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  • 451.
    Michielsen, Wim
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    VCOs for future generations of wireless radio transceivers2005Doctoral thesis, monograph (Other scientific)
  • 452.
    Mogg, Sebastian
    et al.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Plaine, G.
    Asplund, C.
    Sundgren, P.
    Baskar, K.
    Mulot, M.
    Schatz, Richard
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP. KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Hammar, Mattias
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT. KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
    High-performance 1.2- mu;m highly strained InGaAs/GaAs quantum well lasers2002In: Indium Phosphide and Related Materials Conference, 2002. IPRM. 14th, 2002, p. 107-110Conference paper (Refereed)
    Abstract [en]

    The growth and characterisation of high-performance 1.2- mu;m highly strained InGaAs/GaAs single quantum well (SQW) laser diodes is reported. High output power in excess of 200 mW per facet was obtained from ridge-waveguide (RWG) lasers at an emission wavelength of 1230 nm. These lasers operate CW to at least 145 deg;C and show a high characteristic temperature of 150 K. The net modal gain was measured using the method described by Hakki and Paoli (1975).

  • 453.
    Mola, Guilo
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Interactions of Vertical Handoffs with 802.11b wireless LANs: Handoff Policy2004Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Nomadic computing aims to be a leading short term revolution in the Internet, however to succeed in this the infrastructure, the protocols, the handoff mechanisms have to be designed and implemented to provide mobile computing with both reliability and transparency.

    A good deal of the work is addressed by mobile IP itself, but addressing wireless diversity is perhaps the most important next step. Many different wireless technologies are available; while one technology might provide wide coverage, another provides higher bandwidth, but can only be deployed locally, even uni-directional ad-hoc links can be used to carry IP traffic. To take full advantage of the potential infrastructure, a mobile device, with multiple network interfaces, should be able to dynamically switch from one link technology to another; hopefully totally transparently to the user. Moreover, having multiple interfaces allows the device to choose, each time a new connection is established, which interface to select to route the datagrams through, based on the type of service desired.

    In this thesis a possible solution is presented, involving both vertical handoff optimization and policy management. Our testing device is the the SmartBadge v4, provided with a GPRS link and a 802.11b WLAN interface.

  • 454.
    Moradi, Farshad
    et al.
    FOI.
    Nordvaller, Peder
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Ayani, Rassul
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Simulation Model Composition using BOMs2006In: 10th IEEE International Symposium on Distributed Simulation and Real Time Applications, 2006, p. 242-249Conference paper (Refereed)
    Abstract [en]

    The Base Object Model, BOM, is a new standard for defining reusable and composable simulation components. The introduction of BOMs into the simulation community opens zip the possibility of component based simulation development approach that is faster and more efficient than today's simulation creation process. In this paper we describe a process that has been developed at the Swedish Defence Research Agency (FOI) with the aim to speed up and improve the development of simulation models. This process utilizes the BOM concept coupled with Ontologies in simulation development, and employs SRML (Simulation Reference Markup Language) as a means to define a component based simulation on a high-level. We will present out, experimental results and findings based on our implementation of the proposed process. Our experience indicates that including ontological information in BOMs will further increase their usability.

  • 455.
    Morici, Andrea
    et al.
    Universita Politecnica delle Marche.
    Rodriguez, Saul
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Rusu, Ana
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Ismail, Mohammed
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Turchetti, C.
    Universita Politecnica delle Marche.
    A 3.6 mW 90 nm CMOS 2.4 GHz Receiver Front-End Design for IEEE 802.15.4 WSNs2009In: ISSCS 2009: INTERNATIONAL SYMPOSIUM ON SIGNALS, CIRCUITS AND SYSTEMS, VOLS 1 AND 2, PROCEEDINGS, New York: IEEE , 2009, p. 77-80Conference paper (Refereed)
    Abstract [en]

    In this paper a low-power design of an integrated RF receiver for Wireless Sensor Networks (WSNs) in 90nm CMOS technology is proposed. The receiver is IEEE 802.15.4 physical specifications compliant. It is designed to operate in ISM band at 2.45 GHz center frequency. Target devices for this kind of transceiver are low-cost battery powered smart embedded devices and sensors. The receiver is designed to reduce the count of external components in the final system, integrating on silicon the balun for single-ended to differential conversion. The receiver is composed of an inductorless Low Noise Amplifier (LNA), a buffer stage, I and Q passive mixers and Variable Gain Amplifiers (VGAs) that also act as second order filters. A novel integration of balun into the LNA is described. The system is designed to have direct conversion from RF to 6 MHz low-IF. Voltage supply is 1.2 V with a current consumption of 3 mA including necessary biasing networks, and the total power consumption is 3.6 mW. The complete voltage gain is more than 41.5 dB with a Noise Figure (NF) of 12.6 dB. The receiver layout exhibits an area of only 0.12 mm(2). Simulations are provided, including mismatch scenarios.

  • 456. Morthier, G.
    et al.
    Baets, R.
    Tsang, C. F.
    Caroll, J. E.
    Wenzel, H.
    Mecozzi, A.
    Sapia, A.
    Correc, P.
    Hansmann, S.
    Burkhardt, H.
    Bonello, R.
    Montrosset, I.
    Lassen, H. E.
    Olesen, H.
    Schatz, Richard
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP. KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT. KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Photonics.
    Bissessur, H.
    Vey, J-L
    Duan, G.
    Comparison of different DFB laser models within the European COST 240 collaboration1993In: Integrated Photonics Research (IPR) Palm Springs, California March 22, 1993    Semiconductor Device Modeling 1 (IWB), 1993Conference paper (Refereed)
  • 457. Morthier, G.
    et al.
    Schatz, Richard
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP. KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Kjebon, Olle
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Extended modulation bandwidth of DBR and external cavity lasers by utilizing a cavity resonance for equalization2000In: IEEE Journal of Quantum Electronics, ISSN 0018-9197, E-ISSN 1558-1713, Vol. 36, no 12, p. 1468-1475Article in journal (Refereed)
    Abstract [en]

    We have investigated the occurence of a second resonance frequency in distributed Bragg reflector laser diodes and the high modulation bandwidth resulting from it. The influence of different laser parameters has been theoretically investigated. It is also shown that a similar behavior can be obtained in laser diodes with a passive, low-loss, and gratingless external cavity, The possibilities of large-signal digital modulation are also investigated.

  • 458. Morthier, G.
    et al.
    Verhoeve, P.
    Baets, R.
    Schatz, Richard
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP. KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Extraction of a large set of laser parameters from different measurements1996In: Semiconductor Laser Conference, 1996., 15th IEEE International, 1996, p. 175-176Conference paper (Refereed)
    Abstract [en]

    We show how most of the parameters of a DFB laser can be extracted from a limited number of relatively simple measurements. These measurements include the ASE spectra at different currents below threshold, the RIN spectra above threshold and the P-I relation. We have performed curve-fitting on different characteristics such as the ASE spectrum, the RIN spectrum and the P-I curve. From the ASE spectrum measured in the vicinity of the lasing wavelength we can extract grating parameters, facet phases, refractive index and gain as well as the wavelength and current dependence of the last two parameters

  • 459. Morthier, Geert
    et al.
    Baets, Roel
    TSIGOPOULOS, A
    SPHICOPOULOS, T
    TSANG, CF
    CARROLL, JE
    WENZEL, H
    MECOZZI, A
    SAPIA, A
    CORREC, P
    HANSMANN, S
    BURKHARD, H
    PARADISI, A
    MONTROSSET, I
    OLESEN, H
    LASSEN, HE
    Schatz, Richard
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP. KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT. KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Photonics.
    BISSESSUR, H
    COMPARISON OF DIFFERENT DFB LASER MODELS WITHIN THE EUROPEAN COST-240 COLLABORATION.1994In: IEE Proceedings - Optoelectronics, ISSN 1350-2433, E-ISSN 1359-7078, Vol. 141, p. 82-88Article in journal (Refereed)
  • 460.
    Mosavat, Vahid
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    SIP Extensions for the eXtensible Service Protocol2003Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The switched telephony network was designed for voice calls. Expansion of datacommunication has lead to a wide range of experimentation to create new services.

    Theses services take place outside the network. When adding new services we currently encounter problems due to limitations of the simple devices at end points. Theo Kanter has proposed a new model to remove these limitations; this model is called “Adaptive Personal Mobile Communication”. The model consists of several components in the application layer of ISO standard. This model is based on peer to peer connections and the purpose of this model is to move services from within the networks to end point devices and avoid using central servers within the network.

    The Session Initiation Protocol (SIP) for establishing multimedia sessions allows us to move the point of integration for multimedia service integration out to the end-points. This project concerns the implementing of a prototype of this model as an SIP extension along with it evaluation. SIP offer addressing, naming, and localization of resources in this project.

    This report presents different design alternatives for XSP as an SIP extension, and the chosen model presents as a result of comparing of these design alternatives.

  • 461.
    Muchanga, Americo Francisco
    et al.
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Orava, Fredrik
    Haralson, Joanna
    Inter-domain routing in optical networks2005In: OPTICAL NETWORKS AND TECHNOLOGIES, 2005, Vol. 164, p. 263-270Conference paper (Refereed)
    Abstract [en]

    In this paper we present a mechanism for obtaining an abstraction of network topology in optical networks in order to compute an end-to-end lightpath across multiple domains.

  • 462.
    Muchanga, Americo
    et al.
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Orava, Fredrik
    KTH, School of Information and Communication Technology (ICT).
    Inter-layer communication for improving restoration time in optical networks2006In: Optical Fiber Communication Conference, 2006 and the 2006 National Fiber Optic Engineers Conference. OFC 2006, WASHINGTON: OPTICAL SOC AMERICA , 2006, p. 1455-1461Conference paper (Refereed)
    Abstract [en]

    The restoration time in high capacity optical networks has to be kept as short as possible in order to avoid a huge loss of data. This paper discusses several methods to improve restoration time in optical networks and we propose the use of error codes that will trigger immediately the appropriate layer recovery mechanism, which is the best to handle a given fault.

  • 463.
    Muchanga, Américo
    et al.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Bagula, Antoine B
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Inter-layer communication for faster restoration in a 10Gigabit Ethernet based network2006In: Reliability of Optical Fiber Components, Devices, Systems, and Networks III, 2006, Vol. 6193Conference paper (Refereed)
    Abstract [en]

    The restoration time in high capacity optical networks has to be kept as short as possible in order to avoid a huge loss of data. This paper discusses several methods to improve restoration time in optical networks and we propose mechanisms of implementing such inter-layer communication in order to decrease restoration time for a 10Gigabit Ethernet based network.

  • 464.
    Muchanga, Américo Francisco
    et al.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Bagula, Antoine
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    On using fast signalling to improve restoration in multilayer networks2006In: Optical Fiber Communication and the National Fiber Optic Engineers Conference, 2007. OFC/NFOEC 2007., 2006, p. 1-12Conference paper (Refereed)
    Abstract [en]

    We present a fast signalling scheme where intra-layer signalling and inter-layer communication are used to reduce the recovery operation time. Simulation reveals the efficiency of the scheme compared to normal signalling strategies.

  • 465.
    Muchanga, Américo Francisco
    et al.
    KTH, School of Information and Communication Technology (ICT).
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Orava, Fredrik
    KTH, School of Information and Communication Technology (ICT).
    Providing QoS in end to end Optical Networking. 2006Report (Other academic)
  • 466.
    Muchanga, Américo
    et al.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Orava, Fredrik
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Haralson, Joanna
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Requirements for interdomain routing in optical networks2005In: National Fiber Optic Engineers Conference (NFOEC) 2005, Optical Society of America, 2005Conference paper (Refereed)
    Abstract [en]

    In this paper we present a mechanism for obtaining an abstraction of network topology in optical networks in order to compute an end-to-end lightpath across multiple domains in GMPLS networks. We also propose changes to BGP in order to carry the abstracted information. Furthermore we use Opnet to simulate MPLS operation as a special case of GMPLS.

  • 467.
    Mukherjee, Amitava
    et al.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Biswas, Agnimitra
    Simple implementation framework for m-government services2005In: ICMB 2005: International Conference on Mobile Business / [ed] Brookes, W; Lawrence, E; Steele, R; Chang, E, 2005, p. 288-293Conference paper (Refereed)
    Abstract [en]

    In today's world, where mobile and wireless technology [1], [10] are growing without bounds, the extension of e-government services to m-governance seems to be not a distant reality [2]-[3], [10]. M-Government is itself a complex business strategy for the efficient utilization of all wireless devices providing for instant availability of services and information for better benefits to users. This concept paper proposes the implementation framework for m-Government services to different parties like citizens, businesses and governments. This implementation framework contains two guidelines namely the network architecture for m-Government and the implementation methodology for its (government's) services to different parties particular to citizens. The implementation methodology, we propose here, will be applied with to other parties with some modifications of this methodology. This framework for m-Government services points to Indian context in few occasions as an example case to explain the fact.

  • 468.
    Mukherjee, Amitava K.
    et al.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Biswas, A.
    E-governance in INDIA2005In: Proc. Int. Conf. Internet Multimedia Syst. Appl., 2005, p. 429-433Conference paper (Refereed)
    Abstract [en]

    Information and communication technologies (ICTs) are playing increasingly important roles in the day-to-day lives of people, revolutionizing their work and leisure, and changing rules of doing businesses. Development of ICT leads up to E-governance, which has now become the most talked word around the world. In this paper, we have done the study on the various e-government projects across India with a view to explore the natures of implementations of these projects, benefits imparted from them to citizens and their up- and down-sides.

  • 469.
    Mukherjee, Amitava
    et al.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT. IBM Global Services India, India .
    Saha, Debashis
    Biswas, Chinmohan
    Present scenarios and future challenges in pervasive middleware2006In: 2006 1st International Conference on Communication Systems Software & Middleware, Vols 1 and 2, 2006, p. 406-410Conference paper (Refereed)
    Abstract [en]

    In order to run applications on pervasive devices, pervasive middleware has to support context-awareness, as pervasive applications need to adapt to variations of context of execution (such as network bandwidth, battery power and screen size), physical change of locations, change of technological artifacts (devices), change of hardware resources of artifacts, and so on. Recent research efforts have primarily focused on designing new mobile n iddleware systems capable of supporting the requirements imposed by mobility. However, apart from mobility constraint, pervasive rniddleware will operate under above-mentioned conditions of a radical change. This change is varying from physical components (like network heterogeneity) to functional components (right from heterogeneous devices to context-based applications). Few contemporary researches have indeed focused on some parts of these requirements; but a qualitative difference between intended requirements and practical achievements still remains there. In this article, we discuss some of recent mobile/pervasive middleware systems, focusing on research issues and challenges ahead to brid e the gap. Typically, we highlight the key characteristics of pervasive middleware to support context awareness and service discovery, smartness mid adaptation, heterogeneity and integration, and intelligent interfacing.

  • 470.
    Mukherjee, Amitava
    et al.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Fault management for next-generation IP-over-WDM networks2005In: 2005 7th International Conference on Transparent Optical Networks, Vol 1, Proceedings, 2005, p. 423-428Conference paper (Refereed)
    Abstract [en]

    In this paper, we present a broad outline for fault management for next generation IP-over-WDM network. This system contains three different components namely fault detection, fault recovery and fairness service provisions for different needs. We also review various fault detection and fault recovery schemes for WDM networks.

  • 471.
    Mulahusic, Jasminko
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    IPv6 Integration into 3G Mobile Networks2001Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The tremendous growth of the Internet over the past decade, as well as its continuing high growth rate, is starting to push the current Internet Protocol, IPv4, towards its limits. Where IPv4 is becoming insufficient are limited address space, security, and QoS. Considering these facts, a new protocol (IPv6), that will eventually replace current IPv4, has been designed and work is going on for its promotion and deployment. The introduction of 3G (3rd Generation) Mobile Networks is expected to be first significant commercial deployment of IPv6. The decision has been made within 3GPP to adopt and implement IPv6 as the transport protocol for 3G Mobile Networks. This has been suggested as a possible force that will speed up large scale IPv6 deployment encompassing all the Internet.

    This thesis examines how far IPv6 implementation has come and if IPv6 is mature enough for large-scale deployments. The focus is on to understand the structure of protocol and to give a picture of how well its implementations work in real environments. Implementations so far are surveyed and selected parts of these implementations were tested in a lab environment. Parts that were tested were selected according to their importance for 3G Mobile Networks, e.g. parts of the protocol directly affecting Mobile IPv6, such as neighbor discovery, address autoconfiguration, etc.

  • 472.
    Nankani, Ajeet
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Horizontal Handoffs within WLANs: A detailed analysis and measurement concerning voice like traffic2005Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    IEEE 802.11 based Wireless Local Area Networks (WLANs) in addition to being used as access networks for providing traditional data services, are now also being used as access networks for providing realtime services such as VoIP and multimedia streaming. These realtime services are sensitive to latency, hence requiring seamless or low delay service from the lower layers throughout an ongoing session. The IEEE 802.11 standard does not define any technique or algorithm to provide seamless connectivity during the process of handoff, hence it does not require 802.11 based WLANs to provide the same. Thus, it is typical that there is a latency of 500 milliseconds to 1000 milliseconds during the handoff, before the mobile station can connect and receive data from the new access point (AP). However, many realtime services can not tolerate this much latency.

    The problem of handoff latency is further aggravated when WLANs are secured using IEEE 802.11i standard and when Authentication, Authorization & Accounting (AAA) services are involved in controlling network access to 802.11 based WLANs. This thesis will address the entire handoff process and examine the latency -- especially regarding AAA services. Different techniques and suggestions will be presented and analyzed closely at different layers and based on the results, an appropriate/efficient algorithm is suggested which will reduce this handoff latency, such that that seamless handoff can be achieved and realtime services can be provided over 802.11i enabled IEEE 802.11 WLANs.

  • 473.
    Nilsson, Erland
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Exploring trade-offs between Latency and Throughput in the Nostrum Network on Chip2006Licentiate thesis, comprehensive summary (Other scientific)
    Abstract [en]

    During the past years has the Nostrum Network on Chip (NoC) been developed to become a competitive platform for network based on-chip communication. The Nostrum NoC provides a versatile communication platform to connect a large number of intellectual properties (IP) on a single chip. The communication is based on a packet switched network which aims for a small physical footprint while still providing a low communication overhead. To reduce the communication network size, a queue-less network has been the research focus. This network uses de ective hot-potato routing which is implemented to perform routing decisions in a single clock cycle.

    Using a platform like this results in increased design reusability, validated signal integrity, and well developed test strategies, in contrast to a fully customised designs which can have a more optimal communication structure but has a significantly longer development cycle to verify the new design accordingly.

    Several factors are considered when designing a communication platform. The goal is to create a platform which provides low communication latency, high throughput, low power consumption, small footprint, and low design, verification, and test overhead. Proximity Congestion Awareness is one technique that serves to reduce

    the network load. This leads to that the latency is reduced which also increases the network throughput. Another technique is to implement low latency paths called Data Motorways achieved through a clocking method called Globally Pseudochronous Locally Synchronous clocking. Furthermore, virtual circuits can be used to provide guarantees on latency and throughput. Such guarantees are dificult in

    hot-potato networks since network access has to be ensured. A technique that implements virtual circuits use looped containers that are circulating on a predefined circuit. Several overlapping virtual circuits are possible by allocating the virtual circuits in different Temporally Disjoint Networks.

    This thesis summarise the impact the presented techniques and methods have on the characteristics on the Nostrum model. It is possible to reduce the network load by a factor of 20 which reduces the communication latency. This is done by distributing load information between the Switches in the network. Data Motorways

    can reduce the communication latency with up to 50% in heavily loaded networks. Such latency reduction results in freed buffer space in the Switch registers which allows the traffic rate to be increased with about 30%.

  • 474.
    Nilsson, Erland
    et al.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Öberg, Johnny
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Trading off Power versus Latency using GPLS Clocking in 2D-Mesh NoCs2005In: Isscs 2005: International Symposium On Signals, Circuits And Systems, Vols 1 And 2, Proceedings , New York, USA: IEEE , 2005, p. 51-54Conference paper (Refereed)
    Abstract [en]

    To handle the design complexity when the number of transistors on-chip reaches one billion, new ways of organizing chips will be needed. One solution to this problem is to organize computational resources in a grid, where all communication between the resources are performed using an interconnection network. These networks are commonly referred to as Networks-on-Chip, or NoCs.

    This paper focus on the trade-off between power and latency while keeping the required interconnection bandwidth constant. The clock frequency can be lowered to reduce the power, with reduced bandwidth as a consequence, which in a synchronous system will increase the latency linearly. In a 2D-Mesh NoC structure, it is possible to choose the regions with different clock phase and arrange them in such ways that the latency from sender to receiver along certain paths is nearly constant, and the total average latency is reduced with 50%. The reduction can then be exploited to trade off latency vs. power; the GPLS solution consumes 50% or the power compared to the fully synchronous solution, at the same latency and constant throughput.

  • 475. Nilsson, S.
    et al.
    Kjellberg, T.
    Klinga, T.
    Schatz, Richard
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP. KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Wallin, J.
    Streubel, K.
    Improved spectral characteristics of MQW-DFB lasers by incorporation of multiple phase-shifts1995In: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 13, p. 434-441Article in journal (Refereed)
    Abstract [en]

    The single-mode stability of strained-layer MQW-DFB lasers with electron-beam written gratings containing zero, one and three phase-shifts, and with a relatively large coupling strength, has been investigated theoretically and experimentally. The fabricated lasers with the multiple phase-shifted (MPS) structure exhibited a higher degree of stability than the lambda;/4-shifted lasers, and a considerably improved stability for both categories with phase-shifts compared to the nonshifted lasers was obtained. These results were in good agreement with our simulations. An investigation of the linewidths of the phase-shifted lasers is also presented. The MPS lasers had a significantly lower linewidth floor (down to 600 kHz) than those with one phase-shift. There was no degradation of the side-mode suppression-ratio correlated to the linewidth floor or rebroadening. A possible explanation for the lower linewidth floors obtained for the MPS lasers is that this structure is less sensitive to inhomogeneous carrier fluctuations. Longitudinal fluctuations in the shape of the photon density distribution will thereby be suppressed

  • 476.
    Nilsson, S.
    et al.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Kjellberg, T.
    Klinga, T.
    Wallin, J.
    Streubel, K.
    Schatz, Richard
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP. KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    DFB laser with nonuniform coupling coefficient realized by double-layer buried grating1993In: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 5, p. 1128-1131Article in journal (Refereed)
    Abstract [en]

    A technique for the realization of a nonuniform grating coupling coefficient kappa , and its implementation in distributed-feedback (DFB) lasers is presented. This technique, which is an extension of the buried-grating concept, offers precise control of the coupling coefficient and enables a kappa -ratio greater than 10. DFB lasers with an asymmetric kappa -variation have been fabricated using this method. A front-to-rear facet output power ratio close to five was obtained, qualitatively in agreement with simulations.<>

  • 477.
    Niu, Yuechao
    et al.
    KTH.
    Baghaei Nejad, Majid
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Tenhunen, Hannu
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Zheng, Lirong
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Design of a Digital Baseband Processor for UWB Transceiver on RFID Tag2007In: 21st International Conference on Advanced Networking and Applications Workshops/Symposia, Vol 2, Proceedings, IEEE Computer Society, 2007, Vol. 2, p. 358-361Conference paper (Refereed)
    Abstract [en]

    In this paper we present a novel digital baseband processor designed for UWB transceiver on RFID tag. It is a low power and low voltage (1.8V) full digital ASIC which is implemented in 0.18 mu m CMOS technology. The processor receives serial signals (consist of data and commands) from the RF Receiver, and based on received command carries out various functions such as receive data and write to the memory, compare data, send data, set/reset tag, kill tag and etc. The processor mainly consists of eight sub modules: Receive Buffer, Transmit Buffer, Random Number Generator (RNG), Slot Counter, Memory Controller, Reset Counter, Comparator, Controller.

  • 478.
    Norberg, Gunnar
    et al.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Dejanovic, Slavko
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Hesselbom, Hjalmar
    Contact Resistance of Thin Film Metal Contacts2006In: IEEE transactions on components and packaging technologies (Print), ISSN 1521-3331, E-ISSN 1557-9972, Vol. 29, no 2, p. 371-378Article in journal (Refereed)
    Abstract [en]

    To be able to reduce the size of products having electronic devices, it becomes more and more important to miniaturize the electromechanical parts of the system. The use of micromechanical connectors and contact structures implies the need of methods for estimating the properties of such devices. This work will, by use of finite element modeling, treat the influence of a thin film constituting at least one of the contacting members of an electrical contact. The error introduced by using the traditional Maxwell/Holm contact constriction resistance theory will be investigated. Numerical methods are used to present a way to approximate the total resistance for the thin metal film contact.

  • 479.
    Norberg, Gunnar
    et al.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Dejanovic, Slavko
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Persson, Ulf
    Hesselbom, Hjalmar
    High Frequency Signal Transmission Properties of Elastomer Chip SocketsArticle in journal (Refereed)
  • 480. Norström, H.
    et al.
    Johansson, Ted
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Formation of a buried collector layer in RF-bipolar devices by ion implantation2006In: MICROELECTRONICS JOURNAL, ISSN 0026-2692, Vol. 37, no 11, p. 1366-1371Article in journal (Refereed)
    Abstract [en]

    High-dose implantation of arsenic (As) buried collector layer formation for bipolar/BiCMOS processes has been studied. Wafers with and without screen oxide were subjected to high-dose implants with different energies. Some wafers were given a low-temperature anneal before XTEM and SIMS analyses. Defects observed after As implants of 6E15 cm(-2) through screen oxide after low-temperature anneal were annihilated at the subsequent high-temperature steps, but the direct implant of As into the silicon is preferred since fewer defects are generated and there is no knock-on of oxygen into the material. Fabricated devices showed excellent electrical performance. However, the upper limit (dose and/or energy) at which perfect recrystallization does no longer occur has not been defined and the process limit is consequently not established.

  • 481. Nurmi, J.
    et al.
    Tenhunen, HannuKTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.Isoaho, JouniJantsch, AxelKTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Interconnect-centric design for advanced SoC and NoC2005Collection (editor) (Refereed)
    Abstract [en]

    In Interconnect-centric Design for Advanced SoC and NoC, we have tried to create a comprehensive understanding about on-chip interconnect characteristics, design methodologies, layered views on different abstraction levels and finally about applying the interconnect-centric design in system-on-chip design. Traditionally, on-chip communication design has been done using rather ad-hoc and informal approaches that fail to meet some of the challenges posed by next-generation SOC designs, such as performance and throughput, power and energy, reliability, predictability, synchronization, and management of concurrency. To address these challenges, it is critical to take a global view of the communication problem, and decompose it along lines that make it more tractable. We believe that a layered approach similar to that defined by the communication networks community should also be used for on-chip communication design. The design issues are handled on physical and circuit layer, logic and architecture layer, and from system design methodology and tools point of view. Formal communication modeling and refinement is used to bridge the communication layers, and network-centric modeling of multiprocessor on-chip networks and socket-based design will serve the development of platforms for SoC and NoC integration. Interconnect-centric Design for Advanced SoC and NoC is concluded by two application examples: interconnect and memory organization in SoCs for advanced set-top boxes and TV, and a case study in NoC platform design for more generic applications.

  • 482.
    O'Kane, Aisling
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Trusting experience oriented design2011In: Conf Hum Fact Comput Syst Proc, 2011, p. 923-928Conference paper (Refereed)
    Abstract [en]

    Although trust and affective experiences have been linked in HCI research, a connection between traditional trust research for automation and experience design has not be made. This paper aims to start this discussion by showing the connection between experience-oriented HCI design and trust in automation through an experimental study of the Lega, a companion device for enriching experiences in museums. An experience-oriented HCI design approach was used to create this device and although it is not traditional automation, this study presents the links found between this approach and the bases of trust in automation, performance, process, and purpose, with regards to experience qualities of transparency, ambiguity, and usefulness, respectively.

  • 483. Olsen, U. L.
    et al.
    Badel, Xavier
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Linnros, Jan
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Di Michiel, M.
    Martin, T.
    Schmidt, S.
    Poulsen, H. F.
    Development of a high-efficiency high-resolution imaging detector for 30-80 keV X-rays2007In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 576, no 1, p. 52-55Article in journal (Refereed)
    Abstract [en]

    A newly developed fabrication method makes the formation of deep structured scintillator screens possible. We demonstrate that electrochemical etching in silicon can be used to produce regular arrays of 120 mu m deep pores with a 4 mu m pitch. A layer of SiO2 is grown on the pore walls and CsI:Tl is melted into the pores, resulting in a structure with a high refractive index core surrounded by a quartz cladding, providing efficient light guiding. The efficiency and radiation hardness of the scintillator is evaluated in realistic environment at beamline ID15 at the ESRF synchrotron. The efficiency is measured to be a factor two higher than a planar YAG:Cc scintillator of equal thickness, while radiation damage is found to be neglectable for doses up to at least 2 x 10(4) Gy.

  • 484.
    Olsson, Fredrik
    et al.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Aubert, Amandine
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Avella, M.
    Jiménez, J.
    Barrios, C. A.
    Berggren, Jesper
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Lourdudoss, Sebastian
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Heteroepitaxy of InP on Silicon-on-Insulator for Optoelectronic Integration2007In: ECS Transactions, ISSN 1938-5862, Vol. 3, no 39, p. 23-29Article in journal (Refereed)
    Abstract [en]

    Epitaxial lateral overgrowth of InP was performed on patterned silicon-on-insulator (SOI) and compared with that on Si substrates in a low pressure hydride vapor phase epitaxy system. The InP was characterized by cathodoluminescence. No red shift of peak wavelength was detected for InP/SOI indicating a negligible thermal strain. Additional low energy peaks were found in some regions with a granular structure on the SOI template. A subsequent growth of an InGaAsP/InP MQW (multi quantum well) structure (λ∼1.5 μm) was grown on the SOI template and on a planar InP reference sample by metal-organic phase epitaxy. The MQW was characterized by room temperature photoluminescence. A red shift of 35 nm with respect to the reference sample was attributed to the selective-area effect causing thicker wells and/or an increased indium content. Although the PL intensity was weaker than that obtained for the reference, the FWHMs were comparable.

  • 485.
    Olsson, Fredrik
    et al.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Zhu, Tiankai
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Mion, Gaël
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Lourdudoss, Sebastian
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Large mask area effects in selective area growth2006In: Journal of Crystal Growth, ISSN 0022-0248, E-ISSN 1873-5002, Vol. 289, no 1, p. 24-30Article in journal (Refereed)
    Abstract [en]

    In this paper we analyze for the first time selective area growth (SAG) of GaAs by MOVPE on dark field patterns, where the different masking features are dense and at the same time the openings are surrounded by very large mask area (larger than the openings) in all directions. The growth efficiency as a function of filling factors is analyzed using one- and two-dimensional filling factors. That the SAG efficiency cannot be greater than one is found to be true, if a two-dimensional filling factor is employed; this treatment involves three-dimensional transport of the growth rendering species. Finite element method has been used to derive the longitudinal thickness profile in the openings by considering the three-dimensional model. The derived longitudinal thickness profile is found to fit very well with the experimentally measured profile. The diffusion length of the growth rendering species is also extracted from the above profile. For comparison, light field patterns are also treated. Our analysis confirms many previous observations that SAG in the light field patterns can be sufficiently explained by the two-dimensional model.

  • 486. Pal, A.
    et al.
    Paul, A.
    Mukherjee, Amitava
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Naskar, M. K.
    Fault and attack management in optical network2007In: 2007 1st International Symposium on Advanced Networks and Telecommunications Systems, ANTS, IEEE , 2007, p. 25-26Conference paper (Refereed)
    Abstract [en]

    This paper proposes a scheme containing (a) the detection of faults or attacks through monitoring devices raising alarms and (b) the localization of them by invoking an algorithm. We demonstrate the performance of this scheme on Euro Net.

  • 487.
    Palm, T.
    et al.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Hallberg, J.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Brorsson, Mats
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Cache-Conscious Allocation of Pointer-Based Data Structures Revisited with HW/SW Prefetching2003Conference paper (Refereed)
    Abstract [en]

    As memory access times continue to be a bottleneck, differential research is required for better understanding of memory access performance. Studies of cache-conscious allocation and software prefetch have recently sparked research in the area of software optimizations on memory, as pointer-based data structures previously have been elusive to the optimizing techniques available. Research on hardware prefetch mechanisms have in some cases shown improvements, but less analytical schemes have tended to degrade performance for pointer-based data structures. This paper combines four hardware schemes, normally not efficient on pointer-based data structures, and a greedy software prefetch with cache-conscious allocation to evaluate positive effects of increased locality, in a comparative evaluation, on five level 1 data cache line sizes. We show that cache-conscious allocation utilizes large cache lines efficiently and that none of the prefetch strategies evaluated add significantly to the effect already achieved by the cache-conscious allocation on the hardware evaluated. The passive prefetching mechanism of using large cache lines with cache-conscious allocation is by far outstanding.

  • 488.
    Palmgren, Pål
    et al.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Szamota-Leandersson, Katolina
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Weissenrieder, Jonas
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Claesson, Thomas
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Tjernberg, Oscar
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Karlsson, Ulf O.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Göthelid, Mats
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Chemical reaction and interface formation on InAs(111)-Co surfaces2005In: Surface Science, ISSN 0039-6028, E-ISSN 1879-2758, Vol. 574, no 2-3, p. 181-192Article in journal (Refereed)
    Abstract [en]

    We report a study of the initial interface formation of Co on InAs(1 1 1)A and B surfaces using high resolution photoelectron spectroscopy and scanning tunneling microscopy. We observe a strong chemical interaction between Co and, in particular, surface indium forming a metallic overlayer already below monolayer coverage. On annealed surfaces this overlayer agglomerates into islands, with a narrow size distribution. Furthermore, no two-dimensional electron gas is formed on InAs(1 1 1)A-Co in contrast to the clean surface.

  • 489. Panaccione, G.
    et al.
    Offi, F.
    Torelli, P.
    Vanko, G.
    Tjernberg, Oscar
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Lacovig, P.
    Guarino, A.
    Fondacaro, A.
    Nigro, A.
    Sacchi, M.
    Brookes, N. B.
    Monaco, G.
    Analysis of surface-bulk screening competition in the electron-doped Nd2-xCexCuO4 cuprate using x-ray photoemission spectroscopy2008In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 77, no 12Article in journal (Refereed)
    Abstract [en]

    We report core level and valence band photoemission results obtained for Nd2-xCexCuO4 (x = 0.15) single crystals and films by using both soft and hard x rays, hence, with tunable depth sensitivity. When using hard x rays only, we observe distinct and energy separated structures in the main 2p(5)3d(9)L peak of Cu 2p(3/2) and 2p(1/2) core levels, including the well screened features located at the high kinetic energy side, which were recently reported by Taguchi et al. [Phys. Rev. Lett. 95, 177002 (2005)]. By varying the photoelectron takeoff angle, we analyze the difference in the screening properties between surface and bulk, and we demonstrate the depth dependence of the electronic properties by following the evolution of the bulk-related peak. The possible influence of the surface conditions on the Cu 2p spectral features is also discussed.

  • 490.
    Paone, Eduardo
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Open-Source SCA Implementation-EmbeddedandSoftware Communication Architecture: OSSIE and SCA Waveform Development2010Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Software Defined Radios (SDRs) are redefining the current landscape of wireless communications in both military and commercial sectors. The rapidly evolving capabilities of digital electronics are making it possible to execute significant amounts of signal processing on general purpose processors ratherthan using special-purpose hardware.

    As a consequence of the availability of SDR, applications can be used to implement flexible communication systems in an operating prototype within a very short time. However, the initial lack of standards and design rules leads to incompatibility problems when using products from different manufacturers. This problem is critical for the military and public safety sectors, for this reason the US Army was interested in SDR and carried out research into the specification of a common software infrastructure for SDR. This initiative started in the mid-1990s and evolved into the Software Communications Architecture (SCA).

    SCA is a non-proprietary, open architecture framework that allows a designer to design interoperable and platform independent SDR applications. At the same time the SCA framework, by abstracting the radio communication system, speeds up waveform development because developers no longer have to worry about hardware details.

    This thesis project uses OSSIE, an open source SCA implementation, to illustrate the process of developing a waveform. Today companies are exploiting open source solutions and investing money to evaluate and improve available technologies rather than developing their own solutions: OSSIE provides a working SCA framework without any license cost. OSSIE also provides some tools to develop SCA waveforms. Of course open source software comes with some limitations that a designer must take into account. Some of these limitations will be described for OSSIE (specifically the limited documentation and lack of libraries), along with some suggestions for how to reduce their impact.

    This thesis project shows in detail the development process for SCA waveforms in OSSIE. These details are examined in the course of successfully implementing a target waveform to enable the reader to understand the advantagies and disadvantages of this technology and to facilitate more people using OSSIE to develop waveforms. Although a waveform was successfully implemented there were unexpected issues with regard to the actual behavior of the waveform when implemented on the hardware used for testing.

  • 491.
    Parajón Domínguez, María José
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Audio for Nomadic Users2003Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    An increasing number of appliances and portable devices, such as cordless phones, Personal Digital Assistants (PDAs), and laptops are used in our everyday life, both at home and work. These devices coexist, on many occasions, with non-portable devices, such as fixed phones and personal computers. All these devices have something in common. The user’s state is not taken into account when they provide their service. This results in the user being constantly interrupted, when not desired or missing very urgent notification(s) if the devices are turned off. Additionally, having so many different devices, each providing unique and different notifications, consumes unnecessary time from the user, who must attend to them separately.

    In order to improve this situation we seek to exploit the improvements in the fields of speaker and speech recognition, and text to speech synthesis. We were also inspired by the concept “Nomadic Radio”. This concept is defined as “... a wearable computing platform that provides a unified audioonly interface to remote services and messages such as email, voice mail, hourly news broadcast, and personal calendar events...”[1]. To achieve the goals proposed by “Nomadic Radio” a good context-aware multimedia infrastructure must also exist.

    We considered the “SmartBadge version 4” a suitable platform to test the concept of “Nomadic Radio” extended by context-awareness. Hence, this thesis studied how to exploit audio for mobile users, by building a client/server application using “SmartBadge version 4”. This application consists of a playlist manager that will manage audio files by placing them in the appropriate position in the playlist as various clients dynamically generate new audio content or send pre-existing content such as MPEG files. This application interacts with several clients, all communicating via the UDP protocol. One of these clients provides a user interface for selecting audio files and determining the order in which to play them. Another client uses text-to-speech synthesis to generate audio alerts. Another client is a player for several different types of audio files, enabling a user to listen to these files (songs in different formats, notifications,...) all on the same device, resulting in an approximation of a “Nomadic Radio” with the sensor rich “SmartBadge version 4” as the underlying hardware platform.

  • 492. Paranichev, D.
    et al.
    Velichko, A.
    Putrolaynen, V.
    Grishin, Alexander
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Photovoltaic properties of Si-NiO structure2012In: Physica Status Solidi (C) Current Topics in Solid State Physics, ISSN 1862-6351, Vol. 9, no 7, p. 1597-1599Article in journal (Refereed)
    Abstract [en]

    The investigation of the photovoltaic properties of a Si-NiO structure was carried out. NiO films were prepared by thermal oxidation of metallic nickel at different temperatures. The load and luminous characteristics were obtained, and on the basis of these measurements the efficiency, fill factor, short circuit current and open-circuit voltage were determined. Finally, possible mechanisms of the observed phenomena, as well as the possibility of their use for optoelectronic devices, are briefly discussed.

  • 493. Parekh, D.
    et al.
    Thylén, Lars
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT. University of California, Berkeley, United States .
    Chang-Hasnain, C. J.
    Metal nanoparticle and quantum dot metamaterials for near resonant surface plasmon waveguides2007In: 2007 International Nano-Optelectronics Workshop, iNOW, 2007, p. 150-151Conference paper (Refereed)
    Abstract [en]

    We analyze metamaterials based on silver nanospheres hosted in a lossless dielectric for use in high confinement surface plasmon waveguides. Propagation lengths and lateral confinement orders of magnitude better than bulk materials are shown.

  • 494. Paskova, T.
    et al.
    Paskov, P. P.
    Darakchieva, V.
    Kroeger, R.
    Hommel, D.
    Monemar, B.
    Lourdudoss, Sebastian
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Preble, E.
    Hanser, A.
    Williams, M. N.
    Tutor, M.
    Strain-free low-defect-density bulk GaN with nonpolar orientations2006Conference paper (Refereed)
    Abstract [en]

    Bulk GaN sliced in bars along (11-20) and (1-100) planes from a boule grown in the [0001] direction by HVPE was confirmed as strain free material with a low dislocation density by using several characterization techniques. The high-structural quality of the material allows photoluminescence studies of free excitons, principal donor bound excitons and their twoelectron satellites with regard to the optical selection rules. Raman scattering study of the bulk GaN with nonpolar orientations allows a direct access to the active phonon modes and a direct determination of their strain-free positions.

  • 495. Peltonen, Teemu
    et al.
    Shen, Meigen
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Koivisto, Tero
    Duo, Xinzhong
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Tjukanoff, Esa
    Zheng, Li-Rong
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Tenhunen, Hannu
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    A 0.18 #x003BC;m CMOS Ultra-Wideband Low-Noise Amplifier with High IIP32005In: Proceedings of the Seventh IEEE CPMT Conference on High Density Microsystem Design, Packaging and Failure Analysis (HDP'05), 2005, p. 452-454Conference paper (Refereed)
    Abstract [en]

    In this paper an ultra-wideband low-noise amplifier (LNA) for the frequency range of 3.1 - 9.4 GHz using 0.18 mu m CMOS RF process is introduced. Single-ended single stage LNA structure utilises an input LC-ladder, cascode transistor configuration and LRC-feedback to realise an ultra broad bandwidth response. In operating frequency range noise figure (NF) of 3.1 dB and gain of 10.6 dB were achieved along with high linearity (IIP3) even upto 10.9 dBm at 3.1 GHz. With the bias network, the LNA had a total power consumption of 31 mW from 1.8 V supply.

  • 496.
    Persson, Stefan
    et al.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Isheden, Christian
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Jarmar, Tobias
    Uppsala University, Ångström Laboratory, Materials Science.
    Zhang, Shi-Li
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Lateral growth and three-dimensional effects in contacts between NiSi0.82Ge0.18 and p(+)-Si0.82Ge0.182005In: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 489, no 1-2, p. 159-163Article in journal (Refereed)
    Abstract [en]

    Electrical contacts of NiSi0.82Ge0.18 to P+-Si0.82Ge0.18 were fabricated and characterised. Lateral growth of the NiSi0.82Ge0.18 under SiO2 isolation was observed. A three-dimensional model was employed to extract the contact resistivity by considering both the lateral growth and the presence of a recessed NiSi0.82Ge0.18 step into the Si0.82Ge0.18. The contact resistivity extracted was 5.0 x 10(-8) and 1.4 x 10(-7) Omega cm(2) for small contacts of circular geometry and large contacts of square shape, respectively. Possible causes responsible for this 3-fold difference in contact resistivity were discussed. An underestimate of the contact resistivity by 35% was found if a two-dimensional model was used without taking into account the complex interface morphology.

  • 497. Petersson, P.
    et al.
    Jensen, J.
    Hallén, Anders
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Possnert, G.
    Measurement of hydrogen isotopes by a nuclear microprobe2008In: PROCEEDINGS OF THE 17TH INTERNATIONAL VACUUM CONGRESS/13TH INTERNATIONAL CONFERENCE ON SURFACE SCIENCE/INTERNATIONAL CONFERENCE ON NANOSCIENCE AND TECHNOLOGY, 2008, Vol. 100, no PART 6Conference paper (Refereed)
    Abstract [en]

    We here report mapping of hydrogen isotopes by elastic recoil detection analysis using heavy ions as projectiles at the Uppsala Tandem Laboratory nuclear microprobe. The system performance was evaluated by measurements on well defined samples of deuterium implanted vitreous carbon. Separation of hydrogen and deuterium as well as depth profiling was demonstrated by an appropriate choice of ion beams and recoil detection techniques. No effect was observed on the concentration profile of the implanted deuterium when a 7 MeV primary carbon ion beam was used. The hydrogen concentration near the sample surface was, however, significantly influenced by ion-induced detrapping.

  • 498. Petersson, Per
    et al.
    Bergsåker, Henric
    KTH, School of Electrical Engineering (EES), Fusion Plasma Physics. KTH, School of Electrical Engineering (EES), Centres, Alfvén Laboratory Centre for Space and Fusion Plasma Physics.
    Hallén, Anders
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Jensen, Jens
    Possnert, Göran
    Mapping of hydrogen isotopes with a scanning nuclear microprobe2008In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, ISSN 0168-583X, E-ISSN 1872-9584, Vol. 266, no 10, p. 2429-2432Article in journal (Refereed)
    Abstract [en]

    Elastic recoil detection analysis using heavy ions with a scanning nuclear microprobe was applied to determine the content of hydrogen isotopes in carbon material facing fusion plasma in the JET fusion reactor. The hydrogen and deuterium concentrations in re-deposited material were obtained by mapping a cross sectional cut of a wall sample. De-trapping and hydrogen release caused by the primary ion beam were investigated. For both the deuterium and hydrogen concentration a drop of similar to 75% was observed from an extrapolated initial value to a final steady state region. A procedure was used to determine the initial concentration. In this way a mapping of the initial deuterium concentration could be obtained.

  • 499. Pfrommer, H.
    et al.
    Piqueras, M. A.
    Herrera, J.
    Polo, V.
    Martinez, A.
    Karlsson, Stefan
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Kjebon, Olle
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Schatz, Richard
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Enard, A.
    Van Dijk, F.
    Yu, Yichuan
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Tsegaye, Tedros
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Liu, C. P.
    Chuang, C. H.
    Marti, J.
    Seeds, A. J.
    Experimental Demonstration of Full-Duplex DOCSIS Signal Transmissions over a Wireline/Wireless-Fibre Access Network2006In: 2006 International Topical Meeting on Microwaves Photonics, 2006, p. 89-92Conference paper (Refereed)
    Abstract [en]

    A fibre-radio access network architecture for simultaneous wireline and wireless transmissions of data over cable service interface specification (DOCSIS) signals is presented. An all-optical harmonic up-conversion technique using a dual-drive Mach-Zehnder modulator (DD-MZM) is employed at the central station while an InGaAsP/InGaAsP multiple quantum well (MQW) asymmetric Fabry-Perot modulator/detector (AFPM) functions as a single optical/electrical transducer performing optical intensity modulation and photodetection simultaneously at the base station. Full-duplex operation is demonstrated for both access types in an indoor laboratory environment as well as in a small-scale outdoor field trial

  • 500. Pohl, S.
    et al.
    Brade, Dirk
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Representing results of V&V-activities in fuzzy decision analysis value trees2005In: European Simulation Interoperability Workshop 2005, 2005, p. 74-87Conference paper (Refereed)
    Abstract [en]

    The process of accrediting a model can roughly be divided into first gathering and evaluating results of conducted V&V activities, and then aggregating these results into a total value: The accreditation decision. Especially the second part is not trivial, because results of V&V activities are quite manifold and at first sight not comparable with each other. Consider for example the evaluation of subject matter expert statements in contrast to real numbers as an outcome of statistical tests. Classical decision analysis, especially value tree analysis, has been implemented to support the accreditation decision by using a structured, scientifically justified approach. However, traditional value tree analysis is not flawless and exhibits deficiencies, as there are for example: The impossibility to distinguish between compensatory resp. non compensatory attribute values, the impossibility to not only quantify the knowledge about a model, but also the ignorance ("How much is known to be not known about the model?"), and the insufficient flexibility of using real or natural numbers to represent subject matter expert statements. In a previous paper (05S-SIW-042) the usage of Fuzzy Multi Attribute Decision Making, a branch of Decision Analysis incorporating Fuzzy Set Theory, was proposed in order to overcome the above mentioned deficiencies. Also a list of tasks was depicted, what needs to be done to enrich traditional value tree analysis by fuzzy set theoretic concepts. The very first task is the design of the attribute values, i. e. how leaves of a fuzzy value tree allegorizing results of conducted V&V activities look like, and this is the substance of this paper: The design of attribute values in a fuzzy value tree analysis in order to support the accreditation decision. The focal point is the representation of subject matter expert statements not by real or natural numbers as in traditional value tree analysis, but by fuzzy sets. After a short recapitulation of fuzzy set theory basics, the different designs to model value functions with the help of fuzzy sets are depicted. Advantages and disadvantages of each design are enumerated, and finally one specific concept, regarding the particularities of modeling the results of V&V activities, and the deficiencies of traditional value tree analysis mentioned above, is put forward.

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