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Efficient construction of provably secure steganography under ordinary covert channels

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Science China(Information Sciences) 2012年第7期55卷 1639-1649页

作者： AHN gail-Joon School of Computing Informaticsand Decision Systems EngineeringArizona State University

Steganography is the science of hiding information within seemingly harmless messages or innocent *** paper addresses the problems of efficient construction of secure steganography in ordinary covert *** relying on any sampling assumption,we provide a general construction of secure steganography under computational *** results show that unpredictability of mapping function in covertext sampler is indispensable for secure stegosystem on indistinguishability against adaptive chosen hiddentext *** completely prove that computationally secure steganography can be constructed on pseudorandom function and unbiased sampling function under ordinary covert channels,that is,its security is inversely proportional to the sum of errors of these two functions,as well as the legth of *** importantly,our research is not dependent upon pseudorandom ciphertext assumption of cryptosystem or perfect sampling ***,our results are practically useful for construction and analysis of secure stegosystems.

关键词： steganography cryptography indistinguishability sampler unpredictability adversary models

Zero-knowledge proofs of retrievability

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Science China(Information Sciences) 2011年第8期54卷 1608-1617页

作者： AHN gail-Joon School of Computing Informatics and Decision Systems Engineering Arizona State University

Proof of retrievability (POR) is a technique for ensuring the integrity of data in outsourced storage *** this paper,we address the construction of POR protocol on the standard model of interactive proof *** propose the first interactive POR scheme to prevent the fraudulence of prover and the leakage of verified *** also give full proofs of soundness and zero-knowledge properties by constructing a polynomial-time rewindable knowledge extractor under the computational Diffie-Hellman *** particular,the verification process of this scheme requires a low,constant amount of overhead,which minimizes communication complexity.

关键词： cryptography integrity of outsourced data proofs of retrievability interactive protocol zero- knowledge soundness rewindable knowledge extractor

Solving Delay Differential Equations through RBF Collocation

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Advances in Applied Mathematics and Mechanics 2009年第2期1卷 257-272页

作者： Francisco Bernal gail Gutierrez Institute for Scientific Computing Technical University of Dresden 01062 DresdenGermany Cir 1 No.73-34 Instituto de Energia y TermodinamicaUniversidad Pontificia BolivarianaMedellinColombia

A general and easy-to-code numerical method based on radial basis functions(RBFs)collocation is proposed for the solution of delay differential equations(DDEs).It relies on the interpolation properties of infinitely smooth RBFs,which allow for a large accuracy over a scattered and relatively small discretization ***’s multiquadric is chosen as RBF and combined with the Residual Subsampling Algorithm of Driscoll and Heryudono for support *** performance of the method is very satisfactory,as demonstrated over a cross-section of benchmark DDEs,and by comparison with existing general-purpose and specialized numerical schemes for DDEs.

关键词： Meshless method delay differential equations radial basis function multiquadric adaptive collocation

Assets and tactics in a mating market： Economic models of negotiation offer insights into animal courtship dynamics on the lek

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Current Zoology 2011年第2期57卷 225-236页

作者： gail L. PATRICELLI Alan H. KRAKAUER Richard MCELREATH Department of Evolution and Ecology University of California Davis CA 95616 USA Department of Anthropology University of California Davis CA 95616 USA

Economists study negotiation as a series of events--partner choice, information gathering, bargaining, etc.--with each step of the process affecting the outcome of the next, and the optimal decision at each stage depending on the player＇s bargaining power. The context in which these negotiations occur--the market--is critical, since players can adjust their behaviors in response to outside offers. Animals similarly are faced with sequential decisions regarding courtship： who to court, how to approach a potential mate, at what level to display, when to give up, etc. Thus economic models of negotiation in a market provide a framework in which we can view not just the outcome of courtship （assortative mating）, but also the process, where each sex can use tactics to improve their negotiating outcome, using the assets that they have available. Here we propose to use negotiation as a conceptual framework to explore the factors promoting tactical adjustments during sequential stages of courtship in lekking species. Our goal is to discuss the utility of negotiation as a heuristic tool, as well as the promise and peril of co-opting game theoretic models from economics to understand animal interactions. We will provide a brief overview of a few areas where we see promise for using negotiation as a framework to understand animal courtship dynamics： choice of a display territory, tactical partner choice for negotiation, approaching a potential partner and courtship haggling .

关键词： Bargaining Game theory Lek Sexual selection Signaling Negotiation

Migration of R28 Retinal Precursor Cells into Cochlear and Vestibular Organs

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Journal of Otology 2006年第1期1卷 51-56页

作者： gail Seigel Richard Salvi Dept. of Ophthalmology University at Buffalo Center for Hearing & Deafness & Dept. of Communicative Disorders & Sciences University at Buffalo

Damaged hair cells and neurons in the inner ear generally can not be replaced in mammals. The loss of these cells causes permanent functional disorders in both the cochlear and vestibular systems. Transplantation of retinal precursor cells, R28 cells, into inner ear tissue may help replace missing cells. The aim of the current project was to induce R28 cell transdifferentiation into cochlear and vestibular cell types under culture conditions. The first part was related to R28 cell labeling with DiI fluorescence that would help identify and track R28 cells. The second part involved co-culturing R28 cells in cochlear and vestibular organotropic cultures or isolated spiral ganglion neurons. The results suggest that R28 cells have the potential to differentiate into supporting cell types and spiral ganglion neurons in serum free medium, probably under the influence of diffusible signals from inner ear tissues. This information is useful for future efforts in inducing stem cell differentiation in the inner ear to replace lost sensory and neural cells.

关键词： retinal precursor cells cochlea vestibule spiral ganglion neuron culture

Validating a tool to assess eye health knowledge, attitude and practice in Cambodia and Vietnam

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International Journal of Ophthalmology(English edition) 2019年第11期12卷 1767-1774页

作者： Noela Prasad gail M Ormsby Robert P Finger Institute for Health and Sport Victoria UniversityMelbourneVIC 3011Australia VACCHO CollingwoodVIC 3066Australia Professional Studies Faculty of BusinessEducationLaw and ArtsUniversity of Southern QueenslandWest StreetToowoombaQLD 4350Australia Lifestyle Research Centre Avondale College of Higher EducationCooranbongNSW 2265Australia Department of Ophthalmology University of BonnRegina-Pacis-Weg 3Bonn 53113Germany

AIM: To develop an eye health knowledge, attitude and practice(EH-KAP) field-based assessment tool for use in implementing effective eye health care ***: An instrument development and validation study. A Vietnam EH-KAP dataset were used to identify and eliminate redundant questions to develop a standardized tool. Face validity was assessed by the KAP survey team. Internal validity(congruency/criterion) was assessed by comparing descriptive analysis of two datasets(n=531;n=38) collected from the same sampling frame at different time points. Weighted scores were calculated for each construct. Kappa values for test-retest and inter-observer agreement were calculated to check the reliability of responses. The modified version was assessed by analysing the raw and ungrouped data. Responses were weighted and agreement was tested by comparing construct ***: Totally 38 respondents were included in this validation process(mean age 58.5 y). Mean scores for knowledge were 9.15(old questionnaire n=531) and 5.05(modified version). For attitude, the scores were 2.23 and 2.42, and for practice the scores were 3.33 and 2.21. Testretest agreement was between 62% to 93%(Kappa 0.24 to 0.86) for the ungrouped raw data, and 55% to 72%(Kappa 0.42 to 0.65) for KAP domain. Inter-observer Kappa value for ungrouped data was 0.37 and 0.45 for the weighted ***: This standardized tool applied at critical time points can assess trends in KAP within the same population and for comparison across groups. If used alongside a Rapid Assessment of Avoidable Blindness(RAAB), this tool provides a comprehensive perspective on eye-health of a population.

关键词： validation knowledge attitude practice eye health knowledge,attitude and practice questionnaire

Update of endoscopy in liver disease:More than just treating varices

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World Journal of Gastroenterology 2012年第5期18卷 401-411页

作者： Christoforos Krystallis gail S Masterton Peter C Hayes John N Plevris Centre for Liver and Digestive Disorders The Royal InfirmaryUniversity of EdinburghEdinburgh EH16 4SAUnited Kingdom

The management of complications in liver disease is often complex and *** has undergone a period of rapid expansion with numerous novel and specialized endoscopic modalities that are of increasing value in the investigation and management of the patient with liver *** this review,relevant literature search and expert opinions have been used to provide a brief overview and update of the current endoscopic management of patients with liver disease and portal *** main areas covered are safety of endoscopy in patients with liver disease,the use of standard endoscopy for the treatment of varices and the role of new endoscopic modalities such as endoscopic ultrasound,esophageal capsule,argon plasma coagulation,spyglass and endomicroscopy in the investigation and treatment of liver-related gastrointestinal and biliary *** is clear that the role of the endoscopy in liver disease is well beyond that of just treating *** the technology in endoscopy expands,so does the role of the endoscopist in liver disease.

关键词： Cirrhosis Portal hypertension Varices En-doscopic ultrasound Esophageal capsule Endoscopicretrograde cholangiopancreatography Endomicros-copy Spyglass

Nanocrystal-semiconductor interface： Atomic-resolution cross-sectional transmission electron microscope study of lead sulfide nanocrystal quantum dots on crystalline silicon

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Nano Research 2014年第2期7卷 219-227页

作者： Zachary Lingley Krishnamurthy Mahalingam Siyuan Lus gail J. Brown Anupam Madhukar Mork Family Department of Chemical Engineering and Materials Science University of Southern California Los Angeles California 90089 USA Air Force Research Laboratory Materials and Manufacturing Directorate Wright-Patterson Air Force Base Ohio 45433-7707 USA Department of Physics and Astronomy University of Southern California Los Angeles California 90089 USA

We report on a cross-sectional high resolution transmission electron microscope study of lead sulfide nanocrystal quantum dots （NCQDs） dispersed on electron-transparent silicon nanopillars that enables nearly atomically-resolved simultaneous imaging of the entire composite： the quantum dot, the interfacial region, and the silicon substrate. Considerable richness in the nanocrystal shape and orientation with respect to the substrate lattice is observed. The average NCQD-substrate separation is found to be significantly smaller than the length of the ligands on the NCQDs. Complementary photoluminescence measurements show that light emission from PbS NCQDs on silicon is effectively quenched which we attribute to intrinsic mechanisms of energy and charge transfer from PbS NCQDs to Si.

关键词： nanocrystal quantum dots semiconductor substrate interface atomic structure high resolutiontransmission electronmicroscopy energy and charge transfer solar cells

A Comparative Investigation of the Biodegradation Behaviour of Linseed Oil-Based Cross-Linked Composites Filled with Industrial Waste Materials in Two Different Soils

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Journal of Renewable Materials 2023年第3期11卷 1254-1268页

作者： Eglė Malachovskienė Danguolė Bridžiuvienė Jolita Ostrauskaitė Justina Vaičekauskaitė gailė Žalūdienė Biodeterioration Research Laboratory Nature Research CentreVilniusLT-08412Lithuania Department of Polymer Chemistry and Technology Kaunas University of TechnologyKaunasLT-50254Lithuania Laboratory of Bedrock Geology Nature Research CentreVilniusLT-08412Lithuania

The biodegradation of polymeric biocomposites formed from epoxidized linseed oil and various types of fillers(pine needles,pine bark,grain mill waste,rapeseed cake)and a control sample without filler was studied during 180 days of exposure to two types of forest soil:deciduous and *** weight loss,morphological,and structural changes of polymer composites were noticed after 180 days of the soil burial *** greatest weight loss of all tested samples was observed in coniferous forest soil(41.8%–63.2%),while in deciduous forest soil,it ranged between 37.7%and 42.3%.The most significant changes in the intensities of the signals evaluated by attenuated total reflectance infrared spectroscopy,as well as morphological changes determined by scanning electron microscopy,were assessed for polymer composite with rapeseed cake and specimen without filler in coniferous forest soil and are in a good agreement with weight loss *** significantly lower changes in weight loss,morphology,and structure of polymeric film with pine bark were noticed in both *** was suggested that fungi of Trichoderma,Penicillium,Talaromyces and Clonostachys genera are the possible soil microorganisms that degrade linseed oil-based cross-linked polymer ***,the novel polymer composites have the potential to be an environmentally friendly alternative to petroleum-based mulching films.

关键词： Polymer composites linseed oil industrial waste materials biodegradation soil burial