"Ziel dieses Beitrags ist, die Luhmannsche Systemtheorie auf eine Modellierung mittels Fuzzy-Logik umzustellen und somit die Theorie autopoietischer Sozialsysteme in Richtung einer Theorie der Fuzzy-Systems fortzuentwickeln. Mit Hilfe der Fuzzy-Logik wird es möglich, Vagheiten von Systemzugehörigkeiten und vage Codierungsprozesse zu modellieren, ohne auf akteur- oder organisationstheoretische Modelle zurückgreifen zu müssen. Dies führt u.a. zu einer Neubestimmung der Vorstellung von Polykontexturalität als Poly-Optik sowie von Systemüberschneidungen." (Autorenreferat)
The article provides a systematic test of the consequences of electoral rules for the format of party systems and the frequency of single-party majority cabinets. The test is based on Lijphart's 1994 dataset (extended to 1 November 2002), but excludes some of his cases and introduces an additional indicator of number of parties. Thanks to these changes in research design, the variance explained by multivariate regression is much higher than Lijphart's results, especially in respect of elective parties. However, the post-1990 data reflect a decline in the predictive power of the main independent variable (`effective' threshold). In explaining this decline, the author argues that account should be taken of a previously neglected factor, i.e. the growing destructuration of Western parties and party systems since the late 1980s. Indeed, entering an indicator of such a process into regressions (total net volatility) compensates for all the threshold's lost explanatory power, thus suggesting that structural consolidation is a crucial condition for the operation of electoral systems.
AbstractAlthough many information systems (IS) design methods and techniques are available to IS professionals, none of them completely supports the design process. One of the problems is that there is a mismatch between IS design method; and the system to be built. Actually, in designing an IS, the methods or techniques employed should match the types and characteristics of the system to be built. Thus paper will explore the relationship between IS types/characteristics and systems design methods, and provide IS designers with a systems framework to develop methods or techniques that match the types and characteristics of IS.
In: Trivellato , D 2012 , ' Protecting information in systems of systems ' , Doctor of Philosophy , Mathematics and Computer Science , Eindhoven . https://doi.org/10.6100/IR737558
Systems of systems are coalitions of autonomous and heterogeneous systems that collaborate to achieve a common goal. The component systems of a system of systems often belong to different security domains, which are governed by different authorities (hereafter called parties). Furthermore, systems of systems are mostly dynamic, with systems joining and leaving a coalition at runtime. An example of system of systems is the anti-piracy operation headed by the European Union (EU) that is currently taking place in the Horn of Africa, which involves ships from different EU countries. The security challenges in systems of systems are different from those affecting centralized systems. In a dynamic, inter-organizational coalition of systems, parties might not "know" each other beforehand, might employ different data and organizational models and speak different languages. Nevertheless, they must be able to collaborate for the success of the coalition. We identify four main requirements that an access control framework for systems of systems should satisfy: (1) regulate the access to sensitive information exchanged within a coalition and protect the confidentiality of the collaborating parties' security policies, (2) preserve the autonomy of parties in the choice of organizational models and vocabulary, and (3) guarantee interoperability among parties. In addition, (4) the framework must be easy to use and to deploy into existing systems of systems. Several security frameworks for systems of systems have been proposed in the literature. These frameworks can be divided into two categories: semantic frameworks and trust management (TM) frameworks. Semantic frameworks rely on ontologies for the specification of access control policies and the definition of domain knowledge and context information. This enables interoperability among parties at the cost of limiting the expressive power of the policy language, which does not allow the specification of several types of security constraints (e.g., separation of duty). On the other hand, TM frameworks rely on an attribute-based approach to access control where access decisions are based on digital certificates, called credentials. TM frameworks employ expressive policy languages to regulate the access to sensitive information. However, they either assume all parties in a system of systems to use the same vocabulary, or do not provide a mechanism to align different vocabularies. Furthermore, most TM frameworks compromise the confidentiality of the parties' security policies in the process of deriving the credentials required for an access decision. Thus, none of the existing frameworks satisfies all the security requirements of systems of systems. In this thesis we present an access control framework for systems of systems satisfying all the aforementioned requirements. The framework regulates the access to sensitive information by combining context-aware access control models with TM. Autonomy and interoperability are enabled by the use of ontology-based services. More precisely, parties may refer to different ontologies in the specification of their policies and to describe domain knowledge and context information; this allows each party to employ the organizational model and terminology that they consider more appropriate within their system. A semantic alignment technique is then employed to align their vocabularies, allowing for mutual understanding. A novel distributed algorithm enables parties to derive the credentials required for an access decision without compromising the confidentiality of their policies. The applicability of the proposed framework is demonstrated by a prototype implementation for a scenario in the maritime safety and security domain. In the prototype, all components and services have been implemented following the serviceoriented architecture paradigm to facilitate their integration and deployment into existing systems of systems. The modularity of the framework allows for the integration of additional services to support the evaluation of policies and provide additional functionalities (e.g., a key performance indicator service). Even though our solution has been mainly tested in the maritime safety and security domain, its characteristics make it suitable for many other domains. For example, we have deployed a prototype implementation of the framework also in systems of systems in the e-health and the employability domains. Furthermore, the integration of the framework with ontology-based services makes it a valid candidate for the protection of information on the semantic web.
I Social Systems -- 1 System Theory: A Survey -- 2 System Cell and Classification -- 3 The Concept of an Objective -- 4 Paradigm of a Social System -- 5 Models of Social Systems -- 6 Collective Systems without Communication -- 7 Collective Systems with Communication -- 8 Autonomous Two-Person Systems without Communication -- 9 Autonomous n-Person Systems and Dynamic Games -- 10 Two-Person Cooperative Games -- 11 Cooperative Games with n Persons -- 12 Hierarchical Systems -- 13 Conclusions -- Problems, Part I -- II Learning Systems -- 14 Learning Systems -- 15 Taxonomy of Learning Systems -- 16 Applications -- Problems, Part II -- References, Part I -- References, Part II -- Index, PartI -- Index, Part II.
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The open access book covers a large class of nonlinear systems with many practical engineering applications. The approach is based on the extension of linear systems theory using the Volterra series. In contrast to the few existing treatments, our approach highlights the algebraic structure underlying such systems and is based on Schwartz's distributions (rather than functions). The use of distributions leads naturally to the convolution algebras of linear time-invariant systems and the ones suitable for weakly nonlinear systems emerge as simple extensions to higher order distributions, without having to resort to ad hoc operators. The result is a much-simplified notation, free of multiple integrals, a conceptual simplification, and the ability to solve the associated nonlinear differential equations in a purely algebraic way. The representation based on distributions not only becomes manifestly power series alike, but it includes power series as the description of the subclass of memory-less, time-invariant, weakly nonlinear systems. With this connection, many results from the theory of power series can be extended to the larger class of weakly nonlinear systems with memory. As a specific application, the theory is specialised to weakly nonlinear electric networks. The authors show how they can be described by a set of linear equivalent circuits which can be manipulated in the usual way. The authors include many real-world examples that occur in the design of RF and mmW analogue integrated circuits for telecommunications. The examples show how the theory can elucidate many nonlinear phenomena and suggest solutions that an approach entirely based on numerical simulations can hardly suggest. The theory is extended to weakly nonlinear time-varying systems, and the authors show examples of how time-varying electric networks allow implementing functions unfeasible with time-invariant ones. The book is primarily intended for engineering students in upper semesters and in particular for electrical engineers. Practising engineers wanting to deepen their understanding of nonlinear systems should also find it useful. The book also serves as an introduction to distributions for undergraduate students of mathematics.
Impure systems contain Objects and Subjects: Subjects are human beings. We can distinguish a person as an observer (subjectively outside the system) and that by definition is the Subject himself, and part of the system. In this case he acquires the category of object. Objects (relative beings) are significances, which are the consequence of perceptual beliefs on the part of the Subject about material or energetic objects (absolute beings) with certain characteristics.The IS (Impure System) approach is as follows: Objects are perceptual significances (relative beings) of material or energetic objects (absolute beings). The set of these objects will form an impure set of the first order. The existing relations between these relative objects will be of two classes: transactions of matter and/or energy and inferential relations. Transactions can have alethic modality: necessity, possibility, impossibility and contingency. Ontic existence of possibility entails that inferential relations have Deontic modality: obligation, permission, prohibition, faculty and analogy. We distinguished between theorems (natural laws) and norms (ethical, legislative and customary rules of conduct).
AbstractThree types of system are identified and differentiated: mechanical, organismic, and social systems. The evolution of our concept of an enterprise from mechanical to social is then traced, as enterprises are viewed from each of these perspectives. Some consequences of conceptualizing them as social systems are then discussed, including the consequences of (1) considering the parts of an enterprise separately, as is commonly done, that is, managing analytically versus synthetically; (2) supervising personnel who can do their jobs better than their bosses; (3) treating problems separately rather than systemically, and (4) taking disciplines as aspects of reality, that is, as categories of nature.
This article examines the role of a psychiatric consultant in a psy chiatric hospital undergoing a major change. The principles of group phenomenon, systems theory, sentient, task, and basic as sumption groups were utilized in diagnosis of organizational re gression, elucidation of its precipitants, and strategies for helping the organization towards higher level of integration in face of po tentially regressive changes.
