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  • 121251.
    Öberg, Helena
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Brinck, Tore
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Fragment molecular orbital study of the cAMP-dependent protein kinase catalyzed phosphoryl transfer: a comparison with the differential transition state stabilization method2016In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 18, no 22, p. 15153-15161Article in journal (Refereed)
    Abstract [en]

    The importance of key residues to the activity of the cAMP-dependent protein kinase catalyzed phosphoryl transfer and to the stabilization of the transition state of the reaction has been investigated by means of the fragment molecular orbital (FMO) method. To evaluate the accuracy of the method and its capability of fragmenting covalent bonds, we have compared stabilization energies due to the interactions between individual residues and the reaction center to results obtained with the differential transition state stabilization method (Szarek, et al., J. Phys. Chem. B, 2008, 112, 11819-11826) and observe, despite a size difference in the fragment describing the reaction center, near-quantitative agreement. We have also computed deletion energies to investigate the effect of virtual deletion of key residues on the activation energy. These results are consistent with the stabilization energies and yield additional information as they clearly capture the effect of secondary interactions, i. e. interactions in the second coordination layer of the reaction center. We find that using FMO to calculate deletion energies is a powerful and time efficient approach to analyze the importance of key residues to the activity of an enzyme catalyzed reaction.

  • 121252. Öberg, J.
    et al.
    Andersson, Evert
    Determining the deterioration cost for railway tracks2009In: Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit, ISSN 0954-4097, E-ISSN 2041-3017, Vol. 223, no 2, p. 121-129Article in journal (Refereed)
    Abstract [en]

    The cost of maintaining and renewing railway tracks affected by traffic-dependent deterioration is considerable. It is important not only to have proper maintenance regimes, but also to have knowledge of the interaction between vehicles and track in order to reduce the deterioration of both. In a joint project between Banverket (Swedish Rail Administration) and KTH (Royal Institute of Technology, Stockholm), a model for track deterioration is developed, considering track settlement, component fatigue, abrasive wear, and rolling contact fatigue of rails. The basis of the model is taken from what is considered as state-of-the-art knowledge. The model is used as a basis for a proposed new track access charging regime for Banverket, able to differ between vehicle types based on their characteristics and tendency to deteriorate the tracks. The model is implemented in an Excel (R) environment and applied to Swedish mainline traffic and vehicles. Using representative vehicle characteristics in determining track deterioration, it is predicted that there are large differences between different vehicles regarding their deterioration of the tracks. The model predicts axle load, unsprung mass, and wheelset steering capability as decisive for track deterioration. The model is believed to predict realistic results also for heavy-haul rail operations.

  • 121253. Öberg, J.
    et al.
    Ellervee, P.
    Mokhtari, M.
    Jantsch, A.
    KTH, School of Information and Communication Technology (ICT), Electronic Systems.
    Design of a 1 GIPS Peak Performance Processor using GaAs Technology1994In: Proceedings of the IEEE NORCHIP Conference, 1994Conference paper (Refereed)
  • 121254. Öberg, J.
    et al.
    Isoaho, J.
    Ellervee, P.
    Jantsch, A.
    KTH, School of Information and Communication Technology (ICT), Electronic Systems.
    Hemani, A.
    BABBAGE - A Rule based Tool for Synthesis of Hardware Systems1994In: Proceedings of the IEEE NORCHIP Conference, 1994Conference paper (Refereed)
  • 121255.
    ÖBERG, JENNY
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Industrial Economics and Management (Dept.), Industrial Management.
    STENLÖF, ELIN
    KTH, School of Industrial Engineering and Management (ITM), Industrial Economics and Management (Dept.), Industrial Management.
    What role to play in strategy implementation?: Constructive interplay between middle and frontline managers2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Purpose: The purpose of this research was to study the interplay between middle managers (MMs) and front-line managers (FLMs) in strategy implementation (SI). To successfully manage and run a complex technology corporation a well-performed strategy is essential. By comparing MMs’ and FLMs’ different views and responsibilities in the SI process, both theoretical and empirical. Methodology: Theoretical material regarding leadership, middle and front-line manager roles and responsibilities, as well the strategy implementation process, obstacles and success factors are compared in the study. Supplemented by a general pilot study and primary interviews covering their view of the SI-process, obstacles and leverages, leadership, and their roles description. In total, ten pilot interviews and 12 primary interviews have been conducted, with MMs and FLMs, equally represented. Findings: In large, the main findings regarding the creation of a dynamic interplay between MMs and FLMs were three identified key attributes. Firstly, success in the SI process and constructive dynamic require a clear distribution of tasks and responsibilities between MMs and FLMs or the key responsibilities in the process. Secondly, select key people for the SI process, picked from different levels in the organization with different viewpoint and expertise. Making sure that there are total transparency and knowledge sharing between all key members and organizational levels. This will enable a greater involvement and commitment in the SI-process. Finally, to create a successful SI-process and a dynamic interplay between MMs and FLMs, strategic work must be rewarded equally compared to operational excellence and product-development efforts.

  • 121256.
    ÖBERG, JOAKIM
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    GHAZI, SAREM
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Värdeflödesanalys av en produktionsverkstad2013Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
  • 121257.
    Öberg, Johan
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology and Design.
    Wiege, Erik
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology and Design.
    Moisture risks with CLT-panels subjected to outdoor climate during construction: focus on mould and wetting processes2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    When going through relevant research, moisture safety guidelines and talking to builders, moisture experts and architects it is clear - and not surprising - that water and wood make no easy combination. The experiences from building with cross laminated timber (CLT) differ from building sites and there are good and bad examples building without weather protection.

    In this study the moisture influence on CLT is analyzed. CLT is a type of massive wood with glued lamellas, increasing usage worldwide as structural elements in buildings. The bulk of the work is performed in the hygrothermal calculation tool WUFI(™). Focus is on the wetting process and the evaluation of mould risk from rain loads during production in Nordic climates. Subsequent drying after built into walls and floors is also evaluated.

    A vast literature survey is performed in order to compare and select material data for modelling CLT. Following the simulation work, moisture content, mould growth and volumetric distortion are judged both with and without weather protection. Results are also compared to measurement data from field tests.

    It is found that short building times are crucial, some weather protection is required all year around and early planning and constructing for moisture safety are crucial. The benefits of prefabrication and short building times using CLT should be exploited. If there is a risk of rainfall exceeding 10-20 mm, arrangements to divert rain loads should be undertaken. If the expected rain loads are above 40 mm or if the building time exceeds 2 weeks, a roof cover will be required. At air humidities averaging 80% and yearly rain exceeding 1200 mm, a complete building cover is recommended. A controlled environment may be expensive, but it speeds up production and shortens drying time.

  • 121258.
    Öberg, John
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology and Design.
    Ståhlfors, Andreas
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology and Design.
    Materialegenskaper och dimensioneringsmetodik för vattenledningar: En sammanställning av de material som förekommer i Norrvattens ledningsnät samt dimensioneringsverktyg för plastledningar2012Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis has been conducted in response to a request by Norrvatten for an objective report concerning the materials used in their water supply infrastructure, with a focus on the typical damages linked to specific materials or manufacturing processes. Through interviews with well-informed experts we have received indications that the knowledge regarding the materials used in Norrvatten’s water pipes and said materials’ properties have declined over time, as the older generation of construction planners have left behind a knowledge gap.

    The purpose of the report is to give a good insight into the materials used in Norrvatten’s water supply infrastructure (specifically the pipes used). We claim that a knowledge of the materials used is necessary to analyze the correlation between leakage statistics and the properties of the materials used in the infrastructure.

    The level of information available varies between the different materials. This is mainly caused by the structure of the material and the difficulty in depicting a clear and objective picture of it. The materials and their information are divided into separate chapters to make it easier for the reader to understand the picture we are trying to create.

    Another important chapter in this report is the description of the methods of installation we have chosen to work with; these methods are buried pipelines but also two trenchless methods which are lining and pipe bursting. In reality many more methods that the ones described here exist, but many methods are similar and the ones presented here are those that are most commonly used. This chapter is directly linked to our dimensioning model for pipe replacements concerning strength in regard to earth pressure and traffic load, but also the tensile that occur primarily in the trenchless methods. The dimensionality model is constructed as an Excel document where the user – through utilizing some basic parameters – fills out the document and automatically receives results regarding whether or not the new pipes will withstand the stress it is exposed to.

    Based on the correlation between damage statistics and the use of different materials in the pipe infrastructure we attempt to provide an accurate picture of which materials we deem to be, generally speaking, the most appropriate to make use of.

     

  • 121259.
    Öberg, Johnny
    KTH, Superseded Departments, Electronic Systems Design.
    An Adaptable Environment for Improved High-Level Synthesis1996Licentiate thesis, monograph (Other academic)
  • 121260. Öberg, Johnny
    BABBAGE - A Rule-Based Tool for Synthesis of Hardware Systems1994In: Proceedings of NUTEK programkonferens Ramprogrammet Inbyggda System, 1994, p. 53-61Conference paper (Other academic)
  • 121261.
    Öberg, Johnny
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Clocking Strategies for Networks-on-Chip2003In: Networks-on-Chip / [ed] Axel Jantsch, Kluwer Academic Publishers, 2003, p. 153-172Chapter in book (Refereed)
  • 121262. Öberg, Johnny
    Espresso-based Estimation Methods in the ProGram Compiler1999Report (Other academic)
  • 121263.
    Öberg, Johnny
    KTH, Superseded Departments, Electronic Systems Design.
    ProGram: a grammar-based method for specification and hardware synthesis of communication protocols1999Doctoral thesis, comprehensive summary (Other scientific)
  • 121264. Öberg, Johnny
    SpaceBall-1G: Pipelined 1 GHz Cache Memories in GaAs1995Report (Other academic)
  • 121265.
    Öberg, Johnny
    KTH, School of Information and Communication Technology (ICT), Electronics.
    Synthesis of VLIW accelerators from formal descriptions in a real-time multi-core environment2017In: 14th FPGAworld Conference, FPGAworld 2017 - Academic Proceedings 2017, Association for Computing Machinery (ACM), 2017, p. 23-29Conference paper (Refereed)
    Abstract [en]

    Designing, programming and design space exploration of predictable Real-Time systems on Heterogeneous Multi-Core platforms is a very complex task. The increasing validation costs and time-to-market pressure creates a desire to build systems that are correct by construction. Formal description based on Model of Computations (MoCs) is a convenient way to create high-level models of such systems. The MoCs provide abstraction and high level modeling through a clear set of rules based on mathematics, which can be used as input for system synthesis. A formal synthesis flow would then ensure that the resulting real-time system is both predictable and correct by construction, provided that all transformations used in the flow can be verified/trusted. In this paper we show how a Real-Time computation node in an MPSoC system, described using the Synchronous MoC, can be transformed into a VLIW accelerator. The created accelerator is incorporated as a computation node in a heterogeneous multi-core system implemented on an FPGA.

  • 121266.
    Öberg, Johnny
    KTH, Superseded Departments, Alfvén Laboratory.
    Tuning of JET Transmission Line/Antenna System During ICRH1993Independent thesis Advanced level (degree of Master (Two Years)), 12 credits / 18 HE creditsStudent thesis
  • 121267.
    Öberg, Johnny
    et al.
    KTH, Superseded Departments, Electronic Systems Design.
    Düring, Morgan
    Millberg, Mikael
    Evaluating the Efficacy of utilizing a Protocol Grammar for Modeling of a Processor Architecture: A Case Study2002In: Proceedings of NORCHIP, 2002, p. 309-315Conference paper (Refereed)
  • 121268.
    Öberg, Johnny
    et al.
    KTH, Superseded Departments, Electronic Systems Design.
    Eles, Petru
    Linköpings Tekniska Högskola.
    Hemani, Ahmed
    KTH, Superseded Departments, Electronic Systems Design.
    Kuchcinski, Krzystof
    Linköpings Tekniska Högskola.
    Peng, Zebo
    Linköpings Tekniska Högskola.
    Specifying Local Timing Constraints for HLS Pur­pose1994Report (Other academic)
  • 121269.
    Öberg, Johnny
    et al.
    KTH, Superseded Departments, Electronic Systems Design.
    Eles, Petru
    Linköpings Tekniska Högskola.
    Hemani, Ahmed
    KTH, Superseded Departments, Electronic Systems Design.
    Kuchcinski, Krzystof
    Linköpings Tekniska Högskola.
    Peng, Zebo
    Linköpings Tekniska Högskola.
    Specifying Local Timing Constraints in VHDL for HLS of Digital Systems1995In: Proceedings of the 6th Swedish Workshop on Copmuter System Architecture, 1995Conference paper (Refereed)
  • 121270.
    Öberg, Johnny
    et al.
    KTH, Superseded Departments, Electronic Systems Design.
    Eles, Petru
    Linköpings Tekniska Högskola.
    Hemani, Ahmed
    KTH, Superseded Departments, Electronic Systems Design.
    Kuchcinski, Krzysztof
    Linköpings Tekniska Högskola.
    Peng, Zebo
    Linköpings Tekniska Högskola.
    Specifying Local Timing Constraints for HLS of Dig­ital Systems in VHDL1996In: Proceedings of APCHDL, 1996, p. 145-149Conference paper (Refereed)
  • 121271.
    Öberg, Johnny
    et al.
    KTH, Superseded Departments, Electronic Systems Design.
    Ellervee, Johnny
    Revolver: A high-performance MIMD architecture for collision free computing1998Conference paper (Refereed)
  • 121272.
    Öberg, Johnny
    et al.
    KTH, Superseded Departments, Electronic Systems Design.
    Ellervee, Peeter
    Transition graph representation of FSM and its application to state minimization in the ProGram compiler1998Report (Other academic)
  • 121273.
    Öberg, Johnny
    et al.
    KTH, Superseded Departments, Electronic Systems Design.
    Ellervee, Peeter
    Hemani, Ahmed
    Grammar-based Modelling of Clock Protocols for Low Power Implemen­tations: A Case Study1998Conference paper (Refereed)
  • 121274.
    Öberg, Johnny
    et al.
    KTH, Superseded Departments, Electronic Systems Design.
    Ellervee, Peeter
    Jantsch, Axel
    Using the Revolver Architecture for Data Processing in Heterogeneous Systems2001Report (Other academic)
  • 121275.
    Öberg, Johnny
    et al.
    KTH, Superseded Departments, Electronic Systems Design.
    Ellervee, Peeter
    KTH, Superseded Departments, Electronic Systems Design.
    Jantsch, Axel
    KTH, Superseded Departments, Electronic Systems Design.
    Hemani, Ahmed
    KTH, Superseded Departments, Electronic Systems Design.
    BABBAGE - A Rule basedtool for synthesis of hardware systems1994In: Proc. of IEEE NORCHIP’94, 1994Conference paper (Refereed)
  • 121276.
    Öberg, Johnny
    et al.
    KTH, Superseded Departments, Electronic Systems Design.
    Ellervee, Peeter
    KTH, Superseded Departments, Electronic Systems Design.
    Kumar, Anshul
    KTH, Superseded Departments, Electronic Systems Design.
    Hemani, Ahmed
    KTH, Superseded Departments, Electronic Systems Design.
    Comparing Conventional HLS with Grammar-Based Hardware Synthesis: A Case Study1997In: Proc. of IEEE NORCHIP, 1997Conference paper (Refereed)
  • 121277.
    Öberg, Johnny
    et al.
    KTH, School of Information and Communication Technology (ICT), Electronic Systems.
    Ellervee, Peeter
    Kumar, Anshul
    Hemani, Ahmed
    Comparing Conventional HLS with Grammar-Based Hardware Synthesis: A Case Study1997Conference paper (Refereed)
  • 121278.
    Öberg, Johnny
    et al.
    KTH, Superseded Departments, Electronic Systems Design.
    Ellervee, Peeter
    Mokhtari, Mehran
    Jantsch, Axel
    SpaceBall-1G: A 32-bit 1 GIPS Peak Performance MIMD CPU Targeted for GaAs1995Report (Other academic)
  • 121279.
    Öberg, Johnny
    et al.
    KTH, Superseded Departments, Electrical Systems.
    Ellervee, Peeter
    Mokhtari, Mehran
    Jantsch, Axel
    KTH, Superseded Departments, Electrical Systems.
    Hemani, Ahmed
    A 1 GIPS Peak Performance Multi-Threaded Processor Core Using Interleaved Processing And A Revolving register File Targeted for GaAs1995Conference paper (Refereed)
  • 121280.
    Öberg, Johnny
    et al.
    KTH, Superseded Departments, Electronic Systems Design.
    Isoaho, Jouni
    Tampere University of Technology, Signal Processing Laboratory.
    Ellervee, Peeter
    KTH, Superseded Departments, Electronic Systems Design.
    Jantsch, Axel
    KTH, Superseded Departments, Electronic Systems Design.
    Hemani, Ahmed
    KTH, School of Information and Communication Technology (ICT), Electronic Systems.
    A rule-based approach for improving allocation of filter structures in HLS1996In: Ninth International Conference on VLSI Design, 1996. Proceedings, IEEE conference proceedings, 1996, p. 133-139Conference paper (Refereed)
    Abstract [en]

    A rule based allocator for improving synthesis of filter systems is presented. The principles of the Enhanced AIlocation Rule Language Interpreter (EARLI) are presented. Possible transformations, optimisations and how to express them in EARLI are discussed. Experiments show that relative area gains ranging from 5 to 44%, depending on the chosen target technology, can be achieved using the designers knowledge about the design class. Experiments also indicate that employing direct mapping of CDFG subgraphs onto preoptimised RTL-level macroblocks would have resulted in a relative area gain of 500%. The macroblock had only 16% of the area produced by the HLS-tool

  • 121281.
    Öberg, Johnny
    et al.
    KTH, Superseded Departments, Electronic Systems Design.
    Jantsch, Axel
    Orthogonal High-Level Synthesis from Grammar-based Specifications2001Report (Other academic)
  • 121282.
    Öberg, Johnny
    et al.
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Kumar, A
    Hemani, Ahmed
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Grammar-based hardware synthesis from port-size independent specifications2000In: IEEE Transactions on Very Large Scale Integration (vlsi) Systems, ISSN 1063-8210, E-ISSN 1557-9999, Vol. 8, no 2, p. 184-194Article in journal (Refereed)
    Abstract [en]

    A protocol defines how systems communicate, There are two ways of specifying the protocol, the language of communication, One way is to specify the automaton that recognizes the language, and this is the approach taken by SDL, etc. The other more abstract way is to specify the grammar of the language and let a tool synthesize the automaton, Directly specifying the automaton makes the specification implementation dependent in two ways: the time behavior is specified in terms of states, and the width of the inputs and outputs is fixed, By specifying the grammar, the specification is potentially independent of both these implementation details and allows design space exploration in these dimensions. This paper presents a grammar-based language, called ProGram, that supports a port-size independent specifications methodology and its application to parts of the Operation and Maintenance protocol, a typical application from the ATM world. The methodology has also been applied to another test set of example designs and compared to standard RTL synthesis and HLS in order to evaluate the quality of the produced designs.

  • 121283.
    Öberg, Johnny
    et al.
    KTH, Superseded Departments, Electronic Systems Design.
    Kumar, Anshul
    Hemani, Ahmed
    Enhanced Synthesis Strategies to cope with Exception Handling in Pro­Gram1998Report (Other academic)
  • 121284.
    Öberg, Johnny
    et al.
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Kumar, Anshul
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Hemani, Ahmed
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Grammar-based hardware synthesis from port-size independent specifications2000In: IEEE Transactions on Very Large Scale Integration (vlsi) Systems, ISSN 1063-8210, E-ISSN 1557-9999, Vol. 8, p. 184-194Article in journal (Refereed)
    Abstract [en]

    A protocol defines how systems communicate. There are two ways of specifying the protocol, the language of communication. One way is to specify the automaton that recognizes the language, and this is the approach taken by SDL, etc. The other more abstract way ss to specify the grammar of the language and let a tool synthesize the automaton. Directly specifying the automaton makes the specification implementation dependent in two ways: the time behavior is specified in terms of states, and the width of the inputs and outputs is fixed. By specifying the grammar, the specification is potentially independent of both these implementation details and allows design space exploration in these dimensions. This paper presents a grammar-based language, called Program, that supports a port-size independent specifications methodology and its application to parts of the Operation and Maintenance protocol, a typical application from the ATM world. The methodology has also been applied to another test set of example designs and compared to standard RTL synthesis and HLS in order to evaluate the quality of the produced designs.

  • 121285.
    Öberg, Johnny
    et al.
    KTH, Superseded Departments, Electronic Systems Design.
    Kumar, Anshul
    KTH, Superseded Departments, Electronic Systems Design.
    Hemani, Ahmed
    KTH, Superseded Departments, Electronic Systems Design.
    Grammar-based hardware synthesis of data communication protocols1996In: System Synthesis, 1996. Proceedings., 9th International Symposium on, 1996, p. 14-19Conference paper (Refereed)
    Abstract [en]

    For a synthesis methodology to support implementation independent design specification, a capability for design space exploration is essential. In this paper we present such a methodology for a specific domain: data communication protocols. A natural way to specify various elements of protocols is in terms of a grammar annotated with actions. Our language for protocol specification, called PRO-GRAM, is based on this idea. The hardware specification of the protocol is done by specifying the bit-patterns of the tokens the protocol is supposed to parse together with the actual grammar to parse the input stream. By specifying constraints on the input and output stream ports, the designer is allowed to explore alternative realisations with different widths of the I/O ports. The PRO-GRAM compiler outputs VHDL-code suitable for logic synthesis

  • 121286.
    Öberg, Johnny
    et al.
    KTH, School of Information and Communication Technology (ICT), Electronic Systems.
    Kumar, Anshul
    KTH, Superseded Departments, Electronic Systems Design.
    Hemani, Ahmed
    KTH, Superseded Departments, Electronic Systems Design.
    Scheduling of outputs in grammar-based hardware synthesis of data communication protocols1998In: Design, Automation and Test in Europe, 1998., Proceedings, 1998, p. 596-603Conference paper (Refereed)
    Abstract [en]

    We present a grammar based specification method for hardware synthesis of data communication protocols in which the specification is independent of the port size. Instead, it is used during the synthesis process as a constraint. When the width of the output assignments exceed the chosen output port width, the assignments are split and scheduled over the available states. We present a solution to this problem and results of applying it to some relevant problems

  • 121287.
    Öberg, Johnny
    et al.
    KTH, School of Information and Communication Technology (ICT), Electronic Systems.
    Kumar, Anshul
    KTH, School of Information and Communication Technology (ICT), Electronic Systems.
    Hemani, Ahmed
    KTH, School of Information and Communication Technology (ICT), Electronic Systems.
    Specification of exception handling in grammar-based hardware synthesis1998In: Euromicro Conference, 1998. Proceedings. 24th, 1998, Vol. 1, p. 38-41Conference paper (Refereed)
    Abstract [en]

    ProGram is our in-house grammar based specification language targeted to specification of protocols, interfaces and control dominated functionality. The Program compiler implements such specifications in hardware. Specification of exception handling functionality and its automatic implementation are key requirements for a robust design methodology. In this paper, we present extensions to the ProGram language for specification of a wide range of exception handling functionality: reset to deal with exception handling needs of global nature, interrupt for representing exception handling on a hierarchical basis and error sequences to handle situations when inputs are not according to the specified grammar

  • 121288.
    Öberg, Johnny
    et al.
    KTH, Superseded Departments, Electronic Systems Design.
    Kumar, Anshul
    Hemani, Ahmed
    Synthesis of Exception Handling in Grammar-based Hardware Synthesis1998In: Proceedings of APCHDL-98, 1998, p. 135-140Conference paper (Refereed)
  • 121289.
    Öberg, Johnny
    et al.
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Kumar, Anshul
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Hemani, Ahmed
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Kumar, Shashi
    Indian Institute of Technology.
    Specification and Synthesis of Exception Handling in Grammar-based Hardware Synthesis1998In: Journal of Electrical Engineering and Information Science, Korea, Vol. 3, no 6, p. 724-735Article in journal (Refereed)
  • 121290.
    Öberg, Johnny
    et al.
    KTH, Superseded Departments, Electronic Systems Design.
    Kumar, Anshul
    Jantsch, Axel
    KTH, Superseded Departments, Electronic Systems Design.
    An Object-Oriented Concept for Intelligent Library Functions1998In: Proceedings of the Eleventh International Conference on VLSI Design, 1998Conference paper (Refereed)
  • 121291.
    Öberg, Johnny
    et al.
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
    Mellander, Roger
    ABB Research.
    Zahrai, Said
    ABB Research.
    The ABB NoC: A Deflective Routing 2x2 Mesh NoC targeted for Xilinx FPGAs2008In: Proceedings of FPGAWorld 2008, 2008Conference paper (Refereed)
  • 121292.
    Öberg, Johnny
    et al.
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    O'Nils, M
    Jantsch, Axel
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Postula, A
    Hemani, Ahmed
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Grammar-based design of embedded systems2001In: Journal of systems architecture, ISSN 1383-7621, E-ISSN 1873-6165, Vol. 47, no 3-4, p. 225-240Article in journal (Refereed)
    Abstract [en]

    Grammars define syntax of languages and as such have not been commonly considered as methods for design, despite well-known applications in computer science. Only in recent years grammar-based design has become a promising research field and the first commercial tools have appeared on the market. This paper reviews the basic concepts of applying grammars to electronic design - in particular to the device driver synthesis of communication protocols for embedded software, to the design of custom-hardware, and to the virtual prototyping of DSP systems. The paper shows the power of these methods, presents the latest research results and discusses future developments in this field.

  • 121293.
    Öberg, Johnny
    et al.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Plosila, Juha
    Ellervee, Peeter
    Automatic synthesis of asynchronous circuits from synchronous RTL descriptions2005In: Norchip 2005, Proceedings, 2005, p. 200-205Conference paper (Refereed)
    Abstract [en]

    As the dimensions of ASICs shrink down to the nanometer regime, the variability of the process parameters will increase. This variability threatens to make it extremely difficult to distribute a synchronous clock. all over the chip. Another option would be to replace critical synchronous parts with asynchronous counterparts with the same functionality. The main problems are, first, there is no established tool-flow that makes it easy for a designer to design an asynchronous circuits, and, second, there are no established design automation tools, except a few experimental ones. In addition, most designers today are trained to design synchronous circuits and have to be retrained. In this paper we present a method that solves all three of these problems, i.e., it allows a designer to start in the synchronous domain, and then automatically transform the synchronous representation of the circuit into an asynchronous one.

  • 121294.
    Öberg, Johnny
    et al.
    KTH, School of Information and Communication Technology (ICT), Electronic Systems.
    Robino, Francesco
    KTH, School of Information and Communication Technology (ICT), Electronic Systems.
    A NoC Generator for the Sea-of-Cores Era2011In: Proceedings of FPGAWorld 2011, 2011Conference paper (Refereed)
  • 121295.
    Öberg, Johnny
    et al.
    KTH, School of Information and Communication Technology (ICT), Electronic Systems.
    Robino, Francesco
    KTH, School of Information and Communication Technology (ICT), Electronic Systems.
    A NoC system generator for the Sea-of-Cores era2011In: 8th FPGAworld Conference - Academic Proceedings 2011, 2011, p. 35-40Conference paper (Refereed)
    Abstract [en]

    Multi-core systems are getting bigger. The number of cores is doubling every 18 months, in corollary with the reformulated Moore's law. Soon, the number of cores that can be integrated together in a system will be so large, that it is appropriate to talk about a new SoC design paradigm, the Sea-of-Cores era. This development will not end, even when CMOS cannot be made any smaller. Instead, with the development of Through-Silicon Vias (TSVs), chips will be stacked in 3D, promising continuous scaling for a very long time ahead. As systems grow, programming and debugging of them will become harder. Methods for generating the systems from higher-level specifications will be necessary to manage design complexity. Also, there will be so many processors to be programmed, that the SW also will have to be automatically generated and distributed, much in the same way as a synthesis and place & route tool is doing today for HW. In this paper, we present a NoC generator that can generate an arbitrarily large Multi-core platform from an XML configuration file, targeted for single-chip FPGA platforms. The NoC generator also generates a device driver prototype together with a small test program that can be used as a template for creating larger programs.

  • 121296.
    Öberg, Kim
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Coating Technology.
    Hed, Yvonne
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Coating Technology.
    Joelsson Rahmn, Isabella
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Coating Technology.
    Kelly, Jonathan
    Löwenhielm, Peter
    Malkoch, Michael
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Coating Technology.
    Dual-purpose PEG scaffolds for the preparation of soft and biofunctional hydrogels: the convergence between CuAAC and thiol-ene reactions2013In: Chemical Communications, ISSN 1359-7345, E-ISSN 1364-548X, Vol. 49, no 62, p. 6938-6940Article in journal (Refereed)
    Abstract [en]

    Orthogonally functionalized PEGs displaying alkenes and azides have been prepared and their dual-purpose scaffolding potential was exploited via click chemistry for controlled insertion of bio-relevant moieties as well as facile fabrication of soft, non-toxic and degradable hydrogels.

  • 121297.
    Öberg, Kim
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Coating Technology.
    Ropponen, Jarmo
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Coating Technology.
    Kelly, Jonathan
    Löwenhielm, Peter
    Berglin, Mattias
    Malkoch, Michael
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Coating Technology.
    Templating Gold Surfaces with Function: A Self-Assembled Dendritic Monolayer Methodology Based on Monodisperse Polyester Scaffolds2013In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 29, no 1, p. 456-465Article in journal (Refereed)
    Abstract [en]

    The antibiotic resistance developed among several pathogenic bacterial strains has spurred interest in understanding bacterial adhesion down to a molecular level. Consequently, analytical methods that rely on bioactive and multivalent sensor surfaces are sought to detect and suppress infections. To deliver functional sensor surfaces with an optimized degree of molecular packaging, we explore a library of compact and monodisperse dendritic scaffolds based on the nontoxic 2,2-bis(methylol)propionic acid (bis-MPA). A self-assembled dendritic monolayer (SADM) methodology to gold surfaces capitalizes on the design of aqueous soluble dendritic structures that bear sulfur-containing core functionalities. The nature of sulfur (either disulfide or thiol), the size of the dendritic framework (generation 1-3), the distance between the sulfur and the dendritic wedge (4 or 14 angstrom), and the type of functional end group (hydroxyl or mannose) were key structural elements that were identified to affect the packaging densities assembled on the surfaces. Both surface plasmon resonance (SPR) and resonance-enhanced surface impedance (RESI) experiments revealed rapid formation of homogenously covered SADMs on gold surfaces. The array of dendritic structures enabled the fabrication of functional gold surfaces displaying molecular covering densities of 0.33-2.2 molecules.nm(-2) and functional availability of 0.95-5.5 groups.nm(-2). The cell scavenging ability of these sensor surfaces for Escherichia coli MS7fim+ bacteria revealed 2.5 times enhanced recognition for G3-mannosylated surfaces when compared to G3-hydroxylated SADM surfaces. This promising methodology delivers functional gold sensor surfaces and represents a facile route for probing surface interactions between multivalently presented motifs and cells in a controlled surface setting.

  • 121298.
    Öberg, Kim
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
    Simonsson, Johanna
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
    System design choices in smartautonomous networked irrigation systems2014Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Wireless Sensor Networks are often deployed in great numbers spanning large,

    sometimes hard to reach and hostile, areas with the aim of monitoring environmental

    conditions through the use of different sensors. Due to decreasing costs of ownership

    (e.g. non-proprietary protocols), recent advances in processor, radio, and memory

    technologies and the engineering of increasingly smaller sensing devices, the

    availability and area of application for wireless sensor networks have steadily been

    increasing.

    Sigma Technology Development Stockholm AB raised the question as to whether a

    wireless sensor network, running an open-source operating system and communicating

    over IPv6, could be used in the field of smart autonomous irrigation? The company also

    required a proof-of-concept system for demonstration purposes and to identify if the

    design choices made were suitable for an actual implementation.

    There are numerous of design decisions that have to be made when constructing an

    irrigation system: the back-end set-up, which irrigation algorithms to use, what hardware

    to choose and how to communicate? This thesis therefore focuses on the overall

    system design of a wireless sensor network in the field of irrigation and highlights the

    trade-offs being made and their pros and cons.

    Two improvements related to the existing technology and the proof-of-concept system

    are presented in this thesis. Firstly, the recommendation to use clustered self-healing

    routing despite claimed power consumption issues. Secondly, a new technique to

    minimize power consumption, by dynamically changing the sleep interval on the sensor

    nodes with the help of weather data. Furthermore, the proof-of-concept system is

    constructed and analysed to assess whether the system design choices made are valid

    for a real-life deployment.

  • 121299.
    Öberg, Lukas
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology and Design.
    Lindahl, Mikael
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology and Design.
    Systemanalys av plattbroar: En jämförelse inom FE-modellering och balk-/platteori2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Abstract

    When Eurocodes was introduced, there was a requirement where the calculations had to take into consideration whether it's a slab or beam bridge. This means that calculations had to be made with softwares including plate theory.

    The object of this study is a slab bridge with endshields. The bridge is 66.95 meters long with a 14.38-meter-wide deck made of concrete. The deck is mounted on abutments with bearings and intermediate supports where the columns are fixed to the deck.

    The purpose of this study is to investigate if bridges defined as plates can be calculated using beam theory, as well as examining different modeling techniques in an attempt to evaluate how this will affect the results.

    A model using shell elements is established in BRIGADE/Plus and compared to a model in Strip Step 3 made out of beam elements. A base-model is also created in BRIGADE/Plus and is compared to the following modeling changes:

    • Couplings between supports and the plate, “point to surface” or “point to point”.
    • The bridge is modeled without wings to study the impact of the wings.
    • The bridge is modeled without columns to study the impact of the columns.

    When comparing the values obtained from the two different software’s regarding deadweight, the results were almost identical. This indicates that Strip Step 3 is a suitable tool for verifying models made in BRIGADE/Plus. When studying the results from load-combination 6.10.b (the combination used for dimensioning) small differences can be seen between the softwares. This concludes that it may be reasonable to use Strip Step 3 for this type of bridges. However, there are major differences between the software at the traffic load which should be considered.

    In order to simplify the modeling process ties between points (nodes) should be used. However, the results obtained over the supports must be ignored due to unrealistic values. When studying the impact of wings/columns it was confirmed that a difference of 10 % appeared. Modeling without wings/columns is not more time efficient either, with that in mind wings and columns should be used when modeling.

     

    Keywords: Plate theory, Beam theory, Strip Step 3, BRIGADE/Plus, FE-modeling

  • 121300.
    Öberg Löfstrand, Leonard
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology and Design.
    Lagerstam, Fredrik
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology and Design.
    Optimering av stämprivningstider: - En kvantitativ undersökning om stämprivningstider avbostadsbjälklag2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    When casting a residential floor, formwork and shore removal is an important element. There aresome doubts in the industry about when and how to remove the shores. There are instructionsavailable but they are often outdated and difficult to interpret. As a result, they are often notfollowed. Appliances such as measuring equipment and simulation software are available but areused sparingly. To avoid accidents and to ensure that the strength of the concrete is sufficientwithout appliances, excessive time margins are used. This will most likely result in unnecessarily longshoring times.During the course of the work, the subject will be studied in detail to create a clear picture of howthe many different factors of the casted floor influence each other. The purpose is to propose asuitable time to remove the shores. This is done in order to determine if there is improvementpotential, partly to improve the working environment, but also to review the instructions of theapproach.The methods used to reach the result are:• Study of the documents describing the procedure of shoring and reshoring• Calculate the compressive strength of the concrete with the device “BI Distant”• Simulate the compressive strength of the concrete in the program Hett 11.• Interviews by experts in the industry.The results show that the shores could theoretically be removed earlier compared to when they areusually removed in practice. One reason for this is that drying times are governing during theproduction. This means that increased concrete qualities and faster curing times than those thatwere planned, were used in construction, particularly at low temperatures. The conclusion is thatthere is an improvement potential in this area. Reshoring can be done only a few days after castingunder good conditions. The advantages of this are that the number of shores can be reduced. Thisleads to reduced rents, and the accessibility for the subsequent professionals and operations can beimproved.

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