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- Andersson, Kent, et al.
(författare)
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A review of materials for spectral design coatings in signature management applications
- 2014
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Ingår i: Optics and Photonics for Counterterrorism, Crime Fighting, and Defence X; and Optical Materials and Biomaterials in Security and Defence Systems Technology XI (vol. 9253). - : SPIE - International Society for Optical Engineering. - 9781628413168
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Konferensbidrag (refereegranskat)abstract
- The current focus in Swedish policy towards national security and high-end technical systems, together with a rapid development in multispectral sensor technology, adds to the utility of developing advanced materials for spectral design in signature management applications. A literature study was performed probing research databases for advancements. Qualitative text analysis was performed using a six-indicator instrument: spectrally selective reflectance; low gloss; low degree of polarization; low infrared emissivity; non-destructive properties in radar and in general controllability of optical properties. Trends are identified and the most interesting materials and coating designs are presented with relevant performance metrics. They are sorted into categories in the order of increasing complexity: pigments and paints, one-dimensional structures, multidimensional structures (including photonic crystals), and lastly biomimic and metamaterials. The military utility of the coatings is assessed qualitatively. The need for developing a framework for assessing the military utility of incrementally increasing the performance of spectrally selective coatings is identified.
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- Andersson, Kent
(författare)
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Preparation and Characterisation of Sputtered Titanium- and Zirconium Nitride Optical Films
- 1993
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Multilayered interference coatings based on titanium- and zirconium nitride and designed for solar control have been prepared using reactive d c magnetron sputtering. Preparation effects and degradation mechanisms were investigated. It was shown that the quality of the nitride strongly depends on the degree of crystallinity in the underlying oxide. It has been shown that the nitride layer partly oxidizes as the top oxide layer is deposited. The degradation is enhanced with temperature. A thin sacrificial layer of aluminium deposited between successive depositions of nitride and oxide is shown to improve the optical performance of the coating as preparedm as well as after accelerated ageing tests.The optical properties of opaque and semitransparent films of zirconium nitride have been studied. A thorough investigation of the influence of composition, deposition rate, substrate temperature and film thickness on the optical response of the film was performed. Both photometric and ellipsometric methods were used to determine thicknesses and the optical constants at wavelengths ranging from 0.23 to 25 μm. The resulting values of n and k, in the wavelength intervals where these independent methods are applicable, have been shown to agree extremely well. The results so far indicate an even larger potential for zirconium nitride based solar control coatings as compared to the titanium nitride based.Access to optical constants derived from films of zirconium nitride of variable quality made multilayer modelling a powerful tool in the design and analysis of solar control coatings.
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- Bengtsson, Johnny, et al.
(författare)
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The Manifestation of Chinese Strategies Into Offensive Cyberspace Operations Targeting Sweden
- 2021
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Ingår i: Proceedings of the 20th European Conference on Cyber Warfare and Security. - Reading, UK : Academic Conferences International Limited. - 9781912764990 ; , s. 35-43
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Konferensbidrag (refereegranskat)abstract
- The aim of this article is to present how Chinese strategies are manifested into offensive cyberspace operations targeting Sweden. It is commonly known that People’s Republic of China (PRC, and in this definition the meaning of thegovernment and its military), uses five-year plans (FYP) for social and economic steering strategy of their country. This has been going on since 1953 until today. In 2015, the national strategic plan Made in China 2025 (中国制造2025) was launched by Le Keqiang, the Premier of the State Council of PRC. The main goal with this plan is to strengthen the economic development. In addition, Chinese military strategists noted the importance of information warfare and intelligence during military operations. This article is based on open sources: the official English translated version of the 13th Five-year plan (FYP) and other reporting on cyberspace operations linked to the PRC. A number of cases are presented to highlight the link between the PRC FYP and their targets. Next, the current situation in Sweden is presented and how the country is targeted by PRC-linked activities, both in and through cyberspace, but also military infiltration on academia. The results show that Sweden has been, and is continuously the target of offensive cyberspace operations. In parallel, the country is also the target of military infiltration on the academia, and direct investment strategies such as Huawei attempting to compete for the 5G frequency actions arranged by the Swedish Post and Telecom Authority. In conclusion, Sweden will continue to experience cyberespionage from PRC on all levels and on all domains; science, technology, IP and privacy information theft. Previously unveiled cyberspace operations cases in this article have proven to be a convenient strategy for the PRC to reduce its research and development gap in several ways; innovatively, financially and to shortening the time-to-market (TTM).
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- Berggren, Peter, et al.
(författare)
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Assessing team focused behaviors in emergency response teams using the shared priorities measure
- 2014
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Ingår i: Proceedings of the 11th International ISCRAM Conference. - Pennsylvania, USA : ISCRAM. ; , s. 130-134, s. 130-134
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Konferensbidrag (refereegranskat)abstract
- The purpose of this work in progress paper is to report on the method development of the Shared Prioritiesmeasure to include content analysis, as a way of gaining a deeper understanding of team work incrisis/emergency response. An experiment is reported where the performance of six trained teams is comparedwith the performance of six non-trained teams. The experiment was performed using an emergency responsemicroworld simulation with a forest fire scenario. Dependent measures were simulation performance, the CrewAwareness Rating Scale (CARS), and content analysis. Trained teams performed better and scored higher onmeasures of team behaviors.
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| 7. |
- Berglund, Martin, 1985-, et al.
(författare)
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Manufacturing Miniature Langmuir probes by Fusing Platinum Bond Wires
- 2015
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Ingår i: Journal of Micromechanics and Microengineering. - Bristol : Institute of Physics Publishing (IOPP). - 0960-1317 .- 1361-6439. ; 25:10
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Tidskriftsartikel (refereegranskat)abstract
- This paper reports on a novel method for manufacturing microscopic Langmuir probes with spherical tips from platinum bond wires by fusing for plasma characterization in microplasma sources. Here, the resulting endpoints, formed by droplets on the ends of a fused wire, are intended to act as spherical Langmuir probes. For studying the fusing behavior, bond wires were wedge bonded over a 2 mm wide slit, to emulate the final application, and fused with different voltages and currents. For electrical isolation, a set of wires were coated with a 4 μm thick layer of Parylene before they were fused. After fusing, the gap size, as well as the shape and area of the ends of the remaining stubs were measured. The yield of the process was also investigated, and the fusing event was studied using a high-speed camera for analyzing its dynamics. Four characteristic tip shapes were observed: spherical, folded, serpentine shaped and semi-spherical. The stub length leveled out at ~400 μm as the fusing power increased. The fusing of the coated wires required a higher power to yield a spherical shape. Finally, a Parylene coated bond wire was integrated into a stripline split-ring resonator (SSRR) microplasma source, and was fused to form two Langmuir probes with spherical endpoints. These probes were used for measuring the I–V characteristics of a plasma generated by the SSRR. In a voltage range between −60 V and 60 V, the fused stubs exhibited the expected behavior of spherical Langmuir probes, and will be considered for further integration.
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- Boschetti, Nicolò, et al.
(författare)
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A Hybrid Space Architecture for Robust and Resilient Satellite Services
- 2023
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Ingår i: 2023 IEEE International Conference on Space Mission Challenges for Information Technology (SMC-IT). - : Institute of Electrical and Electronics Engineers (IEEE). - 9798350341386 - 9798350341379 ; , s. 114-122
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Konferensbidrag (refereegranskat)abstract
- A 'hybrid space architecture' has been proposed to facilitate robust and resilient satellite data downlink, integration and analysis; however, the technical details for what may comprise a hybrid space architecture are severely lacking. Thus far, 'hybrid' principally entails the diversity of commercial providers. While diverse suppliers can contribute to hybrid space architectures, we argue that robustness and resilience will only be achieved through heterogeneous network and asset architectures. A connected satellite services ecosystem composed of the union of different networks with different characteristics would limit single points of failure, thereby generating high levels of redundancy, resilience and scalability. This research outlines parameters of a hybrid space architecture, documents satellite service reference architectures and provides a comparative analysis of the features for each architecture. Further, through a case study of existing satellite service providers, we propose how a hybrid space architecture could be piloted in Northern Europe and the High North.
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| 10. |
- Boschetti, Nicolò, et al.
(författare)
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Commercial Space Risk Framework Assessing the Satellite Ground Station Security Landscape for NATO in the Arctic and High North
- 2022
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Ingår i: 40th IEEE Military Communications Conference, Rockville, MD, USA, November 28 - December 2, 2022.. - : IEEE. - 9781665485357 - 9781665485340 ; , s. 679-686
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Konferensbidrag (refereegranskat)abstract
- Satellite ground stations in the Arctic and High North are of strategic importance to NATO, given their ability to collect intelligence from space assets in polar Earth orbit. Commercial space infrastructure such as ground systems are increasingly dual-use, employed for both civilian and defense purposes. Their dual-use could cause them to become military targets. As such, commercial operators must strategically consider ground station placement to optimize for utility, while accounting for their security risk. This research presents a frame-work to assess the commercial satellite ground station security landscape by outlining security and performance tradeoffs given geographic location, including proximity to potential adversaries, and designates eight separate risk regions. Particularly, Sweden's and Finland's space infrastructure is of focus given their recent application to join NATO in the wake of Russian aggression. The paper concludes that, to secure ground stations and the assets and services that they enable, a comprehensive risk evaluation including positioning of ground stations is critical.
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