| 41. |
- Berglund, Pierre, et al.
(författare)
-
Dynamic Characteristics of Exhaust System Hangers
- 1999
-
Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- Comfort in automobiles is greatly affected by vibrations and noise transmitted to the chassis from the engine. This is a study of the dynamic characteristics of exhaust system hangers, which is an important transfer path for vibrations. Theoretical and experimental modal analysis is used to suggest design parameters that increase the natural frequencies to above 450 Hz for two hanger types.
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| 42. |
- Birgersson, Tommy, et al.
(författare)
-
Vem bestämmer : om medborgarinflytande och kommunal planering. Erfarenheter från Sydlänsprojektet.
- 1998
-
Bok (övrigt vetenskapligt/konstnärligt)abstract
- Boverket och Folkrörelserådet Hela Sverige ska leva tog 1995 initiativ till Sydlänsprojektet. Syftet var att finna former för hur lokalt utvecklingsarbete kan få bättre stöd av kommunal planering men också hur medborgarinflytandet kan komma till tydligare uttryck. Denna rapport redovisar resultatet från utvärderingen av Sydlänsprojektet. Den innehåller iakttagelser och relexioner kring de processer som har ägt rum mellan nio kommuner och lika många lokala utvecklingsarbeten i deras försök att förbättra medborgarinflytandet i kommunal planering. Rapporten vänder sig till de personer som har varit involverade i Sydlänsprojektet men också till andra kommuner och grupper av medborgare som står i beredskap att starta eller befinner sig mitt i ett liknande arbete. Slutsatserna från utvärderingen och de förslag som presenteras bör även kunna tjäna som underlag för en allmän diskussion om hur medborgarnas delaktighet i samhällsplaneringen ska kunna förbättras. Det kan gälla förändringsarbte i såväl mindre samhällen som storskaliga bostadsområden. Erfarenheter från Sydlänsprojektet kan dessutom vara nyttiga för de personer som arbetar med att genomföra FN-initiativen Agenda 21 och Habitatagendan.
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| 43. |
- Björklund, Svante, et al.
(författare)
-
Radar-Like Measurements with an Experimental Digital Beamforming Array Antenna
- 1998
-
Konferensbidrag (refereegranskat)abstract
- An experimental S-band digital beamforming receiving array antenna has been used in “radar- like” measurements, where radar signals with programmable waveforms are transmitted. The measurements are carried out in an anechoic chamber and the measured signals come from the direct path from transmitter antennas to the receiver antenna. In this way targets are simulated. On the received signals, conventional beamforming, pulse compression, doppler filtering and high resolution direction of arrival estimation are performed. Accurate channel calibration and channel equalization are utilized. This paper first describes the receiving antenna, transmitter control, measurement arrangements, calibration and signal processing. It then presents some measurement results for high resolution direction of arrival estimation and for radar resolution of one and two targets.
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| 44. |
- Blomberg, Jeanette, et al.
(författare)
-
Participatory Design : Issues and Concerns
- 1998
-
Ingår i: Computer Supported Cooperative Work. - : Springer. - 0925-9724 .- 1573-7551. ; 7:3-4, s. 167-185
-
Tidskriftsartikel (refereegranskat)
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| 45. |
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| 46. |
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| 47. |
- Bosch, Jan
(författare)
-
A Model for a Flexible and Predictable Object-Oriented Real-Time System
- 1996
-
Rapport (övrigt vetenskapligt/konstnärligt)abstract
- The requirements on real-time systems are changing. Traditionally, reliability and predictability of, especially hard, real-time systems were the main requirements. This lead to systems that were stand-alone, embedded and static. Future real-time systems, but also current systems, still require reliability and predictability, but also distribution of the real-time system, integration with non real-time systems and the ability to dynamically change the components of the system at runtime. Traditional approaches to real-time system development have difficulties in addressing these additional requirements. Therefore, new ways of constructing real-time systems have to be explored. In this article, we develop a real-time object-oriented model that facilitates the requirements of flexibility without sacrificing the predictability, integration and dynamicity aspects.
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| 48. |
- Bosch, Jan, et al.
(författare)
-
A Model for a Flexible and Predictable Object-Oriented Real-Time System
- 1997
-
Konferensbidrag (refereegranskat)abstract
- The requirements on real-time systems are changing. Traditionally, reliability and predictability of hard, real-time systems in particular were the main requirements. This lead to systems that were stand-alone, embedded and static. Future real-time systems, but even current systems, still require reliability and predictability, but also distribution of the real-time system, integration with non real-time systems and the ability to change dynamically the components of the system at run-time. Traditional approaches to real-time system development have difficulty in addressing these additional requirements. New ways of constructing real-time systems must therefore be explored. In this article, we develop a real-time object-oriented model that facilitates the requirements of flexibility without sacrificing the predictability, integration and dynamicity aspects.
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| 49. |
- Bosch, Jan
(författare)
-
Abstract Object State in Real-Time Control
- 1995
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Traditionally, finite state machines based approaches are used in real-time object-oriented systems development for modelling the dynamic behaviour of an object. Finite state machines based approaches, however, suffer from several problems when used for modelling large and complex objects. As an alternative, an extended object model, LayOM, and an associated modelling approach is proposed aiming to solve the aforementioned problems and other problems related to object state.
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| 50. |
- Bosch, Jan
(författare)
-
Abstracting object state
- 1997
-
Ingår i: OBJECT ORIENTED SYSTEMS. - LONDON : CHAPMAN HALL LTD. - 0969-9767. ; , s. 1-&
-
Tidskriftsartikel (refereegranskat)abstract
- The term `state' has many different meanings, depending on the context in which it is used. In the implementation phase, it refers to the values of the instance variables of the object; during design, it refers to states used in finite state models or their derivatives. For both interpretations, problems have been identified: (1) the way clients of an object access its state is defined in an ad hoc manner, (2) the conventional object-oriented model provides no means to change the interface of an object dynamically on the basis its state or the type of client accessing it, (3) finite state machine approaches are not uniformly integrated in the object-oriented model nor do they provide sufficient complexity reduction for modelling the dynamic behaviour, and (4) no support is provided for defining active states. In this paper we introduce the concept of abstract object state as a solution to these problems. This concept provides a systematic technique to explicitly define an abstraction of the object state which is placed at the interface of the object. The abstract object state consists of static states, but also of active states which can be seen as time derivatives of static states. We show that the abstract object state provides a more uniform approach to object behaviour specification than do finite state models. The concepts discussed have been implemented in the layered object model ((LOM)-O-AY), an extended object-oriented model which is supported by a translator to C++, an execution environment and an integrated development environment.
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