bluuebunny/crossref_metadata_2025_split huggingface dataset:
GEDANKEN—a simple typeless language based on the principle of completeness and the reference concept
Authors: Reynolds John C. 
Published: July 2002

GEDANKEN is an experimental programming language with the following characteristics. (1) Any value which is permitted in some context of the language is permissible in any other meaningful context. In particular, functions and labels are permissible results of functions and values of variables. (2) Assignment and indirect addressing are formalized by introducing values, called references, which in turn possess other values. The assignment operation always affects the relation between some reference and its value. (3) All compound data structures are treated as functions. (4) Type declarations are not permitted.
The functional approach to data structures and the use of references insure that any process which accepts some data structure will accept any logically equivalent structure, regardless of its internal representation. More generally, any data structure may be implicit; i.e. it may be specified by giving an arbitrary algorithm for computing or accessing its components. The existence of label variables permits the construction of co-routines, quasi-parallel processes, and other unorthodox control mechanisms.
A variety of programming examples illustrates the generality of the language. Limitations and possible extensions are discussed briefly.
A mean value performance model for locking in databases
Authors: Tay Y. C. , Suri Rajan , Goodman Nathan 
Published: July 2002

A new performance model for dynamic locking is proposed. It is based on a flow diagram and uses only the steady state average values of the variables. It is general enough to handle nonuniform access, shared locks, static locking, multiple transaction classes, and transactions of indeterminate length. The analysis is restricted to the case in which all conflicts are resolved by restarts. It has been shown elsewhere that, under certain conditions, this pure restart policy is as good as, if not better than, a policy that uses both blocking and restarts.
The analysis is straightforward, and the computational complexity of the solution, given some nonrestrictive approximations, does not depend on the input parameters. The solution is also well defined and well behaved. The model's predictions agree well with simulation results.
The model shows that data contention can cause the throughput to thrash, and gives a limit on the workload that will prevent this. It also shows that systems with a particular kind of nonuniform access and systems in which transactions share locks are equivalent to systems in which there is uniform access and only exclusive locking. Static locking has higher throughput, but longer response time, than dynamic locking. Replacing updates by queries in a multiprogramming mix may degrade performance if the queries are longer than the updates.
Explanation-based learning: a survey of programs and perspectives
Authors: Ellman Thomas 
Published: July 2002

Explanation-based learning (EBL) is a technique by which an intelligent system can learn by observing examples. EBL systems are characterized by the ability to create justified generalizations from single training instances. They are also distinguished by their reliance on background knowledge of the domain under study. Although EBL is usually viewed as a method for performing generalization, it can be viewed in other ways as well. In particular, EBL can be seen as a method that performs four different learning tasks: generalization, chunking, operationalization, and analogy.
This paper provides a general introduction to the field of explanation-based learning. Considerable emphasis is placed on showing how EBL combines the four learning tasks mentioned above. The paper begins with a presentation of an intuitive example of the EBL technique. Subsequently EBL is placed in its historical context and the relation between EBL and other areas of machine learning is described. The major part of this paper is a survey of selected EBL programs, which have been chosen to show how EBL manifests each of the four learning tasks. Attempts to formalize the EBL technique are also briefly discussed. The paper concludes with a discussion of the limitations of EBL and the major open questions in the field.
How to write parallel programs: a guide to the perplexed
Authors: Carriero Nicholas , Gelernter David 
Published: July 2002

We present a framework for parallel programming, based on three conceptual classes for understanding parallelism and three programming paradigms for implementing parallel programs. The conceptual classes are result parallelism, which centers on parallel computation of all elements in a data structure; agenda parallelism, which specifies an agenda of tasks for parallel execution; and specialist parallelism, in which specialist agents solve problems cooperatively. The programming paradigms center on live data structures that transform themselves into result data structures; distributed data structures that are accessible to many processes simultaneously; and message passing, in which all data objects are encapsulated within explicitly communicating processes. There is a rough correspondence between the conceptual classes and the programming methods, as we discuss. We begin by outlining the basic conceptual classes and programming paradigms, and by sketching an example solution under each of the three paradigms. The final section develops a simple example in greater detail, presenting and explaining code and discussing its performance on two commercial parallel computers, an 18-node shared-memory multiprocessor, and a 64-node distributed-memory hypercube. The middle section bridges the gap between the abstract and the practical by giving an overview of how the basic paradigms are implemented.
We focus on the paradigms, not on machine architecture or programming languages: The programming methods we discuss are useful on many kinds of parallel machine, and each can be expressed in several different parallel programming languages. Our programming discussion and the examples use the parallel language C-Linda for several reasons: The main paradigms are all simple to express in Linda; efficient Linda implementations exist on a wide variety of parallel machines; and a wide variety of parallel programs have been written in Linda.
FROM GABAA RECEPTOR DIVERSITY EMERGES A UNIFIED VISION OF GABAergic INHIBITION
Authors: Costa E. 
Published: July 2002

▪ Abstract  Transmitter receptor diversity often indicates differences in transmitter receptor transduction mechanisms. This is not the case for γ-aminobutyric acid subtype A (GABAA) receptor subtypes despite the presence of 16 genes to encode the 5 families of native GABAA receptor subtypes. Similar considerations apply to GABAC receptors and GABAB receptors. Both GABAA and GABAB receptors cause hyperpolarization of neuronal membranes and inhibition of neuronal excitability, but their mechanisms differ. GABAB receptors involve an efflux of K+ rather than an influx of Cl−, as in the case of GABAA and GABAC receptors. The stimulation of GABAA receptors can sometimes cause depolarization by Cl− efflux; this efflux is not the result of a transduction mechanism modification, but of Cl−-concentration gradient modification. Presumably, GABAA receptor diversity is directly linked to the inhibitory activity of basket cells and other interneuron axons, each innervating several postsynaptic neurons (cortical and hippocampal pyramidal cells for instance). Since the role of this inhibition is to entrain hippocampal and cortical pyramidal neurons into columnary activity, the GABAA receptor diversification may be a mechanism expressed by these postsynaptic neuron populations that uses different GABA potencies to synchronize pyramidal neurons into columnary activity. Thus, GABA potency variability, which emerges from GABAA receptor diversity, plays a unifying role in the intrinsic functional mechanism of laminated structures. GABAA receptor structural differences also play a role in diazepam tolerance, which is a mechanism operative in neuronal circuit adaptation to the extreme amplification of GABA-gated Cl− current intensities. Partial agonists (such as imidazenil), which modestly amplify GABA action at many GABAA receptor subtypes, fail to cause tolerance, dependence, ataxia, or ethanol and barbiturate potentiation. Partial agonists might become a new class of anxiolytic and anticonvulsant drugs that are virtually devoid of the side effects that cause serious concerns in the clinical use of full allosteric positive modulators of GABA action, such as diazepam, alprazolam, triazolam, and others. None of the above can be used as anticonvulsants because of an extremely high tolerance liability. When there is tolerance to diazepam, signs of sensitization to proconvulsive action are exhibited simultaneously. After tolerance, associated changes in GABAA recepter subtype expression are virtually reversed in 72 h. Also, 96 h after termination of long-term diazepam treatment, rats exhibit anxiety and are more sensitive to kainic acid–elicited convulsions. At the same time, these rats have an increase in brain expression of GLuR1, R2, and R3. It is believed that the supersensitivity to kainic acid, convulsions and anxiety, and the increased expression of GLuR1, R2, and R3 may be parts of the mechanism of diazepam dependence.
Confidence in Recognition Memory for Words: Dissociating Right Prefrontal Roles in Episodic Retrieval
Authors: Henson R. N. A. , Rugg M. D. , Shallice T. , Dolan R. J. 
Published: July 2002

Abstract
We used event-related functional magnetic resonance imaging (efMRI) to investigate brain regions showing differential responses as a function of confidence in an episodic word recognition task. Twelve healthy volunteers indicated whether their old-new judgments were made with high or low confidence. Hemodynamic responses associated with each judgment were modeled with an “early” and a “late” response function. As predicted by the monitoring hypothesis generated from a previous recognition study [Henson, R. N. A., Rugg, M. D., Shallice, T., Josephs, O., & Dolan, R. J. (1999a). Recollection and familiarity in recognition memory: An event-related fMRI study. Journal of Neuroscience, 19, 3962-3972], a right dorsolateral prefrontal region showed a greater response to correct low-versus correct high-confidence judgements. Several regions, including the precuneus, posterior cingulate, and left lateral parietal cortex, showed greater responses to correct old than correct new judgements. The anterior left and right prefrontal regions also showed an old-new difference, but for these regions the difference emerged relatively later in time. These results further support the proposal that different subregions of the prefrontal cortex subserve different functions during episodic retrieval. These functions are discussed in relation to a monitoring process, which operates when familiarity levels are close to response criterion and is associated with nonconfident judgements, and a recollective process, which is associated with the confident recognition of old words.
The Effect of Divided Attention on Encoding and Retrieval in Episodic Memory Revealed by Positron Emission Tomography
Authors: Iidaka Tetsuya , Anderson Nicole D. , Kapur Shitij , Cabez Roberto , Craik Fergus I. M. 
Published: July 2002

Abstract
The effects of divided attention (DA) on episodic memory encoding and retrieval were investigated in 12 normal young subjects by positron emission tomography (PET). Cerebral blood flow was measured while subjects were concurrently performing a memory task (encoding and retrieval of visually presented word pairs) and an auditory tone-discrimination task. The PET data were analyzed using multivariate Partial Least Squares (PLS), and the results revealed three sets of neural correlates related to specific task contrasts. Brain activity, relatively greater under conditions of full attention (FA) than DA, was identified in the occipital-temporal, medial, and ventral-frontal areas, whereas areas showing relatively more activity under DA than FA were found in the cerebellum, temporo-parietal, left anterior-cingulate gyrus, and bilateral dorsolateral-prefrontal areas. Regions more active during encoding than during retrieval were located in the hippocampus, temporal and the prefrontal cortex of the left hemisphere, and regions more active during retrieval than during encoding included areas in the medial and right-prefrontal cortex, basal ganglia, thalamus, and cuneus. DA at encoding was associated with specific decreases in rCBF in the left-prefrontal areas, whereas DA at retrieval was associated with decreased rCBF in a relatively small region in the right-prefrontal cortex. These different patterns of activity are related to the behavioral results, which showed a substantial decrease in memory performance when the DA task was performed at encoding, but no change in memory levels when the DA task was performed at retrieval.
Interactions Between Forms of Memory: When Priming Hinders New Episodic Learning
Authors: Wagner Anthony D. , Maril Anat , Schacter Daniel L. 
Published: July 2002

Abstract
Human memory consists of multiple forms, including priming and explicit memory. Although considerable evidence indicates that priming and explicit memory are functionally and neuroanatomically distinct, little is know about when and how these different forms of memory interact. Here, behavioral and functional magnetic resonance imaging (fMRI) methods were used to examine a novel and counterintuitive hypothesis: Priming during episodic encoding may be negatively associated with subsequent explicit memory. Using an experimental design that exploited known properties of spacing or lag effects, the magnitudes of behavioral and neural priming during a second study episode were varied and the relation between these magnitudes of priming during re-encoding and performance on a subsequent explicit memory test was examined. Results revealed that greater behavioral priming (reduced reaction times) and neural priming (reduced left inferior prefrontal brain activation) during re-encoding were associated with lower levels of subsequent explicit memory. Moreover, those subjects who demonstrated greater behavioral and neural priming effects during re-encoding following a long lag tended to demonstrate the least benefit in subsequent explicit memory due to this second study episode. These findings suggest that priming for past experiences can hinder new episodic encoding.
The Neural Substrate of Orientation Working Memory
Authors: Cornette L. , Dupont P. , Salmon E. , Orban Guy A. 
Published: July 2002

Abstract
We have used positron emission tomography (PET) to identify the neural substrate of two major cognitive components of working memory (WM), maintenance and manipulation of a single elementary visual attribute, i.e., the orientation of a grating presented in central vision. This approach allowed us to equate difficulty across tasks and prevented subjects from using verbal strategies or vestibular cues. Maintenance of orientations involved a distributed fronto-parietal network, that is, left and right lateral superior frontal sulcus (SFSl), bilateral ventrolateral prefrontal cortex (VLPFC), bilateral precuneus, and right superior parietal lobe (SPL). A more medial superior frontal sulcus region (SFSm) was identified as being instrumental in the manipulative operation of updating orientations retained in the WM. Functional connectivity analysis revealed that orientation WM relies on a coordinated interaction between frontal and parietal regions. In general, the current findings confirm the distinction between maintenance and manipulative processes, highlight the functional heterogeneity in the prefrontal cortex (PFC), and suggest a more dynamic view of WM as a process requiring the coordinated interaction of anatomically distinct brain areas.
Brain Areas Specific for Attentional Load in a Motion-Tracking Task
Authors: Jovicich Jorge , Peters Robert J. , Koch Christof , Braun Jochen , Chang Linda , Ernst Thomas 
Published: July 2002

Abstract
Although visual attention is known to modulate brain activity in the posterior parietal, prefrontal, and visual sensory areas, the unique roles of these areas in the control of attentional resources have remained unclear. Here, we report a dissociation in the response profiles of these areas. In a parametric functional magnetic resonance imaging (fMRI) study, subjects performed a covert motion-tracking task, in which we manipulated “attentional load” by varying the number of tracked balls. While strong effects of attention—independent of attentional load—were widespread, robust linear increases of brain activity with number of balls tracked were seen primarily in the posterior parietal areas, including the intraparietal sulcus (IPS) and superior parietal lobule (SPL). Thus, variations in attentional load revealed different response profiles in sensory areas as compared to control areas. Our results suggest a general role for posterior parietal areas in the deployment of visual attentional resources.
Short-and Long-Delay Intracranial ERP Repetition Effects Dissociate Memory Systems in the Human Brain
Authors: Guillem François , Rougier Alain , Claverie Bernard 
Published: July 2002

Abstract
Prior exposure to a stimulus can facilitate the performance to subsequent presentations of that stimulus. ERP studies have shown that this facilitation is associated with the modulation of two components (N400 and P600). Investigation of the time course of both behavioral and ERP repetition effects have led to the assumption that it is subserved by the combination of at least two mechanisms operating at different time-points: a short-delay semantic activation and a long-lasting episodic mechanism. The present experiment recorded intracranial ERPs from various structures during a continuous recognition memory task to investigate the respective contribution of the different brain regions to short-and long-delay ERP repetition effects. The results are in good agreement with both the classical neuropsychological literature and the more recent data obtained with functional imagery techniques. They provide electrophysiological evidence of multiple anatomo-functional memory systems in the human brain: a short-term semantic activation system and a long-term episodic memory system, with interface structures that coordinate the functioning of these two systems.
The Energetic Metabolism of Societies: Part II: Empirical Examples
Authors: Haberl Helmut 
Published: July 2002

SummaryPart I of this set of articles proposed methods to account for the energetic metabolism of societies. In this second part, the methods explicated in Part I are used to analyze the energy flows of societies with different “modes of subsistence”: hunter‐gatherers, a contemporary agricultural society in southeastern Asia, and a contemporary industrial society (Austria). The empirical examples are used to demonstrate differences in the “characteristic metabolism” of different modes of sub‐sistence. The energy system of hunter‐gatherers can be described as an “uncontrolled solar energy system,” based mainly upon harvesting biomass without attending to its reproduction. Hunter‐gatherers use only about 0.001% to 0.01% of the net primary production (NPP) of the territory they inhabit. Agricultural societies harness NPP to a much higher extent: Although agriculture often reduces NPP, the amount of biomass that agricultural societies use is much higher (about 20% of potential NPP). Because ecological energy flows are the main source of energy for agricultural societies, NPP strictly limits the energetic metabolism of agricultural societies. Industrial society uses area‐independent energy sources (fossil and nuclear energy), which, however, result in new sustainability problems, such as greenhouse gas emissions. By providing methods to account for changes in energy flows, the metabolism approach proves itself to be a useful concept for analyzing society‐environment interactions. The article demonstrates the difference between the metabolism approach and conventional energy statistics and discusses the significance of the proposed approach for sustainable development.
INTERPRETATIVE MODES OF YIN-YANG DYNAMICS AS AN ASIAN HERMENEUTICS
Authors: Kim Hyun Chul Paul 
Published: July 2002

AbstractThis study attempts to explore and exemplify several hermeneutical modes of biblical interpretation in light of Asian philosophical systems, especially the concept of the dynamic relationship between yin and yang . By applying some key aspects of the yin-yang dynamics and by utilizing relevant biblical cases, the writer aims to suggest the productivity of reading the biblical texts in dialogue with Asian stories, traditions, and worldviews. The study delineates four major aspects of the yin-yang concepts: (1) duality and plurality, (2) both-and in contradiction and paradox, (3) reciprocity and change, and (4) harmony and balance. Each aspect is defined from various ancient Chinese philosophical resources. The one prominent feature of yin-yang dynamics is the idea of duality and plurality, in that one source has two aspects and those bipolar entities together construct a multi-dimensional whole. Within this complex structure, the opposite components exist together in a "both-and" mutuality rather than "either-or" reduction. In265.p65 stead of repelling against or reducing to one, the two contradictory ideas are often placed together in a dynamic correlation. This dynamic correlation is not static but fluid, constantly changing and flowing within the mutual reciprocity. Two opposite entities not only stand side-by-side but also coerce, challenge, and correct each other in a constant mutual interaction. This mutual interaction does not occur at a random accident but rather for the dynamic retrieval, retaining, and return to the centrality of balance. After defining each of these aspects, selected biblical exemplifications are discussed, in order to present a case that there are many parallel—both similar and opposite—ideas, traditions, and worldviews between the biblical texts and the yin-yang concepts. The biblical exemplifications mainly focus on Genesis 1 and 2, though cases from some other places are also discussed. Several prospects for the possible potentialities and limitations of utilizing this yin-yang dynamics are suggested at the conclusion.
NEW EVIDENCE RELATING TO THE PROCESS OF ISLAMIZATION IN PALESTINE IN THE EARLY MUSLIM PERIOD THE CASE OF SAMARIA
Authors: Levy-Rubin Milka 
Published: July 2002

AbstractThere is an ongoing discussion among scholars concerning the date and the pace of the process of Islamization in Palestine during the early Muslim period. Evidence concerning this subject is rare. Muslim sources relate that there was a substantial presence of Muslims in the area of Samaria from the tenth century onwards. It has been presumed until now that this was solely a result of immigration of Arab Muslims to this area. Basing itself upon new evidence found in a local Samaritan chronicle, this article strives to show that a small part of this Muslim population originated in Samaritan population which converted to Islam during the early Muslim period mainly as a result of difficult economic conditions. As of now, this is the only evidence we have of mass conversion to Islam in Palestine during the early Muslim period. It should be emphasized that this evidence cannot be applied automatically to the Jewish and Christian communities in Palestine whose circumstances, though similar, were nevertheless somewhat different.