bluuebunny/crossref_metadata_2025_split huggingface dataset:
THE CHINESE MONOID
Authors: CASSAIGNE JULIEN , ESPIE MARC , KROB DANIEL , NOVELLI JEAN-CHRISTOPHE , HIVERT FLORENT 
Published: July 2002

Résumé: Cet article présente une étude combinatoire du monoïde Chinois, un monoïde ternaire proche du monoïde plaxique, fondé sur le schéma cba≡bca≡cab. Un algorithme proche de l'algorithme de Schensted nous permet de caractériser les classes d'équivalence et d'exhiber une section du monoïde. Nous énonçons également une correspondance de Robinson–Schensted pour le monoïde Chinois avant de nous intéresser au calcul du cardinal de certaines classes. Ce travail a permis de développer de nouveaux outils combinatoires. Entre autres, nous avons trouvé un plongement de chacune des classes d'équivalence dans la plus grande classe. Quant à la dernière partie de cet article, elle présente l'étude des relations de conjugaison. This paper presents a combinatorial study of the Chinese monoid, a ternary monoid related to the plactic monoid and based on the relation scheme cba≡bca≡cab. An algorithm similar to Schensted's algorithm yields a characterization of the equivalence classes and a cross-section theorem. We also establish a Robinson–Schensted correspondence for the Chinese monoid before computing the order of specific Chinese classes. For this work, we had to develop some new combinatorial tools. Among other things we discovered an embedding of every equivalence class in the largest one. Finally, the end of this paper is devoted to the study of conjugacy classes.
MoS2 AND WS2 NANOTUBES ALLOYED WITH GOLD AND SILVER
Authors: REMSKAR M. , SKRABA Z. , SANJINÉS R. , LÉVY F. 
Published: July 2002

We report on the existence of MoS 2 and WS 2 micro- and nanotubes alloyed with gold and silver. The tubes have been grown by chemical transport reaction with iodine as a transport agent. While the undoped inorganic tubes grow by spiral rolling of the molecular layers, the presence of noble metals can partially or completely remove the chirality. The molecular layers grow in the form of coaxial cylinders. The noble metal is situated inside the walls of the tubes. It influences the longitudinal terminations of the tubes and increases the wall thickness. Distortion of every second van der Waals gap reveals that staging is present. Stop of chirality in alloyed inorganic tubes appears to be strongly coupled with the expansion of VdW gaps. The existence of M x MoS 2 and M x WS 2; (M: Au, Ag) ternary compounds, which are not known in the usual plane layered structures, gives evidence that the cylindrical geometry of crystals can stabilize new compounds and changes the chemistry as well as the physical properties of the materials.
A dynamic processor allocation policy for multiprogrammed shared-memory multiprocessors
Authors: McCann Cathy , Vaswani Raj , Zahorjan John 
Published: July 2002

We propose and evaluate empirically the performance of a dynamic processor-scheduling policy for multiprogrammed shared-memory multiprocessors. The policy is dynamic in that it reallocates processors from one parallel job to another based on the currently realized parallelism of those jobs. The policy is suitable for implementation in production systems in that:
We have evaluated our scheduler and compared it to alternatives using a set of prototype implementations running on a Sequent Symmetry multiprocessor. Using a number of parallel applications with distinct qualitative behaviors, we have both evaluated the policies according to the major criterion of overall performance and examined a number of more general policy issues, including the advantage of “space sharing” over “time sharing” the processors of a multiprocessor, and the importance of cooperation between the kernel and the application in reallocating processors between jobs. We have also compared the policies according to other criteia important in real implementations, in particular, fairness and respone time to short, sequential requests. We conclude that a combination of performance and implementation considerations makes a compelling case for our dynamic scheduling policy.
A characterization of the simple failure-biasing method for simulations of highly reliable Markovian Systems
Authors: Nakayama Marvin K. 
Published: July 2002

Simple failure biasing is an importance-sampling technique used to reduce the variance of estimates of performance measures and their gradients in simulations of highly reliable Markovian systems. Although simple failure biasing yields bounded relative error for the performance measure estimate when the system is balanced, it may not provide bounded relative error when the system is unbalanced.
In this article, we provide a characterization of when the simple failure-biasing method produces estimators of a performance measure and its derivatives with bounded relative error. We derive a necessary and sufficient condition on the structure of the system for when the performance measure can be estimated with bounded relative error when using simple failure biasing.
Furthermore, a similar condition for the derivative estimators is established. One interesting aspect of the conditions is that it shows that to obtain bounded relative error, not only the most likely paths to system failure must be examined but also some secondary paths leading to failure as well. We also show by example that the necessary and sufficient conditions for a derivative estimator do not imply those for the performance measure estimator; i.e., it is possible to estimate a derivative more efficiently than the performance measure when using simple failure biasing.
AGENTS
Authors: Moreira Dilvan de Abreu , Walczowski Les T. 
Published: July 2002

The AGENTS system is a set of programs designed to generate automatically the mask-level layout of full custom CMOS, BICMOS, and bipolar leaf cells. The system is formed from four sever programs: the placer, router, database, and broker.
The placer places components in a cell, the router wires the circuits sent to it, the database stores all the information that is dependent upon the fabrication process, such as the design rules, and the Broker makes the services of the other servers available.
These servers communicate over a computer network using the TCP/IP Internet Protocol. The Placer server receives from its client the description and netlist of the circuit to be generated using EDIF (Electronic Design Interchange Format.) The output to its client is the
mask layout of the circuit, again codified in EDIF. The comcept of agents as software components which have the ability to communicate and cooperate with each other is at the heart of the AGENTS system. This concept is not only used at the higher level, for the four servers, but at a lower level as well, inside the Router and Placer servers, where small relatively simple agents work together to accomplish complex tasks. These small agents are responsible for all the reasoning carried out by the two servers, as they hold the basic inference routines and the knowledge needed by the servers. The system's philosophy is that competence should emerge out of the collective behavior of a large number of relatively simple agents. In addition and integrated to these small agents, the system uses a genetic algorithm to improve components' placement before routing.
Person-matching by electronic methods
Authors: Phillips William , Bahn Anita K. , Miyasaki Mabel 
Published: July 2002

Record linkage in the updating of files is accomplished in many establishments through the use of a preassigned number, such as payroll number, customer number, or social security number. In vital and health records, however, a unique number is generally not preassigned to an individual for purposes of reporting services received to the health department. In order to determine whether different physician reports refer to the same individual, name and other identification must be compared. This is a laborious operation which is subject to various errors because of name misspellings, changes of name upon marriage, and other problems.
We are interested in the maintenance of a psychiatric case register in Maryland, where many of the reports from over a hundred psychiatric agencies refer to the same patient. These records must be linked in order to provide unduplicated counts of individuals under care and longitudinal records of psychiatric history. An earlier paper [1] describes our general procedures for register maintenance by use of a digital computer (Honeywell 800). Here we present in more detail our initial procedures for the person-matching process in order to elicit comments and suggestions from persons who have had experience in matching.
System architectures for computer music
Authors: Gordon John W. 
Published: July 2002

Computer music is a relatively new field. While a large proportion of the public is aware of computer music in one form or another, there seems to be a need for a better understanding of its capabilities and limitations in terms of synthesis, performance, and recording hardware. This article addresses that need by surveying and discussing the architecture of existing computer music systems.
System requirements vary according to what the system will be used for. Common uses for computer music systems include composition, performance, research, home entertainment, and studio recording/mixing. This paper outlines system components with this wide diversity of possible uses in mind.
Current synthesis and analysis techniques, and the different way in which these techniques can be implemented in special-purpose hardware, are comprehensively reviewed. Design specifications are given for certain digital-to-analog (and analog-to-digital) converters, disk interfaces, system organization, control hardware and software, and numerical precision.
Several synthesis systems are described in detail, with an emphasis on theoretical developments and innovative design. Commercial synthesizers and other architectures are also briefly mentioned.
A logical design methodology for relational databases using the extended entity-relationship model
Authors: Teorey Toby J. , Yang Dongqing , Fry James P. 
Published: July 2002

A database design methodology is defined for the design of large relational databases. First, the data requirements are conceptualized using an extended entity-relationship model, with the extensions being additional semantics such as ternary relationships, optional relationships, and the generalization abstraction. The extended entity-relationship model is then decomposed according to a set of basic entity-relationship constructs, and these are transformed into candidate relations. A set of basic transformations has been developed for the three types of relations: entity relations, extended entity relations, and relationship relations. Candidate relations are further analyzed and modified to attain the highest degree of normalization desired.
The methodology produces database designs that are not only accurate representations of reality, but flexible enough to accommodate future processing requirements. It also reduces the number of data dependencies that must be analyzed, using the extended ER model conceptualization, and maintains data integrity through normalization. This approach can be implemented manually or in a simple software package as long as a "good" solution is acceptable and absolute optimality is not required.
RECOGNITION BY γ/δ T CELLS
Authors: Chien Yueh-hsiu , Jores Rita , Crowley Michael P. 
Published: July 2002

▪ Abstract  In contrast with the study of αβ T cells, that of γδ T cells is relatively recent and stems from the discovery of their rearranged genes, rather than from any knowledge of their biological function. Thus, experiments designed to characterize their specificity and function have drawn heavily on our knowledge of αβ T cells. During the past few years, many studies, especially with mice lacking either αβ or γδ T cells, have demonstrated that γδ T cells can contribute to immune competence, but they do so in a way that is distinct from αβ T cells. It is also evident that γδ T cells may not recognize antigen the same way as do αβ T cells. Analysis of three protein antigens—the murine MHC class II IEk, the nonclassical MHC T10/T22, and the Herpes virus glycoprotein gI—indicates that γδ T cell recognition does not require antigen processing and that the proteins are recognized directly. In all three cases, recognition by these T cell clones involves neither peptides bound to these proteins nor peptides derived from them. Moreover, a group of small phosphate-containing nonpeptide compounds derived from mycobacterial extracts has been found to stimulate a major population of human peripheral γδ T cells in a T cell receptor (TCR)-dependent manner. This indicates that γδ T cells can respond to ligands that are different from those of α β T cells.Analysis of complementarity determining region (CDR3) length distributions of γ and δ chains indicates that they are more similar to those of immunoglobulins than to TCR α and β. This further supports the idea that γδ and αβ T cells recognize antigens differently and suggests that γδ T cells may be more like immunoglobulins in their recognition properties. γδ T cells share many cell surface proteins with αβ T cells and are able to secrete lymphokines and express cytolytic activities in response to antigenic stimulation. These, together with the results cited above, indicate that γδ T cells can mediate cellular immune functions without a requirement for antigen processing. Thus, pathogens, damaged tissues, or even B and T cells can be recognized directly, and cellular immune responses can be initiated without a requirement for antigen degradation or specialized antigen-presenting cells. This would give γδ T cells greater flexibility than the more classical type of αβ T cell–mediated cellular immunity.
Cellular Interactions in Thymocyte Development
Authors: Anderson Graham , Moore Nel C. , Owen John J. T. , Jenkinson Eric J. 
Published: July 2002

Interactions between stromal cells and thymocytes play a crucial role in T cell development. The thymic stroma is complex and consists of epithelial cells derived from the pharyngeal region during development, together with macrophages and dendritic cells of bone marrow origin. In addition, fibroblasts and matrix molecules permeate the whole framework. It is now apparent that these individual stromal components play specialized roles at different stages of T cell differentiation. Thus, at the early CD4−8−stage of development, T cell precursors require fibroblast as well as epithelial cell interactions. Later, at the CD4+8+stage, as well as providing low avidity TCR/MHC-peptide interactions, thymic epithelial cells have been shown to possess unique properties essential for positive selection. Dendritic cells, on the other hand, are probably efficient mediators of negative selection, but they may not be solely responsible for this activity.Alongside the functional roles of stromal cells, considerable progress is being made in unraveling the nature of the signaling pathways involved in T cell development. Identification of the pre-T cell receptor (pre-TCR) and associated signaling molecules marks an important advance in understanding the mechanisms that control gene rearrangement and allelic exclusion. In addition, a better understanding of the signaling pathways that lead to positive selection on the one hand and negative selection on the other is beginning to emerge.Many issues remain unresolved, and some are discussed in this review. What, for example, is the nature of the chemotactic factor(s) that attract stem cells to the thymus? What is the molecular basis of the essential interactions between early thymocytes and fibroblasts, and early thymocytes and epithelial cells? What is special about cortical epithelial cells in supporting positive selection? These and other issues are ripe for analysis and can now be approached using a combination of modern molecular and cellular techniques.
13C NMR of Intermediary Metabolism: Implications for Systemic Physiology
Authors: Shulman Robert G , Rothman Douglas L 
Published: July 2002

▪ Abstract  The study of intermediary metabolism in biomolecules has been given new directions by recent experiments in human muscle and brain by 13C NMR. Labeled substrates, generally glucose, have enabled the fluxes to be determined in vivo, whereas the naturally abundant 13C has enabled concentrations to be measured. In muscle the glycogen synthesis pathway has been measured and the flux control determined by metabolic control analysis of data, which shows that this pathway is mainly responsible for insulin-stimulated glucose disposal and that a deficiency in the glucose transporter in the pathway is responsible for hyperglycemia in non-insulin-dependent diabetics. From a physiological point of view the most surprising result was that the heavily regulated allosteric enzyme, glycogen synthase, does not control flux but is needed to maintain homeostasis during flux changes. This novel role for a phosphorylated allosteric enzyme is proposed to be a general phenomenon in metabolic and signaling pathways, which physiologically link different cellular activities. In human and rat brains 13C NMR measurements of the flow of labeled glucose into glutamate and glutamine simultaneously determine the rate of glucose oxidation and glutamate neurotransmitter cycling and reveal a 1:1 stoichiometry between the two fluxes. Implications for the interpretation of functional imaging studies and for psychology are discussed. These results demonstrate how intermediary metabolism serves to connect biochemistry with systemic physiology when measured and analyzed by in vivo NMR methods.
Order Information in Working Memory: fMRI Evidence for Parietal and Prefrontal Mechanisms
Authors: Marshuetz Christy , Smith Edward E. , Jonides John , DeGutis Joseph , Chenevert Thomas L. 
Published: July 2002

Abstract
Working memory is thought to include a mechanism that allows for the coding of order information. One question of interest is how order information is coded, and how that code is neurally implemented. Here we report both behavioral and fMRI findings from an experiment that involved comparing two tasks, an item-memory task and an order-memory task. In each case, five letters were presented for storage, followed after a brief interval by a set of probe letters. In the case of the item-memory task, the two letters were identical, and the subject responded to the question, “Was this letter one of the items you saw?”. In the case of the order-memory task, the letters were different, and subjects responded to the question, “Are these two letters in the order in which you saw them?”. Behaviorally, items that were further apart in the sequence elicited faster reaction times and higher accuracy in the Order task. Areas that were significantly more activated in the Order condition included the parietal and prefrontal cortex. Parietal activations overlapped those involved in number processing, leading to the suggestion that the underlying representation of order and numbers may share a common process, coding for magnitude.
Transient Activity in the Human Calcarine Cortex During Visual-Mental Imagery: An Event-Related fMRI Study
Authors: Klein Isabelle , Paradis Anne-Lise , Poline Jean-Baptiste , Kosslyn Stephen M. , Le Bihan Denis 
Published: July 2002

Abstract
Although it is largely accepted that visual-mental imagery and perception draw on many of the same neural structures, the existence and nature of neural processing in the primary visual cortex (or area V1) during visual imagery remains controversial. We tested two general hypotheses: The first was that V1 is activated only when images with many details are formed and used, and the second was that V1 is activated whenever images are formed, even if they are not necessarily used to perform a task. We used event-related functional magnetic resonance imaging (ER-fMRI) to detect and characterize the activity in the calcarine sulcus (which contains the primary visual cortex) during single instances of mental imagery. The results revealed reproducible transient activity in this area whenever participants generated or evaluated a mental image. This transient activity was strongly enhanced when participants evaluated characteristics of objects, whether or not details actually needed to be extracted from the image to perform the task. These results show that visual imagery processing commonly involves the earliest stages of the visual system.
A Cortical Mechanism for Binding in Visual Working Memory
Authors: Raffone Antonino , Wolters Gezinus 
Published: July 2002

Abstract
Luck and Vogel (1997) showed that the storage capacity of visual working memory is about four objects and that this capacity does not depend on the number of features making up the objects. Thus, visual working memory seems to process integrated objects rather than individual features, just as verbal working memory handles higher-order “chunks” instead of individual features or letters. In this article, we present a model based on synchronization and desynchronization of reverberatory neural assemblies, which can parsimoniously account for both the limited capacity of visual working memory, and for the temporary binding of multiple assemblies into a single pattern. A critical capacity of about three to four independent patterns showed up in our simulations, consistent with the results of Luck and Vogel. The same desynchronizing mechanism optimizing phase segregation between assemblies coding for separate features or multifeature objects poses a limit to the number of oscillatory reverberations. We show how retention of multiple features as visual chunks (feature conjunctions or objects) in terms of synchronized reverberatory assemblies may be achieved with and without long-term memory guidance.
Brain Potentials Reflect Behavioral Differences in True and False Recognition
Authors: Curran Tim , Schacter Daniel L. , Johnson Marcia K. , Spinks Ruth 
Published: July 2002

Abstract
People often falsely recognize nonstudied lures that are semantically similar to previously studied words. Behavioral research suggests that such false recognition is based on high semantic overlap between studied items and lures that yield a feeling of familiarity, whereas true recognition is more often associated with the recollection of details. Despite this behavioral evidence for differences between true and false recognition, research measuring brain activity (PET, fMRI, ERP) has not clearly differentiated corresponding differences in brain activity. A median split was used to separate subjects into Good and Poor performers based on their discrimination of studied targets from similar lures. Only Good performers showed late (1000-1500 msec), right frontal event-related brain potentials (ERPs) that were more positive for targets and lures compared with new items. The right frontal differences are interpreted as reflecting postretrieval evaluation processes that were more likely to be engaged by Good than Poor performers. Both Good and Poor performers showed a parietal ERP old/new effect (400-800 msec), but only Poor performers showed a parietal old/lure difference. These results are consistent with the view that the parietal and frontal ERP old/new effects reflect dissociable processes related to recollection.