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Coexistence of various wireless access networks and the ability of mobile terminals to switch between them make an optimal selection of serving networks for multicast groups a challenging problem. Since optimal network selection requires large dimensions of data to be collected from several network locations and sent between several network components, the scalability can easily become a bottleneck in large-scale systems. Therefore, reducing data exchange within heterogeneous wireless networks is important. The paper aims to discuss these issues.

The authors study the decision-making process and the data that need to be sent between different network components. To analyze the operation of the wireless heterogeneous network, the authors built a mathematical model of the network. The objective is defined as a minimization of multicast streams in the system. To evaluate the heuristic solutions, the authors define the upper and lower bounds to their operation.

The proposed heuristic solutions substantially reduce the usage of bandwidth in mobile networks and exchange of information between the network components.

The authors proposed the approach that allows network selection in a decentralized manner with only limited information shared among the decision makers. The authors studied how different sets of information available to decision makers influenced the performance of the system. The work also investigates the usage of multiple paths for multicast in heterogeneous mobile environments.

The world stands on the threshold of a tantalizing opportunity: the possibility of a sustained economic boom over the first decades of the next millennium. This article outlines the confluence of forces – particularly the transition to a knowledge society, the emergence of a global economy and the pursuit of environmental sustainability – which could come together to propel huge improvements in wealth‐creating capacity and wellbeing world‐wide. The transition to a knowledge economy and society over the next few decades opens up the possibility of massive productivity gains. Equally significant, stimulus for a long boom could emerge from the creation of much more deeply integrated global markets for goods, services, capital and technology. Finally, the long boom could be sustained by a cooperative push to redirect the path of humanity’s relationship to the environment – a change entailing massive investments in new, less resource‐intensive patterns of consumption and methods of production. The unleashing of these dynamic forces hinges on two basic policy thrusts. First, economic dynamism in general and a long boom in particular will demand exceptional efforts – nationally and internationally – to encourage continuous innovation and high levels of investment. Second, with the prospects for a long boom contingent on the realization of a leap in the levels of international cooperation, decision makers will have to consider bold new approaches to negotiating and reconciling conflicting interests and divergent needs.

Eighty‐five participants attended the 4th ISHM Display meeting at the Jaarbeurs Congress Centre in Utrecht on 16 October, 1986. The programme of the day started with the annual general membership meeting of the Benelux Chapter. The chairman, Mr T. Kwikkers, gave a short review of the state of affairs of ISHM‐Benelux and of the activities of the last year. He mentioned the temporary enlargement of the executive committee to give a new generation a chance to gain experience in the ISHM organisation and to take up some new activities. In order to raise publicity for ISHM and Hybrid Circuits a new brochure has been designed and a set of material for demonstration purposes was collected. With the material every member of the chapter can easily set up a presentation for schools or customers. This year ISHM‐Benelux has grown from 85 to 100 members and enjoys a healthy financial situation. Next year again emphasis will be put on public relations. Professor R. Govaerts signified that he was no longer available for a position in the executive committee. As Prof. Govaerts has been very active and stimulating for the ISHM‐Benelux Chapter from its foundation in 1976 up to now, the general membership meeting decided to appoint him as (the first) honorary member of this chapter. Except for Professor Govaerts, the sitting executive committee, consisting of 15 members, was re‐elected for another year. After the European conferences in Bournemouth and Hamburg the ISHM‐Benelux chapter is asked to organise the 1991 Conference. The executive committee is already looking out for candidates for a function in the organising committee, which must be formed in the coming year.

lm allgemeinen wirtschaftlichen Sprachgebrauch versteht man unter Innovation die Markteinführung von neuen Produktionsprozessen und/oderProdukten bzw. Dienst ‐leistungen. Wrde man sich diesem Sprachgebrauch anschliessen, so würden alle institutionell‐organisatorischen, rechtlichen oder sozialen Neuerungen aus dieser Betrachtung herausfallen, obwohl feststeht, dass auch von diesen Neuerungen bedeutende Einflsse auf die Wettbewerbsfähigkeit von Betrieben, Sektoren, bzw. ganzen Volkswirtschaften ausgehen können, sei es durch die Neuerung selbst oder dadurch, dass sie die Voraussetzung fr die Nutzung von Produkt‐, Dienst‐leistungs‐ und Prozessinnovationen schaffen können. Ein Beispiel im Tourismusbereich wäre der verstärkte Einsatz von EDV und der dadurch bedingte Durchbruch des globalen Verteilungs‐ /Verbuchungs‐/Reservie‐rungssystemes. Sicherlich sind daher auch sozialrechtliche bzw. institutionell organisatorische Neuerungen als Innovation aufzufassen. Gerade auf diesem Gebiet scheint es in der österreichischen Landschaft der erstarrten, z.T. oft noch mittelalterlich anmutenden Normen, Institutionen und Gesetze einigen Aufholbedarf gegenüber dem Ausland zu geben.