| 1. |
- Bauer, K., et al.
(författare)
-
Welcome message from the PADE chairs
- 2013
-
Ingår i: Welcome message from the PADE chairs (Editorial). - : IEEE Computer Society. - 9781479905379 ; , s. lxi-lxii
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)
|
|
| 2. |
- Greenhalgh, Emile S., et al.
(författare)
-
Mechanical, electrical and microstructural characterisation of multifunctional structural power composites
- 2015
-
Ingår i: Journal of composite materials. - : Sage Publications. - 0021-9983 .- 1530-793X. ; 49:15, s. 1823-1834
-
Tidskriftsartikel (refereegranskat)abstract
- Multifunctional composites which can fulfil more than one role within a system have attracted considerable interest. This work focusses on structural supercapacitors which simultaneously carry mechanical load whilst storing/delivering electrical energy. Critical mechanical properties (in-plane shear and in-plane compression performance) of two monofunctional and four multifunctional materials were characterised, which gave an insight into the relationships between these properties, the microstructures and fracture processes. The reinforcements included baseline T300 fabric, which was then either grafted or sized with carbon nanotubes, whilst the baseline matrix was MTM57, which was blended with ionic liquid and lithium salt (two concentrations) to imbue multifunctionality. The resulting composites exhibited a high degree of matrix heterogeneity, with the ionic liquid phase preferentially forming at the fibres, resulting in poor matrix-dominated properties. However, fibre-dominated properties were not depressed. Thus, it was demonstrated that these materials can now offer weight savings over conventional monofunctional systems when under modest loading.
|
|
| 3. |
- Hui, I. S. B., et al.
(författare)
-
Biocomposites containing poly(lactic acid) and chitosan for 3D printing - Assessment of mechanical, antibacterial and in vitro biodegradability properties
- 2023
-
Ingår i: Journal of the Mechanical Behavior of Biomedical Materials. - : Elsevier Ltd. - 1751-6161 .- 1878-0180. ; 147
-
Tidskriftsartikel (refereegranskat)abstract
- New bone repair materials are needed for treatment of trauma-and disease-related skeletal defects as they still represent a major challenge in clinical practice. Additionally, new strategies are required to combat orthopedic device-related infections (ODRI), given the rising incidence of total joint replacement and fracture fixation surgeries in increasingly elderly populations. Recently, the convergence of additive manufacturing (AM) and bone tissue engineering (BTE) has facilitated the development of bone healthcare to achieve personalized three-dimensional (3D) scaffolds. This study focused on the development of a 3D printable bone repair material, based on the biopolymers poly(lactic acid) (PLA) and chitosan. Two different types of PLA and chitosan differing in their molecular weight (MW) were explored. The novel feature of this research was the successful 3D printing using biocomposite filaments composed of PLA and 10 wt% chitosan, with clear chitosan entrapment within the PLA matrix confirmed by Scanning Electron Microscopy (SEM) images. Tensile testing of injection molded samples indicated an increase in stiffness, compared to pure PLA scaffolds, suggesting potential for improved load-bearing characteristics in bone scaffolds. However, the potential benefit of chitosan on the biocomposite stiffness could not be reproduced in compression testing of 3D printed cylinders. The antibacterial assays confirmed antibacterial activity of chitosan when dissolved in acetic acid. The study also verified the biodegradability of the scaffolds, with a process producing an acidic environment that could potentially be neutralized by chitosan. In conclusion, the study indicated the feasibility of the proposed PLA/chitosan biocomposite for 3D printing, demonstrating adequate mechanical strength, antibacterial properties and biodegradability, which could serve as a new material for bone repair.
|
|
| 4. |
- Jämthagen, Christopher, et al.
(författare)
-
eavesROP: Listening for ROP Payloads in Data Streams
- 2014
-
Ingår i: Information Security/Lecture Notes in Computer Science. - Cham : Springer International Publishing. - 0302-9743. - 9783319132563 - 9783319132570 ; 8783, s. 413-424
-
Konferensbidrag (refereegranskat)abstract
- We consider the problem of detecting exploits based on return-oriented programming. In contrast to previous works we investigate to which extent we can detect ROP payloads by only analysing streaming data, i.e., we do not assume any modifications to the target machine, its kernel or its libraries. Neither do we attempt to execute any potentially malicious code in order to determine if it is an attack. While such a scenario has its limitations, we show that using a layered approach with a filtering mechanism together with the Fast Fourier Transform, it is possible to detect ROP payloads even in the presence of noise and assuming that the target system employs ASLR. Our approach, denoted eavesROP, thus provides a very lightweight and easily deployable mitigation against certain ROP attacks. It also provides the added merit of detecting the presence of a brute-force attack on ASLR since library base addresses are not assumed to be known by eavesROP.
|
|
| 5. |
- Lee, Sang Hwui, et al.
(författare)
-
Fine keyed alignment and bonding for wafer-level 3D ICs
- 2006
-
Ingår i: MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS. - WARRENDALE, PA : MATERIALS RESEARCH SOCIETY. ; , s. 433-438
-
Konferensbidrag (refereegranskat)abstract
- Precise wafer-to-wafer alignment accuracy is crucial to interconnecting circuits on different wafers in three dimensional integrated circuits. We discuss the use of fabricated structures on wafer surfaces to mechanically achieve higher alignment accuracy than can be achieved with our existing (baseline) alignment protocol. The keyed alignment structures rely on structures with tapered side-walls that can slide into each after two wafers are "pre-aligned" using our baseline alignment protocol. Results indicate that alignment accuracy is about a quarter micron, well below the one micron alignment accuracy obtained in our baseline alignment procedure using commercial state-of-the-art wafer alignment equipment. In addition to improving alignment, the alignment structures also hinder undesirable bonding-induced misalignment. The keyed alignment structures are also promising for nano-imprint lithography.
|
|
| 6. |
- Lui, Hoi-Shun, 1980, et al.
(författare)
-
A Note on the Mutual-Coupling Problems in Transmitting and Receiving Antenna Arrays
- 2009
-
Ingår i: IEEE Antennas and Propagation Magazine. - 1045-9243. ; 51:5, s. 171-176
-
Tidskriftsartikel (refereegranskat)abstract
- In antenna arrays, mutual coupling between antenna elements is well known as an undesired effect, which degrades the performance of array signal-processing algorithms. The compensation of such an undesired effect has been a popular research topic throughout the years. Various approaches for mutual-coupling compensation have been developed, and they can easily be found in the open literature. In general, the mutual-coupling problems for a transmitting and receiving array are different, even if the physical geometry of the array remains unchanged. However, it seems that antenna engineers are not well aware of such differences in the analysis of receiving antenna arrays. In this note, the mutual-coupling problems in transmitting and receiving antenna arrays are revisited. The differences between the mutual coupling and mutual impedances for transmitting and receiving antenna arrays are explained. It is concluded that the mutual-coupling problems of transmitting and receiving arrays are in general different, and hence different mutual impedances should be used for mutual-coupling analysis and compensation.
|
|
| 7. |
|
|
| 8. |
- Yu, Yantao, et al.
(författare)
-
Experimental study of DOA estimation using a compact monopole array
- 2010
-
Ingår i: 2010 IEEE International Symposium on Antennas and Propagation and CNC-USNC/URSI Radio Science Meeting - Leading the Wave, AP-S/URSI 2010; Toronto, ON; 11 July 2010 through 17 July 2010. - 9781424449682
-
Konferensbidrag (refereegranskat)abstract
- Space-time techniques like MIMO, diversity reception and direction finding all require multiport antenna arrays. In mobile applications, the size-limited platforms demand compact arrays with element spacing significantly smaller than λ/2. The small element spacing introduces strong mutual coupling between the elements of such compact arrays. For application of direction-of-arrival (DOA) estimation using typical DOA estimation algorithms, for example MUSIC [1], the mutual coupling effect between antenna elements significantly contributes to the estimation error. Many compensation methods have been proposed in previous studies [2] -[3]. The most commonly used one is the conventional mutual impedance method (CMIM) proposed in [4] . Recently, a modified concept of mutual impedance in receiving antenna arrays, the receiving mutual impedance, was proposed in [5]. This method is called the receiving mutual impedance method (RMIM). Theoretical studies have shown that much higher accuracies for DOA estimations can be achieved when the mutual coupling in receiving arrays are characterized using the RMIM than the CMIM. The current study is to provide experimental evidence on this. In this paper, a seven-element monopole array with element spacing of 0.2λ was used in the experiments. Both the receiving mutual impedances and the conventional mutual impedances of the array were measured. A series DOA experiments were then performed with one and two signal sources generated by transmitting antennas inside the anechoic chamber. © 2010 IEEE.
|
|
| 9. |
- Bartoletti, Stefania, et al.
(författare)
-
Positioning methods
- 2024
-
Ingår i: Positioning and Location-based Analytics in 5G and Beyond. - 9781119911463 ; , s. 21-50
-
Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- This chapter introduces the main positioning methods, starting from the state-of-the-art and following a statistical estimation perspective. This is followed by an in-depth treatment of radio positioning, first focusing on device-based positioning and then on device-free positioning. Finally, recent approaches based on artificial intelligence methods for positioning are detailed.
|
|
| 10. |
- Lagerspetz, E., et al.
(författare)
-
Pervasive Communities in the Internet of People
- 2018
-
Ingår i: 2018 IEEE International Conference on Pervasive Computing and Communications Workshops, PerCom Workshops 2018. - : Institute of Electrical and Electronics Engineers Inc.. - 9781538632277 ; , s. 40-45
-
Konferensbidrag (refereegranskat)abstract
- The Internet has traditionally been a device-oriented architecture where devices with IP addresses are first-class citizens, able to serve and consume content or services, and their owners take part in the interaction only through those devices. The Internet of People (IoP) is a recent paradigm where devices become proxies of their users, and can act on their behalf. To realize IoP, new policies and rules for how devices can take actions are required. The role of context information grows as devices act autonomously based on the environment and existing social relationships between their owners. In addition, the social profiles of device owners determine e.g. how altruistic or resourceconserving they are in collaborative computing scenarios. In this paper we focus on community formation in IoP, a prerequisite for enabling collaborative scenarios, and discuss main challenges and propose potential solutions. © 2018 IEEE.
|
|
