bluuebunny/crossref_metadata_2025_split huggingface dataset:
Maximum utility principle access control for beyond 3G mobile system
Authors: Xu Xiaodong , Wu Chunli , Tao Xiaofeng , Wang Ying , Zhang Ping 
Published: May 2007

AbstractWith current research focusing on beyond 3G (B3G)/4G mobile systems, many advanced techniques are investigated by world‐wide research institutes and standard organization, such as multi input multi output (MIMO), orthogonal frequency division multiplex (OFDM), and multi‐antenna distributed cellular network architecture. Based on these novel techniques, the radio resource management (RRM) strategies, such as access control, also need to be developed. This paper proposes the maximum utility principle access control (MUPAC) basing on Dijkstra's Shortest Path Algorithm for multi‐antenna cellular network architectures. In the accessing process of the proposed algorithm, the shortest path in Dijkstra's Algorithm is replaced by the cost of accessing process, which is represented by utility function. Taking Generalized Distributed Cellular Architecture—Group Cell as an example, MUPAC is described in details with the utility function, maximum utility principle, flow chart of accessing process. Performance evaluation and analyses verify the merits of MUPAC algorithm in improving system capacity, accessing success probability, and efficiency of system resources usage. Copyright © 2007 John Wiley & Sons, Ltd.
Delay/disruption tolerant mobilead hocnetworks: latest developments
Authors: Zhang Zhensheng , Zhang Qian 
Published: May 2007

AbstractThere is much research activity in the emerging area of delay/disruption tolerant networks (DTN) in the past few years. DTNs pose many new challenges, and protocols designed for wired Internet or wireless mobilead hocnetworks do not work properly in DTNs. Routing is one of the key components in DTNs and the message ferry (MF) approach has been drawn a lot of attention to support routing in DTNs. Besides the underlying routing protocols, issues in transport layer are also very important and need to be addressed for DTNs. Recently, many new routing protocols, including unicast using the MF approach, inter‐region routing and multicast, have appeared in the literature. There are also a few works addressing issues in the transport layer. This paper provides an overview on recent developments including message ferrying, multicast support, inter‐region routing, and transport layer issues. It also points out some open research issues and intends to motivate new research and development in this area. Copyright © 2007 John Wiley & Sons, Ltd.
Storage routing for DTN congestion control
Authors: Seligman Matthew , Fall Kevin , Mundur Padma 
Published: May 2007

AbstractThe Delay Tolerant Networking (DTN) architecture approaches the problem of reliable message delivery in intermittent networks using a store‐and‐forward approach where messages may remain stored for relatively long periods of time in persistent storage at DTN routers. Forwarded messages are removed from persistent storage only when transfer acknowledgment to another router or final recipient is received. Congestion in such networks takes the form of persistent storage exhaustion. Several solutions exist including slowing sources, using alternative routes, discarding traffic, or migrating messages to alternative storage locations. We propose storage routing (SR), a congestion management solution of the last form. SR employs nearby nodes with available storage to store data that would otherwise be lost given uncontrollable data sources (such as sensors). SR determines a collection of messages and neighbors to migrate them to using a set of locally scoped distributed algorithms, possibly incorporating loops that are known to be optimal for some DTN routing scenarios and decouples storage management from global DTN route selection. Simulations show up to a 500 per cent performance improvement using SR as compared with a comparable scenario lacking SR. Furthermore, we show a desirable parameter insensitivity to node storage capacity, neighborhood search radius, and message lifetime. Copyright © 2007 John Wiley & Sons, Ltd.
Berechnung des Wärmeüberganges an laminar umströmten Körpern mit konstanter und ortsveränderlicher Wandtemperatur
Authors: Dienemann W. 
Published: May 2007

AbstractFür die Berechnung des ebenen Problems der thermischen Grenzschicht an einem laminar umströmten Körper bei inkompressibler Strömung wird ein neues Näherungsverfahren angegeben, das in der rechnerischen Durchführung wesentlich bequemer ist als die bisherigen Verfahren. Außer dem Fall des geheizten Körpers mit konstanter Wandtemperatur kann damit auch der Wärmeübergang an einem Körper mit ortsveränderlicher Wandtemperatur behandelt werden. Gleichzeitig ergibt sich auch ein vereinfachtes Berechnungsverfahren für die dreidimensionale Strömungsgrenzschicht an einem schräg angeblasenen Zylinder (schiebender Tragflügel).
Elasto‐plastische Reflexion eines Stabes
Authors: Richter Hans 
Published: May 2007

AbstractEs wird der elasto‐plastische Reflexionsvorgang und der nach der Reflexion verbleibende Schwingungszustand für einen Stab endlicher Länge untersucht, der mit genügend hoher Geschwindigkeit gegen eine feste Wand stößt und dessen Material keine Verfestigung, jedoch Relaxation besitzt. Die Abhängigkeiten des Restitutionskoeffizienten und der Reflexionsdauer von Stablänge und Geschwindigkeit werden berechnet.
Zur Interpolationstheorie der reellen Funktionen
Authors: Quade W. 
Published: May 2007

AbstractNach Erörterung der beiden bekannten Defekte der Lagrange schen Interpolationsformel wird ein von diesen Defekten freies Interpolationsverfahren beschrieben. Zur Interpolation werden dabei ganze Funktionen benutzt, die sich additiv aus einem Polynom und einer endlichen trigonometrischen Summe zusammensetzen. Der Unterschied zwischen Funktion und Interpolationsausdruck wird abgeschätzt. Die sich aus diesem Verfahren ergebenden Quadraturformeln werden untersucht.
Überschallströmung um unter kleinem Anstellwinkel angeblasene Drehkörper mit anliegender Kopfwelle
Authors: Samelson Klaus 
Published: May 2007

AbstractDie strengen Differentialgleichungen der Gasdynamik werden zur Berechnung der Überschallströmung um Drehkörper mit kleinem Anstellwinkel durch Störungsrechnung auf Systeme in zwei unabhängigen Veränderlichen reduziert, die auf charakteristische Form gebracht werden. Für die Störströmung erster Ordnung werden angenäherte Randbedingungen und Übergangsbedingungen auf der Stoßfront der achsensymmetrischen Grundströmung angegeben. Aus dieser werden Bedingungen für die Bestimmung der änderung der Stoßfront gegenüber dem achsensymmetrischen Fall abgeleitet.
Über die Bildung der Koeffizienten bei der Entwicklung einer Funktion nach einem vorgeschriebenen Funktionensystem
Authors: Fuchssteiner W. 
Published: May 2007

AbstractIn einer früheren Arbeit konnte Verf. zeigen, daß die Bestimmung der Biegeflächenfunktion w einer beliebig konturierten Platte durch die Entwicklung von w nach einem Funktionensystem geschieht, das zwangsläufig jeder Kontur zugeordnet ist. Die Entwicklungskoeffizienten Können dabei einheitlich durch lineare Operatoren gewonnen werden. Wie die linearen Operatoren gestaltet sind, zeigt der Verf. nunmehr.Anwendungen auf die Systeme \documentclass{article}\pagestyle{empty}\begin{document}$ (x - a)^n,\cos nx,\prod \limits_{v = 0}^n {(x - v)} $\end{document} und auf die orthogonalen Systeme.
Verallgemeinerte Föpplsche Kurven im Zusammenhang mit der Wirbelwiderstandsbestimmung
Authors: Dolaptschiew Bl. 
Published: May 2007

AbstractDem Lösungsschema für angenäherte Wirbelwiderstandsbestimmung eines Kreiszylinders wird ein geometrisches Bild gegeben. Diesem Bild entsprechen die sogenannten „verallgemeinerten Föpplschen Kurven”︁. Es werden diejenigen von ihnen untersucht, von deren Punkten die Wirbelpaare sich so abreißen, daß sie eine symmetrische Wirbelstraße bilden, deren Breite gleich dem Zylinderdurchmesser ist. Weiter ist noch das Zirkulationsbestimmen möglich und infolgedessen die Kármánsche Widerstandsformel rein theoretisch verwendbar.
Neue Fehlerabschätzungen für verschiedene Iterationsverfahren
Authors: Schröder Johann 
Published: May 2007

AbstractAusgehend von einem an anderer Stelle1) bewiesenen Satz über das abstrakte Iterationsverfahren un+1 = Tun werden verschärfte Fehlerabschätzungen hergeleitet für Iterationsverfahren bei linearen und nichtlinearen Gleichungssystemen sowie Anfangs‐ und Randwertaufgaben für gewöhnliche Differentialgleichungen.
Berechnung von teilweise eingespannten rechteckigen Platten bei Vorgabe von Randmomenten
Authors: Wegner Udo 
Published: May 2007

AbstractEs wird ein nicht‐vollständiges, koorthogonales, komplexes System von biharmonischen Funktionen untersucht, das bei vielen der in der Überschrift genannten Aufgaben die Koeffizienten in geschlossener Form darzustellen gestattet, ähnlich der Fourier‐Darstellung. Das Verfahren wird an einigen technisch wichtigen Problemen erläutert.
Die „Neumannsche Methode”︁ zur Approximation einer durch Beobachtungen gegebenen Funktion und ihr Zusammenhang mit der mechanischen Quadratur nach Gauß‐Jacobi
Authors: Mauersberger Peter 
Published: May 2007

AbstractDie hier vorgetragene Verallgemeinerung der von F. Neumann für die Entwicklung nach Kugelfunktionen angegebene Methode löst die Aufgabe, eine durch naturwissenschaftliche Beobachtungen nur für diskrete Werte der unabhängigen Veränderlichen vorgegebene Funktion von n Variablen mittels orthogonaler Polynome im Sinne der Methode der kleinsten Quadrate zu approximieren, ohne daß eine Ausgleichungsrechnung durchgeführt werden muß. Es wird der Zusammenhang mit der mechanischen Quadratur nach Gauß‐Jacobi aufgezeigt und zur Vereinfachung der Beweisführung der „Neumann schen Methode”︁ und zu ihrer Ergänzung herangezogen.
Der Raumschlitten
Authors: Aumann Georg 
Published: May 2007

AbstractEin Raumschlitten ist ein starrer Körper, der sich so bewegt, daß in einem körperfesten Punkt die absolute Geschwindigkeit zu einer vorgegebenen körperfesten Richtung entweder stets senkrecht (I) oder stets parallel (II) ist. Es werden die Bewegungsgleichungen eines kräftefreien Raumschlittens aufgestellt, und es wird im kugelsymmetrischen Falle gezeigt, daß neben den trivialen periodischen Geschwindigkeitsabläufen im Fall (I) nur aperiodische, im Fall (II) aber auch periodische Geschwindigkeitsabläufe möglich sind.
Finite Bending of a Plate into a Spherical Shell
Authors: Seth B. R. 
Published: May 2007

AbstractBy using the theorie of finite deformation it is shown that a circular plate of radius d can be bent into a spherical shell by forces and couples applied to the edges only, the inner surface a and the outer surface b of the shell being free from tractions. The radius of the plate is assumed to be small compared with a and b so that (d/a2) can be neglected. The particular case in which the Possion's ratio σ is equal to 1/3 has been discussed in detail. The percentage of decrease in thickness and the change in the edge‐radii have been obtained.
Vibrations of a beam on elastic foundation II
Authors: Mathews P. M. 
Published: May 2007

AbstractIn an earlier paper, the equations describing the vibrations of a beam on elastic foundation under the action of an alternating force whose point of application moves along the beam was solved by the author, neglecting damping. The effect of damping is taken into account in the present work, and explicit solutions, valid for all frequencies and velocities of the applied force, are obtained. In qualitative features the most obvious difference from the undamped case is that, for non‐zero velocity, the displacements of the beam are no longer symmetric about the instantaneous position of the applied force, but are greater behind than ahead of this position.
Resistance on a sphere due to a circular vortex filament in an uniform flow of a perfect liquid
Authors: Mitra M. K. 
Published: May 2007

AbstractThis paper gives a formula for resistance (in series of Legendre functions) on a sphere due to a circular vortex filament in an uniform flow of a perfect liquid. The stream function of the motion has been found by Butler's sphere Theorem and then the resistance on the sphere is calculated by means of Bernoulli's pressure equation.
Theorie und Experiment zum Reibungswiderstand der glatten rotierenden Scheibe bei turbulenter Strömung
Authors: Broecker E. 
Published: May 2007

AbstractDer Reibungswiderstand rotierender Scheiben in Gehäusen ist theoretisch und experimentell sowohl für die Laminarströmung als auch für die laminare und turbulente Grenzschicht zwischen der Kernströmung und der rotierenden Scheibe bzw. der gegenüberliegenden Wand untersucht worden; entsprechende Ergebnisse sind für die frei rotierende Scheibe bei laminarer und turbulenter Grenzschicht bekannt.Theorie und Experiment sind für die verschiedenen Fälle in guter Übereinstimmung mit Ausnahme des Falles der Scheibe im Gehäuse bei turbulenter Grenzschichtströmung, was bisher mit den Annahmen zur Lösung der Grenzschicht‐Impulsgleichungen begründet wurde. Die folgende Untersuchung zeigt, daß das theoretische Ergebnis experimentell nicht nachweisbar ist und behandelt zwei Fälle unterschiedlicher Wandbegrenzung, die eine allmähliche bzw. schnelle Änderung des Drehmomentenbeiwertes vom unteren Grenzwert der Scheibe im engen Gehäuse zum oberen Grenzwert der freien Scheibe ergeben.
Newborn screening for cystic fibrosis: Techniques and strategies
Authors: Wilcken Bridget 
Published: May 2007

SummaryNewborn screening for cystic fibrosis has been carried out for over 25 years, and clinical and cost benefits have been documented. There is still much variation in the methods and strategies adopted. All current screening programmes use a measurement of immunoreactive trypsin as a primary screening test, and in most, a second tier test involves analysing DNA mutations. The choice of DNA mutations depends on the genetic background in the region, and considerations of cost. Using DNA analysis as part of a screening procedure has introduced unwanted carrier detection, and protocols have now been devised in an attempt to avoid this. There are at least seven distinct protocols in use, all of which have different advantages and disadvantages, and no method or strategy will suit every region. Further careful study of performance and costs of various strategies is needed.
Dexamethasone treatment differentially affects the oxidative energy metabolism of rat brain mitochondria in developing and adult animals
Authors: Pandya Jignesh D. , Agarwal Neeraj A. , Katyare Surendra S. 
Published: May 2007

AbstractWe studied the effect of repeated exposure to dexamethasone (Dex) treatment on rat brain mitochondrial oxidative energy metabolism in developing rats at different postnatal ages, i.e. 2–5 week and in adults. The animals were injected with a dose of 2 mg of Dex/kg body weight at around 7:00 a.m. for three alternative days prior to the day of sacrifice; the control group animals received saline vehicle. We measured rates of respiration with different substrates, viz. glutamate, pyruvate + malate, succinate and ascorbate + TMPD; the contents of individual cytochromes and the dehydrogenases and ATPase activities. Dex treatment, in general, stimulated the state 3 rates of respiration rates in young animals in age‐dependent and substrate‐specific manner except for the 3 week group, whereas in the adults there was substantial inhibition of the respiration. The pattern of dehydrogenases activities matched with respiration rates. Dex treatment also resulted in uncoupling of the second and third site of phosphorylation in 3‐week‐old animals and in the adults. The contents of cytochromeaa3,band ATPase activities decreased significantly after Dex treatment in all the age groups. The results thus emphasize that exposure to repeated Dex treatment can significantly influence the oxidative energy metabolism of brain mitochondria in young growing animals as well as in adults.
Transient changes in the localization and activity of ecto‐nucleotidases in rat hippocampus following lipopolysaccharide treatment
Authors: Kittel Ágnes , Sperlágh Beata , Pelletier Julie , Sévigny Jean , Kirley Terence L. 
Published: May 2007

AbstractThe concentrations of extracellularly released nucleotides are controlled by metabolism via ecto‐nucleotidases, but the precise physiological roles of the ecto‐nucleoside triphosphate diphosphohydrolases in the modulation of purinergic receptor signalling are still unclear. Bacterial endotoxin lipopolysaccharide (LPS) treatment (administered intraperitoneally, 2 mg/kg body weight) of rats resulted in no significant changes in the overall ecto‐nucleotidase activities of the hippocampus, however, LPS treatment did cause transient changes in the morphology of endothelial cells and pericytes and in the localization pattern of ecto‐ATPase activity in rat hippocampus. The transient decrease in NTPDase1 (ecto‐nucleoside triphosphate diphosphohydrolase1) activity, located on the luminal side of the endothelial cells, was balanced by increases in ecto‐nucleotidase activities in pericytes and at other sites, consistent with an unchanged overall ecto‐ATPase activity of the hippocampus.Since the transient loss of NTPDase1 activity was not accompanied by a loss of NTPDase1 protein, we hypothesize that LPS caused transient alterations in the lipid membranes, since NTPDase1 activity is known to be sensitive to changes in membrane structure via its transmembrane domains. After 2–3 days, the LPS‐induced changes in cell morphology and ecto‐nucleotidase localization disappeared. We conclude that a low dose of LPS causes transient changes in the localization pattern of ecto‐nucleotidases in endothelial cells and pericytes, which, coupled with the observed cellular morphological changes, may indicate modified cellular signalling in the hippocampus.
Down‐regulation of human RNA/DNA helicase SUV3 induces apoptosis by a caspase‐ and AIF‐dependent pathway
Authors: Szczesny Roman J. , Obriot Helene , Paczkowska Aleksandra , Jedrzejczak Robert , Dmochowska Aleksandra , Bartnik Ewa , Formstecher Pierre , Polakowska Renata , Stepien Piotr P. 
Published: May 2007

Background information. The nuclear gene hSUV3 (human SUV3) encodes an ATP‐dependent DNA/RNA helicase. In the yeast Saccharomyces cerevisiae the orthologous Suv3 protein is localized in mitochondria, and is a subunit of the degradosome complex which regulates RNA surveillance and turnover. In contrast, the functions of human SUV3 are not known to date.Results. In the present study, we show that a fraction of human SUV3 helicase is localized in the nucleus. Using small interfering RNA gene silencing in HeLa cells, we demonstrate that down‐regulation of hSUV3 results in cell cycle perturbations and in apoptosis, which is both AIF‐ and caspase‐dependent, and proceeds with the induction of p53.Conclusions. In addition to its mitochondrial localization, human SUV3 plays an important role in the nucleus and is probably involved in chromatin maintenance.
Thioredoxin-Linked Proteins Are Reduced during Germination ofMedicago truncatulaSeeds
Authors: Alkhalfioui Fatima , Renard Michelle , Vensel William H. , Wong Joshua , Tanaka Charlene K. , Hurkman William J. , Buchanan Bob B. , Montrichard Françoise 
Published: May 2007

AbstractGermination of cereals is accompanied by extensive change in the redox state of seed proteins. Proteins present in oxidized form in dry seeds are converted to the reduced state following imbibition. Thioredoxin (Trx) appears to play a role in this transition in cereals. It is not known, however, whether Trx-linked redox changes are restricted to cereals or whether they take place more broadly in germinating seeds. To gain information on this point, we have investigated a model legume, Medicago truncatula. Two complementary gel-based proteomic approaches were followed to identify Trx targets in seeds: Proteins were (1) labeled with a thiol-specific probe, monobromobimane (mBBr), following in vitro reduction by an NADP/Trx system, or (2) isolated on a mutant Trx affinity column. Altogether, 111 Trx-linked proteins were identified with few differences between axes and cotyledons. Fifty nine were new, 34 found previously in cereal or peanut seeds, and 18 in other plants or photosynthetic organisms. In parallel, the redox state of proteins assessed in germinating seeds using mBBr revealed that a substantial number of proteins that are oxidized or partly reduced in dry seeds became more reduced upon germination. The patterns were similar for proteins reduced in vivo during germination or in vitro by Trx. In contrast, glutathione and glutaredoxin were less effective as reductants in vitro. Overall, more than half of the potential targets identified with the mBBr labeling procedure were reduced during germination. The results provide evidence that Trx functions in the germination of seeds of dicotyledons as well as monocotyledons.
ABA Is an Essential Signal for Plant Resistance to Pathogens Affecting JA Biosynthesis and the Activation of Defenses inArabidopsis
Authors: Adie Bruce A.T. , Pérez-Pérez Julián , Pérez-Pérez Manuel M. , Godoy Marta , Sánchez-Serrano José-J. , Schmelz Eric A. , Solano Roberto 
Published: May 2007

AbstractAnalyses of Arabidopsis thaliana defense response to the damping-off oomycete pathogen Pythium irregulare show that resistance to P. irregulare requires a multicomponent defense strategy. Penetration represents a first layer, as indicated by the susceptibility of pen2 mutants, followed by recognition, likely mediated by ERECTA receptor-like kinases. Subsequent signaling of inducible defenses is predominantly mediated by jasmonic acid (JA), with insensitive coi1 mutants showing extreme susceptibility. In contrast with the generally accepted roles of ethylene and salicylic acid cooperating with or antagonizing, respectively, JA in the activation of defenses against necrotrophs, both are required to prevent disease progression, although much less so than JA. Meta-analysis of transcriptome profiles confirmed the predominant role of JA in activation of P. irregulare–induced defenses and uncovered abscisic acid (ABA) as an important regulator of defense gene expression. Analysis of cis-regulatory sequences also revealed an unexpected overrepresentation of ABA response elements in promoters of P. irregulare–responsive genes. Subsequent infections of ABA-related and callose-deficient mutants confirmed the importance of ABA in defense, acting partly through an undescribed mechanism. The results support a model for ABA affecting JA biosynthesis in the activation of defenses against this oomycete.
Enhancing the validity and utility of randomized clinical trials in addictions treatment research: III. Data processing and statistical analysis
Authors: Del Boca Frances K. , Darkes Jack 
Published: May 2007

ABSTRACTPurpose This is the third paper in a series that reviews strategies for optimizing the validity and utility of randomized clinical trials (RCTs) in addictions treatment research. Whereas the two previous papers focused on design and implementation, here we address issues pertaining to data processing and statistical analysis.Scope Recommendations for enhancing data quality and utility are offered in sections on data coding and entry; and data format, structure and management. We discuss the need for preliminary data analyses that examine statistical power; patterns of attrition; between‐group equivalence; and treatment integrity and discriminability. We discuss tests of treatment efficacy, as well as ancillary analyses aimed at explicating treatment processes.Conclusions Safeguards are necessary to protect data quality, and advance planning is needed to ensure that data formats are compatible with statistical objectives. In addition to treatment efficacy, statistical analyses should evaluate study internal and external validity, and investigate the change mechanisms that underlie treatment effects.