| 1. |
- Sudow, Mattias, 1980, et al.
(författare)
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SiC varactors for dynamic load modulation of high power amplifiers
- 2008
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Ingår i: IEEE Electron Device Letters. - 0741-3106 .- 1558-0563. ; 29:7, s. 728-730
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Tidskriftsartikel (refereegranskat)abstract
- SiC Schottky diode varactors with a high breakdown voltage, a high tuning ratio, and a low series resistance have been designed and fabricated. These characteristics are particularly necessary for the dynamic load modulation of high power amplifiers (PAs), which is an attractive alternative to other efficiency enhancement techniques. For a SiC Schottky diode varactor with a 50-µm radius fabricated by using a graded doping profile, a breakdown voltage of 40 V, a tuning range of 5.6, and a series resistance of 0.9 O were achieved. The results show the great potential of this type of varactors for the use in the dynamic load modulation of high power amplifiers. © 2008 IEEE.
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| 2. |
- Aidanpää, Jan-Olov, et al.
(författare)
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Developments in rotor dynamical modeling of hydropower units
- 2009
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Ingår i: Proceedings of the IUTAM Symposium on Emerging Trends in Rotor Dynamics. - Dordrecht : Encyclopedia of Global Archaeology/Springer Verlag. - 9789400700192
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Konferensbidrag (refereegranskat)
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| 3. |
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| 4. |
- Gunnarsson, Mattias, 1969, et al.
(författare)
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Personality traits and their associations with substance use among adolescents
- 2008
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Ingår i: Personality and Individual Differences. - : Elsevier BV. - 0191-8869. ; 45:5, s. 356-360
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Tidskriftsartikel (refereegranskat)abstract
- The aim of this study was to investigate whether there is an association between personality traits and self-reported risk consumption of substances among adolescents. A further aim was to evaluate whether the personality questionnaire Health relevant Personality Inventory (HP5i) can be used in a population of adolescents. The study participants included 3419 male and female adolescents with a median age of 18years. The results showed that the respondents with risk consumption of substances had significantly higher levels of antagonism and impulsivity and lower levels of hedonic capacity, alexithymia and negative affectivity compared to those with no risk consumption of substances. The HP5 inventory could potentially be a valuable complementary instrument for investigating future health development among adolescents.
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| 5. |
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| 6. |
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| 7. |
- Gustavsson, Mattias, 1977
(författare)
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Information Quality Deficiencies in Manufacturing Planning and Control
- 2008
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Increased global sourcing and a trend towards the supply chain management perspective on manufacturing establish highly information-driven supply chains. Low levels of information quality deficiencies are an important requirement from decision-makers in manufacturing planning and control processes. This puts forward the need for mutual understanding and agreements about the required information quality levels as well as how to decrease deficiencies. However, the emphasis in manufacturing planning and control research has been on consequences, not causes, of information quality deficiencies. This thesis focuses on the quality of forecast and customer order information in the manufacturing planning and control processes, and the purpose is to explain both causes and consequences of such deficiencies. For this purpose three case studies have been conducted and followed by a large-scale survey. The results are presented in six appended papers. Empirical data from the case studies have mainly been collected through interviews with staff working in, or in close relation to, the manufacturing planning and control processes. In the survey study, data were collected through a questionnaire answered in a web-interface. 840 valid companies received the web survey and 219 answers were received, corresponding to a response rate of 26%. The results from the case studies mainly describe information quality deficiencies in the specific case settings, while the results from the survey study primarily explains how such deficiencies are caused and what consequences they have. The identified causes of information quality deficiencies were the present integration level, information management practices, information characteristics and company characteristics. Information quality deficiencies were low in companies with well-developed information life cycle and process management. The main consequences of information quality deficiencies were articulated as corrective planning decisions. Information quality deficiencies were mainly correlated to corrective planning decisions in companies working with complex customer products and in companies with responsive process requirements. In the discussion, an information quality management process is developed, based on the results, in order to clarify their managerial implications.
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| 8. |
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| 9. |
- Gustavsson, Mattias, 1977
(författare)
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Information Quality Measurement
- 2006
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Ingår i: Proceedings of the 11th International Conference on Information Quality. - 1544-1342.
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Konferensbidrag (refereegranskat)
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| 10. |
- Gustavsson, Mattias, 1977, et al.
(författare)
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Perceived quality deficiencies of demand information and their consequences
- 2008
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Ingår i: International Journal of Logistics: Research and Applications. ; 11:4, s. 295-312
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Tidskriftsartikel (refereegranskat)abstract
- This paper focuses on the quality of demand information exchanged between customers and suppliers in supply chains. The first sub-purpose of the study is to describe the level and consequences of informationqualitydeficiencies of order and forecast information received by suppliers from their main customer. The second sub-purpose is to describe and compare the characteristics of companies and information with high and low information quality. The paper is based on a survey of Swedish manufacturing industry with 219 respondents. The results indicate that forecasts are considered deficient in terms of reliability, conciseness, timeliness and credibility while orders are considered deficient in terms of reliability. Further, companies with high levels of information-quality deficiencies were characterised by less active information management, and used less advanced planning software.
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