dirichlet problem open arc singular boundary integral equations Fourier-Galerkin methods logarithmic potentials

Binding activity of H-Ras is necessary for in vivo inhibition of ASK1 activity

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Cell Research 2004年第2期14卷 148-154页

作者： Jun DU~(1,2*), Shao Hui CAI~(3,4), Zhe SHI~3, Fumihiko NAGASE~1 ~1Department of Medical technology, Nagoya university school of Health sciences, Aichi 461-8673, Japan. ~2school of Pharmaceutical science, sun yat-sen university, guangzhou, 510089, china. ~3Department of Immunology, Nagoya university Graduate and Faculty school of Medicine, Aichi, 466-8550, Japan. ~4College of Pharmacy, Jinan university, guangzhou, 510632, china. 2school of Pharmaceutical science Sun Yat-Sen University Guangzhou 510089 China. 4College of Pharmacy Jinan University Guangzhou 510632 China. 3Department of Immunology Nagoya University Graduate and Faculty School of Medicine Aichi 466-8550 Japan. 1Department of Medical technology Nagoya University School of Health Sciences Aichi 461-8673 Japan.

H-Ras is well known as one of the essential components of Ras/Raf/MEK/ERK cascade, which is a critical prosurvival signaling mechanism in most eukaryotic cells. Ras targets Raf/MEK/ERK cascade by integrating and transmitting extracellular signals from growth factor receptors to Raf, leading to the propagation of signals to modulate a serious of cellular survival events. Apoptosis signal-regulating kinasel (ASK1) serves as a general mediator of cell death because it is responsive to a variety of death signals. In this study, we found that H-Ras interacted with ASK1 to cause the inhibition of both ASK1 activity and ASK1-induced apoptosis in vivo, which was reversed only partially by addition of RafS621A, an antagonist of Raf, whereas MEK inhibitor, PD98059, and PI3K inhibitor, LY294002, did not disturb the inhibitory effect of H-Ras on ASK-1-induced apoptosis. Furthermore, by means of immunoprecipitate and kinase assays, we demonstrated that the interaction between H-Ras and ASK1 as well as the inhibition

关键词： H-Ras ASK1 apoptosis binding activity.

The Kalman Filtering of 2-D Systems in Fornasini-Marchesini Model

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The Kalman Filtering of 2-D Systems in Fornasini-Marchesini ...

Synthesis, DNA-binding and photocleavage studies of ruthenium(Ⅱ) complexes [Ru(btz)_3]^(2+) and [Ru(btz)(dppz)_2]^(2+)

第二十七届中国控制会议

作者： Yang Ran school of information science and technology,sun yat-sen university,guangzhou 510275,P.R.china

In this paper,the traditional Kalman filtering problem of two-dimensional systems is *** from the existing results which possess special constraints on filter structure,we propose an estimator without any structure constraint such that an exactly optimal solution to the minimization of the variance of estimation error can be *** to the existing 1-D Kalman filter,the proposed 2-D Kalman filter can also be computed recursively.

关键词： Kalman filtering Two-dimensional systems Fornasini-Marchesini model

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science china Chemistry 2009年第9期52卷 1504-1511页

作者： YU HuiJuan, HUANG ShuMei, KOU JunFeng, LI LvYing, JIA HaiNa, CHAO Hui & JI LiangNian MOE Laboratory of Bioinorganic and Synthetic Chemistry, school of Chemistry and Chemical Engineering, sun yat-sen university, guangzhou 510275, china MOE Laboratory of Bioinorganic and Synthetic Chemistry School of Chemistry and Chemical Engineering Sun Yat-Sen University Guangzhou China

Two new ruthenium(Ⅱ) complexes, [Ru(btz)3](ClO4)2 (1) and [Ru(btz)(dppz)2](ClO4)2 (2) (btz = 4,4′-bithi-azole, dppz = dipyrido[3,2-a:2′,3′-c]phenazine), have been synthesized and characterized by elemental analysis, 1H NMR, ES-MS and X-ray crystallography. The DNA binding behaviors of two complexes have been studied by spectroscopic and viscosity measurements. The results suggest that complex 1 binds to CT-DNA via an electrostatic mode, while complex 2 via an intercalative mode. Under irradiation at 365 nm, both complexes were found to promote the cleavage of plasmid pBR 322 DNA from supercoiled form Ⅰ to nicked form Ⅱ. The mechanism studies reveal that singlet oxygen 1O2 and hydroxyl radical (OH-) play a significant role in the photocleavage process.

关键词： ruthenium(Ⅱ) complex DNA binding DNA photocleavage PDT

Synthesis,crystal structures,electrochemical and spectroscopic properties of ruthenium(Ⅱ) complexes containing diamino-1,3,5-triazine derivatives

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science china Chemistry 2010年第10期53卷 2099-2105页

作者： CHEN Yu, XU WenChao, KOU JunFeng, WEI XuHui, YU BoLe, CHAO Hui & JI LiangNian MOE Laboratory of Bioinorganic and Synthetic Chemistry, school of Chemistry and Chemical Engineering, sun yat-sen university, guangzhou 510275, china 1. MOE Laboratory of Bioinorganic and Synthetic Chemistry School of Chemistry and Chemical Engineering Sun Yat-Sen University Guangzhou 510275 China

Three Ru(Ⅱ) complexes [Ru(bpy)2(1-IQTNH)](ClO4)2 (1), [Ru(bpy)2(2-QTNH)](ClO4)2 (2) and [Ru(bpy)2(3-IQTNH)](ClO4)2 (3) (bpy = 2,2′-bipyridine, 1-IQTNH = 6-(isoquinolin-1-yl)-1,3,5-triazine-2,4-diamine, 2-QTNH = 6-(quinolin-2-yl)-1,3,5-triazine-2,4-diamine, 3-IQTNH = 6-(isoquinolin-3-yl)-1,3,5-triazine-2,4-diamine) have been synthesized and characterized by elemental analysis, 1H NMR spectroscopy, electrospray ionization mass spectrometry and X-ray crystallography. The electrochemical and spectroscopic properties of the complexes differ from those of [Ru(bpy)3]2+ owing to the structural differences between the ligands and their complexes.

关键词： ruthenium(Ⅱ) complex diamino-1 3 5-triazine crystal structures electrochemistry spectroscopy

The three-dimensional structure of Infectious flacherie virus capsid determined by cryo-electron microscopy

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science china(Life sciences) 2009年第12期52卷 1186-1191页

作者： XIE Li1,4, ZHANG QinFen2·, LU XingMeng3, DAI XinHong2, LI KunPeng2, HONG Jian1,4· & ZHOU XuePing11 Institute of Biotechnology, Zhejiang university, Hangzhou 310029, china 2 State Key Laboratory of Biocontrol, school of Life sciences, sun yat-sen university, guangzhou 510275, china 3 College of Animal sciences, Zhejiang university, Hangzhou 310029, china 4 Center of Analysis and Measurement, Zhejiang university, Hangzhou 310029, china Institute of Biotechnology Zhejiang University Hangzhou 310029 China State Key Laboratory of Biocontrol School of Life Sciences Sun Yat-Sen University Guangzhou 510275 China College of Animal sciences Zhejiang University Hangzhou 310029 China Center of Analysis and Measurement Zhejiang University Hangzhou 310029 China

Cryo-electron microscopy and image reconstruction were used to determine the three-dimensional structure of Infectious flacherie virus (IFV). 5047 particles were selected for the final reconstruction. The FSC curve showed that the resolution of this capsid structure was 18 ·. The structure is a psuedo T=3 (P=3) icosahedral capsid with a diameter of 302.4 · and a single shell thickness of 15 ·. The density map showed that IFV has a smooth surface without any prominent protrude or depression. Comparison of the IFV structure with those of the insect picorna-like virus-Cricket paralysis virus (CrPV)and human picornavirus-Human rhinovirus 14 (HRV 14) revealed that the IFV structure resembles the CrPV structure. The "Rossmann canyon" is absent in both IFV and CrPV particles. The polypeptide topology of IFV VP2, IFV VP3 was predicted and the subunit location at the capsid surface was further analyzed.

关键词： Infectious flacherie virus cryo-electron microscopy three-dimensional structure polypeptide folding

OBLIVIOUS TRANSFER WITH ACCESS CONTROL AND IDENTITY-BASED ENCRYPTION WITH ANONYMOUS KEY ISSUING

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Journal of Electronics(china) 2011年第Z1期 571-579页

作者： Xu Lingling* Zhang Fangguo* Wen Yamin* ** *(school of information science and technology,sun yat-sen university,guangzhou 510275,china) **(school of Mathematics and Computational science,Guangdong university of Business Studies,guangzhou 510320,china)

In ACM’CCS 2009,Camenisch,et *** the Oblivious Transfer with Access Control(AC-OT) in which each item is associated with an attribute set and can only be available,on request,to the users who have all the attributes in the associated ***,AC-OT achieves access control policy for conjunction of ***,the functionality of AC-OT is equivalent to the sim-plified version that we call AC-OT-SV:for each item,one attribute is associated with it,and it is requested that only the users who possess the associated attribute can obtain the item by *** one hand,AC-OT-SV is a special case of AC-OT when there is just one associated attribute with each *** the other hand,any AC-OT can be realized by an *** this paper,we first present a concrete AC-OT-SV protocol which is proved to be secure in the model defined by Camenisch,et al..Then from the protocol,interestingly,a concrete Identity-Based Encryption(IBE) with Anonymous Key Issuing(AKI) is given which is just a direct application to *** comparison,we show that the AKI protocol we present is more efficient in communications than that proposed by Chow.

关键词： Oblivious Transfer(OT) Access Control(AC) Identity-Based Encryption(IBE) Anonymous Key Issuing(AKI)

Energy-Efficient Routing Scheme for Distributed Regression in Wireless sensor Network

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The endocrine regulation network of growth hormone synthesis and secretion in fish: Emphasis on the signal integration in somatotropes

第二十七届中国控制会议

作者： Hou Chaojun,Wang Guoli school of information science & technology,sun yat-sen university,guangzhou 510275,P.R.china

This paper presents an energy-efficient routing scheme for the in-network implementation of data regression modelling in wireless sensor networks（WSNs） .With the kernel based distributed representation,a clustering based routing architecture is proposed to implement the distributed Gaussian elimination for solving the regression algebraic *** particular,the skeleton routing tree is built to coordinate the local computations associated with the *** rest ramose nodes within each cluster are limited to contribute the corresponding local *** with the junction tree formation over all nodes,the notion of skeleton tree（ST） proposed here suppresses the redundant message passing among the ramose nodes with each cluster without deteriorating data modelling *** results are reported to demonstrate the effectiveness of the proposed approach.

关键词： Wireless sensor networks Routing Distributed computation Data acquisition Regression

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science china(Life sciences) 2010年第4期53卷 462-470页

作者： LI WenSheng & LIN HaoRan State Key Laboratory of Biocontrol, Institute of Aquatic Economic Animals and the Guangdong Provincial Key Laboratory for Aquatic Economic Animals, school of Life sciences, sun yat-sen university, guangzhou 510275, china 1. State Key Laboratory of Biocontrol Institute of Aquatic Economic Animals and the Guangdong Provincial Key Laboratory for Aquatic Economic Animals School of Life Sciences Sun Yat-sen University Guangzhou 510275 China

In teleosts, growth hormone (GH) production is governed by multiple neuroendocrine factors from the hypothalamus and other regulators from the pituitary and peripheral organs. Exploring the principles followed by pituitary somatotropes when differentiating and integrating the signals from these regulators at the cellular and intracellular level is essential for understanding the endocrine regulation network of growth hormone synthesis and secretion in fish. This paper discusses recent advances in the action mechanisms of GH regulation factors, including the neuroendocrine regulators, pituitary level factors and peripheral factors, primarily involved in their receptor systems as well as in post-receptor signal transduction pathways.

关键词： fish growth hormone receptor signal transduction