bluuebunny/crossref_metadata_2025 huggingface dataset:
DC TOLERANCE ANALYSIS OF NONLINEAR CIRCUITS USING SET-VALUED FUNCTIONS
Authors: YAMAMURA KIYOTAKA , HAGA YASUAKI
Published: February 2009

In the tolerance analysis of electronic circuits, the concept of set-valued function is often useful. In this paper, an efficient algorithm is proposed for finding all solution sets of nonlinear resistive circuits described by systems of nonlinear equations containing set-valued functions termed piecewise-trapezoidal (PWT) functions. By numerical examples, the effectiveness of the proposed algorithm is confirmed from various viewpoints. It is also shown that the proposed algorithm could find all solution regions to a system of 1000 PWT equations in practical computation time.
LIMIT CYCLES IN 3D LOTKA–VOLTERRA SYSTEMS APPEARING AFTER PERTURBATION OF HOPF CENTER
Authors: GOŁASZEWSKI Ł. J. , SŁAWIŃSKI P. , ŻOŁADEK H.
Published: February 2009

We study the system ẋ = x(y+2z+(15/2η2)u), ẏ = y(x-2z-(7/2η2)u), ż = -z(x+y+(4/η2)u), u = x+y+z-1, and its two-parameter perturbations. We show that before perturbation there exists a one-parameter family of periodic solutions obtained via a nondegenarate Hopf bifurcation and after perturbation there remains at most one limit cycle of small amplitude and bounded period. Moreover, we found that a secondary Hopf bifurcation to an invariant torus occurs after the perturbation.
BIAS REDUCTION OF THE NEAREST NEIGHBOR ENTROPY ESTIMATOR
Authors: KALTCHENKO ALEXEI , TIMOFEEVA NINA , TIMOFEEV EUGENIY A.
Published: February 2009

A new family of entropy estimators, constructed as a linear combination (weighted average) of nearest neighbor estimators with slightly different individual properties, is proposed. It is shown that a special suboptimal selection of the coefficients in the linear combination results in a polynomial reduction of the estimator's bias, which continues the line of work of P. Grassberger on entropy estimation. Computer simulation results are provided.
PARTNER ASSESSMENT AS A KEY TO ENTREPRENEURIAL SUCCESS: TOWARDS A BALANCED SCORECARD APPROACH
Authors: ROESSL DIETMAR , FINK MATTHIAS , KRAUS SASCHA
Published: February 2009

It is a key factor for entrepreneurial success to identify and to assess potential partners. The authors discuss traditional methods of evaluating cooperation relationships and cooperation partners and develop an integrative tool to assist with partner evaluation. Evaluations can tie in with the characteristics of the partners and the relationships. However, due to the lack of a theoretical foundation such checklists can only be interpreted on the basis of considerations of plausibility. Alternatively, it is possible to evaluate the resources exchanged. However, this view limits the evaluation to only one central aspect, neglecting the problem's complexity. Against this backdrop, we propose an integrative evaluation tool for (potential) cooperation partners using the formal structure of the Balanced Scorecard and discuss its advantages and limitations.
THE IMPACT OF GENDER AND RACE IN VENDOR SELECTION
Authors: MARTIN MARILYN M. , SIMMERMAN JAMES
Published: February 2009

Do gender and race count as factors in accessing qualities of leadership for entrepreneurs? Data collected from the Support American Made (SAM) program initiated by Wal-Mart Stores, Inc. as a vendor-screening program for smaller manufacturers' provided some interesting insights on gender and race in vender selection. The results of this study found no difference in product evaluations based on either race or gender. Thus, both should be non-issues in product selection. While some differences in management practices where found, these differences favor the minority enterprise. When it comes to vendor selection, buyers should be color blind as well as indifferent to gender.
SUCCESSFUL MANAGEMENT OF INTRACTABLE INFECTION AFTER LIMB-SAVING SURGERY: A CASE REPORT
Authors: Kimura Hiroaki , Tsuchiya Hiroyuki , Shirai Toshiharu , Hayashi Katsuhiro , Hisakado Hiroshi , Takeuchi Akihiko , Tomita Katsuro
Published: February 2009

Infections following limb-saving surgeries still happen frequently and are refractory to treatment, even though the treatment of massive bone defects caused by bone resection of bone tumors has improved gradually. Once infections become intractable, they generally result in amputations in spite of all kinds of treatment. We report the case of a patient who developed an intractable infection after limb-saving surgery utilizing a massive frozen autograft and a tumor prosthesis, but whose limb was finally successfully salvaged by multiple surgical interventions. We conclude that continued perseverance in treatment after infections may enable preservation of the limb and restoration of good function.
TRANSIENT RESPONSE ANALYSIS OF THE EUKARYOTIC CHEMOSENSORY SYSTEM TO INTRA-CELLULAR FLUCTUATIONS
Authors: PATNAIK PRATAP R.
Published: February 2009

Like prokaryotic cells, those of eukaryotes are also subjected to noise from within the cells. While the cells have a built-in mechanism to attenuate the noise, conditions may arise where this is beyond the cell's ability to regulate. Start-up perturbations and those induced by metabolic shifts are examples of such situations. Then, it becomes useful to understand how the cells respond. For a eukaryotic chemosensory system, this has been studied by applying response coefficient analysis to a recent model. With even three dependent variables — an activator, an inhibitor, and a response element — the response coefficients differ widely with time and from one variable to another. These differences are interpreted in terms of the chemosensory mechanism and its robustness. The results complement similar recent studies of Escherichia coli chemotaxis, thus supporting their credibility and versatility.
HYBRID MODELING IN BIOCHEMICAL SYSTEMS THEORY BY MEANS OF FUNCTIONAL PETRI NETS
Authors: WU JIALIANG , VOIT EBERHARD
Published: February 2009

Many biological systems are genuinely hybrids consisting of interacting discrete and continuous components and processes that often operate at different time scales. It is therefore desirable to create modeling frameworks capable of combining differently structured processes and permitting their analysis over multiple time horizons. During the past 40 years, Biochemical Systems Theory (BST) has been a very successful approach to elucidating metabolic, gene regulatory, and signaling systems. However, its foundation in ordinary differential equations has precluded BST from directly addressing problems containing switches, delays, and stochastic effects. In this study, we extend BST to hybrid modeling within the framework of Hybrid Functional Petri Nets (HFPN). First, we show how the canonical GMA and S-system models in BST can be directly implemented in a standard Petri Net framework. In a second step we demonstrate how to account for different types of time delays as well as for discrete, stochastic, and switching effects. Using representative test cases, we validate the hybrid modeling approach through comparative analyses and simulations with other approaches and highlight the feasibility, quality, and efficiency of the hybrid method.
A SCHEME FOR IMPLEMENTATION OF DENSE CODING WITH W-CLASS STATES IN CAVITY QED
Authors: YE LIU , HE JUAN
Published: February 2009

An experimentally feasible scheme for implementing quantum dense coding in cavity QED is proposed. In the scheme a W-class state can first be prepared by letting the atoms interact simultaneously with a highly detuned cavity mode. Then the states coded on this W-class state can be exactly distinguished by detecting atomic states. The scheme is insensitive to the cavity field, and the quantum dense coding can be realized in a simple way.
THREE-COLOR CONTINUOUS-VARIABLE ENTANGLEMENT DIRECTLY PRODUCED IN AN OPTICAL SUPERLATTICE
Authors: YU Y. B. , SHI Z. T. , WANG H. T. , QIN Y. F. , LAI L. F. , JIN S. H. , ZHU S. N. , YU X. Q. , WANG J. F. , XU P. , LENG H. Y.
Published: February 2009

The three-color continuous-variable entanglement directly produced by a cascaded nonlinear process in an optical superlattice was investigated theoretically. This cascaded nonlinear process can be realized by using quasi-phase-matching technique in a quasiperiodic superlattice. In the first step, signal- and idle-beams can be generated by a parametric down-conversion. Then, the third beam can be obtained through sum-frequency of idle and pump. The degree of quadrature phase amplitude correlations between the three modes was discussed by a sufficient inseparability criterion with a single inequality for continuous-variable entanglement.
TARGETED QUANTUM SEARCH: REDUCES THE TIME AND COST FOR SEARCHING FOR OBJECTS IN MULTIPLE-SERVER PEER-TO-PEER NETWORKS
Authors: PHANEENDRA H. D. , SHIVAKUMAR M. S.
Published: February 2009

In a number of Internet applications, we need to search for objects to download them. This includes peer-to-peer (P2P) file sharing, grid computing and content distribution networks. Here the single object will be searched for in multiple servers. There are many searching algorithms in existence today for this purpose based on the concept of classical physics and classical algorithms. The principles of quantum mechanics can be used to build and analyze a quantum computer and its algorithms. Quantum searching is such an algorithm. In this paper we are proposing a search method based on the quantum physics and quantum algorithms. Our method, the targeted quantum search is found to be more cost effective than any other classical searching algorithms like linear and two-way linear, simulated annealing, including broadcast based searching. Our targeted quantum search method is analyzed and simulated to show the best results.
CLASSIFICATION OF DENSITY MATRICES FOR A FOUR-STATE SYSTEM
Authors: MENDAŠ ISTOK
Published: February 2009

Properties and structure of the 15-dimensional parameter space of four-state density matrices are examined using the SU(4) generator expansion. Appropriate classification of one-, two- and three-parameter density matrices is obtained, based on the sameness of the characteristic polynomial of density matrices belonging to a given type. It is found that in the one parameter case of 15 different density matrices only three distinct types exist, while in the two parameter case 105 different density matrices group into 11 distinct types. In the three parameter case appropriate classification of 455 different density matrices into 44 types is determined. Two- and three-dimensional cross sections of the space of generalized Bloch vectors are illustrated by randomly drawing matrices for several types of density matrices, providing some insight into the intricate and complex structure of the space of density matrices for a four-state system. Positions of the representative points corresponding to the pure states are found for all types. Global properties of observables are determined by generating, by the Monte Carlo sampling method, and averaging over nearly all density matrices pertaining to a given type.
CONTINUOUS-VARIABLE ENTANGLEMENT OF THE CAVITY AND EXCITON MODE
Authors: WU E. , ZHANG XIAO-AN , WANG XI-MING , ZENG LI-XIA
Published: February 2009

We consider a semiconductor quantum well in the excitation system. Applying the pertinent Hamiltonian, we investigate the second-order intensity correlation function and the entanglement properties between the cavity and exciton mode. It is found that nonclassical (antibunching) effect and sudden death effect occur in our system.
A MULTISCALE CRYSTAL PLASTICITY ANALYSIS OF DEFORMATION IN A TWO-PHASE STEEL
Authors: GASKELL JILLIAN , DUNNE FIONN , FARRUGIA DIDIER , LIN JIANGUO
Published: February 2009

A rate- and lengthscale-dependent crystal plasticity model is employed with a representative volume element for a two-phase austenitic steel under hot-forming conditions to investigate the role of austenite and MnS particle crystallographic orientation on local stress and slip conditions at austenite–MnS interfaces.

It was found that austenite–MnS particle interfacial stress magnifications are determined largely by the crystallographic orientation of the MnS and not significantly by the austenite orientations. However, the crystallographic orientation of an austenite grain neighboring a MnS particle has a dramatic effect on slip localization and slip magnitude in the absence of any significant change in interfacial stress magnitude. The results suggest that it is the crystallographic orientation of the MnS rather than that of the austenite which determines the onset and rapidity of void nucleation. The results also show that there are very particular combinations of austenite–MnS particle orientations which lead to the highest interfacial stresses, and that the peak stress magnification arises not from the properties of the second phase particles but from their orientation. Micromechanical models based on isotropic plasticity will not capture correctly the interfacial stresses.
MULTISCALE FINITE ELEMENT METHOD FOR HETEROGENEOUS MEDIA WITH MICROSTRUCTURES: CRACK PROPAGATION IN A POROUS MEDIUM
Authors: SOHN DONGWOO , LIM JAE HYUK , CHO YOUNG-SAM , IM SEYOUNG
Published: February 2009

A novel multiscale FE scheme is proposed for simulation of crack propagation in heterogeneous media. A fine scale mesh is constructed to model the crack tip and the microstructures around the near-tip field, while a coarse scale mesh is introduced to model the far field, wherein the effect of the microstructures is averaged through the homogenization theory to yield the average macroscopic constitutive relationship. The so-called variable node elements are subsequently employed to connect the fine scale zone in a seamless way to the coarse scale zone. The moving crack tip is modeled in a straightforward manner with the conventional quarter-point singular element. Several numerical examples are presented to demonstrate the scheme as an effective tool for multiscale simulation of crack propagation in consideration of the microstructures in a heterogeneous body.
NEURODYNAMICS OF CATEGORY LEARNING: TOWARDS UNDERSTANDING THE CREATION OF MEANING IN THE BRAIN
Authors: DELIANO MATTHIAS , OHL FRANK W.
Published: February 2009

Category learning, the formation and use of categories (equivalence classes of meaning), is an elemental function of cognition. We report our approach to study the physiological mechanisms underlying category learning using high-density multi-channel recordings of electrocorticograms in rodents. These data suggest the coexistence of separate coding principles for representing physical stimulus attributes ("stimulus representation") and subjectively relevant information (meaning) about stimuli, respectively. The implications of these findings for the construction of interactive cortical sensory neuroprostheses are discussed.
ON CRITICAL STATE TRANSITIONS BETWEEN DIFFERENT LEVELS IN NEURAL SYSTEMS
Authors: WERNER GERHARD
Published: February 2009

The framework of "Modern Theory of Critical State Transitions"1,2considers the relation between different levels of organization in complex systems in terms of critical state transitions. A state transition between levels entails changes of scale of observables and, concurrently, new formats of description at reduced dimensionality. It is suggested that this principle can be applied to the hierarchic structure of the nervous system, whereby the relations between different levels of its functional organization can be viewed as successions of state transitions: upon state transition, the 'lower' level presents to the 'higher' level an abstraction of itself, at reduced dimensionality and at a coarser scale. The re-scaling in the state transitions is associated with new objects of description, displays new properties and obeys new laws, commensurate to the new scale. To illustrate this process, some aspects of the neural events thought to be associated with cognition and consciousness are discussed. However, the intent is also more general in that state transitions between all levels of organization are proposed as the mechanisms by which successively higher levels of organization "emerge" from lower levels.
THE PHASE TRANSITION IN HUMAN COGNITION
Authors: SPIVEY MICHAEL J. , ANDERSON SARAH E. , DALE RICK
Published: February 2009

This article attempts to build a bridge between cognitive psychology and computational neuroscience, perhaps allowing each group to understand the other's theoretical insights and sympathize with the other's methodological challenges. In briefly discussing a collection of conceptual demonstrations, neural network and dynamical system simulations, and human experimental results, we highlight the importance of the concept of phase transition to understand cognitive function. Our goal is to show that viewing cognition as a self-organizing process (involving phase transitions, criticality, and autocatalysis) affords a more natural explanation of these data over traditional approaches inspired by a sequence of linear filters (involving detection, recognition, and then response selection).
MODELING GOAL-ORIENTED DECISION MAKING THROUGH COGNITIVE PHASE TRANSITIONS
Authors: KOZMA ROBERT , PULJIC MARKO , PERLOVSKY LEONID
Published: February 2009

Cognitive experiments indicate the presence of discontinuities in brain dynamics during high-level cognitive processing. Non-linear dynamic theory of brains pioneered by Freeman explains the experimental findings through the theory of metastability and edge-of-criticality in cognitive systems, which are key properties associated with robust operation and fast and reliable decision making. Recently, neuropercolation has been proposed to model such critical behavior. Neuropercolation is a family of probabilistic models based on the mathematical theory of bootstrap percolations on lattices and random graphs and motivated by structural and dynamical properties of neural populations in the cortex. Neuropercolation exhibits phase transitions and it provides a novel mathematical tool for studying spatio-temporal dynamics of multi-stable systems. The present work reviews the theory of cognitive phase transitions based on neuropercolation models and outlines the implications to decision making in brains and in artificial designs.
CATALYSIS, PERCEPTION, AND CONSCIOUSNESS
Authors: CARPENTER PATRICIA A. , DAVIA CHRISTOPHER J. , VIMAL RAM LAKHAN PANDEY
Published: February 2009

This paper describes and provides support for a non-representational theory of perception called the Fractal Catalytic theory, which proposes that perception is a catalytic type of process that occurs at multiple scales.1Enzyme catalysis involves a vibratory facilitation of a reaction. A catalytic model for smell at the molecular level is supported by evidence that smell involves a vibratory process.2This type of facilitation can be generalized to the neural level, where many neuroscientists have observed vibratory neural patterns. At the level of the organism, we describe research with blind individuals who experience a visuo-spatial world through patterns of sounds or tactile vibrations. Such research argues against the standard theory that people are representing objects and events, and supports the view that experience arises as an organism mediates (catalyzes) the transitions in its surround. The theory relates to the biologically-grounded theory of Autopoiesis3as well as proposals that catalysis is central in biological evolution. We examine the implications of this theory for the nature of consciousness.
NANOSTRUCTURED PARTICLES AND LAYERS FOR SENSING CONTAMINANTS IN AIR AND WATER
Authors: LIEBERZEIT PETER A. , REHMAN ABDUL , YAQUB SADAF , DICKERT FRANZ L.
Published: February 2009

Chemical sensor layers for environmental applications require optimal selectivity, sensitivity, and long term stability, which can be achieved in artificial matrices. For detecting thiols in air, reversible affinity interactions can be optimized by varying the stoichiometry of molybdenum disulphide nanoparticles to achieve sulphur deficiencies. Generating MoS1.9 increases the quartz crystal microbalance (QCM) sensor responses towards butane thiol by a factor of three. Artificial recognition sites are accessible by molecular imprinting: acrylate copolymers can be tuned in polarity to interact selectively with atrazine in water leading to detection limits below one ppb with QCM sensors. Finally, sensor arrays coated with six different molecularly imprinted polymers (MIP) correctly reproduce the ethyl acetate concentration of a composter over a period of two weeks validated by GC-MS measurements.
GAMMA RADIATION AND OZONE SENSING USING MIXED OXIDE THIN FILMS
Authors: KOROSTYNSKA O. , ARSHAK K. , HICKEY G.
Published: February 2009

Gamma radiation and ozone sensing properties of mixed oxides in the form of thermally evaporated thin films are explored. External effects, such as radiation and ozone cause defects in the materials they interact with, cause changes in the material properties. An Edwards E306A thermal coating system was used for the mixed oxides thin films deposition. Cu electrodes were manufactured on the substrate via thermal evaporation, photoresist was spin-coated over it and was exposed to UV light via acetate containing the desired inter-digitated electrode patterns. After the exposure, the substrate was placed in a developer solution and then rinsed in water and placed in the etching solution to reveal the electrode pattern. The optical properties of the films were explored using CARY 1E UV-Visible Spectrophotometer. The influence of gamma radiation on the electrical properties of the films was traced via the measurements of conductance versus radiation dose, which were recorded in real-time using HP 4277A LCZ impedance analyzer at a frequency of 1 kHz. The fact that the explored thin films were sensitive to both gamma radiation and ozone exposure enables the development of cost-effective real-time monitoring system for personnel protection and environmental monitoring. This novel approach would allow the manufacture of the sensor system with multiple sensor heads during one technological process, whereas various shielding materials or pattern recognition could be employed to differentiate between the effects of ozone and gamma radiation on the mixed oxide thin film sensors.
INTEGRATING NANOSCALE ZERO-VALENT IRON AND TITANIUM DIOXIDE FOR NUTRIENT REMOVAL IN STORMWATER SYSTEMS
Authors: CHANG NI-BIN , WANIELISTA MARTY , HOSSAIN FAHIM , ZHAI LEI , LIN KUEN-SONG
Published: February 2009

Nutrients, such as nitrate, nitrite, and phosphorus, are common contaminants in many aquatic systems in the United States. Ammonia and nitrate are both regulated by the drinking water standards in the US primarily because excess levels of nitrate might cause methemoglobinemia. Phosphorus might become sources of the eutrophication problems associated with toxic algae in the freshwater bodies. Toxic algal blooms can cause severe acute and chronic public health problems. Chemical reduction of nitrate by using zero-valent iron started as early as 1964, and considerable research reports relating to this technology to nanomaterial were extensively reported in 1990s making the use of nanoscale zero-valent iron (NZVI) particles for nitrate removal become one of the most popular technologies in this field. The purpose of the present study was to examine the potential of integrating green sorption media, such as sawdust, limestone, tire crumb, and sand/silt, with two types of nanoparticles, including NZVI and Titanium Dioxide ( TiO 2), for nitrate removal in an engineering process. The study consists of running packed bed column tests followed by the addition of NZVI and TiO 2 to improve nitrate and phosphorus removal efficiency. Preliminary results in this paper show that the potential and advanced study may support the creation of design criteria of stormwater and groundwater treatment systems for water reuse in the future.
SYNTHESIS AND CHARACTERIZATION OF TITANIA NANOTUBES FOR DYE WASTEWATER TREATMENT
Authors: LIN KUEN-SONG , LO CHAO-CHUN , CHANG NI-BIN
Published: February 2009

This paper starts with the preparation of anatase titania nanotube (TN) in large quantities by hydrothermal routes with different calcination temperatures, and then delves into a thorough investigation for the characterization of fine structures or formation mechanism of TN. Experimentally, anatase TiO 2 nanoparticle was used as a precursor for TN synthesis. The results showed that the length and diameter of TN range are 50–100 nm and 10–15 nm, respectively. The XRD patterns and BET isotherms indicated that TN owns anatase-typed structures with a surface area of 292m2/g. By extended X-ray absorption fine structure (EXAFS) spectra, the valency and framework of TN are Ti (IV) with octahedral structures. The EXAFS data also revealed that TN has a first shell of Ti – O bonding with bond distances of 1.95 Å and coordination numbers were 2. The results revealed that the TiO 2 anatase nanoparticles can be solved into layer under strong alkaline. The layer of TN further curling itself to reduce the energetics was postulated and found. For calcination temperature larger than 400°C, the microstructure of TN might transform from nanotube into nanoparticles accompanying with the sharp increase for the nanoparticle crystalline phase. With the understanding of pore structure variation on the basic dye (Basic Green 5 (BG5)), the adsorption ability, mechanisms, and kinetics of (Basic Green 5 (BG5)) dye onto TN were examined as well.
TOWARDS STANDARD TEST COLLECTIONS FOR THE EMPIRICAL EVALUATION OF SEMANTIC WEB SERVICE APPROACHES
Authors: KÜSTER ULRICH , KÖNIG-RIES BIRGITTA
Published: February 2009

Semantic web services have received a significant amount of attention in the last years and many frameworks, algorithms and tools leveraging them have been proposed. Nevertheless surprisingly little effort has been put into the evaluation of the approaches so far. The main blocker of thorough evaluations is the lack of large and diverse test collections of semantic web services. In this paper we analyze requirements on such collections and shortcomings of the state-of-the-art in this respect. Our contribution to overcoming those shortcomings is OPOSSum, a portal to support the community to build the necessary standard semantic web service test collections in a collaborative way. We discuss how existing test collections have been integrated with OPOSSum, showcase the benefits of OPOSSum by an illustrative use case and outline next steps towards better standard test collections of semantic web services.
SEMANTICS IN DIGITAL PHOTOS: A CONTENXTUAL ANALYSIS
Authors: SINHA PINAKI , JAIN RAMESH
Published: February 2009

Interpreting the semantics of a photo is a hard problem. However, for storing and indexing large multimedia collections, it is essential to build systems that can automatically extract semantics from digital photos. In this research we show how we can fuse content and context to extract semantics from digital photographs. Our experiments show that if we can properly model context associated with media, we can interpret semantics using only a part of high dimensional content data.
De Boor-Fix dual functionals for transformation from polynomial basis to convolution basis
Authors: Stefanus Lim Yohanes
Published: February 2009

Basis transformation plays a central role in data representations and in many problem solving techniques such as Fourier transform and wavelet transform. A pertinent basis gives pertinent information. Dual functionals are a mathematical tool for basis transformation. This work presents, from the perspective of algebraic computing, a generalization of the de Boor-Fix dual functionals for the Bernstein basis functions to the case of the convolution basis functions. The convolution basis functions can be characterized as polar forms of the corresponding Bernstein basis functions. These new dual functionals can be used for computing algebraically the expansion coefficients of any polynomial over the convolution basis which has applications in computer-aided geometric design and secret information encoding.
Absolute factoring of bidegree bivariate polynomials
Authors: Chèze G. , Elkadi M. , Galligo A. , Weimann M.
Published: February 2009

We describe an efficient algorithm and an implementation for computing an absolute factorization of a bivariate polynomial with a given bidegree. Results of experimentation and an illustrative example are provided. This algorithm is a generalization of the previous one by Rupprecht-Galligo-Chèze which works after a generic change of coordinates. It relies on a general algorithmic approach based on a study of the curve defined by the polynomial to factorize in a toric surface.
Factoring univariate polynomials over the rationals
Authors: Novocin Andy , van Hoeij Mark
Published: February 2009

We present an algorithm for factoring a polynomial, f , in one variable with rational coefficients. Our algorithm is a variant of the Belabas [Belabas] version of the van Hoeij [van Hoeij] factoring algorithm. Our algorithm not only contains a practical speed-up over Belabas' but it also allows us to prove a new complexity result for factoring polynomials.

The van Hoeij algorithm follows Zassenhaus' [Zass] approach by factoring f mod a prime number and Hensel Lifting the local factors. The practical speed-up in van Hoeij's algorithm comes from using the LLL [LLL] algorithm to solve the exponential recombination problem of decicing which combination of local factors form the true factors. However, the cost of LLL in van Hoeij's approach has been difficult to bound (in fact [van Hoeij] only proves termination and makes no attempt at finding a complexity).

Belabas found a fine-tuning [Belabas] of van Hoeij's algorithm which nearly optimizes the practical running times, but still does not provide a good bound for the LLL costs. In [BHKS] both variants were shown to have polynomial complexity, but these bounds are still unsatisfactorily large and do little to illuminate the behavior of these algorithms. Our algorithm improves Belabas' approach in the following ways:

We make a practical improvement which ensures that Hensel Lifting is always minimized.

We include a decision making process which allows us to bound the total number of LLL switches in the algorithm by O(
r
3
), where
r
is the number of local factors. This is independent of both degree and coefficient size of
f
.

.

In this poster we present an overview of the new algorithm and give a brief look at the style of our proofs. For the full details of the switch bound O(
r
3
) see [Novocin]. Using the Floating-Point LLL [L2] and some minor changes we can show the LLL costs are O(
r
7
). We are still writing down the details of a proof that the new total complexity of our algorithm is O(
r
7
).
Spin Accumulation in a Quantum Wire with Rashba Spin-Orbit Coupling
Authors: Fu Xi , Liao Wenhu , Zhou Guanghui
Published: February 2009

We investigate theoretically the spin accumulation in a Rashba spin-orbit coupling quantum wire. Using the scattering matrix approach within the effective free-electron approximation, we have demonstrated the three components of spin polarization. It is found that by a few numerical examples, the two peaks for the out-of-plane spin accumulation〈Sz〉shift to the edges of quantum wire with the increase of propagation modes. The period of intrinsic oscillations〈Sx/y〉inversely proportions to the Rashba SOC strength. This effect may be used to differentiate the intrinsic spin accumulation from the extrinsic one.
Strong Convergence Theorem for Two Commutative Asymptotically Nonexpansive Mappings in Hilbert Space
Authors: Liu Jianjun , He Lili , Deng Lei
Published: February 2009

C is a bounded closed convex subset of a Hilbert space H, T and S : C → C are two asymptotically nonexpansive mappings such that ST = TS. We establish a strong convergence theorem for S and T in Hilbert space by hybrid method. The results generalize and unify many corresponding results.
Design of Short, High‐Rate DVB‐S2‐Like Semi‐Regular LDPC Codes
Authors: Barletta Luca , Spalvieri Arnaldo
Published: February 2009

This work focuses on high‐rate (R > 4/5) moderate‐length (1000 ≤ n < 5000) low‐density parity‐check codes. High‐rate codes allow to maintain good quality of the preliminary decisions
that are used in carrier recovery, while a moderate code length
allows to keep the latency low. The interleaver of the LDPC
matrix that we consider is inspired to the DVB‐S2 standard
one. A novel approach for avoiding short cycles is analyzed. A
modified BP decoding algorithm is applied in order to deal with
longer cycles. Simulations and results for the AWGN channel are
presented, both for BPSK signalling and for coded modulation
based on the partition ℤ2/4ℤ2.
An Evaluation of Dynamic Partial Reconfiguration for Signal and Image Processing in Professional Electronics Applications
Authors: Manet Philippe , Maufroid Daniel , Tosi Leonardo , Gailliard Gregory , Mulertt Olivier , Di Ciano Marco , Legat Jean-Didier , Aulagnier Denis , Gamrat Christian , Liberati Raffaele , La Barba Vincenzo , Cuvelier Pol , Rousseau Bertrand , Gelineau Paul
Published: February 2009

Signal and image processing applications require a lot of computing resources. For low-volume applications like in professional electronics applications, FPGA are used in combination with DSP and GPP in order to reach the performances required by the product roadmaps. Nevertheless, FPGA designs are static, which raises a flexibility issue with new complex or software defined applications like software-defined radio (SDR). In this scope, dynamic partial reconfiguration (DPR) is used to bring a virtualization layer upon the static hardware of FPGA. During the last decade, DPR has been widely studied in academia. Nevertheless, there are very few real applications using it, and therefore, there is a lack of feedback providing relevant issues to address in order to improve its applicability. This paper evaluates the interest and limitations when using DPR in professional electronics applications and provides guidelines to improve its applicability. It makes a fair evaluation based on experiments made on a set of signal and image processing applications. It identifies the missing elements of the design flow to use DPR in professional electronics applications. Finally, it introduces a fast reconfiguration manager providing an 84-time improvement compared to the vendor solution.
Coincidence Point, Best Approximation, and Best Proximity Theorems for Condensing Set-Valued Maps in Hyperconvex Metric Spaces
Authors: Amini-Harandi A. , Farajzadeh A. P. , O'Regan D. , Agarwal R. P.
Published: February 2009

In hyperconvex metric spaces, we first present a coincidence point theorem for condensing set-valued self-maps. Then we consider the best approximation problem and the best proximity problem for set-valued mappings that are condensing. As an application, we derive a coincidence point theorem for nonself-condensing set-valued maps.
An Effective On-line Polymer Characterization Technique by Using SALS Image Processing Software and Wavelet Analysis
Authors: Xian Guang-ming , Qu Jin-ping , Zeng Bi-qing
Published: February 2009

This paper describes an effective on-line polymer characterization technique by using small-angle light-scattering (SALS) image processing software and wavelet analysis. The phenomenon of small-angle light scattering has been applied to give information about transparent structures on morphology. Real-time visualization of various scattered light image and light intensity matrices is performed by the optical image real-time processing software for SALS. The software can measure the signal intensity of light scattering images, draw the frequency-intensity curves and the amplitude-intensity curves to indicate the variation of the intensity of scattered light in different processing conditions, and estimate the parameters. The current study utilizes a one-dimensional wavelet to delete noise from the original SALS signal and estimate the variation trend of maximum intensity area of the scattered light. So, the system brought the qualitative analysis of the structural information of transparent film success.
ASolanum lycopersicum×Solanum pimpinellifoliumLinkage Map of Tomato Displaying Genomic Locations of R-Genes, RGAs, and Candidate Resistance/Defense-Response ESTs
Authors: Sharma Arun , Zhang Liping , Niño-Liu David , Ashrafi Hamid , Foolad Majid R.
Published: February 2009

We have identified an accession (LA2093) within the tomato wild species Solanum pimpinellifolium with many desirable characteristics, including biotic and abiotic stress tolerance and good fruit quality. To utilize the full genetic potential of LA2093 in tomato breeding, we have developed a linkage map based on anF2population of a cross between LA2093 and a tomato breeding line, using 115 RFLP, 94 EST, and 41 RGA markers. The map spanned 1002.4 cM of the 12 tomato chromosomes with an average marker distance of 4.0 cM. The length of the map and linear order of the markers were in good agreement with the published maps of tomato. The ESTs were chosen based on their sequence similarities with known resistance or defense-response genes, signal-transduction factors, transcriptional regulators, and genes encoding pathogenesis-related proteins. Locations of several ESTs and RGAs coincided with locations of several known tomato resistance genes and quantitative resistance loci (QRLs), suggesting that candidate-gene approach may be effective in identifying and mapping new R genes. This map will be useful for marker-assisted exploitation of desirable traits in LA2093 and otherS. pimpinellifoliumaccessions, and possibly for utilization of genetic variation withinS. lycopersicum.
Low-Molecular-Weight Heparin Use in a Case of Noncardiogenic Multifocal Perinatal Thromboembolic Stroke
Authors: Saxonhouse Matthew A. , Tarquinio Dan , Carney Paul R. , Bennett Jeff , Smith Amy , Hunger Stephen P. , Geyer James D.
Published: February 2009

A full-term neonate suffered multifocal cerebral infarctions due to multiple large vessel thrombi. Thrombophilia and cardiovascular assessments were negative, but due to the severity of the lesions and the concern for expansion of the thrombi or future embolic events, treatment with low-molecular-weight heparin (LMWH) was initiated. No complications from treatment were experienced. We present this severe case in order to highlight difficult management decisions for newborns with multifocal perinatal thromboembolic stroke and to stress the need for further practice guidelines and research in this area.
Isolated Fetal Ascites Secondary to Persistent Urogenital Sinus
Authors: Camanni D. , Zaccara A. , Capitanucci M. L. , Mosiello G. , Capolupo I. , Iacobelli B. D. , De Gennaro M.
Published: February 2009

Objective. To present a case of isolated ascites secondary due to urogenital abnormalities (urogenital sinus) without any other prenatal ultrasound marker.Method. A 36-year-old woman with prenatal isolated ascites delivered a female baby, weighing 2.285 g; ascites was drained at birth and the baby underwent several episodes of urinary retention prior to undergoing X-ray investigations.Results. A voiding cystourethrogram revealed a short urogenital sinus: a vesicostomy was performed. A vaginoscopy revealed double vagina with a large posterior vagina. A posterior sagittal anorectal pull-through with genitoplasty was performed at 2 years old with 1-year follow-up.Conclusions. Though rare, a urogenital abnormality is to be suspected in fetal ascites cases with negative viral tests and no cardiac anomalies. The most common ultrasound marker of such abnormalities (fluid filled cavity) may be missing because of complete drainage of urine through the tubes into peritoneum.
Selective Depolymerization and Effects of Homolysis of Poly(L-lactic acid) in a Blend with Polypropylene
Authors: Nishida Haruo , Arazoe Yoshiro , Tsukegi Takayuki , Yan Wang , Shirai Yoshihito
Published: February 2009

Blends of poly(L-lactic acid) (PLLA) and polypropylene (PP), which are candidates for the practical use of PLLA, were investigated for selective degradation of PLLA, resulting in quantitative conversion of PLLA components into cyclic monomers, lactides, using magnesium oxide (MgO) as a depolymerization catalyst. Obviously, the catalyst MgO selectively accelerated only the PLLA depolymerization in the blends, dominantly generating L,L-lactide as a volatile product and separating the PP component. Expected effects of homolysis in the blend system were also determined as slight changes in activation energy of degradation for both the components and through the suppression of degradation by an antioxidant.
An Unusual Presentation of Vertigo: Is Head Titubation the Key to Diagnosis?
Authors: Judd O. , Medcalf M.
Published: February 2009

Objective. Discuss complex interplay of pathophysiological effects of cerebellar space occupying lesions on the vestibular pathway. Discuss challenges of diagnosis and referral along with differential and final diagnosis of unusual presentation.Case Report. We describe the case of a patient with vertiginous symptoms complicated by neurological features, namely, head titubation and tremor. The patient also had signs of oscillopsia and possible impairment of the vestibulo-ocular reflex. The resulting symptom and sign complex made for a difficult diagnosis, as the interplay of the pathophysiology of these signs, were unusual.Conclusion. The discussion has revealed that the cerebellar lesions themselves may have simultaneously caused head tremor and an inability for the vestibulo-ocular reflex to compensate, resulting in vertigo. However, whether the vertigo was a result of an oscillopsia, nystagmus, or central cause, the referral route should initially be via a general physician to rule out such a life threatening cause as a tumour.
Synthesis and TDDFT Investigation of New Maleimide Derivatives Bearing Pyrrole and Indole Ring
Authors: Shigemitsu Yasuhiro , Komiya Kaori , Mizuyama Naoko , Hagimori Masayori , Tominaga Yoshinori
Published: February 2009

A novel series of heterocycles were obtained through the condensation reaction of 4-methylthiomaleimides with pyrroles and indoles. The newly synthesized compounds exhibit their major electronic absorption peaks ranging 435–504 nm in solution at room temperature. Time-dependent
density-functional theory (TDDFT) calculations were systematically performed in order to elucidate their structure-color relationships, using a set of exchange-correlation (XC) functionals. The TDDFT computational scheme employing PCM-TDDFT/6-31+G(d,p)//DFT/6-311G(d,p) level of theory gave qualitatively satisfactory results in their predictions.
An Extension to the Owa‐Srivastava Fractional Operator with Applications to Parabolic Starlike and Uniformly Convex Functions
Authors: Al-Refai Oqlah , Darus Maslina
Published: February 2009

Let 𝒜 be the class of analytic functions in the open unit disk 𝕌. We define Θα,β : 𝒜 → 𝒜 by (Θα,βf)(α, β ≠ 2, 3, 4…), where is the fractional derivative of f of order γ. If α, β ∈ [0, 1], then a function f in 𝒜 is said to be in the class SPα,β if Θα,βf is a parabolic starlike function. In this paper, several properties and characteristics of the class SPα,β are investigated. These include subordination, characterization and inclusions, growth theorems, distortion theorems, and class‐preserving operators. Furthermore, sandwich theorem related to the fractional derivative is proved.
Growth and Survival of Acid-Resistant and Non-Acid-Resistant Shiga-Toxin-ProducingEscherichia coliStrains during the Manufacture and Ripening of Camembert Cheese
Authors: Montet M. P. , Jamet E. , Ganet S. , Dizin M. , Miszczycha S. , Dunière L. , Thevenot D. , Vernozy-Rozand C.
Published: February 2009

Growth and survival of acid-resistant (AR) and non-acid-resistant (NAR) Shiga-toxin-producingEscherichia coli(STEC) strains were investigated during the manufacture and ripening of microfiltered milk Camembert cheeses. The induction of acid resistance of the STEC strains in cheeses was also studied. Six different mixtures of AR and/or NAR STEC strains were inoculated separately into microfiltered milk at a level of103CFUmL−1. The STEC counts (AR and NAR) initially increased by 1 to 2log⁡10CFUg−1during cheese-making. Thereafter, the populations stabilized during salting/drying and then decreased during the early stages of ripening. Exposing the STEC strains in artificially inoculated cheeses to simulated gastric fluid (SGF - pH: 2.0) reduced the number of NAR strains to undetectable levels within 40 minutes, versus 120 minutes for the AR STEC strains. AR and NAR STEC were able to survive during the manufacture and ripening of Camembert cheese prepared from microfiltered milk with no evidence of induced acid tolerance in NAR STEC strains.
A Duality Approach to the Genealogies of Discrete Nonneutral Wright‐Fisher Models
Authors: Huillet Thierry E.
Published: February 2009

Discrete ancestral problems arising in population genetics are investigated.
In the neutral case, the duality concept has been proved of
particular interest in the understanding of backward in time ancestral process
from the forward in time branching population dynamics. We show that
duality formulae still are of great use when considering discrete nonneutral
Wright‐Fisher models. This concerns a large class of nonneutral models with
completely monotone (CM) bias probabilities. We show that most classical
bias probabilities used in the genetics literature fall within this CM class or
are amenable to it through some “reciprocal mechanism" which we define.
Next, using elementary algebra on CM functions, some suggested novel evolutionary
mechanisms of potential interest are introduced and discussed.
A Simple Approach for Enhancing the Output Performance of Solar‐Pumped Solid‐State Lasers
Authors: Liang Dawei , Pereira Rui
Published: February 2009

A simple truncated fused silica elliptical cavity is proposed to enhance the output performance of solar‐pumped solid‐state lasers. The imaging property of the truncated elliptical cavity ensures an enhanced absorption distribution within an Nd:YAG rod. Optimum pumping parameters are found through ZEMAX nonsequential ray‐tracing and LASCAD laser cavity analyses. Compared with the output laser performance of a 3D‐compound parabolic concentrator‐2D‐compound parabolic concentrator (3D‐CPC‐2D‐CPC) cavity, the truncated cavity provides 11% more multimode and 72.7% more TEM00laser powers. A laser beam of high beam quality can be produced efficiently. The standard tracking error for multimode laser power is also reduced to only 4.0% by the truncated cavity.
Observation of Suprathermal Flux from SROSS-C2 Data at Low Latitude
Authors: Pandey Rama Shankar , Misra Krishan Datta
Published: February 2009

The studies of suprathermal flux at equatorial latitude for low solar activity year of 1996 (from January to December) are reported. The retarding potential analyzer (RPA) data of Indian space research organization Stretched Rohini Satellite Series-C2 (SROSS-C2) are used. The suprathermal electron flux data are chosen in the height range of  km. Seasional, latitudinal, and height variations of suprathermal flux having energy range above 30 eV along with comparisons in latitudinal variation of small energy superathermal flux of 5 eV are also reported. The data are selected during the period of local midnight to avoid contaminations from photoelectron flux and flux coming from coating of electrodes.