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  • 1
    Keywords: DDC 512/.72 ; LC QA242 ; Algebras, Linear ; Euclidean algorithm ; Orthogonal polynomials ; Pade´ approximant
    Pages: Online-Ressource (xvii, 446 pages)
    ISBN: 9780444828729
    Language: English
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  • 2
    Unknown
    Amsterdam ; New York : Elsevier Science
    Keywords: DDC 512.9/42 ; LC QA214 ; Equations, Simultaneous - Numerical solutions ; Iterative methods (Mathematics)
    Pages: Online-Ressource (vii, 400 pages)
    ISBN: 9780444827777
    Language: English
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK and Boston, USA : Blackwell Publishers Ltd
    Expert systems 14 (1997), S. 0 
    ISSN: 1468-0394
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Computer Science
    Notes: Russell, Stuart and Norvig, Peter Artificial Intelligence: A Modern ApproachEdwards, Alistair, D.N. (ed.) Extra-Ordinary Human-Computer Interaction: Interfaces for Users with DisabilitiesVacca, John R. VRML: Bringing Virtual Reality to the Internet
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  • 4
    Electronic Resource
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    Oxford, UK and Boston, USA : Blackwell Publishers Ltd
    Expert systems 14 (1997), S. 0 
    ISSN: 1468-0394
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Computer Science
    Notes: The blackboard architecture, originally developed for the system that permits the comprehension of language, HEARSAY II, has later been used in a great variety of domains and in various environments for the construction of systems. From the classic architecture of HEARSAY II, many applications, generalizations, extensions and refinements have been developed. In this paper we present REDSIEX, (RED de SIstemas EXpertos) which is a network of expert systems within a blackboard architecture, for the cooperation solution of distributed problems. The REDSIEX system inherits various of the elements defined by the architecture of HEARSAY II and incorporates new components and organization. These produce a very characteristic and exclusive global work style in the solution of problems, within a conceptual framework of emergent control. The main structural and functional characteristics of REDSIEX are discussed.
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  • 5
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    Oxford, UK and Boston, USA : Blackwell Publishers Ltd
    Expert systems 14 (1997), S. 0 
    ISSN: 1468-0394
    Source: Blackwell Publishing Journal Backfiles 1879-2005
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  • 6
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    Oxford, UK and Boston, USA : Blackwell Publishers Ltd
    Expert systems 14 (1997), S. 0 
    ISSN: 1468-0394
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Computer Science
    Notes: This paper presents an intelligent system to assist small investors to determine stock trend signals for investment in stock business. A pilot system is built providing three main categories of technical and analysis theories, namely momentum, moving average, and support/resistance line. It has extensive graphic interface design to facilitate the usage of the system. For novice investors, the system is associated with tutoring features and it supports analysis study of the rationale behind some system recommendations. Skilful investors can explore the various theories for the prediction by means of adjusting the weightings, combinations and even some independent variables allocated by the intelligent system. General users can therefore formulate their investment strategies upon system recommendations under different investment criteria accordingly.
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  • 7
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    Oxford, UK and Boston, USA : Blackwell Publishers Ltd
    Expert systems 14 (1997), S. 0 
    ISSN: 1468-0394
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Computer Science
    Notes: The manner in which CARMEN (Constraints And Rules Management ENgine), an operational expert system generator developed as part of the ESPRIT project ITHACA, models and acquires knowledge is discussed. Central to CARMEN are three types of control entities (TASKs, MKSs and BKSs) which are used to describe problem-solving at the knowledge-use level. Modeling of domain knowledge is done both at the deep and surface levels. The Integrity Checking Task (or ICT) is used to illustrate the manner in which CARMEN works. We conclude the paper with a comparison of CARMEN with other approaches in knowledge modeling.
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  • 8
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    Boston, USA and Oxford, UK : Blackwell Publishers Inc
    Computational intelligence 13 (1997), S. 0 
    ISSN: 1467-8640
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Computer Science
    Notes: The standard AI method for representing temporal information in a first-order logic is to directly associate the information with a time point or interval via a relation. We present a new paradigm for temporal knowledge representation. All point-based temporal information is translated to real-valued functions in the Cartesian plane. For example, information that is true/false at a point becomes a 0–1 function. Other types of information, such as velocity, are directly represented with real-valued functions. The unique feature of the proposed approach is the use of the Riemann integral to represent interval-based information. Our approach is based on the fact that what is true at every point in an interval completely determines what is true over the interval. We conclude with a formal presentation of a first-order logic that is based on the proposed representation.
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  • 9
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    Boston, USA and Oxford, UK : Blackwell Publishers Inc
    Computational intelligence 13 (1997), S. 0 
    ISSN: 1467-8640
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Computer Science
    Notes: In this paper the idea is presented that human communication is carried through messages that are the result of the integration of a set of communicative acts, some of which are, in a traditional view, contextual phenomena with respect to a main (linguistic) communication act. A formalization of the notion of communicative situation is attempted, which eliminates the distinction between context and main communication acts. The ideas presented in this paper come from a re-thinking of a prototype implemented in 1989 for the ESPRIT Project 527, CFID whose main features are presented in Section 4.
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  • 10
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    Oxford, UK and Boston, USA : Blackwell Publishers Inc.
    Computational intelligence 13 (1997), S. 0 
    ISSN: 1467-8640
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Computer Science
    Notes: In description logics, default knowledge is exclusively treated as incidental rules. However, as few concepts are definable using only strict knowledge, imposing strict definitions leads to terminological knowledge bases that mostly contain partially defined concepts. This is a real problem because such concepts can only be inserted as leaves of the terminology. Moreover, instance recognition is biased as these concepts must be explicitly mentioned as properties of these instances. It follows that partially defined concepts are described with necessary but not sufficient conditions. As a solution to these problems, we propose to integrate defaults in concept definitions and we argue that this is essential for our diagnosis application. We introduce a description language ALεδ with default(δ) and exception(ε) connectives. The cornerstone of our approach is the introduction of a definitional point of view where a default can be part of a concept definition, whereas in the classical inheritance one it is only viewed as a weak implication. We go on to describe a map between the definition of a concept and its inherited properties, and we show that the combination of these definitional and inheritance levels considerably improves the capabilities of classification processes. In particular this allows us to distinguish sure from probable instances and typical from exceptional instances. Finally we provide a specific operation, object refinement, which consists in enlarging object descriptions with exceptions in order to find additional concepts the object is an instance of. This operation is useful for our diagnosis application.
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  • 11
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    Oxford, UK and Boston, USA : Blackwell Publishers Inc.
    Computational intelligence 13 (1997), S. 0 
    ISSN: 1467-8640
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Computer Science
    Notes: We present a mathematical model providing a formal basis for analogical reasoning, referred to as abstractional concept mapping. The approach provides a formal basis for all comparison–based reasoning (e.g., literal similarity, analogy, metaphor, and scientific models) in that given any two descriptions in first–order logic, arbitrary comparisons of similarity are representable as first–order theories (referred to as “comparison theories”), dependent only on the notion of logical truth and not on domain–specific heuristics or particular features of the knowledge representation.
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  • 12
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    Computational intelligence 13 (1997), S. 0 
    ISSN: 1467-8640
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Computer Science
    Notes: Fifteen years of work on nonmonotonic logic has certainly increased our understanding of the area. However, given a problem in which nonmonotonic reasoning is called for, it is far from clear how one should go about modeling the problem using the various approaches. We explore this issue in the context on two of the best–known approaches, Reiter's default logic and Moore's autoepistemic logic, as well as two related notions of “only knowing,” due to Halpern and Moses and to Levesque. In particular, we return to the original technical definitions given in these papers and examine the extent to which they capture the intuitions they were designed to capture.
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  • 13
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    Oxford, UK and Boston, USA : Blackwell Publishers Ltd
    Expert systems 14 (1997), S. 0 
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  • 14
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    Expert systems 14 (1997), S. 0 
    ISSN: 1468-0394
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Computer Science
    Notes: The complexity of the monitored data available in modern intensive care units (ICUs) means that they are best processed, for presentation to medical staff, by expert system techniques. This article describes an expert system that has an appropriately designed inference engine, handling the temporal considerations inherent in monitoring and manages data acquisition via a Medical Information Bus. Also, we will describe how we extended our monitoring system in ICUs by writing an interface allowing communication in dynamic SQL with a relational database management system. The extended system facilitates both permanent filing of case data and the use of filed data by the rules of the expert system, and allows automatic intelligent screening of data prior to permanent filing so as to ensure data reliability.
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  • 15
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    Oxford, UK and Boston, USA : Blackwell Publishers Ltd
    Expert systems 14 (1997), S. 0 
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  • 16
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    Expert systems 14 (1997), S. 0 
    ISSN: 1468-0394
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Computer Science
    Notes: In this paper, we stress the importance of considering evaluation from an overall viewpoint in order to product higher quality Knowledge-based Systems (KBS), that is, measuring attributes of products generated throughout the entire system life cycle rather than the final system alone. A framework for measuring typical products obtained during the development phases is proposed here. This measurement framework includes the definition of the products and the definition of attributes that characterize these products. The attributes are ordered as a multilevel hierarchy. The aim of the measurement framework proposed is to facilitate the application of measurement plans to KBS, using associated metrics. When building this environment, we sought to unify other work in the field of KBS evaluation.
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  • 17
    ISSN: 1468-0394
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Computer Science
    Notes: Scheduling is a prevalent function that is omnipresent throughout many industries and applications (Pinedo, 1995; Morton & Pentico, 1993; Zweben & Fox, 1994; Brown & Scherer, 1995). A great need exists for developing scheduling toolkits that can be generically applied to a number of different scheduling problems. To meet this need, more research is warranted for developing a state-of-the-art generic constraint problem-solver as related to scheduling. This paper discusses the development and testing of the Generically Used Expert Scheduling System (GUESS).
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  • 18
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    Expert systems 14 (1997), S. 0 
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  • 19
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    Expert systems 14 (1997), S. 0 
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  • 20
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    Expert systems 14 (1997), S. 0 
    ISSN: 1468-0394
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Computer Science
    Notes: Much recent research effort in the field of knowledge acquisition (KA) has focussed on extending knowledge acquisition techniques and processes to include a wider array of participants and knowledge sources in a variety of knowledge acquisition scenarios. As the domain of expert systems applications and research has expanded, techniques have been developed to acquire and incorporate knowledge from groups of experts and from various sources such as text, video, and audio tapes. However, the dominant participant-role model remains that of the knowledge engineer eliciting knowledge from one or more human experts. This conceptual gap has contributed to the major divisions in the KA field between researchers interested in manual KA and those developing tools for automated KA. This article considers the wide variety of possible KA scenarios and presents a meta-view of KA participants and the roles they may assume.We suggest that it is more appropriate to think of knowledge acquisition participants as playing one or more roles. These include knowledge sources, agents and targets for KA processes. We also present a participant model drawn from research in decision support systems that more accurately characterizes the diversity of the entities participating in the KA process. This view is more inclusive as it allows us to consider both human-human and human-computer KA interactions as well as the whole variety of knowledge sources and targets. A careful consideration of the meta-view and its associated role-participant mappings also yields the new ideas of the elemental and composite role and the multi-role entity. These new constructs are then used to identify areas where research is currently needed and to generate specific research issues. Taken altogether, this view allows a more flexible consideration of the many possible combinations that can and frequently do occur in actual KA situations.
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  • 21
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    Expert systems 1 (1984), S. 0 
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  • 22
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    Expert systems 1 (1984), S. 0 
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  • 23
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  • 24
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  • 25
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  • 26
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  • 27
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    Expert systems 1 (1984), S. 0 
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    Topics: Computer Science
    Notes: Abstract: This paper considers an application of decision aiding for maritime operations, viz the design of an intelligent operator aid for dynamic route planning. The limitations of some existing methods are discussed and an Al approach is proposed that combines algorithmic and heuristic processing elements within an embedded system. The aid consists of three elements: a intelligent front end, a route planner and an explanation facility.
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    Notes: Abstract: Recent developments in a subarea of computer science called artificial intelligence have included the creation of expert systems that are capable of solving difficult applications problems which require expert knowledge for their solution. Such expert systems have been found to be useful in a number of applications (e.g. medicine, biochemistry and mineral exploration). In this paper the author presents an expert system for solving problems concerning income and transfer tax planning for individuals In developing this system, a theoretical structure and a set of decision rules were specified and then programmed into a rule-based system that had previously been used for medical diagnosis (Mycin [1]) Once the system was developed, its problem-solving capabilities were refined and verified by a panel of tax experts using a blind verification procedure. This verification step demonstrated that an expert system could be developed in that domain.
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  • 29
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  • 30
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    Notes: Abstract: The purpose of this paper is to design an expert system or an intelligent procedure' that purports to screen hazard potentials of environmental chemicals on the basis of structure-activity relationships in the study of chemical carcinogenesis, particularly with respect to analysing the current state of known structural information about chemical carcinogens and predicting the possible carcinogenicity of untested chemicals An analysis of a computerised database of known carcinogens (knowledge base) is being performed using the structure-activity trees in order to test the validity of the tree as a classification scheme (inference engine) and to evaluate trends or patterns that may exist between chemical structure and specificity for target tissue, route of administration, and animal species. Practical applications of the structure-activity tree depend on its eventual validation as a predictor of carcinogenic activity.
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  • 32
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  • 33
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    Notes: Abstract: Activities concerning expert systems in Japan are outlined. Expert systems are receiving increasing attention in Japan, together with fifth-generation computers. Rather than describing the details of individual systems, a variety of expert systems are briefly introduced with their aims and features.
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    Notes: Abstract: Analysis of the job shop scheduling domain has indicated that the crux of the scheduling problem is the determination and satisfaction of a large variety of constraints. Schedules are influenced by such diverse and conflicting factors as due date requirements, cost restrictions, production levels, machine capabilities and substitutability, alternative production processes, order characteristics, resource requirements, and resource availability. This paper describes ISIS, a scheduling system capable of incorporating all relevant constraints in the construction of job shop schedules. We examine both the representation of constraints within ISIS, and the manner in which these constraints are used in conducting a constraint-directed search for an acceptable schedule. The important issues relating to the relaxation of constraints are addressed. Finally, the interactive scheduling facilities provided by ISIS are considered.
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    Notes: Abstract: Log interpretation science is a controversial and rapidly changing domain. Designing interpretation models is a highly experimental process which involves trials with a computer program as an integral part of the design. Therefore conventional software engineering techniques, which require a complete specification of the problem before the program is written, are often not applicable or fail to produce high quality software. The development of expert systems has provided the techniques, tools, and capabilities to let us seek alternate methods to produce log interpretation software: exploratory programming environments and automatic programming systems. An exploratory programming environment combines the power of interactive graphics and programming tools to merge the design and programming tasks into a single process where model and program develop together. An automatic programming system will embody the knowledge of the programming process and of some log interpretation heuristics to produce log processing programs from interactive specifications expressed in familiar terms. These facilities will allow log interpretation model designers, who are non-computer specialists, to produce high quality software as the end result of a model design.
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    Expert systems 14 (1997), S. 0 
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    Topics: Computer Science
    Notes: Software debugging (the diagnosis and repair of faults in software) can be a difficult and time consuming problem. In many cases a problem which can take an inexperienced developer a long time to correct can be quickly identified and corrected by a more experienced one. This is often because they have seen that problem (or a similar one) before. In this paper we present a system (called WATSON) which automatically constructs an explanation of the fault and a repair strategy from a library of partial repair models. This system exploits Case Based Reasoning (CBR) technology to perform this construction. The paper introduces the concepts behind CBR before going on to describe the components of the WATSON system. It then illustrates, by example, how WATSON constructs a diagnosis and repair model from the case databases.
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    Topics: Computer Science
    Notes: The binary version of the school timetabling (STT) problem is a real-world example of a constraint network that includes only constraints of inequality. A new and useful representation for this real-world problem, the STT_Grid, leads to a generic decomposition technique. The paper presents proofs of necessary and sufficient conditions for the existence of a solution to decomposed STT_Grids. The decomposition procedure is of low enough complexity to be practical for large problems, such as a real-world high school.To test the decomposition approach, a typical high school was analyzed and used as a model for generating STT_Grids of various sizes. Experiments were conducted to test the difficulty of large STT networks and their solution by decomposition. The experimental results show that the decomposition procedure enables the solution of large STT_Grids (620 variables for a real school) in reasonable time. The constraint network of a typical STT_Grid is sparse and belongs to the class of easy problems. Still, due to the sizes of STTs, good constraint satisfaction problem search techniques (i.e., BackJumping and ForwardChecking) do not terminate in reasonable times for STT_Grids that are larger than 300 variables.
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    Computational intelligence 13 (1997), S. 0 
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    Topics: Computer Science
    Notes: This paper investigates perceptual grouping from a logical point of view, defining a grouping interpretation as a particular kind of logical expression, and then developing an explicit inference theory in terms of such expressions. First, a regularity-based interpretation language is presented, in which an observed configuration is characterized in terms of the regularities(special configurational classes, e.g. nonaccidental properties) it obeys. The most preferred interpretation in such a system is shown to be the most-regular (maximum “codimension”) model the observed configuration obeys, which is also the unique model in which it is generic(typical). Inference then reduces to a straiightforward exercise in LogicProgramming. Because generic model assignment involves negation, this reduction requires that a version of the Closed World Assumption (CWA) be adopted.Next, this entire regularity-based machinery is generalized to the grouping problem: here an interpretation is a hierarchical recursive) version of a model called a parse tree.For a given number of dots and a fixed choice of regularity set, it is possible to explicitly enumerate the complete set of possible grouping interpretations, partially ordered by their degree of regularity (codimension). The most preferred interpretation is the one with maximum codimension (i.e., the most regular interpretation), which we call the qualitative parse. An efficient procedure (worst case $O(n^2)$) for finding the qualitative parse is presented. The qualitative parse has a unique epistemic status: given a choice of regularity set, it is the only grouping interpretation that both (a) is maximally regular, and (b) satisfies the CWA. This unique status, it is argued, accounts for the perceptually compelling quality of the qualitative parse.
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    Notes: There are numerous logical formalisms capable of drawing conclusions using default rules. Such systems, however, do not normally determine where the default rules come from; i.e., what it is that makes Birds flya good rule, but Birds drive trucksa bad one.Generic sentences such as Birds fly are often used informally to describe default rules. I propose to take this characterization seriously, and claim that a default rule is adequate if the corresponding generic sentence is true. Thus, if we know that Tweety is a bird, we may conclude by default that Tweety flies, just in case Birds fly is a true sentence.In this paper, a quantificational account of the semantics of generic sentences is presented. It is argued that a generic sentence is evaluated not in isolation, but with respect to a set of relevant alternatives. For example, Mammals bear live young is true because among mammals that bear live young, lay eggs, undergo mitosis, or engage in some alternative form of procreation, the majority bear live young. Since male mammals do not procreate in any form, they do not count. Some properties of alternatives are presented, and their interactions with the phenomena of focus and presupposition is investigated.It is shown how this account of generics can be used to characterize adequate default reasoning systems, and several desirable properties of such systems are proved. The problems of the automatic acquisition of rules from natural language are discussed. Because rules are often explicitly expressed as generics, it is argued that the interpretation of generic sentences plays a crucial role in this endeavor, and it is shown how the theory presented here can facilitate such interpretation.
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    Notes: We use the idea that actions performed in a conversation become part of the common ground as the basis for a model of context that reconciles in a general and systematic fashion the differences between the theories of discourse context used for reference resolution, intention recognition, and dialogue management. We start from the treatment of anaphoric accessibility developed in discourse representation theory (DRT), and we show first how to obtain a discourse model that, while preserving DRT's basic ideas about referential accessibility, includes information about the occurrence of speech acts and their relations. Next, we show how the different kinds of ‘structure’ that play a role in conversation—discourse segmentation, turn-taking, and grounding—can be formulated in terms of information about speech acts, and use this same information as the basis for a model of the interpretation of fragmentary input.
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    Notes: A representation scheme for verbs and prepositions specifying path and locative information is developed. The representation emphasizes the implementability of the underlying semantic primitives. The primitives pertain to mechanical characteristics such as geometric relationships among objects, force or motion characteristics implied by verbs, and their prepositional modifiers. This representation has been used to animate the performance of tasks underlying natural language imperatives.
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    Notes: Multimodality is a powerful concept for dealing with dialogue cohesion in a human–computer natural language (NL)-centered system. This work is a modest step toward more effective exploitation of the potentially large bandwidth of communication provided by this situation. The relations between exploration, navigation, and NL-based communication are discussed in general and with reference to two prototypes. Light cognitive load feedback and direct manipulation are proposed so that user and system can cooperate in mutually establishing the structure of the ongoing dialogue. The main points are: (i) use of an appropriate dialogue structure to constrain inference in the anaphora resolution process; (ii) use of a graphical representation of the structure, to limit the problem of opacity; (iii) allowance for the possibility of direct manipulation on this representation, to avoid the necessity of operating linguistically at the metalevel. The context of the work is within NL-centered multimodal information access systems, in which basic entities are pairs (most commonly question and answer). A dialogue model is provided by a modified version of the centering model; it is both sufficiently simple to be displayed in an intuitive fashion on the screen, and sufficiently powerful to give accurate results. An extension of the discourse model, oriented to the treatment of deixis, is also proposed. Finally, steps toward an overall approach to the integration of navigational and mediated aspects of interaction are discussed.
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    Notes: A computational model of problem solving based on significant aspects of human problem solving is introduced. It is observed that during problem solving humans often start searching more or less randomly, becoming more deterministic over time as they learn more about the problem. This two-phase aspect of problem-solving behavior and its relation to learning is one of the important features this model accounts for. The model uses an accelerated simulated annealing technique as a search mechanism within a real-time dynamic programming-like framework upon a connected graph of neighboring problem states. The objective value of each node is adjusted as the model moves between nodes, learning more accurate values for the nodes and also compensating for misleading heuristic information as it does so. In this manner the model is shown to learn to more effectively solve isomorphs of the Balls and Boxes and Tower of Hanoi problems. The major issues investigated with the model are (a) whether such a simulated annealing-based model exhibits the kind of random-to-directed transition in behavior exhibited by people, and (b) whether the progressive discovery of the objective function, even when given very little or poor initial information, is a plausible method for representing the learning that occurs during problem solving and the knowledge that results from that learning.
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    Notes: Presuppositionis a pervasive feature of human language. It involves many interesting interactions between the utterances of a discourse and the contextof the discourse. In this paper we focus on issues of logical form connected with the interaction of presupposition and discourse context, and illustrate our theory with some implementational work using the active logicframework. After reviewing some of the major issues in presupposition theory we turn to a largely successful unified approach of Heim. We show how the main principles of this theory can be implemented in active logic. But we also find two serious difficulties. These consist in (a) a straightforward counterexample and (b) a type of discourse that we call a garden-path discourse. We maintain that both the counterexample and the garden-path type of discourse can be handled by our active-logic version of Heim's theory. This requires us to reformulate and extend Heim's theorey. Although this work is largely theoretical, both Heim's theory and ours have important things to say about the incremental processing of the utterances that make up discourse. And we present our theory as a specification of a processing device that takes logical form of a sentence along with current discourse context as input and delivers an updated discourse context as output. As an experiment, we have implemented portions of this device.
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    Notes: This paper presents a novel approach to model–based diagnosis. The approach addresses the two main problems that have prevented model–based diagnostic techniques from being widely used: computational complexity of abduction and inadequacies of device models. A model for automated diagnosis is defined that combines (1) deduction to rule out hypotheses, (2) abduction to generate hypotheses, and (3) induction to recall past experiences and account for potential errors in the device models. A review of the three forms of inference is provided, as well as a detailed analysis of the relationship between case–based reasoning and induction. The proposed model for diagnosis is used to characterize diagnostic errors and relate them to different types of errors in the device models. Experimental results are then described and used to assert the practicality and the usefulness of the approach. The model presented in this paper yields a practical method for solving hard diagnostic problems at a reasonable computational cost and provides a theoretical basis for overcoming the problem of partially incorrect device models.
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    Notes: In ordinary first–order logic, a valid inference in a language L is one in which the conclusion is true in every model of the language in which the premises are true. To accommodate inductive/uncertain/probabilistic/nonmonotonic inference, we weaken that demand to the demand that the conclusion be true in a large proportion of the models in which the relevant premises are true. More generally, we say that an inference is [p,q] valid if its conclusion is true in a proportion lying between p and q of those models in which the relevant premises are true. If we include a statistical variable binding operator “%” in our language, there are many quite general (and useful) things we can say about uncertain validity. A surprising result is that some of these things may conflict with Bayesian conditionalization.
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    Notes: An algorithm for semantic interpretation that integrates the determination of the meaning of verbs, the attachment and meaning of prepositions, and the determination of thematic roles is presented. The parser does not resolve structural ambiguity, which is solely the task of the semantic interpreter. Lexical semantic information about nouns and verbs is applied to the resolution of verb polysemy and modifier attachment. Semantic interpretation is centered on the representation of the meaning of the verb, called verbal concept. Verbal concepts are organized into a classification hierarchy. As long as the meaning of the verb remains unknown, parsing proceeds on a syntactic basis. Once the meaning of the verb is recognized, the semantic component makes sense of the syntactic relations built so far by the parser and of those still to be parsed. The algorithm has been implemented and tested on real–world texts.
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    Corporate governance 5 (1997), S. 0 
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    Corporate governance 5 (1997), S. 0 
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    Topics: Political Science , Economics
    Notes: The twentieth century has seen a sea change in the concentration of ownership of U.S. corporations. Early in the century Berle and Means identified the divorce of ownership from control as the central corporate governance problem, but since the 1970’s ownership has been re’rating into the hands of fiduciary institutions – most notably pension funds and mutual funds. By the 1990s fiduciaries collectively owned over 50% of the outstanding equity of the 1,000 largest corporations. This new pattern of ownership, fiduciary capitalism, has begun to raise important policy questions including: How can agents (fiduciaries) effectively monitor other agents (boards of directors)? What are the social implications of universal ownership where fiduciaries own substantial stakes in virtually all of the corporations in a country, and, finally, What does it mean to maximize shareholder wealth when fiduciaries are universal owners?
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    Corporate governance 5 (1997), S. 0 
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    Topics: Political Science , Economics
    Notes: This paper outlines the conceptual, cultural, contextual and disciplinary scope of the rapidly evolving topic of corporate governance. As a basis for improving the rigour of research and analysis, some definitions are suggested. Reasons for the diversity of view-points and concerns are considered. To provide an orientation for new scholars and those from specialised disciplines, recent surveys of corporate governance are reviewed from their ethnocentric, contextual, and intellectual contingencies. The prospects of developing the topic as a “science of organization” are considered along with areas for future research.
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    Corporate governance 5 (1997), S. 0 
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    Topics: Political Science , Economics
    Notes: The publication in the UK of the Cadbury Report and its associated Code of Best Practice focused attention on the conduct and structure of boards in large companies. The Code suggested that greater financial accountability would be facilitated by increasing the number of non-executive directors, creating new sub-committees and ensuring that the power of the chair is limited. Surveys amongst FT100 companies show that their compliance with the Cadbury Code has been rapid and virtually complete (Bostock [1995], Cadbury [1995]); less attention has been paid to the compliance of small and medium-sized companies. The approach that is taken in this survey is to investigate the board structures chosen by these enterprises as they prepare for stock market listing. Companies are prepared for market with the advice of professional advisors who it is assumed have a reputational interest in the success of the issue; therefore, they advance corporate governance structures that satisfy potential investors’ expectations. Such companies are making their boards anew and should represent best-practice. This paper examines whether current practice in small and medium-sized companies conforms to the prescribed model for UK boards. It is concluded that the Cadbury Code is not the only model for emergent small to medium sized companies and that the market does not value its adoption in all cases.
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    Corporate governance 5 (1997), S. 0 
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    Notes: This Australian study utilises disclosure requirements in accordance with Australian Accounting Standards AASB 1017: Related Party Disclosures, to provide a richer description of non-executive director characteristics. Consistent with the findings of Baysinger and Butler (1985) we find a three scale classification system for directors (insider, grey area, outsider) to better reflect board composition.The results indicate that 35% of non-executive directors were involved in transactions with their companies which potentially threaten their independence (i.e. grey area directors). On average, our findings reveal that the combination of insider and ‘grey’ area directors would constitute a majority of the board. This could lead to companies appearing to comply with current Australian recommendations through possessing a non-executive majority on the board, whilst in fact being controlled by internal management. This finding similarly applied to the composition of the audit committee.
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    Notes: Corporate Governance – responsibilities, risks and remuneration by Kevin Keasey and Mikie Wright
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    Notes: A considerable amount of attention has recently been given to the lack of equality for women in the economic arena. Women are systematically disadvantaged in many ways in terms of pay for the same job, promotion prospects and access to the most important top jobs in the United Kingdom. In this paper we present new evidence on women participation rates in UK boardrooms. In particular, our objectives are to (i) examine the proportion of executive and non-executive directors who are women (ii) to document the degree to which women are deployed to key boardroom committees.
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    Notes: Board activists continue to suggest – even demand – that the CEO and board chairperson positions be held separately, to ensure governance independence at board level. A regression analysis of large corporations provides no evidence of differences in independence across a range of dimensions. Even when the positions are held separately, the chairperson is often the former CEO, holds substantial equity in the firm and, in many cases, has familial ties to current executives.
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    Notes: This study examined views of women directors on criteria for their being selected, reasons for serving and benefits derived from their directorships. Data were collected from 280 women serving on Canadian corporate boards of directors using anonymous questionnaires. A successful career in traditional business organizations emerged as the major selection criteria. Personal contacts and visibility to male board members was essential. Company/industry interest and broadening skills and knowledge motivated women’s board service. Finally women board members reported considerable benefits from serving. Efforts to broaden the selection and nomination process to include more qualified women may benefit women, men and organizations.
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    Notes: This paper is based on a large and comprehensive survey of the investor relations process in large UK companies. The survey was primarily designed to investigate investor relations, secondarily to explore links between investor relations procedures and improvements in corporate governance. Of the independent variables, the size of company has the greatest association with measures of well organised and controlled investor relations. The use of a non–executive chairman also has a positive association. The proportion of non–executive directors does not appear to influence whether investor relations are well organised and successful.
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    Notes: This paper describes a process for the evaluation of the Chairperson by his or her fellow board members. It has been developed in close co-operation between academics and practitioners and has been successfully tested in different companies. Frequently, there is a fairly high threshold to be overcome before companies agree to such a step. They fear a dismantling of the authority of the Chairman or a “Götterdämmerung” in the board room. These fears are unfounded if the process is handled with care and embedded in a culture of learning; learning even at the level of the board. In such cases, all parties involved (and, in particular, the Chairman) found the process very helpful, and satisfaction was widespread despite considerable initial hesitation and uneasiness.
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    Notes: Over the past eleven years, activists – particularly public pension funds such as the California Employees Retirement System (CalPERS) – are credited with prompting boards to roust underperforming management at some of the largest US corporations, and they have pushed for reforms in areas ranging from compensation to corporate strategy. Evidence for shareholders’ increased interest in corporate governance is clear. In the 1984–5 proxy season, shareholder resolutions totaled 275, and the average vote was 5.74%; by 1991–2, resolutions and the average vote on them had climbed to 487 and 24.06%, respectively. In 1992, shareholders were also successful in pushing through regulatory changes that gave them the right to communicate with each other outside the management–dominated proxy system.After 11 years of shareholder activism, where does the movement stand today? Understanding the development of the shareholder–rights movement, the prospects for governance reform, and the future evolution of the movement requires a sophisticated understanding of how the politics of corporate control is accomplished and, in particular, the important role that social structure plays. In this article, we suggest that social movement theory, which sociologists have used to explain collective action by groups ranging from the Civil Rights movement to Mothers Against Drunk Driving, provides a useful tool for analysing owner–management conflicts, and in particular, the recent rise of the shareholder–rights movement in the United States. After briefly discussing the traditional economic view of corporate governance and its shortcomings, we argue that more–or–less organized politics is an essential ingredient of the American system of corporate governance. We then present a social movement framework to explain the rise in investor activism. We conclude by continuing our application of this framework to examine the maturation of this movement and to assess its future, in part by comparing it to other contemporary, confrontational movements.
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    Corporate governance 5 (1997), S. 0 
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    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Political Science , Economics
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    Corporate governance 5 (1997), S. 0 
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    Topics: Political Science , Economics
    Notes: It is widely acknowledged that the impetus for the setting up of the CadburyCommittee on corporate governance was the series of scandals that became public in the late 1980's. And whilst hard cases do not always help in making good laws, they can sometimes prompt us into reflective action to consider what arrangements might prevent these problems from occurring in the future. This paper seeks to describe and examine a hard case that poses corporate governance questions regarding distributive justice and the appropriate form of procedure that might satisfy its demands. The hard case in question is that of Turner and Newall (T&N) and its handling of its asbestos liabilities. This case raises many ethical issues (secrecy, duties of care, distributive justice, informed consent, corporate responsibility) which can only be touched upon in this brief examination which is mainly focused upon the issue of corporate responsibility arising from this firm’s predicament.The case will be discussed as follows: first, the facts as they are known will be described concerning the asbestos risks and damage liabilities of T&; secondly, the policy and practice of T&N in dealing with this issue will be outlined; thirdly, the moral inadequacies of their response will be highlighted; then a contrast will be drawn with the strategy adopted in the USA by the Johns-Manville Corporation; and finally, one possible alternative solution will be proposed and its wider lessons for corporate governance considered.
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    Topics: Political Science , Economics
    Notes: This précis is from Research Paper #1/96, by Jennifer Hill, and published by the Australian Investment Managers’ Association, 1996. It supplements, as a matter of record, the conclusions of the UK report of a study group chaired by Sir Richard Greenbury, and published in Corporate Governance – an international review.
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    Corporate governance 5 (1997), S. 0 
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    Topics: Political Science , Economics
    Notes: In 1993 the Executive Board of the Mass Transit Railway Corporation (MTRC) in Hong Kong approved the implementation of a corporate wide manpower and succession planning process. Succession at executive director level was identified as a priority. It was recognised that it would be necessary to identify and assess skills appropriate to company ‘direction’ as distinct from ‘management’ in order to proceed with succession planning at director level and to identify director training and development needs.Two crucial questions emerged: was it possible to identify the core competencies that are required by executive directors? If so, could those competencies be measured and assessed objectively? The experiences of the MTRC in identifying director competencies and in designing, validating and implementing the assessment process during 1994 and 1995 suggests that they can. Their experience forms the basis of this paper.The relatively sparse literature on the identification of director-level competencies is discussed. The competencies identified by the MTRC are outlined. The development of assessment centres, which are widely used to assess core competencies in managerial and professional roles, is then explained. Finally, the experience of the MTRC in extending the use of assessment centres to appraise board-level governance rather than managerial competencies is described and conclusions drawn.
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    Corporate governance 5 (1997), S. 0 
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    Topics: Political Science , Economics
    Notes: This article considers notions of accountability and governance in the charitable sector. It suggests a model of accountability based on a case study of a well known, but anonymous charity. The opportunities for voluntary bodies are increasing and more state funds are becoming available; but with them comes a demand for more public accountability. A definition of accountability is proposed and the extent of the charity’s compliance discussed. From this inventory of compliance, conclusions are drawn as to reforms needed in the charity’s structure and management if it is to become more in tune with its environment.
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    Corporate governance 5 (1997), S. 0 
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    Topics: Political Science , Economics
    Notes: Stakeholder theory has been widely offered as a corrective to perceived defects of business and business ethics, and as an alternative model of corporate governance. Indeed, it is now advocated so commonly as to have become a new orthodoxy. Far from being a source of improvements, however, stakeholder theory is fundamentally misguided, incapable of providing better corporate governance, business performance or business conduct. Stakeholder theory is indeed intrinsically incompatible with all substantive objectives, and undermines both private property and accountability.
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    Topics: Political Science , Economics
    Notes: A cybernetic perspective is used to evaluate firms with or without stakeholder participation in their information and control architecture. This approach also provides a basis for evaluating firms with more than one board or control centre as found in Japan, Europe, and labour-managed firms. Empirical evidence supports the hypothesis that multi control centres with stakeholder participation can provide competitive advantages. This hypothesis is supported by the Law of Requisite Variety and the Williamson analysis of why Multi-divisional firms provide advantages over Unitary Form firms. The opportunity to support stakeholder governance with stakeholder ownership is identified from an analysis of how corporate rights of perpetual succession permits investors to be overpaid. The public policy implications of investor overpayments are considered. Also considered is the use of cybernetic principles to introduce self-regulation as proposed by the US Vice President. Policy initiatives are identified to build a ‘stakeholder economy’ as proposed by the Leader of the Labour Party in Britain. The paper concludes that appropriate stakeholder governance could improve equity and self-governance in the private sector, the quality of democracy in the public sector, and the efficiency of both sectors.
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    Topics: Political Science , Economics
    Notes: In this paper we first describe recent developments which have seen the emergence of a stronger regulatory structure for United Kingdom charities. Secondly, we outline the radical proposal to change the financial accounting practices of charities. These proposals are designed to provide the financial criteria for monitoring and ensuring greater accountability of charities. Finally we question what effect will these changes have had on the rest of the European charitable sector? How different is the ‘British Model’ from other European countries? Will other European States follow the ‘British Model’? Or has the ‘British Model’ lessons it could learn from its partner states? To effect an answer we illustrate from our recent survey the current audit, accounting and supervision practices in the other European Union States with the exception of Greece.
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    Topics: Political Science , Economics
    Notes: Institutional shareholders are increasingly being urged to take a more active role in the governance of the companies in which they invest. In particular, attention has focused on the level of voting by institutions at annual general meetings, which has historically been rather low, and many commentators argue that institutions (particularly the pension funds) should have a legal duty to exercise their voting rights on behalf of their beneficiaries. This paper examines the issues regarding institutional voting and considers whether mandatory institutional voting is likely to lead to more active institutional involvement in corporate governnance at the individual firm level. In particular, it is argued that the imposition of mandatory voting is unlikely to result in informed voting, which is essential if the objective of increasing effective institutional involvement in corporate governance is to be met. This paper concludes that the imposition of mandatory voting is unlikely to result in a change in the investment and ownership ethos of the institutions.
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    Computational intelligence 13 (1997), S. 0 
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    Topics: Computer Science
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    Computational intelligence 13 (1997), S. 0 
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    Topics: Computer Science
    Notes: Intensional negative adjectives alleged, artificial, fake, false, former, and toyare unusual adjectives that depending on context may or may not be restricting functions. A formal theory of their semantics, pragmatics, and context that uniformly accounts for their complex mathematical and computational characteristics and captures some peculiarities of individual adjectives is presented.Such adjectives are formalized as new concept builders, negation-like functions that operate on the values of intensional properties of the concepts denoted by their arguments and yield new concepts whose intensional properties have values consistent with the negation of the old values. Understanding these new concepts involves semantics, pragmatics and context-dependency of natural language. It is argued that intensional negative adjectives can be viewed as a special-purpose, weaker, conntext-dependent negationin natural language. The theory explains and predicts many inferences licensed by expressions involving such adjectives. Implementation of sample examples demonstrates its computational feasibility. Computation of context-dependent interpretation is discussed.The theory allows one to enhance a knowledge representation system with similar concept building, negation-like, context-dependent functions, the availability of which appears to be a distinct characteristic of natural languages.
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    Topics: Computer Science
    Notes: This is a position paper concerning the role of empirical studies of human default reasoning in the formalization of AI theories of default reasoning. We note that AI motivates its theoretical enterprise by reference to human skill at default reasoning, but that the actual research does not make any use of this sort of information and instead relies on intuitions of individual investigators. We discuss two reasons theorists might not consider human performance relevant to formalizing default reasoning: (a) that intuitions are sufficient to describe a model, and (b) that human performance in this arena is irrelevant to a competence model of the phenomenon. We provide arguments against both these reasons. We then bring forward three further considerations against the use of intuitions in this arena: (a) it leads to an unawareness of predicate ambiguity, (b) it presumes an understanding of ordinary language statements of typicality, and (c) it is similar to discredited views in other fields. We advocate empirical investigation of the range of human phenomena that intuitively embody default reasoning. Gathering such information would provide data with which to generate formal default theories and against which to test the claims of proposed theories. Our position is that such data are the very phenomena that default theories are supposed to explain.
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